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linux/drivers/net/cassini.c
Patrick McHardy 5b54814022 net: use symbolic values for ndo_start_xmit() return codes 
Convert magic values 1 and -1 to NETDEV_TX_BUSY and NETDEV_TX_LOCKED respectively.

0 (NETDEV_TX_OK) is not changed to keep the noise down, except in very few cases
where its in direct proximity to one of the other values.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-13 01:18:50 -07:00

5376 lines
142 KiB
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/* cassini.c: Sun Microsystems Cassini(+) ethernet driver.
*
* Copyright (C) 2004 Sun Microsystems Inc.
* Copyright (C) 2003 Adrian Sun (asun@darksunrising.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* This driver uses the sungem driver (c) David Miller
* (davem@redhat.com) as its basis.
*
* The cassini chip has a number of features that distinguish it from
* the gem chip:
* 4 transmit descriptor rings that are used for either QoS (VLAN) or
* load balancing (non-VLAN mode)
* batching of multiple packets
* multiple CPU dispatching
* page-based RX descriptor engine with separate completion rings
* Gigabit support (GMII and PCS interface)
* MIF link up/down detection works
*
* RX is handled by page sized buffers that are attached as fragments to
* the skb. here's what's done:
* -- driver allocates pages at a time and keeps reference counts
* on them.
* -- the upper protocol layers assume that the header is in the skb
* itself. as a result, cassini will copy a small amount (64 bytes)
* to make them happy.
* -- driver appends the rest of the data pages as frags to skbuffs
* and increments the reference count
* -- on page reclamation, the driver swaps the page with a spare page.
* if that page is still in use, it frees its reference to that page,
* and allocates a new page for use. otherwise, it just recycles the
* the page.
*
* NOTE: cassini can parse the header. however, it's not worth it
* as long as the network stack requires a header copy.
*
* TX has 4 queues. currently these queues are used in a round-robin
* fashion for load balancing. They can also be used for QoS. for that
* to work, however, QoS information needs to be exposed down to the driver
* level so that subqueues get targetted to particular transmit rings.
* alternatively, the queues can be configured via use of the all-purpose
* ioctl.
*
* RX DATA: the rx completion ring has all the info, but the rx desc
* ring has all of the data. RX can conceivably come in under multiple
* interrupts, but the INT# assignment needs to be set up properly by
* the BIOS and conveyed to the driver. PCI BIOSes don't know how to do
* that. also, the two descriptor rings are designed to distinguish between
* encrypted and non-encrypted packets, but we use them for buffering
* instead.
*
* by default, the selective clear mask is set up to process rx packets.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/list.h>
#include <linux/dma-mapping.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/random.h>
#include <linux/mii.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/mutex.h>
#include <linux/firmware.h>
#include <net/checksum.h>
#include <asm/atomic.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#define cas_page_map(x) kmap_atomic((x), KM_SKB_DATA_SOFTIRQ)
#define cas_page_unmap(x) kunmap_atomic((x), KM_SKB_DATA_SOFTIRQ)
#define CAS_NCPUS num_online_cpus()
#if defined(CONFIG_CASSINI_NAPI) && defined(HAVE_NETDEV_POLL)
#define USE_NAPI
#define cas_skb_release(x) netif_receive_skb(x)
#else
#define cas_skb_release(x) netif_rx(x)
#endif
/* select which firmware to use */
#define USE_HP_WORKAROUND
#define HP_WORKAROUND_DEFAULT /* select which firmware to use as default */
#define CAS_HP_ALT_FIRMWARE cas_prog_null /* alternate firmware */
#include "cassini.h"
#define USE_TX_COMPWB /* use completion writeback registers */
#define USE_CSMA_CD_PROTO /* standard CSMA/CD */
#define USE_RX_BLANK /* hw interrupt mitigation */
#undef USE_ENTROPY_DEV /* don't test for entropy device */
/* NOTE: these aren't useable unless PCI interrupts can be assigned.
* also, we need to make cp->lock finer-grained.
*/
#undef USE_PCI_INTB
#undef USE_PCI_INTC
#undef USE_PCI_INTD
#undef USE_QOS
#undef USE_VPD_DEBUG /* debug vpd information if defined */
/* rx processing options */
#define USE_PAGE_ORDER /* specify to allocate large rx pages */
#define RX_DONT_BATCH 0 /* if 1, don't batch flows */
#define RX_COPY_ALWAYS 0 /* if 0, use frags */
#define RX_COPY_MIN 64 /* copy a little to make upper layers happy */
#undef RX_COUNT_BUFFERS /* define to calculate RX buffer stats */
#define DRV_MODULE_NAME "cassini"
#define PFX DRV_MODULE_NAME ": "
#define DRV_MODULE_VERSION "1.6"
#define DRV_MODULE_RELDATE "21 May 2008"
#define CAS_DEF_MSG_ENABLE \
(NETIF_MSG_DRV | \
NETIF_MSG_PROBE | \
NETIF_MSG_LINK | \
NETIF_MSG_TIMER | \
NETIF_MSG_IFDOWN | \
NETIF_MSG_IFUP | \
NETIF_MSG_RX_ERR | \
NETIF_MSG_TX_ERR)
/* length of time before we decide the hardware is borked,
* and dev->tx_timeout() should be called to fix the problem
*/
#define CAS_TX_TIMEOUT (HZ)
#define CAS_LINK_TIMEOUT (22*HZ/10)
#define CAS_LINK_FAST_TIMEOUT (1)
/* timeout values for state changing. these specify the number
* of 10us delays to be used before giving up.
*/
#define STOP_TRIES_PHY 1000
#define STOP_TRIES 5000
/* specify a minimum frame size to deal with some fifo issues
* max mtu == 2 * page size - ethernet header - 64 - swivel =
* 2 * page_size - 0x50
*/
#define CAS_MIN_FRAME 97
#define CAS_1000MB_MIN_FRAME 255
#define CAS_MIN_MTU 60
#define CAS_MAX_MTU min(((cp->page_size << 1) - 0x50), 9000)
#if 1
/*
* Eliminate these and use separate atomic counters for each, to
* avoid a race condition.
*/
#else
#define CAS_RESET_MTU 1
#define CAS_RESET_ALL 2
#define CAS_RESET_SPARE 3
#endif
static char version[] __devinitdata =
DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
static int cassini_debug = -1; /* -1 == use CAS_DEF_MSG_ENABLE as value */
static int link_mode;
MODULE_AUTHOR("Adrian Sun (asun@darksunrising.com)");
MODULE_DESCRIPTION("Sun Cassini(+) ethernet driver");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("sun/cassini.bin");
module_param(cassini_debug, int, 0);
MODULE_PARM_DESC(cassini_debug, "Cassini bitmapped debugging message enable value");
module_param(link_mode, int, 0);
MODULE_PARM_DESC(link_mode, "default link mode");
/*
* Work around for a PCS bug in which the link goes down due to the chip
* being confused and never showing a link status of "up."
*/
#define DEFAULT_LINKDOWN_TIMEOUT 5
/*
* Value in seconds, for user input.
*/
static int linkdown_timeout = DEFAULT_LINKDOWN_TIMEOUT;
module_param(linkdown_timeout, int, 0);
MODULE_PARM_DESC(linkdown_timeout,
"min reset interval in sec. for PCS linkdown issue; disabled if not positive");
/*
* value in 'ticks' (units used by jiffies). Set when we init the
* module because 'HZ' in actually a function call on some flavors of
* Linux. This will default to DEFAULT_LINKDOWN_TIMEOUT * HZ.
*/
static int link_transition_timeout;
static u16 link_modes[] __devinitdata = {
BMCR_ANENABLE, /* 0 : autoneg */
0, /* 1 : 10bt half duplex */
BMCR_SPEED100, /* 2 : 100bt half duplex */
BMCR_FULLDPLX, /* 3 : 10bt full duplex */
BMCR_SPEED100|BMCR_FULLDPLX, /* 4 : 100bt full duplex */
CAS_BMCR_SPEED1000|BMCR_FULLDPLX /* 5 : 1000bt full duplex */
};
static struct pci_device_id cas_pci_tbl[] __devinitdata = {
{ PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_CASSINI,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SATURN,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, cas_pci_tbl);
static void cas_set_link_modes(struct cas *cp);
static inline void cas_lock_tx(struct cas *cp)
{
int i;
for (i = 0; i < N_TX_RINGS; i++)
spin_lock(&cp->tx_lock[i]);
}
static inline void cas_lock_all(struct cas *cp)
{
spin_lock_irq(&cp->lock);
cas_lock_tx(cp);
}
/* WTZ: QA was finding deadlock problems with the previous
* versions after long test runs with multiple cards per machine.
* See if replacing cas_lock_all with safer versions helps. The
* symptoms QA is reporting match those we'd expect if interrupts
* aren't being properly restored, and we fixed a previous deadlock
* with similar symptoms by using save/restore versions in other
* places.
*/
#define cas_lock_all_save(cp, flags) \
do { \
struct cas *xxxcp = (cp); \
spin_lock_irqsave(&xxxcp->lock, flags); \
cas_lock_tx(xxxcp); \
} while (0)
static inline void cas_unlock_tx(struct cas *cp)
{
int i;
for (i = N_TX_RINGS; i > 0; i--)
spin_unlock(&cp->tx_lock[i - 1]);
}
static inline void cas_unlock_all(struct cas *cp)
{
cas_unlock_tx(cp);
spin_unlock_irq(&cp->lock);
}
#define cas_unlock_all_restore(cp, flags) \
do { \
struct cas *xxxcp = (cp); \
cas_unlock_tx(xxxcp); \
spin_unlock_irqrestore(&xxxcp->lock, flags); \
} while (0)
static void cas_disable_irq(struct cas *cp, const int ring)
{
/* Make sure we won't get any more interrupts */
if (ring == 0) {
writel(0xFFFFFFFF, cp->regs + REG_INTR_MASK);
return;
}
/* disable completion interrupts and selectively mask */
if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
switch (ring) {
#if defined (USE_PCI_INTB) || defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
#ifdef USE_PCI_INTB
case 1:
#endif
#ifdef USE_PCI_INTC
case 2:
#endif
#ifdef USE_PCI_INTD
case 3:
#endif
writel(INTRN_MASK_CLEAR_ALL | INTRN_MASK_RX_EN,
cp->regs + REG_PLUS_INTRN_MASK(ring));
break;
#endif
default:
writel(INTRN_MASK_CLEAR_ALL, cp->regs +
REG_PLUS_INTRN_MASK(ring));
break;
}
}
}
static inline void cas_mask_intr(struct cas *cp)
{
int i;
for (i = 0; i < N_RX_COMP_RINGS; i++)
cas_disable_irq(cp, i);
}
static void cas_enable_irq(struct cas *cp, const int ring)
{
if (ring == 0) { /* all but TX_DONE */
writel(INTR_TX_DONE, cp->regs + REG_INTR_MASK);
return;
}
if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
switch (ring) {
#if defined (USE_PCI_INTB) || defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
#ifdef USE_PCI_INTB
case 1:
#endif
#ifdef USE_PCI_INTC
case 2:
#endif
#ifdef USE_PCI_INTD
case 3:
#endif
writel(INTRN_MASK_RX_EN, cp->regs +
REG_PLUS_INTRN_MASK(ring));
break;
#endif
default:
break;
}
}
}
static inline void cas_unmask_intr(struct cas *cp)
{
int i;
for (i = 0; i < N_RX_COMP_RINGS; i++)
cas_enable_irq(cp, i);
}
static inline void cas_entropy_gather(struct cas *cp)
{
#ifdef USE_ENTROPY_DEV
if ((cp->cas_flags & CAS_FLAG_ENTROPY_DEV) == 0)
return;
batch_entropy_store(readl(cp->regs + REG_ENTROPY_IV),
readl(cp->regs + REG_ENTROPY_IV),
sizeof(uint64_t)*8);
#endif
}
static inline void cas_entropy_reset(struct cas *cp)
{
#ifdef USE_ENTROPY_DEV
if ((cp->cas_flags & CAS_FLAG_ENTROPY_DEV) == 0)
return;
writel(BIM_LOCAL_DEV_PAD | BIM_LOCAL_DEV_PROM | BIM_LOCAL_DEV_EXT,
cp->regs + REG_BIM_LOCAL_DEV_EN);
writeb(ENTROPY_RESET_STC_MODE, cp->regs + REG_ENTROPY_RESET);
writeb(0x55, cp->regs + REG_ENTROPY_RAND_REG);
/* if we read back 0x0, we don't have an entropy device */
if (readb(cp->regs + REG_ENTROPY_RAND_REG) == 0)
cp->cas_flags &= ~CAS_FLAG_ENTROPY_DEV;
#endif
}
/* access to the phy. the following assumes that we've initialized the MIF to
* be in frame rather than bit-bang mode
*/
static u16 cas_phy_read(struct cas *cp, int reg)
{
u32 cmd;
int limit = STOP_TRIES_PHY;
cmd = MIF_FRAME_ST | MIF_FRAME_OP_READ;
cmd |= CAS_BASE(MIF_FRAME_PHY_ADDR, cp->phy_addr);
cmd |= CAS_BASE(MIF_FRAME_REG_ADDR, reg);
cmd |= MIF_FRAME_TURN_AROUND_MSB;
writel(cmd, cp->regs + REG_MIF_FRAME);
/* poll for completion */
while (limit-- > 0) {
udelay(10);
cmd = readl(cp->regs + REG_MIF_FRAME);
if (cmd & MIF_FRAME_TURN_AROUND_LSB)
return (cmd & MIF_FRAME_DATA_MASK);
}
return 0xFFFF; /* -1 */
}
static int cas_phy_write(struct cas *cp, int reg, u16 val)
{
int limit = STOP_TRIES_PHY;
u32 cmd;
cmd = MIF_FRAME_ST | MIF_FRAME_OP_WRITE;
cmd |= CAS_BASE(MIF_FRAME_PHY_ADDR, cp->phy_addr);
cmd |= CAS_BASE(MIF_FRAME_REG_ADDR, reg);
cmd |= MIF_FRAME_TURN_AROUND_MSB;
cmd |= val & MIF_FRAME_DATA_MASK;
writel(cmd, cp->regs + REG_MIF_FRAME);
/* poll for completion */
while (limit-- > 0) {
udelay(10);
cmd = readl(cp->regs + REG_MIF_FRAME);
if (cmd & MIF_FRAME_TURN_AROUND_LSB)
return 0;
}
return -1;
}
static void cas_phy_powerup(struct cas *cp)
{
u16 ctl = cas_phy_read(cp, MII_BMCR);
if ((ctl & BMCR_PDOWN) == 0)
return;
ctl &= ~BMCR_PDOWN;
cas_phy_write(cp, MII_BMCR, ctl);
}
static void cas_phy_powerdown(struct cas *cp)
{
u16 ctl = cas_phy_read(cp, MII_BMCR);
if (ctl & BMCR_PDOWN)
return;
ctl |= BMCR_PDOWN;
cas_phy_write(cp, MII_BMCR, ctl);
}
/* cp->lock held. note: the last put_page will free the buffer */
static int cas_page_free(struct cas *cp, cas_page_t *page)
{
pci_unmap_page(cp->pdev, page->dma_addr, cp->page_size,
PCI_DMA_FROMDEVICE);
__free_pages(page->buffer, cp->page_order);
kfree(page);
return 0;
}
#ifdef RX_COUNT_BUFFERS
#define RX_USED_ADD(x, y) ((x)->used += (y))
#define RX_USED_SET(x, y) ((x)->used = (y))
#else
#define RX_USED_ADD(x, y)
#define RX_USED_SET(x, y)
#endif
/* local page allocation routines for the receive buffers. jumbo pages
* require at least 8K contiguous and 8K aligned buffers.
*/
static cas_page_t *cas_page_alloc(struct cas *cp, const gfp_t flags)
{
cas_page_t *page;
page = kmalloc(sizeof(cas_page_t), flags);
if (!page)
return NULL;
INIT_LIST_HEAD(&page->list);
RX_USED_SET(page, 0);
page->buffer = alloc_pages(flags, cp->page_order);
if (!page->buffer)
goto page_err;
page->dma_addr = pci_map_page(cp->pdev, page->buffer, 0,
cp->page_size, PCI_DMA_FROMDEVICE);
return page;
page_err:
kfree(page);
return NULL;
}
/* initialize spare pool of rx buffers, but allocate during the open */
static void cas_spare_init(struct cas *cp)
{
spin_lock(&cp->rx_inuse_lock);
INIT_LIST_HEAD(&cp->rx_inuse_list);
spin_unlock(&cp->rx_inuse_lock);
spin_lock(&cp->rx_spare_lock);
INIT_LIST_HEAD(&cp->rx_spare_list);
cp->rx_spares_needed = RX_SPARE_COUNT;
spin_unlock(&cp->rx_spare_lock);
}
/* used on close. free all the spare buffers. */
static void cas_spare_free(struct cas *cp)
{
struct list_head list, *elem, *tmp;
/* free spare buffers */
INIT_LIST_HEAD(&list);
spin_lock(&cp->rx_spare_lock);
list_splice_init(&cp->rx_spare_list, &list);
spin_unlock(&cp->rx_spare_lock);
list_for_each_safe(elem, tmp, &list) {
cas_page_free(cp, list_entry(elem, cas_page_t, list));
}
INIT_LIST_HEAD(&list);
#if 1
/*
* Looks like Adrian had protected this with a different
* lock than used everywhere else to manipulate this list.
*/
spin_lock(&cp->rx_inuse_lock);
list_splice_init(&cp->rx_inuse_list, &list);
spin_unlock(&cp->rx_inuse_lock);
#else
spin_lock(&cp->rx_spare_lock);
list_splice_init(&cp->rx_inuse_list, &list);
spin_unlock(&cp->rx_spare_lock);
#endif
list_for_each_safe(elem, tmp, &list) {
cas_page_free(cp, list_entry(elem, cas_page_t, list));
}
}
/* replenish spares if needed */
static void cas_spare_recover(struct cas *cp, const gfp_t flags)
{
struct list_head list, *elem, *tmp;
int needed, i;
/* check inuse list. if we don't need any more free buffers,
* just free it
*/
/* make a local copy of the list */
INIT_LIST_HEAD(&list);
spin_lock(&cp->rx_inuse_lock);
list_splice_init(&cp->rx_inuse_list, &list);
spin_unlock(&cp->rx_inuse_lock);
list_for_each_safe(elem, tmp, &list) {
cas_page_t *page = list_entry(elem, cas_page_t, list);
/*
* With the lockless pagecache, cassini buffering scheme gets
* slightly less accurate: we might find that a page has an
* elevated reference count here, due to a speculative ref,
* and skip it as in-use. Ideally we would be able to reclaim
* it. However this would be such a rare case, it doesn't
* matter too much as we should pick it up the next time round.
*
* Importantly, if we find that the page has a refcount of 1
* here (our refcount), then we know it is definitely not inuse
* so we can reuse it.
*/
if (page_count(page->buffer) > 1)
continue;
list_del(elem);
spin_lock(&cp->rx_spare_lock);
if (cp->rx_spares_needed > 0) {
list_add(elem, &cp->rx_spare_list);
cp->rx_spares_needed--;
spin_unlock(&cp->rx_spare_lock);
} else {
spin_unlock(&cp->rx_spare_lock);
cas_page_free(cp, page);
}
}
/* put any inuse buffers back on the list */
if (!list_empty(&list)) {
spin_lock(&cp->rx_inuse_lock);
list_splice(&list, &cp->rx_inuse_list);
spin_unlock(&cp->rx_inuse_lock);
}
spin_lock(&cp->rx_spare_lock);
needed = cp->rx_spares_needed;
spin_unlock(&cp->rx_spare_lock);
if (!needed)
return;
/* we still need spares, so try to allocate some */
INIT_LIST_HEAD(&list);
i = 0;
while (i < needed) {
cas_page_t *spare = cas_page_alloc(cp, flags);
if (!spare)
break;
list_add(&spare->list, &list);
i++;
}
spin_lock(&cp->rx_spare_lock);
list_splice(&list, &cp->rx_spare_list);
cp->rx_spares_needed -= i;
spin_unlock(&cp->rx_spare_lock);
}
/* pull a page from the list. */
static cas_page_t *cas_page_dequeue(struct cas *cp)
{
struct list_head *entry;
int recover;
spin_lock(&cp->rx_spare_lock);
if (list_empty(&cp->rx_spare_list)) {
/* try to do a quick recovery */
spin_unlock(&cp->rx_spare_lock);
cas_spare_recover(cp, GFP_ATOMIC);
spin_lock(&cp->rx_spare_lock);
if (list_empty(&cp->rx_spare_list)) {
if (netif_msg_rx_err(cp))
printk(KERN_ERR "%s: no spare buffers "
"available.\n", cp->dev->name);
spin_unlock(&cp->rx_spare_lock);
return NULL;
}
}
entry = cp->rx_spare_list.next;
list_del(entry);
recover = ++cp->rx_spares_needed;
spin_unlock(&cp->rx_spare_lock);
/* trigger the timer to do the recovery */
if ((recover & (RX_SPARE_RECOVER_VAL - 1)) == 0) {
#if 1
atomic_inc(&cp->reset_task_pending);
atomic_inc(&cp->reset_task_pending_spare);
schedule_work(&cp->reset_task);
#else
atomic_set(&cp->reset_task_pending, CAS_RESET_SPARE);
schedule_work(&cp->reset_task);
#endif
}
return list_entry(entry, cas_page_t, list);
}
static void cas_mif_poll(struct cas *cp, const int enable)
{
u32 cfg;
cfg = readl(cp->regs + REG_MIF_CFG);
cfg &= (MIF_CFG_MDIO_0 | MIF_CFG_MDIO_1);
if (cp->phy_type & CAS_PHY_MII_MDIO1)
cfg |= MIF_CFG_PHY_SELECT;
/* poll and interrupt on link status change. */
if (enable) {
cfg |= MIF_CFG_POLL_EN;
cfg |= CAS_BASE(MIF_CFG_POLL_REG, MII_BMSR);
cfg |= CAS_BASE(MIF_CFG_POLL_PHY, cp->phy_addr);
}
writel((enable) ? ~(BMSR_LSTATUS | BMSR_ANEGCOMPLETE) : 0xFFFF,
cp->regs + REG_MIF_MASK);
writel(cfg, cp->regs + REG_MIF_CFG);
}
/* Must be invoked under cp->lock */
static void cas_begin_auto_negotiation(struct cas *cp, struct ethtool_cmd *ep)
{
u16 ctl;
#if 1
int lcntl;
int changed = 0;
int oldstate = cp->lstate;
int link_was_not_down = !(oldstate == link_down);
#endif
/* Setup link parameters */
if (!ep)
goto start_aneg;
lcntl = cp->link_cntl;
if (ep->autoneg == AUTONEG_ENABLE)
cp->link_cntl = BMCR_ANENABLE;
else {
cp->link_cntl = 0;
if (ep->speed == SPEED_100)
cp->link_cntl |= BMCR_SPEED100;
else if (ep->speed == SPEED_1000)
cp->link_cntl |= CAS_BMCR_SPEED1000;
if (ep->duplex == DUPLEX_FULL)
cp->link_cntl |= BMCR_FULLDPLX;
}
#if 1
changed = (lcntl != cp->link_cntl);
#endif
start_aneg:
if (cp->lstate == link_up) {
printk(KERN_INFO "%s: PCS link down.\n",
cp->dev->name);
} else {
if (changed) {
printk(KERN_INFO "%s: link configuration changed\n",
cp->dev->name);
}
}
cp->lstate = link_down;
cp->link_transition = LINK_TRANSITION_LINK_DOWN;
if (!cp->hw_running)
return;
#if 1
/*
* WTZ: If the old state was link_up, we turn off the carrier
* to replicate everything we do elsewhere on a link-down
* event when we were already in a link-up state..
*/
if (oldstate == link_up)
netif_carrier_off(cp->dev);
if (changed && link_was_not_down) {
/*
* WTZ: This branch will simply schedule a full reset after
* we explicitly changed link modes in an ioctl. See if this
* fixes the link-problems we were having for forced mode.
*/
atomic_inc(&cp->reset_task_pending);
atomic_inc(&cp->reset_task_pending_all);
schedule_work(&cp->reset_task);
cp->timer_ticks = 0;
mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
return;
}
#endif
if (cp->phy_type & CAS_PHY_SERDES) {
u32 val = readl(cp->regs + REG_PCS_MII_CTRL);
if (cp->link_cntl & BMCR_ANENABLE) {
val |= (PCS_MII_RESTART_AUTONEG | PCS_MII_AUTONEG_EN);
cp->lstate = link_aneg;
} else {
if (cp->link_cntl & BMCR_FULLDPLX)
val |= PCS_MII_CTRL_DUPLEX;
val &= ~PCS_MII_AUTONEG_EN;
cp->lstate = link_force_ok;
}
cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
writel(val, cp->regs + REG_PCS_MII_CTRL);
} else {
cas_mif_poll(cp, 0);
ctl = cas_phy_read(cp, MII_BMCR);
ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 |
CAS_BMCR_SPEED1000 | BMCR_ANENABLE);
ctl |= cp->link_cntl;
if (ctl & BMCR_ANENABLE) {
ctl |= BMCR_ANRESTART;
cp->lstate = link_aneg;
} else {
cp->lstate = link_force_ok;
}
cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
cas_phy_write(cp, MII_BMCR, ctl);
cas_mif_poll(cp, 1);
}
cp->timer_ticks = 0;
mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
}
/* Must be invoked under cp->lock. */
static int cas_reset_mii_phy(struct cas *cp)
{
int limit = STOP_TRIES_PHY;
u16 val;
cas_phy_write(cp, MII_BMCR, BMCR_RESET);
udelay(100);
while (--limit) {
val = cas_phy_read(cp, MII_BMCR);
if ((val & BMCR_RESET) == 0)
break;
udelay(10);
}
return (limit <= 0);
}
static int cas_saturn_firmware_init(struct cas *cp)
{
const struct firmware *fw;
const char fw_name[] = "sun/cassini.bin";
int err;
if (PHY_NS_DP83065 != cp->phy_id)
return 0;
err = request_firmware(&fw, fw_name, &cp->pdev->dev);
if (err) {
printk(KERN_ERR "cassini: Failed to load firmware \"%s\"\n",
fw_name);
return err;
}
if (fw->size < 2) {
printk(KERN_ERR "cassini: bogus length %zu in \"%s\"\n",
fw->size, fw_name);
err = -EINVAL;
goto out;
}
cp->fw_load_addr= fw->data[1] << 8 | fw->data[0];
cp->fw_size = fw->size - 2;
cp->fw_data = vmalloc(cp->fw_size);
if (!cp->fw_data) {
err = -ENOMEM;
printk(KERN_ERR "cassini: \"%s\" Failed %d\n", fw_name, err);
goto out;
}
memcpy(cp->fw_data, &fw->data[2], cp->fw_size);
out:
release_firmware(fw);
return err;
}
static void cas_saturn_firmware_load(struct cas *cp)
{
int i;
cas_phy_powerdown(cp);
/* expanded memory access mode */
cas_phy_write(cp, DP83065_MII_MEM, 0x0);
/* pointer configuration for new firmware */
cas_phy_write(cp, DP83065_MII_REGE, 0x8ff9);
cas_phy_write(cp, DP83065_MII_REGD, 0xbd);
cas_phy_write(cp, DP83065_MII_REGE, 0x8ffa);
cas_phy_write(cp, DP83065_MII_REGD, 0x82);
cas_phy_write(cp, DP83065_MII_REGE, 0x8ffb);
cas_phy_write(cp, DP83065_MII_REGD, 0x0);
cas_phy_write(cp, DP83065_MII_REGE, 0x8ffc);
cas_phy_write(cp, DP83065_MII_REGD, 0x39);
/* download new firmware */
cas_phy_write(cp, DP83065_MII_MEM, 0x1);
cas_phy_write(cp, DP83065_MII_REGE, cp->fw_load_addr);
for (i = 0; i < cp->fw_size; i++)
cas_phy_write(cp, DP83065_MII_REGD, cp->fw_data[i]);
/* enable firmware */
cas_phy_write(cp, DP83065_MII_REGE, 0x8ff8);
cas_phy_write(cp, DP83065_MII_REGD, 0x1);
}
/* phy initialization */
static void cas_phy_init(struct cas *cp)
{
u16 val;
/* if we're in MII/GMII mode, set up phy */
if (CAS_PHY_MII(cp->phy_type)) {
writel(PCS_DATAPATH_MODE_MII,
cp->regs + REG_PCS_DATAPATH_MODE);
cas_mif_poll(cp, 0);
cas_reset_mii_phy(cp); /* take out of isolate mode */
if (PHY_LUCENT_B0 == cp->phy_id) {
/* workaround link up/down issue with lucent */
cas_phy_write(cp, LUCENT_MII_REG, 0x8000);
cas_phy_write(cp, MII_BMCR, 0x00f1);
cas_phy_write(cp, LUCENT_MII_REG, 0x0);
} else if (PHY_BROADCOM_B0 == (cp->phy_id & 0xFFFFFFFC)) {
/* workarounds for broadcom phy */
cas_phy_write(cp, BROADCOM_MII_REG8, 0x0C20);
cas_phy_write(cp, BROADCOM_MII_REG7, 0x0012);
cas_phy_write(cp, BROADCOM_MII_REG5, 0x1804);
cas_phy_write(cp, BROADCOM_MII_REG7, 0x0013);
cas_phy_write(cp, BROADCOM_MII_REG5, 0x1204);
cas_phy_write(cp, BROADCOM_MII_REG7, 0x8006);
cas_phy_write(cp, BROADCOM_MII_REG5, 0x0132);
cas_phy_write(cp, BROADCOM_MII_REG7, 0x8006);
cas_phy_write(cp, BROADCOM_MII_REG5, 0x0232);
cas_phy_write(cp, BROADCOM_MII_REG7, 0x201F);
cas_phy_write(cp, BROADCOM_MII_REG5, 0x0A20);
} else if (PHY_BROADCOM_5411 == cp->phy_id) {
val = cas_phy_read(cp, BROADCOM_MII_REG4);
val = cas_phy_read(cp, BROADCOM_MII_REG4);
if (val & 0x0080) {
/* link workaround */
cas_phy_write(cp, BROADCOM_MII_REG4,
val & ~0x0080);
}
} else if (cp->cas_flags & CAS_FLAG_SATURN) {
writel((cp->phy_type & CAS_PHY_MII_MDIO0) ?
SATURN_PCFG_FSI : 0x0,
cp->regs + REG_SATURN_PCFG);
/* load firmware to address 10Mbps auto-negotiation
* issue. NOTE: this will need to be changed if the
* default firmware gets fixed.
*/
if (PHY_NS_DP83065 == cp->phy_id) {
cas_saturn_firmware_load(cp);
}
cas_phy_powerup(cp);
}
/* advertise capabilities */
val = cas_phy_read(cp, MII_BMCR);
val &= ~BMCR_ANENABLE;
cas_phy_write(cp, MII_BMCR, val);
udelay(10);
cas_phy_write(cp, MII_ADVERTISE,
cas_phy_read(cp, MII_ADVERTISE) |
(ADVERTISE_10HALF | ADVERTISE_10FULL |
ADVERTISE_100HALF | ADVERTISE_100FULL |
CAS_ADVERTISE_PAUSE |
CAS_ADVERTISE_ASYM_PAUSE));
if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
/* make sure that we don't advertise half
* duplex to avoid a chip issue
*/
val = cas_phy_read(cp, CAS_MII_1000_CTRL);
val &= ~CAS_ADVERTISE_1000HALF;
val |= CAS_ADVERTISE_1000FULL;
cas_phy_write(cp, CAS_MII_1000_CTRL, val);
}
} else {
/* reset pcs for serdes */
u32 val;
int limit;
writel(PCS_DATAPATH_MODE_SERDES,
cp->regs + REG_PCS_DATAPATH_MODE);
/* enable serdes pins on saturn */
if (cp->cas_flags & CAS_FLAG_SATURN)
writel(0, cp->regs + REG_SATURN_PCFG);
/* Reset PCS unit. */
val = readl(cp->regs + REG_PCS_MII_CTRL);
val |= PCS_MII_RESET;
writel(val, cp->regs + REG_PCS_MII_CTRL);
limit = STOP_TRIES;
while (--limit > 0) {
udelay(10);
if ((readl(cp->regs + REG_PCS_MII_CTRL) &
PCS_MII_RESET) == 0)
break;
}
if (limit <= 0)
printk(KERN_WARNING "%s: PCS reset bit would not "
"clear [%08x].\n", cp->dev->name,
readl(cp->regs + REG_PCS_STATE_MACHINE));
/* Make sure PCS is disabled while changing advertisement
* configuration.
*/
writel(0x0, cp->regs + REG_PCS_CFG);
/* Advertise all capabilities except half-duplex. */
val = readl(cp->regs + REG_PCS_MII_ADVERT);
val &= ~PCS_MII_ADVERT_HD;
val |= (PCS_MII_ADVERT_FD | PCS_MII_ADVERT_SYM_PAUSE |
PCS_MII_ADVERT_ASYM_PAUSE);
writel(val, cp->regs + REG_PCS_MII_ADVERT);
/* enable PCS */
writel(PCS_CFG_EN, cp->regs + REG_PCS_CFG);
/* pcs workaround: enable sync detect */
writel(PCS_SERDES_CTRL_SYNCD_EN,
cp->regs + REG_PCS_SERDES_CTRL);
}
}
static int cas_pcs_link_check(struct cas *cp)
{
u32 stat, state_machine;
int retval = 0;
/* The link status bit latches on zero, so you must
* read it twice in such a case to see a transition
* to the link being up.
*/
stat = readl(cp->regs + REG_PCS_MII_STATUS);
if ((stat & PCS_MII_STATUS_LINK_STATUS) == 0)
stat = readl(cp->regs + REG_PCS_MII_STATUS);
/* The remote-fault indication is only valid
* when autoneg has completed.
*/
if ((stat & (PCS_MII_STATUS_AUTONEG_COMP |
PCS_MII_STATUS_REMOTE_FAULT)) ==
(PCS_MII_STATUS_AUTONEG_COMP | PCS_MII_STATUS_REMOTE_FAULT)) {
if (netif_msg_link(cp))
printk(KERN_INFO "%s: PCS RemoteFault\n",
cp->dev->name);
}
/* work around link detection issue by querying the PCS state
* machine directly.
*/
state_machine = readl(cp->regs + REG_PCS_STATE_MACHINE);
if ((state_machine & PCS_SM_LINK_STATE_MASK) != SM_LINK_STATE_UP) {
stat &= ~PCS_MII_STATUS_LINK_STATUS;
} else if (state_machine & PCS_SM_WORD_SYNC_STATE_MASK) {
stat |= PCS_MII_STATUS_LINK_STATUS;
}
if (stat & PCS_MII_STATUS_LINK_STATUS) {
if (cp->lstate != link_up) {
if (cp->opened) {
cp->lstate = link_up;
cp->link_transition = LINK_TRANSITION_LINK_UP;
cas_set_link_modes(cp);
netif_carrier_on(cp->dev);
}
}
} else if (cp->lstate == link_up) {
cp->lstate = link_down;
if (link_transition_timeout != 0 &&
cp->link_transition != LINK_TRANSITION_REQUESTED_RESET &&
!cp->link_transition_jiffies_valid) {
/*
* force a reset, as a workaround for the
* link-failure problem. May want to move this to a
* point a bit earlier in the sequence. If we had
* generated a reset a short time ago, we'll wait for
* the link timer to check the status until a
* timer expires (link_transistion_jiffies_valid is
* true when the timer is running.) Instead of using
* a system timer, we just do a check whenever the
* link timer is running - this clears the flag after
* a suitable delay.
*/
retval = 1;
cp->link_transition = LINK_TRANSITION_REQUESTED_RESET;
cp->link_transition_jiffies = jiffies;
cp->link_transition_jiffies_valid = 1;
} else {
cp->link_transition = LINK_TRANSITION_ON_FAILURE;
}
netif_carrier_off(cp->dev);
if (cp->opened && netif_msg_link(cp)) {
printk(KERN_INFO "%s: PCS link down.\n",
cp->dev->name);
}
/* Cassini only: if you force a mode, there can be
* sync problems on link down. to fix that, the following
* things need to be checked:
* 1) read serialink state register
* 2) read pcs status register to verify link down.
* 3) if link down and serial link == 0x03, then you need
* to global reset the chip.
*/
if ((cp->cas_flags & CAS_FLAG_REG_PLUS) == 0) {
/* should check to see if we're in a forced mode */
stat = readl(cp->regs + REG_PCS_SERDES_STATE);
if (stat == 0x03)
return 1;
}
} else if (cp->lstate == link_down) {
if (link_transition_timeout != 0 &&
cp->link_transition != LINK_TRANSITION_REQUESTED_RESET &&
!cp->link_transition_jiffies_valid) {
/* force a reset, as a workaround for the
* link-failure problem. May want to move
* this to a point a bit earlier in the
* sequence.
*/
retval = 1;
cp->link_transition = LINK_TRANSITION_REQUESTED_RESET;
cp->link_transition_jiffies = jiffies;
cp->link_transition_jiffies_valid = 1;
} else {
cp->link_transition = LINK_TRANSITION_STILL_FAILED;
}
}
return retval;
}
static int cas_pcs_interrupt(struct net_device *dev,
struct cas *cp, u32 status)
{
u32 stat = readl(cp->regs + REG_PCS_INTR_STATUS);
if ((stat & PCS_INTR_STATUS_LINK_CHANGE) == 0)
return 0;
return cas_pcs_link_check(cp);
}
static int cas_txmac_interrupt(struct net_device *dev,
struct cas *cp, u32 status)
{
u32 txmac_stat = readl(cp->regs + REG_MAC_TX_STATUS);
if (!txmac_stat)
return 0;
if (netif_msg_intr(cp))
printk(KERN_DEBUG "%s: txmac interrupt, txmac_stat: 0x%x\n",
cp->dev->name, txmac_stat);
/* Defer timer expiration is quite normal,
* don't even log the event.
*/
if ((txmac_stat & MAC_TX_DEFER_TIMER) &&
!(txmac_stat & ~MAC_TX_DEFER_TIMER))
return 0;
spin_lock(&cp->stat_lock[0]);
if (txmac_stat & MAC_TX_UNDERRUN) {
printk(KERN_ERR "%s: TX MAC xmit underrun.\n",
dev->name);
cp->net_stats[0].tx_fifo_errors++;
}
if (txmac_stat & MAC_TX_MAX_PACKET_ERR) {
printk(KERN_ERR "%s: TX MAC max packet size error.\n",
dev->name);
cp->net_stats[0].tx_errors++;
}
/* The rest are all cases of one of the 16-bit TX
* counters expiring.
*/
if (txmac_stat & MAC_TX_COLL_NORMAL)
cp->net_stats[0].collisions += 0x10000;
if (txmac_stat & MAC_TX_COLL_EXCESS) {
cp->net_stats[0].tx_aborted_errors += 0x10000;
cp->net_stats[0].collisions += 0x10000;
}
if (txmac_stat & MAC_TX_COLL_LATE) {
cp->net_stats[0].tx_aborted_errors += 0x10000;
cp->net_stats[0].collisions += 0x10000;
}
spin_unlock(&cp->stat_lock[0]);
/* We do not keep track of MAC_TX_COLL_FIRST and
* MAC_TX_PEAK_ATTEMPTS events.
*/
return 0;
}
static void cas_load_firmware(struct cas *cp, cas_hp_inst_t *firmware)
{
cas_hp_inst_t *inst;
u32 val;
int i;
i = 0;
while ((inst = firmware) && inst->note) {
writel(i, cp->regs + REG_HP_INSTR_RAM_ADDR);
val = CAS_BASE(HP_INSTR_RAM_HI_VAL, inst->val);
val |= CAS_BASE(HP_INSTR_RAM_HI_MASK, inst->mask);
writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_HI);
val = CAS_BASE(HP_INSTR_RAM_MID_OUTARG, inst->outarg >> 10);
val |= CAS_BASE(HP_INSTR_RAM_MID_OUTOP, inst->outop);
val |= CAS_BASE(HP_INSTR_RAM_MID_FNEXT, inst->fnext);
val |= CAS_BASE(HP_INSTR_RAM_MID_FOFF, inst->foff);
val |= CAS_BASE(HP_INSTR_RAM_MID_SNEXT, inst->snext);
val |= CAS_BASE(HP_INSTR_RAM_MID_SOFF, inst->soff);
val |= CAS_BASE(HP_INSTR_RAM_MID_OP, inst->op);
writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_MID);
val = CAS_BASE(HP_INSTR_RAM_LOW_OUTMASK, inst->outmask);
val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTSHIFT, inst->outshift);
val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTEN, inst->outenab);
val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTARG, inst->outarg);
writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_LOW);
++firmware;
++i;
}
}
static void cas_init_rx_dma(struct cas *cp)
{
u64 desc_dma = cp->block_dvma;
u32 val;
int i, size;
/* rx free descriptors */
val = CAS_BASE(RX_CFG_SWIVEL, RX_SWIVEL_OFF_VAL);
val |= CAS_BASE(RX_CFG_DESC_RING, RX_DESC_RINGN_INDEX(0));
val |= CAS_BASE(RX_CFG_COMP_RING, RX_COMP_RINGN_INDEX(0));
if ((N_RX_DESC_RINGS > 1) &&
(cp->cas_flags & CAS_FLAG_REG_PLUS)) /* do desc 2 */
val |= CAS_BASE(RX_CFG_DESC_RING1, RX_DESC_RINGN_INDEX(1));
writel(val, cp->regs + REG_RX_CFG);
val = (unsigned long) cp->init_rxds[0] -
(unsigned long) cp->init_block;
writel((desc_dma + val) >> 32, cp->regs + REG_RX_DB_HI);
writel((desc_dma + val) & 0xffffffff, cp->regs + REG_RX_DB_LOW);
writel(RX_DESC_RINGN_SIZE(0) - 4, cp->regs + REG_RX_KICK);
if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
/* rx desc 2 is for IPSEC packets. however,
* we don't it that for that purpose.
*/
val = (unsigned long) cp->init_rxds[1] -
(unsigned long) cp->init_block;
writel((desc_dma + val) >> 32, cp->regs + REG_PLUS_RX_DB1_HI);
writel((desc_dma + val) & 0xffffffff, cp->regs +
REG_PLUS_RX_DB1_LOW);
writel(RX_DESC_RINGN_SIZE(1) - 4, cp->regs +
REG_PLUS_RX_KICK1);
}
/* rx completion registers */
val = (unsigned long) cp->init_rxcs[0] -
(unsigned long) cp->init_block;
writel((desc_dma + val) >> 32, cp->regs + REG_RX_CB_HI);
writel((desc_dma + val) & 0xffffffff, cp->regs + REG_RX_CB_LOW);
if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
/* rx comp 2-4 */
for (i = 1; i < MAX_RX_COMP_RINGS; i++) {
val = (unsigned long) cp->init_rxcs[i] -
(unsigned long) cp->init_block;
writel((desc_dma + val) >> 32, cp->regs +
REG_PLUS_RX_CBN_HI(i));
writel((desc_dma + val) & 0xffffffff, cp->regs +
REG_PLUS_RX_CBN_LOW(i));
}
}
/* read selective clear regs to prevent spurious interrupts
* on reset because complete == kick.
* selective clear set up to prevent interrupts on resets
*/
readl(cp->regs + REG_INTR_STATUS_ALIAS);
writel(INTR_RX_DONE | INTR_RX_BUF_UNAVAIL, cp->regs + REG_ALIAS_CLEAR);
if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
for (i = 1; i < N_RX_COMP_RINGS; i++)
readl(cp->regs + REG_PLUS_INTRN_STATUS_ALIAS(i));
/* 2 is different from 3 and 4 */
if (N_RX_COMP_RINGS > 1)
writel(INTR_RX_DONE_ALT | INTR_RX_BUF_UNAVAIL_1,
cp->regs + REG_PLUS_ALIASN_CLEAR(1));
for (i = 2; i < N_RX_COMP_RINGS; i++)
writel(INTR_RX_DONE_ALT,
cp->regs + REG_PLUS_ALIASN_CLEAR(i));
}
/* set up pause thresholds */
val = CAS_BASE(RX_PAUSE_THRESH_OFF,
cp->rx_pause_off / RX_PAUSE_THRESH_QUANTUM);
val |= CAS_BASE(RX_PAUSE_THRESH_ON,
cp->rx_pause_on / RX_PAUSE_THRESH_QUANTUM);
writel(val, cp->regs + REG_RX_PAUSE_THRESH);
/* zero out dma reassembly buffers */
for (i = 0; i < 64; i++) {
writel(i, cp->regs + REG_RX_TABLE_ADDR);
writel(0x0, cp->regs + REG_RX_TABLE_DATA_LOW);
writel(0x0, cp->regs + REG_RX_TABLE_DATA_MID);
writel(0x0, cp->regs + REG_RX_TABLE_DATA_HI);
}
/* make sure address register is 0 for normal operation */
writel(0x0, cp->regs + REG_RX_CTRL_FIFO_ADDR);
writel(0x0, cp->regs + REG_RX_IPP_FIFO_ADDR);
/* interrupt mitigation */
#ifdef USE_RX_BLANK
val = CAS_BASE(RX_BLANK_INTR_TIME, RX_BLANK_INTR_TIME_VAL);
val |= CAS_BASE(RX_BLANK_INTR_PKT, RX_BLANK_INTR_PKT_VAL);
writel(val, cp->regs + REG_RX_BLANK);
#else
writel(0x0, cp->regs + REG_RX_BLANK);
#endif
/* interrupt generation as a function of low water marks for
* free desc and completion entries. these are used to trigger
* housekeeping for rx descs. we don't use the free interrupt
* as it's not very useful
*/
/* val = CAS_BASE(RX_AE_THRESH_FREE, RX_AE_FREEN_VAL(0)); */
val = CAS_BASE(RX_AE_THRESH_COMP, RX_AE_COMP_VAL);
writel(val, cp->regs + REG_RX_AE_THRESH);
if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
val = CAS_BASE(RX_AE1_THRESH_FREE, RX_AE_FREEN_VAL(1));
writel(val, cp->regs + REG_PLUS_RX_AE1_THRESH);
}
/* Random early detect registers. useful for congestion avoidance.
* this should be tunable.
*/
writel(0x0, cp->regs + REG_RX_RED);
/* receive page sizes. default == 2K (0x800) */
val = 0;
if (cp->page_size == 0x1000)
val = 0x1;
else if (cp->page_size == 0x2000)
val = 0x2;
else if (cp->page_size == 0x4000)
val = 0x3;
/* round mtu + offset. constrain to page size. */
size = cp->dev->mtu + 64;
if (size > cp->page_size)
size = cp->page_size;
if (size <= 0x400)
i = 0x0;
else if (size <= 0x800)
i = 0x1;
else if (size <= 0x1000)
i = 0x2;
else
i = 0x3;
cp->mtu_stride = 1 << (i + 10);
val = CAS_BASE(RX_PAGE_SIZE, val);
val |= CAS_BASE(RX_PAGE_SIZE_MTU_STRIDE, i);
val |= CAS_BASE(RX_PAGE_SIZE_MTU_COUNT, cp->page_size >> (i + 10));
val |= CAS_BASE(RX_PAGE_SIZE_MTU_OFF, 0x1);
writel(val, cp->regs + REG_RX_PAGE_SIZE);
/* enable the header parser if desired */
if (CAS_HP_FIRMWARE == cas_prog_null)
return;
val = CAS_BASE(HP_CFG_NUM_CPU, CAS_NCPUS > 63 ? 0 : CAS_NCPUS);
val |= HP_CFG_PARSE_EN | HP_CFG_SYN_INC_MASK;
val |= CAS_BASE(HP_CFG_TCP_THRESH, HP_TCP_THRESH_VAL);
writel(val, cp->regs + REG_HP_CFG);
}
static inline void cas_rxc_init(struct cas_rx_comp *rxc)
{
memset(rxc, 0, sizeof(*rxc));
rxc->word4 = cpu_to_le64(RX_COMP4_ZERO);
}
/* NOTE: we use the ENC RX DESC ring for spares. the rx_page[0,1]
* flipping is protected by the fact that the chip will not
* hand back the same page index while it's being processed.
*/
static inline cas_page_t *cas_page_spare(struct cas *cp, const int index)
{
cas_page_t *page = cp->rx_pages[1][index];
cas_page_t *new;
if (page_count(page->buffer) == 1)
return page;
new = cas_page_dequeue(cp);
if (new) {
spin_lock(&cp->rx_inuse_lock);
list_add(&page->list, &cp->rx_inuse_list);
spin_unlock(&cp->rx_inuse_lock);
}
return new;
}
/* this needs to be changed if we actually use the ENC RX DESC ring */
static cas_page_t *cas_page_swap(struct cas *cp, const int ring,
const int index)
{
cas_page_t **page0 = cp->rx_pages[0];
cas_page_t **page1 = cp->rx_pages[1];
/* swap if buffer is in use */
if (page_count(page0[index]->buffer) > 1) {
cas_page_t *new = cas_page_spare(cp, index);
if (new) {
page1[index] = page0[index];
page0[index] = new;
}
}
RX_USED_SET(page0[index], 0);
return page0[index];
}
static void cas_clean_rxds(struct cas *cp)
{
/* only clean ring 0 as ring 1 is used for spare buffers */
struct cas_rx_desc *rxd = cp->init_rxds[0];
int i, size;
/* release all rx flows */
for (i = 0; i < N_RX_FLOWS; i++) {
struct sk_buff *skb;
while ((skb = __skb_dequeue(&cp->rx_flows[i]))) {
cas_skb_release(skb);
}
}
/* initialize descriptors */
size = RX_DESC_RINGN_SIZE(0);
for (i = 0; i < size; i++) {
cas_page_t *page = cas_page_swap(cp, 0, i);
rxd[i].buffer = cpu_to_le64(page->dma_addr);
rxd[i].index = cpu_to_le64(CAS_BASE(RX_INDEX_NUM, i) |
CAS_BASE(RX_INDEX_RING, 0));
}
cp->rx_old[0] = RX_DESC_RINGN_SIZE(0) - 4;
cp->rx_last[0] = 0;
cp->cas_flags &= ~CAS_FLAG_RXD_POST(0);
}
static void cas_clean_rxcs(struct cas *cp)
{
int i, j;
/* take ownership of rx comp descriptors */
memset(cp->rx_cur, 0, sizeof(*cp->rx_cur)*N_RX_COMP_RINGS);
memset(cp->rx_new, 0, sizeof(*cp->rx_new)*N_RX_COMP_RINGS);
for (i = 0; i < N_RX_COMP_RINGS; i++) {
struct cas_rx_comp *rxc = cp->init_rxcs[i];
for (j = 0; j < RX_COMP_RINGN_SIZE(i); j++) {
cas_rxc_init(rxc + j);
}
}
}
#if 0
/* When we get a RX fifo overflow, the RX unit is probably hung
* so we do the following.
*
* If any part of the reset goes wrong, we return 1 and that causes the
* whole chip to be reset.
*/
static int cas_rxmac_reset(struct cas *cp)
{
struct net_device *dev = cp->dev;
int limit;
u32 val;
/* First, reset MAC RX. */
writel(cp->mac_rx_cfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
for (limit = 0; limit < STOP_TRIES; limit++) {
if (!(readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_EN))
break;
udelay(10);
}
if (limit == STOP_TRIES) {
printk(KERN_ERR "%s: RX MAC will not disable, resetting whole "
"chip.\n", dev->name);
return 1;
}
/* Second, disable RX DMA. */
writel(0, cp->regs + REG_RX_CFG);
for (limit = 0; limit < STOP_TRIES; limit++) {
if (!(readl(cp->regs + REG_RX_CFG) & RX_CFG_DMA_EN))
break;
udelay(10);
}
if (limit == STOP_TRIES) {
printk(KERN_ERR "%s: RX DMA will not disable, resetting whole "
"chip.\n", dev->name);
return 1;
}
mdelay(5);
/* Execute RX reset command. */
writel(SW_RESET_RX, cp->regs + REG_SW_RESET);
for (limit = 0; limit < STOP_TRIES; limit++) {
if (!(readl(cp->regs + REG_SW_RESET) & SW_RESET_RX))
break;
udelay(10);
}
if (limit == STOP_TRIES) {
printk(KERN_ERR "%s: RX reset command will not execute, "
"resetting whole chip.\n", dev->name);
return 1;
}
/* reset driver rx state */
cas_clean_rxds(cp);
cas_clean_rxcs(cp);
/* Now, reprogram the rest of RX unit. */
cas_init_rx_dma(cp);
/* re-enable */
val = readl(cp->regs + REG_RX_CFG);
writel(val | RX_CFG_DMA_EN, cp->regs + REG_RX_CFG);
writel(MAC_RX_FRAME_RECV, cp->regs + REG_MAC_RX_MASK);
val = readl(cp->regs + REG_MAC_RX_CFG);
writel(val | MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
return 0;
}
#endif
static int cas_rxmac_interrupt(struct net_device *dev, struct cas *cp,
u32 status)
{
u32 stat = readl(cp->regs + REG_MAC_RX_STATUS);
if (!stat)
return 0;
if (netif_msg_intr(cp))
printk(KERN_DEBUG "%s: rxmac interrupt, stat: 0x%x\n",
cp->dev->name, stat);
/* these are all rollovers */
spin_lock(&cp->stat_lock[0]);
if (stat & MAC_RX_ALIGN_ERR)
cp->net_stats[0].rx_frame_errors += 0x10000;
if (stat & MAC_RX_CRC_ERR)
cp->net_stats[0].rx_crc_errors += 0x10000;
if (stat & MAC_RX_LEN_ERR)
cp->net_stats[0].rx_length_errors += 0x10000;
if (stat & MAC_RX_OVERFLOW) {
cp->net_stats[0].rx_over_errors++;
cp->net_stats[0].rx_fifo_errors++;
}
/* We do not track MAC_RX_FRAME_COUNT and MAC_RX_VIOL_ERR
* events.
*/
spin_unlock(&cp->stat_lock[0]);
return 0;
}
static int cas_mac_interrupt(struct net_device *dev, struct cas *cp,
u32 status)
{
u32 stat = readl(cp->regs + REG_MAC_CTRL_STATUS);
if (!stat)
return 0;
if (netif_msg_intr(cp))
printk(KERN_DEBUG "%s: mac interrupt, stat: 0x%x\n",
cp->dev->name, stat);
/* This interrupt is just for pause frame and pause
* tracking. It is useful for diagnostics and debug
* but probably by default we will mask these events.
*/
if (stat & MAC_CTRL_PAUSE_STATE)
cp->pause_entered++;
if (stat & MAC_CTRL_PAUSE_RECEIVED)
cp->pause_last_time_recvd = (stat >> 16);
return 0;
}
/* Must be invoked under cp->lock. */
static inline int cas_mdio_link_not_up(struct cas *cp)
{
u16 val;
switch (cp->lstate) {
case link_force_ret:
if (netif_msg_link(cp))
printk(KERN_INFO "%s: Autoneg failed again, keeping"
" forced mode\n", cp->dev->name);
cas_phy_write(cp, MII_BMCR, cp->link_fcntl);
cp->timer_ticks = 5;
cp->lstate = link_force_ok;
cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
break;
case link_aneg:
val = cas_phy_read(cp, MII_BMCR);
/* Try forced modes. we try things in the following order:
* 1000 full -> 100 full/half -> 10 half
*/
val &= ~(BMCR_ANRESTART | BMCR_ANENABLE);
val |= BMCR_FULLDPLX;
val |= (cp->cas_flags & CAS_FLAG_1000MB_CAP) ?
CAS_BMCR_SPEED1000 : BMCR_SPEED100;
cas_phy_write(cp, MII_BMCR, val);
cp->timer_ticks = 5;
cp->lstate = link_force_try;
cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
break;
case link_force_try:
/* Downgrade from 1000 to 100 to 10 Mbps if necessary. */
val = cas_phy_read(cp, MII_BMCR);
cp->timer_ticks = 5;
if (val & CAS_BMCR_SPEED1000) { /* gigabit */
val &= ~CAS_BMCR_SPEED1000;
val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
cas_phy_write(cp, MII_BMCR, val);
break;
}
if (val & BMCR_SPEED100) {
if (val & BMCR_FULLDPLX) /* fd failed */
val &= ~BMCR_FULLDPLX;
else { /* 100Mbps failed */
val &= ~BMCR_SPEED100;
}
cas_phy_write(cp, MII_BMCR, val);
break;
}
default:
break;
}
return 0;
}
/* must be invoked with cp->lock held */
static int cas_mii_link_check(struct cas *cp, const u16 bmsr)
{
int restart;
if (bmsr & BMSR_LSTATUS) {
/* Ok, here we got a link. If we had it due to a forced
* fallback, and we were configured for autoneg, we
* retry a short autoneg pass. If you know your hub is
* broken, use ethtool ;)
*/
if ((cp->lstate == link_force_try) &&
(cp->link_cntl & BMCR_ANENABLE)) {
cp->lstate = link_force_ret;
cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
cas_mif_poll(cp, 0);
cp->link_fcntl = cas_phy_read(cp, MII_BMCR);
cp->timer_ticks = 5;
if (cp->opened && netif_msg_link(cp))
printk(KERN_INFO "%s: Got link after fallback, retrying"
" autoneg once...\n", cp->dev->name);
cas_phy_write(cp, MII_BMCR,
cp->link_fcntl | BMCR_ANENABLE |
BMCR_ANRESTART);
cas_mif_poll(cp, 1);
} else if (cp->lstate != link_up) {
cp->lstate = link_up;
cp->link_transition = LINK_TRANSITION_LINK_UP;
if (cp->opened) {
cas_set_link_modes(cp);
netif_carrier_on(cp->dev);
}
}
return 0;
}
/* link not up. if the link was previously up, we restart the
* whole process
*/
restart = 0;
if (cp->lstate == link_up) {
cp->lstate = link_down;
cp->link_transition = LINK_TRANSITION_LINK_DOWN;
netif_carrier_off(cp->dev);
if (cp->opened && netif_msg_link(cp))
printk(KERN_INFO "%s: Link down\n",
cp->dev->name);
restart = 1;
} else if (++cp->timer_ticks > 10)
cas_mdio_link_not_up(cp);
return restart;
}
static int cas_mif_interrupt(struct net_device *dev, struct cas *cp,
u32 status)
{
u32 stat = readl(cp->regs + REG_MIF_STATUS);
u16 bmsr;
/* check for a link change */
if (CAS_VAL(MIF_STATUS_POLL_STATUS, stat) == 0)
return 0;
bmsr = CAS_VAL(MIF_STATUS_POLL_DATA, stat);
return cas_mii_link_check(cp, bmsr);
}
static int cas_pci_interrupt(struct net_device *dev, struct cas *cp,
u32 status)
{
u32 stat = readl(cp->regs + REG_PCI_ERR_STATUS);
if (!stat)
return 0;
printk(KERN_ERR "%s: PCI error [%04x:%04x] ", dev->name, stat,
readl(cp->regs + REG_BIM_DIAG));
/* cassini+ has this reserved */
if ((stat & PCI_ERR_BADACK) &&
((cp->cas_flags & CAS_FLAG_REG_PLUS) == 0))
printk("<No ACK64# during ABS64 cycle> ");
if (stat & PCI_ERR_DTRTO)
printk("<Delayed transaction timeout> ");
if (stat & PCI_ERR_OTHER)
printk("<other> ");
if (stat & PCI_ERR_BIM_DMA_WRITE)
printk("<BIM DMA 0 write req> ");
if (stat & PCI_ERR_BIM_DMA_READ)
printk("<BIM DMA 0 read req> ");
printk("\n");
if (stat & PCI_ERR_OTHER) {
u16 cfg;
/* Interrogate PCI config space for the
* true cause.
*/
pci_read_config_word(cp->pdev, PCI_STATUS, &cfg);
printk(KERN_ERR "%s: Read PCI cfg space status [%04x]\n",
dev->name, cfg);
if (cfg & PCI_STATUS_PARITY)
printk(KERN_ERR "%s: PCI parity error detected.\n",
dev->name);
if (cfg & PCI_STATUS_SIG_TARGET_ABORT)
printk(KERN_ERR "%s: PCI target abort.\n",
dev->name);
if (cfg & PCI_STATUS_REC_TARGET_ABORT)
printk(KERN_ERR "%s: PCI master acks target abort.\n",
dev->name);
if (cfg & PCI_STATUS_REC_MASTER_ABORT)
printk(KERN_ERR "%s: PCI master abort.\n", dev->name);
if (cfg & PCI_STATUS_SIG_SYSTEM_ERROR)
printk(KERN_ERR "%s: PCI system error SERR#.\n",
dev->name);
if (cfg & PCI_STATUS_DETECTED_PARITY)
printk(KERN_ERR "%s: PCI parity error.\n",
dev->name);
/* Write the error bits back to clear them. */
cfg &= (PCI_STATUS_PARITY |
PCI_STATUS_SIG_TARGET_ABORT |
PCI_STATUS_REC_TARGET_ABORT |
PCI_STATUS_REC_MASTER_ABORT |
PCI_STATUS_SIG_SYSTEM_ERROR |
PCI_STATUS_DETECTED_PARITY);
pci_write_config_word(cp->pdev, PCI_STATUS, cfg);
}
/* For all PCI errors, we should reset the chip. */
return 1;
}
/* All non-normal interrupt conditions get serviced here.
* Returns non-zero if we should just exit the interrupt
* handler right now (ie. if we reset the card which invalidates
* all of the other original irq status bits).
*/
static int cas_abnormal_irq(struct net_device *dev, struct cas *cp,
u32 status)
{
if (status & INTR_RX_TAG_ERROR) {
/* corrupt RX tag framing */
if (netif_msg_rx_err(cp))
printk(KERN_DEBUG "%s: corrupt rx tag framing\n",
cp->dev->name);
spin_lock(&cp->stat_lock[0]);
cp->net_stats[0].rx_errors++;
spin_unlock(&cp->stat_lock[0]);
goto do_reset;
}
if (status & INTR_RX_LEN_MISMATCH) {
/* length mismatch. */
if (netif_msg_rx_err(cp))
printk(KERN_DEBUG "%s: length mismatch for rx frame\n",
cp->dev->name);
spin_lock(&cp->stat_lock[0]);
cp->net_stats[0].rx_errors++;
spin_unlock(&cp->stat_lock[0]);
goto do_reset;
}
if (status & INTR_PCS_STATUS) {
if (cas_pcs_interrupt(dev, cp, status))
goto do_reset;
}
if (status & INTR_TX_MAC_STATUS) {
if (cas_txmac_interrupt(dev, cp, status))
goto do_reset;
}
if (status & INTR_RX_MAC_STATUS) {
if (cas_rxmac_interrupt(dev, cp, status))
goto do_reset;
}
if (status & INTR_MAC_CTRL_STATUS) {
if (cas_mac_interrupt(dev, cp, status))
goto do_reset;
}
if (status & INTR_MIF_STATUS) {
if (cas_mif_interrupt(dev, cp, status))
goto do_reset;
}
if (status & INTR_PCI_ERROR_STATUS) {
if (cas_pci_interrupt(dev, cp, status))
goto do_reset;
}
return 0;
do_reset:
#if 1
atomic_inc(&cp->reset_task_pending);
atomic_inc(&cp->reset_task_pending_all);
printk(KERN_ERR "%s:reset called in cas_abnormal_irq [0x%x]\n",
dev->name, status);
schedule_work(&cp->reset_task);
#else
atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
printk(KERN_ERR "reset called in cas_abnormal_irq\n");
schedule_work(&cp->reset_task);
#endif
return 1;
}
/* NOTE: CAS_TABORT returns 1 or 2 so that it can be used when
* determining whether to do a netif_stop/wakeup
*/
#define CAS_TABORT(x) (((x)->cas_flags & CAS_FLAG_TARGET_ABORT) ? 2 : 1)
#define CAS_ROUND_PAGE(x) (((x) + PAGE_SIZE - 1) & PAGE_MASK)
static inline int cas_calc_tabort(struct cas *cp, const unsigned long addr,
const int len)
{
unsigned long off = addr + len;
if (CAS_TABORT(cp) == 1)
return 0;
if ((CAS_ROUND_PAGE(off) - off) > TX_TARGET_ABORT_LEN)
return 0;
return TX_TARGET_ABORT_LEN;
}
static inline void cas_tx_ringN(struct cas *cp, int ring, int limit)
{
struct cas_tx_desc *txds;
struct sk_buff **skbs;
struct net_device *dev = cp->dev;
int entry, count;
spin_lock(&cp->tx_lock[ring]);
txds = cp->init_txds[ring];
skbs = cp->tx_skbs[ring];
entry = cp->tx_old[ring];
count = TX_BUFF_COUNT(ring, entry, limit);
while (entry != limit) {
struct sk_buff *skb = skbs[entry];
dma_addr_t daddr;
u32 dlen;
int frag;
if (!skb) {
/* this should never occur */
entry = TX_DESC_NEXT(ring, entry);
continue;
}
/* however, we might get only a partial skb release. */
count -= skb_shinfo(skb)->nr_frags +
+ cp->tx_tiny_use[ring][entry].nbufs + 1;
if (count < 0)
break;
if (netif_msg_tx_done(cp))
printk(KERN_DEBUG "%s: tx[%d] done, slot %d\n",
cp->dev->name, ring, entry);
skbs[entry] = NULL;
cp->tx_tiny_use[ring][entry].nbufs = 0;
for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) {
struct cas_tx_desc *txd = txds + entry;
daddr = le64_to_cpu(txd->buffer);
dlen = CAS_VAL(TX_DESC_BUFLEN,
le64_to_cpu(txd->control));
pci_unmap_page(cp->pdev, daddr, dlen,
PCI_DMA_TODEVICE);
entry = TX_DESC_NEXT(ring, entry);
/* tiny buffer may follow */
if (cp->tx_tiny_use[ring][entry].used) {
cp->tx_tiny_use[ring][entry].used = 0;
entry = TX_DESC_NEXT(ring, entry);
}
}
spin_lock(&cp->stat_lock[ring]);
cp->net_stats[ring].tx_packets++;
cp->net_stats[ring].tx_bytes += skb->len;
spin_unlock(&cp->stat_lock[ring]);
dev_kfree_skb_irq(skb);
}
cp->tx_old[ring] = entry;
/* this is wrong for multiple tx rings. the net device needs
* multiple queues for this to do the right thing. we wait
* for 2*packets to be available when using tiny buffers
*/
if (netif_queue_stopped(dev) &&
(TX_BUFFS_AVAIL(cp, ring) > CAS_TABORT(cp)*(MAX_SKB_FRAGS + 1)))
netif_wake_queue(dev);
spin_unlock(&cp->tx_lock[ring]);
}
static void cas_tx(struct net_device *dev, struct cas *cp,
u32 status)
{
int limit, ring;
#ifdef USE_TX_COMPWB
u64 compwb = le64_to_cpu(cp->init_block->tx_compwb);
#endif
if (netif_msg_intr(cp))
printk(KERN_DEBUG "%s: tx interrupt, status: 0x%x, %llx\n",
cp->dev->name, status, (unsigned long long)compwb);
/* process all the rings */
for (ring = 0; ring < N_TX_RINGS; ring++) {
#ifdef USE_TX_COMPWB
/* use the completion writeback registers */
limit = (CAS_VAL(TX_COMPWB_MSB, compwb) << 8) |
CAS_VAL(TX_COMPWB_LSB, compwb);
compwb = TX_COMPWB_NEXT(compwb);
#else
limit = readl(cp->regs + REG_TX_COMPN(ring));
#endif
if (cp->tx_old[ring] != limit)
cas_tx_ringN(cp, ring, limit);
}
}
static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
int entry, const u64 *words,
struct sk_buff **skbref)
{
int dlen, hlen, len, i, alloclen;
int off, swivel = RX_SWIVEL_OFF_VAL;
struct cas_page *page;
struct sk_buff *skb;
void *addr, *crcaddr;
__sum16 csum;
char *p;
hlen = CAS_VAL(RX_COMP2_HDR_SIZE, words[1]);
dlen = CAS_VAL(RX_COMP1_DATA_SIZE, words[0]);
len = hlen + dlen;
if (RX_COPY_ALWAYS || (words[2] & RX_COMP3_SMALL_PKT))
alloclen = len;
else
alloclen = max(hlen, RX_COPY_MIN);
skb = dev_alloc_skb(alloclen + swivel + cp->crc_size);
if (skb == NULL)
return -1;
*skbref = skb;
skb_reserve(skb, swivel);
p = skb->data;
addr = crcaddr = NULL;
if (hlen) { /* always copy header pages */
i = CAS_VAL(RX_COMP2_HDR_INDEX, words[1]);
page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
off = CAS_VAL(RX_COMP2_HDR_OFF, words[1]) * 0x100 +
swivel;
i = hlen;
if (!dlen) /* attach FCS */
i += cp->crc_size;
pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
PCI_DMA_FROMDEVICE);
addr = cas_page_map(page->buffer);
memcpy(p, addr + off, i);
pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
PCI_DMA_FROMDEVICE);
cas_page_unmap(addr);
RX_USED_ADD(page, 0x100);
p += hlen;
swivel = 0;
}
if (alloclen < (hlen + dlen)) {
skb_frag_t *frag = skb_shinfo(skb)->frags;
/* normal or jumbo packets. we use frags */
i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
off = CAS_VAL(RX_COMP1_DATA_OFF, words[0]) + swivel;
hlen = min(cp->page_size - off, dlen);
if (hlen < 0) {
if (netif_msg_rx_err(cp)) {
printk(KERN_DEBUG "%s: rx page overflow: "
"%d\n", cp->dev->name, hlen);
}
dev_kfree_skb_irq(skb);
return -1;
}
i = hlen;
if (i == dlen) /* attach FCS */
i += cp->crc_size;
pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
PCI_DMA_FROMDEVICE);
/* make sure we always copy a header */
swivel = 0;
if (p == (char *) skb->data) { /* not split */
addr = cas_page_map(page->buffer);
memcpy(p, addr + off, RX_COPY_MIN);
pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
PCI_DMA_FROMDEVICE);
cas_page_unmap(addr);
off += RX_COPY_MIN;
swivel = RX_COPY_MIN;
RX_USED_ADD(page, cp->mtu_stride);
} else {
RX_USED_ADD(page, hlen);
}
skb_put(skb, alloclen);
skb_shinfo(skb)->nr_frags++;
skb->data_len += hlen - swivel;
skb->truesize += hlen - swivel;
skb->len += hlen - swivel;
get_page(page->buffer);
frag->page = page->buffer;
frag->page_offset = off;
frag->size = hlen - swivel;
/* any more data? */
if ((words[0] & RX_COMP1_SPLIT_PKT) && ((dlen -= hlen) > 0)) {
hlen = dlen;
off = 0;
i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr,
hlen + cp->crc_size,
PCI_DMA_FROMDEVICE);
pci_dma_sync_single_for_device(cp->pdev, page->dma_addr,
hlen + cp->crc_size,
PCI_DMA_FROMDEVICE);
skb_shinfo(skb)->nr_frags++;
skb->data_len += hlen;
skb->len += hlen;
frag++;
get_page(page->buffer);
frag->page = page->buffer;
frag->page_offset = 0;
frag->size = hlen;
RX_USED_ADD(page, hlen + cp->crc_size);
}
if (cp->crc_size) {
addr = cas_page_map(page->buffer);
crcaddr = addr + off + hlen;
}
} else {
/* copying packet */
if (!dlen)
goto end_copy_pkt;
i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
off = CAS_VAL(RX_COMP1_DATA_OFF, words[0]) + swivel;
hlen = min(cp->page_size - off, dlen);
if (hlen < 0) {
if (netif_msg_rx_err(cp)) {
printk(KERN_DEBUG "%s: rx page overflow: "
"%d\n", cp->dev->name, hlen);
}
dev_kfree_skb_irq(skb);
return -1;
}
i = hlen;
if (i == dlen) /* attach FCS */
i += cp->crc_size;
pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
PCI_DMA_FROMDEVICE);
addr = cas_page_map(page->buffer);
memcpy(p, addr + off, i);
pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
PCI_DMA_FROMDEVICE);
cas_page_unmap(addr);
if (p == (char *) skb->data) /* not split */
RX_USED_ADD(page, cp->mtu_stride);
else
RX_USED_ADD(page, i);
/* any more data? */
if ((words[0] & RX_COMP1_SPLIT_PKT) && ((dlen -= hlen) > 0)) {
p += hlen;
i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr,
dlen + cp->crc_size,
PCI_DMA_FROMDEVICE);
addr = cas_page_map(page->buffer);
memcpy(p, addr, dlen + cp->crc_size);
pci_dma_sync_single_for_device(cp->pdev, page->dma_addr,
dlen + cp->crc_size,
PCI_DMA_FROMDEVICE);
cas_page_unmap(addr);
RX_USED_ADD(page, dlen + cp->crc_size);
}
end_copy_pkt:
if (cp->crc_size) {
addr = NULL;
crcaddr = skb->data + alloclen;
}
skb_put(skb, alloclen);
}
csum = (__force __sum16)htons(CAS_VAL(RX_COMP4_TCP_CSUM, words[3]));
if (cp->crc_size) {
/* checksum includes FCS. strip it out. */
csum = csum_fold(csum_partial(crcaddr, cp->crc_size,
csum_unfold(csum)));
if (addr)
cas_page_unmap(addr);
}
skb->protocol = eth_type_trans(skb, cp->dev);
if (skb->protocol == htons(ETH_P_IP)) {
skb->csum = csum_unfold(~csum);
skb->ip_summed = CHECKSUM_COMPLETE;
} else
skb->ip_summed = CHECKSUM_NONE;
return len;
}
/* we can handle up to 64 rx flows at a time. we do the same thing
* as nonreassm except that we batch up the buffers.
* NOTE: we currently just treat each flow as a bunch of packets that
* we pass up. a better way would be to coalesce the packets
* into a jumbo packet. to do that, we need to do the following:
* 1) the first packet will have a clean split between header and
* data. save both.
* 2) each time the next flow packet comes in, extend the
* data length and merge the checksums.
* 3) on flow release, fix up the header.
* 4) make sure the higher layer doesn't care.
* because packets get coalesced, we shouldn't run into fragment count
* issues.
*/
static inline void cas_rx_flow_pkt(struct cas *cp, const u64 *words,
struct sk_buff *skb)
{
int flowid = CAS_VAL(RX_COMP3_FLOWID, words[2]) & (N_RX_FLOWS - 1);
struct sk_buff_head *flow = &cp->rx_flows[flowid];
/* this is protected at a higher layer, so no need to
* do any additional locking here. stick the buffer
* at the end.
*/
__skb_queue_tail(flow, skb);
if (words[0] & RX_COMP1_RELEASE_FLOW) {
while ((skb = __skb_dequeue(flow))) {
cas_skb_release(skb);
}
}
}
/* put rx descriptor back on ring. if a buffer is in use by a higher
* layer, this will need to put in a replacement.
*/
static void cas_post_page(struct cas *cp, const int ring, const int index)
{
cas_page_t *new;
int entry;
entry = cp->rx_old[ring];
new = cas_page_swap(cp, ring, index);
cp->init_rxds[ring][entry].buffer = cpu_to_le64(new->dma_addr);
cp->init_rxds[ring][entry].index =
cpu_to_le64(CAS_BASE(RX_INDEX_NUM, index) |
CAS_BASE(RX_INDEX_RING, ring));
entry = RX_DESC_ENTRY(ring, entry + 1);
cp->rx_old[ring] = entry;
if (entry % 4)
return;
if (ring == 0)
writel(entry, cp->regs + REG_RX_KICK);
else if ((N_RX_DESC_RINGS > 1) &&
(cp->cas_flags & CAS_FLAG_REG_PLUS))
writel(entry, cp->regs + REG_PLUS_RX_KICK1);
}
/* only when things are bad */
static int cas_post_rxds_ringN(struct cas *cp, int ring, int num)
{
unsigned int entry, last, count, released;
int cluster;
cas_page_t **page = cp->rx_pages[ring];
entry = cp->rx_old[ring];
if (netif_msg_intr(cp))
printk(KERN_DEBUG "%s: rxd[%d] interrupt, done: %d\n",
cp->dev->name, ring, entry);
cluster = -1;
count = entry & 0x3;
last = RX_DESC_ENTRY(ring, num ? entry + num - 4: entry - 4);
released = 0;
while (entry != last) {
/* make a new buffer if it's still in use */
if (page_count(page[entry]->buffer) > 1) {
cas_page_t *new = cas_page_dequeue(cp);
if (!new) {
/* let the timer know that we need to
* do this again
*/
cp->cas_flags |= CAS_FLAG_RXD_POST(ring);
if (!timer_pending(&cp->link_timer))
mod_timer(&cp->link_timer, jiffies +
CAS_LINK_FAST_TIMEOUT);
cp->rx_old[ring] = entry;
cp->rx_last[ring] = num ? num - released : 0;
return -ENOMEM;
}
spin_lock(&cp->rx_inuse_lock);
list_add(&page[entry]->list, &cp->rx_inuse_list);
spin_unlock(&cp->rx_inuse_lock);
cp->init_rxds[ring][entry].buffer =
cpu_to_le64(new->dma_addr);
page[entry] = new;
}
if (++count == 4) {
cluster = entry;
count = 0;
}
released++;
entry = RX_DESC_ENTRY(ring, entry + 1);
}
cp->rx_old[ring] = entry;
if (cluster < 0)
return 0;
if (ring == 0)
writel(cluster, cp->regs + REG_RX_KICK);
else if ((N_RX_DESC_RINGS > 1) &&
(cp->cas_flags & CAS_FLAG_REG_PLUS))
writel(cluster, cp->regs + REG_PLUS_RX_KICK1);
return 0;
}
/* process a completion ring. packets are set up in three basic ways:
* small packets: should be copied header + data in single buffer.
* large packets: header and data in a single buffer.
* split packets: header in a separate buffer from data.
* data may be in multiple pages. data may be > 256
* bytes but in a single page.
*
* NOTE: RX page posting is done in this routine as well. while there's
* the capability of using multiple RX completion rings, it isn't
* really worthwhile due to the fact that the page posting will
* force serialization on the single descriptor ring.
*/
static int cas_rx_ringN(struct cas *cp, int ring, int budget)
{
struct cas_rx_comp *rxcs = cp->init_rxcs[ring];
int entry, drops;
int npackets = 0;
if (netif_msg_intr(cp))
printk(KERN_DEBUG "%s: rx[%d] interrupt, done: %d/%d\n",
cp->dev->name, ring,
readl(cp->regs + REG_RX_COMP_HEAD),
cp->rx_new[ring]);
entry = cp->rx_new[ring];
drops = 0;
while (1) {
struct cas_rx_comp *rxc = rxcs + entry;
struct sk_buff *uninitialized_var(skb);
int type, len;
u64 words[4];
int i, dring;
words[0] = le64_to_cpu(rxc->word1);
words[1] = le64_to_cpu(rxc->word2);
words[2] = le64_to_cpu(rxc->word3);
words[3] = le64_to_cpu(rxc->word4);
/* don't touch if still owned by hw */
type = CAS_VAL(RX_COMP1_TYPE, words[0]);
if (type == 0)
break;
/* hw hasn't cleared the zero bit yet */
if (words[3] & RX_COMP4_ZERO) {
break;
}
/* get info on the packet */
if (words[3] & (RX_COMP4_LEN_MISMATCH | RX_COMP4_BAD)) {
spin_lock(&cp->stat_lock[ring]);
cp->net_stats[ring].rx_errors++;
if (words[3] & RX_COMP4_LEN_MISMATCH)
cp->net_stats[ring].rx_length_errors++;
if (words[3] & RX_COMP4_BAD)
cp->net_stats[ring].rx_crc_errors++;
spin_unlock(&cp->stat_lock[ring]);
/* We'll just return it to Cassini. */
drop_it:
spin_lock(&cp->stat_lock[ring]);
++cp->net_stats[ring].rx_dropped;
spin_unlock(&cp->stat_lock[ring]);
goto next;
}
len = cas_rx_process_pkt(cp, rxc, entry, words, &skb);
if (len < 0) {
++drops;
goto drop_it;
}
/* see if it's a flow re-assembly or not. the driver
* itself handles release back up.
*/
if (RX_DONT_BATCH || (type == 0x2)) {
/* non-reassm: these always get released */
cas_skb_release(skb);
} else {
cas_rx_flow_pkt(cp, words, skb);
}
spin_lock(&cp->stat_lock[ring]);
cp->net_stats[ring].rx_packets++;
cp->net_stats[ring].rx_bytes += len;
spin_unlock(&cp->stat_lock[ring]);
next:
npackets++;
/* should it be released? */
if (words[0] & RX_COMP1_RELEASE_HDR) {
i = CAS_VAL(RX_COMP2_HDR_INDEX, words[1]);
dring = CAS_VAL(RX_INDEX_RING, i);
i = CAS_VAL(RX_INDEX_NUM, i);
cas_post_page(cp, dring, i);
}
if (words[0] & RX_COMP1_RELEASE_DATA) {
i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
dring = CAS_VAL(RX_INDEX_RING, i);
i = CAS_VAL(RX_INDEX_NUM, i);
cas_post_page(cp, dring, i);
}
if (words[0] & RX_COMP1_RELEASE_NEXT) {
i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
dring = CAS_VAL(RX_INDEX_RING, i);
i = CAS_VAL(RX_INDEX_NUM, i);
cas_post_page(cp, dring, i);
}
/* skip to the next entry */
entry = RX_COMP_ENTRY(ring, entry + 1 +
CAS_VAL(RX_COMP1_SKIP, words[0]));
#ifdef USE_NAPI
if (budget && (npackets >= budget))
break;
#endif
}
cp->rx_new[ring] = entry;
if (drops)
printk(KERN_INFO "%s: Memory squeeze, deferring packet.\n",
cp->dev->name);
return npackets;
}
/* put completion entries back on the ring */
static void cas_post_rxcs_ringN(struct net_device *dev,
struct cas *cp, int ring)
{
struct cas_rx_comp *rxc = cp->init_rxcs[ring];
int last, entry;
last = cp->rx_cur[ring];
entry = cp->rx_new[ring];
if (netif_msg_intr(cp))
printk(KERN_DEBUG "%s: rxc[%d] interrupt, done: %d/%d\n",
dev->name, ring, readl(cp->regs + REG_RX_COMP_HEAD),
entry);
/* zero and re-mark descriptors */
while (last != entry) {
cas_rxc_init(rxc + last);
last = RX_COMP_ENTRY(ring, last + 1);
}
cp->rx_cur[ring] = last;
if (ring == 0)
writel(last, cp->regs + REG_RX_COMP_TAIL);
else if (cp->cas_flags & CAS_FLAG_REG_PLUS)
writel(last, cp->regs + REG_PLUS_RX_COMPN_TAIL(ring));
}
/* cassini can use all four PCI interrupts for the completion ring.
* rings 3 and 4 are identical
*/
#if defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
static inline void cas_handle_irqN(struct net_device *dev,
struct cas *cp, const u32 status,
const int ring)
{
if (status & (INTR_RX_COMP_FULL_ALT | INTR_RX_COMP_AF_ALT))
cas_post_rxcs_ringN(dev, cp, ring);
}
static irqreturn_t cas_interruptN(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct cas *cp = netdev_priv(dev);
unsigned long flags;
int ring;
u32 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(ring));
/* check for shared irq */
if (status == 0)
return IRQ_NONE;
ring = (irq == cp->pci_irq_INTC) ? 2 : 3;
spin_lock_irqsave(&cp->lock, flags);
if (status & INTR_RX_DONE_ALT) { /* handle rx separately */
#ifdef USE_NAPI
cas_mask_intr(cp);
napi_schedule(&cp->napi);
#else
cas_rx_ringN(cp, ring, 0);
#endif
status &= ~INTR_RX_DONE_ALT;
}
if (status)
cas_handle_irqN(dev, cp, status, ring);
spin_unlock_irqrestore(&cp->lock, flags);
return IRQ_HANDLED;
}
#endif
#ifdef USE_PCI_INTB
/* everything but rx packets */
static inline void cas_handle_irq1(struct cas *cp, const u32 status)
{
if (status & INTR_RX_BUF_UNAVAIL_1) {
/* Frame arrived, no free RX buffers available.
* NOTE: we can get this on a link transition. */
cas_post_rxds_ringN(cp, 1, 0);
spin_lock(&cp->stat_lock[1]);
cp->net_stats[1].rx_dropped++;
spin_unlock(&cp->stat_lock[1]);
}
if (status & INTR_RX_BUF_AE_1)
cas_post_rxds_ringN(cp, 1, RX_DESC_RINGN_SIZE(1) -
RX_AE_FREEN_VAL(1));
if (status & (INTR_RX_COMP_AF | INTR_RX_COMP_FULL))
cas_post_rxcs_ringN(cp, 1);
}
/* ring 2 handles a few more events than 3 and 4 */
static irqreturn_t cas_interrupt1(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct cas *cp = netdev_priv(dev);
unsigned long flags;
u32 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(1));
/* check for shared interrupt */
if (status == 0)
return IRQ_NONE;
spin_lock_irqsave(&cp->lock, flags);
if (status & INTR_RX_DONE_ALT) { /* handle rx separately */
#ifdef USE_NAPI
cas_mask_intr(cp);
napi_schedule(&cp->napi);
#else
cas_rx_ringN(cp, 1, 0);
#endif
status &= ~INTR_RX_DONE_ALT;
}
if (status)
cas_handle_irq1(cp, status);
spin_unlock_irqrestore(&cp->lock, flags);
return IRQ_HANDLED;
}
#endif
static inline void cas_handle_irq(struct net_device *dev,
struct cas *cp, const u32 status)
{
/* housekeeping interrupts */
if (status & INTR_ERROR_MASK)
cas_abnormal_irq(dev, cp, status);
if (status & INTR_RX_BUF_UNAVAIL) {
/* Frame arrived, no free RX buffers available.
* NOTE: we can get this on a link transition.
*/
cas_post_rxds_ringN(cp, 0, 0);
spin_lock(&cp->stat_lock[0]);
cp->net_stats[0].rx_dropped++;
spin_unlock(&cp->stat_lock[0]);
} else if (status & INTR_RX_BUF_AE) {
cas_post_rxds_ringN(cp, 0, RX_DESC_RINGN_SIZE(0) -
RX_AE_FREEN_VAL(0));
}
if (status & (INTR_RX_COMP_AF | INTR_RX_COMP_FULL))
cas_post_rxcs_ringN(dev, cp, 0);
}
static irqreturn_t cas_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct cas *cp = netdev_priv(dev);
unsigned long flags;
u32 status = readl(cp->regs + REG_INTR_STATUS);
if (status == 0)
return IRQ_NONE;
spin_lock_irqsave(&cp->lock, flags);
if (status & (INTR_TX_ALL | INTR_TX_INTME)) {
cas_tx(dev, cp, status);
status &= ~(INTR_TX_ALL | INTR_TX_INTME);
}
if (status & INTR_RX_DONE) {
#ifdef USE_NAPI
cas_mask_intr(cp);
napi_schedule(&cp->napi);
#else
cas_rx_ringN(cp, 0, 0);
#endif
status &= ~INTR_RX_DONE;
}
if (status)
cas_handle_irq(dev, cp, status);
spin_unlock_irqrestore(&cp->lock, flags);
return IRQ_HANDLED;
}
#ifdef USE_NAPI
static int cas_poll(struct napi_struct *napi, int budget)
{
struct cas *cp = container_of(napi, struct cas, napi);
struct net_device *dev = cp->dev;
int i, enable_intr, credits;
u32 status = readl(cp->regs + REG_INTR_STATUS);
unsigned long flags;
spin_lock_irqsave(&cp->lock, flags);
cas_tx(dev, cp, status);
spin_unlock_irqrestore(&cp->lock, flags);
/* NAPI rx packets. we spread the credits across all of the
* rxc rings
*
* to make sure we're fair with the work we loop through each
* ring N_RX_COMP_RING times with a request of
* budget / N_RX_COMP_RINGS
*/
enable_intr = 1;
credits = 0;
for (i = 0; i < N_RX_COMP_RINGS; i++) {
int j;
for (j = 0; j < N_RX_COMP_RINGS; j++) {
credits += cas_rx_ringN(cp, j, budget / N_RX_COMP_RINGS);
if (credits >= budget) {
enable_intr = 0;
goto rx_comp;
}
}
}
rx_comp:
/* final rx completion */
spin_lock_irqsave(&cp->lock, flags);
if (status)
cas_handle_irq(dev, cp, status);
#ifdef USE_PCI_INTB
if (N_RX_COMP_RINGS > 1) {
status = readl(cp->regs + REG_PLUS_INTRN_STATUS(1));
if (status)
cas_handle_irq1(dev, cp, status);
}
#endif
#ifdef USE_PCI_INTC
if (N_RX_COMP_RINGS > 2) {
status = readl(cp->regs + REG_PLUS_INTRN_STATUS(2));
if (status)
cas_handle_irqN(dev, cp, status, 2);
}
#endif
#ifdef USE_PCI_INTD
if (N_RX_COMP_RINGS > 3) {
status = readl(cp->regs + REG_PLUS_INTRN_STATUS(3));
if (status)
cas_handle_irqN(dev, cp, status, 3);
}
#endif
spin_unlock_irqrestore(&cp->lock, flags);
if (enable_intr) {
napi_complete(napi);
cas_unmask_intr(cp);
}
return credits;
}
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
static void cas_netpoll(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
cas_disable_irq(cp, 0);
cas_interrupt(cp->pdev->irq, dev);
cas_enable_irq(cp, 0);
#ifdef USE_PCI_INTB
if (N_RX_COMP_RINGS > 1) {
/* cas_interrupt1(); */
}
#endif
#ifdef USE_PCI_INTC
if (N_RX_COMP_RINGS > 2) {
/* cas_interruptN(); */
}
#endif
#ifdef USE_PCI_INTD
if (N_RX_COMP_RINGS > 3) {
/* cas_interruptN(); */
}
#endif
}
#endif
static void cas_tx_timeout(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
if (!cp->hw_running) {
printk("%s: hrm.. hw not running!\n", dev->name);
return;
}
printk(KERN_ERR "%s: MIF_STATE[%08x]\n",
dev->name, readl(cp->regs + REG_MIF_STATE_MACHINE));
printk(KERN_ERR "%s: MAC_STATE[%08x]\n",
dev->name, readl(cp->regs + REG_MAC_STATE_MACHINE));
printk(KERN_ERR "%s: TX_STATE[%08x:%08x:%08x] "
"FIFO[%08x:%08x:%08x] SM1[%08x] SM2[%08x]\n",
dev->name,
readl(cp->regs + REG_TX_CFG),
readl(cp->regs + REG_MAC_TX_STATUS),
readl(cp->regs + REG_MAC_TX_CFG),
readl(cp->regs + REG_TX_FIFO_PKT_CNT),
readl(cp->regs + REG_TX_FIFO_WRITE_PTR),
readl(cp->regs + REG_TX_FIFO_READ_PTR),
readl(cp->regs + REG_TX_SM_1),
readl(cp->regs + REG_TX_SM_2));
printk(KERN_ERR "%s: RX_STATE[%08x:%08x:%08x]\n",
dev->name,
readl(cp->regs + REG_RX_CFG),
readl(cp->regs + REG_MAC_RX_STATUS),
readl(cp->regs + REG_MAC_RX_CFG));
printk(KERN_ERR "%s: HP_STATE[%08x:%08x:%08x:%08x]\n",
dev->name,
readl(cp->regs + REG_HP_STATE_MACHINE),
readl(cp->regs + REG_HP_STATUS0),
readl(cp->regs + REG_HP_STATUS1),
readl(cp->regs + REG_HP_STATUS2));
#if 1
atomic_inc(&cp->reset_task_pending);
atomic_inc(&cp->reset_task_pending_all);
schedule_work(&cp->reset_task);
#else
atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
schedule_work(&cp->reset_task);
#endif
}
static inline int cas_intme(int ring, int entry)
{
/* Algorithm: IRQ every 1/2 of descriptors. */
if (!(entry & ((TX_DESC_RINGN_SIZE(ring) >> 1) - 1)))
return 1;
return 0;
}
static void cas_write_txd(struct cas *cp, int ring, int entry,
dma_addr_t mapping, int len, u64 ctrl, int last)
{
struct cas_tx_desc *txd = cp->init_txds[ring] + entry;
ctrl |= CAS_BASE(TX_DESC_BUFLEN, len);
if (cas_intme(ring, entry))
ctrl |= TX_DESC_INTME;
if (last)
ctrl |= TX_DESC_EOF;
txd->control = cpu_to_le64(ctrl);
txd->buffer = cpu_to_le64(mapping);
}
static inline void *tx_tiny_buf(struct cas *cp, const int ring,
const int entry)
{
return cp->tx_tiny_bufs[ring] + TX_TINY_BUF_LEN*entry;
}
static inline dma_addr_t tx_tiny_map(struct cas *cp, const int ring,
const int entry, const int tentry)
{
cp->tx_tiny_use[ring][tentry].nbufs++;
cp->tx_tiny_use[ring][entry].used = 1;
return cp->tx_tiny_dvma[ring] + TX_TINY_BUF_LEN*entry;
}
static inline int cas_xmit_tx_ringN(struct cas *cp, int ring,
struct sk_buff *skb)
{
struct net_device *dev = cp->dev;
int entry, nr_frags, frag, tabort, tentry;
dma_addr_t mapping;
unsigned long flags;
u64 ctrl;
u32 len;
spin_lock_irqsave(&cp->tx_lock[ring], flags);
/* This is a hard error, log it. */
if (TX_BUFFS_AVAIL(cp, ring) <=
CAS_TABORT(cp)*(skb_shinfo(skb)->nr_frags + 1)) {
netif_stop_queue(dev);
spin_unlock_irqrestore(&cp->tx_lock[ring], flags);
printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
"queue awake!\n", dev->name);
return 1;
}
ctrl = 0;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
const u64 csum_start_off = skb_transport_offset(skb);
const u64 csum_stuff_off = csum_start_off + skb->csum_offset;
ctrl = TX_DESC_CSUM_EN |
CAS_BASE(TX_DESC_CSUM_START, csum_start_off) |
CAS_BASE(TX_DESC_CSUM_STUFF, csum_stuff_off);
}
entry = cp->tx_new[ring];
cp->tx_skbs[ring][entry] = skb;
nr_frags = skb_shinfo(skb)->nr_frags;
len = skb_headlen(skb);
mapping = pci_map_page(cp->pdev, virt_to_page(skb->data),
offset_in_page(skb->data), len,
PCI_DMA_TODEVICE);
tentry = entry;
tabort = cas_calc_tabort(cp, (unsigned long) skb->data, len);
if (unlikely(tabort)) {
/* NOTE: len is always > tabort */
cas_write_txd(cp, ring, entry, mapping, len - tabort,
ctrl | TX_DESC_SOF, 0);
entry = TX_DESC_NEXT(ring, entry);
skb_copy_from_linear_data_offset(skb, len - tabort,
tx_tiny_buf(cp, ring, entry), tabort);
mapping = tx_tiny_map(cp, ring, entry, tentry);
cas_write_txd(cp, ring, entry, mapping, tabort, ctrl,
(nr_frags == 0));
} else {
cas_write_txd(cp, ring, entry, mapping, len, ctrl |
TX_DESC_SOF, (nr_frags == 0));
}
entry = TX_DESC_NEXT(ring, entry);
for (frag = 0; frag < nr_frags; frag++) {
skb_frag_t *fragp = &skb_shinfo(skb)->frags[frag];
len = fragp->size;
mapping = pci_map_page(cp->pdev, fragp->page,
fragp->page_offset, len,
PCI_DMA_TODEVICE);
tabort = cas_calc_tabort(cp, fragp->page_offset, len);
if (unlikely(tabort)) {
void *addr;
/* NOTE: len is always > tabort */
cas_write_txd(cp, ring, entry, mapping, len - tabort,
ctrl, 0);
entry = TX_DESC_NEXT(ring, entry);
addr = cas_page_map(fragp->page);
memcpy(tx_tiny_buf(cp, ring, entry),
addr + fragp->page_offset + len - tabort,
tabort);
cas_page_unmap(addr);
mapping = tx_tiny_map(cp, ring, entry, tentry);
len = tabort;
}
cas_write_txd(cp, ring, entry, mapping, len, ctrl,
(frag + 1 == nr_frags));
entry = TX_DESC_NEXT(ring, entry);
}
cp->tx_new[ring] = entry;
if (TX_BUFFS_AVAIL(cp, ring) <= CAS_TABORT(cp)*(MAX_SKB_FRAGS + 1))
netif_stop_queue(dev);
if (netif_msg_tx_queued(cp))
printk(KERN_DEBUG "%s: tx[%d] queued, slot %d, skblen %d, "
"avail %d\n",
dev->name, ring, entry, skb->len,
TX_BUFFS_AVAIL(cp, ring));
writel(entry, cp->regs + REG_TX_KICKN(ring));
spin_unlock_irqrestore(&cp->tx_lock[ring], flags);
return 0;
}
static int cas_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
/* this is only used as a load-balancing hint, so it doesn't
* need to be SMP safe
*/
static int ring;
if (skb_padto(skb, cp->min_frame_size))
return 0;
/* XXX: we need some higher-level QoS hooks to steer packets to
* individual queues.
*/
if (cas_xmit_tx_ringN(cp, ring++ & N_TX_RINGS_MASK, skb))
return NETDEV_TX_BUSY;
dev->trans_start = jiffies;
return 0;
}
static void cas_init_tx_dma(struct cas *cp)
{
u64 desc_dma = cp->block_dvma;
unsigned long off;
u32 val;
int i;
/* set up tx completion writeback registers. must be 8-byte aligned */
#ifdef USE_TX_COMPWB
off = offsetof(struct cas_init_block, tx_compwb);
writel((desc_dma + off) >> 32, cp->regs + REG_TX_COMPWB_DB_HI);
writel((desc_dma + off) & 0xffffffff, cp->regs + REG_TX_COMPWB_DB_LOW);
#endif
/* enable completion writebacks, enable paced mode,
* disable read pipe, and disable pre-interrupt compwbs
*/
val = TX_CFG_COMPWB_Q1 | TX_CFG_COMPWB_Q2 |
TX_CFG_COMPWB_Q3 | TX_CFG_COMPWB_Q4 |
TX_CFG_DMA_RDPIPE_DIS | TX_CFG_PACED_MODE |
TX_CFG_INTR_COMPWB_DIS;
/* write out tx ring info and tx desc bases */
for (i = 0; i < MAX_TX_RINGS; i++) {
off = (unsigned long) cp->init_txds[i] -
(unsigned long) cp->init_block;
val |= CAS_TX_RINGN_BASE(i);
writel((desc_dma + off) >> 32, cp->regs + REG_TX_DBN_HI(i));
writel((desc_dma + off) & 0xffffffff, cp->regs +
REG_TX_DBN_LOW(i));
/* don't zero out the kick register here as the system
* will wedge
*/
}
writel(val, cp->regs + REG_TX_CFG);
/* program max burst sizes. these numbers should be different
* if doing QoS.
*/
#ifdef USE_QOS
writel(0x800, cp->regs + REG_TX_MAXBURST_0);
writel(0x1600, cp->regs + REG_TX_MAXBURST_1);
writel(0x2400, cp->regs + REG_TX_MAXBURST_2);
writel(0x4800, cp->regs + REG_TX_MAXBURST_3);
#else
writel(0x800, cp->regs + REG_TX_MAXBURST_0);
writel(0x800, cp->regs + REG_TX_MAXBURST_1);
writel(0x800, cp->regs + REG_TX_MAXBURST_2);
writel(0x800, cp->regs + REG_TX_MAXBURST_3);
#endif
}
/* Must be invoked under cp->lock. */
static inline void cas_init_dma(struct cas *cp)
{
cas_init_tx_dma(cp);
cas_init_rx_dma(cp);
}
/* Must be invoked under cp->lock. */
static u32 cas_setup_multicast(struct cas *cp)
{
u32 rxcfg = 0;
int i;
if (cp->dev->flags & IFF_PROMISC) {
rxcfg |= MAC_RX_CFG_PROMISC_EN;
} else if (cp->dev->flags & IFF_ALLMULTI) {
for (i=0; i < 16; i++)
writel(0xFFFF, cp->regs + REG_MAC_HASH_TABLEN(i));
rxcfg |= MAC_RX_CFG_HASH_FILTER_EN;
} else {
u16 hash_table[16];
u32 crc;
struct dev_mc_list *dmi = cp->dev->mc_list;
int i;
/* use the alternate mac address registers for the
* first 15 multicast addresses
*/
for (i = 1; i <= CAS_MC_EXACT_MATCH_SIZE; i++) {
if (!dmi) {
writel(0x0, cp->regs + REG_MAC_ADDRN(i*3 + 0));
writel(0x0, cp->regs + REG_MAC_ADDRN(i*3 + 1));
writel(0x0, cp->regs + REG_MAC_ADDRN(i*3 + 2));
continue;
}
writel((dmi->dmi_addr[4] << 8) | dmi->dmi_addr[5],
cp->regs + REG_MAC_ADDRN(i*3 + 0));
writel((dmi->dmi_addr[2] << 8) | dmi->dmi_addr[3],
cp->regs + REG_MAC_ADDRN(i*3 + 1));
writel((dmi->dmi_addr[0] << 8) | dmi->dmi_addr[1],
cp->regs + REG_MAC_ADDRN(i*3 + 2));
dmi = dmi->next;
}
/* use hw hash table for the next series of
* multicast addresses
*/
memset(hash_table, 0, sizeof(hash_table));
while (dmi) {
crc = ether_crc_le(ETH_ALEN, dmi->dmi_addr);
crc >>= 24;
hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
dmi = dmi->next;
}
for (i=0; i < 16; i++)
writel(hash_table[i], cp->regs +
REG_MAC_HASH_TABLEN(i));
rxcfg |= MAC_RX_CFG_HASH_FILTER_EN;
}
return rxcfg;
}
/* must be invoked under cp->stat_lock[N_TX_RINGS] */
static void cas_clear_mac_err(struct cas *cp)
{
writel(0, cp->regs + REG_MAC_COLL_NORMAL);
writel(0, cp->regs + REG_MAC_COLL_FIRST);
writel(0, cp->regs + REG_MAC_COLL_EXCESS);
writel(0, cp->regs + REG_MAC_COLL_LATE);
writel(0, cp->regs + REG_MAC_TIMER_DEFER);
writel(0, cp->regs + REG_MAC_ATTEMPTS_PEAK);
writel(0, cp->regs + REG_MAC_RECV_FRAME);
writel(0, cp->regs + REG_MAC_LEN_ERR);
writel(0, cp->regs + REG_MAC_ALIGN_ERR);
writel(0, cp->regs + REG_MAC_FCS_ERR);
writel(0, cp->regs + REG_MAC_RX_CODE_ERR);
}
static void cas_mac_reset(struct cas *cp)
{
int i;
/* do both TX and RX reset */
writel(0x1, cp->regs + REG_MAC_TX_RESET);
writel(0x1, cp->regs + REG_MAC_RX_RESET);
/* wait for TX */
i = STOP_TRIES;
while (i-- > 0) {
if (readl(cp->regs + REG_MAC_TX_RESET) == 0)
break;
udelay(10);
}
/* wait for RX */
i = STOP_TRIES;
while (i-- > 0) {
if (readl(cp->regs + REG_MAC_RX_RESET) == 0)
break;
udelay(10);
}
if (readl(cp->regs + REG_MAC_TX_RESET) |
readl(cp->regs + REG_MAC_RX_RESET))
printk(KERN_ERR "%s: mac tx[%d]/rx[%d] reset failed [%08x]\n",
cp->dev->name, readl(cp->regs + REG_MAC_TX_RESET),
readl(cp->regs + REG_MAC_RX_RESET),
readl(cp->regs + REG_MAC_STATE_MACHINE));
}
/* Must be invoked under cp->lock. */
static void cas_init_mac(struct cas *cp)
{
unsigned char *e = &cp->dev->dev_addr[0];
int i;
#ifdef CONFIG_CASSINI_MULTICAST_REG_WRITE
u32 rxcfg;
#endif
cas_mac_reset(cp);
/* setup core arbitration weight register */
writel(CAWR_RR_DIS, cp->regs + REG_CAWR);
/* XXX Use pci_dma_burst_advice() */
#if !defined(CONFIG_SPARC64) && !defined(CONFIG_ALPHA)
/* set the infinite burst register for chips that don't have
* pci issues.
*/
if ((cp->cas_flags & CAS_FLAG_TARGET_ABORT) == 0)
writel(INF_BURST_EN, cp->regs + REG_INF_BURST);
#endif
writel(0x1BF0, cp->regs + REG_MAC_SEND_PAUSE);
writel(0x00, cp->regs + REG_MAC_IPG0);
writel(0x08, cp->regs + REG_MAC_IPG1);
writel(0x04, cp->regs + REG_MAC_IPG2);
/* change later for 802.3z */
writel(0x40, cp->regs + REG_MAC_SLOT_TIME);
/* min frame + FCS */
writel(ETH_ZLEN + 4, cp->regs + REG_MAC_FRAMESIZE_MIN);
/* Ethernet payload + header + FCS + optional VLAN tag. NOTE: we
* specify the maximum frame size to prevent RX tag errors on
* oversized frames.
*/
writel(CAS_BASE(MAC_FRAMESIZE_MAX_BURST, 0x2000) |
CAS_BASE(MAC_FRAMESIZE_MAX_FRAME,
(CAS_MAX_MTU + ETH_HLEN + 4 + 4)),
cp->regs + REG_MAC_FRAMESIZE_MAX);
/* NOTE: crc_size is used as a surrogate for half-duplex.
* workaround saturn half-duplex issue by increasing preamble
* size to 65 bytes.
*/
if ((cp->cas_flags & CAS_FLAG_SATURN) && cp->crc_size)
writel(0x41, cp->regs + REG_MAC_PA_SIZE);
else
writel(0x07, cp->regs + REG_MAC_PA_SIZE);
writel(0x04, cp->regs + REG_MAC_JAM_SIZE);
writel(0x10, cp->regs + REG_MAC_ATTEMPT_LIMIT);
writel(0x8808, cp->regs + REG_MAC_CTRL_TYPE);
writel((e[5] | (e[4] << 8)) & 0x3ff, cp->regs + REG_MAC_RANDOM_SEED);
writel(0, cp->regs + REG_MAC_ADDR_FILTER0);
writel(0, cp->regs + REG_MAC_ADDR_FILTER1);
writel(0, cp->regs + REG_MAC_ADDR_FILTER2);
writel(0, cp->regs + REG_MAC_ADDR_FILTER2_1_MASK);
writel(0, cp->regs + REG_MAC_ADDR_FILTER0_MASK);
/* setup mac address in perfect filter array */
for (i = 0; i < 45; i++)
writel(0x0, cp->regs + REG_MAC_ADDRN(i));
writel((e[4] << 8) | e[5], cp->regs + REG_MAC_ADDRN(0));
writel((e[2] << 8) | e[3], cp->regs + REG_MAC_ADDRN(1));
writel((e[0] << 8) | e[1], cp->regs + REG_MAC_ADDRN(2));
writel(0x0001, cp->regs + REG_MAC_ADDRN(42));
writel(0xc200, cp->regs + REG_MAC_ADDRN(43));
writel(0x0180, cp->regs + REG_MAC_ADDRN(44));
#ifndef CONFIG_CASSINI_MULTICAST_REG_WRITE
cp->mac_rx_cfg = cas_setup_multicast(cp);
#else
/* WTZ: Do what Adrian did in cas_set_multicast. Doing
* a writel does not seem to be necessary because Cassini
* seems to preserve the configuration when we do the reset.
* If the chip is in trouble, though, it is not clear if we
* can really count on this behavior. cas_set_multicast uses
* spin_lock_irqsave, but we are called only in cas_init_hw and
* cas_init_hw is protected by cas_lock_all, which calls
* spin_lock_irq (so it doesn't need to save the flags, and
* we should be OK for the writel, as that is the only
* difference).
*/
cp->mac_rx_cfg = rxcfg = cas_setup_multicast(cp);
writel(rxcfg, cp->regs + REG_MAC_RX_CFG);
#endif
spin_lock(&cp->stat_lock[N_TX_RINGS]);
cas_clear_mac_err(cp);
spin_unlock(&cp->stat_lock[N_TX_RINGS]);
/* Setup MAC interrupts. We want to get all of the interesting
* counter expiration events, but we do not want to hear about
* normal rx/tx as the DMA engine tells us that.
*/
writel(MAC_TX_FRAME_XMIT, cp->regs + REG_MAC_TX_MASK);
writel(MAC_RX_FRAME_RECV, cp->regs + REG_MAC_RX_MASK);
/* Don't enable even the PAUSE interrupts for now, we
* make no use of those events other than to record them.
*/
writel(0xffffffff, cp->regs + REG_MAC_CTRL_MASK);
}
/* Must be invoked under cp->lock. */
static void cas_init_pause_thresholds(struct cas *cp)
{
/* Calculate pause thresholds. Setting the OFF threshold to the
* full RX fifo size effectively disables PAUSE generation
*/
if (cp->rx_fifo_size <= (2 * 1024)) {
cp->rx_pause_off = cp->rx_pause_on = cp->rx_fifo_size;
} else {
int max_frame = (cp->dev->mtu + ETH_HLEN + 4 + 4 + 64) & ~63;
if (max_frame * 3 > cp->rx_fifo_size) {
cp->rx_pause_off = 7104;
cp->rx_pause_on = 960;
} else {
int off = (cp->rx_fifo_size - (max_frame * 2));
int on = off - max_frame;
cp->rx_pause_off = off;
cp->rx_pause_on = on;
}
}
}
static int cas_vpd_match(const void __iomem *p, const char *str)
{
int len = strlen(str) + 1;
int i;
for (i = 0; i < len; i++) {
if (readb(p + i) != str[i])
return 0;
}
return 1;
}
/* get the mac address by reading the vpd information in the rom.
* also get the phy type and determine if there's an entropy generator.
* NOTE: this is a bit convoluted for the following reasons:
* 1) vpd info has order-dependent mac addresses for multinic cards
* 2) the only way to determine the nic order is to use the slot
* number.
* 3) fiber cards don't have bridges, so their slot numbers don't
* mean anything.
* 4) we don't actually know we have a fiber card until after
* the mac addresses are parsed.
*/
static int cas_get_vpd_info(struct cas *cp, unsigned char *dev_addr,
const int offset)
{
void __iomem *p = cp->regs + REG_EXPANSION_ROM_RUN_START;
void __iomem *base, *kstart;
int i, len;
int found = 0;
#define VPD_FOUND_MAC 0x01
#define VPD_FOUND_PHY 0x02
int phy_type = CAS_PHY_MII_MDIO0; /* default phy type */
int mac_off = 0;
/* give us access to the PROM */
writel(BIM_LOCAL_DEV_PROM | BIM_LOCAL_DEV_PAD,
cp->regs + REG_BIM_LOCAL_DEV_EN);
/* check for an expansion rom */
if (readb(p) != 0x55 || readb(p + 1) != 0xaa)
goto use_random_mac_addr;
/* search for beginning of vpd */
base = NULL;
for (i = 2; i < EXPANSION_ROM_SIZE; i++) {
/* check for PCIR */
if ((readb(p + i + 0) == 0x50) &&
(readb(p + i + 1) == 0x43) &&
(readb(p + i + 2) == 0x49) &&
(readb(p + i + 3) == 0x52)) {
base = p + (readb(p + i + 8) |
(readb(p + i + 9) << 8));
break;
}
}
if (!base || (readb(base) != 0x82))
goto use_random_mac_addr;
i = (readb(base + 1) | (readb(base + 2) << 8)) + 3;
while (i < EXPANSION_ROM_SIZE) {
if (readb(base + i) != 0x90) /* no vpd found */
goto use_random_mac_addr;
/* found a vpd field */
len = readb(base + i + 1) | (readb(base + i + 2) << 8);
/* extract keywords */
kstart = base + i + 3;
p = kstart;
while ((p - kstart) < len) {
int klen = readb(p + 2);
int j;
char type;
p += 3;
/* look for the following things:
* -- correct length == 29
* 3 (type) + 2 (size) +
* 18 (strlen("local-mac-address") + 1) +
* 6 (mac addr)
* -- VPD Instance 'I'
* -- VPD Type Bytes 'B'
* -- VPD data length == 6
* -- property string == local-mac-address
*
* -- correct length == 24
* 3 (type) + 2 (size) +
* 12 (strlen("entropy-dev") + 1) +
* 7 (strlen("vms110") + 1)
* -- VPD Instance 'I'
* -- VPD Type String 'B'
* -- VPD data length == 7
* -- property string == entropy-dev
*
* -- correct length == 18
* 3 (type) + 2 (size) +
* 9 (strlen("phy-type") + 1) +
* 4 (strlen("pcs") + 1)
* -- VPD Instance 'I'
* -- VPD Type String 'S'
* -- VPD data length == 4
* -- property string == phy-type
*
* -- correct length == 23
* 3 (type) + 2 (size) +
* 14 (strlen("phy-interface") + 1) +
* 4 (strlen("pcs") + 1)
* -- VPD Instance 'I'
* -- VPD Type String 'S'
* -- VPD data length == 4
* -- property string == phy-interface
*/
if (readb(p) != 'I')
goto next;
/* finally, check string and length */
type = readb(p + 3);
if (type == 'B') {
if ((klen == 29) && readb(p + 4) == 6 &&
cas_vpd_match(p + 5,
"local-mac-address")) {
if (mac_off++ > offset)
goto next;
/* set mac address */
for (j = 0; j < 6; j++)
dev_addr[j] =
readb(p + 23 + j);
goto found_mac;
}
}
if (type != 'S')
goto next;
#ifdef USE_ENTROPY_DEV
if ((klen == 24) &&
cas_vpd_match(p + 5, "entropy-dev") &&
cas_vpd_match(p + 17, "vms110")) {
cp->cas_flags |= CAS_FLAG_ENTROPY_DEV;
goto next;
}
#endif
if (found & VPD_FOUND_PHY)
goto next;
if ((klen == 18) && readb(p + 4) == 4 &&
cas_vpd_match(p + 5, "phy-type")) {
if (cas_vpd_match(p + 14, "pcs")) {
phy_type = CAS_PHY_SERDES;
goto found_phy;
}
}
if ((klen == 23) && readb(p + 4) == 4 &&
cas_vpd_match(p + 5, "phy-interface")) {
if (cas_vpd_match(p + 19, "pcs")) {
phy_type = CAS_PHY_SERDES;
goto found_phy;
}
}
found_mac:
found |= VPD_FOUND_MAC;
goto next;
found_phy:
found |= VPD_FOUND_PHY;
next:
p += klen;
}
i += len + 3;
}
use_random_mac_addr:
if (found & VPD_FOUND_MAC)
goto done;
/* Sun MAC prefix then 3 random bytes. */
printk(PFX "MAC address not found in ROM VPD\n");
dev_addr[0] = 0x08;
dev_addr[1] = 0x00;
dev_addr[2] = 0x20;
get_random_bytes(dev_addr + 3, 3);
done:
writel(0, cp->regs + REG_BIM_LOCAL_DEV_EN);
return phy_type;
}
/* check pci invariants */
static void cas_check_pci_invariants(struct cas *cp)
{
struct pci_dev *pdev = cp->pdev;
cp->cas_flags = 0;
if ((pdev->vendor == PCI_VENDOR_ID_SUN) &&
(pdev->device == PCI_DEVICE_ID_SUN_CASSINI)) {
if (pdev->revision >= CAS_ID_REVPLUS)
cp->cas_flags |= CAS_FLAG_REG_PLUS;
if (pdev->revision < CAS_ID_REVPLUS02u)
cp->cas_flags |= CAS_FLAG_TARGET_ABORT;
/* Original Cassini supports HW CSUM, but it's not
* enabled by default as it can trigger TX hangs.
*/
if (pdev->revision < CAS_ID_REV2)
cp->cas_flags |= CAS_FLAG_NO_HW_CSUM;
} else {
/* Only sun has original cassini chips. */
cp->cas_flags |= CAS_FLAG_REG_PLUS;
/* We use a flag because the same phy might be externally
* connected.
*/
if ((pdev->vendor == PCI_VENDOR_ID_NS) &&
(pdev->device == PCI_DEVICE_ID_NS_SATURN))
cp->cas_flags |= CAS_FLAG_SATURN;
}
}
static int cas_check_invariants(struct cas *cp)
{
struct pci_dev *pdev = cp->pdev;
u32 cfg;
int i;
/* get page size for rx buffers. */
cp->page_order = 0;
#ifdef USE_PAGE_ORDER
if (PAGE_SHIFT < CAS_JUMBO_PAGE_SHIFT) {
/* see if we can allocate larger pages */
struct page *page = alloc_pages(GFP_ATOMIC,
CAS_JUMBO_PAGE_SHIFT -
PAGE_SHIFT);
if (page) {
__free_pages(page, CAS_JUMBO_PAGE_SHIFT - PAGE_SHIFT);
cp->page_order = CAS_JUMBO_PAGE_SHIFT - PAGE_SHIFT;
} else {
printk(PFX "MTU limited to %d bytes\n", CAS_MAX_MTU);
}
}
#endif
cp->page_size = (PAGE_SIZE << cp->page_order);
/* Fetch the FIFO configurations. */
cp->tx_fifo_size = readl(cp->regs + REG_TX_FIFO_SIZE) * 64;
cp->rx_fifo_size = RX_FIFO_SIZE;
/* finish phy determination. MDIO1 takes precedence over MDIO0 if
* they're both connected.
*/
cp->phy_type = cas_get_vpd_info(cp, cp->dev->dev_addr,
PCI_SLOT(pdev->devfn));
if (cp->phy_type & CAS_PHY_SERDES) {
cp->cas_flags |= CAS_FLAG_1000MB_CAP;
return 0; /* no more checking needed */
}
/* MII */
cfg = readl(cp->regs + REG_MIF_CFG);
if (cfg & MIF_CFG_MDIO_1) {
cp->phy_type = CAS_PHY_MII_MDIO1;
} else if (cfg & MIF_CFG_MDIO_0) {
cp->phy_type = CAS_PHY_MII_MDIO0;
}
cas_mif_poll(cp, 0);
writel(PCS_DATAPATH_MODE_MII, cp->regs + REG_PCS_DATAPATH_MODE);
for (i = 0; i < 32; i++) {
u32 phy_id;
int j;
for (j = 0; j < 3; j++) {
cp->phy_addr = i;
phy_id = cas_phy_read(cp, MII_PHYSID1) << 16;
phy_id |= cas_phy_read(cp, MII_PHYSID2);
if (phy_id && (phy_id != 0xFFFFFFFF)) {
cp->phy_id = phy_id;
goto done;
}
}
}
printk(KERN_ERR PFX "MII phy did not respond [%08x]\n",
readl(cp->regs + REG_MIF_STATE_MACHINE));
return -1;
done:
/* see if we can do gigabit */
cfg = cas_phy_read(cp, MII_BMSR);
if ((cfg & CAS_BMSR_1000_EXTEND) &&
cas_phy_read(cp, CAS_MII_1000_EXTEND))
cp->cas_flags |= CAS_FLAG_1000MB_CAP;
return 0;
}
/* Must be invoked under cp->lock. */
static inline void cas_start_dma(struct cas *cp)
{
int i;
u32 val;
int txfailed = 0;
/* enable dma */
val = readl(cp->regs + REG_TX_CFG) | TX_CFG_DMA_EN;
writel(val, cp->regs + REG_TX_CFG);
val = readl(cp->regs + REG_RX_CFG) | RX_CFG_DMA_EN;
writel(val, cp->regs + REG_RX_CFG);
/* enable the mac */
val = readl(cp->regs + REG_MAC_TX_CFG) | MAC_TX_CFG_EN;
writel(val, cp->regs + REG_MAC_TX_CFG);
val = readl(cp->regs + REG_MAC_RX_CFG) | MAC_RX_CFG_EN;
writel(val, cp->regs + REG_MAC_RX_CFG);
i = STOP_TRIES;
while (i-- > 0) {
val = readl(cp->regs + REG_MAC_TX_CFG);
if ((val & MAC_TX_CFG_EN))
break;
udelay(10);
}
if (i < 0) txfailed = 1;
i = STOP_TRIES;
while (i-- > 0) {
val = readl(cp->regs + REG_MAC_RX_CFG);
if ((val & MAC_RX_CFG_EN)) {
if (txfailed) {
printk(KERN_ERR
"%s: enabling mac failed [tx:%08x:%08x].\n",
cp->dev->name,
readl(cp->regs + REG_MIF_STATE_MACHINE),
readl(cp->regs + REG_MAC_STATE_MACHINE));
}
goto enable_rx_done;
}
udelay(10);
}
printk(KERN_ERR "%s: enabling mac failed [%s:%08x:%08x].\n",
cp->dev->name,
(txfailed? "tx,rx":"rx"),
readl(cp->regs + REG_MIF_STATE_MACHINE),
readl(cp->regs + REG_MAC_STATE_MACHINE));
enable_rx_done:
cas_unmask_intr(cp); /* enable interrupts */
writel(RX_DESC_RINGN_SIZE(0) - 4, cp->regs + REG_RX_KICK);
writel(0, cp->regs + REG_RX_COMP_TAIL);
if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
if (N_RX_DESC_RINGS > 1)
writel(RX_DESC_RINGN_SIZE(1) - 4,
cp->regs + REG_PLUS_RX_KICK1);
for (i = 1; i < N_RX_COMP_RINGS; i++)
writel(0, cp->regs + REG_PLUS_RX_COMPN_TAIL(i));
}
}
/* Must be invoked under cp->lock. */
static void cas_read_pcs_link_mode(struct cas *cp, int *fd, int *spd,
int *pause)
{
u32 val = readl(cp->regs + REG_PCS_MII_LPA);
*fd = (val & PCS_MII_LPA_FD) ? 1 : 0;
*pause = (val & PCS_MII_LPA_SYM_PAUSE) ? 0x01 : 0x00;
if (val & PCS_MII_LPA_ASYM_PAUSE)
*pause |= 0x10;
*spd = 1000;
}
/* Must be invoked under cp->lock. */
static void cas_read_mii_link_mode(struct cas *cp, int *fd, int *spd,
int *pause)
{
u32 val;
*fd = 0;
*spd = 10;
*pause = 0;
/* use GMII registers */
val = cas_phy_read(cp, MII_LPA);
if (val & CAS_LPA_PAUSE)
*pause = 0x01;
if (val & CAS_LPA_ASYM_PAUSE)
*pause |= 0x10;
if (val & LPA_DUPLEX)
*fd = 1;
if (val & LPA_100)
*spd = 100;
if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
val = cas_phy_read(cp, CAS_MII_1000_STATUS);
if (val & (CAS_LPA_1000FULL | CAS_LPA_1000HALF))
*spd = 1000;
if (val & CAS_LPA_1000FULL)
*fd = 1;
}
}
/* A link-up condition has occurred, initialize and enable the
* rest of the chip.
*
* Must be invoked under cp->lock.
*/
static void cas_set_link_modes(struct cas *cp)
{
u32 val;
int full_duplex, speed, pause;
full_duplex = 0;
speed = 10;
pause = 0;
if (CAS_PHY_MII(cp->phy_type)) {
cas_mif_poll(cp, 0);
val = cas_phy_read(cp, MII_BMCR);
if (val & BMCR_ANENABLE) {
cas_read_mii_link_mode(cp, &full_duplex, &speed,
&pause);
} else {
if (val & BMCR_FULLDPLX)
full_duplex = 1;
if (val & BMCR_SPEED100)
speed = 100;
else if (val & CAS_BMCR_SPEED1000)
speed = (cp->cas_flags & CAS_FLAG_1000MB_CAP) ?
1000 : 100;
}
cas_mif_poll(cp, 1);
} else {
val = readl(cp->regs + REG_PCS_MII_CTRL);
cas_read_pcs_link_mode(cp, &full_duplex, &speed, &pause);
if ((val & PCS_MII_AUTONEG_EN) == 0) {
if (val & PCS_MII_CTRL_DUPLEX)
full_duplex = 1;
}
}
if (netif_msg_link(cp))
printk(KERN_INFO "%s: Link up at %d Mbps, %s-duplex.\n",
cp->dev->name, speed, (full_duplex ? "full" : "half"));
val = MAC_XIF_TX_MII_OUTPUT_EN | MAC_XIF_LINK_LED;
if (CAS_PHY_MII(cp->phy_type)) {
val |= MAC_XIF_MII_BUFFER_OUTPUT_EN;
if (!full_duplex)
val |= MAC_XIF_DISABLE_ECHO;
}
if (full_duplex)
val |= MAC_XIF_FDPLX_LED;
if (speed == 1000)
val |= MAC_XIF_GMII_MODE;
writel(val, cp->regs + REG_MAC_XIF_CFG);
/* deal with carrier and collision detect. */
val = MAC_TX_CFG_IPG_EN;
if (full_duplex) {
val |= MAC_TX_CFG_IGNORE_CARRIER;
val |= MAC_TX_CFG_IGNORE_COLL;
} else {
#ifndef USE_CSMA_CD_PROTO
val |= MAC_TX_CFG_NEVER_GIVE_UP_EN;
val |= MAC_TX_CFG_NEVER_GIVE_UP_LIM;
#endif
}
/* val now set up for REG_MAC_TX_CFG */
/* If gigabit and half-duplex, enable carrier extension
* mode. increase slot time to 512 bytes as well.
* else, disable it and make sure slot time is 64 bytes.
* also activate checksum bug workaround
*/
if ((speed == 1000) && !full_duplex) {
writel(val | MAC_TX_CFG_CARRIER_EXTEND,
cp->regs + REG_MAC_TX_CFG);
val = readl(cp->regs + REG_MAC_RX_CFG);
val &= ~MAC_RX_CFG_STRIP_FCS; /* checksum workaround */
writel(val | MAC_RX_CFG_CARRIER_EXTEND,
cp->regs + REG_MAC_RX_CFG);
writel(0x200, cp->regs + REG_MAC_SLOT_TIME);
cp->crc_size = 4;
/* minimum size gigabit frame at half duplex */
cp->min_frame_size = CAS_1000MB_MIN_FRAME;
} else {
writel(val, cp->regs + REG_MAC_TX_CFG);
/* checksum bug workaround. don't strip FCS when in
* half-duplex mode
*/
val = readl(cp->regs + REG_MAC_RX_CFG);
if (full_duplex) {
val |= MAC_RX_CFG_STRIP_FCS;
cp->crc_size = 0;
cp->min_frame_size = CAS_MIN_MTU;
} else {
val &= ~MAC_RX_CFG_STRIP_FCS;
cp->crc_size = 4;
cp->min_frame_size = CAS_MIN_FRAME;
}
writel(val & ~MAC_RX_CFG_CARRIER_EXTEND,
cp->regs + REG_MAC_RX_CFG);
writel(0x40, cp->regs + REG_MAC_SLOT_TIME);
}
if (netif_msg_link(cp)) {
if (pause & 0x01) {
printk(KERN_INFO "%s: Pause is enabled "
"(rxfifo: %d off: %d on: %d)\n",
cp->dev->name,
cp->rx_fifo_size,
cp->rx_pause_off,
cp->rx_pause_on);
} else if (pause & 0x10) {
printk(KERN_INFO "%s: TX pause enabled\n",
cp->dev->name);
} else {
printk(KERN_INFO "%s: Pause is disabled\n",
cp->dev->name);
}
}
val = readl(cp->regs + REG_MAC_CTRL_CFG);
val &= ~(MAC_CTRL_CFG_SEND_PAUSE_EN | MAC_CTRL_CFG_RECV_PAUSE_EN);
if (pause) { /* symmetric or asymmetric pause */
val |= MAC_CTRL_CFG_SEND_PAUSE_EN;
if (pause & 0x01) { /* symmetric pause */
val |= MAC_CTRL_CFG_RECV_PAUSE_EN;
}
}
writel(val, cp->regs + REG_MAC_CTRL_CFG);
cas_start_dma(cp);
}
/* Must be invoked under cp->lock. */
static void cas_init_hw(struct cas *cp, int restart_link)
{
if (restart_link)
cas_phy_init(cp);
cas_init_pause_thresholds(cp);
cas_init_mac(cp);
cas_init_dma(cp);
if (restart_link) {
/* Default aneg parameters */
cp->timer_ticks = 0;
cas_begin_auto_negotiation(cp, NULL);
} else if (cp->lstate == link_up) {
cas_set_link_modes(cp);
netif_carrier_on(cp->dev);
}
}
/* Must be invoked under cp->lock. on earlier cassini boards,
* SOFT_0 is tied to PCI reset. we use this to force a pci reset,
* let it settle out, and then restore pci state.
*/
static void cas_hard_reset(struct cas *cp)
{
writel(BIM_LOCAL_DEV_SOFT_0, cp->regs + REG_BIM_LOCAL_DEV_EN);
udelay(20);
pci_restore_state(cp->pdev);
}
static void cas_global_reset(struct cas *cp, int blkflag)
{
int limit;
/* issue a global reset. don't use RSTOUT. */
if (blkflag && !CAS_PHY_MII(cp->phy_type)) {
/* For PCS, when the blkflag is set, we should set the
* SW_REST_BLOCK_PCS_SLINK bit to prevent the results of
* the last autonegotiation from being cleared. We'll
* need some special handling if the chip is set into a
* loopback mode.
*/
writel((SW_RESET_TX | SW_RESET_RX | SW_RESET_BLOCK_PCS_SLINK),
cp->regs + REG_SW_RESET);
} else {
writel(SW_RESET_TX | SW_RESET_RX, cp->regs + REG_SW_RESET);
}
/* need to wait at least 3ms before polling register */
mdelay(3);
limit = STOP_TRIES;
while (limit-- > 0) {
u32 val = readl(cp->regs + REG_SW_RESET);
if ((val & (SW_RESET_TX | SW_RESET_RX)) == 0)
goto done;
udelay(10);
}
printk(KERN_ERR "%s: sw reset failed.\n", cp->dev->name);
done:
/* enable various BIM interrupts */
writel(BIM_CFG_DPAR_INTR_ENABLE | BIM_CFG_RMA_INTR_ENABLE |
BIM_CFG_RTA_INTR_ENABLE, cp->regs + REG_BIM_CFG);
/* clear out pci error status mask for handled errors.
* we don't deal with DMA counter overflows as they happen
* all the time.
*/
writel(0xFFFFFFFFU & ~(PCI_ERR_BADACK | PCI_ERR_DTRTO |
PCI_ERR_OTHER | PCI_ERR_BIM_DMA_WRITE |
PCI_ERR_BIM_DMA_READ), cp->regs +
REG_PCI_ERR_STATUS_MASK);
/* set up for MII by default to address mac rx reset timeout
* issue
*/
writel(PCS_DATAPATH_MODE_MII, cp->regs + REG_PCS_DATAPATH_MODE);
}
static void cas_reset(struct cas *cp, int blkflag)
{
u32 val;
cas_mask_intr(cp);
cas_global_reset(cp, blkflag);
cas_mac_reset(cp);
cas_entropy_reset(cp);
/* disable dma engines. */
val = readl(cp->regs + REG_TX_CFG);
val &= ~TX_CFG_DMA_EN;
writel(val, cp->regs + REG_TX_CFG);
val = readl(cp->regs + REG_RX_CFG);
val &= ~RX_CFG_DMA_EN;
writel(val, cp->regs + REG_RX_CFG);
/* program header parser */
if ((cp->cas_flags & CAS_FLAG_TARGET_ABORT) ||
(CAS_HP_ALT_FIRMWARE == cas_prog_null)) {
cas_load_firmware(cp, CAS_HP_FIRMWARE);
} else {
cas_load_firmware(cp, CAS_HP_ALT_FIRMWARE);
}
/* clear out error registers */
spin_lock(&cp->stat_lock[N_TX_RINGS]);
cas_clear_mac_err(cp);
spin_unlock(&cp->stat_lock[N_TX_RINGS]);
}
/* Shut down the chip, must be called with pm_mutex held. */
static void cas_shutdown(struct cas *cp)
{
unsigned long flags;
/* Make us not-running to avoid timers respawning */
cp->hw_running = 0;
del_timer_sync(&cp->link_timer);
/* Stop the reset task */
#if 0
while (atomic_read(&cp->reset_task_pending_mtu) ||
atomic_read(&cp->reset_task_pending_spare) ||
atomic_read(&cp->reset_task_pending_all))
schedule();
#else
while (atomic_read(&cp->reset_task_pending))
schedule();
#endif
/* Actually stop the chip */
cas_lock_all_save(cp, flags);
cas_reset(cp, 0);
if (cp->cas_flags & CAS_FLAG_SATURN)
cas_phy_powerdown(cp);
cas_unlock_all_restore(cp, flags);
}
static int cas_change_mtu(struct net_device *dev, int new_mtu)
{
struct cas *cp = netdev_priv(dev);
if (new_mtu < CAS_MIN_MTU || new_mtu > CAS_MAX_MTU)
return -EINVAL;
dev->mtu = new_mtu;
if (!netif_running(dev) || !netif_device_present(dev))
return 0;
/* let the reset task handle it */
#if 1
atomic_inc(&cp->reset_task_pending);
if ((cp->phy_type & CAS_PHY_SERDES)) {
atomic_inc(&cp->reset_task_pending_all);
} else {
atomic_inc(&cp->reset_task_pending_mtu);
}
schedule_work(&cp->reset_task);
#else
atomic_set(&cp->reset_task_pending, (cp->phy_type & CAS_PHY_SERDES) ?
CAS_RESET_ALL : CAS_RESET_MTU);
printk(KERN_ERR "reset called in cas_change_mtu\n");
schedule_work(&cp->reset_task);
#endif
flush_scheduled_work();
return 0;
}
static void cas_clean_txd(struct cas *cp, int ring)
{
struct cas_tx_desc *txd = cp->init_txds[ring];
struct sk_buff *skb, **skbs = cp->tx_skbs[ring];
u64 daddr, dlen;
int i, size;
size = TX_DESC_RINGN_SIZE(ring);
for (i = 0; i < size; i++) {
int frag;
if (skbs[i] == NULL)
continue;
skb = skbs[i];
skbs[i] = NULL;
for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) {
int ent = i & (size - 1);
/* first buffer is never a tiny buffer and so
* needs to be unmapped.
*/
daddr = le64_to_cpu(txd[ent].buffer);
dlen = CAS_VAL(TX_DESC_BUFLEN,
le64_to_cpu(txd[ent].control));
pci_unmap_page(cp->pdev, daddr, dlen,
PCI_DMA_TODEVICE);
if (frag != skb_shinfo(skb)->nr_frags) {
i++;
/* next buffer might by a tiny buffer.
* skip past it.
*/
ent = i & (size - 1);
if (cp->tx_tiny_use[ring][ent].used)
i++;
}
}
dev_kfree_skb_any(skb);
}
/* zero out tiny buf usage */
memset(cp->tx_tiny_use[ring], 0, size*sizeof(*cp->tx_tiny_use[ring]));
}
/* freed on close */
static inline void cas_free_rx_desc(struct cas *cp, int ring)
{
cas_page_t **page = cp->rx_pages[ring];
int i, size;
size = RX_DESC_RINGN_SIZE(ring);
for (i = 0; i < size; i++) {
if (page[i]) {
cas_page_free(cp, page[i]);
page[i] = NULL;
}
}
}
static void cas_free_rxds(struct cas *cp)
{
int i;
for (i = 0; i < N_RX_DESC_RINGS; i++)
cas_free_rx_desc(cp, i);
}
/* Must be invoked under cp->lock. */
static void cas_clean_rings(struct cas *cp)
{
int i;
/* need to clean all tx rings */
memset(cp->tx_old, 0, sizeof(*cp->tx_old)*N_TX_RINGS);
memset(cp->tx_new, 0, sizeof(*cp->tx_new)*N_TX_RINGS);
for (i = 0; i < N_TX_RINGS; i++)
cas_clean_txd(cp, i);
/* zero out init block */
memset(cp->init_block, 0, sizeof(struct cas_init_block));
cas_clean_rxds(cp);
cas_clean_rxcs(cp);
}
/* allocated on open */
static inline int cas_alloc_rx_desc(struct cas *cp, int ring)
{
cas_page_t **page = cp->rx_pages[ring];
int size, i = 0;
size = RX_DESC_RINGN_SIZE(ring);
for (i = 0; i < size; i++) {
if ((page[i] = cas_page_alloc(cp, GFP_KERNEL)) == NULL)
return -1;
}
return 0;
}
static int cas_alloc_rxds(struct cas *cp)
{
int i;
for (i = 0; i < N_RX_DESC_RINGS; i++) {
if (cas_alloc_rx_desc(cp, i) < 0) {
cas_free_rxds(cp);
return -1;
}
}
return 0;
}
static void cas_reset_task(struct work_struct *work)
{
struct cas *cp = container_of(work, struct cas, reset_task);
#if 0
int pending = atomic_read(&cp->reset_task_pending);
#else
int pending_all = atomic_read(&cp->reset_task_pending_all);
int pending_spare = atomic_read(&cp->reset_task_pending_spare);
int pending_mtu = atomic_read(&cp->reset_task_pending_mtu);
if (pending_all == 0 && pending_spare == 0 && pending_mtu == 0) {
/* We can have more tasks scheduled than actually
* needed.
*/
atomic_dec(&cp->reset_task_pending);
return;
}
#endif
/* The link went down, we reset the ring, but keep
* DMA stopped. Use this function for reset
* on error as well.
*/
if (cp->hw_running) {
unsigned long flags;
/* Make sure we don't get interrupts or tx packets */
netif_device_detach(cp->dev);
cas_lock_all_save(cp, flags);
if (cp->opened) {
/* We call cas_spare_recover when we call cas_open.
* but we do not initialize the lists cas_spare_recover
* uses until cas_open is called.
*/
cas_spare_recover(cp, GFP_ATOMIC);
}
#if 1
/* test => only pending_spare set */
if (!pending_all && !pending_mtu)
goto done;
#else
if (pending == CAS_RESET_SPARE)
goto done;
#endif
/* when pending == CAS_RESET_ALL, the following
* call to cas_init_hw will restart auto negotiation.
* Setting the second argument of cas_reset to
* !(pending == CAS_RESET_ALL) will set this argument
* to 1 (avoiding reinitializing the PHY for the normal
* PCS case) when auto negotiation is not restarted.
*/
#if 1
cas_reset(cp, !(pending_all > 0));
if (cp->opened)
cas_clean_rings(cp);
cas_init_hw(cp, (pending_all > 0));
#else
cas_reset(cp, !(pending == CAS_RESET_ALL));
if (cp->opened)
cas_clean_rings(cp);
cas_init_hw(cp, pending == CAS_RESET_ALL);
#endif
done:
cas_unlock_all_restore(cp, flags);
netif_device_attach(cp->dev);
}
#if 1
atomic_sub(pending_all, &cp->reset_task_pending_all);
atomic_sub(pending_spare, &cp->reset_task_pending_spare);
atomic_sub(pending_mtu, &cp->reset_task_pending_mtu);
atomic_dec(&cp->reset_task_pending);
#else
atomic_set(&cp->reset_task_pending, 0);
#endif
}
static void cas_link_timer(unsigned long data)
{
struct cas *cp = (struct cas *) data;
int mask, pending = 0, reset = 0;
unsigned long flags;
if (link_transition_timeout != 0 &&
cp->link_transition_jiffies_valid &&
((jiffies - cp->link_transition_jiffies) >
(link_transition_timeout))) {
/* One-second counter so link-down workaround doesn't
* cause resets to occur so fast as to fool the switch
* into thinking the link is down.
*/
cp->link_transition_jiffies_valid = 0;
}
if (!cp->hw_running)
return;
spin_lock_irqsave(&cp->lock, flags);
cas_lock_tx(cp);
cas_entropy_gather(cp);
/* If the link task is still pending, we just
* reschedule the link timer
*/
#if 1
if (atomic_read(&cp->reset_task_pending_all) ||
atomic_read(&cp->reset_task_pending_spare) ||
atomic_read(&cp->reset_task_pending_mtu))
goto done;
#else
if (atomic_read(&cp->reset_task_pending))
goto done;
#endif
/* check for rx cleaning */
if ((mask = (cp->cas_flags & CAS_FLAG_RXD_POST_MASK))) {
int i, rmask;
for (i = 0; i < MAX_RX_DESC_RINGS; i++) {
rmask = CAS_FLAG_RXD_POST(i);
if ((mask & rmask) == 0)
continue;
/* post_rxds will do a mod_timer */
if (cas_post_rxds_ringN(cp, i, cp->rx_last[i]) < 0) {
pending = 1;
continue;
}
cp->cas_flags &= ~rmask;
}
}
if (CAS_PHY_MII(cp->phy_type)) {
u16 bmsr;
cas_mif_poll(cp, 0);
bmsr = cas_phy_read(cp, MII_BMSR);
/* WTZ: Solaris driver reads this twice, but that
* may be due to the PCS case and the use of a
* common implementation. Read it twice here to be
* safe.
*/
bmsr = cas_phy_read(cp, MII_BMSR);
cas_mif_poll(cp, 1);
readl(cp->regs + REG_MIF_STATUS); /* avoid dups */
reset = cas_mii_link_check(cp, bmsr);
} else {
reset = cas_pcs_link_check(cp);
}
if (reset)
goto done;
/* check for tx state machine confusion */
if ((readl(cp->regs + REG_MAC_TX_STATUS) & MAC_TX_FRAME_XMIT) == 0) {
u32 val = readl(cp->regs + REG_MAC_STATE_MACHINE);
u32 wptr, rptr;
int tlm = CAS_VAL(MAC_SM_TLM, val);
if (((tlm == 0x5) || (tlm == 0x3)) &&
(CAS_VAL(MAC_SM_ENCAP_SM, val) == 0)) {
if (netif_msg_tx_err(cp))
printk(KERN_DEBUG "%s: tx err: "
"MAC_STATE[%08x]\n",
cp->dev->name, val);
reset = 1;
goto done;
}
val = readl(cp->regs + REG_TX_FIFO_PKT_CNT);
wptr = readl(cp->regs + REG_TX_FIFO_WRITE_PTR);
rptr = readl(cp->regs + REG_TX_FIFO_READ_PTR);
if ((val == 0) && (wptr != rptr)) {
if (netif_msg_tx_err(cp))
printk(KERN_DEBUG "%s: tx err: "
"TX_FIFO[%08x:%08x:%08x]\n",
cp->dev->name, val, wptr, rptr);
reset = 1;
}
if (reset)
cas_hard_reset(cp);
}
done:
if (reset) {
#if 1
atomic_inc(&cp->reset_task_pending);
atomic_inc(&cp->reset_task_pending_all);
schedule_work(&cp->reset_task);
#else
atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
printk(KERN_ERR "reset called in cas_link_timer\n");
schedule_work(&cp->reset_task);
#endif
}
if (!pending)
mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
cas_unlock_tx(cp);
spin_unlock_irqrestore(&cp->lock, flags);
}
/* tiny buffers are used to avoid target abort issues with
* older cassini's
*/
static void cas_tx_tiny_free(struct cas *cp)
{
struct pci_dev *pdev = cp->pdev;
int i;
for (i = 0; i < N_TX_RINGS; i++) {
if (!cp->tx_tiny_bufs[i])
continue;
pci_free_consistent(pdev, TX_TINY_BUF_BLOCK,
cp->tx_tiny_bufs[i],
cp->tx_tiny_dvma[i]);
cp->tx_tiny_bufs[i] = NULL;
}
}
static int cas_tx_tiny_alloc(struct cas *cp)
{
struct pci_dev *pdev = cp->pdev;
int i;
for (i = 0; i < N_TX_RINGS; i++) {
cp->tx_tiny_bufs[i] =
pci_alloc_consistent(pdev, TX_TINY_BUF_BLOCK,
&cp->tx_tiny_dvma[i]);
if (!cp->tx_tiny_bufs[i]) {
cas_tx_tiny_free(cp);
return -1;
}
}
return 0;
}
static int cas_open(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
int hw_was_up, err;
unsigned long flags;
mutex_lock(&cp->pm_mutex);
hw_was_up = cp->hw_running;
/* The power-management mutex protects the hw_running
* etc. state so it is safe to do this bit without cp->lock
*/
if (!cp->hw_running) {
/* Reset the chip */
cas_lock_all_save(cp, flags);
/* We set the second arg to cas_reset to zero
* because cas_init_hw below will have its second
* argument set to non-zero, which will force
* autonegotiation to start.
*/
cas_reset(cp, 0);
cp->hw_running = 1;
cas_unlock_all_restore(cp, flags);
}
if (cas_tx_tiny_alloc(cp) < 0)
return -ENOMEM;
/* alloc rx descriptors */
err = -ENOMEM;
if (cas_alloc_rxds(cp) < 0)
goto err_tx_tiny;
/* allocate spares */
cas_spare_init(cp);
cas_spare_recover(cp, GFP_KERNEL);
/* We can now request the interrupt as we know it's masked
* on the controller. cassini+ has up to 4 interrupts
* that can be used, but you need to do explicit pci interrupt
* mapping to expose them
*/
if (request_irq(cp->pdev->irq, cas_interrupt,
IRQF_SHARED, dev->name, (void *) dev)) {
printk(KERN_ERR "%s: failed to request irq !\n",
cp->dev->name);
err = -EAGAIN;
goto err_spare;
}
#ifdef USE_NAPI
napi_enable(&cp->napi);
#endif
/* init hw */
cas_lock_all_save(cp, flags);
cas_clean_rings(cp);
cas_init_hw(cp, !hw_was_up);
cp->opened = 1;
cas_unlock_all_restore(cp, flags);
netif_start_queue(dev);
mutex_unlock(&cp->pm_mutex);
return 0;
err_spare:
cas_spare_free(cp);
cas_free_rxds(cp);
err_tx_tiny:
cas_tx_tiny_free(cp);
mutex_unlock(&cp->pm_mutex);
return err;
}
static int cas_close(struct net_device *dev)
{
unsigned long flags;
struct cas *cp = netdev_priv(dev);
#ifdef USE_NAPI
napi_disable(&cp->napi);
#endif
/* Make sure we don't get distracted by suspend/resume */
mutex_lock(&cp->pm_mutex);
netif_stop_queue(dev);
/* Stop traffic, mark us closed */
cas_lock_all_save(cp, flags);
cp->opened = 0;
cas_reset(cp, 0);
cas_phy_init(cp);
cas_begin_auto_negotiation(cp, NULL);
cas_clean_rings(cp);
cas_unlock_all_restore(cp, flags);
free_irq(cp->pdev->irq, (void *) dev);
cas_spare_free(cp);
cas_free_rxds(cp);
cas_tx_tiny_free(cp);
mutex_unlock(&cp->pm_mutex);
return 0;
}
static struct {
const char name[ETH_GSTRING_LEN];
} ethtool_cassini_statnames[] = {
{"collisions"},
{"rx_bytes"},
{"rx_crc_errors"},
{"rx_dropped"},
{"rx_errors"},
{"rx_fifo_errors"},
{"rx_frame_errors"},
{"rx_length_errors"},
{"rx_over_errors"},
{"rx_packets"},
{"tx_aborted_errors"},
{"tx_bytes"},
{"tx_dropped"},
{"tx_errors"},
{"tx_fifo_errors"},
{"tx_packets"}
};
#define CAS_NUM_STAT_KEYS ARRAY_SIZE(ethtool_cassini_statnames)
static struct {
const int offsets; /* neg. values for 2nd arg to cas_read_phy */
} ethtool_register_table[] = {
{-MII_BMSR},
{-MII_BMCR},
{REG_CAWR},
{REG_INF_BURST},
{REG_BIM_CFG},
{REG_RX_CFG},
{REG_HP_CFG},
{REG_MAC_TX_CFG},
{REG_MAC_RX_CFG},
{REG_MAC_CTRL_CFG},
{REG_MAC_XIF_CFG},
{REG_MIF_CFG},
{REG_PCS_CFG},
{REG_SATURN_PCFG},
{REG_PCS_MII_STATUS},
{REG_PCS_STATE_MACHINE},
{REG_MAC_COLL_EXCESS},
{REG_MAC_COLL_LATE}
};
#define CAS_REG_LEN ARRAY_SIZE(ethtool_register_table)
#define CAS_MAX_REGS (sizeof (u32)*CAS_REG_LEN)
static void cas_read_regs(struct cas *cp, u8 *ptr, int len)
{
u8 *p;
int i;
unsigned long flags;
spin_lock_irqsave(&cp->lock, flags);
for (i = 0, p = ptr; i < len ; i ++, p += sizeof(u32)) {
u16 hval;
u32 val;
if (ethtool_register_table[i].offsets < 0) {
hval = cas_phy_read(cp,
-ethtool_register_table[i].offsets);
val = hval;
} else {
val= readl(cp->regs+ethtool_register_table[i].offsets);
}
memcpy(p, (u8 *)&val, sizeof(u32));
}
spin_unlock_irqrestore(&cp->lock, flags);
}
static struct net_device_stats *cas_get_stats(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
struct net_device_stats *stats = cp->net_stats;
unsigned long flags;
int i;
unsigned long tmp;
/* we collate all of the stats into net_stats[N_TX_RING] */
if (!cp->hw_running)
return stats + N_TX_RINGS;
/* collect outstanding stats */
/* WTZ: the Cassini spec gives these as 16 bit counters but
* stored in 32-bit words. Added a mask of 0xffff to be safe,
* in case the chip somehow puts any garbage in the other bits.
* Also, counter usage didn't seem to mach what Adrian did
* in the parts of the code that set these quantities. Made
* that consistent.
*/
spin_lock_irqsave(&cp->stat_lock[N_TX_RINGS], flags);
stats[N_TX_RINGS].rx_crc_errors +=
readl(cp->regs + REG_MAC_FCS_ERR) & 0xffff;
stats[N_TX_RINGS].rx_frame_errors +=
readl(cp->regs + REG_MAC_ALIGN_ERR) &0xffff;
stats[N_TX_RINGS].rx_length_errors +=
readl(cp->regs + REG_MAC_LEN_ERR) & 0xffff;
#if 1
tmp = (readl(cp->regs + REG_MAC_COLL_EXCESS) & 0xffff) +
(readl(cp->regs + REG_MAC_COLL_LATE) & 0xffff);
stats[N_TX_RINGS].tx_aborted_errors += tmp;
stats[N_TX_RINGS].collisions +=
tmp + (readl(cp->regs + REG_MAC_COLL_NORMAL) & 0xffff);
#else
stats[N_TX_RINGS].tx_aborted_errors +=
readl(cp->regs + REG_MAC_COLL_EXCESS);
stats[N_TX_RINGS].collisions += readl(cp->regs + REG_MAC_COLL_EXCESS) +
readl(cp->regs + REG_MAC_COLL_LATE);
#endif
cas_clear_mac_err(cp);
/* saved bits that are unique to ring 0 */
spin_lock(&cp->stat_lock[0]);
stats[N_TX_RINGS].collisions += stats[0].collisions;
stats[N_TX_RINGS].rx_over_errors += stats[0].rx_over_errors;
stats[N_TX_RINGS].rx_frame_errors += stats[0].rx_frame_errors;
stats[N_TX_RINGS].rx_fifo_errors += stats[0].rx_fifo_errors;
stats[N_TX_RINGS].tx_aborted_errors += stats[0].tx_aborted_errors;
stats[N_TX_RINGS].tx_fifo_errors += stats[0].tx_fifo_errors;
spin_unlock(&cp->stat_lock[0]);
for (i = 0; i < N_TX_RINGS; i++) {
spin_lock(&cp->stat_lock[i]);
stats[N_TX_RINGS].rx_length_errors +=
stats[i].rx_length_errors;
stats[N_TX_RINGS].rx_crc_errors += stats[i].rx_crc_errors;
stats[N_TX_RINGS].rx_packets += stats[i].rx_packets;
stats[N_TX_RINGS].tx_packets += stats[i].tx_packets;
stats[N_TX_RINGS].rx_bytes += stats[i].rx_bytes;
stats[N_TX_RINGS].tx_bytes += stats[i].tx_bytes;
stats[N_TX_RINGS].rx_errors += stats[i].rx_errors;
stats[N_TX_RINGS].tx_errors += stats[i].tx_errors;
stats[N_TX_RINGS].rx_dropped += stats[i].rx_dropped;
stats[N_TX_RINGS].tx_dropped += stats[i].tx_dropped;
memset(stats + i, 0, sizeof(struct net_device_stats));
spin_unlock(&cp->stat_lock[i]);
}
spin_unlock_irqrestore(&cp->stat_lock[N_TX_RINGS], flags);
return stats + N_TX_RINGS;
}
static void cas_set_multicast(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
u32 rxcfg, rxcfg_new;
unsigned long flags;
int limit = STOP_TRIES;
if (!cp->hw_running)
return;
spin_lock_irqsave(&cp->lock, flags);
rxcfg = readl(cp->regs + REG_MAC_RX_CFG);
/* disable RX MAC and wait for completion */
writel(rxcfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
while (readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_EN) {
if (!limit--)
break;
udelay(10);
}
/* disable hash filter and wait for completion */
limit = STOP_TRIES;
rxcfg &= ~(MAC_RX_CFG_PROMISC_EN | MAC_RX_CFG_HASH_FILTER_EN);
writel(rxcfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
while (readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_HASH_FILTER_EN) {
if (!limit--)
break;
udelay(10);
}
/* program hash filters */
cp->mac_rx_cfg = rxcfg_new = cas_setup_multicast(cp);
rxcfg |= rxcfg_new;
writel(rxcfg, cp->regs + REG_MAC_RX_CFG);
spin_unlock_irqrestore(&cp->lock, flags);
}
static void cas_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
struct cas *cp = netdev_priv(dev);
strncpy(info->driver, DRV_MODULE_NAME, ETHTOOL_BUSINFO_LEN);
strncpy(info->version, DRV_MODULE_VERSION, ETHTOOL_BUSINFO_LEN);
info->fw_version[0] = '\0';
strncpy(info->bus_info, pci_name(cp->pdev), ETHTOOL_BUSINFO_LEN);
info->regdump_len = cp->casreg_len < CAS_MAX_REGS ?
cp->casreg_len : CAS_MAX_REGS;
info->n_stats = CAS_NUM_STAT_KEYS;
}
static int cas_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct cas *cp = netdev_priv(dev);
u16 bmcr;
int full_duplex, speed, pause;
unsigned long flags;
enum link_state linkstate = link_up;
cmd->advertising = 0;
cmd->supported = SUPPORTED_Autoneg;
if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
cmd->supported |= SUPPORTED_1000baseT_Full;
cmd->advertising |= ADVERTISED_1000baseT_Full;
}
/* Record PHY settings if HW is on. */
spin_lock_irqsave(&cp->lock, flags);
bmcr = 0;
linkstate = cp->lstate;
if (CAS_PHY_MII(cp->phy_type)) {
cmd->port = PORT_MII;
cmd->transceiver = (cp->cas_flags & CAS_FLAG_SATURN) ?
XCVR_INTERNAL : XCVR_EXTERNAL;
cmd->phy_address = cp->phy_addr;
cmd->advertising |= ADVERTISED_TP | ADVERTISED_MII |
ADVERTISED_10baseT_Half |
ADVERTISED_10baseT_Full |
ADVERTISED_100baseT_Half |
ADVERTISED_100baseT_Full;
cmd->supported |=
(SUPPORTED_10baseT_Half |
SUPPORTED_10baseT_Full |
SUPPORTED_100baseT_Half |
SUPPORTED_100baseT_Full |
SUPPORTED_TP | SUPPORTED_MII);
if (cp->hw_running) {
cas_mif_poll(cp, 0);
bmcr = cas_phy_read(cp, MII_BMCR);
cas_read_mii_link_mode(cp, &full_duplex,
&speed, &pause);
cas_mif_poll(cp, 1);
}
} else {
cmd->port = PORT_FIBRE;
cmd->transceiver = XCVR_INTERNAL;
cmd->phy_address = 0;
cmd->supported |= SUPPORTED_FIBRE;
cmd->advertising |= ADVERTISED_FIBRE;
if (cp->hw_running) {
/* pcs uses the same bits as mii */
bmcr = readl(cp->regs + REG_PCS_MII_CTRL);
cas_read_pcs_link_mode(cp, &full_duplex,
&speed, &pause);
}
}
spin_unlock_irqrestore(&cp->lock, flags);
if (bmcr & BMCR_ANENABLE) {
cmd->advertising |= ADVERTISED_Autoneg;
cmd->autoneg = AUTONEG_ENABLE;
cmd->speed = ((speed == 10) ?
SPEED_10 :
((speed == 1000) ?
SPEED_1000 : SPEED_100));
cmd->duplex = full_duplex ? DUPLEX_FULL : DUPLEX_HALF;
} else {
cmd->autoneg = AUTONEG_DISABLE;
cmd->speed =
(bmcr & CAS_BMCR_SPEED1000) ?
SPEED_1000 :
((bmcr & BMCR_SPEED100) ? SPEED_100:
SPEED_10);
cmd->duplex =
(bmcr & BMCR_FULLDPLX) ?
DUPLEX_FULL : DUPLEX_HALF;
}
if (linkstate != link_up) {
/* Force these to "unknown" if the link is not up and
* autonogotiation in enabled. We can set the link
* speed to 0, but not cmd->duplex,
* because its legal values are 0 and 1. Ethtool will
* print the value reported in parentheses after the
* word "Unknown" for unrecognized values.
*
* If in forced mode, we report the speed and duplex
* settings that we configured.
*/
if (cp->link_cntl & BMCR_ANENABLE) {
cmd->speed = 0;
cmd->duplex = 0xff;
} else {
cmd->speed = SPEED_10;
if (cp->link_cntl & BMCR_SPEED100) {
cmd->speed = SPEED_100;
} else if (cp->link_cntl & CAS_BMCR_SPEED1000) {
cmd->speed = SPEED_1000;
}
cmd->duplex = (cp->link_cntl & BMCR_FULLDPLX)?
DUPLEX_FULL : DUPLEX_HALF;
}
}
return 0;
}
static int cas_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct cas *cp = netdev_priv(dev);
unsigned long flags;
/* Verify the settings we care about. */
if (cmd->autoneg != AUTONEG_ENABLE &&
cmd->autoneg != AUTONEG_DISABLE)
return -EINVAL;
if (cmd->autoneg == AUTONEG_DISABLE &&
((cmd->speed != SPEED_1000 &&
cmd->speed != SPEED_100 &&
cmd->speed != SPEED_10) ||
(cmd->duplex != DUPLEX_HALF &&
cmd->duplex != DUPLEX_FULL)))
return -EINVAL;
/* Apply settings and restart link process. */
spin_lock_irqsave(&cp->lock, flags);
cas_begin_auto_negotiation(cp, cmd);
spin_unlock_irqrestore(&cp->lock, flags);
return 0;
}
static int cas_nway_reset(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
unsigned long flags;
if ((cp->link_cntl & BMCR_ANENABLE) == 0)
return -EINVAL;
/* Restart link process. */
spin_lock_irqsave(&cp->lock, flags);
cas_begin_auto_negotiation(cp, NULL);
spin_unlock_irqrestore(&cp->lock, flags);
return 0;
}
static u32 cas_get_link(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
return cp->lstate == link_up;
}
static u32 cas_get_msglevel(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
return cp->msg_enable;
}
static void cas_set_msglevel(struct net_device *dev, u32 value)
{
struct cas *cp = netdev_priv(dev);
cp->msg_enable = value;
}
static int cas_get_regs_len(struct net_device *dev)
{
struct cas *cp = netdev_priv(dev);
return cp->casreg_len < CAS_MAX_REGS ? cp->casreg_len: CAS_MAX_REGS;
}
static void cas_get_regs(struct net_device *dev, struct ethtool_regs *regs,
void *p)
{
struct cas *cp = netdev_priv(dev);
regs->version = 0;
/* cas_read_regs handles locks (cp->lock). */
cas_read_regs(cp, p, regs->len / sizeof(u32));
}
static int cas_get_sset_count(struct net_device *dev, int sset)
{
switch (sset) {
case ETH_SS_STATS:
return CAS_NUM_STAT_KEYS;
default:
return -EOPNOTSUPP;
}
}
static void cas_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
memcpy(data, &ethtool_cassini_statnames,
CAS_NUM_STAT_KEYS * ETH_GSTRING_LEN);
}
static void cas_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *estats, u64 *data)
{
struct cas *cp = netdev_priv(dev);
struct net_device_stats *stats = cas_get_stats(cp->dev);
int i = 0;
data[i++] = stats->collisions;
data[i++] = stats->rx_bytes;
data[i++] = stats->rx_crc_errors;
data[i++] = stats->rx_dropped;
data[i++] = stats->rx_errors;
data[i++] = stats->rx_fifo_errors;
data[i++] = stats->rx_frame_errors;
data[i++] = stats->rx_length_errors;
data[i++] = stats->rx_over_errors;
data[i++] = stats->rx_packets;
data[i++] = stats->tx_aborted_errors;
data[i++] = stats->tx_bytes;
data[i++] = stats->tx_dropped;
data[i++] = stats->tx_errors;
data[i++] = stats->tx_fifo_errors;
data[i++] = stats->tx_packets;
BUG_ON(i != CAS_NUM_STAT_KEYS);
}
static const struct ethtool_ops cas_ethtool_ops = {
.get_drvinfo = cas_get_drvinfo,
.get_settings = cas_get_settings,
.set_settings = cas_set_settings,
.nway_reset = cas_nway_reset,
.get_link = cas_get_link,
.get_msglevel = cas_get_msglevel,
.set_msglevel = cas_set_msglevel,
.get_regs_len = cas_get_regs_len,
.get_regs = cas_get_regs,
.get_sset_count = cas_get_sset_count,
.get_strings = cas_get_strings,
.get_ethtool_stats = cas_get_ethtool_stats,
};
static int cas_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct cas *cp = netdev_priv(dev);
struct mii_ioctl_data *data = if_mii(ifr);
unsigned long flags;
int rc = -EOPNOTSUPP;
/* Hold the PM mutex while doing ioctl's or we may collide
* with open/close and power management and oops.
*/
mutex_lock(&cp->pm_mutex);
switch (cmd) {
case SIOCGMIIPHY: /* Get address of MII PHY in use. */
data->phy_id = cp->phy_addr;
/* Fallthrough... */
case SIOCGMIIREG: /* Read MII PHY register. */
spin_lock_irqsave(&cp->lock, flags);
cas_mif_poll(cp, 0);
data->val_out = cas_phy_read(cp, data->reg_num & 0x1f);
cas_mif_poll(cp, 1);
spin_unlock_irqrestore(&cp->lock, flags);
rc = 0;
break;
case SIOCSMIIREG: /* Write MII PHY register. */
if (!capable(CAP_NET_ADMIN)) {
rc = -EPERM;
break;
}
spin_lock_irqsave(&cp->lock, flags);
cas_mif_poll(cp, 0);
rc = cas_phy_write(cp, data->reg_num & 0x1f, data->val_in);
cas_mif_poll(cp, 1);
spin_unlock_irqrestore(&cp->lock, flags);
break;
default:
break;
};
mutex_unlock(&cp->pm_mutex);
return rc;
}
/* When this chip sits underneath an Intel 31154 bridge, it is the
* only subordinate device and we can tweak the bridge settings to
* reflect that fact.
*/
static void __devinit cas_program_bridge(struct pci_dev *cas_pdev)
{
struct pci_dev *pdev = cas_pdev->bus->self;
u32 val;
if (!pdev)
return;
if (pdev->vendor != 0x8086 || pdev->device != 0x537c)
return;
/* Clear bit 10 (Bus Parking Control) in the Secondary
* Arbiter Control/Status Register which lives at offset
* 0x41. Using a 32-bit word read/modify/write at 0x40
* is much simpler so that's how we do this.
*/
pci_read_config_dword(pdev, 0x40, &val);
val &= ~0x00040000;
pci_write_config_dword(pdev, 0x40, val);
/* Max out the Multi-Transaction Timer settings since
* Cassini is the only device present.
*
* The register is 16-bit and lives at 0x50. When the
* settings are enabled, it extends the GRANT# signal
* for a requestor after a transaction is complete. This
* allows the next request to run without first needing
* to negotiate the GRANT# signal back.
*
* Bits 12:10 define the grant duration:
*
* 1 -- 16 clocks
* 2 -- 32 clocks
* 3 -- 64 clocks
* 4 -- 128 clocks
* 5 -- 256 clocks
*
* All other values are illegal.
*
* Bits 09:00 define which REQ/GNT signal pairs get the
* GRANT# signal treatment. We set them all.
*/
pci_write_config_word(pdev, 0x50, (5 << 10) | 0x3ff);
/* The Read Prefecth Policy register is 16-bit and sits at
* offset 0x52. It enables a "smart" pre-fetch policy. We
* enable it and max out all of the settings since only one
* device is sitting underneath and thus bandwidth sharing is
* not an issue.
*
* The register has several 3 bit fields, which indicates a
* multiplier applied to the base amount of prefetching the
* chip would do. These fields are at:
*
* 15:13 --- ReRead Primary Bus
* 12:10 --- FirstRead Primary Bus
* 09:07 --- ReRead Secondary Bus
* 06:04 --- FirstRead Secondary Bus
*
* Bits 03:00 control which REQ/GNT pairs the prefetch settings
* get enabled on. Bit 3 is a grouped enabler which controls
* all of the REQ/GNT pairs from [8:3]. Bits 2 to 0 control
* the individual REQ/GNT pairs [2:0].
*/
pci_write_config_word(pdev, 0x52,
(0x7 << 13) |
(0x7 << 10) |
(0x7 << 7) |
(0x7 << 4) |
(0xf << 0));
/* Force cacheline size to 0x8 */
pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x08);
/* Force latency timer to maximum setting so Cassini can
* sit on the bus as long as it likes.
*/
pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xff);
}
static const struct net_device_ops cas_netdev_ops = {
.ndo_open = cas_open,
.ndo_stop = cas_close,
.ndo_start_xmit = cas_start_xmit,
.ndo_get_stats = cas_get_stats,
.ndo_set_multicast_list = cas_set_multicast,
.ndo_do_ioctl = cas_ioctl,
.ndo_tx_timeout = cas_tx_timeout,
.ndo_change_mtu = cas_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = cas_netpoll,
#endif
};
static int __devinit cas_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
static int cas_version_printed = 0;
unsigned long casreg_len;
struct net_device *dev;
struct cas *cp;
int i, err, pci_using_dac;
u16 pci_cmd;
u8 orig_cacheline_size = 0, cas_cacheline_size = 0;
if (cas_version_printed++ == 0)
printk(KERN_INFO "%s", version);
err = pci_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "Cannot enable PCI device, aborting.\n");
return err;
}
if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
dev_err(&pdev->dev, "Cannot find proper PCI device "
"base address, aborting.\n");
err = -ENODEV;
goto err_out_disable_pdev;
}
dev = alloc_etherdev(sizeof(*cp));
if (!dev) {
dev_err(&pdev->dev, "Etherdev alloc failed, aborting.\n");
err = -ENOMEM;
goto err_out_disable_pdev;
}
SET_NETDEV_DEV(dev, &pdev->dev);
err = pci_request_regions(pdev, dev->name);
if (err) {
dev_err(&pdev->dev, "Cannot obtain PCI resources, aborting.\n");
goto err_out_free_netdev;
}
pci_set_master(pdev);
/* we must always turn on parity response or else parity
* doesn't get generated properly. disable SERR/PERR as well.
* in addition, we want to turn MWI on.
*/
pci_read_config_word(pdev, PCI_COMMAND, &pci_cmd);
pci_cmd &= ~PCI_COMMAND_SERR;
pci_cmd |= PCI_COMMAND_PARITY;
pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
if (pci_try_set_mwi(pdev))
printk(KERN_WARNING PFX "Could not enable MWI for %s\n",
pci_name(pdev));
cas_program_bridge(pdev);
/*
* On some architectures, the default cache line size set
* by pci_try_set_mwi reduces perforamnce. We have to increase
* it for this case. To start, we'll print some configuration
* data.
*/
#if 1
pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE,
&orig_cacheline_size);
if (orig_cacheline_size < CAS_PREF_CACHELINE_SIZE) {
cas_cacheline_size =
(CAS_PREF_CACHELINE_SIZE < SMP_CACHE_BYTES) ?
CAS_PREF_CACHELINE_SIZE : SMP_CACHE_BYTES;
if (pci_write_config_byte(pdev,
PCI_CACHE_LINE_SIZE,
cas_cacheline_size)) {
dev_err(&pdev->dev, "Could not set PCI cache "
"line size\n");
goto err_write_cacheline;
}
}
#endif
/* Configure DMA attributes. */
if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
pci_using_dac = 1;
err = pci_set_consistent_dma_mask(pdev,
DMA_BIT_MASK(64));
if (err < 0) {
dev_err(&pdev->dev, "Unable to obtain 64-bit DMA "
"for consistent allocations\n");
goto err_out_free_res;
}
} else {
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (err) {
dev_err(&pdev->dev, "No usable DMA configuration, "
"aborting.\n");
goto err_out_free_res;
}
pci_using_dac = 0;
}
casreg_len = pci_resource_len(pdev, 0);
cp = netdev_priv(dev);
cp->pdev = pdev;
#if 1
/* A value of 0 indicates we never explicitly set it */
cp->orig_cacheline_size = cas_cacheline_size ? orig_cacheline_size: 0;
#endif
cp->dev = dev;
cp->msg_enable = (cassini_debug < 0) ? CAS_DEF_MSG_ENABLE :
cassini_debug;
cp->link_transition = LINK_TRANSITION_UNKNOWN;
cp->link_transition_jiffies_valid = 0;
spin_lock_init(&cp->lock);
spin_lock_init(&cp->rx_inuse_lock);
spin_lock_init(&cp->rx_spare_lock);
for (i = 0; i < N_TX_RINGS; i++) {
spin_lock_init(&cp->stat_lock[i]);
spin_lock_init(&cp->tx_lock[i]);
}
spin_lock_init(&cp->stat_lock[N_TX_RINGS]);
mutex_init(&cp->pm_mutex);
init_timer(&cp->link_timer);
cp->link_timer.function = cas_link_timer;
cp->link_timer.data = (unsigned long) cp;
#if 1
/* Just in case the implementation of atomic operations
* change so that an explicit initialization is necessary.
*/
atomic_set(&cp->reset_task_pending, 0);
atomic_set(&cp->reset_task_pending_all, 0);
atomic_set(&cp->reset_task_pending_spare, 0);
atomic_set(&cp->reset_task_pending_mtu, 0);
#endif
INIT_WORK(&cp->reset_task, cas_reset_task);
/* Default link parameters */
if (link_mode >= 0 && link_mode <= 6)
cp->link_cntl = link_modes[link_mode];
else
cp->link_cntl = BMCR_ANENABLE;
cp->lstate = link_down;
cp->link_transition = LINK_TRANSITION_LINK_DOWN;
netif_carrier_off(cp->dev);
cp->timer_ticks = 0;
/* give us access to cassini registers */
cp->regs = pci_iomap(pdev, 0, casreg_len);
if (!cp->regs) {
dev_err(&pdev->dev, "Cannot map device registers, aborting.\n");
goto err_out_free_res;
}
cp->casreg_len = casreg_len;
pci_save_state(pdev);
cas_check_pci_invariants(cp);
cas_hard_reset(cp);
cas_reset(cp, 0);
if (cas_check_invariants(cp))
goto err_out_iounmap;
if (cp->cas_flags & CAS_FLAG_SATURN)
if (cas_saturn_firmware_init(cp))
goto err_out_iounmap;
cp->init_block = (struct cas_init_block *)
pci_alloc_consistent(pdev, sizeof(struct cas_init_block),
&cp->block_dvma);
if (!cp->init_block) {
dev_err(&pdev->dev, "Cannot allocate init block, aborting.\n");
goto err_out_iounmap;
}
for (i = 0; i < N_TX_RINGS; i++)
cp->init_txds[i] = cp->init_block->txds[i];
for (i = 0; i < N_RX_DESC_RINGS; i++)
cp->init_rxds[i] = cp->init_block->rxds[i];
for (i = 0; i < N_RX_COMP_RINGS; i++)
cp->init_rxcs[i] = cp->init_block->rxcs[i];
for (i = 0; i < N_RX_FLOWS; i++)
skb_queue_head_init(&cp->rx_flows[i]);
dev->netdev_ops = &cas_netdev_ops;
dev->ethtool_ops = &cas_ethtool_ops;
dev->watchdog_timeo = CAS_TX_TIMEOUT;
#ifdef USE_NAPI
netif_napi_add(dev, &cp->napi, cas_poll, 64);
#endif
dev->irq = pdev->irq;
dev->dma = 0;
/* Cassini features. */
if ((cp->cas_flags & CAS_FLAG_NO_HW_CSUM) == 0)
dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
if (pci_using_dac)
dev->features |= NETIF_F_HIGHDMA;
if (register_netdev(dev)) {
dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
goto err_out_free_consistent;
}
i = readl(cp->regs + REG_BIM_CFG);
printk(KERN_INFO "%s: Sun Cassini%s (%sbit/%sMHz PCI/%s) "
"Ethernet[%d] %pM\n", dev->name,
(cp->cas_flags & CAS_FLAG_REG_PLUS) ? "+" : "",
(i & BIM_CFG_32BIT) ? "32" : "64",
(i & BIM_CFG_66MHZ) ? "66" : "33",
(cp->phy_type == CAS_PHY_SERDES) ? "Fi" : "Cu", pdev->irq,
dev->dev_addr);
pci_set_drvdata(pdev, dev);
cp->hw_running = 1;
cas_entropy_reset(cp);
cas_phy_init(cp);
cas_begin_auto_negotiation(cp, NULL);
return 0;
err_out_free_consistent:
pci_free_consistent(pdev, sizeof(struct cas_init_block),
cp->init_block, cp->block_dvma);
err_out_iounmap:
mutex_lock(&cp->pm_mutex);
if (cp->hw_running)
cas_shutdown(cp);
mutex_unlock(&cp->pm_mutex);
pci_iounmap(pdev, cp->regs);
err_out_free_res:
pci_release_regions(pdev);
err_write_cacheline:
/* Try to restore it in case the error occured after we
* set it.
*/
pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, orig_cacheline_size);
err_out_free_netdev:
free_netdev(dev);
err_out_disable_pdev:
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
return -ENODEV;
}
static void __devexit cas_remove_one(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct cas *cp;
if (!dev)
return;
cp = netdev_priv(dev);
unregister_netdev(dev);
if (cp->fw_data)
vfree(cp->fw_data);
mutex_lock(&cp->pm_mutex);
flush_scheduled_work();
if (cp->hw_running)
cas_shutdown(cp);
mutex_unlock(&cp->pm_mutex);
#if 1
if (cp->orig_cacheline_size) {
/* Restore the cache line size if we had modified
* it.
*/
pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
cp->orig_cacheline_size);
}
#endif
pci_free_consistent(pdev, sizeof(struct cas_init_block),
cp->init_block, cp->block_dvma);
pci_iounmap(pdev, cp->regs);
free_netdev(dev);
pci_release_regions(pdev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
}
#ifdef CONFIG_PM
static int cas_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct cas *cp = netdev_priv(dev);
unsigned long flags;
mutex_lock(&cp->pm_mutex);
/* If the driver is opened, we stop the DMA */
if (cp->opened) {
netif_device_detach(dev);
cas_lock_all_save(cp, flags);
/* We can set the second arg of cas_reset to 0
* because on resume, we'll call cas_init_hw with
* its second arg set so that autonegotiation is
* restarted.
*/
cas_reset(cp, 0);
cas_clean_rings(cp);
cas_unlock_all_restore(cp, flags);
}
if (cp->hw_running)
cas_shutdown(cp);
mutex_unlock(&cp->pm_mutex);
return 0;
}
static int cas_resume(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct cas *cp = netdev_priv(dev);
printk(KERN_INFO "%s: resuming\n", dev->name);
mutex_lock(&cp->pm_mutex);
cas_hard_reset(cp);
if (cp->opened) {
unsigned long flags;
cas_lock_all_save(cp, flags);
cas_reset(cp, 0);
cp->hw_running = 1;
cas_clean_rings(cp);
cas_init_hw(cp, 1);
cas_unlock_all_restore(cp, flags);
netif_device_attach(dev);
}
mutex_unlock(&cp->pm_mutex);
return 0;
}
#endif /* CONFIG_PM */
static struct pci_driver cas_driver = {
.name = DRV_MODULE_NAME,
.id_table = cas_pci_tbl,
.probe = cas_init_one,
.remove = __devexit_p(cas_remove_one),
#ifdef CONFIG_PM
.suspend = cas_suspend,
.resume = cas_resume
#endif
};
static int __init cas_init(void)
{
if (linkdown_timeout > 0)
link_transition_timeout = linkdown_timeout * HZ;
else
link_transition_timeout = 0;
return pci_register_driver(&cas_driver);
}
static void __exit cas_cleanup(void)
{
pci_unregister_driver(&cas_driver);
}
module_init(cas_init);
module_exit(cas_cleanup);
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