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qemu-e2k/hw/stellaris_enet.c
aliguori 0ae18ceeaa Check NIC model in some NIC init functions (Mark McLoughlin) 
Some NIC init functions are only called when that model is
the only valid model. In that case, it makes sense to use
qemu_check_nic_model() from the NIC init function itself.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6286 c046a42c-6fe2-441c-8c8c-71466251a162
2009-01-13 19:39:36 +00:00

411 lines
12 KiB
C
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/*
* Luminary Micro Stellaris Ethernet Controller
*
* Copyright (c) 2007 CodeSourcery.
* Written by Paul Brook
*
* This code is licenced under the GPL.
*/
#include "hw.h"
#include "arm-misc.h"
#include "net.h"
#include <zlib.h>
//#define DEBUG_STELLARIS_ENET 1
#ifdef DEBUG_STELLARIS_ENET
#define DPRINTF(fmt, args...) \
do { printf("stellaris_enet: " fmt , ##args); } while (0)
#define BADF(fmt, args...) \
do { fprintf(stderr, "stellaris_enet: error: " fmt , ##args); exit(1);} while (0)
#else
#define DPRINTF(fmt, args...) do {} while(0)
#define BADF(fmt, args...) \
do { fprintf(stderr, "stellaris_enet: error: " fmt , ##args);} while (0)
#endif
#define SE_INT_RX 0x01
#define SE_INT_TXER 0x02
#define SE_INT_TXEMP 0x04
#define SE_INT_FOV 0x08
#define SE_INT_RXER 0x10
#define SE_INT_MD 0x20
#define SE_INT_PHY 0x40
#define SE_RCTL_RXEN 0x01
#define SE_RCTL_AMUL 0x02
#define SE_RCTL_PRMS 0x04
#define SE_RCTL_BADCRC 0x08
#define SE_RCTL_RSTFIFO 0x10
#define SE_TCTL_TXEN 0x01
#define SE_TCTL_PADEN 0x02
#define SE_TCTL_CRC 0x04
#define SE_TCTL_DUPLEX 0x08
typedef struct {
uint32_t ris;
uint32_t im;
uint32_t rctl;
uint32_t tctl;
uint32_t thr;
uint32_t mctl;
uint32_t mdv;
uint32_t mtxd;
uint32_t mrxd;
uint32_t np;
int tx_frame_len;
int tx_fifo_len;
uint8_t tx_fifo[2048];
/* Real hardware has a 2k fifo, which works out to be at most 31 packets.
We implement a full 31 packet fifo. */
struct {
uint8_t data[2048];
int len;
} rx[31];
uint8_t *rx_fifo;
int rx_fifo_len;
int next_packet;
VLANClientState *vc;
qemu_irq irq;
uint8_t macaddr[6];
} stellaris_enet_state;
static void stellaris_enet_update(stellaris_enet_state *s)
{
qemu_set_irq(s->irq, (s->ris & s->im) != 0);
}
/* TODO: Implement MAC address filtering. */
static void stellaris_enet_receive(void *opaque, const uint8_t *buf, int size)
{
stellaris_enet_state *s = (stellaris_enet_state *)opaque;
int n;
uint8_t *p;
uint32_t crc;
if ((s->rctl & SE_RCTL_RXEN) == 0)
return;
if (s->np >= 31) {
DPRINTF("Packet dropped\n");
return;
}
DPRINTF("Received packet len=%d\n", size);
n = s->next_packet + s->np;
if (n >= 31)
n -= 31;
s->np++;
s->rx[n].len = size + 6;
p = s->rx[n].data;
*(p++) = (size + 6);
*(p++) = (size + 6) >> 8;
memcpy (p, buf, size);
p += size;
crc = crc32(~0, buf, size);
*(p++) = crc;
*(p++) = crc >> 8;
*(p++) = crc >> 16;
*(p++) = crc >> 24;
/* Clear the remaining bytes in the last word. */
if ((size & 3) != 2) {
memset(p, 0, (6 - size) & 3);
}
s->ris |= SE_INT_RX;
stellaris_enet_update(s);
}
static int stellaris_enet_can_receive(void *opaque)
{
stellaris_enet_state *s = (stellaris_enet_state *)opaque;
if ((s->rctl & SE_RCTL_RXEN) == 0)
return 1;
return (s->np < 31);
}
static uint32_t stellaris_enet_read(void *opaque, target_phys_addr_t offset)
{
stellaris_enet_state *s = (stellaris_enet_state *)opaque;
uint32_t val;
switch (offset) {
case 0x00: /* RIS */
DPRINTF("IRQ status %02x\n", s->ris);
return s->ris;
case 0x04: /* IM */
return s->im;
case 0x08: /* RCTL */
return s->rctl;
case 0x0c: /* TCTL */
return s->tctl;
case 0x10: /* DATA */
if (s->rx_fifo_len == 0) {
if (s->np == 0) {
BADF("RX underflow\n");
return 0;
}
s->rx_fifo_len = s->rx[s->next_packet].len;
s->rx_fifo = s->rx[s->next_packet].data;
DPRINTF("RX FIFO start packet len=%d\n", s->rx_fifo_len);
}
val = s->rx_fifo[0] | (s->rx_fifo[1] << 8) | (s->rx_fifo[2] << 16)
| (s->rx_fifo[3] << 24);
s->rx_fifo += 4;
s->rx_fifo_len -= 4;
if (s->rx_fifo_len <= 0) {
s->rx_fifo_len = 0;
s->next_packet++;
if (s->next_packet >= 31)
s->next_packet = 0;
s->np--;
DPRINTF("RX done np=%d\n", s->np);
}
return val;
case 0x14: /* IA0 */
return s->macaddr[0] | (s->macaddr[1] << 8)
| (s->macaddr[2] << 16) | (s->macaddr[3] << 24);
case 0x18: /* IA1 */
return s->macaddr[4] | (s->macaddr[5] << 8);
case 0x1c: /* THR */
return s->thr;
case 0x20: /* MCTL */
return s->mctl;
case 0x24: /* MDV */
return s->mdv;
case 0x28: /* MADD */
return 0;
case 0x2c: /* MTXD */
return s->mtxd;
case 0x30: /* MRXD */
return s->mrxd;
case 0x34: /* NP */
return s->np;
case 0x38: /* TR */
return 0;
case 0x3c: /* Undocuented: Timestamp? */
return 0;
default:
cpu_abort (cpu_single_env, "stellaris_enet_read: Bad offset %x\n",
(int)offset);
return 0;
}
}
static void stellaris_enet_write(void *opaque, target_phys_addr_t offset,
uint32_t value)
{
stellaris_enet_state *s = (stellaris_enet_state *)opaque;
switch (offset) {
case 0x00: /* IACK */
s->ris &= ~value;
DPRINTF("IRQ ack %02x/%02x\n", value, s->ris);
stellaris_enet_update(s);
/* Clearing TXER also resets the TX fifo. */
if (value & SE_INT_TXER)
s->tx_frame_len = -1;
break;
case 0x04: /* IM */
DPRINTF("IRQ mask %02x/%02x\n", value, s->ris);
s->im = value;
stellaris_enet_update(s);
break;
case 0x08: /* RCTL */
s->rctl = value;
if (value & SE_RCTL_RSTFIFO) {
s->rx_fifo_len = 0;
s->np = 0;
stellaris_enet_update(s);
}
break;
case 0x0c: /* TCTL */
s->tctl = value;
break;
case 0x10: /* DATA */
if (s->tx_frame_len == -1) {
s->tx_frame_len = value & 0xffff;
if (s->tx_frame_len > 2032) {
DPRINTF("TX frame too long (%d)\n", s->tx_frame_len);
s->tx_frame_len = 0;
s->ris |= SE_INT_TXER;
stellaris_enet_update(s);
} else {
DPRINTF("Start TX frame len=%d\n", s->tx_frame_len);
/* The value written does not include the ethernet header. */
s->tx_frame_len += 14;
if ((s->tctl & SE_TCTL_CRC) == 0)
s->tx_frame_len += 4;
s->tx_fifo_len = 0;
s->tx_fifo[s->tx_fifo_len++] = value >> 16;
s->tx_fifo[s->tx_fifo_len++] = value >> 24;
}
} else {
s->tx_fifo[s->tx_fifo_len++] = value;
s->tx_fifo[s->tx_fifo_len++] = value >> 8;
s->tx_fifo[s->tx_fifo_len++] = value >> 16;
s->tx_fifo[s->tx_fifo_len++] = value >> 24;
if (s->tx_fifo_len >= s->tx_frame_len) {
/* We don't implement explicit CRC, so just chop it off. */
if ((s->tctl & SE_TCTL_CRC) == 0)
s->tx_frame_len -= 4;
if ((s->tctl & SE_TCTL_PADEN) && s->tx_frame_len < 60) {
memset(&s->tx_fifo[s->tx_frame_len], 0, 60 - s->tx_frame_len);
s->tx_fifo_len = 60;
}
qemu_send_packet(s->vc, s->tx_fifo, s->tx_frame_len);
s->tx_frame_len = -1;
s->ris |= SE_INT_TXEMP;
stellaris_enet_update(s);
DPRINTF("Done TX\n");
}
}
break;
case 0x14: /* IA0 */
s->macaddr[0] = value;
s->macaddr[1] = value >> 8;
s->macaddr[2] = value >> 16;
s->macaddr[3] = value >> 24;
break;
case 0x18: /* IA1 */
s->macaddr[4] = value;
s->macaddr[5] = value >> 8;
break;
case 0x1c: /* THR */
s->thr = value;
break;
case 0x20: /* MCTL */
s->mctl = value;
break;
case 0x24: /* MDV */
s->mdv = value;
break;
case 0x28: /* MADD */
/* ignored. */
break;
case 0x2c: /* MTXD */
s->mtxd = value & 0xff;
break;
case 0x30: /* MRXD */
case 0x34: /* NP */
case 0x38: /* TR */
/* Ignored. */
case 0x3c: /* Undocuented: Timestamp? */
/* Ignored. */
break;
default:
cpu_abort (cpu_single_env, "stellaris_enet_write: Bad offset %x\n",
(int)offset);
}
}
static CPUReadMemoryFunc *stellaris_enet_readfn[] = {
stellaris_enet_read,
stellaris_enet_read,
stellaris_enet_read
};
static CPUWriteMemoryFunc *stellaris_enet_writefn[] = {
stellaris_enet_write,
stellaris_enet_write,
stellaris_enet_write
};
static void stellaris_enet_reset(stellaris_enet_state *s)
{
s->mdv = 0x80;
s->rctl = SE_RCTL_BADCRC;
s->im = SE_INT_PHY | SE_INT_MD | SE_INT_RXER | SE_INT_FOV | SE_INT_TXEMP
| SE_INT_TXER | SE_INT_RX;
s->thr = 0x3f;
s->tx_frame_len = -1;
}
static void stellaris_enet_save(QEMUFile *f, void *opaque)
{
stellaris_enet_state *s = (stellaris_enet_state *)opaque;
int i;
qemu_put_be32(f, s->ris);
qemu_put_be32(f, s->im);
qemu_put_be32(f, s->rctl);
qemu_put_be32(f, s->tctl);
qemu_put_be32(f, s->thr);
qemu_put_be32(f, s->mctl);
qemu_put_be32(f, s->mdv);
qemu_put_be32(f, s->mtxd);
qemu_put_be32(f, s->mrxd);
qemu_put_be32(f, s->np);
qemu_put_be32(f, s->tx_frame_len);
qemu_put_be32(f, s->tx_fifo_len);
qemu_put_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
for (i = 0; i < 31; i++) {
qemu_put_be32(f, s->rx[i].len);
qemu_put_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));
}
qemu_put_be32(f, s->next_packet);
qemu_put_be32(f, s->rx_fifo - s->rx[s->next_packet].data);
qemu_put_be32(f, s->rx_fifo_len);
}
static int stellaris_enet_load(QEMUFile *f, void *opaque, int version_id)
{
stellaris_enet_state *s = (stellaris_enet_state *)opaque;
int i;
if (version_id != 1)
return -EINVAL;
s->ris = qemu_get_be32(f);
s->im = qemu_get_be32(f);
s->rctl = qemu_get_be32(f);
s->tctl = qemu_get_be32(f);
s->thr = qemu_get_be32(f);
s->mctl = qemu_get_be32(f);
s->mdv = qemu_get_be32(f);
s->mtxd = qemu_get_be32(f);
s->mrxd = qemu_get_be32(f);
s->np = qemu_get_be32(f);
s->tx_frame_len = qemu_get_be32(f);
s->tx_fifo_len = qemu_get_be32(f);
qemu_get_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
for (i = 0; i < 31; i++) {
s->rx[i].len = qemu_get_be32(f);
qemu_get_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));
}
s->next_packet = qemu_get_be32(f);
s->rx_fifo = s->rx[s->next_packet].data + qemu_get_be32(f);
s->rx_fifo_len = qemu_get_be32(f);
return 0;
}
void stellaris_enet_init(NICInfo *nd, uint32_t base, qemu_irq irq)
{
stellaris_enet_state *s;
int iomemtype;
qemu_check_nic_model(nd, "stellaris");
s = (stellaris_enet_state *)qemu_mallocz(sizeof(stellaris_enet_state));
iomemtype = cpu_register_io_memory(0, stellaris_enet_readfn,
stellaris_enet_writefn, s);
cpu_register_physical_memory(base, 0x00001000, iomemtype);
s->irq = irq;
memcpy(s->macaddr, nd->macaddr, 6);
if (nd->vlan) {
s->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
stellaris_enet_receive, stellaris_enet_can_receive, s);
qemu_format_nic_info_str(s->vc, s->macaddr);
}
stellaris_enet_reset(s);
register_savevm("stellaris_enet", -1, 1,
stellaris_enet_save, stellaris_enet_load, s);
}
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