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soc: ti: add Keystone Navigator DMA support

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The Keystone Navigator DMA driver sets up the dma channels and flows for
the QMSS(Queue Manager SubSystem) who triggers the actual data movements
across clients using destination queues. Every client modules like
NETCP(Network Coprocessor), SRIO(Serial Rapid IO) and CRYPTO
Engines has its own instance of packet dma hardware. QMSS has also
an internal packet DMA module which is used as an infrastructure
DMA with zero copy.

Initially this driver was proposed as DMA engine driver but since the
hardware is not typical DMA engine and hence doesn't comply with typical
DMA engine driver needs, that approach was naked. Link to that
discussion -
	https://lkml.org/lkml/2014/3/18/340

As aligned, now we pair the Navigator DMA with its companion Navigator
QMSS subsystem driver.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Olof Johansson <olof@lixom.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sandeep Nair <sandeep_n@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
This commit is contained in:
Santosh Shilimkar 2014-03-30 17:29:04 -04:00
parent 8172296d87
commit 88139ed030
4 changed files with 1001 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/soc/ti/Kconfig
View File

@ -18,4 +18,14 @@ config KEYSTONE_NAVIGATOR_QMSS
If unsure, say N.
config KEYSTONE_NAVIGATOR_DMA
tristate "TI Keystone Navigator Packet DMA support"
depends on ARCH_KEYSTONE
help
Say y tp enable support for the Keystone Navigator Packet DMA on
on Keystone family of devices. It sets up the dma channels for the
Queue Manager Sub System.
If unsure, say N.
endif # SOC_TI

1
drivers/soc/ti/Makefile
View File

@ -2,3 +2,4 @@
# TI Keystone SOC drivers
#
obj-$(CONFIG_KEYSTONE_NAVIGATOR_QMSS) += knav_qmss_queue.o knav_qmss_acc.o
obj-$(CONFIG_KEYSTONE_NAVIGATOR_DMA) += knav_dma.o

815
drivers/soc/ti/knav_dma.c Normal file
View File

@ -0,0 +1,815 @@
/*
* Copyright (C) 2014 Texas Instruments Incorporated
* Authors: Santosh Shilimkar <santosh.shilimkar@ti.com>
* Sandeep Nair <sandeep_n@ti.com>
* Cyril Chemparathy <cyril@ti.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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/io.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/dma-direction.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <linux/of_dma.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/soc/ti/knav_dma.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#define REG_MASK 0xffffffff
#define DMA_LOOPBACK BIT(31)
#define DMA_ENABLE BIT(31)
#define DMA_TEARDOWN BIT(30)
#define DMA_TX_FILT_PSWORDS BIT(29)
#define DMA_TX_FILT_EINFO BIT(30)
#define DMA_TX_PRIO_SHIFT 0
#define DMA_RX_PRIO_SHIFT 16
#define DMA_PRIO_MASK GENMASK(3, 0)
#define DMA_PRIO_DEFAULT 0
#define DMA_RX_TIMEOUT_DEFAULT 17500 /* cycles */
#define DMA_RX_TIMEOUT_MASK GENMASK(16, 0)
#define DMA_RX_TIMEOUT_SHIFT 0
#define CHAN_HAS_EPIB BIT(30)
#define CHAN_HAS_PSINFO BIT(29)
#define CHAN_ERR_RETRY BIT(28)
#define CHAN_PSINFO_AT_SOP BIT(25)
#define CHAN_SOP_OFF_SHIFT 16
#define CHAN_SOP_OFF_MASK GENMASK(9, 0)
#define DESC_TYPE_SHIFT 26
#define DESC_TYPE_MASK GENMASK(2, 0)
/*
* QMGR & QNUM together make up 14 bits with QMGR as the 2 MSb's in the logical
* navigator cloud mapping scheme.
* using the 14bit physical queue numbers directly maps into this scheme.
*/
#define CHAN_QNUM_MASK GENMASK(14, 0)
#define DMA_MAX_QMS 4
#define DMA_TIMEOUT 1 /* msecs */
#define DMA_INVALID_ID 0xffff
struct reg_global {
u32 revision;
u32 perf_control;
u32 emulation_control;
u32 priority_control;
u32 qm_base_address[DMA_MAX_QMS];
};
struct reg_chan {
u32 control;
u32 mode;
u32 __rsvd[6];
};
struct reg_tx_sched {
u32 prio;
};
struct reg_rx_flow {
u32 control;
u32 tags;
u32 tag_sel;
u32 fdq_sel[2];
u32 thresh[3];
};
struct knav_dma_pool_device {
struct device *dev;
struct list_head list;
};
struct knav_dma_device {
bool loopback, enable_all;
unsigned tx_priority, rx_priority, rx_timeout;
unsigned logical_queue_managers;
unsigned qm_base_address[DMA_MAX_QMS];
struct reg_global __iomem *reg_global;
struct reg_chan __iomem *reg_tx_chan;
struct reg_rx_flow __iomem *reg_rx_flow;
struct reg_chan __iomem *reg_rx_chan;
struct reg_tx_sched __iomem *reg_tx_sched;
unsigned max_rx_chan, max_tx_chan;
unsigned max_rx_flow;
char name[32];
atomic_t ref_count;
struct list_head list;
struct list_head chan_list;
spinlock_t lock;
};
struct knav_dma_chan {
enum dma_transfer_direction direction;
struct knav_dma_device *dma;
atomic_t ref_count;
/* registers */
struct reg_chan __iomem *reg_chan;
struct reg_tx_sched __iomem *reg_tx_sched;
struct reg_rx_flow __iomem *reg_rx_flow;
/* configuration stuff */
unsigned channel, flow;
struct knav_dma_cfg cfg;
struct list_head list;
spinlock_t lock;
};
#define chan_number(ch) ((ch->direction == DMA_MEM_TO_DEV) ? \
ch->channel : ch->flow)
static struct knav_dma_pool_device *kdev;
static bool check_config(struct knav_dma_chan *chan, struct knav_dma_cfg *cfg)
{
if (!memcmp(&chan->cfg, cfg, sizeof(*cfg)))
return true;
else
return false;
}
static int chan_start(struct knav_dma_chan *chan,
struct knav_dma_cfg *cfg)
{
u32 v = 0;
spin_lock(&chan->lock);
if ((chan->direction == DMA_MEM_TO_DEV) && chan->reg_chan) {
if (cfg->u.tx.filt_pswords)
v |= DMA_TX_FILT_PSWORDS;
if (cfg->u.tx.filt_einfo)
v |= DMA_TX_FILT_EINFO;
writel_relaxed(v, &chan->reg_chan->mode);
writel_relaxed(DMA_ENABLE, &chan->reg_chan->control);
}
if (chan->reg_tx_sched)
writel_relaxed(cfg->u.tx.priority, &chan->reg_tx_sched->prio);
if (chan->reg_rx_flow) {
v = 0;
if (cfg->u.rx.einfo_present)
v |= CHAN_HAS_EPIB;
if (cfg->u.rx.psinfo_present)
v |= CHAN_HAS_PSINFO;
if (cfg->u.rx.err_mode == DMA_RETRY)
v |= CHAN_ERR_RETRY;
v |= (cfg->u.rx.desc_type & DESC_TYPE_MASK) << DESC_TYPE_SHIFT;
if (cfg->u.rx.psinfo_at_sop)
v |= CHAN_PSINFO_AT_SOP;
v |= (cfg->u.rx.sop_offset & CHAN_SOP_OFF_MASK)
<< CHAN_SOP_OFF_SHIFT;
v |= cfg->u.rx.dst_q & CHAN_QNUM_MASK;
writel_relaxed(v, &chan->reg_rx_flow->control);
writel_relaxed(0, &chan->reg_rx_flow->tags);
writel_relaxed(0, &chan->reg_rx_flow->tag_sel);
v = cfg->u.rx.fdq[0] << 16;
v |= cfg->u.rx.fdq[1] & CHAN_QNUM_MASK;
writel_relaxed(v, &chan->reg_rx_flow->fdq_sel[0]);
v = cfg->u.rx.fdq[2] << 16;
v |= cfg->u.rx.fdq[3] & CHAN_QNUM_MASK;
writel_relaxed(v, &chan->reg_rx_flow->fdq_sel[1]);
writel_relaxed(0, &chan->reg_rx_flow->thresh[0]);
writel_relaxed(0, &chan->reg_rx_flow->thresh[1]);
writel_relaxed(0, &chan->reg_rx_flow->thresh[2]);
}
/* Keep a copy of the cfg */
memcpy(&chan->cfg, cfg, sizeof(*cfg));
spin_unlock(&chan->lock);
return 0;
}
static int chan_teardown(struct knav_dma_chan *chan)
{
unsigned long end, value;
if (!chan->reg_chan)
return 0;
/* indicate teardown */
writel_relaxed(DMA_TEARDOWN, &chan->reg_chan->control);
/* wait for the dma to shut itself down */
end = jiffies + msecs_to_jiffies(DMA_TIMEOUT);
do {
value = readl_relaxed(&chan->reg_chan->control);
if ((value & DMA_ENABLE) == 0)
break;
} while (time_after(end, jiffies));
if (readl_relaxed(&chan->reg_chan->control) & DMA_ENABLE) {
dev_err(kdev->dev, "timeout waiting for teardown\n");
return -ETIMEDOUT;
}
return 0;
}
static void chan_stop(struct knav_dma_chan *chan)
{
spin_lock(&chan->lock);
if (chan->reg_rx_flow) {
/* first detach fdqs, starve out the flow */
writel_relaxed(0, &chan->reg_rx_flow->fdq_sel[0]);
writel_relaxed(0, &chan->reg_rx_flow->fdq_sel[1]);
writel_relaxed(0, &chan->reg_rx_flow->thresh[0]);
writel_relaxed(0, &chan->reg_rx_flow->thresh[1]);
writel_relaxed(0, &chan->reg_rx_flow->thresh[2]);
}
/* teardown the dma channel */
chan_teardown(chan);
/* then disconnect the completion side */
if (chan->reg_rx_flow) {
writel_relaxed(0, &chan->reg_rx_flow->control);
writel_relaxed(0, &chan->reg_rx_flow->tags);
writel_relaxed(0, &chan->reg_rx_flow->tag_sel);
}
memset(&chan->cfg, 0, sizeof(struct knav_dma_cfg));
spin_unlock(&chan->lock);
dev_dbg(kdev->dev, "channel stopped\n");
}
static void dma_hw_enable_all(struct knav_dma_device *dma)
{
int i;
for (i = 0; i < dma->max_tx_chan; i++) {
writel_relaxed(0, &dma->reg_tx_chan[i].mode);
writel_relaxed(DMA_ENABLE, &dma->reg_tx_chan[i].control);
}
}
static void knav_dma_hw_init(struct knav_dma_device *dma)
{
unsigned v;
int i;
spin_lock(&dma->lock);
v = dma->loopback ? DMA_LOOPBACK : 0;
writel_relaxed(v, &dma->reg_global->emulation_control);
v = readl_relaxed(&dma->reg_global->perf_control);
v |= ((dma->rx_timeout & DMA_RX_TIMEOUT_MASK) << DMA_RX_TIMEOUT_SHIFT);
writel_relaxed(v, &dma->reg_global->perf_control);
v = ((dma->tx_priority << DMA_TX_PRIO_SHIFT) |
(dma->rx_priority << DMA_RX_PRIO_SHIFT));
writel_relaxed(v, &dma->reg_global->priority_control);
/* Always enable all Rx channels. Rx paths are managed using flows */
for (i = 0; i < dma->max_rx_chan; i++)
writel_relaxed(DMA_ENABLE, &dma->reg_rx_chan[i].control);
for (i = 0; i < dma->logical_queue_managers; i++)
writel_relaxed(dma->qm_base_address[i],
&dma->reg_global->qm_base_address[i]);
spin_unlock(&dma->lock);
}
static void knav_dma_hw_destroy(struct knav_dma_device *dma)
{
int i;
unsigned v;
spin_lock(&dma->lock);
v = ~DMA_ENABLE & REG_MASK;
for (i = 0; i < dma->max_rx_chan; i++)
writel_relaxed(v, &dma->reg_rx_chan[i].control);
for (i = 0; i < dma->max_tx_chan; i++)
writel_relaxed(v, &dma->reg_tx_chan[i].control);
spin_unlock(&dma->lock);
}
static void dma_debug_show_channels(struct seq_file *s,
struct knav_dma_chan *chan)
{
int i;
seq_printf(s, "\t%s %d:\t",
((chan->direction == DMA_MEM_TO_DEV) ? "tx chan" : "rx flow"),
chan_number(chan));
if (chan->direction == DMA_MEM_TO_DEV) {
seq_printf(s, "einfo - %d, pswords - %d, priority - %d\n",
chan->cfg.u.tx.filt_einfo,
chan->cfg.u.tx.filt_pswords,
chan->cfg.u.tx.priority);
} else {
seq_printf(s, "einfo - %d, psinfo - %d, desc_type - %d\n",
chan->cfg.u.rx.einfo_present,
chan->cfg.u.rx.psinfo_present,
chan->cfg.u.rx.desc_type);
seq_printf(s, "\t\t\tdst_q: [%d], thresh: %d fdq: ",
chan->cfg.u.rx.dst_q,
chan->cfg.u.rx.thresh);
for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; i++)
seq_printf(s, "[%d]", chan->cfg.u.rx.fdq[i]);
seq_printf(s, "\n");
}
}
static void dma_debug_show_devices(struct seq_file *s,
struct knav_dma_device *dma)
{
struct knav_dma_chan *chan;
list_for_each_entry(chan, &dma->chan_list, list) {
if (atomic_read(&chan->ref_count))
dma_debug_show_channels(s, chan);
}
}
static int dma_debug_show(struct seq_file *s, void *v)
{
struct knav_dma_device *dma;
list_for_each_entry(dma, &kdev->list, list) {
if (atomic_read(&dma->ref_count)) {
seq_printf(s, "%s : max_tx_chan: (%d), max_rx_flows: (%d)\n",
dma->name, dma->max_tx_chan, dma->max_rx_flow);
dma_debug_show_devices(s, dma);
}
}
return 0;
}
static int knav_dma_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, dma_debug_show, NULL);
}
static const struct file_operations knav_dma_debug_ops = {
.open = knav_dma_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int of_channel_match_helper(struct device_node *np, const char *name,
const char **dma_instance)
{
struct of_phandle_args args;
struct device_node *dma_node;
int index;
dma_node = of_parse_phandle(np, "ti,navigator-dmas", 0);
if (!dma_node)
return -ENODEV;
*dma_instance = dma_node->name;
index = of_property_match_string(np, "ti,navigator-dma-names", name);
if (index < 0) {
dev_err(kdev->dev, "No 'ti,navigator-dma-names' propery\n");
return -ENODEV;
}
if (of_parse_phandle_with_fixed_args(np, "ti,navigator-dmas",
1, index, &args)) {
dev_err(kdev->dev, "Missing the pahndle args name %s\n", name);
return -ENODEV;
}
if (args.args[0] < 0) {
dev_err(kdev->dev, "Missing args for %s\n", name);
return -ENODEV;
}
return args.args[0];
}
/**
* knav_dma_open_channel() - try to setup an exclusive slave channel
* @dev: pointer to client device structure
* @name: slave channel name
* @config: dma configuration parameters
*
* Returns pointer to appropriate DMA channel on success or NULL.
*/
void *knav_dma_open_channel(struct device *dev, const char *name,
struct knav_dma_cfg *config)
{
struct knav_dma_chan *chan;
struct knav_dma_device *dma;
bool found = false;
int chan_num = -1;
const char *instance;
if (!kdev) {
pr_err("keystone-navigator-dma driver not registered\n");
return (void *)-EINVAL;
}
chan_num = of_channel_match_helper(dev->of_node, name, &instance);
if (chan_num < 0) {
dev_err(kdev->dev, "No DMA instace with name %s\n", name);
return (void *)-EINVAL;
}
dev_dbg(kdev->dev, "initializing %s channel %d from DMA %s\n",
config->direction == DMA_MEM_TO_DEV ? "transmit" :
config->direction == DMA_DEV_TO_MEM ? "receive" :
"unknown", chan_num, instance);
if (config->direction != DMA_MEM_TO_DEV &&
config->direction != DMA_DEV_TO_MEM) {
dev_err(kdev->dev, "bad direction\n");
return (void *)-EINVAL;
}
/* Look for correct dma instance */
list_for_each_entry(dma, &kdev->list, list) {
if (!strcmp(dma->name, instance)) {
found = true;
break;
}
}
if (!found) {
dev_err(kdev->dev, "No DMA instace with name %s\n", instance);
return (void *)-EINVAL;
}
/* Look for correct dma channel from dma instance */
found = false;
list_for_each_entry(chan, &dma->chan_list, list) {
if (config->direction == DMA_MEM_TO_DEV) {
if (chan->channel == chan_num) {
found = true;
break;
}
} else {
if (chan->flow == chan_num) {
found = true;
break;
}
}
}
if (!found) {
dev_err(kdev->dev, "channel %d is not in DMA %s\n",
chan_num, instance);
return (void *)-EINVAL;
}
if (atomic_read(&chan->ref_count) >= 1) {
if (!check_config(chan, config)) {
dev_err(kdev->dev, "channel %d config miss-match\n",
chan_num);
return (void *)-EINVAL;
}
}
if (atomic_inc_return(&chan->dma->ref_count) <= 1)
knav_dma_hw_init(chan->dma);
if (atomic_inc_return(&chan->ref_count) <= 1)
chan_start(chan, config);
dev_dbg(kdev->dev, "channel %d opened from DMA %s\n",
chan_num, instance);
return chan;
}
EXPORT_SYMBOL_GPL(knav_dma_open_channel);
/**
* knav_dma_close_channel() - Destroy a dma channel
*
* channel: dma channel handle
*
*/
void knav_dma_close_channel(void *channel)
{
struct knav_dma_chan *chan = channel;
if (!kdev) {
pr_err("keystone-navigator-dma driver not registered\n");
return;
}
if (atomic_dec_return(&chan->ref_count) <= 0)
chan_stop(chan);
if (atomic_dec_return(&chan->dma->ref_count) <= 0)
knav_dma_hw_destroy(chan->dma);
dev_dbg(kdev->dev, "channel %d or flow %d closed from DMA %s\n",
chan->channel, chan->flow, chan->dma->name);
}
EXPORT_SYMBOL_GPL(knav_dma_close_channel);
static void __iomem *pktdma_get_regs(struct knav_dma_device *dma,
struct device_node *node,
unsigned index, resource_size_t *_size)
{
struct device *dev = kdev->dev;
struct resource res;
void __iomem *regs;
int ret;
ret = of_address_to_resource(node, index, &res);
if (ret) {
dev_err(dev, "Can't translate of node(%s) address for index(%d)\n",
node->name, index);
return ERR_PTR(ret);
}
regs = devm_ioremap_resource(kdev->dev, &res);
if (IS_ERR(regs))
dev_err(dev, "Failed to map register base for index(%d) node(%s)\n",
index, node->name);
if (_size)
*_size = resource_size(&res);
return regs;
}
static int pktdma_init_rx_chan(struct knav_dma_chan *chan, u32 flow)
{
struct knav_dma_device *dma = chan->dma;
chan->flow = flow;
chan->reg_rx_flow = dma->reg_rx_flow + flow;
chan->channel = DMA_INVALID_ID;
dev_dbg(kdev->dev, "rx flow(%d) (%p)\n", chan->flow, chan->reg_rx_flow);
return 0;
}
static int pktdma_init_tx_chan(struct knav_dma_chan *chan, u32 channel)
{
struct knav_dma_device *dma = chan->dma;
chan->channel = channel;
chan->reg_chan = dma->reg_tx_chan + channel;
chan->reg_tx_sched = dma->reg_tx_sched + channel;
chan->flow = DMA_INVALID_ID;
dev_dbg(kdev->dev, "tx channel(%d) (%p)\n", chan->channel, chan->reg_chan);
return 0;
}
static int pktdma_init_chan(struct knav_dma_device *dma,
enum dma_transfer_direction dir,
unsigned chan_num)
{
struct device *dev = kdev->dev;
struct knav_dma_chan *chan;
int ret = -EINVAL;
chan = devm_kzalloc(dev, sizeof(*chan), GFP_KERNEL);
if (!chan)
return -ENOMEM;
INIT_LIST_HEAD(&chan->list);
chan->dma = dma;
chan->direction = DMA_NONE;
atomic_set(&chan->ref_count, 0);
spin_lock_init(&chan->lock);
if (dir == DMA_MEM_TO_DEV) {
chan->direction = dir;
ret = pktdma_init_tx_chan(chan, chan_num);
} else if (dir == DMA_DEV_TO_MEM) {
chan->direction = dir;
ret = pktdma_init_rx_chan(chan, chan_num);
} else {
dev_err(dev, "channel(%d) direction unknown\n", chan_num);
}
list_add_tail(&chan->list, &dma->chan_list);
return ret;
}
static int dma_init(struct device_node *cloud, struct device_node *dma_node)
{
unsigned max_tx_chan, max_rx_chan, max_rx_flow, max_tx_sched;
struct device_node *node = dma_node;
struct knav_dma_device *dma;
int ret, len, num_chan = 0;
resource_size_t size;
u32 timeout;
u32 i;
dma = devm_kzalloc(kdev->dev, sizeof(*dma), GFP_KERNEL);
if (!dma) {
dev_err(kdev->dev, "could not allocate driver mem\n");
return -ENOMEM;
}
INIT_LIST_HEAD(&dma->list);
INIT_LIST_HEAD(&dma->chan_list);
if (!of_find_property(cloud, "ti,navigator-cloud-address", &len)) {
dev_err(kdev->dev, "unspecified navigator cloud addresses\n");
return -ENODEV;
}
dma->logical_queue_managers = len / sizeof(u32);
if (dma->logical_queue_managers > DMA_MAX_QMS) {
dev_warn(kdev->dev, "too many queue mgrs(>%d) rest ignored\n",
dma->logical_queue_managers);
dma->logical_queue_managers = DMA_MAX_QMS;
}
ret = of_property_read_u32_array(cloud, "ti,navigator-cloud-address",
dma->qm_base_address,
dma->logical_queue_managers);
if (ret) {
dev_err(kdev->dev, "invalid navigator cloud addresses\n");
return -ENODEV;
}
dma->reg_global = pktdma_get_regs(dma, node, 0, &size);
if (!dma->reg_global)
return -ENODEV;
if (size < sizeof(struct reg_global)) {
dev_err(kdev->dev, "bad size %pa for global regs\n", &size);
return -ENODEV;
}
dma->reg_tx_chan = pktdma_get_regs(dma, node, 1, &size);
if (!dma->reg_tx_chan)
return -ENODEV;
max_tx_chan = size / sizeof(struct reg_chan);
dma->reg_rx_chan = pktdma_get_regs(dma, node, 2, &size);
if (!dma->reg_rx_chan)
return -ENODEV;
max_rx_chan = size / sizeof(struct reg_chan);
dma->reg_tx_sched = pktdma_get_regs(dma, node, 3, &size);
if (!dma->reg_tx_sched)
return -ENODEV;
max_tx_sched = size / sizeof(struct reg_tx_sched);
dma->reg_rx_flow = pktdma_get_regs(dma, node, 4, &size);
if (!dma->reg_rx_flow)
return -ENODEV;
max_rx_flow = size / sizeof(struct reg_rx_flow);
dma->rx_priority = DMA_PRIO_DEFAULT;
dma->tx_priority = DMA_PRIO_DEFAULT;
dma->enable_all = (of_get_property(node, "ti,enable-all", NULL) != NULL);
dma->loopback = (of_get_property(node, "ti,loop-back", NULL) != NULL);
ret = of_property_read_u32(node, "ti,rx-retry-timeout", &timeout);
if (ret < 0) {
dev_dbg(kdev->dev, "unspecified rx timeout using value %d\n",
DMA_RX_TIMEOUT_DEFAULT);
timeout = DMA_RX_TIMEOUT_DEFAULT;
}
dma->rx_timeout = timeout;
dma->max_rx_chan = max_rx_chan;
dma->max_rx_flow = max_rx_flow;
dma->max_tx_chan = min(max_tx_chan, max_tx_sched);
atomic_set(&dma->ref_count, 0);
strcpy(dma->name, node->name);
spin_lock_init(&dma->lock);
for (i = 0; i < dma->max_tx_chan; i++) {
if (pktdma_init_chan(dma, DMA_MEM_TO_DEV, i) >= 0)
num_chan++;
}
for (i = 0; i < dma->max_rx_flow; i++) {
if (pktdma_init_chan(dma, DMA_DEV_TO_MEM, i) >= 0)
num_chan++;
}
list_add_tail(&dma->list, &kdev->list);
/*
* For DSP software usecases or userpace transport software, setup all
* the DMA hardware resources.
*/
if (dma->enable_all) {
atomic_inc(&dma->ref_count);
knav_dma_hw_init(dma);
dma_hw_enable_all(dma);
}
dev_info(kdev->dev, "DMA %s registered %d logical channels, flows %d, tx chans: %d, rx chans: %d%s\n",
dma->name, num_chan, dma->max_rx_flow,
dma->max_tx_chan, dma->max_rx_chan,
dma->loopback ? ", loopback" : "");
return 0;
}
static int knav_dma_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = pdev->dev.of_node;
struct device_node *child;
int ret = 0;
if (!node) {
dev_err(&pdev->dev, "could not find device info\n");
return -EINVAL;
}
kdev = devm_kzalloc(dev,
sizeof(struct knav_dma_pool_device), GFP_KERNEL);
if (!kdev) {
dev_err(dev, "could not allocate driver mem\n");
return -ENOMEM;
}
kdev->dev = dev;
INIT_LIST_HEAD(&kdev->list);
pm_runtime_enable(kdev->dev);
ret = pm_runtime_get_sync(kdev->dev);
if (ret < 0) {
dev_err(kdev->dev, "unable to enable pktdma, err %d\n", ret);
return ret;
}
/* Initialise all packet dmas */
for_each_child_of_node(node, child) {
ret = dma_init(node, child);
if (ret) {
dev_err(&pdev->dev, "init failed with %d\n", ret);
break;
}
}
if (list_empty(&kdev->list)) {
dev_err(dev, "no valid dma instance\n");
return -ENODEV;
}
debugfs_create_file("knav_dma", S_IFREG | S_IRUGO, NULL, NULL,
&knav_dma_debug_ops);
return ret;
}
static int knav_dma_remove(struct platform_device *pdev)
{
struct knav_dma_device *dma;
list_for_each_entry(dma, &kdev->list, list) {
if (atomic_dec_return(&dma->ref_count) == 0)
knav_dma_hw_destroy(dma);
}
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
static struct of_device_id of_match[] = {
{ .compatible = "ti,keystone-navigator-dma", },
{},
};
MODULE_DEVICE_TABLE(of, of_match);
static struct platform_driver knav_dma_driver = {
.probe = knav_dma_probe,
.remove = knav_dma_remove,
.driver = {
.name = "keystone-navigator-dma",
.owner = THIS_MODULE,
.of_match_table = of_match,
},
};
module_platform_driver(knav_dma_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI Keystone Navigator Packet DMA driver");
MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com>");
MODULE_AUTHOR("Santosh Shilimkar <santosh.shilimkar@ti.com>");

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include/linux/soc/ti/knav_dma.h Normal file
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/*
* Copyright (C) 2014 Texas Instruments Incorporated
* Authors: Sandeep Nair <sandeep_n@ti.com
* Cyril Chemparathy <cyril@ti.com
Santosh Shilimkar <santosh.shilimkar@ti.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 version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__
#define __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__
/*
* PKTDMA descriptor manipulation macros for host packet descriptor
*/
#define MASK(x) (BIT(x) - 1)
#define KNAV_DMA_DESC_PKT_LEN_MASK MASK(22)
#define KNAV_DMA_DESC_PKT_LEN_SHIFT 0
#define KNAV_DMA_DESC_PS_INFO_IN_SOP BIT(22)
#define KNAV_DMA_DESC_PS_INFO_IN_DESC 0
#define KNAV_DMA_DESC_TAG_MASK MASK(8)
#define KNAV_DMA_DESC_SAG_HI_SHIFT 24
#define KNAV_DMA_DESC_STAG_LO_SHIFT 16
#define KNAV_DMA_DESC_DTAG_HI_SHIFT 8
#define KNAV_DMA_DESC_DTAG_LO_SHIFT 0
#define KNAV_DMA_DESC_HAS_EPIB BIT(31)
#define KNAV_DMA_DESC_NO_EPIB 0
#define KNAV_DMA_DESC_PSLEN_SHIFT 24
#define KNAV_DMA_DESC_PSLEN_MASK MASK(6)
#define KNAV_DMA_DESC_ERR_FLAG_SHIFT 20
#define KNAV_DMA_DESC_ERR_FLAG_MASK MASK(4)
#define KNAV_DMA_DESC_PSFLAG_SHIFT 16
#define KNAV_DMA_DESC_PSFLAG_MASK MASK(4)
#define KNAV_DMA_DESC_RETQ_SHIFT 0
#define KNAV_DMA_DESC_RETQ_MASK MASK(14)
#define KNAV_DMA_DESC_BUF_LEN_MASK MASK(22)
#define KNAV_DMA_NUM_EPIB_WORDS 4
#define KNAV_DMA_NUM_PS_WORDS 16
#define KNAV_DMA_FDQ_PER_CHAN 4
/* Tx channel scheduling priority */
enum knav_dma_tx_priority {
DMA_PRIO_HIGH = 0,
DMA_PRIO_MED_H,
DMA_PRIO_MED_L,
DMA_PRIO_LOW
};
/* Rx channel error handling mode during buffer starvation */
enum knav_dma_rx_err_mode {
DMA_DROP = 0,
DMA_RETRY
};
/* Rx flow size threshold configuration */
enum knav_dma_rx_thresholds {
DMA_THRESH_NONE = 0,
DMA_THRESH_0 = 1,
DMA_THRESH_0_1 = 3,
DMA_THRESH_0_1_2 = 7
};
/* Descriptor type */
enum knav_dma_desc_type {
DMA_DESC_HOST = 0,
DMA_DESC_MONOLITHIC = 2
};
/**
* struct knav_dma_tx_cfg: Tx channel configuration
* @filt_einfo: Filter extended packet info
* @filt_pswords: Filter PS words present
* @knav_dma_tx_priority: Tx channel scheduling priority
*/
struct knav_dma_tx_cfg {
bool filt_einfo;
bool filt_pswords;
enum knav_dma_tx_priority priority;
};
/**
* struct knav_dma_rx_cfg: Rx flow configuration
* @einfo_present: Extended packet info present
* @psinfo_present: PS words present
* @knav_dma_rx_err_mode: Error during buffer starvation
* @knav_dma_desc_type: Host or Monolithic desc
* @psinfo_at_sop: PS word located at start of packet
* @sop_offset: Start of packet offset
* @dst_q: Destination queue for a given flow
* @thresh: Rx flow size threshold
* @fdq[]: Free desc Queue array
* @sz_thresh0: RX packet size threshold 0
* @sz_thresh1: RX packet size threshold 1
* @sz_thresh2: RX packet size threshold 2
*/
struct knav_dma_rx_cfg {
bool einfo_present;
bool psinfo_present;
enum knav_dma_rx_err_mode err_mode;
enum knav_dma_desc_type desc_type;
bool psinfo_at_sop;
unsigned int sop_offset;
unsigned int dst_q;
enum knav_dma_rx_thresholds thresh;
unsigned int fdq[KNAV_DMA_FDQ_PER_CHAN];
unsigned int sz_thresh0;
unsigned int sz_thresh1;
unsigned int sz_thresh2;
};
/**
* struct knav_dma_cfg: Pktdma channel configuration
* @sl_cfg: Slave configuration
* @tx: Tx channel configuration
* @rx: Rx flow configuration
*/
struct knav_dma_cfg {
enum dma_transfer_direction direction;
union {
struct knav_dma_tx_cfg tx;
struct knav_dma_rx_cfg rx;
} u;
};
/**
* struct knav_dma_desc: Host packet descriptor layout
* @desc_info: Descriptor information like id, type, length
* @tag_info: Flow tag info written in during RX
* @packet_info: Queue Manager, policy, flags etc
* @buff_len: Buffer length in bytes
* @buff: Buffer pointer
* @next_desc: For chaining the descriptors
* @orig_len: length since 'buff_len' can be overwritten
* @orig_buff: buff pointer since 'buff' can be overwritten
* @epib: Extended packet info block
* @psdata: Protocol specific
*/
struct knav_dma_desc {
u32 desc_info;
u32 tag_info;
u32 packet_info;
u32 buff_len;
u32 buff;
u32 next_desc;
u32 orig_len;
u32 orig_buff;
u32 epib[KNAV_DMA_NUM_EPIB_WORDS];
u32 psdata[KNAV_DMA_NUM_PS_WORDS];
u32 pad[4];
} ____cacheline_aligned;
#ifdef CONFIG_KEYSTONE_NAVIGATOR_DMA
void *knav_dma_open_channel(struct device *dev, const char *name,
struct knav_dma_cfg *config);
void knav_dma_close_channel(void *channel);
#else
static inline void *knav_dma_open_channel(struct device *dev, const char *name,
struct knav_dma_cfg *config)
{
return (void *) NULL;
}
static inline void knav_dma_close_channel(void *channel)
{}
#endif
#endif /* __SOC_TI_KEYSTONE_NAVIGATOR_DMA_H__ */