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Commit ce3a1ab7 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Vinod Koul
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dma: shdma: convert to the shdma base library 

The shdma base library has originally been extracted from the shdma driver,
which now can be converted to actually use it.
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
parent b8373147
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Showing with 302 additions and 897 deletions
drivers/dma/sh/shdma.c
View file @ ce3a1ab7
......@@ -3,6 +3,7 @@
*
* base is drivers/dma/flsdma.c
*
* Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
......@@ -34,18 +35,12 @@
#include "../dmaengine.h"
#include "shdma.h"
/* DMA descriptor control */
enum sh_dmae_desc_status {
DESC_IDLE,
DESC_PREPARED,
DESC_SUBMITTED,
DESC_COMPLETED, /* completed, have to call callback */
DESC_WAITING, /* callback called, waiting for ack / re-submit */
};
#define SH_DMAE_DRV_NAME "sh-dma-engine"
#define NR_DESCS_PER_CHANNEL 32
/* Default MEMCPY transfer size = 2^2 = 4 bytes */
#define LOG2_DEFAULT_XFER_SIZE 2
#define SH_DMA_SLAVE_NUMBER 256
#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1)
/*
* Used for write-side mutual exclusion for the global device list,
......@@ -54,18 +49,12 @@ enum sh_dmae_desc_status {
static DEFINE_SPINLOCK(sh_dmae_lock);
static LIST_HEAD(sh_dmae_devices);
/* A bitmask with bits enough for enum sh_dmae_slave_chan_id */
static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)];
static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan);
static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data)
{
struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
__raw_writel(data, shdev->chan_reg +
shdev->pdata->channel[sh_dc->id].chclr_offset);
shdev->pdata->channel[sh_dc->shdma_chan.id].chclr_offset);
}
static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
......@@ -155,11 +144,11 @@ static int sh_dmae_rst(struct sh_dmae_device *shdev)
spin_unlock_irqrestore(&sh_dmae_lock, flags);
if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
dev_warn(shdev->common.dev, "Can't initialize DMAOR.\n");
dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n");
return -EIO;
}
if (shdev->pdata->dmaor_init & ~dmaor)
dev_warn(shdev->common.dev,
dev_warn(shdev->shdma_dev.dma_dev.dev,
"DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
dmaor, shdev->pdata->dmaor_init);
return 0;
......@@ -224,15 +213,6 @@ static void dmae_start(struct sh_dmae_chan *sh_chan)
chcr_write(sh_chan, chcr & ~CHCR_TE);
}
static void dmae_halt(struct sh_dmae_chan *sh_chan)
{
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
u32 chcr = chcr_read(sh_chan);
chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
chcr_write(sh_chan, chcr);
}
static void dmae_init(struct sh_dmae_chan *sh_chan)
{
/*
......@@ -261,7 +241,7 @@ static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
{
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
struct sh_dmae_pdata *pdata = shdev->pdata;
const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id];
const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id];
u16 __iomem *addr = shdev->dmars;
unsigned int shift = chan_pdata->dmars_bit;
......@@ -282,706 +262,142 @@ static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
return 0;
}
static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
static void sh_dmae_start_xfer(struct shdma_chan *schan,
struct shdma_desc *sdesc)
{
struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c;
struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
struct sh_dmae_slave *param = tx->chan->private;
dma_async_tx_callback callback = tx->callback;
dma_cookie_t cookie;
bool power_up;
spin_lock_irq(&sh_chan->desc_lock);
if (list_empty(&sh_chan->ld_queue))
power_up = true;
else
power_up = false;
cookie = dma_cookie_assign(tx);
/* Mark all chunks of this descriptor as submitted, move to the queue */
list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
/*
* All chunks are on the global ld_free, so, we have to find
* the end of the chain ourselves
*/
if (chunk != desc && (chunk->mark == DESC_IDLE ||
chunk->async_tx.cookie > 0 ||
chunk->async_tx.cookie == -EBUSY ||
&chunk->node == &sh_chan->ld_free))
break;
chunk->mark = DESC_SUBMITTED;
/* Callback goes to the last chunk */
chunk->async_tx.callback = NULL;
chunk->cookie = cookie;
list_move_tail(&chunk->node, &sh_chan->ld_queue);
last = chunk;
}
last->async_tx.callback = callback;
last->async_tx.callback_param = tx->callback_param;
dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n",
tx->cookie, &last->async_tx, sh_chan->id,
desc->hw.sar, desc->hw.tcr, desc->hw.dar);
if (power_up) {
sh_chan->pm_state = DMAE_PM_BUSY;
pm_runtime_get(sh_chan->dev);
spin_unlock_irq(&sh_chan->desc_lock);
struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
shdma_chan);
struct sh_dmae_desc *sh_desc = container_of(sdesc,
struct sh_dmae_desc, shdma_desc);
dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n",
sdesc->async_tx.cookie, sh_chan->shdma_chan.id,
sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar);
/* Get the ld start address from ld_queue */
dmae_set_reg(sh_chan, &sh_desc->hw);
dmae_start(sh_chan);
}
pm_runtime_barrier(sh_chan->dev);
static bool sh_dmae_channel_busy(struct shdma_chan *schan)
{
struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
shdma_chan);
return dmae_is_busy(sh_chan);
}
spin_lock_irq(&sh_chan->desc_lock);
static void sh_dmae_setup_xfer(struct shdma_chan *schan,
struct shdma_slave *sslave)
{
struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
shdma_chan);
/* Have we been reset, while waiting? */
if (sh_chan->pm_state != DMAE_PM_ESTABLISHED) {
dev_dbg(sh_chan->dev, "Bring up channel %d\n",
sh_chan->id);
if (param) {
if (sslave) {
struct sh_dmae_slave *slave = container_of(sslave,
struct sh_dmae_slave, shdma_slave);
const struct sh_dmae_slave_config *cfg =
param->config;
slave->config;
dmae_set_dmars(sh_chan, cfg->mid_rid);
dmae_set_chcr(sh_chan, cfg->chcr);
} else {
dmae_init(sh_chan);
}
if (sh_chan->pm_state == DMAE_PM_PENDING)
sh_chan_xfer_ld_queue(sh_chan);
sh_chan->pm_state = DMAE_PM_ESTABLISHED;
}
} else {
sh_chan->pm_state = DMAE_PM_PENDING;
}
spin_unlock_irq(&sh_chan->desc_lock);
return cookie;
}
/* Called with desc_lock held */
static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
{
struct sh_desc *desc;
list_for_each_entry(desc, &sh_chan->ld_free, node)
if (desc->mark != DESC_PREPARED) {
BUG_ON(desc->mark != DESC_IDLE);
list_del(&desc->node);
return desc;
}
return NULL;
}
static const struct sh_dmae_slave_config *sh_dmae_find_slave(
struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param)
static const struct sh_dmae_slave_config *dmae_find_slave(
struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *slave)
{
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
struct sh_dmae_pdata *pdata = shdev->pdata;
int i;
if (param->slave_id >= SH_DMA_SLAVE_NUMBER)
return NULL;
for (i = 0; i < pdata->slave_num; i++)
if (pdata->slave[i].slave_id == param->slave_id)
return pdata->slave + i;
return NULL;
}
static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
{
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
struct sh_desc *desc;
struct sh_dmae_slave *param = chan->private;
int ret;
/*
* This relies on the guarantee from dmaengine that alloc_chan_resources
* never runs concurrently with itself or free_chan_resources.
*/
if (param) {
const struct sh_dmae_slave_config *cfg;
cfg = sh_dmae_find_slave(sh_chan, param);
if (!cfg) {
ret = -EINVAL;
goto efindslave;
}
if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) {
ret = -EBUSY;
goto etestused;
}
param->config = cfg;
}
while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
if (!desc)
break;
dma_async_tx_descriptor_init(&desc->async_tx,
&sh_chan->common);
desc->async_tx.tx_submit = sh_dmae_tx_submit;
desc->mark = DESC_IDLE;
list_add(&desc->node, &sh_chan->ld_free);
sh_chan->descs_allocated++;
}
if (!sh_chan->descs_allocated) {
ret = -ENOMEM;
goto edescalloc;
}
return sh_chan->descs_allocated;
edescalloc:
if (param)
clear_bit(param->slave_id, sh_dmae_slave_used);
etestused:
efindslave:
chan->private = NULL;
return ret;
}
/*
* sh_dma_free_chan_resources - Free all resources of the channel.
*/
static void sh_dmae_free_chan_resources(struct dma_chan *chan)
{
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
struct sh_desc *desc, *_desc;
LIST_HEAD(list);
/* Protect against ISR */
spin_lock_irq(&sh_chan->desc_lock);
dmae_halt(sh_chan);
spin_unlock_irq(&sh_chan->desc_lock);
/* Now no new interrupts will occur */
/* Prepared and not submitted descriptors can still be on the queue */
if (!list_empty(&sh_chan->ld_queue))
sh_dmae_chan_ld_cleanup(sh_chan, true);
if (chan->private) {
/* The caller is holding dma_list_mutex */
struct sh_dmae_slave *param = chan->private;
clear_bit(param->slave_id, sh_dmae_slave_used);
chan->private = NULL;
}
spin_lock_irq(&sh_chan->desc_lock);
list_splice_init(&sh_chan->ld_free, &list);
sh_chan->descs_allocated = 0;
spin_unlock_irq(&sh_chan->desc_lock);
list_for_each_entry_safe(desc, _desc, &list, node)
kfree(desc);
}
/**
* sh_dmae_add_desc - get, set up and return one transfer descriptor
* @sh_chan: DMA channel
* @flags: DMA transfer flags
* @dest: destination DMA address, incremented when direction equals
* DMA_DEV_TO_MEM
* @src: source DMA address, incremented when direction equals
* DMA_MEM_TO_DEV
* @len: DMA transfer length
* @first: if NULL, set to the current descriptor and cookie set to -EBUSY
* @direction: needed for slave DMA to decide which address to keep constant,
* equals DMA_MEM_TO_MEM for MEMCPY
* Returns 0 or an error
* Locks: called with desc_lock held
*/
static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan,
unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len,
struct sh_desc **first, enum dma_transfer_direction direction)
{
struct sh_desc *new;
size_t copy_size;
if (!*len)
return NULL;
/* Allocate the link descriptor from the free list */
new = sh_dmae_get_desc(sh_chan);
if (!new) {
dev_err(sh_chan->dev, "No free link descriptor available\n");
return NULL;
}
copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1);
new->hw.sar = *src;
new->hw.dar = *dest;
new->hw.tcr = copy_size;
if (!*first) {
/* First desc */
new->async_tx.cookie = -EBUSY;
*first = new;
} else {
/* Other desc - invisible to the user */
new->async_tx.cookie = -EINVAL;
}
dev_dbg(sh_chan->dev,
"chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n",
copy_size, *len, *src, *dest, &new->async_tx,
new->async_tx.cookie, sh_chan->xmit_shift);
new->mark = DESC_PREPARED;
new->async_tx.flags = flags;
new->direction = direction;
*len -= copy_size;
if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV)
*src += copy_size;
if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM)
*dest += copy_size;
return new;
}
/*
* sh_dmae_prep_sg - prepare transfer descriptors from an SG list
*
* Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
* converted to scatter-gather to guarantee consistent locking and a correct
* list manipulation. For slave DMA direction carries the usual meaning, and,
* logically, the SG list is RAM and the addr variable contains slave address,
* e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM
* and the SG list contains only one element and points at the source buffer.
*/
static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan,
struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
enum dma_transfer_direction direction, unsigned long flags)
{
struct scatterlist *sg;
struct sh_desc *first = NULL, *new = NULL /* compiler... */;
LIST_HEAD(tx_list);
int chunks = 0;
unsigned long irq_flags;
int i;
if (!sg_len)
if (slave->shdma_slave.slave_id >= SH_DMA_SLAVE_NUMBER)
return NULL;
for_each_sg(sgl, sg, sg_len, i)
chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) /
(SH_DMA_TCR_MAX + 1);
/* Have to lock the whole loop to protect against concurrent release */
spin_lock_irqsave(&sh_chan->desc_lock, irq_flags);
/*
* Chaining:
* first descriptor is what user is dealing with in all API calls, its
* cookie is at first set to -EBUSY, at tx-submit to a positive
* number
* if more than one chunk is needed further chunks have cookie = -EINVAL
* the last chunk, if not equal to the first, has cookie = -ENOSPC
* all chunks are linked onto the tx_list head with their .node heads
* only during this function, then they are immediately spliced
* back onto the free list in form of a chain
*/
for_each_sg(sgl, sg, sg_len, i) {
dma_addr_t sg_addr = sg_dma_address(sg);
size_t len = sg_dma_len(sg);
if (!len)
goto err_get_desc;
do {
dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n",
i, sg, len, (unsigned long long)sg_addr);
if (direction == DMA_DEV_TO_MEM)
new = sh_dmae_add_desc(sh_chan, flags,
&sg_addr, addr, &len, &first,
direction);
else
new = sh_dmae_add_desc(sh_chan, flags,
addr, &sg_addr, &len, &first,
direction);
if (!new)
goto err_get_desc;
new->chunks = chunks--;
list_add_tail(&new->node, &tx_list);
} while (len);
}
if (new != first)
new->async_tx.cookie = -ENOSPC;
/* Put them back on the free list, so, they don't get lost */
list_splice_tail(&tx_list, &sh_chan->ld_free);
spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags);
return &first->async_tx;
err_get_desc:
list_for_each_entry(new, &tx_list, node)
new->mark = DESC_IDLE;
list_splice(&tx_list, &sh_chan->ld_free);
spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags);
for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
if (cfg->slave_id == slave->shdma_slave.slave_id)
return cfg;
return NULL;
}
static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
size_t len, unsigned long flags)
static int sh_dmae_set_slave(struct shdma_chan *schan,
struct shdma_slave *sslave)
{
struct sh_dmae_chan *sh_chan;
struct scatterlist sg;
if (!chan || !len)
return NULL;
sh_chan = to_sh_chan(chan);
sg_init_table(&sg, 1);
sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
offset_in_page(dma_src));
sg_dma_address(&sg) = dma_src;
sg_dma_len(&sg) = len;
return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM,
flags);
}
static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
void *context)
{
struct sh_dmae_slave *param;
struct sh_dmae_chan *sh_chan;
dma_addr_t slave_addr;
if (!chan)
return NULL;
sh_chan = to_sh_chan(chan);
param = chan->private;
/* Someone calling slave DMA on a public channel? */
if (!param || !sg_len) {
dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n",
__func__, param, sg_len, param ? param->slave_id : -1);
return NULL;
}
slave_addr = param->config->addr;
/*
* if (param != NULL), this is a successfully requested slave channel,
* therefore param->config != NULL too.
*/
return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr,
direction, flags);
}
static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
unsigned long arg)
{
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
unsigned long flags;
/* Only supports DMA_TERMINATE_ALL */
if (cmd != DMA_TERMINATE_ALL)
return -ENXIO;
if (!chan)
return -EINVAL;
spin_lock_irqsave(&sh_chan->desc_lock, flags);
dmae_halt(sh_chan);
if (!list_empty(&sh_chan->ld_queue)) {
/* Record partial transfer */
struct sh_desc *desc = list_entry(sh_chan->ld_queue.next,
struct sh_desc, node);
desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
sh_chan->xmit_shift;
}
spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
shdma_chan);
struct sh_dmae_slave *slave = container_of(sslave, struct sh_dmae_slave,
shdma_slave);
const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave);
if (!cfg)
return -ENODEV;
sh_dmae_chan_ld_cleanup(sh_chan, true);
slave->config = cfg;
return 0;
}
static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
static void dmae_halt(struct sh_dmae_chan *sh_chan)
{
struct sh_desc *desc, *_desc;
/* Is the "exposed" head of a chain acked? */
bool head_acked = false;
dma_cookie_t cookie = 0;
dma_async_tx_callback callback = NULL;
void *param = NULL;
unsigned long flags;
spin_lock_irqsave(&sh_chan->desc_lock, flags);
list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
struct dma_async_tx_descriptor *tx = &desc->async_tx;
BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
BUG_ON(desc->mark != DESC_SUBMITTED &&
desc->mark != DESC_COMPLETED &&
desc->mark != DESC_WAITING);
/*
* queue is ordered, and we use this loop to (1) clean up all
* completed descriptors, and to (2) update descriptor flags of
* any chunks in a (partially) completed chain
*/
if (!all && desc->mark == DESC_SUBMITTED &&
desc->cookie != cookie)
break;
if (tx->cookie > 0)
cookie = tx->cookie;
if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
if (sh_chan->common.completed_cookie != desc->cookie - 1)
dev_dbg(sh_chan->dev,
"Completing cookie %d, expected %d\n",
desc->cookie,
sh_chan->common.completed_cookie + 1);
sh_chan->common.completed_cookie = desc->cookie;
}
/* Call callback on the last chunk */
if (desc->mark == DESC_COMPLETED && tx->callback) {
desc->mark = DESC_WAITING;
callback = tx->callback;
param = tx->callback_param;
dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n",
tx->cookie, tx, sh_chan->id);
BUG_ON(desc->chunks != 1);
break;
}
if (tx->cookie > 0 || tx->cookie == -EBUSY) {
if (desc->mark == DESC_COMPLETED) {
BUG_ON(tx->cookie < 0);
desc->mark = DESC_WAITING;
}
head_acked = async_tx_test_ack(tx);
} else {
switch (desc->mark) {
case DESC_COMPLETED:
desc->mark = DESC_WAITING;
/* Fall through */
case DESC_WAITING:
if (head_acked)
async_tx_ack(&desc->async_tx);
}
}
dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n",
tx, tx->cookie);
if (((desc->mark == DESC_COMPLETED ||
desc->mark == DESC_WAITING) &&
async_tx_test_ack(&desc->async_tx)) || all) {
/* Remove from ld_queue list */
desc->mark = DESC_IDLE;
list_move(&desc->node, &sh_chan->ld_free);
if (list_empty(&sh_chan->ld_queue)) {
dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id);
pm_runtime_put(sh_chan->dev);
}
}
}
if (all && !callback)
/*
* Terminating and the loop completed normally: forgive
* uncompleted cookies
*/
sh_chan->common.completed_cookie = sh_chan->common.cookie;
spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
if (callback)
callback(param);
return callback;
}
struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
u32 chcr = chcr_read(sh_chan);
/*
* sh_chan_ld_cleanup - Clean up link descriptors
*
* This function cleans up the ld_queue of DMA channel.
*/
static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
{
while (__ld_cleanup(sh_chan, all))
;
chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
chcr_write(sh_chan, chcr);
}
/* Called under spin_lock_irq(&sh_chan->desc_lock) */
static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
static int sh_dmae_desc_setup(struct shdma_chan *schan,
struct shdma_desc *sdesc,
dma_addr_t src, dma_addr_t dst, size_t *len)
{
struct sh_desc *desc;
struct sh_dmae_desc *sh_desc = container_of(sdesc,
struct sh_dmae_desc, shdma_desc);
/* DMA work check */
if (dmae_is_busy(sh_chan))
return;
/* Find the first not transferred descriptor */
list_for_each_entry(desc, &sh_chan->ld_queue, node)
if (desc->mark == DESC_SUBMITTED) {
dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n",
desc->async_tx.cookie, sh_chan->id,
desc->hw.tcr, desc->hw.sar, desc->hw.dar);
/* Get the ld start address from ld_queue */
dmae_set_reg(sh_chan, &desc->hw);
dmae_start(sh_chan);
break;
}
}
if (*len > schan->max_xfer_len)
*len = schan->max_xfer_len;
static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
{
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
sh_desc->hw.sar = src;
sh_desc->hw.dar = dst;
sh_desc->hw.tcr = *len;
spin_lock_irq(&sh_chan->desc_lock);
if (sh_chan->pm_state == DMAE_PM_ESTABLISHED)
sh_chan_xfer_ld_queue(sh_chan);
else
sh_chan->pm_state = DMAE_PM_PENDING;
spin_unlock_irq(&sh_chan->desc_lock);
return 0;
}
static enum dma_status sh_dmae_tx_status(struct dma_chan *chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
static void sh_dmae_halt(struct shdma_chan *schan)
{
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
enum dma_status status;
unsigned long flags;
sh_dmae_chan_ld_cleanup(sh_chan, false);
spin_lock_irqsave(&sh_chan->desc_lock, flags);
status = dma_cookie_status(chan, cookie, txstate);
/*
* If we don't find cookie on the queue, it has been aborted and we have
* to report error
*/
if (status != DMA_SUCCESS) {
struct sh_desc *desc;
status = DMA_ERROR;
list_for_each_entry(desc, &sh_chan->ld_queue, node)
if (desc->cookie == cookie) {
status = DMA_IN_PROGRESS;
break;
}
}
spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
return status;
struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
shdma_chan);
dmae_halt(sh_chan);
}
static irqreturn_t sh_dmae_interrupt(int irq, void *data)
static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq)
{
irqreturn_t ret = IRQ_NONE;
struct sh_dmae_chan *sh_chan = data;
u32 chcr;
spin_lock(&sh_chan->desc_lock);
struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
shdma_chan);
chcr = chcr_read(sh_chan);
if (!(chcr_read(sh_chan) & CHCR_TE))
return false;
if (chcr & CHCR_TE) {
/* DMA stop */
dmae_halt(sh_chan);
ret = IRQ_HANDLED;
tasklet_schedule(&sh_chan->tasklet);
}
spin_unlock(&sh_chan->desc_lock);
return ret;
return true;
}
/* Called from error IRQ or NMI */
static bool sh_dmae_reset(struct sh_dmae_device *shdev)
{
unsigned int handled = 0;
int i;
bool ret;
/* halt the dma controller */
sh_dmae_ctl_stop(shdev);
/* We cannot detect, which channel caused the error, have to reset all */
for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) {
struct sh_dmae_chan *sh_chan = shdev->chan[i];
struct sh_desc *desc;
LIST_HEAD(dl);
if (!sh_chan)
continue;
spin_lock(&sh_chan->desc_lock);
/* Stop the channel */
dmae_halt(sh_chan);
list_splice_init(&sh_chan->ld_queue, &dl);
if (!list_empty(&dl)) {
dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id);
pm_runtime_put(sh_chan->dev);
}
sh_chan->pm_state = DMAE_PM_ESTABLISHED;
spin_unlock(&sh_chan->desc_lock);
/* Complete all */
list_for_each_entry(desc, &dl, node) {
struct dma_async_tx_descriptor *tx = &desc->async_tx;
desc->mark = DESC_IDLE;
if (tx->callback)
tx->callback(tx->callback_param);
}
spin_lock(&sh_chan->desc_lock);
list_splice(&dl, &sh_chan->ld_free);
spin_unlock(&sh_chan->desc_lock);
handled++;
}
ret = shdma_reset(&shdev->shdma_dev);
sh_dmae_rst(shdev);
return !!handled;
return ret;
}
static irqreturn_t sh_dmae_err(int irq, void *data)
......@@ -991,35 +407,24 @@ static irqreturn_t sh_dmae_err(int irq, void *data)
if (!(dmaor_read(shdev) & DMAOR_AE))
return IRQ_NONE;
sh_dmae_reset(data);
sh_dmae_reset(shdev);
return IRQ_HANDLED;
}
static void dmae_do_tasklet(unsigned long data)
static bool sh_dmae_desc_completed(struct shdma_chan *schan,
struct shdma_desc *sdesc)
{
struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
struct sh_desc *desc;
struct sh_dmae_chan *sh_chan = container_of(schan,
struct sh_dmae_chan, shdma_chan);
struct sh_dmae_desc *sh_desc = container_of(sdesc,
struct sh_dmae_desc, shdma_desc);
u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
spin_lock_irq(&sh_chan->desc_lock);
list_for_each_entry(desc, &sh_chan->ld_queue, node) {
if (desc->mark == DESC_SUBMITTED &&
((desc->direction == DMA_DEV_TO_MEM &&
(desc->hw.dar + desc->hw.tcr) == dar_buf) ||
(desc->hw.sar + desc->hw.tcr) == sar_buf)) {
dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
desc->async_tx.cookie, &desc->async_tx,
desc->hw.dar);
desc->mark = DESC_COMPLETED;
break;
}
}
/* Next desc */
sh_chan_xfer_ld_queue(sh_chan);
spin_unlock_irq(&sh_chan->desc_lock);
sh_dmae_chan_ld_cleanup(sh_chan, false);
return (sdesc->direction == DMA_DEV_TO_MEM &&
(sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) ||
(sdesc->direction != DMA_DEV_TO_MEM &&
(sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf);
}
static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
......@@ -1073,97 +478,174 @@ static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
int irq, unsigned long flags)
{
int err;
const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
struct platform_device *pdev = to_platform_device(shdev->common.dev);
struct sh_dmae_chan *new_sh_chan;
struct shdma_dev *sdev = &shdev->shdma_dev;
struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);
struct sh_dmae_chan *sh_chan;
struct shdma_chan *schan;
int err;
/* alloc channel */
new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
if (!new_sh_chan) {
dev_err(shdev->common.dev,
sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
if (!sh_chan) {
dev_err(sdev->dma_dev.dev,
"No free memory for allocating dma channels!\n");
return -ENOMEM;
}
new_sh_chan->pm_state = DMAE_PM_ESTABLISHED;
/* reference struct dma_device */
new_sh_chan->common.device = &shdev->common;
dma_cookie_init(&new_sh_chan->common);
new_sh_chan->dev = shdev->common.dev;
new_sh_chan->id = id;
new_sh_chan->irq = irq;
new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
/* Init DMA tasklet */
tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
(unsigned long)new_sh_chan);
spin_lock_init(&new_sh_chan->desc_lock);
schan = &sh_chan->shdma_chan;
schan->max_xfer_len = SH_DMA_TCR_MAX + 1;
/* Init descripter manage list */
INIT_LIST_HEAD(&new_sh_chan->ld_queue);
INIT_LIST_HEAD(&new_sh_chan->ld_free);
shdma_chan_probe(sdev, schan, id);
/* Add the channel to DMA device channel list */
list_add_tail(&new_sh_chan->common.device_node,
&shdev->common.channels);
shdev->common.chancnt++;
sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
/* set up channel irq */
if (pdev->id >= 0)
snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
"sh-dmae%d.%d", pdev->id, new_sh_chan->id);
snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
"sh-dmae%d.%d", pdev->id, id);
else
snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
"sh-dma%d", new_sh_chan->id);
snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
"sh-dma%d", id);
/* set up channel irq */
err = request_irq(irq, &sh_dmae_interrupt, flags,
new_sh_chan->dev_id, new_sh_chan);
err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id);
if (err) {
dev_err(shdev->common.dev, "DMA channel %d request_irq error "
"with return %d\n", id, err);
dev_err(sdev->dma_dev.dev,
"DMA channel %d request_irq error %d\n",
id, err);
goto err_no_irq;
}
shdev->chan[id] = new_sh_chan;
shdev->chan[id] = sh_chan;
return 0;
err_no_irq:
/* remove from dmaengine device node */
list_del(&new_sh_chan->common.device_node);
kfree(new_sh_chan);
shdma_chan_remove(schan);
kfree(sh_chan);
return err;
}
static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
{
struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
struct shdma_chan *schan;
int i;
for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
if (shdev->chan[i]) {
struct sh_dmae_chan *sh_chan = shdev->chan[i];
shdma_for_each_chan(schan, &shdev->shdma_dev, i) {
struct sh_dmae_chan *sh_chan = container_of(schan,
struct sh_dmae_chan, shdma_chan);
BUG_ON(!schan);
free_irq(sh_chan->irq, sh_chan);
shdma_free_irq(&sh_chan->shdma_chan);
list_del(&sh_chan->common.device_node);
shdma_chan_remove(schan);
kfree(sh_chan);
shdev->chan[i] = NULL;
}
dma_dev->chancnt = 0;
}
static void sh_dmae_shutdown(struct platform_device *pdev)
{
struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
sh_dmae_ctl_stop(shdev);
}
static int sh_dmae_runtime_suspend(struct device *dev)
{
return 0;
}
static int sh_dmae_runtime_resume(struct device *dev)
{
struct sh_dmae_device *shdev = dev_get_drvdata(dev);
return sh_dmae_rst(shdev);
}
#ifdef CONFIG_PM
static int sh_dmae_suspend(struct device *dev)
{
return 0;
}
static int sh_dmae_resume(struct device *dev)
{
struct sh_dmae_device *shdev = dev_get_drvdata(dev);
int i, ret;
ret = sh_dmae_rst(shdev);
if (ret < 0)
dev_err(dev, "Failed to reset!\n");
for (i = 0; i < shdev->pdata->channel_num; i++) {
struct sh_dmae_chan *sh_chan = shdev->chan[i];
struct sh_dmae_slave *param = sh_chan->shdma_chan.dma_chan.private;
if (!sh_chan->shdma_chan.desc_num)
continue;
if (param) {
const struct sh_dmae_slave_config *cfg = param->config;
dmae_set_dmars(sh_chan, cfg->mid_rid);
dmae_set_chcr(sh_chan, cfg->chcr);
} else {
dmae_init(sh_chan);
}
}
shdev->common.chancnt = 0;
return 0;
}
#else
#define sh_dmae_suspend NULL
#define sh_dmae_resume NULL
#endif
static int __init sh_dmae_probe(struct platform_device *pdev)
const struct dev_pm_ops sh_dmae_pm = {
.suspend = sh_dmae_suspend,
.resume = sh_dmae_resume,
.runtime_suspend = sh_dmae_runtime_suspend,
.runtime_resume = sh_dmae_runtime_resume,
};
static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan)
{
struct sh_dmae_slave *param = schan->dma_chan.private;
/*
* Implicit BUG_ON(!param)
* if (param != NULL), this is a successfully requested slave channel,
* therefore param->config != NULL too.
*/
return param->config->addr;
}
static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i)
{
return &((struct sh_dmae_desc *)buf)[i].shdma_desc;
}
static const struct shdma_ops sh_dmae_shdma_ops = {
.desc_completed = sh_dmae_desc_completed,
.halt_channel = sh_dmae_halt,
.channel_busy = sh_dmae_channel_busy,
.slave_addr = sh_dmae_slave_addr,
.desc_setup = sh_dmae_desc_setup,
.set_slave = sh_dmae_set_slave,
.setup_xfer = sh_dmae_setup_xfer,
.start_xfer = sh_dmae_start_xfer,
.embedded_desc = sh_dmae_embedded_desc,
.chan_irq = sh_dmae_chan_irq,
};
static int __devinit sh_dmae_probe(struct platform_device *pdev)
{
struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
unsigned long irqflags = IRQF_DISABLED,
chan_flag[SH_DMAC_MAX_CHANNELS] = {};
int errirq, chan_irq[SH_DMAC_MAX_CHANNELS];
chan_flag[SH_DMAE_MAX_CHANNELS] = {};
int errirq, chan_irq[SH_DMAE_MAX_CHANNELS];
int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
struct sh_dmae_device *shdev;
struct dma_device *dma_dev;
struct resource *chan, *dmars, *errirq_res, *chanirq_res;
/* get platform data */
......@@ -1211,6 +693,8 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
goto ealloc;
}
dma_dev = &shdev->shdma_dev.dma_dev;
shdev->chan_reg = ioremap(chan->start, resource_size(chan));
if (!shdev->chan_reg)
goto emapchan;
......@@ -1220,8 +704,23 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
goto emapdmars;
}
if (!pdata->slave_only)
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
if (pdata->slave && pdata->slave_num)
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
/* Default transfer size of 32 bytes requires 32-byte alignment */
dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
shdev->shdma_dev.ops = &sh_dmae_shdma_ops;
shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc);
err = shdma_init(&pdev->dev, &shdev->shdma_dev,
pdata->channel_num);
if (err < 0)
goto eshdma;
/* platform data */
shdev->pdata = pdata;
shdev->pdata = pdev->dev.platform_data;
if (pdata->chcr_offset)
shdev->chcr_offset = pdata->chcr_offset;
......@@ -1235,10 +734,10 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, shdev);
shdev->common.dev = &pdev->dev;
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
err = pm_runtime_get_sync(&pdev->dev);
if (err < 0)
dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err);
spin_lock_irq(&sh_dmae_lock);
list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
......@@ -1249,27 +748,6 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
if (err)
goto rst_err;
INIT_LIST_HEAD(&shdev->common.channels);
if (!pdata->slave_only)
dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
if (pdata->slave && pdata->slave_num)
dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
shdev->common.device_alloc_chan_resources
= sh_dmae_alloc_chan_resources;
shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
shdev->common.device_tx_status = sh_dmae_tx_status;
shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
/* Compulsory for DMA_SLAVE fields */
shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
shdev->common.device_control = sh_dmae_control;
/* Default transfer size of 32 bytes requires 32-byte alignment */
shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE;
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
......@@ -1301,7 +779,7 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
!platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
/* Special case - all multiplexed */
for (; irq_cnt < pdata->channel_num; irq_cnt++) {
if (irq_cnt < SH_DMAC_MAX_CHANNELS) {
if (irq_cnt < SH_DMAE_MAX_CHANNELS) {
chan_irq[irq_cnt] = chanirq_res->start;
chan_flag[irq_cnt] = IRQF_SHARED;
} else {
......@@ -1312,7 +790,7 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
} else {
do {
for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
if (irq_cnt >= SH_DMAC_MAX_CHANNELS) {
if (irq_cnt >= SH_DMAE_MAX_CHANNELS) {
irq_cap = 1;
break;
}
......@@ -1328,7 +806,7 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
chan_irq[irq_cnt++] = i;
}
if (irq_cnt >= SH_DMAC_MAX_CHANNELS)
if (irq_cnt >= SH_DMAE_MAX_CHANNELS)
break;
chanirq_res = platform_get_resource(pdev,
......@@ -1346,14 +824,19 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
if (irq_cap)
dev_notice(&pdev->dev, "Attempting to register %d DMA "
"channels when a maximum of %d are supported.\n",
pdata->channel_num, SH_DMAC_MAX_CHANNELS);
pdata->channel_num, SH_DMAE_MAX_CHANNELS);
pm_runtime_put(&pdev->dev);
dma_async_device_register(&shdev->common);
err = dma_async_device_register(&shdev->shdma_dev.dma_dev);
if (err < 0)
goto edmadevreg;
return err;
edmadevreg:
pm_runtime_get(&pdev->dev);
chan_probe_err:
sh_dmae_chan_remove(shdev);
......@@ -1369,10 +852,11 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
platform_set_drvdata(pdev, NULL);
shdma_cleanup(&shdev->shdma_dev);
eshdma:
if (dmars)
iounmap(shdev->dmars);
platform_set_drvdata(pdev, NULL);
emapdmars:
iounmap(shdev->chan_reg);
synchronize_rcu();
......@@ -1387,13 +871,14 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
return err;
}
static int __exit sh_dmae_remove(struct platform_device *pdev)
static int __devexit sh_dmae_remove(struct platform_device *pdev)
{
struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
struct resource *res;
int errirq = platform_get_irq(pdev, 0);
dma_async_device_unregister(&shdev->common);
dma_async_device_unregister(dma_dev);
if (errirq > 0)
free_irq(errirq, shdev);
......@@ -1402,11 +887,11 @@ static int __exit sh_dmae_remove(struct platform_device *pdev)
list_del_rcu(&shdev->node);
spin_unlock_irq(&sh_dmae_lock);
/* channel data remove */
sh_dmae_chan_remove(shdev);
pm_runtime_disable(&pdev->dev);
sh_dmae_chan_remove(shdev);
shdma_cleanup(&shdev->shdma_dev);
if (shdev->dmars)
iounmap(shdev->dmars);
iounmap(shdev->chan_reg);
......@@ -1426,77 +911,14 @@ static int __exit sh_dmae_remove(struct platform_device *pdev)
return 0;
}
static void sh_dmae_shutdown(struct platform_device *pdev)
{
struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
sh_dmae_ctl_stop(shdev);
}
static int sh_dmae_runtime_suspend(struct device *dev)
{
return 0;
}
static int sh_dmae_runtime_resume(struct device *dev)
{
struct sh_dmae_device *shdev = dev_get_drvdata(dev);
return sh_dmae_rst(shdev);
}
#ifdef CONFIG_PM
static int sh_dmae_suspend(struct device *dev)
{
return 0;
}
static int sh_dmae_resume(struct device *dev)
{
struct sh_dmae_device *shdev = dev_get_drvdata(dev);
int i, ret;
ret = sh_dmae_rst(shdev);
if (ret < 0)
dev_err(dev, "Failed to reset!\n");
for (i = 0; i < shdev->pdata->channel_num; i++) {
struct sh_dmae_chan *sh_chan = shdev->chan[i];
struct sh_dmae_slave *param = sh_chan->common.private;
if (!sh_chan->descs_allocated)
continue;
if (param) {
const struct sh_dmae_slave_config *cfg = param->config;
dmae_set_dmars(sh_chan, cfg->mid_rid);
dmae_set_chcr(sh_chan, cfg->chcr);
} else {
dmae_init(sh_chan);
}
}
return 0;
}
#else
#define sh_dmae_suspend NULL
#define sh_dmae_resume NULL
#endif
const struct dev_pm_ops sh_dmae_pm = {
.suspend = sh_dmae_suspend,
.resume = sh_dmae_resume,
.runtime_suspend = sh_dmae_runtime_suspend,
.runtime_resume = sh_dmae_runtime_resume,
};
static struct platform_driver sh_dmae_driver = {
.remove = __exit_p(sh_dmae_remove),
.shutdown = sh_dmae_shutdown,
.driver = {
.owner = THIS_MODULE,
.name = "sh-dma-engine",
.pm = &sh_dmae_pm,
.name = SH_DMAE_DRV_NAME,
},
.remove = __devexit_p(sh_dmae_remove),
.shutdown = sh_dmae_shutdown,
};
static int __init sh_dmae_init(void)
......@@ -1521,4 +943,4 @@ module_exit(sh_dmae_exit);
MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:sh-dma-engine");
MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME);
drivers/dma/sh/shdma.h
View file @ ce3a1ab7
......@@ -13,42 +13,27 @@
#ifndef __DMA_SHDMA_H
#define __DMA_SHDMA_H
#include <linux/shdma-base.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#define SH_DMAC_MAX_CHANNELS 20
#define SH_DMA_SLAVE_NUMBER 256
#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
#define SH_DMAE_MAX_CHANNELS 20
#define SH_DMAE_TCR_MAX 0x00FFFFFF /* 16MB */
struct device;
enum dmae_pm_state {
DMAE_PM_ESTABLISHED,
DMAE_PM_BUSY,
DMAE_PM_PENDING,
};
struct sh_dmae_chan {
spinlock_t desc_lock; /* Descriptor operation lock */
struct list_head ld_queue; /* Link descriptors queue */
struct list_head ld_free; /* Link descriptors free */
struct dma_chan common; /* DMA common channel */
struct device *dev; /* Channel device */
struct tasklet_struct tasklet; /* Tasklet */
int descs_allocated; /* desc count */
struct shdma_chan shdma_chan;
int xmit_shift; /* log_2(bytes_per_xfer) */
int irq;
int id; /* Raw id of this channel */
u32 __iomem *base;
char dev_id[16]; /* unique name per DMAC of channel */
int pm_error;
enum dmae_pm_state pm_state;
};
struct sh_dmae_device {
struct dma_device common;
struct sh_dmae_chan *chan[SH_DMAC_MAX_CHANNELS];
struct shdma_dev shdma_dev;
struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
struct sh_dmae_pdata *pdata;
struct list_head node;
u32 __iomem *chan_reg;
......@@ -57,10 +42,21 @@ struct sh_dmae_device {
u32 chcr_ie_bit;
};
#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
struct sh_dmae_regs {
u32 sar; /* SAR / source address */
u32 dar; /* DAR / destination address */
u32 tcr; /* TCR / transfer count */
};
struct sh_dmae_desc {
struct sh_dmae_regs hw;
struct shdma_desc shdma_desc;
};
#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
#define to_sh_dev(chan) container_of(chan->common.device,\
struct sh_dmae_device, common)
#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
struct sh_dmae_device, shdma_dev.dma_dev)
#endif /* __DMA_SHDMA_H */
include/linux/sh_dma.h
View file @ ce3a1ab7
......@@ -13,34 +13,21 @@
#include <linux/dmaengine.h>
#include <linux/list.h>
#include <linux/shdma-base.h>
#include <linux/types.h>
struct device;
/* Used by slave DMA clients to request DMA to/from a specific peripheral */
struct sh_dmae_slave {
union {
unsigned int slave_id; /* Set by the platform */
struct shdma_slave shdma_slave;
};
struct shdma_slave shdma_slave; /* Set by the platform */
struct device *dma_dev; /* Set by the platform */
const struct sh_dmae_slave_config *config; /* Set by the driver */
};
struct sh_dmae_regs {
u32 sar; /* SAR / source address */
u32 dar; /* DAR / destination address */
u32 tcr; /* TCR / transfer count */
};
struct sh_desc {
struct sh_dmae_regs hw;
struct list_head node;
struct dma_async_tx_descriptor async_tx;
enum dma_transfer_direction direction;
dma_cookie_t cookie;
size_t partial;
int chunks;
int mark;
};
/*
* Supplied by platforms to specify, how a DMA channel has to be configured for
* a certain peripheral
*/
struct sh_dmae_slave_config {
unsigned int slave_id;
dma_addr_t addr;
......
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