The simple DMA library has originally been extracted from the shdma driver,
which now can be converted to actually use it.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
---
v2: update IRQ handling to match v2 of the simple DMA library
drivers/dma/Kconfig | 1 +
drivers/dma/shdma.c | 1138 ++++++++++++------------------------------------
drivers/dma/shdma.h | 45 +-
include/linux/sh_dma.h | 39 +--
4 files changed, 308 insertions(+), 915 deletions(-)
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index f7c583e..2696552 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -157,6 +157,7 @@ config SH_DMAE
depends on (SUPERH && SH_DMA) || (ARM && ARCH_SHMOBILE)
depends on !SH_DMA_API
select DMA_ENGINE
+ select DMA_SIMPLE
help
Enable support for the Renesas SuperH DMA controllers.
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index 812fd76..08011e8 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -3,6 +3,7 @@
*
* base is drivers/dma/flsdma.c
*
+ * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
* Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>
* Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
@@ -32,18 +33,12 @@
#include <linux/rculist.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,
@@ -52,18 +47,12 @@ 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->simple_chan.id].chclr_offset);
}
static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
@@ -153,11 +142,11 @@ 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->simple_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->simple_dev.dma_dev.dev,
"DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
dmaor, shdev->pdata->dmaor_init);
return 0;
@@ -222,15 +211,6 @@ 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)
{
/*
@@ -259,7 +239,7 @@ 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->simple_chan.id];
u16 __iomem *addr = shdev->dmars;
unsigned int shift = chan_pdata->dmars_bit;
@@ -280,720 +260,142 @@ 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 dma_simple_chan *schan,
+ struct dma_simple_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 = sh_chan->common.cookie;
- cookie++;
- if (cookie < 0)
- cookie = 1;
-
- sh_chan->common.cookie = cookie;
- tx->cookie = cookie;
-
- /* 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);
-
- pm_runtime_barrier(sh_chan->dev);
-
- spin_lock_irq(&sh_chan->desc_lock);
-
- /* 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) {
- 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);
- }
-
- 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;
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ simple_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, simple_desc);
+ dev_dbg(sh_chan->simple_chan.dev, "Queue #%d to %d: %u@%x -> %x\n",
+ sdesc->async_tx.cookie, sh_chan->simple_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);
}
-/* Called with desc_lock held */
-static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
+static bool sh_dmae_channel_busy(struct dma_simple_chan *schan)
{
- 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;
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ simple_chan);
+ return dmae_is_busy(sh_chan);
}
-static const struct sh_dmae_slave_config *sh_dmae_find_slave(
- struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param)
+static void sh_dmae_setup_xfer(struct dma_simple_chan *schan,
+ struct dma_simple_slave *sslave)
{
- struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
- struct sh_dmae_pdata *pdata = shdev->pdata;
- int i;
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ simple_chan);
- 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;
-}
+ if (sslave) {
+ struct sh_dmae_slave *slave = container_of(sslave,
+ struct sh_dmae_slave, simple_slave);
+ const struct sh_dmae_slave_config *cfg =
+ slave->config;
-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;
+ dmae_set_dmars(sh_chan, cfg->mid_rid);
+ dmae_set_chcr(sh_chan, cfg->chcr);
} else {
- /* Other desc - invisible to the user */
- new->async_tx.cookie = -EINVAL;
+ dmae_init(sh_chan);
}
-
- 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)
+static const struct sh_dmae_slave_config *dmae_find_slave(
+ struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *slave)
{
- struct scatterlist *sg;
- struct sh_desc *first = NULL, *new = NULL /* compiler... */;
- LIST_HEAD(tx_list);
- int chunks = 0;
- unsigned long irq_flags;
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ struct sh_dmae_pdata *pdata = shdev->pdata;
+ const struct sh_dmae_slave_config *cfg;
int i;
- if (!sg_len)
+ if (slave->simple_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->simple_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)
-{
- 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)
+static int sh_dmae_set_slave(struct dma_simple_chan *schan,
+ struct dma_simple_slave *sslave)
{
- 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,
+ simple_chan);
+ struct sh_dmae_slave *slave = container_of(sslave, struct sh_dmae_slave,
+ simple_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->completed_cookie != desc->cookie - 1)
- dev_dbg(sh_chan->dev,
- "Completing cookie %d, expected %d\n",
- desc->cookie,
- sh_chan->completed_cookie + 1);
- sh_chan->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->completed_cookie = sh_chan->common.cookie;
-
- spin_unlock_irqrestore(&sh_chan->desc_lock, flags);
-
- if (callback)
- callback(param);
+ struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
+ u32 chcr = chcr_read(sh_chan);
- return callback;
+ chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
+ chcr_write(sh_chan, chcr);
}
-/*
- * 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)
+static int sh_dmae_desc_setup(struct dma_simple_chan *schan,
+ struct dma_simple_desc *sdesc,
+ dma_addr_t src, dma_addr_t dst, size_t *len)
{
- while (__ld_cleanup(sh_chan, all))
- ;
-}
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, simple_desc);
-/* Called under spin_lock_irq(&sh_chan->desc_lock) */
-static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
-{
- struct sh_desc *desc;
+ if (*len > schan->max_xfer_len)
+ *len = schan->max_xfer_len;
- /* 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;
- }
-}
+ sh_desc->hw.sar = src;
+ sh_desc->hw.dar = dst;
+ sh_desc->hw.tcr = *len;
-static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
-{
- struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
-
- 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 dma_simple_chan *schan)
{
- struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
- dma_cookie_t last_used;
- dma_cookie_t last_complete;
- enum dma_status status;
- unsigned long flags;
-
- sh_dmae_chan_ld_cleanup(sh_chan, false);
-
- /* First read completed cookie to avoid a skew */
- last_complete = sh_chan->completed_cookie;
- rmb();
- last_used = chan->cookie;
- BUG_ON(last_complete < 0);
- dma_set_tx_state(txstate, last_complete, last_used, 0);
-
- spin_lock_irqsave(&sh_chan->desc_lock, flags);
-
- status = dma_async_is_complete(cookie, last_complete, last_used);
-
- /*
- * 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,
+ simple_chan);
+ dmae_halt(sh_chan);
}
-static irqreturn_t sh_dmae_interrupt(int irq, void *data)
+static bool sh_dmae_chan_irq(struct dma_simple_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,
+ simple_chan);
- chcr = chcr_read(sh_chan);
-
- if (chcr & CHCR_TE) {
- /* DMA stop */
- dmae_halt(sh_chan);
-
- ret = IRQ_HANDLED;
- tasklet_schedule(&sh_chan->tasklet);
- }
+ if (!(chcr_read(sh_chan) & CHCR_TE))
+ return false;
- spin_unlock(&sh_chan->desc_lock);
+ /* DMA stop */
+ dmae_halt(sh_chan);
- 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 = dma_simple_reset(&shdev->simple_dev);
sh_dmae_rst(shdev);
- return !!handled;
+ return ret;
}
static irqreturn_t sh_dmae_err(int irq, void *data)
@@ -1003,35 +405,24 @@ 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 dma_simple_chan *schan,
+ struct dma_simple_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, simple_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, simple_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)
@@ -1085,96 +476,174 @@ 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 dma_simple_dev *sdev = &shdev->simple_dev;
+ struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);
+ struct sh_dmae_chan *sh_chan;
+ struct dma_simple_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;
+ schan = &sh_chan->simple_chan;
+ schan->max_xfer_len = SH_DMA_TCR_MAX + 1;
- /* reference struct dma_device */
- new_sh_chan->common.device = &shdev->common;
+ dma_simple_chan_probe(sdev, schan, id);
- 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);
-
- /* Init descripter manage list */
- INIT_LIST_HEAD(&new_sh_chan->ld_queue);
- INIT_LIST_HEAD(&new_sh_chan->ld_free);
-
- /* 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 = dma_simple_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);
+ dma_simple_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->simple_dev.dma_dev;
+ struct dma_simple_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];
+ dma_simple_for_each_chan(schan, &shdev->simple_dev, i) {
+ struct sh_dmae_chan *sh_chan = container_of(schan,
+ struct sh_dmae_chan, simple_chan);
+ BUG_ON(!schan);
- free_irq(sh_chan->irq, sh_chan);
+ dma_simple_free_irq(&sh_chan->simple_chan);
- list_del(&sh_chan->common.device_node);
- kfree(sh_chan);
- shdev->chan[i] = NULL;
+ dma_simple_chan_remove(schan);
+ kfree(sh_chan);
+ }
+ 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->simple_chan.dma_chan.private;
+
+ if (!sh_chan->simple_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
+
+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 dma_simple_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 dma_simple_desc *sh_dmae_embedded_desc(void *buf, int i)
+{
+ return &((struct sh_dmae_desc *)buf)[i].simple_desc;
}
-static int __init sh_dmae_probe(struct platform_device *pdev)
+static const struct dma_simple_ops sh_dmae_simple_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 */
@@ -1222,6 +691,8 @@ static int __init sh_dmae_probe(struct platform_device *pdev)
goto ealloc;
}
+ dma_dev = &shdev->simple_dev.dma_dev;
+
shdev->chan_reg = ioremap(chan->start, resource_size(chan));
if (!shdev->chan_reg)
goto emapchan;
@@ -1231,8 +702,23 @@ 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->simple_dev.ops = &sh_dmae_simple_ops;
+ shdev->simple_dev.desc_size = sizeof(struct sh_dmae_desc);
+ err = dma_simple_init(&pdev->dev, &shdev->simple_dev,
+ pdata->channel_num);
+ if (err < 0)
+ goto esimple;
+
/* platform data */
- shdev->pdata = pdata;
+ shdev->pdata = pdev->dev.platform_data;
if (pdata->chcr_offset)
shdev->chcr_offset = pdata->chcr_offset;
@@ -1246,10 +732,10 @@ 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);
@@ -1260,27 +746,6 @@ 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);
@@ -1312,7 +777,7 @@ 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 {
@@ -1323,7 +788,7 @@ 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;
}
@@ -1339,7 +804,7 @@ 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,
@@ -1357,14 +822,19 @@ 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->simple_dev.dma_dev);
+ if (err < 0)
+ goto edmadevreg;
return err;
+edmadevreg:
+ pm_runtime_get(&pdev->dev);
+
chan_probe_err:
sh_dmae_chan_remove(shdev);
@@ -1380,10 +850,11 @@ rst_err:
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ platform_set_drvdata(pdev, NULL);
+ dma_simple_cleanup(&shdev->simple_dev);
+esimple:
if (dmars)
iounmap(shdev->dmars);
-
- platform_set_drvdata(pdev, NULL);
emapdmars:
iounmap(shdev->chan_reg);
synchronize_rcu();
@@ -1398,13 +869,14 @@ ermrdmars:
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->simple_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);
@@ -1413,11 +885,11 @@ 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);
+ dma_simple_cleanup(&shdev->simple_dev);
+
if (shdev->dmars)
iounmap(shdev->dmars);
iounmap(shdev->chan_reg);
@@ -1437,77 +909,14 @@ 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 = {
+ .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)
@@ -1531,5 +940,6 @@ module_exit(sh_dmae_exit);
MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@xxxxxxxxxxx>");
MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:sh-dma-engine");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0.1.0");
+MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME);
diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h
index 2b55a27..8bffc19 100644
--- a/drivers/dma/shdma.h
+++ b/drivers/dma/shdma.h
@@ -13,43 +13,27 @@
#ifndef __DMA_SHDMA_H
#define __DMA_SHDMA_H
+#include <linux/dma-simple.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 {
- dma_cookie_t completed_cookie; /* The maximum cookie completed */
- 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 dma_simple_chan simple_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 dma_simple_dev simple_dev;
+ struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
struct sh_dmae_pdata *pdata;
struct list_head node;
u32 __iomem *chan_reg;
@@ -58,10 +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 dma_simple_desc simple_desc;
+};
+
+#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, simple_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->simple_chan.dma_chan.device,\
+ struct sh_dmae_device, simple_dev.dma_dev)
#endif /* __DMA_SHDMA_H */
diff --git a/include/linux/sh_dma.h b/include/linux/sh_dma.h
index ed2aa1e..4f22466 100644
--- a/include/linux/sh_dma.h
+++ b/include/linux/sh_dma.h
@@ -13,34 +13,14 @@
#include <linux/dma-simple.h>
#include <linux/dmaengine.h>
#include <linux/list.h>
+#include <linux/types.h>
-/* 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 dma_simple_slave simple_slave;
- };
- 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;
-};
+struct device;
+/*
+ * 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;
@@ -48,6 +28,13 @@ struct sh_dmae_slave_config {
char mid_rid;
};
+/* Used by slave DMA clients to request DMA to/from a specific peripheral */
+struct sh_dmae_slave {
+ struct dma_simple_slave simple_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_channel {
unsigned int offset;
unsigned int dmars;
--
1.7.2.5
--
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