DMAENGINE: generic slave control v2
Convert the device_terminate_all() operation on the
DMA engine to a generic device_control() operation
which can now optionally support also pausing and
resuming DMA on a certain channel. Implemented for the
COH 901 318 DMAC as an example.
[dan.j.williams@intel.com: update for timberdale]
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Li Yang <leoli@freescale.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Magnus Damm <damm@opensource.se>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/arch/arm/mach-u300/include/mach/coh901318.h b/arch/arm/mach-u300/include/mach/coh901318.h
index b8155b4..43ec040 100644
--- a/arch/arm/mach-u300/include/mach/coh901318.h
+++ b/arch/arm/mach-u300/include/mach/coh901318.h
@@ -110,20 +110,6 @@
u32 coh901318_get_bytes_left(struct dma_chan *chan);
/**
- * coh901318_stop() - Stops dma transfer
- * @chan: dma channel handle
- * return 0 on success otherwise negative value
- */
-void coh901318_stop(struct dma_chan *chan);
-
-/**
- * coh901318_continue() - Resumes a stopped dma transfer
- * @chan: dma channel handle
- * return 0 on success otherwise negative value
- */
-void coh901318_continue(struct dma_chan *chan);
-
-/**
* coh901318_filter_id() - DMA channel filter function
* @chan: dma channel handle
* @chan_id: id of dma channel to be filter out
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index efc1a61..f9143cf 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -759,13 +759,17 @@
return NULL;
}
-static void atc_terminate_all(struct dma_chan *chan)
+static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma *atdma = to_at_dma(chan->device);
struct at_desc *desc, *_desc;
LIST_HEAD(list);
+ /* Only supports DMA_TERMINATE_ALL */
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
/*
* This is only called when something went wrong elsewhere, so
* we don't really care about the data. Just disable the
@@ -789,6 +793,8 @@
/* Flush all pending and queued descriptors */
list_for_each_entry_safe(desc, _desc, &list, desc_node)
atc_chain_complete(atchan, desc);
+
+ return 0;
}
/**
@@ -1091,7 +1097,7 @@
if (dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask)) {
atdma->dma_common.device_prep_slave_sg = atc_prep_slave_sg;
- atdma->dma_common.device_terminate_all = atc_terminate_all;
+ atdma->dma_common.device_control = atc_control;
}
dma_writel(atdma, EN, AT_DMA_ENABLE);
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index f636c4a..53c54e0 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -506,10 +506,11 @@
EXPORT_SYMBOL(coh901318_get_bytes_left);
-/* Stops a transfer without losing data. Enables power save.
- Use this function in conjunction with coh901318_continue(..)
-*/
-void coh901318_stop(struct dma_chan *chan)
+/*
+ * Pauses a transfer without losing data. Enables power save.
+ * Use this function in conjunction with coh901318_resume.
+ */
+static void coh901318_pause(struct dma_chan *chan)
{
u32 val;
unsigned long flags;
@@ -550,12 +551,11 @@
spin_unlock_irqrestore(&cohc->lock, flags);
}
-EXPORT_SYMBOL(coh901318_stop);
-/* Continues a transfer that has been stopped via 300_dma_stop(..).
+/* Resumes a transfer that has been stopped via 300_dma_stop(..).
Power save is handled.
*/
-void coh901318_continue(struct dma_chan *chan)
+static void coh901318_resume(struct dma_chan *chan)
{
u32 val;
unsigned long flags;
@@ -581,7 +581,6 @@
spin_unlock_irqrestore(&cohc->lock, flags);
}
-EXPORT_SYMBOL(coh901318_continue);
bool coh901318_filter_id(struct dma_chan *chan, void *chan_id)
{
@@ -945,7 +944,7 @@
spin_unlock_irqrestore(&cohc->lock, flags);
- chan->device->device_terminate_all(chan);
+ chan->device->device_control(chan, DMA_TERMINATE_ALL);
}
@@ -1179,16 +1178,29 @@
spin_unlock_irqrestore(&cohc->lock, flags);
}
-static void
-coh901318_terminate_all(struct dma_chan *chan)
+static int
+coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
unsigned long flags;
struct coh901318_chan *cohc = to_coh901318_chan(chan);
struct coh901318_desc *cohd;
void __iomem *virtbase = cohc->base->virtbase;
- coh901318_stop(chan);
+ if (cmd == DMA_PAUSE) {
+ coh901318_pause(chan);
+ return 0;
+ }
+ if (cmd == DMA_RESUME) {
+ coh901318_resume(chan);
+ return 0;
+ }
+
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
+ /* The remainder of this function terminates the transfer */
+ coh901318_pause(chan);
spin_lock_irqsave(&cohc->lock, flags);
/* Clear any pending BE or TC interrupt */
@@ -1227,6 +1239,8 @@
cohc->busy = 0;
spin_unlock_irqrestore(&cohc->lock, flags);
+
+ return 0;
}
void coh901318_base_init(struct dma_device *dma, const int *pick_chans,
struct coh901318_base *base)
@@ -1344,7 +1358,7 @@
base->dma_slave.device_prep_slave_sg = coh901318_prep_slave_sg;
base->dma_slave.device_is_tx_complete = coh901318_is_tx_complete;
base->dma_slave.device_issue_pending = coh901318_issue_pending;
- base->dma_slave.device_terminate_all = coh901318_terminate_all;
+ base->dma_slave.device_control = coh901318_control;
base->dma_slave.dev = &pdev->dev;
err = dma_async_device_register(&base->dma_slave);
@@ -1364,7 +1378,7 @@
base->dma_memcpy.device_prep_dma_memcpy = coh901318_prep_memcpy;
base->dma_memcpy.device_is_tx_complete = coh901318_is_tx_complete;
base->dma_memcpy.device_issue_pending = coh901318_issue_pending;
- base->dma_memcpy.device_terminate_all = coh901318_terminate_all;
+ base->dma_memcpy.device_control = coh901318_control;
base->dma_memcpy.dev = &pdev->dev;
/*
* This controller can only access address at even 32bit boundaries,
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 87399ca..ffc4ee9c 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -694,7 +694,7 @@
BUG_ON(dma_has_cap(DMA_SLAVE, device->cap_mask) &&
!device->device_prep_slave_sg);
BUG_ON(dma_has_cap(DMA_SLAVE, device->cap_mask) &&
- !device->device_terminate_all);
+ !device->device_control);
BUG_ON(!device->device_alloc_chan_resources);
BUG_ON(!device->device_free_chan_resources);
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index d28369f..8a6b85f 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -781,13 +781,17 @@
return NULL;
}
-static void dwc_terminate_all(struct dma_chan *chan)
+static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dw_dma *dw = to_dw_dma(chan->device);
struct dw_desc *desc, *_desc;
LIST_HEAD(list);
+ /* Only supports DMA_TERMINATE_ALL */
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
/*
* This is only called when something went wrong elsewhere, so
* we don't really care about the data. Just disable the
@@ -810,6 +814,8 @@
/* Flush all pending and queued descriptors */
list_for_each_entry_safe(desc, _desc, &list, desc_node)
dwc_descriptor_complete(dwc, desc);
+
+ return 0;
}
static enum dma_status
@@ -1338,7 +1344,7 @@
dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy;
dw->dma.device_prep_slave_sg = dwc_prep_slave_sg;
- dw->dma.device_terminate_all = dwc_terminate_all;
+ dw->dma.device_control = dwc_control;
dw->dma.device_is_tx_complete = dwc_is_tx_complete;
dw->dma.device_issue_pending = dwc_issue_pending;
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index bbb4be5..714fc46 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -774,13 +774,18 @@
return NULL;
}
-static void fsl_dma_device_terminate_all(struct dma_chan *dchan)
+static int fsl_dma_device_control(struct dma_chan *dchan,
+ enum dma_ctrl_cmd cmd)
{
struct fsldma_chan *chan;
unsigned long flags;
+ /* Only supports DMA_TERMINATE_ALL */
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
if (!dchan)
- return;
+ return -EINVAL;
chan = to_fsl_chan(dchan);
@@ -794,6 +799,8 @@
fsldma_free_desc_list(chan, &chan->ld_running);
spin_unlock_irqrestore(&chan->desc_lock, flags);
+
+ return 0;
}
/**
@@ -1332,7 +1339,7 @@
fdev->common.device_is_tx_complete = fsl_dma_is_complete;
fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending;
fdev->common.device_prep_slave_sg = fsl_dma_prep_slave_sg;
- fdev->common.device_terminate_all = fsl_dma_device_terminate_all;
+ fdev->common.device_control = fsl_dma_device_control;
fdev->common.dev = &op->dev;
dev_set_drvdata(&op->dev, fdev);
diff --git a/drivers/dma/ipu/ipu_idmac.c b/drivers/dma/ipu/ipu_idmac.c
index 2a44639..39e7fb2 100644
--- a/drivers/dma/ipu/ipu_idmac.c
+++ b/drivers/dma/ipu/ipu_idmac.c
@@ -1472,13 +1472,17 @@
*/
}
-static void __idmac_terminate_all(struct dma_chan *chan)
+static int __idmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct idmac_channel *ichan = to_idmac_chan(chan);
struct idmac *idmac = to_idmac(chan->device);
unsigned long flags;
int i;
+ /* Only supports DMA_TERMINATE_ALL */
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
ipu_disable_channel(idmac, ichan,
ichan->status >= IPU_CHANNEL_ENABLED);
@@ -1505,17 +1509,22 @@
tasklet_enable(&to_ipu(idmac)->tasklet);
ichan->status = IPU_CHANNEL_INITIALIZED;
+
+ return 0;
}
-static void idmac_terminate_all(struct dma_chan *chan)
+static int idmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct idmac_channel *ichan = to_idmac_chan(chan);
+ int ret;
mutex_lock(&ichan->chan_mutex);
- __idmac_terminate_all(chan);
+ ret = __idmac_control(chan, cmd);
mutex_unlock(&ichan->chan_mutex);
+
+ return ret;
}
#ifdef DEBUG
@@ -1607,7 +1616,7 @@
mutex_lock(&ichan->chan_mutex);
- __idmac_terminate_all(chan);
+ __idmac_control(chan, DMA_TERMINATE_ALL);
if (ichan->status > IPU_CHANNEL_FREE) {
#ifdef DEBUG
@@ -1669,7 +1678,7 @@
/* Compulsory for DMA_SLAVE fields */
dma->device_prep_slave_sg = idmac_prep_slave_sg;
- dma->device_terminate_all = idmac_terminate_all;
+ dma->device_control = idmac_control;
INIT_LIST_HEAD(&dma->channels);
for (i = 0; i < IPU_CHANNELS_NUM; i++) {
@@ -1703,7 +1712,7 @@
for (i = 0; i < IPU_CHANNELS_NUM; i++) {
struct idmac_channel *ichan = ipu->channel + i;
- idmac_terminate_all(&ichan->dma_chan);
+ idmac_control(&ichan->dma_chan, DMA_TERMINATE_ALL);
idmac_prep_slave_sg(&ichan->dma_chan, NULL, 0, DMA_NONE, 0);
}
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index 5d17e09..ce28c1e 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -580,12 +580,16 @@
direction, flags);
}
-static void sh_dmae_terminate_all(struct dma_chan *chan)
+static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
+ /* Only supports DMA_TERMINATE_ALL */
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
if (!chan)
- return;
+ return -EINVAL;
dmae_halt(sh_chan);
@@ -601,6 +605,8 @@
spin_unlock_bh(&sh_chan->desc_lock);
sh_dmae_chan_ld_cleanup(sh_chan, true);
+
+ return 0;
}
static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
@@ -1029,7 +1035,7 @@
/* Compulsory for DMA_SLAVE fields */
shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
- shdev->common.device_terminate_all = sh_dmae_terminate_all;
+ shdev->common.device_control = sh_dmae_control;
shdev->common.dev = &pdev->dev;
/* Default transfer size of 32 bytes requires 32-byte alignment */
diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c
index 145f1c2..7c06471 100644
--- a/drivers/dma/timb_dma.c
+++ b/drivers/dma/timb_dma.c
@@ -613,7 +613,7 @@
return &td_desc->txd;
}
-static void td_terminate_all(struct dma_chan *chan)
+static int td_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct timb_dma_chan *td_chan =
container_of(chan, struct timb_dma_chan, chan);
@@ -621,6 +621,9 @@
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
/* first the easy part, put the queue into the free list */
spin_lock_bh(&td_chan->lock);
list_for_each_entry_safe(td_desc, _td_desc, &td_chan->queue,
@@ -630,6 +633,8 @@
/* now tear down the runnning */
__td_finish(td_chan);
spin_unlock_bh(&td_chan->lock);
+
+ return 0;
}
static void td_tasklet(unsigned long data)
@@ -743,7 +748,7 @@
dma_cap_set(DMA_SLAVE, td->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, td->dma.cap_mask);
td->dma.device_prep_slave_sg = td_prep_slave_sg;
- td->dma.device_terminate_all = td_terminate_all;
+ td->dma.device_control = td_control;
td->dma.dev = &pdev->dev;
diff --git a/drivers/dma/txx9dmac.c b/drivers/dma/txx9dmac.c
index 3ebc610..e528e15 100644
--- a/drivers/dma/txx9dmac.c
+++ b/drivers/dma/txx9dmac.c
@@ -938,12 +938,16 @@
return &first->txd;
}
-static void txx9dmac_terminate_all(struct dma_chan *chan)
+static int txx9dmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
struct txx9dmac_desc *desc, *_desc;
LIST_HEAD(list);
+ /* Only supports DMA_TERMINATE_ALL */
+ if (cmd != DMA_TERMINATE_ALL)
+ return -EINVAL;
+
dev_vdbg(chan2dev(chan), "terminate_all\n");
spin_lock_bh(&dc->lock);
@@ -958,6 +962,8 @@
/* Flush all pending and queued descriptors */
list_for_each_entry_safe(desc, _desc, &list, desc_node)
txx9dmac_descriptor_complete(dc, desc);
+
+ return 0;
}
static enum dma_status
@@ -1153,7 +1159,7 @@
dc->dma.dev = &pdev->dev;
dc->dma.device_alloc_chan_resources = txx9dmac_alloc_chan_resources;
dc->dma.device_free_chan_resources = txx9dmac_free_chan_resources;
- dc->dma.device_terminate_all = txx9dmac_terminate_all;
+ dc->dma.device_control = txx9dmac_control;
dc->dma.device_is_tx_complete = txx9dmac_is_tx_complete;
dc->dma.device_issue_pending = txx9dmac_issue_pending;
if (pdata && pdata->memcpy_chan == ch) {
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 8072128..ae6d24b 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -578,7 +578,7 @@
struct dma_chan *chan = host->data_chan;
if (chan) {
- chan->device->device_terminate_all(chan);
+ chan->device->device_control(chan, DMA_TERMINATE_ALL);
atmci_dma_cleanup(host);
} else {
/* Data transfer was stopped by the interrupt handler */
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index f7b9aff..6909882 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -1087,7 +1087,7 @@
unsigned long flags;
int count;
- chan->device->device_terminate_all(chan);
+ chan->device->device_control(chan, DMA_TERMINATE_ALL);
dev_dbg(port->dev, "Read %u bytes with cookie %d\n",
sh_desc->partial, sh_desc->cookie);
diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
index 772ba3f..3aa50bc 100644
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c
@@ -387,7 +387,8 @@
spin_unlock_irqrestore(&mx3fb->lock, flags);
- mx3_fbi->txd->chan->device->device_terminate_all(mx3_fbi->txd->chan);
+ mx3_fbi->txd->chan->device->device_control(mx3_fbi->txd->chan,
+ DMA_TERMINATE_ALL);
mx3_fbi->txd = NULL;
mx3_fbi->cookie = -EINVAL;
}
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 20ea12c..0731802 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -107,6 +107,19 @@
};
/**
+ * enum dma_ctrl_cmd - DMA operations that can optionally be exercised
+ * on a running channel.
+ * @DMA_TERMINATE_ALL: terminate all ongoing transfers
+ * @DMA_PAUSE: pause ongoing transfers
+ * @DMA_RESUME: resume paused transfer
+ */
+enum dma_ctrl_cmd {
+ DMA_TERMINATE_ALL,
+ DMA_PAUSE,
+ DMA_RESUME,
+};
+
+/**
* enum sum_check_bits - bit position of pq_check_flags
*/
enum sum_check_bits {
@@ -261,7 +274,8 @@
* @device_prep_dma_memset: prepares a memset operation
* @device_prep_dma_interrupt: prepares an end of chain interrupt operation
* @device_prep_slave_sg: prepares a slave dma operation
- * @device_terminate_all: terminate all pending operations
+ * @device_control: manipulate all pending operations on a channel, returns
+ * zero or error code
* @device_is_tx_complete: poll for transaction completion
* @device_issue_pending: push pending transactions to hardware
*/
@@ -313,7 +327,7 @@
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_data_direction direction,
unsigned long flags);
- void (*device_terminate_all)(struct dma_chan *chan);
+ int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd);
enum dma_status (*device_is_tx_complete)(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last,
diff --git a/sound/soc/txx9/txx9aclc.c b/sound/soc/txx9/txx9aclc.c
index efed64b..b35d007 100644
--- a/sound/soc/txx9/txx9aclc.c
+++ b/sound/soc/txx9/txx9aclc.c
@@ -159,7 +159,7 @@
void __iomem *base = drvdata->base;
spin_unlock_irqrestore(&dmadata->dma_lock, flags);
- chan->device->device_terminate_all(chan);
+ chan->device->device_control(chan, DMA_TERMINATE_ALL);
/* first time */
for (i = 0; i < NR_DMA_CHAIN; i++) {
desc = txx9aclc_dma_submit(dmadata,
@@ -267,7 +267,7 @@
struct dma_chan *chan = dmadata->dma_chan;
dmadata->frag_count = -1;
- chan->device->device_terminate_all(chan);
+ chan->device->device_control(chan, DMA_TERMINATE_ALL);
return 0;
}
@@ -396,7 +396,7 @@
struct dma_chan *chan = dmadata->dma_chan;
if (chan) {
dmadata->frag_count = -1;
- chan->device->device_terminate_all(chan);
+ chan->device->device_control(chan, DMA_TERMINATE_ALL);
dma_release_channel(chan);
}
dev->dmadata[i].dma_chan = NULL;