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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/dma/hsu/hsu.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/dma/hsu/hsu.c')
-rw-r--r--kernel/drivers/dma/hsu/hsu.c63
1 files changed, 11 insertions, 52 deletions
diff --git a/kernel/drivers/dma/hsu/hsu.c b/kernel/drivers/dma/hsu/hsu.c
index f42f71e37..823ad728a 100644
--- a/kernel/drivers/dma/hsu/hsu.c
+++ b/kernel/drivers/dma/hsu/hsu.c
@@ -99,21 +99,13 @@ static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc)
static void hsu_dma_stop_channel(struct hsu_dma_chan *hsuc)
{
- unsigned long flags;
-
- spin_lock_irqsave(&hsuc->lock, flags);
hsu_chan_disable(hsuc);
hsu_chan_writel(hsuc, HSU_CH_DCR, 0);
- spin_unlock_irqrestore(&hsuc->lock, flags);
}
static void hsu_dma_start_channel(struct hsu_dma_chan *hsuc)
{
- unsigned long flags;
-
- spin_lock_irqsave(&hsuc->lock, flags);
hsu_dma_chan_start(hsuc);
- spin_unlock_irqrestore(&hsuc->lock, flags);
}
static void hsu_dma_start_transfer(struct hsu_dma_chan *hsuc)
@@ -139,9 +131,9 @@ static u32 hsu_dma_chan_get_sr(struct hsu_dma_chan *hsuc)
unsigned long flags;
u32 sr;
- spin_lock_irqsave(&hsuc->lock, flags);
+ spin_lock_irqsave(&hsuc->vchan.lock, flags);
sr = hsu_chan_readl(hsuc, HSU_CH_SR);
- spin_unlock_irqrestore(&hsuc->lock, flags);
+ spin_unlock_irqrestore(&hsuc->vchan.lock, flags);
return sr;
}
@@ -154,7 +146,7 @@ irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr)
u32 sr;
/* Sanity check */
- if (nr >= chip->pdata->nr_channels)
+ if (nr >= chip->hsu->nr_channels)
return IRQ_NONE;
hsuc = &chip->hsu->chan[nr];
@@ -273,14 +265,11 @@ static size_t hsu_dma_active_desc_size(struct hsu_dma_chan *hsuc)
struct hsu_dma_desc *desc = hsuc->desc;
size_t bytes = hsu_dma_desc_size(desc);
int i;
- unsigned long flags;
- spin_lock_irqsave(&hsuc->lock, flags);
i = desc->active % HSU_DMA_CHAN_NR_DESC;
do {
bytes += hsu_chan_readl(hsuc, HSU_CH_DxTSR(i));
} while (--i >= 0);
- spin_unlock_irqrestore(&hsuc->lock, flags);
return bytes;
}
@@ -327,24 +316,6 @@ static int hsu_dma_slave_config(struct dma_chan *chan,
return 0;
}
-static void hsu_dma_chan_deactivate(struct hsu_dma_chan *hsuc)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&hsuc->lock, flags);
- hsu_chan_disable(hsuc);
- spin_unlock_irqrestore(&hsuc->lock, flags);
-}
-
-static void hsu_dma_chan_activate(struct hsu_dma_chan *hsuc)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&hsuc->lock, flags);
- hsu_chan_enable(hsuc);
- spin_unlock_irqrestore(&hsuc->lock, flags);
-}
-
static int hsu_dma_pause(struct dma_chan *chan)
{
struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan);
@@ -352,7 +323,7 @@ static int hsu_dma_pause(struct dma_chan *chan)
spin_lock_irqsave(&hsuc->vchan.lock, flags);
if (hsuc->desc && hsuc->desc->status == DMA_IN_PROGRESS) {
- hsu_dma_chan_deactivate(hsuc);
+ hsu_chan_disable(hsuc);
hsuc->desc->status = DMA_PAUSED;
}
spin_unlock_irqrestore(&hsuc->vchan.lock, flags);
@@ -368,7 +339,7 @@ static int hsu_dma_resume(struct dma_chan *chan)
spin_lock_irqsave(&hsuc->vchan.lock, flags);
if (hsuc->desc && hsuc->desc->status == DMA_PAUSED) {
hsuc->desc->status = DMA_IN_PROGRESS;
- hsu_dma_chan_activate(hsuc);
+ hsu_chan_enable(hsuc);
}
spin_unlock_irqrestore(&hsuc->vchan.lock, flags);
@@ -404,7 +375,6 @@ static void hsu_dma_free_chan_resources(struct dma_chan *chan)
int hsu_dma_probe(struct hsu_dma_chip *chip)
{
struct hsu_dma *hsu;
- struct hsu_dma_platform_data *pdata = chip->pdata;
void __iomem *addr = chip->regs + chip->offset;
unsigned short i;
int ret;
@@ -415,25 +385,16 @@ int hsu_dma_probe(struct hsu_dma_chip *chip)
chip->hsu = hsu;
- if (!pdata) {
- pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
- return -ENOMEM;
-
- chip->pdata = pdata;
+ /* Calculate nr_channels from the IO space length */
+ hsu->nr_channels = (chip->length - chip->offset) / HSU_DMA_CHAN_LENGTH;
- /* Guess nr_channels from the IO space length */
- pdata->nr_channels = (chip->length - chip->offset) /
- HSU_DMA_CHAN_LENGTH;
- }
-
- hsu->chan = devm_kcalloc(chip->dev, pdata->nr_channels,
+ hsu->chan = devm_kcalloc(chip->dev, hsu->nr_channels,
sizeof(*hsu->chan), GFP_KERNEL);
if (!hsu->chan)
return -ENOMEM;
INIT_LIST_HEAD(&hsu->dma.channels);
- for (i = 0; i < pdata->nr_channels; i++) {
+ for (i = 0; i < hsu->nr_channels; i++) {
struct hsu_dma_chan *hsuc = &hsu->chan[i];
hsuc->vchan.desc_free = hsu_dma_desc_free;
@@ -441,8 +402,6 @@ int hsu_dma_probe(struct hsu_dma_chip *chip)
hsuc->direction = (i & 0x1) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
hsuc->reg = addr + i * HSU_DMA_CHAN_LENGTH;
-
- spin_lock_init(&hsuc->lock);
}
dma_cap_set(DMA_SLAVE, hsu->dma.cap_mask);
@@ -471,7 +430,7 @@ int hsu_dma_probe(struct hsu_dma_chip *chip)
if (ret)
return ret;
- dev_info(chip->dev, "Found HSU DMA, %d channels\n", pdata->nr_channels);
+ dev_info(chip->dev, "Found HSU DMA, %d channels\n", hsu->nr_channels);
return 0;
}
EXPORT_SYMBOL_GPL(hsu_dma_probe);
@@ -483,7 +442,7 @@ int hsu_dma_remove(struct hsu_dma_chip *chip)
dma_async_device_unregister(&hsu->dma);
- for (i = 0; i < chip->pdata->nr_channels; i++) {
+ for (i = 0; i < hsu->nr_channels; i++) {
struct hsu_dma_chan *hsuc = &hsu->chan[i];
tasklet_kill(&hsuc->vchan.task);