Neaten code used as a template for other drivers.
Make the code more consistent with kernel styles.
o Convert #defines with (1<<foo) to BIT(foo)
o Alignment wrapping
o Logic inversions to put return at end of functions
o Convert devm_kzalloc with multiply to devm_kcalloc
o typo of Peripheral fix
Signed-off-by: Joe Perches <j...@perches.com>
---
> At least, the code is directly taken from mmp_pdma.c ;-)
Well, maybe the template code should be updated if there
are going to be more of these.
Uncompiled/untested.
drivers/dma/mmp_pdma.c | 204 +++++++++++++++++++++++++------------------------
1 file changed, 105 insertions(+), 99 deletions(-)
diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index dcb1e05..c2658f6 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -5,6 +5,7 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -32,38 +33,37 @@
#define DTADR 0x0208
#define DCMD 0x020c
-#define DCSR_RUN (1 << 31) /* Run Bit (read / write) */
-#define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch (read / write) */
-#define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable (read / write)
*/
-#define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */
-#define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */
-#define DCSR_ENDINTR (1 << 2) /* End Interrupt (read / write) */
-#define DCSR_STARTINTR (1 << 1) /* Start Interrupt (read / write) */
-#define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt (read / write) */
-
-#define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable
(R/W) */
-#define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */
-#define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */
-#define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */
-#define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */
-#define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */
-#define DCSR_EORINTR (1 << 9) /* The end of Receive */
-
-#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + \
- (((n) & 0x3f) << 2))
-#define DRCMR_MAPVLD (1 << 7) /* Map Valid (read / write) */
-#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read /
write) */
+#define DCSR_RUN BIT(31) /* Run Bit (read / write) */
+#define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
+#define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */
+#define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
+#define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
+#define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
+#define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
+#define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
+
+#define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */
+#define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
+#define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
+#define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
+#define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
+#define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
+#define DCSR_EORINTR BIT(9) /* The end of Receive */
+
+#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2))
+#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
+#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
-#define DDADR_STOP (1 << 0) /* Stop (read / write) */
-
-#define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment
Setting. */
-#define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment
Setting. */
-#define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */
-#define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */
-#define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */
-#define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */
-#define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */
+#define DDADR_STOP BIT(0) /* Stop (read / write) */
+
+#define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
+#define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
+#define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
+#define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
+#define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
+#define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
+#define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
@@ -132,10 +132,14 @@ struct mmp_pdma_device {
spinlock_t phy_lock; /* protect alloc/free phy channels */
};
-#define tx_to_mmp_pdma_desc(tx) container_of(tx, struct mmp_pdma_desc_sw,
async_tx)
-#define to_mmp_pdma_desc(lh) container_of(lh, struct mmp_pdma_desc_sw, node)
-#define to_mmp_pdma_chan(dchan) container_of(dchan, struct mmp_pdma_chan, chan)
-#define to_mmp_pdma_dev(dmadev) container_of(dmadev, struct mmp_pdma_device,
device)
+#define tx_to_mmp_pdma_desc(tx) \
+ container_of(tx, struct mmp_pdma_desc_sw, async_tx)
+#define to_mmp_pdma_desc(lh) \
+ container_of(lh, struct mmp_pdma_desc_sw, node)
+#define to_mmp_pdma_chan(dchan) \
+ container_of(dchan, struct mmp_pdma_chan, chan)
+#define to_mmp_pdma_dev(dmadev) \
+ container_of(dmadev, struct mmp_pdma_device, device)
static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
{
@@ -162,19 +166,18 @@ static void enable_chan(struct mmp_pdma_phy *phy)
writel(dalgn, phy->base + DALGN);
reg = (phy->idx << 2) + DCSR;
- writel(readl(phy->base + reg) | DCSR_RUN,
- phy->base + reg);
+ writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
}
static void disable_chan(struct mmp_pdma_phy *phy)
{
u32 reg;
- if (phy) {
- reg = (phy->idx << 2) + DCSR;
- writel(readl(phy->base + reg) & ~DCSR_RUN,
- phy->base + reg);
- }
+ if (!phy)
+ return;
+
+ reg = (phy->idx << 2) + DCSR;
+ writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
}
static int clear_chan_irq(struct mmp_pdma_phy *phy)
@@ -183,26 +186,27 @@ static int clear_chan_irq(struct mmp_pdma_phy *phy)
u32 dint = readl(phy->base + DINT);
u32 reg = (phy->idx << 2) + DCSR;
- if (dint & BIT(phy->idx)) {
- /* clear irq */
- dcsr = readl(phy->base + reg);
- writel(dcsr, phy->base + reg);
- if ((dcsr & DCSR_BUSERR) && (phy->vchan))
- dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
- return 0;
- }
- return -EAGAIN;
+ if (!(dint & BIT(phy->idx)))
+ return -EAGAIN;
+
+ /* clear irq */
+ dcsr = readl(phy->base + reg);
+ writel(dcsr, phy->base + reg);
+ if ((dcsr & DCSR_BUSERR) && (phy->vchan))
+ dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
+
+ return 0;
}
static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id)
{
struct mmp_pdma_phy *phy = dev_id;
- if (clear_chan_irq(phy) == 0) {
- tasklet_schedule(&phy->vchan->tasklet);
- return IRQ_HANDLED;
- } else
+ if (clear_chan_irq(phy) != 0)
return IRQ_NONE;
+
+ tasklet_schedule(&phy->vchan->tasklet);
+ return IRQ_HANDLED;
}
static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id)
@@ -224,8 +228,8 @@ static irqreturn_t mmp_pdma_int_handler(int irq, void
*dev_id)
if (irq_num)
return IRQ_HANDLED;
- else
- return IRQ_NONE;
+
+ return IRQ_NONE;
}
/* lookup free phy channel as descending priority */
@@ -245,9 +249,9 @@ static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan
*pchan)
*/
spin_lock_irqsave(&pdev->phy_lock, flags);
- for (prio = 0; prio <= (((pdev->dma_channels - 1) & 0xf) >> 2); prio++)
{
+ for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) {
for (i = 0; i < pdev->dma_channels; i++) {
- if (prio != ((i & 0xf) >> 2))
+ if (prio != (i & 0xf) >> 2)
continue;
phy = &pdev->phy[i];
if (!phy->vchan) {
@@ -389,14 +393,16 @@ static int mmp_pdma_alloc_chan_resources(struct dma_chan
*dchan)
if (chan->desc_pool)
return 1;
- chan->desc_pool =
- dma_pool_create(dev_name(&dchan->dev->device), chan->dev,
- sizeof(struct mmp_pdma_desc_sw),
- __alignof__(struct mmp_pdma_desc_sw), 0);
+ chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device),
+ chan->dev,
+ sizeof(struct mmp_pdma_desc_sw),
+ __alignof__(struct mmp_pdma_desc_sw),
+ 0);
if (!chan->desc_pool) {
dev_err(chan->dev, "unable to allocate descriptor pool\n");
return -ENOMEM;
}
+
mmp_pdma_free_phy(chan);
chan->idle = true;
chan->dev_addr = 0;
@@ -404,7 +410,7 @@ static int mmp_pdma_alloc_chan_resources(struct dma_chan
*dchan)
}
static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
- struct list_head *list)
+ struct list_head *list)
{
struct mmp_pdma_desc_sw *desc, *_desc;
@@ -434,8 +440,8 @@ static void mmp_pdma_free_chan_resources(struct dma_chan
*dchan)
static struct dma_async_tx_descriptor *
mmp_pdma_prep_memcpy(struct dma_chan *dchan,
- dma_addr_t dma_dst, dma_addr_t dma_src,
- size_t len, unsigned long flags)
+ dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, unsigned long flags)
{
struct mmp_pdma_chan *chan;
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
@@ -515,8 +521,8 @@ fail:
static struct dma_async_tx_descriptor *
mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_transfer_direction dir,
- unsigned long flags, void *context)
+ unsigned int sg_len, enum dma_transfer_direction dir,
+ unsigned long flags, void *context)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
@@ -591,10 +597,11 @@ fail:
return NULL;
}
-static struct dma_async_tx_descriptor *mmp_pdma_prep_dma_cyclic(
- struct dma_chan *dchan, dma_addr_t buf_addr, size_t len,
- size_t period_len, enum dma_transfer_direction direction,
- unsigned long flags, void *context)
+static struct dma_async_tx_descriptor *
+mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
+ dma_addr_t buf_addr, size_t len, size_t period_len,
+ enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
{
struct mmp_pdma_chan *chan;
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
@@ -636,8 +643,8 @@ static struct dma_async_tx_descriptor
*mmp_pdma_prep_dma_cyclic(
goto fail;
}
- new->desc.dcmd = chan->dcmd | DCMD_ENDIRQEN |
- (DCMD_LENGTH & period_len);
+ new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
+ (DCMD_LENGTH & period_len));
new->desc.dsadr = dma_src;
new->desc.dtadr = dma_dst;
@@ -677,12 +684,11 @@ fail:
}
static int mmp_pdma_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd,
- unsigned long arg)
+ unsigned long arg)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
struct dma_slave_config *cfg = (void *)arg;
unsigned long flags;
- int ret = 0;
u32 maxburst = 0, addr = 0;
enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
@@ -739,11 +745,12 @@ static int mmp_pdma_control(struct dma_chan *dchan, enum
dma_ctrl_cmd cmd,
return -ENOSYS;
}
- return ret;
+ return 0;
}
static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
- dma_cookie_t cookie, struct dma_tx_state *txstate)
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
{
return dma_cookie_status(dchan, cookie, txstate);
}
@@ -845,15 +852,14 @@ static int mmp_pdma_remove(struct platform_device *op)
return 0;
}
-static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev,
- int idx, int irq)
+static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
{
struct mmp_pdma_phy *phy = &pdev->phy[idx];
struct mmp_pdma_chan *chan;
int ret;
- chan = devm_kzalloc(pdev->dev,
- sizeof(struct mmp_pdma_chan), GFP_KERNEL);
+ chan = devm_kzalloc(pdev->dev, sizeof(struct mmp_pdma_chan),
+ GFP_KERNEL);
if (chan == NULL)
return -ENOMEM;
@@ -861,8 +867,8 @@ static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev,
phy->base = pdev->base;
if (irq) {
- ret = devm_request_irq(pdev->dev, irq,
- mmp_pdma_chan_handler, 0, "pdma", phy);
+ ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler, 0,
+ "pdma", phy);
if (ret) {
dev_err(pdev->dev, "channel request irq fail!\n");
return ret;
@@ -877,8 +883,7 @@ static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev,
INIT_LIST_HEAD(&chan->chain_running);
/* register virt channel to dma engine */
- list_add_tail(&chan->chan.device_node,
- &pdev->device.channels);
+ list_add_tail(&chan->chan.device_node, &pdev->device.channels);
return 0;
}
@@ -913,13 +918,12 @@ retry:
* the lookup and the reservation */
chan = dma_get_slave_channel(candidate);
- if (chan) {
- struct mmp_pdma_chan *c = to_mmp_pdma_chan(chan);
- c->drcmr = dma_spec->args[0];
- return chan;
- }
+ if (!chan)
+ goto retry;
- goto retry;
+ to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
+
+ return chan;
}
static int mmp_pdma_probe(struct platform_device *op)
@@ -934,6 +938,7 @@ static int mmp_pdma_probe(struct platform_device *op)
pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
if (!pdev)
return -ENOMEM;
+
pdev->dev = &op->dev;
spin_lock_init(&pdev->phy_lock);
@@ -945,8 +950,8 @@ static int mmp_pdma_probe(struct platform_device *op)
of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
if (of_id)
- of_property_read_u32(pdev->dev->of_node,
- "#dma-channels", &dma_channels);
+ of_property_read_u32(pdev->dev->of_node, "#dma-channels",
+ &dma_channels);
else if (pdata && pdata->dma_channels)
dma_channels = pdata->dma_channels;
else
@@ -958,8 +963,9 @@ static int mmp_pdma_probe(struct platform_device *op)
irq_num++;
}
- pdev->phy = devm_kzalloc(pdev->dev,
- dma_channels * sizeof(struct mmp_pdma_chan), GFP_KERNEL);
+ pdev->phy = devm_kcalloc(pdev->dev,
+ dma_channels, sizeof(struct mmp_pdma_chan),
+ GFP_KERNEL);
if (pdev->phy == NULL)
return -ENOMEM;
@@ -968,8 +974,8 @@ static int mmp_pdma_probe(struct platform_device *op)
if (irq_num != dma_channels) {
/* all chan share one irq, demux inside */
irq = platform_get_irq(op, 0);
- ret = devm_request_irq(pdev->dev, irq,
- mmp_pdma_int_handler, 0, "pdma", pdev);
+ ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler, 0,
+ "pdma", pdev);
if (ret)
return ret;
}
@@ -1044,7 +1050,7 @@ bool mmp_pdma_filter_fn(struct dma_chan *chan, void
*param)
if (chan->device->dev->driver != &mmp_pdma_driver.driver)
return false;
- c->drcmr = *(unsigned int *) param;
+ c->drcmr = *(unsigned int *)param;
return true;
}
@@ -1052,6 +1058,6 @@ EXPORT_SYMBOL_GPL(mmp_pdma_filter_fn);
module_platform_driver(mmp_pdma_driver);
-MODULE_DESCRIPTION("MARVELL MMP Periphera DMA Driver");
+MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_LICENSE("GPL v2");
--
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