@@ -1 +1,3 @@
obj-$(CONFIG_SF_PDMA) += sf-pdma.o
+
+CFLAGS_sf-pdma.o += -O0
@@ -482,9 +482,7 @@ static void sf_pdma_setup_chans(struct sf_pdma *pdma)
static int sf_pdma_probe(struct platform_device *pdev)
{
struct sf_pdma *pdma;
- struct sf_pdma_chan *chan;
struct resource *res;
- int len, chans;
int ret;
const enum dma_slave_buswidth widths =
DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
@@ -492,13 +490,21 @@ static int sf_pdma_probe(struct platform_device *pdev)
DMA_SLAVE_BUSWIDTH_16_BYTES | DMA_SLAVE_BUSWIDTH_32_BYTES |
DMA_SLAVE_BUSWIDTH_64_BYTES;
- chans = PDMA_NR_CH;
- len = sizeof(*pdma) + sizeof(*chan) * chans;
- pdma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
+ pdma = devm_kzalloc(&pdev->dev, sizeof(*pdma), GFP_KERNEL);
if (!pdma)
return -ENOMEM;
- pdma->n_chans = chans;
+ ret = of_property_read_u32(pdev->dev.of_node, "dma-channels",
+ &pdma->n_chans);
+ if (ret) {
+ dev_notice(&pdev->dev, "set number of channels to default value: 4\n");
+ pdma->n_chans = PDMA_MAX_NR_CH;
+ }
+
+ if (pdma->n_chans > PDMA_MAX_NR_CH) {
+ dev_err(&pdev->dev, "the number of channels exceeds the maximum\n");
+ return -EINVAL;
+ }
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pdma->membase = devm_ioremap_resource(&pdev->dev, res);
@@ -556,7 +562,7 @@ static int sf_pdma_remove(struct platform_device *pdev)
struct sf_pdma_chan *ch;
int i;
- for (i = 0; i < PDMA_NR_CH; i++) {
+ for (i = 0; i < pdma->n_chans; i++) {
ch = &pdma->chans[i];
devm_free_irq(&pdev->dev, ch->txirq, ch);
@@ -22,11 +22,7 @@
#include "../dmaengine.h"
#include "../virt-dma.h"
-#define PDMA_NR_CH 4
-
-#if (PDMA_NR_CH != 4)
-#error "Please define PDMA_NR_CH to 4"
-#endif
+#define PDMA_MAX_NR_CH 4
#define PDMA_BASE_ADDR 0x3000000
#define PDMA_CHAN_OFFSET 0x1000
@@ -118,7 +114,7 @@ struct sf_pdma {
void __iomem *membase;
void __iomem *mappedbase;
u32 n_chans;
- struct sf_pdma_chan chans[PDMA_NR_CH];
+ struct sf_pdma_chan chans[PDMA_MAX_NR_CH];
};
#endif /* _SF_PDMA_H */
It currently assumes that there are always four channels, it would cause the error if there is actually less than four channels. Change that by getting number of channel from device tree. For backwards-compatible, it uses the default value (i.e. 4) when there is no 'dma-channels' information in dts. Signed-off-by: Zong Li <zong.li@sifive.com> --- drivers/dma/sf-pdma/Makefile | 2 ++ drivers/dma/sf-pdma/sf-pdma.c | 20 +++++++++++++------- drivers/dma/sf-pdma/sf-pdma.h | 8 ++------ 3 files changed, 17 insertions(+), 13 deletions(-)