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dmaengine: dw: define DW_DMA_MAX_NR_MASTERS

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Instead of using magic number in the code the patch provides
DW_DMA_MAX_NR_MASTERS constant.

While here, restrict the reading of data width array by amount of the actual
number of AHB masters.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2015-01-13 19:08:14 +02:00 committed by Vinod Koul
parent cfd8fef322
commit d8ded50f8b
8 changed files with 13 additions and 10 deletions
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2
Documentation/devicetree/bindings/dma/snps-dma.txt
View File

@ -38,7 +38,7 @@ Example:
chan_allocation_order = <1>;
chan_priority = <1>;
block_size = <0xfff>;
data_width = <3 3 0 0>;
data_width = <3 3>;
};
DMA clients connected to the Designware DMA controller must use the format

2
arch/arc/boot/dts/abilis_tb10x.dtsi
View File

@ -112,7 +112,7 @@
chan_allocation_order = <0>;
chan_priority = <1>;
block_size = <0x7ff>;
data_width = <2 0 0 0>;
data_width = <2>;
clocks = <&ahb_clk>;
clock-names = "hclk";
};

4
arch/arm/boot/dts/spear13xx.dtsi
View File

@ -117,7 +117,7 @@
chan_priority = <1>;
block_size = <0xfff>;
dma-masters = <2>;
data_width = <3 3 0 0>;
data_width = <3 3>;
};
dma@eb000000 {
@ -133,7 +133,7 @@
chan_allocation_order = <1>;
chan_priority = <1>;
block_size = <0xfff>;
data_width = <3 3 0 0>;
data_width = <3 3>;
};
fsmc: flash@b0000000 {

2
arch/avr32/mach-at32ap/at32ap700x.c
View File

@ -607,7 +607,7 @@ static struct dw_dma_platform_data dw_dmac0_data = {
.nr_channels = 3,
.block_size = 4095U,
.nr_masters = 2,
.data_width = { 2, 2, 0, 0 },
.data_width = { 2, 2 },
};
static struct resource dw_dmac0_resource[] = {

3
drivers/dma/dw/core.c
View File

@ -1562,7 +1562,8 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
}
} else {
dw->nr_masters = pdata->nr_masters;
memcpy(dw->data_width, pdata->data_width, 4);
for (i = 0; i < dw->nr_masters; i++)
dw->data_width[i] = pdata->data_width[i];
}
/* Calculate all channel mask before DMA setup */

4
drivers/dma/dw/platform.c
View File

@ -99,7 +99,7 @@ dw_dma_parse_dt(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct dw_dma_platform_data *pdata;
u32 tmp, arr[4];
u32 tmp, arr[DW_DMA_MAX_NR_MASTERS];
if (!np) {
dev_err(&pdev->dev, "Missing DT data\n");
@ -126,7 +126,7 @@ dw_dma_parse_dt(struct platform_device *pdev)
pdata->block_size = tmp;
if (!of_property_read_u32(np, "dma-masters", &tmp)) {
if (tmp > 4)
if (tmp > DW_DMA_MAX_NR_MASTERS)
return NULL;
pdata->nr_masters = tmp;

2
drivers/dma/dw/regs.h
View File

@ -285,7 +285,7 @@ struct dw_dma {
/* hardware configuration */
unsigned char nr_masters;
unsigned char data_width[4];
unsigned char data_width[DW_DMA_MAX_NR_MASTERS];
};
static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)

4
include/linux/platform_data/dma-dw.h
View File

@ -13,6 +13,8 @@
#include <linux/device.h>
#define DW_DMA_MAX_NR_MASTERS 4
/**
* struct dw_dma_slave - Controller-specific information about a slave
*
@ -53,7 +55,7 @@ struct dw_dma_platform_data {
unsigned char chan_priority;
unsigned short block_size;
unsigned char nr_masters;
unsigned char data_width[4];
unsigned char data_width[DW_DMA_MAX_NR_MASTERS];
};
#endif /* _PLATFORM_DATA_DMA_DW_H */