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dw_dmac: adjust slave_id accordingly to request line base

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On some hardware configurations we have got the request line with the offset.
The patch introduces convert_slave_id() helper for that cases. The request line
base is came from the driver data provided by the platform_device_id table.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2013-02-20 13:52:17 +02:00 committed by Vinod Koul
parent f73bb9b355
commit bce95c63ef
2 changed files with 17 additions and 1 deletions
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17
drivers/dma/dw_dmac.c
View file

@ -1001,6 +1001,13 @@ static inline void convert_burst(u32 *maxburst)
*maxburst = 0;
}
static inline void convert_slave_id(struct dw_dma_chan *dwc)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
dwc->dma_sconfig.slave_id -= dw->request_line_base;
}
static int
set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
{
@ -1015,6 +1022,7 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
convert_burst(&dwc->dma_sconfig.src_maxburst);
convert_burst(&dwc->dma_sconfig.dst_maxburst);
convert_slave_id(dwc);
return 0;
}
@ -1628,6 +1636,7 @@ dw_dma_parse_dt(struct platform_device *pdev)
static int dw_probe(struct platform_device *pdev)
{
const struct platform_device_id *match;
struct dw_dma_platform_data *pdata;
struct resource *io;
struct dw_dma *dw;
@ -1711,6 +1720,11 @@ static int dw_probe(struct platform_device *pdev)
memcpy(dw->data_width, pdata->data_width, 4);
}
/* Get the base request line if set */
match = platform_get_device_id(pdev);
if (match)
dw->request_line_base = (unsigned int)match->driver_data;
/* Calculate all channel mask before DMA setup */
dw->all_chan_mask = (1 << nr_channels) - 1;
@ -1906,7 +1920,8 @@ MODULE_DEVICE_TABLE(of, dw_dma_id_table);
#endif
static const struct platform_device_id dw_dma_ids[] = {
{ "INTL9C60", 0 },
/* Name, Request Line Base */
{ "INTL9C60", (kernel_ulong_t)16 },
{ }
};

1
drivers/dma/dw_dmac_regs.h
View file

@ -247,6 +247,7 @@ struct dw_dma {
/* hardware configuration */
unsigned char nr_masters;
unsigned char data_width[4];
unsigned int request_line_base;
struct dw_dma_chan chan[0];
};