diff options
| author | Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> | 2016-11-25 17:59:07 +0300 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-11-30 06:27:50 +0300 |
| commit | bd2c6636cc59c4626a04d9918953a107f88eaff9 (patch) | |
| tree | 7344ad146e1b6be5f86b5584563195b060cd489f /drivers/dma/dw | |
| parent | 258f2277a93fe0e3cdac275264d275c526170db6 (diff) | |
| download | linux-bd2c6636cc59c4626a04d9918953a107f88eaff9.tar.xz | |
dmaengine: DW DMAC: add multi-block property to device tree
Several versions of DW DMAC have multi block transfers hardware
support. Hardware support of multi block transfers is disabled
by default if we use DT to configure DMAC and software emulation
of multi block transfers used instead.
Add multi-block property, so it is possible to enable hardware
multi block transfers (if present) via DT.
Switch from per device is_nollp variable to multi_block array
to be able enable/disable multi block transfers separately per
channel.
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/dw')
| -rw-r--r-- | drivers/dma/dw/core.c | 2 | ||||
| -rw-r--r-- | drivers/dma/dw/platform.c | 12 | ||||
| -rw-r--r-- | drivers/dma/dw/regs.h | 3 |
3 files changed, 14 insertions, 3 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index c2c0a613cb7a..e5adf5d1c34f 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -1569,7 +1569,7 @@ int dw_dma_probe(struct dw_dma_chip *chip) (dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0; } else { dwc->block_size = pdata->block_size; - dwc->nollp = pdata->is_nollp; + dwc->nollp = !pdata->multi_block[i]; } } diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c index aa7a5c1b9bf8..b1655e40cfa2 100644 --- a/drivers/dma/dw/platform.c +++ b/drivers/dma/dw/platform.c @@ -102,7 +102,7 @@ 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[DW_DMA_MAX_NR_MASTERS]; + u32 tmp, arr[DW_DMA_MAX_NR_MASTERS], mb[DW_DMA_MAX_NR_CHANNELS]; u32 nr_masters; u32 nr_channels; @@ -118,6 +118,8 @@ dw_dma_parse_dt(struct platform_device *pdev) if (of_property_read_u32(np, "dma-channels", &nr_channels)) return NULL; + if (nr_channels > DW_DMA_MAX_NR_CHANNELS) + return NULL; pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) @@ -152,6 +154,14 @@ dw_dma_parse_dt(struct platform_device *pdev) pdata->data_width[tmp] = BIT(arr[tmp] & 0x07); } + if (!of_property_read_u32_array(np, "multi-block", mb, nr_channels)) { + for (tmp = 0; tmp < nr_channels; tmp++) + pdata->multi_block[tmp] = mb[tmp]; + } else { + for (tmp = 0; tmp < nr_channels; tmp++) + pdata->multi_block[tmp] = 1; + } + return pdata; } #else diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h index f65dd104479f..4e0128c62704 100644 --- a/drivers/dma/dw/regs.h +++ b/drivers/dma/dw/regs.h @@ -12,7 +12,8 @@ #include <linux/interrupt.h> #include <linux/dmaengine.h> -#define DW_DMA_MAX_NR_CHANNELS 8 +#include "internal.h" + #define DW_DMA_MAX_NR_REQUESTS 16 /* flow controller */ |