Commit 2a9fe9ae authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

dw_dmac: fill optional encoded parameters in register structure 



There is a block of the registers that are optional. However, if enabled they
contain useful information about the controller hardware configuration. We will
use this piece of data to autoconfigure the driver.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
parent f52b36d2

drivers/dma/dw_dmac_regs.h

+30 −0
Original line number Original line Diff line number Diff line
@@ -82,9 +82,39 @@ struct dw_dma_regs { 
	DW_REG(ID);

	DW_REG(ID);

	DW_REG(TEST);

	DW_REG(TEST);





	/* reserved */

	DW_REG(__reserved0);

	DW_REG(__reserved1);



	/* optional encoded params, 0x3c8..0x3f7 */

	/* optional encoded params, 0x3c8..0x3f7 */

	u32	__reserved;



	/* per-channel configuration registers */

	u32	DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS];

	u32	MULTI_BLK_TYPE;

	u32	MAX_BLK_SIZE;



	/* top-level parameters */

	u32	DW_PARAMS;

};

};





/* To access the registers in early stage of probe */

#define dma_read_byaddr(addr, name) \

	readl((addr) + offsetof(struct dw_dma_regs, name))



/* Bitfields in DW_PARAMS */

#define DW_PARAMS_NR_CHAN	8		/* number of channels */

#define DW_PARAMS_NR_MASTER	11		/* number of AHB masters */

#define DW_PARAMS_DATA_WIDTH(n)	(15 + 2 * (n))

#define DW_PARAMS_DATA_WIDTH1	15		/* master 1 data width */

#define DW_PARAMS_DATA_WIDTH2	17		/* master 2 data width */

#define DW_PARAMS_DATA_WIDTH3	19		/* master 3 data width */

#define DW_PARAMS_DATA_WIDTH4	21		/* master 4 data width */

#define DW_PARAMS_EN		28		/* encoded parameters */



/* Bitfields in DWC_PARAMS */

#define DWC_PARAMS_MBLK_EN	11		/* multi block transfer */



/* Bitfields in CTL_LO */

/* Bitfields in CTL_LO */

#define DWC_CTLL_INT_EN		(1 << 0)	/* irqs enabled? */

#define DWC_CTLL_INT_EN		(1 << 0)	/* irqs enabled? */

#define DWC_CTLL_DST_WIDTH(n)	((n)<<1)	/* bytes per element */

#define DWC_CTLL_DST_WIDTH(n)	((n)<<1)	/* bytes per element */

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