[PATCH v4 04/10] dma-engine: sun4i: Add support for Allwinner suniv F1C100s

[Amit Singh Tomar]

Hi,

> 
> From: Mesih Kilinc <mesihkilinc at gmail.com>
> 
> DMA of Allwinner suniv F1C100s is similar to sun4i. It has 4 NDMA, 4
> DDMA channels and endpoints are different. Also F1C100s has reset bit
> for DMA in CCU. Add support for it.
> 
> Signed-off-by: Mesih Kilinc <mesihkilinc at gmail.com>
> [ csokas.bence: Rebased on current master ]
> Signed-off-by: Csókás, Bence <csokas.bence at prolan.hu>
> ---
>    drivers/dma/Kconfig     |  4 +--
>    drivers/dma/sun4i-dma.c | 60 +++++++++++++++++++++++++++++++++++++++++
>    2 files changed, 62 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index d9ec1e69e428..fc25bfc356f3 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -162,8 +162,8 @@ config DMA_SA11X0
>    
>    config DMA_SUN4I
>    	tristate "Allwinner A10 DMA SoCs support"
> -	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
> -	default (MACH_SUN4I || MACH_SUN5I || MACH_SUN7I)
> +	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUNIV
> +	default (MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUNIV)
>    	select DMA_ENGINE
>    	select DMA_VIRTUAL_CHANNELS
>    	help
> diff --git a/drivers/dma/sun4i-dma.c b/drivers/dma/sun4i-dma.c
> index 4626cc8ad114..c0a4e40134dc 100644
> --- a/drivers/dma/sun4i-dma.c
> +++ b/drivers/dma/sun4i-dma.c
> @@ -33,7 +33,11 @@
>    #define SUN4I_DMA_CFG_SRC_ADDR_MODE(mode)	((mode) << 5)
>    #define SUN4I_DMA_CFG_SRC_DRQ_TYPE(type)	(type)
>    
> +#define SUNIV_DMA_CFG_DST_DATA_WIDTH(width)	((width) << 24)
> +#define SUNIV_DMA_CFG_SRC_DATA_WIDTH(width)	((width) << 8)

nit: Are the extra parentheses around width truly necessary? They seem 
to be used throughout the file.

> +
>    #define SUN4I_MAX_BURST	8
> +#define SUNIV_MAX_BURST	4
>    
>    /** Normal DMA register values **/
>    
> @@ -41,6 +45,9 @@
>    #define SUN4I_NDMA_DRQ_TYPE_SDRAM		0x16
>    #define SUN4I_NDMA_DRQ_TYPE_LIMIT		(0x1F + 1)
>    
> +#define SUNIV_NDMA_DRQ_TYPE_SDRAM		0x11
> +#define SUNIV_NDMA_DRQ_TYPE_LIMIT		(0x17 + 1)
> +
>    /** Normal DMA register layout **/
>    
>    /* Dedicated DMA source/destination address mode values */
> @@ -54,6 +61,9 @@
>    #define SUN4I_NDMA_CFG_BYTE_COUNT_MODE_REMAIN	BIT(15)
>    #define SUN4I_NDMA_CFG_SRC_NON_SECURE		BIT(6)
>    
> +#define SUNIV_NDMA_CFG_CONT_MODE		BIT(29)
> +#define SUNIV_NDMA_CFG_WAIT_STATE(n)		((n) << 26)
> +
>    /** Dedicated DMA register values **/
>    
>    /* Dedicated DMA source/destination address mode values */
> @@ -66,6 +76,9 @@
>    #define SUN4I_DDMA_DRQ_TYPE_SDRAM		0x1
>    #define SUN4I_DDMA_DRQ_TYPE_LIMIT		(0x1F + 1)
>    
> +#define SUNIV_DDMA_DRQ_TYPE_SDRAM		0x1
> +#define SUNIV_DDMA_DRQ_TYPE_LIMIT		(0x9 + 1)
> +
>    /** Dedicated DMA register layout **/
>    
>    /* Dedicated DMA configuration register layout */
> @@ -119,6 +132,11 @@
>    #define SUN4I_DMA_NR_MAX_VCHANS						\
>    	(SUN4I_NDMA_NR_MAX_VCHANS + SUN4I_DDMA_NR_MAX_VCHANS)
>    
> +#define SUNIV_NDMA_NR_MAX_CHANNELS	4
> +#define SUNIV_DDMA_NR_MAX_CHANNELS	4
> +#define SUNIV_NDMA_NR_MAX_VCHANS	(24 * 2 - 1)
> +#define SUNIV_DDMA_NR_MAX_VCHANS	10
> +
>    /* This set of SUN4I_DDMA timing parameters were found experimentally while
>     * working with the SPI driver and seem to make it behave correctly */
>    #define SUN4I_DDMA_MAGIC_SPI_PARAMETERS \
> @@ -243,6 +261,16 @@ static void set_src_data_width_a10(u32 *p_cfg, s8 data_width)
>    	*p_cfg |= SUN4I_DMA_CFG_SRC_DATA_WIDTH(data_width);
>    }
>    
> +static void set_dst_data_width_f1c100s(u32 *p_cfg, s8 data_width)
> +{
> +	*p_cfg |= SUNIV_DMA_CFG_DST_DATA_WIDTH(data_width);
> +}
> +
> +static void set_src_data_width_f1c100s(u32 *p_cfg, s8 data_width)
> +{
> +	*p_cfg |= SUNIV_DMA_CFG_SRC_DATA_WIDTH(data_width);
> +}
> +
>    static int convert_burst_a10(u32 maxburst)
>    {
>    	if (maxburst > 8)
> @@ -252,6 +280,15 @@ static int convert_burst_a10(u32 maxburst)
>    	return (maxburst >> 2);
>    }
>    
> +static int convert_burst_f1c100s(u32 maxburst)
> +{
> +	if (maxburst > 4)
> +		return -EINVAL;
> +
> +	/* 1 -> 0, 4 -> 1 */
> +	return (maxburst >> 2);
> +}
> +
>    static int convert_buswidth(enum dma_slave_buswidth addr_width)
>    {
>    	if (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES)
> @@ -1379,8 +1416,31 @@ static struct sun4i_dma_config sun4i_a10_dma_cfg = {
>    	.has_reset		= false,
>    };
>    
> +static struct sun4i_dma_config suniv_f1c100s_dma_cfg = {
> +	.ndma_nr_max_channels	= SUNIV_NDMA_NR_MAX_CHANNELS,
> +	.ndma_nr_max_vchans	= SUNIV_NDMA_NR_MAX_VCHANS,
> +
> +	.ddma_nr_max_channels	= SUNIV_DDMA_NR_MAX_CHANNELS,
> +	.ddma_nr_max_vchans	= SUNIV_DDMA_NR_MAX_VCHANS,
> +
> +	.dma_nr_max_channels	= SUNIV_NDMA_NR_MAX_CHANNELS +
> +		SUNIV_DDMA_NR_MAX_CHANNELS,
> +
> +	.set_dst_data_width	= set_dst_data_width_f1c100s,
> +	.set_src_data_width	= set_src_data_width_f1c100s,
> +	.convert_burst		= convert_burst_f1c100s,
> +
> +	.ndma_drq_sdram		= SUNIV_NDMA_DRQ_TYPE_SDRAM,
> +	.ddma_drq_sdram		= SUNIV_DDMA_DRQ_TYPE_SDRAM,
> +
> +	.max_burst		= SUNIV_MAX_BURST,
> +	.has_reset		= true,
> +};
> +
>    static const struct of_device_id sun4i_dma_match[] = {
>    	{ .compatible = "allwinner,sun4i-a10-dma", .data = &sun4i_a10_dma_cfg },
> +	{ .compatible = "allwinner,suniv-f1c100s-dma",
> +		.data = &suniv_f1c100s_dma_cfg },
>    	{ /* sentinel */ },
>    };
>    MODULE_DEVICE_TABLE(of, sun4i_dma_match);
> -- 
> 2.34.1
> 
> 
>