[PATCH] ARM i.MX31: add SPI support

[Sascha Hauer]

On Wed, Jul 27, 2016 at 04:42:04PM +0200, Alexander Kurz wrote:
> The i.MX31 SPI interface was refered by freescale as spi_ver_0_4 in one
> of their older vendor extended linux releases. spi_ver_0_4 differs only
> in minor aspects to spi_ver_0_7 (i.MX35) which is already supported by
> barebox.
> Regarding barebox, the differences boil down to the location and length
> of the CHIP SELECT and BIT COUNT/BURST LENGTH elements of CONREG. The
> spi_ver_0_4 variant is limited to single word bursts with a maximum of
> 32 bits_per_word.
> 
> Add support for the i.MX31 SPI interface to the barebox spi_ver_0_7
> implementation.
> 
> Signed-off-by: Alexander Kurz <akurz at blala.de>

Applied, thanks

Sascha

> ---
>  arch/arm/mach-imx/include/mach/devices-imx31.h |  6 +++---
>  drivers/spi/Kconfig                            |  2 +-
>  drivers/spi/imx_spi.c                          | 15 ++++++++++++---
>  include/spi/imx-spi.h                          |  7 +++++++
>  4 files changed, 23 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/include/mach/devices-imx31.h b/arch/arm/mach-imx/include/mach/devices-imx31.h
> index 63319fe..7c70e40 100644
> --- a/arch/arm/mach-imx/include/mach/devices-imx31.h
> +++ b/arch/arm/mach-imx/include/mach/devices-imx31.h
> @@ -4,17 +4,17 @@
>  
>  static inline struct device_d *imx31_add_spi0(struct spi_imx_master *pdata)
>  {
> -	return imx_add_spi_imx27((void *)MX31_CSPI1_BASE_ADDR, 0, pdata);
> +	return imx_add_spi_imx35((void *)MX31_CSPI1_BASE_ADDR, 0, pdata);
>  }
>  
>  static inline struct device_d *imx31_add_spi1(struct spi_imx_master *pdata)
>  {
> -	return imx_add_spi_imx27((void *)MX31_CSPI2_BASE_ADDR, 1, pdata);
> +	return imx_add_spi_imx35((void *)MX31_CSPI2_BASE_ADDR, 1, pdata);
>  }
>  
>  static inline struct device_d *imx31_add_spi2(struct spi_imx_master *pdata)
>  {
> -	return imx_add_spi_imx27((void *)MX31_CSPI3_BASE_ADDR, 2, pdata);
> +	return imx_add_spi_imx35((void *)MX31_CSPI3_BASE_ADDR, 2, pdata);
>  }
>  
>  static inline struct device_d *imx31_add_uart0(void)
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 738b88e..9a71b3b 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -33,7 +33,7 @@ config DRIVER_SPI_IMX_0_0
>  
>  config DRIVER_SPI_IMX_0_7
>  	bool
> -	depends on ARCH_IMX25 || ARCH_IMX35 || ARCH_IMX53
> +	depends on ARCH_IMX25 || ARCH_IMX31 || ARCH_IMX35 || ARCH_IMX53
>  	default y
>  
>  config DRIVER_SPI_IMX_2_3
> diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c
> index 99ec228..67968e0 100644
> --- a/drivers/spi/imx_spi.c
> +++ b/drivers/spi/imx_spi.c
> @@ -206,7 +206,12 @@ static void cspi_0_7_chipselect(struct spi_device *spi, int is_active)
>  	reg |= spi_imx_clkdiv_2(clk_get_rate(imx->clk), spi->max_speed_hz) <<
>  		CSPI_0_7_CTRL_DR_SHIFT;
>  
> -	reg |= (spi->bits_per_word - 1) << CSPI_0_7_CTRL_BL_SHIFT;
> +	if (cpu_is_mx31())
> +		reg |= ((spi->bits_per_word - 1) & CSPI_0_4_CTRL_BL_MASK)
> +			<< CSPI_0_4_CTRL_BL_SHIFT;
> +	else
> +		reg |= (spi->bits_per_word - 1) << CSPI_0_7_CTRL_BL_SHIFT;
> +
>  	reg |= CSPI_0_7_CTRL_SSCTL;
>  
>  	if (spi->mode & SPI_CPHA)
> @@ -215,8 +220,12 @@ static void cspi_0_7_chipselect(struct spi_device *spi, int is_active)
>  		reg |= CSPI_0_7_CTRL_POL;
>  	if (spi->mode & SPI_CS_HIGH)
>  		reg |= CSPI_0_7_CTRL_SSPOL;
> -	if (gpio < 0)
> -		reg |= (gpio + 32) << CSPI_0_7_CTRL_CS_SHIFT;
> +	if (gpio < 0) {
> +		if (cpu_is_mx31())
> +			reg |= (gpio + 32) << CSPI_0_4_CTRL_CS_SHIFT;
> +		else
> +			reg |= (gpio + 32) << CSPI_0_7_CTRL_CS_SHIFT;
> +	}
>  
>  	writel(reg, base + CSPI_0_7_CTRL);
>  
> diff --git a/include/spi/imx-spi.h b/include/spi/imx-spi.h
> index 221c665..a592573 100644
> --- a/include/spi/imx-spi.h
> +++ b/include/spi/imx-spi.h
> @@ -40,6 +40,12 @@
>  
>  #define CSPI_0_0_RESET_START		(1 << 0)
>  
> +#define CSPI_0_4_CTRL			0x08
> +#define CSPI_0_4_CTRL_BL_SHIFT		8
> +#define CSPI_0_4_CTRL_BL_MASK		0x1f
> +#define CSPI_0_4_CTRL_DRCTL_SHIFT	20
> +#define CSPI_0_4_CTRL_CS_SHIFT		24
> +
>  #define CSPI_0_7_RXDATA			0x00
>  #define CSPI_0_7_TXDATA			0x04
>  #define CSPI_0_7_CTRL			0x08
> @@ -50,6 +56,7 @@
>  #define CSPI_0_7_CTRL_PHA		(1 << 5)
>  #define CSPI_0_7_CTRL_SSCTL		(1 << 6)
>  #define CSPI_0_7_CTRL_SSPOL		(1 << 7)
> +#define CSPI_0_7_CTRL_DRCTL_SHIFT	8
>  #define CSPI_0_7_CTRL_CS_SHIFT		12
>  #define CSPI_0_7_CTRL_DR_SHIFT		16
>  #define CSPI_0_7_CTRL_BL_SHIFT		20
> -- 
> 2.1.4
> 
> 
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