Re: [PATCH v2] OMAP2+: mux: Fixed gpio mux mode analysis.

[Tony Lindgren <tony@atomide.com>]

* oleg.matcovschi@ti.com <oleg.matcovschi@ti.com> [121126 17:04]:
> From: Oleg Matcovschi <oleg.matcovschi@ti.com>
> 
> OMAP_MODE_GPIO() macro verified only OMAP_MUX_MODE4.
> It is not correct for following platforms:
>     2430 - gpio mux mode 3
>     44xx - gpio mux mode 3
>     54xx - gpio mux mode 6
> 
> Patch reserves first 3 bits in partition flags for storing gpio mux
> mode in same format as stored in control pad register.
> Modified OMAP_MODE_GPIO() macro to handle all possible cases of gpio mux mode.
> Modified omap_mux_init() flags of omap34xx to include OMAP_MUX_GPIO_IN_MODE4.

Thanks applying into omap-for-v3.8/fixes-for-merge-window.

Regards,

Tony
 
> Signed-off-by: Oleg Matcovschi <oleg.matcovschi@ti.com>
> ---
>  arch/arm/mach-omap2/mux.c     |   10 ++++------
>  arch/arm/mach-omap2/mux.h     |   20 +++++++++++++++-----
>  arch/arm/mach-omap2/mux34xx.c |    2 +-
>  3 files changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
> index 701e17c..1fa39dc 100644
> --- a/arch/arm/mach-omap2/mux.c
> +++ b/arch/arm/mach-omap2/mux.c
> @@ -134,10 +134,7 @@ static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
>  
>  	old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
>  	mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
> -	if (partition->flags & OMAP_MUX_GPIO_IN_MODE3)
> -		mux_mode |= OMAP_MUX_MODE3;
> -	else
> -		mux_mode |= OMAP_MUX_MODE4;
> +	mux_mode |= partition->gpio;
>  	pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
>  		 gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
>  	omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);
> @@ -799,7 +796,7 @@ int __init omap_mux_late_init(void)
>  			struct omap_mux *m = &e->mux;
>  			u16 mode = omap_mux_read(partition, m->reg_offset);
>  
> -			if (OMAP_MODE_GPIO(mode))
> +			if (OMAP_MODE_GPIO(partition, mode))
>  				continue;
>  
>  #ifndef CONFIG_DEBUG_FS
> @@ -1064,7 +1061,7 @@ static void __init omap_mux_init_list(struct omap_mux_partition *partition,
>  		}
>  #else
>  		/* Skip pins that are not muxed as GPIO by bootloader */
> -		if (!OMAP_MODE_GPIO(omap_mux_read(partition,
> +		if (!OMAP_MODE_GPIO(partition, omap_mux_read(partition,
>  				    superset->reg_offset))) {
>  			superset++;
>  			continue;
> @@ -1131,6 +1128,7 @@ int __init omap_mux_init(const char *name, u32 flags,
>  
>  	partition->name = name;
>  	partition->flags = flags;
> +	partition->gpio = flags & OMAP_MUX_MODE7;
>  	partition->size = mux_size;
>  	partition->phys = mux_pbase;
>  	partition->base = ioremap(mux_pbase, mux_size);
> diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
> index 76f9b3c..5504e12 100644
> --- a/arch/arm/mach-omap2/mux.h
> +++ b/arch/arm/mach-omap2/mux.h
> @@ -58,7 +58,8 @@
>  #define OMAP_PIN_OFF_INPUT_PULLDOWN	(OMAP_OFF_EN | OMAP_OFF_PULL_EN)
>  #define OMAP_PIN_OFF_WAKEUPENABLE	OMAP_WAKEUP_EN
>  
> -#define OMAP_MODE_GPIO(x)	(((x) & OMAP_MUX_MODE7) == OMAP_MUX_MODE4)
> +#define OMAP_MODE_GPIO(partition, x)	(((x) & OMAP_MUX_MODE7) == \
> +					  partition->gpio)
>  #define OMAP_MODE_UART(x)	(((x) & OMAP_MUX_MODE7) == OMAP_MUX_MODE0)
>  
>  /* Flags for omapX_mux_init */
> @@ -79,13 +80,20 @@
>  /*
>   * omap_mux_init flags definition:
>   *
> + * OMAP_GPIO_MUX_MODE, bits 0-2: gpio muxing mode, same like pad control
> + *      register which includes values from 0-7.
>   * OMAP_MUX_REG_8BIT: Ensure that access to padconf is done in 8 bits.
>   * The default value is 16 bits.
> - * OMAP_MUX_GPIO_IN_MODE3: The GPIO is selected in mode3.
> - * The default is mode4.
>   */
> -#define OMAP_MUX_REG_8BIT		(1 << 0)
> -#define OMAP_MUX_GPIO_IN_MODE3		(1 << 1)
> +#define OMAP_MUX_GPIO_IN_MODE0		OMAP_MUX_MODE0
> +#define OMAP_MUX_GPIO_IN_MODE1		OMAP_MUX_MODE1
> +#define OMAP_MUX_GPIO_IN_MODE2		OMAP_MUX_MODE2
> +#define OMAP_MUX_GPIO_IN_MODE3		OMAP_MUX_MODE3
> +#define OMAP_MUX_GPIO_IN_MODE4		OMAP_MUX_MODE4
> +#define OMAP_MUX_GPIO_IN_MODE5		OMAP_MUX_MODE5
> +#define OMAP_MUX_GPIO_IN_MODE6		OMAP_MUX_MODE6
> +#define OMAP_MUX_GPIO_IN_MODE7		OMAP_MUX_MODE7
> +#define OMAP_MUX_REG_8BIT		(1 << 3)
>  
>  /**
>   * struct omap_board_data - board specific device data
> @@ -105,6 +113,7 @@ struct omap_board_data {
>   * struct mux_partition - contain partition related information
>   * @name: name of the current partition
>   * @flags: flags specific to this partition
> + * @gpio: gpio mux mode 
>   * @phys: physical address
>   * @size: partition size
>   * @base: virtual address after ioremap
> @@ -114,6 +123,7 @@ struct omap_board_data {
>  struct omap_mux_partition {
>  	const char		*name;
>  	u32			flags;
> +	u32			gpio;
>  	u32			phys;
>  	u32			size;
>  	void __iomem		*base;
> diff --git a/arch/arm/mach-omap2/mux34xx.c b/arch/arm/mach-omap2/mux34xx.c
> index c47140b..c53609f4 100644
> --- a/arch/arm/mach-omap2/mux34xx.c
> +++ b/arch/arm/mach-omap2/mux34xx.c
> @@ -2053,7 +2053,7 @@ int __init omap3_mux_init(struct omap_board_mux *board_subset, int flags)
>  		return -EINVAL;
>  	}
>  
> -	return omap_mux_init("core", 0,
> +	return omap_mux_init("core", OMAP_MUX_GPIO_IN_MODE4,
>  			     OMAP3_CONTROL_PADCONF_MUX_PBASE,
>  			     OMAP3_CONTROL_PADCONF_MUX_SIZE,
>  			     omap3_muxmodes, package_subset, board_subset,
> -- 
> 1.7.4.1
>