[PATCH] pinctrl: sunxi: fix pin numbers passed to register offset helpers

[boris.brezillon@free-electrons.com (Boris BREZILLON)]

Hello Chen-Yu,

On 22/05/2014 17:20, Chen-Yu Tsai wrote:
> The pin numbers passed to sunxi_*_reg helpers to get the correct
> registers should be the pin offset for the PIO block, not the
> absolute number we use that is based on the alphanumeric labels
> Allwinner uses.
>
> This patch subtracts .pin_base from the pin number passed to these
> functions, so the driver accesses the correct registers.

Thanks for fixing this bug.

>
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> ---
>
> Hi,
>
> This patch fixes the pinctrl driver failing to set pinmuxes for the R_PIO
> block found on the A31 and A23. The problem was found while working on
> bringing up the A23 SoC. The R_UART pins weren't properly muxed when
> the bootloader didn't use them.
>
> A thank you to Boris who also verified the issue.
>
>
> Cheers,
> ChenYu
>
> ---
>  drivers/pinctrl/sunxi/pinctrl-sunxi.c | 26 ++++++++++++++------------
>  1 file changed, 14 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> index f6522b5..59962fa 100644
> --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
> @@ -280,6 +280,7 @@ static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev,
>  	struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
>  	struct sunxi_pinctrl_group *g = &pctl->groups[group];
>  	unsigned long flags;
> +	unsigned pin = g->pin - pctl->desc->pin_base;
>  	u32 val, mask;
>  	u16 strength;
>  	u8 dlevel;
> @@ -303,23 +304,23 @@ static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev,
>  			 *   3: 40mA
>  			 */
>  			dlevel = strength / 10 - 1;
> -			val = readl(pctl->membase + sunxi_dlevel_reg(g->pin));
> -			mask = DLEVEL_PINS_MASK << sunxi_dlevel_offset(g->pin);
> +			val = readl(pctl->membase + sunxi_dlevel_reg(pin));
> +			mask = DLEVEL_PINS_MASK << sunxi_dlevel_offset(pin);
>  			writel((val & ~mask)
> -				| dlevel << sunxi_dlevel_offset(g->pin),
> -				pctl->membase + sunxi_dlevel_reg(g->pin));
> +				| dlevel << sunxi_dlevel_offset(pin),
> +				pctl->membase + sunxi_dlevel_reg(pin));
>  			break;
>  		case PIN_CONFIG_BIAS_PULL_UP:
> -			val = readl(pctl->membase + sunxi_pull_reg(g->pin));
> -			mask = PULL_PINS_MASK << sunxi_pull_offset(g->pin);
> -			writel((val & ~mask) | 1 << sunxi_pull_offset(g->pin),
> -				pctl->membase + sunxi_pull_reg(g->pin));
> +			val = readl(pctl->membase + sunxi_pull_reg(pin));
> +			mask = PULL_PINS_MASK << sunxi_pull_offset(pin);
> +			writel((val & ~mask) | 1 << sunxi_pull_offset(pin),
> +				pctl->membase + sunxi_pull_reg(pin));
>  			break;
>  		case PIN_CONFIG_BIAS_PULL_DOWN:
> -			val = readl(pctl->membase + sunxi_pull_reg(g->pin));
> -			mask = PULL_PINS_MASK << sunxi_pull_offset(g->pin);
> -			writel((val & ~mask) | 2 << sunxi_pull_offset(g->pin),
> -				pctl->membase + sunxi_pull_reg(g->pin));
> +			val = readl(pctl->membase + sunxi_pull_reg(pin));
> +			mask = PULL_PINS_MASK << sunxi_pull_offset(pin);
> +			writel((val & ~mask) | 2 << sunxi_pull_offset(pin),
> +				pctl->membase + sunxi_pull_reg(pin));
>  			break;
>  		default:
>  			break;
> @@ -376,6 +377,7 @@ static void sunxi_pmx_set(struct pinctrl_dev *pctldev,
>  
>  	spin_lock_irqsave(&pctl->lock, flags);
>  
> +	pin -= pctl->desc->pin_base;
>  	val = readl(pctl->membase + sunxi_mux_reg(pin));
>  	mask = MUX_PINS_MASK << sunxi_mux_offset(pin);
>  	writel((val & ~mask) | config << sunxi_mux_offset(pin),

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com