diff options
| -rw-r--r-- | arch/arm/plat-nomadik/Kconfig | 6 | ||||
| -rw-r--r-- | arch/arm/plat-nomadik/gpio.c | 78 |
2 files changed, 60 insertions, 24 deletions
diff --git a/arch/arm/plat-nomadik/Kconfig b/arch/arm/plat-nomadik/Kconfig index 187f4e84bb2..ad25c963d43 100644 --- a/arch/arm/plat-nomadik/Kconfig +++ b/arch/arm/plat-nomadik/Kconfig @@ -25,4 +25,10 @@ config NOMADIK_GPIO help Support for the Nomadik GPIO controller. +config NOMADIK_GPIO_PM + bool + depends on NOMADIK_GPIO && PM + help + Support PM for the Nomadik GPIO controller. + endif diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c index 971e5d3798e..71682a87a87 100644 --- a/arch/arm/plat-nomadik/gpio.c +++ b/arch/arm/plat-nomadik/gpio.c @@ -30,11 +30,23 @@ /* * The GPIO module in the Nomadik family of Systems-on-Chip is an * AMBA device, managing 32 pins and alternate functions. The logic block - * is currently only used in the Nomadik. + * is currently used in the Nomadik and ux500. * * Symbols in this file are called "nmk_gpio" for "nomadik gpio" */ +static const u32 backup_regs[] = { + NMK_GPIO_PDIS, + NMK_GPIO_DIR, + NMK_GPIO_AFSLA, + NMK_GPIO_AFSLB, + NMK_GPIO_SLPC, + NMK_GPIO_RIMSC, + NMK_GPIO_FIMSC, + NMK_GPIO_RWIMSC, + NMK_GPIO_FWIMSC, +}; + struct nmk_gpio_chip { struct gpio_chip chip; void __iomem *addr; @@ -47,7 +59,9 @@ struct nmk_gpio_chip { /* Keep track of configured edges */ u32 edge_rising; u32 edge_falling; - u32 backup[10]; + u32 backup[ARRAY_SIZE(backup_regs)]; + /* Bitmap, 1 = pull up, 0 = pull down */ + u32 pull; }; static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip, @@ -93,10 +107,13 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, pdis &= ~bit; writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS); - if (pull == NMK_GPIO_PULL_UP) + if (pull == NMK_GPIO_PULL_UP) { + nmk_chip->pull |= bit; writel(bit, nmk_chip->addr + NMK_GPIO_DATS); - else if (pull == NMK_GPIO_PULL_DOWN) + } else if (pull == NMK_GPIO_PULL_DOWN) { + nmk_chip->pull &= ~bit; writel(bit, nmk_chip->addr + NMK_GPIO_DATC); + } } static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip, @@ -317,6 +334,15 @@ int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull) } /* Mode functions */ +/** + * nmk_gpio_set_mode() - set the mux mode of a gpio pin + * @gpio: pin number + * @gpio_mode: one of NMK_GPIO_ALT_GPIO, NMK_GPIO_ALT_A, + * NMK_GPIO_ALT_B, and NMK_GPIO_ALT_C + * + * Sets the mode of the specified pin to one of the alternate functions or + * plain GPIO. + */ int nmk_gpio_set_mode(int gpio, int gpio_mode) { struct nmk_gpio_chip *nmk_chip; @@ -832,35 +858,39 @@ out: return ret; } -#ifdef CONFIG_PM +#ifdef CONFIG_NOMADIK_GPIO_PM static int nmk_gpio_pm(struct platform_device *dev, bool suspend) { struct nmk_gpio_chip *nmk_chip = platform_get_drvdata(dev); int i; - static const unsigned int regs[] = { - NMK_GPIO_DAT, - NMK_GPIO_PDIS, - NMK_GPIO_DIR, - NMK_GPIO_AFSLA, - NMK_GPIO_AFSLB, - NMK_GPIO_SLPC, - NMK_GPIO_RIMSC, - NMK_GPIO_FIMSC, - NMK_GPIO_RWIMSC, - NMK_GPIO_FWIMSC, - }; + u32 dir; + u32 dat; - BUILD_BUG_ON(ARRAY_SIZE(nmk_chip->backup) != ARRAY_SIZE(regs)); - - /* XXX: is this sufficient? what about pull-up/down configuration? */ - - for (i = 0; i < ARRAY_SIZE(regs); i++) { + for (i = 0; i < ARRAY_SIZE(backup_regs); i++) { if (suspend) - nmk_chip->backup[i] = readl(nmk_chip->addr + regs[i]); + nmk_chip->backup[i] = readl(nmk_chip->addr + + backup_regs[i]); else - writel(nmk_chip->backup[i], nmk_chip->addr + regs[i]); + writel(nmk_chip->backup[i], + nmk_chip->addr + backup_regs[i]); } + if (!suspend) { + /* + * Restore pull-up and pull-down on inputs and + * outputs. + */ + dir = readl(nmk_chip->addr + NMK_GPIO_DIR); + dat = readl(nmk_chip->addr + NMK_GPIO_DAT); + + writel((nmk_chip->pull & ~dir) | + (dat & dir), + nmk_chip->addr + NMK_GPIO_DATS); + + writel((~nmk_chip->pull & ~dir) | + (~dat & dir), + nmk_chip->addr + NMK_GPIO_DATC); + } return 0; } |