pinctrl: exynos: Handle suspend/resume of GPIO EINT registers

Some GPIO EINT control registers needs to be preserved across
suspend/resume cycle. This patch extends the driver to take care of
this.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 114 insertions, 3 deletions

diff --git a/drivers/pinctrl/pinctrl-exynos.c b/drivers/pinctrl/pinctrl-exynos.c
index 4f868e59227e..2d76f66a2e0b 100644
--- a/drivers/pinctrl/pinctrl-exynos.c
+++ b/drivers/pinctrl/pinctrl-exynos.c
@@ -196,6 +196,12 @@ static irqreturn_t exynos_eint_gpio_irq(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+struct exynos_eint_gpio_save {
+        u32 eint_con;
+        u32 eint_fltcon0;
+        u32 eint_fltcon1;
+};
+
 /*
  * exynos_eint_gpio_init() - setup handling of external gpio interrupts.
  * @d: driver data of samsung pinctrl driver.
@@ -204,8 +210,8 @@ static int exynos_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
 {
         struct samsung_pin_bank *bank;
         struct device *dev = d->dev;
-        unsigned int ret;
-        unsigned int i;
+        int ret;
+        int i;
 
         if (!d->irq) {
                 dev_err(dev, "irq number not available\n");
@@ -227,11 +233,29 @@ static int exynos_eint_gpio_init(struct samsung_pinctrl_drv_data *d)
                                 bank->nr_pins, &exynos_gpio_irqd_ops, bank);
                 if (!bank->irq_domain) {
                         dev_err(dev, "gpio irq domain add failed\n");
-                        return -ENXIO;
+                        ret = -ENXIO;
+                        goto err_domains;
+                }
+
+                bank->soc_priv = devm_kzalloc(d->dev,
+                        sizeof(struct exynos_eint_gpio_save), GFP_KERNEL);
+                if (!bank->soc_priv) {
+                        irq_domain_remove(bank->irq_domain);
+                        ret = -ENOMEM;
+                        goto err_domains;
                 }
         }
 
         return 0;
+
+err_domains:
+        for (--i, --bank; i >= 0; --i, --bank) {
+                if (bank->eint_type != EINT_TYPE_GPIO)
+                        continue;
+                irq_domain_remove(bank->irq_domain);
+        }
+
+        return ret;
 }
 
 static void exynos_wkup_irq_unmask(struct irq_data *irqd)
@@ -528,6 +552,72 @@ static int exynos_eint_wkup_init(struct samsung_pinctrl_drv_data *d)
         return 0;
 }
 
+static void exynos_pinctrl_suspend_bank(
+                                struct samsung_pinctrl_drv_data *drvdata,
+                                struct samsung_pin_bank *bank)
+{
+        struct exynos_eint_gpio_save *save = bank->soc_priv;
+        void __iomem *regs = drvdata->virt_base;
+
+        save->eint_con = readl(regs + EXYNOS_GPIO_ECON_OFFSET
+                                                + bank->eint_offset);
+        save->eint_fltcon0 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+                                                + 2 * bank->eint_offset);
+        save->eint_fltcon1 = readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+                                                + 2 * bank->eint_offset + 4);
+
+        pr_debug("%s: save     con %#010x\n", bank->name, save->eint_con);
+        pr_debug("%s: save fltcon0 %#010x\n", bank->name, save->eint_fltcon0);
+        pr_debug("%s: save fltcon1 %#010x\n", bank->name, save->eint_fltcon1);
+}
+
+static void exynos_pinctrl_suspend(struct samsung_pinctrl_drv_data *drvdata)
+{
+        struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
+        struct samsung_pin_bank *bank = ctrl->pin_banks;
+        int i;
+
+        for (i = 0; i < ctrl->nr_banks; ++i, ++bank)
+                if (bank->eint_type == EINT_TYPE_GPIO)
+                        exynos_pinctrl_suspend_bank(drvdata, bank);
+}
+
+static void exynos_pinctrl_resume_bank(
+                                struct samsung_pinctrl_drv_data *drvdata,
+                                struct samsung_pin_bank *bank)
+{
+        struct exynos_eint_gpio_save *save = bank->soc_priv;
+        void __iomem *regs = drvdata->virt_base;
+
+        pr_debug("%s:     con %#010x => %#010x\n", bank->name,
+                        readl(regs + EXYNOS_GPIO_ECON_OFFSET
+                        + bank->eint_offset), save->eint_con);
+        pr_debug("%s: fltcon0 %#010x => %#010x\n", bank->name,
+                        readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+                        + 2 * bank->eint_offset), save->eint_fltcon0);
+        pr_debug("%s: fltcon1 %#010x => %#010x\n", bank->name,
+                        readl(regs + EXYNOS_GPIO_EFLTCON_OFFSET
+                        + 2 * bank->eint_offset + 4), save->eint_fltcon1);
+
+        writel(save->eint_con, regs + EXYNOS_GPIO_ECON_OFFSET
+                                                + bank->eint_offset);
+        writel(save->eint_fltcon0, regs + EXYNOS_GPIO_EFLTCON_OFFSET
+                                                + 2 * bank->eint_offset);
+        writel(save->eint_fltcon1, regs + EXYNOS_GPIO_EFLTCON_OFFSET
+                                                + 2 * bank->eint_offset + 4);
+}
+
+static void exynos_pinctrl_resume(struct samsung_pinctrl_drv_data *drvdata)
+{
+        struct samsung_pin_ctrl *ctrl = drvdata->ctrl;
+        struct samsung_pin_bank *bank = ctrl->pin_banks;
+        int i;
+
+        for (i = 0; i < ctrl->nr_banks; ++i, ++bank)
+                if (bank->eint_type == EINT_TYPE_GPIO)
+                        exynos_pinctrl_resume_bank(drvdata, bank);
+}
+
 /* pin banks of exynos4210 pin-controller 0 */
 static struct samsung_pin_bank exynos4210_pin_banks0[] = {
         EXYNOS_PIN_BANK_EINTG(8, 0x000, "gpa0", 0x00),
@@ -591,6 +681,8 @@ struct samsung_pin_ctrl exynos4210_pin_ctrl[] = {
                 .geint_pend     = EXYNOS_GPIO_EPEND_OFFSET,
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos4210-gpio-ctrl0",
         }, {
                 /* pin-controller instance 1 data */
@@ -605,6 +697,8 @@ struct samsung_pin_ctrl exynos4210_pin_ctrl[] = {
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
                 .eint_wkup_init = exynos_eint_wkup_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos4210-gpio-ctrl1",
         }, {
                 /* pin-controller instance 2 data */
@@ -686,6 +780,8 @@ struct samsung_pin_ctrl exynos4x12_pin_ctrl[] = {
                 .geint_pend     = EXYNOS_GPIO_EPEND_OFFSET,
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos4x12-gpio-ctrl0",
         }, {
                 /* pin-controller instance 1 data */
@@ -700,6 +796,8 @@ struct samsung_pin_ctrl exynos4x12_pin_ctrl[] = {
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
                 .eint_wkup_init = exynos_eint_wkup_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos4x12-gpio-ctrl1",
         }, {
                 /* pin-controller instance 2 data */
@@ -710,6 +808,8 @@ struct samsung_pin_ctrl exynos4x12_pin_ctrl[] = {
                 .geint_pend     = EXYNOS_GPIO_EPEND_OFFSET,
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos4x12-gpio-ctrl2",
         }, {
                 /* pin-controller instance 3 data */
@@ -720,6 +820,8 @@ struct samsung_pin_ctrl exynos4x12_pin_ctrl[] = {
                 .geint_pend     = EXYNOS_GPIO_EPEND_OFFSET,
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos4x12-gpio-ctrl3",
         },
 };
@@ -798,6 +900,8 @@ struct samsung_pin_ctrl exynos5250_pin_ctrl[] = {
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
                 .eint_wkup_init = exynos_eint_wkup_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos5250-gpio-ctrl0",
         }, {
                 /* pin-controller instance 1 data */
@@ -808,6 +912,8 @@ struct samsung_pin_ctrl exynos5250_pin_ctrl[] = {
                 .geint_pend     = EXYNOS_GPIO_EPEND_OFFSET,
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos5250-gpio-ctrl1",
         }, {
                 /* pin-controller instance 2 data */
@@ -818,6 +924,8 @@ struct samsung_pin_ctrl exynos5250_pin_ctrl[] = {
                 .geint_pend     = EXYNOS_GPIO_EPEND_OFFSET,
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos5250-gpio-ctrl2",
         }, {
                 /* pin-controller instance 3 data */
@@ -828,6 +936,8 @@ struct samsung_pin_ctrl exynos5250_pin_ctrl[] = {
                 .geint_pend     = EXYNOS_GPIO_EPEND_OFFSET,
                 .svc            = EXYNOS_SVC_OFFSET,
                 .eint_gpio_init = exynos_eint_gpio_init,
+                .suspend        = exynos_pinctrl_suspend,
+                .resume         = exynos_pinctrl_resume,
                 .label          = "exynos5250-gpio-ctrl3",
         },
 };
diff --git a/drivers/pinctrl/pinctrl-exynos.h b/drivers/pinctrl/pinctrl-exynos.h
index 9b1f77a5bf0f..3c91c357792f 100644
--- a/drivers/pinctrl/pinctrl-exynos.h
+++ b/drivers/pinctrl/pinctrl-exynos.h
@@ -19,6 +19,7 @@
 
 /* External GPIO and wakeup interrupt related definitions */
 #define EXYNOS_GPIO_ECON_OFFSET         0x700
+#define EXYNOS_GPIO_EFLTCON_OFFSET      0x800
 #define EXYNOS_GPIO_EMASK_OFFSET        0x900
 #define EXYNOS_GPIO_EPEND_OFFSET        0xA00
 #define EXYNOS_WKUP_ECON_OFFSET         0xE00