pinctrl: exynos: Lock GPIOs as interrupts when used as EINTs

Currently after configuring a GPIO pin as an interrupt related pinmux
registers are changed, but there is no protection from calling
gpio_direction_*() in a badly written driver, which would cause the same
pinmux register to be reconfigured for regular input/output and this
disabling interrupt capability of the pin.

This patch addresses this issue by moving pinmux reconfiguration to
.irq_{request,release}_resources() callback of irq_chip and calling
gpio_lock_as_irq() helper to prevent reconfiguration of pin direction.

Setting up a GPIO interrupt on Samsung SoCs is a two-step operation -
in addition to trigger configuration in a dedicated register, the pinmux
must be also reconfigured to GPIO interrupt, which is a different function
than normal GPIO input, although I/O-wise they both behave in the same way
and gpio_get_value() can be used on a pin configured as IRQ as well.

Such design implies subtleties such as gpio_direction_input() not having
to fail if a pin is already configured as an interrupt nor change the
configuration to normal input. But the FLAG_USED_AS_IRQ set in gpiolib by
gpio_lock_as_irq() is only used to check that gpio_direction_output() is
not called, it's not used to prevent gpio_direction_input() to be called.
So this is not a complete solution for Samsung SoCs but it's definitely a
move in the right direction.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
[javier: use request resources instead of startup and expand commit message]
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 64 insertions, 6 deletions

diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.c b/drivers/pinctrl/samsung/pinctrl-exynos.c
index 003bfd874a61..d7154ed0b0eb 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos.c
+++ b/drivers/pinctrl/samsung/pinctrl-exynos.c
@@ -127,14 +127,10 @@ static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type)
         struct irq_chip *chip = irq_data_get_irq_chip(irqd);
         struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
         struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
-        struct samsung_pin_bank_type *bank_type = bank->type;
         struct samsung_pinctrl_drv_data *d = bank->drvdata;
-        unsigned int pin = irqd->hwirq;
-        unsigned int shift = EXYNOS_EINT_CON_LEN * pin;
+        unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq;
         unsigned int con, trig_type;
         unsigned long reg_con = our_chip->eint_con + bank->eint_offset;
-        unsigned long flags;
-        unsigned int mask;
 
         switch (type) {
         case IRQ_TYPE_EDGE_RISING:
@@ -167,8 +163,32 @@ static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type)
         con |= trig_type << shift;
         writel(con, d->virt_base + reg_con);
 
+        return 0;
+}
+
+static int exynos_irq_request_resources(struct irq_data *irqd)
+{
+        struct irq_chip *chip = irq_data_get_irq_chip(irqd);
+        struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
+        struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
+        struct samsung_pin_bank_type *bank_type = bank->type;
+        struct samsung_pinctrl_drv_data *d = bank->drvdata;
+        unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq;
+        unsigned long reg_con = our_chip->eint_con + bank->eint_offset;
+        unsigned long flags;
+        unsigned int mask;
+        unsigned int con;
+        int ret;
+
+        ret = gpio_lock_as_irq(&bank->gpio_chip, irqd->hwirq);
+        if (ret) {
+                dev_err(bank->gpio_chip.dev, "unable to lock pin %s-%lu IRQ\n",
+                        bank->name, irqd->hwirq);
+                return ret;
+        }
+
         reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
-        shift = pin * bank_type->fld_width[PINCFG_TYPE_FUNC];
+        shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
         mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
 
         spin_lock_irqsave(&bank->slock, flags);
@@ -180,9 +200,42 @@ static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type)
 
         spin_unlock_irqrestore(&bank->slock, flags);
 
+        exynos_irq_unmask(irqd);
+
         return 0;
 }
 
+static void exynos_irq_release_resources(struct irq_data *irqd)
+{
+        struct irq_chip *chip = irq_data_get_irq_chip(irqd);
+        struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip);
+        struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd);
+        struct samsung_pin_bank_type *bank_type = bank->type;
+        struct samsung_pinctrl_drv_data *d = bank->drvdata;
+        unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq;
+        unsigned long reg_con = our_chip->eint_con + bank->eint_offset;
+        unsigned long flags;
+        unsigned int mask;
+        unsigned int con;
+
+        reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC];
+        shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
+        mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
+
+        exynos_irq_mask(irqd);
+
+        spin_lock_irqsave(&bank->slock, flags);
+
+        con = readl(d->virt_base + reg_con);
+        con &= ~(mask << shift);
+        con |= FUNC_INPUT << shift;
+        writel(con, d->virt_base + reg_con);
+
+        spin_unlock_irqrestore(&bank->slock, flags);
+
+        gpio_unlock_as_irq(&bank->gpio_chip, irqd->hwirq);
+}
+
 /*
  * irq_chip for gpio interrupts.
  */
@@ -193,6 +246,8 @@ static struct exynos_irq_chip exynos_gpio_irq_chip = {
                 .irq_mask = exynos_irq_mask,
                 .irq_ack = exynos_irq_ack,
                 .irq_set_type = exynos_irq_set_type,
+                .irq_request_resources = exynos_irq_request_resources,
+                .irq_release_resources = exynos_irq_release_resources,
         },
         .eint_con = EXYNOS_GPIO_ECON_OFFSET,
         .eint_mask = EXYNOS_GPIO_EMASK_OFFSET,
@@ -336,6 +391,8 @@ static struct exynos_irq_chip exynos_wkup_irq_chip = {
                 .irq_ack = exynos_irq_ack,
                 .irq_set_type = exynos_irq_set_type,
                 .irq_set_wake = exynos_wkup_irq_set_wake,
+                .irq_request_resources = exynos_irq_request_resources,
+                .irq_release_resources = exynos_irq_release_resources,
         },
         .eint_con = EXYNOS_WKUP_ECON_OFFSET,
         .eint_mask = EXYNOS_WKUP_EMASK_OFFSET,
diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.h b/drivers/pinctrl/samsung/pinctrl-samsung.h
index 2b882320e8e9..5cedc9d26390 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.h
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.h
@@ -26,6 +26,7 @@
 #include <linux/gpio.h>
 
 /* pinmux function number for pin as gpio output line */
+#define FUNC_INPUT      0x0
 #define FUNC_OUTPUT     0x1
 
 /**