pinctrl: mediatek: extend eint build to pinctrl-mtk-common-v2.c

Almost all MediaTek SoCs apply the exact same logic to build eint, so move
the common functions into pinctrl-mtk-common-v2.c to allow each new pinctrl
driver to reuse them. Also, add a protection checker on hw->soc->eint_hw to
avoid invalid memory access when there's certain SoC not to define its
eint_hw properly in the code flow.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 137 insertions, 124 deletions

diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c
index f0390b34cae5..7cfab0cfd18c 100644
--- a/drivers/pinctrl/mediatek/pinctrl-moore.c
+++ b/drivers/pinctrl/mediatek/pinctrl-moore.c
@@ -584,130 +584,6 @@ static int mtk_build_functions(struct mtk_pinctrl *hw)
         return 0;
 }
 
-static int mtk_xt_find_eint_num(struct mtk_pinctrl *hw,
-                                unsigned long eint_n)
-{
-        const struct mtk_pin_desc *desc;
-        int i = 0;
-
-        desc = (const struct mtk_pin_desc *)hw->soc->pins;
-
-        while (i < hw->soc->npins) {
-                if (desc[i].eint.eint_n == eint_n)
-                        return desc[i].number;
-                i++;
-        }
-
-        return EINT_NA;
-}
-
-static int mtk_xt_get_gpio_n(void *data, unsigned long eint_n,
-                             unsigned int *gpio_n,
-                             struct gpio_chip **gpio_chip)
-{
-        struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
-        const struct mtk_pin_desc *desc;
-
-        desc = (const struct mtk_pin_desc *)hw->soc->pins;
-        *gpio_chip = &hw->chip;
-
-        /* Be greedy to guess first gpio_n is equal to eint_n */
-        if (desc[eint_n].eint.eint_n == eint_n)
-                *gpio_n = eint_n;
-        else
-                *gpio_n = mtk_xt_find_eint_num(hw, eint_n);
-
-        return *gpio_n == EINT_NA ? -EINVAL : 0;
-}
-
-static int mtk_xt_get_gpio_state(void *data, unsigned long eint_n)
-{
-        struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
-        struct gpio_chip *gpio_chip;
-        unsigned int gpio_n;
-        int err;
-
-        err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
-        if (err)
-                return err;
-
-        return mtk_gpio_get(gpio_chip, gpio_n);
-}
-
-static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
-{
-        struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
-        const struct mtk_pin_desc *desc;
-        struct gpio_chip *gpio_chip;
-        unsigned int gpio_n;
-        int err;
-
-        err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
-        if (err)
-                return err;
-
-        desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
-
-        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
-                               desc->eint.eint_m);
-        if (err)
-                return err;
-
-        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_INPUT);
-        if (err)
-                return err;
-
-        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_ENABLE);
-        if (err)
-                return err;
-
-        return 0;
-}
-
-static const struct mtk_eint_xt mtk_eint_xt = {
-        .get_gpio_n = mtk_xt_get_gpio_n,
-        .get_gpio_state = mtk_xt_get_gpio_state,
-        .set_gpio_as_eint = mtk_xt_set_gpio_as_eint,
-};
-
-static int
-mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
-{
-        struct device_node *np = pdev->dev.of_node;
-        struct resource *res;
-
-        if (!IS_ENABLED(CONFIG_EINT_MTK))
-                return 0;
-
-        if (!of_property_read_bool(np, "interrupt-controller"))
-                return -ENODEV;
-
-        hw->eint = devm_kzalloc(hw->dev, sizeof(*hw->eint), GFP_KERNEL);
-        if (!hw->eint)
-                return -ENOMEM;
-
-        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "eint");
-        if (!res) {
-                dev_err(&pdev->dev, "Unable to get eint resource\n");
-                return -ENODEV;
-        }
-
-        hw->eint->base = devm_ioremap_resource(&pdev->dev, res);
-        if (IS_ERR(hw->eint->base))
-                return PTR_ERR(hw->eint->base);
-
-        hw->eint->irq = irq_of_parse_and_map(np, 0);
-        if (!hw->eint->irq)
-                return -EINVAL;
-
-        hw->eint->dev = &pdev->dev;
-        hw->eint->hw = hw->soc->eint_hw;
-        hw->eint->pctl = hw;
-        hw->eint->gpio_xlate = &mtk_eint_xt;
-
-        return mtk_eint_do_init(hw->eint);
-}
-
 int mtk_moore_pinctrl_probe(struct platform_device *pdev,
                             const struct mtk_pin_soc *soc)
 {
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 7d5f570d7211..e8a2066a4d15 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -9,8 +9,11 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
+#include <linux/platform_device.h>
 #include <linux/io.h>
+#include <linux/of_irq.h>
 
+#include "mtk-eint.h"
 #include "pinctrl-mtk-common-v2.h"
 
 /**
@@ -207,6 +210,138 @@ int mtk_hw_get_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
         return 0;
 }
 
+static int mtk_xt_find_eint_num(struct mtk_pinctrl *hw, unsigned long eint_n)
+{
+        const struct mtk_pin_desc *desc;
+        int i = 0;
+
+        desc = (const struct mtk_pin_desc *)hw->soc->pins;
+
+        while (i < hw->soc->npins) {
+                if (desc[i].eint.eint_n == eint_n)
+                        return desc[i].number;
+                i++;
+        }
+
+        return EINT_NA;
+}
+
+static int mtk_xt_get_gpio_n(void *data, unsigned long eint_n,
+                             unsigned int *gpio_n,
+                             struct gpio_chip **gpio_chip)
+{
+        struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
+        const struct mtk_pin_desc *desc;
+
+        desc = (const struct mtk_pin_desc *)hw->soc->pins;
+        *gpio_chip = &hw->chip;
+
+        /* Be greedy to guess first gpio_n is equal to eint_n */
+        if (desc[eint_n].eint.eint_n == eint_n)
+                *gpio_n = eint_n;
+        else
+                *gpio_n = mtk_xt_find_eint_num(hw, eint_n);
+
+        return *gpio_n == EINT_NA ? -EINVAL : 0;
+}
+
+static int mtk_xt_get_gpio_state(void *data, unsigned long eint_n)
+{
+        struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
+        const struct mtk_pin_desc *desc;
+        struct gpio_chip *gpio_chip;
+        unsigned int gpio_n;
+        int value, err;
+
+        err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
+        if (err)
+                return err;
+
+        desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
+
+        err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
+        if (err)
+                return err;
+
+        return !!value;
+}
+
+static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
+{
+        struct mtk_pinctrl *hw = (struct mtk_pinctrl *)data;
+        const struct mtk_pin_desc *desc;
+        struct gpio_chip *gpio_chip;
+        unsigned int gpio_n;
+        int err;
+
+        err = mtk_xt_get_gpio_n(hw, eint_n, &gpio_n, &gpio_chip);
+        if (err)
+                return err;
+
+        desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
+
+        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
+                               desc->eint.eint_m);
+        if (err)
+                return err;
+
+        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, MTK_INPUT);
+        if (err)
+                return err;
+
+        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_ENABLE);
+        if (err)
+                return err;
+
+        return 0;
+}
+
+static const struct mtk_eint_xt mtk_eint_xt = {
+        .get_gpio_n = mtk_xt_get_gpio_n,
+        .get_gpio_state = mtk_xt_get_gpio_state,
+        .set_gpio_as_eint = mtk_xt_set_gpio_as_eint,
+};
+
+int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev)
+{
+        struct device_node *np = pdev->dev.of_node;
+        struct resource *res;
+
+        if (!IS_ENABLED(CONFIG_EINT_MTK))
+                return 0;
+
+        if (!of_property_read_bool(np, "interrupt-controller"))
+                return -ENODEV;
+
+        hw->eint = devm_kzalloc(hw->dev, sizeof(*hw->eint), GFP_KERNEL);
+        if (!hw->eint)
+                return -ENOMEM;
+
+        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "eint");
+        if (!res) {
+                dev_err(&pdev->dev, "Unable to get eint resource\n");
+                return -ENODEV;
+        }
+
+        hw->eint->base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(hw->eint->base))
+                return PTR_ERR(hw->eint->base);
+
+        hw->eint->irq = irq_of_parse_and_map(np, 0);
+        if (!hw->eint->irq)
+                return -EINVAL;
+
+        if (!hw->soc->eint_hw)
+                return -ENODEV;
+
+        hw->eint->dev = &pdev->dev;
+        hw->eint->hw = hw->soc->eint_hw;
+        hw->eint->pctl = hw;
+        hw->eint->gpio_xlate = &mtk_eint_xt;
+
+        return mtk_eint_do_init(hw->eint);
+}
+
 /* Revision 0 */
 int mtk_pinconf_bias_disable_set(struct mtk_pinctrl *hw,
                                  const struct mtk_pin_desc *desc)
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
index 05b9b391afea..e0d4e68b7cdd 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
@@ -245,6 +245,8 @@ int mtk_hw_set_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
 int mtk_hw_get_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc,
                      int field, int *value);
 
+int mtk_build_eint(struct mtk_pinctrl *hw, struct platform_device *pdev);
+
 int mtk_pinconf_bias_disable_set(struct mtk_pinctrl *hw,
                                  const struct mtk_pin_desc *desc);
 int mtk_pinconf_bias_disable_get(struct mtk_pinctrl *hw,