pinctrl: mediatek: add EINT support to MT7622 SoC

Add EINT support to MT7622 SoC and the support is made as just an option
to MT7622 pinctrl.

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

diff --git a/drivers/pinctrl/mediatek/Kconfig b/drivers/pinctrl/mediatek/Kconfig
index 310db42..9905dc6 100644 (file)
--- a/drivers/pinctrl/mediatek/Kconfig
+++ b/drivers/pinctrl/mediatek/Kconfig
@@ -3,7 +3,7 @@ menu "MediaTek pinctrl drivers"
 
 config EINT_MTK
        bool "MediaTek External Interrupt Support"
-       depends on PINCTRL_MTK || COMPILE_TEST
+       depends on PINCTRL_MTK || PINCTRL_MT7622 || COMPILE_TEST
        select IRQ_DOMAIN
 
 config PINCTRL_MTK

diff --git a/drivers/pinctrl/mediatek/pinctrl-mt7622.c b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
index 06e8406..ad6da11 100644 (file)
--- a/drivers/pinctrl/mediatek/pinctrl-mt7622.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
@@ -19,6 +19,7 @@
 #include <linux/init.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pinctrl/pinctrl.h>
@@ -30,6 +31,7 @@
 #include "../core.h"
 #include "../pinconf.h"
 #include "../pinmux.h"
+#include "mtk-eint.h"
 
 #define PINCTRL_PINCTRL_DEV            KBUILD_MODNAME
 #define MTK_RANGE(_a)          { .range = (_a), .nranges = ARRAY_SIZE(_a), }
@@ -123,6 +125,8 @@ struct mtk_pin_soc {
        unsigned int                    ngrps;
        const struct function_desc      *funcs;
        unsigned int                    nfuncs;
+       const struct mtk_eint_regs      *eint_regs;
+       const struct mtk_eint_hw        *eint_hw;
 };
 
 struct mtk_pinctrl {
@@ -131,6 +135,7 @@ struct mtk_pinctrl {
        struct device                   *dev;
        struct gpio_chip                chip;
        const struct mtk_pin_soc        *soc;
+       struct mtk_eint                 *eint;
 };
 
 static const struct mtk_pin_field_calc mt7622_pin_mode_range[] = {
@@ -913,6 +918,13 @@ static const struct pin_config_item mtk_conf_items[] = {
 };
 #endif
 
+static const struct mtk_eint_hw mt7622_eint_hw = {
+       .port_mask = 7,
+       .ports     = 7,
+       .ap_num    = ARRAY_SIZE(mt7622_pins),
+       .db_cnt    = 20,
+};
+
 static const struct mtk_pin_soc mt7622_data = {
        .reg_cal = mt7622_reg_cals,
        .pins = mt7622_pins,
@@ -921,6 +933,7 @@ static const struct mtk_pin_soc mt7622_data = {
        .ngrps = ARRAY_SIZE(mt7622_groups),
        .funcs = mt7622_functions,
        .nfuncs = ARRAY_SIZE(mt7622_functions),
+       .eint_hw = &mt7622_eint_hw,
 };
 
 static void mtk_w32(struct mtk_pinctrl *pctl, u32 reg, u32 val)
@@ -1441,6 +1454,32 @@ static int mtk_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio,
        return pinctrl_gpio_direction_output(chip->base + gpio);
 }
 
+static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+       struct mtk_pinctrl *hw = gpiochip_get_data(chip);
+       unsigned long eint_n;
+
+       eint_n = offset;
+
+       return mtk_eint_find_irq(hw->eint, eint_n);
+}
+
+static int mtk_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+                              unsigned long config)
+{
+       struct mtk_pinctrl *hw = gpiochip_get_data(chip);
+       unsigned long eint_n;
+       u32 debounce;
+
+       if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
+               return -ENOTSUPP;
+
+       debounce = pinconf_to_config_argument(config);
+       eint_n = offset;
+
+       return mtk_eint_set_debounce(hw->eint, eint_n, debounce);
+}
+
 static int mtk_build_gpiochip(struct mtk_pinctrl *hw, struct device_node *np)
 {
        struct gpio_chip *chip = &hw->chip;
@@ -1454,6 +1493,8 @@ static int mtk_build_gpiochip(struct mtk_pinctrl *hw, struct device_node *np)
        chip->direction_output  = mtk_gpio_direction_output;
        chip->get               = mtk_gpio_get;
        chip->set               = mtk_gpio_set;
+       chip->to_irq            = mtk_gpio_to_irq,
+       chip->set_config        = mtk_gpio_set_config,
        chip->base              = -1;
        chip->ngpio             = hw->soc->npins;
        chip->of_node           = np;
@@ -1514,6 +1555,103 @@ static int mtk_build_functions(struct mtk_pinctrl *hw)
        return 0;
 }
 
+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;
+
+       *gpio_chip = &hw->chip;
+       *gpio_n = eint_n;
+
+       return 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;
+       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;
+
+       err = mtk_hw_set_value(hw, gpio_n, PINCTRL_PIN_REG_MODE,
+                              MTK_GPIO_MODE);
+       if (err)
+               return err;
+
+       err = mtk_hw_set_value(hw, gpio_n, PINCTRL_PIN_REG_DIR, MTK_INPUT);
+       if (err)
+               return err;
+
+       err = mtk_hw_set_value(hw, gpio_n, 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);
+}
+
 static const struct of_device_id mtk_pinctrl_of_match[] = {
        { .compatible = "mediatek,mt7622-pinctrl", .data = &mt7622_data},
        { }
@@ -1577,6 +1715,11 @@ static int mtk_pinctrl_probe(struct platform_device *pdev)
                return err;
        }
 
+       err = mtk_build_eint(hw, pdev);
+       if (err)
+               dev_warn(&pdev->dev,
+                        "Failed to add EINT, but pinctrl still can work\n");
+
        platform_set_drvdata(pdev, hw);
 
        return 0;