pinctrl: mediatek: add driving strength related support to pinctrl-mtk-common-v2.c

Put driving strength support related functions to pinctrl-mtk-common-v2.c
as these operations might be different by chips and allow different type
of driver to reuse them.

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

4 files changed, 112 insertions, 31 deletions

diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c
index b412b65d0441..1f0cd306a940 100644
--- a/drivers/pinctrl/mediatek/pinctrl-moore.c
+++ b/drivers/pinctrl/mediatek/pinctrl-moore.c
@@ -82,6 +82,9 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
         u32 param = pinconf_to_config_param(*config);
         int val, val2, err, reg, ret = 1;
+        const struct mtk_pin_desc *desc;
+
+        desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
 
         switch (param) {
         case PIN_CONFIG_BIAS_DISABLE:
@@ -139,19 +142,13 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
 
                 break;
         case PIN_CONFIG_DRIVE_STRENGTH:
-                err = mtk_hw_get_value(hw, pin, PINCTRL_PIN_REG_E4, &val);
-                if (err)
-                        return err;
-
-                err = mtk_hw_get_value(hw, pin, PINCTRL_PIN_REG_E8, &val2);
-                if (err)
-                        return err;
-
-                /* 4mA when (e8, e4) = (0, 0); 8mA when (e8, e4) = (0, 1)
-                 * 12mA when (e8, e4) = (1, 0); 16mA when (e8, e4) = (1, 1)
-                 */
-                ret = ((val2 << 1) + val + 1) * 4;
-
+                if (hw->soc->drive_get) {
+                        err = hw->soc->drive_get(hw, desc, &ret);
+                        if (err)
+                                return err;
+                } else {
+                        err = -ENOTSUPP;
+                }
                 break;
         case MTK_PIN_CONFIG_TDSEL:
         case MTK_PIN_CONFIG_RDSEL:
@@ -178,9 +175,12 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
                            unsigned long *configs, unsigned int num_configs)
 {
         struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
+        const struct mtk_pin_desc *desc;
         u32 reg, param, arg;
         int cfg, err = 0;
 
+        desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
+
         for (cfg = 0; cfg < num_configs; cfg++) {
                 param = pinconf_to_config_param(configs[cfg]);
                 arg = pinconf_to_config_argument(configs[cfg]);
@@ -247,24 +247,10 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
                                 goto err;
                         break;
                 case PIN_CONFIG_DRIVE_STRENGTH:
-                        /* 4mA when (e8, e4) = (0, 0);
-                         * 8mA when (e8, e4) = (0, 1);
-                         * 12mA when (e8, e4) = (1, 0);
-                         * 16mA when (e8, e4) = (1, 1)
-                         */
-                        if (!(arg % 4) && (arg >= 4 && arg <= 16)) {
-                                arg = arg / 4 - 1;
-                                err = mtk_hw_set_value(hw, pin,
-                                                       PINCTRL_PIN_REG_E4,
-                                                       arg & 0x1);
-                                if (err)
-                                        goto err;
-
-                                err = mtk_hw_set_value(hw, pin,
-                                                       PINCTRL_PIN_REG_E8,
-                                                       (arg & 0x2) >> 1);
-                                if (err)
-                                        goto err;
+                        if (hw->soc->drive_set) {
+                                err = hw->soc->drive_set(hw, desc, arg);
+                        if (err)
+                                return err;
                         } else {
                                 err = -ENOTSUPP;
                         }
diff --git a/drivers/pinctrl/mediatek/pinctrl-mt7622.c b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
index 2fe1f27e21bc..f6904a925755 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mt7622.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
@@ -767,6 +767,8 @@ static const struct mtk_pin_soc mt7622_data = {
         .eint_hw = &mt7622_eint_hw,
         .gpio_m = 1,
         .eint_m = 1,
+        .drive_set = mtk_pinconf_drive_set,
+        .drive_get = mtk_pinconf_drive_get,
 };
 
 static const struct of_device_id mt7622_pinctrl_of_match[] = {
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 2a168043a6f0..886b40ec3b3f 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -13,6 +13,32 @@
 
 #include "pinctrl-mtk-common-v2.h"
 
+/**
+ * struct mtk_drive_desc - the structure that holds the information
+ *                          of the driving current
+ * @min:        the minimum current of this group
+ * @max:        the maximum current of this group
+ * @step:       the step current of this group
+ * @scal:       the weight factor
+ *
+ * formula: output = ((input) / step - 1) * scal
+ */
+struct mtk_drive_desc {
+        u8 min;
+        u8 max;
+        u8 step;
+        u8 scal;
+};
+
+/* The groups of drive strength */
+const struct mtk_drive_desc mtk_drive[] = {
+        [DRV_GRP0] = { 4, 16, 4, 1 },
+        [DRV_GRP1] = { 4, 16, 4, 2 },
+        [DRV_GRP2] = { 2, 8, 2, 1 },
+        [DRV_GRP3] = { 2, 8, 2, 2 },
+        [DRV_GRP4] = { 2, 16, 2, 1 },
+};
+
 static void mtk_w32(struct mtk_pinctrl *pctl, u32 reg, u32 val)
 {
         writel_relaxed(val, pctl->base + reg);
@@ -163,3 +189,56 @@ int mtk_hw_get_value(struct mtk_pinctrl *hw, int pin, int field, int *value)
 
         return 0;
 }
+
+/* Revision 0 */
+int mtk_pinconf_drive_set(struct mtk_pinctrl *hw,
+                          const struct mtk_pin_desc *desc, u32 arg)
+{
+        const struct mtk_drive_desc *tb;
+        int err = -ENOTSUPP;
+
+        tb = &mtk_drive[desc->drv_n];
+        /* 4mA when (e8, e4) = (0, 0)
+         * 8mA when (e8, e4) = (0, 1)
+         * 12mA when (e8, e4) = (1, 0)
+         * 16mA when (e8, e4) = (1, 1)
+         */
+        if ((arg >= tb->min && arg <= tb->max) && !(arg % tb->step)) {
+                arg = (arg / tb->step - 1) * tb->scal;
+                err = mtk_hw_set_value(hw, desc->number, PINCTRL_PIN_REG_E4,
+                                       arg & 0x1);
+                if (err)
+                        return err;
+
+                err = mtk_hw_set_value(hw, desc->number, PINCTRL_PIN_REG_E8,
+                                       (arg & 0x2) >> 1);
+                if (err)
+                        return err;
+        }
+
+        return err;
+}
+
+int mtk_pinconf_drive_get(struct mtk_pinctrl *hw,
+                          const struct mtk_pin_desc *desc, int *val)
+{
+        const struct mtk_drive_desc *tb;
+        int err, val1, val2;
+
+        tb = &mtk_drive[desc->drv_n];
+
+        err = mtk_hw_get_value(hw, desc->number, PINCTRL_PIN_REG_E4, &val1);
+        if (err)
+                return err;
+
+        err = mtk_hw_get_value(hw, desc->number, PINCTRL_PIN_REG_E8, &val2);
+        if (err)
+                return err;
+
+        /* 4mA when (e8, e4) = (0, 0); 8mA when (e8, e4) = (0, 1)
+         * 12mA when (e8, e4) = (1, 0); 16mA when (e8, e4) = (1, 1)
+         */
+        *val = (((val2 << 1) + val1) / tb->scal + 1) * tb->step;
+
+        return 0;
+}
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
index 6041024a438f..727e5aaca52f 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
@@ -50,6 +50,7 @@ enum {
         PINCTRL_PIN_REG_E8,
         PINCTRL_PIN_REG_TDSEL,
         PINCTRL_PIN_REG_RDSEL,
+        PINCTRL_PIN_REG_DRV,
         PINCTRL_PIN_REG_MAX,
 };
 
@@ -130,6 +131,8 @@ struct mtk_pin_desc {
         u8 drv_n;
 };
 
+struct mtk_pinctrl;
+
 /* struct mtk_pin_soc - the structure that holds SoC-specific data */
 struct mtk_pin_soc {
         const struct mtk_pin_reg_calc   *reg_cal;
@@ -145,6 +148,12 @@ struct mtk_pin_soc {
         /* Specific parameters per SoC */
         u8                              gpio_m;
         u8                              eint_m;
+
+        /* Specific pinconfig operations */
+        int (*drive_set)(struct mtk_pinctrl *hw,
+                         const struct mtk_pin_desc *desc, u32 arg);
+        int (*drive_get)(struct mtk_pinctrl *hw,
+                         const struct mtk_pin_desc *desc, int *val);
 };
 
 struct mtk_pinctrl {
@@ -161,4 +170,9 @@ void mtk_rmw(struct mtk_pinctrl *pctl, u32 reg, u32 mask, u32 set);
 int mtk_hw_set_value(struct mtk_pinctrl *hw, int pin, int field, int value);
 int mtk_hw_get_value(struct mtk_pinctrl *hw, int pin, int field, int *value);
 
+int mtk_pinconf_drive_set(struct mtk_pinctrl *hw,
+                          const struct mtk_pin_desc *desc, u32 arg);
+int mtk_pinconf_drive_get(struct mtk_pinctrl *hw,
+                          const struct mtk_pin_desc *desc, int *val);
+
 #endif /* __PINCTRL_MTK_COMMON_V2_H */