pinctrl: samsung: Split pin bank description into two structures

This patch splits pin bank description into two structures, one
describing bank type (currently only bitfield widths), which can be
shared across multiple banks and second containing bank-specific
parameters including a pointer to a bank type struct.

It is a prerequisite for further patch removing the statically hardcoded
register offsets, making it impossible to support SoCs with different
set and order of pin control registers.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-exynos.c

@@ -34,6 +34,15 @@
 #include "pinctrl-samsung.h"
 #include "pinctrl-exynos.h"
 
+
+static struct samsung_pin_bank_type bank_type_off = {
+	.fld_width = { 4, 1, 2, 2, 2, 2, },
+};
+
+static struct samsung_pin_bank_type bank_type_alive = {
+	.fld_width = { 4, 1, 2, 2, },
+};
+
 /* list of external wakeup controllers supported */
 static const struct of_device_id exynos_wkup_irq_ids[] = {
 	{ .compatible = "samsung,exynos4210-wakeup-eint", },
@@ -76,6 +85,7 @@ static void exynos_gpio_irq_ack(struct irq_data *irqd)
 static int exynos_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
 {
 	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;
 	struct samsung_pin_ctrl *ctrl = d->ctrl;
 	unsigned int pin = irqd->hwirq;
@@ -117,8 +127,8 @@ static int exynos_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
 	writel(con, d->virt_base + reg_con);
 
 	reg_con = bank->pctl_offset;
-	shift = pin * bank->func_width;
-	mask = (1 << bank->func_width) - 1;
+	shift = pin * bank_type->fld_width[PINCFG_TYPE_FUNC];
+	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
 
 	spin_lock_irqsave(&bank->slock, flags);
 
@@ -259,6 +269,7 @@ static void exynos_wkup_irq_ack(struct irq_data *irqd)
 static int exynos_wkup_irq_set_type(struct irq_data *irqd, unsigned int type)
 {
 	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 long reg_con = d->ctrl->weint_con + bank->eint_offset;
@@ -299,8 +310,8 @@ static int exynos_wkup_irq_set_type(struct irq_data *irqd, unsigned int type)
 	writel(con, d->virt_base + reg_con);
 
 	reg_con = bank->pctl_offset;
-	shift = pin * bank->func_width;
-	mask = (1 << bank->func_width) - 1;
+	shift = pin * bank_type->fld_width[PINCFG_TYPE_FUNC];
+	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
 
 	spin_lock_irqsave(&bank->slock, flags);
 

drivers/pinctrl/pinctrl-exynos.h

@@ -48,26 +48,18 @@
 
 #define EXYNOS_PIN_BANK_EINTN(pins, reg, id)		\
 	{						\
+		.type		= &bank_type_off,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
-		.func_width	= 4,			\
-		.pud_width	= 2,			\
-		.drv_width	= 2,			\
-		.conpdn_width	= 2,			\
-		.pudpdn_width	= 2,			\
 		.eint_type	= EINT_TYPE_NONE,	\
 		.name		= id			\
 	}
 
 #define EXYNOS_PIN_BANK_EINTG(pins, reg, id, offs)	\
 	{						\
+		.type		= &bank_type_off,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
-		.func_width	= 4,			\
-		.pud_width	= 2,			\
-		.drv_width	= 2,			\
-		.conpdn_width	= 2,			\
-		.pudpdn_width	= 2,			\
 		.eint_type	= EINT_TYPE_GPIO,	\
 		.eint_offset	= offs,			\
 		.name		= id			\
@@ -75,11 +67,9 @@
 
 #define EXYNOS_PIN_BANK_EINTW(pins, reg, id, offs)	\
 	{						\
+		.type		= &bank_type_alive,	\
 		.pctl_offset	= reg,			\
 		.nr_pins	= pins,			\
-		.func_width	= 4,			\
-		.pud_width	= 2,			\
-		.drv_width	= 2,			\
 		.eint_type	= EINT_TYPE_WKUP,	\
 		.eint_offset	= offs,			\
 		.name		= id			\

drivers/pinctrl/pinctrl-samsung.c

@@ -300,10 +300,13 @@ static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
 	 * pin function number in the config register.
 	 */
 	for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++) {
+		struct samsung_pin_bank_type *type;
+
 		pin_to_reg_bank(drvdata, pins[cnt] - drvdata->ctrl->base,
 				&reg, &pin_offset, &bank);
-		mask = (1 << bank->func_width) - 1;
-		shift = pin_offset * bank->func_width;
+		type = bank->type;
+		mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
+		shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
 
 		spin_lock_irqsave(&bank->slock, flags);
 
@@ -340,6 +343,7 @@ static void samsung_pinmux_disable(struct pinctrl_dev *pctldev,
 static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
 		struct pinctrl_gpio_range *range, unsigned offset, bool input)
 {
+	struct samsung_pin_bank_type *type;
 	struct samsung_pin_bank *bank;
 	struct samsung_pinctrl_drv_data *drvdata;
 	void __iomem *reg;
@@ -347,13 +351,14 @@ static int samsung_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
 	unsigned long flags;
 
 	bank = gc_to_pin_bank(range->gc);
+	type = bank->type;
 	drvdata = pinctrl_dev_get_drvdata(pctldev);
 
 	pin_offset = offset - bank->pin_base;
 	reg = drvdata->virt_base + bank->pctl_offset;
 
-	mask = (1 << bank->func_width) - 1;
-	shift = pin_offset * bank->func_width;
+	mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
+	shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
 
 	spin_lock_irqsave(&bank->slock, flags);
 
@@ -383,6 +388,7 @@ static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 				unsigned long *config, bool set)
 {
 	struct samsung_pinctrl_drv_data *drvdata;
+	struct samsung_pin_bank_type *type;
 	struct samsung_pin_bank *bank;
 	void __iomem *reg_base;
 	enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
@@ -393,22 +399,19 @@ static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 	drvdata = pinctrl_dev_get_drvdata(pctldev);
 	pin_to_reg_bank(drvdata, pin - drvdata->ctrl->base, &reg_base,
 					&pin_offset, &bank);
+	type = bank->type;
 
 	switch (cfg_type) {
 	case PINCFG_TYPE_PUD:
-		width = bank->pud_width;
 		cfg_reg = PUD_REG;
 		break;
 	case PINCFG_TYPE_DRV:
-		width = bank->drv_width;
 		cfg_reg = DRV_REG;
 		break;
 	case PINCFG_TYPE_CON_PDN:
-		width = bank->conpdn_width;
 		cfg_reg = CONPDN_REG;
 		break;
 	case PINCFG_TYPE_PUD_PDN:
-		width = bank->pudpdn_width;
 		cfg_reg = PUDPDN_REG;
 		break;
 	default:
@@ -416,9 +419,11 @@ static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 		return -EINVAL;
 	}
 
-	if (!width)
+	if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
 		return -EINVAL;
 
+	width = type->fld_width[cfg_type];
+
 	spin_lock_irqsave(&bank->slock, flags);
 
 	mask = (1 << width) - 1;
@@ -497,6 +502,7 @@ static const struct pinconf_ops samsung_pinconf_ops = {
 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 {
 	struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
+	struct samsung_pin_bank_type *type = bank->type;
 	unsigned long flags;
 	void __iomem *reg;
 	u32 data;

drivers/pinctrl/pinctrl-samsung.h

@@ -37,16 +37,22 @@
 
 /**
  * enum pincfg_type - possible pin configuration types supported.
+ * @PINCFG_TYPE_FUNC: Function configuration.
+ * @PINCFG_TYPE_DAT: Pin value configuration.
  * @PINCFG_TYPE_PUD: Pull up/down configuration.
  * @PINCFG_TYPE_DRV: Drive strength configuration.
  * @PINCFG_TYPE_CON_PDN: Pin function in power down mode.
  * @PINCFG_TYPE_PUD_PDN: Pull up/down configuration in power down mode.
  */
 enum pincfg_type {
+	PINCFG_TYPE_FUNC,
+	PINCFG_TYPE_DAT,
 	PINCFG_TYPE_PUD,
 	PINCFG_TYPE_DRV,
 	PINCFG_TYPE_CON_PDN,
 	PINCFG_TYPE_PUD_PDN,
+
+	PINCFG_TYPE_NUM
 };
 
 /*
@@ -102,16 +108,20 @@ enum eint_type {
 
 struct samsung_pinctrl_drv_data;
 
+/**
+ * struct samsung_pin_bank_type: pin bank type description
+ * @fld_width: widths of configuration bitfields (0 if unavailable)
+ */
+struct samsung_pin_bank_type {
+	u8 fld_width[PINCFG_TYPE_NUM];
+};
+
 /**
  * struct samsung_pin_bank: represent a controller pin-bank.
+ * @type: type of the bank (register offsets and bitfield widths)
  * @pctl_offset: starting offset of the pin-bank registers.
  * @pin_base: starting pin number of the bank.
  * @nr_pins: number of pins included in this bank.
- * @func_width: width of the function selector bit field.
- * @pud_width: width of the pin pull up/down selector bit field.
- * @drv_width: width of the pin driver strength selector bit field.
- * @conpdn_width: width of the sleep mode function selector bin field.
- * @pudpdn_width: width of the sleep mode pull up/down selector bit field.
  * @eint_type: type of the external interrupt supported by the bank.
  * @name: name to be prefixed for each pin in this pin bank.
  * @of_node: OF node of the bank.
@@ -122,14 +132,10 @@ struct samsung_pinctrl_drv_data;
  * @slock: spinlock protecting bank registers
  */
 struct samsung_pin_bank {
+	struct samsung_pin_bank_type *type;
 	u32		pctl_offset;
 	u32		pin_base;
 	u8		nr_pins;
-	u8		func_width;
-	u8		pud_width;
-	u8		drv_width;
-	u8		conpdn_width;
-	u8		pudpdn_width;
 	enum eint_type	eint_type;
 	u32		eint_offset;
 	char		*name;