1 files changed, 304 insertions, 68 deletions

diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c
index a535075c8b6..d37efa7dcf9 100644
--- a/drivers/pinctrl/sh-pfc/gpio.c
+++ b/drivers/pinctrl/sh-pfc/gpio.c
@@ -9,8 +9,6 @@
  * for more details.
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME " gpio: " fmt
-
 #include <linux/device.h>
 #include <linux/gpio.h>
 #include <linux/init.h>
@@ -21,9 +19,23 @@
 
 #include "core.h"
 
+struct sh_pfc_gpio_data_reg {
+	const struct pinmux_data_reg *info;
+	unsigned long shadow;
+};
+
+struct sh_pfc_gpio_pin {
+	u8 dbit;
+	u8 dreg;
+};
+
 struct sh_pfc_chip {
-	struct sh_pfc		*pfc;
-	struct gpio_chip	gpio_chip;
+	struct sh_pfc			*pfc;
+	struct gpio_chip		gpio_chip;
+
+	struct sh_pfc_window		*mem;
+	struct sh_pfc_gpio_data_reg	*regs;
+	struct sh_pfc_gpio_pin		*pins;
 };
 
 static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc)
@@ -36,143 +48,367 @@ static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
 	return gpio_to_pfc_chip(gc)->pfc;
 }
 
-static int sh_gpio_request(struct gpio_chip *gc, unsigned offset)
+static void gpio_get_data_reg(struct sh_pfc_chip *chip, unsigned int gpio,
+			      struct sh_pfc_gpio_data_reg **reg,
+			      unsigned int *bit)
 {
-	return pinctrl_request_gpio(offset);
+	int idx = sh_pfc_get_pin_index(chip->pfc, gpio);
+	struct sh_pfc_gpio_pin *gpio_pin = &chip->pins[idx];
+
+	*reg = &chip->regs[gpio_pin->dreg];
+	*bit = gpio_pin->dbit;
 }
 
-static void sh_gpio_free(struct gpio_chip *gc, unsigned offset)
+static unsigned long gpio_read_data_reg(struct sh_pfc_chip *chip,
+					const struct pinmux_data_reg *dreg)
 {
-	pinctrl_free_gpio(offset);
+	void __iomem *mem = dreg->reg - chip->mem->phys + chip->mem->virt;
+
+	return sh_pfc_read_raw_reg(mem, dreg->reg_width);
 }
 
-static void sh_gpio_set_value(struct sh_pfc *pfc, unsigned gpio, int value)
+static void gpio_write_data_reg(struct sh_pfc_chip *chip,
+				const struct pinmux_data_reg *dreg,
+				unsigned long value)
 {
-	struct pinmux_data_reg *dr = NULL;
-	int bit = 0;
+	void __iomem *mem = dreg->reg - chip->mem->phys + chip->mem->virt;
 
-	if (sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
-		BUG();
-	else
-		sh_pfc_write_bit(dr, bit, value);
+	sh_pfc_write_raw_reg(mem, dreg->reg_width, value);
 }
 
-static int sh_gpio_get_value(struct sh_pfc *pfc, unsigned gpio)
+static void gpio_setup_data_reg(struct sh_pfc_chip *chip, unsigned gpio)
 {
-	struct pinmux_data_reg *dr = NULL;
-	int bit = 0;
+	struct sh_pfc *pfc = chip->pfc;
+	struct sh_pfc_gpio_pin *gpio_pin = &chip->pins[gpio];
+	const struct sh_pfc_pin *pin = &pfc->info->pins[gpio];
+	const struct pinmux_data_reg *dreg;
+	unsigned int bit;
+	unsigned int i;
+
+	for (i = 0, dreg = pfc->info->data_regs; dreg->reg; ++i, ++dreg) {
+		for (bit = 0; bit < dreg->reg_width; bit++) {
+			if (dreg->enum_ids[bit] == pin->enum_id) {
+				gpio_pin->dreg = i;
+				gpio_pin->dbit = bit;
+				return;
+			}
+		}
+	}
 
-	if (sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
+	BUG();
+}
+
+static int gpio_setup_data_regs(struct sh_pfc_chip *chip)
+{
+	struct sh_pfc *pfc = chip->pfc;
+	const struct pinmux_data_reg *dreg;
+	unsigned int i;
+
+	/* Count the number of data registers, allocate memory and initialize
+	 * them.
+	 */
+	for (i = 0; pfc->info->data_regs[i].reg_width; ++i)
+		;
+
+	chip->regs = devm_kzalloc(pfc->dev, i * sizeof(*chip->regs),
+				  GFP_KERNEL);
+	if (chip->regs == NULL)
+		return -ENOMEM;
+
+	for (i = 0, dreg = pfc->info->data_regs; dreg->reg_width; ++i, ++dreg) {
+		chip->regs[i].info = dreg;
+		chip->regs[i].shadow = gpio_read_data_reg(chip, dreg);
+	}
+
+	for (i = 0; i < pfc->info->nr_pins; i++) {
+		if (pfc->info->pins[i].enum_id == 0)
+			continue;
+
+		gpio_setup_data_reg(chip, i);
+	}
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Pin GPIOs
+ */
+
+static int gpio_pin_request(struct gpio_chip *gc, unsigned offset)
+{
+	struct sh_pfc *pfc = gpio_to_pfc(gc);
+	int idx = sh_pfc_get_pin_index(pfc, offset);
+
+	if (idx < 0 || pfc->info->pins[idx].enum_id == 0)
 		return -EINVAL;
 
-	return sh_pfc_read_bit(dr, bit);
+	return pinctrl_request_gpio(offset);
+}
+
+static void gpio_pin_free(struct gpio_chip *gc, unsigned offset)
+{
+	return pinctrl_free_gpio(offset);
+}
+
+static void gpio_pin_set_value(struct sh_pfc_chip *chip, unsigned offset,
+			       int value)
+{
+	struct sh_pfc_gpio_data_reg *reg;
+	unsigned long pos;
+	unsigned int bit;
+
+	gpio_get_data_reg(chip, offset, &reg, &bit);
+
+	pos = reg->info->reg_width - (bit + 1);
+
+	if (value)
+		set_bit(pos, &reg->shadow);
+	else
+		clear_bit(pos, &reg->shadow);
+
+	gpio_write_data_reg(chip, reg->info, reg->shadow);
 }
 
-static int sh_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+static int gpio_pin_direction_input(struct gpio_chip *gc, unsigned offset)
 {
 	return pinctrl_gpio_direction_input(offset);
 }
 
-static int sh_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
+static int gpio_pin_direction_output(struct gpio_chip *gc, unsigned offset,
 				    int value)
 {
-	sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
+	gpio_pin_set_value(gpio_to_pfc_chip(gc), offset, value);
 
 	return pinctrl_gpio_direction_output(offset);
 }
 
-static int sh_gpio_get(struct gpio_chip *gc, unsigned offset)
+static int gpio_pin_get(struct gpio_chip *gc, unsigned offset)
 {
-	return sh_gpio_get_value(gpio_to_pfc(gc), offset);
+	struct sh_pfc_chip *chip = gpio_to_pfc_chip(gc);
+	struct sh_pfc_gpio_data_reg *reg;
+	unsigned long pos;
+	unsigned int bit;
+
+	gpio_get_data_reg(chip, offset, &reg, &bit);
+
+	pos = reg->info->reg_width - (bit + 1);
+
+	return (gpio_read_data_reg(chip, reg->info) >> pos) & 1;
 }
 
-static void sh_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
+static void gpio_pin_set(struct gpio_chip *gc, unsigned offset, int value)
 {
-	sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
+	gpio_pin_set_value(gpio_to_pfc_chip(gc), offset, value);
 }
 
-static int sh_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+static int gpio_pin_to_irq(struct gpio_chip *gc, unsigned offset)
 {
 	struct sh_pfc *pfc = gpio_to_pfc(gc);
-	pinmux_enum_t enum_id;
-	pinmux_enum_t *enum_ids;
-	int i, k, pos;
-
-	pos = 0;
-	enum_id = 0;
-	while (1) {
-		pos = sh_pfc_gpio_to_enum(pfc, offset, pos, &enum_id);
-		if (pos <= 0 || !enum_id)
-			break;
+	int i, k;
 
-		for (i = 0; i < pfc->info->gpio_irq_size; i++) {
-			enum_ids = pfc->info->gpio_irq[i].enum_ids;
-			for (k = 0; enum_ids[k]; k++) {
-				if (enum_ids[k] == enum_id)
-					return pfc->info->gpio_irq[i].irq;
-			}
+	for (i = 0; i < pfc->info->gpio_irq_size; i++) {
+		unsigned short *gpios = pfc->info->gpio_irq[i].gpios;
+
+		for (k = 0; gpios[k]; k++) {
+			if (gpios[k] == offset)
+				return pfc->info->gpio_irq[i].irq;
 		}
 	}
 
 	return -ENOSYS;
 }
 
-static void sh_pfc_gpio_setup(struct sh_pfc_chip *chip)
+static int gpio_pin_setup(struct sh_pfc_chip *chip)
 {
 	struct sh_pfc *pfc = chip->pfc;
 	struct gpio_chip *gc = &chip->gpio_chip;
+	int ret;
+
+	chip->pins = devm_kzalloc(pfc->dev, pfc->nr_pins * sizeof(*chip->pins),
+				  GFP_KERNEL);
+	if (chip->pins == NULL)
+		return -ENOMEM;
+
+	ret = gpio_setup_data_regs(chip);
+	if (ret < 0)
+		return ret;
+
+	gc->request = gpio_pin_request;
+	gc->free = gpio_pin_free;
+	gc->direction_input = gpio_pin_direction_input;
+	gc->get = gpio_pin_get;
+	gc->direction_output = gpio_pin_direction_output;
+	gc->set = gpio_pin_set;
+	gc->to_irq = gpio_pin_to_irq;
 
-	gc->request = sh_gpio_request;
-	gc->free = sh_gpio_free;
-	gc->direction_input = sh_gpio_direction_input;
-	gc->get = sh_gpio_get;
-	gc->direction_output = sh_gpio_direction_output;
-	gc->set = sh_gpio_set;
-	gc->to_irq = sh_gpio_to_irq;
+	gc->label = pfc->info->name;
+	gc->dev = pfc->dev;
+	gc->owner = THIS_MODULE;
+	gc->base = 0;
+	gc->ngpio = pfc->nr_pins;
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Function GPIOs
+ */
+
+static int gpio_function_request(struct gpio_chip *gc, unsigned offset)
+{
+	static bool __print_once;
+	struct sh_pfc *pfc = gpio_to_pfc(gc);
+	unsigned int mark = pfc->info->func_gpios[offset].enum_id;
+	unsigned long flags;
+	int ret;
+
+	if (!__print_once) {
+		dev_notice(pfc->dev,
+			   "Use of GPIO API for function requests is deprecated."
+			   " Convert to pinctrl\n");
+		__print_once = true;
+	}
+
+	if (mark == 0)
+		return -EINVAL;
 
-	WARN_ON(pfc->info->first_gpio != 0); /* needs testing */
+	spin_lock_irqsave(&pfc->lock, flags);
+	ret = sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION);
+	spin_unlock_irqrestore(&pfc->lock, flags);
+
+	return ret;
+}
+
+static void gpio_function_free(struct gpio_chip *gc, unsigned offset)
+{
+}
+
+static int gpio_function_setup(struct sh_pfc_chip *chip)
+{
+	struct sh_pfc *pfc = chip->pfc;
+	struct gpio_chip *gc = &chip->gpio_chip;
+
+	gc->request = gpio_function_request;
+	gc->free = gpio_function_free;
 
 	gc->label = pfc->info->name;
 	gc->owner = THIS_MODULE;
-	gc->base = pfc->info->first_gpio;
-	gc->ngpio = (pfc->info->last_gpio - pfc->info->first_gpio) + 1;
+	gc->base = pfc->nr_pins;
+	gc->ngpio = pfc->info->nr_func_gpios;
+
+	return 0;
 }
 
-int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
+/* -----------------------------------------------------------------------------
+ * Register/unregister
+ */
+
+static struct sh_pfc_chip *
+sh_pfc_add_gpiochip(struct sh_pfc *pfc, int(*setup)(struct sh_pfc_chip *),
+		    struct sh_pfc_window *mem)
 {
 	struct sh_pfc_chip *chip;
 	int ret;
 
 	chip = devm_kzalloc(pfc->dev, sizeof(*chip), GFP_KERNEL);
 	if (unlikely(!chip))
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
+	chip->mem = mem;
 	chip->pfc = pfc;
 
-	sh_pfc_gpio_setup(chip);
+	ret = setup(chip);
+	if (ret < 0)
+		return ERR_PTR(ret);
 
 	ret = gpiochip_add(&chip->gpio_chip);
 	if (unlikely(ret < 0))
-		return ret;
+		return ERR_PTR(ret);
+
+	dev_info(pfc->dev, "%s handling gpio %u -> %u\n",
+		 chip->gpio_chip.label, chip->gpio_chip.base,
+		 chip->gpio_chip.base + chip->gpio_chip.ngpio - 1);
+
+	return chip;
+}
+
+int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
+{
+	const struct pinmux_range *ranges;
+	struct pinmux_range def_range;
+	struct sh_pfc_chip *chip;
+	unsigned int nr_ranges;
+	unsigned int i;
+	int ret;
+
+	if (pfc->info->data_regs == NULL)
+		return 0;
+
+	/* Find the memory window that contain the GPIO registers. Boards that
+	 * register a separate GPIO device will not supply a memory resource
+	 * that covers the data registers. In that case don't try to handle
+	 * GPIOs.
+	 */
+	for (i = 0; i < pfc->num_windows; ++i) {
+		struct sh_pfc_window *window = &pfc->window[i];
+
+		if (pfc->info->data_regs[0].reg >= window->phys &&
+		    pfc->info->data_regs[0].reg < window->phys + window->size)
+			break;
+	}
+
+	if (i == pfc->num_windows)
+		return 0;
+
+	/* Register the real GPIOs chip. */
+	chip = sh_pfc_add_gpiochip(pfc, gpio_pin_setup, &pfc->window[i]);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
 
 	pfc->gpio = chip;
 
-	pr_info("%s handling gpio %d -> %d\n",
-		pfc->info->name, pfc->info->first_gpio,
-		pfc->info->last_gpio);
+	/* Register the GPIO to pin mappings. */
+	if (pfc->info->ranges == NULL) {
+		def_range.begin = 0;
+		def_range.end = pfc->info->nr_pins - 1;
+		ranges = &def_range;
+		nr_ranges = 1;
+	} else {
+		ranges = pfc->info->ranges;
+		nr_ranges = pfc->info->nr_ranges;
+	}
+
+	for (i = 0; i < nr_ranges; ++i) {
+		const struct pinmux_range *range = &ranges[i];
+
+		ret = gpiochip_add_pin_range(&chip->gpio_chip,
+					     dev_name(pfc->dev),
+					     range->begin, range->begin,
+					     range->end - range->begin + 1);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* Register the function GPIOs chip. */
+	if (pfc->info->nr_func_gpios == 0)
+		return 0;
+
+	chip = sh_pfc_add_gpiochip(pfc, gpio_function_setup, NULL);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	pfc->func = chip;
 
 	return 0;
 }
 
 int sh_pfc_unregister_gpiochip(struct sh_pfc *pfc)
 {
-	struct sh_pfc_chip *chip = pfc->gpio;
+	int err;
 	int ret;
 
-	ret = gpiochip_remove(&chip->gpio_chip);
-	if (unlikely(ret < 0))
-		return ret;
+	ret = gpiochip_remove(&pfc->gpio->gpio_chip);
+	err = gpiochip_remove(&pfc->func->gpio_chip);
 
-	pfc->gpio = NULL;
-	return 0;
+	return ret < 0 ? ret : err;
 }