Initial import

1 files changed, 419 insertions, 0 deletions

diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c
new file mode 100644
index 000000000..ba353735e
--- /dev/null
+++ b/drivers/pinctrl/sh-pfc/gpio.c
@@ -0,0 +1,419 @@
+/*
+ * SuperH Pin Function Controller GPIO driver.
+ *
+ * Copyright (C) 2008 Magnus Damm
+ * Copyright (C) 2009 - 2012 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "core.h"
+
+struct sh_pfc_gpio_data_reg {
+	const struct pinmux_data_reg *info;
+	u32 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_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)
+{
+	return container_of(gc, struct sh_pfc_chip, gpio_chip);
+}
+
+static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
+{
+	return gpio_to_pfc_chip(gc)->pfc;
+}
+
+static void gpio_get_data_reg(struct sh_pfc_chip *chip, unsigned int offset,
+			      struct sh_pfc_gpio_data_reg **reg,
+			      unsigned int *bit)
+{
+	int idx = sh_pfc_get_pin_index(chip->pfc, offset);
+	struct sh_pfc_gpio_pin *gpio_pin = &chip->pins[idx];
+
+	*reg = &chip->regs[gpio_pin->dreg];
+	*bit = gpio_pin->dbit;
+}
+
+static u32 gpio_read_data_reg(struct sh_pfc_chip *chip,
+			      const struct pinmux_data_reg *dreg)
+{
+	phys_addr_t address = dreg->reg;
+	void __iomem *mem = address - chip->mem->phys + chip->mem->virt;
+
+	return sh_pfc_read_raw_reg(mem, dreg->reg_width);
+}
+
+static void gpio_write_data_reg(struct sh_pfc_chip *chip,
+				const struct pinmux_data_reg *dreg, u32 value)
+{
+	phys_addr_t address = dreg->reg;
+	void __iomem *mem = address - chip->mem->phys + chip->mem->virt;
+
+	sh_pfc_write_raw_reg(mem, dreg->reg_width, value);
+}
+
+static void gpio_setup_data_reg(struct sh_pfc_chip *chip, unsigned idx)
+{
+	struct sh_pfc *pfc = chip->pfc;
+	struct sh_pfc_gpio_pin *gpio_pin = &chip->pins[idx];
+	const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
+	const struct pinmux_data_reg *dreg;
+	unsigned int bit;
+	unsigned int i;
+
+	for (i = 0, dreg = pfc->info->data_regs; dreg->reg_width; ++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;
+			}
+		}
+	}
+
+	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 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 int bit;
+	unsigned int pos;
+
+	gpio_get_data_reg(chip, offset, &reg, &bit);
+
+	pos = reg->info->reg_width - (bit + 1);
+
+	if (value)
+		reg->shadow |= BIT(pos);
+	else
+		reg->shadow &= ~BIT(pos);
+
+	gpio_write_data_reg(chip, reg->info, reg->shadow);
+}
+
+static int gpio_pin_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+	return pinctrl_gpio_direction_input(offset);
+}
+
+static int gpio_pin_direction_output(struct gpio_chip *gc, unsigned offset,
+				    int value)
+{
+	gpio_pin_set_value(gpio_to_pfc_chip(gc), offset, value);
+
+	return pinctrl_gpio_direction_output(offset);
+}
+
+static int gpio_pin_get(struct gpio_chip *gc, unsigned offset)
+{
+	struct sh_pfc_chip *chip = gpio_to_pfc_chip(gc);
+	struct sh_pfc_gpio_data_reg *reg;
+	unsigned int bit;
+	unsigned int pos;
+
+	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 gpio_pin_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+	gpio_pin_set_value(gpio_to_pfc_chip(gc), offset, value);
+}
+
+static int gpio_pin_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+	struct sh_pfc *pfc = gpio_to_pfc(gc);
+	unsigned int i, k;
+
+	for (i = 0; i < pfc->info->gpio_irq_size; i++) {
+		const short *gpios = pfc->info->gpio_irq[i].gpios;
+
+		for (k = 0; gpios[k] >= 0; k++) {
+			if (gpios[k] == offset)
+				goto found;
+		}
+	}
+
+	return -ENOSYS;
+
+found:
+	if (pfc->num_irqs)
+		return pfc->irqs[i];
+	else
+		return pfc->info->gpio_irq[i].irq;
+}
+
+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->info->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->label = pfc->info->name;
+	gc->dev = pfc->dev;
+	gc->owner = THIS_MODULE;
+	gc->base = 0;
+	gc->ngpio = pfc->nr_gpio_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;
+
+	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->nr_gpio_pins;
+	gc->ngpio = pfc->info->nr_func_gpios;
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * 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 ERR_PTR(-ENOMEM);
+
+	chip->mem = mem;
+	chip->pfc = pfc;
+
+	ret = setup(chip);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	ret = gpiochip_add(&chip->gpio_chip);
+	if (unlikely(ret < 0))
+		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)
+{
+	struct sh_pfc_chip *chip;
+	phys_addr_t address;
+	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.
+	 */
+	address = pfc->info->data_regs[0].reg;
+	for (i = 0; i < pfc->num_windows; ++i) {
+		struct sh_pfc_window *window = &pfc->windows[i];
+
+		if (address >= window->phys &&
+		    address < window->phys + window->size)
+			break;
+	}
+
+	if (i == pfc->num_windows)
+		return 0;
+
+	/* If we have IRQ resources make sure their number is correct. */
+	if (pfc->num_irqs && pfc->num_irqs != pfc->info->gpio_irq_size) {
+		dev_err(pfc->dev, "invalid number of IRQ resources\n");
+		return -EINVAL;
+	}
+
+	/* Register the real GPIOs chip. */
+	chip = sh_pfc_add_gpiochip(pfc, gpio_pin_setup, &pfc->windows[i]);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+
+	pfc->gpio = chip;
+
+	/* Register the GPIO to pin mappings. As pins with GPIO ports must come
+	 * first in the ranges, skip the pins without GPIO ports by stopping at
+	 * the first range that contains such a pin.
+	 */
+	for (i = 0; i < pfc->nr_ranges; ++i) {
+		const struct sh_pfc_pin_range *range = &pfc->ranges[i];
+
+		if (range->start >= pfc->nr_gpio_pins)
+			break;
+
+		ret = gpiochip_add_pin_range(&chip->gpio_chip,
+					     dev_name(pfc->dev),
+					     range->start, range->start,
+					     range->end - range->start + 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)
+{
+	gpiochip_remove(&pfc->gpio->gpio_chip);
+	gpiochip_remove(&pfc->func->gpio_chip);
+
+	return 0;
+}