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path: root/drivers/pinctrl/sh-pfc/gpio.c
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Diffstat (limited to 'drivers/pinctrl/sh-pfc/gpio.c')
-rw-r--r--drivers/pinctrl/sh-pfc/gpio.c419
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;
+}