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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020 Broadcom
- */
- #include <common.h>
- #include <errno.h>
- #include <asm/gpio.h>
- #include <asm/io.h>
- #include <dm.h>
- #include <dm/device_compat.h>
- #include <dm/devres.h>
- #include <dm/pinctrl.h>
- /*
- * There are five GPIO bank register. Each bank can configure max of 32 gpios.
- * BANK0 - gpios 0 to 31
- * BANK1 - gpios 32 to 63
- * BANK2 - gpios 64 to 95
- * BANK3 - gpios 96 to 127
- * BANK4 - gpios 128 to 150
- *
- * Offset difference between consecutive bank register is 0x200
- */
- #define NGPIO_PER_BANK 32
- #define GPIO_BANK_SIZE 0x200
- #define GPIO_BANK(pin) ((pin) / NGPIO_PER_BANK)
- #define GPIO_SHIFT(pin) ((pin) % NGPIO_PER_BANK)
- #define GPIO_REG(pin, reg) (GPIO_BANK_SIZE * GPIO_BANK(pin) + (reg))
- /* device register offset */
- #define DATA_IN_OFFSET 0x00
- #define DATA_OUT_OFFSET 0x04
- #define OUT_EN_OFFSET 0x08
- /**
- * struct iproc_gpio_pctrl_map - gpio and pinctrl mapping
- * @gpio_pin: start of gpio number in gpio-ranges
- * @pctrl_pin: start of pinctrl number in gpio-ranges
- * @npins: total number of pins in gpio-ranges
- * @node: list node
- */
- struct iproc_gpio_pctrl_map {
- u32 gpio_pin;
- u32 pctrl_pin;
- u32 npins;
- struct list_head node;
- };
- /**
- * struct iproc_gpio_pctrl_map - gpio device instance
- * @pinctrl_dev:pointer to pinctrl device
- * @gpiomap: list node having mapping between gpio and pinctrl
- * @base: I/O register base address of gpio device
- * @name: gpio device name, ex GPIO0, GPIO1
- * @ngpios: total number of gpios
- */
- struct iproc_gpio_platdata {
- struct udevice *pinctrl_dev;
- struct list_head gpiomap;
- void __iomem *base;
- char *name;
- u32 ngpios;
- };
- /**
- * iproc_gpio_set_bit - set or clear one bit in an iproc GPIO register.
- *
- * The bit relates to a GPIO pin.
- *
- * @plat: iproc GPIO device
- * @reg: register offset
- * @gpio: GPIO pin
- * @set: set or clear
- */
- static inline void iproc_gpio_set_bit(struct iproc_gpio_platdata *plat,
- u32 reg, u32 gpio, bool set)
- {
- u32 offset = GPIO_REG(gpio, reg);
- u32 shift = GPIO_SHIFT(gpio);
- clrsetbits_le32(plat->base + offset, BIT(shift),
- (set ? BIT(shift) : 0));
- }
- static inline bool iproc_gpio_get_bit(struct iproc_gpio_platdata *plat,
- u32 reg, u32 gpio)
- {
- u32 offset = GPIO_REG(gpio, reg);
- u32 shift = GPIO_SHIFT(gpio);
- return readl(plat->base + offset) & BIT(shift);
- }
- /**
- * iproc_get_gpio_pctrl_mapping() - get associated pinctrl pin from gpio pin
- *
- * @plat: iproc GPIO device
- * @gpio: GPIO pin
- */
- static u32 iproc_get_pctrl_from_gpio(struct iproc_gpio_platdata *plat, u32 gpio)
- {
- struct iproc_gpio_pctrl_map *range = NULL;
- struct list_head *pos, *tmp;
- u32 ret = 0;
- list_for_each_safe(pos, tmp, &plat->gpiomap) {
- range = list_entry(pos, struct iproc_gpio_pctrl_map, node);
- if (gpio == range->gpio_pin ||
- gpio < (range->gpio_pin + range->npins)) {
- ret = range->pctrl_pin + (gpio - range->gpio_pin);
- break;
- }
- }
- return ret;
- }
- /**
- * iproc_get_gpio_pctrl_mapping() - get mapping between gpio and pinctrl
- *
- * Read dt node "gpio-ranges" to get gpio and pinctrl mapping and store
- * in private data structure to use it later while enabling gpio.
- *
- * @dev: pointer to GPIO device
- * @return 0 on success and -ENOMEM on failure
- */
- static int iproc_get_gpio_pctrl_mapping(struct udevice *dev)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- struct iproc_gpio_pctrl_map *range = NULL;
- struct ofnode_phandle_args args;
- int index = 0, ret;
- for (;; index++) {
- ret = dev_read_phandle_with_args(dev, "gpio-ranges",
- NULL, 3, index, &args);
- if (ret)
- break;
- range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
- if (!range)
- return -ENOMEM;
- range->gpio_pin = args.args[0];
- range->pctrl_pin = args.args[1];
- range->npins = args.args[2];
- list_add_tail(&range->node, &plat->gpiomap);
- }
- return 0;
- }
- static int iproc_gpio_request(struct udevice *dev, u32 gpio, const char *label)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- u32 pctrl;
- /* nothing to do if there is no corresponding pinctrl device */
- if (!plat->pinctrl_dev)
- return 0;
- pctrl = iproc_get_pctrl_from_gpio(plat, gpio);
- return pinctrl_request(plat->pinctrl_dev, pctrl, 0);
- }
- static int iproc_gpio_direction_input(struct udevice *dev, u32 gpio)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- iproc_gpio_set_bit(plat, OUT_EN_OFFSET, gpio, false);
- dev_dbg(dev, "gpio:%u set input\n", gpio);
- return 0;
- }
- static int iproc_gpio_direction_output(struct udevice *dev, u32 gpio, int value)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- iproc_gpio_set_bit(plat, OUT_EN_OFFSET, gpio, true);
- iproc_gpio_set_bit(plat, DATA_OUT_OFFSET, gpio, value);
- dev_dbg(dev, "gpio:%u set output, value:%d\n", gpio, value);
- return 0;
- }
- static int iproc_gpio_get_value(struct udevice *dev, u32 gpio)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- int value;
- value = iproc_gpio_get_bit(plat, DATA_IN_OFFSET, gpio);
- dev_dbg(dev, "gpio:%u get, value:%d\n", gpio, value);
- return value;
- }
- static int iproc_gpio_set_value(struct udevice *dev, u32 gpio, int value)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- if (iproc_gpio_get_bit(plat, OUT_EN_OFFSET, gpio))
- iproc_gpio_set_bit(plat, DATA_OUT_OFFSET, gpio, value);
- dev_dbg(dev, "gpio:%u set, value:%d\n", gpio, value);
- return 0;
- }
- static int iproc_gpio_get_function(struct udevice *dev, u32 gpio)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- if (iproc_gpio_get_bit(plat, OUT_EN_OFFSET, gpio))
- return GPIOF_OUTPUT;
- else
- return GPIOF_INPUT;
- }
- static int iproc_gpio_ofdata_to_platdata(struct udevice *dev)
- {
- struct iproc_gpio_platdata *plat = dev_get_platdata(dev);
- struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- int ret;
- char name[10];
- plat->base = dev_read_addr_ptr(dev);
- if (!plat->base) {
- debug("%s: Failed to get base address\n", __func__);
- return -EINVAL;
- }
- ret = dev_read_u32(dev, "ngpios", &plat->ngpios);
- if (ret < 0) {
- dev_err(dev, "%s: Failed to get ngpios\n", __func__);
- return ret;
- }
- uclass_get_device_by_phandle(UCLASS_PINCTRL, dev, "gpio-ranges",
- &plat->pinctrl_dev);
- if (ret < 0) {
- dev_err(dev, "%s: Failed to get pinctrl phandle\n", __func__);
- return ret;
- }
- INIT_LIST_HEAD(&plat->gpiomap);
- ret = iproc_get_gpio_pctrl_mapping(dev);
- if (ret < 0) {
- dev_err(dev, "%s: Failed to get gpio to pctrl map ret(%d)\n",
- __func__, ret);
- return ret;
- }
- snprintf(name, sizeof(name), "GPIO%d", dev->req_seq);
- plat->name = strdup(name);
- if (!plat->name)
- return -ENOMEM;
- uc_priv->gpio_count = plat->ngpios;
- uc_priv->bank_name = plat->name;
- dev_info(dev, ":bank name(%s) base %p, #gpios %d\n",
- plat->name, plat->base, plat->ngpios);
- return 0;
- }
- static const struct dm_gpio_ops iproc_gpio_ops = {
- .request = iproc_gpio_request,
- .direction_input = iproc_gpio_direction_input,
- .direction_output = iproc_gpio_direction_output,
- .get_value = iproc_gpio_get_value,
- .set_value = iproc_gpio_set_value,
- .get_function = iproc_gpio_get_function,
- };
- static const struct udevice_id iproc_gpio_ids[] = {
- { .compatible = "brcm,iproc-gpio" },
- { }
- };
- U_BOOT_DRIVER(iproc_gpio) = {
- .name = "iproc_gpio",
- .id = UCLASS_GPIO,
- .of_match = iproc_gpio_ids,
- .ops = &iproc_gpio_ops,
- .ofdata_to_platdata = iproc_gpio_ofdata_to_platdata,
- .platdata_auto_alloc_size = sizeof(struct iproc_gpio_platdata),
- };
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