u-boot/drivers/gpio/iproc_gpio.c
Rayagonda Kokatanur a7090b42af drivers: gpio: add broadcom iproc gpio driver support
Add gpio driver support for Broadcom iproc-based socs.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Signed-off-by: Sheetal Tigadoli <sheetal.tigadoli@broadcom.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-07-29 10:37:11 -04:00

290 lines
7.3 KiB
C

// 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),
};