u-boot/drivers/gpio/s5p_gpio.c
Simon Glass b8809e60cd dm: exynos: gpio: Convert to driver model
Convert the exynos GPIO driver to driver model. This implements the generic
GPIO interface but not the extra Exynos-specific functions.

Signed-off-by: Simon Glass <sjg@chromium.org>
2014-10-22 10:36:36 -06:00

471 lines
11 KiB
C

/*
* (C) Copyright 2009 Samsung Electronics
* Minkyu Kang <mk7.kang@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <dm/device-internal.h>
DECLARE_GLOBAL_DATA_PTR;
#define S5P_GPIO_GET_PIN(x) (x % GPIO_PER_BANK)
#define CON_MASK(val) (0xf << ((val) << 2))
#define CON_SFR(gpio, cfg) ((cfg) << ((gpio) << 2))
#define CON_SFR_UNSHIFT(val, gpio) ((val) >> ((gpio) << 2))
#define DAT_MASK(gpio) (0x1 << (gpio))
#define DAT_SET(gpio) (0x1 << (gpio))
#define PULL_MASK(gpio) (0x3 << ((gpio) << 1))
#define PULL_MODE(gpio, pull) ((pull) << ((gpio) << 1))
#define DRV_MASK(gpio) (0x3 << ((gpio) << 1))
#define DRV_SET(gpio, mode) ((mode) << ((gpio) << 1))
#define RATE_MASK(gpio) (0x1 << (gpio + 16))
#define RATE_SET(gpio) (0x1 << (gpio + 16))
#define GPIO_NAME_SIZE 20
/* Platform data for each bank */
struct exynos_gpio_platdata {
struct s5p_gpio_bank *bank;
const char *bank_name; /* Name of port, e.g. 'gpa0" */
};
/* Information about each bank at run-time */
struct exynos_bank_info {
char label[GPIO_PER_BANK][GPIO_NAME_SIZE];
struct s5p_gpio_bank *bank;
};
static struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned int gpio)
{
const struct gpio_info *data;
unsigned int upto;
int i, count;
data = get_gpio_data();
count = get_bank_num();
upto = 0;
for (i = 0; i < count; i++) {
debug("i=%d, upto=%d\n", i, upto);
if (gpio < data->max_gpio) {
struct s5p_gpio_bank *bank;
bank = (struct s5p_gpio_bank *)data->reg_addr;
bank += (gpio - upto) / GPIO_PER_BANK;
debug("gpio=%d, bank=%p\n", gpio, bank);
return bank;
}
upto = data->max_gpio;
data++;
}
return NULL;
}
static void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg)
{
unsigned int value;
value = readl(&bank->con);
value &= ~CON_MASK(gpio);
value |= CON_SFR(gpio, cfg);
writel(value, &bank->con);
}
static void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en)
{
unsigned int value;
value = readl(&bank->dat);
value &= ~DAT_MASK(gpio);
if (en)
value |= DAT_SET(gpio);
writel(value, &bank->dat);
}
#ifdef CONFIG_SPL_BUILD
/* Common GPIO API - SPL does not support driver model yet */
int gpio_set_value(unsigned gpio, int value)
{
s5p_gpio_set_value(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio), value);
return 0;
}
#else
static int s5p_gpio_get_cfg_pin(struct s5p_gpio_bank *bank, int gpio)
{
unsigned int value;
value = readl(&bank->con);
value &= CON_MASK(gpio);
return CON_SFR_UNSHIFT(value, gpio);
}
static unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio)
{
unsigned int value;
value = readl(&bank->dat);
return !!(value & DAT_MASK(gpio));
}
#endif /* CONFIG_SPL_BUILD */
static void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode)
{
unsigned int value;
value = readl(&bank->pull);
value &= ~PULL_MASK(gpio);
switch (mode) {
case S5P_GPIO_PULL_DOWN:
case S5P_GPIO_PULL_UP:
value |= PULL_MODE(gpio, mode);
break;
default:
break;
}
writel(value, &bank->pull);
}
static void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode)
{
unsigned int value;
value = readl(&bank->drv);
value &= ~DRV_MASK(gpio);
switch (mode) {
case S5P_GPIO_DRV_1X:
case S5P_GPIO_DRV_2X:
case S5P_GPIO_DRV_3X:
case S5P_GPIO_DRV_4X:
value |= DRV_SET(gpio, mode);
break;
default:
return;
}
writel(value, &bank->drv);
}
static void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
{
unsigned int value;
value = readl(&bank->drv);
value &= ~RATE_MASK(gpio);
switch (mode) {
case S5P_GPIO_DRV_FAST:
case S5P_GPIO_DRV_SLOW:
value |= RATE_SET(gpio);
break;
default:
return;
}
writel(value, &bank->drv);
}
int s5p_gpio_get_pin(unsigned gpio)
{
return S5P_GPIO_GET_PIN(gpio);
}
/* Driver model interface */
#ifndef CONFIG_SPL_BUILD
static int exynos_gpio_get_state(struct udevice *dev, unsigned int offset,
char *buf, int bufsize)
{
struct gpio_dev_priv *uc_priv = dev->uclass_priv;
struct exynos_bank_info *state = dev_get_priv(dev);
const char *label;
bool is_output;
int size;
int cfg;
label = state->label[offset];
cfg = s5p_gpio_get_cfg_pin(state->bank, offset);
is_output = cfg == S5P_GPIO_OUTPUT;
size = snprintf(buf, bufsize, "%s%d: ",
uc_priv->bank_name ? uc_priv->bank_name : "", offset);
buf += size;
bufsize -= size;
if (is_output || cfg == S5P_GPIO_INPUT) {
snprintf(buf, bufsize, "%s: %d [%c]%s%s",
is_output ? "out" : " in",
s5p_gpio_get_value(state->bank, offset),
*label ? 'x' : ' ',
*label ? " " : "",
label);
} else {
snprintf(buf, bufsize, "sfpio");
}
return 0;
}
static int check_reserved(struct udevice *dev, unsigned offset,
const char *func)
{
struct exynos_bank_info *state = dev_get_priv(dev);
struct gpio_dev_priv *uc_priv = dev->uclass_priv;
if (!*state->label[offset]) {
printf("exynos_gpio: %s: error: gpio %s%d not reserved\n",
func, uc_priv->bank_name, offset);
return -EPERM;
}
return 0;
}
/* set GPIO pin 'gpio' as an input */
static int exynos_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct exynos_bank_info *state = dev_get_priv(dev);
int ret;
ret = check_reserved(dev, offset, __func__);
if (ret)
return ret;
/* Configure GPIO direction as input. */
s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_INPUT);
return 0;
}
/* set GPIO pin 'gpio' as an output, with polarity 'value' */
static int exynos_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
struct exynos_bank_info *state = dev_get_priv(dev);
int ret;
ret = check_reserved(dev, offset, __func__);
if (ret)
return ret;
/* Configure GPIO output value. */
s5p_gpio_set_value(state->bank, offset, value);
/* Configure GPIO direction as output. */
s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_OUTPUT);
return 0;
}
/* read GPIO IN value of pin 'gpio' */
static int exynos_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct exynos_bank_info *state = dev_get_priv(dev);
int ret;
ret = check_reserved(dev, offset, __func__);
if (ret)
return ret;
return s5p_gpio_get_value(state->bank, offset);
}
/* write GPIO OUT value to pin 'gpio' */
static int exynos_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct exynos_bank_info *state = dev_get_priv(dev);
int ret;
ret = check_reserved(dev, offset, __func__);
if (ret)
return ret;
s5p_gpio_set_value(state->bank, offset, value);
return 0;
}
static int exynos_gpio_request(struct udevice *dev, unsigned offset,
const char *label)
{
struct exynos_bank_info *state = dev_get_priv(dev);
if (*state->label[offset])
return -EBUSY;
strncpy(state->label[offset], label, GPIO_NAME_SIZE);
state->label[offset][GPIO_NAME_SIZE - 1] = '\0';
return 0;
}
static int exynos_gpio_free(struct udevice *dev, unsigned offset)
{
struct exynos_bank_info *state = dev_get_priv(dev);
int ret;
ret = check_reserved(dev, offset, __func__);
if (ret)
return ret;
state->label[offset][0] = '\0';
return 0;
}
#endif /* nCONFIG_SPL_BUILD */
/*
* There is no common GPIO API for pull, drv, pin, rate (yet). These
* functions are kept here to preserve function ordering for review.
*/
void gpio_set_pull(int gpio, int mode)
{
s5p_gpio_set_pull(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio), mode);
}
void gpio_set_drv(int gpio, int mode)
{
s5p_gpio_set_drv(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio), mode);
}
void gpio_cfg_pin(int gpio, int cfg)
{
s5p_gpio_cfg_pin(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio), cfg);
}
void gpio_set_rate(int gpio, int mode)
{
s5p_gpio_set_rate(s5p_gpio_get_bank(gpio),
s5p_gpio_get_pin(gpio), mode);
}
#ifndef CONFIG_SPL_BUILD
static int exynos_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct exynos_bank_info *state = dev_get_priv(dev);
int cfg;
if (!*state->label[offset])
return GPIOF_UNUSED;
cfg = s5p_gpio_get_cfg_pin(state->bank, offset);
if (cfg == S5P_GPIO_OUTPUT)
return GPIOF_OUTPUT;
else if (cfg == S5P_GPIO_INPUT)
return GPIOF_INPUT;
else
return GPIOF_FUNC;
}
static const struct dm_gpio_ops gpio_exynos_ops = {
.request = exynos_gpio_request,
.free = exynos_gpio_free,
.direction_input = exynos_gpio_direction_input,
.direction_output = exynos_gpio_direction_output,
.get_value = exynos_gpio_get_value,
.set_value = exynos_gpio_set_value,
.get_function = exynos_gpio_get_function,
.get_state = exynos_gpio_get_state,
};
static int gpio_exynos_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev->uclass_priv;
struct exynos_bank_info *priv = dev->priv;
struct exynos_gpio_platdata *plat = dev->platdata;
/* Only child devices have ports */
if (!plat)
return 0;
priv->bank = plat->bank;
uc_priv->gpio_count = GPIO_PER_BANK;
uc_priv->bank_name = plat->bank_name;
return 0;
}
/**
* We have a top-level GPIO device with no actual GPIOs. It has a child
* device for each Exynos GPIO bank.
*/
static int gpio_exynos_bind(struct udevice *parent)
{
struct exynos_gpio_platdata *plat = parent->platdata;
struct s5p_gpio_bank *bank, *base;
const void *blob = gd->fdt_blob;
int node;
/* If this is a child device, there is nothing to do here */
if (plat)
return 0;
base = (struct s5p_gpio_bank *)fdtdec_get_addr(gd->fdt_blob,
parent->of_offset, "reg");
for (node = fdt_first_subnode(blob, parent->of_offset), bank = base;
node > 0;
node = fdt_next_subnode(blob, node), bank++) {
struct exynos_gpio_platdata *plat;
struct udevice *dev;
fdt_addr_t reg;
int ret;
if (!fdtdec_get_bool(blob, node, "gpio-controller"))
continue;
plat = calloc(1, sizeof(*plat));
if (!plat)
return -ENOMEM;
reg = fdtdec_get_addr(blob, node, "reg");
if (reg != FDT_ADDR_T_NONE)
bank = (struct s5p_gpio_bank *)((ulong)base + reg);
plat->bank = bank;
plat->bank_name = fdt_get_name(blob, node, NULL);
debug("dev at %p: %s\n", bank, plat->bank_name);
ret = device_bind(parent, parent->driver,
plat->bank_name, plat, -1, &dev);
if (ret)
return ret;
dev->of_offset = parent->of_offset;
}
return 0;
}
static const struct udevice_id exynos_gpio_ids[] = {
{ .compatible = "samsung,s5pc100-pinctrl" },
{ .compatible = "samsung,s5pc110-pinctrl" },
{ .compatible = "samsung,exynos4210-pinctrl" },
{ .compatible = "samsung,exynos4x12-pinctrl" },
{ .compatible = "samsung,exynos5250-pinctrl" },
{ .compatible = "samsung,exynos5420-pinctrl" },
{ }
};
U_BOOT_DRIVER(gpio_exynos) = {
.name = "gpio_exynos",
.id = UCLASS_GPIO,
.of_match = exynos_gpio_ids,
.bind = gpio_exynos_bind,
.probe = gpio_exynos_probe,
.priv_auto_alloc_size = sizeof(struct exynos_bank_info),
.ops = &gpio_exynos_ops,
};
#endif