- 根目录:
- drivers
- pinctrl
- vt8500
- pinctrl-wmt.c
/*
* Pinctrl driver for the Wondermedia SoC's
*
* Copyright (c) 2013 Tony Prisk <linux@prisktech.co.nz>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "pinctrl-wmt.h"
static inline void wmt_setbits(struct wmt_pinctrl_data *data, u32 reg,
u32 mask)
{
u32 val;
val = readl_relaxed(data->base + reg);
val |= mask;
writel_relaxed(val, data->base + reg);
}
static inline void wmt_clearbits(struct wmt_pinctrl_data *data, u32 reg,
u32 mask)
{
u32 val;
val = readl_relaxed(data->base + reg);
val &= ~mask;
writel_relaxed(val, data->base + reg);
}
enum wmt_func_sel {
WMT_FSEL_GPIO_IN = 0,
WMT_FSEL_GPIO_OUT = 1,
WMT_FSEL_ALT = 2,
WMT_FSEL_COUNT = 3,
};
static const char * const wmt_functions[WMT_FSEL_COUNT] = {
[WMT_FSEL_GPIO_IN] = "gpio_in",
[WMT_FSEL_GPIO_OUT] = "gpio_out",
[WMT_FSEL_ALT] = "alt",
};
static int wmt_pmx_get_functions_count(struct pinctrl_dev *pctldev)
{
return WMT_FSEL_COUNT;
}
static const char *wmt_pmx_get_function_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return wmt_functions[selector];
}
static int wmt_pmx_get_function_groups(struct pinctrl_dev *pctldev,
unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
/* every pin does every function */
*groups = data->groups;
*num_groups = data->ngroups;
return 0;
}
static int wmt_set_pinmux(struct wmt_pinctrl_data *data, unsigned func,
unsigned pin)
{
u32 bank = WMT_BANK_FROM_PIN(pin);
u32 bit = WMT_BIT_FROM_PIN(pin);
u32 reg_en = data->banks[bank].reg_en;
u32 reg_dir = data->banks[bank].reg_dir;
if (reg_dir == NO_REG) {
dev_err(data->dev, "pin:%d no direction register defined\n",
pin);
return -EINVAL;
}
/*
* If reg_en == NO_REG, we assume it is a dedicated GPIO and cannot be
* disabled (as on VT8500) and that no alternate function is available.
*/
switch (func) {
case WMT_FSEL_GPIO_IN:
if (reg_en != NO_REG)
wmt_setbits(data, reg_en, BIT(bit));
wmt_clearbits(data, reg_dir, BIT(bit));
break;
case WMT_FSEL_GPIO_OUT:
if (reg_en != NO_REG)
wmt_setbits(data, reg_en, BIT(bit));
wmt_setbits(data, reg_dir, BIT(bit));
break;
case WMT_FSEL_ALT:
if (reg_en == NO_REG) {
dev_err(data->dev, "pin:%d no alt function available\n",
pin);
return -EINVAL;
}
wmt_clearbits(data, reg_en, BIT(bit));
}
return 0;
}
static int wmt_pmx_enable(struct pinctrl_dev *pctldev,
unsigned func_selector,
unsigned group_selector)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
u32 pinnum = data->pins[group_selector].number;
return wmt_set_pinmux(data, func_selector, pinnum);
}
static void wmt_pmx_disable(struct pinctrl_dev *pctldev,
unsigned func_selector,
unsigned group_selector)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
u32 pinnum = data->pins[group_selector].number;
/* disable by setting GPIO_IN */
wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, pinnum);
}
static void wmt_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
/* disable by setting GPIO_IN */
wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, offset);
}
static int wmt_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset,
bool input)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
wmt_set_pinmux(data, (input ? WMT_FSEL_GPIO_IN : WMT_FSEL_GPIO_OUT),
offset);
return 0;
}
static struct pinmux_ops wmt_pinmux_ops = {
.get_functions_count = wmt_pmx_get_functions_count,
.get_function_name = wmt_pmx_get_function_name,
.get_function_groups = wmt_pmx_get_function_groups,
.enable = wmt_pmx_enable,
.disable = wmt_pmx_disable,
.gpio_disable_free = wmt_pmx_gpio_disable_free,
.gpio_set_direction = wmt_pmx_gpio_set_direction,
};
static int wmt_get_groups_count(struct pinctrl_dev *pctldev)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
return data->ngroups;
}
static const char *wmt_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
return data->groups[selector];
}
static int wmt_get_group_pins(struct pinctrl_dev *pctldev,
unsigned selector,
const unsigned **pins,
unsigned *num_pins)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
*pins = &data->pins[selector].number;
*num_pins = 1;
return 0;
}
static int wmt_pctl_find_group_by_pin(struct wmt_pinctrl_data *data, u32 pin)
{
int i;
for (i = 0; i < data->npins; i++) {
if (data->pins[i].number == pin)
return i;
}
return -EINVAL;
}
static int wmt_pctl_dt_node_to_map_func(struct wmt_pinctrl_data *data,
struct device_node *np,
u32 pin, u32 fnum,
struct pinctrl_map **maps)
{
int group;
struct pinctrl_map *map = *maps;
if (fnum >= ARRAY_SIZE(wmt_functions)) {
dev_err(data->dev, "invalid wm,function %d\n", fnum);
return -EINVAL;
}
group = wmt_pctl_find_group_by_pin(data, pin);
if (group < 0) {
dev_err(data->dev, "unable to match pin %d to group\n", pin);
return group;
}
map->type = PIN_MAP_TYPE_MUX_GROUP;
map->data.mux.group = data->groups[group];
map->data.mux.function = wmt_functions[fnum];
(*maps)++;
return 0;
}
static int wmt_pctl_dt_node_to_map_pull(struct wmt_pinctrl_data *data,
struct device_node *np,
u32 pin, u32 pull,
struct pinctrl_map **maps)
{
int group;
unsigned long *configs;
struct pinctrl_map *map = *maps;
if (pull > 2) {
dev_err(data->dev, "invalid wm,pull %d\n", pull);
return -EINVAL;
}
group = wmt_pctl_find_group_by_pin(data, pin);
if (group < 0) {
dev_err(data->dev, "unable to match pin %d to group\n", pin);
return group;
}
configs = kzalloc(sizeof(*configs), GFP_KERNEL);
if (!configs)
return -ENOMEM;
configs[0] = pull;
map->type = PIN_MAP_TYPE_CONFIGS_PIN;
map->data.configs.group_or_pin = data->groups[group];
map->data.configs.configs = configs;
map->data.configs.num_configs = 1;
(*maps)++;
return 0;
}
static void wmt_pctl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *maps,
unsigned num_maps)
{
int i;
for (i = 0; i < num_maps; i++)
if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
kfree(maps[i].data.configs.configs);
kfree(maps);
}
static int wmt_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map,
unsigned *num_maps)
{
struct pinctrl_map *maps, *cur_map;
struct property *pins, *funcs, *pulls;
u32 pin, func, pull;
int num_pins, num_funcs, num_pulls, maps_per_pin;
int i, err;
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
pins = of_find_property(np, "wm,pins", NULL);
if (!pins) {
dev_err(data->dev, "missing wmt,pins property\n");
return -EINVAL;
}
funcs = of_find_property(np, "wm,function", NULL);
pulls = of_find_property(np, "wm,pull", NULL);
if (!funcs && !pulls) {
dev_err(data->dev, "neither wm,function nor wm,pull specified\n");
return -EINVAL;
}
/*
* The following lines calculate how many values are defined for each
* of the properties.
*/
num_pins = pins->length / sizeof(u32);
num_funcs = funcs ? (funcs->length / sizeof(u32)) : 0;
num_pulls = pulls ? (pulls->length / sizeof(u32)) : 0;
if (num_funcs > 1 && num_funcs != num_pins) {
dev_err(data->dev, "wm,function must have 1 or %d entries\n",
num_pins);
return -EINVAL;
}
if (num_pulls > 1 && num_pulls != num_pins) {
dev_err(data->dev, "wm,pull must have 1 or %d entries\n",
num_pins);
return -EINVAL;
}
maps_per_pin = 0;
if (num_funcs)
maps_per_pin++;
if (num_pulls)
maps_per_pin++;
cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps),
GFP_KERNEL);
if (!maps)
return -ENOMEM;
for (i = 0; i < num_pins; i++) {
err = of_property_read_u32_index(np, "wm,pins", i, &pin);
if (err)
goto fail;
if (pin >= (data->nbanks * 32)) {
dev_err(data->dev, "invalid wm,pins value\n");
err = -EINVAL;
goto fail;
}
if (num_funcs) {
err = of_property_read_u32_index(np, "wm,function",
(num_funcs > 1 ? i : 0), &func);
if (err)
goto fail;
err = wmt_pctl_dt_node_to_map_func(data, np, pin, func,
&cur_map);
if (err)
goto fail;
}
if (num_pulls) {
err = of_property_read_u32_index(np, "wm,pull",
(num_pulls > 1 ? i : 0), &pull);
if (err)
goto fail;
err = wmt_pctl_dt_node_to_map_pull(data, np, pin, pull,
&cur_map);
if (err)
goto fail;
}
}
*map = maps;
*num_maps = num_pins * maps_per_pin;
return 0;
/*
* The fail path removes any maps that have been allocated. The fail path is
* only called from code after maps has been kzalloc'd. It is also safe to
* pass 'num_pins * maps_per_pin' as the map count even though we probably
* failed before all the mappings were read as all maps are allocated at once,
* and configs are only allocated for .type = PIN_MAP_TYPE_CONFIGS_PIN - there
* is no failpath where a config can be allocated without .type being set.
*/
fail:
wmt_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin);
return err;
}
static struct pinctrl_ops wmt_pctl_ops = {
.get_groups_count = wmt_get_groups_count,
.get_group_name = wmt_get_group_name,
.get_group_pins = wmt_get_group_pins,
.dt_node_to_map = wmt_pctl_dt_node_to_map,
.dt_free_map = wmt_pctl_dt_free_map,
};
static int wmt_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *config)
{
return -ENOTSUPP;
}
static int wmt_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long config)
{
struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(config);
u16 arg = pinconf_to_config_argument(config);
u32 bank = WMT_BANK_FROM_PIN(pin);
u32 bit = WMT_BIT_FROM_PIN(pin);
u32 reg_pull_en = data->banks[bank].reg_pull_en;
u32 reg_pull_cfg = data->banks[bank].reg_pull_cfg;
if ((reg_pull_en == NO_REG) || (reg_pull_cfg == NO_REG)) {
dev_err(data->dev, "bias functions not supported on pin %d\n",
pin);
return -EINVAL;
}
if ((param == PIN_CONFIG_BIAS_PULL_DOWN) ||
(param == PIN_CONFIG_BIAS_PULL_UP)) {
if (arg == 0)
param = PIN_CONFIG_BIAS_DISABLE;
}
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
wmt_clearbits(data, reg_pull_en, BIT(bit));
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
wmt_clearbits(data, reg_pull_cfg, BIT(bit));
wmt_setbits(data, reg_pull_en, BIT(bit));
break;
case PIN_CONFIG_BIAS_PULL_UP:
wmt_setbits(data, reg_pull_cfg, BIT(bit));
wmt_setbits(data, reg_pull_en, BIT(bit));
break;
default:
dev_err(data->dev, "unknown pinconf param\n");
return -EINVAL;
}
return 0;
}
static struct pinconf_ops wmt_pinconf_ops = {
.pin_config_get = wmt_pinconf_get,
.pin_config_set = wmt_pinconf_set,
};
static struct pinctrl_desc wmt_desc = {
.owner = THIS_MODULE,
.name = "pinctrl-wmt",
.pctlops = &wmt_pctl_ops,
.pmxops = &wmt_pinmux_ops,
.confops = &wmt_pinconf_ops,
};
static int wmt_gpio_request(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_request_gpio(chip->base + offset);
}
static void wmt_gpio_free(struct gpio_chip *chip, unsigned offset)
{
pinctrl_free_gpio(chip->base + offset);
}
static int wmt_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct wmt_pinctrl_data *data = dev_get_drvdata(chip->dev);
u32 bank = WMT_BANK_FROM_PIN(offset);
u32 bit = WMT_BIT_FROM_PIN(offset);
u32 reg_dir = data->banks[bank].reg_dir;
u32 val;
val = readl_relaxed(data->base + reg_dir);
if (val & BIT(bit))
return GPIOF_DIR_OUT;
else
return GPIOF_DIR_IN;
}
static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
}
static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
return pinctrl_gpio_direction_output(chip->base + offset);
}
static int wmt_gpio_get_value(struct gpio_chip *chip, unsigned offset)
{
struct wmt_pinctrl_data *data = dev_get_drvdata(chip->dev);
u32 bank = WMT_BANK_FROM_PIN(offset);
u32 bit = WMT_BIT_FROM_PIN(offset);
u32 reg_data_in = data->banks[bank].reg_data_in;
if (reg_data_in == NO_REG) {
dev_err(data->dev, "no data in register defined\n");
return -EINVAL;
}
return !!(readl_relaxed(data->base + reg_data_in) & BIT(bit));
}
static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset,
int val)
{
struct wmt_pinctrl_data *data = dev_get_drvdata(chip->dev);
u32 bank = WMT_BANK_FROM_PIN(offset);
u32 bit = WMT_BIT_FROM_PIN(offset);
u32 reg_data_out = data->banks[bank].reg_data_out;
if (reg_data_out == NO_REG) {
dev_err(data->dev, "no data out register defined\n");
return;
}
if (val)
wmt_setbits(data, reg_data_out, BIT(bit));
else
wmt_clearbits(data, reg_data_out, BIT(bit));
}
static struct gpio_chip wmt_gpio_chip = {
.label = "gpio-wmt",
.owner = THIS_MODULE,
.request = wmt_gpio_request,
.free = wmt_gpio_free,
.get_direction = wmt_gpio_get_direction,
.direction_input = wmt_gpio_direction_input,
.direction_output = wmt_gpio_direction_output,
.get = wmt_gpio_get_value,
.set = wmt_gpio_set_value,
.can_sleep = 0,
};
int wmt_pinctrl_probe(struct platform_device *pdev,
struct wmt_pinctrl_data *data)
{
int err;
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_request_and_ioremap(&pdev->dev, res);
if (!data->base) {
dev_err(&pdev->dev, "failed to map memory resource\n");
return -EBUSY;
}
wmt_desc.pins = data->pins;
wmt_desc.npins = data->npins;
data->gpio_chip = wmt_gpio_chip;
data->gpio_chip.dev = &pdev->dev;
data->gpio_chip.of_node = pdev->dev.of_node;
data->gpio_chip.ngpio = data->nbanks * 32;
platform_set_drvdata(pdev, data);
data->dev = &pdev->dev;
data->pctl_dev = pinctrl_register(&wmt_desc, &pdev->dev, data);
if (!data->pctl_dev) {
dev_err(&pdev->dev, "Failed to register pinctrl\n");
return -EINVAL;
}
err = gpiochip_add(&data->gpio_chip);
if (err) {
dev_err(&pdev->dev, "could not add GPIO chip\n");
goto fail_gpio;
}
err = gpiochip_add_pin_range(&data->gpio_chip, dev_name(data->dev),
0, 0, data->nbanks * 32);
if (err)
goto fail_range;
dev_info(&pdev->dev, "Pin controller initialized\n");
return 0;
fail_range:
if (gpiochip_remove(&data->gpio_chip))
dev_err(&pdev->dev, "failed to remove gpio chip\n");
fail_gpio:
pinctrl_unregister(data->pctl_dev);
return err;
}
int wmt_pinctrl_remove(struct platform_device *pdev)
{
struct wmt_pinctrl_data *data = platform_get_drvdata(pdev);
int err;
err = gpiochip_remove(&data->gpio_chip);
if (err)
dev_err(&pdev->dev, "failed to remove gpio chip\n");
pinctrl_unregister(data->pctl_dev);
return 0;
}