blob: 0c3e498ae99cde7ff67818a96e84a37410d206e6 [file] [log] [blame]
/*
* linux/drivers/pinctrl/pinctrl-rt2880.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* publishhed by the Free Software Foundation.
*
* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <asm/mach-ralink/ralink_regs.h>
#include <asm/mach-ralink/pinmux.h>
#include <asm/mach-ralink/mt7620.h>
#include "core.h"
#define SYSC_REG_GPIO_MODE 0x60
#define SYSC_REG_GPIO_MODE2 0x64
struct rt2880_priv {
struct device *dev;
struct pinctrl_pin_desc *pads;
struct pinctrl_desc *desc;
struct rt2880_pmx_func **func;
int func_count;
struct rt2880_pmx_group *groups;
const char **group_names;
int group_count;
uint8_t *gpio;
int max_pins;
};
static int rt2880_get_group_count(struct pinctrl_dev *pctrldev)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
return p->group_count;
}
static const char *rt2880_get_group_name(struct pinctrl_dev *pctrldev,
unsigned group)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
if (group >= p->group_count)
return NULL;
return p->group_names[group];
}
static int rt2880_get_group_pins(struct pinctrl_dev *pctrldev,
unsigned group,
const unsigned **pins,
unsigned *num_pins)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
if (group >= p->group_count)
return -EINVAL;
*pins = p->groups[group].func[0].pins;
*num_pins = p->groups[group].func[0].pin_count;
return 0;
}
static void rt2880_pinctrl_dt_free_map(struct pinctrl_dev *pctrldev,
struct pinctrl_map *map, unsigned num_maps)
{
int i;
for (i = 0; i < num_maps; i++)
if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN ||
map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
kfree(map[i].data.configs.configs);
kfree(map);
}
static void rt2880_pinctrl_pin_dbg_show(struct pinctrl_dev *pctrldev,
struct seq_file *s,
unsigned offset)
{
seq_printf(s, "ralink pio");
}
static void rt2880_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctrldev,
struct device_node *np,
struct pinctrl_map **map)
{
const char *function;
int func = of_property_read_string(np, "ralink,function", &function);
int grps = of_property_count_strings(np, "ralink,group");
int i;
if (func || !grps)
return;
for (i = 0; i < grps; i++) {
const char *group;
of_property_read_string_index(np, "ralink,group", i, &group);
(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
(*map)->name = function;
(*map)->data.mux.group = group;
(*map)->data.mux.function = function;
(*map)++;
}
}
static int rt2880_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrldev,
struct device_node *np_config,
struct pinctrl_map **map,
unsigned *num_maps)
{
int max_maps = 0;
struct pinctrl_map *tmp;
struct device_node *np;
for_each_child_of_node(np_config, np) {
int ret = of_property_count_strings(np, "ralink,group");
if (ret >= 0)
max_maps += ret;
}
if (!max_maps)
return max_maps;
*map = kcalloc(max_maps, sizeof(struct pinctrl_map), GFP_KERNEL);
if (!*map)
return -ENOMEM;
tmp = *map;
for_each_child_of_node(np_config, np)
rt2880_pinctrl_dt_subnode_to_map(pctrldev, np, &tmp);
*num_maps = max_maps;
return 0;
}
static const struct pinctrl_ops rt2880_pctrl_ops = {
.get_groups_count = rt2880_get_group_count,
.get_group_name = rt2880_get_group_name,
.get_group_pins = rt2880_get_group_pins,
.pin_dbg_show = rt2880_pinctrl_pin_dbg_show,
.dt_node_to_map = rt2880_pinctrl_dt_node_to_map,
.dt_free_map = rt2880_pinctrl_dt_free_map,
};
static int rt2880_pmx_func_count(struct pinctrl_dev *pctrldev)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
return p->func_count;
}
static const char *rt2880_pmx_func_name(struct pinctrl_dev *pctrldev,
unsigned func)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
return p->func[func]->name;
}
static int rt2880_pmx_group_get_groups(struct pinctrl_dev *pctrldev,
unsigned func,
const char * const **groups,
unsigned * const num_groups)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
if (p->func[func]->group_count == 1)
*groups = &p->group_names[p->func[func]->groups[0]];
else
*groups = p->group_names;
*num_groups = p->func[func]->group_count;
return 0;
}
static int rt2880_pmx_group_enable(struct pinctrl_dev *pctrldev,
unsigned func,
unsigned group)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
u32 mode = 0;
u32 reg = SYSC_REG_GPIO_MODE;
int i;
int shift;
/* dont allow double use */
if (p->groups[group].enabled) {
dev_err(p->dev, "%s is already enabled\n", p->groups[group].name);
return -EBUSY;
}
p->groups[group].enabled = 1;
p->func[func]->enabled = 1;
shift = p->groups[group].shift;
if (shift >= 32) {
shift -= 32;
reg = SYSC_REG_GPIO_MODE2;
}
mode = rt_sysc_r32(reg);
mode &= ~(p->groups[group].mask << shift);
/* mark the pins as gpio */
for (i = 0; i < p->groups[group].func[0].pin_count; i++)
p->gpio[p->groups[group].func[0].pins[i]] = 1;
/* function 0 is gpio and needs special handling */
if (func == 0) {
mode |= p->groups[group].gpio << shift;
} else {
for (i = 0; i < p->func[func]->pin_count; i++)
p->gpio[p->func[func]->pins[i]] = 0;
mode |= p->func[func]->value << shift;
}
rt_sysc_w32(mode, reg);
return 0;
}
static int rt2880_pmx_group_gpio_request_enable(struct pinctrl_dev *pctrldev,
struct pinctrl_gpio_range *range,
unsigned pin)
{
struct rt2880_priv *p = pinctrl_dev_get_drvdata(pctrldev);
if (!p->gpio[pin]) {
dev_err(p->dev, "pin %d is not set to gpio mux\n", pin);
return -EINVAL;
}
return 0;
}
static const struct pinmux_ops rt2880_pmx_group_ops = {
.get_functions_count = rt2880_pmx_func_count,
.get_function_name = rt2880_pmx_func_name,
.get_function_groups = rt2880_pmx_group_get_groups,
.set_mux = rt2880_pmx_group_enable,
.gpio_request_enable = rt2880_pmx_group_gpio_request_enable,
};
static struct pinctrl_desc rt2880_pctrl_desc = {
.owner = THIS_MODULE,
.name = "rt2880-pinmux",
.pctlops = &rt2880_pctrl_ops,
.pmxops = &rt2880_pmx_group_ops,
};
static struct rt2880_pmx_func gpio_func = {
.name = "gpio",
};
static int rt2880_pinmux_index(struct rt2880_priv *p)
{
struct rt2880_pmx_func **f;
struct rt2880_pmx_group *mux = p->groups;
int i, j, c = 0;
/* count the mux functions */
while (mux->name) {
p->group_count++;
mux++;
}
/* allocate the group names array needed by the gpio function */
p->group_names = devm_kcalloc(p->dev, p->group_count, sizeof(char *),
GFP_KERNEL);
if (!p->group_names)
return -1;
for (i = 0; i < p->group_count; i++) {
p->group_names[i] = p->groups[i].name;
p->func_count += p->groups[i].func_count;
}
/* we have a dummy function[0] for gpio */
p->func_count++;
/* allocate our function and group mapping index buffers */
f = p->func = devm_kcalloc(p->dev,
p->func_count,
sizeof(struct rt2880_pmx_func),
GFP_KERNEL);
gpio_func.groups = devm_kcalloc(p->dev, p->group_count, sizeof(int),
GFP_KERNEL);
if (!f || !gpio_func.groups)
return -1;
/* add a backpointer to the function so it knows its group */
gpio_func.group_count = p->group_count;
for (i = 0; i < gpio_func.group_count; i++)
gpio_func.groups[i] = i;
f[c] = &gpio_func;
c++;
/* add remaining functions */
for (i = 0; i < p->group_count; i++) {
for (j = 0; j < p->groups[i].func_count; j++) {
f[c] = &p->groups[i].func[j];
f[c]->groups = devm_kzalloc(p->dev, sizeof(int), GFP_KERNEL);
f[c]->groups[0] = i;
f[c]->group_count = 1;
c++;
}
}
return 0;
}
static int rt2880_pinmux_pins(struct rt2880_priv *p)
{
int i, j;
/* loop over the functions and initialize the pins array. also work out the highest pin used */
for (i = 0; i < p->func_count; i++) {
int pin;
if (!p->func[i]->pin_count)
continue;
p->func[i]->pins = devm_kcalloc(p->dev,
p->func[i]->pin_count,
sizeof(int),
GFP_KERNEL);
for (j = 0; j < p->func[i]->pin_count; j++)
p->func[i]->pins[j] = p->func[i]->pin_first + j;
pin = p->func[i]->pin_first + p->func[i]->pin_count;
if (pin > p->max_pins)
p->max_pins = pin;
}
/* the buffer that tells us which pins are gpio */
p->gpio = devm_kcalloc(p->dev,p->max_pins, sizeof(uint8_t),
GFP_KERNEL);
/* the pads needed to tell pinctrl about our pins */
p->pads = devm_kcalloc(p->dev,
p->max_pins, sizeof(struct pinctrl_pin_desc),
GFP_KERNEL);
if (!p->pads || !p->gpio ) {
dev_err(p->dev, "Failed to allocate gpio data\n");
return -ENOMEM;
}
memset(p->gpio, 1, sizeof(uint8_t) * p->max_pins);
for (i = 0; i < p->func_count; i++) {
if (!p->func[i]->pin_count)
continue;
for (j = 0; j < p->func[i]->pin_count; j++)
p->gpio[p->func[i]->pins[j]] = 0;
}
/* pin 0 is always a gpio */
p->gpio[0] = 1;
/* set the pads */
for (i = 0; i < p->max_pins; i++) {
/* strlen("ioXY") + 1 = 5 */
char *name = devm_kzalloc(p->dev, 5, GFP_KERNEL);
if (!name) {
dev_err(p->dev, "Failed to allocate pad name\n");
return -ENOMEM;
}
snprintf(name, 5, "io%d", i);
p->pads[i].number = i;
p->pads[i].name = name;
}
p->desc->pins = p->pads;
p->desc->npins = p->max_pins;
return 0;
}
static int rt2880_pinmux_probe(struct platform_device *pdev)
{
struct rt2880_priv *p;
struct pinctrl_dev *dev;
struct device_node *np;
if (!rt2880_pinmux_data)
return -ENOSYS;
/* setup the private data */
p = devm_kzalloc(&pdev->dev, sizeof(struct rt2880_priv), GFP_KERNEL);
if (!p)
return -ENOMEM;
p->dev = &pdev->dev;
p->desc = &rt2880_pctrl_desc;
p->groups = rt2880_pinmux_data;
platform_set_drvdata(pdev, p);
/* init the device */
if (rt2880_pinmux_index(p)) {
dev_err(&pdev->dev, "failed to load index\n");
return -EINVAL;
}
if (rt2880_pinmux_pins(p)) {
dev_err(&pdev->dev, "failed to load pins\n");
return -EINVAL;
}
dev = pinctrl_register(p->desc, &pdev->dev, p);
if (IS_ERR(dev))
return PTR_ERR(dev);
/* finalize by adding gpio ranges for enables gpio controllers */
for_each_compatible_node(np, NULL, "ralink,rt2880-gpio") {
const __be32 *ngpio, *gpiobase;
struct pinctrl_gpio_range *range;
char *name;
if (!of_device_is_available(np))
continue;
ngpio = of_get_property(np, "ralink,num-gpios", NULL);
gpiobase = of_get_property(np, "ralink,gpio-base", NULL);
if (!ngpio || !gpiobase) {
dev_err(&pdev->dev, "failed to load chip info\n");
return -EINVAL;
}
range = devm_kzalloc(p->dev, sizeof(struct pinctrl_gpio_range) + 4, GFP_KERNEL);
range->name = name = (char *) &range[1];
sprintf(name, "pio");
range->npins = __be32_to_cpu(*ngpio);
range->base = __be32_to_cpu(*gpiobase);
range->pin_base = range->base;
pinctrl_add_gpio_range(dev, range);
}
return 0;
}
static const struct of_device_id rt2880_pinmux_match[] = {
{ .compatible = "ralink,rt2880-pinmux" },
{},
};
MODULE_DEVICE_TABLE(of, rt2880_pinmux_match);
static struct platform_driver rt2880_pinmux_driver = {
.probe = rt2880_pinmux_probe,
.driver = {
.name = "rt2880-pinmux",
.of_match_table = rt2880_pinmux_match,
},
};
int __init rt2880_pinmux_init(void)
{
return platform_driver_register(&rt2880_pinmux_driver);
}
core_initcall_sync(rt2880_pinmux_init);