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// SPDX-License-Identifier: GPL-2.0
/*
* 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 int 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 int group,
const unsigned int **pins,
unsigned int *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 int 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 int 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 int *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 int 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 int func,
const char * const **groups,
unsigned int * 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 int func,
unsigned int 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]] =
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