staging: mt7621-pinctrl: ralink: add pinctrl driver
Signed-off-by: John Crispin <blogic@openwrt.org> Signed-off-by: NeilBrown <neil@brown.name> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
03f152e31f
commit
0317d60de8
|
@ -118,4 +118,6 @@ source "drivers/staging/vboxvideo/Kconfig"
|
|||
|
||||
source "drivers/staging/pi433/Kconfig"
|
||||
|
||||
source "drivers/staging/mt7621-pinctrl/Kconfig"
|
||||
|
||||
endif # STAGING
|
||||
|
|
|
@ -50,3 +50,4 @@ obj-$(CONFIG_BCM2835_VCHIQ) += vc04_services/
|
|||
obj-$(CONFIG_DRM_VBOXVIDEO) += vboxvideo/
|
||||
obj-$(CONFIG_PI433) += pi433/
|
||||
obj-$(CONFIG_SOC_MT7621) += mt7621-pci/
|
||||
obj-$(CONFIG_SOC_MT7621) += mt7621-pinctrl/
|
||||
|
|
4
drivers/staging/mt7621-pinctrl/Kconfig
Normal file
4
drivers/staging/mt7621-pinctrl/Kconfig
Normal file
|
@ -0,0 +1,4 @@
|
|||
config PINCTRL_RT2880
|
||||
bool "RT2800 pinctrl driver for RALINK/Mediatek SOCs"
|
||||
depends on RALINK
|
||||
select PINMUX
|
3
drivers/staging/mt7621-pinctrl/Makefile
Normal file
3
drivers/staging/mt7621-pinctrl/Makefile
Normal file
|
@ -0,0 +1,3 @@
|
|||
obj-$(CONFIG_PINCTRL_RT2880) += pinctrl-rt2880.o
|
||||
|
||||
ccflags-y += -I$(srctree)/drivers/pinctrl
|
6
drivers/staging/mt7621-pinctrl/TODO
Normal file
6
drivers/staging/mt7621-pinctrl/TODO
Normal file
|
@ -0,0 +1,6 @@
|
|||
|
||||
- general code review and cleanup
|
||||
- should probably be always selected by 'config RALINK'
|
||||
- ensure device-tree requirements are documented
|
||||
|
||||
Cc: NeilBrown <neil@brown.name>
|
472
drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
Normal file
472
drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c
Normal file
|
@ -0,0 +1,472 @@
|
|||
/*
|
||||
* 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 = kzalloc(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_kzalloc(p->dev, sizeof(char *) * p->group_count, 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_kzalloc(p->dev, sizeof(struct rt2880_pmx_func) * p->func_count, GFP_KERNEL);
|
||||
gpio_func.groups = devm_kzalloc(p->dev, sizeof(int) * p->group_count, 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_kzalloc(p->dev, sizeof(int) * p->func[i]->pin_count, 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_kzalloc(p->dev,sizeof(uint8_t) * p->max_pins,
|
||||
GFP_KERNEL);
|
||||
/* the pads needed to tell pinctrl about our pins */
|
||||
p->pads = devm_kzalloc(p->dev,
|
||||
sizeof(struct pinctrl_pin_desc) * p->max_pins,
|
||||
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",
|
||||
.owner = THIS_MODULE,
|
||||
.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);
|
Loading…
Reference in a new issue