linux/drivers/pinctrl/pinctrl-lantiq.c

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/*
* linux/drivers/pinctrl/pinctrl-lantiq.c
* based on linux/drivers/pinctrl/pinctrl-pxa3xx.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) 2012 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 "pinctrl-lantiq.h"
static int ltq_get_group_count(struct pinctrl_dev *pctrldev)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
return info->num_grps;
}
static const char *ltq_get_group_name(struct pinctrl_dev *pctrldev,
unsigned selector)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
if (selector >= info->num_grps)
return NULL;
return info->grps[selector].name;
}
static int ltq_get_group_pins(struct pinctrl_dev *pctrldev,
unsigned selector,
const unsigned **pins,
unsigned *num_pins)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
if (selector >= info->num_grps)
return -EINVAL;
*pins = info->grps[selector].pins;
*num_pins = info->grps[selector].npins;
return 0;
}
static void ltq_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
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 ltq_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned offset)
{
seq_printf(s, " %s", dev_name(pctldev->dev));
}
static void ltq_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
struct device_node *np,
struct pinctrl_map **map)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctldev);
struct property *pins = of_find_property(np, "lantiq,pins", NULL);
struct property *groups = of_find_property(np, "lantiq,groups", NULL);
unsigned long configs[3];
unsigned num_configs = 0;
struct property *prop;
const char *group, *pin;
const char *function;
int ret, i;
if (!pins && !groups) {
dev_err(pctldev->dev, "%s defines neither pins nor groups\n",
np->name);
return;
}
if (pins && groups) {
dev_err(pctldev->dev, "%s defines both pins and groups\n",
np->name);
return;
}
ret = of_property_read_string(np, "lantiq,function", &function);
if (groups && !ret) {
of_property_for_each_string(np, "lantiq,groups", prop, group) {
(*map)->type = PIN_MAP_TYPE_MUX_GROUP;
(*map)->name = function;
(*map)->data.mux.group = group;
(*map)->data.mux.function = function;
(*map)++;
}
}
for (i = 0; i < info->num_params; i++) {
u32 val;
int ret = of_property_read_u32(np,
info->params[i].property, &val);
if (!ret)
configs[num_configs++] =
LTQ_PINCONF_PACK(info->params[i].param,
val);
}
if (!num_configs)
return;
of_property_for_each_string(np, "lantiq,pins", prop, pin) {
(*map)->data.configs.configs = kmemdup(configs,
num_configs * sizeof(unsigned long),
GFP_KERNEL);
(*map)->type = PIN_MAP_TYPE_CONFIGS_PIN;
(*map)->name = pin;
(*map)->data.configs.group_or_pin = pin;
(*map)->data.configs.num_configs = num_configs;
(*map)++;
}
of_property_for_each_string(np, "lantiq,groups", prop, group) {
(*map)->data.configs.configs = kmemdup(configs,
num_configs * sizeof(unsigned long),
GFP_KERNEL);
(*map)->type = PIN_MAP_TYPE_CONFIGS_GROUP;
(*map)->name = group;
(*map)->data.configs.group_or_pin = group;
(*map)->data.configs.num_configs = num_configs;
(*map)++;
}
}
static int ltq_pinctrl_dt_subnode_size(struct device_node *np)
{
int ret;
ret = of_property_count_strings(np, "lantiq,groups");
if (ret < 0)
ret = of_property_count_strings(np, "lantiq,pins");
return ret;
}
static int ltq_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map,
unsigned *num_maps)
{
struct pinctrl_map *tmp;
struct device_node *np;
int max_maps = 0;
for_each_child_of_node(np_config, np)
max_maps += ltq_pinctrl_dt_subnode_size(np);
*map = kzalloc(max_maps * sizeof(struct pinctrl_map) * 2, GFP_KERNEL);
if (!*map)
return -ENOMEM;
tmp = *map;
for_each_child_of_node(np_config, np)
ltq_pinctrl_dt_subnode_to_map(pctldev, np, &tmp);
*num_maps = ((int)(tmp - *map));
return 0;
}
static const struct pinctrl_ops ltq_pctrl_ops = {
.get_groups_count = ltq_get_group_count,
.get_group_name = ltq_get_group_name,
.get_group_pins = ltq_get_group_pins,
.pin_dbg_show = ltq_pinctrl_pin_dbg_show,
.dt_node_to_map = ltq_pinctrl_dt_node_to_map,
.dt_free_map = ltq_pinctrl_dt_free_map,
};
static int ltq_pmx_func_count(struct pinctrl_dev *pctrldev)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
return info->num_funcs;
}
static const char *ltq_pmx_func_name(struct pinctrl_dev *pctrldev,
unsigned selector)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
if (selector >= info->num_funcs)
return NULL;
return info->funcs[selector].name;
}
static int ltq_pmx_get_groups(struct pinctrl_dev *pctrldev,
unsigned func,
const char * const **groups,
unsigned * const num_groups)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
*groups = info->funcs[func].groups;
*num_groups = info->funcs[func].num_groups;
return 0;
}
/* Return function number. If failure, return negative value. */
static int match_mux(const struct ltq_mfp_pin *mfp, unsigned mux)
{
int i;
for (i = 0; i < LTQ_MAX_MUX; i++) {
if (mfp->func[i] == mux)
break;
}
if (i >= LTQ_MAX_MUX)
return -EINVAL;
return i;
}
/* dont assume .mfp is linearly mapped. find the mfp with the correct .pin */
static int match_mfp(const struct ltq_pinmux_info *info, int pin)
{
int i;
for (i = 0; i < info->num_mfp; i++) {
if (info->mfp[i].pin == pin)
return i;
}
return -1;
}
/* check whether current pin configuration is valid. Negative for failure */
static int match_group_mux(const struct ltq_pin_group *grp,
const struct ltq_pinmux_info *info,
unsigned mux)
{
int i, pin, ret = 0;
for (i = 0; i < grp->npins; i++) {
pin = match_mfp(info, grp->pins[i]);
if (pin < 0) {
dev_err(info->dev, "could not find mfp for pin %d\n",
grp->pins[i]);
return -EINVAL;
}
ret = match_mux(&info->mfp[pin], mux);
if (ret < 0) {
dev_err(info->dev, "Can't find mux %d on pin%d\n",
mux, pin);
break;
}
}
return ret;
}
static int ltq_pmx_enable(struct pinctrl_dev *pctrldev,
unsigned func,
unsigned group)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
const struct ltq_pin_group *pin_grp = &info->grps[group];
int i, pin, pin_func, ret;
if (!pin_grp->npins ||
(match_group_mux(pin_grp, info, pin_grp->mux) < 0)) {
dev_err(info->dev, "Failed to set the pin group: %s\n",
info->grps[group].name);
return -EINVAL;
}
for (i = 0; i < pin_grp->npins; i++) {
pin = match_mfp(info, pin_grp->pins[i]);
if (pin < 0) {
dev_err(info->dev, "could not find mfp for pin %d\n",
pin_grp->pins[i]);
return -EINVAL;
}
pin_func = match_mux(&info->mfp[pin], pin_grp->mux);
ret = info->apply_mux(pctrldev, pin, pin_func);
if (ret) {
dev_err(info->dev,
"failed to apply mux %d for pin %d\n",
pin_func, pin);
return ret;
}
}
return 0;
}
static int ltq_pmx_gpio_request_enable(struct pinctrl_dev *pctrldev,
struct pinctrl_gpio_range *range,
unsigned pin)
{
struct ltq_pinmux_info *info = pinctrl_dev_get_drvdata(pctrldev);
int mfp = match_mfp(info, pin);
int pin_func;
if (mfp < 0) {
dev_err(info->dev, "could not find mfp for pin %d\n", pin);
return -EINVAL;
}
pin_func = match_mux(&info->mfp[mfp], 0);
if (pin_func < 0) {
dev_err(info->dev, "No GPIO function on pin%d\n", mfp);
return -EINVAL;
}
return info->apply_mux(pctrldev, mfp, pin_func);
}
static const struct pinmux_ops ltq_pmx_ops = {
.get_functions_count = ltq_pmx_func_count,
.get_function_name = ltq_pmx_func_name,
.get_function_groups = ltq_pmx_get_groups,
.enable = ltq_pmx_enable,
.gpio_request_enable = ltq_pmx_gpio_request_enable,
};
/*
* allow different socs to register with the generic part of the lanti
* pinctrl code
*/
int ltq_pinctrl_register(struct platform_device *pdev,
struct ltq_pinmux_info *info)
{
struct pinctrl_desc *desc;
if (!info)
return -EINVAL;
desc = info->desc;
desc->pctlops = &ltq_pctrl_ops;
desc->pmxops = &ltq_pmx_ops;
info->dev = &pdev->dev;
info->pctrl = pinctrl_register(desc, &pdev->dev, info);
if (!info->pctrl) {
dev_err(&pdev->dev, "failed to register LTQ pinmux driver\n");
return -EINVAL;
}
platform_set_drvdata(pdev, info);
return 0;
}