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pinctrl-samsung.c
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pinctrl-samsung.c
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// SPDX-License-Identifier: GPL-2.0+
//
// pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
//
// Copyright (c) 2012 Samsung Electronics Co., Ltd.
// http://www.samsung.com
// Copyright (c) 2012 Linaro Ltd
// http://www.linaro.org
//
// Author: Thomas Abraham <thomas.ab@samsung.com>
//
// This driver implements the Samsung pinctrl driver. It supports setting up of
// pinmux and pinconf configurations. The gpiolib interface is also included.
// External interrupt (gpio and wakeup) support are not included in this driver
// but provides extensions to which platform specific implementation of the gpio
// and wakeup interrupts can be hooked to.
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/irqdomain.h>
#include <linux/of_device.h>
#include <linux/spinlock.h>
#include <dt-bindings/pinctrl/samsung.h>
#include "../core.h"
#include "pinctrl-samsung.h"
/* maximum number of the memory resources */
#define SAMSUNG_PINCTRL_NUM_RESOURCES 2
/* list of all possible config options supported */
static struct pin_config {
const char *property;
enum pincfg_type param;
} cfg_params[] = {
{ "samsung,pin-pud", PINCFG_TYPE_PUD },
{ "samsung,pin-drv", PINCFG_TYPE_DRV },
{ "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
{ "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
{ "samsung,pin-val", PINCFG_TYPE_DAT },
};
static unsigned int pin_base;
static int samsung_get_group_count(struct pinctrl_dev *pctldev)
{
struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->nr_groups;
}
static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
return pmx->pin_groups[group].name;
}
static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group,
const unsigned **pins,
unsigned *num_pins)
{
struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
*pins = pmx->pin_groups[group].pins;
*num_pins = pmx->pin_groups[group].num_pins;
return 0;
}
static int reserve_map(struct device *dev, struct pinctrl_map **map,
unsigned *reserved_maps, unsigned *num_maps,
unsigned reserve)
{
unsigned old_num = *reserved_maps;
unsigned new_num = *num_maps + reserve;
struct pinctrl_map *new_map;
if (old_num >= new_num)
return 0;
new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
if (!new_map)
return -ENOMEM;
memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
*map = new_map;
*reserved_maps = new_num;
return 0;
}
static int add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
unsigned *num_maps, const char *group,
const char *function)
{
if (WARN_ON(*num_maps == *reserved_maps))
return -ENOSPC;
(*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
(*map)[*num_maps].data.mux.group = group;
(*map)[*num_maps].data.mux.function = function;
(*num_maps)++;
return 0;
}
static int add_map_configs(struct device *dev, struct pinctrl_map **map,
unsigned *reserved_maps, unsigned *num_maps,
const char *group, unsigned long *configs,
unsigned num_configs)
{
unsigned long *dup_configs;
if (WARN_ON(*num_maps == *reserved_maps))
return -ENOSPC;
dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
GFP_KERNEL);
if (!dup_configs)
return -ENOMEM;
(*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
(*map)[*num_maps].data.configs.group_or_pin = group;
(*map)[*num_maps].data.configs.configs = dup_configs;
(*map)[*num_maps].data.configs.num_configs = num_configs;
(*num_maps)++;
return 0;
}
static int add_config(struct device *dev, unsigned long **configs,
unsigned *num_configs, unsigned long config)
{
unsigned old_num = *num_configs;
unsigned new_num = old_num + 1;
unsigned long *new_configs;
new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
GFP_KERNEL);
if (!new_configs)
return -ENOMEM;
new_configs[old_num] = config;
*configs = new_configs;
*num_configs = new_num;
return 0;
}
static void samsung_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_GROUP)
kfree(map[i].data.configs.configs);
kfree(map);
}
static int samsung_dt_subnode_to_map(struct samsung_pinctrl_drv_data *drvdata,
struct device *dev,
struct device_node *np,
struct pinctrl_map **map,
unsigned *reserved_maps,
unsigned *num_maps)
{
int ret, i;
u32 val;
unsigned long config;
unsigned long *configs = NULL;
unsigned num_configs = 0;
unsigned reserve;
struct property *prop;
const char *group;
bool has_func = false;
ret = of_property_read_u32(np, "samsung,pin-function", &val);
if (!ret)
has_func = true;
for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
ret = of_property_read_u32(np, cfg_params[i].property, &val);
if (!ret) {
config = PINCFG_PACK(cfg_params[i].param, val);
ret = add_config(dev, &configs, &num_configs, config);
if (ret < 0)
goto exit;
/* EINVAL=missing, which is fine since it's optional */
} else if (ret != -EINVAL) {
dev_err(dev, "could not parse property %s\n",
cfg_params[i].property);
}
}
reserve = 0;
if (has_func)
reserve++;
if (num_configs)
reserve++;
ret = of_property_count_strings(np, "samsung,pins");
if (ret < 0) {
dev_err(dev, "could not parse property samsung,pins\n");
goto exit;
}
reserve *= ret;
ret = reserve_map(dev, map, reserved_maps, num_maps, reserve);
if (ret < 0)
goto exit;
of_property_for_each_string(np, "samsung,pins", prop, group) {
if (has_func) {
ret = add_map_mux(map, reserved_maps,
num_maps, group, np->full_name);
if (ret < 0)
goto exit;
}
if (num_configs) {
ret = add_map_configs(dev, map, reserved_maps,
num_maps, group, configs,
num_configs);
if (ret < 0)
goto exit;
}
}
ret = 0;
exit:
kfree(configs);
return ret;
}
static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map,
unsigned *num_maps)
{
struct samsung_pinctrl_drv_data *drvdata;
unsigned reserved_maps;
struct device_node *np;
int ret;
drvdata = pinctrl_dev_get_drvdata(pctldev);
reserved_maps = 0;
*map = NULL;
*num_maps = 0;
if (!of_get_child_count(np_config))
return samsung_dt_subnode_to_map(drvdata, pctldev->dev,
np_config, map,
&reserved_maps,
num_maps);
for_each_child_of_node(np_config, np) {
ret = samsung_dt_subnode_to_map(drvdata, pctldev->dev, np, map,
&reserved_maps, num_maps);
if (ret < 0) {
samsung_dt_free_map(pctldev, *map, *num_maps);
of_node_put(np);
return ret;
}
}
return 0;
}
#ifdef CONFIG_DEBUG_FS
/* Forward declaration which can be used by samsung_pin_dbg_show */
static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config);
static const char * const reg_names[] = {"CON", "DAT", "PUD", "DRV", "CON_PDN",
"PUD_PDN"};
static void samsung_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned int pin)
{
enum pincfg_type cfg_type;
unsigned long config;
int ret;
for (cfg_type = 0; cfg_type < PINCFG_TYPE_NUM; cfg_type++) {
config = PINCFG_PACK(cfg_type, 0);
ret = samsung_pinconf_get(pctldev, pin, &config);
if (ret < 0)
continue;
seq_printf(s, " %s(0x%lx)", reg_names[cfg_type],
PINCFG_UNPACK_VALUE(config));
}
}
#endif
/* list of pinctrl callbacks for the pinctrl core */
static const struct pinctrl_ops samsung_pctrl_ops = {
.get_groups_count = samsung_get_group_count,
.get_group_name = samsung_get_group_name,
.get_group_pins = samsung_get_group_pins,
.dt_node_to_map = samsung_dt_node_to_map,
.dt_free_map = samsung_dt_free_map,
#ifdef CONFIG_DEBUG_FS
.pin_dbg_show = samsung_pin_dbg_show,
#endif
};
/* check if the selector is a valid pin function selector */
static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
return drvdata->nr_functions;
}
/* return the name of the pin function specified */
static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
return drvdata->pmx_functions[selector].name;
}
/* return the groups associated for the specified function selector */
static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
unsigned selector, const char * const **groups,
unsigned * const num_groups)
{
struct samsung_pinctrl_drv_data *drvdata;
drvdata = pinctrl_dev_get_drvdata(pctldev);
*groups = drvdata->pmx_functions[selector].groups;
*num_groups = drvdata->pmx_functions[selector].num_groups;
return 0;
}
/*
* given a pin number that is local to a pin controller, find out the pin bank
* and the register base of the pin bank.
*/
static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
unsigned pin, void __iomem **reg, u32 *offset,
struct samsung_pin_bank **bank)
{
struct samsung_pin_bank *b;
b = drvdata->pin_banks;
while ((pin >= b->pin_base) &&
((b->pin_base + b->nr_pins - 1) < pin))
b++;
*reg = b->pctl_base + b->pctl_offset;
*offset = pin - b->pin_base;
if (bank)
*bank = b;
}
/* enable or disable a pinmux function */
static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
unsigned group)
{
struct samsung_pinctrl_drv_data *drvdata;
const struct samsung_pin_bank_type *type;
struct samsung_pin_bank *bank;
void __iomem *reg;
u32 mask, shift, data, pin_offset;
unsigned long flags;
const struct samsung_pmx_func *func;
const struct samsung_pin_group *grp;
drvdata = pinctrl_dev_get_drvdata(pctldev);
func = &drvdata->pmx_functions[selector];
grp = &drvdata->pin_groups[group];
pin_to_reg_bank(drvdata, grp->pins[0] - drvdata->pin_base,
®, &pin_offset, &bank);
type = bank->type;
mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
if (shift >= 32) {
/* Some banks have two config registers */
shift -= 32;
reg += 4;
}
raw_spin_lock_irqsave(&bank->slock, flags);
data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
data &= ~(mask << shift);
data |= func->val << shift;
writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
raw_spin_unlock_irqrestore(&bank->slock, flags);
}
/* enable a specified pinmux by writing to registers */
static int samsung_pinmux_set_mux(struct pinctrl_dev *pctldev,
unsigned selector,
unsigned group)
{
samsung_pinmux_setup(pctldev, selector, group);
return 0;
}
/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
static const struct pinmux_ops samsung_pinmux_ops = {
.get_functions_count = samsung_get_functions_count,
.get_function_name = samsung_pinmux_get_fname,
.get_function_groups = samsung_pinmux_get_groups,
.set_mux = samsung_pinmux_set_mux,
};
/* set or get the pin config settings for a specified pin */
static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config, bool set)
{
struct samsung_pinctrl_drv_data *drvdata;
const struct samsung_pin_bank_type *type;
struct samsung_pin_bank *bank;
void __iomem *reg_base;
enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
u32 data, width, pin_offset, mask, shift;
u32 cfg_value, cfg_reg;
unsigned long flags;
drvdata = pinctrl_dev_get_drvdata(pctldev);
pin_to_reg_bank(drvdata, pin - drvdata->pin_base, ®_base,
&pin_offset, &bank);
type = bank->type;
if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
return -EINVAL;
width = type->fld_width[cfg_type];
cfg_reg = type->reg_offset[cfg_type];
raw_spin_lock_irqsave(&bank->slock, flags);
mask = (1 << width) - 1;
shift = pin_offset * width;
data = readl(reg_base + cfg_reg);
if (set) {
cfg_value = PINCFG_UNPACK_VALUE(*config);
data &= ~(mask << shift);
data |= (cfg_value << shift);
writel(data, reg_base + cfg_reg);
} else {
data >>= shift;
data &= mask;
*config = PINCFG_PACK(cfg_type, data);
}
raw_spin_unlock_irqrestore(&bank->slock, flags);
return 0;
}
/* set the pin config settings for a specified pin */
static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned num_configs)
{
int i, ret;
for (i = 0; i < num_configs; i++) {
ret = samsung_pinconf_rw(pctldev, pin, &configs[i], true);
if (ret < 0)
return ret;
} /* for each config */
return 0;
}
/* get the pin config settings for a specified pin */
static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config)
{
return samsung_pinconf_rw(pctldev, pin, config, false);
}
/* set the pin config settings for a specified pin group */
static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
unsigned group, unsigned long *configs,
unsigned num_configs)
{
struct samsung_pinctrl_drv_data *drvdata;
const unsigned int *pins;
unsigned int cnt;
drvdata = pinctrl_dev_get_drvdata(pctldev);
pins = drvdata->pin_groups[group].pins;
for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
samsung_pinconf_set(pctldev, pins[cnt], configs, num_configs);
return 0;
}
/* get the pin config settings for a specified pin group */
static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
unsigned int group, unsigned long *config)
{
struct samsung_pinctrl_drv_data *drvdata;
const unsigned int *pins;
drvdata = pinctrl_dev_get_drvdata(pctldev);
pins = drvdata->pin_groups[group].pins;
samsung_pinconf_get(pctldev, pins[0], config);
return 0;
}
/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
static const struct pinconf_ops samsung_pinconf_ops = {
.pin_config_get = samsung_pinconf_get,
.pin_config_set = samsung_pinconf_set,
.pin_config_group_get = samsung_pinconf_group_get,
.pin_config_group_set = samsung_pinconf_group_set,
};
/*
* The samsung_gpio_set_vlaue() should be called with "bank->slock" held
* to avoid race condition.
*/
static void samsung_gpio_set_value(struct gpio_chip *gc,
unsigned offset, int value)
{
struct samsung_pin_bank *bank = gpiochip_get_data(gc);
const struct samsung_pin_bank_type *type = bank->type;
void __iomem *reg;
u32 data;
reg = bank->pctl_base + bank->pctl_offset;
data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
data &= ~(1 << offset);
if (value)
data |= 1 << offset;
writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
}
/* gpiolib gpio_set callback function */
static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
struct samsung_pin_bank *bank = gpiochip_get_data(gc);
unsigned long flags;
raw_spin_lock_irqsave(&bank->slock, flags);
samsung_gpio_set_value(gc, offset, value);
raw_spin_unlock_irqrestore(&bank->slock, flags);
}
/* gpiolib gpio_get callback function */
static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
{
void __iomem *reg;
u32 data;
struct samsung_pin_bank *bank = gpiochip_get_data(gc);
const struct samsung_pin_bank_type *type = bank->type;
reg = bank->pctl_base + bank->pctl_offset;
data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
data >>= offset;
data &= 1;
return data;
}
/*
* The samsung_gpio_set_direction() should be called with "bank->slock" held
* to avoid race condition.
* The calls to gpio_direction_output() and gpio_direction_input()
* leads to this function call.
*/
static int samsung_gpio_set_direction(struct gpio_chip *gc,
unsigned offset, bool input)
{
const struct samsung_pin_bank_type *type;
struct samsung_pin_bank *bank;
void __iomem *reg;
u32 data, mask, shift;
bank = gpiochip_get_data(gc);
type = bank->type;
reg = bank->pctl_base + bank->pctl_offset
+ type->reg_offset[PINCFG_TYPE_FUNC];
mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
shift = offset * type->fld_width[PINCFG_TYPE_FUNC];
if (shift >= 32) {
/* Some banks have two config registers */
shift -= 32;
reg += 4;
}
data = readl(reg);
data &= ~(mask << shift);
if (!input)
data |= EXYNOS_PIN_FUNC_OUTPUT << shift;
writel(data, reg);
return 0;
}
/* gpiolib gpio_direction_input callback function. */
static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct samsung_pin_bank *bank = gpiochip_get_data(gc);
unsigned long flags;
int ret;
raw_spin_lock_irqsave(&bank->slock, flags);
ret = samsung_gpio_set_direction(gc, offset, true);
raw_spin_unlock_irqrestore(&bank->slock, flags);
return ret;
}
/* gpiolib gpio_direction_output callback function. */
static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
int value)
{
struct samsung_pin_bank *bank = gpiochip_get_data(gc);
unsigned long flags;
int ret;
raw_spin_lock_irqsave(&bank->slock, flags);
samsung_gpio_set_value(gc, offset, value);
ret = samsung_gpio_set_direction(gc, offset, false);
raw_spin_unlock_irqrestore(&bank->slock, flags);
return ret;
}
/*
* gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
* and a virtual IRQ, if not already present.
*/
static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
struct samsung_pin_bank *bank = gpiochip_get_data(gc);
unsigned int virq;
if (!bank->irq_domain)
return -ENXIO;
virq = irq_create_mapping(bank->irq_domain, offset);
return (virq) ? : -ENXIO;
}
static struct samsung_pin_group *samsung_pinctrl_create_groups(
struct device *dev,
struct samsung_pinctrl_drv_data *drvdata,
unsigned int *cnt)
{
struct pinctrl_desc *ctrldesc = &drvdata->pctl;
struct samsung_pin_group *groups, *grp;
const struct pinctrl_pin_desc *pdesc;
int i;
groups = devm_kcalloc(dev, ctrldesc->npins, sizeof(*groups),
GFP_KERNEL);
if (!groups)
return ERR_PTR(-EINVAL);
grp = groups;
pdesc = ctrldesc->pins;
for (i = 0; i < ctrldesc->npins; ++i, ++pdesc, ++grp) {
grp->name = pdesc->name;
grp->pins = &pdesc->number;
grp->num_pins = 1;
}
*cnt = ctrldesc->npins;
return groups;
}
static int samsung_pinctrl_create_function(struct device *dev,
struct samsung_pinctrl_drv_data *drvdata,
struct device_node *func_np,
struct samsung_pmx_func *func)
{
int npins;
int ret;
int i;
if (of_property_read_u32(func_np, "samsung,pin-function", &func->val))
return 0;
npins = of_property_count_strings(func_np, "samsung,pins");
if (npins < 1) {
dev_err(dev, "invalid pin list in %pOFn node", func_np);
return -EINVAL;
}
func->name = func_np->full_name;
func->groups = devm_kcalloc(dev, npins, sizeof(char *), GFP_KERNEL);
if (!func->groups)
return -ENOMEM;
for (i = 0; i < npins; ++i) {
const char *gname;
ret = of_property_read_string_index(func_np, "samsung,pins",
i, &gname);
if (ret) {
dev_err(dev,
"failed to read pin name %d from %pOFn node\n",
i, func_np);
return ret;
}
func->groups[i] = gname;
}
func->num_groups = npins;
return 1;
}
static struct samsung_pmx_func *samsung_pinctrl_create_functions(
struct device *dev,
struct samsung_pinctrl_drv_data *drvdata,
unsigned int *cnt)
{
struct samsung_pmx_func *functions, *func;
struct device_node *dev_np = dev->of_node;
struct device_node *cfg_np;
unsigned int func_cnt = 0;
int ret;
/*
* Iterate over all the child nodes of the pin controller node
* and create pin groups and pin function lists.
*/
for_each_child_of_node(dev_np, cfg_np) {
struct device_node *func_np;
if (!of_get_child_count(cfg_np)) {
if (!of_find_property(cfg_np,
"samsung,pin-function", NULL))
continue;
++func_cnt;
continue;
}
for_each_child_of_node(cfg_np, func_np) {
if (!of_find_property(func_np,
"samsung,pin-function", NULL))
continue;
++func_cnt;
}
}
functions = devm_kcalloc(dev, func_cnt, sizeof(*functions),
GFP_KERNEL);
if (!functions)
return ERR_PTR(-ENOMEM);
func = functions;
/*
* Iterate over all the child nodes of the pin controller node
* and create pin groups and pin function lists.
*/
func_cnt = 0;
for_each_child_of_node(dev_np, cfg_np) {
struct device_node *func_np;
if (!of_get_child_count(cfg_np)) {
ret = samsung_pinctrl_create_function(dev, drvdata,
cfg_np, func);
if (ret < 0) {
of_node_put(cfg_np);
return ERR_PTR(ret);
}
if (ret > 0) {
++func;
++func_cnt;
}
continue;
}
for_each_child_of_node(cfg_np, func_np) {
ret = samsung_pinctrl_create_function(dev, drvdata,
func_np, func);
if (ret < 0) {
of_node_put(func_np);
of_node_put(cfg_np);
return ERR_PTR(ret);
}
if (ret > 0) {
++func;
++func_cnt;
}
}
}
*cnt = func_cnt;
return functions;
}
/*
* Parse the information about all the available pin groups and pin functions
* from device node of the pin-controller. A pin group is formed with all
* the pins listed in the "samsung,pins" property.
*/
static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
struct device *dev = &pdev->dev;
struct samsung_pin_group *groups;
struct samsung_pmx_func *functions;
unsigned int grp_cnt = 0, func_cnt = 0;
groups = samsung_pinctrl_create_groups(dev, drvdata, &grp_cnt);
if (IS_ERR(groups)) {
dev_err(dev, "failed to parse pin groups\n");
return PTR_ERR(groups);
}
functions = samsung_pinctrl_create_functions(dev, drvdata, &func_cnt);
if (IS_ERR(functions)) {
dev_err(dev, "failed to parse pin functions\n");
return PTR_ERR(functions);
}
drvdata->pin_groups = groups;
drvdata->nr_groups = grp_cnt;
drvdata->pmx_functions = functions;
drvdata->nr_functions = func_cnt;
return 0;
}
/* register the pinctrl interface with the pinctrl subsystem */
static int samsung_pinctrl_register(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
struct pinctrl_desc *ctrldesc = &drvdata->pctl;
struct pinctrl_pin_desc *pindesc, *pdesc;
struct samsung_pin_bank *pin_bank;
char *pin_names;
int pin, bank, ret;
ctrldesc->name = "samsung-pinctrl";
ctrldesc->owner = THIS_MODULE;
ctrldesc->pctlops = &samsung_pctrl_ops;
ctrldesc->pmxops = &samsung_pinmux_ops;
ctrldesc->confops = &samsung_pinconf_ops;
pindesc = devm_kcalloc(&pdev->dev,
drvdata->nr_pins, sizeof(*pindesc),
GFP_KERNEL);
if (!pindesc)
return -ENOMEM;
ctrldesc->pins = pindesc;
ctrldesc->npins = drvdata->nr_pins;
/* dynamically populate the pin number and pin name for pindesc */
for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
pdesc->number = pin + drvdata->pin_base;
/*
* allocate space for storing the dynamically generated names for all
* the pins which belong to this pin-controller.
*/
pin_names = devm_kzalloc(&pdev->dev,
array3_size(sizeof(char), PIN_NAME_LENGTH,
drvdata->nr_pins),
GFP_KERNEL);
if (!pin_names)
return -ENOMEM;
/* for each pin, the name of the pin is pin-bank name + pin number */
for (bank = 0; bank < drvdata->nr_banks; bank++) {
pin_bank = &drvdata->pin_banks[bank];
for (pin = 0; pin < pin_bank->nr_pins; pin++) {
sprintf(pin_names, "%s-%d", pin_bank->name, pin);
pdesc = pindesc + pin_bank->pin_base + pin;
pdesc->name = pin_names;
pin_names += PIN_NAME_LENGTH;
}
}
ret = samsung_pinctrl_parse_dt(pdev, drvdata);
if (ret)
return ret;
drvdata->pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc,
drvdata);
if (IS_ERR(drvdata->pctl_dev)) {
dev_err(&pdev->dev, "could not register pinctrl driver\n");
return PTR_ERR(drvdata->pctl_dev);
}
for (bank = 0; bank < drvdata->nr_banks; ++bank) {
pin_bank = &drvdata->pin_banks[bank];
pin_bank->grange.name = pin_bank->name;
pin_bank->grange.id = bank;
pin_bank->grange.pin_base = drvdata->pin_base
+ pin_bank->pin_base;
pin_bank->grange.base = pin_bank->grange.pin_base;
pin_bank->grange.npins = pin_bank->nr_pins;
pin_bank->grange.gc = &pin_bank->gpio_chip;
pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
}
return 0;
}
/* unregister the pinctrl interface with the pinctrl subsystem */
static int samsung_pinctrl_unregister(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
struct samsung_pin_bank *bank = drvdata->pin_banks;
int i;
for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
pinctrl_remove_gpio_range(drvdata->pctl_dev, &bank->grange);
return 0;
}
static const struct gpio_chip samsung_gpiolib_chip = {
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.set = samsung_gpio_set,
.get = samsung_gpio_get,
.direction_input = samsung_gpio_direction_input,
.direction_output = samsung_gpio_direction_output,
.to_irq = samsung_gpio_to_irq,
.owner = THIS_MODULE,
};
/* register the gpiolib interface with the gpiolib subsystem */
static int samsung_gpiolib_register(struct platform_device *pdev,
struct samsung_pinctrl_drv_data *drvdata)
{
struct samsung_pin_bank *bank = drvdata->pin_banks;
struct gpio_chip *gc;
int ret;
int i;
for (i = 0; i < drvdata->nr_banks; ++i, ++bank) {
bank->gpio_chip = samsung_gpiolib_chip;
gc = &bank->gpio_chip;
gc->base = bank->grange.base;
gc->ngpio = bank->nr_pins;
gc->parent = &pdev->dev;
gc->of_node = bank->of_node;
gc->label = bank->name;
ret = devm_gpiochip_add_data(&pdev->dev, gc, bank);
if (ret) {
dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
gc->label, ret);
return ret;
}
}
return 0;
}
static const struct samsung_pin_ctrl *
samsung_pinctrl_get_soc_data_for_of_alias(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const struct samsung_pinctrl_of_match_data *of_data;
int id;
id = of_alias_get_id(node, "pinctrl");
if (id < 0) {
dev_err(&pdev->dev, "failed to get alias id\n");
return NULL;
}
of_data = of_device_get_match_data(&pdev->dev);
if (id >= of_data->num_ctrl) {
dev_err(&pdev->dev, "invalid alias id %d\n", id);
return NULL;
}