/*
* Pinctrl driver for the Toumaz Xenif TZ1090 PowerDown Controller pins
*
* Copyright (c) 2013, Imagination Technologies Ltd.
*
* Derived from Tegra code:
* Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
*
* Derived from code:
* Copyright (C) 2010 Google, Inc.
* Copyright (C) 2010 NVIDIA Corporation
* Copyright (C) 2009-2011 ST-Ericsson AB
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.h>
/*
* The registers may be shared with other threads/cores, so we need to use the
* metag global lock2 for atomicity.
*/
#include <asm/global_lock.h>
#include "core.h"
#include "pinconf.h"
/* Register offsets from bank base address */
#define REG_GPIO_CONTROL0 0x00
#define REG_GPIO_CONTROL2 0x08
/* Register field information */
#define REG_GPIO_CONTROL2_PU_PD_S 16
#define REG_GPIO_CONTROL2_PDC_POS_S 4
#define REG_GPIO_CONTROL2_PDC_DR_S 2
#define REG_GPIO_CONTROL2_PDC_SR_S 1
#define REG_GPIO_CONTROL2_PDC_SCHMITT_S 0
/* PU_PD field values */
#define REG_PU_PD_TRISTATE 0
#define REG_PU_PD_UP 1
#define REG_PU_PD_DOWN 2
#define REG_PU_PD_REPEATER 3
/* DR field values */
#define REG_DR_2mA 0
#define REG_DR_4mA 1
#define REG_DR_8mA 2
#define REG_DR_12mA 3
/**
* struct tz1090_pdc_function - TZ1090 PDC pinctrl mux function
* @name: The name of the function, exported to pinctrl core.
* @groups: An array of pin groups that may select this function.
* @ngroups: The number of entries in @groups.
*/
struct tz1090_pdc_function {
const char *name;
const char * const *groups;
unsigned int ngroups;
};
/**
* struct tz1090_pdc_pingroup - TZ1090 PDC pin group
* @name: Name of pin group.
* @pins: Array of pin numbers in this pin group.
* @npins: Number of pins in this pin group.
* @func: Function enabled by the mux.
* @reg: Mux register offset.
* @bit: Mux register bit.
* @drv: Drive control supported, otherwise it's a mux.
* This means Schmitt, Slew, and Drive strength.
*
* A representation of a group of pins (possibly just one pin) in the TZ1090
* PDC pin controller. Each group allows some parameter or parameters to be
* configured. The most common is mux function selection.
*/
struct tz1090_pdc_pingroup {
const char *name;
const unsigned int *pins;
unsigned int npins;
int func;
u16 reg;
u8 bit;
bool drv;
};
/*
* All PDC pins can be GPIOs. Define these first to match how the GPIO driver
* names/numbers its pins.
*/
enum tz1090_pdc_pin {
TZ1090_PDC_PIN_GPIO0,
TZ1090_PDC_PIN_GPIO1,
TZ1090_PDC_PIN_SYS_WAKE0,
TZ1090_PDC_PIN_SYS_WAKE1,
TZ1090_PDC_PIN_SYS_WAKE2,
TZ1090_PDC_PIN_IR_DATA,
TZ1090_PDC_PIN_EXT_POWER,
};
/* Pin names */
static const struct pinctrl_pin_desc tz1090_pdc_pins[] = {
/* PDC GPIOs */
PINCTRL_PIN(TZ1090_PDC_PIN_GPIO0, "gpio0"),
PINCTRL_PIN(TZ1090_PDC_PIN_GPIO1, "gpio1"),
PINCTRL_PIN(TZ1090_PDC_PIN_SYS_WAKE0, "sys_wake0"),
PINCTRL_PIN(TZ1090_PDC_PIN_SYS_WAKE1, "sys_wake1"),
PINCTRL_PIN(TZ1090_PDC_PIN_SYS_WAKE2, "sys_wake2"),
PINCTRL_PIN(TZ1090_PDC_PIN_IR_DATA, "ir_data"),
PINCTRL_PIN(TZ1090_PDC_PIN_EXT_POWER, "ext_power"),
};
/* Pin group pins */
static const unsigned int gpio0_pins[] = {
TZ1090_PDC_PIN_GPIO0,
};
static const unsigned int gpio1_pins[] = {
TZ1090_PDC_PIN_GPIO1,
};
static const unsigned int pdc_pins[] = {
TZ1090_PDC_PIN_GPIO0,
TZ1090_PDC_PIN_GPIO1,
TZ1090_PDC_PIN_SYS_WAKE0,
TZ1090_PDC_PIN_SYS_WAKE1,
TZ1090_PDC_PIN_SYS_WAKE2,
TZ1090_PDC_PIN_IR_DATA,
TZ1090_PDC_PIN_EXT_POWER,
};
/* Mux functions */
enum tz1090_pdc_mux {
/* PDC_GPIO0 mux */
TZ1090_PDC_MUX_IR_MOD_STABLE_OUT,
/* PDC_GPIO1 mux */
TZ1090_PDC_MUX_IR_MOD_POWER_OUT,
};
/* Pin groups a function can be muxed to */
static const char * const gpio0_groups[] = {
"gpio0",
};
static const char * const gpio1_groups[] = {
"gpio1",
};
#define FUNCTION(mux, fname, group) \
[(TZ1090_PDC_MUX_ ## mux)] = { \
.name = #fname, \
.groups = group##_groups, \
.ngroups = ARRAY_SIZE(group##_groups), \
}
/* Must correlate with enum tz1090_pdc_mux */
static const struct tz1090_pdc_function tz1090_pdc_functions[] = {
/* MUX fn pingroups */
FUNCTION(IR_MOD_STABLE_OUT, ir_mod_stable_out, gpio0),
FUNCTION(IR_MOD_POWER_OUT, ir_mod_power_out, gpio1),
};
/**
* MUX_PG() - Initialise a pin group with mux control
* @pg_name: Pin group name (stringified, _pins appended to get pins array)
* @f0: Function 0 (TZ1090_PDC_MUX_ is prepended)
* @mux_r: Mux register (REG_PINCTRL_ is prepended)
* @mux_b: Bit number in register of mux field
*/
#define MUX_PG(pg_name, f0, mux_r, mux_b) \
{ \
.name = #pg_name, \
.pins = pg_name##_pins, \
.npins = ARRAY_SIZE(pg_name##_pins), \
.func = TZ1090_PDC_MUX_ ## f0, \
.reg = (REG_ ## mux_r), \
.bit = (mux_b), \
}
/**
* DRV_PG() - Initialise a pin group with drive control
* @pg_name: Pin group name (stringified, _pins appended to get pins array)
*/
#define DRV_PG(pg_name) \
{ \
.name = #pg_name, \
.pins = pg_name##_pins, \
.npins = ARRAY_SIZE(pg_name##_pins), \
.drv = true, \
}
static const struct tz1090_pdc_pingroup tz1090_pdc_groups[] = {
/* Muxing pin groups */
/* pg_name, f0, mux register, mux bit */
MUX_PG(gpio0, IR_MOD_STABLE_OUT, GPIO_CONTROL0, 7),
MUX_PG(gpio1, IR_MOD_POWER_OUT, GPIO_CONTROL0, 6),
/* Drive pin groups */
/* pg_name */
DRV_PG(pdc),
};
/**
* struct tz1090_pdc_pmx - Private pinctrl data
* @dev: Platform device
* @pctl: Pin control device
* @regs: Register region
* @lock: Lock protecting coherency of mux_en and gpio_en
* @mux_en: Muxes that have been enabled
* @gpio_en: Muxable GPIOs that have been enabled
*/
struct tz1090_pdc_pmx {
struct device *dev;
struct pinctrl_dev *pctl;
void __iomem *regs;
spinlock_t lock;
u32 mux_en;
u32 gpio_en;
};
static inline u32 pmx_read(struct tz1090_pdc_pmx *pmx, u32 reg)
{
return ioread32(pmx->regs + reg);
}
static inline void pmx_write(struct tz1090_pdc_pmx *pmx, u32 val, u32 reg)
{
iowrite32(val, pmx->regs + reg);
}
/*
* Pin control operations
*/
static int tz1090_pdc_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(tz1090_pdc_groups);
}
static const char *tz1090_pdc_pinctrl_get_group_name(struct pinctrl_dev *pctl,
unsigned int group)
{
return tz1090_pdc_groups[group].name;
}
static int tz1090_pdc_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int group,
const unsigned int **pins,
unsigned int *num_pins)
{
*pins = tz1090_pdc_groups[group].pins;
*num_pins = tz1090_pdc_groups[group].npins;
return 0;
}
#ifdef CONFIG_DEBUG_FS
static void tz1090_pdc_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned int offset)
{
seq_printf(s, " %s", dev_name(pctldev->dev));
}
#endif
static int reserve_map(struct device *dev, struct pinctrl_map **map,
unsigned int *reserved_maps, unsigned int *num_maps,
unsigned int reserve)
{
unsigned int old_num = *reserved_maps;
unsigned int 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) {
dev_err(dev, "krealloc(map) failed\n");
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 int *reserved_maps,
unsigned int *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;
}
/**
* get_group_selector() - returns the group selector for a group
* @pin_group: the pin group to look up
*
* This is the same as pinctrl_get_group_selector except it doesn't produce an
* error message if the group isn't found or debug messages.
*/
static int get_group_selector(const char *pin_group)
{
unsigned int group;
for (group = 0; group < ARRAY_SIZE(tz1090_pdc_groups); ++group)
if (!strcmp(tz1090_pdc_groups[group].name, pin_group))
return group;
return -EINVAL;
}
static int add_map_configs(struct device *dev,
struct pinctrl_map **map,
unsigned int *reserved_maps, unsigned int *num_maps,
const char *group, unsigned long *configs,
unsigned int num_configs)
{
unsigned long *dup_configs;
enum pinctrl_map_type type;
if (WARN_ON(*num_maps == *reserved_maps))
return -ENOSPC;
dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
GFP_KERNEL);
if (!dup_configs) {
dev_err(dev, "kmemdup(configs) failed\n");
return -ENOMEM;
}
/*
* We support both pins and pin groups, but we need to figure out which
* one we have.
*/
if (get_group_selector(group) >= 0)
type = PIN_MAP_TYPE_CONFIGS_GROUP;
else
type = PIN_MAP_TYPE_CONFIGS_PIN;
(*map)[*num_maps].type = type;
(*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 void tz1090_pdc_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
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_GROUP)
kfree(map[i].data.configs.configs);
kfree(map);
}
static int tz1090_pdc_pinctrl_dt_subnode_to_map(struct device *dev,
struct device_node *np,
struct pinctrl_map **map,
unsigned int *reserved_maps,
unsigned int *num_maps)
{
int ret;
const char *function;
unsigned long *configs = NULL;
unsigned int num_configs = 0;
unsigned int reserve;
struct property *prop;
const char *group;
ret = of_property_read_string(np, "tz1090,function", &function);
if (ret < 0) {
/* EINVAL=missing, which is fine since it's optional */
if (ret != -EINVAL)
dev_err(dev,
"could not parse property function\n");
function = NULL;
}
ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
if (ret)
return ret;
reserve = 0;
if (function != NULL)
reserve++;
if (num_configs)
reserve++;
ret = of_property_count_strings(np, "tz1090,pins");
if (ret < 0) {
dev_err(dev, "could not parse property 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, "tz1090,pins", prop, group) {
if (function) {
ret = add_map_mux(map, reserved_maps, num_maps,
group, function);
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 tz1090_pdc_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map,
unsigned int *num_maps)
{
unsigned int reserved_maps;
struct device_node *np;
int ret;
reserved_maps = 0;
*map = NULL;
*num_maps = 0;
for_each_child_of_node(np_config, np) {
ret = tz1090_pdc_pinctrl_dt_subnode_to_map(pctldev->dev, np,
map, &reserved_maps,
num_maps);
if (ret < 0) {
tz1090_pdc_pinctrl_dt_free_map(pctldev, *map,
*num_maps);
return ret;
}
}
return 0;
}
static struct pinctrl_ops tz1090_pdc_pinctrl_ops = {
.get_groups_count = tz1090_pdc_pinctrl_get_groups_count,
.get_group_name = tz1090_pdc_pinctrl_get_group_name,
.get_group_pins = tz1090_pdc_pinctrl_get_group_pins,
#ifdef CONFIG_DEBUG_FS
.pin_dbg_show = tz1090_pdc_pinctrl_pin_dbg_show,
#endif
.dt_node_to_map = tz1090_pdc_pinctrl_dt_node_to_map,
.dt_free_map = tz1090_pdc_pinctrl_dt_free_map,
};
/*
* Pin mux operations
*/
static int tz1090_pdc_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(tz1090_pdc_functions);
}
static const char *tz1090_pdc_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
unsigned int function)
{
return tz1090_pdc_functions[function].name;
}
static int tz1090_pdc_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
unsigned int function,
const char * const **groups,
unsigned int * const num_groups)
{
*groups = tz1090_pdc_functions[function].groups;
*num_groups = tz1090_pdc_functions[function].ngroups;
return 0;
}
/**
* tz1090_pdc_pinctrl_mux() - update mux bit
* @pmx: Pinmux data
* @grp: Pin mux group
*/
static void tz1090_pdc_pinctrl_mux(struct tz1090_pdc_pmx *pmx,
const struct tz1090_pdc_pingroup *grp)
{
u32 reg, select;
unsigned int pin_shift = grp->pins[0];
unsigned long flags;
/* select = mux && !gpio */
select = ((pmx->mux_en & ~pmx->gpio_en) >> pin_shift) & 1;
/* set up the mux */
__global_lock2(flags);
reg = pmx_read(pmx, grp->reg);
reg &= ~BIT(grp->bit);
reg |= select << grp->bit;
pmx_write(pmx, reg, grp->reg);
__global_unlock2(flags);
}
static int tz1090_pdc_pinctrl_enable(struct pinctrl_dev *pctldev,
unsigned int function, unsigned int group)
{
struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
const struct tz1090_pdc_pingroup *grp = &tz1090_pdc_groups[group];
dev_dbg(pctldev->dev, "%s(func=%u (%s), group=%u (%s))\n",
__func__,
function, tz1090_pdc_functions[function].name,
group, tz1090_pdc_groups[group].name);
/* is it even a mux? */
if (grp->drv)
return -EINVAL;
/* does this group even control the function? */
if (function != grp->func)
return -EINVAL;
/* record the pin being muxed and update mux bit */
spin_lock(&pmx->lock);
pmx->mux_en |= BIT(grp->pins[0]);
tz1090_pdc_pinctrl_mux(pmx, grp);
spin_unlock(&pmx->lock);
return 0;
}
static const struct tz1090_pdc_pingroup *find_mux_group(
struct tz1090_pdc_pmx *pmx,
unsigned int pin)
{
const struct tz1090_pdc_pingroup *grp;
unsigned int group;
grp = tz1090_pdc_groups;
for (group = 0; group < ARRAY_SIZE(tz1090_pdc_groups); ++group, ++grp) {
/* only match muxes */
if (grp->drv)
continue;
/* with a matching pin */
if (grp->pins[0] == pin)
return grp;
}
return NULL;
}
static int tz1090_pdc_pinctrl_gpio_request_enable(
struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int pin)
{
struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
const struct tz1090_pdc_pingroup *grp = find_mux_group(pmx, pin);
if (grp) {
/* record the pin in GPIO use and update mux bit */
spin_lock(&pmx->lock);
pmx->gpio_en |= BIT(pin);
tz1090_pdc_pinctrl_mux(pmx, grp);
spin_unlock(&pmx->lock);
}
return 0;
}
static void tz1090_pdc_pinctrl_gpio_disable_free(
struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int pin)
{
struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
const struct tz1090_pdc_pingroup *grp = find_mux_group(pmx, pin);
if (grp) {
/* record the pin not in GPIO use and update mux bit */
spin_lock(&pmx->lock);
pmx->gpio_en &= ~BIT(pin);
tz1090_pdc_pinctrl_mux(pmx, grp);
spin_unlock(&pmx->lock);
}
}
static struct pinmux_ops tz1090_pdc_pinmux_ops = {
.get_functions_count = tz1090_pdc_pinctrl_get_funcs_count,
.get_function_name = tz1090_pdc_pinctrl_get_func_name,
.get_function_groups = tz1090_pdc_pinctrl_get_func_groups,
.enable = tz1090_pdc_pinctrl_enable,
.gpio_request_enable = tz1090_pdc_pinctrl_gpio_request_enable,
.gpio_disable_free = tz1090_pdc_pinctrl_gpio_disable_free,
};
/*
* Pin config operations
*/
static int tz1090_pdc_pinconf_reg(struct pinctrl_dev *pctldev,
unsigned int pin,
enum pin_config_param param,
bool report_err,
u32 *reg, u32 *width, u32 *mask, u32 *shift,
u32 *val)
{
/* Find information about parameter's register */
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
*val = REG_PU_PD_TRISTATE;
break;
case PIN_CONFIG_BIAS_PULL_UP:
*val = REG_PU_PD_UP;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
*val = REG_PU_PD_DOWN;
break;
case PIN_CONFIG_BIAS_BUS_HOLD:
*val = REG_PU_PD_REPEATER;
break;
default:
return -ENOTSUPP;
};
/* Only input bias parameters supported */
*reg = REG_GPIO_CONTROL2;
*shift = REG_GPIO_CONTROL2_PU_PD_S + pin*2;
*width = 2;
/* Calculate field information */
*mask = (BIT(*width) - 1) << *shift;
return 0;
}
static int tz1090_pdc_pinconf_get(struct pinctrl_dev *pctldev,
unsigned int pin, unsigned long *config)
{
struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
int ret;
u32 reg, width, mask, shift, val, tmp, arg;
/* Get register information */
ret = tz1090_pdc_pinconf_reg(pctldev, pin, param, true,
®, &width, &mask, &shift, &val);
if (ret < 0)
return ret;
/* Extract field from register */
tmp = pmx_read(pmx, reg);
arg = ((tmp & mask) >> shift) == val;
/* Config not active */
if (!arg)
return -EINVAL;
/* And pack config */
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int tz1090_pdc_pinconf_set(struct pinctrl_dev *pctldev,
unsigned int pin, unsigned long *configs,
unsigned num_configs)
{
struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param;
unsigned int arg;
int ret;
u32 reg, width, mask, shift, val, tmp;
unsigned long flags;
int i;
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
dev_dbg(pctldev->dev, "%s(pin=%s, config=%#lx)\n",
__func__, tz1090_pdc_pins[pin].name, configs[i]);
/* Get register information */
ret = tz1090_pdc_pinconf_reg(pctldev, pin, param, true,
®, &width, &mask, &shift, &val);
if (ret < 0)
return ret;
/* Unpack argument and range check it */
if (arg > 1) {
dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
__func__, arg);
return -EINVAL;
}
/* Write register field */
__global_lock2(flags);
tmp = pmx_read(pmx, reg);
tmp &= ~mask;
if (arg)
tmp |= val << shift;
pmx_write(pmx, tmp, reg);
__global_unlock2(flags);
} /* for each config */
return 0;
}
static const int tz1090_pdc_boolean_map[] = {
[0] = -EINVAL,
[1] = 1,
};
static const int tz1090_pdc_dr_map[] = {
[REG_DR_2mA] = 2,
[REG_DR_4mA] = 4,
[REG_DR_8mA] = 8,
[REG_DR_12mA] = 12,
};
static int tz1090_pdc_pinconf_group_reg(struct pinctrl_dev *pctldev,
const struct tz1090_pdc_pingroup *g,
enum pin_config_param param,
bool report_err, u32 *reg, u32 *width,
u32 *mask, u32 *shift, const int **map)
{
/* Drive configuration applies in groups, but not to all groups. */
if (!g->drv) {
if (report_err)
dev_dbg(pctldev->dev,
"%s: group %s has no drive control\n",
__func__, g->name);
return -ENOTSUPP;
}
/* Find information about drive parameter's register */
*reg = REG_GPIO_CONTROL2;
switch (param) {
case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
*shift = REG_GPIO_CONTROL2_PDC_SCHMITT_S;
*width = 1;
*map = tz1090_pdc_boolean_map;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
*shift = REG_GPIO_CONTROL2_PDC_DR_S;
*width = 2;
*map = tz1090_pdc_dr_map;
break;
case PIN_CONFIG_LOW_POWER_MODE:
*shift = REG_GPIO_CONTROL2_PDC_POS_S;
*width = 1;
*map = tz1090_pdc_boolean_map;
break;
default:
return -ENOTSUPP;
};
/* Calculate field information */
*mask = (BIT(*width) - 1) << *shift;
return 0;
}
static int tz1090_pdc_pinconf_group_get(struct pinctrl_dev *pctldev,
unsigned int group,
unsigned long *config)
{
struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
const struct tz1090_pdc_pingroup *g = &tz1090_pdc_groups[group];
enum pin_config_param param = pinconf_to_config_param(*config);
int ret, arg;
u32 reg, width, mask, shift, val;
const int *map;
/* Get register information */
ret = tz1090_pdc_pinconf_group_reg(pctldev, g, param, true,
®, &width, &mask, &shift, &map);
if (ret < 0)
return ret;
/* Extract field from register */
val = pmx_read(pmx, reg);
arg = map[(val & mask) >> shift];
if (arg < 0)
return arg;
/* And pack config */
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int tz1090_pdc_pinconf_group_set(struct pinctrl_dev *pctldev,
unsigned int group,
unsigned long *configs,
unsigned num_configs)
{
struct tz1090_pdc_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
const struct tz1090_pdc_pingroup *g = &tz1090_pdc_groups[group];
enum pin_config_param param;
const unsigned int *pit;
unsigned int i;
int ret, arg;
u32 reg, width, mask, shift, val;
unsigned long flags;
const int *map;
int j;
for (j = 0; j < num_configs; j++) {
param = pinconf_to_config_param(configs[j]);
dev_dbg(pctldev->dev, "%s(group=%s, config=%#lx)\n",
__func__, g->name, configs[j]);
/* Get register information */
ret = tz1090_pdc_pinconf_group_reg(pctldev, g, param, true,
®, &width, &mask, &shift,
&map);
if (ret < 0) {
/*
* Maybe we're trying to set a per-pin configuration
* of a group, so do the pins one by one. This is
* mainly as a convenience.
*/
for (i = 0, pit = g->pins; i < g->npins; ++i, ++pit) {
ret = tz1090_pdc_pinconf_set(pctldev, *pit,
configs, num_configs);
if (ret)
return ret;
}
return 0;
}
/* Unpack argument and map it to register value */
arg = pinconf_to_config_argument(configs[j]);
for (i = 0; i < BIT(width); ++i) {
if (map[i] == arg || (map[i] == -EINVAL && !arg)) {
/* Write register field */
__global_lock2(flags);
val = pmx_read(pmx, reg);
val &= ~mask;
val |= i << shift;
pmx_write(pmx, val, reg);
__global_unlock2(flags);
goto next_config;
}
}
dev_dbg(pctldev->dev, "%s: arg %u not supported\n",
__func__, arg);
return 0;
next_config:
;
} /* for each config */
return 0;
}
static struct pinconf_ops tz1090_pdc_pinconf_ops = {
.is_generic = true,
.pin_config_get = tz1090_pdc_pinconf_get,
.pin_config_set = tz1090_pdc_pinconf_set,
.pin_config_group_get = tz1090_pdc_pinconf_group_get,
.pin_config_group_set = tz1090_pdc_pinconf_group_set,
.pin_config_config_dbg_show = pinconf_generic_dump_config,
};
/*
* Pin control driver setup
*/
static struct pinctrl_desc tz1090_pdc_pinctrl_desc = {
.pctlops = &tz1090_pdc_pinctrl_ops,
.pmxops = &tz1090_pdc_pinmux_ops,
.confops = &tz1090_pdc_pinconf_ops,
.owner = THIS_MODULE,
};
static int tz1090_pdc_pinctrl_probe(struct platform_device *pdev)
{
struct tz1090_pdc_pmx *pmx;
struct resource *res;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx) {
dev_err(&pdev->dev, "Can't alloc tz1090_pdc_pmx\n");
return -ENOMEM;
}
pmx->dev = &pdev->dev;
spin_lock_init(&pmx->lock);
tz1090_pdc_pinctrl_desc.name = dev_name(&pdev->dev);
tz1090_pdc_pinctrl_desc.pins = tz1090_pdc_pins;
tz1090_pdc_pinctrl_desc.npins = ARRAY_SIZE(tz1090_pdc_pins);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pmx->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pmx->regs))
return PTR_ERR(pmx->regs);
pmx->pctl = pinctrl_register(&tz1090_pdc_pinctrl_desc, &pdev->dev, pmx);
if (!pmx->pctl) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
return -ENODEV;
}
platform_set_drvdata(pdev, pmx);
dev_info(&pdev->dev, "TZ1090 PDC pinctrl driver initialised\n");
return 0;
}
static int tz1090_pdc_pinctrl_remove(struct platform_device *pdev)
{
struct tz1090_pdc_pmx *pmx = platform_get_drvdata(pdev);
pinctrl_unregister(pmx->pctl);
return 0;
}
static struct of_device_id tz1090_pdc_pinctrl_of_match[] = {
{ .compatible = "img,tz1090-pdc-pinctrl", },
{ },
};
static struct platform_driver tz1090_pdc_pinctrl_driver = {
.driver = {
.name = "tz1090-pdc-pinctrl",
.owner = THIS_MODULE,
.of_match_table = tz1090_pdc_pinctrl_of_match,
},
.probe = tz1090_pdc_pinctrl_probe,
.remove = tz1090_pdc_pinctrl_remove,
};
static int __init tz1090_pdc_pinctrl_init(void)
{
return platform_driver_register(&tz1090_pdc_pinctrl_driver);
}
arch_initcall(tz1090_pdc_pinctrl_init);
static void __exit tz1090_pdc_pinctrl_exit(void)
{
platform_driver_unregister(&tz1090_pdc_pinctrl_driver);
}
module_exit(tz1090_pdc_pinctrl_exit);
MODULE_AUTHOR("Imagination Technologies Ltd.");
MODULE_DESCRIPTION("Toumaz Xenif TZ1090 PDC pinctrl driver");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, tz1090_pdc_pinctrl_of_match);
