- 根目录:
- drivers
- pinctrl
- pinctrl-abx500.c
/*
* Copyright (C) ST-Ericsson SA 2013
*
* Author: Patrice Chotard <patrice.chotard@st.com>
* License terms: GNU General Public License (GPL) version 2
*
* 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
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ab8500-gpio.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include "pinctrl-abx500.h"
/*
* The AB9540 and AB8540 GPIO support are extended versions
* of the AB8500 GPIO support.
* The AB9540 supports an additional (7th) register so that
* more GPIO may be configured and used.
* The AB8540 supports 4 new gpios (GPIOx_VBAT) that have
* internal pull-up and pull-down capabilities.
*/
/*
* GPIO registers offset
* Bank: 0x10
*/
#define AB8500_GPIO_SEL1_REG 0x00
#define AB8500_GPIO_SEL2_REG 0x01
#define AB8500_GPIO_SEL3_REG 0x02
#define AB8500_GPIO_SEL4_REG 0x03
#define AB8500_GPIO_SEL5_REG 0x04
#define AB8500_GPIO_SEL6_REG 0x05
#define AB9540_GPIO_SEL7_REG 0x06
#define AB8500_GPIO_DIR1_REG 0x10
#define AB8500_GPIO_DIR2_REG 0x11
#define AB8500_GPIO_DIR3_REG 0x12
#define AB8500_GPIO_DIR4_REG 0x13
#define AB8500_GPIO_DIR5_REG 0x14
#define AB8500_GPIO_DIR6_REG 0x15
#define AB9540_GPIO_DIR7_REG 0x16
#define AB8500_GPIO_OUT1_REG 0x20
#define AB8500_GPIO_OUT2_REG 0x21
#define AB8500_GPIO_OUT3_REG 0x22
#define AB8500_GPIO_OUT4_REG 0x23
#define AB8500_GPIO_OUT5_REG 0x24
#define AB8500_GPIO_OUT6_REG 0x25
#define AB9540_GPIO_OUT7_REG 0x26
#define AB8500_GPIO_PUD1_REG 0x30
#define AB8500_GPIO_PUD2_REG 0x31
#define AB8500_GPIO_PUD3_REG 0x32
#define AB8500_GPIO_PUD4_REG 0x33
#define AB8500_GPIO_PUD5_REG 0x34
#define AB8500_GPIO_PUD6_REG 0x35
#define AB9540_GPIO_PUD7_REG 0x36
#define AB8500_GPIO_IN1_REG 0x40
#define AB8500_GPIO_IN2_REG 0x41
#define AB8500_GPIO_IN3_REG 0x42
#define AB8500_GPIO_IN4_REG 0x43
#define AB8500_GPIO_IN5_REG 0x44
#define AB8500_GPIO_IN6_REG 0x45
#define AB9540_GPIO_IN7_REG 0x46
#define AB8540_GPIO_VINSEL_REG 0x47
#define AB8540_GPIO_PULL_UPDOWN_REG 0x48
#define AB8500_GPIO_ALTFUN_REG 0x50
#define AB8540_GPIO_PULL_UPDOWN_MASK 0x03
#define AB8540_GPIO_VINSEL_MASK 0x03
#define AB8540_GPIOX_VBAT_START 51
#define AB8540_GPIOX_VBAT_END 54
struct abx500_pinctrl {
struct device *dev;
struct pinctrl_dev *pctldev;
struct abx500_pinctrl_soc_data *soc;
struct gpio_chip chip;
struct ab8500 *parent;
struct mutex lock;
struct abx500_gpio_irq_cluster *irq_cluster;
int irq_cluster_size;
};
/**
* to_abx500_pinctrl() - get the pointer to abx500_pinctrl
* @chip: Member of the structure abx500_pinctrl
*/
static inline struct abx500_pinctrl *to_abx500_pinctrl(struct gpio_chip *chip)
{
return container_of(chip, struct abx500_pinctrl, chip);
}
static int abx500_gpio_get_bit(struct gpio_chip *chip, u8 reg,
unsigned offset, bool *bit)
{
struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
u8 pos = offset % 8;
u8 val;
int ret;
reg += offset / 8;
ret = abx500_get_register_interruptible(pct->dev,
AB8500_MISC, reg, &val);
*bit = !!(val & BIT(pos));
if (ret < 0)
dev_err(pct->dev,
"%s read reg =%x, offset=%x failed\n",
__func__, reg, offset);
return ret;
}
static int abx500_gpio_set_bits(struct gpio_chip *chip, u8 reg,
unsigned offset, int val)
{
struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
u8 pos = offset % 8;
int ret;
reg += offset / 8;
ret = abx500_mask_and_set_register_interruptible(pct->dev,
AB8500_MISC, reg, BIT(pos), val << pos);
if (ret < 0)
dev_err(pct->dev, "%s write failed\n", __func__);
return ret;
}
/**
* abx500_gpio_get() - Get the particular GPIO value
* @chip: Gpio device
* @offset: GPIO number to read
*/
static int abx500_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
bool bit;
int ret;
ret = abx500_gpio_get_bit(chip, AB8500_GPIO_IN1_REG,
offset, &bit);
if (ret < 0) {
dev_err(pct->dev, "%s failed\n", __func__);
return ret;
}
return bit;
}
static void abx500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
int ret;
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, val);
if (ret < 0)
dev_err(pct->dev, "%s write failed\n", __func__);
}
static int abx500_config_pull_updown(struct abx500_pinctrl *pct,
int offset, enum abx500_gpio_pull_updown val)
{
u8 pos;
int ret;
struct pullud *pullud;
if (!pct->soc->pullud) {
dev_err(pct->dev, "%s AB chip doesn't support pull up/down feature",
__func__);
ret = -EPERM;
goto out;
}
pullud = pct->soc->pullud;
if ((offset < pullud->first_pin)
|| (offset > pullud->last_pin)) {
ret = -EINVAL;
goto out;
}
pos = offset << 1;
ret = abx500_mask_and_set_register_interruptible(pct->dev,
AB8500_MISC, AB8540_GPIO_PULL_UPDOWN_REG,
AB8540_GPIO_PULL_UPDOWN_MASK << pos, val << pos);
out:
if (ret < 0)
dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
return ret;
}
static int abx500_gpio_direction_output(struct gpio_chip *chip,
unsigned offset,
int val)
{
struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
struct pullud *pullud = pct->soc->pullud;
unsigned gpio;
int ret;
/* set direction as output */
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 1);
if (ret < 0)
return ret;
/* disable pull down */
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_PUD1_REG, offset, 1);
if (ret < 0)
return ret;
/* if supported, disable both pull down and pull up */
gpio = offset + 1;
if (pullud && gpio >= pullud->first_pin && gpio <= pullud->last_pin) {
ret = abx500_config_pull_updown(pct,
gpio,
ABX500_GPIO_PULL_NONE);
if (ret < 0)
return ret;
}
/* set the output as 1 or 0 */
return abx500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, val);
}
static int abx500_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
/* set the register as input */
return abx500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 0);
}
static int abx500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
/* The AB8500 GPIO numbers are off by one */
int gpio = offset + 1;
int hwirq;
int i;
for (i = 0; i < pct->irq_cluster_size; i++) {
struct abx500_gpio_irq_cluster *cluster =
&pct->irq_cluster[i];
if (gpio >= cluster->start && gpio <= cluster->end) {
/*
* The ABx500 GPIO's associated IRQs are clustered together
* throughout the interrupt numbers at irregular intervals.
* To solve this quandry, we have placed the read-in values
* into the cluster information table.
*/
hwirq = gpio - cluster->start + cluster->to_irq;
return irq_create_mapping(pct->parent->domain, hwirq);
}
}
return -EINVAL;
}
static int abx500_set_mode(struct pinctrl_dev *pctldev, struct gpio_chip *chip,
unsigned gpio, int alt_setting)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
struct alternate_functions af = pct->soc->alternate_functions[gpio];
int ret;
int val;
unsigned offset;
const char *modes[] = {
[ABX500_DEFAULT] = "default",
[ABX500_ALT_A] = "altA",
[ABX500_ALT_B] = "altB",
[ABX500_ALT_C] = "altC",
};
/* sanity check */
if (((alt_setting == ABX500_ALT_A) && (af.gpiosel_bit == UNUSED)) ||
((alt_setting == ABX500_ALT_B) && (af.alt_bit1 == UNUSED)) ||
((alt_setting == ABX500_ALT_C) && (af.alt_bit2 == UNUSED))) {
dev_dbg(pct->dev, "pin %d doesn't support %s mode\n", gpio,
modes[alt_setting]);
return -EINVAL;
}
/* on ABx5xx, there is no GPIO0, so adjust the offset */
offset = gpio - 1;
switch (alt_setting) {
case ABX500_DEFAULT:
/*
* for ABx5xx family, default mode is always selected by
* writing 0 to GPIOSELx register, except for pins which
* support at least ALT_B mode, default mode is selected
* by writing 1 to GPIOSELx register
*/
val = 0;
if (af.alt_bit1 != UNUSED)
val++;
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
offset, val);
break;
case ABX500_ALT_A:
/*
* for ABx5xx family, alt_a mode is always selected by
* writing 1 to GPIOSELx register, except for pins which
* support at least ALT_B mode, alt_a mode is selected
* by writing 0 to GPIOSELx register and 0 in ALTFUNC
* register
*/
if (af.alt_bit1 != UNUSED) {
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
offset, 0);
ret = abx500_gpio_set_bits(chip,
AB8500_GPIO_ALTFUN_REG,
af.alt_bit1,
!!(af.alta_val && BIT(0)));
if (af.alt_bit2 != UNUSED)
ret = abx500_gpio_set_bits(chip,
AB8500_GPIO_ALTFUN_REG,
af.alt_bit2,
!!(af.alta_val && BIT(1)));
} else
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
offset, 1);
break;
case ABX500_ALT_B:
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
offset, 0);
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_ALTFUN_REG,
af.alt_bit1, !!(af.altb_val && BIT(0)));
if (af.alt_bit2 != UNUSED)
ret = abx500_gpio_set_bits(chip,
AB8500_GPIO_ALTFUN_REG,
af.alt_bit2,
!!(af.altb_val && BIT(1)));
break;
case ABX500_ALT_C:
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_SEL1_REG,
offset, 0);
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_ALTFUN_REG,
af.alt_bit2, !!(af.altc_val && BIT(0)));
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_ALTFUN_REG,
af.alt_bit2, !!(af.altc_val && BIT(1)));
break;
default:
dev_dbg(pct->dev, "unknow alt_setting %d\n", alt_setting);
return -EINVAL;
}
return ret;
}
static u8 abx500_get_mode(struct pinctrl_dev *pctldev, struct gpio_chip *chip,
unsigned gpio)
{
u8 mode;
bool bit_mode;
bool alt_bit1;
bool alt_bit2;
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
struct alternate_functions af = pct->soc->alternate_functions[gpio];
/* on ABx5xx, there is no GPIO0, so adjust the offset */
unsigned offset = gpio - 1;
/*
* if gpiosel_bit is set to unused,
* it means no GPIO or special case
*/
if (af.gpiosel_bit == UNUSED)
return ABX500_DEFAULT;
/* read GpioSelx register */
abx500_gpio_get_bit(chip, AB8500_GPIO_SEL1_REG + (offset / 8),
af.gpiosel_bit, &bit_mode);
mode = bit_mode;
/* sanity check */
if ((af.alt_bit1 < UNUSED) || (af.alt_bit1 > 7) ||
(af.alt_bit2 < UNUSED) || (af.alt_bit2 > 7)) {
dev_err(pct->dev,
"alt_bitX value not in correct range (-1 to 7)\n");
return -EINVAL;
}
/* if alt_bit2 is used, alt_bit1 must be used too */
if ((af.alt_bit2 != UNUSED) && (af.alt_bit1 == UNUSED)) {
dev_err(pct->dev,
"if alt_bit2 is used, alt_bit1 can't be unused\n");
return -EINVAL;
}
/* check if pin use AlternateFunction register */
if ((af.alt_bit1 == UNUSED) && (af.alt_bit2 == UNUSED))
return mode;
/*
* if pin GPIOSEL bit is set and pin supports alternate function,
* it means DEFAULT mode
*/
if (mode)
return ABX500_DEFAULT;
/*
* pin use the AlternatFunction register
* read alt_bit1 value
*/
abx500_gpio_get_bit(chip, AB8500_GPIO_ALTFUN_REG,
af.alt_bit1, &alt_bit1);
if (af.alt_bit2 != UNUSED)
/* read alt_bit2 value */
abx500_gpio_get_bit(chip, AB8500_GPIO_ALTFUN_REG, af.alt_bit2,
&alt_bit2);
else
alt_bit2 = 0;
mode = (alt_bit2 << 1) + alt_bit1;
if (mode == af.alta_val)
return ABX500_ALT_A;
else if (mode == af.altb_val)
return ABX500_ALT_B;
else
return ABX500_ALT_C;
}
#ifdef CONFIG_DEBUG_FS
#include <linux/seq_file.h>
static void abx500_gpio_dbg_show_one(struct seq_file *s,
struct pinctrl_dev *pctldev,
struct gpio_chip *chip,
unsigned offset, unsigned gpio)
{
const char *label = gpiochip_is_requested(chip, offset - 1);
u8 gpio_offset = offset - 1;
int mode = -1;
bool is_out;
bool pull;
const char *modes[] = {
[ABX500_DEFAULT] = "default",
[ABX500_ALT_A] = "altA",
[ABX500_ALT_B] = "altB",
[ABX500_ALT_C] = "altC",
};
abx500_gpio_get_bit(chip, AB8500_GPIO_DIR1_REG, gpio_offset, &is_out);
abx500_gpio_get_bit(chip, AB8500_GPIO_PUD1_REG, gpio_offset, &pull);
if (pctldev)
mode = abx500_get_mode(pctldev, chip, offset);
seq_printf(s, " gpio-%-3d (%-20.20s) %-3s %-9s %s",
gpio, label ?: "(none)",
is_out ? "out" : "in ",
is_out ?
(chip->get
? (chip->get(chip, offset) ? "hi" : "lo")
: "? ")
: (pull ? "pull up" : "pull down"),
(mode < 0) ? "unknown" : modes[mode]);
}
static void abx500_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
unsigned i;
unsigned gpio = chip->base;
struct abx500_pinctrl *pct = to_abx500_pinctrl(chip);
struct pinctrl_dev *pctldev = pct->pctldev;
for (i = 0; i < chip->ngpio; i++, gpio++) {
/* On AB8500, there is no GPIO0, the first is the GPIO 1 */
abx500_gpio_dbg_show_one(s, pctldev, chip, i + 1, gpio);
seq_printf(s, "\n");
}
}
#else
static inline void abx500_gpio_dbg_show_one(struct seq_file *s,
struct pinctrl_dev *pctldev,
struct gpio_chip *chip,
unsigned offset, unsigned gpio)
{
}
#define abx500_gpio_dbg_show NULL
#endif
static int abx500_gpio_request(struct gpio_chip *chip, unsigned offset)
{
int gpio = chip->base + offset;
return pinctrl_request_gpio(gpio);
}
static void abx500_gpio_free(struct gpio_chip *chip, unsigned offset)
{
int gpio = chip->base + offset;
pinctrl_free_gpio(gpio);
}
static struct gpio_chip abx500gpio_chip = {
.label = "abx500-gpio",
.owner = THIS_MODULE,
.request = abx500_gpio_request,
.free = abx500_gpio_free,
.direction_input = abx500_gpio_direction_input,
.get = abx500_gpio_get,
.direction_output = abx500_gpio_direction_output,
.set = abx500_gpio_set,
.to_irq = abx500_gpio_to_irq,
.dbg_show = abx500_gpio_dbg_show,
};
static int abx500_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
return pct->soc->nfunctions;
}
static const char *abx500_pmx_get_func_name(struct pinctrl_dev *pctldev,
unsigned function)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
return pct->soc->functions[function].name;
}
static int abx500_pmx_get_func_groups(struct pinctrl_dev *pctldev,
unsigned function,
const char * const **groups,
unsigned * const num_groups)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
*groups = pct->soc->functions[function].groups;
*num_groups = pct->soc->functions[function].ngroups;
return 0;
}
static int abx500_pmx_enable(struct pinctrl_dev *pctldev, unsigned function,
unsigned group)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
struct gpio_chip *chip = &pct->chip;
const struct abx500_pingroup *g;
int i;
int ret = 0;
g = &pct->soc->groups[group];
if (g->altsetting < 0)
return -EINVAL;
dev_dbg(pct->dev, "enable group %s, %u pins\n", g->name, g->npins);
for (i = 0; i < g->npins; i++) {
dev_dbg(pct->dev, "setting pin %d to altsetting %d\n",
g->pins[i], g->altsetting);
ret = abx500_set_mode(pctldev, chip, g->pins[i], g->altsetting);
}
return ret;
}
static void abx500_pmx_disable(struct pinctrl_dev *pctldev,
unsigned function, unsigned group)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
const struct abx500_pingroup *g;
g = &pct->soc->groups[group];
if (g->altsetting < 0)
return;
/* FIXME: poke out the mux, set the pin to some default state? */
dev_dbg(pct->dev, "disable group %s, %u pins\n", g->name, g->npins);
}
static int abx500_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
const struct abx500_pinrange *p;
int ret;
int i;
/*
* Different ranges have different ways to enable GPIO function on a
* pin, so refer back to our local range type, where we handily define
* what altfunc enables GPIO for a certain pin.
*/
for (i = 0; i < pct->soc->gpio_num_ranges; i++) {
p = &pct->soc->gpio_ranges[i];
if ((offset >= p->offset) &&
(offset < (p->offset + p->npins)))
break;
}
if (i == pct->soc->gpio_num_ranges) {
dev_err(pct->dev, "%s failed to locate range\n", __func__);
return -ENODEV;
}
dev_dbg(pct->dev, "enable GPIO by altfunc %d at gpio %d\n",
p->altfunc, offset);
ret = abx500_set_mode(pct->pctldev, &pct->chip,
offset, p->altfunc);
if (ret < 0) {
dev_err(pct->dev, "%s setting altfunc failed\n", __func__);
return ret;
}
return ret;
}
static void abx500_gpio_disable_free(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
}
static const struct pinmux_ops abx500_pinmux_ops = {
.get_functions_count = abx500_pmx_get_funcs_cnt,
.get_function_name = abx500_pmx_get_func_name,
.get_function_groups = abx500_pmx_get_func_groups,
.enable = abx500_pmx_enable,
.disable = abx500_pmx_disable,
.gpio_request_enable = abx500_gpio_request_enable,
.gpio_disable_free = abx500_gpio_disable_free,
};
static int abx500_get_groups_cnt(struct pinctrl_dev *pctldev)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
return pct->soc->ngroups;
}
static const char *abx500_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
return pct->soc->groups[selector].name;
}
static int abx500_get_group_pins(struct pinctrl_dev *pctldev,
unsigned selector,
const unsigned **pins,
unsigned *num_pins)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
*pins = pct->soc->groups[selector].pins;
*num_pins = pct->soc->groups[selector].npins;
return 0;
}
static void abx500_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned offset)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
struct gpio_chip *chip = &pct->chip;
abx500_gpio_dbg_show_one(s, pctldev, chip, offset,
chip->base + offset - 1);
}
static const struct pinctrl_ops abx500_pinctrl_ops = {
.get_groups_count = abx500_get_groups_cnt,
.get_group_name = abx500_get_group_name,
.get_group_pins = abx500_get_group_pins,
.pin_dbg_show = abx500_pin_dbg_show,
};
static int abx500_pin_config_get(struct pinctrl_dev *pctldev,
unsigned pin,
unsigned long *config)
{
return -ENOSYS;
}
static int abx500_pin_config_set(struct pinctrl_dev *pctldev,
unsigned pin,
unsigned long config)
{
struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
struct pullud *pullud = pct->soc->pullud;
struct gpio_chip *chip = &pct->chip;
unsigned offset;
int ret;
enum pin_config_param param = pinconf_to_config_param(config);
enum pin_config_param argument = pinconf_to_config_argument(config);
dev_dbg(chip->dev, "pin %d [%#lx]: %s %s\n",
pin, config, (param == PIN_CONFIG_OUTPUT) ? "output " : "input",
(param == PIN_CONFIG_OUTPUT) ? (argument ? "high" : "low") :
(argument ? "pull up" : "pull down"));
/* on ABx500, there is no GPIO0, so adjust the offset */
offset = pin - 1;
switch (param) {
case PIN_CONFIG_BIAS_PULL_DOWN:
/*
* if argument = 1 set the pull down
* else clear the pull down
*/
ret = abx500_gpio_direction_input(chip, offset);
/*
* Some chips only support pull down, while some actually
* support both pull up and pull down. Such chips have
* a "pullud" range specified for the pins that support
* both features. If the pin is not within that range, we
* fall back to the old bit set that only support pull down.
*/
if (pullud &&
pin >= pullud->first_pin &&
pin <= pullud->last_pin)
ret = abx500_config_pull_updown(pct,
pin,
argument ? ABX500_GPIO_PULL_DOWN : ABX500_GPIO_PULL_NONE);
else
/* Chip only supports pull down */
ret = abx500_gpio_set_bits(chip, AB8500_GPIO_PUD1_REG,
offset, argument ? 0 : 1);
break;
case PIN_CONFIG_OUTPUT:
ret = abx500_gpio_direction_output(chip, offset, argument);
break;
default:
dev_err(chip->dev, "illegal configuration requested\n");
return -EINVAL;
}
return ret;
}
static const struct pinconf_ops abx500_pinconf_ops = {
.pin_config_get = abx500_pin_config_get,
.pin_config_set = abx500_pin_config_set,
};
static struct pinctrl_desc abx500_pinctrl_desc = {
.name = "pinctrl-abx500",
.pctlops = &abx500_pinctrl_ops,
.pmxops = &abx500_pinmux_ops,
.confops = &abx500_pinconf_ops,
.owner = THIS_MODULE,
};
static int abx500_get_gpio_num(struct abx500_pinctrl_soc_data *soc)
{
unsigned int lowest = 0;
unsigned int highest = 0;
unsigned int npins = 0;
int i;
/*
* Compute number of GPIOs from the last SoC gpio range descriptors
* These ranges may include "holes" but the GPIO number space shall
* still be homogeneous, so we need to detect and account for any
* such holes so that these are included in the number of GPIO pins.
*/
for (i = 0; i < soc->gpio_num_ranges; i++) {
unsigned gstart;
unsigned gend;
const struct abx500_pinrange *p;
p = &soc->gpio_ranges[i];
gstart = p->offset;
gend = p->offset + p->npins - 1;
if (i == 0) {
/* First iteration, set start values */
lowest = gstart;
highest = gend;
} else {
if (gstart < lowest)
lowest = gstart;
if (gend > highest)
highest = gend;
}
}
/* this gives the absolute number of pins */
npins = highest - lowest + 1;
return npins;
}
static const struct of_device_id abx500_gpio_match[] = {
{ .compatible = "stericsson,ab8500-gpio", .data = (void *)PINCTRL_AB8500, },
{ .compatible = "stericsson,ab8505-gpio", .data = (void *)PINCTRL_AB8505, },
{ .compatible = "stericsson,ab8540-gpio", .data = (void *)PINCTRL_AB8540, },
{ .compatible = "stericsson,ab9540-gpio", .data = (void *)PINCTRL_AB9540, },
{ }
};
static int abx500_gpio_probe(struct platform_device *pdev)
{
struct ab8500_platform_data *abx500_pdata =
dev_get_platdata(pdev->dev.parent);
struct abx500_gpio_platform_data *pdata = NULL;
struct device_node *np = pdev->dev.of_node;
struct abx500_pinctrl *pct;
const struct platform_device_id *platid = platform_get_device_id(pdev);
unsigned int id = -1;
int ret, err;
int i;
if (abx500_pdata)
pdata = abx500_pdata->gpio;
if (!(pdata || np)) {
dev_err(&pdev->dev, "gpio dt and platform data missing\n");
return -ENODEV;
}
pct = devm_kzalloc(&pdev->dev, sizeof(struct abx500_pinctrl),
GFP_KERNEL);
if (pct == NULL) {
dev_err(&pdev->dev,
"failed to allocate memory for pct\n");
return -ENOMEM;
}
pct->dev = &pdev->dev;
pct->parent = dev_get_drvdata(pdev->dev.parent);
pct->chip = abx500gpio_chip;
pct->chip.dev = &pdev->dev;
pct->chip.base = (np) ? -1 : pdata->gpio_base;
if (platid)
id = platid->driver_data;
else if (np) {
const struct of_device_id *match;
match = of_match_device(abx500_gpio_match, &pdev->dev);
if (match)
id = (unsigned long)match->data;
}
/* initialize the lock */
mutex_init(&pct->lock);
/* Poke in other ASIC variants here */
switch (id) {
case PINCTRL_AB8500:
abx500_pinctrl_ab8500_init(&pct->soc);
break;
case PINCTRL_AB8540:
abx500_pinctrl_ab8540_init(&pct->soc);
break;
case PINCTRL_AB9540:
abx500_pinctrl_ab9540_init(&pct->soc);
break;
case PINCTRL_AB8505:
abx500_pinctrl_ab8505_init(&pct->soc);
break;
default:
dev_err(&pdev->dev, "Unsupported pinctrl sub driver (%d)\n", id);
mutex_destroy(&pct->lock);
return -EINVAL;
}
if (!pct->soc) {
dev_err(&pdev->dev, "Invalid SOC data\n");
mutex_destroy(&pct->lock);
return -EINVAL;
}
pct->chip.ngpio = abx500_get_gpio_num(pct->soc);
pct->irq_cluster = pct->soc->gpio_irq_cluster;
pct->irq_cluster_size = pct->soc->ngpio_irq_cluster;
ret = gpiochip_add(&pct->chip);
if (ret) {
dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
mutex_destroy(&pct->lock);
return ret;
}
dev_info(&pdev->dev, "added gpiochip\n");
abx500_pinctrl_desc.pins = pct->soc->pins;
abx500_pinctrl_desc.npins = pct->soc->npins;
pct->pctldev = pinctrl_register(&abx500_pinctrl_desc, &pdev->dev, pct);
if (!pct->pctldev) {
dev_err(&pdev->dev,
"could not register abx500 pinctrl driver\n");
ret = -EINVAL;
goto out_rem_chip;
}
dev_info(&pdev->dev, "registered pin controller\n");
/* We will handle a range of GPIO pins */
for (i = 0; i < pct->soc->gpio_num_ranges; i++) {
const struct abx500_pinrange *p = &pct->soc->gpio_ranges[i];
ret = gpiochip_add_pin_range(&pct->chip,
dev_name(&pdev->dev),
p->offset - 1, p->offset, p->npins);
if (ret < 0)
goto out_rem_chip;
}
platform_set_drvdata(pdev, pct);
dev_info(&pdev->dev, "initialized abx500 pinctrl driver\n");
return 0;
out_rem_chip:
err = gpiochip_remove(&pct->chip);
if (err)
dev_info(&pdev->dev, "failed to remove gpiochip\n");
mutex_destroy(&pct->lock);
return ret;
}
/**
* abx500_gpio_remove() - remove Ab8500-gpio driver
* @pdev: Platform device registered
*/
static int abx500_gpio_remove(struct platform_device *pdev)
{
struct abx500_pinctrl *pct = platform_get_drvdata(pdev);
int ret;
ret = gpiochip_remove(&pct->chip);
if (ret < 0) {
dev_err(pct->dev, "unable to remove gpiochip: %d\n",
ret);
return ret;
}
mutex_destroy(&pct->lock);
return 0;
}
static const struct platform_device_id abx500_pinctrl_id[] = {
{ "pinctrl-ab8500", PINCTRL_AB8500 },
{ "pinctrl-ab8540", PINCTRL_AB8540 },
{ "pinctrl-ab9540", PINCTRL_AB9540 },
{ "pinctrl-ab8505", PINCTRL_AB8505 },
{ },
};
static struct platform_driver abx500_gpio_driver = {
.driver = {
.name = "abx500-gpio",
.owner = THIS_MODULE,
.of_match_table = abx500_gpio_match,
},
.probe = abx500_gpio_probe,
.remove = abx500_gpio_remove,
.id_table = abx500_pinctrl_id,
};
static int __init abx500_gpio_init(void)
{
return platform_driver_register(&abx500_gpio_driver);
}
core_initcall(abx500_gpio_init);
MODULE_AUTHOR("Patrice Chotard <patrice.chotard@st.com>");
MODULE_DESCRIPTION("Driver allows to use AxB5xx unused pins to be used as GPIO");
MODULE_ALIAS("platform:abx500-gpio");
MODULE_LICENSE("GPL v2");