Commit 6ac73095 authored by Beniamino Galvani's avatar Beniamino Galvani Committed by Linus Walleij

pinctrl: add driver for Amlogic Meson SoCs

This is a driver for the pinmux and GPIO controller available in
Amlogic Meson SoCs. It currently supports only Meson8, however the
common code should be generic enough to work also for other SoCs after
having defined the proper set of functions and groups.

GPIO interrupts are not supported at the moment due to lack of
documentation.
Signed-off-by: default avatarBeniamino Galvani <b.galvani@gmail.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 40b9e4fa
......@@ -96,6 +96,14 @@ config PINCTRL_FALCON
depends on SOC_FALCON
depends on PINCTRL_LANTIQ
config PINCTRL_MESON
bool
select PINMUX
select PINCONF
select GENERIC_PINCONF
select OF_GPIO
select REGMAP_MMIO
config PINCTRL_ROCKCHIP
bool
select PINMUX
......
......@@ -17,6 +17,7 @@ obj-$(CONFIG_PINCTRL_AT91) += pinctrl-at91.o
obj-$(CONFIG_PINCTRL_BCM2835) += pinctrl-bcm2835.o
obj-$(CONFIG_PINCTRL_BCM281XX) += pinctrl-bcm281xx.o
obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o
obj-$(CONFIG_PINCTRL_MESON) += meson/
obj-$(CONFIG_PINCTRL_PALMAS) += pinctrl-palmas.o
obj-$(CONFIG_PINCTRL_ROCKCHIP) += pinctrl-rockchip.o
obj-$(CONFIG_PINCTRL_SINGLE) += pinctrl-single.o
......
obj-y += pinctrl-meson8.o
obj-y += pinctrl-meson.o
/*
* Pin controller and GPIO driver for Amlogic Meson SoCs
*
* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* The available pins are organized in banks (A,B,C,D,E,X,Y,Z,AO,
* BOOT,CARD for meson6 and X,Y,DV,H,Z,AO,BOOT,CARD for meson8) and
* each bank has a variable number of pins.
*
* The AO bank is special because it belongs to the Always-On power
* domain which can't be powered off; the bank also uses a set of
* registers different from the other banks.
*
* For each of the two power domains (regular and always-on) there are
* 4 different register ranges that control the following properties
* of the pins:
* 1) pin muxing
* 2) pull enable/disable
* 3) pull up/down
* 4) GPIO direction, output value, input value
*
* In some cases the register ranges for pull enable and pull
* direction are the same and thus there are only 3 register ranges.
*
* Every pinmux group can be enabled by a specific bit in the first
* register range of the domain; when all groups for a given pin are
* disabled the pin acts as a GPIO.
*
* For the pull and GPIO configuration every bank uses a contiguous
* set of bits in the register sets described above; the same register
* can be shared by more banks with different offsets.
*
* In addition to this there are some registers shared between all
* banks that control the IRQ functionality. This feature is not
* supported at the moment by the driver.
*/
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
#include "../core.h"
#include "../pinctrl-utils.h"
#include "pinctrl-meson.h"
/**
* meson_get_bank() - find the bank containing a given pin
*
* @domain: the domain containing the pin
* @pin: the pin number
* @bank: the found bank
*
* Return: 0 on success, a negative value on error
*/
static int meson_get_bank(struct meson_domain *domain, unsigned int pin,
struct meson_bank **bank)
{
int i;
for (i = 0; i < domain->data->num_banks; i++) {
if (pin >= domain->data->banks[i].first &&
pin <= domain->data->banks[i].last) {
*bank = &domain->data->banks[i];
return 0;
}
}
return -EINVAL;
}
/**
* meson_get_domain_and_bank() - find domain and bank containing a given pin
*
* @pc: Meson pin controller device
* @pin: the pin number
* @domain: the found domain
* @bank: the found bank
*
* Return: 0 on success, a negative value on error
*/
static int meson_get_domain_and_bank(struct meson_pinctrl *pc, unsigned int pin,
struct meson_domain **domain,
struct meson_bank **bank)
{
struct meson_domain *d;
int i;
for (i = 0; i < pc->data->num_domains; i++) {
d = &pc->domains[i];
if (pin >= d->data->pin_base &&
pin < d->data->pin_base + d->data->num_pins) {
*domain = d;
return meson_get_bank(d, pin, bank);
}
}
return -EINVAL;
}
/**
* meson_calc_reg_and_bit() - calculate register and bit for a pin
*
* @bank: the bank containing the pin
* @pin: the pin number
* @reg_type: the type of register needed (pull-enable, pull, etc...)
* @reg: the computed register offset
* @bit: the computed bit
*/
static void meson_calc_reg_and_bit(struct meson_bank *bank, unsigned int pin,
enum meson_reg_type reg_type,
unsigned int *reg, unsigned int *bit)
{
struct meson_reg_desc *desc = &bank->regs[reg_type];
*reg = desc->reg * 4;
*bit = desc->bit + pin - bank->first;
}
static int meson_get_groups_count(struct pinctrl_dev *pcdev)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->num_groups;
}
static const char *meson_get_group_name(struct pinctrl_dev *pcdev,
unsigned selector)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->groups[selector].name;
}
static int meson_get_group_pins(struct pinctrl_dev *pcdev, unsigned selector,
const unsigned **pins, unsigned *num_pins)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
*pins = pc->data->groups[selector].pins;
*num_pins = pc->data->groups[selector].num_pins;
return 0;
}
static void meson_pin_dbg_show(struct pinctrl_dev *pcdev, struct seq_file *s,
unsigned offset)
{
seq_printf(s, " %s", dev_name(pcdev->dev));
}
static const struct pinctrl_ops meson_pctrl_ops = {
.get_groups_count = meson_get_groups_count,
.get_group_name = meson_get_group_name,
.get_group_pins = meson_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
.dt_free_map = pinctrl_utils_dt_free_map,
.pin_dbg_show = meson_pin_dbg_show,
};
/**
* meson_pmx_disable_other_groups() - disable other groups using a given pin
*
* @pc: meson pin controller device
* @pin: number of the pin
* @sel_group: index of the selected group, or -1 if none
*
* The function disables all pinmux groups using a pin except the
* selected one. If @sel_group is -1 all groups are disabled, leaving
* the pin in GPIO mode.
*/
static void meson_pmx_disable_other_groups(struct meson_pinctrl *pc,
unsigned int pin, int sel_group)
{
struct meson_pmx_group *group;
struct meson_domain *domain;
int i, j;
for (i = 0; i < pc->data->num_groups; i++) {
group = &pc->data->groups[i];
if (group->is_gpio || i == sel_group)
continue;
for (j = 0; j < group->num_pins; j++) {
if (group->pins[j] == pin) {
/* We have found a group using the pin */
domain = &pc->domains[group->domain];
regmap_update_bits(domain->reg_mux,
group->reg * 4,
BIT(group->bit), 0);
}
}
}
}
static int meson_pmx_set_mux(struct pinctrl_dev *pcdev, unsigned func_num,
unsigned group_num)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
struct meson_pmx_func *func = &pc->data->funcs[func_num];
struct meson_pmx_group *group = &pc->data->groups[group_num];
struct meson_domain *domain = &pc->domains[group->domain];
int i, ret = 0;
dev_dbg(pc->dev, "enable function %s, group %s\n", func->name,
group->name);
/*
* Disable groups using the same pin.
* The selected group is not disabled to avoid glitches.
*/
for (i = 0; i < group->num_pins; i++)
meson_pmx_disable_other_groups(pc, group->pins[i], group_num);
/* Function 0 (GPIO) doesn't need any additional setting */
if (func_num)
ret = regmap_update_bits(domain->reg_mux, group->reg * 4,
BIT(group->bit), BIT(group->bit));
return ret;
}
static int meson_pmx_request_gpio(struct pinctrl_dev *pcdev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
meson_pmx_disable_other_groups(pc, range->pin_base + offset, -1);
return 0;
}
static int meson_pmx_get_funcs_count(struct pinctrl_dev *pcdev)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->num_funcs;
}
static const char *meson_pmx_get_func_name(struct pinctrl_dev *pcdev,
unsigned selector)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
return pc->data->funcs[selector].name;
}
static int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
*groups = pc->data->funcs[selector].groups;
*num_groups = pc->data->funcs[selector].num_groups;
return 0;
}
static const struct pinmux_ops meson_pmx_ops = {
.set_mux = meson_pmx_set_mux,
.get_functions_count = meson_pmx_get_funcs_count,
.get_function_name = meson_pmx_get_func_name,
.get_function_groups = meson_pmx_get_groups,
.gpio_request_enable = meson_pmx_request_gpio,
};
static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
unsigned long *configs, unsigned num_configs)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
struct meson_domain *domain;
struct meson_bank *bank;
enum pin_config_param param;
unsigned int reg, bit;
int i, ret;
u16 arg;
ret = meson_get_domain_and_bank(pc, pin, &domain, &bank);
if (ret)
return ret;
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
dev_dbg(pc->dev, "pin %u: disable bias\n", pin);
meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
ret = regmap_update_bits(domain->reg_pull, reg,
BIT(bit), 0);
if (ret)
return ret;
break;
case PIN_CONFIG_BIAS_PULL_UP:
dev_dbg(pc->dev, "pin %u: enable pull-up\n", pin);
meson_calc_reg_and_bit(bank, pin, REG_PULLEN,
&reg, &bit);
ret = regmap_update_bits(domain->reg_pullen, reg,
BIT(bit), BIT(bit));
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
ret = regmap_update_bits(domain->reg_pull, reg,
BIT(bit), BIT(bit));
if (ret)
return ret;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
dev_dbg(pc->dev, "pin %u: enable pull-down\n", pin);
meson_calc_reg_and_bit(bank, pin, REG_PULLEN,
&reg, &bit);
ret = regmap_update_bits(domain->reg_pullen, reg,
BIT(bit), BIT(bit));
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
ret = regmap_update_bits(domain->reg_pull, reg,
BIT(bit), 0);
if (ret)
return ret;
break;
default:
return -ENOTSUPP;
}
}
return 0;
}
static int meson_pinconf_get_pull(struct meson_pinctrl *pc, unsigned int pin)
{
struct meson_domain *domain;
struct meson_bank *bank;
unsigned int reg, bit, val;
int ret, conf;
ret = meson_get_domain_and_bank(pc, pin, &domain, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg, &bit);
ret = regmap_read(domain->reg_pullen, reg, &val);
if (ret)
return ret;
if (!(val & BIT(bit))) {
conf = PIN_CONFIG_BIAS_DISABLE;
} else {
meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
ret = regmap_read(domain->reg_pull, reg, &val);
if (ret)
return ret;
if (val & BIT(bit))
conf = PIN_CONFIG_BIAS_PULL_UP;
else
conf = PIN_CONFIG_BIAS_PULL_DOWN;
}
return conf;
}
static int meson_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin,
unsigned long *config)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
enum pin_config_param param = pinconf_to_config_param(*config);
u16 arg;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_BIAS_PULL_UP:
if (meson_pinconf_get_pull(pc, pin) == param)
arg = 1;
else
return -EINVAL;
break;
default:
return -ENOTSUPP;
}
*config = pinconf_to_config_packed(param, arg);
dev_dbg(pc->dev, "pinconf for pin %u is %lu\n", pin, *config);
return 0;
}
static int meson_pinconf_group_set(struct pinctrl_dev *pcdev,
unsigned int num_group,
unsigned long *configs, unsigned num_configs)
{
struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
struct meson_pmx_group *group = &pc->data->groups[num_group];
int i;
dev_dbg(pc->dev, "set pinconf for group %s\n", group->name);
for (i = 0; i < group->num_pins; i++) {
meson_pinconf_set(pcdev, group->pins[i], configs,
num_configs);
}
return 0;
}
static int meson_pinconf_group_get(struct pinctrl_dev *pcdev,
unsigned int group, unsigned long *config)
{
return -ENOSYS;
}
static const struct pinconf_ops meson_pinconf_ops = {
.pin_config_get = meson_pinconf_get,
.pin_config_set = meson_pinconf_set,
.pin_config_group_get = meson_pinconf_group_get,
.pin_config_group_set = meson_pinconf_group_set,
.is_generic = true,
};
static inline struct meson_domain *to_meson_domain(struct gpio_chip *chip)
{
return container_of(chip, struct meson_domain, chip);
}
static int meson_gpio_request(struct gpio_chip *chip, unsigned gpio)
{
return pinctrl_request_gpio(chip->base + gpio);
}
static void meson_gpio_free(struct gpio_chip *chip, unsigned gpio)
{
struct meson_domain *domain = to_meson_domain(chip);
pinctrl_free_gpio(domain->data->pin_base + gpio);
}
static int meson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
struct meson_domain *domain = to_meson_domain(chip);
unsigned int reg, bit, pin;
struct meson_bank *bank;
int ret;
pin = domain->data->pin_base + gpio;
ret = meson_get_bank(domain, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_DIR, &reg, &bit);
return regmap_update_bits(domain->reg_gpio, reg, BIT(bit), BIT(bit));
}
static int meson_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
int value)
{
struct meson_domain *domain = to_meson_domain(chip);
unsigned int reg, bit, pin;
struct meson_bank *bank;
int ret;
pin = domain->data->pin_base + gpio;
ret = meson_get_bank(domain, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_DIR, &reg, &bit);
ret = regmap_update_bits(domain->reg_gpio, reg, BIT(bit), 0);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_OUT, &reg, &bit);
return regmap_update_bits(domain->reg_gpio, reg, BIT(bit),
value ? BIT(bit) : 0);
}
static void meson_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
{
struct meson_domain *domain = to_meson_domain(chip);
unsigned int reg, bit, pin;
struct meson_bank *bank;
int ret;
pin = domain->data->pin_base + gpio;
ret = meson_get_bank(domain, pin, &bank);
if (ret)
return;
meson_calc_reg_and_bit(bank, pin, REG_OUT, &reg, &bit);
regmap_update_bits(domain->reg_gpio, reg, BIT(bit),
value ? BIT(bit) : 0);
}
static int meson_gpio_get(struct gpio_chip *chip, unsigned gpio)
{
struct meson_domain *domain = to_meson_domain(chip);
unsigned int reg, bit, val, pin;
struct meson_bank *bank;
int ret;
pin = domain->data->pin_base + gpio;
ret = meson_get_bank(domain, pin, &bank);
if (ret)
return ret;
meson_calc_reg_and_bit(bank, pin, REG_IN, &reg, &bit);
regmap_read(domain->reg_gpio, reg, &val);
return !!(val & BIT(bit));
}
static const struct of_device_id meson_pinctrl_dt_match[] = {
{
.compatible = "amlogic,meson8-pinctrl",
.data = &meson8_pinctrl_data,
},
{ },
};
MODULE_DEVICE_TABLE(of, meson_pinctrl_dt_match);
static int meson_gpiolib_register(struct meson_pinctrl *pc)
{
struct meson_domain *domain;
int i, ret;
for (i = 0; i < pc->data->num_domains; i++) {
domain = &pc->domains[i];
domain->chip.label = domain->data->name;
domain->chip.dev = pc->dev;
domain->chip.request = meson_gpio_request;
domain->chip.free = meson_gpio_free;
domain->chip.direction_input = meson_gpio_direction_input;
domain->chip.direction_output = meson_gpio_direction_output;
domain->chip.get = meson_gpio_get;
domain->chip.set = meson_gpio_set;
domain->chip.base = -1;
domain->chip.ngpio = domain->data->num_pins;
domain->chip.can_sleep = false;
domain->chip.of_node = domain->of_node;
domain->chip.of_gpio_n_cells = 2;
ret = gpiochip_add(&domain->chip);
if (ret) {
dev_err(pc->dev, "can't add gpio chip %s\n",
domain->data->name);
goto fail;
}
ret = gpiochip_add_pin_range(&domain->chip, dev_name(pc->dev),
0, domain->data->pin_base,
domain->chip.ngpio);
if (ret) {
dev_err(pc->dev, "can't add pin range\n");
goto fail;
}
}
return 0;
fail:
for (i--; i >= 0; i--)
gpiochip_remove(&pc->domains[i].chip);
return ret;
}
static struct meson_domain_data *meson_get_domain_data(struct meson_pinctrl *pc,
struct device_node *np)
{
int i;
for (i = 0; i < pc->data->num_domains; i++) {
if (!strcmp(np->name, pc->data->domain_data[i].name))
return &pc->data->domain_data[i];
}
return NULL;
}
static struct regmap_config meson_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static struct regmap *meson_map_resource(struct meson_pinctrl *pc,
struct device_node *node, char *name)
{
struct resource res;
void __iomem *base;
int i;
i = of_property_match_string(node, "reg-names", name);
if (of_address_to_resource(node, i, &res))
return ERR_PTR(-ENOENT);
base = devm_ioremap_resource(pc->dev, &res);
if (IS_ERR(base))
return ERR_CAST(base);
meson_regmap_config.max_register = resource_size(&res) - 4;
meson_regmap_config.name = devm_kasprintf(pc->dev, GFP_KERNEL,
"%s-%s", node->name,
name);
if (!meson_regmap_config.name)
return ERR_PTR(-ENOMEM);
return devm_regmap_init_mmio(pc->dev, base, &meson_regmap_config);
}
static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
struct device_node *node)
{
struct device_node *np;
struct meson_domain *domain;
int i = 0, num_domains = 0;
for_each_child_of_node(node, np) {
if (!of_find_property(np, "gpio-controller", NULL))
continue;
num_domains++;
}
if (num_domains != pc->data->num_domains) {
dev_err(pc->dev, "wrong number of subnodes\n");
return -EINVAL;
}
pc->domains = devm_kzalloc(pc->dev, num_domains *
sizeof(struct meson_domain), GFP_KERNEL);
if (!pc->domains)
return -ENOMEM;
for_each_child_of_node(node, np) {
if (!of_find_property(np, "gpio-controller", NULL))
continue;
domain = &pc->domains[i];
domain->data = meson_get_domain_data(pc, np);
if (!domain->data) {
dev_err(pc->dev, "domain data not found for node %s\n",
np->name);
return -ENODEV;
}
domain->of_node = np;
domain->reg_mux = meson_map_resource(pc, np, "mux");
if (IS_ERR(domain->reg_mux)) {
dev_err(pc->dev, "mux registers not found\n");
return PTR_ERR(domain->reg_mux);
}
domain->reg_pull = meson_map_resource(pc, np, "pull");
if (IS_ERR(domain->reg_pull)) {
dev_err(pc->dev, "pull registers not found\n");
return PTR_ERR(domain->reg_pull);
}