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WSL2-Linux-Kernel/drivers/pinctrl/sunxi/pinctrl-sunxi.c

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37 KiB
C
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/*
* Allwinner A1X SoCs pinctrl driver.
*
* Copyright (C) 2012 Maxime Ripard
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/gpio/driver.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/export.h>
#include <linux/of.h>
#include <linux/of_clk.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/regulator/consumer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <dt-bindings/pinctrl/sun4i-a10.h>
#include "../core.h"
#include "pinctrl-sunxi.h"
static struct irq_chip sunxi_pinctrl_edge_irq_chip;
static struct irq_chip sunxi_pinctrl_level_irq_chip;
static struct sunxi_pinctrl_group *
sunxi_pinctrl_find_group_by_name(struct sunxi_pinctrl *pctl, const char *group)
{
int i;
for (i = 0; i < pctl->ngroups; i++) {
struct sunxi_pinctrl_group *grp = pctl->groups + i;
if (!strcmp(grp->name, group))
return grp;
}
return NULL;
}
static struct sunxi_pinctrl_function *
sunxi_pinctrl_find_function_by_name(struct sunxi_pinctrl *pctl,
const char *name)
{
struct sunxi_pinctrl_function *func = pctl->functions;
int i;
for (i = 0; i < pctl->nfunctions; i++) {
if (!func[i].name)
break;
if (!strcmp(func[i].name, name))
return func + i;
}
return NULL;
}
static struct sunxi_desc_function *
sunxi_pinctrl_desc_find_function_by_name(struct sunxi_pinctrl *pctl,
const char *pin_name,
const char *func_name)
{
int i;
for (i = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
if (!strcmp(pin->pin.name, pin_name)) {
struct sunxi_desc_function *func = pin->functions;
while (func->name) {
if (!strcmp(func->name, func_name) &&
(!func->variant ||
func->variant & pctl->variant))
return func;
func++;
}
}
}
return NULL;
}
static struct sunxi_desc_function *
sunxi_pinctrl_desc_find_function_by_pin(struct sunxi_pinctrl *pctl,
const u16 pin_num,
const char *func_name)
{
int i;
for (i = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
if (pin->pin.number == pin_num) {
struct sunxi_desc_function *func = pin->functions;
while (func->name) {
if (!strcmp(func->name, func_name))
return func;
func++;
}
}
}
return NULL;
}
static int sunxi_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->ngroups;
}
static const char *sunxi_pctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->groups[group].name;
}
static int sunxi_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group,
const unsigned **pins,
unsigned *num_pins)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
*pins = (unsigned *)&pctl->groups[group].pin;
*num_pins = 1;
return 0;
}
static bool sunxi_pctrl_has_bias_prop(struct device_node *node)
{
return of_find_property(node, "bias-pull-up", NULL) ||
of_find_property(node, "bias-pull-down", NULL) ||
of_find_property(node, "bias-disable", NULL) ||
of_find_property(node, "allwinner,pull", NULL);
}
static bool sunxi_pctrl_has_drive_prop(struct device_node *node)
{
return of_find_property(node, "drive-strength", NULL) ||
of_find_property(node, "allwinner,drive", NULL);
}
static int sunxi_pctrl_parse_bias_prop(struct device_node *node)
{
u32 val;
/* Try the new style binding */
if (of_find_property(node, "bias-pull-up", NULL))
return PIN_CONFIG_BIAS_PULL_UP;
if (of_find_property(node, "bias-pull-down", NULL))
return PIN_CONFIG_BIAS_PULL_DOWN;
if (of_find_property(node, "bias-disable", NULL))
return PIN_CONFIG_BIAS_DISABLE;
/* And fall back to the old binding */
if (of_property_read_u32(node, "allwinner,pull", &val))
return -EINVAL;
switch (val) {
case SUN4I_PINCTRL_NO_PULL:
return PIN_CONFIG_BIAS_DISABLE;
case SUN4I_PINCTRL_PULL_UP:
return PIN_CONFIG_BIAS_PULL_UP;
case SUN4I_PINCTRL_PULL_DOWN:
return PIN_CONFIG_BIAS_PULL_DOWN;
}
return -EINVAL;
}
static int sunxi_pctrl_parse_drive_prop(struct device_node *node)
{
u32 val;
/* Try the new style binding */
if (!of_property_read_u32(node, "drive-strength", &val)) {
/* We can't go below 10mA ... */
if (val < 10)
return -EINVAL;
/* ... and only up to 40 mA ... */
if (val > 40)
val = 40;
/* by steps of 10 mA */
return rounddown(val, 10);
}
/* And then fall back to the old binding */
if (of_property_read_u32(node, "allwinner,drive", &val))
return -EINVAL;
return (val + 1) * 10;
}
static const char *sunxi_pctrl_parse_function_prop(struct device_node *node)
{
const char *function;
int ret;
/* Try the generic binding */
ret = of_property_read_string(node, "function", &function);
if (!ret)
return function;
/* And fall back to our legacy one */
ret = of_property_read_string(node, "allwinner,function", &function);
if (!ret)
return function;
return NULL;
}
static const char *sunxi_pctrl_find_pins_prop(struct device_node *node,
int *npins)
{
int count;
/* Try the generic binding */
count = of_property_count_strings(node, "pins");
if (count > 0) {
*npins = count;
return "pins";
}
/* And fall back to our legacy one */
count = of_property_count_strings(node, "allwinner,pins");
if (count > 0) {
*npins = count;
return "allwinner,pins";
}
return NULL;
}
static unsigned long *sunxi_pctrl_build_pin_config(struct device_node *node,
unsigned int *len)
{
unsigned long *pinconfig;
unsigned int configlen = 0, idx = 0;
int ret;
if (sunxi_pctrl_has_drive_prop(node))
configlen++;
if (sunxi_pctrl_has_bias_prop(node))
configlen++;
/*
* If we don't have any configuration, bail out
*/
if (!configlen)
return NULL;
pinconfig = kcalloc(configlen, sizeof(*pinconfig), GFP_KERNEL);
if (!pinconfig)
return ERR_PTR(-ENOMEM);
if (sunxi_pctrl_has_drive_prop(node)) {
int drive = sunxi_pctrl_parse_drive_prop(node);
if (drive < 0) {
ret = drive;
goto err_free;
}
pinconfig[idx++] = pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH,
drive);
}
if (sunxi_pctrl_has_bias_prop(node)) {
int pull = sunxi_pctrl_parse_bias_prop(node);
int arg = 0;
if (pull < 0) {
ret = pull;
goto err_free;
}
if (pull != PIN_CONFIG_BIAS_DISABLE)
arg = 1; /* hardware uses weak pull resistors */
pinconfig[idx++] = pinconf_to_config_packed(pull, arg);
}
*len = configlen;
return pinconfig;
err_free:
kfree(pinconfig);
return ERR_PTR(ret);
}
static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
struct device_node *node,
struct pinctrl_map **map,
unsigned *num_maps)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
unsigned long *pinconfig;
struct property *prop;
const char *function, *pin_prop;
const char *group;
int ret, npins, nmaps, configlen = 0, i = 0;
*map = NULL;
*num_maps = 0;
function = sunxi_pctrl_parse_function_prop(node);
if (!function) {
dev_err(pctl->dev, "missing function property in node %pOFn\n",
node);
return -EINVAL;
}
pin_prop = sunxi_pctrl_find_pins_prop(node, &npins);
if (!pin_prop) {
dev_err(pctl->dev, "missing pins property in node %pOFn\n",
node);
return -EINVAL;
}
/*
* We have two maps for each pin: one for the function, one
* for the configuration (bias, strength, etc).
*
* We might be slightly overshooting, since we might not have
* any configuration.
*/
nmaps = npins * 2;
*map = kmalloc_array(nmaps, sizeof(struct pinctrl_map), GFP_KERNEL);
if (!*map)
return -ENOMEM;
pinconfig = sunxi_pctrl_build_pin_config(node, &configlen);
if (IS_ERR(pinconfig)) {
ret = PTR_ERR(pinconfig);
goto err_free_map;
}
of_property_for_each_string(node, pin_prop, prop, group) {
struct sunxi_pinctrl_group *grp =
sunxi_pinctrl_find_group_by_name(pctl, group);
if (!grp) {
dev_err(pctl->dev, "unknown pin %s", group);
continue;
}
if (!sunxi_pinctrl_desc_find_function_by_name(pctl,
grp->name,
function)) {
dev_err(pctl->dev, "unsupported function %s on pin %s",
function, group);
continue;
}
(*map)[i].type = PIN_MAP_TYPE_MUX_GROUP;
(*map)[i].data.mux.group = group;
(*map)[i].data.mux.function = function;
i++;
if (pinconfig) {
(*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
(*map)[i].data.configs.group_or_pin = group;
(*map)[i].data.configs.configs = pinconfig;
(*map)[i].data.configs.num_configs = configlen;
i++;
}
}
*num_maps = i;
/*
* We know have the number of maps we need, we can resize our
* map array
*/
*map = krealloc(*map, i * sizeof(struct pinctrl_map), GFP_KERNEL);
if (!*map)
return -ENOMEM;
return 0;
err_free_map:
kfree(*map);
*map = NULL;
return ret;
}
static void sunxi_pctrl_dt_free_map(struct pinctrl_dev *pctldev,
struct pinctrl_map *map,
unsigned num_maps)
{
int i;
/* pin config is never in the first map */
for (i = 1; i < num_maps; i++) {
if (map[i].type != PIN_MAP_TYPE_CONFIGS_GROUP)
continue;
/*
* All the maps share the same pin config,
* free only the first one we find.
*/
kfree(map[i].data.configs.configs);
break;
}
kfree(map);
}
static const struct pinctrl_ops sunxi_pctrl_ops = {
.dt_node_to_map = sunxi_pctrl_dt_node_to_map,
.dt_free_map = sunxi_pctrl_dt_free_map,
.get_groups_count = sunxi_pctrl_get_groups_count,
.get_group_name = sunxi_pctrl_get_group_name,
.get_group_pins = sunxi_pctrl_get_group_pins,
};
static int sunxi_pconf_reg(unsigned pin, enum pin_config_param param,
u32 *offset, u32 *shift, u32 *mask)
{
switch (param) {
case PIN_CONFIG_DRIVE_STRENGTH:
*offset = sunxi_dlevel_reg(pin);
*shift = sunxi_dlevel_offset(pin);
*mask = DLEVEL_PINS_MASK;
break;
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_BIAS_DISABLE:
*offset = sunxi_pull_reg(pin);
*shift = sunxi_pull_offset(pin);
*mask = PULL_PINS_MASK;
break;
default:
return -ENOTSUPP;
}
return 0;
}
static int sunxi_pconf_get(struct pinctrl_dev *pctldev, unsigned pin,
unsigned long *config)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
u32 offset, shift, mask, val;
u16 arg;
int ret;
pin -= pctl->desc->pin_base;
ret = sunxi_pconf_reg(pin, param, &offset, &shift, &mask);
if (ret < 0)
return ret;
val = (readl(pctl->membase + offset) >> shift) & mask;
switch (pinconf_to_config_param(*config)) {
case PIN_CONFIG_DRIVE_STRENGTH:
arg = (val + 1) * 10;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (val != SUN4I_PINCTRL_PULL_UP)
return -EINVAL;
arg = 1; /* hardware is weak pull-up */
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (val != SUN4I_PINCTRL_PULL_DOWN)
return -EINVAL;
arg = 1; /* hardware is weak pull-down */
break;
case PIN_CONFIG_BIAS_DISABLE:
if (val != SUN4I_PINCTRL_NO_PULL)
return -EINVAL;
arg = 0;
break;
default:
/* sunxi_pconf_reg should catch anything unsupported */
WARN_ON(1);
return -ENOTSUPP;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int sunxi_pconf_group_get(struct pinctrl_dev *pctldev,
unsigned group,
unsigned long *config)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct sunxi_pinctrl_group *g = &pctl->groups[group];
/* We only support 1 pin per group. Chain it to the pin callback */
return sunxi_pconf_get(pctldev, g->pin, config);
}
static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev,
unsigned group,
unsigned long *configs,
unsigned num_configs)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct sunxi_pinctrl_group *g = &pctl->groups[group];
unsigned pin = g->pin - pctl->desc->pin_base;
int i;
for (i = 0; i < num_configs; i++) {
enum pin_config_param param;
unsigned long flags;
u32 offset, shift, mask, reg;
u32 arg, val;
int ret;
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
ret = sunxi_pconf_reg(pin, param, &offset, &shift, &mask);
if (ret < 0)
return ret;
switch (param) {
case PIN_CONFIG_DRIVE_STRENGTH:
if (arg < 10 || arg > 40)
return -EINVAL;
/*
* We convert from mA to what the register expects:
* 0: 10mA
* 1: 20mA
* 2: 30mA
* 3: 40mA
*/
val = arg / 10 - 1;
break;
case PIN_CONFIG_BIAS_DISABLE:
val = 0;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (arg == 0)
return -EINVAL;
val = 1;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (arg == 0)
return -EINVAL;
val = 2;
break;
default:
/* sunxi_pconf_reg should catch anything unsupported */
WARN_ON(1);
return -ENOTSUPP;
}
raw_spin_lock_irqsave(&pctl->lock, flags);
reg = readl(pctl->membase + offset);
reg &= ~(mask << shift);
writel(reg | val << shift, pctl->membase + offset);
raw_spin_unlock_irqrestore(&pctl->lock, flags);
} /* for each config */
return 0;
}
static const struct pinconf_ops sunxi_pconf_ops = {
.is_generic = true,
.pin_config_get = sunxi_pconf_get,
.pin_config_group_get = sunxi_pconf_group_get,
.pin_config_group_set = sunxi_pconf_group_set,
};
static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl,
unsigned pin,
struct regulator *supply)
{
u32 val, reg;
int uV;
if (!pctl->desc->has_io_bias_cfg)
return 0;
uV = regulator_get_voltage(supply);
if (uV < 0)
return uV;
/* Might be dummy regulator with no voltage set */
if (uV == 0)
return 0;
/* Configured value must be equal or greater to actual voltage */
if (uV <= 1800000)
val = 0x0; /* 1.8V */
else if (uV <= 2500000)
val = 0x6; /* 2.5V */
else if (uV <= 2800000)
val = 0x9; /* 2.8V */
else if (uV <= 3000000)
val = 0xA; /* 3.0V */
else
val = 0xD; /* 3.3V */
pin -= pctl->desc->pin_base;
reg = readl(pctl->membase + sunxi_grp_config_reg(pin));
reg &= ~IO_BIAS_MASK;
writel(reg | val, pctl->membase + sunxi_grp_config_reg(pin));
return 0;
}
static int sunxi_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->nfunctions;
}
static const char *sunxi_pmx_get_func_name(struct pinctrl_dev *pctldev,
unsigned function)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
return pctl->functions[function].name;
}
static int sunxi_pmx_get_func_groups(struct pinctrl_dev *pctldev,
unsigned function,
const char * const **groups,
unsigned * const num_groups)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
*groups = pctl->functions[function].groups;
*num_groups = pctl->functions[function].ngroups;
return 0;
}
static void sunxi_pmx_set(struct pinctrl_dev *pctldev,
unsigned pin,
u8 config)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
unsigned long flags;
u32 val, mask;
raw_spin_lock_irqsave(&pctl->lock, flags);
pin -= pctl->desc->pin_base;
val = readl(pctl->membase + sunxi_mux_reg(pin));
mask = MUX_PINS_MASK << sunxi_mux_offset(pin);
writel((val & ~mask) | config << sunxi_mux_offset(pin),
pctl->membase + sunxi_mux_reg(pin));
raw_spin_unlock_irqrestore(&pctl->lock, flags);
}
static int sunxi_pmx_set_mux(struct pinctrl_dev *pctldev,
unsigned function,
unsigned group)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct sunxi_pinctrl_group *g = pctl->groups + group;
struct sunxi_pinctrl_function *func = pctl->functions + function;
struct sunxi_desc_function *desc =
sunxi_pinctrl_desc_find_function_by_name(pctl,
g->name,
func->name);
if (!desc)
return -EINVAL;
sunxi_pmx_set(pctldev, g->pin, desc->muxval);
return 0;
}
static int
sunxi_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset,
bool input)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct sunxi_desc_function *desc;
const char *func;
if (input)
func = "gpio_in";
else
func = "gpio_out";
desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, offset, func);
if (!desc)
return -EINVAL;
sunxi_pmx_set(pctldev, offset, desc->muxval);
return 0;
}
static int sunxi_pmx_request(struct pinctrl_dev *pctldev, unsigned offset)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
unsigned short bank = offset / PINS_PER_BANK;
unsigned short bank_offset = bank - pctl->desc->pin_base /
PINS_PER_BANK;
struct sunxi_pinctrl_regulator *s_reg = &pctl->regulators[bank_offset];
struct regulator *reg = s_reg->regulator;
char supply[16];
int ret;
if (reg) {
refcount_inc(&s_reg->refcount);
return 0;
}
snprintf(supply, sizeof(supply), "vcc-p%c", 'a' + bank);
reg = regulator_get(pctl->dev, supply);
if (IS_ERR(reg)) {
dev_err(pctl->dev, "Couldn't get bank P%c regulator\n",
'A' + bank);
return PTR_ERR(reg);
}
ret = regulator_enable(reg);
if (ret) {
dev_err(pctl->dev,
"Couldn't enable bank P%c regulator\n", 'A' + bank);
goto out;
}
sunxi_pinctrl_set_io_bias_cfg(pctl, offset, reg);
s_reg->regulator = reg;
refcount_set(&s_reg->refcount, 1);
return 0;
out:
regulator_put(s_reg->regulator);
return ret;
}
static int sunxi_pmx_free(struct pinctrl_dev *pctldev, unsigned offset)
{
struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
unsigned short bank = offset / PINS_PER_BANK;
unsigned short bank_offset = bank - pctl->desc->pin_base /
PINS_PER_BANK;
struct sunxi_pinctrl_regulator *s_reg = &pctl->regulators[bank_offset];
if (!refcount_dec_and_test(&s_reg->refcount))
return 0;
regulator_disable(s_reg->regulator);
regulator_put(s_reg->regulator);
s_reg->regulator = NULL;
return 0;
}
static const struct pinmux_ops sunxi_pmx_ops = {
.get_functions_count = sunxi_pmx_get_funcs_cnt,
.get_function_name = sunxi_pmx_get_func_name,
.get_function_groups = sunxi_pmx_get_func_groups,
.set_mux = sunxi_pmx_set_mux,
.gpio_set_direction = sunxi_pmx_gpio_set_direction,
.request = sunxi_pmx_request,
.free = sunxi_pmx_free,
.strict = true,
};
static int sunxi_pinctrl_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
}
static int sunxi_pinctrl_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct sunxi_pinctrl *pctl = gpiochip_get_data(chip);
u32 reg = sunxi_data_reg(offset);
u8 index = sunxi_data_offset(offset);
bool set_mux = pctl->desc->irq_read_needs_mux &&
gpiochip_line_is_irq(chip, offset);
u32 pin = offset + chip->base;
u32 val;
if (set_mux)
sunxi_pmx_set(pctl->pctl_dev, pin, SUN4I_FUNC_INPUT);
val = (readl(pctl->membase + reg) >> index) & DATA_PINS_MASK;
if (set_mux)
sunxi_pmx_set(pctl->pctl_dev, pin, SUN4I_FUNC_IRQ);
return !!val;
}
static void sunxi_pinctrl_gpio_set(struct gpio_chip *chip,
unsigned offset, int value)
{
struct sunxi_pinctrl *pctl = gpiochip_get_data(chip);
u32 reg = sunxi_data_reg(offset);
u8 index = sunxi_data_offset(offset);
unsigned long flags;
u32 regval;
raw_spin_lock_irqsave(&pctl->lock, flags);
regval = readl(pctl->membase + reg);
if (value)
regval |= BIT(index);
else
regval &= ~(BIT(index));
writel(regval, pctl->membase + reg);
raw_spin_unlock_irqrestore(&pctl->lock, flags);
}
static int sunxi_pinctrl_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int value)
{
sunxi_pinctrl_gpio_set(chip, offset, value);
return pinctrl_gpio_direction_output(chip->base + offset);
}
static int sunxi_pinctrl_gpio_of_xlate(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec,
u32 *flags)
{
int pin, base;
base = PINS_PER_BANK * gpiospec->args[0];
pin = base + gpiospec->args[1];
if (pin > gc->ngpio)
return -EINVAL;
if (flags)
*flags = gpiospec->args[2];
return pin;
}
static int sunxi_pinctrl_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct sunxi_pinctrl *pctl = gpiochip_get_data(chip);
struct sunxi_desc_function *desc;
unsigned pinnum = pctl->desc->pin_base + offset;
unsigned irqnum;
if (offset >= chip->ngpio)
return -ENXIO;
desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, pinnum, "irq");
if (!desc)
return -EINVAL;
irqnum = desc->irqbank * IRQ_PER_BANK + desc->irqnum;
dev_dbg(chip->parent, "%s: request IRQ for GPIO %d, return %d\n",
chip->label, offset + chip->base, irqnum);
return irq_find_mapping(pctl->domain, irqnum);
}
static int sunxi_pinctrl_irq_request_resources(struct irq_data *d)
{
struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
struct sunxi_desc_function *func;
int ret;
func = sunxi_pinctrl_desc_find_function_by_pin(pctl,
pctl->irq_array[d->hwirq], "irq");
if (!func)
return -EINVAL;
ret = gpiochip_lock_as_irq(pctl->chip,
pctl->irq_array[d->hwirq] - pctl->desc->pin_base);
if (ret) {
dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n",
irqd_to_hwirq(d));
return ret;
}
/* Change muxing to INT mode */
sunxi_pmx_set(pctl->pctl_dev, pctl->irq_array[d->hwirq], func->muxval);
return 0;
}
static void sunxi_pinctrl_irq_release_resources(struct irq_data *d)
{
struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
gpiochip_unlock_as_irq(pctl->chip,
pctl->irq_array[d->hwirq] - pctl->desc->pin_base);
}
static int sunxi_pinctrl_irq_set_type(struct irq_data *d, unsigned int type)
{
struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
u32 reg = sunxi_irq_cfg_reg(pctl->desc, d->hwirq);
u8 index = sunxi_irq_cfg_offset(d->hwirq);
unsigned long flags;
u32 regval;
u8 mode;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
mode = IRQ_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
mode = IRQ_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
mode = IRQ_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
mode = IRQ_LEVEL_HIGH;
break;
case IRQ_TYPE_LEVEL_LOW:
mode = IRQ_LEVEL_LOW;
break;
default:
return -EINVAL;
}
raw_spin_lock_irqsave(&pctl->lock, flags);
if (type & IRQ_TYPE_LEVEL_MASK)
irq_set_chip_handler_name_locked(d, &sunxi_pinctrl_level_irq_chip,
handle_fasteoi_irq, NULL);
else
irq_set_chip_handler_name_locked(d, &sunxi_pinctrl_edge_irq_chip,
handle_edge_irq, NULL);
regval = readl(pctl->membase + reg);
regval &= ~(IRQ_CFG_IRQ_MASK << index);
writel(regval | (mode << index), pctl->membase + reg);
raw_spin_unlock_irqrestore(&pctl->lock, flags);
return 0;
}
static void sunxi_pinctrl_irq_ack(struct irq_data *d)
{
struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
u32 status_reg = sunxi_irq_status_reg(pctl->desc, d->hwirq);
u8 status_idx = sunxi_irq_status_offset(d->hwirq);
/* Clear the IRQ */
writel(1 << status_idx, pctl->membase + status_reg);
}
static void sunxi_pinctrl_irq_mask(struct irq_data *d)
{
struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
u32 reg = sunxi_irq_ctrl_reg(pctl->desc, d->hwirq);
u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&pctl->lock, flags);
/* Mask the IRQ */
val = readl(pctl->membase + reg);
writel(val & ~(1 << idx), pctl->membase + reg);
raw_spin_unlock_irqrestore(&pctl->lock, flags);
}
static void sunxi_pinctrl_irq_unmask(struct irq_data *d)
{
struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
u32 reg = sunxi_irq_ctrl_reg(pctl->desc, d->hwirq);
u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&pctl->lock, flags);
/* Unmask the IRQ */
val = readl(pctl->membase + reg);
writel(val | (1 << idx), pctl->membase + reg);
raw_spin_unlock_irqrestore(&pctl->lock, flags);
}
static void sunxi_pinctrl_irq_ack_unmask(struct irq_data *d)
{
sunxi_pinctrl_irq_ack(d);
sunxi_pinctrl_irq_unmask(d);
}
static struct irq_chip sunxi_pinctrl_edge_irq_chip = {
.name = "sunxi_pio_edge",
.irq_ack = sunxi_pinctrl_irq_ack,
.irq_mask = sunxi_pinctrl_irq_mask,
.irq_unmask = sunxi_pinctrl_irq_unmask,
.irq_request_resources = sunxi_pinctrl_irq_request_resources,
.irq_release_resources = sunxi_pinctrl_irq_release_resources,
.irq_set_type = sunxi_pinctrl_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static struct irq_chip sunxi_pinctrl_level_irq_chip = {
.name = "sunxi_pio_level",
.irq_eoi = sunxi_pinctrl_irq_ack,
.irq_mask = sunxi_pinctrl_irq_mask,
.irq_unmask = sunxi_pinctrl_irq_unmask,
/* Define irq_enable / disable to avoid spurious irqs for drivers
* using these to suppress irqs while they clear the irq source */
.irq_enable = sunxi_pinctrl_irq_ack_unmask,
.irq_disable = sunxi_pinctrl_irq_mask,
.irq_request_resources = sunxi_pinctrl_irq_request_resources,
.irq_release_resources = sunxi_pinctrl_irq_release_resources,
.irq_set_type = sunxi_pinctrl_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_EOI_THREADED |
IRQCHIP_EOI_IF_HANDLED,
};
static int sunxi_pinctrl_irq_of_xlate(struct irq_domain *d,
struct device_node *node,
const u32 *intspec,
unsigned int intsize,
unsigned long *out_hwirq,
unsigned int *out_type)
{
struct sunxi_pinctrl *pctl = d->host_data;
struct sunxi_desc_function *desc;
int pin, base;
if (intsize < 3)
return -EINVAL;
base = PINS_PER_BANK * intspec[0];
pin = pctl->desc->pin_base + base + intspec[1];
desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, pin, "irq");
if (!desc)
return -EINVAL;
*out_hwirq = desc->irqbank * PINS_PER_BANK + desc->irqnum;
*out_type = intspec[2];
return 0;
}
static const struct irq_domain_ops sunxi_pinctrl_irq_domain_ops = {
.xlate = sunxi_pinctrl_irq_of_xlate,
};
static void sunxi_pinctrl_irq_handler(struct irq_desc *desc)
{
unsigned int irq = irq_desc_get_irq(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
struct sunxi_pinctrl *pctl = irq_desc_get_handler_data(desc);
unsigned long bank, reg, val;
for (bank = 0; bank < pctl->desc->irq_banks; bank++)
if (irq == pctl->irq[bank])
break;
if (bank == pctl->desc->irq_banks)
return;
reg = sunxi_irq_status_reg_from_bank(pctl->desc, bank);
val = readl(pctl->membase + reg);
if (val) {
int irqoffset;
chained_irq_enter(chip, desc);
for_each_set_bit(irqoffset, &val, IRQ_PER_BANK) {
int pin_irq = irq_find_mapping(pctl->domain,
bank * IRQ_PER_BANK + irqoffset);
generic_handle_irq(pin_irq);
}
chained_irq_exit(chip, desc);
}
}
static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,
const char *name)
{
struct sunxi_pinctrl_function *func = pctl->functions;
while (func->name) {
/* function already there */
if (strcmp(func->name, name) == 0) {
func->ngroups++;
return -EEXIST;
}
func++;
}
func->name = name;
func->ngroups = 1;
pctl->nfunctions++;
return 0;
}
static int sunxi_pinctrl_build_state(struct platform_device *pdev)
{
struct sunxi_pinctrl *pctl = platform_get_drvdata(pdev);
void *ptr;
int i;
/*
* Allocate groups
*
* We assume that the number of groups is the number of pins
* given in the data array.
* This will not always be true, since some pins might not be
* available in the current variant, but fortunately for us,
* this means that the number of pins is the maximum group
* number we will ever see.
*/
pctl->groups = devm_kcalloc(&pdev->dev,
pctl->desc->npins, sizeof(*pctl->groups),
GFP_KERNEL);
if (!pctl->groups)
return -ENOMEM;
for (i = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
struct sunxi_pinctrl_group *group = pctl->groups + pctl->ngroups;
if (pin->variant && !(pctl->variant & pin->variant))
continue;
group->name = pin->pin.name;
group->pin = pin->pin.number;
/* And now we count the actual number of pins / groups */
pctl->ngroups++;
}
/*
* We suppose that we won't have any more functions than pins,
* we'll reallocate that later anyway
*/
pctl->functions = kcalloc(pctl->ngroups,
sizeof(*pctl->functions),
GFP_KERNEL);
if (!pctl->functions)
return -ENOMEM;
/* Count functions and their associated groups */
for (i = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
struct sunxi_desc_function *func;
if (pin->variant && !(pctl->variant & pin->variant))
continue;
for (func = pin->functions; func->name; func++) {
if (func->variant && !(pctl->variant & func->variant))
continue;
/* Create interrupt mapping while we're at it */
if (!strcmp(func->name, "irq")) {
int irqnum = func->irqnum + func->irqbank * IRQ_PER_BANK;
pctl->irq_array[irqnum] = pin->pin.number;
}
sunxi_pinctrl_add_function(pctl, func->name);
}
}
/* And now allocated and fill the array for real */
ptr = krealloc(pctl->functions,
pctl->nfunctions * sizeof(*pctl->functions),
GFP_KERNEL);
if (!ptr) {
kfree(pctl->functions);
pctl->functions = NULL;
return -ENOMEM;
}
pctl->functions = ptr;
for (i = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
struct sunxi_desc_function *func;
if (pin->variant && !(pctl->variant & pin->variant))
continue;
for (func = pin->functions; func->name; func++) {
struct sunxi_pinctrl_function *func_item;
const char **func_grp;
if (func->variant && !(pctl->variant & func->variant))
continue;
func_item = sunxi_pinctrl_find_function_by_name(pctl,
func->name);
if (!func_item) {
kfree(pctl->functions);
return -EINVAL;
}
if (!func_item->groups) {
func_item->groups =
devm_kcalloc(&pdev->dev,
func_item->ngroups,
sizeof(*func_item->groups),
GFP_KERNEL);
if (!func_item->groups) {
kfree(pctl->functions);
return -ENOMEM;
}
}
func_grp = func_item->groups;
while (*func_grp)
func_grp++;
*func_grp = pin->pin.name;
}
}
return 0;
}
static int sunxi_pinctrl_get_debounce_div(struct clk *clk, int freq, int *diff)
{
unsigned long clock = clk_get_rate(clk);
unsigned int best_diff, best_div;
int i;
best_diff = abs(freq - clock);
best_div = 0;
for (i = 1; i < 8; i++) {
int cur_diff = abs(freq - (clock >> i));
if (cur_diff < best_diff) {
best_diff = cur_diff;
best_div = i;
}
}
*diff = best_diff;
return best_div;
}
static int sunxi_pinctrl_setup_debounce(struct sunxi_pinctrl *pctl,
struct device_node *node)
{
unsigned int hosc_diff, losc_diff;
unsigned int hosc_div, losc_div;
struct clk *hosc, *losc;
u8 div, src;
int i, ret;
/* Deal with old DTs that didn't have the oscillators */
if (of_clk_get_parent_count(node) != 3)
return 0;
/* If we don't have any setup, bail out */
if (!of_find_property(node, "input-debounce", NULL))
return 0;
losc = devm_clk_get(pctl->dev, "losc");
if (IS_ERR(losc))
return PTR_ERR(losc);
hosc = devm_clk_get(pctl->dev, "hosc");
if (IS_ERR(hosc))
return PTR_ERR(hosc);
for (i = 0; i < pctl->desc->irq_banks; i++) {
unsigned long debounce_freq;
u32 debounce;
ret = of_property_read_u32_index(node, "input-debounce",
i, &debounce);
if (ret)
return ret;
if (!debounce)
continue;
debounce_freq = DIV_ROUND_CLOSEST(USEC_PER_SEC, debounce);
losc_div = sunxi_pinctrl_get_debounce_div(losc,
debounce_freq,
&losc_diff);
hosc_div = sunxi_pinctrl_get_debounce_div(hosc,
debounce_freq,
&hosc_diff);
if (hosc_diff < losc_diff) {
div = hosc_div;
src = 1;
} else {
div = losc_div;
src = 0;
}
writel(src | div << 4,
pctl->membase +
sunxi_irq_debounce_reg_from_bank(pctl->desc, i));
}
return 0;
}
int sunxi_pinctrl_init_with_variant(struct platform_device *pdev,
const struct sunxi_pinctrl_desc *desc,
unsigned long variant)
{
struct device_node *node = pdev->dev.of_node;
struct pinctrl_desc *pctrl_desc;
struct pinctrl_pin_desc *pins;
struct sunxi_pinctrl *pctl;
struct pinmux_ops *pmxops;
struct resource *res;
int i, ret, last_pin, pin_idx;
struct clk *clk;
pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
if (!pctl)
return -ENOMEM;
platform_set_drvdata(pdev, pctl);
raw_spin_lock_init(&pctl->lock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pctl->membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pctl->membase))
return PTR_ERR(pctl->membase);
pctl->dev = &pdev->dev;
pctl->desc = desc;
pctl->variant = variant;
pctl->irq_array = devm_kcalloc(&pdev->dev,
IRQ_PER_BANK * pctl->desc->irq_banks,
sizeof(*pctl->irq_array),
GFP_KERNEL);
if (!pctl->irq_array)
return -ENOMEM;
ret = sunxi_pinctrl_build_state(pdev);
if (ret) {
dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
return ret;
}
pins = devm_kcalloc(&pdev->dev,
pctl->desc->npins, sizeof(*pins),
GFP_KERNEL);
if (!pins)
return -ENOMEM;
for (i = 0, pin_idx = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
if (pin->variant && !(pctl->variant & pin->variant))
continue;
pins[pin_idx++] = pin->pin;
}
pctrl_desc = devm_kzalloc(&pdev->dev,
sizeof(*pctrl_desc),
GFP_KERNEL);
if (!pctrl_desc)
return -ENOMEM;
pctrl_desc->name = dev_name(&pdev->dev);
pctrl_desc->owner = THIS_MODULE;
pctrl_desc->pins = pins;
pctrl_desc->npins = pctl->ngroups;
pctrl_desc->confops = &sunxi_pconf_ops;
pctrl_desc->pctlops = &sunxi_pctrl_ops;
pmxops = devm_kmemdup(&pdev->dev, &sunxi_pmx_ops, sizeof(sunxi_pmx_ops),
GFP_KERNEL);
if (!pmxops)
return -ENOMEM;
if (desc->disable_strict_mode)
pmxops->strict = false;
pctrl_desc->pmxops = pmxops;
pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, pctl);
if (IS_ERR(pctl->pctl_dev)) {
dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
return PTR_ERR(pctl->pctl_dev);
}
pctl->chip = devm_kzalloc(&pdev->dev, sizeof(*pctl->chip), GFP_KERNEL);
if (!pctl->chip)
return -ENOMEM;
last_pin = pctl->desc->pins[pctl->desc->npins - 1].pin.number;
pctl->chip->owner = THIS_MODULE;
pctl->chip->request = gpiochip_generic_request,
pctl->chip->free = gpiochip_generic_free,
pctl->chip->direction_input = sunxi_pinctrl_gpio_direction_input,
pctl->chip->direction_output = sunxi_pinctrl_gpio_direction_output,
pctl->chip->get = sunxi_pinctrl_gpio_get,
pctl->chip->set = sunxi_pinctrl_gpio_set,
pctl->chip->of_xlate = sunxi_pinctrl_gpio_of_xlate,
pctl->chip->to_irq = sunxi_pinctrl_gpio_to_irq,
pctl->chip->of_gpio_n_cells = 3,
pctl->chip->can_sleep = false,
pctl->chip->ngpio = round_up(last_pin, PINS_PER_BANK) -
pctl->desc->pin_base;
pctl->chip->label = dev_name(&pdev->dev);
pctl->chip->parent = &pdev->dev;
pctl->chip->base = pctl->desc->pin_base;
ret = gpiochip_add_data(pctl->chip, pctl);
if (ret)
return ret;
for (i = 0; i < pctl->desc->npins; i++) {
const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
ret = gpiochip_add_pin_range(pctl->chip, dev_name(&pdev->dev),
pin->pin.number - pctl->desc->pin_base,
pin->pin.number, 1);
if (ret)
goto gpiochip_error;
}
ret = of_clk_get_parent_count(node);
clk = devm_clk_get(&pdev->dev, ret == 1 ? NULL : "apb");
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
goto gpiochip_error;
}
ret = clk_prepare_enable(clk);
if (ret)
goto gpiochip_error;
pctl->irq = devm_kcalloc(&pdev->dev,
pctl->desc->irq_banks,
sizeof(*pctl->irq),
GFP_KERNEL);
if (!pctl->irq) {
ret = -ENOMEM;
goto clk_error;
}
for (i = 0; i < pctl->desc->irq_banks; i++) {
pctl->irq[i] = platform_get_irq(pdev, i);
if (pctl->irq[i] < 0) {
ret = pctl->irq[i];
goto clk_error;
}
}
pctl->domain = irq_domain_add_linear(node,
pctl->desc->irq_banks * IRQ_PER_BANK,
&sunxi_pinctrl_irq_domain_ops,
pctl);
if (!pctl->domain) {
dev_err(&pdev->dev, "Couldn't register IRQ domain\n");
ret = -ENOMEM;
goto clk_error;
}
for (i = 0; i < (pctl->desc->irq_banks * IRQ_PER_BANK); i++) {
int irqno = irq_create_mapping(pctl->domain, i);
irq_set_chip_and_handler(irqno, &sunxi_pinctrl_edge_irq_chip,
handle_edge_irq);
irq_set_chip_data(irqno, pctl);
}
for (i = 0; i < pctl->desc->irq_banks; i++) {
/* Mask and clear all IRQs before registering a handler */
writel(0, pctl->membase +
sunxi_irq_ctrl_reg_from_bank(pctl->desc, i));
writel(0xffffffff,
pctl->membase +
sunxi_irq_status_reg_from_bank(pctl->desc, i));
irq_set_chained_handler_and_data(pctl->irq[i],
sunxi_pinctrl_irq_handler,
pctl);
}
sunxi_pinctrl_setup_debounce(pctl, node);
dev_info(&pdev->dev, "initialized sunXi PIO driver\n");
return 0;
clk_error:
clk_disable_unprepare(clk);
gpiochip_error:
gpiochip_remove(pctl->chip);
return ret;
}
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