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linux/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c

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/*
* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that 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/gpio/driver.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
#include "../core.h"
#include "../pinctrl-utils.h"
#define PMIC_GPIO_ADDRESS_RANGE 0x100
/* type and subtype registers base address offsets */
#define PMIC_GPIO_REG_TYPE 0x4
#define PMIC_GPIO_REG_SUBTYPE 0x5
/* GPIO peripheral type and subtype out_values */
#define PMIC_GPIO_TYPE 0x10
#define PMIC_GPIO_SUBTYPE_GPIO_4CH 0x1
#define PMIC_GPIO_SUBTYPE_GPIOC_4CH 0x5
#define PMIC_GPIO_SUBTYPE_GPIO_8CH 0x9
#define PMIC_GPIO_SUBTYPE_GPIOC_8CH 0xd
#define PMIC_GPIO_SUBTYPE_GPIO_LV 0x10
#define PMIC_GPIO_SUBTYPE_GPIO_MV 0x11
#define PMIC_MPP_REG_RT_STS 0x10
#define PMIC_MPP_REG_RT_STS_VAL_MASK 0x1
/* control register base address offsets */
#define PMIC_GPIO_REG_MODE_CTL 0x40
#define PMIC_GPIO_REG_DIG_VIN_CTL 0x41
#define PMIC_GPIO_REG_DIG_PULL_CTL 0x42
#define PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL 0x44
#define PMIC_GPIO_REG_DIG_IN_CTL 0x43
#define PMIC_GPIO_REG_DIG_OUT_CTL 0x45
#define PMIC_GPIO_REG_EN_CTL 0x46
#define PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL 0x4A
/* PMIC_GPIO_REG_MODE_CTL */
#define PMIC_GPIO_REG_MODE_VALUE_SHIFT 0x1
#define PMIC_GPIO_REG_MODE_FUNCTION_SHIFT 1
#define PMIC_GPIO_REG_MODE_FUNCTION_MASK 0x7
#define PMIC_GPIO_REG_MODE_DIR_SHIFT 4
#define PMIC_GPIO_REG_MODE_DIR_MASK 0x7
#define PMIC_GPIO_MODE_DIGITAL_INPUT 0
#define PMIC_GPIO_MODE_DIGITAL_OUTPUT 1
#define PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT 2
#define PMIC_GPIO_MODE_ANALOG_PASS_THRU 3
#define PMIC_GPIO_REG_LV_MV_MODE_DIR_MASK 0x3
/* PMIC_GPIO_REG_DIG_VIN_CTL */
#define PMIC_GPIO_REG_VIN_SHIFT 0
#define PMIC_GPIO_REG_VIN_MASK 0x7
/* PMIC_GPIO_REG_DIG_PULL_CTL */
#define PMIC_GPIO_REG_PULL_SHIFT 0
#define PMIC_GPIO_REG_PULL_MASK 0x7
#define PMIC_GPIO_PULL_DOWN 4
#define PMIC_GPIO_PULL_DISABLE 5
/* PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL for LV/MV */
#define PMIC_GPIO_LV_MV_OUTPUT_INVERT 0x80
#define PMIC_GPIO_LV_MV_OUTPUT_INVERT_SHIFT 7
#define PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK 0xF
/* PMIC_GPIO_REG_DIG_IN_CTL */
#define PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN 0x80
#define PMIC_GPIO_LV_MV_DIG_IN_DTEST_SEL_MASK 0x7
#define PMIC_GPIO_DIG_IN_DTEST_SEL_MASK 0xf
/* PMIC_GPIO_REG_DIG_OUT_CTL */
#define PMIC_GPIO_REG_OUT_STRENGTH_SHIFT 0
#define PMIC_GPIO_REG_OUT_STRENGTH_MASK 0x3
#define PMIC_GPIO_REG_OUT_TYPE_SHIFT 4
#define PMIC_GPIO_REG_OUT_TYPE_MASK 0x3
/*
* Output type - indicates pin should be configured as push-pull,
* open drain or open source.
*/
#define PMIC_GPIO_OUT_BUF_CMOS 0
#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS 1
#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS 2
/* PMIC_GPIO_REG_EN_CTL */
#define PMIC_GPIO_REG_MASTER_EN_SHIFT 7
#define PMIC_GPIO_PHYSICAL_OFFSET 1
/* PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL */
#define PMIC_GPIO_LV_MV_ANA_MUX_SEL_MASK 0x3
/* Qualcomm specific pin configurations */
#define PMIC_GPIO_CONF_PULL_UP (PIN_CONFIG_END + 1)
#define PMIC_GPIO_CONF_STRENGTH (PIN_CONFIG_END + 2)
#define PMIC_GPIO_CONF_ATEST (PIN_CONFIG_END + 3)
#define PMIC_GPIO_CONF_ANALOG_PASS (PIN_CONFIG_END + 4)
#define PMIC_GPIO_CONF_DTEST_BUFFER (PIN_CONFIG_END + 5)
/* The index of each function in pmic_gpio_functions[] array */
enum pmic_gpio_func_index {
PMIC_GPIO_FUNC_INDEX_NORMAL,
PMIC_GPIO_FUNC_INDEX_PAIRED,
PMIC_GPIO_FUNC_INDEX_FUNC1,
PMIC_GPIO_FUNC_INDEX_FUNC2,
PMIC_GPIO_FUNC_INDEX_FUNC3,
PMIC_GPIO_FUNC_INDEX_FUNC4,
PMIC_GPIO_FUNC_INDEX_DTEST1,
PMIC_GPIO_FUNC_INDEX_DTEST2,
PMIC_GPIO_FUNC_INDEX_DTEST3,
PMIC_GPIO_FUNC_INDEX_DTEST4,
};
/**
* struct pmic_gpio_pad - keep current GPIO settings
* @base: Address base in SPMI device.
* @irq: IRQ number which this GPIO generate.
* @is_enabled: Set to false when GPIO should be put in high Z state.
* @out_value: Cached pin output value
* @have_buffer: Set to true if GPIO output could be configured in push-pull,
* open-drain or open-source mode.
* @output_enabled: Set to true if GPIO output logic is enabled.
* @input_enabled: Set to true if GPIO input buffer logic is enabled.
* @analog_pass: Set to true if GPIO is in analog-pass-through mode.
* @lv_mv_type: Set to true if GPIO subtype is GPIO_LV(0x10) or GPIO_MV(0x11).
* @num_sources: Number of power-sources supported by this GPIO.
* @power_source: Current power-source used.
* @buffer_type: Push-pull, open-drain or open-source.
* @pullup: Constant current which flow trough GPIO output buffer.
* @strength: No, Low, Medium, High
* @function: See pmic_gpio_functions[]
* @atest: the ATEST selection for GPIO analog-pass-through mode
* @dtest_buffer: the DTEST buffer selection for digital input mode.
*/
struct pmic_gpio_pad {
u16 base;
int irq;
bool is_enabled;
bool out_value;
bool have_buffer;
bool output_enabled;
bool input_enabled;
bool analog_pass;
bool lv_mv_type;
unsigned int num_sources;
unsigned int power_source;
unsigned int buffer_type;
unsigned int pullup;
unsigned int strength;
unsigned int function;
unsigned int atest;
unsigned int dtest_buffer;
};
struct pmic_gpio_state {
struct device *dev;
struct regmap *map;
struct pinctrl_dev *ctrl;
struct gpio_chip chip;
};
static const struct pinconf_generic_params pmic_gpio_bindings[] = {
{"qcom,pull-up-strength", PMIC_GPIO_CONF_PULL_UP, 0},
{"qcom,drive-strength", PMIC_GPIO_CONF_STRENGTH, 0},
{"qcom,atest", PMIC_GPIO_CONF_ATEST, 0},
{"qcom,analog-pass", PMIC_GPIO_CONF_ANALOG_PASS, 0},
{"qcom,dtest-buffer", PMIC_GPIO_CONF_DTEST_BUFFER, 0},
};
#ifdef CONFIG_DEBUG_FS
static const struct pin_config_item pmic_conf_items[ARRAY_SIZE(pmic_gpio_bindings)] = {
PCONFDUMP(PMIC_GPIO_CONF_PULL_UP, "pull up strength", NULL, true),
PCONFDUMP(PMIC_GPIO_CONF_STRENGTH, "drive-strength", NULL, true),
PCONFDUMP(PMIC_GPIO_CONF_ATEST, "atest", NULL, true),
PCONFDUMP(PMIC_GPIO_CONF_ANALOG_PASS, "analog-pass", NULL, true),
PCONFDUMP(PMIC_GPIO_CONF_DTEST_BUFFER, "dtest-buffer", NULL, true),
};
#endif
static const char *const pmic_gpio_groups[] = {
"gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7", "gpio8",
"gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14", "gpio15",
"gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21", "gpio22",
"gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28", "gpio29",
"gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35", "gpio36",
};
static const char *const pmic_gpio_functions[] = {
[PMIC_GPIO_FUNC_INDEX_NORMAL] = PMIC_GPIO_FUNC_NORMAL,
[PMIC_GPIO_FUNC_INDEX_PAIRED] = PMIC_GPIO_FUNC_PAIRED,
[PMIC_GPIO_FUNC_INDEX_FUNC1] = PMIC_GPIO_FUNC_FUNC1,
[PMIC_GPIO_FUNC_INDEX_FUNC2] = PMIC_GPIO_FUNC_FUNC2,
[PMIC_GPIO_FUNC_INDEX_FUNC3] = PMIC_GPIO_FUNC_FUNC3,
[PMIC_GPIO_FUNC_INDEX_FUNC4] = PMIC_GPIO_FUNC_FUNC4,
[PMIC_GPIO_FUNC_INDEX_DTEST1] = PMIC_GPIO_FUNC_DTEST1,
[PMIC_GPIO_FUNC_INDEX_DTEST2] = PMIC_GPIO_FUNC_DTEST2,
[PMIC_GPIO_FUNC_INDEX_DTEST3] = PMIC_GPIO_FUNC_DTEST3,
[PMIC_GPIO_FUNC_INDEX_DTEST4] = PMIC_GPIO_FUNC_DTEST4,
};
static int pmic_gpio_read(struct pmic_gpio_state *state,
struct pmic_gpio_pad *pad, unsigned int addr)
{
unsigned int val;
int ret;
ret = regmap_read(state->map, pad->base + addr, &val);
if (ret < 0)
dev_err(state->dev, "read 0x%x failed\n", addr);
else
ret = val;
return ret;
}
static int pmic_gpio_write(struct pmic_gpio_state *state,
struct pmic_gpio_pad *pad, unsigned int addr,
unsigned int val)
{
int ret;
ret = regmap_write(state->map, pad->base + addr, val);
if (ret < 0)
dev_err(state->dev, "write 0x%x failed\n", addr);
return ret;
}
static int pmic_gpio_get_groups_count(struct pinctrl_dev *pctldev)
{
/* Every PIN is a group */
return pctldev->desc->npins;
}
static const char *pmic_gpio_get_group_name(struct pinctrl_dev *pctldev,
unsigned pin)
{
return pctldev->desc->pins[pin].name;
}
static int pmic_gpio_get_group_pins(struct pinctrl_dev *pctldev, unsigned pin,
const unsigned **pins, unsigned *num_pins)
{
*pins = &pctldev->desc->pins[pin].number;
*num_pins = 1;
return 0;
}
static const struct pinctrl_ops pmic_gpio_pinctrl_ops = {
.get_groups_count = pmic_gpio_get_groups_count,
.get_group_name = pmic_gpio_get_group_name,
.get_group_pins = pmic_gpio_get_group_pins,
.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
.dt_free_map = pinctrl_utils_free_map,
};
static int pmic_gpio_get_functions_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(pmic_gpio_functions);
}
static const char *pmic_gpio_get_function_name(struct pinctrl_dev *pctldev,
unsigned function)
{
return pmic_gpio_functions[function];
}
static int pmic_gpio_get_function_groups(struct pinctrl_dev *pctldev,
unsigned function,
const char *const **groups,
unsigned *const num_qgroups)
{
*groups = pmic_gpio_groups;
*num_qgroups = pctldev->desc->npins;
return 0;
}
static int pmic_gpio_set_mux(struct pinctrl_dev *pctldev, unsigned function,
unsigned pin)
{
struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev);
struct pmic_gpio_pad *pad;
unsigned int val;
int ret;
if (function > PMIC_GPIO_FUNC_INDEX_DTEST4) {
pr_err("function: %d is not defined\n", function);
return -EINVAL;
}
pad = pctldev->desc->pins[pin].drv_data;
/*
* Non-LV/MV subtypes only support 2 special functions,
* offsetting the dtestx function values by 2
*/
if (!pad->lv_mv_type) {
if (function == PMIC_GPIO_FUNC_INDEX_FUNC3 ||
function == PMIC_GPIO_FUNC_INDEX_FUNC4) {
pr_err("LV/MV subtype doesn't have func3/func4\n");
return -EINVAL;
}
if (function >= PMIC_GPIO_FUNC_INDEX_DTEST1)
function -= (PMIC_GPIO_FUNC_INDEX_DTEST1 -
PMIC_GPIO_FUNC_INDEX_FUNC3);
}
pad->function = function;
if (pad->analog_pass)
val = PMIC_GPIO_MODE_ANALOG_PASS_THRU;
else if (pad->output_enabled && pad->input_enabled)
val = PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT;
else if (pad->output_enabled)
val = PMIC_GPIO_MODE_DIGITAL_OUTPUT;
else
val = PMIC_GPIO_MODE_DIGITAL_INPUT;
if (pad->lv_mv_type) {
ret = pmic_gpio_write(state, pad,
PMIC_GPIO_REG_MODE_CTL, val);
if (ret < 0)
return ret;
val = pad->atest - 1;
ret = pmic_gpio_write(state, pad,
PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL, val);
if (ret < 0)
return ret;
val = pad->out_value
<< PMIC_GPIO_LV_MV_OUTPUT_INVERT_SHIFT;
val |= pad->function
& PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK;
ret = pmic_gpio_write(state, pad,
PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL, val);
if (ret < 0)
return ret;
} else {
val = val << PMIC_GPIO_REG_MODE_DIR_SHIFT;
val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT;
ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_MODE_CTL, val);
if (ret < 0)
return ret;
}
val = pad->is_enabled << PMIC_GPIO_REG_MASTER_EN_SHIFT;
return pmic_gpio_write(state, pad, PMIC_GPIO_REG_EN_CTL, val);
}
static const struct pinmux_ops pmic_gpio_pinmux_ops = {
.get_functions_count = pmic_gpio_get_functions_count,
.get_function_name = pmic_gpio_get_function_name,
.get_function_groups = pmic_gpio_get_function_groups,
.set_mux = pmic_gpio_set_mux,
};
static int pmic_gpio_config_get(struct pinctrl_dev *pctldev,
unsigned int pin, unsigned long *config)
{
unsigned param = pinconf_to_config_param(*config);
struct pmic_gpio_pad *pad;
unsigned arg;
pad = pctldev->desc->pins[pin].drv_data;
switch (param) {
case PIN_CONFIG_DRIVE_PUSH_PULL:
if (pad->buffer_type != PMIC_GPIO_OUT_BUF_CMOS)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
if (pad->buffer_type != PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_DRIVE_OPEN_SOURCE:
if (pad->buffer_type != PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (pad->pullup != PMIC_GPIO_PULL_DOWN)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_DISABLE:
if (pad->pullup != PMIC_GPIO_PULL_DISABLE)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_UP:
if (pad->pullup != PMIC_GPIO_PULL_UP_30)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
if (pad->is_enabled)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_POWER_SOURCE:
arg = pad->power_source;
break;
case PIN_CONFIG_INPUT_ENABLE:
if (!pad->input_enabled)
return -EINVAL;
arg = 1;
break;
case PIN_CONFIG_OUTPUT:
arg = pad->out_value;
break;
case PMIC_GPIO_CONF_PULL_UP:
arg = pad->pullup;
break;
case PMIC_GPIO_CONF_STRENGTH:
arg = pad->strength;
break;
case PMIC_GPIO_CONF_ATEST:
arg = pad->atest;
break;
case PMIC_GPIO_CONF_ANALOG_PASS:
arg = pad->analog_pass;
break;
case PMIC_GPIO_CONF_DTEST_BUFFER:
arg = pad->dtest_buffer;
break;
default:
return -EINVAL;
}
*config = pinconf_to_config_packed(param, arg);
return 0;
}
static int pmic_gpio_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *configs, unsigned nconfs)
{
struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev);
struct pmic_gpio_pad *pad;
unsigned param, arg;
unsigned int val;
int i, ret;
pad = pctldev->desc->pins[pin].drv_data;
pad->is_enabled = true;
for (i = 0; i < nconfs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
case PIN_CONFIG_DRIVE_PUSH_PULL:
pad->buffer_type = PMIC_GPIO_OUT_BUF_CMOS;
break;
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
if (!pad->have_buffer)
return -EINVAL;
pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS;
break;
case PIN_CONFIG_DRIVE_OPEN_SOURCE:
if (!pad->have_buffer)
return -EINVAL;
pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS;
break;
case PIN_CONFIG_BIAS_DISABLE:
pad->pullup = PMIC_GPIO_PULL_DISABLE;
break;
case PIN_CONFIG_BIAS_PULL_UP:
pad->pullup = PMIC_GPIO_PULL_UP_30;
break;
case PIN_CONFIG_BIAS_PULL_DOWN:
if (arg)
pad->pullup = PMIC_GPIO_PULL_DOWN;
else
pad->pullup = PMIC_GPIO_PULL_DISABLE;
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
pad->is_enabled = false;
break;
case PIN_CONFIG_POWER_SOURCE:
if (arg >= pad->num_sources)
return -EINVAL;
pad->power_source = arg;
break;
case PIN_CONFIG_INPUT_ENABLE:
pad->input_enabled = arg ? true : false;
break;
case PIN_CONFIG_OUTPUT:
pad->output_enabled = true;
pad->out_value = arg;
break;
case PMIC_GPIO_CONF_PULL_UP:
if (arg > PMIC_GPIO_PULL_UP_1P5_30)
return -EINVAL;
pad->pullup = arg;
break;
case PMIC_GPIO_CONF_STRENGTH:
if (arg > PMIC_GPIO_STRENGTH_LOW)
return -EINVAL;
pad->strength = arg;
break;
case PMIC_GPIO_CONF_ATEST:
if (!pad->lv_mv_type || arg > 4)
return -EINVAL;
pad->atest = arg;
break;
case PMIC_GPIO_CONF_ANALOG_PASS:
if (!pad->lv_mv_type)
return -EINVAL;
pad->analog_pass = true;
break;
case PMIC_GPIO_CONF_DTEST_BUFFER:
if (arg > 4)
return -EINVAL;
pad->dtest_buffer = arg;
break;
default:
return -EINVAL;
}
}
val = pad->power_source << PMIC_GPIO_REG_VIN_SHIFT;
ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_VIN_CTL, val);
if (ret < 0)
return ret;
val = pad->pullup << PMIC_GPIO_REG_PULL_SHIFT;
ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_PULL_CTL, val);
if (ret < 0)
return ret;
val = pad->buffer_type << PMIC_GPIO_REG_OUT_TYPE_SHIFT;
val |= pad->strength << PMIC_GPIO_REG_OUT_STRENGTH_SHIFT;
ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_OUT_CTL, val);
if (ret < 0)
return ret;
if (pad->dtest_buffer == 0) {
val = 0;
} else {
if (pad->lv_mv_type) {
val = pad->dtest_buffer - 1;
val |= PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN;
} else {
val = BIT(pad->dtest_buffer - 1);
}
}
ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_IN_CTL, val);
if (ret < 0)
return ret;
if (pad->analog_pass)
val = PMIC_GPIO_MODE_ANALOG_PASS_THRU;
else if (pad->output_enabled && pad->input_enabled)
val = PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT;
else if (pad->output_enabled)
val = PMIC_GPIO_MODE_DIGITAL_OUTPUT;
else
val = PMIC_GPIO_MODE_DIGITAL_INPUT;
if (pad->lv_mv_type) {
ret = pmic_gpio_write(state, pad,
PMIC_GPIO_REG_MODE_CTL, val);
if (ret < 0)
return ret;
val = pad->atest - 1;
ret = pmic_gpio_write(state, pad,
PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL, val);
if (ret < 0)
return ret;
val = pad->out_value
<< PMIC_GPIO_LV_MV_OUTPUT_INVERT_SHIFT;
val |= pad->function
& PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK;
ret = pmic_gpio_write(state, pad,
PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL, val);
if (ret < 0)
return ret;
} else {
val = val << PMIC_GPIO_REG_MODE_DIR_SHIFT;
val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT;
ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_MODE_CTL, val);
if (ret < 0)
return ret;
}
val = pad->is_enabled << PMIC_GPIO_REG_MASTER_EN_SHIFT;
ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_EN_CTL, val);
return ret;
}
static void pmic_gpio_config_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned pin)
{
struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev);
struct pmic_gpio_pad *pad;
int ret, val, function;
static const char *const biases[] = {
"pull-up 30uA", "pull-up 1.5uA", "pull-up 31.5uA",
"pull-up 1.5uA + 30uA boost", "pull-down 10uA", "no pull"
};
static const char *const buffer_types[] = {
"push-pull", "open-drain", "open-source"
};
static const char *const strengths[] = {
"no", "high", "medium", "low"
};
pad = pctldev->desc->pins[pin].drv_data;
seq_printf(s, " gpio%-2d:", pin + PMIC_GPIO_PHYSICAL_OFFSET);
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_EN_CTL);
if (val < 0 || !(val >> PMIC_GPIO_REG_MASTER_EN_SHIFT)) {
seq_puts(s, " ---");
} else {
if (pad->input_enabled) {
ret = pmic_gpio_read(state, pad, PMIC_MPP_REG_RT_STS);
if (ret < 0)
return;
ret &= PMIC_MPP_REG_RT_STS_VAL_MASK;
pad->out_value = ret;
}
/*
* For the non-LV/MV subtypes only 2 special functions are
* available, offsetting the dtest function values by 2.
*/
function = pad->function;
if (!pad->lv_mv_type &&
pad->function >= PMIC_GPIO_FUNC_INDEX_FUNC3)
function += PMIC_GPIO_FUNC_INDEX_DTEST1 -
PMIC_GPIO_FUNC_INDEX_FUNC3;
if (pad->analog_pass)
seq_puts(s, " analog-pass");
else
seq_printf(s, " %-4s",
pad->output_enabled ? "out" : "in");
seq_printf(s, " %-7s", pmic_gpio_functions[function]);
seq_printf(s, " vin-%d", pad->power_source);
seq_printf(s, " %-27s", biases[pad->pullup]);
seq_printf(s, " %-10s", buffer_types[pad->buffer_type]);
seq_printf(s, " %-4s", pad->out_value ? "high" : "low");
seq_printf(s, " %-7s", strengths[pad->strength]);
seq_printf(s, " atest-%d", pad->atest);
seq_printf(s, " dtest-%d", pad->dtest_buffer);
}
}
static const struct pinconf_ops pmic_gpio_pinconf_ops = {
.is_generic = true,
.pin_config_group_get = pmic_gpio_config_get,
.pin_config_group_set = pmic_gpio_config_set,
.pin_config_group_dbg_show = pmic_gpio_config_dbg_show,
};
static int pmic_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
{
struct pmic_gpio_state *state = gpiochip_get_data(chip);
unsigned long config;
config = pinconf_to_config_packed(PIN_CONFIG_INPUT_ENABLE, 1);
return pmic_gpio_config_set(state->ctrl, pin, &config, 1);
}
static int pmic_gpio_direction_output(struct gpio_chip *chip,
unsigned pin, int val)
{
struct pmic_gpio_state *state = gpiochip_get_data(chip);
unsigned long config;
config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, val);
return pmic_gpio_config_set(state->ctrl, pin, &config, 1);
}
static int pmic_gpio_get(struct gpio_chip *chip, unsigned pin)
{
struct pmic_gpio_state *state = gpiochip_get_data(chip);
struct pmic_gpio_pad *pad;
int ret;
pad = state->ctrl->desc->pins[pin].drv_data;
if (!pad->is_enabled)
return -EINVAL;
if (pad->input_enabled) {
ret = pmic_gpio_read(state, pad, PMIC_MPP_REG_RT_STS);
if (ret < 0)
return ret;
pad->out_value = ret & PMIC_MPP_REG_RT_STS_VAL_MASK;
}
return !!pad->out_value;
}
static void pmic_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
{
struct pmic_gpio_state *state = gpiochip_get_data(chip);
unsigned long config;
config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, value);
pmic_gpio_config_set(state->ctrl, pin, &config, 1);
}
static int pmic_gpio_of_xlate(struct gpio_chip *chip,
const struct of_phandle_args *gpio_desc,
u32 *flags)
{
if (chip->of_gpio_n_cells < 2)
return -EINVAL;
if (flags)
*flags = gpio_desc->args[1];
return gpio_desc->args[0] - PMIC_GPIO_PHYSICAL_OFFSET;
}
static int pmic_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
{
struct pmic_gpio_state *state = gpiochip_get_data(chip);
struct pmic_gpio_pad *pad;
pad = state->ctrl->desc->pins[pin].drv_data;
return pad->irq;
}
static void pmic_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
struct pmic_gpio_state *state = gpiochip_get_data(chip);
unsigned i;
for (i = 0; i < chip->ngpio; i++) {
pmic_gpio_config_dbg_show(state->ctrl, s, i);
seq_puts(s, "\n");
}
}
static const struct gpio_chip pmic_gpio_gpio_template = {
.direction_input = pmic_gpio_direction_input,
.direction_output = pmic_gpio_direction_output,
.get = pmic_gpio_get,
.set = pmic_gpio_set,
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.of_xlate = pmic_gpio_of_xlate,
.to_irq = pmic_gpio_to_irq,
.dbg_show = pmic_gpio_dbg_show,
};
static int pmic_gpio_populate(struct pmic_gpio_state *state,
struct pmic_gpio_pad *pad)
{
int type, subtype, val, dir;
type = pmic_gpio_read(state, pad, PMIC_GPIO_REG_TYPE);
if (type < 0)
return type;
if (type != PMIC_GPIO_TYPE) {
dev_err(state->dev, "incorrect block type 0x%x at 0x%x\n",
type, pad->base);
return -ENODEV;
}
subtype = pmic_gpio_read(state, pad, PMIC_GPIO_REG_SUBTYPE);
if (subtype < 0)
return subtype;
switch (subtype) {
case PMIC_GPIO_SUBTYPE_GPIO_4CH:
pad->have_buffer = true;
case PMIC_GPIO_SUBTYPE_GPIOC_4CH:
pad->num_sources = 4;
break;
case PMIC_GPIO_SUBTYPE_GPIO_8CH:
pad->have_buffer = true;
case PMIC_GPIO_SUBTYPE_GPIOC_8CH:
pad->num_sources = 8;
break;
case PMIC_GPIO_SUBTYPE_GPIO_LV:
pad->num_sources = 1;
pad->have_buffer = true;
pad->lv_mv_type = true;
break;
case PMIC_GPIO_SUBTYPE_GPIO_MV:
pad->num_sources = 2;
pad->have_buffer = true;
pad->lv_mv_type = true;
break;
default:
dev_err(state->dev, "unknown GPIO type 0x%x\n", subtype);
return -ENODEV;
}
if (pad->lv_mv_type) {
val = pmic_gpio_read(state, pad,
PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL);
if (val < 0)
return val;
pad->out_value = !!(val & PMIC_GPIO_LV_MV_OUTPUT_INVERT);
pad->function = val & PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK;
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_MODE_CTL);
if (val < 0)
return val;
dir = val & PMIC_GPIO_REG_LV_MV_MODE_DIR_MASK;
} else {
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_MODE_CTL);
if (val < 0)
return val;
pad->out_value = val & PMIC_GPIO_REG_MODE_VALUE_SHIFT;
dir = val >> PMIC_GPIO_REG_MODE_DIR_SHIFT;
dir &= PMIC_GPIO_REG_MODE_DIR_MASK;
pad->function = val >> PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
pad->function &= PMIC_GPIO_REG_MODE_FUNCTION_MASK;
}
switch (dir) {
case PMIC_GPIO_MODE_DIGITAL_INPUT:
pad->input_enabled = true;
pad->output_enabled = false;
break;
case PMIC_GPIO_MODE_DIGITAL_OUTPUT:
pad->input_enabled = false;
pad->output_enabled = true;
break;
case PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT:
pad->input_enabled = true;
pad->output_enabled = true;
break;
case PMIC_GPIO_MODE_ANALOG_PASS_THRU:
if (!pad->lv_mv_type)
return -ENODEV;
pad->analog_pass = true;
break;
default:
dev_err(state->dev, "unknown GPIO direction\n");
return -ENODEV;
}
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_VIN_CTL);
if (val < 0)
return val;
pad->power_source = val >> PMIC_GPIO_REG_VIN_SHIFT;
pad->power_source &= PMIC_GPIO_REG_VIN_MASK;
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_PULL_CTL);
if (val < 0)
return val;
pad->pullup = val >> PMIC_GPIO_REG_PULL_SHIFT;
pad->pullup &= PMIC_GPIO_REG_PULL_MASK;
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_IN_CTL);
if (val < 0)
return val;
if (pad->lv_mv_type && (val & PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN))
pad->dtest_buffer =
(val & PMIC_GPIO_LV_MV_DIG_IN_DTEST_SEL_MASK) + 1;
else if (!pad->lv_mv_type)
pad->dtest_buffer = ffs(val);
else
pad->dtest_buffer = 0;
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_OUT_CTL);
if (val < 0)
return val;
pad->strength = val >> PMIC_GPIO_REG_OUT_STRENGTH_SHIFT;
pad->strength &= PMIC_GPIO_REG_OUT_STRENGTH_MASK;
pad->buffer_type = val >> PMIC_GPIO_REG_OUT_TYPE_SHIFT;
pad->buffer_type &= PMIC_GPIO_REG_OUT_TYPE_MASK;
if (pad->lv_mv_type) {
val = pmic_gpio_read(state, pad,
PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL);
if (val < 0)
return val;
pad->atest = (val & PMIC_GPIO_LV_MV_ANA_MUX_SEL_MASK) + 1;
}
/* Pin could be disabled with PIN_CONFIG_BIAS_HIGH_IMPEDANCE */
pad->is_enabled = true;
return 0;
}
static int pmic_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct pinctrl_pin_desc *pindesc;
struct pinctrl_desc *pctrldesc;
struct pmic_gpio_pad *pad, *pads;
struct pmic_gpio_state *state;
int ret, npins, i;
u32 reg;
ret = of_property_read_u32(dev->of_node, "reg", &reg);
if (ret < 0) {
dev_err(dev, "missing base address");
return ret;
}
npins = platform_irq_count(pdev);
if (!npins)
return -EINVAL;
if (npins < 0)
return npins;
BUG_ON(npins > ARRAY_SIZE(pmic_gpio_groups));
state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
platform_set_drvdata(pdev, state);
state->dev = &pdev->dev;
state->map = dev_get_regmap(dev->parent, NULL);
pindesc = devm_kcalloc(dev, npins, sizeof(*pindesc), GFP_KERNEL);
if (!pindesc)
return -ENOMEM;
pads = devm_kcalloc(dev, npins, sizeof(*pads), GFP_KERNEL);
if (!pads)
return -ENOMEM;
pctrldesc = devm_kzalloc(dev, sizeof(*pctrldesc), GFP_KERNEL);
if (!pctrldesc)
return -ENOMEM;
pctrldesc->pctlops = &pmic_gpio_pinctrl_ops;
pctrldesc->pmxops = &pmic_gpio_pinmux_ops;
pctrldesc->confops = &pmic_gpio_pinconf_ops;
pctrldesc->owner = THIS_MODULE;
pctrldesc->name = dev_name(dev);
pctrldesc->pins = pindesc;
pctrldesc->npins = npins;
pctrldesc->num_custom_params = ARRAY_SIZE(pmic_gpio_bindings);
pctrldesc->custom_params = pmic_gpio_bindings;
#ifdef CONFIG_DEBUG_FS
pctrldesc->custom_conf_items = pmic_conf_items;
#endif
for (i = 0; i < npins; i++, pindesc++) {
pad = &pads[i];
pindesc->drv_data = pad;
pindesc->number = i;
pindesc->name = pmic_gpio_groups[i];
pad->irq = platform_get_irq(pdev, i);
if (pad->irq < 0)
return pad->irq;
pad->base = reg + i * PMIC_GPIO_ADDRESS_RANGE;
ret = pmic_gpio_populate(state, pad);
if (ret < 0)
return ret;
}
state->chip = pmic_gpio_gpio_template;
state->chip.parent = dev;
state->chip.base = -1;
state->chip.ngpio = npins;
state->chip.label = dev_name(dev);
state->chip.of_gpio_n_cells = 2;
state->chip.can_sleep = false;
state->ctrl = devm_pinctrl_register(dev, pctrldesc, state);
if (IS_ERR(state->ctrl))
return PTR_ERR(state->ctrl);
ret = gpiochip_add_data(&state->chip, state);
if (ret) {
dev_err(state->dev, "can't add gpio chip\n");
return ret;
}
/*
* For DeviceTree-supported systems, the gpio core checks the
* pinctrl's device node for the "gpio-ranges" property.
* If it is present, it takes care of adding the pin ranges
* for the driver. In this case the driver can skip ahead.
*
* In order to remain compatible with older, existing DeviceTree
* files which don't set the "gpio-ranges" property or systems that
* utilize ACPI the driver has to call gpiochip_add_pin_range().
*/
if (!of_property_read_bool(dev->of_node, "gpio-ranges")) {
ret = gpiochip_add_pin_range(&state->chip, dev_name(dev), 0, 0,
npins);
if (ret) {
dev_err(dev, "failed to add pin range\n");
goto err_range;
}
}
return 0;
err_range:
gpiochip_remove(&state->chip);
return ret;
}
static int pmic_gpio_remove(struct platform_device *pdev)
{
struct pmic_gpio_state *state = platform_get_drvdata(pdev);
gpiochip_remove(&state->chip);
return 0;
}
static const struct of_device_id pmic_gpio_of_match[] = {
{ .compatible = "qcom,pm8916-gpio" }, /* 4 GPIO's */
{ .compatible = "qcom,pm8941-gpio" }, /* 36 GPIO's */
{ .compatible = "qcom,pm8994-gpio" }, /* 22 GPIO's */
{ .compatible = "qcom,pmi8994-gpio" }, /* 10 GPIO's */
{ .compatible = "qcom,pma8084-gpio" }, /* 22 GPIO's */
{ .compatible = "qcom,spmi-gpio" }, /* Generic */
{ },
};
MODULE_DEVICE_TABLE(of, pmic_gpio_of_match);
static struct platform_driver pmic_gpio_driver = {
.driver = {
.name = "qcom-spmi-gpio",
.of_match_table = pmic_gpio_of_match,
},
.probe = pmic_gpio_probe,
.remove = pmic_gpio_remove,
};
module_platform_driver(pmic_gpio_driver);
MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
MODULE_DESCRIPTION("Qualcomm SPMI PMIC GPIO pin control driver");
MODULE_ALIAS("platform:qcom-spmi-gpio");
MODULE_LICENSE("GPL v2");
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