blob: 14a8210522bffddb9e7cd778ceb3de54517b2dc9 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Qualcomm generic pmic gpio driver
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/pinctrl.h>
#include <log.h>
#include <power/pmic.h>
#include <spmi/spmi.h>
#include <asm/io.h>
#include <stdlib.h>
#include <asm/gpio.h>
#include <linux/bitops.h>
/* Register offset for each gpio */
#define REG_OFFSET(x) ((x) * 0x100)
/* Register maps */
/* Type and subtype are shared for all PMIC peripherals */
#define REG_TYPE 0x4
#define REG_SUBTYPE 0x5
/* GPIO peripheral type and subtype out_values */
#define REG_TYPE_VAL 0x10
#define REG_SUBTYPE_GPIO_4CH 0x1
#define REG_SUBTYPE_GPIOC_4CH 0x5
#define REG_SUBTYPE_GPIO_8CH 0x9
#define REG_SUBTYPE_GPIOC_8CH 0xd
#define REG_SUBTYPE_GPIO_LV 0x10
#define REG_SUBTYPE_GPIO_MV 0x11
#define REG_STATUS 0x08
#define REG_STATUS_VAL_MASK 0x1
/* MODE_CTL */
#define REG_CTL 0x40
#define REG_CTL_MODE_MASK 0x70
#define REG_CTL_MODE_INPUT 0x00
#define REG_CTL_MODE_INOUT 0x20
#define REG_CTL_MODE_OUTPUT 0x10
#define REG_CTL_OUTPUT_MASK 0x0F
#define REG_CTL_LV_MV_MODE_MASK 0x3
#define REG_CTL_LV_MV_MODE_INPUT 0x0
#define REG_CTL_LV_MV_MODE_INOUT 0x2
#define REG_CTL_LV_MV_MODE_OUTPUT 0x1
#define REG_DIG_VIN_CTL 0x41
#define REG_DIG_VIN_VIN0 0
#define REG_DIG_PULL_CTL 0x42
#define REG_DIG_PULL_NO_PU 0x5
#define REG_LV_MV_OUTPUT_CTL 0x44
#define REG_LV_MV_OUTPUT_CTL_MASK 0x80
#define REG_LV_MV_OUTPUT_CTL_SHIFT 7
#define REG_DIG_OUT_CTL 0x45
#define REG_DIG_OUT_CTL_CMOS (0x0 << 4)
#define REG_DIG_OUT_CTL_DRIVE_L 0x1
#define REG_EN_CTL 0x46
#define REG_EN_CTL_ENABLE (1 << 7)
/**
* pmic_gpio_match_data - platform specific configuration
*
* @PMIC_MATCH_READONLY: treat all GPIOs as readonly, don't attempt to configure them.
* This is a workaround for an unknown bug on some platforms where trying to write the
* GPIO configuration registers causes the board to hang.
*/
enum pmic_gpio_quirks {
QCOM_PMIC_QUIRK_READONLY = (1 << 0),
};
struct qcom_pmic_gpio_data {
uint32_t pid; /* Peripheral ID on SPMI bus */
bool lv_mv_type; /* If subtype is GPIO_LV(0x10) or GPIO_MV(0x11) */
u32 pin_count;
struct udevice *pmic; /* Reference to pmic device for read/write */
};
/* dev can be the GPIO or pinctrl device */
static int _qcom_gpio_set_direction(struct udevice *dev, u32 offset, bool input, int value)
{
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
u32 gpio_base = plat->pid + REG_OFFSET(offset);
u32 reg_ctl_val;
int ret = 0;
/* Select the mode and output */
if (plat->lv_mv_type) {
if (input)
reg_ctl_val = REG_CTL_LV_MV_MODE_INPUT;
else
reg_ctl_val = REG_CTL_LV_MV_MODE_INOUT;
} else {
if (input)
reg_ctl_val = REG_CTL_MODE_INPUT;
else
reg_ctl_val = REG_CTL_MODE_INOUT | !!value;
}
ret = pmic_reg_write(plat->pmic, gpio_base + REG_CTL, reg_ctl_val);
if (ret < 0)
return ret;
if (plat->lv_mv_type && !input) {
ret = pmic_reg_write(plat->pmic,
gpio_base + REG_LV_MV_OUTPUT_CTL,
!!value << REG_LV_MV_OUTPUT_CTL_SHIFT);
if (ret < 0)
return ret;
}
return 0;
}
static int qcom_gpio_set_direction(struct udevice *dev, unsigned int offset,
bool input, int value)
{
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
uint32_t gpio_base = plat->pid + REG_OFFSET(offset);
ulong quirks = dev_get_driver_data(dev);
int ret = 0;
/* Some PMICs don't like their GPIOs being configured */
if (quirks & QCOM_PMIC_QUIRK_READONLY)
return 0;
/* Disable the GPIO */
ret = pmic_clrsetbits(dev->parent, gpio_base + REG_EN_CTL,
REG_EN_CTL_ENABLE, 0);
if (ret < 0)
return ret;
_qcom_gpio_set_direction(dev, offset, input, value);
/* Set the right pull (no pull) */
ret = pmic_reg_write(plat->pmic, gpio_base + REG_DIG_PULL_CTL,
REG_DIG_PULL_NO_PU);
if (ret < 0)
return ret;
/* Configure output pin drivers if needed */
if (!input) {
/* Select the VIN - VIN0, pin is input so it doesn't matter */
ret = pmic_reg_write(plat->pmic, gpio_base + REG_DIG_VIN_CTL,
REG_DIG_VIN_VIN0);
if (ret < 0)
return ret;
/* Set the right dig out control */
ret = pmic_reg_write(plat->pmic, gpio_base + REG_DIG_OUT_CTL,
REG_DIG_OUT_CTL_CMOS |
REG_DIG_OUT_CTL_DRIVE_L);
if (ret < 0)
return ret;
}
/* Enable the GPIO */
return pmic_clrsetbits(dev->parent, gpio_base + REG_EN_CTL, 0,
REG_EN_CTL_ENABLE);
}
static int qcom_gpio_direction_input(struct udevice *dev, unsigned offset)
{
return qcom_gpio_set_direction(dev, offset, true, 0);
}
static int qcom_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
return qcom_gpio_set_direction(dev, offset, false, value);
}
static int qcom_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
uint32_t gpio_base = plat->pid + REG_OFFSET(offset);
int reg;
reg = pmic_reg_read(plat->pmic, gpio_base + REG_CTL);
if (reg < 0)
return reg;
if (plat->lv_mv_type) {
switch (reg & REG_CTL_LV_MV_MODE_MASK) {
case REG_CTL_LV_MV_MODE_INPUT:
return GPIOF_INPUT;
case REG_CTL_LV_MV_MODE_INOUT: /* Fallthrough */
case REG_CTL_LV_MV_MODE_OUTPUT:
return GPIOF_OUTPUT;
default:
return GPIOF_UNKNOWN;
}
} else {
switch (reg & REG_CTL_MODE_MASK) {
case REG_CTL_MODE_INPUT:
return GPIOF_INPUT;
case REG_CTL_MODE_INOUT: /* Fallthrough */
case REG_CTL_MODE_OUTPUT:
return GPIOF_OUTPUT;
default:
return GPIOF_UNKNOWN;
}
}
}
static int qcom_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
uint32_t gpio_base = plat->pid + REG_OFFSET(offset);
int reg;
reg = pmic_reg_read(plat->pmic, gpio_base + REG_STATUS);
if (reg < 0)
return reg;
return !!(reg & REG_STATUS_VAL_MASK);
}
static int qcom_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
uint32_t gpio_base = plat->pid + REG_OFFSET(offset);
/* Set the output value of the gpio */
if (plat->lv_mv_type)
return pmic_clrsetbits(dev->parent,
gpio_base + REG_LV_MV_OUTPUT_CTL,
REG_LV_MV_OUTPUT_CTL_MASK,
!!value << REG_LV_MV_OUTPUT_CTL_SHIFT);
else
return pmic_clrsetbits(dev->parent, gpio_base + REG_CTL,
REG_CTL_OUTPUT_MASK, !!value);
}
static int qcom_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (args->args_count < 1)
return -EINVAL;
/* GPIOs in DT are 1-based */
desc->offset = args->args[0] - 1;
if (desc->offset >= uc_priv->gpio_count)
return -EINVAL;
if (args->args_count < 2)
return 0;
desc->flags = gpio_flags_xlate(args->args[1]);
return 0;
}
static const struct dm_gpio_ops qcom_gpio_ops = {
.direction_input = qcom_gpio_direction_input,
.direction_output = qcom_gpio_direction_output,
.get_value = qcom_gpio_get_value,
.set_value = qcom_gpio_set_value,
.get_function = qcom_gpio_get_function,
.xlate = qcom_gpio_xlate,
};
static int qcom_gpio_bind(struct udevice *dev)
{
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
ulong quirks = dev_get_driver_data(dev);
struct udevice *child;
struct driver *drv;
int ret;
drv = lists_driver_lookup_name("qcom_pmic_pinctrl");
if (!drv) {
log_warning("Cannot find driver '%s'\n", "qcom_pmic_pinctrl");
return -ENOENT;
}
/* Bind the GPIO driver as a child of the PMIC. */
ret = device_bind_with_driver_data(dev, drv,
dev->name,
quirks, dev_ofnode(dev), &child);
if (ret)
return log_msg_ret("bind", ret);
dev_set_plat(child, plat);
return 0;
}
static int qcom_gpio_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
struct ofnode_phandle_args args;
int val, ret;
u64 pid;
plat->pmic = dev->parent;
pid = dev_read_addr(dev);
if (pid == FDT_ADDR_T_NONE)
return log_msg_ret("bad address", -EINVAL);
plat->pid = pid;
/* Do a sanity check */
val = pmic_reg_read(plat->pmic, plat->pid + REG_TYPE);
if (val != REG_TYPE_VAL)
return log_msg_ret("bad type", -ENXIO);
val = pmic_reg_read(plat->pmic, plat->pid + REG_SUBTYPE);
if (val != REG_SUBTYPE_GPIO_4CH && val != REG_SUBTYPE_GPIOC_4CH &&
val != REG_SUBTYPE_GPIO_LV && val != REG_SUBTYPE_GPIO_MV)
return log_msg_ret("bad subtype", -ENXIO);
plat->lv_mv_type = val == REG_SUBTYPE_GPIO_LV ||
val == REG_SUBTYPE_GPIO_MV;
/*
* Parse basic GPIO count specified via the gpio-ranges property
* as specified in upstream devicetrees
*/
ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), "gpio-ranges",
NULL, 3, 0, &args);
if (ret)
return log_msg_ret("gpio-ranges", ret);
plat->pin_count = args.args[2];
uc_priv->gpio_count = plat->pin_count;
uc_priv->bank_name = "pmic";
return 0;
}
static const struct udevice_id qcom_gpio_ids[] = {
{ .compatible = "qcom,pm8916-gpio" },
{ .compatible = "qcom,pm8994-gpio" }, /* 22 GPIO's */
{ .compatible = "qcom,pm8998-gpio", .data = QCOM_PMIC_QUIRK_READONLY },
{ .compatible = "qcom,pms405-gpio" },
{ }
};
U_BOOT_DRIVER(qcom_pmic_gpio) = {
.name = "qcom_pmic_gpio",
.id = UCLASS_GPIO,
.of_match = qcom_gpio_ids,
.bind = qcom_gpio_bind,
.probe = qcom_gpio_probe,
.ops = &qcom_gpio_ops,
.plat_auto = sizeof(struct qcom_pmic_gpio_data),
.flags = DM_FLAG_ALLOC_PDATA,
};
static const struct pinconf_param qcom_pmic_pinctrl_conf_params[] = {
{ "output-high", PIN_CONFIG_OUTPUT_ENABLE, 1 },
{ "output-low", PIN_CONFIG_OUTPUT, 0 },
};
static int qcom_pmic_pinctrl_get_pins_count(struct udevice *dev)
{
struct qcom_pmic_gpio_data *plat = dev_get_plat(dev);
return plat->pin_count;
}
static const char *qcom_pmic_pinctrl_get_pin_name(struct udevice *dev, unsigned int selector)
{
static char name[8];
/* DT indexes from 1 */
snprintf(name, sizeof(name), "gpio%u", selector + 1);
return name;
}
static int qcom_pmic_pinctrl_pinconf_set(struct udevice *dev, unsigned int selector,
unsigned int param, unsigned int arg)
{
/* We only support configuring the pin as an output, either low or high */
return _qcom_gpio_set_direction(dev, selector, false,
param == PIN_CONFIG_OUTPUT_ENABLE);
}
static const char *qcom_pmic_pinctrl_get_function_name(struct udevice *dev, unsigned int selector)
{
if (!selector)
return "normal";
return NULL;
}
static int qcom_pmic_pinctrl_generic_get_functions_count(struct udevice *dev)
{
return 1;
}
static int qcom_pmic_pinctrl_generic_pinmux_set_mux(struct udevice *dev, unsigned int selector,
unsigned int func_selector)
{
return 0;
}
struct pinctrl_ops qcom_pmic_pinctrl_ops = {
.get_pins_count = qcom_pmic_pinctrl_get_pins_count,
.get_pin_name = qcom_pmic_pinctrl_get_pin_name,
.set_state = pinctrl_generic_set_state,
.pinconf_num_params = ARRAY_SIZE(qcom_pmic_pinctrl_conf_params),
.pinconf_params = qcom_pmic_pinctrl_conf_params,
.pinconf_set = qcom_pmic_pinctrl_pinconf_set,
.get_function_name = qcom_pmic_pinctrl_get_function_name,
.get_functions_count = qcom_pmic_pinctrl_generic_get_functions_count,
.pinmux_set = qcom_pmic_pinctrl_generic_pinmux_set_mux,
};
U_BOOT_DRIVER(qcom_pmic_pinctrl) = {
.name = "qcom_pmic_pinctrl",
.id = UCLASS_PINCTRL,
.ops = &qcom_pmic_pinctrl_ops,
};