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u-boot/drivers/gpio/pm8916_gpio.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

301 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Qualcomm pm8916 pmic gpio driver - part of Qualcomm PM8916 PMIC
*
* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <power/pmic.h>
#include <spmi/spmi.h>
#include <asm/io.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 pm8916 peripherals */
#define REG_TYPE 0x4
#define REG_SUBTYPE 0x5
#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_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_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)
struct pm8916_gpio_bank {
uint32_t pid; /* Peripheral ID on SPMI bus */
};
static int pm8916_gpio_set_direction(struct udevice *dev, unsigned offset,
bool input, int value)
{
struct pm8916_gpio_bank *priv = dev_get_priv(dev);
uint32_t gpio_base = priv->pid + REG_OFFSET(offset);
int ret;
/* Disable the GPIO */
ret = pmic_clrsetbits(dev->parent, gpio_base + REG_EN_CTL,
REG_EN_CTL_ENABLE, 0);
if (ret < 0)
return ret;
/* Select the mode */
if (input)
ret = pmic_reg_write(dev->parent, gpio_base + REG_CTL,
REG_CTL_MODE_INPUT);
else
ret = pmic_reg_write(dev->parent, gpio_base + REG_CTL,
REG_CTL_MODE_INOUT | (value ? 1 : 0));
if (ret < 0)
return ret;
/* Set the right pull (no pull) */
ret = pmic_reg_write(dev->parent, 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(dev->parent, 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(dev->parent, 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 pm8916_gpio_direction_input(struct udevice *dev, unsigned offset)
{
return pm8916_gpio_set_direction(dev, offset, true, 0);
}
static int pm8916_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
return pm8916_gpio_set_direction(dev, offset, false, value);
}
static int pm8916_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct pm8916_gpio_bank *priv = dev_get_priv(dev);
uint32_t gpio_base = priv->pid + REG_OFFSET(offset);
int reg;
/* Set the output value of the gpio */
reg = pmic_reg_read(dev->parent, gpio_base + REG_CTL);
if (reg < 0)
return reg;
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 pm8916_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct pm8916_gpio_bank *priv = dev_get_priv(dev);
uint32_t gpio_base = priv->pid + REG_OFFSET(offset);
int reg;
reg = pmic_reg_read(dev->parent, gpio_base + REG_STATUS);
if (reg < 0)
return reg;
return !!(reg & REG_STATUS_VAL_MASK);
}
static int pm8916_gpio_set_value(struct udevice *dev, unsigned offset,
int value)
{
struct pm8916_gpio_bank *priv = dev_get_priv(dev);
uint32_t gpio_base = priv->pid + REG_OFFSET(offset);
/* Set the output value of the gpio */
return pmic_clrsetbits(dev->parent, gpio_base + REG_CTL,
REG_CTL_OUTPUT_MASK, !!value);
}
static const struct dm_gpio_ops pm8916_gpio_ops = {
.direction_input = pm8916_gpio_direction_input,
.direction_output = pm8916_gpio_direction_output,
.get_value = pm8916_gpio_get_value,
.set_value = pm8916_gpio_set_value,
.get_function = pm8916_gpio_get_function,
};
static int pm8916_gpio_probe(struct udevice *dev)
{
struct pm8916_gpio_bank *priv = dev_get_priv(dev);
int reg;
priv->pid = dev_read_addr(dev);
if (priv->pid == FDT_ADDR_T_NONE)
return -EINVAL;
/* Do a sanity check */
reg = pmic_reg_read(dev->parent, priv->pid + REG_TYPE);
if (reg != 0x10)
return -ENODEV;
reg = pmic_reg_read(dev->parent, priv->pid + REG_SUBTYPE);
if (reg != 0x5 && reg != 0x1)
return -ENODEV;
return 0;
}
static int pm8916_gpio_ofdata_to_platdata(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->gpio_count = dev_read_u32_default(dev, "gpio-count", 0);
uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
if (uc_priv->bank_name == NULL)
uc_priv->bank_name = "pm8916";
return 0;
}
static const struct udevice_id pm8916_gpio_ids[] = {
{ .compatible = "qcom,pm8916-gpio" },
{ .compatible = "qcom,pm8994-gpio" }, /* 22 GPIO's */
{ }
};
U_BOOT_DRIVER(gpio_pm8916) = {
.name = "gpio_pm8916",
.id = UCLASS_GPIO,
.of_match = pm8916_gpio_ids,
.ofdata_to_platdata = pm8916_gpio_ofdata_to_platdata,
.probe = pm8916_gpio_probe,
.ops = &pm8916_gpio_ops,
.priv_auto_alloc_size = sizeof(struct pm8916_gpio_bank),
};
/* Add pmic buttons as GPIO as well - there is no generic way for now */
#define PON_INT_RT_STS 0x10
#define KPDPWR_ON_INT_BIT 0
#define RESIN_ON_INT_BIT 1
static int pm8941_pwrkey_get_function(struct udevice *dev, unsigned offset)
{
return GPIOF_INPUT;
}
static int pm8941_pwrkey_get_value(struct udevice *dev, unsigned offset)
{
struct pm8916_gpio_bank *priv = dev_get_priv(dev);
int reg = pmic_reg_read(dev->parent, priv->pid + PON_INT_RT_STS);
if (reg < 0)
return 0;
switch (offset) {
case 0: /* Power button */
return (reg & BIT(KPDPWR_ON_INT_BIT)) != 0;
break;
case 1: /* Reset button */
default:
return (reg & BIT(RESIN_ON_INT_BIT)) != 0;
break;
}
}
static const struct dm_gpio_ops pm8941_pwrkey_ops = {
.get_value = pm8941_pwrkey_get_value,
.get_function = pm8941_pwrkey_get_function,
};
static int pm8941_pwrkey_probe(struct udevice *dev)
{
struct pm8916_gpio_bank *priv = dev_get_priv(dev);
int reg;
priv->pid = devfdt_get_addr(dev);
if (priv->pid == FDT_ADDR_T_NONE)
return -EINVAL;
/* Do a sanity check */
reg = pmic_reg_read(dev->parent, priv->pid + REG_TYPE);
if (reg != 0x1)
return -ENODEV;
reg = pmic_reg_read(dev->parent, priv->pid + REG_SUBTYPE);
if (reg != 0x1)
return -ENODEV;
return 0;
}
static int pm8941_pwrkey_ofdata_to_platdata(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->gpio_count = 2;
uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
if (uc_priv->bank_name == NULL)
uc_priv->bank_name = "pm8916_key";
return 0;
}
static const struct udevice_id pm8941_pwrkey_ids[] = {
{ .compatible = "qcom,pm8916-pwrkey" },
{ .compatible = "qcom,pm8994-pwrkey" },
{ }
};
U_BOOT_DRIVER(pwrkey_pm8941) = {
.name = "pwrkey_pm8916",
.id = UCLASS_GPIO,
.of_match = pm8941_pwrkey_ids,
.ofdata_to_platdata = pm8941_pwrkey_ofdata_to_platdata,
.probe = pm8941_pwrkey_probe,
.ops = &pm8941_pwrkey_ops,
.priv_auto_alloc_size = sizeof(struct pm8916_gpio_bank),
};
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