blob: ea715582bcf34ab0213473aa48caf1c47adc0811 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* arch/arm/mach-tegra/gpio.c
*
* Copyright (c) 2010 Google, Inc
* Copyright (c) 2011-2016, NVIDIA CORPORATION. All rights reserved.
*
* Author:
* Erik Gilling <konkers@google.com>
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/gpio/driver.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm.h>
#define GPIO_BANK(x) ((x) >> 5)
#define GPIO_PORT(x) (((x) >> 3) & 0x3)
#define GPIO_BIT(x) ((x) & 0x7)
#define GPIO_REG(tgi, x) (GPIO_BANK(x) * tgi->soc->bank_stride + \
GPIO_PORT(x) * 4)
#define GPIO_CNF(t, x) (GPIO_REG(t, x) + 0x00)
#define GPIO_OE(t, x) (GPIO_REG(t, x) + 0x10)
#define GPIO_OUT(t, x) (GPIO_REG(t, x) + 0X20)
#define GPIO_IN(t, x) (GPIO_REG(t, x) + 0x30)
#define GPIO_INT_STA(t, x) (GPIO_REG(t, x) + 0x40)
#define GPIO_INT_ENB(t, x) (GPIO_REG(t, x) + 0x50)
#define GPIO_INT_LVL(t, x) (GPIO_REG(t, x) + 0x60)
#define GPIO_INT_CLR(t, x) (GPIO_REG(t, x) + 0x70)
#define GPIO_DBC_CNT(t, x) (GPIO_REG(t, x) + 0xF0)
#define GPIO_MSK_CNF(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x00)
#define GPIO_MSK_OE(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x10)
#define GPIO_MSK_OUT(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0X20)
#define GPIO_MSK_DBC_EN(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x30)
#define GPIO_MSK_INT_STA(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x40)
#define GPIO_MSK_INT_ENB(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x50)
#define GPIO_MSK_INT_LVL(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x60)
#define GPIO_INT_LVL_MASK 0x010101
#define GPIO_INT_LVL_EDGE_RISING 0x000101
#define GPIO_INT_LVL_EDGE_FALLING 0x000100
#define GPIO_INT_LVL_EDGE_BOTH 0x010100
#define GPIO_INT_LVL_LEVEL_HIGH 0x000001
#define GPIO_INT_LVL_LEVEL_LOW 0x000000
struct tegra_gpio_info;
struct tegra_gpio_bank {
unsigned int bank;
/*
* IRQ-core code uses raw locking, and thus, nested locking also
* should be raw in order not to trip spinlock debug warnings.
*/
raw_spinlock_t lvl_lock[4];
/* Lock for updating debounce count register */
spinlock_t dbc_lock[4];
#ifdef CONFIG_PM_SLEEP
u32 cnf[4];
u32 out[4];
u32 oe[4];
u32 int_enb[4];
u32 int_lvl[4];
u32 wake_enb[4];
u32 dbc_enb[4];
#endif
u32 dbc_cnt[4];
};
struct tegra_gpio_soc_config {
bool debounce_supported;
u32 bank_stride;
u32 upper_offset;
};
struct tegra_gpio_info {
struct device *dev;
void __iomem *regs;
struct tegra_gpio_bank *bank_info;
const struct tegra_gpio_soc_config *soc;
struct gpio_chip gc;
u32 bank_count;
unsigned int *irqs;
};
static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi,
u32 val, u32 reg)
{
writel_relaxed(val, tgi->regs + reg);
}
static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg)
{
return readl_relaxed(tgi->regs + reg);
}
static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port,
unsigned int bit)
{
return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7);
}
static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg,
unsigned int gpio, u32 value)
{
u32 val;
val = 0x100 << GPIO_BIT(gpio);
if (value)
val |= 1 << GPIO_BIT(gpio);
tegra_gpio_writel(tgi, val, reg);
}
static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio)
{
tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1);
}
static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio)
{
tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0);
}
static int tegra_gpio_request(struct gpio_chip *chip, unsigned int offset)
{
return pinctrl_gpio_request(chip->base + offset);
}
static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset)
{
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
pinctrl_gpio_free(chip->base + offset);
tegra_gpio_disable(tgi, offset);
}
static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset,
int value)
{
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value);
}
static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
unsigned int bval = BIT(GPIO_BIT(offset));
/* If gpio is in output mode then read from the out value */
if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval)
return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval);
return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval);
}
static int tegra_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
int ret;
tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0);
tegra_gpio_enable(tgi, offset);
ret = pinctrl_gpio_direction_input(chip->base + offset);
if (ret < 0)
dev_err(tgi->dev,
"Failed to set pinctrl input direction of GPIO %d: %d",
chip->base + offset, ret);
return ret;
}
static int tegra_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset,
int value)
{
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
int ret;
tegra_gpio_set(chip, offset, value);
tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1);
tegra_gpio_enable(tgi, offset);
ret = pinctrl_gpio_direction_output(chip->base + offset);
if (ret < 0)
dev_err(tgi->dev,
"Failed to set pinctrl output direction of GPIO %d: %d",
chip->base + offset, ret);
return ret;
}
static int tegra_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
u32 pin_mask = BIT(GPIO_BIT(offset));
u32 cnf, oe;
cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset));
if (!(cnf & pin_mask))
return -EINVAL;
oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset));
if (oe & pin_mask)
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
}
static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
unsigned int debounce)
{
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)];
unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000);
unsigned long flags;
unsigned int port;
if (!debounce_ms) {
tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset),
offset, 0);
return 0;
}
debounce_ms = min(debounce_ms, 255U);
port = GPIO_PORT(offset);
/* There is only one debounce count register per port and hence
* set the maximum of current and requested debounce time.
*/
spin_lock_irqsave(&bank->dbc_lock[port], flags);
if (bank->dbc_cnt[port] < debounce_ms) {
tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset));
bank->dbc_cnt[port] = debounce_ms;
}
spin_unlock_irqrestore(&bank->dbc_lock[port], flags);
tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1);
return 0;
}
static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
unsigned long config)
{
u32 debounce;
if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
return -ENOTSUPP;
debounce = pinconf_to_config_argument(config);
return tegra_gpio_set_debounce(chip, offset, debounce);
}
static void tegra_gpio_irq_ack(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
unsigned int gpio = d->hwirq;
tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio));
}
static void tegra_gpio_irq_mask(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
unsigned int gpio = d->hwirq;
tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0);
gpiochip_disable_irq(chip, gpio);
}
static void tegra_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
unsigned int gpio = d->hwirq;
gpiochip_enable_irq(chip, gpio);
tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
}
static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type;
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
struct tegra_gpio_bank *bank;
unsigned long flags;
int ret;
u32 val;
bank = &tgi->bank_info[GPIO_BANK(d->hwirq)];
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
lvl_type = GPIO_INT_LVL_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
lvl_type = GPIO_INT_LVL_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
lvl_type = GPIO_INT_LVL_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
lvl_type = GPIO_INT_LVL_LEVEL_HIGH;
break;
case IRQ_TYPE_LEVEL_LOW:
lvl_type = GPIO_INT_LVL_LEVEL_LOW;
break;
default:
return -EINVAL;
}
raw_spin_lock_irqsave(&bank->lvl_lock[port], flags);
val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio));
val |= lvl_type << GPIO_BIT(gpio);
tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio));
raw_spin_unlock_irqrestore(&bank->lvl_lock[port], flags);
tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0);
tegra_gpio_enable(tgi, gpio);
ret = gpiochip_lock_as_irq(&tgi->gc, gpio);
if (ret) {
dev_err(tgi->dev,
"unable to lock Tegra GPIO %u as IRQ\n", gpio);
tegra_gpio_disable(tgi, gpio);
return ret;
}
if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
irq_set_handler_locked(d, handle_level_irq);
else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
irq_set_handler_locked(d, handle_edge_irq);
if (d->parent_data)
ret = irq_chip_set_type_parent(d, type);
return ret;
}
static void tegra_gpio_irq_shutdown(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
unsigned int gpio = d->hwirq;
tegra_gpio_irq_mask(d);
gpiochip_unlock_as_irq(&tgi->gc, gpio);
}
static void tegra_gpio_irq_handler(struct irq_desc *desc)
{
struct tegra_gpio_info *tgi = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
struct irq_domain *domain = tgi->gc.irq.domain;
unsigned int irq = irq_desc_get_irq(desc);
struct tegra_gpio_bank *bank = NULL;
unsigned int port, pin, gpio, i;
bool unmasked = false;
unsigned long sta;
u32 lvl;
for (i = 0; i < tgi->bank_count; i++) {
if (tgi->irqs[i] == irq) {
bank = &tgi->bank_info[i];
break;
}
}
if (WARN_ON(bank == NULL))
return;
chained_irq_enter(chip, desc);
for (port = 0; port < 4; port++) {
gpio = tegra_gpio_compose(bank->bank, port, 0);
sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) &
tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio));
lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio));
for_each_set_bit(pin, &sta, 8) {
int ret;
tegra_gpio_writel(tgi, 1 << pin,
GPIO_INT_CLR(tgi, gpio));
/* if gpio is edge triggered, clear condition
* before executing the handler so that we don't
* miss edges
*/
if (!unmasked && lvl & (0x100 << pin)) {
unmasked = true;
chained_irq_exit(chip, desc);
}
ret = generic_handle_domain_irq(domain, gpio + pin);
WARN_RATELIMIT(ret, "hwirq = %d", gpio + pin);
}
}
if (!unmasked)
chained_irq_exit(chip, desc);
}
static int tegra_gpio_child_to_parent_hwirq(struct gpio_chip *chip,
unsigned int hwirq,
unsigned int type,
unsigned int *parent_hwirq,
unsigned int *parent_type)
{
*parent_hwirq = chip->irq.child_offset_to_irq(chip, hwirq);
*parent_type = type;
return 0;
}
static int tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec = &gfwspec->fwspec;
fwspec->fwnode = chip->irq.parent_domain->fwnode;
fwspec->param_count = 3;
fwspec->param[0] = 0;
fwspec->param[1] = parent_hwirq;
fwspec->param[2] = parent_type;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tegra_gpio_resume(struct device *dev)
{
struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
unsigned int b, p;
for (b = 0; b < tgi->bank_count; b++) {
struct tegra_gpio_bank *bank = &tgi->bank_info[b];
for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
unsigned int gpio = (b << 5) | (p << 3);
tegra_gpio_writel(tgi, bank->cnf[p],
GPIO_CNF(tgi, gpio));
if (tgi->soc->debounce_supported) {
tegra_gpio_writel(tgi, bank->dbc_cnt[p],
GPIO_DBC_CNT(tgi, gpio));
tegra_gpio_writel(tgi, bank->dbc_enb[p],
GPIO_MSK_DBC_EN(tgi, gpio));
}
tegra_gpio_writel(tgi, bank->out[p],
GPIO_OUT(tgi, gpio));
tegra_gpio_writel(tgi, bank->oe[p],
GPIO_OE(tgi, gpio));
tegra_gpio_writel(tgi, bank->int_lvl[p],
GPIO_INT_LVL(tgi, gpio));
tegra_gpio_writel(tgi, bank->int_enb[p],
GPIO_INT_ENB(tgi, gpio));
}
}
return 0;
}
static int tegra_gpio_suspend(struct device *dev)
{
struct tegra_gpio_info *tgi = dev_get_drvdata(dev);
unsigned int b, p;
for (b = 0; b < tgi->bank_count; b++) {
struct tegra_gpio_bank *bank = &tgi->bank_info[b];
for (p = 0; p < ARRAY_SIZE(bank->oe); p++) {
unsigned int gpio = (b << 5) | (p << 3);
bank->cnf[p] = tegra_gpio_readl(tgi,
GPIO_CNF(tgi, gpio));
bank->out[p] = tegra_gpio_readl(tgi,
GPIO_OUT(tgi, gpio));
bank->oe[p] = tegra_gpio_readl(tgi,
GPIO_OE(tgi, gpio));
if (tgi->soc->debounce_supported) {
bank->dbc_enb[p] = tegra_gpio_readl(tgi,
GPIO_MSK_DBC_EN(tgi, gpio));
bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) |
bank->dbc_enb[p];
}
bank->int_enb[p] = tegra_gpio_readl(tgi,
GPIO_INT_ENB(tgi, gpio));
bank->int_lvl[p] = tegra_gpio_readl(tgi,
GPIO_INT_LVL(tgi, gpio));
/* Enable gpio irq for wake up source */
tegra_gpio_writel(tgi, bank->wake_enb[p],
GPIO_INT_ENB(tgi, gpio));
}
}
return 0;
}
static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
struct tegra_gpio_bank *bank;
unsigned int gpio = d->hwirq;
u32 port, bit, mask;
int err;
bank = &tgi->bank_info[GPIO_BANK(d->hwirq)];
port = GPIO_PORT(gpio);
bit = GPIO_BIT(gpio);
mask = BIT(bit);
err = irq_set_irq_wake(tgi->irqs[bank->bank], enable);
if (err)
return err;
if (d->parent_data) {
err = irq_chip_set_wake_parent(d, enable);
if (err) {
irq_set_irq_wake(tgi->irqs[bank->bank], !enable);
return err;
}
}
if (enable)
bank->wake_enb[port] |= mask;
else
bank->wake_enb[port] &= ~mask;
return 0;
}
#endif
static int tegra_gpio_irq_set_affinity(struct irq_data *data,
const struct cpumask *dest,
bool force)
{
if (data->parent_data)
return irq_chip_set_affinity_parent(data, dest, force);
return -EINVAL;
}
static int tegra_gpio_irq_request_resources(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
tegra_gpio_enable(tgi, d->hwirq);
return gpiochip_reqres_irq(chip, d->hwirq);
}
static void tegra_gpio_irq_release_resources(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
gpiochip_relres_irq(chip, d->hwirq);
tegra_gpio_enable(tgi, d->hwirq);
}
static void tegra_gpio_irq_print_chip(struct irq_data *d, struct seq_file *s)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
seq_printf(s, dev_name(chip->parent));
}
static const struct irq_chip tegra_gpio_irq_chip = {
.irq_shutdown = tegra_gpio_irq_shutdown,
.irq_ack = tegra_gpio_irq_ack,
.irq_mask = tegra_gpio_irq_mask,
.irq_unmask = tegra_gpio_irq_unmask,
.irq_set_type = tegra_gpio_irq_set_type,
#ifdef CONFIG_PM_SLEEP
.irq_set_wake = tegra_gpio_irq_set_wake,
#endif
.irq_print_chip = tegra_gpio_irq_print_chip,
.irq_request_resources = tegra_gpio_irq_request_resources,
.irq_release_resources = tegra_gpio_irq_release_resources,
.flags = IRQCHIP_IMMUTABLE,
};
static const struct irq_chip tegra210_gpio_irq_chip = {
.irq_shutdown = tegra_gpio_irq_shutdown,
.irq_ack = tegra_gpio_irq_ack,
.irq_mask = tegra_gpio_irq_mask,
.irq_unmask = tegra_gpio_irq_unmask,
.irq_set_affinity = tegra_gpio_irq_set_affinity,
.irq_set_type = tegra_gpio_irq_set_type,
#ifdef CONFIG_PM_SLEEP
.irq_set_wake = tegra_gpio_irq_set_wake,
#endif
.irq_print_chip = tegra_gpio_irq_print_chip,
.irq_request_resources = tegra_gpio_irq_request_resources,
.irq_release_resources = tegra_gpio_irq_release_resources,
.flags = IRQCHIP_IMMUTABLE,
};
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
{
struct tegra_gpio_info *tgi = dev_get_drvdata(s->private);
unsigned int i, j;
for (i = 0; i < tgi->bank_count; i++) {
for (j = 0; j < 4; j++) {
unsigned int gpio = tegra_gpio_compose(i, j, 0);
seq_printf(s,
"%u:%u %02x %02x %02x %02x %02x %02x %06x\n",
i, j,
tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)),
tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)),
tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)),
tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)),
tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)),
tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)),
tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)));
}
}
return 0;
}
static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
{
debugfs_create_devm_seqfile(tgi->dev, "tegra_gpio", NULL,
tegra_dbg_gpio_show);
}
#else
static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi)
{
}
#endif
static const struct dev_pm_ops tegra_gpio_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
};
static const struct of_device_id tegra_pmc_of_match[] = {
{ .compatible = "nvidia,tegra210-pmc", },
{ /* sentinel */ },
};
static int tegra_gpio_probe(struct platform_device *pdev)
{
struct tegra_gpio_bank *bank;
struct tegra_gpio_info *tgi;
struct gpio_irq_chip *irq;
struct device_node *np;
unsigned int i, j;
int ret;
tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL);
if (!tgi)
return -ENODEV;
tgi->soc = of_device_get_match_data(&pdev->dev);
tgi->dev = &pdev->dev;
ret = platform_irq_count(pdev);
if (ret < 0)
return ret;
tgi->bank_count = ret;
if (!tgi->bank_count) {
dev_err(&pdev->dev, "Missing IRQ resource\n");
return -ENODEV;
}
tgi->gc.label = "tegra-gpio";
tgi->gc.request = tegra_gpio_request;
tgi->gc.free = tegra_gpio_free;
tgi->gc.direction_input = tegra_gpio_direction_input;
tgi->gc.get = tegra_gpio_get;
tgi->gc.direction_output = tegra_gpio_direction_output;
tgi->gc.set = tegra_gpio_set;
tgi->gc.get_direction = tegra_gpio_get_direction;
tgi->gc.base = 0;
tgi->gc.ngpio = tgi->bank_count * 32;
tgi->gc.parent = &pdev->dev;
platform_set_drvdata(pdev, tgi);
if (tgi->soc->debounce_supported)
tgi->gc.set_config = tegra_gpio_set_config;
tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count,
sizeof(*tgi->bank_info), GFP_KERNEL);
if (!tgi->bank_info)
return -ENOMEM;
tgi->irqs = devm_kcalloc(&pdev->dev, tgi->bank_count,
sizeof(*tgi->irqs), GFP_KERNEL);
if (!tgi->irqs)
return -ENOMEM;
for (i = 0; i < tgi->bank_count; i++) {
ret = platform_get_irq(pdev, i);
if (ret < 0)
return ret;
bank = &tgi->bank_info[i];
bank->bank = i;
tgi->irqs[i] = ret;
for (j = 0; j < 4; j++) {
raw_spin_lock_init(&bank->lvl_lock[j]);
spin_lock_init(&bank->dbc_lock[j]);
}
}
irq = &tgi->gc.irq;
irq->fwnode = of_node_to_fwnode(pdev->dev.of_node);
irq->child_to_parent_hwirq = tegra_gpio_child_to_parent_hwirq;
irq->populate_parent_alloc_arg = tegra_gpio_populate_parent_fwspec;
irq->handler = handle_simple_irq;
irq->default_type = IRQ_TYPE_NONE;
irq->parent_handler = tegra_gpio_irq_handler;
irq->parent_handler_data = tgi;
irq->num_parents = tgi->bank_count;
irq->parents = tgi->irqs;
np = of_find_matching_node(NULL, tegra_pmc_of_match);
if (np) {
irq->parent_domain = irq_find_host(np);
of_node_put(np);
if (!irq->parent_domain)
return -EPROBE_DEFER;
gpio_irq_chip_set_chip(irq, &tegra210_gpio_irq_chip);
} else {
gpio_irq_chip_set_chip(irq, &tegra_gpio_irq_chip);
}
tgi->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(tgi->regs))
return PTR_ERR(tgi->regs);
for (i = 0; i < tgi->bank_count; i++) {
for (j = 0; j < 4; j++) {
int gpio = tegra_gpio_compose(i, j, 0);
tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio));
}
}
ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi);
if (ret < 0)
return ret;
tegra_gpio_debuginit(tgi);
return 0;
}
static const struct tegra_gpio_soc_config tegra20_gpio_config = {
.bank_stride = 0x80,
.upper_offset = 0x800,
};
static const struct tegra_gpio_soc_config tegra30_gpio_config = {
.bank_stride = 0x100,
.upper_offset = 0x80,
};
static const struct tegra_gpio_soc_config tegra210_gpio_config = {
.debounce_supported = true,
.bank_stride = 0x100,
.upper_offset = 0x80,
};
static const struct of_device_id tegra_gpio_of_match[] = {
{ .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config },
{ .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
{ .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_gpio_of_match);
static struct platform_driver tegra_gpio_driver = {
.driver = {
.name = "tegra-gpio",
.pm = &tegra_gpio_pm_ops,
.of_match_table = tegra_gpio_of_match,
},
.probe = tegra_gpio_probe,
};
module_platform_driver(tegra_gpio_driver);
MODULE_DESCRIPTION("NVIDIA Tegra GPIO controller driver");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_AUTHOR("Erik Gilling <konkers@google.com>");
MODULE_LICENSE("GPL v2");