linux/drivers/gpio/gpio-tegra.c
Dmitry Osipenko 94de03ccc9 gpio: tegra: Fix irq_set_affinity
The irq_set_affinity callback should not be set if parent IRQ domain
doesn't present because gpio-tegra driver callback fails in this case,
causing a noisy error messages on system suspend:

 Disabling non-boot CPUs ...
 IRQ 26: no longer affine to CPU1
 IRQ128: set affinity failed(-22).
 IRQ130: set affinity failed(-22).
 IRQ131: set affinity failed(-22).
 IRQ 27: no longer affine to CPU2
 IRQ128: set affinity failed(-22).
 IRQ130: set affinity failed(-22).
 IRQ131: set affinity failed(-22).
 IRQ 28: no longer affine to CPU3
 IRQ128: set affinity failed(-22).
 IRQ130: set affinity failed(-22).
 IRQ131: set affinity failed(-22).
 Entering suspend state LP1

Hence just don't specify the irq_set_affinity callback if parent PMC
IRQ domain is missing. Tegra isn't capable of setting affinity per GPIO,
affinity could be set only per GPIO bank, thus there is nothing to do
for gpio-tegra in regards to CPU affinity without the parent IRQ domain.

Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30
Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30
Tested-by: Dmitry Osipenko <digetx@gmail.com> # A500 T20 and Nexus7 T30
Fixes: efcdca286eef ("gpio: tegra: Convert to gpio_irq_chip")
Reported-by: Matt Merhar <mattmerhar@protonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2021-02-15 11:43:30 +01:00

824 lines
21 KiB
C

// 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_device.h>
#include <linux/platform_device.h>
#include <linux/module.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;
struct irq_chip ic;
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);
}
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;
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) {
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);
}
irq = irq_find_mapping(domain, gpio + pin);
if (WARN_ON(irq == 0))
continue;
generic_handle_irq(irq);
}
}
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 void *tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip,
unsigned int parent_hwirq,
unsigned int parent_type)
{
struct irq_fwspec *fwspec;
fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL);
if (!fwspec)
return NULL;
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 fwspec;
}
#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);
}
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.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;
tgi->gc.of_node = pdev->dev.of_node;
tgi->ic.name = "GPIO";
tgi->ic.irq_ack = tegra_gpio_irq_ack;
tgi->ic.irq_mask = tegra_gpio_irq_mask;
tgi->ic.irq_unmask = tegra_gpio_irq_unmask;
tgi->ic.irq_set_type = tegra_gpio_irq_set_type;
tgi->ic.irq_shutdown = tegra_gpio_irq_shutdown;
#ifdef CONFIG_PM_SLEEP
tgi->ic.irq_set_wake = tegra_gpio_irq_set_wake;
#endif
tgi->ic.irq_request_resources = tegra_gpio_irq_request_resources;
tgi->ic.irq_release_resources = tegra_gpio_irq_release_resources;
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->chip = &tgi->ic;
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;
tgi->ic.irq_set_affinity = tegra_gpio_irq_set_affinity;
}
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");