blob: 74b7c91c3d1aeefe8596cfa9da7e4b4d8681e8ba [file] [log] [blame]
/*
* Copyright (C) 2015-2017 Broadcom
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/bitops.h>
#include <linux/gpio/driver.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/interrupt.h>
enum gio_reg_index {
GIO_REG_ODEN = 0,
GIO_REG_DATA,
GIO_REG_IODIR,
GIO_REG_EC,
GIO_REG_EI,
GIO_REG_MASK,
GIO_REG_LEVEL,
GIO_REG_STAT,
NUMBER_OF_GIO_REGISTERS
};
#define GIO_BANK_SIZE (NUMBER_OF_GIO_REGISTERS * sizeof(u32))
#define GIO_BANK_OFF(bank, off) (((bank) * GIO_BANK_SIZE) + (off * sizeof(u32)))
#define GIO_ODEN(bank) GIO_BANK_OFF(bank, GIO_REG_ODEN)
#define GIO_DATA(bank) GIO_BANK_OFF(bank, GIO_REG_DATA)
#define GIO_IODIR(bank) GIO_BANK_OFF(bank, GIO_REG_IODIR)
#define GIO_EC(bank) GIO_BANK_OFF(bank, GIO_REG_EC)
#define GIO_EI(bank) GIO_BANK_OFF(bank, GIO_REG_EI)
#define GIO_MASK(bank) GIO_BANK_OFF(bank, GIO_REG_MASK)
#define GIO_LEVEL(bank) GIO_BANK_OFF(bank, GIO_REG_LEVEL)
#define GIO_STAT(bank) GIO_BANK_OFF(bank, GIO_REG_STAT)
struct brcmstb_gpio_bank {
struct list_head node;
int id;
struct gpio_chip gc;
struct brcmstb_gpio_priv *parent_priv;
u32 width;
u32 wake_active;
u32 saved_regs[GIO_REG_STAT]; /* Don't save and restore GIO_REG_STAT */
};
struct brcmstb_gpio_priv {
struct list_head bank_list;
void __iomem *reg_base;
struct platform_device *pdev;
struct irq_domain *irq_domain;
struct irq_chip irq_chip;
int parent_irq;
int gpio_base;
int num_gpios;
int parent_wake_irq;
};
#define MAX_GPIO_PER_BANK 32
#define GPIO_BANK(gpio) ((gpio) >> 5)
/* assumes MAX_GPIO_PER_BANK is a multiple of 2 */
#define GPIO_BIT(gpio) ((gpio) & (MAX_GPIO_PER_BANK - 1))
static inline struct brcmstb_gpio_priv *
brcmstb_gpio_gc_to_priv(struct gpio_chip *gc)
{
struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
return bank->parent_priv;
}
static unsigned long
__brcmstb_gpio_get_active_irqs(struct brcmstb_gpio_bank *bank)
{
void __iomem *reg_base = bank->parent_priv->reg_base;
return bank->gc.read_reg(reg_base + GIO_STAT(bank->id)) &
bank->gc.read_reg(reg_base + GIO_MASK(bank->id));
}
static unsigned long
brcmstb_gpio_get_active_irqs(struct brcmstb_gpio_bank *bank)
{
unsigned long status;
unsigned long flags;
spin_lock_irqsave(&bank->gc.bgpio_lock, flags);
status = __brcmstb_gpio_get_active_irqs(bank);
spin_unlock_irqrestore(&bank->gc.bgpio_lock, flags);
return status;
}
static int brcmstb_gpio_hwirq_to_offset(irq_hw_number_t hwirq,
struct brcmstb_gpio_bank *bank)
{
return hwirq - (bank->gc.base - bank->parent_priv->gpio_base);
}
static void brcmstb_gpio_set_imask(struct brcmstb_gpio_bank *bank,
unsigned int hwirq, bool enable)
{
struct gpio_chip *gc = &bank->gc;
struct brcmstb_gpio_priv *priv = bank->parent_priv;
u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(hwirq, bank));
u32 imask;
unsigned long flags;
spin_lock_irqsave(&gc->bgpio_lock, flags);
imask = gc->read_reg(priv->reg_base + GIO_MASK(bank->id));
if (enable)
imask |= mask;
else
imask &= ~mask;
gc->write_reg(priv->reg_base + GIO_MASK(bank->id), imask);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
static int brcmstb_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
/* gc_offset is relative to this gpio_chip; want real offset */
int hwirq = offset + (gc->base - priv->gpio_base);
if (hwirq >= priv->num_gpios)
return -ENXIO;
return irq_create_mapping(priv->irq_domain, hwirq);
}
/* -------------------- IRQ chip functions -------------------- */
static void brcmstb_gpio_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
brcmstb_gpio_set_imask(bank, d->hwirq, false);
}
static void brcmstb_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
brcmstb_gpio_set_imask(bank, d->hwirq, true);
}
static void brcmstb_gpio_irq_ack(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
struct brcmstb_gpio_priv *priv = bank->parent_priv;
u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(d->hwirq, bank));
gc->write_reg(priv->reg_base + GIO_STAT(bank->id), mask);
}
static int brcmstb_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
struct brcmstb_gpio_priv *priv = bank->parent_priv;
u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(d->hwirq, bank));
u32 edge_insensitive, iedge_insensitive;
u32 edge_config, iedge_config;
u32 level, ilevel;
unsigned long flags;
switch (type) {
case IRQ_TYPE_LEVEL_LOW:
level = mask;
edge_config = 0;
edge_insensitive = 0;
break;
case IRQ_TYPE_LEVEL_HIGH:
level = mask;
edge_config = mask;
edge_insensitive = 0;
break;
case IRQ_TYPE_EDGE_FALLING:
level = 0;
edge_config = 0;
edge_insensitive = 0;
break;
case IRQ_TYPE_EDGE_RISING:
level = 0;
edge_config = mask;
edge_insensitive = 0;
break;
case IRQ_TYPE_EDGE_BOTH:
level = 0;
edge_config = 0; /* don't care, but want known value */
edge_insensitive = mask;
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&bank->gc.bgpio_lock, flags);
iedge_config = bank->gc.read_reg(priv->reg_base +
GIO_EC(bank->id)) & ~mask;
iedge_insensitive = bank->gc.read_reg(priv->reg_base +
GIO_EI(bank->id)) & ~mask;
ilevel = bank->gc.read_reg(priv->reg_base +
GIO_LEVEL(bank->id)) & ~mask;
bank->gc.write_reg(priv->reg_base + GIO_EC(bank->id),
iedge_config | edge_config);
bank->gc.write_reg(priv->reg_base + GIO_EI(bank->id),
iedge_insensitive | edge_insensitive);
bank->gc.write_reg(priv->reg_base + GIO_LEVEL(bank->id),
ilevel | level);
spin_unlock_irqrestore(&bank->gc.bgpio_lock, flags);
return 0;
}
static int brcmstb_gpio_priv_set_wake(struct brcmstb_gpio_priv *priv,
unsigned int enable)
{
int ret = 0;
if (enable)
ret = enable_irq_wake(priv->parent_wake_irq);
else
ret = disable_irq_wake(priv->parent_wake_irq);
if (ret)
dev_err(&priv->pdev->dev, "failed to %s wake-up interrupt\n",
enable ? "enable" : "disable");
return ret;
}
static int brcmstb_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
struct brcmstb_gpio_priv *priv = bank->parent_priv;
u32 mask = BIT(brcmstb_gpio_hwirq_to_offset(d->hwirq, bank));
/*
* Do not do anything specific for now, suspend/resume callbacks will
* configure the interrupt mask appropriately
*/
if (enable)
bank->wake_active |= mask;
else
bank->wake_active &= ~mask;
return brcmstb_gpio_priv_set_wake(priv, enable);
}
static irqreturn_t brcmstb_gpio_wake_irq_handler(int irq, void *data)
{
struct brcmstb_gpio_priv *priv = data;
if (!priv || irq != priv->parent_wake_irq)
return IRQ_NONE;
/* Nothing to do */
return IRQ_HANDLED;
}
static void brcmstb_gpio_irq_bank_handler(struct brcmstb_gpio_bank *bank)
{
struct brcmstb_gpio_priv *priv = bank->parent_priv;
struct irq_domain *domain = priv->irq_domain;
int hwbase = bank->gc.base - priv->gpio_base;
unsigned long status;
while ((status = brcmstb_gpio_get_active_irqs(bank))) {
unsigned int offset;
for_each_set_bit(offset, &status, 32) {
if (offset >= bank->width)
dev_warn(&priv->pdev->dev,
"IRQ for invalid GPIO (bank=%d, offset=%d)\n",
bank->id, offset);
generic_handle_domain_irq(domain, hwbase + offset);
}
}
}
/* Each UPG GIO block has one IRQ for all banks */
static void brcmstb_gpio_irq_handler(struct irq_desc *desc)
{
struct brcmstb_gpio_priv *priv = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
struct brcmstb_gpio_bank *bank;
/* Interrupts weren't properly cleared during probe */
BUG_ON(!priv || !chip);
chained_irq_enter(chip, desc);
list_for_each_entry(bank, &priv->bank_list, node)
brcmstb_gpio_irq_bank_handler(bank);
chained_irq_exit(chip, desc);
}
static struct brcmstb_gpio_bank *brcmstb_gpio_hwirq_to_bank(
struct brcmstb_gpio_priv *priv, irq_hw_number_t hwirq)
{
struct brcmstb_gpio_bank *bank;
int i = 0;
/* banks are in descending order */
list_for_each_entry_reverse(bank, &priv->bank_list, node) {
i += bank->gc.ngpio;
if (hwirq < i)
return bank;
}
return NULL;
}
/*
* This lock class tells lockdep that GPIO irqs are in a different
* category than their parents, so it won't report false recursion.
*/
static struct lock_class_key brcmstb_gpio_irq_lock_class;
static struct lock_class_key brcmstb_gpio_irq_request_class;
static int brcmstb_gpio_irq_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
struct brcmstb_gpio_priv *priv = d->host_data;
struct brcmstb_gpio_bank *bank =
brcmstb_gpio_hwirq_to_bank(priv, hwirq);
struct platform_device *pdev = priv->pdev;
int ret;
if (!bank)
return -EINVAL;
dev_dbg(&pdev->dev, "Mapping irq %d for gpio line %d (bank %d)\n",
irq, (int)hwirq, bank->id);
ret = irq_set_chip_data(irq, &bank->gc);
if (ret < 0)
return ret;
irq_set_lockdep_class(irq, &brcmstb_gpio_irq_lock_class,
&brcmstb_gpio_irq_request_class);
irq_set_chip_and_handler(irq, &priv->irq_chip, handle_level_irq);
irq_set_noprobe(irq);
return 0;
}
static void brcmstb_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
{
irq_set_chip_and_handler(irq, NULL, NULL);
irq_set_chip_data(irq, NULL);
}
static const struct irq_domain_ops brcmstb_gpio_irq_domain_ops = {
.map = brcmstb_gpio_irq_map,
.unmap = brcmstb_gpio_irq_unmap,
.xlate = irq_domain_xlate_twocell,
};
/* Make sure that the number of banks matches up between properties */
static int brcmstb_gpio_sanity_check_banks(struct device *dev,
struct device_node *np, struct resource *res)
{
int res_num_banks = resource_size(res) / GIO_BANK_SIZE;
int num_banks =
of_property_count_u32_elems(np, "brcm,gpio-bank-widths");
if (res_num_banks != num_banks) {
dev_err(dev, "Mismatch in banks: res had %d, bank-widths had %d\n",
res_num_banks, num_banks);
return -EINVAL;
} else {
return 0;
}
}
static int brcmstb_gpio_remove(struct platform_device *pdev)
{
struct brcmstb_gpio_priv *priv = platform_get_drvdata(pdev);
struct brcmstb_gpio_bank *bank;
int offset, ret = 0, virq;
if (!priv) {
dev_err(&pdev->dev, "called %s without drvdata!\n", __func__);
return -EFAULT;
}
if (priv->parent_irq > 0)
irq_set_chained_handler_and_data(priv->parent_irq, NULL, NULL);
/* Remove all IRQ mappings and delete the domain */
if (priv->irq_domain) {
for (offset = 0; offset < priv->num_gpios; offset++) {
virq = irq_find_mapping(priv->irq_domain, offset);
irq_dispose_mapping(virq);
}
irq_domain_remove(priv->irq_domain);
}
/*
* You can lose return values below, but we report all errors, and it's
* more important to actually perform all of the steps.
*/
list_for_each_entry(bank, &priv->bank_list, node)
gpiochip_remove(&bank->gc);
return ret;
}
static int brcmstb_gpio_of_xlate(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec, u32 *flags)
{
struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc);
struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc);
int offset;
if (gc->of_gpio_n_cells != 2) {
WARN_ON(1);
return -EINVAL;
}
if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
return -EINVAL;
offset = gpiospec->args[0] - (gc->base - priv->gpio_base);
if (offset >= gc->ngpio || offset < 0)
return -EINVAL;
if (unlikely(offset >= bank->width)) {
dev_warn_ratelimited(&priv->pdev->dev,
"Received request for invalid GPIO offset %d\n",
gpiospec->args[0]);
}
if (flags)
*flags = gpiospec->args[1];
return offset;
}
/* priv->parent_irq and priv->num_gpios must be set before calling */
static int brcmstb_gpio_irq_setup(struct platform_device *pdev,
struct brcmstb_gpio_priv *priv)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
int err;
priv->irq_domain =
irq_domain_add_linear(np, priv->num_gpios,
&brcmstb_gpio_irq_domain_ops,
priv);
if (!priv->irq_domain) {
dev_err(dev, "Couldn't allocate IRQ domain\n");
return -ENXIO;
}
if (of_property_read_bool(np, "wakeup-source")) {
priv->parent_wake_irq = platform_get_irq(pdev, 1);
if (priv->parent_wake_irq < 0) {
priv->parent_wake_irq = 0;
dev_warn(dev,
"Couldn't get wake IRQ - GPIOs will not be able to wake from sleep");
} else {
/*
* Set wakeup capability so we can process boot-time
* "wakeups" (e.g., from S5 cold boot)
*/
device_set_wakeup_capable(dev, true);
device_wakeup_enable(dev);
err = devm_request_irq(dev, priv->parent_wake_irq,
brcmstb_gpio_wake_irq_handler,
IRQF_SHARED,
"brcmstb-gpio-wake", priv);
if (err < 0) {
dev_err(dev, "Couldn't request wake IRQ");
goto out_free_domain;
}
}
}
priv->irq_chip.name = dev_name(dev);
priv->irq_chip.irq_disable = brcmstb_gpio_irq_mask;
priv->irq_chip.irq_mask = brcmstb_gpio_irq_mask;
priv->irq_chip.irq_unmask = brcmstb_gpio_irq_unmask;
priv->irq_chip.irq_ack = brcmstb_gpio_irq_ack;
priv->irq_chip.irq_set_type = brcmstb_gpio_irq_set_type;
if (priv->parent_wake_irq)
priv->irq_chip.irq_set_wake = brcmstb_gpio_irq_set_wake;
irq_set_chained_handler_and_data(priv->parent_irq,
brcmstb_gpio_irq_handler, priv);
irq_set_status_flags(priv->parent_irq, IRQ_DISABLE_UNLAZY);
return 0;
out_free_domain:
irq_domain_remove(priv->irq_domain);
return err;
}
static void brcmstb_gpio_bank_save(struct brcmstb_gpio_priv *priv,
struct brcmstb_gpio_bank *bank)
{
struct gpio_chip *gc = &bank->gc;
unsigned int i;
for (i = 0; i < GIO_REG_STAT; i++)
bank->saved_regs[i] = gc->read_reg(priv->reg_base +
GIO_BANK_OFF(bank->id, i));
}
static void brcmstb_gpio_quiesce(struct device *dev, bool save)
{
struct brcmstb_gpio_priv *priv = dev_get_drvdata(dev);
struct brcmstb_gpio_bank *bank;
struct gpio_chip *gc;
u32 imask;
/* disable non-wake interrupt */
if (priv->parent_irq >= 0)
disable_irq(priv->parent_irq);
list_for_each_entry(bank, &priv->bank_list, node) {
gc = &bank->gc;
if (save)
brcmstb_gpio_bank_save(priv, bank);
/* Unmask GPIOs which have been flagged as wake-up sources */
if (priv->parent_wake_irq)
imask = bank->wake_active;
else
imask = 0;
gc->write_reg(priv->reg_base + GIO_MASK(bank->id),
imask);
}
}
static void brcmstb_gpio_shutdown(struct platform_device *pdev)
{
/* Enable GPIO for S5 cold boot */
brcmstb_gpio_quiesce(&pdev->dev, false);
}
#ifdef CONFIG_PM_SLEEP
static void brcmstb_gpio_bank_restore(struct brcmstb_gpio_priv *priv,
struct brcmstb_gpio_bank *bank)
{
struct gpio_chip *gc = &bank->gc;
unsigned int i;
for (i = 0; i < GIO_REG_STAT; i++)
gc->write_reg(priv->reg_base + GIO_BANK_OFF(bank->id, i),
bank->saved_regs[i]);
}
static int brcmstb_gpio_suspend(struct device *dev)
{
brcmstb_gpio_quiesce(dev, true);
return 0;
}
static int brcmstb_gpio_resume(struct device *dev)
{
struct brcmstb_gpio_priv *priv = dev_get_drvdata(dev);
struct brcmstb_gpio_bank *bank;
bool need_wakeup_event = false;
list_for_each_entry(bank, &priv->bank_list, node) {
need_wakeup_event |= !!__brcmstb_gpio_get_active_irqs(bank);
brcmstb_gpio_bank_restore(priv, bank);
}
if (priv->parent_wake_irq && need_wakeup_event)
pm_wakeup_event(dev, 0);
/* enable non-wake interrupt */
if (priv->parent_irq >= 0)
enable_irq(priv->parent_irq);
return 0;
}
#else
#define brcmstb_gpio_suspend NULL
#define brcmstb_gpio_resume NULL
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops brcmstb_gpio_pm_ops = {
.suspend_noirq = brcmstb_gpio_suspend,
.resume_noirq = brcmstb_gpio_resume,
};
static void brcmstb_gpio_set_names(struct device *dev,
struct brcmstb_gpio_bank *bank)
{
struct device_node *np = dev->of_node;
const char **names;
int nstrings, base;
unsigned int i;
base = bank->id * MAX_GPIO_PER_BANK;
nstrings = of_property_count_strings(np, "gpio-line-names");
if (nstrings <= base)
/* Line names not present */
return;
names = devm_kcalloc(dev, MAX_GPIO_PER_BANK, sizeof(*names),
GFP_KERNEL);
if (!names)
return;
/*
* Make sure to not index beyond the end of the number of descriptors
* of the GPIO device.
*/
for (i = 0; i < bank->width; i++) {
const char *name;
int ret;
ret = of_property_read_string_index(np, "gpio-line-names",
base + i, &name);
if (ret) {
if (ret != -ENODATA)
dev_err(dev, "unable to name line %d: %d\n",
base + i, ret);
break;
}
if (*name)
names[i] = name;
}
bank->gc.names = names;
}
static int brcmstb_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
void __iomem *reg_base;
struct brcmstb_gpio_priv *priv;
struct resource *res;
struct property *prop;
const __be32 *p;
u32 bank_width;
int num_banks = 0;
int err;
static int gpio_base;
unsigned long flags = 0;
bool need_wakeup_event = false;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
INIT_LIST_HEAD(&priv->bank_list);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg_base = devm_ioremap_resource(dev, res);
if (IS_ERR(reg_base))
return PTR_ERR(reg_base);
priv->gpio_base = gpio_base;
priv->reg_base = reg_base;
priv->pdev = pdev;
if (of_property_read_bool(np, "interrupt-controller")) {
priv->parent_irq = platform_get_irq(pdev, 0);
if (priv->parent_irq <= 0)
return -ENOENT;
} else {
priv->parent_irq = -ENOENT;
}
if (brcmstb_gpio_sanity_check_banks(dev, np, res))
return -EINVAL;
/*
* MIPS endianness is configured by boot strap, which also reverses all
* bus endianness (i.e., big-endian CPU + big endian bus ==> native
* endian I/O).
*
* Other architectures (e.g., ARM) either do not support big endian, or
* else leave I/O in little endian mode.
*/
#if defined(CONFIG_MIPS) && defined(__BIG_ENDIAN)
flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
#endif
of_property_for_each_u32(np, "brcm,gpio-bank-widths", prop, p,
bank_width) {
struct brcmstb_gpio_bank *bank;
struct gpio_chip *gc;
/*
* If bank_width is 0, then there is an empty bank in the
* register block. Special handling for this case.
*/
if (bank_width == 0) {
dev_dbg(dev, "Width 0 found: Empty bank @ %d\n",
num_banks);
num_banks++;
gpio_base += MAX_GPIO_PER_BANK;
continue;
}
bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
if (!bank) {
err = -ENOMEM;
goto fail;
}
bank->parent_priv = priv;
bank->id = num_banks;
if (bank_width <= 0 || bank_width > MAX_GPIO_PER_BANK) {
dev_err(dev, "Invalid bank width %d\n", bank_width);
err = -EINVAL;
goto fail;
} else {
bank->width = bank_width;
}
/*
* Regs are 4 bytes wide, have data reg, no set/clear regs,
* and direction bits have 0 = output and 1 = input
*/
gc = &bank->gc;
err = bgpio_init(gc, dev, 4,
reg_base + GIO_DATA(bank->id),
NULL, NULL, NULL,
reg_base + GIO_IODIR(bank->id), flags);
if (err) {
dev_err(dev, "bgpio_init() failed\n");
goto fail;
}
gc->of_node = np;
gc->owner = THIS_MODULE;
gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", dev->of_node);
if (!gc->label) {
err = -ENOMEM;
goto fail;
}
gc->base = gpio_base;
gc->of_gpio_n_cells = 2;
gc->of_xlate = brcmstb_gpio_of_xlate;
/* not all ngpio lines are valid, will use bank width later */
gc->ngpio = MAX_GPIO_PER_BANK;
if (priv->parent_irq > 0)
gc->to_irq = brcmstb_gpio_to_irq;
/*
* Mask all interrupts by default, since wakeup interrupts may
* be retained from S5 cold boot
*/
need_wakeup_event |= !!__brcmstb_gpio_get_active_irqs(bank);
gc->write_reg(reg_base + GIO_MASK(bank->id), 0);
brcmstb_gpio_set_names(dev, bank);
err = gpiochip_add_data(gc, bank);
if (err) {
dev_err(dev, "Could not add gpiochip for bank %d\n",
bank->id);
goto fail;
}
gpio_base += gc->ngpio;
dev_dbg(dev, "bank=%d, base=%d, ngpio=%d, width=%d\n", bank->id,
gc->base, gc->ngpio, bank->width);
/* Everything looks good, so add bank to list */
list_add(&bank->node, &priv->bank_list);
num_banks++;
}
priv->num_gpios = gpio_base - priv->gpio_base;
if (priv->parent_irq > 0) {
err = brcmstb_gpio_irq_setup(pdev, priv);
if (err)
goto fail;
}
if (priv->parent_wake_irq && need_wakeup_event)
pm_wakeup_event(dev, 0);
return 0;
fail:
(void) brcmstb_gpio_remove(pdev);
return err;
}
static const struct of_device_id brcmstb_gpio_of_match[] = {
{ .compatible = "brcm,brcmstb-gpio" },
{},
};
MODULE_DEVICE_TABLE(of, brcmstb_gpio_of_match);
static struct platform_driver brcmstb_gpio_driver = {
.driver = {
.name = "brcmstb-gpio",
.of_match_table = brcmstb_gpio_of_match,
.pm = &brcmstb_gpio_pm_ops,
},
.probe = brcmstb_gpio_probe,
.remove = brcmstb_gpio_remove,
.shutdown = brcmstb_gpio_shutdown,
};
module_platform_driver(brcmstb_gpio_driver);
MODULE_AUTHOR("Gregory Fong");
MODULE_DESCRIPTION("Driver for Broadcom BRCMSTB SoC UPG GPIO");
MODULE_LICENSE("GPL v2");