linux/drivers/gpio/gpio-dwapb.c
Serge Semin feeaefd378 gpio: dwapb: Use resource managed GPIO-chip add data method
Since the resource managed version of gpiochip_add_data() will handle the
GPIO-chip data automated cleanup we can freely remove the DW APB GPIO
driver code responsible for that. After doing so the DW APB GPIO driver
removal callback can be also fully discarded since there is nothing left
to be done for it. All the cleanups are now performed by means of the
device managed framework.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20200730152808.2955-11-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-08-27 10:32:58 +02:00

837 lines
20 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2011 Jamie Iles
*
* All enquiries to support@picochip.com
*/
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/reset.h>
#include <linux/spinlock.h>
#include <linux/platform_data/gpio-dwapb.h>
#include <linux/slab.h>
#include "gpiolib.h"
#include "gpiolib-acpi.h"
#define GPIO_SWPORTA_DR 0x00
#define GPIO_SWPORTA_DDR 0x04
#define GPIO_SWPORTB_DR 0x0c
#define GPIO_SWPORTB_DDR 0x10
#define GPIO_SWPORTC_DR 0x18
#define GPIO_SWPORTC_DDR 0x1c
#define GPIO_SWPORTD_DR 0x24
#define GPIO_SWPORTD_DDR 0x28
#define GPIO_INTEN 0x30
#define GPIO_INTMASK 0x34
#define GPIO_INTTYPE_LEVEL 0x38
#define GPIO_INT_POLARITY 0x3c
#define GPIO_INTSTATUS 0x40
#define GPIO_PORTA_DEBOUNCE 0x48
#define GPIO_PORTA_EOI 0x4c
#define GPIO_EXT_PORTA 0x50
#define GPIO_EXT_PORTB 0x54
#define GPIO_EXT_PORTC 0x58
#define GPIO_EXT_PORTD 0x5c
#define DWAPB_DRIVER_NAME "gpio-dwapb"
#define DWAPB_MAX_PORTS 4
#define GPIO_EXT_PORT_STRIDE 0x04 /* register stride 32 bits */
#define GPIO_SWPORT_DR_STRIDE 0x0c /* register stride 3*32 bits */
#define GPIO_SWPORT_DDR_STRIDE 0x0c /* register stride 3*32 bits */
#define GPIO_REG_OFFSET_V2 1
#define GPIO_INTMASK_V2 0x44
#define GPIO_INTTYPE_LEVEL_V2 0x34
#define GPIO_INT_POLARITY_V2 0x38
#define GPIO_INTSTATUS_V2 0x3c
#define GPIO_PORTA_EOI_V2 0x40
#define DWAPB_NR_CLOCKS 2
struct dwapb_gpio;
#ifdef CONFIG_PM_SLEEP
/* Store GPIO context across system-wide suspend/resume transitions */
struct dwapb_context {
u32 data;
u32 dir;
u32 ext;
u32 int_en;
u32 int_mask;
u32 int_type;
u32 int_pol;
u32 int_deb;
u32 wake_en;
};
#endif
struct dwapb_gpio_port_irqchip {
struct irq_chip irqchip;
unsigned int nr_irqs;
unsigned int irq[DWAPB_MAX_GPIOS];
};
struct dwapb_gpio_port {
struct gpio_chip gc;
struct dwapb_gpio_port_irqchip *pirq;
struct dwapb_gpio *gpio;
#ifdef CONFIG_PM_SLEEP
struct dwapb_context *ctx;
#endif
unsigned int idx;
};
#define to_dwapb_gpio(_gc) \
(container_of(_gc, struct dwapb_gpio_port, gc)->gpio)
struct dwapb_gpio {
struct device *dev;
void __iomem *regs;
struct dwapb_gpio_port *ports;
unsigned int nr_ports;
unsigned int flags;
struct reset_control *rst;
struct clk_bulk_data clks[DWAPB_NR_CLOCKS];
};
static inline u32 gpio_reg_v2_convert(unsigned int offset)
{
switch (offset) {
case GPIO_INTMASK:
return GPIO_INTMASK_V2;
case GPIO_INTTYPE_LEVEL:
return GPIO_INTTYPE_LEVEL_V2;
case GPIO_INT_POLARITY:
return GPIO_INT_POLARITY_V2;
case GPIO_INTSTATUS:
return GPIO_INTSTATUS_V2;
case GPIO_PORTA_EOI:
return GPIO_PORTA_EOI_V2;
}
return offset;
}
static inline u32 gpio_reg_convert(struct dwapb_gpio *gpio, unsigned int offset)
{
if (gpio->flags & GPIO_REG_OFFSET_V2)
return gpio_reg_v2_convert(offset);
return offset;
}
static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset)
{
struct gpio_chip *gc = &gpio->ports[0].gc;
void __iomem *reg_base = gpio->regs;
return gc->read_reg(reg_base + gpio_reg_convert(gpio, offset));
}
static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset,
u32 val)
{
struct gpio_chip *gc = &gpio->ports[0].gc;
void __iomem *reg_base = gpio->regs;
gc->write_reg(reg_base + gpio_reg_convert(gpio, offset), val);
}
static struct dwapb_gpio_port *dwapb_offs_to_port(struct dwapb_gpio *gpio, unsigned int offs)
{
struct dwapb_gpio_port *port;
int i;
for (i = 0; i < gpio->nr_ports; i++) {
port = &gpio->ports[i];
if (port->idx == offs / DWAPB_MAX_GPIOS)
return port;
}
return NULL;
}
static void dwapb_toggle_trigger(struct dwapb_gpio *gpio, unsigned int offs)
{
struct dwapb_gpio_port *port = dwapb_offs_to_port(gpio, offs);
struct gpio_chip *gc;
u32 pol;
int val;
if (!port)
return;
gc = &port->gc;
pol = dwapb_read(gpio, GPIO_INT_POLARITY);
/* Just read the current value right out of the data register */
val = gc->get(gc, offs % DWAPB_MAX_GPIOS);
if (val)
pol &= ~BIT(offs);
else
pol |= BIT(offs);
dwapb_write(gpio, GPIO_INT_POLARITY, pol);
}
static u32 dwapb_do_irq(struct dwapb_gpio *gpio)
{
struct gpio_chip *gc = &gpio->ports[0].gc;
unsigned long irq_status;
irq_hw_number_t hwirq;
irq_status = dwapb_read(gpio, GPIO_INTSTATUS);
for_each_set_bit(hwirq, &irq_status, DWAPB_MAX_GPIOS) {
int gpio_irq = irq_find_mapping(gc->irq.domain, hwirq);
u32 irq_type = irq_get_trigger_type(gpio_irq);
generic_handle_irq(gpio_irq);
if ((irq_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH)
dwapb_toggle_trigger(gpio, hwirq);
}
return irq_status;
}
static void dwapb_irq_handler(struct irq_desc *desc)
{
struct dwapb_gpio *gpio = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
chained_irq_enter(chip, desc);
dwapb_do_irq(gpio);
chained_irq_exit(chip, desc);
}
static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id)
{
return IRQ_RETVAL(dwapb_do_irq(dev_id));
}
static void dwapb_irq_ack(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
u32 val = BIT(irqd_to_hwirq(d));
unsigned long flags;
spin_lock_irqsave(&gc->bgpio_lock, flags);
dwapb_write(gpio, GPIO_PORTA_EOI, val);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
static void dwapb_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
unsigned long flags;
u32 val;
spin_lock_irqsave(&gc->bgpio_lock, flags);
val = dwapb_read(gpio, GPIO_INTMASK) | BIT(irqd_to_hwirq(d));
dwapb_write(gpio, GPIO_INTMASK, val);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
static void dwapb_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
unsigned long flags;
u32 val;
spin_lock_irqsave(&gc->bgpio_lock, flags);
val = dwapb_read(gpio, GPIO_INTMASK) & ~BIT(irqd_to_hwirq(d));
dwapb_write(gpio, GPIO_INTMASK, val);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
static void dwapb_irq_enable(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
unsigned long flags;
u32 val;
spin_lock_irqsave(&gc->bgpio_lock, flags);
val = dwapb_read(gpio, GPIO_INTEN);
val |= BIT(irqd_to_hwirq(d));
dwapb_write(gpio, GPIO_INTEN, val);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
static void dwapb_irq_disable(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
unsigned long flags;
u32 val;
spin_lock_irqsave(&gc->bgpio_lock, flags);
val = dwapb_read(gpio, GPIO_INTEN);
val &= ~BIT(irqd_to_hwirq(d));
dwapb_write(gpio, GPIO_INTEN, val);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
}
static int dwapb_irq_set_type(struct irq_data *d, u32 type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
irq_hw_number_t bit = irqd_to_hwirq(d);
unsigned long level, polarity, flags;
if (type & ~IRQ_TYPE_SENSE_MASK)
return -EINVAL;
spin_lock_irqsave(&gc->bgpio_lock, flags);
level = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
polarity = dwapb_read(gpio, GPIO_INT_POLARITY);
switch (type) {
case IRQ_TYPE_EDGE_BOTH:
level |= BIT(bit);
dwapb_toggle_trigger(gpio, bit);
break;
case IRQ_TYPE_EDGE_RISING:
level |= BIT(bit);
polarity |= BIT(bit);
break;
case IRQ_TYPE_EDGE_FALLING:
level |= BIT(bit);
polarity &= ~BIT(bit);
break;
case IRQ_TYPE_LEVEL_HIGH:
level &= ~BIT(bit);
polarity |= BIT(bit);
break;
case IRQ_TYPE_LEVEL_LOW:
level &= ~BIT(bit);
polarity &= ~BIT(bit);
break;
}
if (type & IRQ_TYPE_LEVEL_MASK)
irq_set_handler_locked(d, handle_level_irq);
else if (type & IRQ_TYPE_EDGE_BOTH)
irq_set_handler_locked(d, handle_edge_irq);
dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
if (type != IRQ_TYPE_EDGE_BOTH)
dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int dwapb_irq_set_wake(struct irq_data *d, unsigned int enable)
{
struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
struct dwapb_gpio *gpio = igc->private;
struct dwapb_context *ctx = gpio->ports[0].ctx;
irq_hw_number_t bit = irqd_to_hwirq(d);
if (enable)
ctx->wake_en |= BIT(bit);
else
ctx->wake_en &= ~BIT(bit);
return 0;
}
#endif
static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
unsigned offset, unsigned debounce)
{
struct dwapb_gpio_port *port = gpiochip_get_data(gc);
struct dwapb_gpio *gpio = port->gpio;
unsigned long flags, val_deb;
unsigned long mask = BIT(offset);
spin_lock_irqsave(&gc->bgpio_lock, flags);
val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
if (debounce)
val_deb |= mask;
else
val_deb &= ~mask;
dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
return 0;
}
static int dwapb_gpio_set_config(struct gpio_chip *gc, unsigned 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 dwapb_gpio_set_debounce(gc, offset, debounce);
}
static int dwapb_convert_irqs(struct dwapb_gpio_port_irqchip *pirq,
struct dwapb_port_property *pp)
{
int i;
/* Group all available IRQs into an array of parental IRQs. */
for (i = 0; i < pp->ngpio; ++i) {
if (!pp->irq[i])
continue;
pirq->irq[pirq->nr_irqs++] = pp->irq[i];
}
return pirq->nr_irqs ? 0 : -ENOENT;
}
static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
struct dwapb_gpio_port *port,
struct dwapb_port_property *pp)
{
struct dwapb_gpio_port_irqchip *pirq;
struct gpio_chip *gc = &port->gc;
struct gpio_irq_chip *girq;
int err;
pirq = devm_kzalloc(gpio->dev, sizeof(*pirq), GFP_KERNEL);
if (!pirq)
return;
if (dwapb_convert_irqs(pirq, pp)) {
dev_warn(gpio->dev, "no IRQ for port%d\n", pp->idx);
goto err_kfree_pirq;
}
girq = &gc->irq;
girq->handler = handle_bad_irq;
girq->default_type = IRQ_TYPE_NONE;
port->pirq = pirq;
pirq->irqchip.name = DWAPB_DRIVER_NAME;
pirq->irqchip.irq_ack = dwapb_irq_ack;
pirq->irqchip.irq_mask = dwapb_irq_mask;
pirq->irqchip.irq_unmask = dwapb_irq_unmask;
pirq->irqchip.irq_set_type = dwapb_irq_set_type;
pirq->irqchip.irq_enable = dwapb_irq_enable;
pirq->irqchip.irq_disable = dwapb_irq_disable;
#ifdef CONFIG_PM_SLEEP
pirq->irqchip.irq_set_wake = dwapb_irq_set_wake;
#endif
if (!pp->irq_shared) {
girq->num_parents = pirq->nr_irqs;
girq->parents = pirq->irq;
girq->parent_handler_data = gpio;
girq->parent_handler = dwapb_irq_handler;
} else {
/* This will let us handle the parent IRQ in the driver */
girq->num_parents = 0;
girq->parents = NULL;
girq->parent_handler = NULL;
/*
* Request a shared IRQ since where MFD would have devices
* using the same irq pin
*/
err = devm_request_irq(gpio->dev, pp->irq[0],
dwapb_irq_handler_mfd,
IRQF_SHARED, DWAPB_DRIVER_NAME, gpio);
if (err) {
dev_err(gpio->dev, "error requesting IRQ\n");
goto err_kfree_pirq;
}
}
girq->chip = &pirq->irqchip;
return;
err_kfree_pirq:
devm_kfree(gpio->dev, pirq);
}
static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,
struct dwapb_port_property *pp,
unsigned int offs)
{
struct dwapb_gpio_port *port;
void __iomem *dat, *set, *dirout;
int err;
port = &gpio->ports[offs];
port->gpio = gpio;
port->idx = pp->idx;
#ifdef CONFIG_PM_SLEEP
port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL);
if (!port->ctx)
return -ENOMEM;
#endif
dat = gpio->regs + GPIO_EXT_PORTA + pp->idx * GPIO_EXT_PORT_STRIDE;
set = gpio->regs + GPIO_SWPORTA_DR + pp->idx * GPIO_SWPORT_DR_STRIDE;
dirout = gpio->regs + GPIO_SWPORTA_DDR + pp->idx * GPIO_SWPORT_DDR_STRIDE;
/* This registers 32 GPIO lines per port */
err = bgpio_init(&port->gc, gpio->dev, 4, dat, set, NULL, dirout,
NULL, 0);
if (err) {
dev_err(gpio->dev, "failed to init gpio chip for port%d\n",
port->idx);
return err;
}
#ifdef CONFIG_OF_GPIO
port->gc.of_node = to_of_node(pp->fwnode);
#endif
port->gc.ngpio = pp->ngpio;
port->gc.base = pp->gpio_base;
/* Only port A support debounce */
if (pp->idx == 0)
port->gc.set_config = dwapb_gpio_set_config;
/* Only port A can provide interrupts in all configurations of the IP */
if (pp->idx == 0)
dwapb_configure_irqs(gpio, port, pp);
err = devm_gpiochip_add_data(gpio->dev, &port->gc, port);
if (err) {
dev_err(gpio->dev, "failed to register gpiochip for port%d\n",
port->idx);
return err;
}
return 0;
}
static void dwapb_get_irq(struct device *dev, struct fwnode_handle *fwnode,
struct dwapb_port_property *pp)
{
struct device_node *np = NULL;
int irq = -ENXIO, j;
if (fwnode_property_read_bool(fwnode, "interrupt-controller"))
np = to_of_node(fwnode);
for (j = 0; j < pp->ngpio; j++) {
if (np)
irq = of_irq_get(np, j);
else if (has_acpi_companion(dev))
irq = platform_get_irq_optional(to_platform_device(dev), j);
if (irq > 0)
pp->irq[j] = irq;
}
}
static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
{
struct fwnode_handle *fwnode;
struct dwapb_platform_data *pdata;
struct dwapb_port_property *pp;
int nports;
int i;
nports = device_get_child_node_count(dev);
if (nports == 0)
return ERR_PTR(-ENODEV);
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
pdata->properties = devm_kcalloc(dev, nports, sizeof(*pp), GFP_KERNEL);
if (!pdata->properties)
return ERR_PTR(-ENOMEM);
pdata->nports = nports;
i = 0;
device_for_each_child_node(dev, fwnode) {
pp = &pdata->properties[i++];
pp->fwnode = fwnode;
if (fwnode_property_read_u32(fwnode, "reg", &pp->idx) ||
pp->idx >= DWAPB_MAX_PORTS) {
dev_err(dev,
"missing/invalid port index for port%d\n", i);
fwnode_handle_put(fwnode);
return ERR_PTR(-EINVAL);
}
if (fwnode_property_read_u32(fwnode, "ngpios", &pp->ngpio) &&
fwnode_property_read_u32(fwnode, "snps,nr-gpios", &pp->ngpio)) {
dev_info(dev,
"failed to get number of gpios for port%d\n",
i);
pp->ngpio = DWAPB_MAX_GPIOS;
}
pp->irq_shared = false;
pp->gpio_base = -1;
/*
* Only port A can provide interrupts in all configurations of
* the IP.
*/
if (pp->idx == 0)
dwapb_get_irq(dev, fwnode, pp);
}
return pdata;
}
static void dwapb_assert_reset(void *data)
{
struct dwapb_gpio *gpio = data;
reset_control_assert(gpio->rst);
}
static int dwapb_get_reset(struct dwapb_gpio *gpio)
{
int err;
gpio->rst = devm_reset_control_get_optional_shared(gpio->dev, NULL);
if (IS_ERR(gpio->rst)) {
dev_err(gpio->dev, "Cannot get reset descriptor\n");
return PTR_ERR(gpio->rst);
}
err = reset_control_deassert(gpio->rst);
if (err) {
dev_err(gpio->dev, "Cannot deassert reset lane\n");
return err;
}
return devm_add_action_or_reset(gpio->dev, dwapb_assert_reset, gpio);
}
static void dwapb_disable_clks(void *data)
{
struct dwapb_gpio *gpio = data;
clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
}
static int dwapb_get_clks(struct dwapb_gpio *gpio)
{
int err;
/* Optional bus and debounce clocks */
gpio->clks[0].id = "bus";
gpio->clks[1].id = "db";
err = devm_clk_bulk_get_optional(gpio->dev, DWAPB_NR_CLOCKS,
gpio->clks);
if (err) {
dev_err(gpio->dev, "Cannot get APB/Debounce clocks\n");
return err;
}
err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
if (err) {
dev_err(gpio->dev, "Cannot enable APB/Debounce clocks\n");
return err;
}
return devm_add_action_or_reset(gpio->dev, dwapb_disable_clks, gpio);
}
static const struct of_device_id dwapb_of_match[] = {
{ .compatible = "snps,dw-apb-gpio", .data = (void *)0},
{ .compatible = "apm,xgene-gpio-v2", .data = (void *)GPIO_REG_OFFSET_V2},
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, dwapb_of_match);
static const struct acpi_device_id dwapb_acpi_match[] = {
{"HISI0181", 0},
{"APMC0D07", 0},
{"APMC0D81", GPIO_REG_OFFSET_V2},
{ }
};
MODULE_DEVICE_TABLE(acpi, dwapb_acpi_match);
static int dwapb_gpio_probe(struct platform_device *pdev)
{
unsigned int i;
struct dwapb_gpio *gpio;
int err;
struct device *dev = &pdev->dev;
struct dwapb_platform_data *pdata = dev_get_platdata(dev);
if (!pdata) {
pdata = dwapb_gpio_get_pdata(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
if (!pdata->nports)
return -ENODEV;
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
gpio->dev = &pdev->dev;
gpio->nr_ports = pdata->nports;
err = dwapb_get_reset(gpio);
if (err)
return err;
gpio->ports = devm_kcalloc(&pdev->dev, gpio->nr_ports,
sizeof(*gpio->ports), GFP_KERNEL);
if (!gpio->ports)
return -ENOMEM;
gpio->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(gpio->regs))
return PTR_ERR(gpio->regs);
err = dwapb_get_clks(gpio);
if (err)
return err;
gpio->flags = (uintptr_t)device_get_match_data(dev);
for (i = 0; i < gpio->nr_ports; i++) {
err = dwapb_gpio_add_port(gpio, &pdata->properties[i], i);
if (err)
return err;
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int dwapb_gpio_suspend(struct device *dev)
{
struct dwapb_gpio *gpio = dev_get_drvdata(dev);
struct gpio_chip *gc = &gpio->ports[0].gc;
unsigned long flags;
int i;
spin_lock_irqsave(&gc->bgpio_lock, flags);
for (i = 0; i < gpio->nr_ports; i++) {
unsigned int offset;
unsigned int idx = gpio->ports[i].idx;
struct dwapb_context *ctx = gpio->ports[i].ctx;
offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_STRIDE;
ctx->dir = dwapb_read(gpio, offset);
offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_STRIDE;
ctx->data = dwapb_read(gpio, offset);
offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_STRIDE;
ctx->ext = dwapb_read(gpio, offset);
/* Only port A can provide interrupts */
if (idx == 0) {
ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK);
ctx->int_en = dwapb_read(gpio, GPIO_INTEN);
ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY);
ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);
/* Mask out interrupts */
dwapb_write(gpio, GPIO_INTMASK, ~ctx->wake_en);
}
}
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
clk_bulk_disable_unprepare(DWAPB_NR_CLOCKS, gpio->clks);
return 0;
}
static int dwapb_gpio_resume(struct device *dev)
{
struct dwapb_gpio *gpio = dev_get_drvdata(dev);
struct gpio_chip *gc = &gpio->ports[0].gc;
unsigned long flags;
int i, err;
err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
if (err) {
dev_err(gpio->dev, "Cannot reenable APB/Debounce clocks\n");
return err;
}
spin_lock_irqsave(&gc->bgpio_lock, flags);
for (i = 0; i < gpio->nr_ports; i++) {
unsigned int offset;
unsigned int idx = gpio->ports[i].idx;
struct dwapb_context *ctx = gpio->ports[i].ctx;
offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_STRIDE;
dwapb_write(gpio, offset, ctx->data);
offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_STRIDE;
dwapb_write(gpio, offset, ctx->dir);
offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_STRIDE;
dwapb_write(gpio, offset, ctx->ext);
/* Only port A can provide interrupts */
if (idx == 0) {
dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type);
dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol);
dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb);
dwapb_write(gpio, GPIO_INTEN, ctx->int_en);
dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask);
/* Clear out spurious interrupts */
dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff);
}
}
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend,
dwapb_gpio_resume);
static struct platform_driver dwapb_gpio_driver = {
.driver = {
.name = DWAPB_DRIVER_NAME,
.pm = &dwapb_gpio_pm_ops,
.of_match_table = dwapb_of_match,
.acpi_match_table = dwapb_acpi_match,
},
.probe = dwapb_gpio_probe,
};
module_platform_driver(dwapb_gpio_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamie Iles");
MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver");
MODULE_ALIAS("platform:" DWAPB_DRIVER_NAME);