satip-axe/kernel/drivers/stm/gpio.c

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/*
* drivers/stm/gpio.c
*
* (c) 2010 STMicroelectronics Limited
*
* Authors: Pawel Moll <pawel.moll@st.com>
* Stuart Menefy <stuart.menefy@st.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/stm/platform.h>
#include <linux/stm/pad.h>
#include <linux/stm/pio.h>
#include "reg_pio.h"
#define CONFIG_STPIO
struct stpio_pin {
#ifdef CONFIG_STPIO
void (*func)(struct stpio_pin *pin, void *dev);
void* dev;
unsigned short port_no, pin_no;
#endif
};
struct stm_gpio_pin {
unsigned char flags;
#define PIN_FAKE_EDGE 4
#define PIN_IGNORE_EDGE_FLAG 2
#define PIN_IGNORE_EDGE_VAL 1
#define PIN_IGNORE_RISING_EDGE (PIN_IGNORE_EDGE_FLAG | 0)
#define PIN_IGNORE_FALLING_EDGE (PIN_IGNORE_EDGE_FLAG | 1)
#define PIN_IGNORE_EDGE_MASK (PIN_IGNORE_EDGE_FLAG | PIN_IGNORE_EDGE_VAL)
unsigned char direction;
struct stpio_pin stpio;
};
#define to_stm_gpio_port(chip) \
container_of(chip, struct stm_gpio_port, gpio_chip)
#define sysdev_to_stm_gpio(dev) \
container_of((dev), struct stm_gpio_port, sysdev)
struct stm_gpio_port {
struct gpio_chip gpio_chip;
void *base;
unsigned long irq_level_mask;
struct stm_gpio_pin pins[STM_GPIO_PINS_PER_PORT];
struct sys_device sysdev;
pm_message_t pm_state;
};
struct stm_gpio_irqmux {
void *base;
int port_first;
};
static struct sysdev_class stm_gpio_sysdev_class;
int stm_gpio_num; /* Number of available internal PIOs (pins) */
EXPORT_SYMBOL(stm_gpio_num);
static unsigned int stm_gpio_irq_base; /* First irq number used by PIO "chip" */
static struct stm_gpio_port *stm_gpio_ports; /* PIO port descriptions */
/* PIO port base addresses copy, used by optimized gpio_get_value()
* and gpio_set_value() in include/linux/stm/gpio.h */
void __iomem **stm_gpio_bases;
EXPORT_SYMBOL(stm_gpio_bases);
/*** PIO interrupt chained-handler implementation ***/
static void __stm_gpio_irq_handler(const struct stm_gpio_port *port)
{
int port_no = port - stm_gpio_ports;
int pin_no;
unsigned long port_in, port_mask, port_comp, port_active;
unsigned long port_level_mask = port->irq_level_mask;
/* We don't want to mask the INTC2/ILC first level interrupt here,
* and as these are both level based, there is no need to ack. */
port_in = get__PIO_PIN(port->base);
port_comp = get__PIO_PCOMP(port->base);
port_mask = get__PIO_PMASK(port->base);
port_active = (port_in ^ port_comp) & port_mask;
pr_debug("level_mask = 0x%08lx\n", port_level_mask);
/* Level sensitive interrupts we can mask for the duration */
set__PIO_CLR_PMASK(port->base, port_level_mask);
/* Edge sensitive we want to know about if they change */
set__PIO_CLR_PCOMP(port->base,
~port_level_mask & port_active & port_comp);
set__PIO_SET_PCOMP(port->base,
~port_level_mask & port_active & ~port_comp);
while ((pin_no = ffs(port_active)) != 0) {
unsigned gpio;
struct stm_gpio_pin *pin;
unsigned int pin_irq;
struct irq_desc *pin_irq_desc;
unsigned long pin_mask;
pin_no--;
pr_debug("active = %ld pinno = %d\n", port_active, pin_no);
gpio = stm_gpio(port_no, pin_no);
pin_irq = gpio_to_irq(gpio);
pin_irq_desc = &irq_desc[pin_irq];
pin = get_irq_chip_data(pin_irq);
pin_mask = 1 << pin_no;
port_active &= ~pin_mask;
if (pin->flags & PIN_FAKE_EDGE) {
int value = gpio_get_value(gpio);
pr_debug("pinno %d PIN_FAKE_EDGE val %d\n",
pin_no, value);
if (value)
set__PIO_SET_PCOMP(port->base, pin_mask);
else
set__PIO_CLR_PCOMP(port->base, pin_mask);
if ((pin->flags & PIN_IGNORE_EDGE_MASK) ==
(PIN_IGNORE_EDGE_FLAG | (value ^ 1)))
continue;
}
if (unlikely(pin_irq_desc->status &
(IRQ_INPROGRESS | IRQ_DISABLED))) {
set__PIO_CLR_PMASK(port->base, pin_mask);
/* The unmasking will be done by enable_irq in
* case it is disabled or after returning from
* the handler if it's already running.
*/
if (pin_irq_desc->status & IRQ_INPROGRESS) {
/* Level triggered interrupts won't
* ever be reentered
*/
BUG_ON(port_level_mask & pin_mask);
pin_irq_desc->status |= IRQ_PENDING;
}
continue;
} else {
pin_irq_desc->handle_irq(pin_irq, pin_irq_desc);
/* If our handler has disabled interrupts,
* then don't re-enable them */
if (pin_irq_desc->status & IRQ_DISABLED) {
pr_debug("handler has disabled interrupts!\n");
port_mask &= ~pin_mask;
}
}
if (unlikely((pin_irq_desc->status &
(IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING)) {
pin_irq_desc->status &= ~IRQ_PENDING;
set__PIO_SET_PMASK(port->base, pin_mask);
}
}
/* Re-enable level */
set__PIO_SET_PMASK(port->base, port_level_mask & port_mask);
/* Do we need a software level as well, to cope with interrupts
* which get disabled during the handler execution? */
pr_debug("exiting\n");
}
static void stm_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
struct stm_gpio_port *port = get_irq_data(irq);
__stm_gpio_irq_handler(port);
}
static void stm_gpio_irqmux_handler(unsigned int irq, struct irq_desc *desc)
{
struct stm_gpio_irqmux *irqmux = get_irq_data(irq);
unsigned long status;
int bit;
status = readl(irqmux->base);
while ((bit = ffs(status)) != 0) {
struct stm_gpio_port *port;
bit--;
port = &stm_gpio_ports[irqmux->port_first + bit];
__stm_gpio_irq_handler(port);
status &= ~(1 << bit);
}
}
static void stm_gpio_irq_chip_disable(unsigned int pin_irq)
{
unsigned gpio = irq_to_gpio(pin_irq);
int port_no = stm_gpio_port(gpio);
int pin_no = stm_gpio_pin(gpio);
pr_debug("disabling pin %d\n", pin_no);
set__PIO_CLR_PMASK__CLR_PMASK__CLEAR(stm_gpio_bases[port_no], pin_no);
}
static void stm_gpio_irq_chip_enable(unsigned int pin_irq)
{
unsigned gpio = irq_to_gpio(pin_irq);
int port_no = stm_gpio_port(gpio);
int pin_no = stm_gpio_pin(gpio);
pr_debug("enabling pin %d\n", pin_no);
set__PIO_SET_PMASK__SET_PMASK__SET(stm_gpio_bases[port_no], pin_no);
}
static int stm_gpio_irq_chip_type(unsigned int pin_irq, unsigned type)
{
unsigned gpio = irq_to_gpio(pin_irq);
int port_no = stm_gpio_port(gpio);
int pin_no = stm_gpio_pin(gpio);
struct stm_gpio_port *port = &stm_gpio_ports[port_no];
struct stm_gpio_pin *pin = &port->pins[pin_no];
int comp;
pr_debug("setting pin %d to type %d\n", pin_no, type);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
pin->flags = PIN_FAKE_EDGE | PIN_IGNORE_FALLING_EDGE;
comp = 1;
port->irq_level_mask &= ~(1 << pin_no);
break;
case IRQ_TYPE_LEVEL_HIGH:
pin->flags = 0;
comp = 0;
port->irq_level_mask |= (1 << pin_no);
break;
case IRQ_TYPE_EDGE_FALLING:
pin->flags = PIN_FAKE_EDGE | PIN_IGNORE_RISING_EDGE;
comp = 0;
port->irq_level_mask &= ~(1 << pin_no);
break;
case IRQ_TYPE_LEVEL_LOW:
pin->flags = 0;
comp = 1;
port->irq_level_mask |= (1 << pin_no);
break;
case IRQ_TYPE_EDGE_BOTH:
pin->flags = PIN_FAKE_EDGE;
comp = gpio_get_value(gpio);
port->irq_level_mask &= ~(1 << pin_no);
break;
default:
return -EINVAL;
}
set__PIO_PCOMP__PCOMP(port->base, pin_no, comp);
return 0;
}
static int stm_gpio_irq_chip_wake(unsigned int irq, unsigned int on)
{
return 0;
}
static struct irq_chip stm_gpio_irq_chip = {
.name = "stm_gpio_irq",
.disable = stm_gpio_irq_chip_disable,
.mask = stm_gpio_irq_chip_disable,
.mask_ack = stm_gpio_irq_chip_disable,
.unmask = stm_gpio_irq_chip_enable,
/* STSDK: Need this for STPIO */
.enable = stm_gpio_irq_chip_enable,
.set_type = stm_gpio_irq_chip_type,
.set_wake = stm_gpio_irq_chip_wake,
};
static int stm_gpio_irq_init(int port_no)
{
struct stm_gpio_pin *pin;
unsigned int pin_irq;
int pin_no;
pin = stm_gpio_ports[port_no].pins;
pin_irq = stm_gpio_irq_base + (port_no * STM_GPIO_PINS_PER_PORT);
for (pin_no = 0; pin_no < STM_GPIO_PINS_PER_PORT; pin_no++) {
set_irq_chip_and_handler_name(pin_irq, &stm_gpio_irq_chip,
handle_simple_irq, "stm_gpio");
set_irq_chip_data(pin_irq, pin);
stm_gpio_irq_chip_type(pin_irq, IRQ_TYPE_LEVEL_HIGH);
pin++;
pin_irq++;
}
return 0;
}
/*** Low level hardware manipulation code for gpio/gpiolib and stpio ***/
static inline int __stm_gpio_get(struct stm_gpio_port *port, unsigned offset)
{
return get__PIO_PIN__PIN(port->base, offset);
}
static inline void __stm_gpio_set(struct stm_gpio_port *port, unsigned offset,
int value)
{
if (value)
set__PIO_SET_POUT__SET_POUT__SET(port->base, offset);
else
set__PIO_CLR_POUT__CLR_POUT__CLEAR(port->base, offset);
}
static inline void __stm_gpio_direction(struct stm_gpio_port *port,
unsigned offset, unsigned int direction)
{
WARN_ON(direction != STM_GPIO_DIRECTION_BIDIR &&
direction != STM_GPIO_DIRECTION_OUT &&
direction != STM_GPIO_DIRECTION_IN &&
direction != STM_GPIO_DIRECTION_ALT_OUT &&
direction != STM_GPIO_DIRECTION_ALT_BIDIR);
port->pins[offset].direction = direction;
set__PIO_PCx(port->base, offset, direction);
}
/*** Generic gpio & gpiolib interface implementation ***/
static int stm_gpio_request(struct gpio_chip *chip, unsigned offset)
{
return stm_pad_claim_gpio(chip->base + offset);
}
static void stm_gpio_free(struct gpio_chip *chip, unsigned offset)
{
stm_pad_release_gpio(chip->base + offset);
}
static int stm_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct stm_gpio_port *port = to_stm_gpio_port(chip);
return __stm_gpio_get(port, offset);
}
static void stm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct stm_gpio_port *port = to_stm_gpio_port(chip);
__stm_gpio_set(port, offset, value);
}
static int stm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
stm_pad_configure_gpio(chip->base + offset, STM_GPIO_DIRECTION_IN);
return 0;
}
static int stm_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
struct stm_gpio_port *port = to_stm_gpio_port(chip);
__stm_gpio_set(port, offset, value);
stm_pad_configure_gpio(chip->base + offset, STM_GPIO_DIRECTION_OUT);
return 0;
}
static int stm_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
return stm_gpio_irq_base + chip->base + offset;
}
/* gpiolib doesn't support irq_to_gpio() call... */
int irq_to_gpio(unsigned int irq)
{
if (irq < stm_gpio_irq_base || irq >= stm_gpio_irq_base + stm_gpio_num)
return -EINVAL;
return irq - stm_gpio_irq_base;
}
EXPORT_SYMBOL(irq_to_gpio);
int stm_gpio_direction(unsigned int gpio, unsigned int direction)
{
int port_no = stm_gpio_port(gpio);
int pin_no = stm_gpio_pin(gpio);
BUG_ON(gpio >= stm_gpio_num);
__stm_gpio_direction(&stm_gpio_ports[port_no], pin_no, direction);
return 0;
}
/*** Deprecated stpio_... interface */
#ifdef CONFIG_STPIO
static inline int stpio_pin_to_irq(struct stpio_pin *pin)
{
return gpio_to_irq(stm_gpio(pin->port_no, pin->pin_no));
}
struct stpio_pin *__stpio_request_pin(unsigned int port_no,
unsigned int pin_no, const char *name, int direction,
int __set_value, unsigned int value)
{
struct stm_gpio_port *port;
struct stm_gpio_pin *gpio_pin;
int num_ports = stm_gpio_num / STM_GPIO_PINS_PER_PORT;
if (port_no >= num_ports || pin_no >= STM_GPIO_PINS_PER_PORT)
return NULL;
port = &stm_gpio_ports[port_no];
gpio_pin = &port->pins[pin_no];
if (stm_pad_claim_gpio(stm_gpio(port_no, pin_no)) != 0)
return NULL;
if (__set_value)
__stm_gpio_set(port, pin_no, value);
__stm_gpio_direction(port, pin_no, direction);
gpio_pin->stpio.port_no = port_no;
gpio_pin->stpio.pin_no = pin_no;
return &gpio_pin->stpio;
}
EXPORT_SYMBOL(__stpio_request_pin);
void stpio_free_pin(struct stpio_pin *pin)
{
stm_pad_release_gpio(stm_gpio(pin->port_no, pin->pin_no));
}
EXPORT_SYMBOL(stpio_free_pin);
void stpio_configure_pin(struct stpio_pin *pin, int direction)
{
struct stm_gpio_port *port = &stm_gpio_ports[pin->port_no];
int pin_no = pin->pin_no;
__stm_gpio_direction(port, pin_no, direction);
}
EXPORT_SYMBOL(stpio_configure_pin);
void stpio_set_pin(struct stpio_pin *pin, unsigned int value)
{
struct stm_gpio_port *port = &stm_gpio_ports[pin->port_no];
int pin_no = pin->pin_no;
__stm_gpio_set(port, pin_no, value);
}
EXPORT_SYMBOL(stpio_set_pin);
unsigned int stpio_get_pin(struct stpio_pin *pin)
{
struct stm_gpio_port *port = &stm_gpio_ports[pin->port_no];
int pin_no = pin->pin_no;
return __stm_gpio_get(port, pin_no);
}
EXPORT_SYMBOL(stpio_get_pin);
static irqreturn_t stpio_irq_wrapper(int irq, void *dev_id)
{
struct stpio_pin *pin = dev_id;
pin->func(pin, pin->dev);
return IRQ_HANDLED;
}
int stpio_flagged_request_irq(struct stpio_pin *pin, int comp,
void (*handler)(struct stpio_pin *pin, void *dev),
void *dev, unsigned long flags)
{
int irq;
const char *owner;
int result;
/* stpio style interrupt handling doesn't allow sharing. */
BUG_ON(pin->func);
irq = stpio_pin_to_irq(pin);
pin->func = handler;
pin->dev = dev;
owner = stm_pad_get_gpio_owner(stm_gpio(pin->port_no, pin->pin_no));
set_irq_type(irq, comp ? IRQ_TYPE_LEVEL_LOW : IRQ_TYPE_LEVEL_HIGH);
result = request_irq(irq, stpio_irq_wrapper, 0, owner, pin);
BUG_ON(result);
if (flags & IRQ_DISABLED) {
/* This is a race condition waiting to happen... */
disable_irq(irq);
}
return 0;
}
EXPORT_SYMBOL(stpio_flagged_request_irq);
void stpio_free_irq(struct stpio_pin *pin)
{
int irq = stpio_pin_to_irq(pin);
free_irq(irq, pin);
pin->func = 0;
pin->dev = 0;
}
EXPORT_SYMBOL(stpio_free_irq);
void stpio_enable_irq(struct stpio_pin *pin, int comp)
{
int irq = stpio_pin_to_irq(pin);
set_irq_type(irq, comp ? IRQ_TYPE_LEVEL_LOW : IRQ_TYPE_LEVEL_HIGH);
enable_irq(irq);
}
EXPORT_SYMBOL(stpio_enable_irq);
/* This function is safe to call in an IRQ UNLESS it is called in */
/* the PIO interrupt callback function */
void stpio_disable_irq(struct stpio_pin *pin)
{
int irq = stpio_pin_to_irq(pin);
disable_irq(irq);
}
EXPORT_SYMBOL(stpio_disable_irq);
/* This is safe to call in IRQ context */
void stpio_disable_irq_nosync(struct stpio_pin *pin)
{
int irq = stpio_pin_to_irq(pin);
disable_irq_nosync(irq);
}
EXPORT_SYMBOL(stpio_disable_irq_nosync);
void stpio_set_irq_type(struct stpio_pin* pin, int triggertype)
{
int irq = stpio_pin_to_irq(pin);
set_irq_type(irq, triggertype);
}
EXPORT_SYMBOL(stpio_set_irq_type);
#endif /* CONFIG_STPIO */
#ifdef CONFIG_DEBUG_FS
static void stm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
struct stm_gpio_port *port = to_stm_gpio_port(chip);
int port_no = chip->base / STM_GPIO_PINS_PER_PORT;
int pin_no;
for (pin_no = 0; pin_no < STM_GPIO_PINS_PER_PORT; pin_no++) {
unsigned gpio = stm_gpio(port_no, pin_no);
const char *owner, *direction;
seq_printf(s, " %-3d: PIO%d.%d: ", gpio, port_no, pin_no);
switch (get__PIO_PCx(port->base, pin_no)) {
case value__PIO_PCx__INPUT_WEAK_PULL_UP():
direction = "input (weak pull up)";
break;
case value__PIO_PCx__BIDIR_OPEN_DRAIN():
case value__PIO_PCx__BIDIR_OPEN_DRAIN__alt():
direction = "bidirectional (open drain)";
break;
case value__PIO_PCx__OUTPUT_PUSH_PULL():
direction = "output (push-pull)";
break;
case value__PIO_PCx__INPUT_HIGH_IMPEDANCE():
case value__PIO_PCx__INPUT_HIGH_IMPEDANCE__alt():
direction = "input (high impedance)";
break;
case value__PIO_PCx__ALTERNATIVE_OUTPUT_PUSH_PULL():
direction = "alternative function output "
"(push-pull)";
break;
case value__PIO_PCx__ALTERNATIVE_BIDIR_OPEN_DRAIN():
direction = "alternative function bidirectional "
"(open drain)";
break;
default:
/* Should never get here... */
__WARN();
direction = "unknown configuration";
break;
}
seq_printf(s, "%s, ", direction);
owner = gpiochip_is_requested(chip, pin_no);
if (owner) {
unsigned irq = gpio_to_irq(gpio);
struct irq_desc *desc = irq_desc + irq;
seq_printf(s, "allocated by GPIO to '%s'", owner);
/* This races with request_irq(), set_irq_type(),
* and set_irq_wake() ... but those are "rare".
*
* More significantly, trigger type flags aren't
* currently maintained by genirq. */
if (desc->action) {
char *trigger;
switch (desc->status & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_NONE:
trigger = "default";
break;
case IRQ_TYPE_EDGE_FALLING:
trigger = "edge-falling";
break;
case IRQ_TYPE_EDGE_RISING:
trigger = "edge-rising";
break;
case IRQ_TYPE_EDGE_BOTH:
trigger = "edge-both";
break;
case IRQ_TYPE_LEVEL_HIGH:
trigger = "level-high";
break;
case IRQ_TYPE_LEVEL_LOW:
trigger = "level-low";
break;
default:
__WARN();
trigger = "unknown";
break;
}
seq_printf(s, " and IRQ %d (%s trigger%s)",
irq, trigger,
(desc->status & IRQ_WAKEUP)
? " wakeup" : "");
}
seq_printf(s, "\n");
} else {
owner = stm_pad_get_gpio_owner(stm_gpio(port_no,
pin_no));
if (owner) {
seq_printf(s, "allocated by pad manager "
"to '%s'\n", owner);
} else {
seq_printf(s, "unused\n");
}
}
}
}
#endif
/*** Early initialization ***/
/* This is called early to allow board start up code to use PIO
* (in particular console devices). */
void __init stm_gpio_early_init(struct platform_device pdevs[], int num,
int irq_base)
{
int port_no;
stm_gpio_num = num * STM_GPIO_PINS_PER_PORT;
stm_gpio_irq_base = irq_base;
stm_gpio_ports = alloc_bootmem(sizeof(*stm_gpio_ports) * num);
stm_gpio_bases = alloc_bootmem(sizeof(*stm_gpio_bases) * num);
if (!stm_gpio_ports || !stm_gpio_bases)
panic("stm_gpio: Can't get bootmem!\n");
for (port_no = 0; port_no < num; port_no++) {
struct platform_device *pdev = &pdevs[port_no];
struct resource *memory;
struct stm_gpio_port *port = &stm_gpio_ports[port_no];
/* Skip non existing ports */
if (!pdev->name)
continue;
memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!memory)
panic("stm_gpio: Can't find memory resource!\n");
port->base = ioremap(memory->start,
memory->end - memory->start + 1);
if (!port->base)
panic("stm_gpio: Can't get IO memory mapping!\n");
port->gpio_chip.request = stm_gpio_request;
port->gpio_chip.free = stm_gpio_free;
port->gpio_chip.get = stm_gpio_get;
port->gpio_chip.set = stm_gpio_set;
port->gpio_chip.direction_input = stm_gpio_direction_input;
port->gpio_chip.direction_output = stm_gpio_direction_output;
port->gpio_chip.to_irq = stm_gpio_to_irq;
#ifdef CONFIG_DEBUG_FS
port->gpio_chip.dbg_show = stm_gpio_dbg_show;
#endif
port->gpio_chip.base = port_no * STM_GPIO_PINS_PER_PORT;
port->gpio_chip.ngpio = STM_GPIO_PINS_PER_PORT;
stm_gpio_bases[port_no] = port->base;
if (gpiochip_add(&port->gpio_chip) != 0)
panic("stm_gpio: Failed to add gpiolib chip!\n");
}
}
/*** PIO bank platform device driver ***/
static int __devinit stm_gpio_probe(struct platform_device *pdev)
{
int port_no = pdev->id;
struct stm_gpio_port *port = &stm_gpio_ports[port_no];
struct resource *memory;
int irq;
int ret;
BUG_ON(port_no < 0);
BUG_ON(port_no >= stm_gpio_num);
memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!memory)
return -EINVAL;
if (!request_mem_region(memory->start,
memory->end - memory->start + 1, pdev->name))
return -EBUSY;
irq = platform_get_irq(pdev, 0);
if (irq >= 0) {
set_irq_chained_handler(irq, stm_gpio_irq_handler);
set_irq_data(irq, &stm_gpio_ports[port_no]);
if (stm_gpio_irq_init(port_no) != 0) {
printk(KERN_ERR "stm_gpio: Failed to init gpio "
"interrupt!\n");
return -EINVAL;
}
}
port->gpio_chip.label = dev_name(&pdev->dev);
dev_set_drvdata(&pdev->dev, port);
port->sysdev.id = port_no;
port->sysdev.cls = &stm_gpio_sysdev_class;
ret = sysdev_register(&port->sysdev);
if (ret)
return ret;
/* This is a good time to check consistency of linux/stm/gpio.h
* declarations with the proper source... */
BUG_ON(STM_GPIO_REG_SET_POUT != offset__PIO_SET_POUT());
BUG_ON(STM_GPIO_REG_CLR_POUT != offset__PIO_CLR_POUT());
BUG_ON(STM_GPIO_REG_PIN != offset__PIO_PIN());
BUG_ON(STM_GPIO_DIRECTION_BIDIR != value__PIO_PCx__BIDIR_OPEN_DRAIN());
BUG_ON(STM_GPIO_DIRECTION_OUT != value__PIO_PCx__OUTPUT_PUSH_PULL());
BUG_ON(STM_GPIO_DIRECTION_IN != value__PIO_PCx__INPUT_HIGH_IMPEDANCE());
BUG_ON(STM_GPIO_DIRECTION_ALT_OUT !=
value__PIO_PCx__ALTERNATIVE_OUTPUT_PUSH_PULL());
BUG_ON(STM_GPIO_DIRECTION_ALT_BIDIR !=
value__PIO_PCx__ALTERNATIVE_BIDIR_OPEN_DRAIN());
return 0;
}
static struct platform_driver stm_gpio_driver = {
.driver = {
.name = "stm-gpio",
.owner = THIS_MODULE,
},
.probe = stm_gpio_probe,
};
/*** PIO IRQ status register platform device driver ***/
static int __devinit stm_gpio_irqmux_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct stm_plat_pio_irqmux_data *plat_data = dev->platform_data;
struct stm_gpio_irqmux *irqmux;
struct resource *memory;
int irq;
int port_no;
BUG_ON(!plat_data);
irqmux = devm_kzalloc(dev, sizeof(*irqmux), GFP_KERNEL);
if (!irqmux)
return -ENOMEM;
memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!memory || irq < 0)
return -EINVAL;
if (!devm_request_mem_region(dev, memory->start,
memory->end - memory->start + 1, pdev->name))
return -EBUSY;
irqmux->base = devm_ioremap_nocache(dev, memory->start,
memory->end - memory->start + 1);
if (!irqmux->base)
return -ENOMEM;
irqmux->port_first = plat_data->port_first;
set_irq_chained_handler(irq, stm_gpio_irqmux_handler);
set_irq_data(irq, irqmux);
for (port_no = irqmux->port_first;
port_no < irqmux->port_first + plat_data->ports_num;
port_no++) {
BUG_ON(port_no >= stm_gpio_num);
if (stm_gpio_irq_init(port_no) != 0) {
printk(KERN_ERR "stm_gpio: Failed to init gpio "
"interrupt for port %d!\n", port_no);
return -EINVAL;
}
}
return 0;
}
static struct platform_driver stm_gpio_irqmux_driver = {
.driver = {
.name = "stm-gpio-irqmux",
.owner = THIS_MODULE,
},
.probe = stm_gpio_irqmux_probe,
};
/*** Drivers initialization ***/
#ifdef CONFIG_PM
static int stm_gpio_hibernation_resume(struct stm_gpio_port *port)
{
int pin_no;
for (pin_no = 0; pin_no < port->gpio_chip.ngpio; ++pin_no)
/*
* Direction can not be zero!
* Zero means 'un-claimed'
*/
if (port->pins[pin_no].direction)
__stm_gpio_direction(port, pin_no,
port->pins[pin_no].direction);
return 0;
}
static int stm_gpio_suspend(struct stm_gpio_port *port)
{
int port_no = port - stm_gpio_ports;
int pin_no;
/* Enable the wakeup pin IRQ if required */
for (pin_no = 0; pin_no < port->gpio_chip.ngpio; ++pin_no) {
int irq = gpio_to_irq(stm_gpio(port_no, pin_no));
struct irq_desc *desc = irq_to_desc(irq);
if (IRQ_WAKEUP & desc->status)
stm_gpio_irq_chip_enable(irq);
else
stm_gpio_irq_chip_disable(irq);
}
return 0;
}
static int stm_gpio_sysdev_suspend(struct sys_device *dev, pm_message_t state)
{
struct stm_gpio_port *port = sysdev_to_stm_gpio(dev);
int ret = 0;
switch (state.event) {
case PM_EVENT_ON:
if (port->pm_state.event != PM_EVENT_FREEZE)
break;
ret = stm_gpio_hibernation_resume(port);
break;
case PM_EVENT_SUSPEND:
ret = stm_gpio_suspend(port);
break;
case PM_EVENT_FREEZE:
/* do nothing */
break;
}
port->pm_state = state;
return ret;
}
static int stm_gpio_sysdev_resume(struct sys_device *dev)
{
return stm_gpio_sysdev_suspend(dev, PMSG_ON);
}
#else
#define stm_gpio_sysdev_suspend NULL
#define stm_gpio_sysdev_resume NULL
#endif
static struct sysdev_class stm_gpio_sysdev_class = {
.name = "stm-gpio",
.suspend = stm_gpio_sysdev_suspend,
.resume = stm_gpio_sysdev_resume,
};
static int __init stm_gpio_init(void)
{
int ret;
ret = sysdev_class_register(&stm_gpio_sysdev_class);
if (ret)
return ret;
ret = platform_driver_register(&stm_gpio_driver);
if (ret)
return ret;
ret = platform_driver_register(&stm_gpio_irqmux_driver);
if (ret)
return ret;
return ret;
}
postcore_initcall(stm_gpio_init);