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[ifxmips] implement gpiolib drivers for core gpio and ebu attached latches

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20418 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
blogic
2010-03-25 11:50:46 +00:00
parent c4a3b1979a
commit dd98c76b9a
7 changed files with 501 additions and 258 deletions
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243
target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c
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@@ -36,6 +36,7 @@
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/semaphore.h>
#include <linux/gpio.h>
#include <net/sock.h>
@@ -44,27 +45,13 @@
#define MAX_PORTS 2
#define PINS_PER_PORT 16
#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
unsigned int rst_port = 1;
unsigned int rst_pin = 15;
static struct timer_list rst_button_timer;
extern struct sock *uevent_sock;
extern u64 uevent_next_seqnum(void);
static unsigned long seen;
static int pressed;
struct event_t {
struct work_struct wq;
int set;
unsigned long jiffies;
};
#endif
#define IFXMIPS_GPIO_SANITY {if (port > MAX_PORTS || pin > PINS_PER_PORT) return -EINVAL; }
int ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
#define GPIO_TO_PORT(x) ((x > 15) ? (1) : (0))
#define GPIO_TO_GPIO(x) ((x > 15) ? (x - 16) : (x))
int
ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
printk(KERN_INFO "%s : call to obseleted function\n", __func__);
@@ -72,7 +59,8 @@ int ifxmips_port_reserve_pin(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_reserve_pin);
int ifxmips_port_free_pin(unsigned int port, unsigned int pin)
int
ifxmips_port_free_pin(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
printk(KERN_INFO "%s : call to obseleted function\n", __func__);
@@ -80,7 +68,8 @@ int ifxmips_port_free_pin(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_free_pin);
int ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
int
ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) | (1 << pin),
@@ -89,7 +78,8 @@ int ifxmips_port_set_open_drain(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_open_drain);
int ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
int
ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OD + (port * 0xC)) & ~(1 << pin),
@@ -98,7 +88,8 @@ int ifxmips_port_clear_open_drain(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_clear_open_drain);
int ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
int
ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) | (1 << pin),
@@ -107,7 +98,8 @@ int ifxmips_port_set_pudsel(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_pudsel);
int ifxmips_port_clear_pudsel(unsigned int port, unsigned int pin)
int
ifxmips_port_clear_pudsel(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDSEL + (port * 0xC)) & ~(1 << pin),
@@ -116,7 +108,8 @@ int ifxmips_port_clear_pudsel(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_clear_pudsel);
int ifxmips_port_set_puden(unsigned int port, unsigned int pin)
int
ifxmips_port_set_puden(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) | (1 << pin),
@@ -125,7 +118,8 @@ int ifxmips_port_set_puden(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_puden);
int ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
int
ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_PUDEN + (port * 0xC)) & ~(1 << pin),
@@ -134,7 +128,8 @@ int ifxmips_port_clear_puden(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_clear_puden);
int ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
int
ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) | (1 << pin),
@@ -143,7 +138,8 @@ int ifxmips_port_set_stoff(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_stoff);
int ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
int
ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_STOFF + (port * 0xC)) & ~(1 << pin),
@@ -152,7 +148,8 @@ int ifxmips_port_clear_stoff(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_clear_stoff);
int ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
int
ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) | (1 << pin),
@@ -161,7 +158,8 @@ int ifxmips_port_set_dir_out(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_dir_out);
int ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
int
ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_DIR + (port * 0xC)) & ~(1 << pin),
@@ -170,7 +168,8 @@ int ifxmips_port_set_dir_in(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_dir_in);
int ifxmips_port_set_output(unsigned int port, unsigned int pin)
int
ifxmips_port_set_output(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) | (1 << pin),
@@ -179,7 +178,8 @@ int ifxmips_port_set_output(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_output);
int ifxmips_port_clear_output(unsigned int port, unsigned int pin)
int
ifxmips_port_clear_output(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_OUT + (port * 0xC)) & ~(1 << pin),
@@ -188,7 +188,8 @@ int ifxmips_port_clear_output(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_clear_output);
int ifxmips_port_get_input(unsigned int port, unsigned int pin)
int
ifxmips_port_get_input(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
if (ifxmips_r32(IFXMIPS_GPIO_P0_IN + (port * 0xC)) & (1 << pin))
@@ -198,7 +199,8 @@ int ifxmips_port_get_input(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_get_input);
int ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
int
ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) | (1 << pin),
@@ -207,7 +209,8 @@ int ifxmips_port_set_altsel0(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_altsel0);
int ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
int
ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL0 + (port * 0xC)) & ~(1 << pin),
@@ -216,7 +219,8 @@ int ifxmips_port_clear_altsel0(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_clear_altsel0);
int ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
int
ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) | (1 << pin),
@@ -225,7 +229,8 @@ int ifxmips_port_set_altsel1(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_set_altsel1);
int ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
int
ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
{
IFXMIPS_GPIO_SANITY;
ifxmips_w32(ifxmips_r32(IFXMIPS_GPIO_P0_ALTSEL1 + (port * 0xC)) & ~(1 << pin),
@@ -234,105 +239,85 @@ int ifxmips_port_clear_altsel1(unsigned int port, unsigned int pin)
}
EXPORT_SYMBOL(ifxmips_port_clear_altsel1);
#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
static inline void add_msg(struct sk_buff *skb, char *msg)
static void
ifxmips_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
{
char *scratch;
scratch = skb_put(skb, strlen(msg) + 1);
sprintf(scratch, msg);
int port = GPIO_TO_PORT(offset);
int gpio = GPIO_TO_GPIO(offset);
if(value)
ifxmips_port_set_output(port, gpio);
else
ifxmips_port_clear_output(port, gpio);
}
static void hotplug_button(struct work_struct *wq)
static int
ifxmips_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct sk_buff *skb;
struct event_t *event;
size_t len;
char *scratch, *s;
char buf[128];
event = container_of(wq, struct event_t, wq);
if (!uevent_sock)
goto done;
s = event->set ? "pressed" : "released";
len = strlen(s) + 2;
skb = alloc_skb(len + 2048, GFP_KERNEL);
if (!skb)
goto done;
scratch = skb_put(skb, len);
sprintf(scratch, "%s@", s);
add_msg(skb, "HOME=/");
add_msg(skb, "PATH=/sbin:/bin:/usr/sbin:/usr/bin");
add_msg(skb, "SUBSYSTEM=button");
add_msg(skb, "BUTTON=reset");
add_msg(skb, (event->set ? "ACTION=pressed" : "ACTION=released"));
sprintf(buf, "SEEN=%ld", (event->jiffies - seen)/HZ);
add_msg(skb, buf);
snprintf(buf, 128, "SEQNUM=%llu", uevent_next_seqnum());
add_msg(skb, buf);
NETLINK_CB(skb).dst_group = 1;
netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL);
done:
kfree(event);
int port = GPIO_TO_PORT(offset);
int gpio = GPIO_TO_GPIO(offset);
return ifxmips_port_get_input(port, gpio);
}
static void reset_button_poll(unsigned long unused)
static int
ifxmips_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
{
struct event_t *event;
rst_button_timer.expires = jiffies + (HZ / 4);
add_timer(&rst_button_timer);
if (pressed != ifxmips_port_get_input(rst_port, rst_pin)) {
if (pressed)
pressed = 0;
else
pressed = 1;
event = kzalloc(sizeof(struct event_t), GFP_ATOMIC);
if (!event) {
printk(KERN_INFO "Could not alloc hotplug event\n");
return;
}
event->set = pressed;
event->jiffies = jiffies;
INIT_WORK(&event->wq, (void *)(void *)hotplug_button);
schedule_work(&event->wq);
seen = jiffies;
}
}
#endif
static int ifxmips_gpio_probe(struct platform_device *dev)
{
int retval = 0;
#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
rst_port = dev->resource[0].start;
rst_pin = dev->resource[0].end;
ifxmips_port_set_open_drain(rst_port, rst_pin);
ifxmips_port_clear_altsel0(rst_port, rst_pin);
ifxmips_port_clear_altsel1(rst_port, rst_pin);
ifxmips_port_set_dir_in(rst_port, rst_pin);
seen = jiffies;
init_timer(&rst_button_timer);
rst_button_timer.function = reset_button_poll;
rst_button_timer.expires = jiffies + HZ;
add_timer(&rst_button_timer);
#endif
return retval;
}
static int ifxmips_gpio_remove(struct platform_device *pdev)
{
#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
del_timer_sync(&rst_button_timer);
#endif
int port = GPIO_TO_PORT(offset);
int gpio = GPIO_TO_GPIO(offset);
ifxmips_port_set_open_drain(port, gpio);
ifxmips_port_clear_altsel0(port, gpio);
ifxmips_port_clear_altsel1(port, gpio);
ifxmips_port_set_dir_in(port, gpio);
return 0;
}
static struct platform_driver ifxmips_gpio_driver = {
static int
ifxmips_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
{
int port = GPIO_TO_PORT(offset);
int gpio = GPIO_TO_GPIO(offset);
ifxmips_port_clear_open_drain(port, gpio);
ifxmips_port_clear_altsel0(port, gpio);
ifxmips_port_clear_altsel1(port, gpio);
ifxmips_port_set_dir_out(port, gpio);
ifxmips_gpio_set(chip, offset, value);
return 0;
}
int
gpio_to_irq(unsigned int gpio)
{
return -EINVAL;
}
EXPORT_SYMBOL(gpio_to_irq);
struct gpio_chip
ifxmips_gpio_chip =
{
.label = "ifxmips-gpio",
.direction_input = ifxmips_gpio_direction_input,
.direction_output = ifxmips_gpio_direction_output,
.get = ifxmips_gpio_get,
.set = ifxmips_gpio_set,
.base = 0,
.ngpio = 32,
};
static int
ifxmips_gpio_probe(struct platform_device *dev)
{
gpiochip_add(&ifxmips_gpio_chip);
return 0;
}
static int
ifxmips_gpio_remove(struct platform_device *pdev)
{
gpiochip_remove(&ifxmips_gpio_chip);
return 0;
}
static struct platform_driver
ifxmips_gpio_driver = {
.probe = ifxmips_gpio_probe,
.remove = ifxmips_gpio_remove,
.driver = {
@@ -341,7 +326,8 @@ static struct platform_driver ifxmips_gpio_driver = {
},
};
int __init ifxmips_gpio_init(void)
int __init
ifxmips_gpio_init(void)
{
int ret = platform_driver_register(&ifxmips_gpio_driver);
if (ret)
@@ -349,7 +335,8 @@ int __init ifxmips_gpio_init(void)
return ret;
}
void __exit ifxmips_gpio_exit(void)
void __exit
ifxmips_gpio_exit(void)
{
platform_driver_unregister(&ifxmips_gpio_driver);
}