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path: root/target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c
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Diffstat (limited to 'target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c')
-rw-r--r--target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c231
1 files changed, 109 insertions, 122 deletions
diff --git a/target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c b/target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c
index 3ef5100ab2..1ac00ded5b 100644
--- a/target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c
+++ b/target/linux/ifxmips/files/arch/mips/ifxmips/gpio.c
@@ -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;
- }
+ 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;
}
-#endif
-static int ifxmips_gpio_probe(struct platform_device *dev)
+static int
+ifxmips_gpio_direction_output(struct gpio_chip *chip, unsigned int offset, int value)
{
- 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;
+ 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)
+static int
+ifxmips_gpio_remove(struct platform_device *pdev)
{
-#ifdef CONFIG_IFXMIPS_GPIO_RST_BTN
- del_timer_sync(&rst_button_timer);
-#endif
+ gpiochip_remove(&ifxmips_gpio_chip);
return 0;
}
-static struct platform_driver ifxmips_gpio_driver = {
+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);
}