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[ARM] orion: convert gpio to use gpiolib 

Signed-off-by: Erik Benada <erikbenada@yahoo.ca>

[ nico: fix locking, additional cleanups ]

Signed-off-by: Nicolas Pitre <nico@marvell.com>
hifive-unleashed-5.1
Erik Benada 2009-05-28 17:08:55 -07:00 committed by Nicolas Pitre
parent f14081e109
commit a88656553d
6 changed files with 101 additions and 134 deletions
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3
arch/arm/Kconfig
View File

@ -398,6 +398,7 @@ config ARCH_KIRKWOOD
select CPU_FEROCEON
select PCI
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION
@ -441,6 +442,7 @@ config ARCH_MV78XX0
select CPU_FEROCEON
select PCI
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION
@ -465,6 +467,7 @@ config ARCH_ORION5X
select CPU_FEROCEON
select PCI
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION

3
arch/arm/mach-kirkwood/mpp.c
View File

@ -48,6 +48,9 @@ void __init kirkwood_mpp_conf(unsigned int *mpp_list)
if (!variant_mask)
return;
/* Initialize gpiolib. */
orion_gpio_init();
printk(KERN_DEBUG "initial MPP regs:");
for (i = 0; i < MPP_NR_REGS; i++) {
mpp_ctrl[i] = readl(MPP_CTRL(i));

3
arch/arm/mach-mv78xx0/irq.c
View File

@ -28,6 +28,9 @@ void __init mv78xx0_init_irq(void)
{
int i;
/* Initialize gpiolib. */
orion_gpio_init();
orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
orion_irq_init(64, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_ERR_OFF));

3
arch/arm/mach-orion5x/mpp.c
View File

@ -124,6 +124,9 @@ void __init orion5x_mpp_conf(struct orion5x_mpp_mode *mode)
u32 mpp_8_15_ctrl = readl(MPP_8_15_CTRL);
u32 mpp_16_19_ctrl = readl(MPP_16_19_CTRL);
/* Initialize gpiolib. */
orion_gpio_init();
while (mode->mpp >= 0) {
u32 *reg;
int num_type;

206
arch/arm/plat-orion/gpio.c
View File

@ -15,10 +15,9 @@
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <asm/gpio.h>
#include <linux/gpio.h>
static DEFINE_SPINLOCK(gpio_lock);
static const char *gpio_label[GPIO_MAX]; /* non null for allocated GPIOs */
static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)];
static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)];
@ -46,82 +45,54 @@ static void __set_level(unsigned pin, int high)
writel(u, GPIO_OUT(pin));
}
static inline void __set_blinking(unsigned pin, int blink)
{
u32 u;
u = readl(GPIO_BLINK_EN(pin));
if (blink)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_BLINK_EN(pin));
}
static inline int orion_gpio_is_valid(unsigned pin, int mode)
{
if (pin < GPIO_MAX) {
if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input))
goto err_out;
if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output))
goto err_out;
return true;
}
err_out:
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return false;
}
/*
* GENERIC_GPIO primitives.
*/
int gpio_direction_input(unsigned pin)
static int orion_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
{
unsigned long flags;
if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid_input)) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
if (!orion_gpio_is_valid(pin, GPIO_INPUT_OK))
return -EINVAL;
}
spin_lock_irqsave(&gpio_lock, flags);
/*
* Some callers might not have used gpio_request(),
* so flag this pin as requested now.
*/
if (gpio_label[pin] == NULL)
gpio_label[pin] = "?";
/*
* Configure GPIO direction.
*/
/* Configure GPIO direction. */
__set_direction(pin, 1);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_input);
int gpio_direction_output(unsigned pin, int value)
{
unsigned long flags;
u32 u;
if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid_output)) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return -EINVAL;
}
spin_lock_irqsave(&gpio_lock, flags);
/*
* Some callers might not have used gpio_request(),
* so flag this pin as requested now.
*/
if (gpio_label[pin] == NULL)
gpio_label[pin] = "?";
/*
* Disable blinking.
*/
u = readl(GPIO_BLINK_EN(pin));
u &= ~(1 << (pin & 31));
writel(u, GPIO_BLINK_EN(pin));
/*
* Configure GPIO output value.
*/
__set_level(pin, value);
/*
* Configure GPIO direction.
*/
__set_direction(pin, 0);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_output);
int gpio_get_value(unsigned pin)
static int orion_gpio_get_value(struct gpio_chip *chip, unsigned pin)
{
int val;
@ -132,83 +103,75 @@ int gpio_get_value(unsigned pin)
return (val >> (pin & 31)) & 1;
}
EXPORT_SYMBOL(gpio_get_value);
void gpio_set_value(unsigned pin, int value)
static int orion_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
int value)
{
unsigned long flags;
u32 u;
if (!orion_gpio_is_valid(pin, GPIO_OUTPUT_OK))
return -EINVAL;
spin_lock_irqsave(&gpio_lock, flags);
/*
* Disable blinking.
*/
u = readl(GPIO_BLINK_EN(pin));
u &= ~(1 << (pin & 31));
writel(u, GPIO_BLINK_EN(pin));
/* Disable blinking. */
__set_blinking(pin, 0);
/*
* Configure GPIO output value.
*/
/* Configure GPIO output value. */
__set_level(pin, value);
/* Configure GPIO direction. */
__set_direction(pin, 0);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
static void orion_gpio_set_value(struct gpio_chip *chip, unsigned pin,
int value)
{
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
/* Configure GPIO output value. */
__set_level(pin, value);
spin_unlock_irqrestore(&gpio_lock, flags);
}
EXPORT_SYMBOL(gpio_set_value);
int gpio_request(unsigned pin, const char *label)
static int orion_gpio_request(struct gpio_chip *chip, unsigned pin)
{
unsigned long flags;
int ret;
if (pin >= GPIO_MAX ||
!(test_bit(pin, gpio_valid_input) ||
test_bit(pin, gpio_valid_output))) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return -EINVAL;
}
spin_lock_irqsave(&gpio_lock, flags);
if (gpio_label[pin] == NULL) {
gpio_label[pin] = label ? label : "?";
ret = 0;
} else {
pr_debug("%s: GPIO %d already used as %s\n",
__func__, pin, gpio_label[pin]);
ret = -EBUSY;
}
spin_unlock_irqrestore(&gpio_lock, flags);
return ret;
if (orion_gpio_is_valid(pin, GPIO_INPUT_OK) ||
orion_gpio_is_valid(pin, GPIO_OUTPUT_OK))
return 0;
return -EINVAL;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned pin)
static struct gpio_chip orion_gpiochip = {
.label = "orion_gpio",
.direction_input = orion_gpio_direction_input,
.get = orion_gpio_get_value,
.direction_output = orion_gpio_direction_output,
.set = orion_gpio_set_value,
.request = orion_gpio_request,
.base = 0,
.ngpio = GPIO_MAX,
.can_sleep = 0,
};
void __init orion_gpio_init(void)
{
if (pin >= GPIO_MAX ||
!(test_bit(pin, gpio_valid_input) ||
test_bit(pin, gpio_valid_output))) {
pr_debug("%s: invalid GPIO %d\n", __func__, pin);
return;
}
if (gpio_label[pin] == NULL)
pr_warning("%s: GPIO %d already freed\n", __func__, pin);
else
gpio_label[pin] = NULL;
gpiochip_add(&orion_gpiochip);
}
EXPORT_SYMBOL(gpio_free);
/*
* Orion-specific GPIO API extensions.
*/
void __init orion_gpio_set_unused(unsigned pin)
{
/*
* Configure as output, drive low.
*/
/* Configure as output, drive low. */
__set_level(pin, 0);
__set_direction(pin, 0);
}
@ -230,21 +193,14 @@ void __init orion_gpio_set_valid(unsigned pin, int mode)
void orion_gpio_set_blink(unsigned pin, int blink)
{
unsigned long flags;
u32 u;
spin_lock_irqsave(&gpio_lock, flags);
/*
* Set output value to zero.
*/
/* Set output value to zero. */
__set_level(pin, 0);
u = readl(GPIO_BLINK_EN(pin));
if (blink)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_BLINK_EN(pin));
/* Set blinking. */
__set_blinking(pin, blink);
spin_unlock_irqrestore(&gpio_lock, flags);
}
@ -368,7 +324,7 @@ static int gpio_irq_set_type(u32 irq, u32 type)
}
struct irq_chip orion_gpio_irq_chip = {
.name = "orion_gpio",
.name = "orion_gpio_irq",
.ack = gpio_irq_ack,
.mask = gpio_irq_mask,
.unmask = gpio_irq_unmask,

17
arch/arm/plat-orion/include/plat/gpio.h
View File

@ -14,12 +14,9 @@
/*
* GENERIC_GPIO primitives.
*/
int gpio_request(unsigned pin, const char *label);
void gpio_free(unsigned pin);
int gpio_direction_input(unsigned pin);
int gpio_direction_output(unsigned pin, int value);
int gpio_get_value(unsigned pin);
void gpio_set_value(unsigned pin, int value);
#define gpio_get_value __gpio_get_value
#define gpio_set_value __gpio_set_value
#define gpio_cansleep __gpio_cansleep
/*
* Orion-specific GPIO API extensions.
@ -27,11 +24,13 @@ void gpio_set_value(unsigned pin, int value);
void orion_gpio_set_unused(unsigned pin);
void orion_gpio_set_blink(unsigned pin, int blink);
#define GPIO_BIDI_OK (1 << 0)
#define GPIO_INPUT_OK (1 << 1)
#define GPIO_OUTPUT_OK (1 << 2)
#define GPIO_INPUT_OK (1 << 0)
#define GPIO_OUTPUT_OK (1 << 1)
void orion_gpio_set_valid(unsigned pin, int mode);
/* Initialize gpiolib. */
void __init orion_gpio_init(void);
/*
* GPIO interrupt handling.
*/