| /* |
| * arch/arm/mach-orion5x/gpio.c |
| * |
| * GPIO functions for Marvell Orion System On Chip |
| * |
| * Maintainer: Tzachi Perelstein <tzachi@marvell.com> |
| * |
| * This file is licensed under the terms of the GNU General Public |
| * License version 2. This program is licensed "as is" without any |
| * warranty of any kind, whether express or implied. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/spinlock.h> |
| #include <linux/bitops.h> |
| #include <asm/gpio.h> |
| #include <asm/io.h> |
| #include <asm/arch/orion5x.h> |
| #include "common.h" |
| |
| static DEFINE_SPINLOCK(gpio_lock); |
| static unsigned long gpio_valid[BITS_TO_LONGS(GPIO_MAX)]; |
| static const char *gpio_label[GPIO_MAX]; /* non null for allocated GPIOs */ |
| |
| void __init orion5x_gpio_set_valid(unsigned pin, int valid) |
| { |
| if (valid) |
| __set_bit(pin, gpio_valid); |
| else |
| __clear_bit(pin, gpio_valid); |
| } |
| |
| /* |
| * GENERIC_GPIO primitives |
| */ |
| int gpio_direction_input(unsigned pin) |
| { |
| unsigned long flags; |
| |
| if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) { |
| pr_debug("%s: invalid GPIO %d\n", __func__, pin); |
| return -EINVAL; |
| } |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| /* |
| * Some callers might have not used the gpio_request(), |
| * so flag this pin as requested now. |
| */ |
| if (!gpio_label[pin]) |
| gpio_label[pin] = "?"; |
| |
| orion5x_setbits(GPIO_IO_CONF, 1 << pin); |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| return 0; |
| } |
| EXPORT_SYMBOL(gpio_direction_input); |
| |
| int gpio_direction_output(unsigned pin, int value) |
| { |
| unsigned long flags; |
| int mask; |
| |
| if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) { |
| pr_debug("%s: invalid GPIO %d\n", __func__, pin); |
| return -EINVAL; |
| } |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| /* |
| * Some callers might have not used the gpio_request(), |
| * so flag this pin as requested now. |
| */ |
| if (!gpio_label[pin]) |
| gpio_label[pin] = "?"; |
| |
| mask = 1 << pin; |
| orion5x_clrbits(GPIO_BLINK_EN, mask); |
| if (value) |
| orion5x_setbits(GPIO_OUT, mask); |
| else |
| orion5x_clrbits(GPIO_OUT, mask); |
| orion5x_clrbits(GPIO_IO_CONF, mask); |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| return 0; |
| } |
| EXPORT_SYMBOL(gpio_direction_output); |
| |
| int gpio_get_value(unsigned pin) |
| { |
| int val, mask = 1 << pin; |
| |
| if (orion5x_read(GPIO_IO_CONF) & mask) |
| val = orion5x_read(GPIO_DATA_IN) ^ orion5x_read(GPIO_IN_POL); |
| else |
| val = orion5x_read(GPIO_OUT); |
| |
| return val & mask; |
| } |
| EXPORT_SYMBOL(gpio_get_value); |
| |
| void gpio_set_value(unsigned pin, int value) |
| { |
| unsigned long flags; |
| int mask = 1 << pin; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| orion5x_clrbits(GPIO_BLINK_EN, mask); |
| if (value) |
| orion5x_setbits(GPIO_OUT, mask); |
| else |
| orion5x_clrbits(GPIO_OUT, mask); |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| } |
| EXPORT_SYMBOL(gpio_set_value); |
| |
| void orion5x_gpio_set_blink(unsigned pin, int blink) |
| { |
| unsigned long flags; |
| int mask = 1 << pin; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| orion5x_clrbits(GPIO_OUT, mask); |
| if (blink) |
| orion5x_setbits(GPIO_BLINK_EN, mask); |
| else |
| orion5x_clrbits(GPIO_BLINK_EN, mask); |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| } |
| EXPORT_SYMBOL(orion5x_gpio_set_blink); |
| |
| int gpio_request(unsigned pin, const char *label) |
| { |
| int ret = 0; |
| unsigned long flags; |
| |
| if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) { |
| pr_debug("%s: invalid GPIO %d\n", __func__, pin); |
| return -EINVAL; |
| } |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| if (gpio_label[pin]) { |
| pr_debug("%s: GPIO %d already used as %s\n", |
| __func__, pin, gpio_label[pin]); |
| ret = -EBUSY; |
| } else |
| gpio_label[pin] = label ? label : "?"; |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| return ret; |
| } |
| EXPORT_SYMBOL(gpio_request); |
| |
| void gpio_free(unsigned pin) |
| { |
| if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) { |
| pr_debug("%s: invalid GPIO %d\n", __func__, pin); |
| return; |
| } |
| |
| if (!gpio_label[pin]) |
| pr_warning("%s: GPIO %d already freed\n", __func__, pin); |
| else |
| gpio_label[pin] = NULL; |
| } |
| EXPORT_SYMBOL(gpio_free); |
| |
| /* Debug helper */ |
| void gpio_display(void) |
| { |
| int i; |
| |
| for (i = 0; i < GPIO_MAX; i++) { |
| printk(KERN_DEBUG "Pin-%d: ", i); |
| |
| if (!test_bit(i, gpio_valid)) { |
| printk("non-GPIO\n"); |
| } else if (!gpio_label[i]) { |
| printk("GPIO, free\n"); |
| } else { |
| printk("GPIO, used by %s, ", gpio_label[i]); |
| if (orion5x_read(GPIO_IO_CONF) & (1 << i)) { |
| printk("input, active %s, level %s, edge %s\n", |
| ((orion5x_read(GPIO_IN_POL) >> i) & 1) ? "low" : "high", |
| ((orion5x_read(GPIO_LEVEL_MASK) >> i) & 1) ? "enabled" : "masked", |
| ((orion5x_read(GPIO_EDGE_MASK) >> i) & 1) ? "enabled" : "masked"); |
| } else { |
| printk("output, val=%d\n", (orion5x_read(GPIO_OUT) >> i) & 1); |
| } |
| } |
| } |
| |
| printk(KERN_DEBUG "MPP_0_7_CTRL (0x%08x) = 0x%08x\n", |
| MPP_0_7_CTRL, orion5x_read(MPP_0_7_CTRL)); |
| printk(KERN_DEBUG "MPP_8_15_CTRL (0x%08x) = 0x%08x\n", |
| MPP_8_15_CTRL, orion5x_read(MPP_8_15_CTRL)); |
| printk(KERN_DEBUG "MPP_16_19_CTRL (0x%08x) = 0x%08x\n", |
| MPP_16_19_CTRL, orion5x_read(MPP_16_19_CTRL)); |
| printk(KERN_DEBUG "MPP_DEV_CTRL (0x%08x) = 0x%08x\n", |
| MPP_DEV_CTRL, orion5x_read(MPP_DEV_CTRL)); |
| printk(KERN_DEBUG "GPIO_OUT (0x%08x) = 0x%08x\n", |
| GPIO_OUT, orion5x_read(GPIO_OUT)); |
| printk(KERN_DEBUG "GPIO_IO_CONF (0x%08x) = 0x%08x\n", |
| GPIO_IO_CONF, orion5x_read(GPIO_IO_CONF)); |
| printk(KERN_DEBUG "GPIO_BLINK_EN (0x%08x) = 0x%08x\n", |
| GPIO_BLINK_EN, orion5x_read(GPIO_BLINK_EN)); |
| printk(KERN_DEBUG "GPIO_IN_POL (0x%08x) = 0x%08x\n", |
| GPIO_IN_POL, orion5x_read(GPIO_IN_POL)); |
| printk(KERN_DEBUG "GPIO_DATA_IN (0x%08x) = 0x%08x\n", |
| GPIO_DATA_IN, orion5x_read(GPIO_DATA_IN)); |
| printk(KERN_DEBUG "GPIO_LEVEL_MASK (0x%08x) = 0x%08x\n", |
| GPIO_LEVEL_MASK, orion5x_read(GPIO_LEVEL_MASK)); |
| printk(KERN_DEBUG "GPIO_EDGE_CAUSE (0x%08x) = 0x%08x\n", |
| GPIO_EDGE_CAUSE, orion5x_read(GPIO_EDGE_CAUSE)); |
| printk(KERN_DEBUG "GPIO_EDGE_MASK (0x%08x) = 0x%08x\n", |
| GPIO_EDGE_MASK, orion5x_read(GPIO_EDGE_MASK)); |
| } |