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@ -25,6 +25,7 @@
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#include <linux/io.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <asm/rdc321x_gpio.h>
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#include <asm/rdc321x_defs.h>
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@ -38,9 +39,6 @@ static DEFINE_SPINLOCK(gpio_lock);
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static u32 gpio_data_reg1;
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static u32 gpio_data_reg2;
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static u32 gpio_request_data[2];
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static inline void rdc321x_conf_write(unsigned addr, u32 value)
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{
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outl((1 << 31) | (7 << 11) | addr, RDC3210_CFGREG_ADDR);
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@ -73,63 +71,8 @@ static void rdc321x_configure_gpio(unsigned gpio)
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spin_unlock_irqrestore(&gpio_lock, flags);
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}
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/* initially setup the 2 copies of the gpio data registers.
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This function is called before the platform setup code. */
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static int __init rdc321x_gpio_setup(void)
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{
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/* this might not be, what others (BIOS, bootloader, etc.)
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wrote to these registers before, but it's a good guess. Still
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better than just using 0xffffffff. */
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gpio_data_reg1 = rdc321x_conf_read(RDC321X_GPIO_DATA_REG1);
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gpio_data_reg2 = rdc321x_conf_read(RDC321X_GPIO_DATA_REG2);
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return 0;
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}
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/* determine, if gpio number is valid */
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static inline int rdc321x_is_gpio(unsigned gpio)
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{
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return gpio <= RDC321X_MAX_GPIO;
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}
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/* request GPIO */
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int rdc_gpio_request(unsigned gpio, const char *label)
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{
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unsigned long flags;
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if (!rdc321x_is_gpio(gpio))
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return -EINVAL;
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spin_lock_irqsave(&gpio_lock, flags);
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if (gpio_request_data[(gpio & 0x20) ? 1 : 0] & (1 << (gpio & 0x1f)))
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goto inuse;
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gpio_request_data[(gpio & 0x20) ? 1 : 0] |= (1 << (gpio & 0x1f));
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spin_unlock_irqrestore(&gpio_lock, flags);
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return 0;
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inuse:
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spin_unlock_irqrestore(&gpio_lock, flags);
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return -EINVAL;
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}
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EXPORT_SYMBOL(rdc_gpio_request);
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/* release previously-claimed GPIO */
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void rdc_gpio_free(unsigned gpio)
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{
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unsigned long flags;
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if (!rdc321x_is_gpio(gpio))
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return;
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spin_lock_irqsave(&gpio_lock, flags);
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gpio_request_data[(gpio & 0x20) ? 1 : 0] &= ~(1 << (gpio & 0x1f));
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spin_unlock_irqrestore(&gpio_lock, flags);
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}
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EXPORT_SYMBOL(rdc_gpio_free);
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/* read GPIO pin */
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int rdc_gpio_get_value(unsigned gpio)
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static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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u32 reg;
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unsigned long flags;
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@ -141,10 +84,10 @@ int rdc_gpio_get_value(unsigned gpio)
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return (1 << (gpio & 0x1f)) & reg ? 1 : 0;
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}
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EXPORT_SYMBOL(rdc_gpio_get_value);
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/* set GPIO pin to value */
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void rdc_gpio_set_value(unsigned gpio, int value)
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static void rdc_gpio_set_value(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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unsigned long flags;
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u32 reg;
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@ -168,31 +111,48 @@ void rdc_gpio_set_value(unsigned gpio, int value)
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spin_unlock_irqrestore(&gpio_lock, flags);
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}
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}
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EXPORT_SYMBOL(rdc_gpio_set_value);
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/* configure GPIO pin as input */
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int rdc_gpio_direction_input(unsigned gpio)
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static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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if (!rdc321x_is_gpio(gpio))
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return -EINVAL;
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rdc321x_configure_gpio(gpio);
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return 0;
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}
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EXPORT_SYMBOL(rdc_gpio_direction_input);
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/* configure GPIO pin as output and set value */
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int rdc_gpio_direction_output(unsigned gpio, int value)
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static int rdc_gpio_direction_output(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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if (!rdc321x_is_gpio(gpio))
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return -EINVAL;
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gpio_set_value(gpio, value);
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rdc321x_configure_gpio(gpio);
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gpio_set_value(gpio, value);
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return 0;
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}
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EXPORT_SYMBOL(rdc_gpio_direction_output);
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static struct gpio_chip rdc321x_gpio_chip = {
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.label = "rdc321x-gpio",
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.direction_input = rdc_gpio_direction_input,
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.direction_output = rdc_gpio_direction_output,
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.get = rdc_gpio_get_value,
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.set = rdc_gpio_set_value,
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.base = 0,
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.ngpio = RDC321X_MAX_GPIO,
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};
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/* initially setup the 2 copies of the gpio data registers.
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This function is called before the platform setup code. */
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static int __init rdc321x_gpio_setup(void)
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{
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/* this might not be, what others (BIOS, bootloader, etc.)
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wrote to these registers before, but it's a good guess. Still
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better than just using 0xffffffff. */
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gpio_data_reg1 = rdc321x_conf_read(RDC321X_GPIO_DATA_REG1);
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gpio_data_reg2 = rdc321x_conf_read(RDC321X_GPIO_DATA_REG2);
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printk(KERN_INFO "rdc321x: registering %d GPIOs\n", rdc321x_gpio_chip.ngpio);
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return gpiochip_add(&rdc321x_gpio_chip);
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}
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arch_initcall(rdc321x_gpio_setup);
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