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- #include <linux/spinlock.h>
-
- u32 scx200_gpio_configure(int index, u32 set, u32 clear);
- void scx200_gpio_dump(unsigned index);
-
- extern unsigned scx200_gpio_base;
- extern spinlock_t scx200_gpio_lock;
- extern long scx200_gpio_shadow[2];
-
- #define scx200_gpio_present() (scx200_gpio_base!=0)
-
- /* Definitions to make sure I do the same thing in all functions */
- #define __SCx200_GPIO_BANK unsigned bank = index>>5
- #define __SCx200_GPIO_IOADDR unsigned short ioaddr = scx200_gpio_base+0x10*bank
- #define __SCx200_GPIO_SHADOW long *shadow = scx200_gpio_shadow+bank
- #define __SCx200_GPIO_INDEX index &= 31
-
- #define __SCx200_GPIO_OUT __asm__ __volatile__("outsl":"=mS" (shadow):"d" (ioaddr), "0" (shadow))
-
- /* returns the value of the GPIO pin */
-
- static inline int scx200_gpio_get(int index) {
- __SCx200_GPIO_BANK;
- __SCx200_GPIO_IOADDR + 0x04;
- __SCx200_GPIO_INDEX;
-
- return (inl(ioaddr) & (1<<index)) ? 1 : 0;
- }
-
- /* return the value driven on the GPIO signal (the value that will be
- driven if the GPIO is configured as an output, it might not be the
- state of the GPIO right now if the GPIO is configured as an input) */
-
- static inline int scx200_gpio_current(int index) {
- __SCx200_GPIO_BANK;
- __SCx200_GPIO_INDEX;
-
- return (scx200_gpio_shadow[bank] & (1<<index)) ? 1 : 0;
- }
-
- /* drive the GPIO signal high */
-
- static inline void scx200_gpio_set_high(int index) {
- __SCx200_GPIO_BANK;
- __SCx200_GPIO_IOADDR;
- __SCx200_GPIO_SHADOW;
- __SCx200_GPIO_INDEX;
- set_bit(index, shadow);
- __SCx200_GPIO_OUT;
- }
-
- /* drive the GPIO signal low */
-
- static inline void scx200_gpio_set_low(int index) {
- __SCx200_GPIO_BANK;
- __SCx200_GPIO_IOADDR;
- __SCx200_GPIO_SHADOW;
- __SCx200_GPIO_INDEX;
- clear_bit(index, shadow);
- __SCx200_GPIO_OUT;
- }
-
- /* drive the GPIO signal to state */
-
- static inline void scx200_gpio_set(int index, int state) {
- __SCx200_GPIO_BANK;
- __SCx200_GPIO_IOADDR;
- __SCx200_GPIO_SHADOW;
- __SCx200_GPIO_INDEX;
- if (state)
- set_bit(index, shadow);
- else
- clear_bit(index, shadow);
- __SCx200_GPIO_OUT;
- }
-
- /* toggle the GPIO signal */
- static inline void scx200_gpio_change(int index) {
- __SCx200_GPIO_BANK;
- __SCx200_GPIO_IOADDR;
- __SCx200_GPIO_SHADOW;
- __SCx200_GPIO_INDEX;
- change_bit(index, shadow);
- __SCx200_GPIO_OUT;
- }
-
- #undef __SCx200_GPIO_BANK
- #undef __SCx200_GPIO_IOADDR
- #undef __SCx200_GPIO_SHADOW
- #undef __SCx200_GPIO_INDEX
- #undef __SCx200_GPIO_OUT
-
- /*
- Local variables:
- compile-command: "make -C ../.. bzImage modules"
- c-basic-offset: 8
- End:
- */
-