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