scx200_gpio.h revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 
1#include <linux/spinlock.h>
2
3u32 scx200_gpio_configure(int index, u32 set, u32 clear);
4
5extern unsigned scx200_gpio_base;
6extern long scx200_gpio_shadow[2];
7
8#define scx200_gpio_present() (scx200_gpio_base!=0)
9
10/* Definitions to make sure I do the same thing in all functions */
11#define __SCx200_GPIO_BANK unsigned bank = index>>5
12#define __SCx200_GPIO_IOADDR unsigned short ioaddr = scx200_gpio_base+0x10*bank
13#define __SCx200_GPIO_SHADOW long *shadow = scx200_gpio_shadow+bank
14#define __SCx200_GPIO_INDEX index &= 31
15
16#define __SCx200_GPIO_OUT __asm__ __volatile__("outsl":"=mS" (shadow):"d" (ioaddr), "0" (shadow))
17
18/* returns the value of the GPIO pin */
19
20static inline int scx200_gpio_get(int index) {
21	__SCx200_GPIO_BANK;
22	__SCx200_GPIO_IOADDR + 0x04;
23	__SCx200_GPIO_INDEX;
24
25	return (inl(ioaddr) & (1<<index)) ? 1 : 0;
26}
27
28/* return the value driven on the GPIO signal (the value that will be
29   driven if the GPIO is configured as an output, it might not be the
30   state of the GPIO right now if the GPIO is configured as an input) */
31
32static inline int scx200_gpio_current(int index) {
33        __SCx200_GPIO_BANK;
34	__SCx200_GPIO_INDEX;
35
36	return (scx200_gpio_shadow[bank] & (1<<index)) ? 1 : 0;
37}
38
39/* drive the GPIO signal high */
40
41static inline void scx200_gpio_set_high(int index) {
42	__SCx200_GPIO_BANK;
43	__SCx200_GPIO_IOADDR;
44	__SCx200_GPIO_SHADOW;
45	__SCx200_GPIO_INDEX;
46	set_bit(index, shadow);
47	__SCx200_GPIO_OUT;
48}
49
50/* drive the GPIO signal low */
51
52static inline void scx200_gpio_set_low(int index) {
53	__SCx200_GPIO_BANK;
54	__SCx200_GPIO_IOADDR;
55	__SCx200_GPIO_SHADOW;
56	__SCx200_GPIO_INDEX;
57	clear_bit(index, shadow);
58	__SCx200_GPIO_OUT;
59}
60
61/* drive the GPIO signal to state */
62
63static inline void scx200_gpio_set(int index, int state) {
64	__SCx200_GPIO_BANK;
65	__SCx200_GPIO_IOADDR;
66	__SCx200_GPIO_SHADOW;
67	__SCx200_GPIO_INDEX;
68	if (state)
69		set_bit(index, shadow);
70	else
71		clear_bit(index, shadow);
72	__SCx200_GPIO_OUT;
73}
74
75/* toggle the GPIO signal */
76static inline void scx200_gpio_change(int index) {
77	__SCx200_GPIO_BANK;
78	__SCx200_GPIO_IOADDR;
79	__SCx200_GPIO_SHADOW;
80	__SCx200_GPIO_INDEX;
81	change_bit(index, shadow);
82	__SCx200_GPIO_OUT;
83}
84
85#undef __SCx200_GPIO_BANK
86#undef __SCx200_GPIO_IOADDR
87#undef __SCx200_GPIO_SHADOW
88#undef __SCx200_GPIO_INDEX
89#undef __SCx200_GPIO_OUT
90
91/*
92    Local variables:
93        compile-command: "make -C ../.. bzImage modules"
94        c-basic-offset: 8
95    End:
96*/
97