scx200_gpio.h revision 58012cd788443b9d144bd7c72260a84b6b30f45d 
1#include <linux/spinlock.h>
2
3u32 scx200_gpio_configure(unsigned index, u32 set, u32 clear);
4
5extern unsigned scx200_gpio_base;
6extern long scx200_gpio_shadow[2];
7extern struct nsc_gpio_ops scx200_gpio_ops;
8
9#define scx200_gpio_present() (scx200_gpio_base!=0)
10
11/* Definitions to make sure I do the same thing in all functions */
12#define __SCx200_GPIO_BANK unsigned bank = index>>5
13#define __SCx200_GPIO_IOADDR unsigned short ioaddr = scx200_gpio_base+0x10*bank
14#define __SCx200_GPIO_SHADOW long *shadow = scx200_gpio_shadow+bank
15#define __SCx200_GPIO_INDEX index &= 31
16
17#define __SCx200_GPIO_OUT __asm__ __volatile__("outsl":"=mS" (shadow):"d" (ioaddr), "0" (shadow))
18
19/* returns the value of the GPIO pin */
20
21static inline int scx200_gpio_get(unsigned index) {
22	__SCx200_GPIO_BANK;
23	__SCx200_GPIO_IOADDR + 0x04;
24	__SCx200_GPIO_INDEX;
25
26	return (inl(ioaddr) & (1<<index)) ? 1 : 0;
27}
28
29/* return the value driven on the GPIO signal (the value that will be
30   driven if the GPIO is configured as an output, it might not be the
31   state of the GPIO right now if the GPIO is configured as an input) */
32
33static inline int scx200_gpio_current(unsigned index) {
34        __SCx200_GPIO_BANK;
35	__SCx200_GPIO_INDEX;
36
37	return (scx200_gpio_shadow[bank] & (1<<index)) ? 1 : 0;
38}
39
40/* drive the GPIO signal high */
41
42static inline void scx200_gpio_set_high(unsigned index) {
43	__SCx200_GPIO_BANK;
44	__SCx200_GPIO_IOADDR;
45	__SCx200_GPIO_SHADOW;
46	__SCx200_GPIO_INDEX;
47	set_bit(index, shadow);
48	__SCx200_GPIO_OUT;
49}
50
51/* drive the GPIO signal low */
52
53static inline void scx200_gpio_set_low(unsigned index) {
54	__SCx200_GPIO_BANK;
55	__SCx200_GPIO_IOADDR;
56	__SCx200_GPIO_SHADOW;
57	__SCx200_GPIO_INDEX;
58	clear_bit(index, shadow);
59	__SCx200_GPIO_OUT;
60}
61
62/* drive the GPIO signal to state */
63
64static inline void scx200_gpio_set(unsigned index, int state) {
65	__SCx200_GPIO_BANK;
66	__SCx200_GPIO_IOADDR;
67	__SCx200_GPIO_SHADOW;
68	__SCx200_GPIO_INDEX;
69	if (state)
70		set_bit(index, shadow);
71	else
72		clear_bit(index, shadow);
73	__SCx200_GPIO_OUT;
74}
75
76/* toggle the GPIO signal */
77static inline void scx200_gpio_change(unsigned index) {
78	__SCx200_GPIO_BANK;
79	__SCx200_GPIO_IOADDR;
80	__SCx200_GPIO_SHADOW;
81	__SCx200_GPIO_INDEX;
82	change_bit(index, shadow);
83	__SCx200_GPIO_OUT;
84}
85
86#undef __SCx200_GPIO_BANK
87#undef __SCx200_GPIO_IOADDR
88#undef __SCx200_GPIO_SHADOW
89#undef __SCx200_GPIO_INDEX
90#undef __SCx200_GPIO_OUT
91