scx200_gpio.h revision 0a3021f4e249fbdb5f30d614707b5e02022e4c9b 
1u32 scx200_gpio_configure(unsigned index, u32 set, u32 clear);
2
3extern unsigned scx200_gpio_base;
4extern long scx200_gpio_shadow[2];
5extern struct nsc_gpio_ops scx200_gpio_ops;
6
7#define scx200_gpio_present() (scx200_gpio_base!=0)
8
9/* Definitions to make sure I do the same thing in all functions */
10#define __SCx200_GPIO_BANK unsigned bank = index>>5
11#define __SCx200_GPIO_IOADDR unsigned short ioaddr = scx200_gpio_base+0x10*bank
12#define __SCx200_GPIO_SHADOW long *shadow = scx200_gpio_shadow+bank
13#define __SCx200_GPIO_INDEX index &= 31
14
15#define __SCx200_GPIO_OUT __asm__ __volatile__("outsl":"=mS" (shadow):"d" (ioaddr), "0" (shadow))
16
17/* returns the value of the GPIO pin */
18
19static inline int scx200_gpio_get(unsigned index) {
20	__SCx200_GPIO_BANK;
21	__SCx200_GPIO_IOADDR + 0x04;
22	__SCx200_GPIO_INDEX;
23
24	return (inl(ioaddr) & (1<<index)) ? 1 : 0;
25}
26
27/* return the value driven on the GPIO signal (the value that will be
28   driven if the GPIO is configured as an output, it might not be the
29   state of the GPIO right now if the GPIO is configured as an input) */
30
31static inline int scx200_gpio_current(unsigned index) {
32        __SCx200_GPIO_BANK;
33	__SCx200_GPIO_INDEX;
34
35	return (scx200_gpio_shadow[bank] & (1<<index)) ? 1 : 0;
36}
37
38/* drive the GPIO signal high */
39
40static inline void scx200_gpio_set_high(unsigned index) {
41	__SCx200_GPIO_BANK;
42	__SCx200_GPIO_IOADDR;
43	__SCx200_GPIO_SHADOW;
44	__SCx200_GPIO_INDEX;
45	set_bit(index, shadow);
46	__SCx200_GPIO_OUT;
47}
48
49/* drive the GPIO signal low */
50
51static inline void scx200_gpio_set_low(unsigned index) {
52	__SCx200_GPIO_BANK;
53	__SCx200_GPIO_IOADDR;
54	__SCx200_GPIO_SHADOW;
55	__SCx200_GPIO_INDEX;
56	clear_bit(index, shadow);
57	__SCx200_GPIO_OUT;
58}
59
60/* drive the GPIO signal to state */
61
62static inline void scx200_gpio_set(unsigned index, int state) {
63	__SCx200_GPIO_BANK;
64	__SCx200_GPIO_IOADDR;
65	__SCx200_GPIO_SHADOW;
66	__SCx200_GPIO_INDEX;
67	if (state)
68		set_bit(index, shadow);
69	else
70		clear_bit(index, shadow);
71	__SCx200_GPIO_OUT;
72}
73
74/* toggle the GPIO signal */
75static inline void scx200_gpio_change(unsigned index) {
76	__SCx200_GPIO_BANK;
77	__SCx200_GPIO_IOADDR;
78	__SCx200_GPIO_SHADOW;
79	__SCx200_GPIO_INDEX;
80	change_bit(index, shadow);
81	__SCx200_GPIO_OUT;
82}
83
84#undef __SCx200_GPIO_BANK
85#undef __SCx200_GPIO_IOADDR
86#undef __SCx200_GPIO_SHADOW
87#undef __SCx200_GPIO_INDEX
88#undef __SCx200_GPIO_OUT
89