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1da177e4 LT |
1 | #include <linux/spinlock.h> |
2 | ||
3 | u32 scx200_gpio_configure(int index, u32 set, u32 clear); | |
4 | ||
5 | extern unsigned scx200_gpio_base; | |
6 | extern 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 | ||
20 | static 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 | ||
32 | static 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 | ||
41 | static 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 | ||
52 | static 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 | ||
63 | static 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 */ | |
76 | static 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 | */ |