| 1 | #include <asm/types.h> |
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| 2 | |
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| 3 | |
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| 4 | __u32 scx200_gpio_configure(int index, __u32 set, __u32 clear); |
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| 5 | |
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| 6 | extern unsigned scx200_gpio_base; |
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| 7 | extern long scx200_gpio_shadow[2]; |
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| 8 | |
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| 9 | #define scx200_gpio_present() (scx200_gpio_base!=0) |
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| 10 | |
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| 11 | /* Definitions to make sure I do the same thing in all functions */ |
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| 12 | #define __SCx200_GPIO_BANK unsigned bank = index>>5 |
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| 13 | #define __SCx200_GPIO_IOADDR unsigned short ioaddr = scx200_gpio_base+0x10*bank |
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| 14 | #define __SCx200_GPIO_SHADOW long *shadow = scx200_gpio_shadow+bank |
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| 15 | #define __SCx200_GPIO_INDEX index &= 31 |
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| 16 | |
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| 17 | #define __SCx200_GPIO_OUT __asm__ __volatile__("outsl":"=mS" (shadow):"d" (ioaddr), "0" (shadow)) |
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| 18 | |
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| 19 | /* returns the value of the GPIO pin */ |
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| 20 | |
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| 21 | static inline int scx200_gpio_get(int index) { |
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| 22 | __SCx200_GPIO_BANK; |
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| 23 | __SCx200_GPIO_IOADDR + 0x04; |
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| 24 | __SCx200_GPIO_INDEX; |
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| 25 | |
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| 26 | return (inl(ioaddr) & (1<<index)) ? 1 : 0; |
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| 27 | } |
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| 28 | |
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| 29 | /* return the value driven on the GPIO signal (the value that will be |
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| 30 | driven if the GPIO is configured as an output, it might not be the |
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| 31 | state of the GPIO right now if the GPIO is configured as an input) */ |
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| 32 | |
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| 33 | static inline int scx200_gpio_current(int index) { |
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| 34 | __SCx200_GPIO_BANK; |
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| 35 | __SCx200_GPIO_INDEX; |
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| 36 | |
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| 37 | return (scx200_gpio_shadow[bank] & (1<<index)) ? 1 : 0; |
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| 38 | } |
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| 39 | |
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| 40 | /* drive the GPIO signal high */ |
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| 41 | |
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| 42 | static inline void scx200_gpio_set_high(int index) { |
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| 43 | __SCx200_GPIO_BANK; |
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| 44 | __SCx200_GPIO_IOADDR; |
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| 45 | __SCx200_GPIO_SHADOW; |
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| 46 | __SCx200_GPIO_INDEX; |
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| 47 | set_bit(index, shadow); |
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| 48 | __SCx200_GPIO_OUT; |
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| 49 | } |
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| 50 | |
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| 51 | /* drive the GPIO signal low */ |
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| 52 | |
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| 53 | static inline void scx200_gpio_set_low(int index) { |
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| 54 | __SCx200_GPIO_BANK; |
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| 55 | __SCx200_GPIO_IOADDR; |
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| 56 | __SCx200_GPIO_SHADOW; |
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| 57 | __SCx200_GPIO_INDEX; |
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| 58 | clear_bit(index, shadow); |
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| 59 | __SCx200_GPIO_OUT; |
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| 60 | } |
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| 61 | |
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| 62 | /* drive the GPIO signal to state */ |
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| 63 | |
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| 64 | static inline void scx200_gpio_set(int index, int state) { |
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| 65 | __SCx200_GPIO_BANK; |
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| 66 | __SCx200_GPIO_IOADDR; |
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| 67 | __SCx200_GPIO_SHADOW; |
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| 68 | __SCx200_GPIO_INDEX; |
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| 69 | if (state) |
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| 70 | set_bit(index, shadow); |
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| 71 | else |
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| 72 | clear_bit(index, shadow); |
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| 73 | __SCx200_GPIO_OUT; |
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| 74 | } |
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| 75 | |
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| 76 | /* toggle the GPIO signal */ |
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| 77 | static inline void scx200_gpio_change(int index) { |
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| 78 | __SCx200_GPIO_BANK; |
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| 79 | __SCx200_GPIO_IOADDR; |
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| 80 | __SCx200_GPIO_SHADOW; |
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| 81 | __SCx200_GPIO_INDEX; |
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| 82 | change_bit(index, shadow); |
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| 83 | __SCx200_GPIO_OUT; |
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| 84 | } |
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| 85 | |
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| 86 | #undef __SCx200_GPIO_BANK |
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| 87 | #undef __SCx200_GPIO_IOADDR |
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| 88 | #undef __SCx200_GPIO_SHADOW |
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| 89 | #undef __SCx200_GPIO_INDEX |
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| 90 | #undef __SCx200_GPIO_OUT |
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| 91 | |
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| 92 | /* |
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| 93 | Local variables: |
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| 94 | compile-command: "make -C ../.. bzImage modules" |
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| 95 | c-basic-offset: 8 |
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| 96 | End: |
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| 97 | */ |
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