| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |