LXR linux/include/linux/scx200

   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