target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-gpio.c

   1
   2 #include <linux/kernel.h>
   3 #include <linux/module.h>
   4 #include <linux/spinlock.h>
   5 #include <linux/io.h>
   6
   7 #include <linux/glamo-gpio.h>
   8
   9 #include "glamo-core.h"
  10 #include "glamo-regs.h"
  11
  12 void glamo_gpio_setpin(struct glamo_core *glamo, unsigned int pin,
  13                        unsigned int value)
  14 {
  15         unsigned int reg = REG_OF_GPIO(pin);
  16         u_int16_t tmp;
  17
  18         spin_lock(&glamo->lock);
  19         tmp = readw(glamo->base + reg);
  20         if (value)
  21                 tmp |= OUTPUT_BIT(pin);
  22         else
  23                 tmp &= ~OUTPUT_BIT(pin);
  24         writew(tmp, glamo->base + reg);
  25         spin_unlock(&glamo->lock);
  26 }
  27 EXPORT_SYMBOL(glamo_gpio_setpin);
  28
  29 int glamo_gpio_getpin(struct glamo_core *glamo, unsigned int pin)
  30 {
  31         return readw(REG_OF_GPIO(pin)) & INPUT_BIT(pin) ? 1 : 0;
  32 }
  33 EXPORT_SYMBOL(glamo_gpio_getpin);
  34
  35 void glamo_gpio_cfgpin(struct glamo_core *glamo, unsigned int pinfunc)
  36 {
  37         unsigned int reg = REG_OF_GPIO(pinfunc);
  38         u_int16_t tmp;
  39
  40         spin_lock(&glamo->lock);
  41         tmp = readw(glamo->base + reg);
  42
  43         if ((pinfunc & 0x00f0) == GLAMO_GPIO_F_FUNC) {
  44                 /* pin is a function pin: clear gpio bit */
  45                 tmp &= ~FUNC_BIT(pinfunc);
  46         } else {
  47                 /* pin is gpio: set gpio bit */
  48                 tmp |= FUNC_BIT(pinfunc);
  49
  50                 if (pinfunc & GLAMO_GPIO_F_IN) {
  51                         /* gpio input: set bit to disable output mode */
  52                         tmp |= GPIO_OUT_BIT(pinfunc);
  53                 } else if (pinfunc & GLAMO_GPIO_F_OUT) {
  54                         /* gpio output: clear bit to enable output mode */
  55                         tmp &= ~GPIO_OUT_BIT(pinfunc);
  56                 }
  57         }
  58         writew(tmp, glamo->base + reg);
  59         spin_unlock(&glamo->lock);
  60 }
  61 EXPORT_SYMBOL(glamo_gpio_cfgpin);
  62