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mfp.c

/*
 * linux/arch/arm/mach-w90x900/mfp.c
 *
 * Copyright (c) 2008 Nuvoton technology corporation
 *
 * Wan ZongShun <mcuos.com@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation;version 2 of the License.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/io.h>

#include <mach/hardware.h>

#define REG_MFSEL (W90X900_VA_GCR + 0xC)

#define GPSELF          (0x01 << 1)

#define GPSELC          (0x03 << 2)
#define ENKPI           (0x02 << 2)
#define ENNAND          (0x01 << 2)

#define GPSELEI0  (0x01 << 26)
#define GPSELEI1  (0x01 << 27)

#define GPIOG0TO1 (0x03 << 14)
#define GPIOG2TO3 (0x03 << 16)
#define GPIOG22TO23     (0x03 << 22)

#define ENSPI           (0x0a << 14)
#define ENI2C0          (0x01 << 14)
#define ENI2C1          (0x01 << 16)
#define ENAC97          (0x02 << 22)

static DEFINE_MUTEX(mfp_mutex);

void mfp_set_groupf(struct device *dev)
{
      unsigned long mfpen;
      const char *dev_id;

      BUG_ON(!dev);

      mutex_lock(&mfp_mutex);

      dev_id = dev_name(dev);

      mfpen = __raw_readl(REG_MFSEL);

      if (strcmp(dev_id, "nuc900-emc") == 0)
            mfpen |= GPSELF;/*enable mac*/
      else
            mfpen &= ~GPSELF;/*GPIOF[9:0]*/

      __raw_writel(mfpen, REG_MFSEL);

      mutex_unlock(&mfp_mutex);
}
EXPORT_SYMBOL(mfp_set_groupf);

void mfp_set_groupc(struct device *dev)
{
      unsigned long mfpen;
      const char *dev_id;

      BUG_ON(!dev);

      mutex_lock(&mfp_mutex);

      dev_id = dev_name(dev);

      mfpen = __raw_readl(REG_MFSEL);

      if (strcmp(dev_id, "nuc900-lcd") == 0)
            mfpen |= GPSELC;/*enable lcd*/
      else if (strcmp(dev_id, "nuc900-kpi") == 0) {
            mfpen &= (~GPSELC);/*enable kpi*/
            mfpen |= ENKPI;
      } else if (strcmp(dev_id, "nuc900-nand") == 0) {
            mfpen &= (~GPSELC);/*enable nand*/
            mfpen |= ENNAND;
      } else
            mfpen &= (~GPSELC);/*GPIOC[14:0]*/

      __raw_writel(mfpen, REG_MFSEL);

      mutex_unlock(&mfp_mutex);
}
EXPORT_SYMBOL(mfp_set_groupc);

void mfp_set_groupi(struct device *dev)
{
      unsigned long mfpen;
      const char *dev_id;

      BUG_ON(!dev);

      mutex_lock(&mfp_mutex);

      dev_id = dev_name(dev);

      mfpen = __raw_readl(REG_MFSEL);

      mfpen &= ~GPSELEI1;/*default gpio16*/

      if (strcmp(dev_id, "nuc900-wdog") == 0)
            mfpen |= GPSELEI1;/*enable wdog*/
      else if (strcmp(dev_id, "nuc900-atapi") == 0)
            mfpen |= GPSELEI0;/*enable atapi*/
      else if (strcmp(dev_id, "nuc900-keypad") == 0)
            mfpen &= ~GPSELEI0;/*enable keypad*/

      __raw_writel(mfpen, REG_MFSEL);

      mutex_unlock(&mfp_mutex);
}
EXPORT_SYMBOL(mfp_set_groupi);

void mfp_set_groupg(struct device *dev)
{
      unsigned long mfpen;
      const char *dev_id;

      BUG_ON(!dev);

      mutex_lock(&mfp_mutex);

      dev_id = dev_name(dev);

      mfpen = __raw_readl(REG_MFSEL);

      if (strcmp(dev_id, "nuc900-spi") == 0) {
            mfpen &= ~(GPIOG0TO1 | GPIOG2TO3);
            mfpen |= ENSPI;/*enable spi*/
      } else if (strcmp(dev_id, "nuc900-i2c0") == 0) {
            mfpen &= ~(GPIOG0TO1);
            mfpen |= ENI2C0;/*enable i2c0*/
      } else if (strcmp(dev_id, "nuc900-i2c1") == 0) {
            mfpen &= ~(GPIOG2TO3);
            mfpen |= ENI2C1;/*enable i2c1*/
      } else if (strcmp(dev_id, "nuc900-audio") == 0) {
            mfpen &= ~(GPIOG22TO23);
            mfpen |= ENAC97;/*enable AC97*/
      } else {
            mfpen &= ~(GPIOG0TO1 | GPIOG2TO3);/*GPIOG[3:0]*/
      }

      __raw_writel(mfpen, REG_MFSEL);

      mutex_unlock(&mfp_mutex);
}
EXPORT_SYMBOL(mfp_set_groupg);


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