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control.c

/*
 * i2sbus driver -- bus control routines
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */

#include <linux/kernel.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <asm/prom.h>
#include <asm/macio.h>
#include <asm/pmac_feature.h>
#include <asm/pmac_pfunc.h>
#include <asm/keylargo.h>

#include "i2sbus.h"

int i2sbus_control_init(struct macio_dev* dev, struct i2sbus_control **c)
{
      *c = kzalloc(sizeof(struct i2sbus_control), GFP_KERNEL);
      if (!*c)
            return -ENOMEM;

      INIT_LIST_HEAD(&(*c)->list);

      (*c)->macio = dev->bus->chip;
      return 0;
}

void i2sbus_control_destroy(struct i2sbus_control *c)
{
      kfree(c);
}

/* this is serialised externally */
int i2sbus_control_add_dev(struct i2sbus_control *c,
                     struct i2sbus_dev *i2sdev)
{
      struct device_node *np;

      np = i2sdev->sound.ofdev.node;
      i2sdev->enable = pmf_find_function(np, "enable");
      i2sdev->cell_enable = pmf_find_function(np, "cell-enable");
      i2sdev->clock_enable = pmf_find_function(np, "clock-enable");
      i2sdev->cell_disable = pmf_find_function(np, "cell-disable");
      i2sdev->clock_disable = pmf_find_function(np, "clock-disable");

      /* if the bus number is not 0 or 1 we absolutely need to use
       * the platform functions -- there's nothing in Darwin that
       * would allow seeing a system behind what the FCRs are then,
       * and I don't want to go parsing a bunch of platform functions
       * by hand to try finding a system... */
      if (i2sdev->bus_number != 0 && i2sdev->bus_number != 1 &&
          (!i2sdev->enable ||
           !i2sdev->cell_enable || !i2sdev->clock_enable ||
           !i2sdev->cell_disable || !i2sdev->clock_disable)) {
            pmf_put_function(i2sdev->enable);
            pmf_put_function(i2sdev->cell_enable);
            pmf_put_function(i2sdev->clock_enable);
            pmf_put_function(i2sdev->cell_disable);
            pmf_put_function(i2sdev->clock_disable);
            return -ENODEV;
      }

      list_add(&i2sdev->item, &c->list);

      return 0;
}

void i2sbus_control_remove_dev(struct i2sbus_control *c,
                         struct i2sbus_dev *i2sdev)
{
      /* this is serialised externally */
      list_del(&i2sdev->item);
      if (list_empty(&c->list))
            i2sbus_control_destroy(c);
}

int i2sbus_control_enable(struct i2sbus_control *c,
                    struct i2sbus_dev *i2sdev)
{
      struct pmf_args args = { .count = 0 };
      struct macio_chip *macio = c->macio;

      if (i2sdev->enable)
            return pmf_call_one(i2sdev->enable, &args);

      if (macio == NULL || macio->base == NULL)
            return -ENODEV;

      switch (i2sdev->bus_number) {
      case 0:
            /* these need to be locked or done through
             * newly created feature calls! */
            MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
            break;
      case 1:
            MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_ENABLE);
            break;
      default:
            return -ENODEV;
      }
      return 0;
}

int i2sbus_control_cell(struct i2sbus_control *c,
                  struct i2sbus_dev *i2sdev,
                  int enable)
{
      struct pmf_args args = { .count = 0 };
      struct macio_chip *macio = c->macio;

      switch (enable) {
      case 0:
            if (i2sdev->cell_disable)
                  return pmf_call_one(i2sdev->cell_disable, &args);
            break;
      case 1:
            if (i2sdev->cell_enable)
                  return pmf_call_one(i2sdev->cell_enable, &args);
            break;
      default:
            printk(KERN_ERR "i2sbus: INVALID CELL ENABLE VALUE\n");
            return -ENODEV;
      }

      if (macio == NULL || macio->base == NULL)
            return -ENODEV;

      switch (i2sdev->bus_number) {
      case 0:
            if (enable)
                  MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
            else
                  MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
            break;
      case 1:
            if (enable)
                  MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
            else
                  MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
            break;
      default:
            return -ENODEV;
      }
      return 0;
}

int i2sbus_control_clock(struct i2sbus_control *c,
                   struct i2sbus_dev *i2sdev,
                   int enable)
{
      struct pmf_args args = { .count = 0 };
      struct macio_chip *macio = c->macio;

      switch (enable) {
      case 0:
            if (i2sdev->clock_disable)
                  return pmf_call_one(i2sdev->clock_disable, &args);
            break;
      case 1:
            if (i2sdev->clock_enable)
                  return pmf_call_one(i2sdev->clock_enable, &args);
            break;
      default:
            printk(KERN_ERR "i2sbus: INVALID CLOCK ENABLE VALUE\n");
            return -ENODEV;
      }

      if (macio == NULL || macio->base == NULL)
            return -ENODEV;

      switch (i2sdev->bus_number) {
      case 0:
            if (enable)
                  MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
            else
                  MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
            break;
      case 1:
            if (enable)
                  MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
            else
                  MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
            break;
      default:
            return -ENODEV;
      }
      return 0;
}

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