control.c

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/*
 * i2sbus driver -- bus control routines
 *
 * Copyright 2006 Johannes Berg <[email protected]>
 *
 * GPL v2, can be found in COPYING.
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.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.dev.of_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;
}