mcbsp.c

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/*
 * linux/arch/arm/mach-omap2/mcbsp.c
 *
 * Copyright (C) 2008 Instituto Nokia de Tecnologia
 * Contact: Eduardo Valentin <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Multichannel mode not supported.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/platform_data/asoc-ti-mcbsp.h>

#include <plat/dma.h>
#include <plat/omap_device.h>
#include <linux/pm_runtime.h>

/*
 * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
 * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
 */
#include "cm2xxx_3xxx.h"
#include "cm-regbits-34xx.h"

static int omap3_enable_st_clock(unsigned int id, bool enable)
{
    unsigned int w;

    /*
     * Sidetone uses McBSP ICLK - which must not idle when sidetones
     * are enabled or sidetones start sounding ugly.
     */
    w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
    if (enable)
        w &= ~(1 << (id - 2));
    else
        w |= 1 << (id - 2);
    omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);

    return 0;
}

static int __init omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
{
    int id, count = 1;
    char *name = "omap-mcbsp";
    struct omap_hwmod *oh_device[2];
    struct omap_mcbsp_platform_data *pdata = NULL;
    struct platform_device *pdev;

    sscanf(oh->name, "mcbsp%d", &id);

    pdata = kzalloc(sizeof(struct omap_mcbsp_platform_data), GFP_KERNEL);
    if (!pdata) {
        pr_err("%s: No memory for mcbsp\n", __func__);
        return -ENOMEM;
    }

    pdata->reg_step = 4;
    if (oh->class->rev < MCBSP_CONFIG_TYPE2) {
        pdata->reg_size = 2;
    } else {
        pdata->reg_size = 4;
        pdata->has_ccr = true;
    }

    if (oh->class->rev == MCBSP_CONFIG_TYPE2) {
        /* The FIFO has 128 locations */
        pdata->buffer_size = 0x80;
    } else if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
        if (id == 2)
            /* The FIFO has 1024 + 256 locations */
            pdata->buffer_size = 0x500;
        else
            /* The FIFO has 128 locations */
            pdata->buffer_size = 0x80;
    } else if (oh->class->rev == MCBSP_CONFIG_TYPE4) {
        /* The FIFO has 128 locations for all instances */
        pdata->buffer_size = 0x80;
    }

    if (oh->class->rev >= MCBSP_CONFIG_TYPE3)
        pdata->has_wakeup = true;

    oh_device[0] = oh;

    if (oh->dev_attr) {
        oh_device[1] = omap_hwmod_lookup((
        (struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
        pdata->enable_st_clock = omap3_enable_st_clock;
        count++;
    }
    pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
                sizeof(*pdata), NULL, 0, false);
    kfree(pdata);
    if (IS_ERR(pdev))  {
        pr_err("%s: Can't build omap_device for %s:%s.\n", __func__,
                    name, oh->name);
        return PTR_ERR(pdev);
    }
    return 0;
}

static int __init omap2_mcbsp_init(void)
{
    if (!of_have_populated_dt())
        omap_hwmod_for_each_by_class("mcbsp", omap_init_mcbsp, NULL);

    return 0;
}
arch_initcall(omap2_mcbsp_init);