usb-musb.c

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/*
 * linux/arch/arm/mach-omap2/usb-musb.c
 *
 * This file will contain the board specific details for the
 * MENTOR USB OTG controller on OMAP3430
 *
 * Copyright (C) 2007-2008 Texas Instruments
 * Copyright (C) 2008 Nokia Corporation
 * Author: Vikram Pandita
 *
 * Generalization by:
 * Felipe Balbi <[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.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/usb/musb.h>

#include <plat/usb.h>
#include <plat/omap_device.h>

#include "am35xx.h"

#include "mux.h"

static struct musb_hdrc_config musb_config = {
    .multipoint = 1,
    .dyn_fifo   = 1,
    .num_eps    = 16,
    .ram_bits   = 12,
};

static struct musb_hdrc_platform_data musb_plat = {
#ifdef CONFIG_USB_GADGET_MUSB_HDRC
    .mode       = MUSB_OTG,
#else
    .mode       = MUSB_HOST,
#endif
    /* .clock is set dynamically */
    .config     = &musb_config,

    /* REVISIT charge pump on TWL4030 can supply up to
     * 100 mA ... but this value is board-specific, like
     * "mode", and should be passed to usb_musb_init().
     */
    .power      = 50,           /* up to 100 mA */
};

static u64 musb_dmamask = DMA_BIT_MASK(32);

static struct omap_musb_board_data musb_default_board_data = {
    .interface_type     = MUSB_INTERFACE_ULPI,
    .mode           = MUSB_OTG,
    .power          = 100,
};

void __init usb_musb_init(struct omap_musb_board_data *musb_board_data)
{
    struct omap_hwmod       *oh;
    struct platform_device      *pdev;
    struct device           *dev;
    int             bus_id = -1;
    const char          *oh_name, *name;
    struct omap_musb_board_data *board_data;

    if (musb_board_data)
        board_data = musb_board_data;
    else
        board_data = &musb_default_board_data;

    /*
     * REVISIT: This line can be removed once all the platforms using
     * musb_core.c have been converted to use use clkdev.
     */
    musb_plat.clock = "ick";
    musb_plat.board_data = board_data;
    musb_plat.power = board_data->power >> 1;
    musb_plat.mode = board_data->mode;
    musb_plat.extvbus = board_data->extvbus;

    if (soc_is_am35xx()) {
        oh_name = "am35x_otg_hs";
        name = "musb-am35x";
    } else if (cpu_is_ti81xx()) {
        oh_name = "usb_otg_hs";
        name = "musb-ti81xx";
    } else {
        oh_name = "usb_otg_hs";
        name = "musb-omap2430";
    }

        oh = omap_hwmod_lookup(oh_name);
        if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
                 __func__, oh_name))
                return;

    pdev = omap_device_build(name, bus_id, oh, &musb_plat,
                   sizeof(musb_plat), NULL, 0, false);
    if (IS_ERR(pdev)) {
        pr_err("Could not build omap_device for %s %s\n",
                        name, oh_name);
        return;
    }

    dev = &pdev->dev;
    get_device(dev);
    dev->dma_mask = &musb_dmamask;
    dev->coherent_dma_mask = musb_dmamask;
    put_device(dev);
}