/*
 * 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 <felipe.balbi@nokia.com>
 *
 * 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 <linux/pm_runtime.h>

#include <mach/hardware.h>
#include <mach/irqs.h>
#include <plat/mux.h>
#include <plat/usb.h>
#include <plat/omap_device.h>
#include <plat/omap_hwmod.h>

#ifdef CONFIG_USB_MUSB_SOC

static const char name[] = "musb_hdrc";
#define MAX_OMAP_MUSB_HWMOD_NAME_LEN	16

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_MUSB_OTG
	.mode		= MUSB_OTG,
#elif defined(CONFIG_USB_MUSB_HDRC_HCD)
	.mode		= MUSB_HOST,
#elif defined(CONFIG_USB_GADGET_MUSB_HDRC)
	.mode		= MUSB_PERIPHERAL,
#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 int usb_idle_hwmod(struct omap_device *od)
{
	struct omap_hwmod *oh = *od->hwmods;

	if (irqs_disabled())
		_omap_hwmod_idle(oh);
	else
		omap_device_idle_hwmods(od);
	return 0;
}

static int usb_enable_hwmod(struct omap_device *od)
{
	struct omap_hwmod *oh = *od->hwmods;

	if (irqs_disabled())
		_omap_hwmod_enable(oh);
	else
		omap_device_enable_hwmods(od);
	return 0;
}

static struct omap_device_pm_latency omap_musb_latency[] = {
	  {
		.deactivate_func = usb_idle_hwmod,
		.activate_func	 = usb_enable_hwmod,
		.flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
	  },
};

void __init usb_musb_init(struct omap_musb_board_data *board_data)
{
	char oh_name[MAX_OMAP_MUSB_HWMOD_NAME_LEN];
	struct omap_hwmod *oh;
	struct omap_device *od;
	struct platform_device *pdev;
	struct device	*dev;
	int l, bus_id = -1;
	struct musb_hdrc_platform_data *pdata;

	l = snprintf(oh_name, MAX_OMAP_MUSB_HWMOD_NAME_LEN,
						"usb_otg_hs");
	WARN(l >= MAX_OMAP_MUSB_HWMOD_NAME_LEN,
			"String buffer overflow in MUSB device setup\n");

	oh = omap_hwmod_lookup(oh_name);

	if (!oh) {
		pr_err("Could not look up %s\n", oh_name);
	} else {
		/*
		 * 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.device_enable = omap_device_enable;
		musb_plat.device_idle = omap_device_idle;
		musb_plat.enable_wakeup = omap_device_enable_wakeup;
		musb_plat.disable_wakeup = omap_device_disable_wakeup;
		/*
		 * Errata 1.166 idle_req/ack is broken in omap3430
		 * workaround is to disable the autodile bit for omap3430.
		 */
		if (cpu_is_omap3430())
			oh->flags |= HWMOD_NO_OCP_AUTOIDLE;

		musb_plat.oh = oh;
		pdata = &musb_plat;

		od = omap_device_build(name, bus_id, oh, pdata,
				       sizeof(struct musb_hdrc_platform_data),
							omap_musb_latency,
				       ARRAY_SIZE(omap_musb_latency), false);
		if (IS_ERR(od)) {
			pr_err("Could not build omap_device for %s %s\n",
						name, oh_name);
		} else {

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

void musb_context_save_restore(enum musb_state state)
{
	struct omap_hwmod *oh = omap_hwmod_lookup("usb_otg_hs");
	struct omap_device *od = oh->od;
	struct platform_device *pdev = &od->pdev;
	struct device *dev = &pdev->dev;
	struct device_driver *drv = dev->driver;

	if (drv) {
#ifdef CONFIG_PM_RUNTIME
		struct musb_hdrc_platform_data *pdata = dev->platform_data;
		const struct dev_pm_ops *pm = drv->pm;

		switch (state) {
		case save_context:
			/*Save the context, set the sysconfig setting to
			 * force standby force idle during idle and disable
			 * the clock.
			 */
			oh->flags |= HWMOD_SWSUP_SIDLE
					| HWMOD_SWSUP_MSTANDBY;
			pm->suspend(dev);
			pdata->device_idle(pdev);
			break;

		case disable_clk:
			/* set the sysconfig setting to force standby,
			 * force idle during idle and disable
			 * the clock.
			 */
			oh->flags |= HWMOD_SWSUP_SIDLE
					| HWMOD_SWSUP_MSTANDBY;
			pdata->device_idle(pdev);
			break;

		case restore_context:
			/* Enable the clock, set the sysconfig setting back
			 * to smart idle and smart stndby after wakeup.
			 *restore the context.
			 */
			oh->flags &= ~(HWMOD_SWSUP_SIDLE
					| HWMOD_SWSUP_MSTANDBY);
			pdata->device_enable(pdev);
			pm->resume_noirq(dev);
			break;

		case enable_clk:
			/* set the sysconfig setting back to smart idle and
			 * smart stndby after wakeup and enable the clock
			 */
			oh->flags &= ~(HWMOD_SWSUP_SIDLE
					| HWMOD_SWSUP_MSTANDBY);
			pdata->device_enable(pdev);
			break;

		default:
			break;
		}
#endif

	}
}

#else
void __init usb_musb_init(struct omap_musb_board_data *board_data)
{
}
#endif /* CONFIG_USB_MUSB_SOC */