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usb_dr.c

/*
 * Copyright 2005-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/fsl_devices.h>
#include <mach/arc_otg.h>
#include <mach/hardware.h>
#include "usb.h"

static int usbotg_init_ext(struct platform_device *pdev);
static void usbotg_uninit_ext(struct fsl_usb2_platform_data *pdata);
static void _wake_up_enable(struct fsl_usb2_platform_data *pdata, bool enable);
static void usbotg_clock_gate(bool on);

/*
 * platform data structs
 *    - Which one to use is determined by CONFIG options in usb.h
 *    - operating_mode plugged at run time
 */
static struct fsl_usb2_platform_data __maybe_unused dr_utmi_config = {
      .name              = "DR",
      .platform_init     = usbotg_init_ext,
      .platform_uninit   = usbotg_uninit_ext,
      .phy_mode          = FSL_USB2_PHY_UTMI_WIDE,
      .power_budget      = 500,           /* 500 mA max power */
      .gpio_usb_active   = gpio_usbotg_hs_active,
      .gpio_usb_inactive = gpio_usbotg_hs_inactive,
      .usb_clock_for_pm  = usbotg_clock_gate,
      .wake_up_enable = _wake_up_enable,
      .transceiver       = "utmi",
};


/*
 * resources
 */
static struct resource otg_resources[] = {
      [0] = {
            .start = (u32)(USB_OTGREGS_BASE),
            .end   = (u32)(USB_OTGREGS_BASE + 0x1ff),
            .flags = IORESOURCE_MEM,
      },
      [1] = {
            .start = MXC_INT_USB_OTG,
            .flags = IORESOURCE_IRQ,
      },
};


static u64 dr_udc_dmamask = ~(u32) 0;
static void dr_udc_release(struct device *dev)
{
}

static u64 dr_otg_dmamask = ~(u32) 0;
static void dr_otg_release(struct device *dev)
{
}

/*
 * platform device structs
 *    dev.platform_data field plugged at run time
 */
static struct platform_device dr_udc_device = {
      .name = "fsl-usb2-udc",
      .id   = -1,
      .dev  = {
            .release           = dr_udc_release,
            .dma_mask          = &dr_udc_dmamask,
            .coherent_dma_mask = 0xffffffff,
      },
      .resource      = otg_resources,
      .num_resources = ARRAY_SIZE(otg_resources),
};

static struct platform_device __maybe_unused dr_otg_device = {
      .name = "fsl-usb2-otg",
      .id = -1,
      .dev = {
            .release           = dr_otg_release,
            .dma_mask          = &dr_otg_dmamask,
            .coherent_dma_mask = 0xffffffff,
      },
      .resource      = otg_resources,
      .num_resources = ARRAY_SIZE(otg_resources),
};

/* Notes: configure USB clock*/
static int usbotg_init_ext(struct platform_device *pdev)
{
      struct clk *usb_clk;

      usb_clk = clk_get(NULL, "usboh3_clk");
      clk_enable(usb_clk);
      clk_put(usb_clk);

      usb_clk = clk_get(NULL, "usb_phy_clk");
      clk_enable(usb_clk);
      clk_put(usb_clk);

      /*derive clock from oscillator */
      usb_clk = clk_get(NULL, "usb_utmi_clk");
      clk_disable(usb_clk);
      clk_put(usb_clk);

      return usbotg_init(pdev);
}

static void usbotg_uninit_ext(struct fsl_usb2_platform_data *pdata)
{
      struct clk *usb_clk;

      usb_clk = clk_get(NULL, "usboh3_clk");
      clk_disable(usb_clk);
      clk_put(usb_clk);

      usb_clk = clk_get(NULL, "usb_phy_clk");
      clk_disable(usb_clk);
      clk_put(usb_clk);

      usbotg_uninit(pdata);
}

static void _wake_up_enable(struct fsl_usb2_platform_data *pdata, bool enable)
{
      if (get_usb_mode(pdata) == FSL_USB_DR_DEVICE) {
            if (enable) {
                  USBCTRL |= UCTRL_OWIE;
                  USBCTRL_HOST2 |= UCTRL_H2OVBWK_EN;
                  USB_PHY_CTR_FUNC |= USB_UTMI_PHYCTRL_CONF2;
            } else {
                  USBCTRL &= ~UCTRL_OWIE;
                  USBCTRL_HOST2 &= ~UCTRL_H2OVBWK_EN;
                  USB_PHY_CTR_FUNC &= ~USB_UTMI_PHYCTRL_CONF2;
            }
      } else {
            if (enable) {
                  USBCTRL |= UCTRL_OWIE;
                  USBCTRL_HOST2 |= (1 << 5);
            } else {
                  USBCTRL &= ~UCTRL_OWIE;
                  USBCTRL_HOST2 &= ~(1 << 5);
            }
      }
}

static void usbotg_clock_gate(bool on)
{
      struct clk *usb_clk;

      if (on) {
            usb_clk = clk_get(NULL, "usb_ahb_clk");
            clk_enable(usb_clk);
            clk_put(usb_clk);

            usb_clk = clk_get(NULL, "usboh3_clk");
            clk_enable(usb_clk);
            clk_put(usb_clk);

            usb_clk = clk_get(NULL, "usb_phy_clk");
            clk_enable(usb_clk);
            clk_put(usb_clk);

            /*derive clock from oscillator */
            usb_clk = clk_get(NULL, "usb_utmi_clk");
            clk_disable(usb_clk);
            clk_put(usb_clk);
      } else {
            usb_clk = clk_get(NULL, "usboh3_clk");
            clk_disable(usb_clk);
            clk_put(usb_clk);

            usb_clk = clk_get(NULL, "usb_phy_clk");
            clk_disable(usb_clk);
            clk_put(usb_clk);

            usb_clk = clk_get(NULL, "usb_ahb_clk");
            clk_disable(usb_clk);
            clk_put(usb_clk);
      }
}

static int __init usb_dr_init(void)
{
      pr_debug("%s: \n", __func__);

      dr_register_otg();
      dr_register_host(otg_resources, ARRAY_SIZE(otg_resources));
      dr_register_udc();

      return 0;
}

module_init(usb_dr_init);

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