text: /*
   * TI's Davinci platform specific USB wrapper functions.
   *
   * Copyright (c) 2008 Texas Instruments
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation; either version 2 of
   * the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
   * MA 02111-1307 USA
   *
   * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
   */
  
  #include <common.h>
  #include <asm/io.h>
  #include "davinci.h"
  #include <asm/arch/hardware.h>
  
  #if !defined(CONFIG_DV_USBPHY_CTL)
  #define CONFIG_DV_USBPHY_CTL (USBPHY_SESNDEN | USBPHY_VBDTCTEN)
  #endif
  
  /* MUSB platform configuration */
  struct musb_config musb_cfg = {
  	.regs		= (struct musb_regs *)MENTOR_USB0_BASE,
  	.timeout	= DAVINCI_USB_TIMEOUT,
  	.musb_speed	= 0,
  };
  
  /* MUSB module register overlay */
  struct davinci_usb_regs *dregs;
  
  /*
   * Enable the USB phy
   */
  static u8 phy_on(void)
  {
  	u32 timeout;
  #ifdef DAVINCI_DM365EVM
  	u32 val;
  #endif
  	/* Wait until the USB phy is turned on */
  #ifdef DAVINCI_DM365EVM
  	writel(USBPHY_PHY24MHZ | USBPHY_SESNDEN |
  			USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
  #else
  	writel(CONFIG_DV_USBPHY_CTL, USBPHY_CTL_PADDR);
  #endif
  	timeout = musb_cfg.timeout;
  
  #ifdef DAVINCI_DM365EVM
  	/* Set the ownership of GIO33 to USB */
  	val = readl(PINMUX4);
  	val &= ~(PINMUX4_USBDRVBUS_BITCLEAR);
  	val |= PINMUX4_USBDRVBUS_BITSET;
  	writel(val, PINMUX4);
  #endif
  	while (timeout--)
  		if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
  			return 1;
  
  	/* USB phy was not turned on */
  	return 0;
  }
  
  /*
   * Disable the USB phy
   */
  static void phy_off(void)
  {
  	/* powerdown the on-chip PHY and its oscillator */
  	writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
  }
  
  void __enable_vbus(void)
  {
  	/*
  	 *  nothing to do, vbus is handled through the cpu.
  	 *  Define this function in board code, if it is
  	 *  different on your board.
  	 */
  }
  void  enable_vbus(void)
  	__attribute__((weak, alias("__enable_vbus")));
  
  /*
   * This function performs Davinci platform specific initialization for usb0.
   */
  int musb_platform_init(void)
  {
  	u32  revision;
  
  	/* enable USB VBUS */
  	enable_vbus();
  
  	/* start the on-chip USB phy and its pll */
  	if (!phy_on())
  		return -1;
  
  	/* reset the controller */
  	dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
  	writel(1, &dregs->ctrlr);
  	udelay(5000);
  
  	/* Returns zero if e.g. not clocked */
  	revision = readl(&dregs->version);
  	if (!revision)
  		return -1;
  
  	/* Disable all interrupts */
  	writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
  			DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
  	return 0;
  }
  
  /*
   * This function performs Davinci platform specific deinitialization for usb0.
   */
  void musb_platform_deinit(void)
  {
  	/* Turn of the phy */
  	phy_off();
  
  	/* flush any interrupts */
  	writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
  			DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
  }
  