LXR uboot/drivers/usb/musb/davinci.c

   1/*
   2 * TI's Davinci platform specific USB wrapper functions.
   3 *
   4 * Copyright (c) 2008 Texas Instruments
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License as
   8 * published by the Free Software Foundation; either version 2 of
   9 * the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19 * MA 02111-1307 USA
  20 *
  21 * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
  22 */
  23
  24#include <common.h>
  25#include <asm/io.h>
  26#include "davinci.h"
  27
  28/* MUSB platform configuration */
  29struct musb_config musb_cfg = {
  30        (struct musb_regs *)MENTOR_USB0_BASE,
  31        DAVINCI_USB_TIMEOUT,
  32        0
  33};
  34
  35/* MUSB module register overlay */
  36struct davinci_usb_regs *dregs;
  37
  38/*
  39 * Enable the USB phy
  40 */
  41static u8 phy_on(void)
  42{
  43        u32 timeout;
  44
  45        /* Wait until the USB phy is turned on */
  46        writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
  47        timeout = musb_cfg.timeout;
  48        while (timeout--)
  49                if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
  50                        return 1;
  51
  52        /* USB phy was not turned on */
  53        return 0;
  54}
  55
  56/*
  57 * Disable the USB phy
  58 */
  59static void phy_off(void)
  60{
  61        /* powerdown the on-chip PHY and its oscillator */
  62        writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
  63}
  64
  65/*
  66 * This function performs Davinci platform specific initialization for usb0.
  67 */
  68int musb_platform_init(void)
  69{
  70        u32  revision;
  71
  72        /* enable USB VBUS */
  73        enable_vbus();
  74
  75        /* start the on-chip USB phy and its pll */
  76        if (!phy_on())
  77                return -1;
  78
  79        /* reset the controller */
  80        dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
  81        writel(1, &dregs->ctrlr);
  82        udelay(5000);
  83
  84        /* Returns zero if e.g. not clocked */
  85        revision = readl(&dregs->version);
  86        if (!revision)
  87                return -1;
  88
  89        /* Disable all interrupts */
  90        writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
  91                        DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
  92        return 0;
  93}
  94
  95/*
  96 * This function performs Davinci platform specific deinitialization for usb0.
  97 */
  98void musb_platform_deinit(void)
  99{
 100        /* Turn of the phy */
 101        phy_off();
 102
 103        /* flush any interrupts */
 104        writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
 105                        DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
 106}
 107