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#include <asm/arch/hardware.h>
  28
  29/* MUSB platform configuration */
  30struct musb_config musb_cfg = {
  31        .regs           = (struct musb_regs *)MENTOR_USB0_BASE,
  32        .timeout        = DAVINCI_USB_TIMEOUT,
  33        .musb_speed     = 0,
  34};
  35
  36/* MUSB module register overlay */
  37struct davinci_usb_regs *dregs;
  38
  39/*
  40 * Enable the USB phy
  41 */
  42static u8 phy_on(void)
  43{
  44        u32 timeout;
  45#ifdef DAVINCI_DM365EVM
  46        u32 val;
  47#endif
  48        /* Wait until the USB phy is turned on */
  49#ifdef DAVINCI_DM365EVM
  50        writel(USBPHY_PHY24MHZ | USBPHY_SESNDEN |
  51                        USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
  52#else
  53        writel(USBPHY_SESNDEN | USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
  54#endif
  55        timeout = musb_cfg.timeout;
  56
  57#ifdef DAVINCI_DM365EVM
  58        /* Set the ownership of GIO33 to USB */
  59        val = readl(PINMUX4);
  60        val &= ~(PINMUX4_USBDRVBUS_BITCLEAR);
  61        val |= PINMUX4_USBDRVBUS_BITSET;
  62        writel(val, PINMUX4);
  63#endif
  64        while (timeout--)
  65                if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
  66                        return 1;
  67
  68        /* USB phy was not turned on */
  69        return 0;
  70}
  71
  72/*
  73 * Disable the USB phy
  74 */
  75static void phy_off(void)
  76{
  77        /* powerdown the on-chip PHY and its oscillator */
  78        writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
  79}
  80
  81/*
  82 * This function performs Davinci platform specific initialization for usb0.
  83 */
  84int musb_platform_init(void)
  85{
  86        u32  revision;
  87
  88        /* enable USB VBUS */
  89#ifndef DAVINCI_DM365EVM
  90        enable_vbus();
  91#endif
  92        /* start the on-chip USB phy and its pll */
  93        if (!phy_on())
  94                return -1;
  95
  96        /* reset the controller */
  97        dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
  98        writel(1, &dregs->ctrlr);
  99        udelay(5000);
 100
 101        /* Returns zero if e.g. not clocked */
 102        revision = readl(&dregs->version);
 103        if (!revision)
 104                return -1;
 105
 106        /* Disable all interrupts */
 107        writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
 108                        DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
 109        return 0;
 110}
 111
 112/*
 113 * This function performs Davinci platform specific deinitialization for usb0.
 114 */
 115void musb_platform_deinit(void)
 116{
 117        /* Turn of the phy */
 118        phy_off();
 119
 120        /* flush any interrupts */
 121        writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
 122                        DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
 123}
 124