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 * SPDX-License-Identifier:     GPL-2.0+
   7 *
   8 * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
   9 */
  10
  11#include <common.h>
  12#include <asm/io.h>
  13#include "davinci.h"
  14#include <asm/arch/hardware.h>
  15
  16#if !defined(CONFIG_DV_USBPHY_CTL)
  17#define CONFIG_DV_USBPHY_CTL (USBPHY_SESNDEN | USBPHY_VBDTCTEN)
  18#endif
  19
  20/* MUSB platform configuration */
  21struct musb_config musb_cfg = {
  22        .regs           = (struct musb_regs *)MENTOR_USB0_BASE,
  23        .timeout        = DAVINCI_USB_TIMEOUT,
  24        .musb_speed     = 0,
  25};
  26
  27/* MUSB module register overlay */
  28struct davinci_usb_regs *dregs;
  29
  30/*
  31 * Enable the USB phy
  32 */
  33static u8 phy_on(void)
  34{
  35        u32 timeout;
  36#ifdef DAVINCI_DM365EVM
  37        u32 val;
  38#endif
  39        /* Wait until the USB phy is turned on */
  40#ifdef DAVINCI_DM365EVM
  41        writel(USBPHY_PHY24MHZ | USBPHY_SESNDEN |
  42                        USBPHY_VBDTCTEN, USBPHY_CTL_PADDR);
  43#else
  44        writel(CONFIG_DV_USBPHY_CTL, USBPHY_CTL_PADDR);
  45#endif
  46        timeout = musb_cfg.timeout;
  47
  48#ifdef DAVINCI_DM365EVM
  49        /* Set the ownership of GIO33 to USB */
  50        val = readl(PINMUX4);
  51        val &= ~(PINMUX4_USBDRVBUS_BITCLEAR);
  52        val |= PINMUX4_USBDRVBUS_BITSET;
  53        writel(val, PINMUX4);
  54#endif
  55        while (timeout--)
  56                if (readl(USBPHY_CTL_PADDR) & USBPHY_PHYCLKGD)
  57                        return 1;
  58
  59        /* USB phy was not turned on */
  60        return 0;
  61}
  62
  63/*
  64 * Disable the USB phy
  65 */
  66static void phy_off(void)
  67{
  68        /* powerdown the on-chip PHY and its oscillator */
  69        writel(USBPHY_OSCPDWN | USBPHY_PHYPDWN, USBPHY_CTL_PADDR);
  70}
  71
  72void __enable_vbus(void)
  73{
  74        /*
  75         *  nothing to do, vbus is handled through the cpu.
  76         *  Define this function in board code, if it is
  77         *  different on your board.
  78         */
  79}
  80void  enable_vbus(void)
  81        __attribute__((weak, alias("__enable_vbus")));
  82
  83/*
  84 * This function performs Davinci platform specific initialization for usb0.
  85 */
  86int musb_platform_init(void)
  87{
  88        u32  revision;
  89
  90        /* enable USB VBUS */
  91        enable_vbus();
  92
  93        /* start the on-chip USB phy and its pll */
  94        if (!phy_on())
  95                return -1;
  96
  97        /* reset the controller */
  98        dregs = (struct davinci_usb_regs *)DAVINCI_USB0_BASE;
  99        writel(1, &dregs->ctrlr);
 100        udelay(5000);
 101
 102        /* Returns zero if e.g. not clocked */
 103        revision = readl(&dregs->version);
 104        if (!revision)
 105                return -1;
 106
 107        /* Disable all interrupts */
 108        writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_RXINT_MASK |
 109                        DAVINCI_USB_TXINT_MASK , &dregs->intmsksetr);
 110        return 0;
 111}
 112
 113/*
 114 * This function performs Davinci platform specific deinitialization for usb0.
 115 */
 116void musb_platform_deinit(void)
 117{
 118        /* Turn of the phy */
 119        phy_off();
 120
 121        /* flush any interrupts */
 122        writel(DAVINCI_USB_USBINT_MASK | DAVINCI_USB_TXINT_MASK |
 123                        DAVINCI_USB_RXINT_MASK , &dregs->intclrr);
 124}
 125