LXR uboot/drivers/usb/musb/da8xx.c

   1/*
   2 * da8xx.c - TI's DA8xx platform specific usb wrapper functions.
   3 *
   4 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
   5 *
   6 * Based on drivers/usb/musb/davinci.c
   7 *
   8 * Copyright (C) 2009 Texas Instruments Incorporated
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24#include <common.h>
  25
  26#include "da8xx.h"
  27
  28/* MUSB platform configuration */
  29struct musb_config musb_cfg = {
  30        .regs           = (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE,
  31        .timeout        = DA8XX_USB_OTG_TIMEOUT,
  32        .musb_speed     = 0,
  33};
  34
  35/*
  36 * This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
  37 */
  38static void enable_vbus(void)
  39{
  40        u32 value;
  41
  42        /* configure GPIO bank4 pin 15 in output direction */
  43        value = readl(&davinci_gpio_bank45->dir);
  44        writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir);
  45
  46        /* set GPIO bank4 pin 15 high to drive VBUS */
  47        value = readl(&davinci_gpio_bank45->set_data);
  48        writel((value | DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data);
  49}
  50
  51/*
  52 * Enable the usb0 phy. This initialization procedure is explained in
  53 * the DA8xx USB user guide document.
  54 */
  55static u8 phy_on(void)
  56{
  57        u32 timeout;
  58        u32 cfgchip2;
  59
  60        cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
  61
  62        cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
  63                      CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ);
  64        cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON |
  65                    CFGCHIP2_REFFREQ_24MHZ;
  66
  67        writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
  68
  69        /* wait until the usb phy pll locks */
  70        timeout = musb_cfg.timeout;
  71        while (timeout--)
  72                if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
  73                        return 1;
  74
  75        /* USB phy was not turned on */
  76        return 0;
  77}
  78
  79/*
  80 * Disable the usb phy
  81 */
  82static void phy_off(void)
  83{
  84        u32 cfgchip2;
  85
  86        /*
  87         * Power down the on-chip PHY.
  88         */
  89        cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
  90        cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
  91        cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
  92        writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
  93}
  94
  95/*
  96 * This function performs DA8xx platform specific initialization for usb0.
  97 */
  98int musb_platform_init(void)
  99{
 100        u32  revision;
 101
 102        /* enable psc for usb2.0 */
 103        lpsc_on(33);
 104
 105        /* enable usb vbus */
 106        enable_vbus();
 107
 108        /* reset the controller */
 109        writel(0x1, &da8xx_usb_regs->control);
 110        udelay(5000);
 111
 112        /* start the on-chip usb phy and its pll */
 113        if (phy_on() == 0)
 114                return -1;
 115
 116        /* Returns zero if e.g. not clocked */
 117        revision = readl(&da8xx_usb_regs->revision);
 118        if (revision == 0)
 119                return -1;
 120
 121        /* Disable all interrupts */
 122        writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
 123                DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
 124        return 0;
 125}
 126
 127/*
 128 * This function performs DA8xx platform specific deinitialization for usb0.
 129 */
 130void musb_platform_deinit(void)
 131{
 132        /* Turn of the phy */
 133        phy_off();
 134
 135        /* flush any interrupts */
 136        writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
 137                DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
 138        writel(0, &da8xx_usb_regs->eoi);
 139}
 140