LXR uboot/drivers/usb/musb/am35x.c

   1/*
   2 * am35x.c - TI's AM35x platform specific usb wrapper functions.
   3 *
   4 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
   5 *
   6 * Based on drivers/usb/musb/da8xx.c
   7 *
   8 * Copyright (c) 2010 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 "am35x.h"
  27
  28/* MUSB platform configuration */
  29struct musb_config musb_cfg = {
  30        .regs           = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE,
  31        .timeout        = AM35X_USB_OTG_TIMEOUT,
  32        .musb_speed     = 0,
  33};
  34
  35/*
  36 * Enable the USB phy
  37 */
  38static u8 phy_on(void)
  39{
  40        u32 devconf2;
  41        u32 timeout;
  42
  43        devconf2 = readl(&am35x_scm_general_regs->devconf2);
  44
  45        devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
  46                      DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
  47                      DEVCONF2_PHY_GPIOMODE);
  48        devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
  49                    DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;
  50
  51        writel(devconf2, &am35x_scm_general_regs->devconf2);
  52
  53        /* wait until the USB phy is turned on */
  54        timeout = musb_cfg.timeout;
  55        while (timeout--)
  56                if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
  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        u32 devconf2;
  69
  70        /*
  71         * Power down the on-chip PHY.
  72         */
  73        devconf2 = readl(&am35x_scm_general_regs->devconf2);
  74
  75        devconf2 &= ~DEVCONF2_PHY_PLLON;
  76        devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
  77        writel(devconf2, &am35x_scm_general_regs->devconf2);
  78}
  79
  80/*
  81 * This function performs platform specific initialization for usb0.
  82 */
  83int musb_platform_init(void)
  84{
  85        u32 revision;
  86        u32 sw_reset;
  87
  88        /* global usb reset */
  89        sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
  90        sw_reset |= (1 << 0);
  91        writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
  92        sw_reset &= ~(1 << 0);
  93        writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
  94
  95        /* reset the controller */
  96        writel(0x1, &am35x_usb_regs->control);
  97        udelay(5000);
  98
  99        /* start the on-chip usb phy and its pll */
 100        if (phy_on() == 0)
 101                return -1;
 102
 103        /* Returns zero if e.g. not clocked */
 104        revision = readl(&am35x_usb_regs->revision);
 105        if (revision == 0)
 106                return -1;
 107
 108        return 0;
 109}
 110
 111/*
 112 * This function performs platform specific deinitialization for usb0.
 113 */
 114void musb_platform_deinit(void)
 115{
 116        /* Turn off the phy */
 117        phy_off();
 118}
 119
 120/*
 121 * This function reads data from endpoint fifo for AM35x
 122 * which supports only 32bit read operation.
 123 *
 124 * ep           - endpoint number
 125 * length       - number of bytes to read from FIFO
 126 * fifo_data    - pointer to data buffer into which data is read
 127 */
 128__attribute__((weak))
 129void read_fifo(u8 ep, u32 length, void *fifo_data)
 130{
 131        u8  *data = (u8 *)fifo_data;
 132        u32 val;
 133        int i;
 134
 135        /* select the endpoint index */
 136        writeb(ep, &musbr->index);
 137
 138        if (length > 4) {
 139                for (i = 0; i < (length >> 2); i++) {
 140                        val = readl(&musbr->fifox[ep]);
 141                        memcpy(data, &val, 4);
 142                        data += 4;
 143                }
 144                length %= 4;
 145        }
 146        if (length > 0) {
 147                val = readl(&musbr->fifox[ep]);
 148                memcpy(data, &val, length);
 149        }
 150}
 151