LXR uboot/drivers/usb/ulpi/omap-ulpi-viewport.c

   1/*
   2 * OMAP ulpi viewport support
   3 * Based on drivers/usb/ulpi/ulpi-viewport.c
   4 *
   5 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
   6 * Author: Govindraj R <govindraj.raja@ti.com>
   7 *
   8 * This program is free software: you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2  of
  10 * the License as published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21#include <common.h>
  22#include <asm/io.h>
  23#include <usb/ulpi.h>
  24
  25#define OMAP_ULPI_WR_OPSEL      (2 << 22)
  26#define OMAP_ULPI_RD_OPSEL      (3 << 22)
  27#define OMAP_ULPI_START         (1 << 31)
  28
  29/*
  30 * Wait for having ulpi in done state
  31 */
  32static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
  33{
  34        int timeout = CONFIG_USB_ULPI_TIMEOUT;
  35
  36        while (--timeout) {
  37                if (!(readl(ulpi_vp->viewport_addr) & mask))
  38                        return 0;
  39
  40                udelay(1);
  41        }
  42
  43        return ULPI_ERROR;
  44}
  45
  46/*
  47 * Issue a ULPI read/write request
  48 */
  49static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
  50{
  51        int err;
  52
  53        writel(value, ulpi_vp->viewport_addr);
  54
  55        err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
  56        if (err)
  57                debug("ULPI request timed out\n");
  58
  59        return err;
  60}
  61
  62int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
  63{
  64        u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
  65                        OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
  66
  67        return ulpi_request(ulpi_vp, val);
  68}
  69
  70u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
  71{
  72        int err;
  73        u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
  74                         OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
  75
  76        err = ulpi_request(ulpi_vp, val);
  77        if (err)
  78                return err;
  79
  80        return readl(ulpi_vp->viewport_addr) & 0xff;
  81}
  82