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 * SPDX-License-Identifier:     GPL-2.0
   9 */
  10
  11#include <common.h>
  12#include <asm/io.h>
  13#include <usb/ulpi.h>
  14
  15#define OMAP_ULPI_WR_OPSEL      (2 << 22)
  16#define OMAP_ULPI_RD_OPSEL      (3 << 22)
  17#define OMAP_ULPI_START         (1 << 31)
  18
  19/*
  20 * Wait for having ulpi in done state
  21 */
  22static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
  23{
  24        int timeout = CONFIG_USB_ULPI_TIMEOUT;
  25
  26        while (--timeout) {
  27                if (!(readl(ulpi_vp->viewport_addr) & mask))
  28                        return 0;
  29
  30                udelay(1);
  31        }
  32
  33        return ULPI_ERROR;
  34}
  35
  36/*
  37 * Issue a ULPI read/write request
  38 */
  39static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
  40{
  41        int err;
  42
  43        writel(value, ulpi_vp->viewport_addr);
  44
  45        err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
  46        if (err)
  47                debug("ULPI request timed out\n");
  48
  49        return err;
  50}
  51
  52int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
  53{
  54        u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
  55                        OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
  56
  57        return ulpi_request(ulpi_vp, val);
  58}
  59
  60u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
  61{
  62        int err;
  63        u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
  64                         OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
  65
  66        err = ulpi_request(ulpi_vp, val);
  67        if (err)
  68                return err;
  69
  70        return readl(ulpi_vp->viewport_addr) & 0xff;
  71}
  72