mirror of
https://github.com/AsahiLinux/u-boot
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106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
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/*
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* OMAP ulpi viewport support
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* Based on drivers/usb/ulpi/ulpi-viewport.c
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
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* Author: Govindraj R <govindraj.raja@ti.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <usb/ulpi.h>
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#define OMAP_ULPI_WR_OPSEL (3 << 21)
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#define OMAP_ULPI_ACCESS (1 << 31)
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/*
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* Wait for the ULPI Access to complete
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*/
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static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
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{
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int timeout = CONFIG_USB_ULPI_TIMEOUT;
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while (--timeout) {
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if ((readl(ulpi_vp->viewport_addr) & mask))
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return 0;
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udelay(1);
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}
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return ULPI_ERROR;
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}
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/*
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* Wake the ULPI PHY up for communication
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*
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* returns 0 on success.
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*/
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static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp)
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{
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int err;
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if (readl(ulpi_vp->viewport_addr) & OMAP_ULPI_ACCESS)
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return 0; /* already awake */
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writel(OMAP_ULPI_ACCESS, ulpi_vp->viewport_addr);
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err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
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if (err)
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debug("ULPI wakeup timed out\n");
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return err;
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}
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/*
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* Issue a ULPI read/write request
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*/
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static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
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{
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int err;
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err = ulpi_wakeup(ulpi_vp);
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if (err)
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return err;
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writel(value, ulpi_vp->viewport_addr);
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err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS);
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if (err)
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debug("ULPI request timed out\n");
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return err;
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}
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int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
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{
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u32 val = ((ulpi_vp->port_num & 0xf) << 24) |
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OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
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return ulpi_request(ulpi_vp, val);
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}
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u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
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{
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int err;
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u32 val = ((ulpi_vp->port_num & 0xf) << 24) |
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OMAP_ULPI_WR_OPSEL | ((u32)reg << 16);
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err = ulpi_request(ulpi_vp, val);
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if (err)
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return err;
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return readl(ulpi_vp->viewport_addr) & 0xff;
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}
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