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https://github.com/brain-hackers/u-boot-brain
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b0857c45c1
This patch fix the omap access to the transceiver configuration registers using the ulpi bus. As reported by the documentation the bit31 is used only to check if the transaction is done or still running and the reading and writing operation have different offset and have different values. What we need to do at the end of a transaction is leave the bus in done state. Anyway an error using the ulpi omap register is not recoverable so any error give out the usage of this interface. Tested on a custom OMAP5430 board with a TUSB1210 ULPI PHY on USBB1. Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com> Acked-by: Igor Grinberg <grinberg@compulab.co.il> Tested-by: Lubomir Popov <lpopov@mm-sol.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Marek Vasut <marex@denx.de> Cc: Tom Rini <trini@ti.com>
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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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 (2 << 22)
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#define OMAP_ULPI_RD_OPSEL (3 << 22)
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#define OMAP_ULPI_START (1 << 31)
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/*
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* Wait for having ulpi in done state
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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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* 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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writel(value, ulpi_vp->viewport_addr);
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err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
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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 = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 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 = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
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OMAP_ULPI_RD_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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