73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#include <common.h>
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#include <log.h>
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#include <asm/io.h>
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#include <linux/delay.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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