113 lines
2.3 KiB
C
113 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
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* Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
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*
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* Authors: Jana Rapava <fermata7@gmail.com>
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* Igor Grinberg <grinberg@compulab.co.il>
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*
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* Based on:
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* linux/drivers/usb/otg/ulpi_viewport.c
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*
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* Original Copyright follow:
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* Copyright (C) 2011 Google, Inc.
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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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/* ULPI viewport control bits */
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#define ULPI_SS (1 << 27)
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#define ULPI_RWCTRL (1 << 29)
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#define ULPI_RWRUN (1 << 30)
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#define ULPI_WU (1 << 31)
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/*
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* Wait for the ULPI request to complete
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*
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* @ulpi_viewport - the address of the viewport
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* @mask - expected value to wait for
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*
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* returns 0 on mask match, ULPI_ERROR on time out.
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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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/* Wait for the bits in mask to become zero. */
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while (--timeout) {
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if ((readl(ulpi_vp->viewport_addr) & mask) == 0)
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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) & ULPI_SS)
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return 0; /* already awake */
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writel(ULPI_WU, ulpi_vp->viewport_addr);
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err = ulpi_wait(ulpi_vp, ULPI_WU);
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if (err)
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printf("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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* @value - the ULPI 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, ULPI_RWRUN);
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if (err)
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printf("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 addr = (uintptr_t)reg & 0xFF;
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u32 val = ULPI_RWRUN | ULPI_RWCTRL | addr << 16 | (value & 0xff);
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val |= (ulpi_vp->port_num & 0x7) << 24;
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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_RWRUN | ((uintptr_t)reg & 0xFF) << 16;
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val |= (ulpi_vp->port_num & 0x7) << 24;
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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) >> 8) & 0xff;
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}
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