mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
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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