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- // SPDX-License-Identifier: GPL-2.0
- /*
- * OMAP ulpi viewport support
- * Based on drivers/usb/ulpi/ulpi-viewport.c
- *
- * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
- * Author: Govindraj R <govindraj.raja@ti.com>
- */
- #include <common.h>
- #include <log.h>
- #include <asm/io.h>
- #include <linux/delay.h>
- #include <usb/ulpi.h>
- #define OMAP_ULPI_WR_OPSEL (2 << 22)
- #define OMAP_ULPI_RD_OPSEL (3 << 22)
- #define OMAP_ULPI_START (1 << 31)
- /*
- * Wait for having ulpi in done state
- */
- static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
- {
- int timeout = CONFIG_USB_ULPI_TIMEOUT;
- while (--timeout) {
- if (!(readl(ulpi_vp->viewport_addr) & mask))
- return 0;
- udelay(1);
- }
- return ULPI_ERROR;
- }
- /*
- * Issue a ULPI read/write request
- */
- static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
- {
- int err;
- writel(value, ulpi_vp->viewport_addr);
- err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
- if (err)
- debug("ULPI request timed out\n");
- return err;
- }
- int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
- {
- u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
- OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
- return ulpi_request(ulpi_vp, val);
- }
- u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
- {
- int err;
- u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
- OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
- err = ulpi_request(ulpi_vp, val);
- if (err)
- return err;
- return readl(ulpi_vp->viewport_addr) & 0xff;
- }
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