1// SPDX-License-Identifier: GPL-2.0
2/*
3 * OMAP ulpi viewport support
4 * Based on drivers/usb/ulpi/ulpi-viewport.c
5 *
6 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
7 * Author: Govindraj R <govindraj.raja@ti.com>
8 */
9
10#include <common.h>
11#include <log.h>
12#include <asm/io.h>
13#include <linux/delay.h>
14#include <usb/ulpi.h>
15
16#define OMAP_ULPI_WR_OPSEL	(2 << 22)
17#define OMAP_ULPI_RD_OPSEL	(3 << 22)
18#define OMAP_ULPI_START		(1 << 31)
19
20/*
21 * Wait for having ulpi in done state
22 */
23static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
24{
25	int timeout = CFG_USB_ULPI_TIMEOUT;
26
27	while (--timeout) {
28		if (!(readl(ulpi_vp->viewport_addr) & mask))
29			return 0;
30
31		udelay(1);
32	}
33
34	return ULPI_ERROR;
35}
36
37/*
38 * Issue a ULPI read/write request
39 */
40static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
41{
42	int err;
43
44	writel(value, ulpi_vp->viewport_addr);
45
46	err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
47	if (err)
48		debug("ULPI request timed out\n");
49
50	return err;
51}
52
53int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
54{
55	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
56			OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
57
58	return ulpi_request(ulpi_vp, val);
59}
60
61u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
62{
63	int err;
64	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
65			 OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
66
67	err = ulpi_request(ulpi_vp, val);
68	if (err)
69		return err;
70
71	return readl(ulpi_vp->viewport_addr) & 0xff;
72}
73