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