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