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  * This program is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2  of
10  * the License as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program. If not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #include <common.h>
22 #include <asm/io.h>
23 #include <usb/ulpi.h>
24 
25 #define OMAP_ULPI_WR_OPSEL	(2 << 22)
26 #define OMAP_ULPI_RD_OPSEL	(3 << 22)
27 #define OMAP_ULPI_START		(1 << 31)
28 
29 /*
30  * Wait for having ulpi in done state
31  */
32 static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
33 {
34 	int timeout = CONFIG_USB_ULPI_TIMEOUT;
35 
36 	while (--timeout) {
37 		if (!(readl(ulpi_vp->viewport_addr) & mask))
38 			return 0;
39 
40 		udelay(1);
41 	}
42 
43 	return ULPI_ERROR;
44 }
45 
46 /*
47  * Issue a ULPI read/write request
48  */
49 static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
50 {
51 	int err;
52 
53 	writel(value, ulpi_vp->viewport_addr);
54 
55 	err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
56 	if (err)
57 		debug("ULPI request timed out\n");
58 
59 	return err;
60 }
61 
62 int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
63 {
64 	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
65 			OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
66 
67 	return ulpi_request(ulpi_vp, val);
68 }
69 
70 u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
71 {
72 	int err;
73 	u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
74 			 OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
75 
76 	err = ulpi_request(ulpi_vp, val);
77 	if (err)
78 		return err;
79 
80 	return readl(ulpi_vp->viewport_addr) & 0xff;
81 }
82