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 <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 */
ulpi_wait(struct ulpi_viewport * ulpi_vp,u32 mask)23 static 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 */
ulpi_request(struct ulpi_viewport * ulpi_vp,u32 value)40 static 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
ulpi_write(struct ulpi_viewport * ulpi_vp,u8 * reg,u32 value)53 int 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
ulpi_read(struct ulpi_viewport * ulpi_vp,u8 * reg)61 u32 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