1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * OMAP ulpi viewport support
3*4882a593Smuzhiyun * Based on drivers/usb/ulpi/ulpi-viewport.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
6*4882a593Smuzhiyun * Author: Govindraj R <govindraj.raja@ti.com>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <common.h>
12*4882a593Smuzhiyun #include <asm/io.h>
13*4882a593Smuzhiyun #include <usb/ulpi.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define OMAP_ULPI_WR_OPSEL (2 << 22)
16*4882a593Smuzhiyun #define OMAP_ULPI_RD_OPSEL (3 << 22)
17*4882a593Smuzhiyun #define OMAP_ULPI_START (1 << 31)
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /*
20*4882a593Smuzhiyun * Wait for having ulpi in done state
21*4882a593Smuzhiyun */
ulpi_wait(struct ulpi_viewport * ulpi_vp,u32 mask)22*4882a593Smuzhiyun static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun int timeout = CONFIG_USB_ULPI_TIMEOUT;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun while (--timeout) {
27*4882a593Smuzhiyun if (!(readl(ulpi_vp->viewport_addr) & mask))
28*4882a593Smuzhiyun return 0;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun udelay(1);
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun return ULPI_ERROR;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /*
37*4882a593Smuzhiyun * Issue a ULPI read/write request
38*4882a593Smuzhiyun */
ulpi_request(struct ulpi_viewport * ulpi_vp,u32 value)39*4882a593Smuzhiyun static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun int err;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun writel(value, ulpi_vp->viewport_addr);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun err = ulpi_wait(ulpi_vp, OMAP_ULPI_START);
46*4882a593Smuzhiyun if (err)
47*4882a593Smuzhiyun debug("ULPI request timed out\n");
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun return err;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
ulpi_write(struct ulpi_viewport * ulpi_vp,u8 * reg,u32 value)52*4882a593Smuzhiyun int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
55*4882a593Smuzhiyun OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun return ulpi_request(ulpi_vp, val);
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
ulpi_read(struct ulpi_viewport * ulpi_vp,u8 * reg)60*4882a593Smuzhiyun u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun int err;
63*4882a593Smuzhiyun u32 val = OMAP_ULPI_START | (((ulpi_vp->port_num + 1) & 0xf) << 24) |
64*4882a593Smuzhiyun OMAP_ULPI_RD_OPSEL | ((u32)reg << 16);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun err = ulpi_request(ulpi_vp, val);
67*4882a593Smuzhiyun if (err)
68*4882a593Smuzhiyun return err;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun return readl(ulpi_vp->viewport_addr) & 0xff;
71*4882a593Smuzhiyun }
72