1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2011 Google, Inc.
 
 
 
 
 
 
 
 
 
 
 4 */
 5
 6#include <linux/export.h>
 7#include <linux/kernel.h>
 8#include <linux/usb.h>
 9#include <linux/io.h>
10#include <linux/iopoll.h>
11#include <linux/usb/otg.h>
12#include <linux/usb/ulpi.h>
13
14#define ULPI_VIEW_WAKEUP	(1 << 31)
15#define ULPI_VIEW_RUN		(1 << 30)
16#define ULPI_VIEW_WRITE		(1 << 29)
17#define ULPI_VIEW_READ		(0 << 29)
18#define ULPI_VIEW_ADDR(x)	(((x) & 0xff) << 16)
19#define ULPI_VIEW_DATA_READ(x)	(((x) >> 8) & 0xff)
20#define ULPI_VIEW_DATA_WRITE(x)	((x) & 0xff)
21
22static int ulpi_viewport_wait(void __iomem *view, u32 mask)
23{
24	u32 val;
25
26	return readl_poll_timeout_atomic(view, val, !(val & mask), 1, 2000);
 
 
 
 
 
 
 
27}
28
29static int ulpi_viewport_read(struct usb_phy *otg, u32 reg)
30{
31	int ret;
32	void __iomem *view = otg->io_priv;
33
34	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
35	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
36	if (ret)
37		return ret;
38
39	writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view);
40	ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN);
41	if (ret)
42		return ret;
43
44	return ULPI_VIEW_DATA_READ(readl(view));
45}
46
47static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg)
48{
49	int ret;
50	void __iomem *view = otg->io_priv;
51
52	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
53	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
54	if (ret)
55		return ret;
56
57	writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) |
58						 ULPI_VIEW_ADDR(reg), view);
59
60	return ulpi_viewport_wait(view, ULPI_VIEW_RUN);
61}
62
63struct usb_phy_io_ops ulpi_viewport_access_ops = {
64	.read	= ulpi_viewport_read,
65	.write	= ulpi_viewport_write,
66};
67EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops);

 
 1/*
 2 * Copyright (C) 2011 Google, Inc.
 3 *
 4 * This software is licensed under the terms of the GNU General Public
 5 * License version 2, as published by the Free Software Foundation, and
 6 * may be copied, distributed, and modified under those terms.
 7 *
 8 * This program is distributed in the hope that it will be useful,
 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 */
14
15#include <linux/export.h>
16#include <linux/kernel.h>
17#include <linux/usb.h>
18#include <linux/io.h>
 
19#include <linux/usb/otg.h>
20#include <linux/usb/ulpi.h>
21
22#define ULPI_VIEW_WAKEUP	(1 << 31)
23#define ULPI_VIEW_RUN		(1 << 30)
24#define ULPI_VIEW_WRITE		(1 << 29)
25#define ULPI_VIEW_READ		(0 << 29)
26#define ULPI_VIEW_ADDR(x)	(((x) & 0xff) << 16)
27#define ULPI_VIEW_DATA_READ(x)	(((x) >> 8) & 0xff)
28#define ULPI_VIEW_DATA_WRITE(x)	((x) & 0xff)
29
30static int ulpi_viewport_wait(void __iomem *view, u32 mask)
31{
32	unsigned long usec = 2000;
33
34	while (usec--) {
35		if (!(readl(view) & mask))
36			return 0;
37
38		udelay(1);
39	}
40
41	return -ETIMEDOUT;
42}
43
44static int ulpi_viewport_read(struct usb_phy *otg, u32 reg)
45{
46	int ret;
47	void __iomem *view = otg->io_priv;
48
49	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
50	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
51	if (ret)
52		return ret;
53
54	writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view);
55	ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN);
56	if (ret)
57		return ret;
58
59	return ULPI_VIEW_DATA_READ(readl(view));
60}
61
62static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg)
63{
64	int ret;
65	void __iomem *view = otg->io_priv;
66
67	writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
68	ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
69	if (ret)
70		return ret;
71
72	writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) |
73						 ULPI_VIEW_ADDR(reg), view);
74
75	return ulpi_viewport_wait(view, ULPI_VIEW_RUN);
76}
77
78struct usb_phy_io_ops ulpi_viewport_access_ops = {
79	.read	= ulpi_viewport_read,
80	.write	= ulpi_viewport_write,
81};
82EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops);