1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2011 Google, Inc.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/export.h>
7*4882a593Smuzhiyun #include <linux/kernel.h>
8*4882a593Smuzhiyun #include <linux/usb.h>
9*4882a593Smuzhiyun #include <linux/io.h>
10*4882a593Smuzhiyun #include <linux/iopoll.h>
11*4882a593Smuzhiyun #include <linux/usb/otg.h>
12*4882a593Smuzhiyun #include <linux/usb/ulpi.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define ULPI_VIEW_WAKEUP (1 << 31)
15*4882a593Smuzhiyun #define ULPI_VIEW_RUN (1 << 30)
16*4882a593Smuzhiyun #define ULPI_VIEW_WRITE (1 << 29)
17*4882a593Smuzhiyun #define ULPI_VIEW_READ (0 << 29)
18*4882a593Smuzhiyun #define ULPI_VIEW_ADDR(x) (((x) & 0xff) << 16)
19*4882a593Smuzhiyun #define ULPI_VIEW_DATA_READ(x) (((x) >> 8) & 0xff)
20*4882a593Smuzhiyun #define ULPI_VIEW_DATA_WRITE(x) ((x) & 0xff)
21*4882a593Smuzhiyun
ulpi_viewport_wait(void __iomem * view,u32 mask)22*4882a593Smuzhiyun static int ulpi_viewport_wait(void __iomem *view, u32 mask)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun u32 val;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun return readl_poll_timeout_atomic(view, val, !(val & mask), 1, 2000);
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
ulpi_viewport_read(struct usb_phy * otg,u32 reg)29*4882a593Smuzhiyun static int ulpi_viewport_read(struct usb_phy *otg, u32 reg)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun int ret;
32*4882a593Smuzhiyun void __iomem *view = otg->io_priv;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
35*4882a593Smuzhiyun ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
36*4882a593Smuzhiyun if (ret)
37*4882a593Smuzhiyun return ret;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view);
40*4882a593Smuzhiyun ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN);
41*4882a593Smuzhiyun if (ret)
42*4882a593Smuzhiyun return ret;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return ULPI_VIEW_DATA_READ(readl(view));
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
ulpi_viewport_write(struct usb_phy * otg,u32 val,u32 reg)47*4882a593Smuzhiyun static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun int ret;
50*4882a593Smuzhiyun void __iomem *view = otg->io_priv;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
53*4882a593Smuzhiyun ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP);
54*4882a593Smuzhiyun if (ret)
55*4882a593Smuzhiyun return ret;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) |
58*4882a593Smuzhiyun ULPI_VIEW_ADDR(reg), view);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun return ulpi_viewport_wait(view, ULPI_VIEW_RUN);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun struct usb_phy_io_ops ulpi_viewport_access_ops = {
64*4882a593Smuzhiyun .read = ulpi_viewport_read,
65*4882a593Smuzhiyun .write = ulpi_viewport_write,
66*4882a593Smuzhiyun };
67*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops);
68