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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/kernel.h> | |
16 | #include <linux/usb.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/usb/otg.h> | |
19 | #include <linux/usb/ulpi.h> | |
20 | ||
21 | #define ULPI_VIEW_WAKEUP (1 << 31) | |
22 | #define ULPI_VIEW_RUN (1 << 30) | |
23 | #define ULPI_VIEW_WRITE (1 << 29) | |
24 | #define ULPI_VIEW_READ (0 << 29) | |
25 | #define ULPI_VIEW_ADDR(x) (((x) & 0xff) << 16) | |
26 | #define ULPI_VIEW_DATA_READ(x) (((x) >> 8) & 0xff) | |
27 | #define ULPI_VIEW_DATA_WRITE(x) ((x) & 0xff) | |
28 | ||
29 | static int ulpi_viewport_wait(void __iomem *view, u32 mask) | |
30 | { | |
31 | unsigned long usec = 2000; | |
32 | ||
33 | while (usec--) { | |
34 | if (!(readl(view) & mask)) | |
35 | return 0; | |
36 | ||
37 | udelay(1); | |
38 | }; | |
39 | ||
40 | return -ETIMEDOUT; | |
41 | } | |
42 | ||
43 | static int ulpi_viewport_read(struct otg_transceiver *otg, u32 reg) | |
44 | { | |
45 | int ret; | |
46 | void __iomem *view = otg->io_priv; | |
47 | ||
48 | writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); | |
49 | ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); | |
50 | if (ret) | |
51 | return ret; | |
52 | ||
53 | writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view); | |
54 | ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN); | |
55 | if (ret) | |
56 | return ret; | |
57 | ||
58 | return ULPI_VIEW_DATA_READ(readl(view)); | |
59 | } | |
60 | ||
61 | static int ulpi_viewport_write(struct otg_transceiver *otg, u32 val, u32 reg) | |
62 | { | |
63 | int ret; | |
64 | void __iomem *view = otg->io_priv; | |
65 | ||
66 | writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); | |
67 | ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); | |
68 | if (ret) | |
69 | return ret; | |
70 | ||
71 | writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) | | |
72 | ULPI_VIEW_ADDR(reg), view); | |
73 | ||
74 | return ulpi_viewport_wait(view, ULPI_VIEW_RUN); | |
75 | } | |
76 | ||
77 | struct otg_io_access_ops ulpi_viewport_access_ops = { | |
78 | .read = ulpi_viewport_read, | |
79 | .write = ulpi_viewport_write, | |
80 | }; |