projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ee398ba9 BG |
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 | ||
| 9a0e5110 | 15 | #include <linux/export.h> |
| ee398ba9 BG |
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 | ||
| 30 | static 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); | |
| 2b84f92b | 39 | } |
| ee398ba9 BG |
40 | |
| 41 | return -ETIMEDOUT; | |
| 42 | } | |
| 43 | ||
| 86753811 | 44 | static int ulpi_viewport_read(struct usb_phy *otg, u32 reg) |
| ee398ba9 BG |
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 | ||
| 86753811 | 62 | static int ulpi_viewport_write(struct usb_phy *otg, u32 val, u32 reg) |
| ee398ba9 BG |
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 | ||
| 298b083c | 78 | struct usb_phy_io_ops ulpi_viewport_access_ops = { |
| ee398ba9 BG |
79 | .read = ulpi_viewport_read, |
| 80 | .write = ulpi_viewport_write, | |
| 81 | }; | |
| 9a0e5110 | 82 | EXPORT_SYMBOL_GPL(ulpi_viewport_access_ops); |