projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f4f8bda2 DM |
1 | /* |
| 2 | * Copyright 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> | |
| 3 | * Copyright 2009 Daniel Mack <daniel@caiaq.de> | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or | |
| 6 | * modify it under the terms of the GNU General Public License | |
| 7 | * as published by the Free Software Foundation; either version 2 | |
| 8 | * of the License, or (at your option) any later version. | |
| 9 | * This program is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU General Public License | |
| 15 | * along with this program; if not, write to the Free Software | |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
| 17 | * MA 02110-1301, USA. | |
| 18 | */ | |
| 19 | ||
| 20 | #include <linux/module.h> | |
| 21 | #include <linux/kernel.h> | |
| 22 | #include <linux/io.h> | |
| 23 | #include <linux/delay.h> | |
| 24 | #include <linux/usb/otg.h> | |
| 25 | ||
| 26 | #include <mach/ulpi.h> | |
| 27 | ||
| 28 | /* ULPIVIEW register bits */ | |
| 29 | #define ULPIVW_WU (1 << 31) /* Wakeup */ | |
| 30 | #define ULPIVW_RUN (1 << 30) /* read/write run */ | |
| 31 | #define ULPIVW_WRITE (1 << 29) /* 0 = read 1 = write */ | |
| 32 | #define ULPIVW_SS (1 << 27) /* SyncState */ | |
| 33 | #define ULPIVW_PORT_MASK 0x07 /* Port field */ | |
| 34 | #define ULPIVW_PORT_SHIFT 24 | |
| 35 | #define ULPIVW_ADDR_MASK 0xff /* data address field */ | |
| 36 | #define ULPIVW_ADDR_SHIFT 16 | |
| 37 | #define ULPIVW_RDATA_MASK 0xff /* read data field */ | |
| 38 | #define ULPIVW_RDATA_SHIFT 8 | |
| 39 | #define ULPIVW_WDATA_MASK 0xff /* write data field */ | |
| 40 | #define ULPIVW_WDATA_SHIFT 0 | |
| 41 | ||
| 42 | static int ulpi_poll(void __iomem *view, u32 bit) | |
| 43 | { | |
| 44 | int timeout = 10000; | |
| 45 | ||
| 46 | while (timeout--) { | |
| 47 | u32 data = __raw_readl(view); | |
| 48 | ||
| 49 | if (!(data & bit)) | |
| 50 | return 0; | |
| 51 | ||
| 52 | cpu_relax(); | |
| 53 | }; | |
| 54 | ||
| 55 | printk(KERN_WARNING "timeout polling for ULPI device\n"); | |
| 56 | ||
| 57 | return -ETIMEDOUT; | |
| 58 | } | |
| 59 | ||
| 60 | static int ulpi_read(struct otg_transceiver *otg, u32 reg) | |
| 61 | { | |
| 62 | int ret; | |
| 63 | void __iomem *view = otg->io_priv; | |
| 64 | ||
| 65 | /* make sure interface is running */ | |
| 66 | if (!(__raw_readl(view) & ULPIVW_SS)) { | |
| 67 | __raw_writel(ULPIVW_WU, view); | |
| 68 | ||
| 69 | /* wait for wakeup */ | |
| 70 | ret = ulpi_poll(view, ULPIVW_WU); | |
| 71 | if (ret) | |
| 72 | return ret; | |
| 73 | } | |
| 74 | ||
| 75 | /* read the register */ | |
| 76 | __raw_writel((ULPIVW_RUN | (reg << ULPIVW_ADDR_SHIFT)), view); | |
| 77 | ||
| 78 | /* wait for completion */ | |
| 79 | ret = ulpi_poll(view, ULPIVW_RUN); | |
| 80 | if (ret) | |
| 81 | return ret; | |
| 82 | ||
| 83 | return (__raw_readl(view) >> ULPIVW_RDATA_SHIFT) & ULPIVW_RDATA_MASK; | |
| 84 | } | |
| 85 | ||
| 86 | static int ulpi_write(struct otg_transceiver *otg, u32 val, u32 reg) | |
| 87 | { | |
| 88 | int ret; | |
| 89 | void __iomem *view = otg->io_priv; | |
| 90 | ||
| 91 | /* make sure the interface is running */ | |
| 92 | if (!(__raw_readl(view) & ULPIVW_SS)) { | |
| 93 | __raw_writel(ULPIVW_WU, view); | |
| 94 | /* wait for wakeup */ | |
| 95 | ret = ulpi_poll(view, ULPIVW_WU); | |
| 96 | if (ret) | |
| 97 | return ret; | |
| 98 | } | |
| 99 | ||
| 100 | __raw_writel((ULPIVW_RUN | ULPIVW_WRITE | | |
| 101 | (reg << ULPIVW_ADDR_SHIFT) | | |
| 102 | ((val & ULPIVW_WDATA_MASK) << ULPIVW_WDATA_SHIFT)), view); | |
| 103 | ||
| 104 | /* wait for completion */ | |
| 105 | return ulpi_poll(view, ULPIVW_RUN); | |
| 106 | } | |
| 107 | ||
| 108 | struct otg_io_access_ops mxc_ulpi_access_ops = { | |
| 109 | .read = ulpi_read, | |
| 110 | .write = ulpi_write, | |
| 111 | }; | |
| 112 | EXPORT_SYMBOL_GPL(mxc_ulpi_access_ops); | |
| 113 |