| Govindraj.R | 928c4bd | 2012-02-06 03:55:32 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * OMAP ulpi viewport support |
| 3 | * Based on drivers/usb/ulpi/ulpi-viewport.c |
| 4 | * |
| 5 | * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com |
| 6 | * Author: Govindraj R <govindraj.raja@ti.com> |
| 7 | * |
| 8 | * This program is free software: you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 of |
| 10 | * the License as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include <common.h> |
| 22 | #include <asm/io.h> |
| 23 | #include <usb/ulpi.h> |
| 24 | |
| 25 | #define OMAP_ULPI_WR_OPSEL (3 << 21) |
| 26 | #define OMAP_ULPI_ACCESS (1 << 31) |
| 27 | |
| 28 | /* |
| 29 | * Wait for the ULPI Access to complete |
| 30 | */ |
| 31 | static int ulpi_wait(struct ulpi_viewport *ulpi_vp, u32 mask) |
| 32 | { |
| 33 | int timeout = CONFIG_USB_ULPI_TIMEOUT; |
| 34 | |
| 35 | while (--timeout) { |
| 36 | if ((readl(ulpi_vp->viewport_addr) & mask)) |
| 37 | return 0; |
| 38 | |
| 39 | udelay(1); |
| 40 | } |
| 41 | |
| 42 | return ULPI_ERROR; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * Wake the ULPI PHY up for communication |
| 47 | * |
| 48 | * returns 0 on success. |
| 49 | */ |
| 50 | static int ulpi_wakeup(struct ulpi_viewport *ulpi_vp) |
| 51 | { |
| 52 | int err; |
| 53 | |
| 54 | if (readl(ulpi_vp->viewport_addr) & OMAP_ULPI_ACCESS) |
| 55 | return 0; /* already awake */ |
| 56 | |
| 57 | writel(OMAP_ULPI_ACCESS, ulpi_vp->viewport_addr); |
| 58 | |
| 59 | err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS); |
| 60 | if (err) |
| 61 | debug("ULPI wakeup timed out\n"); |
| 62 | |
| 63 | return err; |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * Issue a ULPI read/write request |
| 68 | */ |
| 69 | static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value) |
| 70 | { |
| 71 | int err; |
| 72 | |
| 73 | err = ulpi_wakeup(ulpi_vp); |
| 74 | if (err) |
| 75 | return err; |
| 76 | |
| 77 | writel(value, ulpi_vp->viewport_addr); |
| 78 | |
| 79 | err = ulpi_wait(ulpi_vp, OMAP_ULPI_ACCESS); |
| 80 | if (err) |
| 81 | debug("ULPI request timed out\n"); |
| 82 | |
| 83 | return err; |
| 84 | } |
| 85 | |
| 86 | int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value) |
| 87 | { |
| 88 | u32 val = ((ulpi_vp->port_num & 0xf) << 24) | |
| 89 | OMAP_ULPI_WR_OPSEL | ((u32)reg << 16) | (value & 0xff); |
| 90 | |
| 91 | return ulpi_request(ulpi_vp, val); |
| 92 | } |
| 93 | |
| 94 | u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg) |
| 95 | { |
| 96 | int err; |
| 97 | u32 val = ((ulpi_vp->port_num & 0xf) << 24) | |
| 98 | OMAP_ULPI_WR_OPSEL | ((u32)reg << 16); |
| 99 | |
| 100 | err = ulpi_request(ulpi_vp, val); |
| 101 | if (err) |
| 102 | return err; |
| 103 | |
| 104 | return readl(ulpi_vp->viewport_addr) & 0xff; |
| 105 | } |