projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| bca6ef1e SH |
1 | /* |
| 2 | * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved. | |
| 3 | * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de> | |
| 4 | * Copyright (C) 2009 by Jan Weitzel Phytec Messtechnik GmbH, | |
| 5 | * <armlinux@phytec.de> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU General Public License | |
| 9 | * as published by the Free Software Foundation; either version 2 | |
| 10 | * of the License, or (at your option) any later version. | |
| 11 | * This program is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | * GNU General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU General Public License | |
| 17 | * along with this program; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
| 19 | * MA 02110-1301, USA. | |
| 20 | */ | |
| 21 | #include <linux/errno.h> | |
| 22 | #include <linux/init.h> | |
| 23 | #include <linux/kernel.h> | |
| 24 | #include <linux/module.h> | |
| 25 | #include <linux/string.h> | |
| 26 | #include <linux/gpio.h> | |
| 27 | ||
| 28 | #include <mach/hardware.h> | |
| 29 | #include <asm/mach/map.h> | |
| 30 | #include <mach/iomux-v3.h> | |
| 31 | ||
| 32 | #define IOMUX_BASE IO_ADDRESS(IOMUXC_BASE_ADDR) | |
| 33 | ||
| 34 | static unsigned long iomux_v3_pad_alloc_map[0x200 / BITS_PER_LONG]; | |
| 35 | ||
| 36 | /* | |
| 37 | * setups a single pin: | |
| 38 | * - reserves the pin so that it is not claimed by another driver | |
| 39 | * - setups the iomux according to the configuration | |
| 40 | */ | |
| 41 | int mxc_iomux_v3_setup_pad(struct pad_desc *pad) | |
| 42 | { | |
| 43 | unsigned int pad_ofs = pad->pad_ctrl_ofs; | |
| 44 | ||
| 45 | if (test_and_set_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map)) | |
| 46 | return -EBUSY; | |
| 47 | if (pad->mux_ctrl_ofs) | |
| 48 | __raw_writel(pad->mux_mode, IOMUX_BASE + pad->mux_ctrl_ofs); | |
| 49 | ||
| 50 | if (pad->select_input_ofs) | |
| 51 | __raw_writel(pad->select_input, | |
| 52 | IOMUX_BASE + pad->select_input_ofs); | |
| 53 | ||
| 54 | if (!(pad->pad_ctrl & NO_PAD_CTRL)) | |
| 55 | __raw_writel(pad->pad_ctrl, IOMUX_BASE + pad->pad_ctrl_ofs); | |
| 56 | return 0; | |
| 57 | } | |
| 58 | EXPORT_SYMBOL(mxc_iomux_v3_setup_pad); | |
| 59 | ||
| 60 | int mxc_iomux_v3_setup_multiple_pads(struct pad_desc *pad_list, unsigned count) | |
| 61 | { | |
| 62 | struct pad_desc *p = pad_list; | |
| 63 | int i; | |
| 64 | int ret; | |
| 65 | ||
| 66 | for (i = 0; i < count; i++) { | |
| 67 | ret = mxc_iomux_v3_setup_pad(p); | |
| 68 | if (ret) | |
| 69 | goto setup_error; | |
| 70 | p++; | |
| 71 | } | |
| 72 | return 0; | |
| 73 | ||
| 74 | setup_error: | |
| 75 | mxc_iomux_v3_release_multiple_pads(pad_list, i); | |
| 76 | return ret; | |
| 77 | } | |
| 78 | EXPORT_SYMBOL(mxc_iomux_v3_setup_multiple_pads); | |
| 79 | ||
| 80 | void mxc_iomux_v3_release_pad(struct pad_desc *pad) | |
| 81 | { | |
| 82 | unsigned int pad_ofs = pad->pad_ctrl_ofs; | |
| 83 | ||
| 84 | clear_bit(pad_ofs >> 2, iomux_v3_pad_alloc_map); | |
| 85 | } | |
| 86 | EXPORT_SYMBOL(mxc_iomux_v3_release_pad); | |
| 87 | ||
| 88 | void mxc_iomux_v3_release_multiple_pads(struct pad_desc *pad_list, int count) | |
| 89 | { | |
| 90 | struct pad_desc *p = pad_list; | |
| 91 | int i; | |
| 92 | ||
| 93 | for (i = 0; i < count; i++) { | |
| 94 | mxc_iomux_v3_release_pad(p); | |
| 95 | p++; | |
| 96 | } | |
| 97 | } | |
| 98 | EXPORT_SYMBOL(mxc_iomux_v3_release_multiple_pads); |