| Sascha Hauer | bca6ef1 | 2009-04-01 11:11:48 +0200 | [diff] [blame^] | 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); |