| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/plat-omap/mux.c |
| 3 | * |
| 4 | * Utility to set the Omap MUX and PULL_DWN registers from a table in mux.h |
| 5 | * |
| 6 | * Copyright (C) 2003 - 2008 Nokia Corporation |
| 7 | * |
| 8 | * Written by Tony Lindgren |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | * |
| 24 | */ |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/io.h> |
| 29 | #include <linux/spinlock.h> |
| 30 | |
| 31 | #include <asm/system.h> |
| 32 | |
| 33 | #include <plat/cpu.h> |
| 34 | #include <plat/mux.h> |
| 35 | |
| 36 | #ifdef CONFIG_OMAP_MUX |
| 37 | |
| 38 | static struct omap_mux_cfg *mux_cfg; |
| 39 | |
| 40 | int __init omap_mux_register(struct omap_mux_cfg *arch_mux_cfg) |
| 41 | { |
| 42 | if (!arch_mux_cfg || !arch_mux_cfg->pins || arch_mux_cfg->size == 0 |
| 43 | || !arch_mux_cfg->cfg_reg) { |
| 44 | printk(KERN_ERR "Invalid pin table\n"); |
| 45 | return -EINVAL; |
| 46 | } |
| 47 | |
| 48 | mux_cfg = arch_mux_cfg; |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * Sets the Omap MUX and PULL_DWN registers based on the table |
| 55 | */ |
| 56 | int __init_or_module omap_cfg_reg(const unsigned long index) |
| 57 | { |
| 58 | struct pin_config *reg; |
| 59 | |
| 60 | if (!cpu_class_is_omap1()) { |
| 61 | printk(KERN_ERR "mux: Broken omap_cfg_reg(%lu) entry\n", |
| 62 | index); |
| 63 | WARN_ON(1); |
| 64 | return -EINVAL; |
| 65 | } |
| 66 | |
| 67 | if (mux_cfg == NULL) { |
| 68 | printk(KERN_ERR "Pin mux table not initialized\n"); |
| 69 | return -ENODEV; |
| 70 | } |
| 71 | |
| 72 | if (index >= mux_cfg->size) { |
| 73 | printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n", |
| 74 | index, mux_cfg->size); |
| 75 | dump_stack(); |
| 76 | return -ENODEV; |
| 77 | } |
| 78 | |
| 79 | reg = (struct pin_config *)&mux_cfg->pins[index]; |
| 80 | |
| 81 | if (!mux_cfg->cfg_reg) |
| 82 | return -ENODEV; |
| 83 | |
| 84 | return mux_cfg->cfg_reg(reg); |
| 85 | } |
| 86 | EXPORT_SYMBOL(omap_cfg_reg); |
| 87 | #else |
| 88 | #define omap_mux_init() do {} while(0) |
| 89 | #define omap_cfg_reg(x) do {} while(0) |
| 90 | #endif /* CONFIG_OMAP_MUX */ |