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 <asm/system.h>
30 #include <linux/spinlock.h>
31 #include <plat/mux.h>
32
33 #ifdef CONFIG_OMAP_MUX
34
35 static struct omap_mux_cfg *mux_cfg;
36
omap_mux_register(struct omap_mux_cfg * arch_mux_cfg)37 int __init omap_mux_register(struct omap_mux_cfg *arch_mux_cfg)
38 {
39 if (!arch_mux_cfg || !arch_mux_cfg->pins || arch_mux_cfg->size == 0
40 || !arch_mux_cfg->cfg_reg) {
41 printk(KERN_ERR "Invalid pin table\n");
42 return -EINVAL;
43 }
44
45 mux_cfg = arch_mux_cfg;
46
47 return 0;
48 }
49
50 /*
51 * Sets the Omap MUX and PULL_DWN registers based on the table
52 */
omap_cfg_reg(const unsigned long index)53 int __init_or_module omap_cfg_reg(const unsigned long index)
54 {
55 struct pin_config *reg;
56
57 if (!cpu_class_is_omap1()) {
58 printk(KERN_ERR "mux: Broken omap_cfg_reg(%lu) entry\n",
59 index);
60 WARN_ON(1);
61 return -EINVAL;
62 }
63
64 if (mux_cfg == NULL) {
65 printk(KERN_ERR "Pin mux table not initialized\n");
66 return -ENODEV;
67 }
68
69 if (index >= mux_cfg->size) {
70 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
71 index, mux_cfg->size);
72 dump_stack();
73 return -ENODEV;
74 }
75
76 reg = (struct pin_config *)&mux_cfg->pins[index];
77
78 if (!mux_cfg->cfg_reg)
79 return -ENODEV;
80
81 return mux_cfg->cfg_reg(reg);
82 }
83 EXPORT_SYMBOL(omap_cfg_reg);
84 #else
85 #define omap_mux_init() do {} while(0)
86 #define omap_cfg_reg(x) do {} while(0)
87 #endif /* CONFIG_OMAP_MUX */
88