davinci: add support for DM6467T EVM
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / arm / mach-davinci / mux.c
blobf757e83415f373ffccf8cfcc9ce070d75519e87a
1 /*
2 * Utility to set the DAVINCI MUX register from a table in mux.h
4 * Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
6 * Based on linux/arch/arm/plat-omap/mux.c:
7 * Copyright (C) 2003 - 2005 Nokia Corporation
9 * Written by Tony Lindgren
11 * 2007 (c) MontaVista Software, Inc. This file is licensed under
12 * the terms of the GNU General Public License version 2. This program
13 * is licensed "as is" without any warranty of any kind, whether express
14 * or implied.
16 * Copyright (C) 2008 Texas Instruments.
18 #include <linux/io.h>
19 #include <linux/module.h>
20 #include <linux/spinlock.h>
22 #include <mach/mux.h>
23 #include <mach/common.h>
26 * Sets the DAVINCI MUX register based on the table
28 int __init_or_module davinci_cfg_reg(const unsigned long index)
30 static DEFINE_SPINLOCK(mux_spin_lock);
31 struct davinci_soc_info *soc_info = &davinci_soc_info;
32 void __iomem *base = soc_info->pinmux_base;
33 unsigned long flags;
34 const struct mux_config *cfg;
35 unsigned int reg_orig = 0, reg = 0;
36 unsigned int mask, warn = 0;
38 if (!soc_info->pinmux_pins)
39 BUG();
41 if (index >= soc_info->pinmux_pins_num) {
42 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
43 index, soc_info->pinmux_pins_num);
44 dump_stack();
45 return -ENODEV;
48 cfg = &soc_info->pinmux_pins[index];
50 if (cfg->name == NULL) {
51 printk(KERN_ERR "No entry for the specified index\n");
52 return -ENODEV;
55 /* Update the mux register in question */
56 if (cfg->mask) {
57 unsigned tmp1, tmp2;
59 spin_lock_irqsave(&mux_spin_lock, flags);
60 reg_orig = __raw_readl(base + cfg->mux_reg);
62 mask = (cfg->mask << cfg->mask_offset);
63 tmp1 = reg_orig & mask;
64 reg = reg_orig & ~mask;
66 tmp2 = (cfg->mode << cfg->mask_offset);
67 reg |= tmp2;
69 if (tmp1 != tmp2)
70 warn = 1;
72 __raw_writel(reg, base + cfg->mux_reg);
73 spin_unlock_irqrestore(&mux_spin_lock, flags);
76 if (warn) {
77 #ifdef CONFIG_DAVINCI_MUX_WARNINGS
78 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
79 #endif
82 #ifdef CONFIG_DAVINCI_MUX_DEBUG
83 if (cfg->debug || warn) {
84 printk(KERN_WARNING "MUX: Setting register %s\n", cfg->name);
85 printk(KERN_WARNING " %s (0x%08x) = 0x%08x -> 0x%08x\n",
86 cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
88 #endif
90 return 0;
92 EXPORT_SYMBOL(davinci_cfg_reg);
94 int da8xx_pinmux_setup(const short pins[])
96 int i, error = -EINVAL;
98 if (pins)
99 for (i = 0; pins[i] >= 0; i++) {
100 error = davinci_cfg_reg(pins[i]);
101 if (error)
102 break;
105 return error;