1 /*
2 * Utility to set the DAVINCI MUX register from a table in mux.h
3 *
4 * Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
5 *
6 * Based on linux/arch/arm/plat-omap/mux.c:
7 * Copyright (C) 2003 - 2005 Nokia Corporation
8 *
9 * Written by Tony Lindgren
10 *
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.
15 *
16 * Copyright (C) 2008 Texas Instruments.
17 */
18 #include <linux/io.h>
19 #include <linux/module.h>
20 #include <linux/spinlock.h>
21
22 #include <mach/hardware.h>
23 #include <mach/mux.h>
24 #include <mach/common.h>
25
26 /*
27 * Sets the DAVINCI MUX register based on the table
28 */
29 int __init_or_module davinci_cfg_reg(const unsigned long index)
30 {
31 static DEFINE_SPINLOCK(mux_spin_lock);
32 struct davinci_soc_info *soc_info = &davinci_soc_info;
33 void __iomem *base = soc_info->pinmux_base;
34 unsigned long flags;
35 const struct mux_config *cfg;
36 unsigned int reg_orig = 0, reg = 0;
37 unsigned int mask, warn = 0;
38
39 if (!soc_info->pinmux_pins)
40 BUG();
41
42 if (index >= soc_info->pinmux_pins_num) {
43 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
44 index, soc_info->pinmux_pins_num);
45 dump_stack();
46 return -ENODEV;
47 }
48
49 cfg = &soc_info->pinmux_pins[index];
50
51 if (cfg->name == NULL) {
52 printk(KERN_ERR "No entry for the specified index\n");
53 return -ENODEV;
54 }
55
56 /* Update the mux register in question */
57 if (cfg->mask) {
58 unsigned tmp1, tmp2;
59
60 spin_lock_irqsave(&mux_spin_lock, flags);
61 reg_orig = __raw_readl(base + cfg->mux_reg);
62
63 mask = (cfg->mask << cfg->mask_offset);
64 tmp1 = reg_orig & mask;
65 reg = reg_orig & ~mask;
66
67 tmp2 = (cfg->mode << cfg->mask_offset);
68 reg |= tmp2;
69
70 if (tmp1 != tmp2)
71 warn = 1;
72
73 __raw_writel(reg, base + cfg->mux_reg);
74 spin_unlock_irqrestore(&mux_spin_lock, flags);
75 }
76
77 if (warn) {
78 #ifdef CONFIG_DAVINCI_MUX_WARNINGS
79 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
80 #endif
81 }
82
83 #ifdef CONFIG_DAVINCI_MUX_DEBUG
84 if (cfg->debug || warn) {
85 printk(KERN_WARNING "MUX: Setting register %s\n", cfg->name);
86 printk(KERN_WARNING " %s (0x%08x) = 0x%08x -> 0x%08x\n",
87 cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
88 }
89 #endif
90
91 return 0;
92 }
93 EXPORT_SYMBOL(davinci_cfg_reg);
94
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