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authorTony Lindgren <tony@atomide.com>2005-07-10 14:58:15 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-07-10 14:58:15 -0400
commit5e1c5ff4783e0ddd241580c9996390508722190e (patch)
tree6c0a8a16046936f9046488790f817e0aa5884ac5 /arch/arm/plat-omap/mux.c
parentb91585560b59fd3ef4e20ca6f7d35aefda193774 (diff)
[PATCH] ARM: 2812/1: OMAP update 7c/11: Move arch-omap to plat-omap
Patch from Tony Lindgren This patch move common OMAP code from arch-omap to plat-omap directory. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/plat-omap/mux.c')
-rw-r--r--arch/arm/plat-omap/mux.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/mux.c b/arch/arm/plat-omap/mux.c
new file mode 100644
index 000000000000..cbecd10d0b6c
--- /dev/null
+++ b/arch/arm/plat-omap/mux.c
@@ -0,0 +1,163 @@
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 Nokia Corporation
7 *
8 * Written by Tony Lindgren <tony.lindgren@nokia.com>
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/config.h>
26#include <linux/module.h>
27#include <linux/init.h>
28#include <asm/system.h>
29#include <asm/io.h>
30#include <linux/spinlock.h>
31
32#define __MUX_C__
33#include <asm/arch/mux.h>
34
35#ifdef CONFIG_OMAP_MUX
36
37/*
38 * Sets the Omap MUX and PULL_DWN registers based on the table
39 */
40int __init_or_module
41omap_cfg_reg(const reg_cfg_t reg_cfg)
42{
43 static DEFINE_SPINLOCK(mux_spin_lock);
44
45 unsigned long flags;
46 reg_cfg_set *cfg;
47 unsigned int reg_orig = 0, reg = 0, pu_pd_orig = 0, pu_pd = 0,
48 pull_orig = 0, pull = 0;
49 unsigned int mask, warn = 0;
50
51 if (reg_cfg > ARRAY_SIZE(reg_cfg_table)) {
52 printk(KERN_ERR "MUX: reg_cfg %d\n", reg_cfg);
53 return -EINVAL;
54 }
55
56 cfg = &reg_cfg_table[reg_cfg];
57
58 /*
59 * We do a pretty long section here with lock on, but pin muxing
60 * should only happen on driver init for each driver, so it's not time
61 * critical.
62 */
63 spin_lock_irqsave(&mux_spin_lock, flags);
64
65 /* Check the mux register in question */
66 if (cfg->mux_reg) {
67 unsigned tmp1, tmp2;
68
69 reg_orig = omap_readl(cfg->mux_reg);
70
71 /* The mux registers always seem to be 3 bits long */
72 mask = (0x7 << cfg->mask_offset);
73 tmp1 = reg_orig & mask;
74 reg = reg_orig & ~mask;
75
76 tmp2 = (cfg->mask << cfg->mask_offset);
77 reg |= tmp2;
78
79 if (tmp1 != tmp2)
80 warn = 1;
81
82 omap_writel(reg, cfg->mux_reg);
83 }
84
85 /* Check for pull up or pull down selection on 1610 */
86 if (!cpu_is_omap1510()) {
87 if (cfg->pu_pd_reg && cfg->pull_val) {
88 pu_pd_orig = omap_readl(cfg->pu_pd_reg);
89 mask = 1 << cfg->pull_bit;
90
91 if (cfg->pu_pd_val) {
92 if (!(pu_pd_orig & mask))
93 warn = 1;
94 /* Use pull up */
95 pu_pd = pu_pd_orig | mask;
96 } else {
97 if (pu_pd_orig & mask)
98 warn = 1;
99 /* Use pull down */
100 pu_pd = pu_pd_orig & ~mask;
101 }
102 omap_writel(pu_pd, cfg->pu_pd_reg);
103 }
104 }
105
106 /* Check for an associated pull down register */
107 if (cfg->pull_reg) {
108 pull_orig = omap_readl(cfg->pull_reg);
109 mask = 1 << cfg->pull_bit;
110
111 if (cfg->pull_val) {
112 if (pull_orig & mask)
113 warn = 1;
114 /* Low bit = pull enabled */
115 pull = pull_orig & ~mask;
116 } else {
117 if (!(pull_orig & mask))
118 warn = 1;
119 /* High bit = pull disabled */
120 pull = pull_orig | mask;
121 }
122
123 omap_writel(pull, cfg->pull_reg);
124 }
125
126 if (warn) {
127#ifdef CONFIG_OMAP_MUX_WARNINGS
128 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
129#endif
130 }
131
132#ifdef CONFIG_OMAP_MUX_DEBUG
133 if (cfg->debug || warn) {
134 printk("MUX: Setting register %s\n", cfg->name);
135 printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
136 cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
137
138 if (!cpu_is_omap1510()) {
139 if (cfg->pu_pd_reg && cfg->pull_val) {
140 printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
141 cfg->pu_pd_name, cfg->pu_pd_reg,
142 pu_pd_orig, pu_pd);
143 }
144 }
145
146 if (cfg->pull_reg)
147 printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
148 cfg->pull_name, cfg->pull_reg, pull_orig, pull);
149 }
150#endif
151
152 spin_unlock_irqrestore(&mux_spin_lock, flags);
153
154#ifdef CONFIG_OMAP_MUX_ERRORS
155 return warn ? -ETXTBSY : 0;
156#else
157 return 0;
158#endif
159}
160
161EXPORT_SYMBOL(omap_cfg_reg);
162
163#endif /* CONFIG_OMAP_MUX */