Merge branch 'atmel'
[linux-2.6] / arch / arm / plat-omap / mux.c
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 - 2005 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 <linux/kernel.h>
29 #include <asm/system.h>
30 #include <asm/io.h>
31 #include <linux/spinlock.h>
32 #include <asm/arch/mux.h>
33
34 #ifdef CONFIG_OMAP_MUX
35
36 #define OMAP24XX_L4_BASE        0x48000000
37 #define OMAP24XX_PULL_ENA       (1 << 3)
38 #define OMAP24XX_PULL_UP        (1 << 4)
39
40 static struct pin_config * pin_table;
41 static unsigned long pin_table_sz;
42
43 extern struct pin_config * omap730_pins;
44 extern struct pin_config * omap1xxx_pins;
45 extern struct pin_config * omap24xx_pins;
46
47 int __init omap_mux_register(struct pin_config * pins, unsigned long size)
48 {
49         pin_table = pins;
50         pin_table_sz = size;
51
52         return 0;
53 }
54
55 /*
56  * Sets the Omap MUX and PULL_DWN registers based on the table
57  */
58 int __init_or_module omap_cfg_reg(const unsigned long index)
59 {
60         static DEFINE_SPINLOCK(mux_spin_lock);
61
62         unsigned long flags;
63         struct pin_config *cfg;
64         unsigned int reg_orig = 0, reg = 0, pu_pd_orig = 0, pu_pd = 0,
65                 pull_orig = 0, pull = 0;
66         unsigned int mask, warn = 0;
67
68         if (!pin_table)
69                 BUG();
70
71         if (index >= pin_table_sz) {
72                 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
73                        index, pin_table_sz);
74                 dump_stack();
75                 return -ENODEV;
76         }
77
78         cfg = (struct pin_config *)&pin_table[index];
79         if (cpu_is_omap24xx()) {
80                 u8 reg = 0;
81
82                 reg |= cfg->mask & 0x7;
83                 if (cfg->pull_val)
84                         reg |= OMAP24XX_PULL_ENA;
85                 if(cfg->pu_pd_val)
86                         reg |= OMAP24XX_PULL_UP;
87 #ifdef CONFIG_OMAP_MUX_DEBUG
88                 printk("Muxing %s (0x%08x): 0x%02x -> 0x%02x\n",
89                        cfg->name, OMAP24XX_L4_BASE + cfg->mux_reg,
90                        omap_readb(OMAP24XX_L4_BASE + cfg->mux_reg), reg);
91 #endif
92                 omap_writeb(reg, OMAP24XX_L4_BASE + cfg->mux_reg);
93
94                 return 0;
95         }
96
97         /* Check the mux register in question */
98         if (cfg->mux_reg) {
99                 unsigned        tmp1, tmp2;
100
101                 spin_lock_irqsave(&mux_spin_lock, flags);
102                 reg_orig = omap_readl(cfg->mux_reg);
103
104                 /* The mux registers always seem to be 3 bits long */
105                 mask = (0x7 << cfg->mask_offset);
106                 tmp1 = reg_orig & mask;
107                 reg = reg_orig & ~mask;
108
109                 tmp2 = (cfg->mask << cfg->mask_offset);
110                 reg |= tmp2;
111
112                 if (tmp1 != tmp2)
113                         warn = 1;
114
115                 omap_writel(reg, cfg->mux_reg);
116                 spin_unlock_irqrestore(&mux_spin_lock, flags);
117         }
118
119         /* Check for pull up or pull down selection on 1610 */
120         if (!cpu_is_omap1510()) {
121                 if (cfg->pu_pd_reg && cfg->pull_val) {
122                         spin_lock_irqsave(&mux_spin_lock, flags);
123                         pu_pd_orig = omap_readl(cfg->pu_pd_reg);
124                         mask = 1 << cfg->pull_bit;
125
126                         if (cfg->pu_pd_val) {
127                                 if (!(pu_pd_orig & mask))
128                                         warn = 1;
129                                 /* Use pull up */
130                                 pu_pd = pu_pd_orig | mask;
131                         } else {
132                                 if (pu_pd_orig & mask)
133                                         warn = 1;
134                                 /* Use pull down */
135                                 pu_pd = pu_pd_orig & ~mask;
136                         }
137                         omap_writel(pu_pd, cfg->pu_pd_reg);
138                         spin_unlock_irqrestore(&mux_spin_lock, flags);
139                 }
140         }
141
142         /* Check for an associated pull down register */
143         if (cfg->pull_reg) {
144                 spin_lock_irqsave(&mux_spin_lock, flags);
145                 pull_orig = omap_readl(cfg->pull_reg);
146                 mask = 1 << cfg->pull_bit;
147
148                 if (cfg->pull_val) {
149                         if (pull_orig & mask)
150                                 warn = 1;
151                         /* Low bit = pull enabled */
152                         pull = pull_orig & ~mask;
153                 } else {
154                         if (!(pull_orig & mask))
155                                 warn = 1;
156                         /* High bit = pull disabled */
157                         pull = pull_orig | mask;
158                 }
159
160                 omap_writel(pull, cfg->pull_reg);
161                 spin_unlock_irqrestore(&mux_spin_lock, flags);
162         }
163
164         if (warn) {
165 #ifdef CONFIG_OMAP_MUX_WARNINGS
166                 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
167 #endif
168         }
169
170 #ifdef CONFIG_OMAP_MUX_DEBUG
171         if (cfg->debug || warn) {
172                 printk("MUX: Setting register %s\n", cfg->name);
173                 printk("      %s (0x%08x) = 0x%08x -> 0x%08x\n",
174                        cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
175
176                 if (!cpu_is_omap1510()) {
177                         if (cfg->pu_pd_reg && cfg->pull_val) {
178                                 printk("      %s (0x%08x) = 0x%08x -> 0x%08x\n",
179                                        cfg->pu_pd_name, cfg->pu_pd_reg,
180                                        pu_pd_orig, pu_pd);
181                         }
182                 }
183
184                 if (cfg->pull_reg)
185                         printk("      %s (0x%08x) = 0x%08x -> 0x%08x\n",
186                                cfg->pull_name, cfg->pull_reg, pull_orig, pull);
187         }
188 #endif
189
190 #ifdef CONFIG_OMAP_MUX_ERRORS
191         return warn ? -ETXTBSY : 0;
192 #else
193         return 0;
194 #endif
195 }
196 EXPORT_SYMBOL(omap_cfg_reg);
197 #else
198 #define omap_mux_init() do {} while(0)
199 #define omap_cfg_reg(x) do {} while(0)
200 #endif  /* CONFIG_OMAP_MUX */