2 * linux/arch/arm/plat-omap/mux.c
4 * Utility to set the Omap MUX and PULL_DWN registers from a table in mux.h
6 * Copyright (C) 2003 - 2005 Nokia Corporation
8 * Written by Tony Lindgren <tony.lindgren@nokia.com>
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.
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.
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
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <asm/system.h>
30 #include <linux/spinlock.h>
31 #include <asm/arch/mux.h>
33 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
34 # include "../mach-omap2/control.h"
37 #ifdef CONFIG_OMAP_MUX
39 #define OMAP24XX_PULL_ENA (1 << 3)
40 #define OMAP24XX_PULL_UP (1 << 4)
42 static struct pin_config * pin_table;
43 static unsigned long pin_table_sz;
45 extern struct pin_config * omap730_pins;
46 extern struct pin_config * omap1xxx_pins;
47 extern struct pin_config * omap24xx_pins;
49 int __init omap_mux_register(struct pin_config * pins, unsigned long size)
58 * Sets the Omap MUX and PULL_DWN registers based on the table
60 int __init_or_module omap_cfg_reg(const unsigned long index)
62 static DEFINE_SPINLOCK(mux_spin_lock);
65 struct pin_config *cfg;
66 unsigned int reg_orig = 0, reg = 0, pu_pd_orig = 0, pu_pd = 0,
67 pull_orig = 0, pull = 0;
68 unsigned int mask, warn = 0;
73 if (index >= pin_table_sz) {
74 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
80 cfg = (struct pin_config *)&pin_table[index];
81 #ifdef CONFIG_ARCH_OMAP24XX
82 /* REVISIT: Convert this code to use ctrl_{read,write}_reg */
83 if (cpu_is_omap24xx()) {
86 reg |= cfg->mask & 0x7;
88 reg |= OMAP24XX_PULL_ENA;
90 reg |= OMAP24XX_PULL_UP;
91 #if defined(CONFIG_OMAP_MUX_DEBUG) || defined(CONFIG_OMAP_MUX_WARNINGS)
93 u8 orig = omap_readb(omap2_ctrl_base + cfg->mux_reg);
96 #ifdef CONFIG_OMAP_MUX_DEBUG
101 printk("MUX: setup %s (0x%08lx): 0x%02x -> 0x%02x\n",
103 omap2_ctrl_base + cfg->mux_reg,
107 omap_writeb(reg, omap2_ctrl_base + cfg->mux_reg);
111 #endif /* ARCH_OMAP24XX */
113 /* Check the mux register in question */
117 spin_lock_irqsave(&mux_spin_lock, flags);
118 reg_orig = omap_readl(cfg->mux_reg);
120 /* The mux registers always seem to be 3 bits long */
121 mask = (0x7 << cfg->mask_offset);
122 tmp1 = reg_orig & mask;
123 reg = reg_orig & ~mask;
125 tmp2 = (cfg->mask << cfg->mask_offset);
131 omap_writel(reg, cfg->mux_reg);
132 spin_unlock_irqrestore(&mux_spin_lock, flags);
135 /* Check for pull up or pull down selection on 1610 */
136 if (!cpu_is_omap15xx()) {
137 if (cfg->pu_pd_reg && cfg->pull_val) {
138 spin_lock_irqsave(&mux_spin_lock, flags);
139 pu_pd_orig = omap_readl(cfg->pu_pd_reg);
140 mask = 1 << cfg->pull_bit;
142 if (cfg->pu_pd_val) {
143 if (!(pu_pd_orig & mask))
146 pu_pd = pu_pd_orig | mask;
148 if (pu_pd_orig & mask)
151 pu_pd = pu_pd_orig & ~mask;
153 omap_writel(pu_pd, cfg->pu_pd_reg);
154 spin_unlock_irqrestore(&mux_spin_lock, flags);
158 /* Check for an associated pull down register */
160 spin_lock_irqsave(&mux_spin_lock, flags);
161 pull_orig = omap_readl(cfg->pull_reg);
162 mask = 1 << cfg->pull_bit;
165 if (pull_orig & mask)
167 /* Low bit = pull enabled */
168 pull = pull_orig & ~mask;
170 if (!(pull_orig & mask))
172 /* High bit = pull disabled */
173 pull = pull_orig | mask;
176 omap_writel(pull, cfg->pull_reg);
177 spin_unlock_irqrestore(&mux_spin_lock, flags);
181 #ifdef CONFIG_OMAP_MUX_WARNINGS
182 printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
186 #ifdef CONFIG_OMAP_MUX_DEBUG
187 if (cfg->debug || warn) {
188 printk("MUX: Setting register %s\n", cfg->name);
189 printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
190 cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
192 if (!cpu_is_omap15xx()) {
193 if (cfg->pu_pd_reg && cfg->pull_val) {
194 printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
195 cfg->pu_pd_name, cfg->pu_pd_reg,
201 printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
202 cfg->pull_name, cfg->pull_reg, pull_orig, pull);
206 #ifdef CONFIG_OMAP_MUX_ERRORS
207 return warn ? -ETXTBSY : 0;
212 EXPORT_SYMBOL(omap_cfg_reg);
214 #define omap_mux_init() do {} while(0)
215 #define omap_cfg_reg(x) do {} while(0)
216 #endif /* CONFIG_OMAP_MUX */