summaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap/mux.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mach-omap/mux.c
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/mach-omap/mux.c')
-rw-r--r--arch/arm/mach-omap/mux.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/arch/arm/mach-omap/mux.c b/arch/arm/mach-omap/mux.c
new file mode 100644
index 00000000000..bcf3c6e5ecd
--- /dev/null
+++ b/arch/arm/mach-omap/mux.c
@@ -0,0 +1,163 @@
+/*
+ * linux/arch/arm/mach-omap/mux.c
+ *
+ * Utility to set the Omap MUX and PULL_DWN registers from a table in mux.h
+ *
+ * Copyright (C) 2003 Nokia Corporation
+ *
+ * Written by Tony Lindgren <tony.lindgren@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <linux/spinlock.h>
+
+#define __MUX_C__
+#include <asm/arch/mux.h>
+
+#ifdef CONFIG_OMAP_MUX
+
+/*
+ * Sets the Omap MUX and PULL_DWN registers based on the table
+ */
+int __init_or_module
+omap_cfg_reg(const reg_cfg_t reg_cfg)
+{
+ static DEFINE_SPINLOCK(mux_spin_lock);
+
+ unsigned long flags;
+ reg_cfg_set *cfg;
+ unsigned int reg_orig = 0, reg = 0, pu_pd_orig = 0, pu_pd = 0,
+ pull_orig = 0, pull = 0;
+ unsigned int mask, warn = 0;
+
+ if (reg_cfg > ARRAY_SIZE(reg_cfg_table)) {
+ printk(KERN_ERR "MUX: reg_cfg %d\n", reg_cfg);
+ return -EINVAL;
+ }
+
+ cfg = &reg_cfg_table[reg_cfg];
+
+ /*
+ * We do a pretty long section here with lock on, but pin muxing
+ * should only happen on driver init for each driver, so it's not time
+ * critical.
+ */
+ spin_lock_irqsave(&mux_spin_lock, flags);
+
+ /* Check the mux register in question */
+ if (cfg->mux_reg) {
+ unsigned tmp1, tmp2;
+
+ reg_orig = omap_readl(cfg->mux_reg);
+
+ /* The mux registers always seem to be 3 bits long */
+ mask = (0x7 << cfg->mask_offset);
+ tmp1 = reg_orig & mask;
+ reg = reg_orig & ~mask;
+
+ tmp2 = (cfg->mask << cfg->mask_offset);
+ reg |= tmp2;
+
+ if (tmp1 != tmp2)
+ warn = 1;
+
+ omap_writel(reg, cfg->mux_reg);
+ }
+
+ /* Check for pull up or pull down selection on 1610 */
+ if (!cpu_is_omap1510()) {
+ if (cfg->pu_pd_reg && cfg->pull_val) {
+ pu_pd_orig = omap_readl(cfg->pu_pd_reg);
+ mask = 1 << cfg->pull_bit;
+
+ if (cfg->pu_pd_val) {
+ if (!(pu_pd_orig & mask))
+ warn = 1;
+ /* Use pull up */
+ pu_pd = pu_pd_orig | mask;
+ } else {
+ if (pu_pd_orig & mask)
+ warn = 1;
+ /* Use pull down */
+ pu_pd = pu_pd_orig & ~mask;
+ }
+ omap_writel(pu_pd, cfg->pu_pd_reg);
+ }
+ }
+
+ /* Check for an associated pull down register */
+ if (cfg->pull_reg) {
+ pull_orig = omap_readl(cfg->pull_reg);
+ mask = 1 << cfg->pull_bit;
+
+ if (cfg->pull_val) {
+ if (pull_orig & mask)
+ warn = 1;
+ /* Low bit = pull enabled */
+ pull = pull_orig & ~mask;
+ } else {
+ if (!(pull_orig & mask))
+ warn = 1;
+ /* High bit = pull disabled */
+ pull = pull_orig | mask;
+ }
+
+ omap_writel(pull, cfg->pull_reg);
+ }
+
+ if (warn) {
+#ifdef CONFIG_OMAP_MUX_WARNINGS
+ printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
+#endif
+ }
+
+#ifdef CONFIG_OMAP_MUX_DEBUG
+ if (cfg->debug || warn) {
+ printk("MUX: Setting register %s\n", cfg->name);
+ printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
+ cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
+
+ if (!cpu_is_omap1510()) {
+ if (cfg->pu_pd_reg && cfg->pull_val) {
+ printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
+ cfg->pu_pd_name, cfg->pu_pd_reg,
+ pu_pd_orig, pu_pd);
+ }
+ }
+
+ if (cfg->pull_reg)
+ printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
+ cfg->pull_name, cfg->pull_reg, pull_orig, pull);
+ }
+#endif
+
+ spin_unlock_irqrestore(&mux_spin_lock, flags);
+
+#ifdef CONFIG_OMAP_MUX_ERRORS
+ return warn ? -ETXTBSY : 0;
+#else
+ return 0;
+#endif
+}
+
+EXPORT_SYMBOL(omap_cfg_reg);
+
+#endif /* CONFIG_OMAP_MUX */