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-rw-r--r--arch/arm/mach-davinci/mux.c100
1 files changed, 81 insertions, 19 deletions
diff --git a/arch/arm/mach-davinci/mux.c b/arch/arm/mach-davinci/mux.c
index 8ff9d8a..bbba0b2 100644
--- a/arch/arm/mach-davinci/mux.c
+++ b/arch/arm/mach-davinci/mux.c
@@ -1,41 +1,103 @@
/*
- * DaVinci pin multiplexing configurations
+ * Utility to set the DAVINCI MUX register from a table in mux.h
*
* Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
*
+ * Based on linux/arch/arm/plat-omap/mux.c:
+ * Copyright (C) 2003 - 2005 Nokia Corporation
+ *
+ * Written by Tony Lindgren
+ *
* 2007 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
+ *
+ * Copyright (C) 2008 Texas Instruments.
*/
#include <linux/io.h>
+#include <linux/module.h>
#include <linux/spinlock.h>
#include <mach/hardware.h>
-
#include <mach/mux.h>
-/* System control register offsets */
-#define PINMUX0 0x00
-#define PINMUX1 0x04
+static const struct mux_config *mux_table;
+static unsigned long pin_table_sz;
+
+int __init davinci_mux_register(const struct mux_config *pins,
+ unsigned long size)
+{
+ mux_table = pins;
+ pin_table_sz = size;
-static DEFINE_SPINLOCK(mux_lock);
+ return 0;
+}
-void davinci_mux_peripheral(unsigned int mux, unsigned int enable)
+/*
+ * Sets the DAVINCI MUX register based on the table
+ */
+int __init_or_module davinci_cfg_reg(const unsigned long index)
{
- u32 pinmux, muxreg = PINMUX0;
+ static DEFINE_SPINLOCK(mux_spin_lock);
+ void __iomem *base = IO_ADDRESS(DAVINCI_SYSTEM_MODULE_BASE);
+ unsigned long flags;
+ const struct mux_config *cfg;
+ unsigned int reg_orig = 0, reg = 0;
+ unsigned int mask, warn = 0;
+
+ if (!mux_table)
+ BUG();
+
+ if (index >= pin_table_sz) {
+ printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
+ index, pin_table_sz);
+ dump_stack();
+ return -ENODEV;
+ }
+
+ cfg = &mux_table[index];
+
+ if (cfg->name == NULL) {
+ printk(KERN_ERR "No entry for the specified index\n");
+ return -ENODEV;
+ }
+
+ /* Update the mux register in question */
+ if (cfg->mask) {
+ unsigned tmp1, tmp2;
+
+ spin_lock_irqsave(&mux_spin_lock, flags);
+ reg_orig = __raw_readl(base + cfg->mux_reg);
+
+ mask = (cfg->mask << cfg->mask_offset);
+ tmp1 = reg_orig & mask;
+ reg = reg_orig & ~mask;
+
+ tmp2 = (cfg->mode << cfg->mask_offset);
+ reg |= tmp2;
+
+ if (tmp1 != tmp2)
+ warn = 1;
+
+ __raw_writel(reg, base + cfg->mux_reg);
+ spin_unlock_irqrestore(&mux_spin_lock, flags);
+ }
+
+ if (warn) {
+#ifdef CONFIG_DAVINCI_MUX_WARNINGS
+ printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
+#endif
+ }
- if (mux >= DAVINCI_MUX_LEVEL2) {
- muxreg = PINMUX1;
- mux -= DAVINCI_MUX_LEVEL2;
+#ifdef CONFIG_DAVINCI_MUX_DEBUG
+ if (cfg->debug || warn) {
+ printk(KERN_WARNING "MUX: Setting register %s\n", cfg->name);
+ printk(KERN_WARNING " %s (0x%08x) = 0x%08x -> 0x%08x\n",
+ cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
}
+#endif
- spin_lock(&mux_lock);
- pinmux = davinci_readl(DAVINCI_SYSTEM_MODULE_BASE + muxreg);
- if (enable)
- pinmux |= (1 << mux);
- else
- pinmux &= ~(1 << mux);
- davinci_writel(pinmux, DAVINCI_SYSTEM_MODULE_BASE + muxreg);
- spin_unlock(&mux_lock);
+ return 0;
}
+EXPORT_SYMBOL(davinci_cfg_reg);
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