davinci: update pin-multiplexing support

Update MUX support to be more general and useful across multiple
SoCs in the DaVinci family.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 80 insertions, 19 deletions

diff --git a/arch/arm/mach-davinci/mux.c b/arch/arm/mach-davinci/mux.c
index 53734dee1f93..bbba0b247a44 100644
--- a/arch/arm/mach-davinci/mux.c
+++ b/arch/arm/mach-davinci/mux.c
@@ -1,42 +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)
 {
+	static DEFINE_SPINLOCK(mux_spin_lock);
 	void __iomem *base = IO_ADDRESS(DAVINCI_SYSTEM_MODULE_BASE);
-	u32 pinmux, muxreg = PINMUX0;
+	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 = __raw_readl(base + muxreg);
-	if (enable)
-		pinmux |= (1 << mux);
-	else
-		pinmux &= ~(1 << mux);
-	__raw_writel(pinmux, base + muxreg);
-	spin_unlock(&mux_lock);
+	return 0;
 }
+EXPORT_SYMBOL(davinci_cfg_reg);