zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/mach-davinci/mux.c b/ap/os/linux/linux-3.4.x/arch/arm/mach-davinci/mux.c
new file mode 100644
index 0000000..f34a8dc
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/mach-davinci/mux.c
@@ -0,0 +1,113 @@
+/*
+ * 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/mux.h>
+#include <mach/common.h>
+
+static void __iomem *pinmux_base;
+
+/*
+ * 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);
+ struct davinci_soc_info *soc_info = &davinci_soc_info;
+ unsigned long flags;
+ const struct mux_config *cfg;
+ unsigned int reg_orig = 0, reg = 0;
+ unsigned int mask, warn = 0;
+
+ if (WARN_ON(!soc_info->pinmux_pins))
+ return -ENODEV;
+
+ if (!pinmux_base) {
+ pinmux_base = ioremap(soc_info->pinmux_base, SZ_4K);
+ if (WARN_ON(!pinmux_base))
+ return -ENOMEM;
+ }
+
+ if (index >= soc_info->pinmux_pins_num) {
+ printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
+ index, soc_info->pinmux_pins_num);
+ dump_stack();
+ return -ENODEV;
+ }
+
+ cfg = &soc_info->pinmux_pins[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(pinmux_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, pinmux_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
+ }
+
+#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
+
+ return 0;
+}
+EXPORT_SYMBOL(davinci_cfg_reg);
+
+int __init_or_module davinci_cfg_reg_list(const short pins[])
+{
+ int i, error = -EINVAL;
+
+ if (pins)
+ for (i = 0; pins[i] >= 0; i++) {
+ error = davinci_cfg_reg(pins[i]);
+ if (error)
+ break;
+ }
+
+ return error;
+}