1 files changed, 99 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/mux.c b/arch/arm/mach-davinci/mux.c
new file mode 100644
index 0000000000..37de35eb6e
--- /dev/null
+++ b/arch/arm/mach-davinci/mux.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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.
+ *
+ * Copyright (C) 2008 Texas Instruments.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+
+#include "mux.h"
+#include "common.h"
+
+static void __iomem *pinmux_base;
+
+/*
+ * Sets the DAVINCI MUX register based on the table
+ */
+int 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) {
+		pr_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) {
+		pr_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
+		pr_warn("initialized %s\n", cfg->name);
+#endif
+	}
+
+#ifdef CONFIG_DAVINCI_MUX_DEBUG
+	if (cfg->debug || warn) {
+		pr_warn("Setting register %s\n", cfg->name);
+		pr_warn("   %s (0x%08x) = 0x%08x -> 0x%08x\n",
+			cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
+	}
+#endif
+
+	return 0;
+}