[ARM] 4303/3: base kernel support for TI DaVinci

Add base kernel support for the TI DaVinci platform.

This patch only includes interrupts, timers, CPU identification,
serial support and basic power and sleep controller init.  More
drivers to come.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 94 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/id.c b/arch/arm/mach-davinci/id.c
new file mode 100644
index 000000000000..70608f76aed8
--- /dev/null
+++ b/arch/arm/mach-davinci/id.c
@@ -0,0 +1,94 @@
+/*
+ * Davinci CPU identification code
+ *
+ * Copyright (C) 2006 Komal Shah <komal_shah802003@yahoo.com>
+ *
+ * Derived from OMAP1 CPU identification code.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+#define JTAG_ID_BASE		0x01c40028
+
+struct davinci_id {
+	u8	variant;	/* JTAG ID bits 31:28 */
+	u16	part_no;	/* JTAG ID bits 27:12 */
+	u32	manufacturer;	/* JTAG ID bits 11:1 */
+	u32	type;		/* Cpu id bits [31:8], cpu class bits [7:0] */
+};
+
+/* Register values to detect the DaVinci version */
+static struct davinci_id davinci_ids[] __initdata = {
+	{
+		/* DM6446 */
+		.part_no      = 0xb700,
+		.variant      = 0x0,
+		.manufacturer = 0x017,
+		.type	      = 0x64460000,
+	},
+};
+
+/*
+ * Get Device Part No. from JTAG ID register
+ */
+static u16 __init davinci_get_part_no(void)
+{
+	u32 dev_id, part_no;
+
+	dev_id = davinci_readl(JTAG_ID_BASE);
+
+	part_no = ((dev_id >> 12) & 0xffff);
+
+	return part_no;
+}
+
+/*
+ * Get Device Revision from JTAG ID register
+ */
+static u8 __init davinci_get_variant(void)
+{
+	u32 variant;
+
+	variant = davinci_readl(JTAG_ID_BASE);
+
+	variant = (variant >> 28) & 0xf;
+
+	return variant;
+}
+
+void __init davinci_check_revision(void)
+{
+	int i;
+	u16 part_no;
+	u8 variant;
+
+	part_no = davinci_get_part_no();
+	variant = davinci_get_variant();
+
+	/* First check only the major version in a safe way */
+	for (i = 0; i < ARRAY_SIZE(davinci_ids); i++) {
+		if (part_no == (davinci_ids[i].part_no)) {
+			system_rev = davinci_ids[i].type;
+			break;
+		}
+	}
+
+	/* Check if we can find the dev revision */
+	for (i = 0; i < ARRAY_SIZE(davinci_ids); i++) {
+		if (part_no == davinci_ids[i].part_no &&
+		    variant == davinci_ids[i].variant) {
+			system_rev = davinci_ids[i].type;
+			break;
+		}
+	}
+
+	printk("DaVinci DM%04x variant 0x%x\n", system_rev >> 16, variant);
+}