davinci: Support JTAG ID register at any address

The Davinci cpu_is_davinci_*() macros use the SoC part number
and variant retrieved from the JTAG ID register to determine the
type of cpu that the kernel is running on.  Currently, the code to
read the JTAG ID register assumes that the register is always at
the same base address.  This isn't true on some newer SoCs.

To solve this, have the SoC-specific code set the JTAG ID register
base address in soc_info structure and add a 'cpu_id' member to it.
'cpu_id' will be used by the cpu_is_davinci_*() macros to match
the cpu id.  Also move the info used to identify the cpu type into
the SoC-specific code to keep all SoC-specific code together.

The common code will read the JTAG ID register, search through
an array of davinci_id structures to identify the cpu type.
Once identified, it will set the 'cpu_id' member of the soc_info
structure to the proper value and the cpu_is_davinci_*() macros
will now work.

Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 0 insertions, 116 deletions

diff --git a/arch/arm/mach-davinci/id.c b/arch/arm/mach-davinci/id.c
deleted file mode 100644
index 018b994..0000000
--- a/arch/arm/mach-davinci/id.c
+++ /dev/null
@@ -1,116 +0,0 @@
-/*
- * 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 <linux/io.h>
-
-#define JTAG_ID_BASE		IO_ADDRESS(0x01c40028)
-
-static unsigned int davinci_revision;
-
-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,
-	},
-	{
-		/* DM646X */
-		.part_no      = 0xb770,
-		.variant      = 0x0,
-		.manufacturer = 0x017,
-		.type         = 0x64670000,
-	},
-	{
-		/* DM355 */
-		.part_no	= 0xb73b,
-		.variant	= 0x0,
-		.manufacturer	= 0x00f,
-		.type		= 0x03550000,
-	},
-};
-
-/*
- * Get Device Part No. from JTAG ID register
- */
-static u16 __init davinci_get_part_no(void)
-{
-	u32 dev_id, part_no;
-
-	dev_id = __raw_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 = __raw_readl(JTAG_ID_BASE);
-
-	variant = (variant >> 28) & 0xf;
-
-	return variant;
-}
-
-unsigned int davinci_rev(void)
-{
-	return davinci_revision >> 16;
-}
-EXPORT_SYMBOL(davinci_rev);
-
-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)) {
-			davinci_revision = 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) {
-			davinci_revision = davinci_ids[i].type;
-			break;
-		}
-	}
-
-	printk(KERN_INFO "DaVinci DM%04x variant 0x%x\n",
-	       davinci_rev(), variant);
-}