117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
/*
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* Davinci CPU identification code
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*
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* Copyright (C) 2006 Komal Shah <komal_shah802003@yahoo.com>
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*
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* Derived from OMAP1 CPU identification code.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#define JTAG_ID_BASE 0x01c40028
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static unsigned int davinci_revision;
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struct davinci_id {
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u8 variant; /* JTAG ID bits 31:28 */
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u16 part_no; /* JTAG ID bits 27:12 */
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u32 manufacturer; /* JTAG ID bits 11:1 */
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u32 type; /* Cpu id bits [31:8], cpu class bits [7:0] */
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};
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/* Register values to detect the DaVinci version */
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static struct davinci_id davinci_ids[] __initdata = {
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{
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/* DM6446 */
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.part_no = 0xb700,
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.variant = 0x0,
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.manufacturer = 0x017,
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.type = 0x64460000,
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},
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{
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/* DM646X */
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.part_no = 0xb770,
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.variant = 0x0,
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.manufacturer = 0x017,
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.type = 0x64670000,
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},
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{
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/* DM355 */
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.part_no = 0xb73b,
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.variant = 0x0,
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.manufacturer = 0x00f,
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.type = 0x03550000,
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},
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};
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/*
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* Get Device Part No. from JTAG ID register
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*/
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static u16 __init davinci_get_part_no(void)
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{
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u32 dev_id, part_no;
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dev_id = davinci_readl(JTAG_ID_BASE);
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part_no = ((dev_id >> 12) & 0xffff);
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return part_no;
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}
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/*
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* Get Device Revision from JTAG ID register
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*/
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static u8 __init davinci_get_variant(void)
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{
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u32 variant;
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variant = davinci_readl(JTAG_ID_BASE);
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variant = (variant >> 28) & 0xf;
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return variant;
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}
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unsigned int davinci_rev(void)
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{
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return davinci_revision >> 16;
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}
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EXPORT_SYMBOL(davinci_rev);
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void __init davinci_check_revision(void)
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{
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int i;
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u16 part_no;
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u8 variant;
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part_no = davinci_get_part_no();
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variant = davinci_get_variant();
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/* First check only the major version in a safe way */
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for (i = 0; i < ARRAY_SIZE(davinci_ids); i++) {
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if (part_no == (davinci_ids[i].part_no)) {
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davinci_revision = davinci_ids[i].type;
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break;
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}
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}
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/* Check if we can find the dev revision */
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for (i = 0; i < ARRAY_SIZE(davinci_ids); i++) {
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if (part_no == davinci_ids[i].part_no &&
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variant == davinci_ids[i].variant) {
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davinci_revision = davinci_ids[i].type;
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break;
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}
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}
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printk(KERN_INFO "DaVinci DM%04x variant 0x%x\n",
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davinci_rev(), variant);
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}
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