https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 13d428afc007fcfcd6deeb215618f54cf9c0cae6 authored by Linus Torvalds on 20 November 2008, 23:19:22 UTC
Linux 2.6.28-rc6
Linux 2.6.28-rc6
Tip revision: 13d428a
id.c
/*
* 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 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);
}