95 lines
2 KiB
C
95 lines
2 KiB
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 <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);
|
||
|
}
|