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rockchip: board: puma_rk3399: add support for serial# and cpuid# via efuses

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With our efuse driver for the RK3399 ready, we can add the
board-specific code that consumes the cpuid from the efuse block and
postprocesses it into the system serial (using the same CRC32 based
derivation as in Linux).

We expose the cpuid via two distinct environment variables:
   serial# - the serial number, as derived in Linux
   cpuid#  - the raw 16 byte CPU id field from the fuse block

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Philipp Tomsich 2017-05-05 19:21:39 +02:00 committed by Simon Glass
parent 49cd8e85eb
commit 9415b9a7d8
2 changed files with 84 additions and 0 deletions
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80
board/theobroma-systems/puma_rk3399/puma-rk3399.c
View file

@ -9,10 +9,15 @@
#include <ram.h>
#include <dm/pinctrl.h>
#include <dm/uclass-internal.h>
#include <misc.h>
#include <asm/setup.h>
#include <asm/arch/periph.h>
#include <power/regulator.h>
#include <u-boot/sha256.h>
#define RK3399_CPUID_OFF 0x7
#define RK3399_CPUID_LEN 0x10
DECLARE_GLOBAL_DATA_PTR;
#define RK3399_CPUID_OFF 0x7
@ -63,6 +68,81 @@ out:
return 0;
}
static void setup_serial(void)
{
#if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
struct udevice *dev;
int ret, i;
u8 cpuid[RK3399_CPUID_LEN];
u8 low[RK3399_CPUID_LEN/2], high[RK3399_CPUID_LEN/2];
char cpuid_str[RK3399_CPUID_LEN * 2 + 1];
u64 serialno;
char serialno_str[16];
/* the first misc device will be used */
ret = uclass_get_device(UCLASS_MISC, 0, &dev);
if (ret) {
debug("%s: could not find efuse device\n", __func__);
return;
}
/* read the cpu_id range from the efuses */
ret = misc_read(dev, RK3399_CPUID_OFF, &cpuid, sizeof(cpuid));
if (ret) {
debug("%s: reading cpuid from the efuses failed\n",
__func__);
return;
}
memset(cpuid_str, 0, sizeof(cpuid_str));
for (i = 0; i < 16; i++)
sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]);
debug("cpuid: %s\n", cpuid_str);
/*
* Mix the cpuid bytes using the same rules as in
* ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
*/
for (i = 0; i < 8; i++) {
low[i] = cpuid[1 + (i << 1)];
high[i] = cpuid[i << 1];
}
serialno = crc32_no_comp(0, low, 8);
serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
snprintf(serialno_str, sizeof(serialno_str), "%llx", serialno);
setenv("cpuid#", cpuid_str);
setenv("serial#", serialno_str);
#endif
return;
}
int misc_init_r(void)
{
setup_serial();
return 0;
}
#ifdef CONFIG_SERIAL_TAG
void get_board_serial(struct tag_serialnr *serialnr)
{
char *serial_string;
u64 serial = 0;
serial_string = getenv("serial#");
if (serial_string)
serial = simple_strtoull(serial_string, NULL, 16);
serialnr->high = (u32)(serial >> 32);
serialnr->low = (u32)(serial & 0xffffffff);
}
#endif
int dram_init(void)
{
struct ram_info ram;

4
include/configs/puma_rk3399.h
View file

@ -22,4 +22,8 @@
#define SDRAM_BANK_SIZE (2UL << 30)
#define CONFIG_MISC_INIT_R
#define CONFIG_SERIAL_TAG
#define CONFIG_ENV_OVERWRITE
#endif