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stm32mp1: use OTP to configure MAC address and serial number

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Use OTP57 and 58 for MAC address
- OTP57 = MAC address  bits [31:0]
- OTP58 = MAC address  bit  [47:32] stored in OTP  LSB's

Use manufacture information in OTP13 to OTP15 to build unique
chip id saved in env variable "serial#"
(used for USB device enumeration)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay 2018-05-17 15:24:07 +02:00 committed by Tom Rini
parent c3600e1f92
commit 7f7deb0c72
1 changed files with 83 additions and 2 deletions
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85
arch/arm/mach-stm32mp/cpu.c
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@ -5,9 +5,12 @@
#include <common.h>
#include <clk.h>
#include <debug_uart.h>
#include <environment.h>
#include <misc.h>
#include <asm/io.h>
#include <asm/arch/stm32.h>
#include <asm/arch/sys_proto.h>
#include <dm/device.h>
#include <dm/uclass.h>
/* RCC register */
@ -51,6 +54,10 @@
#define BOOTROM_INSTANCE_MASK GENMASK(31, 16)
#define BOOTROM_INSTANCE_SHIFT 16
/* BSEC OTP index */
#define BSEC_OTP_SERIAL 13
#define BSEC_OTP_MAC 57
#if !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD)
static void security_init(void)
{
@ -274,9 +281,83 @@ static void setup_boot_mode(void)
}
}
int arch_misc_init(void)
/*
* If there is no MAC address in the environment, then it will be initialized
* (silently) from the value in the OTP.
*/
static int setup_mac_address(void)
{
setup_boot_mode();
#if defined(CONFIG_NET)
int ret;
int i;
u32 otp[2];
uchar enetaddr[6];
struct udevice *dev;
/* MAC already in environment */
if (eth_env_get_enetaddr("ethaddr", enetaddr))
return 0;
ret = uclass_get_device_by_driver(UCLASS_MISC,
DM_GET_DRIVER(stm32mp_bsec),
&dev);
if (ret)
return ret;
ret = misc_read(dev, BSEC_OTP_MAC * 4 + STM32_BSEC_OTP_OFFSET,
otp, sizeof(otp));
if (ret)
return ret;
for (i = 0; i < 6; i++)
enetaddr[i] = ((uint8_t *)&otp)[i];
if (!is_valid_ethaddr(enetaddr)) {
pr_err("invalid MAC address in OTP %pM", enetaddr);
return -EINVAL;
}
pr_debug("OTP MAC address = %pM\n", enetaddr);
ret = !eth_env_set_enetaddr("ethaddr", enetaddr);
if (!ret)
pr_err("Failed to set mac address %pM from OTP: %d\n",
enetaddr, ret);
#endif
return 0;
}
static int setup_serial_number(void)
{
char serial_string[25];
u32 otp[3] = {0, 0, 0 };
struct udevice *dev;
int ret;
if (env_get("serial#"))
return 0;
ret = uclass_get_device_by_driver(UCLASS_MISC,
DM_GET_DRIVER(stm32mp_bsec),
&dev);
if (ret)
return ret;
ret = misc_read(dev, BSEC_OTP_SERIAL * 4 + STM32_BSEC_OTP_OFFSET,
otp, sizeof(otp));
if (ret)
return ret;
sprintf(serial_string, "%08x%08x%08x", otp[0], otp[1], otp[2]);
env_set("serial#", serial_string);
return 0;
}
int arch_misc_init(void)
{
setup_boot_mode();
setup_mac_address();
setup_serial_number();
return 0;
}