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/* SPDX-License-Identifier: GPL-2.0+ */
#include <linux/types.h>
#include <dm.h>
#include <spi.h>
#include <log.h>
#include <net.h>
#include <u-boot/crc.h>
#include "sys_otp.h"
#define OTP_DEVICE_BUS 0
#define OTP_DEVICE_CS 0
#define MAX_NUM_PORTS 2
enum board_variant {
BOARD_VARIANT_INVALID = 0,
BOARD_VARIANT_ENG_SAMPLE,
BOARD_VARIANT_4G_PROD_NO_ECC,
BOARD_VARIANT_MAX
};
struct __attribute__ ((__packed__)) otp_data_t {
u8 magic[8];
u8 part_num[16];
u8 variant;
u8 revision;
u8 serial_num[6];
u8 mfg_year[2];
u8 mfg_month;
u8 mfg_day;
u8 mac_addr[MAX_NUM_PORTS][6];
u8 reserved[204];
u32 checksum;
} otp;
static struct spi_slave *slave;
static int has_been_read = 0;
static int data_valid = 0;
static inline int is_data_valid(void)
{
return data_valid;
}
static inline int is_valid_header(void)
{
if ((otp.magic[0] == 'H') || (otp.magic[1] == '6') ||
(otp.magic[2] == '4') || (otp.magic[3] == 'N') ||
(otp.magic[4] == 'P') || (otp.magic[5] == 'V') ||
(otp.magic[6] == '1') || (otp.magic[7] == 0))
return 1;
return 0;
}
static int init_system_otp(int bus, int cs)
{
int ret;
char name[30], *str;
struct udevice *dev;
snprintf(name, sizeof(name), "generic_%d:%d", bus, cs);
str = strdup(name);
if (!str)
return -ENOMEM;
ret = spi_get_bus_and_cs(bus, cs, 25000000, CONFIG_DEFAULT_SPI_MODE, "spi_generic_drv",
str, &dev, &slave);
return ret;
}
#ifdef DEBUG
/**
* show_otp_data - display the contents of the OTP register
*/
static void show_otp_data(void)
{
u32 i;
u32 crc;
const char* var_str[BOARD_VARIANT_MAX] = {
"Invalid variant",
"Engineering Sample",
"Production - 4GB non ECC"
};
printf("\n");
printf("Register dump: (%lu bytes)\n", sizeof(otp));
for (i = 0; i < sizeof(otp); i++) {
if ((i % 16) == 0)
printf("%02X: ", i);
printf("%02X ", ((u8 *)&otp)[i]);
if (((i % 16) == 15) || (i == sizeof(otp) - 1))
printf("\n");
}
if (!is_valid_header())
return;
printf("Part Number: %s\n", otp.part_num);
printf("Variant: %s\n", var_str[otp.variant]);
printf("Revision: %x.%x\n", (otp.revision & 0xf0) >> 4, otp.revision & 0x0f);
printf("Serial Number: %012llx\n", *((uint64_t*) otp.serial_num) &
0xFFFFFFFFFFFF);
printf("Manufacturing Date: %02X-%02X-%04X (DD-MM-YYYY)\n", otp.mfg_day,
otp.mfg_month, *(u16*) otp.mfg_year);
printf("1GbE MAC Address: %02X:%02X:%02X:%02X:%02X:%02X\n",
otp.mac_addr[0][0], otp.mac_addr[0][1], otp.mac_addr[0][2],
otp.mac_addr[0][3], otp.mac_addr[0][4], otp.mac_addr[0][5]);
printf("2.5GbE MAC Address: %02X:%02X:%02X:%02X:%02X:%02X\n",
otp.mac_addr[1][0], otp.mac_addr[1][1], otp.mac_addr[1][2],
otp.mac_addr[1][3], otp.mac_addr[1][4], otp.mac_addr[1][5]);
crc = crc32(0, (void *)&otp, sizeof(otp) - 4);
if (crc == le32_to_cpu(otp.checksum))
printf("CRC: %08x\n\n", le32_to_cpu(otp.checksum));
else
printf("CRC: %08x (should be %08x)\n\n",
le32_to_cpu(otp.checksum), crc);
}
#endif
int read_otp_data(void)
{
int ret;
u8 dout[5];
if (has_been_read) {
if (is_data_valid())
return 0;
else
goto data_invalid;
}
ret = init_system_otp(OTP_DEVICE_BUS, OTP_DEVICE_CS);
if (ret)
return ret;
ret = spi_claim_bus(slave);
if (ret) {
debug("SPI: Failed to claim SPI bus: %d\n", ret);
return ret;
}
dout[0] = 0x48;
dout[1] = 0x00;
dout[2] = 0x10; /* Security Register #1 */
dout[3] = 0x00;
dout[4] = 0x00; /* Dummy Byte */
ret = spi_write_then_read(slave, dout, sizeof(dout), NULL, (u8 *)&otp,
sizeof(otp));
spi_release_bus(slave);
#ifdef DEBUG
show_otp_data();
#endif
has_been_read = (ret == 0) ? 1 : 0;
if (!is_valid_header())
goto data_invalid;
if (crc32(0, (void *)&otp, sizeof(otp) - 4) ==
le32_to_cpu(otp.checksum))
data_valid = 1;
if (!is_data_valid())
goto data_invalid;
return 0;
data_invalid:
printf("Invalid board ID data!\n");
return -1;
}
int get_revision(int *major, int *minor)
{
if (!is_data_valid())
return -1;
*major = (otp.revision & 0xf0) >> 4;
*minor = otp.revision & 0x0f;
return 0;
}
const char *get_variant(void)
{
const char* var_str[BOARD_VARIANT_MAX] = {
"Unknown",
"Engineering Sample",
"4GB non ECC"
};
if ((otp.variant < BOARD_VARIANT_ENG_SAMPLE) ||
(otp.variant >= BOARD_VARIANT_MAX))
return var_str[0];
return var_str[otp.variant];
}
void set_board_info(void)
{
char env_str[13];
if (!is_data_valid())
return;
snprintf(env_str, sizeof(env_str), "%i.%i", (otp.revision & 0xf0) >> 4, otp.revision & 0x0f);
env_set("board_rev", env_str);
sprintf(env_str, "%012llx", *((uint64_t*) otp.serial_num) &
0xFFFFFFFFFFFF);
env_set("serial#", env_str);
}
int mac_read_from_otp(void)
{
unsigned int i;
int ret;
if (!is_data_valid())
return -1;
for (i = 0; i < MAX_NUM_PORTS; i++) {
char enetvar[9];
sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
if (!is_valid_ethaddr(otp.mac_addr[i])) {
debug("Not valid %s!\n", enetvar);
continue;
}
/* Only initialize environment variables that are blank
* (i.e. have not yet been set)
*/
if (!env_get(enetvar))
eth_env_set_enetaddr(enetvar, otp.mac_addr[i]);
}
return ret;
}
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