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u-boot/board/freescale/common/sys_eeprom.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

542 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2006, 2008-2009, 2011 Freescale Semiconductor
* York Sun (yorksun@freescale.com)
* Haiying Wang (haiying.wang@freescale.com)
* Timur Tabi (timur@freescale.com)
*/
#include <common.h>
#include <command.h>
#include <i2c.h>
#include <linux/ctype.h>
#ifdef CONFIG_SYS_I2C_EEPROM_CCID
#include "../common/eeprom.h"
#define MAX_NUM_PORTS 8
#endif
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
/* some boards with non-256-bytes EEPROM have special define */
/* for MAX_NUM_PORTS in board-specific file */
#ifndef MAX_NUM_PORTS
#define MAX_NUM_PORTS 16
#endif
#define NXID_VERSION 1
#endif
/**
* static eeprom: EEPROM layout for CCID or NXID formats
*
* See application note AN3638 for details.
*/
static struct __attribute__ ((__packed__)) eeprom {
#ifdef CONFIG_SYS_I2C_EEPROM_CCID
u8 id[4]; /* 0x00 - 0x03 EEPROM Tag 'CCID' */
u8 major; /* 0x04 Board revision, major */
u8 minor; /* 0x05 Board revision, minor */
u8 sn[10]; /* 0x06 - 0x0F Serial Number*/
u8 errata[2]; /* 0x10 - 0x11 Errata Level */
u8 date[6]; /* 0x12 - 0x17 Build Date */
u8 res_0[40]; /* 0x18 - 0x3f Reserved */
u8 mac_count; /* 0x40 Number of MAC addresses */
u8 mac_flag; /* 0x41 MAC table flags */
u8 mac[MAX_NUM_PORTS][6]; /* 0x42 - 0x71 MAC addresses */
u32 crc; /* 0x72 CRC32 checksum */
#endif
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
u8 id[4]; /* 0x00 - 0x03 EEPROM Tag 'NXID' */
u8 sn[12]; /* 0x04 - 0x0F Serial Number */
u8 errata[5]; /* 0x10 - 0x14 Errata Level */
u8 date[6]; /* 0x15 - 0x1a Build Date */
u8 res_0; /* 0x1b Reserved */
u32 version; /* 0x1c - 0x1f NXID Version */
u8 tempcal[8]; /* 0x20 - 0x27 Temperature Calibration Factors */
u8 tempcalsys[2]; /* 0x28 - 0x29 System Temperature Calibration Factors */
u8 tempcalflags; /* 0x2a Temperature Calibration Flags */
u8 res_1[21]; /* 0x2b - 0x3f Reserved */
u8 mac_count; /* 0x40 Number of MAC addresses */
u8 mac_flag; /* 0x41 MAC table flags */
u8 mac[MAX_NUM_PORTS][6]; /* 0x42 - 0xa1 MAC addresses */
u8 res_2[90]; /* 0xa2 - 0xfb Reserved */
u32 crc; /* 0xfc - 0xff CRC32 checksum */
#endif
} e;
/* Set to 1 if we've read EEPROM into memory */
static int has_been_read = 0;
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
/* Is this a valid NXID EEPROM? */
#define is_valid ((e.id[0] == 'N') || (e.id[1] == 'X') || \
(e.id[2] == 'I') || (e.id[3] == 'D'))
#endif
#ifdef CONFIG_SYS_I2C_EEPROM_CCID
/* Is this a valid CCID EEPROM? */
#define is_valid ((e.id[0] == 'C') || (e.id[1] == 'C') || \
(e.id[2] == 'I') || (e.id[3] == 'D'))
#endif
/**
* show_eeprom - display the contents of the EEPROM
*/
static void show_eeprom(void)
{
int i;
unsigned int crc;
/* EEPROM tag ID, either CCID or NXID */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
printf("ID: %c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
be32_to_cpu(e.version));
#else
printf("ID: %c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
#endif
/* Serial number */
printf("SN: %s\n", e.sn);
/* Errata level. */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
printf("Errata: %s\n", e.errata);
#else
printf("Errata: %c%c\n",
e.errata[0] ? e.errata[0] : '.',
e.errata[1] ? e.errata[1] : '.');
#endif
/* Build date, BCD date values, as YYMMDDhhmmss */
printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
e.date[0], e.date[1], e.date[2],
e.date[3] & 0x7F, e.date[4], e.date[5],
e.date[3] & 0x80 ? "PM" : "");
/* Show MAC addresses */
for (i = 0; i < min(e.mac_count, (u8)MAX_NUM_PORTS); i++) {
u8 *p = e.mac[i];
printf("Eth%u: %02x:%02x:%02x:%02x:%02x:%02x\n", i,
p[0], p[1], p[2], p[3], p[4], p[5]);
}
crc = crc32(0, (void *)&e, sizeof(e) - 4);
if (crc == be32_to_cpu(e.crc))
printf("CRC: %08x\n", be32_to_cpu(e.crc));
else
printf("CRC: %08x (should be %08x)\n",
be32_to_cpu(e.crc), crc);
#ifdef DEBUG
printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
for (i = 0; i < sizeof(e); i++) {
if ((i % 16) == 0)
printf("%02X: ", i);
printf("%02X ", ((u8 *)&e)[i]);
if (((i % 16) == 15) || (i == sizeof(e) - 1))
printf("\n");
}
#endif
}
/**
* read_eeprom - read the EEPROM into memory
*/
static int read_eeprom(void)
{
int ret;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
unsigned int bus;
#endif
if (has_been_read)
return 0;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
bus = i2c_get_bus_num();
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif
ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
(void *)&e, sizeof(e));
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
i2c_set_bus_num(bus);
#endif
#ifdef DEBUG
show_eeprom();
#endif
has_been_read = (ret == 0) ? 1 : 0;
return ret;
}
/**
* update_crc - update the CRC
*
* This function should be called after each update to the EEPROM structure,
* to make sure the CRC is always correct.
*/
static void update_crc(void)
{
u32 crc;
crc = crc32(0, (void *)&e, sizeof(e) - 4);
e.crc = cpu_to_be32(crc);
}
/**
* prog_eeprom - write the EEPROM from memory
*/
static int prog_eeprom(void)
{
int ret = 0;
int i;
void *p;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
unsigned int bus;
#endif
/* Set the reserved values to 0xFF */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
e.res_0 = 0xFF;
memset(e.res_1, 0xFF, sizeof(e.res_1));
#else
memset(e.res_0, 0xFF, sizeof(e.res_0));
#endif
update_crc();
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
bus = i2c_get_bus_num();
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif
/*
* The AT24C02 datasheet says that data can only be written in page
* mode, which means 8 bytes at a time, and it takes up to 5ms to
* complete a given write.
*/
for (i = 0, p = &e; i < sizeof(e); i += 8, p += 8) {
ret = i2c_write(CONFIG_SYS_I2C_EEPROM_ADDR, i, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
p, min((int)(sizeof(e) - i), 8));
if (ret)
break;
udelay(5000); /* 5ms write cycle timing */
}
if (!ret) {
/* Verify the write by reading back the EEPROM and comparing */
struct eeprom e2;
ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN, (void *)&e2, sizeof(e2));
if (!ret && memcmp(&e, &e2, sizeof(e)))
ret = -1;
}
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
i2c_set_bus_num(bus);
#endif
if (ret) {
printf("Programming failed.\n");
has_been_read = 0;
return -1;
}
printf("Programming passed.\n");
return 0;
}
/**
* h2i - converts hex character into a number
*
* This function takes a hexadecimal character (e.g. '7' or 'C') and returns
* the integer equivalent.
*/
static inline u8 h2i(char p)
{
if ((p >= '0') && (p <= '9'))
return p - '0';
if ((p >= 'A') && (p <= 'F'))
return (p - 'A') + 10;
if ((p >= 'a') && (p <= 'f'))
return (p - 'a') + 10;
return 0;
}
/**
* set_date - stores the build date into the EEPROM
*
* This function takes a pointer to a string in the format "YYMMDDhhmmss"
* (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
* and stores it in the build date field of the EEPROM local copy.
*/
static void set_date(const char *string)
{
unsigned int i;
if (strlen(string) != 12) {
printf("Usage: mac date YYMMDDhhmmss\n");
return;
}
for (i = 0; i < 6; i++)
e.date[i] = h2i(string[2 * i]) << 4 | h2i(string[2 * i + 1]);
update_crc();
}
/**
* set_mac_address - stores a MAC address into the EEPROM
*
* This function takes a pointer to MAC address string
* (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
* stores it in one of the MAC address fields of the EEPROM local copy.
*/
static void set_mac_address(unsigned int index, const char *string)
{
char *p = (char *) string;
unsigned int i;
if ((index >= MAX_NUM_PORTS) || !string) {
printf("Usage: mac <n> XX:XX:XX:XX:XX:XX\n");
return;
}
for (i = 0; *p && (i < 6); i++) {
e.mac[index][i] = simple_strtoul(p, &p, 16);
if (*p == ':')
p++;
}
update_crc();
}
int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char cmd;
if (argc == 1) {
show_eeprom();
return 0;
}
cmd = argv[1][0];
if (cmd == 'r') {
read_eeprom();
return 0;
}
if (cmd == 'i') {
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
memcpy(e.id, "NXID", sizeof(e.id));
e.version = cpu_to_be32(NXID_VERSION);
#else
memcpy(e.id, "CCID", sizeof(e.id));
#endif
update_crc();
return 0;
}
if (!is_valid) {
printf("Please read the EEPROM ('r') and/or set the ID ('i') first.\n");
return 0;
}
if (argc == 2) {
switch (cmd) {
case 's': /* save */
prog_eeprom();
break;
default:
return cmd_usage(cmdtp);
}
return 0;
}
/* We know we have at least one parameter */
switch (cmd) {
case 'n': /* serial number */
memset(e.sn, 0, sizeof(e.sn));
strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
update_crc();
break;
case 'e': /* errata */
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
memset(e.errata, 0, 5);
strncpy((char *)e.errata, argv[2], 4);
#else
e.errata[0] = argv[2][0];
e.errata[1] = argv[2][1];
#endif
update_crc();
break;
case 'd': /* date BCD format YYMMDDhhmmss */
set_date(argv[2]);
break;
case 'p': /* MAC table size */
e.mac_count = simple_strtoul(argv[2], NULL, 16);
update_crc();
break;
case '0' ... '9': /* "mac 0" through "mac 22" */
set_mac_address(simple_strtoul(argv[1], NULL, 10), argv[2]);
break;
case 'h': /* help */
default:
return cmd_usage(cmdtp);
}
return 0;
}
/**
* mac_read_from_eeprom - read the MAC addresses from EEPROM
*
* This function reads the MAC addresses from EEPROM and sets the
* appropriate environment variables for each one read.
*
* The environment variables are only set if they haven't been set already.
* This ensures that any user-saved variables are never overwritten.
*
* This function must be called after relocation.
*
* For NXID v1 EEPROMs, we support loading and up-converting the older NXID v0
* format. In a v0 EEPROM, there are only eight MAC addresses and the CRC is
* located at a different offset.
*/
int mac_read_from_eeprom(void)
{
unsigned int i;
u32 crc, crc_offset = offsetof(struct eeprom, crc);
u32 *crcp; /* Pointer to the CRC in the data read from the EEPROM */
puts("EEPROM: ");
if (read_eeprom()) {
printf("Read failed.\n");
return 0;
}
if (!is_valid) {
printf("Invalid ID (%02x %02x %02x %02x)\n",
e.id[0], e.id[1], e.id[2], e.id[3]);
return 0;
}
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
/*
* If we've read an NXID v0 EEPROM, then we need to set the CRC offset
* to where it is in v0.
*/
if (e.version == 0)
crc_offset = 0x72;
#endif
crc = crc32(0, (void *)&e, crc_offset);
crcp = (void *)&e + crc_offset;
if (crc != be32_to_cpu(*crcp)) {
printf("CRC mismatch (%08x != %08x)\n", crc, be32_to_cpu(e.crc));
return 0;
}
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
/*
* MAC address #9 in v1 occupies the same position as the CRC in v0.
* Erase it so that it's not mistaken for a MAC address. We'll
* update the CRC later.
*/
if (e.version == 0)
memset(e.mac[8], 0xff, 6);
#endif
for (i = 0; i < min(e.mac_count, (u8)MAX_NUM_PORTS); i++) {
if (memcmp(&e.mac[i], "\0\0\0\0\0\0", 6) &&
memcmp(&e.mac[i], "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
char ethaddr[18];
char enetvar[9];
sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
e.mac[i][0],
e.mac[i][1],
e.mac[i][2],
e.mac[i][3],
e.mac[i][4],
e.mac[i][5]);
sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
/* Only initialize environment variables that are blank
* (i.e. have not yet been set)
*/
if (!env_get(enetvar))
env_set(enetvar, ethaddr);
}
}
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
printf("%c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
be32_to_cpu(e.version));
#else
printf("%c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
#endif
#ifdef CONFIG_SYS_I2C_EEPROM_NXID
/*
* Now we need to upconvert the data into v1 format. We do this last so
* that at boot time, U-Boot will still say "NXID v0".
*/
if (e.version == 0) {
e.version = cpu_to_be32(NXID_VERSION);
update_crc();
}
#endif
return 0;
}
#ifdef CONFIG_SYS_I2C_EEPROM_CCID
/**
* get_cpu_board_revision - get the CPU board revision on 85xx boards
*
* Read the EEPROM to determine the board revision.
*
* This function is called before relocation, so we need to read a private
* copy of the EEPROM into a local variable on the stack.
*
* Also, we assume that CONFIG_SYS_EEPROM_BUS_NUM == CONFIG_SYS_SPD_BUS_NUM. The global
* variable i2c_bus_num must be compile-time initialized to CONFIG_SYS_SPD_BUS_NUM,
* so that the SPD code will work. This means that all pre-relocation I2C
* operations can only occur on the CONFIG_SYS_SPD_BUS_NUM bus. So if
* CONFIG_SYS_EEPROM_BUS_NUM != CONFIG_SYS_SPD_BUS_NUM, then we can't read the EEPROM when
* this function is called. Oh well.
*/
unsigned int get_cpu_board_revision(void)
{
struct board_eeprom {
u32 id; /* 0x00 - 0x03 EEPROM Tag 'CCID' */
u8 major; /* 0x04 Board revision, major */
u8 minor; /* 0x05 Board revision, minor */
} be;
i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
(void *)&be, sizeof(be));
if (be.id != (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
return MPC85XX_CPU_BOARD_REV(0, 0);
if ((be.major == 0xff) && (be.minor == 0xff))
return MPC85XX_CPU_BOARD_REV(0, 0);
return MPC85XX_CPU_BOARD_REV(be.major, be.minor);
}
#endif
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