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u-boot/board/freescale/common/sys_eeprom.c
Biwen Li e343ae7c96 board/freescale/common: fix a bug that failed to read/write eeprom on ls1021atsn 
Fix a bug that failed to read/write eeprom on ls1021atsn

Signed-off-by: Biwen Li <biwen.li@nxp.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
2020-12-10 13:56:39 +05:30

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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 <env.h>
#include <i2c.h>
#include <init.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <u-boot/crc.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
#ifndef CONFIG_DM_I2C
unsigned int bus;
#endif
#endif
if (has_been_read)
return 0;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
#ifndef CONFIG_DM_I2C
bus = i2c_get_bus_num();
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif
#endif
#ifndef CONFIG_DM_I2C
ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
(void *)&e, sizeof(e));
#else
struct udevice *dev;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN, &dev);
#else
ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN, &dev);
#endif
if (!ret)
ret = dm_i2c_read(dev, 0, (void *)&e, sizeof(e));
#endif
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
#ifndef CONFIG_DM_I2C
i2c_set_bus_num(bus);
#endif
#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
#ifndef CONFIG_DM_I2C
unsigned int bus;
#endif
#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();
#ifndef CONFIG_DM_I2C
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
bus = i2c_get_bus_num();
i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
#endif
#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) {
#ifndef CONFIG_DM_I2C
ret = i2c_write(CONFIG_SYS_I2C_EEPROM_ADDR, i,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
p, min((int)(sizeof(e) - i), 8));
#else
struct udevice *dev;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
&dev);
#else
ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
&dev);
#endif
if (!ret)
ret = dm_i2c_write(dev, i, p, min((int)(sizeof(e) - i),
8));
#endif
if (ret)
break;
udelay(5000); /* 5ms write cycle timing */
}
if (!ret) {
/* Verify the write by reading back the EEPROM and comparing */
struct eeprom e2;
#ifndef CONFIG_DM_I2C
ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
(void *)&e2, sizeof(e2));
#else
struct udevice *dev;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
&dev);
#else
ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
&dev);
#endif
if (!ret)
ret = dm_i2c_read(dev, 0, (void *)&e2, sizeof(e2));
#endif
if (!ret && memcmp(&e, &e2, sizeof(e)))
ret = -1;
}
#ifndef CONFIG_DM_I2C
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
i2c_set_bus_num(bus);
#endif
#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(struct cmd_tbl *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;
#ifndef CONFIG_DM_I2C
i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
(void *)&be, sizeof(be));
#else
struct udevice *dev;
int ret;
#ifdef CONFIG_SYS_EEPROM_BUS_NUM
ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
&dev);
#else
ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR,
CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
&dev);
#endif
if (!ret)
dm_i2c_read(dev, 0, (void *)&be, sizeof(be));
#endif
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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