compulab: add support for layout aware eeprom commands

Add layout definitions and implement functions for field printing/updating,
layout detection, layout assignment, and layout parsing.

Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>

board/compulab/common/eeprom.c

@@ -9,6 +9,9 @@
 
 #include <common.h>
 #include <i2c.h>
+#include <eeprom_layout.h>
+#include <eeprom_field.h>
+#include <linux/kernel.h>
 #include "eeprom.h"
 
 #ifndef CONFIG_SYS_I2C_EEPROM_ADDR
@@ -181,3 +184,344 @@ int cl_eeprom_get_product_name(uchar *buf, uint eeprom_bus)
 
 	return err;
 }
+
+#ifdef CONFIG_CMD_EEPROM_LAYOUT
+/**
+ * eeprom_field_print_bin_ver() - print a "version field" which contains binary
+ *				  data
+ *
+ * Treat the field data as simple binary data, and print it formatted as a
+ * version number (2 digits after decimal point).
+ * The field size must be exactly 2 bytes.
+ *
+ * Sample output:
+ *      Field Name      123.45
+ *
+ * @field:	an initialized field to print
+ */
+void eeprom_field_print_bin_ver(const struct eeprom_field *field)
+{
+	if ((field->buf[0] == 0xff) && (field->buf[1] == 0xff)) {
+		field->buf[0] = 0;
+		field->buf[1] = 0;
+	}
+
+	printf(PRINT_FIELD_SEGMENT, field->name);
+	int major = (field->buf[1] << 8 | field->buf[0]) / 100;
+	int minor = (field->buf[1] << 8 | field->buf[0]) - major * 100;
+	printf("%d.%02d\n", major, minor);
+}
+
+/**
+ * eeprom_field_update_bin_ver() - update a "version field" which contains
+ *				   binary data
+ *
+ * This function takes a version string in the form of x.y (x and y are both
+ * decimal values, y is limited to two digits), translates it to the binary
+ * form, then writes it to the field. The field size must be exactly 2 bytes.
+ *
+ * This function strictly enforces the data syntax, and will not update the
+ * field if there's any deviation from it. It also protects from overflow.
+ *
+ * @field:	an initialized field
+ * @value:	a version string
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int eeprom_field_update_bin_ver(struct eeprom_field *field, char *value)
+{
+	char *endptr;
+	char *tok = strtok(value, ".");
+	if (tok == NULL)
+		return -1;
+
+	int num = simple_strtol(tok, &endptr, 0);
+	if (*endptr != '\0')
+		return -1;
+
+	tok = strtok(NULL, "");
+	if (tok == NULL)
+		return -1;
+
+	int remainder = simple_strtol(tok, &endptr, 0);
+	if (*endptr != '\0')
+		return -1;
+
+	num = num * 100 + remainder;
+	if (num >> 16)
+		return -1;
+
+	field->buf[0] = (unsigned char)num;
+	field->buf[1] = num >> 8;
+
+	return 0;
+}
+
+char *months[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+
+/**
+ * eeprom_field_print_date() - print a field which contains date data
+ *
+ * Treat the field data as simple binary data, and print it formatted as a date.
+ * Sample output:
+ *      Field Name      07/Feb/2014
+ *      Field Name      56/BAD/9999
+ *
+ * @field:	an initialized field to print
+ */
+void eeprom_field_print_date(const struct eeprom_field *field)
+{
+	printf(PRINT_FIELD_SEGMENT, field->name);
+	printf("%02d/", field->buf[0]);
+	if (field->buf[1] >= 1 && field->buf[1] <= 12)
+		printf("%s", months[field->buf[1] - 1]);
+	else
+		printf("BAD");
+
+	printf("/%d\n", field->buf[3] << 8 | field->buf[2]);
+}
+
+static int validate_date(unsigned char day, unsigned char month,
+			unsigned int year)
+{
+	int days_in_february;
+
+	switch (month) {
+	case 0:
+	case 2:
+	case 4:
+	case 6:
+	case 7:
+	case 9:
+	case 11:
+		if (day > 31)
+			return -1;
+		break;
+	case 3:
+	case 5:
+	case 8:
+	case 10:
+		if (day > 30)
+			return -1;
+		break;
+	case 1:
+		days_in_february = 28;
+		if (year % 4 == 0) {
+			if (year % 100 != 0)
+				days_in_february = 29;
+			else if (year % 400 == 0)
+				days_in_february = 29;
+		}
+
+		if (day > days_in_february)
+			return -1;
+
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * eeprom_field_update_date() - update a date field which contains binary data
+ *
+ * This function takes a date string in the form of x/Mon/y (x and y are both
+ * decimal values), translates it to the binary representation, then writes it
+ * to the field.
+ *
+ * This function strictly enforces the data syntax, and will not update the
+ * field if there's any deviation from it. It also protects from overflow in the
+ * year value, and checks the validity of the date.
+ *
+ * @field:	an initialized field
+ * @value:	a date string
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int eeprom_field_update_date(struct eeprom_field *field, char *value)
+{
+	char *endptr;
+	char *tok1 = strtok(value, "/");
+	char *tok2 = strtok(NULL, "/");
+	char *tok3 = strtok(NULL, "/");
+
+	if (tok1 == NULL || tok2 == NULL || tok3 == NULL) {
+		printf("%s: syntax error\n", field->name);
+		return -1;
+	}
+
+	unsigned char day = (unsigned char)simple_strtol(tok1, &endptr, 0);
+	if (*endptr != '\0' || day == 0) {
+		printf("%s: invalid day\n", field->name);
+		return -1;
+	}
+
+	unsigned char month;
+	for (month = 1; month <= 12; month++)
+		if (!strcmp(tok2, months[month - 1]))
+			break;
+
+	unsigned int year = simple_strtol(tok3, &endptr, 0);
+	if (*endptr != '\0') {
+		printf("%s: invalid year\n", field->name);
+		return -1;
+	}
+
+	if (validate_date(day, month - 1, year)) {
+		printf("%s: invalid date\n", field->name);
+		return -1;
+	}
+
+	if (year >> 16) {
+		printf("%s: year overflow\n", field->name);
+		return -1;
+	}
+
+	field->buf[0] = day;
+	field->buf[1] = month;
+	field->buf[2] = (unsigned char)year;
+	field->buf[3] = (unsigned char)(year >> 8);
+
+	return 0;
+}
+
+#define	LAYOUT_VERSION_LEGACY 1
+#define	LAYOUT_VERSION_VER1 2
+#define	LAYOUT_VERSION_VER2 3
+#define	LAYOUT_VERSION_VER3 4
+
+extern struct eeprom_field layout_unknown[1];
+
+#define DEFINE_PRINT_UPDATE(x) eeprom_field_print_##x, eeprom_field_update_##x
+
+#ifdef CONFIG_CM_T3X
+struct eeprom_field layout_legacy[5] = {
+	{ "MAC address",          6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "Board Revision",       2, NULL, DEFINE_PRINT_UPDATE(bin) },
+	{ "Serial Number",        8, NULL, DEFINE_PRINT_UPDATE(bin) },
+	{ "Board Configuration", 64, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ RESERVED_FIELDS,      176, NULL, eeprom_field_print_reserved,
+					   eeprom_field_update_ascii },
+};
+#else
+#define layout_legacy layout_unknown
+#endif
+
+#if defined(CONFIG_CM_T3X) || defined(CONFIG_CM_T3517)
+struct eeprom_field layout_v1[12] = {
+	{ "Major Revision",      2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
+	{ "Minor Revision",      2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
+	{ "1st MAC Address",     6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "2nd MAC Address",     6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "Production Date",     4, NULL, DEFINE_PRINT_UPDATE(date) },
+	{ "Serial Number",      12, NULL, DEFINE_PRINT_UPDATE(bin_rev) },
+	{ RESERVED_FIELDS,      96, NULL, DEFINE_PRINT_UPDATE(reserved) },
+	{ "Product Name",       16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #1", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #2", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #3", 16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ RESERVED_FIELDS,      64, NULL, eeprom_field_print_reserved,
+					  eeprom_field_update_ascii },
+};
+#else
+#define layout_v1 layout_unknown
+#endif
+
+struct eeprom_field layout_v2[15] = {
+	{ "Major Revision",            2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
+	{ "Minor Revision",            2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
+	{ "1st MAC Address",           6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "2nd MAC Address",           6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "Production Date",           4, NULL, DEFINE_PRINT_UPDATE(date) },
+	{ "Serial Number",            12, NULL, DEFINE_PRINT_UPDATE(bin_rev) },
+	{ "3rd MAC Address (WIFI)",    6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "4th MAC Address (Bluetooth)", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "Layout Version",            1, NULL, DEFINE_PRINT_UPDATE(bin) },
+	{ RESERVED_FIELDS,            83, NULL, DEFINE_PRINT_UPDATE(reserved) },
+	{ "Product Name",             16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #1",       16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #2",       16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #3",       16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ RESERVED_FIELDS,            64, NULL, eeprom_field_print_reserved,
+						eeprom_field_update_ascii },
+};
+
+struct eeprom_field layout_v3[16] = {
+	{ "Major Revision",            2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
+	{ "Minor Revision",            2, NULL, DEFINE_PRINT_UPDATE(bin_ver) },
+	{ "1st MAC Address",           6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "2nd MAC Address",           6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "Production Date",           4, NULL, DEFINE_PRINT_UPDATE(date) },
+	{ "Serial Number",            12, NULL, DEFINE_PRINT_UPDATE(bin_rev) },
+	{ "3rd MAC Address (WIFI)",    6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "4th MAC Address (Bluetooth)", 6, NULL, DEFINE_PRINT_UPDATE(mac) },
+	{ "Layout Version",            1, NULL, DEFINE_PRINT_UPDATE(bin) },
+	{ "CompuLab EEPROM ID",        3, NULL, DEFINE_PRINT_UPDATE(bin) },
+	{ RESERVED_FIELDS,            80, NULL, DEFINE_PRINT_UPDATE(reserved) },
+	{ "Product Name",             16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #1",       16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #2",       16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ "Product Options #3",       16, NULL, DEFINE_PRINT_UPDATE(ascii) },
+	{ RESERVED_FIELDS,            64, NULL, eeprom_field_print_reserved,
+						eeprom_field_update_ascii },
+};
+
+void eeprom_layout_assign(struct eeprom_layout *layout, int layout_version)
+{
+	switch (layout->layout_version) {
+	case LAYOUT_VERSION_LEGACY:
+		layout->fields = layout_legacy;
+		layout->num_of_fields = ARRAY_SIZE(layout_legacy);
+		break;
+	case LAYOUT_VERSION_VER1:
+		layout->fields = layout_v1;
+		layout->num_of_fields = ARRAY_SIZE(layout_v1);
+		break;
+	case LAYOUT_VERSION_VER2:
+		layout->fields = layout_v2;
+		layout->num_of_fields = ARRAY_SIZE(layout_v2);
+		break;
+	case LAYOUT_VERSION_VER3:
+		layout->fields = layout_v3;
+		layout->num_of_fields = ARRAY_SIZE(layout_v3);
+		break;
+	default:
+		__eeprom_layout_assign(layout, layout_version);
+	}
+}
+
+int eeprom_parse_layout_version(char *str)
+{
+	if (!strcmp(str, "legacy"))
+		return LAYOUT_VERSION_LEGACY;
+	else if (!strcmp(str, "v1"))
+		return LAYOUT_VERSION_VER1;
+	else if (!strcmp(str, "v2"))
+		return LAYOUT_VERSION_VER2;
+	else if (!strcmp(str, "v3"))
+		return LAYOUT_VERSION_VER3;
+	else
+		return LAYOUT_VERSION_UNRECOGNIZED;
+}
+
+int eeprom_layout_detect(unsigned char *data)
+{
+	switch (data[EEPROM_LAYOUT_VER_OFFSET]) {
+	case 0xff:
+	case 0:
+		return LAYOUT_VERSION_VER1;
+	case 2:
+		return LAYOUT_VERSION_VER2;
+	case 3:
+		return LAYOUT_VERSION_VER3;
+	}
+
+	if (data[EEPROM_LAYOUT_VER_OFFSET] >= 0x20)
+		return LAYOUT_VERSION_LEGACY;
+
+	return LAYOUT_VERSION_UNRECOGNIZED;
+}
+#endif