Read Revision Number from EEPROM

Eric Lee
1 parent 03aa8dd14b
Showing 2 changed files with 80 additions and 2 deletions Side-by-side Diff
board/embedian/smarcfimx6/smarcfimx6.c
board/embedian/smarcfimx6/smarcfimx6.h
@@ -84,6 +84,48 @@
  
 #define OUTPUT_40OHM (PAD_CTL_SPEED_MED|PAD_CTL_DSE_40ohm)
  
+/*
+ * Read header information from EEPROM into global structure.
+ */
+static int read_eeprom(struct smarcfimx6_id *header)
+{
+        /* Check if baseboard eeprom is available */
+        if (i2c_probe(CONFIG_SYS_I2C_EEPROM_ADDR)) {
+                puts("Could not probe the EEPROM; something fundamentally "
+                        "wrong on the I2C bus.\n");
+                return -ENODEV;
+        }
+
+        /* read the eeprom using i2c */
+        if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 2, (uchar *)header,
+                     sizeof(struct smarcfimx6_id))) {
+                puts("Could not read the EEPROM; something fundamentally"
+                        " wrong on the I2C bus.\n");
+                return -EIO;
+        }
+
+        if (header->magic != 0xEE3355AA) {
+                /*
+                 * read the eeprom using i2c again,
+                 * but use only a 1 byte address
+                 */
+                if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 1, (uchar *)header,
+                             sizeof(struct smarcfimx6_id))) {
+                        puts("Could not read the EEPROM; something "
+                                "fundamentally wrong on the I2C bus.\n");
+                        return -EIO;
+                }
+
+                if (header->magic != 0xEE3355AA) {
+                        printf("Incorrect magic number (0x%x) in EEPROM\n",
+                                        header->magic);
+                        return -EINVAL;
+                }
+        }
+
+        return 0;
+}
+
 /*I2C1 I2C_PM*/
 struct i2c_pads_info i2c_pad_info1 = {
         .scl = {
@@ -1238,8 +1280,29 @@
  
 int checkboard(void)
 {
-	puts("Board: SMARC-FiMX6 Rev.00A0\n");
-	return 0;
+        struct smarcfimx6_id header;
+
+        if (read_eeprom(&header) < 0)
+        puts("Could not get board ID.\n");
+
+        if (revision_is_00a0(&header)) {
+        puts("Board: SMARC-FiMX6 Rev.00A0\n");
+
+        return 0;
+        } else if (revision_is_00b0(&header)) {
+        puts("Board: SMARC-FiMX6 Rev.00B0\n");
+
+        return 0;
+        } else if (revision_is_00c0(&header)) {
+        puts("Board: SMARC-FiMX6 Rev.00C0\n");
+
+        return 0;
+        } else {
+        puts("Board: SMARC-FiMX6, Cannot find Revision number from EEPROM\n");
+
+        return 0;
+        }
+
 }
  
 #ifdef CONFIG_FASTBOOT
@@ -84,6 +84,21 @@
         return !strncmp(header->name, "SMCMXQ2G", HDR_NAME_LEN);
 }
  
+static inline int revision_is_00a0(struct smarcfimx6_id *header)
+{
+        return !strncmp(header->version, "00A0", 4);
+}
+
+static inline int revision_is_00b0(struct smarcfimx6_id *header)
+{
+        return !strncmp(header->version, "00B0", 4);
+}
+
+static inline int revision_is_00c0(struct smarcfimx6_id *header)
+{
+        return !strncmp(header->version, "00C0", 4);
+}
+
 /*
  * Read ethernet MAC address from EEPROM for SMARC-FiMX6DVEVM compatible boards.
  * Returns 1 if found, 0 otherwise.
...	...	@@ -84,6 +84,48 @@
84	84
85	85	#define OUTPUT_40OHM (PAD_CTL_SPEED_MED\|PAD_CTL_DSE_40ohm)
86	86
	87	+/*
	88	+ * Read header information from EEPROM into global structure.
	89	+ */
	90	+static int read_eeprom(struct smarcfimx6_id *header)
	91	+{
	92	+ /* Check if baseboard eeprom is available */
	93	+ if (i2c_probe(CONFIG_SYS_I2C_EEPROM_ADDR)) {
	94	+ puts("Could not probe the EEPROM; something fundamentally "
	95	+ "wrong on the I2C bus.\n");
	96	+ return -ENODEV;
	97	+ }
	98	+
	99	+ /* read the eeprom using i2c */
	100	+ if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 2, (uchar *)header,
	101	+ sizeof(struct smarcfimx6_id))) {
	102	+ puts("Could not read the EEPROM; something fundamentally"
	103	+ " wrong on the I2C bus.\n");
	104	+ return -EIO;
	105	+ }
	106	+
	107	+ if (header->magic != 0xEE3355AA) {
	108	+ /*
	109	+ * read the eeprom using i2c again,
	110	+ * but use only a 1 byte address
	111	+ */
	112	+ if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 1, (uchar *)header,
	113	+ sizeof(struct smarcfimx6_id))) {
	114	+ puts("Could not read the EEPROM; something "
	115	+ "fundamentally wrong on the I2C bus.\n");
	116	+ return -EIO;
	117	+ }
	118	+
	119	+ if (header->magic != 0xEE3355AA) {
	120	+ printf("Incorrect magic number (0x%x) in EEPROM\n",
	121	+ header->magic);
	122	+ return -EINVAL;
	123	+ }
	124	+ }
	125	+
	126	+ return 0;
	127	+}
	128	+
87	129	/I2C1 I2C_PM/
88	130	struct i2c_pads_info i2c_pad_info1 = {
89	131	.scl = {
...	...	@@ -1238,8 +1280,29 @@
1238	1280
1239	1281	int checkboard(void)
1240	1282	{
1241		- puts("Board: SMARC-FiMX6 Rev.00A0\n");
1242		- return 0;
	1283	+ struct smarcfimx6_id header;
	1284	+
	1285	+ if (read_eeprom(&header) < 0)
	1286	+ puts("Could not get board ID.\n");
	1287	+
	1288	+ if (revision_is_00a0(&header)) {
	1289	+ puts("Board: SMARC-FiMX6 Rev.00A0\n");
	1290	+
	1291	+ return 0;
	1292	+ } else if (revision_is_00b0(&header)) {
	1293	+ puts("Board: SMARC-FiMX6 Rev.00B0\n");
	1294	+
	1295	+ return 0;
	1296	+ } else if (revision_is_00c0(&header)) {
	1297	+ puts("Board: SMARC-FiMX6 Rev.00C0\n");
	1298	+
	1299	+ return 0;
	1300	+ } else {
	1301	+ puts("Board: SMARC-FiMX6, Cannot find Revision number from EEPROM\n");
	1302	+
	1303	+ return 0;
	1304	+ }
	1305	+
1243	1306	}
1244	1307
1245	1308	#ifdef CONFIG_FASTBOOT
...	...	@@ -84,6 +84,21 @@
84	84	return !strncmp(header->name, "SMCMXQ2G", HDR_NAME_LEN);
85	85	}
86	86
	87	+static inline int revision_is_00a0(struct smarcfimx6_id *header)
	88	+{
	89	+ return !strncmp(header->version, "00A0", 4);
	90	+}
	91	+
	92	+static inline int revision_is_00b0(struct smarcfimx6_id *header)
	93	+{
	94	+ return !strncmp(header->version, "00B0", 4);
	95	+}
	96	+
	97	+static inline int revision_is_00c0(struct smarcfimx6_id *header)
	98	+{
	99	+ return !strncmp(header->version, "00C0", 4);
	100	+}
	101	+
87	102	/*
88	103	* Read ethernet MAC address from EEPROM for SMARC-FiMX6DVEVM compatible boards.
89	104	* Returns 1 if found, 0 otherwise.