compulab: eeprom: allow reading mac address from multiple eeproms

Implement the option to select the eeprom i2c bus when reading mac
address.

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Ilya Ledvich <ilya@compulab.co.il>
Cc: Dmitry Lifshitz <lifshitz@compulab.co.il>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>

board/compulab/cm_fx6/cm_fx6.c

@@ -354,7 +354,7 @@ static int handle_mac_address(void)
 	if (rc)
 		return 0;
 
-	rc = cl_eeprom_read_mac_addr(enetaddr);
+	rc = cl_eeprom_read_mac_addr(enetaddr, CONFIG_SYS_I2C_EEPROM_BUS);
 	if (rc)
 		return rc;
 

board/compulab/cm_t335/cm_t335.c

@@ -110,7 +110,7 @@ static int handle_mac_address(void)
 	if (rv)
 		return 0;
 
-	rv = cl_eeprom_read_mac_addr(enetaddr);
+	rv = cl_eeprom_read_mac_addr(enetaddr, CONFIG_SYS_I2C_EEPROM_BUS);
 	if (rv)
 		get_efuse_mac_addr(enetaddr);
 

board/compulab/cm_t35/cm_t35.c

@@ -429,7 +429,7 @@ static int handle_mac_address(void)
 	if (rc)
 		return 0;
 
-	rc = cl_eeprom_read_mac_addr(enetaddr);
+	rc = cl_eeprom_read_mac_addr(enetaddr, CONFIG_SYS_I2C_EEPROM_BUS);
 	if (rc)
 		return rc;
 

board/compulab/cm_t3517/cm_t3517.c

@@ -163,7 +163,7 @@ static int cm_t3517_handle_mac_address(void)
 	if (ret)
 		return 0;
 
-	ret = cl_eeprom_read_mac_addr(enetaddr);
+	ret = cl_eeprom_read_mac_addr(enetaddr, CONFIG_SYS_I2C_EEPROM_BUS);
 	if (ret) {
 		ret = am3517_get_efuse_enetaddr(enetaddr);
 		if (ret)

board/compulab/cm_t54/cm_t54.c

@@ -165,7 +165,7 @@ static int handle_mac_address(void)
 	if (ret)
 		return 0;
 
-	ret = cl_eeprom_read_mac_addr(enetaddr);
+	ret = cl_eeprom_read_mac_addr(enetaddr, CONFIG_SYS_I2C_EEPROM_BUS);
 	if (ret || !is_valid_ether_addr(enetaddr))
 		generate_mac_addr(enetaddr);
 

board/compulab/common/eeprom.c

@@ -31,6 +31,7 @@
 #define LAYOUT_INVALID	0
 #define LAYOUT_LEGACY	0xff
 
+static int cl_eeprom_bus;
 static int cl_eeprom_layout; /* Implicitly LAYOUT_INVALID */
 
 static int cl_eeprom_read(uint offset, uchar *buf, int len)
@@ -38,7 +39,7 @@ static int cl_eeprom_read(uint offset, uchar *buf, int len)
 	int res;
 	unsigned int current_i2c_bus = i2c_get_bus_num();
 
-	res = i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS);
+	res = i2c_set_bus_num(cl_eeprom_bus);
 	if (res < 0)
 		return res;
 
@@ -50,13 +51,18 @@ static int cl_eeprom_read(uint offset, uchar *buf, int len)
 	return res;
 }
 
-static int cl_eeprom_setup_layout(void)
+static int cl_eeprom_setup(uint eeprom_bus)
 {
 	int res;
 
-	if (cl_eeprom_layout != LAYOUT_INVALID)
+	/*
+	 * We know the setup was already done when the layout is set to a valid
+	 * value and we're using the same bus as before.
+	 */
+	if (cl_eeprom_layout != LAYOUT_INVALID && eeprom_bus == cl_eeprom_bus)
 		return 0;
 
+	cl_eeprom_bus = eeprom_bus;
 	res = cl_eeprom_read(EEPROM_LAYOUT_VER_OFFSET,
 			     (uchar *)&cl_eeprom_layout, 1);
 	if (res) {
@@ -77,7 +83,7 @@ void get_board_serial(struct tag_serialnr *serialnr)
 
 	memset(serialnr, 0, sizeof(*serialnr));
 
-	if (cl_eeprom_setup_layout())
+	if (cl_eeprom_setup(CONFIG_SYS_I2C_EEPROM_BUS))
 		return;
 
 	offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
@@ -96,11 +102,11 @@ void get_board_serial(struct tag_serialnr *serialnr)
  * Routine: cl_eeprom_read_mac_addr
  * Description: read mac address and store it in buf.
  */
-int cl_eeprom_read_mac_addr(uchar *buf)
+int cl_eeprom_read_mac_addr(uchar *buf, uint eeprom_bus)
 {
 	uint offset;
 
-	if (cl_eeprom_setup_layout())
+	if (cl_eeprom_setup(eeprom_bus))
 		return 0;
 
 	offset = (cl_eeprom_layout != LAYOUT_LEGACY) ?
@@ -123,7 +129,7 @@ u32 cl_eeprom_get_board_rev(void)
 	if (board_rev)
 		return board_rev;
 
-	if (cl_eeprom_setup_layout())
+	if (cl_eeprom_setup(CONFIG_SYS_I2C_EEPROM_BUS))
 		return 0;
 
 	if (cl_eeprom_layout != LAYOUT_LEGACY)

board/compulab/common/eeprom.h

@@ -11,10 +11,10 @@
 #define _EEPROM_
 
 #ifdef CONFIG_SYS_I2C
-int cl_eeprom_read_mac_addr(uchar *buf);
+int cl_eeprom_read_mac_addr(uchar *buf, uint eeprom_bus);
 u32 cl_eeprom_get_board_rev(void);
 #else
-static inline int cl_eeprom_read_mac_addr(uchar *buf)
+static inline int cl_eeprom_read_mac_addr(uchar *buf, uint eeprom_bus)
 {
 	return 1;
 }