siemens: eeprom: simplify setup & read

Since we have boards using the driver model or not for i2c, use abstraction
function to probe the i2c, check the EEPROM and read from EEPROM.

Signed-off-by: Enrico Leto <enrico.leto@siemens.com>

board/siemens/capricorn/Makefile

@@ -4,6 +4,7 @@
 #
 
 obj-y += board.o
+obj-y += ../common/eeprom.o
 
 ifdef CONFIG_SPL_BUILD
 obj-y += spl.o

board/siemens/common/board.c

@@ -29,7 +29,6 @@
 #include <asm/io.h>
 #include <asm/emif.h>
 #include <asm/gpio.h>
-#include <i2c.h>
 #include <miiphy.h>
 #include <cpsw.h>
 #include <watchdog.h>
@@ -39,6 +38,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+
 #ifdef CONFIG_SPL_BUILD
 void set_uart_mux_conf(void)
 {
@@ -49,12 +49,13 @@ void set_mux_conf_regs(void)
 {
 	/* Initalize the board header */
 	enable_i2c0_pin_mux();
-	i2c_set_bus_num(0);
 
 	/* enable early the console */
 	gd->baudrate = CONFIG_BAUDRATE;
 	serial_init();
 	gd->have_console = 1;
+
+	siemens_ee_setup();
 	if (read_eeprom() < 0)
 		puts("Could not get board ID.\n");
 
@@ -79,8 +80,7 @@ int board_init(void)
 #if defined(CONFIG_HW_WATCHDOG)
 	hw_watchdog_init();
 #endif /* defined(CONFIG_HW_WATCHDOG) */
-	i2c_set_bus_num(0);
-	if (read_eeprom() < 0)
+	if (siemens_ee_setup() < 0)
 		puts("Could not get board ID.\n");
 #ifdef CONFIG_MACH_TYPE
 	gd->bd->bi_arch_number = CONFIG_MACH_TYPE;

board/siemens/common/eeprom.c

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *
+ * Read EEPROM data
+ * (C) Copyright 2024 Siemens AG
+ */
+
+#include <dm/uclass.h>
+#include <i2c.h>
+#include "eeprom.h"
+
+#if CONFIG_IS_ENABLED(DM_I2C)
+static struct udevice *i2c_dev;
+#endif
+
+/* Probe I2C and set-up EEPROM */
+int siemens_ee_setup(void)
+{
+#if CONFIG_IS_ENABLED(DM_I2C)
+	struct udevice *bus;
+	int ret;
+
+	ret = uclass_get_device_by_seq(UCLASS_I2C, SIEMENS_EE_I2C_BUS, &bus);
+	if (ret)
+		goto err;
+
+	ret = dm_i2c_probe(bus, SIEMENS_EE_I2C_ADDR, 0, &i2c_dev);
+	if (ret)
+		goto err;
+	if (i2c_set_chip_offset_len(i2c_dev, 2))
+		goto err;
+#else
+	i2c_set_bus_num(SIEMENS_EE_I2C_BUS);
+	if (i2c_probe(SIEMENS_EE_I2C_ADDR))
+		goto err;
+#endif
+	return 0;
+
+err:
+	printf("Could not probe the EEPROM; something fundamentally wrong on the I2C bus.\n");
+	return 1;
+}
+
+/* Read data from EEPROM */
+int siemens_ee_read_data(uint address, uchar *buffer, int len)
+{
+#if CONFIG_IS_ENABLED(DM_I2C)
+	return dm_i2c_read(i2c_dev, address, buffer, len);
+#else
+	return i2c_read(SIEMENS_EE_I2C_ADDR, address, 2, buffer, len);
+#endif
+}

board/siemens/common/eeprom.h

@@ -18,4 +18,7 @@
 #define SIEMENS_EE_ADDR_CHIP		0x120
 #define SIEMENS_EE_ADDR_FACTORYSET	0x400
 
+int siemens_ee_setup(void);
+int siemens_ee_read_data(uint address, uchar *buffer, int len);
+
 #endif /* _COMMON_EEPROM_H_ */

board/siemens/common/factoryset.c

@@ -148,40 +148,15 @@ int factoryset_read_eeprom(int i2c_addr)
 	int i, pages = 0, size = 0;
 	unsigned char eeprom_buf[0x3c00], hdr[4], buf[MAX_STRING_LENGTH];
 	unsigned char *cp, *cp1;
-#if CONFIG_IS_ENABLED(DM_I2C)
-	struct udevice *bus, *dev;
-	int ret;
-#endif
 
 #if defined(CONFIG_DFU_OVER_USB)
 	factory_dat.usb_vendor_id = CONFIG_USB_GADGET_VENDOR_NUM;
 	factory_dat.usb_product_id = CONFIG_USB_GADGET_PRODUCT_NUM;
 #endif
 
-#if CONFIG_IS_ENABLED(DM_I2C)
-	ret = uclass_get_device_by_seq(UCLASS_I2C, SIEMENS_EE_I2C_BUS, &bus);
-	if (ret)
+	if (siemens_ee_read_data(SIEMENS_EE_ADDR_FACTORYSET, hdr, sizeof(hdr)))
 		goto err;
 
-	ret = dm_i2c_probe(bus, i2c_addr, 0, &dev);
-	if (ret)
-		goto err;
-
-	ret = i2c_set_chip_offset_len(dev, 2);
-	if (ret)
-		goto err;
-
-	ret = dm_i2c_read(dev, SIEMENS_EE_ADDR_FACTORYSET, hdr, sizeof(hdr));
-	if (ret)
-		goto err;
-#else
-	if (i2c_probe(i2c_addr))
-		goto err;
-
-	if (i2c_read(i2c_addr, SIEMENS_EE_ADDR_FACTORYSET, 2, hdr, sizeof(hdr)))
-		goto err;
-#endif
-
 	if ((hdr[0] != 0x99) || (hdr[1] != 0x80)) {
 		printf("FactorySet is not right in eeprom.\n");
 		return 1;
@@ -201,33 +176,16 @@ int factoryset_read_eeprom(int i2c_addr)
 	 * data after every time we got a record from eeprom
 	 */
 	debug("Read eeprom page :\n");
-	for (i = 0; i < pages; i++) {
-#if CONFIG_IS_ENABLED(DM_I2C)
-		ret = dm_i2c_read(dev, (OFF_PG + i) * EEPR_PG_SZ,
-				  eeprom_buf + (i * EEPR_PG_SZ), EEPR_PG_SZ);
-		if (ret)
+	for (i = 0; i < pages; i++)
+		if (siemens_ee_read_data((OFF_PG + i) * EEPR_PG_SZ,
+					 eeprom_buf + (i * EEPR_PG_SZ), EEPR_PG_SZ))
 			goto err;
-#else
-		if (i2c_read(i2c_addr, (OFF_PG + i) * EEPR_PG_SZ, 2,
-			     eeprom_buf + (i * EEPR_PG_SZ), EEPR_PG_SZ))
-			goto err;
-#endif
-	}
 
-	if (size % EEPR_PG_SZ) {
-#if CONFIG_IS_ENABLED(DM_I2C)
-		ret = dm_i2c_read(dev, (OFF_PG + pages) * EEPR_PG_SZ,
-				  eeprom_buf + (pages * EEPR_PG_SZ),
-				  size % EEPR_PG_SZ);
-		if (ret)
+	if (size % EEPR_PG_SZ)
+		if (siemens_ee_read_data((OFF_PG + pages) * EEPR_PG_SZ,
+					 eeprom_buf + (pages * EEPR_PG_SZ),
+					 size % EEPR_PG_SZ))
 			goto err;
-#else
-		if (i2c_read(i2c_addr, (OFF_PG + pages) * EEPR_PG_SZ, 2,
-			     eeprom_buf + (pages * EEPR_PG_SZ),
-			     (size % EEPR_PG_SZ)))
-			goto err;
-#endif
-	}
 
 	/* we do below just for eeprom align */
 	for (i = 0; i < size; i++)
@@ -249,9 +207,8 @@ int factoryset_read_eeprom(int i2c_addr)
 
 #if CONFIG_IS_ENABLED(TARGET_GIEDI) || CONFIG_IS_ENABLED(TARGET_DENEB)
 	/* get mac address for WLAN */
-	ret = get_factory_record_val(cp, size, (uchar *)"WLAN1", (uchar *)"mac",
-				     buf, MAX_STRING_LENGTH);
-	if (ret > 0) {
+	if (get_factory_record_val(cp, size, (uchar *)"WLAN1", (uchar *)"mac",
+				   buf, MAX_STRING_LENGTH) > 0) {
 		cp1 = buf;
 		for (i = 0; i < 6; i++) {
 			factory_dat.mac_wlan[i] = hextoul((char *)cp1, NULL);

board/siemens/draco/Makefile

@@ -14,6 +14,7 @@ obj-y	:= mux.o
 endif
 
 obj-y	+= board.o
+obj-y += ../common/eeprom.o
 ifndef CONFIG_SPL_BUILD
 obj-y += ../common/factoryset.o
 endif

board/siemens/draco/board.c

@@ -138,8 +138,8 @@ static int draco_read_nand_geometry(void)
 	struct am335x_nand_geometry geo;
 
 	/* Read NAND geometry */
-	if (i2c_read(SIEMENS_EE_I2C_ADDR, SIEMENS_EE_ADDR_NAND_GEO, 2,
-		     (uchar *)&geo, sizeof(struct am335x_nand_geometry))) {
+	if (siemens_ee_read_data(SIEMENS_EE_ADDR_NAND_GEO, (uchar *)&geo,
+				 sizeof(struct am335x_nand_geometry))) {
 		printf("Could not read the NAND geomtery; something fundamentally wrong on the I2C bus.\n");
 		return -EIO;
 	}
@@ -155,27 +155,21 @@ static int draco_read_nand_geometry(void)
 	return 0;
 }
 
+#ifdef CONFIG_SPL_BUILD
 /*
  * Read header information from EEPROM into global structure.
  */
 static int read_eeprom(void)
 {
-	/* Check if baseboard eeprom is available */
-	if (i2c_probe(SIEMENS_EE_I2C_ADDR)) {
-		printf("Could not probe the EEPROM; something fundamentally wrong on the I2C bus.\n");
-		return 1;
-	}
-
-#ifdef CONFIG_SPL_BUILD
 	/* Read Siemens eeprom data (DDR3) */
-	if (i2c_read(SIEMENS_EE_I2C_ADDR, SIEMENS_EE_ADDR_DDR3, 2,
-		     (uchar *)&settings.ddr3, sizeof(struct ddr3_data))) {
+	if (siemens_ee_read_data(SIEMENS_EE_ADDR_DDR3, (uchar *)&settings.ddr3,
+				 sizeof(struct ddr3_data))) {
 		printf("Could not read the EEPROM; something fundamentally wrong on the I2C bus.\nUse default DDR3 timings\n");
 		set_default_ddr3_timings();
 	}
 	/* Read Siemens eeprom data (CHIP) */
-	if (i2c_read(SIEMENS_EE_I2C_ADDR, SIEMENS_EE_ADDR_CHIP, 2,
-		     (uchar *)&settings.chip, sizeof(settings.chip)))
+	if (siemens_ee_read_data(SIEMENS_EE_ADDR_CHIP, (uchar *)&settings.chip,
+				 sizeof(settings.chip)))
 		printf("Could not read chip settings\n");
 
 	if (ddr3_default.magic == settings.ddr3.magic &&
@@ -199,11 +193,8 @@ static int read_eeprom(void)
 	print_ddr3_timings();
 
 	return draco_read_nand_geometry();
-#endif
-	return 0;
 }
 
-#ifdef CONFIG_SPL_BUILD
 static void board_init_ddr(void)
 {
 struct emif_regs draco_ddr3_emif_reg_data = {

board/siemens/draco/mux.c

@@ -16,7 +16,7 @@
 #include <asm/arch/mux.h>
 #include <asm/io.h>
 #include <i2c.h>
-#include "board.h"
+#include "eeprom.h"
 
 static struct module_pin_mux uart0_pin_mux[] = {
 	{OFFSET(uart0_rxd), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* UART0_RXD */

board/siemens/pxm2/Makefile

@@ -14,6 +14,7 @@ obj-y	:= mux.o
 endif
 
 obj-y	+= board.o
+obj-y += ../common/eeprom.o
 ifndef CONFIG_SPL_BUILD
 obj-y += ../common/factoryset.o
 endif

board/siemens/pxm2/board.c

@@ -161,7 +161,6 @@ void spl_siemens_board_init(void)
 		printf("voltage update failed\n");
 	}
 }
-#endif /* if def CONFIG_SPL_BUILD */
 
 int read_eeprom(void)
 {
@@ -169,6 +168,7 @@ int read_eeprom(void)
 
 	return 0;
 }
+#endif /* if def CONFIG_SPL_BUILD */
 
 #if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
 	(defined(CONFIG_SPL_ETH) && defined(CONFIG_SPL_BUILD))

board/siemens/pxm2/mux.c

@@ -17,7 +17,7 @@
 #include <asm/arch/mux.h>
 #include <asm/io.h>
 #include <i2c.h>
-#include "board.h"
+#include "eeprom.h"
 
 static struct module_pin_mux uart0_pin_mux[] = {
 	{OFFSET(uart0_rxd), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* UART0_RXD */

board/siemens/rut/Makefile

@@ -14,6 +14,7 @@ obj-y	:= mux.o
 endif
 
 obj-y	+= board.o
+obj-y += ../common/eeprom.o
 ifndef CONFIG_SPL_BUILD
 obj-y += ../common/factoryset.o
 endif

board/siemens/rut/board.c

@@ -39,6 +39,7 @@
 #include "../common/eeprom.h"
 #include "../common/factoryset.h"
 
+#ifdef CONFIG_SPL_BUILD
 /*
  * Read header information from EEPROM into global structure.
  */
@@ -47,7 +48,6 @@ static int read_eeprom(void)
 	return 0;
 }
 
-#ifdef CONFIG_SPL_BUILD
 static void board_init_ddr(void)
 {
 struct emif_regs rut_ddr3_emif_reg_data = {