at91: Update MEESC board support

This patch implements several updates:
-disable CONFIG_ENV_OVERWRITE
-add new hardware style variants and set the arch numbers appropriate
-pass the serial# and hardware revision to the kernel
-removed unused macros from include/configs/meesc.h
-fixed multiline comment style

Signed-off-by: Daniel Gorsulowski <Daniel.Gorsulowski@esd.eu>

board/esd/meesc/meesc.c

@@ -126,8 +126,10 @@ static void meesc_ethercat_hw_init(void)
 		AT91_SMC_NRDPULSE_(4) | AT91_SMC_NCS_RDPULSE_(9));
 	at91_sys_write(AT91_SMC1_CYCLE(0),
 		AT91_SMC_NWECYCLE_(10) | AT91_SMC_NRDCYCLE_(5));
-	/* Configure behavior at external wait signal, byte-select mode, 16 bit
-	data bus width, none data float wait states and TDF optimization */
+	/*
+	 * Configure behavior at external wait signal, byte-select mode, 16 bit
+	 * data bus width, none data float wait states and TDF optimization
+	 */
 	at91_sys_write(AT91_SMC1_MODE(0),
 		AT91_SMC_READMODE | AT91_SMC_EXNWMODE_READY |
 		AT91_SMC_BAT_SELECT | AT91_SMC_DBW_16 | AT91_SMC_TDF_(0) |
@@ -156,8 +158,32 @@ int board_eth_init(bd_t *bis)
 int checkboard(void)
 {
 	char str[32];
-
-	puts("Board: esd CAN-EtherCAT Gateway");
+	u_char hw_type;	/* hardware type */
+
+	/* read the "Type" register of the ET1100 controller */
+	hw_type = readb(CONFIG_ET1100_BASE);
+
+	switch (hw_type) {
+	case 0x11:
+	case 0x3F:
+		/* ET1100 present, arch number of MEESC-Board */
+		gd->bd->bi_arch_number = MACH_TYPE_MEESC;
+		puts("Board: CAN-EtherCAT Gateway");
+		break;
+	case 0xFF:
+		/* no ET1100 present, arch number of EtherCAN/2-Board */
+		gd->bd->bi_arch_number = MACH_TYPE_ETHERCAN2;
+		puts("Board: EtherCAN/2 Gateway");
+		/* switch on LED1D */
+		at91_set_gpio_output(AT91_PIN_PB12, 1);
+		break;
+	default:
+		/* assume, no ET1100 present, arch number of EtherCAN/2-Board */
+		gd->bd->bi_arch_number = MACH_TYPE_ETHERCAN2;
+		printf("ERROR! Read invalid hw_type: %02X\n", hw_type);
+		puts("Board: EtherCAN/2 Gateway");
+		break;
+	}
 	if (getenv_r("serial#", str, sizeof(str)) > 0) {
 		puts(", serial# ");
 		puts(str);
@@ -167,6 +193,32 @@ int checkboard(void)
 	return 0;
 }
 
+#ifdef CONFIG_SERIAL_TAG
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+	char *str;
+
+	char *serial = getenv("serial#");
+	if (serial) {
+		str = strchr(serial, '_');
+		if (str && (strlen(str) >= 4)) {
+			serialnr->high = (*(str + 1) << 8) | *(str + 2);
+			serialnr->low = simple_strtoul(str + 3, NULL, 16);
+		}
+	} else {
+		serialnr->high = 0;
+		serialnr->low = 0;
+	}
+}
+#endif
+
+#ifdef CONFIG_REVISION_TAG
+u32 get_board_rev(void)
+{
+	return hw_rev | 0x100;
+}
+#endif
+
 int board_init(void)
 {
 	/* Peripheral Clock Enable Register */
@@ -174,8 +226,8 @@ int board_init(void)
 					1 << AT91SAM9263_ID_PIOB |
 					1 << AT91SAM9263_ID_PIOCDE);
 
-	/* arch number of MEESC-Board */
-	gd->bd->bi_arch_number = MACH_TYPE_MEESC;
+	/* initialize ET1100 Controller */
+	meesc_ethercat_hw_init();
 
 	/* adress of boot parameters */
 	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
@@ -184,7 +236,6 @@ int board_init(void)
 #ifdef CONFIG_CMD_NAND
 	meesc_nand_hw_init();
 #endif
-	meesc_ethercat_hw_init();
 #ifdef CONFIG_HAS_DATAFLASH
 	at91_spi0_hw_init(1 << 0);
 #endif

include/configs/meesc.h

@@ -36,13 +36,14 @@
 #define CONFIG_MEESC			1	/* Board is esd MEESC */
 #define CONFIG_ARM926EJS		1	/* This is an ARM926EJS Core */
 #define CONFIG_AT91SAM9263		1	/* It's an AT91SAM9263 SoC */
-#define CONFIG_ENV_OVERWRITE		1	/* necessary on prototypes */
 #define CONFIG_DISPLAY_BOARDINFO	1
 #define CONFIG_DISPLAY_CPUINFO		1	/* display cpu info and speed */
 #define CONFIG_PREBOOT				/* enable preboot variable */
 #define CONFIG_CMDLINE_TAG		1	/* enable passing of ATAGs */
 #define CONFIG_SETUP_MEMORY_TAGS	1
 #define CONFIG_INITRD_TAG		1
+#define CONFIG_SERIAL_TAG		1
+#define CONFIG_REVISION_TAG		1
 #undef CONFIG_USE_IRQ				/* don't need IRQ/FIQ stuff */
 
 #define CONFIG_SKIP_LOWLEVEL_INIT
@@ -138,12 +139,13 @@
 #define CONFIG_SYS_USE_DATAFLASH		1
 #undef CONFIG_SYS_USE_NANDFLASH
 
-#ifdef CONFIG_SYS_USE_DATAFLASH
-
 /* CAN */
 #define CONFIG_AT91_CAN				1
 
-/* bootstrap + u-boot + env + linux in dataflash on CS0 */
+/* hw-controller addresses */
+#define CONFIG_ET1100_BASE			0x70000000
+
+/* bootstrap + u-boot + env in dataflash on CS0 */
 #define CONFIG_ENV_IS_IN_DATAFLASH	1
 #define CONFIG_SYS_MONITOR_BASE		(CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS0 + \
 					0x8400)
@@ -151,18 +153,6 @@
 #define CONFIG_ENV_ADDR			(CONFIG_SYS_DATAFLASH_LOGIC_ADDR_CS0 + \
 					CONFIG_ENV_OFFSET)
 #define CONFIG_ENV_SIZE			0x4200
-#define CONFIG_BOOTCOMMAND		"cp.b C0042000 22000000 210000; bootm"
-
-#else /* CONFIG_SYS_USE_NANDFLASH */
-
-/* bootstrap + u-boot + env + linux in nandflash */
-#define CONFIG_ENV_IS_IN_NAND	1
-#define CONFIG_ENV_OFFSET		0x60000
-#define CONFIG_ENV_OFFSET_REDUND	0x80000
-#define CONFIG_ENV_SIZE			0x20000		/* 1 sector = 128 kB */
-#define CONFIG_BOOTCOMMAND		"nand read 22000000 A0000 200000; bootm"
-
-#endif
 
 #define CONFIG_BAUDRATE			115200
 #define CONFIG_SYS_BAUDRATE_TABLE	{115200 , 19200, 38400, 57600, 9600 }
@@ -178,7 +168,8 @@
 /*
  * Size of malloc() pool
  */
-#define CONFIG_SYS_MALLOC_LEN		0x2D000
+#define CONFIG_SYS_MALLOC_LEN		ROUND(3 * CONFIG_ENV_SIZE + \
+					128*1024, 0x1000)
 #define CONFIG_SYS_GBL_DATA_SIZE	128	/* 128 bytes for initial data */
 
 #define CONFIG_STACKSIZE		(32 * 1024)	/* regular stack */