ppc4xx: Kilauea: Add CPLD version detection and EBC reconfiguration

A newer CPLD version on the 405EX evaluation board requires a different
EBC controller setup for the CPLD register access. This patch adds a CPLD
version detection for Kilauea and code to reconfigure the EBC controller
(chip select 2) for the old CPLD if no new version is found.

Additionally the CPLD version is printed upon bootup:

Board: Kilauea - AMCC PPC405EX Evaluation Board (CPLD rev. 0)

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Cc: Zhang Bao Quan <bqzhang@udtech.com.cn>

board/amcc/kilauea/kilauea.c

@@ -39,6 +39,37 @@ DECLARE_GLOBAL_DATA_PTR;
 
 extern flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
 
+static int board_cpld_version(void)
+{
+	u32 cpld;
+
+	cpld = in_be32((void *)CONFIG_SYS_FPGA_FIFO_BASE);
+	if ((cpld & CONFIG_SYS_FPGA_MAGIC_MASK) != CONFIG_SYS_FPGA_MAGIC) {
+		/*
+		 * Magic not found -> "old" CPLD revision which needs
+		 * the "old" EBC configuration
+		 */
+		mtebc(PB2AP, EBC_BXAP_BME_ENABLED | EBC_BXAP_FWT_ENCODE(5) |
+		      EBC_BXAP_BWT_ENCODE(0) | EBC_BXAP_BCE_DISABLE |
+		      EBC_BXAP_BCT_2TRANS | EBC_BXAP_CSN_ENCODE(0) |
+		      EBC_BXAP_OEN_ENCODE(0) | EBC_BXAP_WBN_ENCODE(3) |
+		      EBC_BXAP_WBF_ENCODE(0) | EBC_BXAP_TH_ENCODE(4) |
+		      EBC_BXAP_RE_DISABLED | EBC_BXAP_SOR_DELAYED |
+		      EBC_BXAP_BEM_WRITEONLY | EBC_BXAP_PEN_DISABLED);
+
+		/*
+		 * Return 0 for "old" CPLD version
+		 */
+		return 0;
+	}
+
+	/*
+	 * Magic found -> "new" CPLD revision which needs no new
+	 * EBC configuration
+	 */
+	return (cpld & CONFIG_SYS_FPGA_VER_MASK) >> 8;
+}
+
 /*
  * Board early initialization function
  */
@@ -209,6 +240,13 @@ int board_early_init_f (void)
 	mtsdr(SDR0_PFC1, val);
 
 	/*
+	 * The CPLD version detection has to be the first access to
+	 * the CPLD, so we need to make this access this early and
+	 * save the CPLD version for later.
+	 */
+	gd->board_type = board_cpld_version();
+
+	/*
 	 * Configure FPGA register with PCIe reset
 	 */
 	out_be32((void *)CONFIG_SYS_FPGA_BASE, 0xff570cc4);	/* assert PCIe reset */
@@ -280,7 +318,7 @@ int checkboard (void)
 		puts(", serial# ");
 		puts(s);
 	}
-	putc('\n');
+	printf(" (CPLD rev. %ld)\n", gd->board_type);
 
 	return (0);
 }

include/configs/kilauea.h

@@ -47,6 +47,7 @@
 
 #define CONFIG_BOARD_EARLY_INIT_F 1		/* Call board_early_init_f */
 #define CONFIG_MISC_INIT_R	1		/* Call misc_init_r	*/
+#define CONFIG_BOARD_TYPES
 #define CONFIG_BOARD_EMAC_COUNT
 
 /*-----------------------------------------------------------------------
@@ -520,9 +521,22 @@
 #define CONFIG_SYS_EBC_PB1CR		(CONFIG_SYS_NAND_ADDR | 0x1e000)
 #endif
 
-/* Memory Bank 2 (FPGA) initialization						*/
-#define CONFIG_SYS_EBC_PB2AP           0x9400C800
-#define CONFIG_SYS_EBC_PB2CR		(CONFIG_SYS_FPGA_BASE | 0x18000)
+/* Memory Bank 2 (FPGA) initialization					*/
+#define CONFIG_SYS_EBC_PB2AP		(EBC_BXAP_BME_ENABLED |		\
+					 EBC_BXAP_FWT_ENCODE(6) |	\
+					 EBC_BXAP_BWT_ENCODE(1) |	\
+					 EBC_BXAP_BCE_DISABLE |		\
+					 EBC_BXAP_BCT_2TRANS |		\
+					 EBC_BXAP_CSN_ENCODE(0) |	\
+					 EBC_BXAP_OEN_ENCODE(0) |	\
+					 EBC_BXAP_WBN_ENCODE(3) |	\
+					 EBC_BXAP_WBF_ENCODE(1) |	\
+					 EBC_BXAP_TH_ENCODE(4) |	\
+					 EBC_BXAP_RE_DISABLED |		\
+					 EBC_BXAP_SOR_DELAYED |		\
+					 EBC_BXAP_BEM_WRITEONLY |	\
+					 EBC_BXAP_PEN_DISABLED)
+#define CONFIG_SYS_EBC_PB2CR	(CONFIG_SYS_FPGA_BASE | 0x18000)
 
 #define CONFIG_SYS_EBC_CFG		0x7FC00000 /*  EBC0_CFG */
 
@@ -571,7 +585,7 @@
  * Some Kilauea stuff..., mainly fpga registers
  */
 #define CONFIG_SYS_FPGA_REG_BASE		CONFIG_SYS_FPGA_BASE
-#define CONFIG_SYS_FPGA_FIFO_BASE		(in32(CONFIG_SYS_FPGA_BASE) | (1 << 10))
+#define CONFIG_SYS_FPGA_FIFO_BASE		(CONFIG_SYS_FPGA_BASE | (1 << 10))
 
 /* interrupt */
 #define CONFIG_SYS_FPGA_SLIC0_R_DPRAM_INT	0x80000000
@@ -602,4 +616,8 @@
 #define CONFIG_SYS_FPGA_USER_LED0		0x00000200
 #define CONFIG_SYS_FPGA_USER_LED1		0x00000100
 
+#define CONFIG_SYS_FPGA_MAGIC_MASK		0xffff0000
+#define CONFIG_SYS_FPGA_MAGIC			0xabcd0000
+#define CONFIG_SYS_FPGA_VER_MASK		0x0000ff00
+
 #endif	/* __CONFIG_H */