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>

1 files changed, 39 insertions, 1 deletions

diff --git a/board/amcc/kilauea/kilauea.c b/board/amcc/kilauea/kilauea.c
index 8ce2445..646f431 100644
--- a/board/amcc/kilauea/kilauea.c
+++ b/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);
 }