POST: Add ECC POST for the lwmon5 board

This patch adds ECC Post test for the Lwmon5 board based
on PPC440EPx to U-Boot.

Signed-off-by: Pavel Kolesnikov <concord@emcraft.com>
Acked-by: Yuri Tikhonov <yur@emcraft.com>
Acked-by: Stefan Roese <sr@denx.de>

2 files changed, 286 insertions, 0 deletions

diff --git a/post/board/lwmon5/Makefile b/post/board/lwmon5/Makefile
new file mode 100644
index 0000000..c3f54e3
--- /dev/null
+++ b/post/board/lwmon5/Makefile
@@ -0,0 +1,29 @@
+#
+# (C) Copyright 2002-2007
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+
+LIB	= libpostlwmon5.a
+
+COBJS	= ecc.o
+
+include $(TOPDIR)/post/rules.mk
diff --git a/post/board/lwmon5/ecc.c b/post/board/lwmon5/ecc.c
new file mode 100644
index 0000000..7f04f9a
--- /dev/null
+++ b/post/board/lwmon5/ecc.c
@@ -0,0 +1,257 @@
+/*
+ * (C) Copyright 2007
+ * Developed for DENX Software Engineering GmbH.
+ *
+ * Author: Pavel Kolesnikov <concord@emcraft.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* define DEBUG for debugging output (obviously ;-)) */
+#if 0
+#define DEBUG
+#endif
+
+#include <common.h>
+#include <watchdog.h>
+
+#ifdef CONFIG_POST
+
+#include <post.h>
+
+#if CONFIG_POST & CFG_POST_ECC
+
+/*
+ * MEMORY ECC test
+ *
+ * This test performs the checks ECC facility of memory.
+ */
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/io.h>
+#include <ppc440.h>
+
+#include "../../../board/lwmon5/sdram.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+const static unsigned char syndrome_codes[] = {
+	0xF4, 0XF1, 0XEC ,0XEA, 0XE9, 0XE6, 0XE5, 0XE3,
+	0XDC, 0XDA, 0XD9, 0XD6, 0XD5, 0XD3, 0XCE, 0XCB,
+	0xB5, 0XB0, 0XAD, 0XAB, 0XA8, 0XA7, 0XA4, 0XA2,
+	0X9D, 0X9B, 0X98, 0X97, 0X94, 0X92, 0X8F, 0X8A,
+	0x75, 0x70, 0X6D, 0X6B, 0X68, 0X67, 0X64, 0X62,
+	0X5E, 0X5B, 0X58, 0X57, 0X54, 0X52, 0X4F, 0X4A,
+	0x34, 0x31, 0X2C, 0X2A, 0X29, 0X26, 0X25, 0X23,
+	0X1C, 0X1A, 0X19, 0X16, 0X15, 0X13, 0X0E, 0X0B,
+	0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
+};
+
+#define ECC_START_ADDR		0x10
+#define ECC_STOP_ADDR		0x2000
+#define ECC_PATTERN		0x0101010101010101ull
+#define ECC_PATTERN_CORR	0x0101010101010100ull
+#define ECC_PATTERN_UNCORR	0x010101010101010Full
+
+static int test_ecc_error(void)
+{
+	unsigned long value;
+	unsigned long hdata, ldata, haddr, laddr;
+	unsigned int bit;
+
+	int ret = 0;
+
+	mfsdram(DDR0_23, value);
+
+	for (bit = 0; bit < sizeof(syndrome_codes); bit++)
+		if (syndrome_codes[bit] == ((value >> 16) & 0xff))
+			break;
+
+	mfsdram(DDR0_00, value);
+
+	if (value & DDR0_00_INT_STATUS_BIT0) {
+		debug("Bit0. A single access outside the defined PHYSICAL"
+		      " memory space detected\n");
+		mfsdram(DDR0_32, laddr);
+		mfsdram(DDR0_33, haddr);
+		debug("        addr = 0x%08x%08x\n", haddr, laddr);
+		ret = 1;
+	}
+	if (value & DDR0_00_INT_STATUS_BIT1) {
+		debug("Bit1. Multiple accesses outside the defined PHYSICAL"
+		      " memory space detected\n");
+		ret = 2;
+	}
+	if (value & DDR0_00_INT_STATUS_BIT2) {
+		debug("Bit2. Single correctable ECC event detected\n");
+		mfsdram(DDR0_38, laddr);
+		mfsdram(DDR0_39, haddr);
+		mfsdram(DDR0_40, ldata);
+		mfsdram(DDR0_41, hdata);
+		debug("        0x%08x - 0x%08x%08x, bit - %d\n",
+		      laddr, hdata, ldata, bit);
+		ret = 3;
+	}
+	if (value & DDR0_00_INT_STATUS_BIT3) {
+		debug("Bit3. Multiple correctable ECC events detected\n");
+		mfsdram(DDR0_38, laddr);
+		mfsdram(DDR0_39, haddr);
+		mfsdram(DDR0_40, ldata);
+		mfsdram(DDR0_41, hdata);
+		debug("        0x%08x - 0x%08x%08x, bit - %d\n",
+		      laddr, hdata, ldata, bit);
+		ret = 4;
+	}
+	if (value & DDR0_00_INT_STATUS_BIT4) {
+		debug("Bit4. Single uncorrectable ECC event detected\n");
+		mfsdram(DDR0_34, laddr);
+		mfsdram(DDR0_35, haddr);
+		mfsdram(DDR0_36, ldata);
+		mfsdram(DDR0_37, hdata);
+		debug("        0x%08x - 0x%08x%08x, bit - %d\n",
+		      laddr, hdata, ldata, bit);
+		ret = 5;
+	}
+	if (value & DDR0_00_INT_STATUS_BIT5) {
+		debug("Bit5. Multiple uncorrectable ECC events detected\n");
+		mfsdram(DDR0_34, laddr);
+		mfsdram(DDR0_35, haddr);
+		mfsdram(DDR0_36, ldata);
+		mfsdram(DDR0_37, hdata);
+		debug("        0x%08x - 0x%08x%08x, bit - %d\n",
+		      laddr, hdata, ldata, bit);
+		ret = 6;
+	}
+	if (value & DDR0_00_INT_STATUS_BIT6) {
+		debug("Bit6. DRAM initialization complete\n");
+		ret = 7;
+	}
+
+	/* error status cleared */
+	mfsdram(DDR0_00, value);
+	mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
+
+	return ret;
+}
+
+static int test_ecc(unsigned long ecc_addr)
+{
+	volatile unsigned long long *ecc_mem;
+	unsigned long value;
+	unsigned long ecc_data;
+	volatile unsigned long *lecc_mem;
+	int pret, ret = 0;
+
+	sync();
+	eieio();
+	WATCHDOG_RESET();
+
+	ecc_mem = (unsigned long long *)ecc_addr;
+	lecc_mem = (ulong *)ecc_addr;
+	*ecc_mem = ECC_PATTERN;
+	pret = test_ecc_error();
+	if (pret != 0)
+		ret = 1;
+
+	/* disconnect ecc */
+	mfsdram(DDR0_22, value);
+	mtsdram(DDR0_22, (value &~ DDR0_22_CTRL_RAW_MASK)
+		| DDR0_22_CTRL_RAW_ECC_DISABLE);
+
+	/* injecting error */
+	*ecc_mem = ECC_PATTERN_CORR;
+
+	/* enable ecc */
+	mfsdram(DDR0_22, value);
+	mtsdram(DDR0_22, (value &~ DDR0_22_CTRL_RAW_MASK)
+		| DDR0_22_CTRL_RAW_ECC_ENABLE);
+
+	ecc_data = *lecc_mem;
+	pret = test_ecc_error();
+	/* if read data ok, 1 correctable error must be fixed */
+	if (pret != 3)
+		ret = 1;
+
+	/* test for uncorrectable error */
+	/* disconnect from ecc storage */
+	mfsdram(DDR0_22, value);
+	mtsdram(DDR0_22, (value &~ DDR0_22_CTRL_RAW_MASK)
+		| DDR0_22_CTRL_RAW_NO_ECC_RAM);
+
+	/* injecting multiply bit error */
+
+	*ecc_mem = ECC_PATTERN_UNCORR;
+
+	/* enable ecc */
+	mfsdram(DDR0_22, value);
+	mtsdram(DDR0_22, (value &~ DDR0_22_CTRL_RAW_MASK)
+		| DDR0_22_CTRL_RAW_ECC_ENABLE);
+
+	ecc_data = *lecc_mem;
+	/* what the data should be read? */
+
+	pret = test_ecc_error();
+	/* info about uncorrectable error must appear */
+	if (pret != 5)
+		ret = 1;
+
+	sync();
+	eieio();
+
+	return ret;
+}
+
+int ecc_post_test (int flags)
+{
+	int ret = 0;
+	unsigned long value;
+	unsigned long iaddr;
+
+#if CONFIG_DDR_ECC
+	sync();
+	eieio();
+
+	/* mask all int */
+	mfsdram(DDR0_01, value);
+	mtsdram(DDR0_01, (value &~ DDR0_01_INT_MASK_MASK)
+		| DDR0_01_INT_MASK_ALL_OFF);
+
+	/* clear error status */
+	mfsdram(DDR0_00, value);
+	mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
+
+
+	/* enable full support of ECC */
+	mfsdram(DDR0_22, value);
+	mtsdram(DDR0_22, (value &~ DDR0_22_CTRL_RAW_MASK)
+		| DDR0_22_CTRL_RAW_ECC_ENABLE);
+
+	for (iaddr = ECC_START_ADDR; iaddr < ECC_STOP_ADDR; iaddr += iaddr) {
+		ret = test_ecc(iaddr);
+		if (ret)
+			break;
+	}
+#endif
+
+	return ret;
+
+}
+
+#endif /* CONFIG_POST & CFG_POST_ECC */
+#endif /* CONFIG_POST */