1 files changed, 267 insertions, 0 deletions
diff --git a/post/cpu/ppc4xx/denali_ecc.c b/post/cpu/ppc4xx/denali_ecc.c
new file mode 100644
index 0000000..7723483
--- /dev/null
+++ b/post/cpu/ppc4xx/denali_ecc.c
@@ -0,0 +1,267 @@
+/*
+ * (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>
+
+#if defined(CONFIG_POST) && (defined(CONFIG_440EPX) || defined(CONFIG_440GRX))
+
+#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>
+
+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		0x01010101
+#define ECC_PATTERN_CORR	0x11010101
+#define ECC_PATTERN_UNCORR	0xF1010101
+
+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)
+{
+	unsigned long value;
+	volatile unsigned *const ecc_mem = (volatile unsigned *) ecc_addr;
+	int pret;
+	int ret = 0;
+
+	sync();
+	eieio();
+	WATCHDOG_RESET();
+
+	debug("Entering test_ecc(0x%08lX)\n", ecc_addr);
+	out_be32(ecc_mem, ECC_PATTERN);
+	out_be32(ecc_mem + 1, ECC_PATTERN);
+	in_be32(ecc_mem);
+	pret = test_ecc_error();
+	if (pret != 0) {
+		debug("pret: expected 0, got %d\n", pret);
+		ret = 1;
+	}
+	/* test for correctable error */
+	/* disconnect from ecc storage */
+	mfsdram(DDR0_22, value);
+	mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
+		| DDR0_22_CTRL_RAW_ECC_DISABLE);
+
+	/* creating (correctable) single-bit error */
+	out_be32(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);
+	sync();
+	eieio();
+
+	in_be32(ecc_mem);
+	pret = test_ecc_error();
+	/* if read data ok, 1 correctable error must be fixed */
+	if (pret != 3) {
+		debug("pret: expected 3, got %d\n", pret);
+		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);
+
+	/* creating (uncorrectable) multiple-bit error */
+	out_be32(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);
+	sync();
+	eieio();
+
+	in_be32(ecc_mem);
+	pret = test_ecc_error();
+	/* info about uncorrectable error must appear */
+	if (pret != 5) {
+		debug("pret: expected 5, got %d\n", pret);
+		ret = 1;
+	}
+	/* remove error from SDRAM */
+	out_be32(ecc_mem, ECC_PATTERN);
+	/* clear error caused by read-modify-write */
+	mfsdram(DDR0_00, value);
+	mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
+
+	sync();
+	eieio();
+	return ret;
+}
+
+int ecc_post_test (int flags)
+{
+	int ret = 0;
+	unsigned long value;
+	unsigned long iaddr;
+
+	sync();
+	eieio();
+
+	mfsdram(DDR0_22, value);
+	if (0x3 != DDR0_22_CTRL_RAW_DECODE(value)) {
+		debug("SDRAM ECC not enabled, skipping ECC POST.\n");
+		return 0;
+	}
+
+	/* 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);
+
+	for (iaddr = ECC_START_ADDR; iaddr <= ECC_STOP_ADDR; iaddr += iaddr) {
+		ret = test_ecc(iaddr);
+		if (ret)
+			break;
+	}
+	/*
+	 * Clear possible errors resulting from ECC testing.
+	 * If not done, then we could get an interrupt later on when
+	 * exceptions are enabled.
+	 */
+	set_mcsr(get_mcsr());
+	return ret;
+
+}
+#endif /* CONFIG_POST & CFG_POST_ECC */
+#endif /* defined(CONFIG_POST) && ... */