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-rw-r--r--post/cpu/ppc4xx/denali_ecc.c267
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..3fa3ba6
--- /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>
+
+#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;
+ }
+
+ /* clear error status */
+ mfsdram(DDR0_00, value);
+ mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
+
+ /*
+ * 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());
+#endif
+
+ return ret;
+
+}
+
+#endif /* CONFIG_POST & CFG_POST_ECC */
+#endif /* CONFIG_POST */
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