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-rw-r--r--post/cpu/ppc4xx/denali_ecc.c266
1 files changed, 135 insertions, 131 deletions
diff --git a/post/cpu/ppc4xx/denali_ecc.c b/post/cpu/ppc4xx/denali_ecc.c
index 7723483..439f80d 100644
--- a/post/cpu/ppc4xx/denali_ecc.c
+++ b/post/cpu/ppc4xx/denali_ecc.c
@@ -49,7 +49,7 @@
DECLARE_GLOBAL_DATA_PTR;
-const static unsigned char syndrome_codes[] = {
+const static uint8_t 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,
@@ -65,174 +65,183 @@ const static unsigned char syndrome_codes[] = {
#define ECC_STOP_ADDR 0x2000
#define ECC_PATTERN 0x01010101
#define ECC_PATTERN_CORR 0x11010101
-#define ECC_PATTERN_UNCORR 0xF1010101
+#define ECC_PATTERN_UNCORR 0x61010101
-static int test_ecc_error(void)
+inline static void disable_ecc(void)
{
- unsigned long value;
- unsigned long hdata, ldata, haddr, laddr;
- unsigned int bit;
+ uint32_t value;
- int ret = 0;
-
- mfsdram(DDR0_23, value);
+ sync(); /* Wait for any pending memory accesses to complete. */
+ mfsdram(DDR0_22, value);
+ mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
+ | DDR0_22_CTRL_RAW_ECC_DISABLE);
+}
- for (bit = 0; bit < sizeof(syndrome_codes); bit++)
- if (syndrome_codes[bit] == ((value >> 16) & 0xff))
- break;
+inline static void clear_and_enable_ecc(void)
+{
+ uint32_t value;
+ sync(); /* Wait for any pending memory accesses to complete. */
mfsdram(DDR0_00, value);
+ mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
+ mfsdram(DDR0_22, value);
+ mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
+ | DDR0_22_CTRL_RAW_ECC_ENABLE);
+}
+
+static uint32_t get_ecc_status(void)
+{
+ uint32_t int_status;
+#if defined(DEBUG)
+ uint8_t syndrome;
+ uint32_t hdata, ldata, haddr, laddr;
+ uint32_t value;
+#endif
+
+ mfsdram(DDR0_00, int_status);
+ int_status &= DDR0_00_INT_STATUS_MASK;
- if (value & DDR0_00_INT_STATUS_BIT0) {
- debug("Bit0. A single access outside the defined PHYSICAL"
- " memory space detected\n");
+#if defined(DEBUG)
+ if (int_status & (DDR0_00_INT_STATUS_BIT0 | DDR0_00_INT_STATUS_BIT1)) {
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;
+ haddr &= 0x00000001;
+ if (int_status & DDR0_00_INT_STATUS_BIT1)
+ debug("Multiple accesses");
+ else
+ debug("A single access");
+
+ debug(" outside the defined physical memory space detected\n"
+ " addr = 0x%01x%08x\n", haddr, laddr);
}
- if (value & DDR0_00_INT_STATUS_BIT3) {
- debug("Bit3. Multiple correctable ECC events detected\n");
+ if (int_status & (DDR0_00_INT_STATUS_BIT2 | DDR0_00_INT_STATUS_BIT3)) {
+ unsigned int bit;
+
+ mfsdram(DDR0_23, value);
+ syndrome = (value >> 16) & 0xff;
+ for (bit = 0; bit < sizeof(syndrome_codes); bit++)
+ if (syndrome_codes[bit] == syndrome)
+ break;
+
mfsdram(DDR0_38, laddr);
mfsdram(DDR0_39, haddr);
+ haddr &= 0x00000001;
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 (int_status & DDR0_00_INT_STATUS_BIT3)
+ debug("Multiple correctable ECC events");
+ else
+ debug("Single correctable ECC event");
+
+ debug(" detected\n 0x%01x%08x - 0x%08x%08x, bit - %d\n",
+ haddr, laddr, hdata, ldata, bit);
}
- if (value & DDR0_00_INT_STATUS_BIT5) {
- debug("Bit5. Multiple uncorrectable ECC events detected\n");
+ if (int_status & (DDR0_00_INT_STATUS_BIT4 | DDR0_00_INT_STATUS_BIT5)) {
+ mfsdram(DDR0_23, value);
+ syndrome = (value >> 8) & 0xff;
mfsdram(DDR0_34, laddr);
mfsdram(DDR0_35, haddr);
+ haddr &= 0x00000001;
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;
+ if (int_status & DDR0_00_INT_STATUS_BIT5)
+ debug("Multiple uncorrectable ECC events");
+ else
+ debug("Single uncorrectable ECC event");
+
+ debug(" detected\n 0x%01x%08x - 0x%08x%08x, "
+ "syndrome - 0x%02x\n",
+ haddr, laddr, hdata, ldata, syndrome);
}
+ if (int_status & DDR0_00_INT_STATUS_BIT6)
+ debug("DRAM initialization complete\n");
+#endif /* defined(DEBUG) */
- /* error status cleared */
- mfsdram(DDR0_00, value);
- mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
-
- return ret;
+ return int_status;
}
-static int test_ecc(unsigned long ecc_addr)
+static int test_ecc(uint32_t ecc_addr)
{
- unsigned long value;
- volatile unsigned *const ecc_mem = (volatile unsigned *) ecc_addr;
- int pret;
+ uint32_t value;
+ volatile uint32_t *const ecc_mem = (volatile uint32_t *)ecc_addr;
int ret = 0;
- sync();
- eieio();
WATCHDOG_RESET();
- debug("Entering test_ecc(0x%08lX)\n", ecc_addr);
+ debug("Entering test_ecc(0x%08x)\n", ecc_addr);
+ /* Set up correct ECC in memory */
+ disable_ecc();
+ clear_and_enable_ecc();
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);
+
+ /* Verify no ECC error reading back */
+ value = in_be32(ecc_mem);
+ disable_ecc();
+ if (ECC_PATTERN != value) {
+ debug("Data read error (no-error case): "
+ "expected 0x%08x, read 0x%08x\n", ECC_PATTERN, value);
+ ret = 1;
+ }
+ value = get_ecc_status();
+ if (0x00000000 != value) {
+ /* Expected no ECC status reported */
+ debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
+ 0x00000000, value);
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 */
+ /* Test for correctable error by creating a one-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);
+ clear_and_enable_ecc();
+ value = in_be32(ecc_mem);
+ disable_ecc();
+ /* Test that the corrected data was read */
+ if (ECC_PATTERN != value) {
+ debug("Data read error (correctable-error case): "
+ "expected 0x%08x, read 0x%08x\n", ECC_PATTERN, value);
+ ret = 1;
+ }
+ value = get_ecc_status();
+ if ((DDR0_00_INT_STATUS_BIT2 | DDR0_00_INT_STATUS_BIT7) != value) {
+ /* Expected a single correctable error reported */
+ debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
+ DDR0_00_INT_STATUS_BIT2, value);
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 */
+ /* Test for uncorrectable error by creating a two-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);
+ clear_and_enable_ecc();
+ value = in_be32(ecc_mem);
+ disable_ecc();
+ /* Test that the corrected data was read */
+ if (ECC_PATTERN_UNCORR != value) {
+ debug("Data read error (uncorrectable-error case): "
+ "expected 0x%08x, read 0x%08x\n", ECC_PATTERN_UNCORR,
+ value);
+ ret = 1;
+ }
+ value = get_ecc_status();
+ if ((DDR0_00_INT_STATUS_BIT4 | DDR0_00_INT_STATUS_BIT7) != value) {
+ /* Expected a single uncorrectable error reported */
+ debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
+ DDR0_00_INT_STATUS_BIT4, value);
ret = 1;
}
- /* remove error from SDRAM */
+
+ /* Remove error from SDRAM and enable ECC. */
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);
+ clear_and_enable_ecc();
- sync();
- eieio();
return ret;
}
-int ecc_post_test (int flags)
+int ecc_post_test(int flags)
{
int ret = 0;
- unsigned long value;
- unsigned long iaddr;
-
- sync();
- eieio();
+ uint32_t value;
+ uint32_t iaddr;
mfsdram(DDR0_22, value);
if (0x3 != DDR0_22_CTRL_RAW_DECODE(value)) {
@@ -240,28 +249,23 @@ int ecc_post_test (int flags)
return 0;
}
- /* mask all int */
+ /* Mask all interrupts. */
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.
+ * Clear possible errors resulting from ECC testing. (If not done, we
+ * we could get an interrupt later on when exceptions are enabled.)
*/
set_mcsr(get_mcsr());
+ debug("ecc_post_test() returning %d\n", ret);
return ret;
-
}
#endif /* CONFIG_POST & CFG_POST_ECC */
#endif /* defined(CONFIG_POST) && ... */
generated by cgit v1.1 at 2024-11-26 17:15:19 +0000