diff options
| -rw-r--r-- | post/cpu/ppc4xx/denali_ecc.c | 266 |
1 files changed, 135 insertions, 131 deletions
diff --git a/post/cpu/ppc4xx/denali_ecc.c b/post/cpu/ppc4xx/denali_ecc.c index 77234838d..439f80d1f 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); +} - if (value & DDR0_00_INT_STATUS_BIT0) { - debug("Bit0. A single access outside the defined PHYSICAL" - " memory space detected\n"); +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 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"); - /* error status cleared */ - mfsdram(DDR0_00, value); - mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL); + 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) */ - 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) && ... */ |