post/cpu/ppc4xx/denali_ecc.c

   1 /*
   2  * (C) Copyright 2007
   3  * Developed for DENX Software Engineering GmbH.
   4  *
   5  * Author: Pavel Kolesnikov <concord@emcraft.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 /* define DEBUG for debugging output (obviously ;-)) */
  11 #if 0
  12 #define DEBUG
  13 #endif
  14
  15 #include <common.h>
  16 #include <watchdog.h>
  17
  18 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
  19
  20 #include <post.h>
  21
  22 #if CONFIG_POST & CONFIG_SYS_POST_ECC
  23
  24 /*
  25  * MEMORY ECC test
  26  *
  27  * This test performs the checks ECC facility of memory.
  28  */
  29 #include <asm/processor.h>
  30 #include <asm/mmu.h>
  31 #include <asm/io.h>
  32 #include <asm/ppc440.h>
  33
  34 DECLARE_GLOBAL_DATA_PTR;
  35
  36 #if defined(DEBUG)
  37 const static uint8_t syndrome_codes[] = {
  38         0xF4, 0XF1, 0XEC, 0XEA, 0XE9, 0XE6, 0XE5, 0XE3,
  39         0XDC, 0XDA, 0XD9, 0XD6, 0XD5, 0XD3, 0XCE, 0XCB,
  40         0xB5, 0XB0, 0XAD, 0XAB, 0XA8, 0XA7, 0XA4, 0XA2,
  41         0X9D, 0X9B, 0X98, 0X97, 0X94, 0X92, 0X8F, 0X8A,
  42         0x75, 0x70, 0X6D, 0X6B, 0X68, 0X67, 0X64, 0X62,
  43         0X5E, 0X5B, 0X58, 0X57, 0X54, 0X52, 0X4F, 0X4A,
  44         0x34, 0x31, 0X2C, 0X2A, 0X29, 0X26, 0X25, 0X23,
  45         0X1C, 0X1A, 0X19, 0X16, 0X15, 0X13, 0X0E, 0X0B,
  46         0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
  47 };
  48 #endif
  49
  50 #define ECC_START_ADDR          0x10
  51 #define ECC_STOP_ADDR           0x2000
  52 #define ECC_PATTERN             0x01010101
  53 #define ECC_PATTERN_CORR        0x11010101
  54 #define ECC_PATTERN_UNCORR      0x61010101
  55
  56 inline static void disable_ecc(void)
  57 {
  58         uint32_t value;
  59
  60         sync(); /* Wait for any pending memory accesses to complete. */
  61         mfsdram(DDR0_22, value);
  62         mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
  63                 | DDR0_22_CTRL_RAW_ECC_DISABLE);
  64 }
  65
  66 inline static void clear_and_enable_ecc(void)
  67 {
  68         uint32_t value;
  69
  70         sync(); /* Wait for any pending memory accesses to complete. */
  71         mfsdram(DDR0_00, value);
  72         mtsdram(DDR0_00, value | DDR0_00_INT_ACK_ALL);
  73         mfsdram(DDR0_22, value);
  74         mtsdram(DDR0_22, (value & ~DDR0_22_CTRL_RAW_MASK)
  75                 | DDR0_22_CTRL_RAW_ECC_ENABLE);
  76 }
  77
  78 static uint32_t get_ecc_status(void)
  79 {
  80         uint32_t int_status;
  81 #if defined(DEBUG)
  82         uint8_t syndrome;
  83         uint32_t hdata, ldata, haddr, laddr;
  84         uint32_t value;
  85 #endif
  86
  87         mfsdram(DDR0_00, int_status);
  88         int_status &= DDR0_00_INT_STATUS_MASK;
  89
  90 #if defined(DEBUG)
  91         if (int_status & (DDR0_00_INT_STATUS_BIT0 | DDR0_00_INT_STATUS_BIT1)) {
  92                 mfsdram(DDR0_32, laddr);
  93                 mfsdram(DDR0_33, haddr);
  94                 haddr &= 0x00000001;
  95                 if (int_status & DDR0_00_INT_STATUS_BIT1)
  96                         debug("Multiple accesses");
  97                 else
  98                         debug("A single access");
  99
 100                 debug(" outside the defined physical memory space detected\n"
 101                       "        addr = 0x%01x%08x\n", haddr, laddr);
 102         }
 103         if (int_status & (DDR0_00_INT_STATUS_BIT2 | DDR0_00_INT_STATUS_BIT3)) {
 104                 unsigned int bit;
 105
 106                 mfsdram(DDR0_23, value);
 107                 syndrome = (value >> 16) & 0xff;
 108                 for (bit = 0; bit < sizeof(syndrome_codes); bit++)
 109                         if (syndrome_codes[bit] == syndrome)
 110                                 break;
 111
 112                 mfsdram(DDR0_38, laddr);
 113                 mfsdram(DDR0_39, haddr);
 114                 haddr &= 0x00000001;
 115                 mfsdram(DDR0_40, ldata);
 116                 mfsdram(DDR0_41, hdata);
 117                 if (int_status & DDR0_00_INT_STATUS_BIT3)
 118                         debug("Multiple correctable ECC events");
 119                 else
 120                         debug("Single correctable ECC event");
 121
 122                 debug(" detected\n        0x%01x%08x - 0x%08x%08x, bit - %d\n",
 123                       haddr, laddr, hdata, ldata, bit);
 124         }
 125         if (int_status & (DDR0_00_INT_STATUS_BIT4 | DDR0_00_INT_STATUS_BIT5)) {
 126                 mfsdram(DDR0_23, value);
 127                 syndrome = (value >> 8) & 0xff;
 128                 mfsdram(DDR0_34, laddr);
 129                 mfsdram(DDR0_35, haddr);
 130                 haddr &= 0x00000001;
 131                 mfsdram(DDR0_36, ldata);
 132                 mfsdram(DDR0_37, hdata);
 133                 if (int_status & DDR0_00_INT_STATUS_BIT5)
 134                         debug("Multiple uncorrectable ECC events");
 135                 else
 136                         debug("Single uncorrectable ECC event");
 137
 138                 debug(" detected\n        0x%01x%08x - 0x%08x%08x, "
 139                       "syndrome - 0x%02x\n",
 140                       haddr, laddr, hdata, ldata, syndrome);
 141         }
 142         if (int_status & DDR0_00_INT_STATUS_BIT6)
 143                 debug("DRAM initialization complete\n");
 144 #endif /* defined(DEBUG) */
 145
 146         return int_status;
 147 }
 148
 149 static int test_ecc(uint32_t ecc_addr)
 150 {
 151         uint32_t value;
 152         volatile uint32_t *const ecc_mem = (volatile uint32_t *)ecc_addr;
 153         int ret = 0;
 154
 155         WATCHDOG_RESET();
 156
 157         debug("Entering test_ecc(0x%08x)\n", ecc_addr);
 158         /* Set up correct ECC in memory */
 159         disable_ecc();
 160         clear_and_enable_ecc();
 161         out_be32(ecc_mem, ECC_PATTERN);
 162         out_be32(ecc_mem + 1, ECC_PATTERN);
 163         ppcDcbf((u32)ecc_mem);
 164
 165         /* Verify no ECC error reading back */
 166         value = in_be32(ecc_mem);
 167         disable_ecc();
 168         if (ECC_PATTERN != value) {
 169                 debug("Data read error (no-error case): "
 170                       "expected 0x%08x, read 0x%08x\n", ECC_PATTERN, value);
 171                 ret = 1;
 172         }
 173         value = get_ecc_status();
 174         if (0x00000000 != value) {
 175                 /* Expected no ECC status reported */
 176                 debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
 177                       0x00000000, value);
 178                 ret = 1;
 179         }
 180
 181         /* Test for correctable error by creating a one-bit error */
 182         out_be32(ecc_mem, ECC_PATTERN_CORR);
 183         ppcDcbf((u32)ecc_mem);
 184         clear_and_enable_ecc();
 185         value = in_be32(ecc_mem);
 186         disable_ecc();
 187         /* Test that the corrected data was read */
 188         if (ECC_PATTERN != value) {
 189                 debug("Data read error (correctable-error case): "
 190                       "expected 0x%08x, read 0x%08x\n", ECC_PATTERN, value);
 191                 ret = 1;
 192         }
 193         value = get_ecc_status();
 194         if ((DDR0_00_INT_STATUS_BIT2 | DDR0_00_INT_STATUS_BIT7) != value) {
 195                 /* Expected a single correctable error reported */
 196                 debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
 197                       DDR0_00_INT_STATUS_BIT2, value);
 198                 ret = 1;
 199         }
 200
 201         /* Test for uncorrectable error by creating a two-bit error */
 202         out_be32(ecc_mem, ECC_PATTERN_UNCORR);
 203         ppcDcbf((u32)ecc_mem);
 204         clear_and_enable_ecc();
 205         value = in_be32(ecc_mem);
 206         disable_ecc();
 207         /* Test that the corrected data was read */
 208         if (ECC_PATTERN_UNCORR != value) {
 209                 debug("Data read error (uncorrectable-error case): "
 210                       "expected 0x%08x, read 0x%08x\n", ECC_PATTERN_UNCORR,
 211                       value);
 212                 ret = 1;
 213         }
 214         value = get_ecc_status();
 215         if ((DDR0_00_INT_STATUS_BIT4 | DDR0_00_INT_STATUS_BIT7) != value) {
 216                 /* Expected a single uncorrectable error reported */
 217                 debug("get_ecc_status(): expected 0x%08x, got 0x%08x\n",
 218                       DDR0_00_INT_STATUS_BIT4, value);
 219                 ret = 1;
 220         }
 221
 222         /* Remove error from SDRAM and enable ECC. */
 223         out_be32(ecc_mem, ECC_PATTERN);
 224         ppcDcbf((u32)ecc_mem);
 225         clear_and_enable_ecc();
 226
 227         return ret;
 228 }
 229
 230 int ecc_post_test(int flags)
 231 {
 232         int ret = 0;
 233         uint32_t value;
 234         uint32_t iaddr;
 235
 236         mfsdram(DDR0_22, value);
 237         if (0x3 != DDR0_22_CTRL_RAW_DECODE(value)) {
 238                 debug("SDRAM ECC not enabled, skipping ECC POST.\n");
 239                 return 0;
 240         }
 241
 242         /* Mask all interrupts. */
 243         mfsdram(DDR0_01, value);
 244         mtsdram(DDR0_01, (value & ~DDR0_01_INT_MASK_MASK)
 245                 | DDR0_01_INT_MASK_ALL_OFF);
 246
 247         for (iaddr = ECC_START_ADDR; iaddr <= ECC_STOP_ADDR; iaddr += iaddr) {
 248                 ret = test_ecc(iaddr);
 249                 if (ret)
 250                         break;
 251         }
 252         /*
 253          * Clear possible errors resulting from ECC testing.  (If not done, we
 254          * we could get an interrupt later on when exceptions are enabled.)
 255          */
 256         set_mcsr(get_mcsr());
 257         debug("ecc_post_test() returning %d\n", ret);
 258         return ret;
 259 }
 260 #endif /* CONFIG_POST & CONFIG_SYS_POST_ECC */
 261 #endif /* defined(CONFIG_440EPX) || defined(CONFIG_440GRX) */