src/lib/ramtest.c

   1 #include <stdint.h>
   2 #include <lib.h> /* Prototypes */
   3 #include <console/console.h>
   4
   5 static void write_phys(unsigned long addr, u32 value)
   6 {
   7         // Assembler in lib/ is very ugly. But we properly guarded
   8         // it so let's obey this one for now
   9 #if CONFIG_SSE2
  10         asm volatile(
  11                 "movnti %1, (%0)"
  12                 : /* outputs */
  13                 : "r" (addr), "r" (value) /* inputs */
  14 #ifndef __GNUC__ /* GCC does not like empty clobbers? */
  15                 : /* clobbers */
  16 #endif
  17                 );
  18 #else
  19         volatile unsigned long *ptr;
  20         ptr = (void *)addr;
  21         *ptr = value;
  22 #endif
  23 }
  24
  25 static u32 read_phys(unsigned long addr)
  26 {
  27         volatile unsigned long *ptr;
  28         ptr = (void *)addr;
  29         return *ptr;
  30 }
  31
  32 static void phys_memory_barrier(void)
  33 {
  34 #if CONFIG_SSE2
  35         // Needed for movnti
  36         asm volatile (
  37                 "sfence"
  38                 ::
  39 #ifdef __GNUC__ /* ROMCC does not like memory clobbers */
  40                 : "memory"
  41 #endif
  42         );
  43 #else
  44 #ifdef __GNUC__ /* ROMCC does not like empty asm statements */
  45         asm volatile ("" ::: "memory");
  46 #endif
  47 #endif
  48 }
  49
  50 static void ram_fill(unsigned long start, unsigned long stop)
  51 {
  52         unsigned long addr;
  53         /*
  54          * Fill.
  55          */
  56 #if !defined(__ROMCC__)
  57         printk(BIOS_DEBUG, "DRAM fill: 0x%08lx-0x%08lx\n", start, stop);
  58 #else
  59         print_debug("DRAM fill: ");
  60         print_debug_hex32(start);
  61         print_debug("-");
  62         print_debug_hex32(stop);
  63         print_debug("\n");
  64 #endif
  65         for(addr = start; addr < stop ; addr += 4) {
  66                 /* Display address being filled */
  67                 if (!(addr & 0xfffff)) {
  68 #if !defined(__ROMCC__)
  69                         printk(BIOS_DEBUG, "%08lx \r", addr);
  70 #else
  71                         print_debug_hex32(addr);
  72                         print_debug(" \r");
  73 #endif
  74                 }
  75                 write_phys(addr, (u32)addr);
  76         };
  77         /* Display final address */
  78 #if !defined(__ROMCC__)
  79         printk(BIOS_DEBUG, "%08lx\nDRAM filled\n", addr);
  80 #else
  81         print_debug_hex32(addr);
  82         print_debug("\nDRAM filled\n");
  83 #endif
  84 }
  85
  86 static void ram_verify(unsigned long start, unsigned long stop)
  87 {
  88         unsigned long addr;
  89         int i = 0;
  90         /*
  91          * Verify.
  92          */
  93 #if !defined(__ROMCC__)
  94         printk(BIOS_DEBUG, "DRAM verify: 0x%08lx-0x%08lx\n", start, stop);
  95 #else
  96         print_debug("DRAM verify: ");
  97         print_debug_hex32(start);
  98         print_debug_char('-');
  99         print_debug_hex32(stop);
 100         print_debug("\n");
 101 #endif
 102         for(addr = start; addr < stop ; addr += 4) {
 103                 unsigned long value;
 104                 /* Display address being tested */
 105                 if (!(addr & 0xfffff)) {
 106 #if !defined(__ROMCC__)
 107                         printk(BIOS_DEBUG, "%08lx \r", addr);
 108 #else
 109                         print_debug_hex32(addr);
 110                         print_debug(" \r");
 111 #endif
 112                 }
 113                 value = read_phys(addr);
 114                 if (value != addr) {
 115                         /* Display address with error */
 116 #if !defined(__ROMCC__)
 117                         printk(BIOS_ERR, "Fail: @0x%08lx Read value=0x%08lx\n", addr, value);
 118 #else
 119                         print_err("Fail: @0x");
 120                         print_err_hex32(addr);
 121                         print_err(" Read value=0x");
 122                         print_err_hex32(value);
 123                         print_err("\n");
 124 #endif
 125                         i++;
 126                         if(i>256) {
 127 #if !defined(__ROMCC__)
 128                                 printk(BIOS_DEBUG, "Aborting.\n");
 129 #else
 130                                 print_debug("Aborting.\n");
 131 #endif
 132                                 break;
 133                         }
 134                 }
 135         }
 136         /* Display final address */
 137 #if !defined(__ROMCC__)
 138         printk(BIOS_DEBUG, "%08lx", addr);
 139 #else
 140         print_debug_hex32(addr);
 141 #endif
 142
 143         if (i) {
 144 #if !defined(__ROMCC__)
 145                 printk(BIOS_DEBUG, "\nDRAM did _NOT_ verify!\n");
 146 #else
 147                 print_debug("\nDRAM did _NOT_ verify!\n");
 148 #endif
 149                 die("DRAM ERROR");
 150         }
 151         else {
 152 #if !defined(__ROMCC__)
 153                 printk(BIOS_DEBUG, "\nDRAM range verified.\n");
 154 #else
 155                 print_debug("\nDRAM range verified.\n");
 156 #endif
 157         }
 158 }
 159
 160
 161 void ram_check(unsigned long start, unsigned long stop)
 162 {
 163         /*
 164          * This is much more of a "Is my DRAM properly configured?"
 165          * test than a "Is my DRAM faulty?" test.  Not all bits
 166          * are tested.   -Tyson
 167          */
 168 #if !defined(__ROMCC__)
 169         printk(BIOS_DEBUG, "Testing DRAM : %08lx - %08lx\n", start, stop);
 170 #else
 171         print_debug("Testing DRAM : ");
 172         print_debug_hex32(start);
 173         print_debug("-");
 174         print_debug_hex32(stop);
 175         print_debug("\n");
 176 #endif
 177         ram_fill(start, stop);
 178         /* Make sure we don't read before we wrote */
 179         phys_memory_barrier();
 180         ram_verify(start, stop);
 181 #if !defined(__ROMCC__)
 182         printk(BIOS_DEBUG, "Done.\n");
 183 #else
 184         print_debug("Done.\n");
 185 #endif
 186 }
 187
 188 void quick_ram_check(void)
 189 {
 190         int fail = 0;
 191         u32 backup;
 192         backup = read_phys(CONFIG_RAMBASE);
 193         write_phys(CONFIG_RAMBASE, 0x55555555);
 194         phys_memory_barrier();
 195         if (read_phys(CONFIG_RAMBASE) != 0x55555555)
 196                 fail=1;
 197         write_phys(CONFIG_RAMBASE, 0xaaaaaaaa);
 198         phys_memory_barrier();
 199         if (read_phys(CONFIG_RAMBASE) != 0xaaaaaaaa)
 200                 fail=1;
 201         write_phys(CONFIG_RAMBASE, 0x00000000);
 202         phys_memory_barrier();
 203         if (read_phys(CONFIG_RAMBASE) != 0x00000000)
 204                 fail=1;
 205         write_phys(CONFIG_RAMBASE, 0xffffffff);
 206         phys_memory_barrier();
 207         if (read_phys(CONFIG_RAMBASE) != 0xffffffff)
 208                 fail=1;
 209
 210         write_phys(CONFIG_RAMBASE, backup);
 211         if (fail) {
 212                 post_code(0xea);
 213                 die("RAM INIT FAILURE!\n");
 214         }
 215         phys_memory_barrier();
 216 }
 217