treeboot-akebono.c 3.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright © 2013 Tony Breeds IBM Corporation
  4. * Copyright © 2013 Alistair Popple IBM Corporation
  5. *
  6. * Based on earlier code:
  7. * Copyright (C) Paul Mackerras 1997.
  8. *
  9. * Matt Porter <mporter@kernel.crashing.org>
  10. * Copyright 2002-2005 MontaVista Software Inc.
  11. *
  12. * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13. * Copyright (c) 2003, 2004 Zultys Technologies
  14. *
  15. * Copyright 2007 David Gibson, IBM Corporation.
  16. * Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
  17. * Copyright © 2011 David Kleikamp IBM Corporation
  18. */
  19. #include <stdarg.h>
  20. #include <stddef.h>
  21. #include "types.h"
  22. #include "elf.h"
  23. #include "string.h"
  24. #include "stdlib.h"
  25. #include "stdio.h"
  26. #include "page.h"
  27. #include "ops.h"
  28. #include "reg.h"
  29. #include "io.h"
  30. #include "dcr.h"
  31. #include "4xx.h"
  32. #include "44x.h"
  33. #include "libfdt.h"
  34. BSS_STACK(4096);
  35. #define SPRN_PIR 0x11E /* Processor Identification Register */
  36. #define USERDATA_LEN 256 /* Length of userdata passed in by PIBS */
  37. #define MAX_RANKS 0x4
  38. #define DDR3_MR0CF 0x80010011U
  39. #define CCTL0_MCO2 0x8000080FU
  40. #define CCTL0_MCO3 0x80000810U
  41. #define CCTL0_MCO4 0x80000811U
  42. #define CCTL0_MCO5 0x80000812U
  43. #define CCTL0_MCO6 0x80000813U
  44. static unsigned long long ibm_akebono_memsize;
  45. static long long unsigned mac_addr;
  46. static unsigned long long ibm_akebono_detect_memsize(void)
  47. {
  48. u32 reg;
  49. unsigned i;
  50. unsigned long long memsize = 0;
  51. for (i = 0; i < MAX_RANKS; i++) {
  52. reg = mfdcrx(DDR3_MR0CF + i);
  53. if (!(reg & 1))
  54. continue;
  55. reg &= 0x0000f000;
  56. reg >>= 12;
  57. memsize += (0x800000ULL << reg);
  58. }
  59. return memsize;
  60. }
  61. static void ibm_akebono_fixups(void)
  62. {
  63. void *emac;
  64. u32 reg;
  65. dt_fixup_memory(0x0ULL, ibm_akebono_memsize);
  66. /* Fixup the SD timeout frequency */
  67. mtdcrx(CCTL0_MCO4, 0x1);
  68. /* Disable SD high-speed mode (which seems to be broken) */
  69. reg = mfdcrx(CCTL0_MCO2) & ~0x2;
  70. mtdcrx(CCTL0_MCO2, reg);
  71. /* Set the MAC address */
  72. emac = finddevice("/plb/opb/ethernet");
  73. if (emac > 0) {
  74. if (mac_addr)
  75. setprop(emac, "local-mac-address",
  76. ((u8 *) &mac_addr) + 2 , 6);
  77. }
  78. }
  79. void platform_init(char *userdata)
  80. {
  81. unsigned long end_of_ram, avail_ram;
  82. u32 pir_reg;
  83. int node, size;
  84. const u32 *timebase;
  85. int len, i, userdata_len;
  86. char *end;
  87. userdata[USERDATA_LEN - 1] = '\0';
  88. userdata_len = strlen(userdata);
  89. for (i = 0; i < userdata_len - 15; i++) {
  90. if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
  91. if (i > 0 && userdata[i - 1] != ' ') {
  92. /* We've only found a substring ending
  93. * with local-mac-addr so this isn't
  94. * our mac address. */
  95. continue;
  96. }
  97. mac_addr = strtoull(&userdata[i + 15], &end, 16);
  98. /* Remove the "local-mac-addr=<...>" from the kernel
  99. * command line, including the tailing space if
  100. * present. */
  101. if (*end == ' ')
  102. end++;
  103. len = ((int) end) - ((int) &userdata[i]);
  104. memmove(&userdata[i], end,
  105. userdata_len - (len + i) + 1);
  106. break;
  107. }
  108. }
  109. loader_info.cmdline = userdata;
  110. loader_info.cmdline_len = 256;
  111. ibm_akebono_memsize = ibm_akebono_detect_memsize();
  112. if (ibm_akebono_memsize >> 32)
  113. end_of_ram = ~0UL;
  114. else
  115. end_of_ram = ibm_akebono_memsize;
  116. avail_ram = end_of_ram - (unsigned long)_end;
  117. simple_alloc_init(_end, avail_ram, 128, 64);
  118. platform_ops.fixups = ibm_akebono_fixups;
  119. platform_ops.exit = ibm44x_dbcr_reset;
  120. pir_reg = mfspr(SPRN_PIR);
  121. /* Make sure FDT blob is sane */
  122. if (fdt_check_header(_dtb_start) != 0)
  123. fatal("Invalid device tree blob\n");
  124. node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
  125. "cpu", sizeof("cpu"));
  126. if (!node)
  127. fatal("Cannot find cpu node\n");
  128. timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
  129. if (timebase && (size == 4))
  130. timebase_period_ns = 1000000000 / *timebase;
  131. fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
  132. fdt_init(_dtb_start);
  133. serial_console_init();
  134. }