treeboot-iss4xx.c 1.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
  4. *
  5. * Based on earlier code:
  6. * Copyright (C) Paul Mackerras 1997.
  7. *
  8. * Matt Porter <mporter@kernel.crashing.org>
  9. * Copyright 2002-2005 MontaVista Software Inc.
  10. *
  11. * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  12. * Copyright (c) 2003, 2004 Zultys Technologies
  13. *
  14. * Copyright 2007 David Gibson, IBM Corporation.
  15. */
  16. #include <stdarg.h>
  17. #include <stddef.h>
  18. #include "types.h"
  19. #include "elf.h"
  20. #include "string.h"
  21. #include "stdio.h"
  22. #include "page.h"
  23. #include "ops.h"
  24. #include "reg.h"
  25. #include "io.h"
  26. #include "dcr.h"
  27. #include "4xx.h"
  28. #include "44x.h"
  29. #include "libfdt.h"
  30. BSS_STACK(4096);
  31. static u32 ibm4xx_memstart;
  32. static void iss_4xx_fixups(void)
  33. {
  34. void *memory;
  35. u32 reg[3];
  36. memory = finddevice("/memory");
  37. if (!memory)
  38. fatal("Can't find memory node\n");
  39. /* This assumes #address-cells = 2, #size-cells =1 and that */
  40. getprop(memory, "reg", reg, sizeof(reg));
  41. if (reg[2])
  42. /* If the device tree specifies the memory range, use it */
  43. ibm4xx_memstart = reg[1];
  44. else
  45. /* othersize, read it from the SDRAM controller */
  46. ibm4xx_sdram_fixup_memsize();
  47. }
  48. static void *iss_4xx_vmlinux_alloc(unsigned long size)
  49. {
  50. return (void *)ibm4xx_memstart;
  51. }
  52. #define SPRN_PIR 0x11E /* Processor Identification Register */
  53. void platform_init(void)
  54. {
  55. unsigned long end_of_ram = 0x08000000;
  56. unsigned long avail_ram = end_of_ram - (unsigned long)_end;
  57. u32 pir_reg;
  58. simple_alloc_init(_end, avail_ram, 128, 64);
  59. platform_ops.fixups = iss_4xx_fixups;
  60. platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
  61. platform_ops.exit = ibm44x_dbcr_reset;
  62. pir_reg = mfspr(SPRN_PIR);
  63. fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
  64. fdt_init(_dtb_start);
  65. serial_console_init();
  66. }