of.c 2.8 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116
  1. /*
  2. * This program is free software; you can redistribute it and/or modify it
  3. * under the terms of the GNU General Public License version 2 as published
  4. * by the Free Software Foundation.
  5. *
  6. * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  7. * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
  8. * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  9. */
  10. #include <linux/io.h>
  11. #include <linux/clk.h>
  12. #include <linux/init.h>
  13. #include <linux/sizes.h>
  14. #include <linux/of_fdt.h>
  15. #include <linux/kernel.h>
  16. #include <linux/bootmem.h>
  17. #include <linux/of_platform.h>
  18. #include <linux/of_address.h>
  19. #include <asm/reboot.h>
  20. #include <asm/bootinfo.h>
  21. #include <asm/addrspace.h>
  22. #include "common.h"
  23. __iomem void *rt_sysc_membase;
  24. __iomem void *rt_memc_membase;
  25. extern struct boot_param_header __dtb_start;
  26. __iomem void *plat_of_remap_node(const char *node)
  27. {
  28. struct resource res;
  29. struct device_node *np;
  30. np = of_find_compatible_node(NULL, NULL, node);
  31. if (!np)
  32. panic("Failed to find %s node", node);
  33. if (of_address_to_resource(np, 0, &res))
  34. panic("Failed to get resource for %s", node);
  35. if ((request_mem_region(res.start,
  36. resource_size(&res),
  37. res.name) < 0))
  38. panic("Failed to request resources for %s", node);
  39. return ioremap_nocache(res.start, resource_size(&res));
  40. }
  41. void __init device_tree_init(void)
  42. {
  43. unsigned long base, size;
  44. void *fdt_copy;
  45. if (!initial_boot_params)
  46. return;
  47. base = virt_to_phys((void *)initial_boot_params);
  48. size = be32_to_cpu(initial_boot_params->totalsize);
  49. /* Before we do anything, lets reserve the dt blob */
  50. reserve_bootmem(base, size, BOOTMEM_DEFAULT);
  51. /* The strings in the flattened tree are referenced directly by the
  52. * device tree, so copy the flattened device tree from init memory
  53. * to regular memory.
  54. */
  55. fdt_copy = alloc_bootmem(size);
  56. memcpy(fdt_copy, initial_boot_params, size);
  57. initial_boot_params = fdt_copy;
  58. unflatten_device_tree();
  59. /* free the space reserved for the dt blob */
  60. free_bootmem(base, size);
  61. }
  62. void __init plat_mem_setup(void)
  63. {
  64. set_io_port_base(KSEG1);
  65. /*
  66. * Load the builtin devicetree. This causes the chosen node to be
  67. * parsed resulting in our memory appearing
  68. */
  69. __dt_setup_arch(&__dtb_start);
  70. if (soc_info.mem_size)
  71. add_memory_region(soc_info.mem_base, soc_info.mem_size,
  72. BOOT_MEM_RAM);
  73. else
  74. detect_memory_region(soc_info.mem_base,
  75. soc_info.mem_size_min * SZ_1M,
  76. soc_info.mem_size_max * SZ_1M);
  77. }
  78. static int __init plat_of_setup(void)
  79. {
  80. static struct of_device_id of_ids[3];
  81. int len = sizeof(of_ids[0].compatible);
  82. if (!of_have_populated_dt())
  83. panic("device tree not present");
  84. strncpy(of_ids[0].compatible, soc_info.compatible, len);
  85. strncpy(of_ids[1].compatible, "palmbus", len);
  86. if (of_platform_populate(NULL, of_ids, NULL, NULL))
  87. panic("failed to populate DT\n");
  88. return 0;
  89. }
  90. arch_initcall(plat_of_setup);