/arch/mips/jz4740/setup.c

http://github.com/mirrors/linux · C · 107 lines · 81 code · 20 blank · 6 comment · 9 complexity · 81dbb40fb5a6725480f4c803af80fd03 MD5 · raw file

  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
  4. * Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
  5. * JZ4740 setup code
  6. */
  7. #include <linux/init.h>
  8. #include <linux/io.h>
  9. #include <linux/irqchip.h>
  10. #include <linux/kernel.h>
  11. #include <linux/libfdt.h>
  12. #include <linux/of_fdt.h>
  13. #include <asm/bootinfo.h>
  14. #include <asm/prom.h>
  15. #include "reset.h"
  16. #define JZ4740_EMC_BASE_ADDR 0x13010000
  17. #define JZ4740_EMC_SDRAM_CTRL 0x80
  18. static void __init jz4740_detect_mem(void)
  19. {
  20. void __iomem *jz_emc_base;
  21. u32 ctrl, bus, bank, rows, cols;
  22. phys_addr_t size;
  23. jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
  24. ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
  25. bus = 2 - ((ctrl >> 31) & 1);
  26. bank = 1 + ((ctrl >> 19) & 1);
  27. cols = 8 + ((ctrl >> 26) & 7);
  28. rows = 11 + ((ctrl >> 20) & 3);
  29. printk(KERN_DEBUG
  30. "SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
  31. bus, bank, rows, cols);
  32. iounmap(jz_emc_base);
  33. size = 1 << (bus + bank + cols + rows);
  34. add_memory_region(0, size, BOOT_MEM_RAM);
  35. }
  36. static unsigned long __init get_board_mach_type(const void *fdt)
  37. {
  38. if (!fdt_node_check_compatible(fdt, 0, "ingenic,x1830"))
  39. return MACH_INGENIC_X1830;
  40. if (!fdt_node_check_compatible(fdt, 0, "ingenic,x1000"))
  41. return MACH_INGENIC_X1000;
  42. if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
  43. return MACH_INGENIC_JZ4780;
  44. if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
  45. return MACH_INGENIC_JZ4770;
  46. return MACH_INGENIC_JZ4740;
  47. }
  48. void __init plat_mem_setup(void)
  49. {
  50. int offset;
  51. void *dtb;
  52. jz4740_reset_init();
  53. if (__dtb_start != __dtb_end)
  54. dtb = __dtb_start;
  55. else
  56. dtb = (void *)fw_passed_dtb;
  57. __dt_setup_arch(dtb);
  58. offset = fdt_path_offset(dtb, "/memory");
  59. if (offset < 0)
  60. jz4740_detect_mem();
  61. mips_machtype = get_board_mach_type(dtb);
  62. }
  63. void __init device_tree_init(void)
  64. {
  65. if (!initial_boot_params)
  66. return;
  67. unflatten_and_copy_device_tree();
  68. }
  69. const char *get_system_type(void)
  70. {
  71. switch (mips_machtype) {
  72. case MACH_INGENIC_X1830:
  73. return "X1830";
  74. case MACH_INGENIC_X1000:
  75. return "X1000";
  76. case MACH_INGENIC_JZ4780:
  77. return "JZ4780";
  78. case MACH_INGENIC_JZ4770:
  79. return "JZ4770";
  80. default:
  81. return "JZ4740";
  82. }
  83. }
  84. void __init arch_init_irq(void)
  85. {
  86. irqchip_init();
  87. }