board-dt.c 1.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Author: Alexander Shiyan <shc_work@mail.ru>, 2016
  4. */
  5. #include <linux/io.h>
  6. #include <linux/of_fdt.h>
  7. #include <linux/platform_device.h>
  8. #include <linux/random.h>
  9. #include <linux/sizes.h>
  10. #include <linux/mfd/syscon/clps711x.h>
  11. #include <asm/system_info.h>
  12. #include <asm/system_misc.h>
  13. #include <asm/mach/arch.h>
  14. #include <asm/mach/map.h>
  15. #define CLPS711X_VIRT_BASE IOMEM(0xfeff4000)
  16. #define CLPS711X_PHYS_BASE (0x80000000)
  17. # define SYSFLG1 (0x0140)
  18. # define HALT (0x0800)
  19. # define UNIQID (0x2440)
  20. # define RANDID0 (0x2700)
  21. # define RANDID1 (0x2704)
  22. # define RANDID2 (0x2708)
  23. # define RANDID3 (0x270c)
  24. static struct map_desc clps711x_io_desc __initdata = {
  25. .virtual = (unsigned long)CLPS711X_VIRT_BASE,
  26. .pfn = __phys_to_pfn(CLPS711X_PHYS_BASE),
  27. .length = 48 * SZ_1K,
  28. .type = MT_DEVICE,
  29. };
  30. static void __init clps711x_map_io(void)
  31. {
  32. iotable_init(&clps711x_io_desc, 1);
  33. }
  34. static const struct resource clps711x_cpuidle_res =
  35. DEFINE_RES_MEM(CLPS711X_PHYS_BASE + HALT, SZ_128);
  36. static void __init clps711x_init(void)
  37. {
  38. u32 id[5];
  39. id[0] = readl(CLPS711X_VIRT_BASE + UNIQID);
  40. id[1] = readl(CLPS711X_VIRT_BASE + RANDID0);
  41. id[2] = readl(CLPS711X_VIRT_BASE + RANDID1);
  42. id[3] = readl(CLPS711X_VIRT_BASE + RANDID2);
  43. id[4] = readl(CLPS711X_VIRT_BASE + RANDID3);
  44. system_rev = SYSFLG1_VERID(readl(CLPS711X_VIRT_BASE + SYSFLG1));
  45. add_device_randomness(id, sizeof(id));
  46. system_serial_low = id[0];
  47. platform_device_register_simple("clps711x-cpuidle", PLATFORM_DEVID_NONE,
  48. &clps711x_cpuidle_res, 1);
  49. }
  50. static void clps711x_restart(enum reboot_mode mode, const char *cmd)
  51. {
  52. soft_restart(0);
  53. }
  54. static const char *const clps711x_compat[] __initconst = {
  55. "cirrus,ep7209",
  56. NULL
  57. };
  58. DT_MACHINE_START(CLPS711X_DT, "Cirrus Logic CLPS711X (Device Tree Support)")
  59. .dt_compat = clps711x_compat,
  60. .map_io = clps711x_map_io,
  61. .init_late = clps711x_init,
  62. .restart = clps711x_restart,
  63. MACHINE_END