arch/arm/mach-clps711x/board-dt.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Author: Alexander Shiyan <shc_work@mail.ru>, 2016
   4  */
   5
   6 #include <linux/io.h>
   7 #include <linux/of_fdt.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/random.h>
  10 #include <linux/sizes.h>
  11
  12 #include <linux/mfd/syscon/clps711x.h>
  13
  14 #include <asm/system_info.h>
  15 #include <asm/system_misc.h>
  16 #include <asm/mach/arch.h>
  17 #include <asm/mach/map.h>
  18
  19 #define CLPS711X_VIRT_BASE      IOMEM(0xfeff4000)
  20 #define CLPS711X_PHYS_BASE      (0x80000000)
  21 # define SYSFLG1                (0x0140)
  22 # define HALT                   (0x0800)
  23 # define UNIQID                 (0x2440)
  24 # define RANDID0                (0x2700)
  25 # define RANDID1                (0x2704)
  26 # define RANDID2                (0x2708)
  27 # define RANDID3                (0x270c)
  28
  29 static struct map_desc clps711x_io_desc __initdata = {
  30         .virtual        = (unsigned long)CLPS711X_VIRT_BASE,
  31         .pfn            = __phys_to_pfn(CLPS711X_PHYS_BASE),
  32         .length         = 48 * SZ_1K,
  33         .type           = MT_DEVICE,
  34 };
  35
  36 static void __init clps711x_map_io(void)
  37 {
  38         iotable_init(&clps711x_io_desc, 1);
  39 }
  40
  41 static const struct resource clps711x_cpuidle_res =
  42         DEFINE_RES_MEM(CLPS711X_PHYS_BASE + HALT, SZ_128);
  43
  44 static void __init clps711x_init(void)
  45 {
  46         u32 id[5];
  47
  48         id[0] = readl(CLPS711X_VIRT_BASE + UNIQID);
  49         id[1] = readl(CLPS711X_VIRT_BASE + RANDID0);
  50         id[2] = readl(CLPS711X_VIRT_BASE + RANDID1);
  51         id[3] = readl(CLPS711X_VIRT_BASE + RANDID2);
  52         id[4] = readl(CLPS711X_VIRT_BASE + RANDID3);
  53         system_rev = SYSFLG1_VERID(readl(CLPS711X_VIRT_BASE + SYSFLG1));
  54
  55         add_device_randomness(id, sizeof(id));
  56
  57         system_serial_low = id[0];
  58
  59         platform_device_register_simple("clps711x-cpuidle", PLATFORM_DEVID_NONE,
  60                                         &clps711x_cpuidle_res, 1);
  61 }
  62
  63 static void clps711x_restart(enum reboot_mode mode, const char *cmd)
  64 {
  65         soft_restart(0);
  66 }
  67
  68 static const char *const clps711x_compat[] __initconst = {
  69         "cirrus,ep7209",
  70         NULL
  71 };
  72
  73 DT_MACHINE_START(CLPS711X_DT, "Cirrus Logic CLPS711X (Device Tree Support)")
  74         .dt_compat      = clps711x_compat,
  75         .map_io         = clps711x_map_io,
  76         .init_late      = clps711x_init,
  77         .restart        = clps711x_restart,
  78 MACHINE_END