arch/arm/mach-hisi/hisilicon.c

   1 /*
   2  * (Hisilicon's SoC based) flattened device tree enabled machine
   3  *
   4  * Copyright (c) 2012-2013 Hisilicon Ltd.
   5  * Copyright (c) 2012-2013 Linaro Ltd.
   6  *
   7  * Author: Haojian Zhuang <haojian.zhuang@linaro.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12 */
  13
  14 #include <linux/clk-provider.h>
  15 #include <linux/clocksource.h>
  16 #include <linux/irqchip.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_platform.h>
  19
  20 #include <asm/proc-fns.h>
  21
  22 #include <asm/mach/arch.h>
  23 #include <asm/mach/map.h>
  24
  25 #include "core.h"
  26
  27 #define HI3620_SYSCTRL_PHYS_BASE                0xfc802000
  28 #define HI3620_SYSCTRL_VIRT_BASE                0xfe802000
  29
  30 /*
  31  * This table is only for optimization. Since ioremap() could always share
  32  * the same mapping if it's defined as static IO mapping.
  33  *
  34  * Without this table, system could also work. The cost is some virtual address
  35  * spaces wasted since ioremap() may be called multi times for the same
  36  * IO space.
  37  */
  38 static struct map_desc hi3620_io_desc[] __initdata = {
  39         {
  40                 /* sysctrl */
  41                 .pfn            = __phys_to_pfn(HI3620_SYSCTRL_PHYS_BASE),
  42                 .virtual        = HI3620_SYSCTRL_VIRT_BASE,
  43                 .length         = 0x1000,
  44                 .type           = MT_DEVICE,
  45         },
  46 };
  47
  48 static void __init hi3620_map_io(void)
  49 {
  50         debug_ll_io_init();
  51         iotable_init(hi3620_io_desc, ARRAY_SIZE(hi3620_io_desc));
  52 }
  53
  54 static void hi3xxx_restart(enum reboot_mode mode, const char *cmd)
  55 {
  56         struct device_node *np;
  57         void __iomem *base;
  58         int offset;
  59
  60         np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
  61         if (!np) {
  62                 pr_err("failed to find hisilicon,sysctrl node\n");
  63                 return;
  64         }
  65         base = of_iomap(np, 0);
  66         if (!base) {
  67                 pr_err("failed to map address in hisilicon,sysctrl node\n");
  68                 return;
  69         }
  70         if (of_property_read_u32(np, "reboot-offset", &offset) < 0) {
  71                 pr_err("failed to find reboot-offset property\n");
  72                 return;
  73         }
  74         writel_relaxed(0xdeadbeef, base + offset);
  75
  76         while (1)
  77                 cpu_do_idle();
  78 }
  79
  80 static const char *hi3xxx_compat[] __initconst = {
  81         "hisilicon,hi3620-hi4511",
  82         NULL,
  83 };
  84
  85 DT_MACHINE_START(HI3620, "Hisilicon Hi3620 (Flattened Device Tree)")
  86         .map_io         = hi3620_map_io,
  87         .dt_compat      = hi3xxx_compat,
  88         .smp            = smp_ops(hi3xxx_smp_ops),
  89         .restart        = hi3xxx_restart,
  90 MACHINE_END