91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/*
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* (Hisilicon's SoC based) flattened device tree enabled machine
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*
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* Copyright (c) 2012-2013 Hisilicon Ltd.
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* Copyright (c) 2012-2013 Linaro Ltd.
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*
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* Author: Haojian Zhuang <haojian.zhuang@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clocksource.h>
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#include <linux/irqchip.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <asm/proc-fns.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "core.h"
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#define HI3620_SYSCTRL_PHYS_BASE 0xfc802000
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#define HI3620_SYSCTRL_VIRT_BASE 0xfe802000
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/*
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* This table is only for optimization. Since ioremap() could always share
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* the same mapping if it's defined as static IO mapping.
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*
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* Without this table, system could also work. The cost is some virtual address
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* spaces wasted since ioremap() may be called multi times for the same
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* IO space.
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*/
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static struct map_desc hi3620_io_desc[] __initdata = {
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{
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/* sysctrl */
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.pfn = __phys_to_pfn(HI3620_SYSCTRL_PHYS_BASE),
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.virtual = HI3620_SYSCTRL_VIRT_BASE,
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.length = 0x1000,
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.type = MT_DEVICE,
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},
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};
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static void __init hi3620_map_io(void)
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{
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debug_ll_io_init();
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iotable_init(hi3620_io_desc, ARRAY_SIZE(hi3620_io_desc));
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}
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static void hi3xxx_restart(enum reboot_mode mode, const char *cmd)
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{
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struct device_node *np;
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void __iomem *base;
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int offset;
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np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
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if (!np) {
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pr_err("failed to find hisilicon,sysctrl node\n");
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return;
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}
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base = of_iomap(np, 0);
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if (!base) {
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pr_err("failed to map address in hisilicon,sysctrl node\n");
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return;
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}
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if (of_property_read_u32(np, "reboot-offset", &offset) < 0) {
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pr_err("failed to find reboot-offset property\n");
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return;
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}
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writel_relaxed(0xdeadbeef, base + offset);
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while (1)
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cpu_do_idle();
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}
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static const char *hi3xxx_compat[] __initconst = {
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"hisilicon,hi3620-hi4511",
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NULL,
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};
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DT_MACHINE_START(HI3620, "Hisilicon Hi3620 (Flattened Device Tree)")
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.map_io = hi3620_map_io,
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.dt_compat = hi3xxx_compat,
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.smp = smp_ops(hi3xxx_smp_ops),
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.restart = hi3xxx_restart,
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MACHINE_END
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