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