linux-stable/arch/arm/mach-picoxcell/common.c
Kefeng Wang 850bea2335 arm: Remove unnecessary of_platform_populate with default match table
After patch "of/platform: Add common method to populate default bus",
it is possible for arch code to remove unnecessary callers of
of_platform_populate with default match table.

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Lee Jones <lee@kernel.org>
Cc: Krzysztof Halasa <khalasa@piap.pl>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Santosh Shilimkar <ssantosh@kernel.org>
Cc: Roland Stigge <stigge@antcom.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Viresh Kumar <vireshk@kernel.org>
Cc: Shiraz Hashim <shiraz.linux.kernel@gmail.com>
Cc: Tony Prisk <linux@prisktech.co.nz>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Rob Herring <robh@kernel.org>
2016-06-23 14:58:37 -05:00

84 lines
2.1 KiB
C

/*
* Copyright (c) 2011 Picochip Ltd., Jamie Iles
*
* 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.
*
* All enquiries to support@picochip.com
*/
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/reboot.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#define PHYS_TO_IO(x) (((x) & 0x00ffffff) | 0xfe000000)
#define PICOXCELL_PERIPH_BASE 0x80000000
#define PICOXCELL_PERIPH_LENGTH SZ_4M
#define WDT_CTRL_REG_EN_MASK (1 << 0)
#define WDT_CTRL_REG_OFFS (0x00)
#define WDT_TIMEOUT_REG_OFFS (0x04)
static void __iomem *wdt_regs;
/*
* The machine restart method can be called from an atomic context so we won't
* be able to ioremap the regs then.
*/
static void picoxcell_setup_restart(void)
{
struct device_node *np = of_find_compatible_node(NULL, NULL,
"snps,dw-apb-wdg");
if (WARN(!np, "unable to setup watchdog restart"))
return;
wdt_regs = of_iomap(np, 0);
WARN(!wdt_regs, "failed to remap watchdog regs");
}
static struct map_desc io_map __initdata = {
.virtual = PHYS_TO_IO(PICOXCELL_PERIPH_BASE),
.pfn = __phys_to_pfn(PICOXCELL_PERIPH_BASE),
.length = PICOXCELL_PERIPH_LENGTH,
.type = MT_DEVICE,
};
static void __init picoxcell_map_io(void)
{
iotable_init(&io_map, 1);
}
static void __init picoxcell_init_machine(void)
{
picoxcell_setup_restart();
}
static const char *picoxcell_dt_match[] = {
"picochip,pc3x2",
"picochip,pc3x3",
NULL
};
static void picoxcell_wdt_restart(enum reboot_mode mode, const char *cmd)
{
/*
* Configure the watchdog to reset with the shortest possible timeout
* and give it chance to do the reset.
*/
if (wdt_regs) {
writel_relaxed(WDT_CTRL_REG_EN_MASK, wdt_regs + WDT_CTRL_REG_OFFS);
writel_relaxed(0, wdt_regs + WDT_TIMEOUT_REG_OFFS);
/* No sleeping, possibly atomic. */
mdelay(500);
}
}
DT_MACHINE_START(PICOXCELL, "Picochip picoXcell")
.map_io = picoxcell_map_io,
.init_machine = picoxcell_init_machine,
.dt_compat = picoxcell_dt_match,
.restart = picoxcell_wdt_restart,
MACHINE_END