cfda590178
Make a common device tree glue for clocksource/dw_apb_timer. Move mach-picoxcell/time.c to be a generic device tree application of the dw_apb_timer. Configure mach-picoxcell to use the dw_apb_timer_of device tree implementation in drivers/clocksource. Signed-off-by: Pavel Machek <pavel@denx.de> Signed-off-by: Dinh Nguyen <dinguyen@altera.com> Acked-by: Jamie Iles <jamie@jamieiles.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
105 lines
2.6 KiB
C
105 lines
2.6 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/irq.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/dw_apb_timer.h>
|
|
|
|
#include <asm/mach/arch.h>
|
|
#include <asm/hardware/vic.h>
|
|
#include <asm/mach/map.h>
|
|
|
|
#include <mach/map.h>
|
|
#include <mach/picoxcell_soc.h>
|
|
|
|
#include "common.h"
|
|
|
|
#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)
|
|
{
|
|
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
|
|
picoxcell_setup_restart();
|
|
}
|
|
|
|
static const char *picoxcell_dt_match[] = {
|
|
"picochip,pc3x2",
|
|
"picochip,pc3x3",
|
|
NULL
|
|
};
|
|
|
|
static const struct of_device_id vic_of_match[] __initconst = {
|
|
{ .compatible = "arm,pl192-vic", .data = vic_of_init, },
|
|
{ /* Sentinel */ }
|
|
};
|
|
|
|
static void __init picoxcell_init_irq(void)
|
|
{
|
|
of_irq_init(vic_of_match);
|
|
}
|
|
|
|
static void picoxcell_wdt_restart(char 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,
|
|
.nr_irqs = NR_IRQS_LEGACY,
|
|
.init_irq = picoxcell_init_irq,
|
|
.handle_irq = vic_handle_irq,
|
|
.timer = &dw_apb_timer,
|
|
.init_machine = picoxcell_init_machine,
|
|
.dt_compat = picoxcell_dt_match,
|
|
.restart = picoxcell_wdt_restart,
|
|
MACHINE_END
|