1006fae359
Pull IRQ changes from Ingo Molnar:
"The biggest change this cycle are the softirq/hardirq stack
interaction and nesting fixes, cleanups and reorganizations from
Frederic. This is the longer followup story to the softirq nesting
fix that is already upstream (commit ded7975475: "irq: Force hardirq
exit's softirq processing on its own stack")"
* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip: bcm2835: Convert to use IRQCHIP_DECLARE macro
powerpc: Tell about irq stack coverage
x86: Tell about irq stack coverage
irq: Optimize softirq stack selection in irq exit
irq: Justify the various softirq stack choices
irq: Improve a bit softirq debugging
irq: Optimize call to softirq on hardirq exit
irq: Consolidate do_softirq() arch overriden implementations
x86/irq: Correct comment about i8259 initialization
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2010 Broadcom
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/irqchip.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/clk/bcm2835.h>
|
|
|
|
#include <asm/mach/arch.h>
|
|
#include <asm/mach/map.h>
|
|
|
|
#define PM_RSTC 0x1c
|
|
#define PM_RSTS 0x20
|
|
#define PM_WDOG 0x24
|
|
|
|
#define PM_PASSWORD 0x5a000000
|
|
#define PM_RSTC_WRCFG_MASK 0x00000030
|
|
#define PM_RSTC_WRCFG_FULL_RESET 0x00000020
|
|
#define PM_RSTS_HADWRH_SET 0x00000040
|
|
|
|
#define BCM2835_PERIPH_PHYS 0x20000000
|
|
#define BCM2835_PERIPH_VIRT 0xf0000000
|
|
#define BCM2835_PERIPH_SIZE SZ_16M
|
|
|
|
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 bcm2835_setup_restart(void)
|
|
{
|
|
struct device_node *np = of_find_compatible_node(NULL, NULL,
|
|
"brcm,bcm2835-pm-wdt");
|
|
if (WARN(!np, "unable to setup watchdog restart"))
|
|
return;
|
|
|
|
wdt_regs = of_iomap(np, 0);
|
|
WARN(!wdt_regs, "failed to remap watchdog regs");
|
|
}
|
|
|
|
static void bcm2835_restart(enum reboot_mode mode, const char *cmd)
|
|
{
|
|
u32 val;
|
|
|
|
if (!wdt_regs)
|
|
return;
|
|
|
|
/* use a timeout of 10 ticks (~150us) */
|
|
writel_relaxed(10 | PM_PASSWORD, wdt_regs + PM_WDOG);
|
|
val = readl_relaxed(wdt_regs + PM_RSTC);
|
|
val &= ~PM_RSTC_WRCFG_MASK;
|
|
val |= PM_PASSWORD | PM_RSTC_WRCFG_FULL_RESET;
|
|
writel_relaxed(val, wdt_regs + PM_RSTC);
|
|
|
|
/* No sleeping, possibly atomic. */
|
|
mdelay(1);
|
|
}
|
|
|
|
/*
|
|
* We can't really power off, but if we do the normal reset scheme, and
|
|
* indicate to bootcode.bin not to reboot, then most of the chip will be
|
|
* powered off.
|
|
*/
|
|
static void bcm2835_power_off(void)
|
|
{
|
|
u32 val;
|
|
|
|
/*
|
|
* We set the watchdog hard reset bit here to distinguish this reset
|
|
* from the normal (full) reset. bootcode.bin will not reboot after a
|
|
* hard reset.
|
|
*/
|
|
val = readl_relaxed(wdt_regs + PM_RSTS);
|
|
val &= ~PM_RSTC_WRCFG_MASK;
|
|
val |= PM_PASSWORD | PM_RSTS_HADWRH_SET;
|
|
writel_relaxed(val, wdt_regs + PM_RSTS);
|
|
|
|
/* Continue with normal reset mechanism */
|
|
bcm2835_restart(REBOOT_HARD, "");
|
|
}
|
|
|
|
static struct map_desc io_map __initdata = {
|
|
.virtual = BCM2835_PERIPH_VIRT,
|
|
.pfn = __phys_to_pfn(BCM2835_PERIPH_PHYS),
|
|
.length = BCM2835_PERIPH_SIZE,
|
|
.type = MT_DEVICE
|
|
};
|
|
|
|
static void __init bcm2835_map_io(void)
|
|
{
|
|
iotable_init(&io_map, 1);
|
|
}
|
|
|
|
static void __init bcm2835_init(void)
|
|
{
|
|
int ret;
|
|
|
|
bcm2835_setup_restart();
|
|
if (wdt_regs)
|
|
pm_power_off = bcm2835_power_off;
|
|
|
|
bcm2835_init_clocks();
|
|
|
|
ret = of_platform_populate(NULL, of_default_bus_match_table, NULL,
|
|
NULL);
|
|
if (ret) {
|
|
pr_err("of_platform_populate failed: %d\n", ret);
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static const char * const bcm2835_compat[] = {
|
|
"brcm,bcm2835",
|
|
NULL
|
|
};
|
|
|
|
DT_MACHINE_START(BCM2835, "BCM2835")
|
|
.map_io = bcm2835_map_io,
|
|
.init_irq = irqchip_init,
|
|
.init_machine = bcm2835_init,
|
|
.restart = bcm2835_restart,
|
|
.dt_compat = bcm2835_compat
|
|
MACHINE_END
|