linux/arch/arm/mach-prima2/rstc.c
Robin Holt 7b6d864b48 reboot: arm: change reboot_mode to use enum reboot_mode
Preparing to move the parsing of reboot= to generic kernel code forces
the change in reboot_mode handling to use the enum.

[akpm@linux-foundation.org: fix arch/arm/mach-socfpga/socfpga.c]
Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Russ Anderson <rja@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-09 10:33:29 -07:00

91 lines
2.3 KiB
C

/*
* reset controller for CSR SiRFprimaII
*
* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
*
* Licensed under GPLv2 or later.
*/
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/reboot.h>
void __iomem *sirfsoc_rstc_base;
static DEFINE_MUTEX(rstc_lock);
static struct of_device_id rstc_ids[] = {
{ .compatible = "sirf,prima2-rstc" },
{ .compatible = "sirf,marco-rstc" },
{},
};
static int __init sirfsoc_of_rstc_init(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, rstc_ids);
if (!np) {
pr_err("unable to find compatible sirf rstc node in dtb\n");
return -ENOENT;
}
sirfsoc_rstc_base = of_iomap(np, 0);
if (!sirfsoc_rstc_base)
panic("unable to map rstc cpu registers\n");
of_node_put(np);
return 0;
}
early_initcall(sirfsoc_of_rstc_init);
int sirfsoc_reset_device(struct device *dev)
{
u32 reset_bit;
if (of_property_read_u32(dev->of_node, "reset-bit", &reset_bit))
return -EINVAL;
mutex_lock(&rstc_lock);
if (of_device_is_compatible(dev->of_node, "sirf,prima2-rstc")) {
/*
* Writing 1 to this bit resets corresponding block. Writing 0 to this
* bit de-asserts reset signal of the corresponding block.
* datasheet doesn't require explicit delay between the set and clear
* of reset bit. it could be shorter if tests pass.
*/
writel(readl(sirfsoc_rstc_base + (reset_bit / 32) * 4) | reset_bit,
sirfsoc_rstc_base + (reset_bit / 32) * 4);
msleep(10);
writel(readl(sirfsoc_rstc_base + (reset_bit / 32) * 4) & ~reset_bit,
sirfsoc_rstc_base + (reset_bit / 32) * 4);
} else {
/*
* For MARCO and POLO
* Writing 1 to SET register resets corresponding block. Writing 1 to CLEAR
* register de-asserts reset signal of the corresponding block.
* datasheet doesn't require explicit delay between the set and clear
* of reset bit. it could be shorter if tests pass.
*/
writel(reset_bit, sirfsoc_rstc_base + (reset_bit / 32) * 8);
msleep(10);
writel(reset_bit, sirfsoc_rstc_base + (reset_bit / 32) * 8 + 4);
}
mutex_unlock(&rstc_lock);
return 0;
}
#define SIRFSOC_SYS_RST_BIT BIT(31)
void sirfsoc_restart(enum reboot_mode mode, const char *cmd)
{
writel(SIRFSOC_SYS_RST_BIT, sirfsoc_rstc_base);
}