kernel-ark/arch/arm/mach-pxa/reset.c
Russell King 3169663ac5 ARM: sa11x0/pxa: convert OS timer registers to IOMEM
Make the OS timer registers have IOMEM like properities so they can
be passed to readl_relaxed/writel_relaxed() et.al. rather than being
straight volatile dereferences.  Add linux/io.h includes where
required.

linux/io.h includes added to arch/arm/mach-sa1100/cpu-sa1100.c,
 arch/arm/mach-sa1100/jornada720_ssp.c, arch/arm/mach-sa1100/leds-lart.c
 drivers/input/touchscreen/jornada720_ts.c, drivers/pcmcia/sa1100_shannon.c
from Arnd.

This fixes these warnings:

arch/arm/mach-sa1100/time.c: In function 'sa1100_timer_init':
arch/arm/mach-sa1100/time.c:104: warning: passing argument 1 of 'clocksource_mmio_init' discards qualifiers from pointer target type
arch/arm/mach-pxa/time.c: In function 'pxa_timer_init':
arch/arm/mach-pxa/time.c:126: warning: passing argument 1 of 'clocksource_mmio_init' discards qualifiers from pointer target type

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-07-09 17:37:35 +01:00

108 lines
1.9 KiB
C

/*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <asm/proc-fns.h>
#include <asm/system_misc.h>
#include <mach/regs-ost.h>
#include <mach/reset.h>
unsigned int reset_status;
EXPORT_SYMBOL(reset_status);
static void do_hw_reset(void);
static int reset_gpio = -1;
int init_gpio_reset(int gpio, int output, int level)
{
int rc;
rc = gpio_request(gpio, "reset generator");
if (rc) {
printk(KERN_ERR "Can't request reset_gpio\n");
goto out;
}
if (output)
rc = gpio_direction_output(gpio, level);
else
rc = gpio_direction_input(gpio);
if (rc) {
printk(KERN_ERR "Can't configure reset_gpio\n");
gpio_free(gpio);
goto out;
}
out:
if (!rc)
reset_gpio = gpio;
return rc;
}
/*
* Trigger GPIO reset.
* This covers various types of logic connecting gpio pin
* to RESET pins (nRESET or GPIO_RESET):
*/
static void do_gpio_reset(void)
{
BUG_ON(reset_gpio == -1);
/* drive it low */
gpio_direction_output(reset_gpio, 0);
mdelay(2);
/* rising edge or drive high */
gpio_set_value(reset_gpio, 1);
mdelay(2);
/* falling edge */
gpio_set_value(reset_gpio, 0);
/* give it some time */
mdelay(10);
WARN_ON(1);
/* fallback */
do_hw_reset();
}
static void do_hw_reset(void)
{
/* Initialize the watchdog and let it fire */
writel_relaxed(OWER_WME, OWER);
writel_relaxed(OSSR_M3, OSSR);
/* ... in 100 ms */
writel_relaxed(readl_relaxed(OSCR) + 368640, OSMR3);
}
void pxa_restart(char mode, const char *cmd)
{
local_irq_disable();
local_fiq_disable();
clear_reset_status(RESET_STATUS_ALL);
switch (mode) {
case 's':
/* Jump into ROM at address 0 */
soft_restart(0);
break;
case 'g':
do_gpio_reset();
break;
case 'h':
default:
do_hw_reset();
break;
}
}