mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
e879c862fb
We only need to set the system up for a soft-restart if we're going to be doing a soft-restart. Provide a new function (soft_restart()) which does the setup and final call for this, and make platforms use it. Eliminate the call to setup_restart() from the default handler. This means that platforms arch_reset() function is no longer called with the page tables prepared for a soft-restart, and caches will still be enabled. Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Viresh Kumar <viresh.kumar@st.com> Acked-by: Krzysztof Ha■asa <khc@pm.waw.pl> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org> Acked-by: Wan ZongShun <mcuos.com@gmail.com> Acked-by: Eric Miao <eric.y.miao@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
103 lines
1.8 KiB
C
103 lines
1.8 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 <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 */
|
|
OWER = OWER_WME;
|
|
OSSR = OSSR_M3;
|
|
OSMR3 = OSCR + 368640; /* ... in 100 ms */
|
|
}
|
|
|
|
void arch_reset(char mode, const char *cmd)
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
|