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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/arm/mach-pxa/reset.c
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/delay.h>
9 #include <linux/gpio.h>
11 #include <asm/proc-fns.h>
13 #include <mach/regs-ost.h>
14 #include <mach/reset.h>
16 unsigned int reset_status
;
17 EXPORT_SYMBOL(reset_status
);
19 static void do_hw_reset(void);
21 static int reset_gpio
= -1;
23 int init_gpio_reset(int gpio
, int output
, int level
)
27 rc
= gpio_request(gpio
, "reset generator");
29 printk(KERN_ERR
"Can't request reset_gpio\n");
34 rc
= gpio_direction_output(gpio
, level
);
36 rc
= gpio_direction_input(gpio
);
38 printk(KERN_ERR
"Can't configure reset_gpio\n");
52 * This covers various types of logic connecting gpio pin
53 * to RESET pins (nRESET or GPIO_RESET):
55 static void do_gpio_reset(void)
57 BUG_ON(reset_gpio
== -1);
60 gpio_direction_output(reset_gpio
, 0);
62 /* rising edge or drive high */
63 gpio_set_value(reset_gpio
, 1);
66 gpio_set_value(reset_gpio
, 0);
68 /* give it some time */
76 static void do_hw_reset(void)
78 /* Initialize the watchdog and let it fire */
81 OSMR3
= OSCR
+ 368640; /* ... in 100 ms */
84 void arch_reset(char mode
, const char *cmd
)
86 clear_reset_status(RESET_STATUS_ALL
);
90 /* Jump into ROM at address 0 */