Commit | Line | Data |
---|---|---|
75f10b46 DB |
1 | /* |
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. | |
5 | */ | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/delay.h> | |
9 | #include <linux/gpio.h> | |
fced80c7 | 10 | #include <linux/io.h> |
75f10b46 | 11 | #include <asm/proc-fns.h> |
9f97da78 | 12 | #include <asm/system_misc.h> |
75f10b46 | 13 | |
5bf3df3f | 14 | #include <mach/regs-ost.h> |
afd2fc02 | 15 | #include <mach/reset.h> |
75f10b46 | 16 | |
04fef228 EM |
17 | unsigned int reset_status; |
18 | EXPORT_SYMBOL(reset_status); | |
75f10b46 DB |
19 | |
20 | static void do_hw_reset(void); | |
21 | ||
22 | static int reset_gpio = -1; | |
23 | ||
216e3b7a | 24 | int init_gpio_reset(int gpio, int output, int level) |
75f10b46 DB |
25 | { |
26 | int rc; | |
27 | ||
28 | rc = gpio_request(gpio, "reset generator"); | |
29 | if (rc) { | |
30 | printk(KERN_ERR "Can't request reset_gpio\n"); | |
31 | goto out; | |
32 | } | |
33 | ||
69fc7eed | 34 | if (output) |
216e3b7a | 35 | rc = gpio_direction_output(gpio, level); |
69fc7eed DB |
36 | else |
37 | rc = gpio_direction_input(gpio); | |
75f10b46 | 38 | if (rc) { |
69fc7eed | 39 | printk(KERN_ERR "Can't configure reset_gpio\n"); |
75f10b46 DB |
40 | gpio_free(gpio); |
41 | goto out; | |
42 | } | |
43 | ||
44 | out: | |
45 | if (!rc) | |
46 | reset_gpio = gpio; | |
47 | ||
48 | return rc; | |
49 | } | |
50 | ||
51 | /* | |
52 | * Trigger GPIO reset. | |
53 | * This covers various types of logic connecting gpio pin | |
54 | * to RESET pins (nRESET or GPIO_RESET): | |
55 | */ | |
56 | static void do_gpio_reset(void) | |
57 | { | |
58 | BUG_ON(reset_gpio == -1); | |
59 | ||
60 | /* drive it low */ | |
61 | gpio_direction_output(reset_gpio, 0); | |
62 | mdelay(2); | |
63 | /* rising edge or drive high */ | |
64 | gpio_set_value(reset_gpio, 1); | |
65 | mdelay(2); | |
66 | /* falling edge */ | |
67 | gpio_set_value(reset_gpio, 0); | |
68 | ||
69 | /* give it some time */ | |
70 | mdelay(10); | |
71 | ||
72 | WARN_ON(1); | |
73 | /* fallback */ | |
74 | do_hw_reset(); | |
75 | } | |
76 | ||
77 | static void do_hw_reset(void) | |
78 | { | |
79 | /* Initialize the watchdog and let it fire */ | |
3169663a RK |
80 | writel_relaxed(OWER_WME, OWER); |
81 | writel_relaxed(OSSR_M3, OSSR); | |
82 | /* ... in 100 ms */ | |
83 | writel_relaxed(readl_relaxed(OSCR) + 368640, OSMR3); | |
75f10b46 DB |
84 | } |
85 | ||
7b6d864b | 86 | void pxa_restart(enum reboot_mode mode, const char *cmd) |
75f10b46 | 87 | { |
271a74fc RK |
88 | local_irq_disable(); |
89 | local_fiq_disable(); | |
90 | ||
04fef228 | 91 | clear_reset_status(RESET_STATUS_ALL); |
75f10b46 DB |
92 | |
93 | switch (mode) { | |
7b6d864b | 94 | case REBOOT_SOFT: |
75f10b46 | 95 | /* Jump into ROM at address 0 */ |
e879c862 | 96 | soft_restart(0); |
75f10b46 | 97 | break; |
7b6d864b | 98 | case REBOOT_GPIO: |
75f10b46 DB |
99 | do_gpio_reset(); |
100 | break; | |
7b6d864b | 101 | case REBOOT_HARD: |
28105fda JK |
102 | default: |
103 | do_hw_reset(); | |
104 | break; | |
75f10b46 DB |
105 | } |
106 | } | |
107 |