Root/
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> |
10 | #include <linux/io.h> |
11 | #include <asm/proc-fns.h> |
12 | |
13 | #include <mach/regs-ost.h> |
14 | #include <mach/reset.h> |
15 | |
16 | unsigned int reset_status; |
17 | EXPORT_SYMBOL(reset_status); |
18 | |
19 | static void do_hw_reset(void); |
20 | |
21 | static int reset_gpio = -1; |
22 | |
23 | int init_gpio_reset(int gpio, int output, int level) |
24 | { |
25 | int rc; |
26 | |
27 | rc = gpio_request(gpio, "reset generator"); |
28 | if (rc) { |
29 | printk(KERN_ERR "Can't request reset_gpio\n"); |
30 | goto out; |
31 | } |
32 | |
33 | if (output) |
34 | rc = gpio_direction_output(gpio, level); |
35 | else |
36 | rc = gpio_direction_input(gpio); |
37 | if (rc) { |
38 | printk(KERN_ERR "Can't configure reset_gpio\n"); |
39 | gpio_free(gpio); |
40 | goto out; |
41 | } |
42 | |
43 | out: |
44 | if (!rc) |
45 | reset_gpio = gpio; |
46 | |
47 | return rc; |
48 | } |
49 | |
50 | /* |
51 | * Trigger GPIO reset. |
52 | * This covers various types of logic connecting gpio pin |
53 | * to RESET pins (nRESET or GPIO_RESET): |
54 | */ |
55 | static void do_gpio_reset(void) |
56 | { |
57 | BUG_ON(reset_gpio == -1); |
58 | |
59 | /* drive it low */ |
60 | gpio_direction_output(reset_gpio, 0); |
61 | mdelay(2); |
62 | /* rising edge or drive high */ |
63 | gpio_set_value(reset_gpio, 1); |
64 | mdelay(2); |
65 | /* falling edge */ |
66 | gpio_set_value(reset_gpio, 0); |
67 | |
68 | /* give it some time */ |
69 | mdelay(10); |
70 | |
71 | WARN_ON(1); |
72 | /* fallback */ |
73 | do_hw_reset(); |
74 | } |
75 | |
76 | static void do_hw_reset(void) |
77 | { |
78 | /* Initialize the watchdog and let it fire */ |
79 | OWER = OWER_WME; |
80 | OSSR = OSSR_M3; |
81 | OSMR3 = OSCR + 368640; /* ... in 100 ms */ |
82 | } |
83 | |
84 | void arch_reset(char mode, const char *cmd) |
85 | { |
86 | clear_reset_status(RESET_STATUS_ALL); |
87 | |
88 | switch (mode) { |
89 | case 's': |
90 | /* Jump into ROM at address 0 */ |
91 | cpu_reset(0); |
92 | break; |
93 | case 'g': |
94 | do_gpio_reset(); |
95 | break; |
96 | case 'h': |
97 | default: |
98 | do_hw_reset(); |
99 | break; |
100 | } |
101 | } |
102 | |
103 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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