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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#include <asm/system_misc.h>
13
14#include <mach/regs-ost.h>
15#include <mach/reset.h>
16#include <mach/smemc.h>
17
18unsigned int reset_status;
19EXPORT_SYMBOL(reset_status);
20
21static void do_hw_reset(void);
22
23static int reset_gpio = -1;
24
25int init_gpio_reset(int gpio, int output, int level)
26{
27 int rc;
28
29 rc = gpio_request(gpio, "reset generator");
30 if (rc) {
31 printk(KERN_ERR "Can't request reset_gpio\n");
32 goto out;
33 }
34
35 if (output)
36 rc = gpio_direction_output(gpio, level);
37 else
38 rc = gpio_direction_input(gpio);
39 if (rc) {
40 printk(KERN_ERR "Can't configure reset_gpio\n");
41 gpio_free(gpio);
42 goto out;
43 }
44
45out:
46 if (!rc)
47 reset_gpio = gpio;
48
49 return rc;
50}
51
52/*
53 * Trigger GPIO reset.
54 * This covers various types of logic connecting gpio pin
55 * to RESET pins (nRESET or GPIO_RESET):
56 */
57static void do_gpio_reset(void)
58{
59 BUG_ON(reset_gpio == -1);
60
61 /* drive it low */
62 gpio_direction_output(reset_gpio, 0);
63 mdelay(2);
64 /* rising edge or drive high */
65 gpio_set_value(reset_gpio, 1);
66 mdelay(2);
67 /* falling edge */
68 gpio_set_value(reset_gpio, 0);
69
70 /* give it some time */
71 mdelay(10);
72
73 WARN_ON(1);
74 /* fallback */
75 do_hw_reset();
76}
77
78static void do_hw_reset(void)
79{
80 /* Initialize the watchdog and let it fire */
81 writel_relaxed(OWER_WME, OWER);
82 writel_relaxed(OSSR_M3, OSSR);
83 /* ... in 100 ms */
84 writel_relaxed(readl_relaxed(OSCR) + 368640, OSMR3);
85 /*
86 * SDRAM hangs on watchdog reset on Marvell PXA270 (erratum 71)
87 * we put SDRAM into self-refresh to prevent that
88 */
89 while (1)
90 writel_relaxed(MDREFR_SLFRSH, MDREFR);
91}
92
93void pxa_restart(enum reboot_mode mode, const char *cmd)
94{
95 local_irq_disable();
96 local_fiq_disable();
97
98 clear_reset_status(RESET_STATUS_ALL);
99
100 switch (mode) {
101 case REBOOT_SOFT:
102 /* Jump into ROM at address 0 */
103 soft_restart(0);
104 break;
105 case REBOOT_GPIO:
106 do_gpio_reset();
107 break;
108 case REBOOT_HARD:
109 default:
110 do_hw_reset();
111 break;
112 }
113}
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#include <asm/system_misc.h>
13
14#include <mach/regs-ost.h>
15#include <mach/reset.h>
16
17unsigned int reset_status;
18EXPORT_SYMBOL(reset_status);
19
20static void do_hw_reset(void);
21
22static int reset_gpio = -1;
23
24int init_gpio_reset(int gpio, int output, int level)
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
34 if (output)
35 rc = gpio_direction_output(gpio, level);
36 else
37 rc = gpio_direction_input(gpio);
38 if (rc) {
39 printk(KERN_ERR "Can't configure reset_gpio\n");
40 gpio_free(gpio);
41 goto out;
42 }
43
44out:
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 */
56static 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
77static void do_hw_reset(void)
78{
79 /* Initialize the watchdog and let it fire */
80 OWER = OWER_WME;
81 OSSR = OSSR_M3;
82 OSMR3 = OSCR + 368640; /* ... in 100 ms */
83}
84
85void pxa_restart(char mode, const char *cmd)
86{
87 local_irq_disable();
88 local_fiq_disable();
89
90 clear_reset_status(RESET_STATUS_ALL);
91
92 switch (mode) {
93 case 's':
94 /* Jump into ROM at address 0 */
95 soft_restart(0);
96 break;
97 case 'g':
98 do_gpio_reset();
99 break;
100 case 'h':
101 default:
102 do_hw_reset();
103 break;
104 }
105}
106