xref: /openbmc/u-boot/drivers/misc/status_led.c (revision 1e52fea3)
1 /*
2  * (C) Copyright 2000-2003
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23 
24 #include <common.h>
25 #include <status_led.h>
26 
27 /*
28  * The purpose of this code is to signal the operational status of a
29  * target which usually boots over the network; while running in
30  * U-Boot, a status LED is blinking. As soon as a valid BOOTP reply
31  * message has been received, the LED is turned off. The Linux
32  * kernel, once it is running, will start blinking the LED again,
33  * with another frequency.
34  */
35 
36 /* ------------------------------------------------------------------------- */
37 
38 typedef struct {
39 	led_id_t mask;
40 	int state;
41 	int period;
42 	int cnt;
43 } led_dev_t;
44 
45 led_dev_t led_dev[] = {
46     {	STATUS_LED_BIT,
47 	STATUS_LED_STATE,
48 	STATUS_LED_PERIOD,
49 	0,
50     },
51 #if defined(STATUS_LED_BIT1)
52     {	STATUS_LED_BIT1,
53 	STATUS_LED_STATE1,
54 	STATUS_LED_PERIOD1,
55 	0,
56     },
57 #endif
58 #if defined(STATUS_LED_BIT2)
59     {	STATUS_LED_BIT2,
60 	STATUS_LED_STATE2,
61 	STATUS_LED_PERIOD2,
62 	0,
63     },
64 #endif
65 #if defined(STATUS_LED_BIT3)
66     {	STATUS_LED_BIT3,
67 	STATUS_LED_STATE3,
68 	STATUS_LED_PERIOD3,
69 	0,
70     },
71 #endif
72 };
73 
74 #define MAX_LED_DEV	(sizeof(led_dev)/sizeof(led_dev_t))
75 
76 static int status_led_init_done = 0;
77 
78 static void status_led_init (void)
79 {
80 	led_dev_t *ld;
81 	int i;
82 
83 	for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++)
84 		__led_init (ld->mask, ld->state);
85 	status_led_init_done = 1;
86 }
87 
88 void status_led_tick (ulong timestamp)
89 {
90 	led_dev_t *ld;
91 	int i;
92 
93 	if (!status_led_init_done)
94 		status_led_init ();
95 
96 	for (i = 0, ld = led_dev; i < MAX_LED_DEV; i++, ld++) {
97 
98 		if (ld->state != STATUS_LED_BLINKING)
99 			continue;
100 
101 		if (++ld->cnt >= ld->period) {
102 			__led_toggle (ld->mask);
103 			ld->cnt -= ld->period;
104 		}
105 
106 	}
107 }
108 
109 void status_led_set (int led, int state)
110 {
111 	led_dev_t *ld;
112 
113 	if (led < 0 || led >= MAX_LED_DEV)
114 		return;
115 
116 	if (!status_led_init_done)
117 		status_led_init ();
118 
119 	ld = &led_dev[led];
120 
121 	ld->state = state;
122 	if (state == STATUS_LED_BLINKING) {
123 		ld->cnt = 0;		/* always start with full period    */
124 		state = STATUS_LED_ON;	/* always start with LED _ON_       */
125 	}
126 	__led_set (ld->mask, state);
127 }
128