xref: /openbmc/u-boot/arch/arm/cpu/arm920t/ep93xx/led.c (revision 5794619e)
1 /*
2  * Copyright (C) 2010, 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
3  *
4  * See file CREDITS for list of people who contributed to this
5  * project.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2 of
10  * the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20  * MA 02111-1307 USA
21  */
22 
23 #include <asm/io.h>
24 #include <asm/arch/ep93xx.h>
25 #include <config.h>
26 #include <status_led.h>
27 
28 static uint8_t saved_state[2] = {STATUS_LED_OFF, STATUS_LED_OFF};
29 static uint32_t gpio_pin[2] = {1 << STATUS_LED_GREEN,
30 			       1 << STATUS_LED_RED};
31 
32 inline void switch_LED_on(uint8_t led)
33 {
34 	register struct gpio_regs *gpio = (struct gpio_regs *)GPIO_BASE;
35 
36 	writel(readl(&gpio->pedr) | gpio_pin[led], &gpio->pedr);
37 	saved_state[led] = STATUS_LED_ON;
38 }
39 
40 inline void switch_LED_off(uint8_t led)
41 {
42 	register struct gpio_regs *gpio = (struct gpio_regs *)GPIO_BASE;
43 
44 	writel(readl(&gpio->pedr) & ~gpio_pin[led], &gpio->pedr);
45 	saved_state[led] = STATUS_LED_OFF;
46 }
47 
48 void red_LED_on(void)
49 {
50 	switch_LED_on(STATUS_LED_RED);
51 }
52 
53 void red_LED_off(void)
54 {
55 	switch_LED_off(STATUS_LED_RED);
56 }
57 
58 void green_LED_on(void)
59 {
60 	switch_LED_on(STATUS_LED_GREEN);
61 }
62 
63 void green_LED_off(void)
64 {
65 	switch_LED_off(STATUS_LED_GREEN);
66 }
67 
68 void __led_init(led_id_t mask, int state)
69 {
70 	__led_set(mask, state);
71 }
72 
73 void __led_toggle(led_id_t mask)
74 {
75 	if (STATUS_LED_RED == mask) {
76 		if (STATUS_LED_ON == saved_state[STATUS_LED_RED])
77 			red_LED_off();
78 		else
79 			red_LED_on();
80 	} else if (STATUS_LED_GREEN == mask) {
81 		if (STATUS_LED_ON == saved_state[STATUS_LED_GREEN])
82 			green_LED_off();
83 		else
84 			green_LED_on();
85 	}
86 }
87 
88 void __led_set(led_id_t mask, int state)
89 {
90 	if (STATUS_LED_RED == mask) {
91 		if (STATUS_LED_ON == state)
92 			red_LED_on();
93 		else
94 			red_LED_off();
95 	} else if (STATUS_LED_GREEN == mask) {
96 		if (STATUS_LED_ON == state)
97 			green_LED_on();
98 		else
99 			green_LED_off();
100 	}
101 }
102