source: SVN/rincon/u-boot/board/bf537-stamp/cmd_bf537led.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 2 years ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 5.2 KB
Line 
1/*
2 * U-boot - cmd_bf537led.c
3 *
4 * Copyright (C) 2006 Aaron Gage, Ocean Optics Inc.
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24#include <common.h>
25#include <config.h>
26#include <command.h>
27#include <asm/blackfin.h>
28#include <asm-blackfin/string.h>
29#ifdef CONFIG_BF537_STAMP_LEDCMD
30
31/* Define the command usage in a reusable way */
32#define USAGE_LONG \
33        "led <number> <action>\n" \
34        "    <number>  - Index (0-5) of LED to change, or \"all\"\n" \
35        "    <action>  - Must be one of:\n" \
36        "               on off toggle\n"
37
38/* Number of LEDs supported by the board */
39#define NUMBER_LEDS     6
40/* The BF537 stamp has 6 LEDs.  This mask indicates that all should be lit. */
41#define LED_ALL_MASK    0x003F
42
43void show_cmd_usage(void);
44void set_led_state(int index, int state);
45void configure_GPIO_to_output(int index);
46
47/* Map of LEDs according to their GPIO ports.  This can be rearranged or
48 * otherwise changed to account for different GPIO configurations.
49 */
50int led_ports[] = { PF6, PF7, PF8, PF9, PF10, PF11 };
51
52#define ACTION_TOGGLE   -1
53#define ACTION_OFF      0
54#define ACTION_ON       1
55
56#define LED_STATE_OFF   0
57#define LED_STATE_ON    1
58
59/* This is a trivial atoi implementation since we don't have one available */
60int atoi(char *string)
61{
62        int length;
63        int retval = 0;
64        int i;
65        int sign = 1;
66
67        length = strlen(string);
68        for (i = 0; i < length; i++) {
69                if (0 == i && string[0] == '-') {
70                        sign = -1;
71                        continue;
72                }
73                if (string[i] > '9' || string[i] < '0') {
74                        break;
75                }
76                retval *= 10;
77                retval += string[i] - '0';
78        }
79        retval *= sign;
80        return retval;
81}
82
83int do_bf537led(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
84{
85        int led_mask = 0;
86        int led_current_state = 0;
87        int action = ACTION_OFF;
88        int temp;
89
90        if (3 != argc) {
91                /* Not enough arguments, so just show usage information */
92                show_cmd_usage();
93                return 1;
94        }
95
96        if (strcmp(argv[1], "all") == 0) {
97                led_mask = LED_ALL_MASK;
98        } else {
99                temp = atoi(argv[1]);
100                if (temp < 0 || temp >= NUMBER_LEDS) {
101                        printf("Invalid LED number [%s]\n", argv[1]);
102                        show_cmd_usage();
103                        return 2;
104                }
105                led_mask |= (1 << temp);
106        }
107
108        if (strcmp(argv[2], "off") == 0) {
109                action = ACTION_OFF;
110        } else if (strcmp(argv[2], "on") == 0) {
111                action = ACTION_ON;
112        } else if (strcmp(argv[2], "toggle") == 0) {
113                action = ACTION_TOGGLE;
114        } else {
115                printf("Invalid action [%s]\n", argv[2]);
116                show_cmd_usage();
117                return 3;
118        }
119
120        for (temp = 0; temp < NUMBER_LEDS; temp++) {
121                if ((led_mask & (1 << temp)) > 0) {
122                        /*
123                         * It is possible that the user has wired one of PF6-PF11 to
124                         * something other than an LED, so this will only change a pin
125                         * to output if the user has indicated a state change.  This may
126                         * happen a lot, but this way is safer than just setting all pins
127                         * to output.
128                         */
129                        configure_GPIO_to_output(temp);
130
131                        led_current_state =
132                            ((*pPORTFIO & led_ports[temp]) >
133                             0) ? LED_STATE_ON : LED_STATE_OFF;
134        /*
135                printf("LED state for index %d (%x) is %d\n", temp, led_ports[temp],
136                        led_current_state);
137                printf("*pPORTFIO is %x\n", *pPORTFIO);
138        */
139                        if (ACTION_ON == action
140                            || (ACTION_TOGGLE == action
141                                && 0 == led_current_state)) {
142                                printf("Turning LED %d on\n", temp);
143                                set_led_state(temp, LED_STATE_ON);
144                        } else {
145                                printf("Turning LED %d off\n", temp);
146                                set_led_state(temp, LED_STATE_OFF);
147                        }
148                }
149        }
150
151        return 0;
152}
153
154/*
155 * The GPIO pins that go to the LEDs on the BF537 stamp must be configured
156 * as output.  This function simply configures them that way.  This could
157 * be done to all of the GPIO lines at once, but if a user is using a
158 * custom board, this will try to be nice and only change the GPIO lines
159 * that the user specifically names.
160 */
161void configure_GPIO_to_output(int index)
162{
163        int port;
164
165        port = led_ports[index];
166
167        /* Clear the Port F Function Enable Register */
168        *pPORTF_FER &= ~port;
169        /* Set the Port F I/O direction register */
170        *pPORTFIO_DIR |= port;
171        /* Clear the Port F I/O Input Enable Register */
172        *pPORTFIO_INEN &= ~port;
173}
174
175/* Enforce the given state on the GPIO line for the indicated LED */
176void set_led_state(int index, int state)
177{
178        int port;
179
180        port = led_ports[index];
181
182        if (LED_STATE_OFF == state) {
183                /* Clear the bit to turn off the LED */
184                *pPORTFIO &= ~port;
185        } else {
186                /* Set the bit to turn on the LED */
187                *pPORTFIO |= port;
188        }
189}
190
191/* Display usage information */
192void show_cmd_usage()
193{
194        printf("Usage:\n%s", USAGE_LONG);
195}
196
197/* Register information for u-boot to find this command */
198U_BOOT_CMD(led, 3, 1, do_bf537led,
199           "led- Control BF537 stamp LEDs\n", USAGE_LONG);
200
201#endif
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