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Aubrey Li26bf7de2007-03-19 01:24:52 +08001/*
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