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Diffstat (limited to 'board/bf537-stamp/cmd_bf537led.c')
-rw-r--r--board/bf537-stamp/cmd_bf537led.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/board/bf537-stamp/cmd_bf537led.c b/board/bf537-stamp/cmd_bf537led.c
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+++ b/board/bf537-stamp/cmd_bf537led.c
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+/*
+ * U-boot - cmd_bf537led.c
+ *
+ * Copyright (C) 2006 Aaron Gage, Ocean Optics Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <config.h>
+#include <command.h>
+#include <asm/blackfin.h>
+#include <asm-blackfin/string.h>
+#ifdef CONFIG_BF537_STAMP_LEDCMD
+
+/* Define the command usage in a reusable way */
+#define USAGE_LONG \
+ "led <number> <action>\n" \
+ " <number> - Index (0-5) of LED to change, or \"all\"\n" \
+ " <action> - Must be one of:\n" \
+ " on off toggle\n"
+
+/* Number of LEDs supported by the board */
+#define NUMBER_LEDS 6
+/* The BF537 stamp has 6 LEDs. This mask indicates that all should be lit. */
+#define LED_ALL_MASK 0x003F
+
+void show_cmd_usage(void);
+void set_led_state(int index, int state);
+void configure_GPIO_to_output(int index);
+
+/* Map of LEDs according to their GPIO ports. This can be rearranged or
+ * otherwise changed to account for different GPIO configurations.
+ */
+int led_ports[] = { PF6, PF7, PF8, PF9, PF10, PF11 };
+
+#define ACTION_TOGGLE -1
+#define ACTION_OFF 0
+#define ACTION_ON 1
+
+#define LED_STATE_OFF 0
+#define LED_STATE_ON 1
+
+/* This is a trivial atoi implementation since we don't have one available */
+int atoi(char *string)
+{
+ int length;
+ int retval = 0;
+ int i;
+ int sign = 1;
+
+ length = strlen(string);
+ for (i = 0; i < length; i++) {
+ if (0 == i && string[0] == '-') {
+ sign = -1;
+ continue;
+ }
+ if (string[i] > '9' || string[i] < '0') {
+ break;
+ }
+ retval *= 10;
+ retval += string[i] - '0';
+ }
+ retval *= sign;
+ return retval;
+}
+
+int do_bf537led(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+{
+ int led_mask = 0;
+ int led_current_state = 0;
+ int action = ACTION_OFF;
+ int temp;
+
+ if (3 != argc) {
+ /* Not enough arguments, so just show usage information */
+ show_cmd_usage();
+ return 1;
+ }
+
+ if (strcmp(argv[1], "all") == 0) {
+ led_mask = LED_ALL_MASK;
+ } else {
+ temp = atoi(argv[1]);
+ if (temp < 0 || temp >= NUMBER_LEDS) {
+ printf("Invalid LED number [%s]\n", argv[1]);
+ show_cmd_usage();
+ return 2;
+ }
+ led_mask |= (1 << temp);
+ }
+
+ if (strcmp(argv[2], "off") == 0) {
+ action = ACTION_OFF;
+ } else if (strcmp(argv[2], "on") == 0) {
+ action = ACTION_ON;
+ } else if (strcmp(argv[2], "toggle") == 0) {
+ action = ACTION_TOGGLE;
+ } else {
+ printf("Invalid action [%s]\n", argv[2]);
+ show_cmd_usage();
+ return 3;
+ }
+
+ for (temp = 0; temp < NUMBER_LEDS; temp++) {
+ if ((led_mask & (1 << temp)) > 0) {
+ /*
+ * It is possible that the user has wired one of PF6-PF11 to
+ * something other than an LED, so this will only change a pin
+ * to output if the user has indicated a state change. This may
+ * happen a lot, but this way is safer than just setting all pins
+ * to output.
+ */
+ configure_GPIO_to_output(temp);
+
+ led_current_state =
+ ((*pPORTFIO & led_ports[temp]) >
+ 0) ? LED_STATE_ON : LED_STATE_OFF;
+ /*
+ printf("LED state for index %d (%x) is %d\n", temp, led_ports[temp],
+ led_current_state);
+ printf("*pPORTFIO is %x\n", *pPORTFIO);
+ */
+ if (ACTION_ON == action
+ || (ACTION_TOGGLE == action
+ && 0 == led_current_state)) {
+ printf("Turning LED %d on\n", temp);
+ set_led_state(temp, LED_STATE_ON);
+ } else {
+ printf("Turning LED %d off\n", temp);
+ set_led_state(temp, LED_STATE_OFF);
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * The GPIO pins that go to the LEDs on the BF537 stamp must be configured
+ * as output. This function simply configures them that way. This could
+ * be done to all of the GPIO lines at once, but if a user is using a
+ * custom board, this will try to be nice and only change the GPIO lines
+ * that the user specifically names.
+ */
+void configure_GPIO_to_output(int index)
+{
+ int port;
+
+ port = led_ports[index];
+
+ /* Clear the Port F Function Enable Register */
+ *pPORTF_FER &= ~port;
+ /* Set the Port F I/O direction register */
+ *pPORTFIO_DIR |= port;
+ /* Clear the Port F I/O Input Enable Register */
+ *pPORTFIO_INEN &= ~port;
+}
+
+/* Enforce the given state on the GPIO line for the indicated LED */
+void set_led_state(int index, int state)
+{
+ int port;
+
+ port = led_ports[index];
+
+ if (LED_STATE_OFF == state) {
+ /* Clear the bit to turn off the LED */
+ *pPORTFIO &= ~port;
+ } else {
+ /* Set the bit to turn on the LED */
+ *pPORTFIO |= port;
+ }
+}
+
+/* Display usage information */
+void show_cmd_usage()
+{
+ printf("Usage:\n%s", USAGE_LONG);
+}
+
+/* Register information for u-boot to find this command */
+U_BOOT_CMD(led, 3, 1, do_bf537led,
+ "led- Control BF537 stamp LEDs\n", USAGE_LONG);
+
+#endif