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