[Blackfin][PATCH] Add BF537 stamp board support

1 files changed, 201 insertions, 0 deletions

diff --git a/board/bf537-stamp/cmd_bf537led.c b/board/bf537-stamp/cmd_bf537led.c
new file mode 100644
index 0000000..fa650f2
--- /dev/null
+++ b/board/bf537-stamp/cmd_bf537led.c
@@ -0,0 +1,201 @@
+/*
+ * 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