1 files changed, 74 insertions, 0 deletions
diff --git a/board/cm-bf527/gpio.c b/board/cm-bf527/gpio.c
new file mode 100644
index 0000000..dcf641b
--- /dev/null
+++ b/board/cm-bf527/gpio.c
@@ -0,0 +1,74 @@
+/*
+ * Control GPIO pins on the fly
+ *
+ * Copyright (c) 2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <command.h>
+
+#include <asm/blackfin.h>
+
+int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	if (argc != 3) {
+ show_usage:
+		printf("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	/* parse the behavior */
+	ulong port_cmd = 0;
+	switch (argv[1][0]) {
+		case 'i': break;
+		case 's': port_cmd = (PORTFIO_SET - PORTFIO); break;
+		case 'c': port_cmd = (PORTFIO_CLEAR - PORTFIO); break;
+		case 't': port_cmd = (PORTFIO_TOGGLE - PORTFIO); break;
+		default:  goto show_usage;
+	}
+
+	/* parse the pin with format: [p]<fgh><#> */
+	const char *str_pin = argv[2];
+
+	/* grab the [p]<fgh> portion */
+	ulong port_base;
+	if (*str_pin == 'p') ++str_pin;
+	switch (*str_pin) {
+		case 'f': port_base = PORTFIO; break;
+		case 'g': port_base = PORTGIO; break;
+		case 'h': port_base = PORTHIO; break;
+		default:  goto show_usage;
+	}
+
+	/* grab the <#> portion */
+	ulong pin = simple_strtoul(str_pin+1, NULL, 10);
+	ulong pin_mask = (1 << pin);
+	if (pin > 15)
+		goto show_usage;
+
+	/* finally, let's do it: set direction and exec command */
+	switch (*str_pin) {
+		case 'f': bfin_write_PORTF_FER(bfin_read_PORTF_FER() & ~pin_mask); break;
+		case 'g': bfin_write_PORTG_FER(bfin_read_PORTG_FER() & ~pin_mask); break;
+		case 'h': bfin_write_PORTH_FER(bfin_read_PORTH_FER() & ~pin_mask); break;
+	}
+
+	ulong port_dir = port_base + (PORTFIO_DIR - PORTFIO);
+	if (argv[1][0] == 'i')
+		bfin_write16(port_dir, bfin_read16(port_dir) & ~pin_mask);
+	else {
+		bfin_write16(port_dir, bfin_read16(port_dir) | pin_mask);
+		bfin_write16(port_base + port_cmd, pin_mask);
+	}
+
+	printf("gpio: pin %li on port %c has been %c\n", pin, *str_pin, argv[1][0]);
+
+	return 0;
+}
+
+U_BOOT_CMD(gpio, 3, 0, do_gpio,
+	"gpio    - set/clear/toggle gpio output pins\n",
+	"<s|c|t> <port><pin>\n"
+	"    - set/clear/toggle the specified pin\n");