1 files changed, 120 insertions, 0 deletions
diff --git a/arch/blackfin/cpu/cmd_gpio.c b/arch/blackfin/cpu/cmd_gpio.c
new file mode 100644
index 0000000..9e505b6
--- /dev/null
+++ b/arch/blackfin/cpu/cmd_gpio.c
@@ -0,0 +1,120 @@
+/*
+ * Control GPIO pins on the fly
+ *
+ * Copyright (c) 2008-2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <command.h>
+
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+
+enum {
+	GPIO_INPUT,
+	GPIO_SET,
+	GPIO_CLEAR,
+	GPIO_TOGGLE,
+};
+
+int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	if (argc == 2 && !strcmp(argv[1], "status")) {
+		bfin_gpio_labels();
+		return 0;
+	}
+
+	if (argc != 3) {
+ show_usage:
+		printf("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+
+	/* parse the behavior */
+	ulong sub_cmd;
+	switch (argv[1][0]) {
+		case 'i': sub_cmd = GPIO_INPUT;  break;
+		case 's': sub_cmd = GPIO_SET;    break;
+		case 'c': sub_cmd = GPIO_CLEAR;  break;
+		case 't': sub_cmd = GPIO_TOGGLE; break;
+		default:  goto show_usage;
+	}
+
+	/* parse the pin with format: [p][port]<#> */
+	const char *str_pin = argv[2];
+
+	/* grab the [p]<port> portion */
+	ulong port_base;
+	if (*str_pin == 'p') ++str_pin;
+	switch (*str_pin) {
+#ifdef GPIO_PA0
+		case 'a': port_base = GPIO_PA0; break;
+#endif
+#ifdef GPIO_PB0
+		case 'b': port_base = GPIO_PB0; break;
+#endif
+#ifdef GPIO_PC0
+		case 'c': port_base = GPIO_PC0; break;
+#endif
+#ifdef GPIO_PD0
+		case 'd': port_base = GPIO_PD0; break;
+#endif
+#ifdef GPIO_PE0
+		case 'e': port_base = GPIO_PE0; break;
+#endif
+#ifdef GPIO_PF0
+		case 'f': port_base = GPIO_PF0; break;
+#endif
+#ifdef GPIO_PG0
+		case 'g': port_base = GPIO_PG0; break;
+#endif
+#ifdef GPIO_PH0
+		case 'h': port_base = GPIO_PH0; break;
+#endif
+#ifdef GPIO_PI0
+		case 'i': port_base = GPIO_PI0; break;
+#endif
+#ifdef GPIO_PJ
+		case 'j': port_base = GPIO_PJ0; break;
+#endif
+		default:  goto show_usage;
+	}
+
+	/* grab the <#> portion */
+	ulong pin = simple_strtoul(str_pin + 1, NULL, 10);
+	if (pin > 15)
+		goto show_usage;
+
+	/* grab the pin before we tweak it */
+	ulong gpio = port_base + pin;
+	gpio_request(gpio, "cmd_gpio");
+
+	/* finally, let's do it: set direction and exec command */
+	if (sub_cmd == GPIO_INPUT) {
+		gpio_direction_input(gpio);
+		printf("gpio: pin %lu on port %c set to input\n", pin, *str_pin);
+		return 0;
+	}
+
+	ulong value;
+	switch (sub_cmd) {
+		case GPIO_SET:    value = 1; break;
+		case GPIO_CLEAR:  value = 0; break;
+		case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
+		default:          goto show_usage;
+	}
+	gpio_direction_output(gpio, value);
+	printf("gpio: pin %lu on port %c (gpio %lu) value is %lu\n",
+		pin, *str_pin, gpio, value);
+
+	gpio_free(gpio);
+
+	return 0;
+}
+
+U_BOOT_CMD(gpio, 3, 0, do_gpio,
+	"set/clear/toggle gpio output pins",
+	"<set|clear|toggle> <port><pin>\n"
+	"    - set/clear/toggle the specified pin (e.g. PF10)");