diff options
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/cpu/Makefile | 1 | ||||
| -rw-r--r-- | arch/blackfin/cpu/cmd_gpio.c | 120 |
2 files changed, 121 insertions, 0 deletions
diff --git a/arch/blackfin/cpu/Makefile b/arch/blackfin/cpu/Makefile index 91797c798f..b7f991dea0 100644 --- a/arch/blackfin/cpu/Makefile +++ b/arch/blackfin/cpu/Makefile @@ -18,6 +18,7 @@ CEXTRA := initcode.o SEXTRA := start.o SOBJS := interrupt.o cache.o COBJS-$(CONFIG_BOOTCOUNT_LIMIT) += bootcount.o +COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o COBJS-y += cpu.o COBJS-y += gpio.o COBJS-y += interrupts.o diff --git a/arch/blackfin/cpu/cmd_gpio.c b/arch/blackfin/cpu/cmd_gpio.c new file mode 100644 index 0000000000..9e505b6617 --- /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)"); |
