diff options
Diffstat (limited to 'qemu/roms/u-boot/common/cmd_gpio.c')
| -rw-r--r-- | qemu/roms/u-boot/common/cmd_gpio.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/common/cmd_gpio.c b/qemu/roms/u-boot/common/cmd_gpio.c new file mode 100644 index 000000000..aff044518 --- /dev/null +++ b/qemu/roms/u-boot/common/cmd_gpio.c @@ -0,0 +1,193 @@ +/* + * Control GPIO pins on the fly + * + * Copyright (c) 2008-2011 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <common.h> +#include <command.h> +#include <dm.h> +#include <asm/gpio.h> + +int __weak name_to_gpio(const char *name) +{ + return simple_strtoul(name, NULL, 10); +} + +enum gpio_cmd { + GPIO_INPUT, + GPIO_SET, + GPIO_CLEAR, + GPIO_TOGGLE, +}; + +#if defined(CONFIG_DM_GPIO) && !defined(gpio_status) +static const char * const gpio_function[] = { + "input", + "output", + "unknown", +}; + +static void show_gpio(struct device *dev, const char *bank_name, int offset) +{ + struct dm_gpio_ops *ops = gpio_get_ops(dev); + char buf[80]; + int ret; + + *buf = '\0'; + if (ops->get_state) { + ret = ops->get_state(dev, offset, buf, sizeof(buf)); + if (ret) { + puts("<unknown>"); + return; + } + } else { + int func = GPIOF_UNKNOWN; + int ret; + + if (ops->get_function) { + ret = ops->get_function(dev, offset); + if (ret >= 0 && ret < ARRAY_SIZE(gpio_function)) + func = ret; + } + sprintf(buf, "%s%u: %8s %d", bank_name, offset, + gpio_function[func], ops->get_value(dev, offset)); + } + + puts(buf); + puts("\n"); +} + +static int do_gpio_status(const char *gpio_name) +{ + struct device *dev; + int newline = 0; + int ret; + + if (gpio_name && !*gpio_name) + gpio_name = NULL; + for (ret = uclass_first_device(UCLASS_GPIO, &dev); + dev; + ret = uclass_next_device(&dev)) { + const char *bank_name; + int num_bits; + + bank_name = gpio_get_bank_info(dev, &num_bits); + + if (!gpio_name || !bank_name || + !strncmp(gpio_name, bank_name, strlen(bank_name))) { + const char *p = NULL; + int offset; + + if (bank_name) { + if (newline) + putc('\n'); + printf("Bank %s:\n", bank_name); + } + newline = 1; + if (gpio_name && bank_name) { + p = gpio_name + strlen(bank_name); + offset = simple_strtoul(p, NULL, 10); + show_gpio(dev, bank_name, offset); + } else { + for (offset = 0; offset < num_bits; offset++) + show_gpio(dev, bank_name, offset); + } + } + } + + return ret; +} +#endif + +static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + unsigned int gpio; + enum gpio_cmd sub_cmd; + ulong value; + const char *str_cmd, *str_gpio = NULL; +#ifdef CONFIG_DM_GPIO + int ret; +#endif + + if (argc < 2) + show_usage: + return CMD_RET_USAGE; + str_cmd = argv[1]; + if (argc > 2) + str_gpio = argv[2]; + if (!strcmp(str_cmd, "status")) { + /* Support deprecated gpio_status() */ +#ifdef gpio_status + gpio_status(); + return 0; +#elif defined(CONFIG_DM_GPIO) + return cmd_process_error(cmdtp, do_gpio_status(str_gpio)); +#else + goto show_usage; +#endif + } + + if (!str_gpio) + goto show_usage; + + /* parse the behavior */ + switch (*str_cmd) { + 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; + } + +#if defined(CONFIG_DM_GPIO) + /* + * TODO(sjg@chromium.org): For now we must fit into the existing GPIO + * framework, so we look up the name here and convert it to a GPIO number. + * Once all GPIO drivers are converted to driver model, we can change the + * code here to use the GPIO uclass interface instead of the numbered + * GPIO compatibility layer. + */ + ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio); + if (ret) + return cmd_process_error(cmdtp, ret); +#else + /* turn the gpio name into a gpio number */ + gpio = name_to_gpio(str_gpio); + if (gpio < 0) + goto show_usage; +#endif + /* grab the pin before we tweak it */ + if (gpio_request(gpio, "cmd_gpio")) { + printf("gpio: requesting pin %u failed\n", gpio); + return -1; + } + + /* finally, let's do it: set direction and exec command */ + if (sub_cmd == GPIO_INPUT) { + gpio_direction_input(gpio); + value = gpio_get_value(gpio); + } else { + 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 %s (gpio %i) value is %lu\n", + str_gpio, gpio, value); + + gpio_free(gpio); + + return value; +} + +U_BOOT_CMD(gpio, 3, 0, do_gpio, + "query and control gpio pins", + "<input|set|clear|toggle> <pin>\n" + " - input/set/clear/toggle the specified pin\n" + "gpio status [<bank> | <pin>]"); |