1 // SPDX-License-Identifier: GPL-2.0+
3  * GPIO driver for TI DaVinci DA8xx SOCs.
13 #include <asm/gpio.h>
14 #include <dt-bindings/gpio/gpio.h>
28 #define pinmux(x)       (&davinci_syscfg_regs->pinmux[x])
313 int gpio_request(unsigned int gpio, const char *label)  in gpio_request()  argument
315 	if (gpio >= MAX_NUM_GPIOS)  in gpio_request()
316 		return -1;  in gpio_request()
318 	if (gpio_registry[gpio].is_registered)  in gpio_request()
319 		return -1;  in gpio_request()
321 	gpio_registry[gpio].is_registered = 1;  in gpio_request()
322 	strncpy(gpio_registry[gpio].name, label, GPIO_NAME_SIZE);  in gpio_request()
323 	gpio_registry[gpio].name[GPIO_NAME_SIZE - 1] = 0;  in gpio_request()
325 	davinci_configure_pin_mux(&gpio_pinmux[gpio], 1);  in gpio_request()
330 int gpio_free(unsigned int gpio)  in gpio_free()  argument
332 	if (gpio >= MAX_NUM_GPIOS)  in gpio_free()
333 		return -1;  in gpio_free()
335 	if (!gpio_registry[gpio].is_registered)  in gpio_free()
336 		return -1;  in gpio_free()
338 	gpio_registry[gpio].is_registered = 0;  in gpio_free()
339 	gpio_registry[gpio].name[0] = '\0';  in gpio_free()
345 static int _gpio_direction_output(struct davinci_gpio *bank, unsigned int gpio, int value)  in _gpio_direction_output()  argument
347 	clrbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));  in _gpio_direction_output()
348 	gpio_set_value(gpio, value);  in _gpio_direction_output()
352 static int _gpio_direction_input(struct davinci_gpio *bank, unsigned int gpio)  in _gpio_direction_input()  argument
354 	setbits_le32(&bank->dir, 1U << GPIO_BIT(gpio));  in _gpio_direction_input()
358 static int _gpio_get_value(struct davinci_gpio *bank, unsigned int gpio)  in _gpio_get_value()  argument
361 	ip = in_le32(&bank->in_data) & (1U << GPIO_BIT(gpio));  in _gpio_get_value()
365 static int _gpio_set_value(struct davinci_gpio *bank, unsigned int gpio, int value)  in _gpio_set_value()  argument
368 		bank->set_data = 1U << GPIO_BIT(gpio);  in _gpio_set_value()
370 		bank->clr_data = 1U << GPIO_BIT(gpio);  in _gpio_set_value()
375 static int _gpio_get_dir(struct davinci_gpio *bank, unsigned int gpio)  in _gpio_get_dir()  argument
377 	return in_le32(&bank->dir) & (1U << GPIO_BIT(gpio));  in _gpio_get_dir()
384 	unsigned int gpio, dir, val;  in gpio_info()  local
387 	for (gpio = 0; gpio < MAX_NUM_GPIOS; ++gpio) {  in gpio_info()
388 		bank = GPIO_BANK(gpio);  in gpio_info()
389 		dir = _gpio_get_dir(bank, gpio);  in gpio_info()
390 		val = gpio_get_value(gpio);  in gpio_info()
393 			gpio, dir ? " in" : "out", val,  in gpio_info()
394 			gpio_registry[gpio].is_registered ? 'x' : ' ',  in gpio_info()
395 			gpio_registry[gpio].name);  in gpio_info()
399 int gpio_direction_input(unsigned int gpio)  in gpio_direction_input()  argument
403 	bank = GPIO_BANK(gpio);  in gpio_direction_input()
404 	return _gpio_direction_input(bank, gpio);  in gpio_direction_input()
407 int gpio_direction_output(unsigned int gpio, int value)  in gpio_direction_output()  argument
411 	bank = GPIO_BANK(gpio);  in gpio_direction_output()
412 	return _gpio_direction_output(bank, gpio, value);  in gpio_direction_output()
415 int gpio_get_value(unsigned int gpio)  in gpio_get_value()  argument
419 	bank = GPIO_BANK(gpio);  in gpio_get_value()
420 	return _gpio_get_value(bank, gpio);  in gpio_get_value()
423 int gpio_set_value(unsigned int gpio, int value)  in gpio_set_value()  argument
427 	bank = GPIO_BANK(gpio);  in gpio_set_value()
428 	return _gpio_set_value(bank, gpio, value);  in gpio_set_value()
444 	addr = ((unsigned long)(struct davinci_gpio *)bank->base) +  in davinci_get_gpio_bank()
454 	 * Fetch the address based on GPIO, but only pass the masked low 32-bits  in davinci_gpio_direction_input()
502 	desc->offset = args->args[0];  in davinci_gpio_xlate()
504 	if (args->args[1] & GPIO_ACTIVE_LOW)  in davinci_gpio_xlate()
505 		desc->flags = GPIOD_ACTIVE_LOW;  in davinci_gpio_xlate()
507 		desc->flags = 0;  in davinci_gpio_xlate()
525 	const void *fdt = gd->fdt_blob;  in davinci_gpio_probe()
528 	uc_priv->bank_name = plat->port_name;  in davinci_gpio_probe()
529 	uc_priv->gpio_count = fdtdec_get_int(fdt, node, "ti,ngpio", -1);  in davinci_gpio_probe()
530 	bank->base = (struct davinci_gpio *)plat->base;  in davinci_gpio_probe()
535 	{ .compatible = "ti,dm6441-gpio" },
536 	{ .compatible = "ti,k2g-gpio" },
547 		return -EINVAL;  in davinci_gpio_ofdata_to_platdata()
549 	plat->base = addr;  in davinci_gpio_ofdata_to_platdata()