1 // SPDX-License-Identifier: GPL-2.0+
65 /* not an actual device number, just a value meaning 'no device' */
68 /* registers with offsets >= 0x30 are specific for a particular device */
127  * for a description what a particular field of this struct means please see
128  * a description of the relevant module parameter at the bottom of this file
145 		return -EBUSY;  in winbond_sio_enter()
157 static void winbond_sio_select_logical(unsigned long base, u8 dev)  in winbond_sio_select_logical()  argument
160 	outb(dev, base + 1);  in winbond_sio_select_logical()
206  * struct winbond_gpio_port_conflict - possibly conflicting device information
208  * @dev:	Super I/O logical device number where the testreg register
209  *		is located (or WB_SIO_DEV_NONE - don't select any
212  * @testbit:	index of a bit to check whether an actual conflict exists
213  * @warnonly:	if set then a conflict isn't fatal (just warn about it),
214  *		otherwise disable the particular GPIO port if a conflict
219 	u8 dev;  member
226  * struct winbond_gpio_info - information about a particular GPIO port (device)
227  * @dev:		Super I/O logical device number of the registers
230  * @enablebit:		index of a port enable bit
232  * @outputppbit:	index of a push-pull output driver mode bit
236  * @conflict:		description of a device that possibly conflicts with
240 	u8 dev;  member
253 		.dev = WB_SIO_DEV_GPIO12,
263 			.dev = WB_SIO_DEV_UARTB,
270 		.dev = WB_SIO_DEV_GPIO12,
281 		.dev = WB_SIO_DEV_GPIO34,
291 			.dev = WB_SIO_DEV_UARTC,
298 		.dev = WB_SIO_DEV_GPIO34,
308 			.dev = WB_SIO_DEV_UARTD,
315 		.dev = WB_SIO_DEV_WDGPIO56,
325 			.dev = WB_SIO_DEV_UARTE,
332 		.dev = WB_SIO_DEV_WDGPIO56,
342 			.dev = WB_SIO_DEV_NONE,
350 /* returns whether changing a pin is allowed */
361 		*gpio_num -= 8;  in winbond_gpio_get_info()
367 	 * GPIO2 (the second port) shares some pins with a basic PC  in winbond_gpio_get_info()
369 	 * Don't allow changing these pins by default.  in winbond_gpio_get_info()
396 	winbond_sio_select_logical(*base, info->dev);  in winbond_gpio_get()
398 	val = winbond_sio_reg_btest(*base, info->datareg, offset);  in winbond_gpio_get()
399 	if (winbond_sio_reg_btest(*base, info->invreg, offset))  in winbond_gpio_get()
414 		return -EACCES;  in winbond_gpio_direction_in()
420 	winbond_sio_select_logical(*base, info->dev);  in winbond_gpio_direction_in()
422 	winbond_sio_reg_bset(*base, info->ioreg, offset);  in winbond_gpio_direction_in()
438 		return -EACCES;  in winbond_gpio_direction_out()
444 	winbond_sio_select_logical(*base, info->dev);  in winbond_gpio_direction_out()
446 	winbond_sio_reg_bclear(*base, info->ioreg, offset);  in winbond_gpio_direction_out()
448 	if (winbond_sio_reg_btest(*base, info->invreg, offset))  in winbond_gpio_direction_out()
452 		winbond_sio_reg_bset(*base, info->datareg, offset);  in winbond_gpio_direction_out()
454 		winbond_sio_reg_bclear(*base, info->datareg, offset);  in winbond_gpio_direction_out()
473 	winbond_sio_select_logical(*base, info->dev);  in winbond_gpio_set()
475 	if (winbond_sio_reg_btest(*base, info->invreg, offset))  in winbond_gpio_set()
479 		winbond_sio_reg_bset(*base, info->datareg, offset);  in winbond_gpio_set()
481 		winbond_sio_reg_bclear(*base, info->datareg, offset);  in winbond_gpio_set()
487 	.base			= -1,
505 	pr_warn("GPIO1 pins were connected to something else (%.2x), fixing\n",  in winbond_gpio_configure_port0_pins()
525 	const struct winbond_gpio_port_conflict *conflict = &info->conflict;  in winbond_gpio_configure_port()
527 	/* is there a possible conflicting device defined? */  in winbond_gpio_configure_port()
528 	if (conflict->name != NULL) {  in winbond_gpio_configure_port()
529 		if (conflict->dev != WB_SIO_DEV_NONE)  in winbond_gpio_configure_port()
530 			winbond_sio_select_logical(base, conflict->dev);  in winbond_gpio_configure_port()
532 		if (winbond_sio_reg_btest(base, conflict->testreg,  in winbond_gpio_configure_port()
533 					  conflict->testbit)) {  in winbond_gpio_configure_port()
534 			if (conflict->warnonly)  in winbond_gpio_configure_port()
535 				pr_warn("enabled GPIO%u share pins with active %s\n",  in winbond_gpio_configure_port()
536 					idx + 1, conflict->name);  in winbond_gpio_configure_port()
539 					idx + 1, conflict->name);  in winbond_gpio_configure_port()
551 	winbond_sio_select_logical(base, info->dev);  in winbond_gpio_configure_port()
553 	winbond_sio_reg_bset(base, info->enablereg, info->enablebit);  in winbond_gpio_configure_port()
556 		winbond_sio_reg_bset(base, info->outputreg,  in winbond_gpio_configure_port()
557 				     info->outputppbit);  in winbond_gpio_configure_port()
559 		winbond_sio_reg_bclear(base, info->outputreg,  in winbond_gpio_configure_port()
560 				       info->outputppbit);  in winbond_gpio_configure_port()
562 		pr_notice("GPIO%u pins are %s\n", idx + 1,  in winbond_gpio_configure_port()
563 			  winbond_sio_reg_btest(base, info->outputreg,  in winbond_gpio_configure_port()
564 						info->outputppbit) ?  in winbond_gpio_configure_port()
565 			  "push-pull" :  in winbond_gpio_configure_port()
580 		pr_err("please use 'gpios' module parameter to select some active GPIO ports to enable\n");  in winbond_gpio_configure()
581 		return -EINVAL;  in winbond_gpio_configure()
604 		ret = -ENODEV;  in winbond_gpio_check_chip()
612 static int winbond_gpio_imatch(struct device *dev, unsigned int id)  in winbond_gpio_imatch()  argument
617 	gpios_rem = params.gpios & ~GENMASK(ARRAY_SIZE(winbond_gpio_infos) - 1,  in winbond_gpio_imatch()
626 		pr_err("some GPIO ports are set both to push-pull and open drain mode at the same time\n");  in winbond_gpio_imatch()
641 	if (ret != -ENODEV && ret != -EBUSY)  in winbond_gpio_imatch()
648 static int winbond_gpio_iprobe(struct device *dev, unsigned int id)  in winbond_gpio_iprobe()  argument
653 		return -EINVAL;  in winbond_gpio_iprobe()
669 	 * winbond_gpio_configure() & co. due to, for example, a pin conflict).  in winbond_gpio_iprobe()
674 	 * GPIO6 port has only 5 pins, so if it is enabled we have to adjust  in winbond_gpio_iprobe()
678 		winbond_gpio_chip.ngpio -= (8 - 5);  in winbond_gpio_iprobe()
680 	winbond_gpio_chip.parent = dev;  in winbond_gpio_iprobe()
682 	return devm_gpiochip_add_data(dev, &winbond_gpio_chip, &params.base);  in winbond_gpio_iprobe()
697 		 "I/O port base (when unset - probe chip default ones)");
702 		 "bitmask of GPIO ports to enable (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
706  * It can't be a one bitmask since we need three values per port: push-pull,
707  * open-drain and keep as-is (this is the default).
711 		 "bitmask of GPIO ports to set to push-pull mode (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
715 		 "bitmask of GPIO ports to set to open drain mode (bit 0 - GPIO1, bit 1 - GPIO2, etc.");
718  * GPIO2.0 and GPIO2.1 control a basic PC functionality that we
720  * firmware owns these pins).