1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *   Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com>           *
20 #include "sch56xx-common.h"
29 #define SIO_UNLOCK_KEY		0x55	/* Key to enable Super-I/O */
30 #define SIO_LOCK_KEY		0xAA	/* Key to disable Super-I/O */
76 		return -EBUSY;  in superio_enter()
103 	 * responds within 15-32 reads, so we first busy poll, and if  in sch56xx_send_cmd()
110 	/* (Optional) Write-Clear the EC to Host Mailbox Register */  in sch56xx_send_cmd()
114 	/* Set Mailbox Address Pointer to first location in Region 1 */  in sch56xx_send_cmd()
120 	outb(0x01, addr + 5); /* # of Entries: 1 Byte (8-bit) */  in sch56xx_send_cmd()
121 	outb(0x04, addr + 2); /* Mailbox AP to first data entry loc. */  in sch56xx_send_cmd()
132 	outb(0x01, addr); /* Write 01h to the Host-to-EC register */  in sch56xx_send_cmd()
150 		return -EIO;  in sch56xx_send_cmd()
158 		/* Read EC-to-Host Register */  in sch56xx_send_cmd()
171 		return -EIO;  in sch56xx_send_cmd()
177 	 * Set Mailbox Address Pointer to first location in Region 1 *  in sch56xx_send_cmd()
205 	int lsb, msb;  in sch56xx_read_virtual_reg16()  local
207 	/* Read LSB first, this will cause the matching MSB to be latched */  in sch56xx_read_virtual_reg16()
208 	lsb = sch56xx_read_virtual_reg(addr, reg);  in sch56xx_read_virtual_reg16()
209 	if (lsb < 0)  in sch56xx_read_virtual_reg16()
210 		return lsb;  in sch56xx_read_virtual_reg16()
216 	return lsb | (msb << 8);  in sch56xx_read_virtual_reg16()
225 	/* Read MSB first, this will cause the matching LSN to be latched */  in sch56xx_read_virtual_reg12()
260 		return -EINVAL;  in watchdog_set_timeout()
263 		control = data->watchdog_control | SCH56XX_WDOG_TIME_BASE_SEC;  in watchdog_set_timeout()
265 		control = data->watchdog_control & ~SCH56XX_WDOG_TIME_BASE_SEC;  in watchdog_set_timeout()
267 	if (data->watchdog_control != control) {  in watchdog_set_timeout()
268 		mutex_lock(data->io_lock);  in watchdog_set_timeout()
269 		ret = sch56xx_write_virtual_reg(data->addr,  in watchdog_set_timeout()
272 		mutex_unlock(data->io_lock);  in watchdog_set_timeout()
276 		data->watchdog_control = control;  in watchdog_set_timeout()
283 	data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);  in watchdog_set_timeout()
284 	wddev->timeout = data->watchdog_preset * resolution;  in watchdog_set_timeout()
301 	 * of the second interrupt source register (at base-address + 9),  in watchdog_start()
304 	 * This will only cause a system reset if the 0-1 flank happens when  in watchdog_start()
311 	 * first!  in watchdog_start()
314 	mutex_lock(data->io_lock);  in watchdog_start()
317 	ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET,  in watchdog_start()
318 					data->watchdog_preset);  in watchdog_start()
323 	val = data->watchdog_output_enable | SCH56XX_WDOG_OUTPUT_ENABLE;  in watchdog_start()
324 	ret = sch56xx_write_virtual_reg(data->addr,  in watchdog_start()
329 	data->watchdog_output_enable = val;  in watchdog_start()
332 	val = inb(data->addr + 9);  in watchdog_start()
334 		outb(0x01, data->addr + 9);  in watchdog_start()
337 	mutex_unlock(data->io_lock);  in watchdog_start()
347 	mutex_lock(data->io_lock);  in watchdog_trigger()
348 	ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET,  in watchdog_trigger()
349 					data->watchdog_preset);  in watchdog_trigger()
350 	mutex_unlock(data->io_lock);  in watchdog_trigger()
361 	val = data->watchdog_output_enable & ~SCH56XX_WDOG_OUTPUT_ENABLE;  in watchdog_stop()
362 	mutex_lock(data->io_lock);  in watchdog_stop()
363 	ret = sch56xx_write_virtual_reg(data->addr,  in watchdog_stop()
365 	mutex_unlock(data->io_lock);  in watchdog_stop()
369 	data->watchdog_output_enable = val;  in watchdog_stop()
408 	data->addr = addr;  in sch56xx_watchdog_register()
409 	data->io_lock = io_lock;  in sch56xx_watchdog_register()
411 	strscpy(data->wdinfo.identity, "sch56xx watchdog", sizeof(data->wdinfo.identity));  in sch56xx_watchdog_register()
412 	data->wdinfo.firmware_version = revision;  in sch56xx_watchdog_register()
413 	data->wdinfo.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT;  in sch56xx_watchdog_register()
415 		data->wdinfo.options |= WDIOF_MAGICCLOSE;  in sch56xx_watchdog_register()
417 	data->wddev.info = &data->wdinfo;  in sch56xx_watchdog_register()
418 	data->wddev.ops = &watchdog_ops;  in sch56xx_watchdog_register()
419 	data->wddev.parent = parent;  in sch56xx_watchdog_register()
420 	data->wddev.timeout = 60;  in sch56xx_watchdog_register()
421 	data->wddev.min_timeout = 1;  in sch56xx_watchdog_register()
422 	data->wddev.max_timeout = 255 * 60;  in sch56xx_watchdog_register()
423 	watchdog_set_nowayout(&data->wddev, nowayout);  in sch56xx_watchdog_register()
425 		set_bit(WDOG_HW_RUNNING, &data->wddev.status);  in sch56xx_watchdog_register()
428 	   the BIOS set timeout from (if any was set at all) ->  in sch56xx_watchdog_register()
431 		data->watchdog_preset = 60; /* seconds */  in sch56xx_watchdog_register()
433 		data->watchdog_preset = 1; /* minute */  in sch56xx_watchdog_register()
435 	data->watchdog_control = control;  in sch56xx_watchdog_register()
436 	data->watchdog_output_enable = output_enable;  in sch56xx_watchdog_register()
438 	watchdog_set_drvdata(&data->wddev, data);  in sch56xx_watchdog_register()
439 	err = devm_watchdog_register_device(parent, &data->wddev);  in sch56xx_watchdog_register()
472 		err = -ENODEV;  in sch56xx_find()
480 		err = -ENODEV;  in sch56xx_find()
492 		err = -ENODEV;  in sch56xx_find()
506 		.end	= address + REGION_LENGTH - 1,  in sch56xx_device_add()
516 	sch56xx_pdev = platform_device_register_simple(name, -1, &res, 1);  in sch56xx_device_add()