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 */
53 	u16 addr;  member
76 		return -EBUSY;  in superio_enter()
96 static int sch56xx_send_cmd(u16 addr, u8 cmd, u16 reg, u8 v)  in sch56xx_send_cmd()  argument
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()
111 	val = inb(addr + 1);  in sch56xx_send_cmd()
112 	outb(val, addr + 1);  in sch56xx_send_cmd()
115 	outb(0x00, addr + 2);  in sch56xx_send_cmd()
116 	outb(0x80, addr + 3);  in sch56xx_send_cmd()
119 	outb(cmd, addr + 4); /* VREG Access Type read:0x02 write:0x03 */  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()
125 		outb(v, addr + 4);  in sch56xx_send_cmd()
128 	outb(reg & 0xff, addr + 6);  in sch56xx_send_cmd()
129 	outb(reg >> 8, addr + 7);  in sch56xx_send_cmd()
132 	outb(0x01, addr); /* Write 01h to the Host-to-EC register */  in sch56xx_send_cmd()
139 		val = inb(addr + 8);  in sch56xx_send_cmd()
142 			outb(val, addr + 8);  in sch56xx_send_cmd()
150 		return -EIO;  in sch56xx_send_cmd()
158 		/* Read EC-to-Host Register */  in sch56xx_send_cmd()
159 		val = inb(addr + 1);  in sch56xx_send_cmd()
171 		return -EIO;  in sch56xx_send_cmd()
178 	 * outb(0x00, addr + 2);  in sch56xx_send_cmd()
179 	 * outb(0x80, addr + 3);  in sch56xx_send_cmd()
186 		return inb(addr + 4);  in sch56xx_send_cmd()
191 int sch56xx_read_virtual_reg(u16 addr, u16 reg)  in sch56xx_read_virtual_reg()  argument
193 	return sch56xx_send_cmd(addr, SCH56XX_CMD_READ, reg, 0);  in sch56xx_read_virtual_reg()
197 int sch56xx_write_virtual_reg(u16 addr, u16 reg, u8 val)  in sch56xx_write_virtual_reg()  argument
199 	return sch56xx_send_cmd(addr, SCH56XX_CMD_WRITE, reg, val);  in sch56xx_write_virtual_reg()
203 int sch56xx_read_virtual_reg16(u16 addr, u16 reg)  in sch56xx_read_virtual_reg16()  argument
208 	lsb = sch56xx_read_virtual_reg(addr, reg);  in sch56xx_read_virtual_reg16()
212 	msb = sch56xx_read_virtual_reg(addr, reg + 1);  in sch56xx_read_virtual_reg16()
220 int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg,  in sch56xx_read_virtual_reg12()  argument
226 	msb = sch56xx_read_virtual_reg(addr, msb_reg);  in sch56xx_read_virtual_reg12()
230 	lsn = sch56xx_read_virtual_reg(addr, lsn_reg);  in sch56xx_read_virtual_reg12()
248 	struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);  in watchdog_set_timeout()  local
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()
291 	struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);  in watchdog_start()  local
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()
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()
343 	struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);  in watchdog_trigger()  local
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()
357 	struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);  in watchdog_stop()  local
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()
382 	u16 addr, u32 revision, struct mutex *io_lock, int check_enabled)  in sch56xx_watchdog_register()  argument
384 	struct sch56xx_watchdog_data *data;  in sch56xx_watchdog_register()  local
390 		sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_CONTROL);  in sch56xx_watchdog_register()
392 		sch56xx_read_virtual_reg(addr, SCH56XX_REG_WDOG_OUTPUT_ENABLE);  in sch56xx_watchdog_register()
404 	data = kzalloc(sizeof(struct sch56xx_watchdog_data), GFP_KERNEL);  in sch56xx_watchdog_register()
405 	if (!data)  in sch56xx_watchdog_register()
408 	data->addr = addr;  in sch56xx_watchdog_register()
409 	data->io_lock = io_lock;  in sch56xx_watchdog_register()
411 	strlcpy(data->wdinfo.identity, "sch56xx watchdog",  in sch56xx_watchdog_register()
412 		sizeof(data->wdinfo.identity));  in sch56xx_watchdog_register()
413 	data->wdinfo.firmware_version = revision;  in sch56xx_watchdog_register()
414 	data->wdinfo.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT;  in sch56xx_watchdog_register()
416 		data->wdinfo.options |= WDIOF_MAGICCLOSE;  in sch56xx_watchdog_register()
418 	data->wddev.info = &data->wdinfo;  in sch56xx_watchdog_register()
419 	data->wddev.ops = &watchdog_ops;  in sch56xx_watchdog_register()
420 	data->wddev.parent = parent;  in sch56xx_watchdog_register()
421 	data->wddev.timeout = 60;  in sch56xx_watchdog_register()
422 	data->wddev.min_timeout = 1;  in sch56xx_watchdog_register()
423 	data->wddev.max_timeout = 255 * 60;  in sch56xx_watchdog_register()
425 		set_bit(WDOG_NO_WAY_OUT, &data->wddev.status);  in sch56xx_watchdog_register()
427 		set_bit(WDOG_ACTIVE, &data->wddev.status);  in sch56xx_watchdog_register()
430 	   the BIOS set timeout from (if any was set at all) ->  in sch56xx_watchdog_register()
433 		data->watchdog_preset = 60; /* seconds */  in sch56xx_watchdog_register()
435 		data->watchdog_preset = 1; /* minute */  in sch56xx_watchdog_register()
437 	data->watchdog_control = control;  in sch56xx_watchdog_register()
438 	data->watchdog_output_enable = output_enable;  in sch56xx_watchdog_register()
440 	watchdog_set_drvdata(&data->wddev, data);  in sch56xx_watchdog_register()
441 	err = watchdog_register_device(&data->wddev);  in sch56xx_watchdog_register()
444 		kfree(data);  in sch56xx_watchdog_register()
448 	return data;  in sch56xx_watchdog_register()
452 void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data)  in sch56xx_watchdog_unregister()  argument
454 	watchdog_unregister_device(&data->wddev);  in sch56xx_watchdog_unregister()
455 	kfree(data);  in sch56xx_watchdog_unregister()
484 		err = -ENODEV;  in sch56xx_find()
492 		err = -ENODEV;  in sch56xx_find()
504 		err = -ENODEV;  in sch56xx_find()
518 		.end	= address + REGION_LENGTH - 1,  in sch56xx_device_add()
525 		return -ENOMEM;  in sch56xx_device_add()
527 	res.name = sch56xx_pdev->name;  in sch56xx_device_add()