1 // SPDX-License-Identifier: GPL-2.0-or-later
34     ACPI-compliant Power Management Unit (PMU).
47 /* Note: we assume there can only be one ALI15X3, with one SMBus interface */
59 /* ALI15X3 SMBus address offsets */
127 		- SMB I/O address is initialized  in ali15x3_setup()
128 		- Device is enabled  in ali15x3_setup()
129 		- We can use the addresses  in ali15x3_setup()
133 	   The data sheet says that the address registers are read-only  in ali15x3_setup()
143 	/* Determine the address of the SMBus area */  in ali15x3_setup()
145 	ali15x3_smba &= (0xffff & ~(ALI15X3_SMB_IOSIZE - 1));  in ali15x3_setup()
147 		dev_err(&ALI15X3_dev->dev, "ALI15X3_smb region uninitialized "  in ali15x3_setup()
148 			"- upgrade BIOS or use force_addr=0xaddr\n");  in ali15x3_setup()
149 		return -ENODEV;  in ali15x3_setup()
153 		ali15x3_smba = force_addr & ~(ALI15X3_SMB_IOSIZE - 1);  in ali15x3_setup()
157 		return -EBUSY;  in ali15x3_setup()
161 		dev_err(&ALI15X3_dev->dev,  in ali15x3_setup()
164 		return -ENODEV;  in ali15x3_setup()
168 		dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",  in ali15x3_setup()
177 		if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {  in ali15x3_setup()
179 			dev_err(&ALI15X3_dev->dev,  in ali15x3_setup()
180 				"force address failed - not supported?\n");  in ali15x3_setup()
187 		dev_info(&ALI15X3_dev->dev, "enabling SMBus device\n");  in ali15x3_setup()
194 		dev_info(&ALI15X3_dev->dev, "enabling SMBus controller\n");  in ali15x3_setup()
206 		dev_dbg(&ALI15X3_dev->dev, "ALI15X3 using Interrupt 9 for SMBus.\n");  in ali15x3_setup()
209 	dev_dbg(&ALI15X3_dev->dev, "SMBREV = 0x%X\n", temp);  in ali15x3_setup()
210 	dev_dbg(&ALI15X3_dev->dev, "iALI15X3_smba = 0x%X\n", ali15x3_smba);  in ali15x3_setup()
215 	return -ENODEV;  in ali15x3_setup()
223 	int timeout = 0;  in ali15x3_transaction()  local
225 	dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, CNT=%02x, CMD=%02x, "  in ali15x3_transaction()
233 	/* Make sure the SMBus host is ready to start transmitting */  in ali15x3_transaction()
238 	   previous transaction, resulting in a "SMBus Timeout" Dev.  in ali15x3_transaction()
243 		2. Reset the controller and the other SMBus devices with a  in ali15x3_transaction()
247 		3. Disable and reenable the controller in SMBHSTCFG  in ali15x3_transaction()
250 	/* Abort - reset the host controller */  in ali15x3_transaction()
252 	   Try resetting entire SMB bus, including other devices -  in ali15x3_transaction()
253 	   This may not work either - it clears the BUSY bit but  in ali15x3_transaction()
257 		dev_info(&adap->dev, "Resetting entire SMB Bus to "  in ali15x3_transaction()
265 		/* do a clear-on-write */  in ali15x3_transaction()
272 			dev_err(&adap->dev, "SMBus reset failed! (0x%02x) - "  in ali15x3_transaction()
275 			return -EBUSY;  in ali15x3_transaction()
288 	timeout = 0;  in ali15x3_transaction()
293 		 && (timeout++ < MAX_TIMEOUT));  in ali15x3_transaction()
295 	/* If the SMBus is still busy, we give up */  in ali15x3_transaction()
296 	if (timeout > MAX_TIMEOUT) {  in ali15x3_transaction()
297 		result = -ETIMEDOUT;  in ali15x3_transaction()
298 		dev_err(&adap->dev, "SMBus Timeout!\n");  in ali15x3_transaction()
302 		result = -EIO;  in ali15x3_transaction()
303 		dev_dbg(&adap->dev, "Error: Failed bus transaction\n");  in ali15x3_transaction()
313 		result = -ENXIO;  in ali15x3_transaction()
314 		dev_dbg(&adap->dev,  in ali15x3_transaction()
321 		result = -EIO;  in ali15x3_transaction()
322 		dev_err(&adap->dev, "Error: device error\n");  in ali15x3_transaction()
324 	dev_dbg(&adap->dev, "Transaction (post): STS=%02x, CNT=%02x, CMD=%02x, "  in ali15x3_transaction()
338 	int timeout;  in ali15x3_access()  local
340 	/* clear all the bits (clear-on-write) */  in ali15x3_access()
342 	/* make sure SMBus is idle */  in ali15x3_access()
344 	for (timeout = 0;  in ali15x3_access()
345 	     (timeout < MAX_TIMEOUT) && !(temp & ALI15X3_STS_IDLE);  in ali15x3_access()
346 	     timeout++) {  in ali15x3_access()
350 	if (timeout >= MAX_TIMEOUT) {  in ali15x3_access()
351 		dev_err(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);  in ali15x3_access()
372 			outb_p(data->byte, SMBHSTDAT0);  in ali15x3_access()
380 			outb_p(data->word & 0xff, SMBHSTDAT0);  in ali15x3_access()
381 			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);  in ali15x3_access()
390 			len = data->block[0];  in ali15x3_access()
393 				data->block[0] = len;  in ali15x3_access()
397 				data->block[0] = len;  in ali15x3_access()
403 				outb_p(data->block[i], SMBBLKDAT);  in ali15x3_access()
408 		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);  in ali15x3_access()
409 		return -EOPNOTSUPP;  in ali15x3_access()
424 		data->byte = inb_p(SMBHSTDAT0);  in ali15x3_access()
427 		data->byte = inb_p(SMBHSTDAT0);  in ali15x3_access()
430 		data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);  in ali15x3_access()
436 		data->block[0] = len;  in ali15x3_access()
439 		for (i = 1; i <= data->block[0]; i++) {  in ali15x3_access()
440 			data->block[i] = inb_p(SMBBLKDAT);  in ali15x3_access()
441 			dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n",  in ali15x3_access()
442 				len, i, data->block[i]);  in ali15x3_access()
477 		dev_err(&dev->dev,  in ali15x3_probe()
479 		return -ENODEV;  in ali15x3_probe()
483 	ali15x3_adapter.dev.parent = &dev->dev;  in ali15x3_probe()
486 		"SMBus ALI15X3 adapter at %04x", ali15x3_smba);  in ali15x3_probe()
508 MODULE_DESCRIPTION("ALI15X3 SMBus driver");