1 // SPDX-License-Identifier: GPL-2.0-or-later
10     This is the driver for the SMB Host controller on
25     on the PCI bus. An output of lspci will show something similar
34     ACPI-compliant Power Management Unit (PMU).
42     The SMB Target controller on the M15X3 is not enabled.
82 /* this is what the Award 1004 BIOS sets them to on a ASUS P5A MB.
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()
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()
170 		dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n",  in ali15x3_setup()
178 		if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) {  in ali15x3_setup()
180 			dev_err(&ALI15X3_dev->dev,  in ali15x3_setup()
181 				"force address failed - not supported?\n");  in ali15x3_setup()
188 		dev_info(&ALI15X3_dev->dev, "enabling SMBus device\n");  in ali15x3_setup()
195 		dev_info(&ALI15X3_dev->dev, "enabling SMBus controller\n");  in ali15x3_setup()
207 		dev_dbg(&ALI15X3_dev->dev, "ALI15X3 using Interrupt 9 for SMBus.\n");  in ali15x3_setup()
210 	dev_dbg(&ALI15X3_dev->dev, "SMBREV = 0x%X\n", temp);  in ali15x3_setup()
211 	dev_dbg(&ALI15X3_dev->dev, "iALI15X3_smba = 0x%X\n", ali15x3_smba);  in ali15x3_setup()
216 	return -ENODEV;  in ali15x3_setup()
224 	int timeout = 0;  in ali15x3_transaction()  local
226 	dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, CNT=%02x, CMD=%02x, "  in ali15x3_transaction()
239 	   previous transaction, resulting in a "SMBus Timeout" Dev.  in ali15x3_transaction()
240 	   I've tried the following to reset a stuck busy bit.  in ali15x3_transaction()
241 		1. Reset the controller with an ABORT command.  in ali15x3_transaction()
244 		2. Reset the controller and the other SMBus devices with a  in ali15x3_transaction()
249 	   Worst case, nothing seems to work except power reset.  in ali15x3_transaction()
251 	/* Abort - reset the host controller */  in ali15x3_transaction()
253 	   Try resetting entire SMB bus, including other devices -  in ali15x3_transaction()
254 	   This may not work either - it clears the BUSY bit but  in ali15x3_transaction()
255 	   then the BUSY bit may come back on when you try and use the chip again.  in ali15x3_transaction()
258 		dev_info(&adap->dev, "Resetting entire SMB Bus to "  in ali15x3_transaction()
266 		/* do a clear-on-write */  in ali15x3_transaction()
270 			/* this is probably going to be correctable only by a power reset  in ali15x3_transaction()
273 			dev_err(&adap->dev, "SMBus reset failed! (0x%02x) - "  in ali15x3_transaction()
274 				"controller or device on bus is probably hung\n",  in ali15x3_transaction()
276 			return -EBUSY;  in ali15x3_transaction()
289 	timeout = 0;  in ali15x3_transaction()
294 		 && (timeout++ < MAX_TIMEOUT));  in ali15x3_transaction()
297 	if (timeout > MAX_TIMEOUT)  in ali15x3_transaction()
298 		result = -ETIMEDOUT;  in ali15x3_transaction()
301 		result = -EIO;  in ali15x3_transaction()
302 		dev_dbg(&adap->dev, "Error: Failed bus transaction\n");  in ali15x3_transaction()
312 		result = -ENXIO;  in ali15x3_transaction()
313 		dev_dbg(&adap->dev,  in ali15x3_transaction()
320 		result = -EIO;  in ali15x3_transaction()
321 		dev_err(&adap->dev, "Error: device error\n");  in ali15x3_transaction()
323 	dev_dbg(&adap->dev, "Transaction (post): STS=%02x, CNT=%02x, CMD=%02x, "  in ali15x3_transaction()
330 /* Return negative errno on error. */
337 	int timeout;  in ali15x3_access()  local
339 	/* clear all the bits (clear-on-write) */  in ali15x3_access()
343 	for (timeout = 0;  in ali15x3_access()
344 	     (timeout < MAX_TIMEOUT) && !(temp & ALI15X3_STS_IDLE);  in ali15x3_access()
345 	     timeout++) {  in ali15x3_access()
349 	if (timeout >= MAX_TIMEOUT) {  in ali15x3_access()
350 		dev_err(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);  in ali15x3_access()
371 			outb_p(data->byte, SMBHSTDAT0);  in ali15x3_access()
379 			outb_p(data->word & 0xff, SMBHSTDAT0);  in ali15x3_access()
380 			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);  in ali15x3_access()
389 			len = data->block[0];  in ali15x3_access()
392 				data->block[0] = len;  in ali15x3_access()
396 				data->block[0] = len;  in ali15x3_access()
399 			/* Reset SMBBLKDAT */  in ali15x3_access()
402 				outb_p(data->block[i], SMBBLKDAT);  in ali15x3_access()
407 		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);  in ali15x3_access()
408 		return -EOPNOTSUPP;  in ali15x3_access()
423 		data->byte = inb_p(SMBHSTDAT0);  in ali15x3_access()
426 		data->byte = inb_p(SMBHSTDAT0);  in ali15x3_access()
429 		data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);  in ali15x3_access()
435 		data->block[0] = len;  in ali15x3_access()
436 		/* Reset SMBBLKDAT */  in ali15x3_access()
438 		for (i = 1; i <= data->block[0]; i++) {  in ali15x3_access()
439 			data->block[i] = inb_p(SMBBLKDAT);  in ali15x3_access()
440 			dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n",  in ali15x3_access()
441 				len, i, data->block[i]);  in ali15x3_access()
478 		dev_err(&dev->dev,  in ali15x3_probe()
480 		return -ENODEV;  in ali15x3_probe()
484 	ali15x3_adapter.dev.parent = &dev->dev;  in ali15x3_probe()