1 // SPDX-License-Identifier: GPL-2.0-or-later
16 	+------------------------+--------------------+-------------------+
18 	+------------------------+--------------------+-------------------+
20 	| SMBus registers offset | 0x80               | 0xE0              |
25 	+------------------------+--------------------+-------------------+
28    Note: we assume there can only be one device, with one SMBus interface.
43 /* SIS630/730/964 SMBus registers */
58 #define MSTO_EN			0x40	/* Host Master Timeout Enable */
100 /* SMBus base address */
126 	/* Make sure the SMBus host is ready to start transmitting. */  in sis630_transaction_start()
129 		dev_dbg(&adap->dev, "SMBus busy (%02x). Resetting...\n", temp);  in sis630_transaction_start()
130 		/* kill smbus transaction */  in sis630_transaction_start()
135 			dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);  in sis630_transaction_start()
136 			return -EBUSY;  in sis630_transaction_start()
138 			dev_dbg(&adap->dev, "Successful!\n");  in sis630_transaction_start()
145 	dev_dbg(&adap->dev, "saved clock 0x%02x\n", *oldclock);  in sis630_transaction_start()
147 	/* disable timeout interrupt,  in sis630_transaction_start()
166 	int temp, result = 0, timeout = 0;  in sis630_transaction_wait()  local
175 	} while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT));  in sis630_transaction_wait()
177 	/* If the SMBus is still busy, we give up */  in sis630_transaction_wait()
178 	if (timeout > MAX_TIMEOUT) {  in sis630_transaction_wait()
179 		dev_dbg(&adap->dev, "SMBus Timeout!\n");  in sis630_transaction_wait()
180 		result = -ETIMEDOUT;  in sis630_transaction_wait()
184 		dev_dbg(&adap->dev, "Error: Failed bus transaction\n");  in sis630_transaction_wait()
185 		result = -ENXIO;  in sis630_transaction_wait()
189 		dev_err(&adap->dev, "Bus collision!\n");  in sis630_transaction_wait()
190 		result = -EAGAIN;  in sis630_transaction_wait()
201 	dev_dbg(&adap->dev,  in sis630_transaction_end()
211 	dev_dbg(&adap->dev,  in sis630_transaction_end()
236 		len = data->block[0];  in sis630_block_data()
243 			dev_dbg(&adap->dev,  in sis630_block_data()
244 				"set data 0x%02x\n", data->block[i]);  in sis630_block_data()
246 			sis630_write(SMB_BYTE + (i - 1) % 8, data->block[i]);  in sis630_block_data()
248 				dev_dbg(&adap->dev,  in sis630_block_data()
255 			} else if ((i - 1) % 8 == 7 || i == len) {  in sis630_block_data()
256 				dev_dbg(&adap->dev,  in sis630_block_data()
259 					dev_dbg(&adap->dev,  in sis630_block_data()
272 					dev_dbg(&adap->dev,  in sis630_block_data()
280 		data->block[0] = len = 0;  in sis630_block_data()
288 				dev_dbg(&adap->dev, "trans_wait failed\n");  in sis630_block_data()
293 				data->block[0] = sis630_read(SMB_COUNT);  in sis630_block_data()
296 			if (data->block[0] > 32)  in sis630_block_data()
297 				data->block[0] = 32;  in sis630_block_data()
299 			dev_dbg(&adap->dev,  in sis630_block_data()
300 				"block data read len=0x%x\n", data->block[0]);  in sis630_block_data()
302 			for (i = 0; i < 8 && len < data->block[0]; i++, len++) {  in sis630_block_data()
303 				dev_dbg(&adap->dev,  in sis630_block_data()
305 				data->block[len + 1] = sis630_read(SMB_BYTE +  in sis630_block_data()
309 			dev_dbg(&adap->dev,  in sis630_block_data()
314 		} while (len < data->block[0]);  in sis630_block_data()
347 			sis630_write(SMB_BYTE, data->byte);  in sis630_access()
356 			sis630_write(SMB_BYTE, data->word & 0xff);  in sis630_access()
357 			sis630_write(SMB_BYTE + 1, (data->word & 0xff00) >> 8);  in sis630_access()
369 		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);  in sis630_access()
370 		return -EOPNOTSUPP;  in sis630_access()
385 		data->byte = sis630_read(SMB_BYTE);  in sis630_access()
389 		data->word = sis630_read(SMB_BYTE) +  in sis630_access()
422 		dev_err(&sis630_dev->dev,  in sis630_setup()
426 		return -ENODEV;  in sis630_setup()
430 	   Enable ACPI first , so we can accsess reg 74-75  in sis630_setup()
434 		dev_err(&sis630_dev->dev, "Error: Can't read bios ctl reg\n");  in sis630_setup()
435 		retval = -ENODEV;  in sis630_setup()
441 		dev_err(&sis630_dev->dev, "Error: Can't enable ACPI\n");  in sis630_setup()
442 		retval = -ENODEV;  in sis630_setup()
449 		dev_err(&sis630_dev->dev,  in sis630_setup()
451 		retval = -ENODEV;  in sis630_setup()
455 	dev_dbg(&sis630_dev->dev, "ACPI base at 0x%04hx\n", acpi_base);  in sis630_setup()
462 	dev_dbg(&sis630_dev->dev, "SMBus base at 0x%04hx\n", smbus_base);  in sis630_setup()
472 		dev_err(&sis630_dev->dev,  in sis630_setup()
473 			"I/O Region 0x%04x-0x%04x for SMBus already in use.\n",  in sis630_setup()
475 			smbus_base + SMB_STS + SIS630_SMB_IOREGION - 1);  in sis630_setup()
476 		retval = -EBUSY;  in sis630_setup()
513 		dev_err(&dev->dev,  in sis630_probe()
516 		return -ENODEV;  in sis630_probe()
520 	sis630_adapter.dev.parent = &dev->dev;  in sis630_probe()
523 		 "SMBus SIS630 adapter at %04x", smbus_base + SMB_STS);  in sis630_probe()
549 MODULE_DESCRIPTION("SIS630 SMBus driver");