1 // SPDX-License-Identifier: GPL-2.0-or-later
3     SMBus driver for nVidia nForce2 MCP
7     Copyright (c) 2003  Hans-Frieder Vogt <hfvogt@arcor.de>,
9     SMBus 2.0 driver for AMD-8111 IO-Hub
21     nForce4 MCP-04		0034
35 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
50 MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
51 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
64  * nVidia nForce2 SMBus control register definitions
72  * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
74 #define NVIDIA_SMB_PRTCL	(smbus->base + 0x00)	/* protocol, PEC */
75 #define NVIDIA_SMB_STS		(smbus->base + 0x01)	/* status */
76 #define NVIDIA_SMB_ADDR		(smbus->base + 0x02)	/* address */
77 #define NVIDIA_SMB_CMD		(smbus->base + 0x03)	/* command */
78 #define NVIDIA_SMB_DATA		(smbus->base + 0x04)	/* 32 data registers */
79 #define NVIDIA_SMB_BCNT		(smbus->base + 0x24)	/* number of data
81 #define NVIDIA_SMB_STATUS_ABRT	(smbus->base + 0x3c)	/* register used to
84 #define NVIDIA_SMB_CTRL		(smbus->base + 0x3e)	/* control register */
106 /* We disable the second SMBus channel on these boards */
121    SMBus channel */
136 	struct nforce2_smbus *smbus = adap->algo_data;  in nforce2_abort()  local
137 	int timeout = 0;  in nforce2_abort()  local
140 	dev_dbg(&adap->dev, "Aborting current transaction\n");  in nforce2_abort()
147 			(timeout++ < MAX_TIMEOUT));  in nforce2_abort()
149 		dev_err(&adap->dev, "Can't reset the smbus\n");  in nforce2_abort()
155 	struct nforce2_smbus *smbus = adap->algo_data;  in nforce2_check_status()  local
156 	int timeout = 0;  in nforce2_check_status()  local
162 	} while ((!temp) && (timeout++ < MAX_TIMEOUT));  in nforce2_check_status()
164 	if (timeout > MAX_TIMEOUT) {  in nforce2_check_status()
165 		dev_dbg(&adap->dev, "SMBus Timeout!\n");  in nforce2_check_status()
166 		if (smbus->can_abort)  in nforce2_check_status()
168 		return -ETIMEDOUT;  in nforce2_check_status()
171 		dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);  in nforce2_check_status()
172 		return -EIO;  in nforce2_check_status()
182 	struct nforce2_smbus *smbus = adap->algo_data;  in nforce2_access()  local
206 			outb_p(data->byte, NVIDIA_SMB_DATA);  in nforce2_access()
213 			outb_p(data->word, NVIDIA_SMB_DATA);  in nforce2_access()
214 			outb_p(data->word >> 8, NVIDIA_SMB_DATA + 1);  in nforce2_access()
222 			len = data->block[0];  in nforce2_access()
224 				dev_err(&adap->dev,  in nforce2_access()
227 				return -EINVAL;  in nforce2_access()
231 				outb_p(data->block[i + 1],  in nforce2_access()
238 		dev_err(&adap->dev, "Unsupported transaction %d\n", size);  in nforce2_access()
239 		return -EOPNOTSUPP;  in nforce2_access()
255 		data->byte = inb_p(NVIDIA_SMB_DATA);  in nforce2_access()
259 		data->word = inb_p(NVIDIA_SMB_DATA) |  in nforce2_access()
266 			dev_err(&adap->dev,  in nforce2_access()
269 			return -EPROTO;  in nforce2_access()
272 			data->block[i + 1] = inb_p(NVIDIA_SMB_DATA + i);  in nforce2_access()
273 		data->block[0] = len;  in nforce2_access()
287 	       (((struct nforce2_smbus *)adapter->algo_data)->blockops ?  in nforce2_func()
319 			     struct nforce2_smbus *smbus, const char *name)  in nforce2_probe_smb()  argument
323 	smbus->base = pci_resource_start(dev, bar);  in nforce2_probe_smb()
324 	if (smbus->base) {  in nforce2_probe_smb()
325 		smbus->size = pci_resource_len(dev, bar);  in nforce2_probe_smb()
327 		/* Older incarnations of the device used non-standard BARs */  in nforce2_probe_smb()
332 			dev_err(&dev->dev, "Error reading PCI config for %s\n",  in nforce2_probe_smb()
334 			return -EIO;  in nforce2_probe_smb()
337 		smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;  in nforce2_probe_smb()
338 		smbus->size = 64;  in nforce2_probe_smb()
341 	error = acpi_check_region(smbus->base, smbus->size,  in nforce2_probe_smb()
346 	if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {  in nforce2_probe_smb()
347 		dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",  in nforce2_probe_smb()
348 			smbus->base, smbus->base+smbus->size-1, name);  in nforce2_probe_smb()
349 		return -EBUSY;  in nforce2_probe_smb()
351 	smbus->adapter.owner = THIS_MODULE;  in nforce2_probe_smb()
352 	smbus->adapter.class = I2C_CLASS_HWMON;  in nforce2_probe_smb()
353 	smbus->adapter.algo = &smbus_algorithm;  in nforce2_probe_smb()
354 	smbus->adapter.algo_data = smbus;  in nforce2_probe_smb()
355 	smbus->adapter.dev.parent = &dev->dev;  in nforce2_probe_smb()
356 	snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),  in nforce2_probe_smb()
357 		"SMBus nForce2 adapter at %04x", smbus->base);  in nforce2_probe_smb()
359 	error = i2c_add_adapter(&smbus->adapter);  in nforce2_probe_smb()
361 		release_region(smbus->base, smbus->size);  in nforce2_probe_smb()
364 	dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n",  in nforce2_probe_smb()
365 		smbus->base);  in nforce2_probe_smb()
375 	/* we support 2 SMBus adapters */  in nforce2_probe()
378 		return -ENOMEM;  in nforce2_probe()
381 	switch (dev->device) {  in nforce2_probe()
391 	/* SMBus adapter 1 */  in nforce2_probe()
396 	/* SMBus adapter 2 */  in nforce2_probe()
398 		dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");  in nforce2_probe()
399 		res2 = -EPERM;  in nforce2_probe()
411 		return -ENODEV;  in nforce2_probe()