2 SMBus driver for nVidia nForce2 MCP
4 Added nForce3 Pro 150 Thomas Leibold <thomas@plx.com>,
5 Ported to 2.5 Patrick Dreker <patrick@dreker.de>,
6 Copyright (c) 2003 Hans-Frieder Vogt <hfvogt@arcor.de>,
8 SMBus 2.0 driver for AMD-8111 IO-Hub
9 Copyright (c) 2002 Vojtech Pavlik
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 SUPPORTED DEVICES PCI ID
29 nForce2 Ultra 400 MCP 0084
30 nForce3 Pro150 MCP 00D4
31 nForce3 250Gb MCP 00E4
37 This driver supports the 2 SMBuses that are included in the MCP of the
38 nForce2/3/4/5xx chipsets.
41 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
43 #include <linux/module.h>
44 #include <linux/pci.h>
45 #include <linux/kernel.h>
46 #include <linux/stddef.h>
47 #include <linux/sched.h>
48 #include <linux/ioport.h>
49 #include <linux/init.h>
50 #include <linux/i2c.h>
51 #include <linux/delay.h>
54 MODULE_LICENSE("GPL");
55 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");
56 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
59 struct nforce2_smbus {
60 struct i2c_adapter adapter;
67 * nVidia nForce2 SMBus control register definitions
68 * (Newer incarnations use standard BARs 4 and 5 instead)
70 #define NFORCE_PCI_SMB1 0x50
71 #define NFORCE_PCI_SMB2 0x54
75 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
77 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
78 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
79 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
80 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
81 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
83 #define NVIDIA_SMB_STS_DONE 0x80
84 #define NVIDIA_SMB_STS_ALRM 0x40
85 #define NVIDIA_SMB_STS_RES 0x20
86 #define NVIDIA_SMB_STS_STATUS 0x1f
88 #define NVIDIA_SMB_PRTCL_WRITE 0x00
89 #define NVIDIA_SMB_PRTCL_READ 0x01
90 #define NVIDIA_SMB_PRTCL_QUICK 0x02
91 #define NVIDIA_SMB_PRTCL_BYTE 0x04
92 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
93 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
94 #define NVIDIA_SMB_PRTCL_PEC 0x80
96 static struct pci_driver nforce2_driver;
98 /* Return -1 on error */
99 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
100 unsigned short flags, char read_write,
101 u8 command, int size, union i2c_smbus_data * data)
103 struct nforce2_smbus *smbus = adap->algo_data;
104 unsigned char protocol, pec, temp;
106 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
107 NVIDIA_SMB_PRTCL_WRITE;
108 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
112 case I2C_SMBUS_QUICK:
113 protocol |= NVIDIA_SMB_PRTCL_QUICK;
114 read_write = I2C_SMBUS_WRITE;
118 if (read_write == I2C_SMBUS_WRITE)
119 outb_p(command, NVIDIA_SMB_CMD);
120 protocol |= NVIDIA_SMB_PRTCL_BYTE;
123 case I2C_SMBUS_BYTE_DATA:
124 outb_p(command, NVIDIA_SMB_CMD);
125 if (read_write == I2C_SMBUS_WRITE)
126 outb_p(data->byte, NVIDIA_SMB_DATA);
127 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
130 case I2C_SMBUS_WORD_DATA:
131 outb_p(command, NVIDIA_SMB_CMD);
132 if (read_write == I2C_SMBUS_WRITE) {
133 outb_p(data->word, NVIDIA_SMB_DATA);
134 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
136 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
140 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
144 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
145 outb_p(protocol, NVIDIA_SMB_PRTCL);
147 temp = inb_p(NVIDIA_SMB_STS);
149 if (~temp & NVIDIA_SMB_STS_DONE) {
151 temp = inb_p(NVIDIA_SMB_STS);
153 if (~temp & NVIDIA_SMB_STS_DONE) {
155 temp = inb_p(NVIDIA_SMB_STS);
158 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
159 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
163 if (read_write == I2C_SMBUS_WRITE)
169 case I2C_SMBUS_BYTE_DATA:
170 data->byte = inb_p(NVIDIA_SMB_DATA);
173 case I2C_SMBUS_WORD_DATA:
174 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
182 static u32 nforce2_func(struct i2c_adapter *adapter)
184 /* other functionality might be possible, but is not tested */
185 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
186 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA;
189 static struct i2c_algorithm smbus_algorithm = {
190 .smbus_xfer = nforce2_access,
191 .functionality = nforce2_func,
195 static struct pci_device_id nforce2_ids[] = {
196 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
197 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
198 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
199 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
200 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
201 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
202 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
203 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
207 MODULE_DEVICE_TABLE (pci, nforce2_ids);
210 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
211 int alt_reg, struct nforce2_smbus *smbus, const char *name)
215 smbus->base = pci_resource_start(dev, bar);
217 smbus->size = pci_resource_len(dev, bar);
219 /* Older incarnations of the device used non-standard BARs */
222 if (pci_read_config_word(dev, alt_reg, &iobase)
223 != PCIBIOS_SUCCESSFUL) {
224 dev_err(&dev->dev, "Error reading PCI config for %s\n",
229 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
233 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
234 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
235 smbus->base, smbus->base+smbus->size-1, name);
238 smbus->adapter.owner = THIS_MODULE;
239 smbus->adapter.id = I2C_HW_SMBUS_NFORCE2;
240 smbus->adapter.class = I2C_CLASS_HWMON;
241 smbus->adapter.algo = &smbus_algorithm;
242 smbus->adapter.algo_data = smbus;
243 smbus->adapter.dev.parent = &dev->dev;
244 snprintf(smbus->adapter.name, I2C_NAME_SIZE,
245 "SMBus nForce2 adapter at %04x", smbus->base);
247 error = i2c_add_adapter(&smbus->adapter);
249 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
250 release_region(smbus->base, smbus->size);
253 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
258 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
260 struct nforce2_smbus *smbuses;
263 /* we support 2 SMBus adapters */
264 if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
266 pci_set_drvdata(dev, smbuses);
268 /* SMBus adapter 1 */
269 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
271 dev_err(&dev->dev, "Error probing SMB1.\n");
272 smbuses[0].base = 0; /* to have a check value */
274 /* SMBus adapter 2 */
275 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
277 dev_err(&dev->dev, "Error probing SMB2.\n");
278 smbuses[1].base = 0; /* to have a check value */
280 if ((res1 < 0) && (res2 < 0)) {
281 /* we did not find even one of the SMBuses, so we give up */
290 static void __devexit nforce2_remove(struct pci_dev *dev)
292 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
294 if (smbuses[0].base) {
295 i2c_del_adapter(&smbuses[0].adapter);
296 release_region(smbuses[0].base, smbuses[0].size);
298 if (smbuses[1].base) {
299 i2c_del_adapter(&smbuses[1].adapter);
300 release_region(smbuses[1].base, smbuses[1].size);
305 static struct pci_driver nforce2_driver = {
306 .name = "nForce2_smbus",
307 .id_table = nforce2_ids,
308 .probe = nforce2_probe,
309 .remove = __devexit_p(nforce2_remove),
312 static int __init nforce2_init(void)
314 return pci_register_driver(&nforce2_driver);
317 static void __exit nforce2_exit(void)
319 pci_unregister_driver(&nforce2_driver);
322 module_init(nforce2_init);
323 module_exit(nforce2_exit);