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/ioport.h>
48 #include <linux/init.h>
49 #include <linux/i2c.h>
50 #include <linux/delay.h>
53 MODULE_LICENSE("GPL");
54 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");
55 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
58 struct nforce2_smbus {
59 struct i2c_adapter adapter;
66 * nVidia nForce2 SMBus control register definitions
67 * (Newer incarnations use standard BARs 4 and 5 instead)
69 #define NFORCE_PCI_SMB1 0x50
70 #define NFORCE_PCI_SMB2 0x54
74 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
76 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
77 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
78 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
79 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
80 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
82 #define NVIDIA_SMB_STS_DONE 0x80
83 #define NVIDIA_SMB_STS_ALRM 0x40
84 #define NVIDIA_SMB_STS_RES 0x20
85 #define NVIDIA_SMB_STS_STATUS 0x1f
87 #define NVIDIA_SMB_PRTCL_WRITE 0x00
88 #define NVIDIA_SMB_PRTCL_READ 0x01
89 #define NVIDIA_SMB_PRTCL_QUICK 0x02
90 #define NVIDIA_SMB_PRTCL_BYTE 0x04
91 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
92 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
93 #define NVIDIA_SMB_PRTCL_PEC 0x80
95 static struct pci_driver nforce2_driver;
97 /* Return -1 on error */
98 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
99 unsigned short flags, char read_write,
100 u8 command, int size, union i2c_smbus_data * data)
102 struct nforce2_smbus *smbus = adap->algo_data;
103 unsigned char protocol, pec, temp;
105 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
106 NVIDIA_SMB_PRTCL_WRITE;
107 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
111 case I2C_SMBUS_QUICK:
112 protocol |= NVIDIA_SMB_PRTCL_QUICK;
113 read_write = I2C_SMBUS_WRITE;
117 if (read_write == I2C_SMBUS_WRITE)
118 outb_p(command, NVIDIA_SMB_CMD);
119 protocol |= NVIDIA_SMB_PRTCL_BYTE;
122 case I2C_SMBUS_BYTE_DATA:
123 outb_p(command, NVIDIA_SMB_CMD);
124 if (read_write == I2C_SMBUS_WRITE)
125 outb_p(data->byte, NVIDIA_SMB_DATA);
126 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
129 case I2C_SMBUS_WORD_DATA:
130 outb_p(command, NVIDIA_SMB_CMD);
131 if (read_write == I2C_SMBUS_WRITE) {
132 outb_p(data->word, NVIDIA_SMB_DATA);
133 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
135 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
139 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
143 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
144 outb_p(protocol, NVIDIA_SMB_PRTCL);
146 temp = inb_p(NVIDIA_SMB_STS);
148 if (~temp & NVIDIA_SMB_STS_DONE) {
150 temp = inb_p(NVIDIA_SMB_STS);
152 if (~temp & NVIDIA_SMB_STS_DONE) {
154 temp = inb_p(NVIDIA_SMB_STS);
157 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
158 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
162 if (read_write == I2C_SMBUS_WRITE)
168 case I2C_SMBUS_BYTE_DATA:
169 data->byte = inb_p(NVIDIA_SMB_DATA);
172 case I2C_SMBUS_WORD_DATA:
173 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
181 static u32 nforce2_func(struct i2c_adapter *adapter)
183 /* other functionality might be possible, but is not tested */
184 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
185 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA;
188 static struct i2c_algorithm smbus_algorithm = {
189 .smbus_xfer = nforce2_access,
190 .functionality = nforce2_func,
194 static struct pci_device_id nforce2_ids[] = {
195 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
196 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
197 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
198 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
199 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
200 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
201 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
202 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
206 MODULE_DEVICE_TABLE (pci, nforce2_ids);
209 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
210 int alt_reg, struct nforce2_smbus *smbus, const char *name)
214 smbus->base = pci_resource_start(dev, bar);
216 smbus->size = pci_resource_len(dev, bar);
218 /* Older incarnations of the device used non-standard BARs */
221 if (pci_read_config_word(dev, alt_reg, &iobase)
222 != PCIBIOS_SUCCESSFUL) {
223 dev_err(&dev->dev, "Error reading PCI config for %s\n",
228 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
232 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
233 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
234 smbus->base, smbus->base+smbus->size-1, name);
237 smbus->adapter.owner = THIS_MODULE;
238 smbus->adapter.id = I2C_HW_SMBUS_NFORCE2;
239 smbus->adapter.class = I2C_CLASS_HWMON;
240 smbus->adapter.algo = &smbus_algorithm;
241 smbus->adapter.algo_data = smbus;
242 smbus->adapter.dev.parent = &dev->dev;
243 snprintf(smbus->adapter.name, I2C_NAME_SIZE,
244 "SMBus nForce2 adapter at %04x", smbus->base);
246 error = i2c_add_adapter(&smbus->adapter);
248 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
249 release_region(smbus->base, smbus->size);
252 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
257 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
259 struct nforce2_smbus *smbuses;
262 /* we support 2 SMBus adapters */
263 if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
265 pci_set_drvdata(dev, smbuses);
267 /* SMBus adapter 1 */
268 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
270 dev_err(&dev->dev, "Error probing SMB1.\n");
271 smbuses[0].base = 0; /* to have a check value */
273 /* SMBus adapter 2 */
274 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
276 dev_err(&dev->dev, "Error probing SMB2.\n");
277 smbuses[1].base = 0; /* to have a check value */
279 if ((res1 < 0) && (res2 < 0)) {
280 /* we did not find even one of the SMBuses, so we give up */
289 static void __devexit nforce2_remove(struct pci_dev *dev)
291 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
293 if (smbuses[0].base) {
294 i2c_del_adapter(&smbuses[0].adapter);
295 release_region(smbuses[0].base, smbuses[0].size);
297 if (smbuses[1].base) {
298 i2c_del_adapter(&smbuses[1].adapter);
299 release_region(smbuses[1].base, smbuses[1].size);
304 static struct pci_driver nforce2_driver = {
305 .name = "nForce2_smbus",
306 .id_table = nforce2_ids,
307 .probe = nforce2_probe,
308 .remove = __devexit_p(nforce2_remove),
311 static int __init nforce2_init(void)
313 return pci_register_driver(&nforce2_driver);
316 static void __exit nforce2_exit(void)
318 pci_unregister_driver(&nforce2_driver);
321 module_init(nforce2_init);
322 module_exit(nforce2_exit);