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
39 This driver supports the 2 SMBuses that are included in the MCP of the
40 nForce2/3/4/5xx chipsets.
43 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
45 #include <linux/module.h>
46 #include <linux/pci.h>
47 #include <linux/kernel.h>
48 #include <linux/stddef.h>
49 #include <linux/ioport.h>
50 #include <linux/init.h>
51 #include <linux/i2c.h>
52 #include <linux/delay.h>
55 MODULE_LICENSE("GPL");
56 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");
57 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
60 struct nforce2_smbus {
61 struct i2c_adapter adapter;
68 * nVidia nForce2 SMBus control register definitions
69 * (Newer incarnations use standard BARs 4 and 5 instead)
71 #define NFORCE_PCI_SMB1 0x50
72 #define NFORCE_PCI_SMB2 0x54
76 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
78 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
79 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
80 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
81 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
82 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
84 #define NVIDIA_SMB_STS_DONE 0x80
85 #define NVIDIA_SMB_STS_ALRM 0x40
86 #define NVIDIA_SMB_STS_RES 0x20
87 #define NVIDIA_SMB_STS_STATUS 0x1f
89 #define NVIDIA_SMB_PRTCL_WRITE 0x00
90 #define NVIDIA_SMB_PRTCL_READ 0x01
91 #define NVIDIA_SMB_PRTCL_QUICK 0x02
92 #define NVIDIA_SMB_PRTCL_BYTE 0x04
93 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
94 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
95 #define NVIDIA_SMB_PRTCL_PEC 0x80
97 static struct pci_driver nforce2_driver;
99 /* Return -1 on error */
100 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
101 unsigned short flags, char read_write,
102 u8 command, int size, union i2c_smbus_data * data)
104 struct nforce2_smbus *smbus = adap->algo_data;
105 unsigned char protocol, pec, temp;
107 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
108 NVIDIA_SMB_PRTCL_WRITE;
109 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
113 case I2C_SMBUS_QUICK:
114 protocol |= NVIDIA_SMB_PRTCL_QUICK;
115 read_write = I2C_SMBUS_WRITE;
119 if (read_write == I2C_SMBUS_WRITE)
120 outb_p(command, NVIDIA_SMB_CMD);
121 protocol |= NVIDIA_SMB_PRTCL_BYTE;
124 case I2C_SMBUS_BYTE_DATA:
125 outb_p(command, NVIDIA_SMB_CMD);
126 if (read_write == I2C_SMBUS_WRITE)
127 outb_p(data->byte, NVIDIA_SMB_DATA);
128 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
131 case I2C_SMBUS_WORD_DATA:
132 outb_p(command, NVIDIA_SMB_CMD);
133 if (read_write == I2C_SMBUS_WRITE) {
134 outb_p(data->word, NVIDIA_SMB_DATA);
135 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
137 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
141 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
145 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
146 outb_p(protocol, NVIDIA_SMB_PRTCL);
148 temp = inb_p(NVIDIA_SMB_STS);
150 if (~temp & NVIDIA_SMB_STS_DONE) {
152 temp = inb_p(NVIDIA_SMB_STS);
154 if (~temp & NVIDIA_SMB_STS_DONE) {
156 temp = inb_p(NVIDIA_SMB_STS);
159 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
160 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
164 if (read_write == I2C_SMBUS_WRITE)
170 case I2C_SMBUS_BYTE_DATA:
171 data->byte = inb_p(NVIDIA_SMB_DATA);
174 case I2C_SMBUS_WORD_DATA:
175 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
183 static u32 nforce2_func(struct i2c_adapter *adapter)
185 /* other functionality might be possible, but is not tested */
186 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
187 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA;
190 static struct i2c_algorithm smbus_algorithm = {
191 .smbus_xfer = nforce2_access,
192 .functionality = nforce2_func,
196 static struct pci_device_id nforce2_ids[] = {
197 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
198 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
199 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
200 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
201 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
202 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
203 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
204 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
205 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
206 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
210 MODULE_DEVICE_TABLE (pci, nforce2_ids);
213 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
214 int alt_reg, struct nforce2_smbus *smbus, const char *name)
218 smbus->base = pci_resource_start(dev, bar);
220 smbus->size = pci_resource_len(dev, bar);
222 /* Older incarnations of the device used non-standard BARs */
225 if (pci_read_config_word(dev, alt_reg, &iobase)
226 != PCIBIOS_SUCCESSFUL) {
227 dev_err(&dev->dev, "Error reading PCI config for %s\n",
232 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
236 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
237 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
238 smbus->base, smbus->base+smbus->size-1, name);
241 smbus->adapter.owner = THIS_MODULE;
242 smbus->adapter.id = I2C_HW_SMBUS_NFORCE2;
243 smbus->adapter.class = I2C_CLASS_HWMON;
244 smbus->adapter.algo = &smbus_algorithm;
245 smbus->adapter.algo_data = smbus;
246 smbus->adapter.dev.parent = &dev->dev;
247 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
248 "SMBus nForce2 adapter at %04x", smbus->base);
250 error = i2c_add_adapter(&smbus->adapter);
252 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
253 release_region(smbus->base, smbus->size);
256 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
261 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
263 struct nforce2_smbus *smbuses;
266 /* we support 2 SMBus adapters */
267 if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
269 pci_set_drvdata(dev, smbuses);
271 /* SMBus adapter 1 */
272 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
274 dev_err(&dev->dev, "Error probing SMB1.\n");
275 smbuses[0].base = 0; /* to have a check value */
277 /* SMBus adapter 2 */
278 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
280 dev_err(&dev->dev, "Error probing SMB2.\n");
281 smbuses[1].base = 0; /* to have a check value */
283 if ((res1 < 0) && (res2 < 0)) {
284 /* we did not find even one of the SMBuses, so we give up */
293 static void __devexit nforce2_remove(struct pci_dev *dev)
295 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
297 if (smbuses[0].base) {
298 i2c_del_adapter(&smbuses[0].adapter);
299 release_region(smbuses[0].base, smbuses[0].size);
301 if (smbuses[1].base) {
302 i2c_del_adapter(&smbuses[1].adapter);
303 release_region(smbuses[1].base, smbuses[1].size);
308 static struct pci_driver nforce2_driver = {
309 .name = "nForce2_smbus",
310 .id_table = nforce2_ids,
311 .probe = nforce2_probe,
312 .remove = __devexit_p(nforce2_remove),
315 static int __init nforce2_init(void)
317 return pci_register_driver(&nforce2_driver);
320 static void __exit nforce2_exit(void)
322 pci_unregister_driver(&nforce2_driver);
325 module_init(nforce2_init);
326 module_exit(nforce2_exit);