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
34 This driver supports the 2 SMBuses that are included in the MCP of the
38 /* Note: we assume there can only be one nForce2, with two SMBus interfaces */
40 #include <linux/module.h>
41 #include <linux/pci.h>
42 #include <linux/kernel.h>
43 #include <linux/stddef.h>
44 #include <linux/sched.h>
45 #include <linux/ioport.h>
46 #include <linux/init.h>
47 #include <linux/i2c.h>
48 #include <linux/delay.h>
51 MODULE_LICENSE("GPL");
52 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@arcor.de>");
53 MODULE_DESCRIPTION("nForce2 SMBus driver");
56 struct nforce2_smbus {
58 struct i2c_adapter adapter;
65 * nVidia nForce2 SMBus control register definitions
67 #define NFORCE_PCI_SMB1 0x50
68 #define NFORCE_PCI_SMB2 0x54
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 bytes */
80 #define NVIDIA_SMB_ALRM_A (smbus->base + 0x25) /* alarm address */
81 #define NVIDIA_SMB_ALRM_D (smbus->base + 0x26) /* 2 bytes alarm data */
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_BLOCK_DATA 0x0a
95 #define NVIDIA_SMB_PRTCL_PROC_CALL 0x0c
96 #define NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
97 #define NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
98 #define NVIDIA_SMB_PRTCL_PEC 0x80
101 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
102 unsigned short flags, char read_write,
103 u8 command, int size, union i2c_smbus_data *data);
104 static u32 nforce2_func(struct i2c_adapter *adapter);
107 static struct i2c_algorithm smbus_algorithm = {
108 .smbus_xfer = nforce2_access,
109 .functionality = nforce2_func,
112 static struct i2c_adapter nforce2_adapter = {
113 .owner = THIS_MODULE,
114 .class = I2C_CLASS_HWMON,
115 .algo = &smbus_algorithm,
119 /* Return -1 on error. See smbus.h for more information */
120 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
121 unsigned short flags, char read_write,
122 u8 command, int size, union i2c_smbus_data * data)
124 struct nforce2_smbus *smbus = adap->algo_data;
125 unsigned char protocol, pec, temp;
126 unsigned char len = 0; /* to keep the compiler quiet */
129 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
130 NVIDIA_SMB_PRTCL_WRITE;
131 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
135 case I2C_SMBUS_QUICK:
136 protocol |= NVIDIA_SMB_PRTCL_QUICK;
137 read_write = I2C_SMBUS_WRITE;
141 if (read_write == I2C_SMBUS_WRITE)
142 outb_p(command, NVIDIA_SMB_CMD);
143 protocol |= NVIDIA_SMB_PRTCL_BYTE;
146 case I2C_SMBUS_BYTE_DATA:
147 outb_p(command, NVIDIA_SMB_CMD);
148 if (read_write == I2C_SMBUS_WRITE)
149 outb_p(data->byte, NVIDIA_SMB_DATA);
150 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
153 case I2C_SMBUS_WORD_DATA:
154 outb_p(command, NVIDIA_SMB_CMD);
155 if (read_write == I2C_SMBUS_WRITE) {
156 outb_p(data->word, NVIDIA_SMB_DATA);
157 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
159 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
162 case I2C_SMBUS_BLOCK_DATA:
163 outb_p(command, NVIDIA_SMB_CMD);
164 if (read_write == I2C_SMBUS_WRITE) {
165 len = min_t(u8, data->block[0], 32);
166 outb_p(len, NVIDIA_SMB_BCNT);
167 for (i = 0; i < len; i++)
168 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
170 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
173 case I2C_SMBUS_I2C_BLOCK_DATA:
174 len = min_t(u8, data->block[0], 32);
175 outb_p(command, NVIDIA_SMB_CMD);
176 outb_p(len, NVIDIA_SMB_BCNT);
177 if (read_write == I2C_SMBUS_WRITE)
178 for (i = 0; i < len; i++)
179 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
180 protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;
183 case I2C_SMBUS_PROC_CALL:
184 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
187 case I2C_SMBUS_BLOCK_PROC_CALL:
188 dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");
191 case I2C_SMBUS_WORD_DATA_PEC:
192 case I2C_SMBUS_BLOCK_DATA_PEC:
193 case I2C_SMBUS_PROC_CALL_PEC:
194 case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
195 dev_err(&adap->dev, "Unexpected software PEC transaction %d\n.", size);
199 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
203 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
204 outb_p(protocol, NVIDIA_SMB_PRTCL);
206 temp = inb_p(NVIDIA_SMB_STS);
208 if (~temp & NVIDIA_SMB_STS_DONE) {
210 temp = inb_p(NVIDIA_SMB_STS);
212 if (~temp & NVIDIA_SMB_STS_DONE) {
214 temp = inb_p(NVIDIA_SMB_STS);
217 if ((~temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
218 dev_dbg(&adap->dev, "SMBus Timeout! (0x%02x)\n", temp);
222 if (read_write == I2C_SMBUS_WRITE)
228 case I2C_SMBUS_BYTE_DATA:
229 data->byte = inb_p(NVIDIA_SMB_DATA);
232 case I2C_SMBUS_WORD_DATA:
233 /* case I2C_SMBUS_PROC_CALL: not supported */
234 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
237 case I2C_SMBUS_BLOCK_DATA:
238 /* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */
239 len = inb_p(NVIDIA_SMB_BCNT);
240 len = min_t(u8, len, 32);
241 case I2C_SMBUS_I2C_BLOCK_DATA:
242 for (i = 0; i < len; i++)
243 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
244 data->block[0] = len;
252 static u32 nforce2_func(struct i2c_adapter *adapter)
254 /* other functionality might be possible, but is not tested */
255 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
256 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA /* |
257 I2C_FUNC_SMBUS_BLOCK_DATA */;
261 static struct pci_device_id nforce2_ids[] = {
262 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
263 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
264 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
265 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
266 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
271 MODULE_DEVICE_TABLE (pci, nforce2_ids);
274 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
275 struct nforce2_smbus *smbus, char *name)
280 if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
281 dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
285 smbus->base = iobase & 0xfffc;
288 if (!request_region(smbus->base, smbus->size, "nForce2 SMBus")) {
289 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
290 smbus->base, smbus->base+smbus->size-1, name);
293 smbus->adapter = nforce2_adapter;
294 smbus->adapter.algo_data = smbus;
295 smbus->adapter.dev.parent = &dev->dev;
296 snprintf(smbus->adapter.name, I2C_NAME_SIZE,
297 "SMBus nForce2 adapter at %04x", smbus->base);
299 error = i2c_add_adapter(&smbus->adapter);
301 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
302 release_region(smbus->base, smbus->size);
305 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
310 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
312 struct nforce2_smbus *smbuses;
315 /* we support 2 SMBus adapters */
316 if (!(smbuses = (void *)kmalloc(2*sizeof(struct nforce2_smbus),
319 memset (smbuses, 0, 2*sizeof(struct nforce2_smbus));
320 pci_set_drvdata(dev, smbuses);
322 /* SMBus adapter 1 */
323 res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
325 dev_err(&dev->dev, "Error probing SMB1.\n");
326 smbuses[0].base = 0; /* to have a check value */
328 res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
330 dev_err(&dev->dev, "Error probing SMB2.\n");
331 smbuses[1].base = 0; /* to have a check value */
333 if ((res1 < 0) && (res2 < 0)) {
334 /* we did not find even one of the SMBuses, so we give up */
343 static void __devexit nforce2_remove(struct pci_dev *dev)
345 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
347 if (smbuses[0].base) {
348 i2c_del_adapter(&smbuses[0].adapter);
349 release_region(smbuses[0].base, smbuses[0].size);
351 if (smbuses[1].base) {
352 i2c_del_adapter(&smbuses[1].adapter);
353 release_region(smbuses[1].base, smbuses[1].size);
358 static struct pci_driver nforce2_driver = {
359 .name = "nForce2_smbus",
360 .id_table = nforce2_ids,
361 .probe = nforce2_probe,
362 .remove = __devexit_p(nforce2_remove),
365 static int __init nforce2_init(void)
367 return pci_register_driver(&nforce2_driver);
370 static void __exit nforce2_exit(void)
372 pci_unregister_driver(&nforce2_driver);
375 module_init(nforce2_init);
376 module_exit(nforce2_exit);