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
102 #define MAX_TIMEOUT 256
106 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
107 unsigned short flags, char read_write,
108 u8 command, int size, union i2c_smbus_data *data);
109 static u32 nforce2_func(struct i2c_adapter *adapter);
112 static struct i2c_algorithm smbus_algorithm = {
113 .name = "Non-I2C SMBus adapter",
114 .id = I2C_ALGO_SMBUS,
115 .smbus_xfer = nforce2_access,
116 .functionality = nforce2_func,
119 static struct i2c_adapter nforce2_adapter = {
120 .owner = THIS_MODULE,
121 .class = I2C_CLASS_HWMON,
122 .algo = &smbus_algorithm,
126 /* Return -1 on error. See smbus.h for more information */
127 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
128 unsigned short flags, char read_write,
129 u8 command, int size, union i2c_smbus_data * data)
131 struct nforce2_smbus *smbus = adap->algo_data;
132 unsigned char protocol, pec, temp;
133 unsigned char len = 0; /* to keep the compiler quiet */
137 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
138 NVIDIA_SMB_PRTCL_WRITE;
139 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
143 case I2C_SMBUS_QUICK:
144 protocol |= NVIDIA_SMB_PRTCL_QUICK;
145 read_write = I2C_SMBUS_WRITE;
149 if (read_write == I2C_SMBUS_WRITE)
150 outb_p(command, NVIDIA_SMB_CMD);
151 protocol |= NVIDIA_SMB_PRTCL_BYTE;
154 case I2C_SMBUS_BYTE_DATA:
155 outb_p(command, NVIDIA_SMB_CMD);
156 if (read_write == I2C_SMBUS_WRITE)
157 outb_p(data->byte, NVIDIA_SMB_DATA);
158 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
161 case I2C_SMBUS_WORD_DATA:
162 outb_p(command, NVIDIA_SMB_CMD);
163 if (read_write == I2C_SMBUS_WRITE) {
164 outb_p(data->word, NVIDIA_SMB_DATA);
165 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
167 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
170 case I2C_SMBUS_BLOCK_DATA:
171 outb_p(command, NVIDIA_SMB_CMD);
172 if (read_write == I2C_SMBUS_WRITE) {
173 len = min_t(u8, data->block[0], 32);
174 outb_p(len, NVIDIA_SMB_BCNT);
175 for (i = 0; i < len; i++)
176 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
178 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
181 case I2C_SMBUS_I2C_BLOCK_DATA:
182 len = min_t(u8, data->block[0], 32);
183 outb_p(command, NVIDIA_SMB_CMD);
184 outb_p(len, NVIDIA_SMB_BCNT);
185 if (read_write == I2C_SMBUS_WRITE)
186 for (i = 0; i < len; i++)
187 outb_p(data->block[i + 1], NVIDIA_SMB_DATA+i);
188 protocol |= NVIDIA_SMB_PRTCL_I2C_BLOCK_DATA;
191 case I2C_SMBUS_PROC_CALL:
192 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
195 outb_p(command, NVIDIA_SMB_CMD);
196 outb_p(data->word, NVIDIA_SMB_DATA);
197 outb_p(data->word >> 8, NVIDIA_SMB_DATA + 1);
198 protocol = NVIDIA_SMB_PRTCL_PROC_CALL | pec;
199 read_write = I2C_SMBUS_READ;
203 case I2C_SMBUS_BLOCK_PROC_CALL:
204 dev_err(&adap->dev, "I2C_SMBUS_BLOCK_PROC_CALL not supported!\n");
208 len = min_t(u8, data->block[0], 31);
209 outb_p(command, NVIDIA_SMB_CMD);
210 outb_p(len, NVIDIA_SMB_BCNT);
211 for (i = 0; i < len; i++)
212 outb_p(data->block[i + 1], NVIDIA_SMB_DATA + i);
213 protocol = NVIDIA_SMB_PRTCL_BLOCK_PROC_CALL | pec;
214 read_write = I2C_SMBUS_READ;
218 case I2C_SMBUS_WORD_DATA_PEC:
219 case I2C_SMBUS_BLOCK_DATA_PEC:
220 case I2C_SMBUS_PROC_CALL_PEC:
221 case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
222 dev_err(&adap->dev, "Unexpected software PEC transaction %d\n.", size);
226 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
230 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
231 outb_p(protocol, NVIDIA_SMB_PRTCL);
233 temp = inb_p(NVIDIA_SMB_STS);
238 temp = inb_p(NVIDIA_SMB_STS);
239 } while (((temp & NVIDIA_SMB_STS_DONE) == 0) && (timeout++ < MAX_TIMEOUT));
241 if (~temp & NVIDIA_SMB_STS_DONE) {
243 temp = inb_p(NVIDIA_SMB_STS);
245 if (~temp & NVIDIA_SMB_STS_DONE) {
247 temp = inb_p(NVIDIA_SMB_STS);
250 if ((timeout >= MAX_TIMEOUT) || (~temp & NVIDIA_SMB_STS_DONE)
251 || (temp & NVIDIA_SMB_STS_STATUS))
254 if (read_write == I2C_SMBUS_WRITE)
260 case I2C_SMBUS_BYTE_DATA:
261 data->byte = inb_p(NVIDIA_SMB_DATA);
264 case I2C_SMBUS_WORD_DATA:
265 /* case I2C_SMBUS_PROC_CALL: not supported */
266 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
269 case I2C_SMBUS_BLOCK_DATA:
270 /* case I2C_SMBUS_BLOCK_PROC_CALL: not supported */
271 len = inb_p(NVIDIA_SMB_BCNT);
272 len = min_t(u8, len, 32);
273 case I2C_SMBUS_I2C_BLOCK_DATA:
274 for (i = 0; i < len; i++)
275 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
276 data->block[0] = len;
284 static u32 nforce2_func(struct i2c_adapter *adapter)
286 /* other functionality might be possible, but is not tested */
287 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
288 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA /* |
289 I2C_FUNC_SMBUS_BLOCK_DATA */;
293 static struct pci_device_id nforce2_ids[] = {
294 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
295 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
296 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
297 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
298 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
303 MODULE_DEVICE_TABLE (pci, nforce2_ids);
306 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int reg,
307 struct nforce2_smbus *smbus, char *name)
312 if (pci_read_config_word(dev, reg, &iobase) != PCIBIOS_SUCCESSFUL) {
313 dev_err(&smbus->adapter.dev, "Error reading PCI config for %s\n", name);
317 smbus->base = iobase & 0xfffc;
320 if (!request_region(smbus->base, smbus->size, "nForce2 SMBus")) {
321 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
322 smbus->base, smbus->base+smbus->size-1, name);
325 smbus->adapter = nforce2_adapter;
326 smbus->adapter.algo_data = smbus;
327 smbus->adapter.dev.parent = &dev->dev;
328 snprintf(smbus->adapter.name, I2C_NAME_SIZE,
329 "SMBus nForce2 adapter at %04x", smbus->base);
331 error = i2c_add_adapter(&smbus->adapter);
333 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
334 release_region(smbus->base, smbus->size);
337 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
342 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
344 struct nforce2_smbus *smbuses;
347 /* we support 2 SMBus adapters */
348 if (!(smbuses = (void *)kmalloc(2*sizeof(struct nforce2_smbus),
351 memset (smbuses, 0, 2*sizeof(struct nforce2_smbus));
352 pci_set_drvdata(dev, smbuses);
354 /* SMBus adapter 1 */
355 res1 = nforce2_probe_smb (dev, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
357 dev_err(&dev->dev, "Error probing SMB1.\n");
358 smbuses[0].base = 0; /* to have a check value */
360 res2 = nforce2_probe_smb (dev, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
362 dev_err(&dev->dev, "Error probing SMB2.\n");
363 smbuses[1].base = 0; /* to have a check value */
365 if ((res1 < 0) && (res2 < 0)) {
366 /* we did not find even one of the SMBuses, so we give up */
375 static void __devexit nforce2_remove(struct pci_dev *dev)
377 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
379 if (smbuses[0].base) {
380 i2c_del_adapter(&smbuses[0].adapter);
381 release_region(smbuses[0].base, smbuses[0].size);
383 if (smbuses[1].base) {
384 i2c_del_adapter(&smbuses[1].adapter);
385 release_region(smbuses[1].base, smbuses[1].size);
390 static struct pci_driver nforce2_driver = {
391 .name = "nForce2_smbus",
392 .id_table = nforce2_ids,
393 .probe = nforce2_probe,
394 .remove = __devexit_p(nforce2_remove),
397 static int __init nforce2_init(void)
399 return pci_register_driver(&nforce2_driver);
402 static void __exit nforce2_exit(void)
404 pci_unregister_driver(&nforce2_driver);
407 module_init(nforce2_init);
408 module_exit(nforce2_exit);