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>
53 #include <linux/dmi.h>
56 MODULE_LICENSE("GPL");
57 MODULE_AUTHOR ("Hans-Frieder Vogt <hfvogt@gmx.net>");
58 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
61 struct nforce2_smbus {
62 struct i2c_adapter adapter;
71 * nVidia nForce2 SMBus control register definitions
72 * (Newer incarnations use standard BARs 4 and 5 instead)
74 #define NFORCE_PCI_SMB1 0x50
75 #define NFORCE_PCI_SMB2 0x54
79 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
81 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
82 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
83 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
84 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
85 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
86 #define NVIDIA_SMB_BCNT (smbus->base + 0x24) /* number of data
88 #define NVIDIA_SMB_STATUS_ABRT (smbus->base + 0x3c) /* register used to
91 #define NVIDIA_SMB_CTRL (smbus->base + 0x3e) /* control register */
93 #define NVIDIA_SMB_STATUS_ABRT_STS 0x01 /* Bit to notify that
95 #define NVIDIA_SMB_CTRL_ABORT 0x20
96 #define NVIDIA_SMB_STS_DONE 0x80
97 #define NVIDIA_SMB_STS_ALRM 0x40
98 #define NVIDIA_SMB_STS_RES 0x20
99 #define NVIDIA_SMB_STS_STATUS 0x1f
101 #define NVIDIA_SMB_PRTCL_WRITE 0x00
102 #define NVIDIA_SMB_PRTCL_READ 0x01
103 #define NVIDIA_SMB_PRTCL_QUICK 0x02
104 #define NVIDIA_SMB_PRTCL_BYTE 0x04
105 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
106 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
107 #define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a
108 #define NVIDIA_SMB_PRTCL_PEC 0x80
110 /* Misc definitions */
111 #define MAX_TIMEOUT 100
113 /* We disable the second SMBus channel on these boards */
114 static struct dmi_system_id __devinitdata nforce2_dmi_blacklist2[] = {
116 .ident = "DFI Lanparty NF4 Expert",
118 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"),
119 DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"),
125 static struct pci_driver nforce2_driver;
127 static void nforce2_abort(struct i2c_adapter *adap)
129 struct nforce2_smbus *smbus = adap->algo_data;
133 dev_dbg(&adap->dev, "Aborting current transaction\n");
135 outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
138 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
139 } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
140 (timeout++ < MAX_TIMEOUT));
141 if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
142 dev_err(&adap->dev, "Can't reset the smbus\n");
143 outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
146 static int nforce2_check_status(struct i2c_adapter *adap)
148 struct nforce2_smbus *smbus = adap->algo_data;
154 temp = inb_p(NVIDIA_SMB_STS);
155 } while ((!temp) && (timeout++ < MAX_TIMEOUT));
157 if (timeout >= MAX_TIMEOUT) {
158 dev_dbg(&adap->dev, "SMBus Timeout!\n");
159 if (smbus->can_abort)
163 if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
164 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
170 /* Return -1 on error */
171 static s32 nforce2_access(struct i2c_adapter * adap, u16 addr,
172 unsigned short flags, char read_write,
173 u8 command, int size, union i2c_smbus_data * data)
175 struct nforce2_smbus *smbus = adap->algo_data;
176 unsigned char protocol, pec;
180 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
181 NVIDIA_SMB_PRTCL_WRITE;
182 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
186 case I2C_SMBUS_QUICK:
187 protocol |= NVIDIA_SMB_PRTCL_QUICK;
188 read_write = I2C_SMBUS_WRITE;
192 if (read_write == I2C_SMBUS_WRITE)
193 outb_p(command, NVIDIA_SMB_CMD);
194 protocol |= NVIDIA_SMB_PRTCL_BYTE;
197 case I2C_SMBUS_BYTE_DATA:
198 outb_p(command, NVIDIA_SMB_CMD);
199 if (read_write == I2C_SMBUS_WRITE)
200 outb_p(data->byte, NVIDIA_SMB_DATA);
201 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
204 case I2C_SMBUS_WORD_DATA:
205 outb_p(command, NVIDIA_SMB_CMD);
206 if (read_write == I2C_SMBUS_WRITE) {
207 outb_p(data->word, NVIDIA_SMB_DATA);
208 outb_p(data->word >> 8, NVIDIA_SMB_DATA+1);
210 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
213 case I2C_SMBUS_BLOCK_DATA:
214 outb_p(command, NVIDIA_SMB_CMD);
215 if (read_write == I2C_SMBUS_WRITE) {
216 len = data->block[0];
217 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
219 "Transaction failed "
220 "(requested block size: %d)\n",
224 outb_p(len, NVIDIA_SMB_BCNT);
225 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
226 outb_p(data->block[i + 1],
229 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
233 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
237 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
238 outb_p(protocol, NVIDIA_SMB_PRTCL);
240 if (nforce2_check_status(adap))
243 if (read_write == I2C_SMBUS_WRITE)
249 case I2C_SMBUS_BYTE_DATA:
250 data->byte = inb_p(NVIDIA_SMB_DATA);
253 case I2C_SMBUS_WORD_DATA:
254 data->word = inb_p(NVIDIA_SMB_DATA) | (inb_p(NVIDIA_SMB_DATA+1) << 8);
257 case I2C_SMBUS_BLOCK_DATA:
258 len = inb_p(NVIDIA_SMB_BCNT);
259 if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
260 dev_err(&adap->dev, "Transaction failed "
261 "(received block size: 0x%02x)\n",
265 for (i = 0; i < len; i++)
266 data->block[i+1] = inb_p(NVIDIA_SMB_DATA + i);
267 data->block[0] = len;
275 static u32 nforce2_func(struct i2c_adapter *adapter)
277 /* other functionality might be possible, but is not tested */
278 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
279 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
281 (((struct nforce2_smbus*)adapter->algo_data)->blockops ?
282 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
285 static struct i2c_algorithm smbus_algorithm = {
286 .smbus_xfer = nforce2_access,
287 .functionality = nforce2_func,
291 static struct pci_device_id nforce2_ids[] = {
292 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
293 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
294 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
295 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
296 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
297 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
298 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
299 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
300 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
301 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
305 MODULE_DEVICE_TABLE (pci, nforce2_ids);
308 static int __devinit nforce2_probe_smb (struct pci_dev *dev, int bar,
309 int alt_reg, struct nforce2_smbus *smbus, const char *name)
313 smbus->base = pci_resource_start(dev, bar);
315 smbus->size = pci_resource_len(dev, bar);
317 /* Older incarnations of the device used non-standard BARs */
320 if (pci_read_config_word(dev, alt_reg, &iobase)
321 != PCIBIOS_SUCCESSFUL) {
322 dev_err(&dev->dev, "Error reading PCI config for %s\n",
327 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
331 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
332 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
333 smbus->base, smbus->base+smbus->size-1, name);
336 smbus->adapter.owner = THIS_MODULE;
337 smbus->adapter.id = I2C_HW_SMBUS_NFORCE2;
338 smbus->adapter.class = I2C_CLASS_HWMON;
339 smbus->adapter.algo = &smbus_algorithm;
340 smbus->adapter.algo_data = smbus;
341 smbus->adapter.dev.parent = &dev->dev;
342 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
343 "SMBus nForce2 adapter at %04x", smbus->base);
345 error = i2c_add_adapter(&smbus->adapter);
347 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
348 release_region(smbus->base, smbus->size);
351 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n", smbus->base);
356 static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
358 struct nforce2_smbus *smbuses;
361 /* we support 2 SMBus adapters */
362 if (!(smbuses = kzalloc(2*sizeof(struct nforce2_smbus), GFP_KERNEL)))
364 pci_set_drvdata(dev, smbuses);
366 switch(dev->device) {
367 case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS:
368 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
369 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
370 smbuses[0].blockops = 1;
371 smbuses[1].blockops = 1;
372 smbuses[0].can_abort = 1;
373 smbuses[1].can_abort = 1;
376 /* SMBus adapter 1 */
377 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
379 dev_err(&dev->dev, "Error probing SMB1.\n");
380 smbuses[0].base = 0; /* to have a check value */
382 /* SMBus adapter 2 */
383 if (dmi_check_system(nforce2_dmi_blacklist2)) {
384 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
388 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
391 dev_err(&dev->dev, "Error probing SMB2.\n");
392 smbuses[1].base = 0; /* to have a check value */
395 if ((res1 < 0) && (res2 < 0)) {
396 /* we did not find even one of the SMBuses, so we give up */
405 static void __devexit nforce2_remove(struct pci_dev *dev)
407 struct nforce2_smbus *smbuses = (void*) pci_get_drvdata(dev);
409 if (smbuses[0].base) {
410 i2c_del_adapter(&smbuses[0].adapter);
411 release_region(smbuses[0].base, smbuses[0].size);
413 if (smbuses[1].base) {
414 i2c_del_adapter(&smbuses[1].adapter);
415 release_region(smbuses[1].base, smbuses[1].size);
420 static struct pci_driver nforce2_driver = {
421 .name = "nForce2_smbus",
422 .id_table = nforce2_ids,
423 .probe = nforce2_probe,
424 .remove = __devexit_p(nforce2_remove),
427 static int __init nforce2_init(void)
429 return pci_register_driver(&nforce2_driver);
432 static void __exit nforce2_exit(void)
434 pci_unregister_driver(&nforce2_driver);
437 module_init(nforce2_init);
438 module_exit(nforce2_exit);