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.
23 SUPPORTED DEVICES PCI ID
25 nForce2 Ultra 400 MCP 0084
26 nForce3 Pro150 MCP 00D4
27 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/i2c.h>
51 #include <linux/delay.h>
52 #include <linux/dmi.h>
53 #include <linux/acpi.h>
54 #include <linux/slab.h>
57 MODULE_LICENSE("GPL");
58 MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
59 MODULE_DESCRIPTION("nForce2/3/4/5xx SMBus driver");
62 struct nforce2_smbus {
63 struct i2c_adapter adapter;
72 * nVidia nForce2 SMBus control register definitions
73 * (Newer incarnations use standard BARs 4 and 5 instead)
75 #define NFORCE_PCI_SMB1 0x50
76 #define NFORCE_PCI_SMB2 0x54
80 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
82 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
83 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
84 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
85 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
86 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
87 #define NVIDIA_SMB_BCNT (smbus->base + 0x24) /* number of data
89 #define NVIDIA_SMB_STATUS_ABRT (smbus->base + 0x3c) /* register used to
92 #define NVIDIA_SMB_CTRL (smbus->base + 0x3e) /* control register */
94 #define NVIDIA_SMB_STATUS_ABRT_STS 0x01 /* Bit to notify that
96 #define NVIDIA_SMB_CTRL_ABORT 0x20
97 #define NVIDIA_SMB_STS_DONE 0x80
98 #define NVIDIA_SMB_STS_ALRM 0x40
99 #define NVIDIA_SMB_STS_RES 0x20
100 #define NVIDIA_SMB_STS_STATUS 0x1f
102 #define NVIDIA_SMB_PRTCL_WRITE 0x00
103 #define NVIDIA_SMB_PRTCL_READ 0x01
104 #define NVIDIA_SMB_PRTCL_QUICK 0x02
105 #define NVIDIA_SMB_PRTCL_BYTE 0x04
106 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
107 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
108 #define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a
109 #define NVIDIA_SMB_PRTCL_PEC 0x80
111 /* Misc definitions */
112 #define MAX_TIMEOUT 100
114 /* We disable the second SMBus channel on these boards */
115 static const struct dmi_system_id nforce2_dmi_blacklist2[] = {
117 .ident = "DFI Lanparty NF4 Expert",
119 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"),
120 DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"),
126 static struct pci_driver nforce2_driver;
128 /* For multiplexing support, we need a global reference to the 1st
130 #if defined CONFIG_I2C_NFORCE2_S4985 || defined CONFIG_I2C_NFORCE2_S4985_MODULE
131 struct i2c_adapter *nforce2_smbus;
132 EXPORT_SYMBOL_GPL(nforce2_smbus);
134 static void nforce2_set_reference(struct i2c_adapter *adap)
136 nforce2_smbus = adap;
139 static inline void nforce2_set_reference(struct i2c_adapter *adap) { }
142 static void nforce2_abort(struct i2c_adapter *adap)
144 struct nforce2_smbus *smbus = adap->algo_data;
148 dev_dbg(&adap->dev, "Aborting current transaction\n");
150 outb_p(NVIDIA_SMB_CTRL_ABORT, NVIDIA_SMB_CTRL);
153 temp = inb_p(NVIDIA_SMB_STATUS_ABRT);
154 } while (!(temp & NVIDIA_SMB_STATUS_ABRT_STS) &&
155 (timeout++ < MAX_TIMEOUT));
156 if (!(temp & NVIDIA_SMB_STATUS_ABRT_STS))
157 dev_err(&adap->dev, "Can't reset the smbus\n");
158 outb_p(NVIDIA_SMB_STATUS_ABRT_STS, NVIDIA_SMB_STATUS_ABRT);
161 static int nforce2_check_status(struct i2c_adapter *adap)
163 struct nforce2_smbus *smbus = adap->algo_data;
169 temp = inb_p(NVIDIA_SMB_STS);
170 } while ((!temp) && (timeout++ < MAX_TIMEOUT));
172 if (timeout > MAX_TIMEOUT) {
173 dev_dbg(&adap->dev, "SMBus Timeout!\n");
174 if (smbus->can_abort)
178 if (!(temp & NVIDIA_SMB_STS_DONE) || (temp & NVIDIA_SMB_STS_STATUS)) {
179 dev_dbg(&adap->dev, "Transaction failed (0x%02x)!\n", temp);
185 /* Return negative errno on error */
186 static s32 nforce2_access(struct i2c_adapter *adap, u16 addr,
187 unsigned short flags, char read_write,
188 u8 command, int size, union i2c_smbus_data *data)
190 struct nforce2_smbus *smbus = adap->algo_data;
191 unsigned char protocol, pec;
195 protocol = (read_write == I2C_SMBUS_READ) ? NVIDIA_SMB_PRTCL_READ :
196 NVIDIA_SMB_PRTCL_WRITE;
197 pec = (flags & I2C_CLIENT_PEC) ? NVIDIA_SMB_PRTCL_PEC : 0;
200 case I2C_SMBUS_QUICK:
201 protocol |= NVIDIA_SMB_PRTCL_QUICK;
202 read_write = I2C_SMBUS_WRITE;
206 if (read_write == I2C_SMBUS_WRITE)
207 outb_p(command, NVIDIA_SMB_CMD);
208 protocol |= NVIDIA_SMB_PRTCL_BYTE;
211 case I2C_SMBUS_BYTE_DATA:
212 outb_p(command, NVIDIA_SMB_CMD);
213 if (read_write == I2C_SMBUS_WRITE)
214 outb_p(data->byte, NVIDIA_SMB_DATA);
215 protocol |= NVIDIA_SMB_PRTCL_BYTE_DATA;
218 case I2C_SMBUS_WORD_DATA:
219 outb_p(command, NVIDIA_SMB_CMD);
220 if (read_write == I2C_SMBUS_WRITE) {
221 outb_p(data->word, NVIDIA_SMB_DATA);
222 outb_p(data->word >> 8, NVIDIA_SMB_DATA + 1);
224 protocol |= NVIDIA_SMB_PRTCL_WORD_DATA | pec;
227 case I2C_SMBUS_BLOCK_DATA:
228 outb_p(command, NVIDIA_SMB_CMD);
229 if (read_write == I2C_SMBUS_WRITE) {
230 len = data->block[0];
231 if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
233 "Transaction failed (requested block size: %d)\n",
237 outb_p(len, NVIDIA_SMB_BCNT);
238 for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
239 outb_p(data->block[i + 1],
240 NVIDIA_SMB_DATA + i);
242 protocol |= NVIDIA_SMB_PRTCL_BLOCK_DATA | pec;
246 dev_err(&adap->dev, "Unsupported transaction %d\n", size);
250 outb_p((addr & 0x7f) << 1, NVIDIA_SMB_ADDR);
251 outb_p(protocol, NVIDIA_SMB_PRTCL);
253 status = nforce2_check_status(adap);
257 if (read_write == I2C_SMBUS_WRITE)
262 case I2C_SMBUS_BYTE_DATA:
263 data->byte = inb_p(NVIDIA_SMB_DATA);
266 case I2C_SMBUS_WORD_DATA:
267 data->word = inb_p(NVIDIA_SMB_DATA) |
268 (inb_p(NVIDIA_SMB_DATA + 1) << 8);
271 case I2C_SMBUS_BLOCK_DATA:
272 len = inb_p(NVIDIA_SMB_BCNT);
273 if ((len <= 0) || (len > I2C_SMBUS_BLOCK_MAX)) {
275 "Transaction failed (received block size: 0x%02x)\n",
279 for (i = 0; i < len; i++)
280 data->block[i + 1] = inb_p(NVIDIA_SMB_DATA + i);
281 data->block[0] = len;
289 static u32 nforce2_func(struct i2c_adapter *adapter)
291 /* other functionality might be possible, but is not tested */
292 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
293 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
295 (((struct nforce2_smbus *)adapter->algo_data)->blockops ?
296 I2C_FUNC_SMBUS_BLOCK_DATA : 0);
299 static struct i2c_algorithm smbus_algorithm = {
300 .smbus_xfer = nforce2_access,
301 .functionality = nforce2_func,
305 static const struct pci_device_id nforce2_ids[] = {
306 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS) },
307 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS) },
308 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS) },
309 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS) },
310 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS) },
311 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
312 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
313 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
314 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
315 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
316 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP67_SMBUS) },
317 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS) },
318 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS) },
319 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS) },
323 MODULE_DEVICE_TABLE(pci, nforce2_ids);
326 static int nforce2_probe_smb(struct pci_dev *dev, int bar, int alt_reg,
327 struct nforce2_smbus *smbus, const char *name)
331 smbus->base = pci_resource_start(dev, bar);
333 smbus->size = pci_resource_len(dev, bar);
335 /* Older incarnations of the device used non-standard BARs */
338 if (pci_read_config_word(dev, alt_reg, &iobase)
339 != PCIBIOS_SUCCESSFUL) {
340 dev_err(&dev->dev, "Error reading PCI config for %s\n",
345 smbus->base = iobase & PCI_BASE_ADDRESS_IO_MASK;
349 error = acpi_check_region(smbus->base, smbus->size,
350 nforce2_driver.name);
354 if (!request_region(smbus->base, smbus->size, nforce2_driver.name)) {
355 dev_err(&smbus->adapter.dev, "Error requesting region %02x .. %02X for %s\n",
356 smbus->base, smbus->base+smbus->size-1, name);
359 smbus->adapter.owner = THIS_MODULE;
360 smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
361 smbus->adapter.algo = &smbus_algorithm;
362 smbus->adapter.algo_data = smbus;
363 smbus->adapter.dev.parent = &dev->dev;
364 snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
365 "SMBus nForce2 adapter at %04x", smbus->base);
367 error = i2c_add_adapter(&smbus->adapter);
369 dev_err(&smbus->adapter.dev, "Failed to register adapter.\n");
370 release_region(smbus->base, smbus->size);
373 dev_info(&smbus->adapter.dev, "nForce2 SMBus adapter at %#x\n",
379 static int nforce2_probe(struct pci_dev *dev, const struct pci_device_id *id)
381 struct nforce2_smbus *smbuses;
384 /* we support 2 SMBus adapters */
385 smbuses = kzalloc(2 * sizeof(struct nforce2_smbus), GFP_KERNEL);
388 pci_set_drvdata(dev, smbuses);
390 switch (dev->device) {
391 case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS:
392 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS:
393 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS:
394 smbuses[0].blockops = 1;
395 smbuses[1].blockops = 1;
396 smbuses[0].can_abort = 1;
397 smbuses[1].can_abort = 1;
400 /* SMBus adapter 1 */
401 res1 = nforce2_probe_smb(dev, 4, NFORCE_PCI_SMB1, &smbuses[0], "SMB1");
403 smbuses[0].base = 0; /* to have a check value */
405 /* SMBus adapter 2 */
406 if (dmi_check_system(nforce2_dmi_blacklist2)) {
407 dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
411 res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
414 smbuses[1].base = 0; /* to have a check value */
417 if ((res1 < 0) && (res2 < 0)) {
418 /* we did not find even one of the SMBuses, so we give up */
423 nforce2_set_reference(&smbuses[0].adapter);
428 static void nforce2_remove(struct pci_dev *dev)
430 struct nforce2_smbus *smbuses = pci_get_drvdata(dev);
432 nforce2_set_reference(NULL);
433 if (smbuses[0].base) {
434 i2c_del_adapter(&smbuses[0].adapter);
435 release_region(smbuses[0].base, smbuses[0].size);
437 if (smbuses[1].base) {
438 i2c_del_adapter(&smbuses[1].adapter);
439 release_region(smbuses[1].base, smbuses[1].size);
444 static struct pci_driver nforce2_driver = {
445 .name = "nForce2_smbus",
446 .id_table = nforce2_ids,
447 .probe = nforce2_probe,
448 .remove = nforce2_remove,
451 module_pci_driver(nforce2_driver);