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
;
70 * nVidia nForce2 SMBus control register definitions
71 * (Newer incarnations use standard BARs 4 and 5 instead)
73 #define NFORCE_PCI_SMB1 0x50
74 #define NFORCE_PCI_SMB2 0x54
78 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
80 #define NVIDIA_SMB_PRTCL (smbus->base + 0x00) /* protocol, PEC */
81 #define NVIDIA_SMB_STS (smbus->base + 0x01) /* status */
82 #define NVIDIA_SMB_ADDR (smbus->base + 0x02) /* address */
83 #define NVIDIA_SMB_CMD (smbus->base + 0x03) /* command */
84 #define NVIDIA_SMB_DATA (smbus->base + 0x04) /* 32 data registers */
85 #define NVIDIA_SMB_BCNT (smbus->base + 0x24) /* number of data
87 #define NVIDIA_SMB_STATUS_ABRT (smbus->base + 0x3c) /* register used to
90 #define NVIDIA_SMB_CTRL (smbus->base + 0x3e) /* control register */
92 #define NVIDIA_SMB_STATUS_ABRT_STS 0x01 /* Bit to notify that
94 #define NVIDIA_SMB_CTRL_ABORT 0x20
95 #define NVIDIA_SMB_STS_DONE 0x80
96 #define NVIDIA_SMB_STS_ALRM 0x40
97 #define NVIDIA_SMB_STS_RES 0x20
98 #define NVIDIA_SMB_STS_STATUS 0x1f
100 #define NVIDIA_SMB_PRTCL_WRITE 0x00
101 #define NVIDIA_SMB_PRTCL_READ 0x01
102 #define NVIDIA_SMB_PRTCL_QUICK 0x02
103 #define NVIDIA_SMB_PRTCL_BYTE 0x04
104 #define NVIDIA_SMB_PRTCL_BYTE_DATA 0x06
105 #define NVIDIA_SMB_PRTCL_WORD_DATA 0x08
106 #define NVIDIA_SMB_PRTCL_BLOCK_DATA 0x0a
107 #define NVIDIA_SMB_PRTCL_PEC 0x80
109 /* Misc definitions */
110 #define MAX_TIMEOUT 100
112 static struct pci_driver nforce2_driver
;
114 static void nforce2_abort(struct i2c_adapter
*adap
)
116 struct nforce2_smbus
*smbus
= adap
->algo_data
;
120 dev_dbg(&adap
->dev
, "Aborting current transaction\n");
122 outb_p(NVIDIA_SMB_CTRL_ABORT
, NVIDIA_SMB_CTRL
);
125 temp
= inb_p(NVIDIA_SMB_STATUS_ABRT
);
126 } while (!(temp
& NVIDIA_SMB_STATUS_ABRT_STS
) &&
127 (timeout
++ < MAX_TIMEOUT
));
128 if (!(temp
& NVIDIA_SMB_STATUS_ABRT_STS
))
129 dev_err(&adap
->dev
, "Can't reset the smbus\n");
130 outb_p(NVIDIA_SMB_STATUS_ABRT_STS
, NVIDIA_SMB_STATUS_ABRT
);
133 static int nforce2_check_status(struct i2c_adapter
*adap
)
135 struct nforce2_smbus
*smbus
= adap
->algo_data
;
141 temp
= inb_p(NVIDIA_SMB_STS
);
142 } while ((!temp
) && (timeout
++ < MAX_TIMEOUT
));
144 if (timeout
>= MAX_TIMEOUT
) {
145 dev_dbg(&adap
->dev
, "SMBus Timeout!\n");
146 if (smbus
->can_abort
)
150 if (!(temp
& NVIDIA_SMB_STS_DONE
) || (temp
& NVIDIA_SMB_STS_STATUS
)) {
151 dev_dbg(&adap
->dev
, "Transaction failed (0x%02x)!\n", temp
);
157 /* Return -1 on error */
158 static s32
nforce2_access(struct i2c_adapter
* adap
, u16 addr
,
159 unsigned short flags
, char read_write
,
160 u8 command
, int size
, union i2c_smbus_data
* data
)
162 struct nforce2_smbus
*smbus
= adap
->algo_data
;
163 unsigned char protocol
, pec
;
167 protocol
= (read_write
== I2C_SMBUS_READ
) ? NVIDIA_SMB_PRTCL_READ
:
168 NVIDIA_SMB_PRTCL_WRITE
;
169 pec
= (flags
& I2C_CLIENT_PEC
) ? NVIDIA_SMB_PRTCL_PEC
: 0;
173 case I2C_SMBUS_QUICK
:
174 protocol
|= NVIDIA_SMB_PRTCL_QUICK
;
175 read_write
= I2C_SMBUS_WRITE
;
179 if (read_write
== I2C_SMBUS_WRITE
)
180 outb_p(command
, NVIDIA_SMB_CMD
);
181 protocol
|= NVIDIA_SMB_PRTCL_BYTE
;
184 case I2C_SMBUS_BYTE_DATA
:
185 outb_p(command
, NVIDIA_SMB_CMD
);
186 if (read_write
== I2C_SMBUS_WRITE
)
187 outb_p(data
->byte
, NVIDIA_SMB_DATA
);
188 protocol
|= NVIDIA_SMB_PRTCL_BYTE_DATA
;
191 case I2C_SMBUS_WORD_DATA
:
192 outb_p(command
, NVIDIA_SMB_CMD
);
193 if (read_write
== I2C_SMBUS_WRITE
) {
194 outb_p(data
->word
, NVIDIA_SMB_DATA
);
195 outb_p(data
->word
>> 8, NVIDIA_SMB_DATA
+1);
197 protocol
|= NVIDIA_SMB_PRTCL_WORD_DATA
| pec
;
200 case I2C_SMBUS_BLOCK_DATA
:
201 outb_p(command
, NVIDIA_SMB_CMD
);
202 if (read_write
== I2C_SMBUS_WRITE
) {
203 len
= data
->block
[0];
204 if ((len
== 0) || (len
> I2C_SMBUS_BLOCK_MAX
)) {
206 "Transaction failed "
207 "(requested block size: %d)\n",
211 outb_p(len
, NVIDIA_SMB_BCNT
);
212 for (i
= 0; i
< I2C_SMBUS_BLOCK_MAX
; i
++)
213 outb_p(data
->block
[i
+ 1],
216 protocol
|= NVIDIA_SMB_PRTCL_BLOCK_DATA
| pec
;
220 dev_err(&adap
->dev
, "Unsupported transaction %d\n", size
);
224 outb_p((addr
& 0x7f) << 1, NVIDIA_SMB_ADDR
);
225 outb_p(protocol
, NVIDIA_SMB_PRTCL
);
227 if (nforce2_check_status(adap
))
230 if (read_write
== I2C_SMBUS_WRITE
)
236 case I2C_SMBUS_BYTE_DATA
:
237 data
->byte
= inb_p(NVIDIA_SMB_DATA
);
240 case I2C_SMBUS_WORD_DATA
:
241 data
->word
= inb_p(NVIDIA_SMB_DATA
) | (inb_p(NVIDIA_SMB_DATA
+1) << 8);
244 case I2C_SMBUS_BLOCK_DATA
:
245 len
= inb_p(NVIDIA_SMB_BCNT
);
246 if ((len
<= 0) || (len
> I2C_SMBUS_BLOCK_MAX
)) {
247 dev_err(&adap
->dev
, "Transaction failed "
248 "(received block size: 0x%02x)\n",
252 for (i
= 0; i
< len
; i
++)
253 data
->block
[i
+1] = inb_p(NVIDIA_SMB_DATA
+ i
);
254 data
->block
[0] = len
;
262 static u32
nforce2_func(struct i2c_adapter
*adapter
)
264 /* other functionality might be possible, but is not tested */
265 return I2C_FUNC_SMBUS_QUICK
| I2C_FUNC_SMBUS_BYTE
|
266 I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_WORD_DATA
|
268 (((struct nforce2_smbus
*)adapter
->algo_data
)->blockops
?
269 I2C_FUNC_SMBUS_BLOCK_DATA
: 0);
272 static struct i2c_algorithm smbus_algorithm
= {
273 .smbus_xfer
= nforce2_access
,
274 .functionality
= nforce2_func
,
278 static struct pci_device_id nforce2_ids
[] = {
279 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS
) },
280 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SMBUS
) },
281 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE3_SMBUS
) },
282 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SMBUS
) },
283 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE4_SMBUS
) },
284 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS
) },
285 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS
) },
286 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS
) },
287 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS
) },
288 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS
) },
292 MODULE_DEVICE_TABLE (pci
, nforce2_ids
);
295 static int __devinit
nforce2_probe_smb (struct pci_dev
*dev
, int bar
,
296 int alt_reg
, struct nforce2_smbus
*smbus
, const char *name
)
300 smbus
->base
= pci_resource_start(dev
, bar
);
302 smbus
->size
= pci_resource_len(dev
, bar
);
304 /* Older incarnations of the device used non-standard BARs */
307 if (pci_read_config_word(dev
, alt_reg
, &iobase
)
308 != PCIBIOS_SUCCESSFUL
) {
309 dev_err(&dev
->dev
, "Error reading PCI config for %s\n",
314 smbus
->base
= iobase
& PCI_BASE_ADDRESS_IO_MASK
;
318 if (!request_region(smbus
->base
, smbus
->size
, nforce2_driver
.name
)) {
319 dev_err(&smbus
->adapter
.dev
, "Error requesting region %02x .. %02X for %s\n",
320 smbus
->base
, smbus
->base
+smbus
->size
-1, name
);
323 smbus
->adapter
.owner
= THIS_MODULE
;
324 smbus
->adapter
.id
= I2C_HW_SMBUS_NFORCE2
;
325 smbus
->adapter
.class = I2C_CLASS_HWMON
;
326 smbus
->adapter
.algo
= &smbus_algorithm
;
327 smbus
->adapter
.algo_data
= smbus
;
328 smbus
->adapter
.dev
.parent
= &dev
->dev
;
329 snprintf(smbus
->adapter
.name
, sizeof(smbus
->adapter
.name
),
330 "SMBus nForce2 adapter at %04x", smbus
->base
);
332 error
= i2c_add_adapter(&smbus
->adapter
);
334 dev_err(&smbus
->adapter
.dev
, "Failed to register adapter.\n");
335 release_region(smbus
->base
, smbus
->size
);
338 dev_info(&smbus
->adapter
.dev
, "nForce2 SMBus adapter at %#x\n", smbus
->base
);
343 static int __devinit
nforce2_probe(struct pci_dev
*dev
, const struct pci_device_id
*id
)
345 struct nforce2_smbus
*smbuses
;
348 /* we support 2 SMBus adapters */
349 if (!(smbuses
= kzalloc(2*sizeof(struct nforce2_smbus
), GFP_KERNEL
)))
351 pci_set_drvdata(dev
, smbuses
);
353 switch(dev
->device
) {
354 case PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS
:
355 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS
:
356 case PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS
:
357 smbuses
[0].blockops
= 1;
358 smbuses
[1].blockops
= 1;
359 smbuses
[0].can_abort
= 1;
360 smbuses
[1].can_abort
= 1;
363 /* SMBus adapter 1 */
364 res1
= nforce2_probe_smb(dev
, 4, NFORCE_PCI_SMB1
, &smbuses
[0], "SMB1");
366 dev_err(&dev
->dev
, "Error probing SMB1.\n");
367 smbuses
[0].base
= 0; /* to have a check value */
369 /* SMBus adapter 2 */
370 res2
= nforce2_probe_smb(dev
, 5, NFORCE_PCI_SMB2
, &smbuses
[1], "SMB2");
372 dev_err(&dev
->dev
, "Error probing SMB2.\n");
373 smbuses
[1].base
= 0; /* to have a check value */
375 if ((res1
< 0) && (res2
< 0)) {
376 /* we did not find even one of the SMBuses, so we give up */
385 static void __devexit
nforce2_remove(struct pci_dev
*dev
)
387 struct nforce2_smbus
*smbuses
= (void*) pci_get_drvdata(dev
);
389 if (smbuses
[0].base
) {
390 i2c_del_adapter(&smbuses
[0].adapter
);
391 release_region(smbuses
[0].base
, smbuses
[0].size
);
393 if (smbuses
[1].base
) {
394 i2c_del_adapter(&smbuses
[1].adapter
);
395 release_region(smbuses
[1].base
, smbuses
[1].size
);
400 static struct pci_driver nforce2_driver
= {
401 .name
= "nForce2_smbus",
402 .id_table
= nforce2_ids
,
403 .probe
= nforce2_probe
,
404 .remove
= __devexit_p(nforce2_remove
),
407 static int __init
nforce2_init(void)
409 return pci_register_driver(&nforce2_driver
);
412 static void __exit
nforce2_exit(void)
414 pci_unregister_driver(&nforce2_driver
);
417 module_init(nforce2_init
);
418 module_exit(nforce2_exit
);