2 Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
4 Shamelessly ripped from i2c-piix4.c:
6 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
7 Philip Edelbrock <phil@netroedge.com>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 2002-04-08: Added nForce support. (Csaba Halasz)
26 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
27 2002-12-28: Rewritten into something that resembles a Linux driver (hch)
28 2003-11-29: Added back AMD8111 removed by the previous rewrite.
33 Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
34 Note: we assume there can only be one device, with one SMBus interface.
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/kernel.h>
40 #include <linux/delay.h>
41 #include <linux/stddef.h>
42 #include <linux/ioport.h>
43 #include <linux/i2c.h>
44 #include <linux/init.h>
45 #include <linux/acpi.h>
48 /* AMD756 SMBus address offsets */
49 #define SMB_ADDR_OFFSET 0xE0
51 #define SMB_GLOBAL_STATUS (0x0 + amd756_ioport)
52 #define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport)
53 #define SMB_HOST_ADDRESS (0x4 + amd756_ioport)
54 #define SMB_HOST_DATA (0x6 + amd756_ioport)
55 #define SMB_HOST_COMMAND (0x8 + amd756_ioport)
56 #define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport)
57 #define SMB_HAS_DATA (0xA + amd756_ioport)
58 #define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport)
59 #define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport)
60 #define SMB_SNOOP_ADDRESS (0xF + amd756_ioport)
62 /* PCI Address Constants */
64 /* address of I/O space */
65 #define SMBBA 0x058 /* mh */
66 #define SMBBANFORCE 0x014
68 /* general configuration */
69 #define SMBGCFG 0x041 /* mh */
71 /* silicon revision code */
75 #define MAX_TIMEOUT 500
77 /* AMD756 constants */
78 #define AMD756_QUICK 0x00
79 #define AMD756_BYTE 0x01
80 #define AMD756_BYTE_DATA 0x02
81 #define AMD756_WORD_DATA 0x03
82 #define AMD756_PROCESS_CALL 0x04
83 #define AMD756_BLOCK_DATA 0x05
85 static struct pci_driver amd756_driver
;
86 static unsigned short amd756_ioport
;
89 SMBUS event = I/O 28-29 bit 11
90 see E0 for the status bits and enabled in E2
93 #define GS_ABRT_STS (1 << 0)
94 #define GS_COL_STS (1 << 1)
95 #define GS_PRERR_STS (1 << 2)
96 #define GS_HST_STS (1 << 3)
97 #define GS_HCYC_STS (1 << 4)
98 #define GS_TO_STS (1 << 5)
99 #define GS_SMB_STS (1 << 11)
101 #define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
102 GS_HCYC_STS | GS_TO_STS )
104 #define GE_CYC_TYPE_MASK (7)
105 #define GE_HOST_STC (1 << 3)
106 #define GE_ABORT (1 << 5)
109 static int amd756_transaction(struct i2c_adapter
*adap
)
115 dev_dbg(&adap
->dev
, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
116 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS
),
117 inw_p(SMB_GLOBAL_ENABLE
), inw_p(SMB_HOST_ADDRESS
),
118 inb_p(SMB_HOST_DATA
));
120 /* Make sure the SMBus host is ready to start transmitting */
121 if ((temp
= inw_p(SMB_GLOBAL_STATUS
)) & (GS_HST_STS
| GS_SMB_STS
)) {
122 dev_dbg(&adap
->dev
, "SMBus busy (%04x). Waiting...\n", temp
);
125 temp
= inw_p(SMB_GLOBAL_STATUS
);
126 } while ((temp
& (GS_HST_STS
| GS_SMB_STS
)) &&
127 (timeout
++ < MAX_TIMEOUT
));
128 /* If the SMBus is still busy, we give up */
129 if (timeout
> MAX_TIMEOUT
) {
130 dev_dbg(&adap
->dev
, "Busy wait timeout (%04x)\n", temp
);
136 /* start the transaction by setting the start bit */
137 outw_p(inw(SMB_GLOBAL_ENABLE
) | GE_HOST_STC
, SMB_GLOBAL_ENABLE
);
139 /* We will always wait for a fraction of a second! */
142 temp
= inw_p(SMB_GLOBAL_STATUS
);
143 } while ((temp
& GS_HST_STS
) && (timeout
++ < MAX_TIMEOUT
));
145 /* If the SMBus is still busy, we give up */
146 if (timeout
> MAX_TIMEOUT
) {
147 dev_dbg(&adap
->dev
, "Completion timeout!\n");
151 if (temp
& GS_PRERR_STS
) {
153 dev_dbg(&adap
->dev
, "SMBus Protocol error (no response)!\n");
156 if (temp
& GS_COL_STS
) {
158 dev_warn(&adap
->dev
, "SMBus collision!\n");
161 if (temp
& GS_TO_STS
) {
163 dev_dbg(&adap
->dev
, "SMBus protocol timeout!\n");
166 if (temp
& GS_HCYC_STS
)
167 dev_dbg(&adap
->dev
, "SMBus protocol success!\n");
169 outw_p(GS_CLEAR_STS
, SMB_GLOBAL_STATUS
);
172 if (((temp
= inw_p(SMB_GLOBAL_STATUS
)) & GS_CLEAR_STS
) != 0x00) {
174 "Failed reset at end of transaction (%04x)\n", temp
);
179 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
180 inw_p(SMB_GLOBAL_STATUS
), inw_p(SMB_GLOBAL_ENABLE
),
181 inw_p(SMB_HOST_ADDRESS
), inb_p(SMB_HOST_DATA
));
186 dev_warn(&adap
->dev
, "Sending abort\n");
187 outw_p(inw(SMB_GLOBAL_ENABLE
) | GE_ABORT
, SMB_GLOBAL_ENABLE
);
189 outw_p(GS_CLEAR_STS
, SMB_GLOBAL_STATUS
);
193 /* Return negative errno on error. */
194 static s32
amd756_access(struct i2c_adapter
* adap
, u16 addr
,
195 unsigned short flags
, char read_write
,
196 u8 command
, int size
, union i2c_smbus_data
* data
)
202 case I2C_SMBUS_QUICK
:
203 outw_p(((addr
& 0x7f) << 1) | (read_write
& 0x01),
208 outw_p(((addr
& 0x7f) << 1) | (read_write
& 0x01),
210 if (read_write
== I2C_SMBUS_WRITE
)
211 outb_p(command
, SMB_HOST_DATA
);
214 case I2C_SMBUS_BYTE_DATA
:
215 outw_p(((addr
& 0x7f) << 1) | (read_write
& 0x01),
217 outb_p(command
, SMB_HOST_COMMAND
);
218 if (read_write
== I2C_SMBUS_WRITE
)
219 outw_p(data
->byte
, SMB_HOST_DATA
);
220 size
= AMD756_BYTE_DATA
;
222 case I2C_SMBUS_WORD_DATA
:
223 outw_p(((addr
& 0x7f) << 1) | (read_write
& 0x01),
225 outb_p(command
, SMB_HOST_COMMAND
);
226 if (read_write
== I2C_SMBUS_WRITE
)
227 outw_p(data
->word
, SMB_HOST_DATA
); /* TODO: endian???? */
228 size
= AMD756_WORD_DATA
;
230 case I2C_SMBUS_BLOCK_DATA
:
231 outw_p(((addr
& 0x7f) << 1) | (read_write
& 0x01),
233 outb_p(command
, SMB_HOST_COMMAND
);
234 if (read_write
== I2C_SMBUS_WRITE
) {
235 len
= data
->block
[0];
240 outw_p(len
, SMB_HOST_DATA
);
241 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
242 for (i
= 1; i
<= len
; i
++)
243 outb_p(data
->block
[i
],
244 SMB_HOST_BLOCK_DATA
);
246 size
= AMD756_BLOCK_DATA
;
249 dev_warn(&adap
->dev
, "Unsupported transaction %d\n", size
);
253 /* How about enabling interrupts... */
254 outw_p(size
& GE_CYC_TYPE_MASK
, SMB_GLOBAL_ENABLE
);
256 status
= amd756_transaction(adap
);
260 if ((read_write
== I2C_SMBUS_WRITE
) || (size
== AMD756_QUICK
))
266 data
->byte
= inw_p(SMB_HOST_DATA
);
268 case AMD756_BYTE_DATA
:
269 data
->byte
= inw_p(SMB_HOST_DATA
);
271 case AMD756_WORD_DATA
:
272 data
->word
= inw_p(SMB_HOST_DATA
); /* TODO: endian???? */
274 case AMD756_BLOCK_DATA
:
275 data
->block
[0] = inw_p(SMB_HOST_DATA
) & 0x3f;
276 if(data
->block
[0] > 32)
278 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
279 for (i
= 1; i
<= data
->block
[0]; i
++)
280 data
->block
[i
] = inb_p(SMB_HOST_BLOCK_DATA
);
287 static u32
amd756_func(struct i2c_adapter
*adapter
)
289 return I2C_FUNC_SMBUS_QUICK
| I2C_FUNC_SMBUS_BYTE
|
290 I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_WORD_DATA
|
291 I2C_FUNC_SMBUS_BLOCK_DATA
;
294 static const struct i2c_algorithm smbus_algorithm
= {
295 .smbus_xfer
= amd756_access
,
296 .functionality
= amd756_func
,
299 struct i2c_adapter amd756_smbus
= {
300 .owner
= THIS_MODULE
,
301 .class = I2C_CLASS_HWMON
| I2C_CLASS_SPD
,
302 .algo
= &smbus_algorithm
,
305 enum chiptype
{ AMD756
, AMD766
, AMD768
, NFORCE
, AMD8111
};
306 static const char* chipname
[] = {
307 "AMD756", "AMD766", "AMD768",
308 "nVidia nForce", "AMD8111",
311 static const struct pci_device_id amd756_ids
[] = {
312 { PCI_DEVICE(PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_VIPER_740B
),
313 .driver_data
= AMD756
},
314 { PCI_DEVICE(PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_VIPER_7413
),
315 .driver_data
= AMD766
},
316 { PCI_DEVICE(PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_OPUS_7443
),
317 .driver_data
= AMD768
},
318 { PCI_DEVICE(PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_8111_SMBUS
),
319 .driver_data
= AMD8111
},
320 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA
, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS
),
321 .driver_data
= NFORCE
},
325 MODULE_DEVICE_TABLE (pci
, amd756_ids
);
327 static int __devinit
amd756_probe(struct pci_dev
*pdev
,
328 const struct pci_device_id
*id
)
330 int nforce
= (id
->driver_data
== NFORCE
);
335 dev_err(&pdev
->dev
, "Only one device supported "
336 "(you have a strange motherboard, btw)\n");
341 if (PCI_FUNC(pdev
->devfn
) != 1)
344 pci_read_config_word(pdev
, SMBBANFORCE
, &amd756_ioport
);
345 amd756_ioport
&= 0xfffc;
347 if (PCI_FUNC(pdev
->devfn
) != 3)
350 pci_read_config_byte(pdev
, SMBGCFG
, &temp
);
351 if ((temp
& 128) == 0) {
353 "Error: SMBus controller I/O not enabled!\n");
357 /* Determine the address of the SMBus areas */
358 /* Technically it is a dword but... */
359 pci_read_config_word(pdev
, SMBBA
, &amd756_ioport
);
360 amd756_ioport
&= 0xff00;
361 amd756_ioport
+= SMB_ADDR_OFFSET
;
364 error
= acpi_check_region(amd756_ioport
, SMB_IOSIZE
,
369 if (!request_region(amd756_ioport
, SMB_IOSIZE
, amd756_driver
.name
)) {
370 dev_err(&pdev
->dev
, "SMB region 0x%x already in use!\n",
375 pci_read_config_byte(pdev
, SMBREV
, &temp
);
376 dev_dbg(&pdev
->dev
, "SMBREV = 0x%X\n", temp
);
377 dev_dbg(&pdev
->dev
, "AMD756_smba = 0x%X\n", amd756_ioport
);
379 /* set up the sysfs linkage to our parent device */
380 amd756_smbus
.dev
.parent
= &pdev
->dev
;
382 snprintf(amd756_smbus
.name
, sizeof(amd756_smbus
.name
),
383 "SMBus %s adapter at %04x", chipname
[id
->driver_data
],
386 error
= i2c_add_adapter(&amd756_smbus
);
389 "Adapter registration failed, module not inserted\n");
396 release_region(amd756_ioport
, SMB_IOSIZE
);
400 static void __devexit
amd756_remove(struct pci_dev
*dev
)
402 i2c_del_adapter(&amd756_smbus
);
403 release_region(amd756_ioport
, SMB_IOSIZE
);
406 static struct pci_driver amd756_driver
= {
407 .name
= "amd756_smbus",
408 .id_table
= amd756_ids
,
409 .probe
= amd756_probe
,
410 .remove
= __devexit_p(amd756_remove
),
413 static int __init
amd756_init(void)
415 return pci_register_driver(&amd756_driver
);
418 static void __exit
amd756_exit(void)
420 pci_unregister_driver(&amd756_driver
);
423 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
424 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
425 MODULE_LICENSE("GPL");
427 EXPORT_SYMBOL(amd756_smbus
);
429 module_init(amd756_init
)
430 module_exit(amd756_exit
)