2 * SMBus 2.0 driver for AMD-8111 IO-Hub.
4 * Copyright (c) 2002 Vojtech Pavlik
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation version 2.
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/kernel.h>
14 #include <linux/stddef.h>
15 #include <linux/sched.h>
16 #include <linux/ioport.h>
17 #include <linux/init.h>
18 #include <linux/i2c.h>
19 #include <linux/delay.h>
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
24 MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");
28 struct i2c_adapter adapter;
34 * AMD PCI control registers definitions.
37 #define AMD_PCI_MISC 0x48
39 #define AMD_PCI_MISC_SCI 0x04 /* deliver SCI */
40 #define AMD_PCI_MISC_INT 0x02 /* deliver PCI IRQ */
41 #define AMD_PCI_MISC_SPEEDUP 0x01 /* 16x clock speedup */
44 * ACPI 2.0 chapter 13 PCI interface definitions.
47 #define AMD_EC_DATA 0x00 /* data register */
48 #define AMD_EC_SC 0x04 /* status of controller */
49 #define AMD_EC_CMD 0x04 /* command register */
50 #define AMD_EC_ICR 0x08 /* interrupt control register */
52 #define AMD_EC_SC_SMI 0x04 /* smi event pending */
53 #define AMD_EC_SC_SCI 0x02 /* sci event pending */
54 #define AMD_EC_SC_BURST 0x01 /* burst mode enabled */
55 #define AMD_EC_SC_CMD 0x08 /* byte in data reg is command */
56 #define AMD_EC_SC_IBF 0x02 /* data ready for embedded controller */
57 #define AMD_EC_SC_OBF 0x01 /* data ready for host */
59 #define AMD_EC_CMD_RD 0x80 /* read EC */
60 #define AMD_EC_CMD_WR 0x81 /* write EC */
61 #define AMD_EC_CMD_BE 0x82 /* enable burst mode */
62 #define AMD_EC_CMD_BD 0x83 /* disable burst mode */
63 #define AMD_EC_CMD_QR 0x84 /* query EC */
66 * ACPI 2.0 chapter 13 access of registers of the EC
69 static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
73 while (timeout-- && (inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF))
77 dev_warn(&smbus->dev->dev, "Timeout while waiting for IBF to clear\n");
84 static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
88 while (timeout-- && (~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF))
92 dev_warn(&smbus->dev->dev, "Timeout while waiting for OBF to set\n");
99 static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address, unsigned char *data)
101 if (amd_ec_wait_write(smbus))
103 outb(AMD_EC_CMD_RD, smbus->base + AMD_EC_CMD);
105 if (amd_ec_wait_write(smbus))
107 outb(address, smbus->base + AMD_EC_DATA);
109 if (amd_ec_wait_read(smbus))
111 *data = inb(smbus->base + AMD_EC_DATA);
116 static unsigned int amd_ec_write(struct amd_smbus *smbus, unsigned char address, unsigned char data)
118 if (amd_ec_wait_write(smbus))
120 outb(AMD_EC_CMD_WR, smbus->base + AMD_EC_CMD);
122 if (amd_ec_wait_write(smbus))
124 outb(address, smbus->base + AMD_EC_DATA);
126 if (amd_ec_wait_write(smbus))
128 outb(data, smbus->base + AMD_EC_DATA);
134 * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
137 #define AMD_SMB_PRTCL 0x00 /* protocol, PEC */
138 #define AMD_SMB_STS 0x01 /* status */
139 #define AMD_SMB_ADDR 0x02 /* address */
140 #define AMD_SMB_CMD 0x03 /* command */
141 #define AMD_SMB_DATA 0x04 /* 32 data registers */
142 #define AMD_SMB_BCNT 0x24 /* number of data bytes */
143 #define AMD_SMB_ALRM_A 0x25 /* alarm address */
144 #define AMD_SMB_ALRM_D 0x26 /* 2 bytes alarm data */
146 #define AMD_SMB_STS_DONE 0x80
147 #define AMD_SMB_STS_ALRM 0x40
148 #define AMD_SMB_STS_RES 0x20
149 #define AMD_SMB_STS_STATUS 0x1f
151 #define AMD_SMB_STATUS_OK 0x00
152 #define AMD_SMB_STATUS_FAIL 0x07
153 #define AMD_SMB_STATUS_DNAK 0x10
154 #define AMD_SMB_STATUS_DERR 0x11
155 #define AMD_SMB_STATUS_CMD_DENY 0x12
156 #define AMD_SMB_STATUS_UNKNOWN 0x13
157 #define AMD_SMB_STATUS_ACC_DENY 0x17
158 #define AMD_SMB_STATUS_TIMEOUT 0x18
159 #define AMD_SMB_STATUS_NOTSUP 0x19
160 #define AMD_SMB_STATUS_BUSY 0x1A
161 #define AMD_SMB_STATUS_PEC 0x1F
163 #define AMD_SMB_PRTCL_WRITE 0x00
164 #define AMD_SMB_PRTCL_READ 0x01
165 #define AMD_SMB_PRTCL_QUICK 0x02
166 #define AMD_SMB_PRTCL_BYTE 0x04
167 #define AMD_SMB_PRTCL_BYTE_DATA 0x06
168 #define AMD_SMB_PRTCL_WORD_DATA 0x08
169 #define AMD_SMB_PRTCL_BLOCK_DATA 0x0a
170 #define AMD_SMB_PRTCL_PROC_CALL 0x0c
171 #define AMD_SMB_PRTCL_BLOCK_PROC_CALL 0x0d
172 #define AMD_SMB_PRTCL_I2C_BLOCK_DATA 0x4a
173 #define AMD_SMB_PRTCL_PEC 0x80
176 static s32 amd8111_access(struct i2c_adapter * adap, u16 addr, unsigned short flags,
177 char read_write, u8 command, int size, union i2c_smbus_data * data)
179 struct amd_smbus *smbus = adap->algo_data;
180 unsigned char protocol, len, pec, temp[2];
183 protocol = (read_write == I2C_SMBUS_READ) ? AMD_SMB_PRTCL_READ : AMD_SMB_PRTCL_WRITE;
184 pec = (flags & I2C_CLIENT_PEC) ? AMD_SMB_PRTCL_PEC : 0;
188 case I2C_SMBUS_QUICK:
189 protocol |= AMD_SMB_PRTCL_QUICK;
190 read_write = I2C_SMBUS_WRITE;
194 if (read_write == I2C_SMBUS_WRITE)
195 amd_ec_write(smbus, AMD_SMB_CMD, command);
196 protocol |= AMD_SMB_PRTCL_BYTE;
199 case I2C_SMBUS_BYTE_DATA:
200 amd_ec_write(smbus, AMD_SMB_CMD, command);
201 if (read_write == I2C_SMBUS_WRITE)
202 amd_ec_write(smbus, AMD_SMB_DATA, data->byte);
203 protocol |= AMD_SMB_PRTCL_BYTE_DATA;
206 case I2C_SMBUS_WORD_DATA:
207 amd_ec_write(smbus, AMD_SMB_CMD, command);
208 if (read_write == I2C_SMBUS_WRITE) {
209 amd_ec_write(smbus, AMD_SMB_DATA, data->word);
210 amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
212 protocol |= AMD_SMB_PRTCL_WORD_DATA | pec;
215 case I2C_SMBUS_BLOCK_DATA:
216 amd_ec_write(smbus, AMD_SMB_CMD, command);
217 if (read_write == I2C_SMBUS_WRITE) {
218 len = min_t(u8, data->block[0], 32);
219 amd_ec_write(smbus, AMD_SMB_BCNT, len);
220 for (i = 0; i < len; i++)
221 amd_ec_write(smbus, AMD_SMB_DATA + i, data->block[i + 1]);
223 protocol |= AMD_SMB_PRTCL_BLOCK_DATA | pec;
226 case I2C_SMBUS_I2C_BLOCK_DATA:
227 len = min_t(u8, data->block[0], 32);
228 amd_ec_write(smbus, AMD_SMB_CMD, command);
229 amd_ec_write(smbus, AMD_SMB_BCNT, len);
230 if (read_write == I2C_SMBUS_WRITE)
231 for (i = 0; i < len; i++)
232 amd_ec_write(smbus, AMD_SMB_DATA + i, data->block[i + 1]);
233 protocol |= AMD_SMB_PRTCL_I2C_BLOCK_DATA;
236 case I2C_SMBUS_PROC_CALL:
237 amd_ec_write(smbus, AMD_SMB_CMD, command);
238 amd_ec_write(smbus, AMD_SMB_DATA, data->word);
239 amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
240 protocol = AMD_SMB_PRTCL_PROC_CALL | pec;
241 read_write = I2C_SMBUS_READ;
244 case I2C_SMBUS_BLOCK_PROC_CALL:
246 len = min_t(u8, data->block[0], 31);
247 amd_ec_write(smbus, AMD_SMB_CMD, command);
248 amd_ec_write(smbus, AMD_SMB_BCNT, len);
249 for (i = 0; i < len; i++)
250 amd_ec_write(smbus, AMD_SMB_DATA + i, data->block[i + 1]);
251 protocol = AMD_SMB_PRTCL_BLOCK_PROC_CALL | pec;
252 read_write = I2C_SMBUS_READ;
255 case I2C_SMBUS_WORD_DATA_PEC:
256 case I2C_SMBUS_BLOCK_DATA_PEC:
257 case I2C_SMBUS_PROC_CALL_PEC:
258 case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
259 dev_warn(&adap->dev, "Unexpected software PEC transaction %d\n.", size);
263 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
267 amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
268 amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
270 amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
272 if (~temp[0] & AMD_SMB_STS_DONE) {
274 amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
277 if (~temp[0] & AMD_SMB_STS_DONE) {
279 amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
282 if ((~temp[0] & AMD_SMB_STS_DONE) || (temp[0] & AMD_SMB_STS_STATUS))
285 if (read_write == I2C_SMBUS_WRITE)
291 case I2C_SMBUS_BYTE_DATA:
292 amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
295 case I2C_SMBUS_WORD_DATA:
296 case I2C_SMBUS_PROC_CALL:
297 amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
298 amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
299 data->word = (temp[1] << 8) | temp[0];
302 case I2C_SMBUS_BLOCK_DATA:
303 case I2C_SMBUS_BLOCK_PROC_CALL:
304 amd_ec_read(smbus, AMD_SMB_BCNT, &len);
305 len = min_t(u8, len, 32);
306 case I2C_SMBUS_I2C_BLOCK_DATA:
307 for (i = 0; i < len; i++)
308 amd_ec_read(smbus, AMD_SMB_DATA + i, data->block + i + 1);
309 data->block[0] = len;
317 static u32 amd8111_func(struct i2c_adapter *adapter)
319 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA |
320 I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BLOCK_DATA |
321 I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
322 I2C_FUNC_SMBUS_I2C_BLOCK | I2C_FUNC_SMBUS_HWPEC_CALC;
325 static struct i2c_algorithm smbus_algorithm = {
326 .name = "Non-I2C SMBus 2.0 adapter",
327 .id = I2C_ALGO_SMBUS,
328 .smbus_xfer = amd8111_access,
329 .functionality = amd8111_func,
333 static struct pci_device_id amd8111_ids[] = {
334 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
338 MODULE_DEVICE_TABLE (pci, amd8111_ids);
340 static int __devinit amd8111_probe(struct pci_dev *dev, const struct pci_device_id *id)
342 struct amd_smbus *smbus;
345 if (~pci_resource_flags(dev, 0) & IORESOURCE_IO)
348 smbus = kmalloc(sizeof(struct amd_smbus), GFP_KERNEL);
351 memset(smbus, 0, sizeof(struct amd_smbus));
354 smbus->base = pci_resource_start(dev, 0);
355 smbus->size = pci_resource_len(dev, 0);
357 if (!request_region(smbus->base, smbus->size, "amd8111 SMBus 2.0"))
360 smbus->adapter.owner = THIS_MODULE;
361 snprintf(smbus->adapter.name, I2C_NAME_SIZE,
362 "SMBus2 AMD8111 adapter at %04x", smbus->base);
363 smbus->adapter.class = I2C_CLASS_HWMON;
364 smbus->adapter.algo = &smbus_algorithm;
365 smbus->adapter.algo_data = smbus;
367 /* set up the driverfs linkage to our parent device */
368 smbus->adapter.dev.parent = &dev->dev;
370 error = i2c_add_adapter(&smbus->adapter);
372 goto out_release_region;
374 pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
375 pci_set_drvdata(dev, smbus);
379 release_region(smbus->base, smbus->size);
386 static void __devexit amd8111_remove(struct pci_dev *dev)
388 struct amd_smbus *smbus = pci_get_drvdata(dev);
390 i2c_del_adapter(&smbus->adapter);
391 release_region(smbus->base, smbus->size);
395 static struct pci_driver amd8111_driver = {
396 .name = "amd8111_smbus2",
397 .id_table = amd8111_ids,
398 .probe = amd8111_probe,
399 .remove = __devexit_p(amd8111_remove),
402 static int __init i2c_amd8111_init(void)
404 return pci_register_driver(&amd8111_driver);
408 static void __exit i2c_amd8111_exit(void)
410 pci_unregister_driver(&amd8111_driver);
413 module_init(i2c_amd8111_init);
414 module_exit(i2c_amd8111_exit);