xref: /linux/drivers/i2c/busses/i2c-amd8111.c (revision d67b569f5f620c0fb95d5212642746b7ba9d29e4)
1 /*
2  * SMBus 2.0 driver for AMD-8111 IO-Hub.
3  *
4  * Copyright (c) 2002 Vojtech Pavlik
5  *
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.
9  */
10 
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>
20 #include <asm/io.h>
21 
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR ("Vojtech Pavlik <vojtech@suse.cz>");
24 MODULE_DESCRIPTION("AMD8111 SMBus 2.0 driver");
25 
26 struct amd_smbus {
27 	struct pci_dev *dev;
28 	struct i2c_adapter adapter;
29 	int base;
30 	int size;
31 };
32 
33 /*
34  * AMD PCI control registers definitions.
35  */
36 
37 #define AMD_PCI_MISC	0x48
38 
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 */
42 
43 /*
44  * ACPI 2.0 chapter 13 PCI interface definitions.
45  */
46 
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 */
51 
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 */
58 
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 */
64 
65 /*
66  * ACPI 2.0 chapter 13 access of registers of the EC
67  */
68 
69 static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
70 {
71 	int timeout = 500;
72 
73 	while (timeout-- && (inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF))
74 		udelay(1);
75 
76 	if (!timeout) {
77 		dev_warn(&smbus->dev->dev, "Timeout while waiting for IBF to clear\n");
78 		return -1;
79 	}
80 
81 	return 0;
82 }
83 
84 static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
85 {
86 	int timeout = 500;
87 
88 	while (timeout-- && (~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF))
89 		udelay(1);
90 
91 	if (!timeout) {
92 		dev_warn(&smbus->dev->dev, "Timeout while waiting for OBF to set\n");
93 		return -1;
94 	}
95 
96 	return 0;
97 }
98 
99 static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address, unsigned char *data)
100 {
101 	if (amd_ec_wait_write(smbus))
102 		return -1;
103 	outb(AMD_EC_CMD_RD, smbus->base + AMD_EC_CMD);
104 
105 	if (amd_ec_wait_write(smbus))
106 		return -1;
107 	outb(address, smbus->base + AMD_EC_DATA);
108 
109 	if (amd_ec_wait_read(smbus))
110 		return -1;
111 	*data = inb(smbus->base + AMD_EC_DATA);
112 
113 	return 0;
114 }
115 
116 static unsigned int amd_ec_write(struct amd_smbus *smbus, unsigned char address, unsigned char data)
117 {
118 	if (amd_ec_wait_write(smbus))
119 		return -1;
120 	outb(AMD_EC_CMD_WR, smbus->base + AMD_EC_CMD);
121 
122 	if (amd_ec_wait_write(smbus))
123 		return -1;
124 	outb(address, smbus->base + AMD_EC_DATA);
125 
126 	if (amd_ec_wait_write(smbus))
127 		return -1;
128 	outb(data, smbus->base + AMD_EC_DATA);
129 
130 	return 0;
131 }
132 
133 /*
134  * ACPI 2.0 chapter 13 SMBus 2.0 EC register model
135  */
136 
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 */
145 
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
150 
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
162 
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
174 
175 
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)
178 {
179 	struct amd_smbus *smbus = adap->algo_data;
180 	unsigned char protocol, len, pec, temp[2];
181 	int i;
182 
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;
185 
186 	switch (size) {
187 
188 		case I2C_SMBUS_QUICK:
189 			protocol |= AMD_SMB_PRTCL_QUICK;
190 			read_write = I2C_SMBUS_WRITE;
191 			break;
192 
193 		case I2C_SMBUS_BYTE:
194 			if (read_write == I2C_SMBUS_WRITE)
195 				amd_ec_write(smbus, AMD_SMB_CMD, command);
196 			protocol |= AMD_SMB_PRTCL_BYTE;
197 			break;
198 
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;
204 			break;
205 
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);
211 			}
212 			protocol |= AMD_SMB_PRTCL_WORD_DATA | pec;
213 			break;
214 
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]);
222 			}
223 			protocol |= AMD_SMB_PRTCL_BLOCK_DATA | pec;
224 			break;
225 
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;
234 			break;
235 
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;
242 			break;
243 
244 		case I2C_SMBUS_BLOCK_PROC_CALL:
245 			protocol |= pec;
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;
253 			break;
254 
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);
260 			return -1;
261 
262 		default:
263 			dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
264 			return -1;
265 	}
266 
267 	amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
268 	amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
269 
270 	amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
271 
272 	if (~temp[0] & AMD_SMB_STS_DONE) {
273 		udelay(500);
274 		amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
275 	}
276 
277 	if (~temp[0] & AMD_SMB_STS_DONE) {
278 		msleep(1);
279 		amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
280 	}
281 
282 	if ((~temp[0] & AMD_SMB_STS_DONE) || (temp[0] & AMD_SMB_STS_STATUS))
283 		return -1;
284 
285 	if (read_write == I2C_SMBUS_WRITE)
286 		return 0;
287 
288 	switch (size) {
289 
290 		case I2C_SMBUS_BYTE:
291 		case I2C_SMBUS_BYTE_DATA:
292 			amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
293 			break;
294 
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];
300 			break;
301 
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;
310 			break;
311 	}
312 
313 	return 0;
314 }
315 
316 
317 static u32 amd8111_func(struct i2c_adapter *adapter)
318 {
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;
323 }
324 
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,
330 };
331 
332 
333 static struct pci_device_id amd8111_ids[] = {
334 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS2) },
335 	{ 0, }
336 };
337 
338 MODULE_DEVICE_TABLE (pci, amd8111_ids);
339 
340 static int __devinit amd8111_probe(struct pci_dev *dev, const struct pci_device_id *id)
341 {
342 	struct amd_smbus *smbus;
343 	int error = -ENODEV;
344 
345 	if (~pci_resource_flags(dev, 0) & IORESOURCE_IO)
346 		return -ENODEV;
347 
348 	smbus = kmalloc(sizeof(struct amd_smbus), GFP_KERNEL);
349 	if (!smbus)
350 		return -ENOMEM;
351 	memset(smbus, 0, sizeof(struct amd_smbus));
352 
353 	smbus->dev = dev;
354 	smbus->base = pci_resource_start(dev, 0);
355 	smbus->size = pci_resource_len(dev, 0);
356 
357 	if (!request_region(smbus->base, smbus->size, "amd8111 SMBus 2.0"))
358 		goto out_kfree;
359 
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;
366 
367 	/* set up the driverfs linkage to our parent device */
368 	smbus->adapter.dev.parent = &dev->dev;
369 
370 	error = i2c_add_adapter(&smbus->adapter);
371 	if (error)
372 		goto out_release_region;
373 
374 	pci_write_config_dword(smbus->dev, AMD_PCI_MISC, 0);
375 	pci_set_drvdata(dev, smbus);
376 	return 0;
377 
378  out_release_region:
379 	release_region(smbus->base, smbus->size);
380  out_kfree:
381 	kfree(smbus);
382 	return -1;
383 }
384 
385 
386 static void __devexit amd8111_remove(struct pci_dev *dev)
387 {
388 	struct amd_smbus *smbus = pci_get_drvdata(dev);
389 
390 	i2c_del_adapter(&smbus->adapter);
391 	release_region(smbus->base, smbus->size);
392 	kfree(smbus);
393 }
394 
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),
400 };
401 
402 static int __init i2c_amd8111_init(void)
403 {
404 	return pci_register_driver(&amd8111_driver);
405 }
406 
407 
408 static void __exit i2c_amd8111_exit(void)
409 {
410 	pci_unregister_driver(&amd8111_driver);
411 }
412 
413 module_init(i2c_amd8111_init);
414 module_exit(i2c_amd8111_exit);
415