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23#include <linux/module.h>
24#include <linux/kernel.h>
25#include <linux/types.h>
26#include <linux/i2c.h>
27#include <linux/init.h>
28#include <linux/device.h>
29#include <linux/platform_device.h>
30#include <asm/prom.h>
31#include <asm/pmac_low_i2c.h>
32
33MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
34MODULE_DESCRIPTION("I2C driver for Apple PowerMac");
35MODULE_LICENSE("GPL");
36
37
38
39
40static s32 i2c_powermac_smbus_xfer( struct i2c_adapter* adap,
41 u16 addr,
42 unsigned short flags,
43 char read_write,
44 u8 command,
45 int size,
46 union i2c_smbus_data* data)
47{
48 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
49 int rc = 0;
50 int read = (read_write == I2C_SMBUS_READ);
51 int addrdir = (addr << 1) | read;
52 int mode, subsize, len;
53 u32 subaddr;
54 u8 *buf;
55 u8 local[2];
56
57 if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) {
58 mode = pmac_i2c_mode_std;
59 subsize = 0;
60 subaddr = 0;
61 } else {
62 mode = read ? pmac_i2c_mode_combined : pmac_i2c_mode_stdsub;
63 subsize = 1;
64 subaddr = command;
65 }
66
67 switch (size) {
68 case I2C_SMBUS_QUICK:
69 buf = NULL;
70 len = 0;
71 break;
72 case I2C_SMBUS_BYTE:
73 case I2C_SMBUS_BYTE_DATA:
74 buf = &data->byte;
75 len = 1;
76 break;
77 case I2C_SMBUS_WORD_DATA:
78 if (!read) {
79 local[0] = data->word & 0xff;
80 local[1] = (data->word >> 8) & 0xff;
81 }
82 buf = local;
83 len = 2;
84 break;
85
86
87
88
89
90
91
92
93
94
95
96
97 case I2C_SMBUS_BLOCK_DATA:
98 buf = data->block;
99 len = data->block[0] + 1;
100 break;
101 case I2C_SMBUS_I2C_BLOCK_DATA:
102 buf = &data->block[1];
103 len = data->block[0];
104 break;
105
106 default:
107 return -EINVAL;
108 }
109
110 rc = pmac_i2c_open(bus, 0);
111 if (rc) {
112 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
113 return rc;
114 }
115
116 rc = pmac_i2c_setmode(bus, mode);
117 if (rc) {
118 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
119 mode, rc);
120 goto bail;
121 }
122
123 rc = pmac_i2c_xfer(bus, addrdir, subsize, subaddr, buf, len);
124 if (rc) {
125 if (rc == -ENXIO)
126 dev_dbg(&adap->dev,
127 "I2C transfer at 0x%02x failed, size %d, "
128 "err %d\n", addrdir >> 1, size, rc);
129 else
130 dev_err(&adap->dev,
131 "I2C transfer at 0x%02x failed, size %d, "
132 "err %d\n", addrdir >> 1, size, rc);
133 goto bail;
134 }
135
136 if (size == I2C_SMBUS_WORD_DATA && read) {
137 data->word = ((u16)local[1]) << 8;
138 data->word |= local[0];
139 }
140
141 bail:
142 pmac_i2c_close(bus);
143 return rc;
144}
145
146
147
148
149
150
151static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
152 struct i2c_msg *msgs,
153 int num)
154{
155 struct pmac_i2c_bus *bus = i2c_get_adapdata(adap);
156 int rc = 0;
157 int read;
158 int addrdir;
159
160 if (num != 1) {
161 dev_err(&adap->dev,
162 "Multi-message I2C transactions not supported\n");
163 return -EOPNOTSUPP;
164 }
165
166 if (msgs->flags & I2C_M_TEN)
167 return -EINVAL;
168 read = (msgs->flags & I2C_M_RD) != 0;
169 addrdir = (msgs->addr << 1) | read;
170
171 rc = pmac_i2c_open(bus, 0);
172 if (rc) {
173 dev_err(&adap->dev, "Failed to open I2C, err %d\n", rc);
174 return rc;
175 }
176 rc = pmac_i2c_setmode(bus, pmac_i2c_mode_std);
177 if (rc) {
178 dev_err(&adap->dev, "Failed to set I2C mode %d, err %d\n",
179 pmac_i2c_mode_std, rc);
180 goto bail;
181 }
182 rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
183 if (rc < 0) {
184 if (rc == -ENXIO)
185 dev_dbg(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
186 addrdir & 1 ? "read from" : "write to",
187 addrdir >> 1, rc);
188 else
189 dev_err(&adap->dev, "I2C %s 0x%02x failed, err %d\n",
190 addrdir & 1 ? "read from" : "write to",
191 addrdir >> 1, rc);
192 }
193 bail:
194 pmac_i2c_close(bus);
195 return rc < 0 ? rc : 1;
196}
197
198static u32 i2c_powermac_func(struct i2c_adapter * adapter)
199{
200 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
201 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
202 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_I2C;
203}
204
205
206static const struct i2c_algorithm i2c_powermac_algorithm = {
207 .smbus_xfer = i2c_powermac_smbus_xfer,
208 .master_xfer = i2c_powermac_master_xfer,
209 .functionality = i2c_powermac_func,
210};
211
212
213static int i2c_powermac_remove(struct platform_device *dev)
214{
215 struct i2c_adapter *adapter = platform_get_drvdata(dev);
216
217 i2c_del_adapter(adapter);
218 memset(adapter, 0, sizeof(*adapter));
219
220 return 0;
221}
222
223static u32 i2c_powermac_get_addr(struct i2c_adapter *adap,
224 struct pmac_i2c_bus *bus,
225 struct device_node *node)
226{
227 const __be32 *prop;
228 int len;
229
230
231 prop = of_get_property(node, "reg", &len);
232 if (prop && (len >= sizeof(int)))
233 return (be32_to_cpup(prop) & 0xff) >> 1;
234
235
236 prop = of_get_property(node, "i2c-address", &len);
237 if (prop && (len >= sizeof(int)))
238 return (be32_to_cpup(prop) & 0xff) >> 1;
239
240
241 if (!strcmp(node->name, "cereal"))
242 return 0x60;
243 else if (!strcmp(node->name, "deq"))
244 return 0x34;
245
246 dev_warn(&adap->dev, "No i2c address for %s\n", node->full_name);
247
248 return 0xffffffff;
249}
250
251static void i2c_powermac_create_one(struct i2c_adapter *adap,
252 const char *type,
253 u32 addr)
254{
255 struct i2c_board_info info = {};
256 struct i2c_client *newdev;
257
258 strncpy(info.type, type, sizeof(info.type));
259 info.addr = addr;
260 newdev = i2c_new_device(adap, &info);
261 if (!newdev)
262 dev_err(&adap->dev,
263 "i2c-powermac: Failure to register missing %s\n",
264 type);
265}
266
267static void i2c_powermac_add_missing(struct i2c_adapter *adap,
268 struct pmac_i2c_bus *bus,
269 bool found_onyx)
270{
271 struct device_node *busnode = pmac_i2c_get_bus_node(bus);
272 int rc;
273
274
275#define ONYX_REG_CONTROL 67
276 if (of_device_is_compatible(busnode, "k2-i2c") && !found_onyx) {
277 union i2c_smbus_data data;
278
279 rc = i2c_smbus_xfer(adap, 0x46, 0, I2C_SMBUS_READ,
280 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
281 &data);
282 if (rc >= 0)
283 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x46);
284
285 rc = i2c_smbus_xfer(adap, 0x47, 0, I2C_SMBUS_READ,
286 ONYX_REG_CONTROL, I2C_SMBUS_BYTE_DATA,
287 &data);
288 if (rc >= 0)
289 i2c_powermac_create_one(adap, "MAC,pcm3052", 0x47);
290 }
291}
292
293static bool i2c_powermac_get_type(struct i2c_adapter *adap,
294 struct device_node *node,
295 u32 addr, char *type, int type_size)
296{
297 char tmp[16];
298
299
300
301
302
303
304
305
306
307
308
309
310 if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
311 snprintf(type, type_size, "MAC,%s", tmp);
312 return true;
313 }
314
315
316 if (!strcmp(node->name, "deq")) {
317
318 if (addr == 0x34) {
319 snprintf(type, type_size, "MAC,tas3001");
320 return true;
321 } else if (addr == 0x35) {
322 snprintf(type, type_size, "MAC,tas3004");
323 return true;
324 }
325 }
326
327 dev_err(&adap->dev, "i2c-powermac: modalias failure"
328 " on %s\n", node->full_name);
329 return false;
330}
331
332static void i2c_powermac_register_devices(struct i2c_adapter *adap,
333 struct pmac_i2c_bus *bus)
334{
335 struct i2c_client *newdev;
336 struct device_node *node;
337 bool found_onyx = 0;
338
339
340
341
342
343
344 if (!strcmp(adap->dev.of_node->name, "via-pmu"))
345 return;
346
347 for_each_child_of_node(adap->dev.of_node, node) {
348 struct i2c_board_info info = {};
349 u32 addr;
350
351
352 addr = i2c_powermac_get_addr(adap, bus, node);
353 if (addr == 0xffffffff)
354 continue;
355
356
357 if (!pmac_i2c_match_adapter(node, adap))
358 continue;
359
360 dev_dbg(&adap->dev, "i2c-powermac: register %s\n",
361 node->full_name);
362
363
364
365
366
367 if (of_device_is_compatible(node, "pcm3052"))
368 found_onyx = true;
369
370
371 if (!i2c_powermac_get_type(adap, node, addr,
372 info.type, sizeof(info.type))) {
373 continue;
374 }
375
376
377 info.addr = addr;
378 info.irq = irq_of_parse_and_map(node, 0);
379 info.of_node = of_node_get(node);
380
381 newdev = i2c_new_device(adap, &info);
382 if (!newdev) {
383 dev_err(&adap->dev, "i2c-powermac: Failure to register"
384 " %s\n", node->full_name);
385 of_node_put(node);
386
387
388
389
390
391 continue;
392 }
393 }
394
395
396 i2c_powermac_add_missing(adap, bus, found_onyx);
397}
398
399static int i2c_powermac_probe(struct platform_device *dev)
400{
401 struct pmac_i2c_bus *bus = dev->dev.platform_data;
402 struct device_node *parent = NULL;
403 struct i2c_adapter *adapter;
404 const char *basename;
405 int rc;
406
407 if (bus == NULL)
408 return -EINVAL;
409 adapter = pmac_i2c_get_adapter(bus);
410
411
412
413
414
415
416 switch(pmac_i2c_get_type(bus)) {
417 case pmac_i2c_bus_keywest:
418 parent = of_get_parent(pmac_i2c_get_controller(bus));
419 if (parent == NULL)
420 return -EINVAL;
421 basename = parent->name;
422 break;
423 case pmac_i2c_bus_pmu:
424 basename = "pmu";
425 break;
426 case pmac_i2c_bus_smu:
427
428
429
430 basename = "smu";
431 break;
432 default:
433 return -EINVAL;
434 }
435 snprintf(adapter->name, sizeof(adapter->name), "%s %d", basename,
436 pmac_i2c_get_channel(bus));
437 of_node_put(parent);
438
439 platform_set_drvdata(dev, adapter);
440 adapter->algo = &i2c_powermac_algorithm;
441 i2c_set_adapdata(adapter, bus);
442 adapter->dev.parent = &dev->dev;
443 adapter->dev.of_node = dev->dev.of_node;
444 rc = i2c_add_adapter(adapter);
445 if (rc) {
446 printk(KERN_ERR "i2c-powermac: Adapter %s registration "
447 "failed\n", adapter->name);
448 memset(adapter, 0, sizeof(*adapter));
449 }
450
451 printk(KERN_INFO "PowerMac i2c bus %s registered\n", adapter->name);
452
453
454
455
456 i2c_powermac_register_devices(adapter, bus);
457
458 return rc;
459}
460
461static struct platform_driver i2c_powermac_driver = {
462 .probe = i2c_powermac_probe,
463 .remove = i2c_powermac_remove,
464 .driver = {
465 .name = "i2c-powermac",
466 .bus = &platform_bus_type,
467 },
468};
469
470module_platform_driver(i2c_powermac_driver);
471
472MODULE_ALIAS("platform:i2c-powermac");
473