1 /*
2  * Copyright 2013 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Ben Skeggs
23  */
24 #include "priv.h"
25 #include "aux.h"
26 #include "bus.h"
27 #include "pad.h"
28 
29 #include <core/notify.h>
30 #include <core/option.h>
31 #include <subdev/bios.h>
32 #include <subdev/bios/dcb.h>
33 #include <subdev/bios/i2c.h>
34 
35 static struct nvkm_i2c_pad *
36 nvkm_i2c_pad_find(struct nvkm_i2c *i2c, int id)
37 {
38 	struct nvkm_i2c_pad *pad;
39 
40 	list_for_each_entry(pad, &i2c->pad, head) {
41 		if (pad->id == id)
42 			return pad;
43 	}
44 
45 	return NULL;
46 }
47 
48 struct nvkm_i2c_bus *
49 nvkm_i2c_bus_find(struct nvkm_i2c *i2c, int id)
50 {
51 	struct nvkm_bios *bios = i2c->subdev.device->bios;
52 	struct nvkm_i2c_bus *bus;
53 
54 	if (id == NVKM_I2C_BUS_PRI || id == NVKM_I2C_BUS_SEC) {
55 		u8  ver, hdr, cnt, len;
56 		u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
57 		if (i2c && ver >= 0x30) {
58 			u8 auxidx = nvbios_rd08(bios, i2c + 4);
59 			if (id == NVKM_I2C_BUS_PRI)
60 				id = NVKM_I2C_BUS_CCB((auxidx & 0x0f) >> 0);
61 			else
62 				id = NVKM_I2C_BUS_CCB((auxidx & 0xf0) >> 4);
63 		} else {
64 			id = NVKM_I2C_BUS_CCB(2);
65 		}
66 	}
67 
68 	list_for_each_entry(bus, &i2c->bus, head) {
69 		if (bus->id == id)
70 			return bus;
71 	}
72 
73 	return NULL;
74 }
75 
76 struct nvkm_i2c_aux *
77 nvkm_i2c_aux_find(struct nvkm_i2c *i2c, int id)
78 {
79 	struct nvkm_i2c_aux *aux;
80 
81 	list_for_each_entry(aux, &i2c->aux, head) {
82 		if (aux->id == id)
83 			return aux;
84 	}
85 
86 	return NULL;
87 }
88 
89 static void
90 nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int id)
91 {
92 	struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
93 	struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
94 	if (aux)
95 		i2c->func->aux_mask(i2c, type, aux->intr, 0);
96 }
97 
98 static void
99 nvkm_i2c_intr_init(struct nvkm_event *event, int type, int id)
100 {
101 	struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
102 	struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
103 	if (aux)
104 		i2c->func->aux_mask(i2c, type, aux->intr, aux->intr);
105 }
106 
107 static int
108 nvkm_i2c_intr_ctor(struct nvkm_object *object, void *data, u32 size,
109 		   struct nvkm_notify *notify)
110 {
111 	struct nvkm_i2c_ntfy_req *req = data;
112 	if (!WARN_ON(size != sizeof(*req))) {
113 		notify->size  = sizeof(struct nvkm_i2c_ntfy_rep);
114 		notify->types = req->mask;
115 		notify->index = req->port;
116 		return 0;
117 	}
118 	return -EINVAL;
119 }
120 
121 static const struct nvkm_event_func
122 nvkm_i2c_intr_func = {
123 	.ctor = nvkm_i2c_intr_ctor,
124 	.init = nvkm_i2c_intr_init,
125 	.fini = nvkm_i2c_intr_fini,
126 };
127 
128 static void
129 nvkm_i2c_intr(struct nvkm_subdev *subdev)
130 {
131 	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
132 	struct nvkm_i2c_aux *aux;
133 	u32 hi, lo, rq, tx;
134 
135 	if (!i2c->func->aux_stat)
136 		return;
137 
138 	i2c->func->aux_stat(i2c, &hi, &lo, &rq, &tx);
139 	if (!hi && !lo && !rq && !tx)
140 		return;
141 
142 	list_for_each_entry(aux, &i2c->aux, head) {
143 		u32 mask = 0;
144 		if (hi & aux->intr) mask |= NVKM_I2C_PLUG;
145 		if (lo & aux->intr) mask |= NVKM_I2C_UNPLUG;
146 		if (rq & aux->intr) mask |= NVKM_I2C_IRQ;
147 		if (tx & aux->intr) mask |= NVKM_I2C_DONE;
148 		if (mask) {
149 			struct nvkm_i2c_ntfy_rep rep = {
150 				.mask = mask,
151 			};
152 			nvkm_event_send(&i2c->event, rep.mask, aux->id,
153 					&rep, sizeof(rep));
154 		}
155 	}
156 }
157 
158 static int
159 nvkm_i2c_fini(struct nvkm_subdev *subdev, bool suspend)
160 {
161 	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
162 	struct nvkm_i2c_pad *pad;
163 	struct nvkm_i2c_bus *bus;
164 	struct nvkm_i2c_aux *aux;
165 	u32 mask;
166 
167 	list_for_each_entry(aux, &i2c->aux, head) {
168 		nvkm_i2c_aux_fini(aux);
169 	}
170 
171 	list_for_each_entry(bus, &i2c->bus, head) {
172 		nvkm_i2c_bus_fini(bus);
173 	}
174 
175 	if ((mask = (1 << i2c->func->aux) - 1), i2c->func->aux_stat) {
176 		i2c->func->aux_mask(i2c, NVKM_I2C_ANY, mask, 0);
177 		i2c->func->aux_stat(i2c, &mask, &mask, &mask, &mask);
178 	}
179 
180 	list_for_each_entry(pad, &i2c->pad, head) {
181 		nvkm_i2c_pad_fini(pad);
182 	}
183 
184 	return 0;
185 }
186 
187 static int
188 nvkm_i2c_preinit(struct nvkm_subdev *subdev)
189 {
190 	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
191 	struct nvkm_i2c_bus *bus;
192 	struct nvkm_i2c_pad *pad;
193 
194 	/*
195 	 * We init our i2c busses as early as possible, since they may be
196 	 * needed by the vbios init scripts on some cards
197 	 */
198 	list_for_each_entry(pad, &i2c->pad, head)
199 		nvkm_i2c_pad_init(pad);
200 	list_for_each_entry(bus, &i2c->bus, head)
201 		nvkm_i2c_bus_init(bus);
202 
203 	return 0;
204 }
205 
206 static int
207 nvkm_i2c_init(struct nvkm_subdev *subdev)
208 {
209 	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
210 	struct nvkm_i2c_bus *bus;
211 	struct nvkm_i2c_pad *pad;
212 	struct nvkm_i2c_aux *aux;
213 
214 	list_for_each_entry(pad, &i2c->pad, head) {
215 		nvkm_i2c_pad_init(pad);
216 	}
217 
218 	list_for_each_entry(bus, &i2c->bus, head) {
219 		nvkm_i2c_bus_init(bus);
220 	}
221 
222 	list_for_each_entry(aux, &i2c->aux, head) {
223 		nvkm_i2c_aux_init(aux);
224 	}
225 
226 	return 0;
227 }
228 
229 static void *
230 nvkm_i2c_dtor(struct nvkm_subdev *subdev)
231 {
232 	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
233 
234 	nvkm_event_fini(&i2c->event);
235 
236 	while (!list_empty(&i2c->aux)) {
237 		struct nvkm_i2c_aux *aux =
238 			list_first_entry(&i2c->aux, typeof(*aux), head);
239 		nvkm_i2c_aux_del(&aux);
240 	}
241 
242 	while (!list_empty(&i2c->bus)) {
243 		struct nvkm_i2c_bus *bus =
244 			list_first_entry(&i2c->bus, typeof(*bus), head);
245 		nvkm_i2c_bus_del(&bus);
246 	}
247 
248 	while (!list_empty(&i2c->pad)) {
249 		struct nvkm_i2c_pad *pad =
250 			list_first_entry(&i2c->pad, typeof(*pad), head);
251 		nvkm_i2c_pad_del(&pad);
252 	}
253 
254 	return i2c;
255 }
256 
257 static const struct nvkm_subdev_func
258 nvkm_i2c = {
259 	.dtor = nvkm_i2c_dtor,
260 	.preinit = nvkm_i2c_preinit,
261 	.init = nvkm_i2c_init,
262 	.fini = nvkm_i2c_fini,
263 	.intr = nvkm_i2c_intr,
264 };
265 
266 static const struct nvkm_i2c_drv {
267 	u8 bios;
268 	u8 addr;
269 	int (*pad_new)(struct nvkm_i2c_bus *, int id, u8 addr,
270 		       struct nvkm_i2c_pad **);
271 }
272 nvkm_i2c_drv[] = {
273 	{ 0x0d, 0x39, anx9805_pad_new },
274 	{ 0x0e, 0x3b, anx9805_pad_new },
275 	{}
276 };
277 
278 int
279 nvkm_i2c_new_(const struct nvkm_i2c_func *func, struct nvkm_device *device,
280 	      enum nvkm_subdev_type type, int inst, struct nvkm_i2c **pi2c)
281 {
282 	struct nvkm_bios *bios = device->bios;
283 	struct nvkm_i2c *i2c;
284 	struct dcb_i2c_entry ccbE;
285 	struct dcb_output dcbE;
286 	u8 ver, hdr;
287 	int ret, i;
288 
289 	if (!(i2c = *pi2c = kzalloc(sizeof(*i2c), GFP_KERNEL)))
290 		return -ENOMEM;
291 
292 	nvkm_subdev_ctor(&nvkm_i2c, device, type, inst, &i2c->subdev);
293 	i2c->func = func;
294 	INIT_LIST_HEAD(&i2c->pad);
295 	INIT_LIST_HEAD(&i2c->bus);
296 	INIT_LIST_HEAD(&i2c->aux);
297 
298 	i = -1;
299 	while (!dcb_i2c_parse(bios, ++i, &ccbE)) {
300 		struct nvkm_i2c_pad *pad = NULL;
301 		struct nvkm_i2c_bus *bus = NULL;
302 		struct nvkm_i2c_aux *aux = NULL;
303 
304 		nvkm_debug(&i2c->subdev, "ccb %02x: type %02x drive %02x "
305 			   "sense %02x share %02x auxch %02x\n", i, ccbE.type,
306 			   ccbE.drive, ccbE.sense, ccbE.share, ccbE.auxch);
307 
308 		if (ccbE.share != DCB_I2C_UNUSED) {
309 			const int id = NVKM_I2C_PAD_HYBRID(ccbE.share);
310 			if (!(pad = nvkm_i2c_pad_find(i2c, id)))
311 				ret = func->pad_s_new(i2c, id, &pad);
312 			else
313 				ret = 0;
314 		} else {
315 			ret = func->pad_x_new(i2c, NVKM_I2C_PAD_CCB(i), &pad);
316 		}
317 
318 		if (ret) {
319 			nvkm_error(&i2c->subdev, "ccb %02x pad, %d\n", i, ret);
320 			nvkm_i2c_pad_del(&pad);
321 			continue;
322 		}
323 
324 		if (pad->func->bus_new_0 && ccbE.type == DCB_I2C_NV04_BIT) {
325 			ret = pad->func->bus_new_0(pad, NVKM_I2C_BUS_CCB(i),
326 						   ccbE.drive,
327 						   ccbE.sense, &bus);
328 		} else
329 		if (pad->func->bus_new_4 &&
330 		    ( ccbE.type == DCB_I2C_NV4E_BIT ||
331 		      ccbE.type == DCB_I2C_NVIO_BIT ||
332 		     (ccbE.type == DCB_I2C_PMGR &&
333 		      ccbE.drive != DCB_I2C_UNUSED))) {
334 			ret = pad->func->bus_new_4(pad, NVKM_I2C_BUS_CCB(i),
335 						   ccbE.drive, &bus);
336 		}
337 
338 		if (ret) {
339 			nvkm_error(&i2c->subdev, "ccb %02x bus, %d\n", i, ret);
340 			nvkm_i2c_bus_del(&bus);
341 		}
342 
343 		if (pad->func->aux_new_6 &&
344 		    ( ccbE.type == DCB_I2C_NVIO_AUX ||
345 		     (ccbE.type == DCB_I2C_PMGR &&
346 		      ccbE.auxch != DCB_I2C_UNUSED))) {
347 			ret = pad->func->aux_new_6(pad, NVKM_I2C_BUS_CCB(i),
348 						   ccbE.auxch, &aux);
349 		} else {
350 			ret = 0;
351 		}
352 
353 		if (ret) {
354 			nvkm_error(&i2c->subdev, "ccb %02x aux, %d\n", i, ret);
355 			nvkm_i2c_aux_del(&aux);
356 		}
357 
358 		if (ccbE.type != DCB_I2C_UNUSED && !bus && !aux) {
359 			nvkm_warn(&i2c->subdev, "ccb %02x was ignored\n", i);
360 			continue;
361 		}
362 	}
363 
364 	i = -1;
365 	while (dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE)) {
366 		const struct nvkm_i2c_drv *drv = nvkm_i2c_drv;
367 		struct nvkm_i2c_bus *bus;
368 		struct nvkm_i2c_pad *pad;
369 
370 		/* internal outputs handled by native i2c busses (above) */
371 		if (!dcbE.location)
372 			continue;
373 
374 		/* we need an i2c bus to talk to the external encoder */
375 		bus = nvkm_i2c_bus_find(i2c, dcbE.i2c_index);
376 		if (!bus) {
377 			nvkm_debug(&i2c->subdev, "dcb %02x no bus\n", i);
378 			continue;
379 		}
380 
381 		/* ... and a driver for it */
382 		while (drv->pad_new) {
383 			if (drv->bios == dcbE.extdev)
384 				break;
385 			drv++;
386 		}
387 
388 		if (!drv->pad_new) {
389 			nvkm_debug(&i2c->subdev, "dcb %02x drv %02x unknown\n",
390 				   i, dcbE.extdev);
391 			continue;
392 		}
393 
394 		/* find/create an instance of the driver */
395 		pad = nvkm_i2c_pad_find(i2c, NVKM_I2C_PAD_EXT(dcbE.extdev));
396 		if (!pad) {
397 			const int id = NVKM_I2C_PAD_EXT(dcbE.extdev);
398 			ret = drv->pad_new(bus, id, drv->addr, &pad);
399 			if (ret) {
400 				nvkm_error(&i2c->subdev, "dcb %02x pad, %d\n",
401 					   i, ret);
402 				nvkm_i2c_pad_del(&pad);
403 				continue;
404 			}
405 		}
406 
407 		/* create any i2c bus / aux channel required by the output */
408 		if (pad->func->aux_new_6 && dcbE.type == DCB_OUTPUT_DP) {
409 			const int id = NVKM_I2C_AUX_EXT(dcbE.extdev);
410 			struct nvkm_i2c_aux *aux = NULL;
411 			ret = pad->func->aux_new_6(pad, id, 0, &aux);
412 			if (ret) {
413 				nvkm_error(&i2c->subdev, "dcb %02x aux, %d\n",
414 					   i, ret);
415 				nvkm_i2c_aux_del(&aux);
416 			}
417 		} else
418 		if (pad->func->bus_new_4) {
419 			const int id = NVKM_I2C_BUS_EXT(dcbE.extdev);
420 			struct nvkm_i2c_bus *bus = NULL;
421 			ret = pad->func->bus_new_4(pad, id, 0, &bus);
422 			if (ret) {
423 				nvkm_error(&i2c->subdev, "dcb %02x bus, %d\n",
424 					   i, ret);
425 				nvkm_i2c_bus_del(&bus);
426 			}
427 		}
428 	}
429 
430 	return nvkm_event_init(&nvkm_i2c_intr_func, 4, i, &i2c->event);
431 }
432