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
35static struct nvkm_i2c_pad *
36nvkm_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
48struct nvkm_i2c_bus *
49nvkm_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
76struct nvkm_i2c_aux *
77nvkm_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
89static void
90nvkm_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
98static void
99nvkm_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
107static int
108nvkm_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
121static const struct nvkm_event_func
122nvkm_i2c_intr_func = {
123	.ctor = nvkm_i2c_intr_ctor,
124	.init = nvkm_i2c_intr_init,
125	.fini = nvkm_i2c_intr_fini,
126};
127
128static void
129nvkm_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
158static int
159nvkm_i2c_fini(struct nvkm_subdev *subdev, bool suspend)
160{
161	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
162	struct nvkm_i2c_pad *pad;
163	u32 mask;
164
165	if ((mask = (1 << i2c->func->aux) - 1), i2c->func->aux_stat) {
166		i2c->func->aux_mask(i2c, NVKM_I2C_ANY, mask, 0);
167		i2c->func->aux_stat(i2c, &mask, &mask, &mask, &mask);
168	}
169
170	list_for_each_entry(pad, &i2c->pad, head) {
171		nvkm_i2c_pad_fini(pad);
172	}
173
174	return 0;
175}
176
177static int
178nvkm_i2c_init(struct nvkm_subdev *subdev)
179{
180	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
181	struct nvkm_i2c_bus *bus;
182	struct nvkm_i2c_pad *pad;
183
184	list_for_each_entry(pad, &i2c->pad, head) {
185		nvkm_i2c_pad_init(pad);
186	}
187
188	list_for_each_entry(bus, &i2c->bus, head) {
189		nvkm_i2c_bus_init(bus);
190	}
191
192	return 0;
193}
194
195static void *
196nvkm_i2c_dtor(struct nvkm_subdev *subdev)
197{
198	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
199
200	nvkm_event_fini(&i2c->event);
201
202	while (!list_empty(&i2c->aux)) {
203		struct nvkm_i2c_aux *aux =
204			list_first_entry(&i2c->aux, typeof(*aux), head);
205		nvkm_i2c_aux_del(&aux);
206	}
207
208	while (!list_empty(&i2c->bus)) {
209		struct nvkm_i2c_bus *bus =
210			list_first_entry(&i2c->bus, typeof(*bus), head);
211		nvkm_i2c_bus_del(&bus);
212	}
213
214	while (!list_empty(&i2c->pad)) {
215		struct nvkm_i2c_pad *pad =
216			list_first_entry(&i2c->pad, typeof(*pad), head);
217		nvkm_i2c_pad_del(&pad);
218	}
219
220	return i2c;
221}
222
223static const struct nvkm_subdev_func
224nvkm_i2c = {
225	.dtor = nvkm_i2c_dtor,
226	.init = nvkm_i2c_init,
227	.fini = nvkm_i2c_fini,
228	.intr = nvkm_i2c_intr,
229};
230
231static const struct nvkm_i2c_drv {
232	u8 bios;
233	u8 addr;
234	int (*pad_new)(struct nvkm_i2c_bus *, int id, u8 addr,
235		       struct nvkm_i2c_pad **);
236}
237nvkm_i2c_drv[] = {
238	{ 0x0d, 0x39, anx9805_pad_new },
239	{ 0x0e, 0x3b, anx9805_pad_new },
240	{}
241};
242
243int
244nvkm_i2c_new_(const struct nvkm_i2c_func *func, struct nvkm_device *device,
245	      int index, struct nvkm_i2c **pi2c)
246{
247	struct nvkm_bios *bios = device->bios;
248	struct nvkm_i2c *i2c;
249	struct dcb_i2c_entry ccbE;
250	struct dcb_output dcbE;
251	u8 ver, hdr;
252	int ret, i;
253
254	if (!(i2c = *pi2c = kzalloc(sizeof(*i2c), GFP_KERNEL)))
255		return -ENOMEM;
256
257	nvkm_subdev_ctor(&nvkm_i2c, device, index, 0, &i2c->subdev);
258	i2c->func = func;
259	INIT_LIST_HEAD(&i2c->pad);
260	INIT_LIST_HEAD(&i2c->bus);
261	INIT_LIST_HEAD(&i2c->aux);
262
263	i = -1;
264	while (!dcb_i2c_parse(bios, ++i, &ccbE)) {
265		struct nvkm_i2c_pad *pad = NULL;
266		struct nvkm_i2c_bus *bus = NULL;
267		struct nvkm_i2c_aux *aux = NULL;
268
269		nvkm_debug(&i2c->subdev, "ccb %02x: type %02x drive %02x "
270			   "sense %02x share %02x auxch %02x\n", i, ccbE.type,
271			   ccbE.drive, ccbE.sense, ccbE.share, ccbE.auxch);
272
273		if (ccbE.share != DCB_I2C_UNUSED) {
274			const int id = NVKM_I2C_PAD_HYBRID(ccbE.share);
275			if (!(pad = nvkm_i2c_pad_find(i2c, id)))
276				ret = func->pad_s_new(i2c, id, &pad);
277			else
278				ret = 0;
279		} else {
280			ret = func->pad_x_new(i2c, NVKM_I2C_PAD_CCB(i), &pad);
281		}
282
283		if (ret) {
284			nvkm_error(&i2c->subdev, "ccb %02x pad, %d\n", i, ret);
285			nvkm_i2c_pad_del(&pad);
286			continue;
287		}
288
289		if (pad->func->bus_new_0 && ccbE.type == DCB_I2C_NV04_BIT) {
290			ret = pad->func->bus_new_0(pad, NVKM_I2C_BUS_CCB(i),
291						   ccbE.drive,
292						   ccbE.sense, &bus);
293		} else
294		if (pad->func->bus_new_4 &&
295		    ( ccbE.type == DCB_I2C_NV4E_BIT ||
296		      ccbE.type == DCB_I2C_NVIO_BIT ||
297		     (ccbE.type == DCB_I2C_PMGR &&
298		      ccbE.drive != DCB_I2C_UNUSED))) {
299			ret = pad->func->bus_new_4(pad, NVKM_I2C_BUS_CCB(i),
300						   ccbE.drive, &bus);
301		}
302
303		if (ret) {
304			nvkm_error(&i2c->subdev, "ccb %02x bus, %d\n", i, ret);
305			nvkm_i2c_bus_del(&bus);
306		}
307
308		if (pad->func->aux_new_6 &&
309		    ( ccbE.type == DCB_I2C_NVIO_AUX ||
310		     (ccbE.type == DCB_I2C_PMGR &&
311		      ccbE.auxch != DCB_I2C_UNUSED))) {
312			ret = pad->func->aux_new_6(pad, NVKM_I2C_BUS_CCB(i),
313						   ccbE.auxch, &aux);
314		} else {
315			ret = 0;
316		}
317
318		if (ret) {
319			nvkm_error(&i2c->subdev, "ccb %02x aux, %d\n", i, ret);
320			nvkm_i2c_aux_del(&aux);
321		}
322
323		if (ccbE.type != DCB_I2C_UNUSED && !bus && !aux) {
324			nvkm_warn(&i2c->subdev, "ccb %02x was ignored\n", i);
325			continue;
326		}
327	}
328
329	i = -1;
330	while (dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE)) {
331		const struct nvkm_i2c_drv *drv = nvkm_i2c_drv;
332		struct nvkm_i2c_bus *bus;
333		struct nvkm_i2c_pad *pad;
334
335		/* internal outputs handled by native i2c busses (above) */
336		if (!dcbE.location)
337			continue;
338
339		/* we need an i2c bus to talk to the external encoder */
340		bus = nvkm_i2c_bus_find(i2c, dcbE.i2c_index);
341		if (!bus) {
342			nvkm_debug(&i2c->subdev, "dcb %02x no bus\n", i);
343			continue;
344		}
345
346		/* ... and a driver for it */
347		while (drv->pad_new) {
348			if (drv->bios == dcbE.extdev)
349				break;
350			drv++;
351		}
352
353		if (!drv->pad_new) {
354			nvkm_debug(&i2c->subdev, "dcb %02x drv %02x unknown\n",
355				   i, dcbE.extdev);
356			continue;
357		}
358
359		/* find/create an instance of the driver */
360		pad = nvkm_i2c_pad_find(i2c, NVKM_I2C_PAD_EXT(dcbE.extdev));
361		if (!pad) {
362			const int id = NVKM_I2C_PAD_EXT(dcbE.extdev);
363			ret = drv->pad_new(bus, id, drv->addr, &pad);
364			if (ret) {
365				nvkm_error(&i2c->subdev, "dcb %02x pad, %d\n",
366					   i, ret);
367				nvkm_i2c_pad_del(&pad);
368				continue;
369			}
370		}
371
372		/* create any i2c bus / aux channel required by the output */
373		if (pad->func->aux_new_6 && dcbE.type == DCB_OUTPUT_DP) {
374			const int id = NVKM_I2C_AUX_EXT(dcbE.extdev);
375			struct nvkm_i2c_aux *aux = NULL;
376			ret = pad->func->aux_new_6(pad, id, 0, &aux);
377			if (ret) {
378				nvkm_error(&i2c->subdev, "dcb %02x aux, %d\n",
379					   i, ret);
380				nvkm_i2c_aux_del(&aux);
381			}
382		} else
383		if (pad->func->bus_new_4) {
384			const int id = NVKM_I2C_BUS_EXT(dcbE.extdev);
385			struct nvkm_i2c_bus *bus = NULL;
386			ret = pad->func->bus_new_4(pad, id, 0, &bus);
387			if (ret) {
388				nvkm_error(&i2c->subdev, "dcb %02x bus, %d\n",
389					   i, ret);
390				nvkm_i2c_bus_del(&bus);
391			}
392		}
393	}
394
395	return nvkm_event_init(&nvkm_i2c_intr_func, 4, i, &i2c->event);
396}
397