1/*	$NetBSD: nouveau_nvkm_subdev_mc_base.c,v 1.4 2021/12/19 11:34:45 riastradh Exp $	*/
2
3/*
4 * Copyright 2012 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs
25 */
26#include <sys/cdefs.h>
27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_mc_base.c,v 1.4 2021/12/19 11:34:45 riastradh Exp $");
28
29#include "priv.h"
30
31#include <core/option.h>
32#include <subdev/top.h>
33
34void
35nvkm_mc_unk260(struct nvkm_device *device, u32 data)
36{
37	struct nvkm_mc *mc = device->mc;
38	if (likely(mc) && mc->func->unk260)
39		mc->func->unk260(mc, data);
40}
41
42void
43nvkm_mc_intr_mask(struct nvkm_device *device, enum nvkm_devidx devidx, bool en)
44{
45	struct nvkm_mc *mc = device->mc;
46	const struct nvkm_mc_map *map;
47	if (likely(mc) && mc->func->intr_mask) {
48		u32 mask = nvkm_top_intr_mask(device, devidx);
49		for (map = mc->func->intr; !mask && map->stat; map++) {
50			if (map->unit == devidx)
51				mask = map->stat;
52		}
53		mc->func->intr_mask(mc, mask, en ? mask : 0);
54	}
55}
56
57void
58nvkm_mc_intr_unarm(struct nvkm_device *device)
59{
60	struct nvkm_mc *mc = device->mc;
61	if (likely(mc))
62		mc->func->intr_unarm(mc);
63}
64
65void
66nvkm_mc_intr_rearm(struct nvkm_device *device)
67{
68	struct nvkm_mc *mc = device->mc;
69	if (likely(mc))
70		mc->func->intr_rearm(mc);
71}
72
73static u32
74nvkm_mc_intr_stat(struct nvkm_mc *mc)
75{
76	u32 intr = mc->func->intr_stat(mc);
77	if (WARN_ON_ONCE(intr == 0xffffffff))
78		intr = 0; /* likely fallen off the bus */
79	return intr;
80}
81
82void
83nvkm_mc_intr(struct nvkm_device *device, bool *handled)
84{
85	struct nvkm_mc *mc = device->mc;
86	struct nvkm_subdev *subdev;
87	const struct nvkm_mc_map *map;
88	u32 stat, intr;
89	u64 subdevs;
90
91	if (unlikely(!mc))
92		return;
93
94	intr = nvkm_mc_intr_stat(mc);
95	stat = nvkm_top_intr(device, intr, &subdevs);
96	while (subdevs) {
97		enum nvkm_devidx subidx = __ffs64(subdevs);
98		subdev = nvkm_device_subdev(device, subidx);
99		if (subdev)
100			nvkm_subdev_intr(subdev);
101		subdevs &= ~BIT_ULL(subidx);
102	}
103
104	for (map = mc->func->intr; map->stat; map++) {
105		if (intr & map->stat) {
106			subdev = nvkm_device_subdev(device, map->unit);
107			if (subdev)
108				nvkm_subdev_intr(subdev);
109			stat &= ~map->stat;
110		}
111	}
112
113	if (stat)
114		nvkm_error(&mc->subdev, "intr %08x\n", stat);
115	*handled = intr != 0;
116
117	if (mc->func->intr_hack)
118		mc->func->intr_hack(mc, handled);
119}
120
121static u32
122nvkm_mc_reset_mask(struct nvkm_device *device, bool isauto,
123		   enum nvkm_devidx devidx)
124{
125	struct nvkm_mc *mc = device->mc;
126	const struct nvkm_mc_map *map;
127	u64 pmc_enable = 0;
128	if (likely(mc)) {
129		if (!(pmc_enable = nvkm_top_reset(device, devidx))) {
130			for (map = mc->func->reset; map && map->stat; map++) {
131				if (!isauto || !map->noauto) {
132					if (map->unit == devidx) {
133						pmc_enable = map->stat;
134						break;
135					}
136				}
137			}
138		}
139	}
140	return pmc_enable;
141}
142
143void
144nvkm_mc_reset(struct nvkm_device *device, enum nvkm_devidx devidx)
145{
146	u64 pmc_enable = nvkm_mc_reset_mask(device, true, devidx);
147	if (pmc_enable) {
148		nvkm_mask(device, 0x000200, pmc_enable, 0x00000000);
149		nvkm_mask(device, 0x000200, pmc_enable, pmc_enable);
150		nvkm_rd32(device, 0x000200);
151	}
152}
153
154void
155nvkm_mc_disable(struct nvkm_device *device, enum nvkm_devidx devidx)
156{
157	u64 pmc_enable = nvkm_mc_reset_mask(device, false, devidx);
158	if (pmc_enable)
159		nvkm_mask(device, 0x000200, pmc_enable, 0x00000000);
160}
161
162void
163nvkm_mc_enable(struct nvkm_device *device, enum nvkm_devidx devidx)
164{
165	u64 pmc_enable = nvkm_mc_reset_mask(device, false, devidx);
166	if (pmc_enable) {
167		nvkm_mask(device, 0x000200, pmc_enable, pmc_enable);
168		nvkm_rd32(device, 0x000200);
169	}
170}
171
172bool
173nvkm_mc_enabled(struct nvkm_device *device, enum nvkm_devidx devidx)
174{
175	u64 pmc_enable = nvkm_mc_reset_mask(device, false, devidx);
176
177	return (pmc_enable != 0) &&
178	       ((nvkm_rd32(device, 0x000200) & pmc_enable) == pmc_enable);
179}
180
181
182static int
183nvkm_mc_fini(struct nvkm_subdev *subdev, bool suspend)
184{
185	nvkm_mc_intr_unarm(subdev->device);
186	return 0;
187}
188
189static int
190nvkm_mc_init(struct nvkm_subdev *subdev)
191{
192	struct nvkm_mc *mc = nvkm_mc(subdev);
193	if (mc->func->init)
194		mc->func->init(mc);
195	nvkm_mc_intr_rearm(subdev->device);
196	return 0;
197}
198
199static void *
200nvkm_mc_dtor(struct nvkm_subdev *subdev)
201{
202	struct nvkm_mc *mc = nvkm_mc(subdev);
203	if (mc->func->dtor)
204		return mc->func->dtor(mc);
205	return nvkm_mc(subdev);
206}
207
208static const struct nvkm_subdev_func
209nvkm_mc = {
210	.dtor = nvkm_mc_dtor,
211	.init = nvkm_mc_init,
212	.fini = nvkm_mc_fini,
213};
214
215void
216nvkm_mc_ctor(const struct nvkm_mc_func *func, struct nvkm_device *device,
217	     int index, struct nvkm_mc *mc)
218{
219	nvkm_subdev_ctor(&nvkm_mc, device, index, &mc->subdev);
220	mc->func = func;
221}
222
223int
224nvkm_mc_new_(const struct nvkm_mc_func *func, struct nvkm_device *device,
225	     int index, struct nvkm_mc **pmc)
226{
227	struct nvkm_mc *mc;
228	if (!(mc = *pmc = kzalloc(sizeof(*mc), GFP_KERNEL)))
229		return -ENOMEM;
230	nvkm_mc_ctor(func, device, index, *pmc);
231	return 0;
232}
233