1/*
2 * Copyright 2012 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
26#include <core/device.h>
27#include <core/option.h>
28
29static inline void
30nvkm_mc_unk260(struct nvkm_mc *pmc, u32 data)
31{
32	const struct nvkm_mc_oclass *impl = (void *)nv_oclass(pmc);
33	if (impl->unk260)
34		impl->unk260(pmc, data);
35}
36
37static inline u32
38nvkm_mc_intr_mask(struct nvkm_mc *pmc)
39{
40	u32 intr = nv_rd32(pmc, 0x000100);
41	if (intr == 0xffffffff) /* likely fallen off the bus */
42		intr = 0x00000000;
43	return intr;
44}
45
46static irqreturn_t
47nvkm_mc_intr(int irq, void *arg)
48{
49	struct nvkm_mc *pmc = arg;
50	const struct nvkm_mc_oclass *oclass = (void *)nv_object(pmc)->oclass;
51	const struct nvkm_mc_intr *map = oclass->intr;
52	struct nvkm_subdev *unit;
53	u32 intr;
54
55	nv_wr32(pmc, 0x000140, 0x00000000);
56	nv_rd32(pmc, 0x000140);
57	intr = nvkm_mc_intr_mask(pmc);
58	if (pmc->use_msi)
59		oclass->msi_rearm(pmc);
60
61	if (intr) {
62		u32 stat = intr = nvkm_mc_intr_mask(pmc);
63		while (map->stat) {
64			if (intr & map->stat) {
65				unit = nvkm_subdev(pmc, map->unit);
66				if (unit && unit->intr)
67					unit->intr(unit);
68				stat &= ~map->stat;
69			}
70			map++;
71		}
72
73		if (stat)
74			nv_error(pmc, "unknown intr 0x%08x\n", stat);
75	}
76
77	nv_wr32(pmc, 0x000140, 0x00000001);
78	return intr ? IRQ_HANDLED : IRQ_NONE;
79}
80
81int
82_nvkm_mc_fini(struct nvkm_object *object, bool suspend)
83{
84	struct nvkm_mc *pmc = (void *)object;
85	nv_wr32(pmc, 0x000140, 0x00000000);
86	return nvkm_subdev_fini(&pmc->base, suspend);
87}
88
89int
90_nvkm_mc_init(struct nvkm_object *object)
91{
92	struct nvkm_mc *pmc = (void *)object;
93	int ret = nvkm_subdev_init(&pmc->base);
94	if (ret)
95		return ret;
96	nv_wr32(pmc, 0x000140, 0x00000001);
97	return 0;
98}
99
100void
101_nvkm_mc_dtor(struct nvkm_object *object)
102{
103	struct nvkm_device *device = nv_device(object);
104	struct nvkm_mc *pmc = (void *)object;
105	free_irq(pmc->irq, pmc);
106	if (pmc->use_msi)
107		pci_disable_msi(device->pdev);
108	nvkm_subdev_destroy(&pmc->base);
109}
110
111int
112nvkm_mc_create_(struct nvkm_object *parent, struct nvkm_object *engine,
113		struct nvkm_oclass *bclass, int length, void **pobject)
114{
115	const struct nvkm_mc_oclass *oclass = (void *)bclass;
116	struct nvkm_device *device = nv_device(parent);
117	struct nvkm_mc *pmc;
118	int ret;
119
120	ret = nvkm_subdev_create_(parent, engine, bclass, 0, "PMC",
121				  "master", length, pobject);
122	pmc = *pobject;
123	if (ret)
124		return ret;
125
126	pmc->unk260 = nvkm_mc_unk260;
127
128	if (nv_device_is_pci(device)) {
129		switch (device->pdev->device & 0x0ff0) {
130		case 0x00f0:
131		case 0x02e0:
132			/* BR02? NFI how these would be handled yet exactly */
133			break;
134		default:
135			switch (device->chipset) {
136			case 0xaa:
137				/* reported broken, nv also disable it */
138				break;
139			default:
140				pmc->use_msi = true;
141				break;
142			}
143		}
144
145		pmc->use_msi = nvkm_boolopt(device->cfgopt, "NvMSI",
146					    pmc->use_msi);
147
148		if (pmc->use_msi && oclass->msi_rearm) {
149			pmc->use_msi = pci_enable_msi(device->pdev) == 0;
150			if (pmc->use_msi) {
151				nv_info(pmc, "MSI interrupts enabled\n");
152				oclass->msi_rearm(pmc);
153			}
154		} else {
155			pmc->use_msi = false;
156		}
157	}
158
159	ret = nv_device_get_irq(device, true);
160	if (ret < 0)
161		return ret;
162	pmc->irq = ret;
163
164	ret = request_irq(pmc->irq, nvkm_mc_intr, IRQF_SHARED, "nvkm", pmc);
165	if (ret < 0)
166		return ret;
167
168	return 0;
169}
170