1 /*
2  * Copyright 2015 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 <bskeggs@redhat.com>
23  */
24 #include "priv.h"
25 #include "agp.h"
26 
27 #include <core/option.h>
28 #include <core/pci.h>
29 #include <subdev/mc.h>
30 
31 u32
32 nvkm_pci_rd32(struct nvkm_pci *pci, u16 addr)
33 {
34 	return pci->func->rd32(pci, addr);
35 }
36 
37 void
38 nvkm_pci_wr08(struct nvkm_pci *pci, u16 addr, u8 data)
39 {
40 	pci->func->wr08(pci, addr, data);
41 }
42 
43 void
44 nvkm_pci_wr32(struct nvkm_pci *pci, u16 addr, u32 data)
45 {
46 	pci->func->wr32(pci, addr, data);
47 }
48 
49 u32
50 nvkm_pci_mask(struct nvkm_pci *pci, u16 addr, u32 mask, u32 value)
51 {
52 	u32 data = pci->func->rd32(pci, addr);
53 	pci->func->wr32(pci, addr, (data & ~mask) | value);
54 	return data;
55 }
56 
57 void
58 nvkm_pci_rom_shadow(struct nvkm_pci *pci, bool shadow)
59 {
60 	u32 data = nvkm_pci_rd32(pci, 0x0050);
61 	if (shadow)
62 		data |=  0x00000001;
63 	else
64 		data &= ~0x00000001;
65 	nvkm_pci_wr32(pci, 0x0050, data);
66 }
67 
68 static irqreturn_t
69 nvkm_pci_intr(int irq, void *arg)
70 {
71 	struct nvkm_pci *pci = arg;
72 	struct nvkm_mc *mc = pci->subdev.device->mc;
73 	bool handled = false;
74 	if (likely(mc)) {
75 		nvkm_mc_intr_unarm(mc);
76 		if (pci->msi)
77 			pci->func->msi_rearm(pci);
78 		nvkm_mc_intr(mc, &handled);
79 		nvkm_mc_intr_rearm(mc);
80 	}
81 	return handled ? IRQ_HANDLED : IRQ_NONE;
82 }
83 
84 static int
85 nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend)
86 {
87 	struct nvkm_pci *pci = nvkm_pci(subdev);
88 
89 	if (pci->irq >= 0) {
90 		free_irq(pci->irq, pci);
91 		pci->irq = -1;
92 	};
93 
94 	if (pci->agp.bridge)
95 		nvkm_agp_fini(pci);
96 
97 	return 0;
98 }
99 
100 static int
101 nvkm_pci_preinit(struct nvkm_subdev *subdev)
102 {
103 	struct nvkm_pci *pci = nvkm_pci(subdev);
104 	if (pci->agp.bridge)
105 		nvkm_agp_preinit(pci);
106 	return 0;
107 }
108 
109 static int
110 nvkm_pci_oneinit(struct nvkm_subdev *subdev)
111 {
112 	struct nvkm_pci *pci = nvkm_pci(subdev);
113 	if (pci_is_pcie(pci->pdev))
114 		return nvkm_pcie_oneinit(pci);
115 	return 0;
116 }
117 
118 static int
119 nvkm_pci_init(struct nvkm_subdev *subdev)
120 {
121 	struct nvkm_pci *pci = nvkm_pci(subdev);
122 	struct pci_dev *pdev = pci->pdev;
123 	int ret;
124 
125 	if (pci->agp.bridge) {
126 		ret = nvkm_agp_init(pci);
127 		if (ret)
128 			return ret;
129 	} else if (pci_is_pcie(pci->pdev)) {
130 		nvkm_pcie_init(pci);
131 	}
132 
133 	if (pci->func->init)
134 		pci->func->init(pci);
135 
136 	ret = request_irq(pdev->irq, nvkm_pci_intr, IRQF_SHARED, "nvkm", pci);
137 	if (ret)
138 		return ret;
139 
140 	pci->irq = pdev->irq;
141 	return ret;
142 }
143 
144 static void *
145 nvkm_pci_dtor(struct nvkm_subdev *subdev)
146 {
147 	struct nvkm_pci *pci = nvkm_pci(subdev);
148 	nvkm_agp_dtor(pci);
149 	if (pci->msi)
150 		pci_disable_msi(pci->pdev);
151 	return nvkm_pci(subdev);
152 }
153 
154 static const struct nvkm_subdev_func
155 nvkm_pci_func = {
156 	.dtor = nvkm_pci_dtor,
157 	.oneinit = nvkm_pci_oneinit,
158 	.preinit = nvkm_pci_preinit,
159 	.init = nvkm_pci_init,
160 	.fini = nvkm_pci_fini,
161 };
162 
163 int
164 nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
165 	      int index, struct nvkm_pci **ppci)
166 {
167 	struct nvkm_pci *pci;
168 
169 	if (!(pci = *ppci = kzalloc(sizeof(**ppci), GFP_KERNEL)))
170 		return -ENOMEM;
171 	nvkm_subdev_ctor(&nvkm_pci_func, device, index, &pci->subdev);
172 	pci->func = func;
173 	pci->pdev = device->func->pci(device)->pdev;
174 	pci->irq = -1;
175 	pci->pcie.speed = -1;
176 	pci->pcie.width = -1;
177 
178 	if (device->type == NVKM_DEVICE_AGP)
179 		nvkm_agp_ctor(pci);
180 
181 	switch (pci->pdev->device & 0x0ff0) {
182 	case 0x00f0:
183 	case 0x02e0:
184 		/* BR02? NFI how these would be handled yet exactly */
185 		break;
186 	default:
187 		switch (device->chipset) {
188 		case 0xaa:
189 			/* reported broken, nv also disable it */
190 			break;
191 		default:
192 			pci->msi = true;
193 			break;
194 		}
195 	}
196 
197 	pci->msi = nvkm_boolopt(device->cfgopt, "NvMSI", pci->msi);
198 	if (pci->msi && func->msi_rearm) {
199 		pci->msi = pci_enable_msi(pci->pdev) == 0;
200 		if (pci->msi)
201 			nvkm_debug(&pci->subdev, "MSI enabled\n");
202 	} else {
203 		pci->msi = false;
204 	}
205 
206 	return 0;
207 }
208