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_device *device = pci->subdev.device;
73 	bool handled = false;
74 	nvkm_mc_intr_unarm(device);
75 	if (pci->msi)
76 		pci->func->msi_rearm(pci);
77 	nvkm_mc_intr(device, &handled);
78 	nvkm_mc_intr_rearm(device);
79 	return handled ? IRQ_HANDLED : IRQ_NONE;
80 }
81 
82 static int
83 nvkm_pci_fini(struct nvkm_subdev *subdev, bool suspend)
84 {
85 	struct nvkm_pci *pci = nvkm_pci(subdev);
86 
87 	if (pci->irq >= 0) {
88 		free_irq(pci->irq, pci);
89 		pci->irq = -1;
90 	};
91 
92 	if (pci->agp.bridge)
93 		nvkm_agp_fini(pci);
94 
95 	return 0;
96 }
97 
98 static int
99 nvkm_pci_preinit(struct nvkm_subdev *subdev)
100 {
101 	struct nvkm_pci *pci = nvkm_pci(subdev);
102 	if (pci->agp.bridge)
103 		nvkm_agp_preinit(pci);
104 	return 0;
105 }
106 
107 static int
108 nvkm_pci_oneinit(struct nvkm_subdev *subdev)
109 {
110 	struct nvkm_pci *pci = nvkm_pci(subdev);
111 	if (pci_is_pcie(pci->pdev))
112 		return nvkm_pcie_oneinit(pci);
113 	return 0;
114 }
115 
116 static int
117 nvkm_pci_init(struct nvkm_subdev *subdev)
118 {
119 	struct nvkm_pci *pci = nvkm_pci(subdev);
120 	struct pci_dev *pdev = pci->pdev;
121 	int ret;
122 
123 	if (pci->agp.bridge) {
124 		ret = nvkm_agp_init(pci);
125 		if (ret)
126 			return ret;
127 	} else if (pci_is_pcie(pci->pdev)) {
128 		nvkm_pcie_init(pci);
129 	}
130 
131 	if (pci->func->init)
132 		pci->func->init(pci);
133 
134 	ret = request_irq(pdev->irq, nvkm_pci_intr, IRQF_SHARED, "nvkm", pci);
135 	if (ret)
136 		return ret;
137 
138 	pci->irq = pdev->irq;
139 	return ret;
140 }
141 
142 static void *
143 nvkm_pci_dtor(struct nvkm_subdev *subdev)
144 {
145 	struct nvkm_pci *pci = nvkm_pci(subdev);
146 	nvkm_agp_dtor(pci);
147 	if (pci->msi)
148 		pci_disable_msi(pci->pdev);
149 	return nvkm_pci(subdev);
150 }
151 
152 static const struct nvkm_subdev_func
153 nvkm_pci_func = {
154 	.dtor = nvkm_pci_dtor,
155 	.oneinit = nvkm_pci_oneinit,
156 	.preinit = nvkm_pci_preinit,
157 	.init = nvkm_pci_init,
158 	.fini = nvkm_pci_fini,
159 };
160 
161 int
162 nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
163 	      int index, struct nvkm_pci **ppci)
164 {
165 	struct nvkm_pci *pci;
166 
167 	if (!(pci = *ppci = kzalloc(sizeof(**ppci), GFP_KERNEL)))
168 		return -ENOMEM;
169 	nvkm_subdev_ctor(&nvkm_pci_func, device, index, &pci->subdev);
170 	pci->func = func;
171 	pci->pdev = device->func->pci(device)->pdev;
172 	pci->irq = -1;
173 	pci->pcie.speed = -1;
174 	pci->pcie.width = -1;
175 
176 	if (device->type == NVKM_DEVICE_AGP)
177 		nvkm_agp_ctor(pci);
178 
179 	switch (pci->pdev->device & 0x0ff0) {
180 	case 0x00f0:
181 	case 0x02e0:
182 		/* BR02? NFI how these would be handled yet exactly */
183 		break;
184 	default:
185 		switch (device->chipset) {
186 		case 0xaa:
187 			/* reported broken, nv also disable it */
188 			break;
189 		default:
190 			pci->msi = true;
191 			break;
192 		}
193 	}
194 
195 	pci->msi = nvkm_boolopt(device->cfgopt, "NvMSI", pci->msi);
196 	if (pci->msi && func->msi_rearm) {
197 		pci->msi = pci_enable_msi(pci->pdev) == 0;
198 		if (pci->msi)
199 			nvkm_debug(&pci->subdev, "MSI enabled\n");
200 	} else {
201 		pci->msi = false;
202 	}
203 
204 	return 0;
205 }
206