1 | /* $NetBSD: nouveau_agp.c,v 1.3 2015/04/03 01:09:42 riastradh Exp $ */ |
2 | |
3 | #include <sys/cdefs.h> |
4 | __KERNEL_RCSID(0, "$NetBSD: nouveau_agp.c,v 1.3 2015/04/03 01:09:42 riastradh Exp $" ); |
5 | |
6 | #include <linux/module.h> |
7 | #include <linux/moduleparam.h> |
8 | |
9 | #include <core/device.h> |
10 | |
11 | #include "nouveau_drm.h" |
12 | #include "nouveau_agp.h" |
13 | #include "nouveau_reg.h" |
14 | |
15 | #if __OS_HAS_AGP |
16 | MODULE_PARM_DESC(agpmode, "AGP mode (0 to disable AGP)" ); |
17 | static int nouveau_agpmode = -1; |
18 | module_param_named(agpmode, nouveau_agpmode, int, 0400); |
19 | |
20 | struct nouveau_agpmode_quirk { |
21 | u16 hostbridge_vendor; |
22 | u16 hostbridge_device; |
23 | u16 chip_vendor; |
24 | u16 chip_device; |
25 | int mode; |
26 | }; |
27 | |
28 | static struct nouveau_agpmode_quirk nouveau_agpmode_quirk_list[] = { |
29 | /* VIA Apollo PRO133x / GeForce FX 5600 Ultra, max agpmode 2, fdo #20341 */ |
30 | { PCI_VENDOR_ID_VIA, 0x0691, PCI_VENDOR_ID_NVIDIA, 0x0311, 2 }, |
31 | |
32 | {}, |
33 | }; |
34 | |
35 | static unsigned long |
36 | get_agp_mode(struct nouveau_drm *drm, const struct drm_agp_info *info) |
37 | { |
38 | struct nouveau_device *device = nv_device(drm->device); |
39 | struct nouveau_agpmode_quirk *quirk = nouveau_agpmode_quirk_list; |
40 | int agpmode = nouveau_agpmode; |
41 | unsigned long mode = info->mode; |
42 | |
43 | /* |
44 | * FW seems to be broken on nv18, it makes the card lock up |
45 | * randomly. |
46 | */ |
47 | if (device->chipset == 0x18) |
48 | mode &= ~PCI_AGP_COMMAND_FW; |
49 | |
50 | /* |
51 | * Go through the quirks list and adjust the agpmode accordingly. |
52 | */ |
53 | while (agpmode == -1 && quirk->hostbridge_vendor) { |
54 | if (info->id_vendor == quirk->hostbridge_vendor && |
55 | info->id_device == quirk->hostbridge_device && |
56 | device->pdev->vendor == quirk->chip_vendor && |
57 | device->pdev->device == quirk->chip_device) { |
58 | agpmode = quirk->mode; |
59 | nv_info(device, "Forcing agp mode to %dX. Use agpmode to override.\n" , |
60 | agpmode); |
61 | break; |
62 | } |
63 | ++quirk; |
64 | } |
65 | |
66 | /* |
67 | * AGP mode set in the command line. |
68 | */ |
69 | if (agpmode > 0) { |
70 | bool agpv3 = mode & 0x8; |
71 | int rate = agpv3 ? agpmode / 4 : agpmode; |
72 | |
73 | mode = (mode & ~0x7) | (rate & 0x7); |
74 | } |
75 | |
76 | return mode; |
77 | } |
78 | |
79 | static bool |
80 | nouveau_agp_enabled(struct nouveau_drm *drm) |
81 | { |
82 | struct drm_device *dev = drm->dev; |
83 | |
84 | if (!dev->pdev || !drm_pci_device_is_agp(dev) || !dev->agp) |
85 | return false; |
86 | |
87 | if (drm->agp.stat == UNKNOWN) { |
88 | if (!nouveau_agpmode) |
89 | return false; |
90 | #ifdef __powerpc__ |
91 | /* Disable AGP by default on all PowerPC machines for |
92 | * now -- At least some UniNorth-2 AGP bridges are |
93 | * known to be broken: DMA from the host to the card |
94 | * works just fine, but writeback from the card to the |
95 | * host goes straight to memory untranslated bypassing |
96 | * the GATT somehow, making them quite painful to deal |
97 | * with... |
98 | */ |
99 | if (nouveau_agpmode == -1) |
100 | return false; |
101 | #endif |
102 | return true; |
103 | } |
104 | |
105 | return (drm->agp.stat == ENABLED); |
106 | } |
107 | #endif |
108 | |
109 | void |
110 | nouveau_agp_reset(struct nouveau_drm *drm) |
111 | { |
112 | #if __OS_HAS_AGP |
113 | struct nouveau_device *device = nv_device(drm->device); |
114 | struct drm_device *dev = drm->dev; |
115 | u32 save[2]; |
116 | int ret; |
117 | |
118 | if (!nouveau_agp_enabled(drm)) |
119 | return; |
120 | |
121 | /* First of all, disable fast writes, otherwise if it's |
122 | * already enabled in the AGP bridge and we disable the card's |
123 | * AGP controller we might be locking ourselves out of it. */ |
124 | if ((nv_rd32(device, NV04_PBUS_PCI_NV_19) | |
125 | dev->agp->mode) & PCI_AGP_COMMAND_FW) { |
126 | struct drm_agp_info info; |
127 | struct drm_agp_mode mode; |
128 | |
129 | ret = drm_agp_info(dev, &info); |
130 | if (ret) |
131 | return; |
132 | |
133 | mode.mode = get_agp_mode(drm, &info); |
134 | mode.mode &= ~PCI_AGP_COMMAND_FW; |
135 | |
136 | ret = drm_agp_enable(dev, mode); |
137 | if (ret) |
138 | return; |
139 | } |
140 | |
141 | |
142 | /* clear busmaster bit, and disable AGP */ |
143 | save[0] = nv_mask(device, NV04_PBUS_PCI_NV_1, 0x00000004, 0x00000000); |
144 | nv_wr32(device, NV04_PBUS_PCI_NV_19, 0); |
145 | |
146 | /* reset PGRAPH, PFIFO and PTIMER */ |
147 | save[1] = nv_mask(device, 0x000200, 0x00011100, 0x00000000); |
148 | nv_mask(device, 0x000200, 0x00011100, save[1]); |
149 | |
150 | /* and restore bustmaster bit (gives effect of resetting AGP) */ |
151 | nv_wr32(device, NV04_PBUS_PCI_NV_1, save[0]); |
152 | #endif |
153 | } |
154 | |
155 | void |
156 | nouveau_agp_init(struct nouveau_drm *drm) |
157 | { |
158 | #if __OS_HAS_AGP |
159 | struct nouveau_device *device = nv_device(drm->device); |
160 | struct drm_device *dev = drm->dev; |
161 | struct drm_agp_info info; |
162 | struct drm_agp_mode mode; |
163 | int ret; |
164 | |
165 | if (!nouveau_agp_enabled(drm)) |
166 | return; |
167 | drm->agp.stat = DISABLE; |
168 | |
169 | ret = drm_agp_acquire(dev); |
170 | if (ret) { |
171 | nv_error(device, "unable to acquire AGP: %d\n" , ret); |
172 | return; |
173 | } |
174 | |
175 | ret = drm_agp_info(dev, &info); |
176 | if (ret) { |
177 | nv_error(device, "unable to get AGP info: %d\n" , ret); |
178 | return; |
179 | } |
180 | |
181 | /* see agp.h for the AGPSTAT_* modes available */ |
182 | mode.mode = get_agp_mode(drm, &info); |
183 | |
184 | ret = drm_agp_enable(dev, mode); |
185 | if (ret) { |
186 | nv_error(device, "unable to enable AGP: %d\n" , ret); |
187 | return; |
188 | } |
189 | |
190 | drm->agp.stat = ENABLED; |
191 | drm->agp.base = info.aperture_base; |
192 | drm->agp.size = info.aperture_size; |
193 | #ifdef __NetBSD__ |
194 | pmap_pv_track(drm->agp.base, drm->agp.size); |
195 | #endif |
196 | #endif |
197 | } |
198 | |
199 | void |
200 | nouveau_agp_fini(struct nouveau_drm *drm) |
201 | { |
202 | #if __OS_HAS_AGP |
203 | struct drm_device *dev = drm->dev; |
204 | if (dev->agp && dev->agp->acquired) { |
205 | #ifdef __NetBSD__ |
206 | pmap_pv_untrack(drm->agp.base, drm->agp.size); |
207 | #endif |
208 | drm_agp_release(dev); |
209 | } |
210 | #endif |
211 | } |
212 | |