1/* $NetBSD: nouveau_nvkm_subdev_bios_shadowramin.c,v 1.3 2021/12/18 23:45:38 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 */ 25#include <sys/cdefs.h> 26__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_shadowramin.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $"); 27 28#include "priv.h" 29 30struct priv { 31 struct nvkm_bios *bios; 32 u32 bar0; 33}; 34 35static u32 36pramin_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios) 37{ 38 struct nvkm_device *device = bios->subdev.device; 39 u32 i; 40 if (offset + length <= 0x00100000) { 41 for (i = offset; i < offset + length; i += 4) 42 *(u32 *)&bios->data[i] = nvkm_rd32(device, 0x700000 + i); 43 return length; 44 } 45 return 0; 46} 47 48static void 49pramin_fini(void *data) 50{ 51 struct priv *priv = data; 52 if (priv) { 53 struct nvkm_device *device = priv->bios->subdev.device; 54 nvkm_wr32(device, 0x001700, priv->bar0); 55 kfree(priv); 56 } 57} 58 59static void * 60pramin_init(struct nvkm_bios *bios, const char *name) 61{ 62 struct nvkm_subdev *subdev = &bios->subdev; 63 struct nvkm_device *device = subdev->device; 64 struct priv *priv = NULL; 65 u64 addr = 0; 66 67 /* PRAMIN always potentially available prior to nv50 */ 68 if (device->card_type < NV_50) 69 return NULL; 70 71 /* we can't get the bios image pointer without PDISP */ 72 if (device->card_type >= GM100) 73 addr = nvkm_rd32(device, 0x021c04); 74 else 75 if (device->card_type >= NV_C0) 76 addr = nvkm_rd32(device, 0x022500); 77 if (addr & 0x00000001) { 78 nvkm_debug(subdev, "... display disabled\n"); 79 return ERR_PTR(-ENODEV); 80 } 81 82 /* check that the window is enabled and in vram, particularly 83 * important as we don't want to be touching vram on an 84 * uninitialised board 85 */ 86 if (device->card_type >= GV100) 87 addr = nvkm_rd32(device, 0x625f04); 88 else 89 addr = nvkm_rd32(device, 0x619f04); 90 if (!(addr & 0x00000008)) { 91 nvkm_debug(subdev, "... not enabled\n"); 92 return ERR_PTR(-ENODEV); 93 } 94 if ( (addr & 0x00000003) != 1) { 95 nvkm_debug(subdev, "... not in vram\n"); 96 return ERR_PTR(-ENODEV); 97 } 98 99 /* some alternate method inherited from xf86-video-nv... */ 100 addr = (addr & 0xffffff00) << 8; 101 if (!addr) { 102 addr = (u64)nvkm_rd32(device, 0x001700) << 16; 103 addr += 0xf0000; 104 } 105 106 /* modify bar0 PRAMIN window to cover the bios image */ 107 if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) { 108 nvkm_error(subdev, "... out of memory\n"); 109 return ERR_PTR(-ENOMEM); 110 } 111 112 priv->bios = bios; 113 priv->bar0 = nvkm_rd32(device, 0x001700); 114 nvkm_wr32(device, 0x001700, addr >> 16); 115 return priv; 116} 117 118const struct nvbios_source 119nvbios_ramin = { 120 .name = "PRAMIN", 121 .init = pramin_init, 122 .fini = pramin_fini, 123 .read = pramin_read, 124 .rw = true, 125}; 126