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      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 
     30 struct priv {
     31 	struct nvkm_bios *bios;
     32 	u32 bar0;
     33 };
     34 
     35 static u32
     36 pramin_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 
     48 static void
     49 pramin_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 
     59 static void *
     60 pramin_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 
    118 const struct nvbios_source
    119 nvbios_ramin = {
    120 	.name = "PRAMIN",
    121 	.init = pramin_init,
    122 	.fini = pramin_fini,
    123 	.read = pramin_read,
    124 	.rw = true,
    125 };
    126