cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowramin.c

/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */
#include "priv.h"


struct priv {
	
struct nvkm_bios *bios;
	
u32 bar0;
};


static u32 pramin_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios) { struct nvkm_device *device = bios->subdev.device; u32 i; if (offset + length <= 0x00100000) { for (i = offset; i < offset + length; i += 4) *(u32 *)&bios->data[i] = nvkm_rd32(device, 0x700000 + i); return length; } return 0; }

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static void pramin_fini(void *data) { struct priv *priv = data; if (priv) { struct nvkm_device *device = priv->bios->subdev.device; nvkm_wr32(device, 0x001700, priv->bar0); kfree(priv); } }

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static void * pramin_init(struct nvkm_bios *bios, const char *name) { struct nvkm_subdev *subdev = &bios->subdev; struct nvkm_device *device = subdev->device; struct priv *priv = NULL; u64 addr = 0; /* PRAMIN always potentially available prior to nv50 */ if (device->card_type < NV_50) return NULL; /* we can't get the bios image pointer without PDISP */ if (device->card_type >= GM100) addr = nvkm_rd32(device, 0x021c04); else if (device->card_type >= NV_C0) addr = nvkm_rd32(device, 0x022500); if (addr & 0x00000001) { nvkm_debug(subdev, "... display disabled\n"); return ERR_PTR(-ENODEV); } /* check that the window is enabled and in vram, particularly * important as we don't want to be touching vram on an * uninitialised board */ addr = nvkm_rd32(device, 0x619f04); if (!(addr & 0x00000008)) { nvkm_debug(subdev, "... not enabled\n"); return ERR_PTR(-ENODEV); } if ( (addr & 0x00000003) != 1) { nvkm_debug(subdev, "... not in vram\n"); return ERR_PTR(-ENODEV); } /* some alternate method inherited from xf86-video-nv... */ addr = (addr & 0xffffff00) << 8; if (!addr) { addr = (u64)nvkm_rd32(device, 0x001700) << 16; addr += 0xf0000; } /* modify bar0 PRAMIN window to cover the bios image */ if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) { nvkm_error(subdev, "... out of memory\n"); return ERR_PTR(-ENOMEM); } priv->bios = bios; priv->bar0 = nvkm_rd32(device, 0x001700); nvkm_wr32(device, 0x001700, addr >> 16); return priv; }

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const struct nvbios_source nvbios_ramin = { .name = "PRAMIN", .init = pramin_init, .fini = pramin_fini, .read = pramin_read, .rw = true, };

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Ben Skeggs471100.00%5100.00%
Total471100.00%5100.00%
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