vmap.c

  1/*
  2 * Copyright 2012 Nouveau Community
  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: Martin Peres
 23 */
 24#include <subdev/bios.h>
 25#include <subdev/bios/bit.h>
 26#include <subdev/bios/vmap.h>
 27
 28u32
 29nvbios_vmap_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
 30{
 31	struct bit_entry bit_P;
 32	u32 vmap = 0;
 33
 34	if (!bit_entry(bios, 'P', &bit_P)) {
 35		if (bit_P.version == 2) {
 36			vmap = nvbios_rd32(bios, bit_P.offset + 0x20);
 37			if (vmap) {
 38				*ver = nvbios_rd08(bios, vmap + 0);
 39				switch (*ver) {
 40				case 0x10:
 41				case 0x20:
 42					*hdr = nvbios_rd08(bios, vmap + 1);
 43					*cnt = nvbios_rd08(bios, vmap + 3);
 44					*len = nvbios_rd08(bios, vmap + 2);
 45					return vmap;
 46				default:
 47					break;
 48				}
 49			}
 50		}
 51	}
 52
 53	return 0;
 54}
 55
 56u32
 57nvbios_vmap_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
 58		  struct nvbios_vmap *info)
 59{
 60	u32 vmap = nvbios_vmap_table(bios, ver, hdr, cnt, len);
 61	memset(info, 0x00, sizeof(*info));
 62	switch (!!vmap * *ver) {
 63	case 0x10:
 64		info->max0 = 0xff;
 65		info->max1 = 0xff;
 66		info->max2 = 0xff;
 67		break;
 68	case 0x20:
 69		info->max0 = nvbios_rd08(bios, vmap + 0x7);
 70		info->max1 = nvbios_rd08(bios, vmap + 0x8);
 71		if (*len >= 0xc)
 72			info->max2 = nvbios_rd08(bios, vmap + 0xc);
 73		else
 74			info->max2 = 0xff;
 75		break;
 76	}
 77	return vmap;
 78}
 79
 80u32
 81nvbios_vmap_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
 82{
 83	u8  hdr, cnt;
 84	u32 vmap = nvbios_vmap_table(bios, ver, &hdr, &cnt, len);
 85	if (vmap && idx < cnt) {
 86		vmap = vmap + hdr + (idx * *len);
 87		return vmap;
 88	}
 89	return 0;
 90}
 91
 92u32
 93nvbios_vmap_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
 94			struct nvbios_vmap_entry *info)
 95{
 96	u32 vmap = nvbios_vmap_entry(bios, idx, ver, len);
 97	memset(info, 0x00, sizeof(*info));
 98	switch (!!vmap * *ver) {
 99	case 0x10:
100		info->link   = 0xff;
101		info->min    = nvbios_rd32(bios, vmap + 0x00);
102		info->max    = nvbios_rd32(bios, vmap + 0x04);
103		info->arg[0] = nvbios_rd32(bios, vmap + 0x08);
104		info->arg[1] = nvbios_rd32(bios, vmap + 0x0c);
105		info->arg[2] = nvbios_rd32(bios, vmap + 0x10);
106		break;
107	case 0x20:
108		info->mode   = nvbios_rd08(bios, vmap + 0x00);
109		info->link   = nvbios_rd08(bios, vmap + 0x01);
110		info->min    = nvbios_rd32(bios, vmap + 0x02);
111		info->max    = nvbios_rd32(bios, vmap + 0x06);
112		info->arg[0] = nvbios_rd32(bios, vmap + 0x0a);
113		info->arg[1] = nvbios_rd32(bios, vmap + 0x0e);
114		info->arg[2] = nvbios_rd32(bios, vmap + 0x12);
115		info->arg[3] = nvbios_rd32(bios, vmap + 0x16);
116		info->arg[4] = nvbios_rd32(bios, vmap + 0x1a);
117		info->arg[5] = nvbios_rd32(bios, vmap + 0x1e);
118		break;
119	}
120	return vmap;
121}