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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_M0203.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2014 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  * Authors: Ben Skeggs
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_M0203.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include <subdev/bios.h>
     30 #include <subdev/bios/bit.h>
     31 #include <subdev/bios/M0203.h>
     32 
     33 u32
     34 nvbios_M0203Te(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     35 {
     36 	struct bit_entry bit_M;
     37 	u32 data = 0x00000000;
     38 
     39 	if (!bit_entry(bios, 'M', &bit_M)) {
     40 		if (bit_M.version == 2 && bit_M.length > 0x04)
     41 			data = nvbios_rd16(bios, bit_M.offset + 0x03);
     42 		if (data) {
     43 			*ver = nvbios_rd08(bios, data + 0x00);
     44 			switch (*ver) {
     45 			case 0x10:
     46 				*hdr = nvbios_rd08(bios, data + 0x01);
     47 				*len = nvbios_rd08(bios, data + 0x02);
     48 				*cnt = nvbios_rd08(bios, data + 0x03);
     49 				return data;
     50 			default:
     51 				break;
     52 			}
     53 		}
     54 	}
     55 
     56 	return 0x00000000;
     57 }
     58 
     59 u32
     60 nvbios_M0203Tp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
     61 	       struct nvbios_M0203T *info)
     62 {
     63 	u32 data = nvbios_M0203Te(bios, ver, hdr, cnt, len);
     64 	memset(info, 0x00, sizeof(*info));
     65 	switch (!!data * *ver) {
     66 	case 0x10:
     67 		info->type    = nvbios_rd08(bios, data + 0x04);
     68 		info->pointer = nvbios_rd16(bios, data + 0x05);
     69 		break;
     70 	default:
     71 		break;
     72 	}
     73 	return data;
     74 }
     75 
     76 u32
     77 nvbios_M0203Ee(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
     78 {
     79 	u8  cnt, len;
     80 	u32 data = nvbios_M0203Te(bios, ver, hdr, &cnt, &len);
     81 	if (data && idx < cnt) {
     82 		data = data + *hdr + idx * len;
     83 		*hdr = len;
     84 		return data;
     85 	}
     86 	return 0x00000000;
     87 }
     88 
     89 u32
     90 nvbios_M0203Ep(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
     91 	       struct nvbios_M0203E *info)
     92 {
     93 	u32 data = nvbios_M0203Ee(bios, idx, ver, hdr);
     94 	memset(info, 0x00, sizeof(*info));
     95 	switch (!!data * *ver) {
     96 	case 0x10:
     97 		info->type  = (nvbios_rd08(bios, data + 0x00) & 0x0f) >> 0;
     98 		info->strap = (nvbios_rd08(bios, data + 0x00) & 0xf0) >> 4;
     99 		info->group = (nvbios_rd08(bios, data + 0x01) & 0x0f) >> 0;
    100 		return data;
    101 	default:
    102 		break;
    103 	}
    104 	return 0x00000000;
    105 }
    106 
    107 u32
    108 nvbios_M0203Em(struct nvkm_bios *bios, u8 ramcfg, u8 *ver, u8 *hdr,
    109 	       struct nvbios_M0203E *info)
    110 {
    111 	struct nvkm_subdev *subdev = &bios->subdev;
    112 	struct nvbios_M0203T M0203T;
    113 	u8  cnt, len, idx = 0xff;
    114 	u32 data;
    115 
    116 	if (!nvbios_M0203Tp(bios, ver, hdr, &cnt, &len, &M0203T)) {
    117 		nvkm_warn(subdev, "M0203T not found\n");
    118 		return 0x00000000;
    119 	}
    120 
    121 	while ((data = nvbios_M0203Ep(bios, ++idx, ver, hdr, info))) {
    122 		switch (M0203T.type) {
    123 		case M0203T_TYPE_RAMCFG:
    124 			if (info->strap != ramcfg)
    125 				continue;
    126 			return data;
    127 		default:
    128 			nvkm_warn(subdev, "M0203T type %02x\n", M0203T.type);
    129 			return 0x00000000;
    130 		}
    131 	}
    132 
    133 	return data;
    134 }
    135