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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_power_budget.c,v 1.2 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2016 Karol Herbst
      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: Karol Herbst
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_power_budget.c,v 1.2 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include <subdev/bios.h>
     30 #include <subdev/bios/bit.h>
     31 #include <subdev/bios/power_budget.h>
     32 
     33 static u32
     34 nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
     35 			  u8 *len)
     36 {
     37 	struct bit_entry bit_P;
     38 	u32 power_budget;
     39 
     40 	if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
     41 	    bit_P.length < 0x30)
     42 		return 0;
     43 
     44 	power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
     45 	if (!power_budget)
     46 		return 0;
     47 
     48 	*ver = nvbios_rd08(bios, power_budget);
     49 	switch (*ver) {
     50 	case 0x20:
     51 	case 0x30:
     52 		*hdr = nvbios_rd08(bios, power_budget + 0x1);
     53 		*len = nvbios_rd08(bios, power_budget + 0x2);
     54 		*cnt = nvbios_rd08(bios, power_budget + 0x3);
     55 		return power_budget;
     56 	default:
     57 		break;
     58 	}
     59 
     60 	return 0;
     61 }
     62 
     63 int
     64 nvbios_power_budget_header(struct nvkm_bios *bios,
     65                            struct nvbios_power_budget *budget)
     66 {
     67 	struct nvkm_subdev *subdev = &bios->subdev;
     68 	u8 ver, hdr, cnt, len, cap_entry;
     69 	u32 header;
     70 
     71 	if (!bios || !budget)
     72 		return -EINVAL;
     73 
     74 	header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
     75 	if (!header || !cnt)
     76 		return -ENODEV;
     77 
     78 	switch (ver) {
     79 	case 0x20:
     80 		cap_entry = nvbios_rd08(bios, header + 0x9);
     81 		break;
     82 	case 0x30:
     83 		cap_entry = nvbios_rd08(bios, header + 0xa);
     84 		break;
     85 	default:
     86 		cap_entry = 0xff;
     87 	}
     88 
     89 	if (cap_entry >= cnt && cap_entry != 0xff) {
     90 		nvkm_warn(subdev,
     91 		          "invalid cap_entry in power budget table found\n");
     92 		budget->cap_entry = 0xff;
     93 		return -EINVAL;
     94 	}
     95 
     96 	budget->offset = header;
     97 	budget->ver = ver;
     98 	budget->hlen = hdr;
     99 	budget->elen = len;
    100 	budget->ecount = cnt;
    101 
    102 	budget->cap_entry = cap_entry;
    103 
    104 	return 0;
    105 }
    106 
    107 int
    108 nvbios_power_budget_entry(struct nvkm_bios *bios,
    109                           struct nvbios_power_budget *budget,
    110                           u8 idx, struct nvbios_power_budget_entry *entry)
    111 {
    112 	u32 entry_offset;
    113 
    114 	if (!bios || !budget || !budget->offset || idx >= budget->ecount
    115 		|| !entry)
    116 		return -EINVAL;
    117 
    118 	entry_offset = budget->offset + budget->hlen + idx * budget->elen;
    119 
    120 	if (budget->ver >= 0x20) {
    121 		entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
    122 		entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
    123 		entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
    124 	} else {
    125 		entry->min_w = 0;
    126 		entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
    127 		entry->avg_w = entry->max_w;
    128 	}
    129 
    130 	return 0;
    131 }
    132