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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_vpstate.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_vpstate.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/vpstate.h>
     32 
     33 static u32
     34 nvbios_vpstate_offset(struct nvkm_bios *b)
     35 {
     36 	struct bit_entry bit_P;
     37 
     38 	if (!bit_entry(b, 'P', &bit_P)) {
     39 		if (bit_P.version == 2 && bit_P.length >= 0x3c)
     40 			return nvbios_rd32(b, bit_P.offset + 0x38);
     41 	}
     42 
     43 	return 0x0000;
     44 }
     45 
     46 int
     47 nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
     48 {
     49 	if (!h)
     50 		return -EINVAL;
     51 
     52 	h->offset = nvbios_vpstate_offset(b);
     53 	if (!h->offset)
     54 		return -ENODEV;
     55 
     56 	h->version = nvbios_rd08(b, h->offset);
     57 	switch (h->version) {
     58 	case 0x10:
     59 		h->hlen     = nvbios_rd08(b, h->offset + 0x1);
     60 		h->elen     = nvbios_rd08(b, h->offset + 0x2);
     61 		h->slen     = nvbios_rd08(b, h->offset + 0x3);
     62 		h->scount   = nvbios_rd08(b, h->offset + 0x4);
     63 		h->ecount   = nvbios_rd08(b, h->offset + 0x5);
     64 
     65 		h->base_id  = nvbios_rd08(b, h->offset + 0x0f);
     66 		if (h->hlen > 0x10)
     67 			h->boost_id = nvbios_rd08(b, h->offset + 0x10);
     68 		else
     69 			h->boost_id = 0xff;
     70 		if (h->hlen > 0x11)
     71 			h->tdp_id = nvbios_rd08(b, h->offset + 0x11);
     72 		else
     73 			h->tdp_id = 0xff;
     74 		return 0;
     75 	default:
     76 		return -EINVAL;
     77 	}
     78 }
     79 
     80 int
     81 nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
     82 		     u8 idx, struct nvbios_vpstate_entry *e)
     83 {
     84 	u32 offset;
     85 
     86 	if (!e || !h || idx > h->ecount)
     87 		return -EINVAL;
     88 
     89 	offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
     90 	e->pstate    = nvbios_rd08(b, offset);
     91 	e->clock_mhz = nvbios_rd16(b, offset + 0x5);
     92 	return 0;
     93 }
     94