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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_cstep.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2013 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_cstep.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/cstep.h>
     32 
     33 u32
     34 nvbios_cstepTe(struct nvkm_bios *bios,
     35 	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *xnr, u8 *xsz)
     36 {
     37 	struct bit_entry bit_P;
     38 	u32 cstep = 0;
     39 
     40 	if (!bit_entry(bios, 'P', &bit_P)) {
     41 		if (bit_P.version == 2 && bit_P.length >= 0x38)
     42 			cstep = nvbios_rd32(bios, bit_P.offset + 0x34);
     43 
     44 		if (cstep) {
     45 			*ver = nvbios_rd08(bios, cstep + 0);
     46 			switch (*ver) {
     47 			case 0x10:
     48 				*hdr = nvbios_rd08(bios, cstep + 1);
     49 				*cnt = nvbios_rd08(bios, cstep + 3);
     50 				*len = nvbios_rd08(bios, cstep + 2);
     51 				*xnr = nvbios_rd08(bios, cstep + 5);
     52 				*xsz = nvbios_rd08(bios, cstep + 4);
     53 				return cstep;
     54 			default:
     55 				break;
     56 			}
     57 		}
     58 	}
     59 
     60 	return 0;
     61 }
     62 
     63 u32
     64 nvbios_cstepEe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
     65 {
     66 	u8  cnt, len, xnr, xsz;
     67 	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
     68 	if (data && idx < cnt) {
     69 		data = data + *hdr + (idx * len);
     70 		*hdr = len;
     71 		return data;
     72 	}
     73 	return 0;
     74 }
     75 
     76 u32
     77 nvbios_cstepEp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
     78 	       struct nvbios_cstepE *info)
     79 {
     80 	u32 data = nvbios_cstepEe(bios, idx, ver, hdr);
     81 	memset(info, 0x00, sizeof(*info));
     82 	if (data) {
     83 		info->pstate = (nvbios_rd16(bios, data + 0x00) & 0x01e0) >> 5;
     84 		info->index   = nvbios_rd08(bios, data + 0x03);
     85 	}
     86 	return data;
     87 }
     88 
     89 u32
     90 nvbios_cstepEm(struct nvkm_bios *bios, u8 pstate, u8 *ver, u8 *hdr,
     91 	       struct nvbios_cstepE *info)
     92 {
     93 	u32 data, idx = 0;
     94 	while ((data = nvbios_cstepEp(bios, idx++, ver, hdr, info))) {
     95 		if (info->pstate == pstate)
     96 			break;
     97 	}
     98 	return data;
     99 }
    100 
    101 u32
    102 nvbios_cstepXe(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr)
    103 {
    104 	u8  cnt, len, xnr, xsz;
    105 	u32 data = nvbios_cstepTe(bios, ver, hdr, &cnt, &len, &xnr, &xsz);
    106 	if (data && idx < xnr) {
    107 		data = data + *hdr + (cnt * len) + (idx * xsz);
    108 		*hdr = xsz;
    109 		return data;
    110 	}
    111 	return 0;
    112 }
    113 
    114 u32
    115 nvbios_cstepXp(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
    116 	       struct nvbios_cstepX *info)
    117 {
    118 	u32 data = nvbios_cstepXe(bios, idx, ver, hdr);
    119 	memset(info, 0x00, sizeof(*info));
    120 	if (data) {
    121 		info->freq    = nvbios_rd16(bios, data + 0x00) * 1000;
    122 		info->unkn[0] = nvbios_rd08(bios, data + 0x02);
    123 		info->unkn[1] = nvbios_rd08(bios, data + 0x03);
    124 		info->voltage = nvbios_rd08(bios, data + 0x04);
    125 	}
    126 	return data;
    127 }
    128