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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_fan.c,v 1.4 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2014 Martin Peres
      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: Martin Peres
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_fan.c,v 1.4 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include <subdev/bios.h>
     30 #include <subdev/bios/bit.h>
     31 #include <subdev/bios/fan.h>
     32 
     33 static u32
     34 nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     35 {
     36 	struct bit_entry bit_P;
     37 	u32 fan = 0;
     38 
     39 	if (!bit_entry(bios, 'P', &bit_P)) {
     40 		if (bit_P.version == 2 && bit_P.length >= 0x5c)
     41 			fan = nvbios_rd32(bios, bit_P.offset + 0x58);
     42 
     43 		if (fan) {
     44 			*ver = nvbios_rd08(bios, fan + 0);
     45 			switch (*ver) {
     46 			case 0x10:
     47 				*hdr = nvbios_rd08(bios, fan + 1);
     48 				*len = nvbios_rd08(bios, fan + 2);
     49 				*cnt = nvbios_rd08(bios, fan + 3);
     50 				return fan;
     51 			default:
     52 				break;
     53 			}
     54 		}
     55 	}
     56 
     57 	return 0;
     58 }
     59 
     60 static u32
     61 nvbios_fan_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
     62 		 u8 *cnt, u8 *len)
     63 {
     64 	u32 data = nvbios_fan_table(bios, ver, hdr, cnt, len);
     65 	if (data && idx < *cnt)
     66 		return data + *hdr + (idx * (*len));
     67 	return 0;
     68 }
     69 
     70 u32
     71 nvbios_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
     72 {
     73 	u8 ver, hdr, cnt, len;
     74 
     75 	u32 data = nvbios_fan_entry(bios, 0, &ver, &hdr, &cnt, &len);
     76 	if (data) {
     77 		u8 type = nvbios_rd08(bios, data + 0x00);
     78 		switch (type) {
     79 		case 0:
     80 			fan->type = NVBIOS_THERM_FAN_TOGGLE;
     81 			break;
     82 		case 1:
     83 		case 2:
     84 			/* TODO: Understand the difference between the two! */
     85 			fan->type = NVBIOS_THERM_FAN_PWM;
     86 			break;
     87 		default:
     88 			fan->type = NVBIOS_THERM_FAN_UNK;
     89 		}
     90 
     91 		fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
     92 		fan->min_duty = nvbios_rd08(bios, data + 0x02);
     93 		fan->max_duty = nvbios_rd08(bios, data + 0x03);
     94 
     95 		fan->pwm_freq = nvbios_rd32(bios, data + 0x0b) & 0xffffff;
     96 	}
     97 
     98 	return data;
     99 }
    100