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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_conn.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 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_conn.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include <subdev/bios.h>
     30 #include <subdev/bios/dcb.h>
     31 #include <subdev/bios/conn.h>
     32 
     33 u32
     34 nvbios_connTe(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     35 {
     36 	u32 dcb = dcb_table(bios, ver, hdr, cnt, len);
     37 	if (dcb && *ver >= 0x30 && *hdr >= 0x16) {
     38 		u32 data = nvbios_rd16(bios, dcb + 0x14);
     39 		if (data) {
     40 			*ver = nvbios_rd08(bios, data + 0);
     41 			*hdr = nvbios_rd08(bios, data + 1);
     42 			*cnt = nvbios_rd08(bios, data + 2);
     43 			*len = nvbios_rd08(bios, data + 3);
     44 			return data;
     45 		}
     46 	}
     47 	return 0x00000000;
     48 }
     49 
     50 u32
     51 nvbios_connTp(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
     52 	      struct nvbios_connT *info)
     53 {
     54 	u32 data = nvbios_connTe(bios, ver, hdr, cnt, len);
     55 	memset(info, 0x00, sizeof(*info));
     56 	switch (!!data * *ver) {
     57 	case 0x30:
     58 	case 0x40:
     59 		return data;
     60 	default:
     61 		break;
     62 	}
     63 	return 0x00000000;
     64 }
     65 
     66 u32
     67 nvbios_connEe(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
     68 {
     69 	u8  hdr, cnt;
     70 	u32 data = nvbios_connTe(bios, ver, &hdr, &cnt, len);
     71 	if (data && idx < cnt)
     72 		return data + hdr + (idx * *len);
     73 	return 0x00000000;
     74 }
     75 
     76 u32
     77 nvbios_connEp(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len,
     78 	      struct nvbios_connE *info)
     79 {
     80 	u32 data = nvbios_connEe(bios, idx, ver, len);
     81 	memset(info, 0x00, sizeof(*info));
     82 	switch (!!data * *ver) {
     83 	case 0x30:
     84 	case 0x40:
     85 		info->type     =  nvbios_rd08(bios, data + 0x00);
     86 		info->location =  nvbios_rd08(bios, data + 0x01) & 0x0f;
     87 		info->hpd      = (nvbios_rd08(bios, data + 0x01) & 0x30) >> 4;
     88 		info->dp       = (nvbios_rd08(bios, data + 0x01) & 0xc0) >> 6;
     89 		if (*len < 4)
     90 			return data;
     91 		info->hpd     |= (nvbios_rd08(bios, data + 0x02) & 0x03) << 2;
     92 		info->dp      |=  nvbios_rd08(bios, data + 0x02) & 0x0c;
     93 		info->di       = (nvbios_rd08(bios, data + 0x02) & 0xf0) >> 4;
     94 		info->hpd     |= (nvbios_rd08(bios, data + 0x03) & 0x07) << 4;
     95 		info->sr       = (nvbios_rd08(bios, data + 0x03) & 0x08) >> 3;
     96 		info->lcdid    = (nvbios_rd08(bios, data + 0x03) & 0x70) >> 4;
     97 		return data;
     98 	default:
     99 		break;
    100 	}
    101 	return 0x00000000;
    102 }
    103