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      1 /*	$NetBSD: nouveau_nvkm_subdev_fb_gddr5.c,v 1.3 2021/12/18 23:45:39 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 <bskeggs (at) redhat.com>
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_fb_gddr5.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $");
     28 
     29 #include "ram.h"
     30 
     31 /* binary driver only executes this path if the condition (a) is true
     32  * for any configuration (combination of rammap+ramcfg+timing) that
     33  * can be reached on a given card.  for now, we will execute the branch
     34  * unconditionally in the hope that a "false everywhere" in the bios
     35  * tables doesn't actually mean "don't touch this".
     36  */
     37 #define NOTE00(a) 1
     38 
     39 int
     40 nvkm_gddr5_calc(struct nvkm_ram *ram, bool nuts)
     41 {
     42 	int pd, lf, xd, vh, vr, vo, l3;
     43 	int WL, CL, WR, at[2], dt, ds;
     44 	int rq = ram->freq < 1000000; /* XXX */
     45 
     46 	xd = !ram->next->bios.ramcfg_DLLoff;
     47 
     48 	switch (ram->next->bios.ramcfg_ver) {
     49 	case 0x11:
     50 		pd =  ram->next->bios.ramcfg_11_01_80;
     51 		lf =  ram->next->bios.ramcfg_11_01_40;
     52 		vh =  ram->next->bios.ramcfg_11_02_10;
     53 		vr =  ram->next->bios.ramcfg_11_02_04;
     54 		vo =  ram->next->bios.ramcfg_11_06;
     55 		l3 = !ram->next->bios.ramcfg_11_07_02;
     56 		break;
     57 	default:
     58 		return -ENOSYS;
     59 	}
     60 
     61 	switch (ram->next->bios.timing_ver) {
     62 	case 0x20:
     63 		WL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
     64 		CL = (ram->next->bios.timing[1] & 0x0000001f);
     65 		WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
     66 		at[0] = ram->next->bios.timing_20_2e_c0;
     67 		at[1] = ram->next->bios.timing_20_2e_30;
     68 		dt =  ram->next->bios.timing_20_2e_03;
     69 		ds =  ram->next->bios.timing_20_2f_03;
     70 		break;
     71 	default:
     72 		return -ENOSYS;
     73 	}
     74 
     75 	if (WL < 1 || WL > 7 || CL < 5 || CL > 36 || WR < 4 || WR > 35)
     76 		return -EINVAL;
     77 	CL -= 5;
     78 	WR -= 4;
     79 
     80 	ram->mr[0] &= ~0xf7f;
     81 	ram->mr[0] |= (WR & 0x0f) << 8;
     82 	ram->mr[0] |= (CL & 0x0f) << 3;
     83 	ram->mr[0] |= (WL & 0x07) << 0;
     84 
     85 	ram->mr[1] &= ~0x0bf;
     86 	ram->mr[1] |= (xd & 0x01) << 7;
     87 	ram->mr[1] |= (at[0] & 0x03) << 4;
     88 	ram->mr[1] |= (dt & 0x03) << 2;
     89 	ram->mr[1] |= (ds & 0x03) << 0;
     90 
     91 	/* this seems wrong, alternate field used for the broadcast
     92 	 * on nuts vs non-nuts configs..  meh, it matches for now.
     93 	 */
     94 	ram->mr1_nuts = ram->mr[1];
     95 	if (nuts) {
     96 		ram->mr[1] &= ~0x030;
     97 		ram->mr[1] |= (at[1] & 0x03) << 4;
     98 	}
     99 
    100 	ram->mr[3] &= ~0x020;
    101 	ram->mr[3] |= (rq & 0x01) << 5;
    102 
    103 	ram->mr[5] &= ~0x004;
    104 	ram->mr[5] |= (l3 << 2);
    105 
    106 	if (!vo)
    107 		vo = (ram->mr[6] & 0xff0) >> 4;
    108 	if (ram->mr[6] & 0x001)
    109 		pd = 1; /* binary driver does this.. bug? */
    110 	ram->mr[6] &= ~0xff1;
    111 	ram->mr[6] |= (vo & 0xff) << 4;
    112 	ram->mr[6] |= (pd & 0x01) << 0;
    113 
    114 	if (NOTE00(vr)) {
    115 		ram->mr[7] &= ~0x300;
    116 		ram->mr[7] |= (vr & 0x03) << 8;
    117 	}
    118 	ram->mr[7] &= ~0x088;
    119 	ram->mr[7] |= (vh & 0x01) << 7;
    120 	ram->mr[7] |= (lf & 0x01) << 3;
    121 
    122 	ram->mr[8] &= ~0x003;
    123 	ram->mr[8] |= (WR & 0x10) >> 3;
    124 	ram->mr[8] |= (CL & 0x10) >> 4;
    125 	return 0;
    126 }
    127