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      1 /*	$NetBSD: nouveau_nvkm_subdev_fb_sddr2.c,v 1.4 2021/12/18 23:45:39 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2014 Roy Spliet
      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: Roy Spliet <rspliet (at) eclipso.eu>
     25  *          Ben Skeggs
     26  */
     27 #include <sys/cdefs.h>
     28 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_fb_sddr2.c,v 1.4 2021/12/18 23:45:39 riastradh Exp $");
     29 
     30 #include "ram.h"
     31 #include "priv.h"
     32 #include "ram.h"
     33 
     34 struct ramxlat {
     35 	int id;
     36 	u8 enc;
     37 };
     38 
     39 static inline int
     40 ramxlat(const struct ramxlat *xlat, int id)
     41 {
     42 	while (xlat->id >= 0) {
     43 		if (xlat->id == id)
     44 			return xlat->enc;
     45 		xlat++;
     46 	}
     47 	return -EINVAL;
     48 }
     49 
     50 static const struct ramxlat
     51 ramddr2_cl[] = {
     52 	{ 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 },
     53 	/* The following are available in some, but not all DDR2 docs */
     54 	{ 7, 7 },
     55 	{ -1 }
     56 };
     57 
     58 static const struct ramxlat
     59 ramddr2_wr[] = {
     60 	{ 2, 1 }, { 3, 2 }, { 4, 3 }, { 5, 4 }, { 6, 5 },
     61 	/* The following are available in some, but not all DDR2 docs */
     62 	{ 7, 6 },
     63 	{ -1 }
     64 };
     65 
     66 int
     67 nvkm_sddr2_calc(struct nvkm_ram *ram)
     68 {
     69 	int CL, WR, DLL = 0, ODT = 0;
     70 
     71 	switch (ram->next->bios.timing_ver) {
     72 	case 0x10:
     73 		CL  = ram->next->bios.timing_10_CL;
     74 		WR  = ram->next->bios.timing_10_WR;
     75 		DLL = !ram->next->bios.ramcfg_DLLoff;
     76 		ODT = ram->next->bios.timing_10_ODT & 3;
     77 		break;
     78 	case 0x20:
     79 		CL  = (ram->next->bios.timing[1] & 0x0000001f);
     80 		WR  = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
     81 		break;
     82 	default:
     83 		return -ENOSYS;
     84 	}
     85 
     86 	if (ram->next->bios.timing_ver == 0x20 ||
     87 	    ram->next->bios.ramcfg_timing == 0xff) {
     88 		ODT =  (ram->mr[1] & 0x004) >> 2 |
     89 		       (ram->mr[1] & 0x040) >> 5;
     90 	}
     91 
     92 	CL  = ramxlat(ramddr2_cl, CL);
     93 	WR  = ramxlat(ramddr2_wr, WR);
     94 	if (CL < 0 || WR < 0)
     95 		return -EINVAL;
     96 
     97 	ram->mr[0] &= ~0xf70;
     98 	ram->mr[0] |= (WR & 0x07) << 9;
     99 	ram->mr[0] |= (CL & 0x07) << 4;
    100 
    101 	ram->mr[1] &= ~0x045;
    102 	ram->mr[1] |= (ODT & 0x1) << 2;
    103 	ram->mr[1] |= (ODT & 0x2) << 5;
    104 	ram->mr[1] |= !DLL;
    105 	return 0;
    106 }
    107