gddr5.c

  1/*
  2 * Copyright 2013 Red Hat Inc.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 *
 22 * Authors: Ben Skeggs <bskeggs@redhat.com>
 23 */
 24#include "ram.h"
 25
 26/* binary driver only executes this path if the condition (a) is true
 27 * for any configuration (combination of rammap+ramcfg+timing) that
 28 * can be reached on a given card.  for now, we will execute the branch
 29 * unconditionally in the hope that a "false everywhere" in the bios
 30 * tables doesn't actually mean "don't touch this".
 31 */
 32#define NOTE00(a) 1
 33
 34int
 35nvkm_gddr5_calc(struct nvkm_ram *ram, bool nuts)
 36{
 37	int pd, lf, xd, vh, vr, vo, l3;
 38	int WL, CL, WR, at[2], dt, ds;
 39	int rq = ram->freq < 1000000; /* XXX */
 40
 41	xd = !ram->next->bios.ramcfg_DLLoff;
 42
 43	switch (ram->next->bios.ramcfg_ver) {
 44	case 0x11:
 45		pd =  ram->next->bios.ramcfg_11_01_80;
 46		lf =  ram->next->bios.ramcfg_11_01_40;
 47		vh =  ram->next->bios.ramcfg_11_02_10;
 48		vr =  ram->next->bios.ramcfg_11_02_04;
 49		vo =  ram->next->bios.ramcfg_11_06;
 50		l3 = !ram->next->bios.ramcfg_11_07_02;
 51		break;
 52	default:
 53		return -ENOSYS;
 54	}
 55
 56	switch (ram->next->bios.timing_ver) {
 57	case 0x20:
 58		WL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
 59		CL = (ram->next->bios.timing[1] & 0x0000001f);
 60		WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
 61		at[0] = ram->next->bios.timing_20_2e_c0;
 62		at[1] = ram->next->bios.timing_20_2e_30;
 63		dt =  ram->next->bios.timing_20_2e_03;
 64		ds =  ram->next->bios.timing_20_2f_03;
 65		break;
 66	default:
 67		return -ENOSYS;
 68	}
 69
 70	if (WL < 1 || WL > 7 || CL < 5 || CL > 36 || WR < 4 || WR > 35)
 71		return -EINVAL;
 72	CL -= 5;
 73	WR -= 4;
 74
 75	ram->mr[0] &= ~0xf7f;
 76	ram->mr[0] |= (WR & 0x0f) << 8;
 77	ram->mr[0] |= (CL & 0x0f) << 3;
 78	ram->mr[0] |= (WL & 0x07) << 0;
 79
 80	ram->mr[1] &= ~0x0bf;
 81	ram->mr[1] |= (xd & 0x01) << 7;
 82	ram->mr[1] |= (at[0] & 0x03) << 4;
 83	ram->mr[1] |= (dt & 0x03) << 2;
 84	ram->mr[1] |= (ds & 0x03) << 0;
 85
 86	/* this seems wrong, alternate field used for the broadcast
 87	 * on nuts vs non-nuts configs..  meh, it matches for now.
 88	 */
 89	ram->mr1_nuts = ram->mr[1];
 90	if (nuts) {
 91		ram->mr[1] &= ~0x030;
 92		ram->mr[1] |= (at[1] & 0x03) << 4;
 93	}
 94
 95	ram->mr[3] &= ~0x020;
 96	ram->mr[3] |= (rq & 0x01) << 5;
 97
 98	ram->mr[5] &= ~0x004;
 99	ram->mr[5] |= (l3 << 2);
100
101	if (!vo)
102		vo = (ram->mr[6] & 0xff0) >> 4;
103	if (ram->mr[6] & 0x001)
104		pd = 1; /* binary driver does this.. bug? */
105	ram->mr[6] &= ~0xff1;
106	ram->mr[6] |= (vo & 0xff) << 4;
107	ram->mr[6] |= (pd & 0x01) << 0;
108
109	if (NOTE00(vr)) {
110		ram->mr[7] &= ~0x300;
111		ram->mr[7] |= (vr & 0x03) << 8;
112	}
113	ram->mr[7] &= ~0x088;
114	ram->mr[7] |= (vh & 0x01) << 7;
115	ram->mr[7] |= (lf & 0x01) << 3;
116
117	ram->mr[8] &= ~0x003;
118	ram->mr[8] |= (WR & 0x10) >> 3;
119	ram->mr[8] |= (CL & 0x10) >> 4;
120	return 0;
121}