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/*
* This file is part of the coreboot project.
*
* Copyright 2017 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <baseboard/variants.h>
#include <string.h>
/* Rcomp resistor */
static const u16 rcomp_resistor_ddp[] = { 121, 81, 100 };
static const u16 rcomp_resistor_sdp[] = { 200, 81, 100 };
/* Rcomp target */
static const u16 rcomp_target[] = { 100, 40, 20, 20, 26 };
/* Memory ids are 1-indexed, so subtract 1 to use 0-indexed values in bitmap. */
#define MEM_ID(x) (1 << ((x) - 1))
/* Bitmap to indicate which memory ids are using DDP. */
static const uint16_t ddp_bitmap = MEM_ID(4);
void variant_memory_params(struct memory_params *p)
{
memset(p, 0, sizeof(*p));
p->type = MEMORY_DDR4;
/* Rcomp resistor values are different for SDP and DDP. */
if (ddp_bitmap & MEM_ID(variant_memory_sku())) {
p->rcomp_resistor = rcomp_resistor_ddp;
p->rcomp_resistor_size = sizeof(rcomp_resistor_ddp);
} else {
p->rcomp_resistor = rcomp_resistor_sdp;
p->rcomp_resistor_size = sizeof(rcomp_resistor_sdp);
}
p->rcomp_target = rcomp_target;
p->rcomp_target_size = sizeof(rcomp_target);
}
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