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/*
* This file is part of the coreboot project.
*
* Copyright 2016 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.
*/
#ifndef _SOC_APOLLOLAKE_MEMINIT_H_
#define _SOC_APOLLOLAKE_MEMINIT_H_
#include <stdint.h>
/*
* LPDDR4 helper routines for configuring the memory UPD for LPDDR4 operation.
* There are 4 physical LPDDR4 channels each 32-bits wide. There are 2 logical
* channels using 2 physical channels together to form a 64-bit interface to
* memory for each logical channel.
*/
enum {
LP4_PHYS_CH0A,
LP4_PHYS_CH0B,
LP4_PHYS_CH1A,
LP4_PHYS_CH1B,
LP4_NUM_PHYS_CHANNELS,
};
/* Logical channel identification. */
enum {
LP4_LCH0,
LP4_LCH1,
};
/*
* The DQs within a physical channel can be bit-swizzled within each byte.
* Within a channel the bytes can be swapped, but the DQs need to be routed
* with the corresponding DQS (strobe).
*/
enum {
LP4_DQS0,
LP4_DQS1,
LP4_DQS2,
LP4_DQS3,
LP4_NUM_BYTE_LANES,
DQ_BITS_PER_DQS = 8,
};
enum {
/* RL-tRCD-tRP */
LP4_SPEED_1600 = 1600, /* 14-15-15 */
LP4_SPEED_2133 = 2133, /* 20-20-20 */
LP4_SPEED_2400 = 2400, /* 24-22-22 */
};
/* LPDDR4 module density in bits. */
enum {
LP4_8Gb_DENSITY = 2,
LP4_12Gb_DESNITY,
LP4_16Gb_DENSITY,
};
/* Provide bit swizzling per DQS and byte swapping within a channel. */
struct lpddr4_chan_swizzle_cfg {
uint8_t dqs[LP4_NUM_BYTE_LANES][DQ_BITS_PER_DQS];
};
struct lpddr4_swizzle_cfg {
struct lpddr4_chan_swizzle_cfg phys[LP4_NUM_PHYS_CHANNELS];
};
struct FSP_M_CONFIG;
/*
* Initialize default LPDDR4 settings with provided speed. No logical channels
* are enabled. Subsequent calls to logical channel enabling are required.
*/
void meminit_lpddr4(struct FSP_M_CONFIG *cfg, int speed);
/*
* Enable logical channel providing the full lpddr4_swizzle_config to
* fill in per channel swizzle definitions. This assumes a 64-bit wide
* memory width per logical channel -- i.e. 2 physical channels are configured
* to the memory reference code.
*/
void meminit_lpddr4_enable_channel(struct FSP_M_CONFIG *cfg, int logical_chan,
int device_density,
const struct lpddr4_swizzle_cfg *scfg);
#endif /* _SOC_APOLLOLAKE_MEMINIT_H_ */
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