9c1c21a053
add LPDDR2 data from the JEDEC spec JESD209-2. The data includes: 1. Addressing information for LPDDR2 memories of different densities and types(S2/S4) 2. AC timing data. This data will useful for memory controller device drivers. Right now this is used by the TI EMIF SDRAM controller driver. Signed-off-by: Aneesh V <aneesh@ti.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Benoit Cousson <b-cousson@ti.com> [santosh.shilimkar@ti.com: Moved to drivers/memory from drivers/misc] Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/*
|
|
* DDR addressing details and AC timing parameters from JEDEC specs
|
|
*
|
|
* Copyright (C) 2012 Texas Instruments, Inc.
|
|
*
|
|
* Aneesh V <aneesh@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <memory/jedec_ddr.h>
|
|
#include <linux/module.h>
|
|
|
|
/* LPDDR2 addressing details from JESD209-2 section 2.4 */
|
|
const struct lpddr2_addressing
|
|
lpddr2_jedec_addressing_table[NUM_DDR_ADDR_TABLE_ENTRIES] = {
|
|
{B4, T_REFI_15_6, T_RFC_90}, /* 64M */
|
|
{B4, T_REFI_15_6, T_RFC_90}, /* 128M */
|
|
{B4, T_REFI_7_8, T_RFC_90}, /* 256M */
|
|
{B4, T_REFI_7_8, T_RFC_90}, /* 512M */
|
|
{B8, T_REFI_7_8, T_RFC_130}, /* 1GS4 */
|
|
{B8, T_REFI_3_9, T_RFC_130}, /* 2GS4 */
|
|
{B8, T_REFI_3_9, T_RFC_130}, /* 4G */
|
|
{B8, T_REFI_3_9, T_RFC_210}, /* 8G */
|
|
{B4, T_REFI_7_8, T_RFC_130}, /* 1GS2 */
|
|
{B4, T_REFI_3_9, T_RFC_130}, /* 2GS2 */
|
|
};
|
|
EXPORT_SYMBOL_GPL(lpddr2_jedec_addressing_table);
|
|
|
|
/* LPDDR2 AC timing parameters from JESD209-2 section 12 */
|
|
const struct lpddr2_timings
|
|
lpddr2_jedec_timings[NUM_DDR_TIMING_TABLE_ENTRIES] = {
|
|
/* Speed bin 400(200 MHz) */
|
|
[0] = {
|
|
.max_freq = 200000000,
|
|
.min_freq = 10000000,
|
|
.tRPab = 21000,
|
|
.tRCD = 18000,
|
|
.tWR = 15000,
|
|
.tRAS_min = 42000,
|
|
.tRRD = 10000,
|
|
.tWTR = 10000,
|
|
.tXP = 7500,
|
|
.tRTP = 7500,
|
|
.tCKESR = 15000,
|
|
.tDQSCK_max = 5500,
|
|
.tFAW = 50000,
|
|
.tZQCS = 90000,
|
|
.tZQCL = 360000,
|
|
.tZQinit = 1000000,
|
|
.tRAS_max_ns = 70000,
|
|
.tDQSCK_max_derated = 6000,
|
|
},
|
|
/* Speed bin 533(266 MHz) */
|
|
[1] = {
|
|
.max_freq = 266666666,
|
|
.min_freq = 10000000,
|
|
.tRPab = 21000,
|
|
.tRCD = 18000,
|
|
.tWR = 15000,
|
|
.tRAS_min = 42000,
|
|
.tRRD = 10000,
|
|
.tWTR = 7500,
|
|
.tXP = 7500,
|
|
.tRTP = 7500,
|
|
.tCKESR = 15000,
|
|
.tDQSCK_max = 5500,
|
|
.tFAW = 50000,
|
|
.tZQCS = 90000,
|
|
.tZQCL = 360000,
|
|
.tZQinit = 1000000,
|
|
.tRAS_max_ns = 70000,
|
|
.tDQSCK_max_derated = 6000,
|
|
},
|
|
/* Speed bin 800(400 MHz) */
|
|
[2] = {
|
|
.max_freq = 400000000,
|
|
.min_freq = 10000000,
|
|
.tRPab = 21000,
|
|
.tRCD = 18000,
|
|
.tWR = 15000,
|
|
.tRAS_min = 42000,
|
|
.tRRD = 10000,
|
|
.tWTR = 7500,
|
|
.tXP = 7500,
|
|
.tRTP = 7500,
|
|
.tCKESR = 15000,
|
|
.tDQSCK_max = 5500,
|
|
.tFAW = 50000,
|
|
.tZQCS = 90000,
|
|
.tZQCL = 360000,
|
|
.tZQinit = 1000000,
|
|
.tRAS_max_ns = 70000,
|
|
.tDQSCK_max_derated = 6000,
|
|
},
|
|
/* Speed bin 1066(533 MHz) */
|
|
[3] = {
|
|
.max_freq = 533333333,
|
|
.min_freq = 10000000,
|
|
.tRPab = 21000,
|
|
.tRCD = 18000,
|
|
.tWR = 15000,
|
|
.tRAS_min = 42000,
|
|
.tRRD = 10000,
|
|
.tWTR = 7500,
|
|
.tXP = 7500,
|
|
.tRTP = 7500,
|
|
.tCKESR = 15000,
|
|
.tDQSCK_max = 5500,
|
|
.tFAW = 50000,
|
|
.tZQCS = 90000,
|
|
.tZQCL = 360000,
|
|
.tZQinit = 1000000,
|
|
.tRAS_max_ns = 70000,
|
|
.tDQSCK_max_derated = 5620,
|
|
},
|
|
};
|
|
EXPORT_SYMBOL_GPL(lpddr2_jedec_timings);
|
|
|
|
const struct lpddr2_min_tck lpddr2_jedec_min_tck = {
|
|
.tRPab = 3,
|
|
.tRCD = 3,
|
|
.tWR = 3,
|
|
.tRASmin = 3,
|
|
.tRRD = 2,
|
|
.tWTR = 2,
|
|
.tXP = 2,
|
|
.tRTP = 2,
|
|
.tCKE = 3,
|
|
.tCKESR = 3,
|
|
.tFAW = 8
|
|
};
|
|
EXPORT_SYMBOL_GPL(lpddr2_jedec_min_tck);
|