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ddr: add LPDDR2 data from JESD209-2 

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>
This commit is contained in:
Aneesh V 2012-04-27 17:54:03 +05:30 committed by Greg Kroah-Hartman
parent 516cf1be07
commit 9c1c21a053
4 changed files with 320 additions and 0 deletions
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175
include/memory/jedec_ddr.h Normal file
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@ -0,0 +1,175 @@
/*
* Definitions for DDR memories based on 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.
*/
#ifndef __LINUX_JEDEC_DDR_H
#define __LINUX_JEDEC_DDR_H
#include <linux/types.h>
/* DDR Densities */
#define DDR_DENSITY_64Mb 1
#define DDR_DENSITY_128Mb 2
#define DDR_DENSITY_256Mb 3
#define DDR_DENSITY_512Mb 4
#define DDR_DENSITY_1Gb 5
#define DDR_DENSITY_2Gb 6
#define DDR_DENSITY_4Gb 7
#define DDR_DENSITY_8Gb 8
#define DDR_DENSITY_16Gb 9
#define DDR_DENSITY_32Gb 10
/* DDR type */
#define DDR_TYPE_DDR2 1
#define DDR_TYPE_DDR3 2
#define DDR_TYPE_LPDDR2_S4 3
#define DDR_TYPE_LPDDR2_S2 4
#define DDR_TYPE_LPDDR2_NVM 5
/* DDR IO width */
#define DDR_IO_WIDTH_4 1
#define DDR_IO_WIDTH_8 2
#define DDR_IO_WIDTH_16 3
#define DDR_IO_WIDTH_32 4
/* Number of Row bits */
#define R9 9
#define R10 10
#define R11 11
#define R12 12
#define R13 13
#define R14 14
#define R15 15
#define R16 16
/* Number of Column bits */
#define C7 7
#define C8 8
#define C9 9
#define C10 10
#define C11 11
#define C12 12
/* Number of Banks */
#define B1 0
#define B2 1
#define B4 2
#define B8 3
/* Refresh rate in nano-seconds */
#define T_REFI_15_6 15600
#define T_REFI_7_8 7800
#define T_REFI_3_9 3900
/* tRFC values */
#define T_RFC_90 90000
#define T_RFC_110 110000
#define T_RFC_130 130000
#define T_RFC_160 160000
#define T_RFC_210 210000
#define T_RFC_300 300000
#define T_RFC_350 350000
/* Mode register numbers */
#define DDR_MR0 0
#define DDR_MR1 1
#define DDR_MR2 2
#define DDR_MR3 3
#define DDR_MR4 4
#define DDR_MR5 5
#define DDR_MR6 6
#define DDR_MR7 7
#define DDR_MR8 8
#define DDR_MR9 9
#define DDR_MR10 10
#define DDR_MR11 11
#define DDR_MR16 16
#define DDR_MR17 17
#define DDR_MR18 18
/*
* LPDDR2 related defines
*/
/* MR4 register fields */
#define MR4_SDRAM_REF_RATE_SHIFT 0
#define MR4_SDRAM_REF_RATE_MASK 7
#define MR4_TUF_SHIFT 7
#define MR4_TUF_MASK (1 << 7)
/* MR4 SDRAM Refresh Rate field values */
#define SDRAM_TEMP_NOMINAL 0x3
#define SDRAM_TEMP_RESERVED_4 0x4
#define SDRAM_TEMP_HIGH_DERATE_REFRESH 0x5
#define SDRAM_TEMP_HIGH_DERATE_REFRESH_AND_TIMINGS 0x6
#define SDRAM_TEMP_VERY_HIGH_SHUTDOWN 0x7
#define NUM_DDR_ADDR_TABLE_ENTRIES 11
#define NUM_DDR_TIMING_TABLE_ENTRIES 4
/* Structure for DDR addressing info from the JEDEC spec */
struct lpddr2_addressing {
u32 num_banks;
u32 tREFI_ns;
u32 tRFCab_ps;
};
/*
* Structure for timings from the LPDDR2 datasheet
* All parameters are in pico seconds(ps) unless explicitly indicated
* with a suffix like tRAS_max_ns below
*/
struct lpddr2_timings {
u32 max_freq;
u32 min_freq;
u32 tRPab;
u32 tRCD;
u32 tWR;
u32 tRAS_min;
u32 tRRD;
u32 tWTR;
u32 tXP;
u32 tRTP;
u32 tCKESR;
u32 tDQSCK_max;
u32 tDQSCK_max_derated;
u32 tFAW;
u32 tZQCS;
u32 tZQCL;
u32 tZQinit;
u32 tRAS_max_ns;
};
/*
* Min value for some parameters in terms of number of tCK cycles(nCK)
* Please set to zero parameters that are not valid for a given memory
* type
*/
struct lpddr2_min_tck {
u32 tRPab;
u32 tRCD;
u32 tWR;
u32 tRASmin;
u32 tRRD;
u32 tWTR;
u32 tXP;
u32 tRTP;
u32 tCKE;
u32 tCKESR;
u32 tFAW;
};
extern const struct lpddr2_addressing
lpddr2_jedec_addressing_table[NUM_DDR_ADDR_TABLE_ENTRIES];
extern const struct lpddr2_timings
lpddr2_jedec_timings[NUM_DDR_TIMING_TABLE_ENTRIES];
extern const struct lpddr2_min_tck lpddr2_jedec_min_tck;
#endif /* __LINUX_JEDEC_DDR_H */

8
lib/Kconfig
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@ -353,6 +353,14 @@ config CORDIC
This option provides an implementation of the CORDIC algorithm;
calculations are in fixed point. Module will be called cordic.
config DDR
bool "JEDEC DDR data"
help
Data from JEDEC specs for DDR SDRAM memories,
particularly the AC timing parameters and addressing
information. This data is useful for drivers handling
DDR SDRAM controllers.
config MPILIB
tristate
select CLZ_TAB

2
lib/Makefile
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@ -123,6 +123,8 @@ obj-$(CONFIG_SIGNATURE) += digsig.o
obj-$(CONFIG_CLZ_TAB) += clz_tab.o
obj-$(CONFIG_DDR) += jedec_ddr_data.o
hostprogs-y := gen_crc32table
clean-files := crc32table.h

135
lib/jedec_ddr_data.c Normal file
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@ -0,0 +1,135 @@
/*
* 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);