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>

1 files changed, 175 insertions, 0 deletions

diff --git a/include/memory/jedec_ddr.h b/include/memory/jedec_ddr.h
new file mode 100644
index 000000000000..ddad0f870e5d
--- /dev/null
+++ b/include/memory/jedec_ddr.h
@@ -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 */