arch/arm/plat-omap/include/mach/sdrc.h

   1 #ifndef ____ASM_ARCH_SDRC_H
   2 #define ____ASM_ARCH_SDRC_H
   3
   4 /*
   5  * OMAP2/3 SDRC/SMS register definitions
   6  *
   7  * Copyright (C) 2007 Texas Instruments, Inc.
   8  * Copyright (C) 2007 Nokia Corporation
   9  *
  10  * Written by Paul Walmsley
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <mach/io.h>
  18
  19 /* SDRC register offsets - read/write with sdrc_{read,write}_reg() */
  20
  21 #define SDRC_SYSCONFIG          0x010
  22 #define SDRC_DLLA_CTRL          0x060
  23 #define SDRC_DLLA_STATUS        0x064
  24 #define SDRC_DLLB_CTRL          0x068
  25 #define SDRC_DLLB_STATUS        0x06C
  26 #define SDRC_POWER              0x070
  27 #define SDRC_MR_0               0x084
  28 #define SDRC_ACTIM_CTRL_A_0     0x09c
  29 #define SDRC_ACTIM_CTRL_B_0     0x0a0
  30 #define SDRC_RFR_CTRL_0         0x0a4
  31
  32 /*
  33  * These values represent the number of memory clock cycles between
  34  * autorefresh initiation.  They assume 1 refresh per 64 ms (JEDEC), 8192
  35  * rows per device, and include a subtraction of a 50 cycle window in the
  36  * event that the autorefresh command is delayed due to other SDRC activity.
  37  * The '| 1' sets the ARE field to send one autorefresh when the autorefresh
  38  * counter reaches 0.
  39  *
  40  * These represent optimal values for common parts, it won't work for all.
  41  * As long as you scale down, most parameters are still work, they just
  42  * become sub-optimal. The RFR value goes in the opposite direction. If you
  43  * don't adjust it down as your clock period increases the refresh interval
  44  * will not be met. Setting all parameters for complete worst case may work,
  45  * but may cut memory performance by 2x. Due to errata the DLLs need to be
  46  * unlocked and their value needs run time calibration. A dynamic call is
  47  * need for that as no single right value exists acorss production samples.
  48  *
  49  * Only the FULL speed values are given. Current code is such that rate
  50  * changes must be made at DPLLoutx2. The actual value adjustment for low
  51  * frequency operation will be handled by omap_set_performance()
  52  *
  53  * By having the boot loader boot up in the fastest L4 speed available likely
  54  * will result in something which you can switch between.
  55  */
  56 #define SDRC_RFR_CTRL_165MHz    (0x00044c00 | 1)
  57 #define SDRC_RFR_CTRL_133MHz    (0x0003de00 | 1)
  58 #define SDRC_RFR_CTRL_100MHz    (0x0002da01 | 1)
  59 #define SDRC_RFR_CTRL_110MHz    (0x0002da01 | 1) /* Need to calc */
  60 #define SDRC_RFR_CTRL_BYPASS    (0x00005000 | 1) /* Need to calc */
  61
  62
  63 /*
  64  * SMS register access
  65  */
  66
  67
  68 #define OMAP242X_SMS_REGADDR(reg)       IO_ADDRESS(OMAP2420_SMS_BASE + reg)
  69 #define OMAP243X_SMS_REGADDR(reg)       IO_ADDRESS(OMAP243X_SMS_BASE + reg)
  70 #define OMAP343X_SMS_REGADDR(reg)       IO_ADDRESS(OMAP343X_SMS_BASE + reg)
  71
  72 /* SMS register offsets - read/write with sms_{read,write}_reg() */
  73
  74 #define SMS_SYSCONFIG           0x010
  75 /* REVISIT: fill in other SMS registers here */
  76
  77 #endif