arch/arm/mach-omap2/sdrc.h

   1 #ifndef __ARCH_ARM_MACH_OMAP2_SDRC_H
   2 #define __ARCH_ARM_MACH_OMAP2_SDRC_H
   3
   4 /*
   5  * OMAP2/3 SDRC/SMS macros and prototypes
   6  *
   7  * Copyright (C) 2007-2008, 2012 Texas Instruments, Inc.
   8  * Copyright (C) 2007-2008 Nokia Corporation
   9  *
  10  * Paul Walmsley
  11  * Tony Lindgren
  12  * Richard Woodruff
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18 #undef DEBUG
  19
  20 #ifndef __ASSEMBLER__
  21
  22 #include <linux/io.h>
  23
  24 extern void __iomem *omap2_sdrc_base;
  25 extern void __iomem *omap2_sms_base;
  26
  27 #define OMAP_SDRC_REGADDR(reg)                  (omap2_sdrc_base + (reg))
  28 #define OMAP_SMS_REGADDR(reg)                   (omap2_sms_base + (reg))
  29
  30 /* SDRC global register get/set */
  31
  32 static inline void sdrc_write_reg(u32 val, u16 reg)
  33 {
  34         writel_relaxed(val, OMAP_SDRC_REGADDR(reg));
  35 }
  36
  37 static inline u32 sdrc_read_reg(u16 reg)
  38 {
  39         return readl_relaxed(OMAP_SDRC_REGADDR(reg));
  40 }
  41
  42 /* SMS global register get/set */
  43
  44 static inline void sms_write_reg(u32 val, u16 reg)
  45 {
  46         writel_relaxed(val, OMAP_SMS_REGADDR(reg));
  47 }
  48
  49 static inline u32 sms_read_reg(u16 reg)
  50 {
  51         return readl_relaxed(OMAP_SMS_REGADDR(reg));
  52 }
  53
  54 extern void omap2_set_globals_sdrc(void __iomem *sdrc, void __iomem *sms);
  55
  56
  57 /**
  58  * struct omap_sdrc_params - SDRC parameters for a given SDRC clock rate
  59  * @rate: SDRC clock rate (in Hz)
  60  * @actim_ctrla: Value to program to SDRC_ACTIM_CTRLA for this rate
  61  * @actim_ctrlb: Value to program to SDRC_ACTIM_CTRLB for this rate
  62  * @rfr_ctrl: Value to program to SDRC_RFR_CTRL for this rate
  63  * @mr: Value to program to SDRC_MR for this rate
  64  *
  65  * This structure holds a pre-computed set of register values for the
  66  * SDRC for a given SDRC clock rate and SDRAM chip.  These are
  67  * intended to be pre-computed and specified in an array in the board-*.c
  68  * files.  The structure is keyed off the 'rate' field.
  69  */
  70 struct omap_sdrc_params {
  71         unsigned long rate;
  72         u32 actim_ctrla;
  73         u32 actim_ctrlb;
  74         u32 rfr_ctrl;
  75         u32 mr;
  76 };
  77
  78 #ifdef CONFIG_SOC_HAS_OMAP2_SDRC
  79 void omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
  80                             struct omap_sdrc_params *sdrc_cs1);
  81 #else
  82 static inline void __init omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
  83                                           struct omap_sdrc_params *sdrc_cs1) {};
  84 #endif
  85
  86 int omap2_sdrc_get_params(unsigned long r,
  87                           struct omap_sdrc_params **sdrc_cs0,
  88                           struct omap_sdrc_params **sdrc_cs1);
  89 void omap2_sms_save_context(void);
  90 void omap2_sms_restore_context(void);
  91
  92 struct memory_timings {
  93         u32 m_type;             /* ddr = 1, sdr = 0 */
  94         u32 dll_mode;           /* use lock mode = 1, unlock mode = 0 */
  95         u32 slow_dll_ctrl;      /* unlock mode, dll value for slow speed */
  96         u32 fast_dll_ctrl;      /* unlock mode, dll value for fast speed */
  97         u32 base_cs;            /* base chip select to use for calculations */
  98 };
  99
 100 extern void omap2xxx_sdrc_init_params(u32 force_lock_to_unlock_mode);
 101 struct omap_sdrc_params *rx51_get_sdram_timings(void);
 102
 103 u32 omap2xxx_sdrc_dll_is_unlocked(void);
 104 u32 omap2xxx_sdrc_reprogram(u32 level, u32 force);
 105
 106
 107 #else
 108 #define OMAP242X_SDRC_REGADDR(reg)                                      \
 109                         OMAP2_L3_IO_ADDRESS(OMAP2420_SDRC_BASE + (reg))
 110 #define OMAP243X_SDRC_REGADDR(reg)                                      \
 111                         OMAP2_L3_IO_ADDRESS(OMAP243X_SDRC_BASE + (reg))
 112 #define OMAP34XX_SDRC_REGADDR(reg)                                      \
 113                         OMAP2_L3_IO_ADDRESS(OMAP343X_SDRC_BASE + (reg))
 114
 115 #endif  /* __ASSEMBLER__ */
 116
 117 /* Minimum frequency that the SDRC DLL can lock at */
 118 #define MIN_SDRC_DLL_LOCK_FREQ          83000000
 119
 120 /* Scale factor for fixed-point arith in omap3_core_dpll_m2_set_rate() */
 121 #define SDRC_MPURATE_SCALE              8
 122
 123 /* 2^SDRC_MPURATE_BASE_SHIFT: MPU MHz that SDRC_MPURATE_LOOPS is defined for */
 124 #define SDRC_MPURATE_BASE_SHIFT         9
 125
 126 /*
 127  * SDRC_MPURATE_LOOPS: Number of MPU loops to execute at
 128  * 2^MPURATE_BASE_SHIFT MHz for SDRC to stabilize
 129  */
 130 #define SDRC_MPURATE_LOOPS              96
 131
 132 /* SDRC register offsets - read/write with sdrc_{read,write}_reg() */
 133
 134 #define SDRC_SYSCONFIG          0x010
 135 #define SDRC_CS_CFG             0x040
 136 #define SDRC_SHARING            0x044
 137 #define SDRC_ERR_TYPE           0x04C
 138 #define SDRC_DLLA_CTRL          0x060
 139 #define SDRC_DLLA_STATUS        0x064
 140 #define SDRC_DLLB_CTRL          0x068
 141 #define SDRC_DLLB_STATUS        0x06C
 142 #define SDRC_POWER              0x070
 143 #define SDRC_MCFG_0             0x080
 144 #define SDRC_MR_0               0x084
 145 #define SDRC_EMR2_0             0x08c
 146 #define SDRC_ACTIM_CTRL_A_0     0x09c
 147 #define SDRC_ACTIM_CTRL_B_0     0x0a0
 148 #define SDRC_RFR_CTRL_0         0x0a4
 149 #define SDRC_MANUAL_0           0x0a8
 150 #define SDRC_MCFG_1             0x0B0
 151 #define SDRC_MR_1               0x0B4
 152 #define SDRC_EMR2_1             0x0BC
 153 #define SDRC_ACTIM_CTRL_A_1     0x0C4
 154 #define SDRC_ACTIM_CTRL_B_1     0x0C8
 155 #define SDRC_RFR_CTRL_1         0x0D4
 156 #define SDRC_MANUAL_1           0x0D8
 157
 158 #define SDRC_POWER_AUTOCOUNT_SHIFT      8
 159 #define SDRC_POWER_AUTOCOUNT_MASK       (0xffff << SDRC_POWER_AUTOCOUNT_SHIFT)
 160 #define SDRC_POWER_CLKCTRL_SHIFT        4
 161 #define SDRC_POWER_CLKCTRL_MASK         (0x3 << SDRC_POWER_CLKCTRL_SHIFT)
 162 #define SDRC_SELF_REFRESH_ON_AUTOCOUNT  (0x2 << SDRC_POWER_CLKCTRL_SHIFT)
 163
 164 /*
 165  * These values represent the number of memory clock cycles between
 166  * autorefresh initiation.  They assume 1 refresh per 64 ms (JEDEC), 8192
 167  * rows per device, and include a subtraction of a 50 cycle window in the
 168  * event that the autorefresh command is delayed due to other SDRC activity.
 169  * The '| 1' sets the ARE field to send one autorefresh when the autorefresh
 170  * counter reaches 0.
 171  *
 172  * These represent optimal values for common parts, it won't work for all.
 173  * As long as you scale down, most parameters are still work, they just
 174  * become sub-optimal. The RFR value goes in the opposite direction. If you
 175  * don't adjust it down as your clock period increases the refresh interval
 176  * will not be met. Setting all parameters for complete worst case may work,
 177  * but may cut memory performance by 2x. Due to errata the DLLs need to be
 178  * unlocked and their value needs run time calibration. A dynamic call is
 179  * need for that as no single right value exists across production samples.
 180  *
 181  * Only the FULL speed values are given. Current code is such that rate
 182  * changes must be made at DPLLoutx2. The actual value adjustment for low
 183  * frequency operation will be handled by omap_set_performance()
 184  *
 185  * By having the boot loader boot up in the fastest L4 speed available likely
 186  * will result in something which you can switch between.
 187  */
 188 #define SDRC_RFR_CTRL_165MHz    (0x00044c00 | 1)
 189 #define SDRC_RFR_CTRL_133MHz    (0x0003de00 | 1)
 190 #define SDRC_RFR_CTRL_100MHz    (0x0002da01 | 1)
 191 #define SDRC_RFR_CTRL_110MHz    (0x0002da01 | 1) /* Need to calc */
 192 #define SDRC_RFR_CTRL_BYPASS    (0x00005000 | 1) /* Need to calc */
 193
 194
 195 /*
 196  * SMS register access
 197  */
 198
 199 #define OMAP242X_SMS_REGADDR(reg)                                       \
 200                 (void __iomem *)OMAP2_L3_IO_ADDRESS(OMAP2420_SMS_BASE + reg)
 201 #define OMAP243X_SMS_REGADDR(reg)                                       \
 202                 (void __iomem *)OMAP2_L3_IO_ADDRESS(OMAP243X_SMS_BASE + reg)
 203 #define OMAP343X_SMS_REGADDR(reg)                                       \
 204                 (void __iomem *)OMAP2_L3_IO_ADDRESS(OMAP343X_SMS_BASE + reg)
 205
 206 /* SMS register offsets - read/write with sms_{read,write}_reg() */
 207
 208 #define SMS_SYSCONFIG                   0x010
 209 /* REVISIT: fill in other SMS registers here */
 210
 211
 212
 213 #endif