arch/arm/mach-omap2/sdrc.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef __ARCH_ARM_MACH_OMAP2_SDRC_H
   3 #define __ARCH_ARM_MACH_OMAP2_SDRC_H
   4
   5 /*
   6  * OMAP2/3 SDRC/SMS macros and prototypes
   7  *
   8  * Copyright (C) 2007-2008, 2012 Texas Instruments, Inc.
   9  * Copyright (C) 2007-2008 Nokia Corporation
  10  *
  11  * Paul Walmsley
  12  * Tony Lindgren
  13  * Richard Woodruff
  14  */
  15 #undef DEBUG
  16
  17 #ifndef __ASSEMBLER__
  18
  19 #include <linux/io.h>
  20
  21 extern void __iomem *omap2_sdrc_base;
  22 extern void __iomem *omap2_sms_base;
  23
  24 #define OMAP_SDRC_REGADDR(reg)                  (omap2_sdrc_base + (reg))
  25 #define OMAP_SMS_REGADDR(reg)                   (omap2_sms_base + (reg))
  26
  27 /* SDRC global register get/set */
  28
  29 static inline void sdrc_write_reg(u32 val, u16 reg)
  30 {
  31         writel_relaxed(val, OMAP_SDRC_REGADDR(reg));
  32 }
  33
  34 static inline u32 sdrc_read_reg(u16 reg)
  35 {
  36         return readl_relaxed(OMAP_SDRC_REGADDR(reg));
  37 }
  38
  39 /* SMS global register get/set */
  40
  41 static inline void sms_write_reg(u32 val, u16 reg)
  42 {
  43         writel_relaxed(val, OMAP_SMS_REGADDR(reg));
  44 }
  45
  46 static inline u32 sms_read_reg(u16 reg)
  47 {
  48         return readl_relaxed(OMAP_SMS_REGADDR(reg));
  49 }
  50
  51 extern void omap2_set_globals_sdrc(void __iomem *sdrc, void __iomem *sms);
  52
  53
  54 /**
  55  * struct omap_sdrc_params - SDRC parameters for a given SDRC clock rate
  56  * @rate: SDRC clock rate (in Hz)
  57  * @actim_ctrla: Value to program to SDRC_ACTIM_CTRLA for this rate
  58  * @actim_ctrlb: Value to program to SDRC_ACTIM_CTRLB for this rate
  59  * @rfr_ctrl: Value to program to SDRC_RFR_CTRL for this rate
  60  * @mr: Value to program to SDRC_MR for this rate
  61  *
  62  * This structure holds a pre-computed set of register values for the
  63  * SDRC for a given SDRC clock rate and SDRAM chip.  These are
  64  * intended to be pre-computed and specified in an array in the board-*.c
  65  * files.  The structure is keyed off the 'rate' field.
  66  */
  67 struct omap_sdrc_params {
  68         unsigned long rate;
  69         u32 actim_ctrla;
  70         u32 actim_ctrlb;
  71         u32 rfr_ctrl;
  72         u32 mr;
  73 };
  74
  75 #ifdef CONFIG_SOC_HAS_OMAP2_SDRC
  76 void omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
  77                             struct omap_sdrc_params *sdrc_cs1);
  78 #else
  79 static inline void __init omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
  80                                           struct omap_sdrc_params *sdrc_cs1) {};
  81 #endif
  82
  83 int omap2_sdrc_get_params(unsigned long r,
  84                           struct omap_sdrc_params **sdrc_cs0,
  85                           struct omap_sdrc_params **sdrc_cs1);
  86 void omap2_sms_save_context(void);
  87 void omap2_sms_restore_context(void);
  88
  89 struct memory_timings {
  90         u32 m_type;             /* ddr = 1, sdr = 0 */
  91         u32 dll_mode;           /* use lock mode = 1, unlock mode = 0 */
  92         u32 slow_dll_ctrl;      /* unlock mode, dll value for slow speed */
  93         u32 fast_dll_ctrl;      /* unlock mode, dll value for fast speed */
  94         u32 base_cs;            /* base chip select to use for calculations */
  95 };
  96
  97 extern void omap2xxx_sdrc_init_params(u32 force_lock_to_unlock_mode);
  98 struct omap_sdrc_params *rx51_get_sdram_timings(void);
  99
 100 u32 omap2xxx_sdrc_dll_is_unlocked(void);
 101 u32 omap2xxx_sdrc_reprogram(u32 level, u32 force);
 102
 103
 104 #else
 105 #define OMAP242X_SDRC_REGADDR(reg)                                      \
 106                         OMAP2_L3_IO_ADDRESS(OMAP2420_SDRC_BASE + (reg))
 107 #define OMAP243X_SDRC_REGADDR(reg)                                      \
 108                         OMAP2_L3_IO_ADDRESS(OMAP243X_SDRC_BASE + (reg))
 109 #define OMAP34XX_SDRC_REGADDR(reg)                                      \
 110                         OMAP2_L3_IO_ADDRESS(OMAP343X_SDRC_BASE + (reg))
 111
 112 #endif  /* __ASSEMBLER__ */
 113
 114 /* Minimum frequency that the SDRC DLL can lock at */
 115 #define MIN_SDRC_DLL_LOCK_FREQ          83000000
 116
 117 /* Scale factor for fixed-point arith in omap3_core_dpll_m2_set_rate() */
 118 #define SDRC_MPURATE_SCALE              8
 119
 120 /* 2^SDRC_MPURATE_BASE_SHIFT: MPU MHz that SDRC_MPURATE_LOOPS is defined for */
 121 #define SDRC_MPURATE_BASE_SHIFT         9
 122
 123 /*
 124  * SDRC_MPURATE_LOOPS: Number of MPU loops to execute at
 125  * 2^MPURATE_BASE_SHIFT MHz for SDRC to stabilize
 126  */
 127 #define SDRC_MPURATE_LOOPS              96
 128
 129 /* SDRC register offsets - read/write with sdrc_{read,write}_reg() */
 130
 131 #define SDRC_SYSCONFIG          0x010
 132 #define SDRC_CS_CFG             0x040
 133 #define SDRC_SHARING            0x044
 134 #define SDRC_ERR_TYPE           0x04C
 135 #define SDRC_DLLA_CTRL          0x060
 136 #define SDRC_DLLA_STATUS        0x064
 137 #define SDRC_DLLB_CTRL          0x068
 138 #define SDRC_DLLB_STATUS        0x06C
 139 #define SDRC_POWER              0x070
 140 #define SDRC_MCFG_0             0x080
 141 #define SDRC_MR_0               0x084
 142 #define SDRC_EMR2_0             0x08c
 143 #define SDRC_ACTIM_CTRL_A_0     0x09c
 144 #define SDRC_ACTIM_CTRL_B_0     0x0a0
 145 #define SDRC_RFR_CTRL_0         0x0a4
 146 #define SDRC_MANUAL_0           0x0a8
 147 #define SDRC_MCFG_1             0x0B0
 148 #define SDRC_MR_1               0x0B4
 149 #define SDRC_EMR2_1             0x0BC
 150 #define SDRC_ACTIM_CTRL_A_1     0x0C4
 151 #define SDRC_ACTIM_CTRL_B_1     0x0C8
 152 #define SDRC_RFR_CTRL_1         0x0D4
 153 #define SDRC_MANUAL_1           0x0D8
 154
 155 #define SDRC_POWER_AUTOCOUNT_SHIFT      8
 156 #define SDRC_POWER_AUTOCOUNT_MASK       (0xffff << SDRC_POWER_AUTOCOUNT_SHIFT)
 157 #define SDRC_POWER_CLKCTRL_SHIFT        4
 158 #define SDRC_POWER_CLKCTRL_MASK         (0x3 << SDRC_POWER_CLKCTRL_SHIFT)
 159 #define SDRC_SELF_REFRESH_ON_AUTOCOUNT  (0x2 << SDRC_POWER_CLKCTRL_SHIFT)
 160
 161 /*
 162  * These values represent the number of memory clock cycles between
 163  * autorefresh initiation.  They assume 1 refresh per 64 ms (JEDEC), 8192
 164  * rows per device, and include a subtraction of a 50 cycle window in the
 165  * event that the autorefresh command is delayed due to other SDRC activity.
 166  * The '| 1' sets the ARE field to send one autorefresh when the autorefresh
 167  * counter reaches 0.
 168  *
 169  * These represent optimal values for common parts, it won't work for all.
 170  * As long as you scale down, most parameters are still work, they just
 171  * become sub-optimal. The RFR value goes in the opposite direction. If you
 172  * don't adjust it down as your clock period increases the refresh interval
 173  * will not be met. Setting all parameters for complete worst case may work,
 174  * but may cut memory performance by 2x. Due to errata the DLLs need to be
 175  * unlocked and their value needs run time calibration. A dynamic call is
 176  * need for that as no single right value exists across production samples.
 177  *
 178  * Only the FULL speed values are given. Current code is such that rate
 179  * changes must be made at DPLLoutx2. The actual value adjustment for low
 180  * frequency operation will be handled by omap_set_performance()
 181  *
 182  * By having the boot loader boot up in the fastest L4 speed available likely
 183  * will result in something which you can switch between.
 184  */
 185 #define SDRC_RFR_CTRL_165MHz    (0x00044c00 | 1)
 186 #define SDRC_RFR_CTRL_133MHz    (0x0003de00 | 1)
 187 #define SDRC_RFR_CTRL_100MHz    (0x0002da01 | 1)
 188 #define SDRC_RFR_CTRL_110MHz    (0x0002da01 | 1) /* Need to calc */
 189 #define SDRC_RFR_CTRL_BYPASS    (0x00005000 | 1) /* Need to calc */
 190
 191
 192 /*
 193  * SMS register access
 194  */
 195
 196 #define OMAP242X_SMS_REGADDR(reg)                                       \
 197                 (void __iomem *)OMAP2_L3_IO_ADDRESS(OMAP2420_SMS_BASE + reg)
 198 #define OMAP243X_SMS_REGADDR(reg)                                       \
 199                 (void __iomem *)OMAP2_L3_IO_ADDRESS(OMAP243X_SMS_BASE + reg)
 200 #define OMAP343X_SMS_REGADDR(reg)                                       \
 201                 (void __iomem *)OMAP2_L3_IO_ADDRESS(OMAP343X_SMS_BASE + reg)
 202
 203 /* SMS register offsets - read/write with sms_{read,write}_reg() */
 204
 205 #define SMS_SYSCONFIG                   0x010
 206 /* REVISIT: fill in other SMS registers here */
 207
 208
 209
 210 #endif