arch/arm/include/asm/arch-tegra20/emc.h

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef _ARCH_EMC_H_
   9 #define _ARCH_EMC_H_
  10
  11 #include <asm/types.h>
  12
  13 #define TEGRA_EMC_NUM_REGS      46
  14
  15 /* EMC Registers */
  16 struct emc_ctlr {
  17         u32 cfg;                /* 0x00: EMC_CFG */
  18         u32 reserved0[3];       /* 0x04 ~ 0x0C */
  19         u32 adr_cfg;            /* 0x10: EMC_ADR_CFG */
  20         u32 adr_cfg1;           /* 0x14: EMC_ADR_CFG_1 */
  21         u32 reserved1[2];       /* 0x18 ~ 0x18 */
  22         u32 refresh_ctrl;       /* 0x20: EMC_REFCTRL */
  23         u32 pin;                /* 0x24: EMC_PIN */
  24         u32 timing_ctrl;        /* 0x28: EMC_TIMING_CONTROL */
  25         u32 rc;                 /* 0x2C: EMC_RC */
  26         u32 rfc;                /* 0x30: EMC_RFC */
  27         u32 ras;                /* 0x34: EMC_RAS */
  28         u32 rp;                 /* 0x38: EMC_RP */
  29         u32 r2w;                /* 0x3C: EMC_R2W */
  30         u32 w2r;                /* 0x40: EMC_W2R */
  31         u32 r2p;                /* 0x44: EMC_R2P */
  32         u32 w2p;                /* 0x48: EMC_W2P */
  33         u32 rd_rcd;             /* 0x4C: EMC_RD_RCD */
  34         u32 wd_rcd;             /* 0x50: EMC_WD_RCD */
  35         u32 rrd;                /* 0x54: EMC_RRD */
  36         u32 rext;               /* 0x58: EMC_REXT */
  37         u32 wdv;                /* 0x5C: EMC_WDV */
  38         u32 quse;               /* 0x60: EMC_QUSE */
  39         u32 qrst;               /* 0x64: EMC_QRST */
  40         u32 qsafe;              /* 0x68: EMC_QSAFE */
  41         u32 rdv;                /* 0x6C: EMC_RDV */
  42         u32 refresh;            /* 0x70: EMC_REFRESH */
  43         u32 burst_refresh_num;  /* 0x74: EMC_BURST_REFRESH_NUM */
  44         u32 pdex2wr;            /* 0x78: EMC_PDEX2WR */
  45         u32 pdex2rd;            /* 0x7c: EMC_PDEX2RD */
  46         u32 pchg2pden;          /* 0x80: EMC_PCHG2PDEN */
  47         u32 act2pden;           /* 0x84: EMC_ACT2PDEN */
  48         u32 ar2pden;            /* 0x88: EMC_AR2PDEN */
  49         u32 rw2pden;            /* 0x8C: EMC_RW2PDEN */
  50         u32 txsr;               /* 0x90: EMC_TXSR */
  51         u32 tcke;               /* 0x94: EMC_TCKE */
  52         u32 tfaw;               /* 0x98: EMC_TFAW */
  53         u32 trpab;              /* 0x9C: EMC_TRPAB */
  54         u32 tclkstable;         /* 0xA0: EMC_TCLKSTABLE */
  55         u32 tclkstop;           /* 0xA4: EMC_TCLKSTOP */
  56         u32 trefbw;             /* 0xA8: EMC_TREFBW */
  57         u32 quse_extra;         /* 0xAC: EMC_QUSE_EXTRA */
  58         u32 odt_write;          /* 0xB0: EMC_ODT_WRITE */
  59         u32 odt_read;           /* 0xB4: EMC_ODT_READ */
  60         u32 reserved2[5];       /* 0xB8 ~ 0xC8 */
  61         u32 mrs;                /* 0xCC: EMC_MRS */
  62         u32 emrs;               /* 0xD0: EMC_EMRS */
  63         u32 ref;                /* 0xD4: EMC_REF */
  64         u32 pre;                /* 0xD8: EMC_PRE */
  65         u32 nop;                /* 0xDC: EMC_NOP */
  66         u32 self_ref;           /* 0xE0: EMC_SELF_REF */
  67         u32 dpd;                /* 0xE4: EMC_DPD */
  68         u32 mrw;                /* 0xE8: EMC_MRW */
  69         u32 mrr;                /* 0xEC: EMC_MRR */
  70         u32 reserved3;          /* 0xF0: */
  71         u32 fbio_cfg1;          /* 0xF4: EMC_FBIO_CFG1 */
  72         u32 fbio_dqsib_dly;     /* 0xF8: EMC_FBIO_DQSIB_DLY */
  73         u32 fbio_dqsib_dly_msb; /* 0xFC: EMC_FBIO_DQSIB_DLY_MSG */
  74         u32 fbio_spare;         /* 0x100: SBIO_SPARE */
  75                                 /* There are more registers ... */
  76 };
  77
  78 /**
  79  * Set up the EMC for the given rate. The timing parameters are retrieved
  80  * from the device tree "nvidia,tegra20-emc" node and its
  81  * "nvidia,tegra20-emc-table" sub-nodes.
  82  *
  83  * @param blob  Device tree blob
  84  * @param rate  Clock speed of memory controller in Hz (=2x memory bus rate)
  85  * @return 0 if ok, else -ve error code (look in emc.c to decode it)
  86  */
  87 int tegra_set_emc(const void *blob, unsigned rate);
  88
  89 /**
  90  * Get a pointer to the EMC controller from the device tree.
  91  *
  92  * @param blob  Device tree blob
  93  * @return pointer to EMC controller
  94  */
  95 struct emc_ctlr *emc_get_controller(const void *blob);
  96
  97 #endif