LXR uboot/arch/arm/mach-sunxi/dram_timings/ddr2

   1#include <common.h>
   2#include <asm/arch/dram.h>
   3#include <asm/arch/cpu.h>
   4
   5void mctl_set_timing_params(uint16_t socid, struct dram_para *para)
   6{
   7        struct sunxi_mctl_ctl_reg * const mctl_ctl =
   8                        (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
   9
  10        u8 tccd         = 1;
  11        u8 tfaw         = ns_to_t(50);
  12        u8 trrd         = max(ns_to_t(10), 2);
  13        u8 trcd         = ns_to_t(20);
  14        u8 trc          = ns_to_t(65);
  15        u8 txp          = 2;
  16        u8 twtr         = max(ns_to_t(8), 2);
  17        u8 trtp         = max(ns_to_t(8), 2);
  18        u8 twr          = max(ns_to_t(15), 3);
  19        u8 trp          = ns_to_t(15);
  20        u8 tras         = ns_to_t(45);
  21        u16 trefi       = ns_to_t(7800) / 32;
  22        u16 trfc        = ns_to_t(328);
  23
  24        u8 tmrw         = 0;
  25        u8 tmrd         = 2;
  26        u8 tmod         = 12;
  27        u8 tcke         = 3;
  28        u8 tcksrx       = 5;
  29        u8 tcksre       = 5;
  30        u8 tckesr       = 4;
  31        u8 trasmax      = 27;
  32
  33        u8 tcl          = 3; /* CL 6 */
  34        u8 tcwl         = 3; /* CWL 6 */
  35        u8 t_rdata_en   = 1;
  36        u8 wr_latency   = 1;
  37
  38        u32 tdinit0     = (400 * CONFIG_DRAM_CLK) + 1;          /* 400us */
  39        u32 tdinit1     = (500 * CONFIG_DRAM_CLK) / 1000 + 1;   /* 500ns */
  40        u32 tdinit2     = (200 * CONFIG_DRAM_CLK) + 1;          /* 200us */
  41        u32 tdinit3     = (1 * CONFIG_DRAM_CLK) + 1;            /* 1us */
  42
  43        u8 twtp         = tcwl + 2 + twr;       /* WL + BL / 2 + tWR */
  44        u8 twr2rd       = tcwl + 2 + twtr;      /* WL + BL / 2 + tWTR */
  45        u8 trd2wr       = tcl + 2 + 1 - tcwl;   /* RL + BL / 2 + 2 - WL */
  46
  47        /* set mode register */
  48        writel(0x263, &mctl_ctl->mr[0]);
  49        writel(0x4, &mctl_ctl->mr[1]);
  50        writel(0x0, &mctl_ctl->mr[2]);
  51        writel(0x0, &mctl_ctl->mr[3]);
  52
  53        /* set DRAM timing */
  54        writel(DRAMTMG0_TWTP(twtp) | DRAMTMG0_TFAW(tfaw) |
  55               DRAMTMG0_TRAS_MAX(trasmax) | DRAMTMG0_TRAS(tras),
  56               &mctl_ctl->dramtmg[0]);
  57        writel(DRAMTMG1_TXP(txp) | DRAMTMG1_TRTP(trtp) | DRAMTMG1_TRC(trc),
  58               &mctl_ctl->dramtmg[1]);
  59        writel(DRAMTMG2_TCWL(tcwl) | DRAMTMG2_TCL(tcl) |
  60               DRAMTMG2_TRD2WR(trd2wr) | DRAMTMG2_TWR2RD(twr2rd),
  61               &mctl_ctl->dramtmg[2]);
  62        writel(DRAMTMG3_TMRW(tmrw) | DRAMTMG3_TMRD(tmrd) | DRAMTMG3_TMOD(tmod),
  63               &mctl_ctl->dramtmg[3]);
  64        writel(DRAMTMG4_TRCD(trcd) | DRAMTMG4_TCCD(tccd) | DRAMTMG4_TRRD(trrd) |
  65               DRAMTMG4_TRP(trp), &mctl_ctl->dramtmg[4]);
  66        writel(DRAMTMG5_TCKSRX(tcksrx) | DRAMTMG5_TCKSRE(tcksre) |
  67               DRAMTMG5_TCKESR(tckesr) | DRAMTMG5_TCKE(tcke),
  68               &mctl_ctl->dramtmg[5]);
  69
  70        /* set two rank timing */
  71        clrsetbits_le32(&mctl_ctl->dramtmg[8], (0xff << 8) | (0xff << 0),
  72                        (0x66 << 8) | (0x10 << 0));
  73
  74        /* set PHY interface timing, write latency and read latency configure */
  75        writel((0x2 << 24) | (t_rdata_en << 16) | (0x1 << 8) |
  76               (wr_latency << 0), &mctl_ctl->pitmg[0]);
  77
  78        /* set PHY timing, PTR0-2 use default */
  79        writel(PTR3_TDINIT0(tdinit0) | PTR3_TDINIT1(tdinit1), &mctl_ctl->ptr[3]);
  80        writel(PTR4_TDINIT2(tdinit2) | PTR4_TDINIT3(tdinit3), &mctl_ctl->ptr[4]);
  81
  82        /* set refresh timing */
  83        writel(RFSHTMG_TREFI(trefi) | RFSHTMG_TRFC(trfc), &mctl_ctl->rfshtmg);
  84}
  85