board/imgtec/boston/lowlevel_init.S

   1 /*
   2  * Copyright (C) 2016 Imagination Technologies
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <config.h>
   8
   9 #include <asm/addrspace.h>
  10 #include <asm/asm.h>
  11 #include <asm/mipsregs.h>
  12 #include <asm/regdef.h>
  13
  14 #include "boston-regs.h"
  15
  16 .data
  17
  18 msg_ddr_cal:    .ascii "DDR Cal "
  19 msg_ddr_ok:     .ascii "DDR OK  "
  20
  21 .text
  22
  23 LEAF(lowlevel_init)
  24         move    s0, ra
  25
  26         PTR_LA  a0, msg_ddr_cal
  27         bal     lowlevel_display
  28
  29         PTR_LI  t0, BOSTON_PLAT_DDR3STAT
  30 1:      lw      t1, 0(t0)
  31         andi    t1, t1, BOSTON_PLAT_DDR3STAT_CALIB
  32         beqz    t1, 1b
  33
  34         PTR_LA  a0, msg_ddr_ok
  35         bal     lowlevel_display
  36
  37         move    v0, zero
  38         jr      s0
  39         END(lowlevel_init)
  40
  41 LEAF(lowlevel_display)
  42         .set    push
  43         .set    noat
  44         PTR_LI  AT, BOSTON_LCD_BASE
  45 #ifdef CONFIG_64BIT
  46         ld      k1, 0(a0)
  47         sd      k1, 0(AT)
  48 #else
  49         lw      k1, 0(a0)
  50         sw      k1, 0(AT)
  51         lw      k1, 4(a0)
  52         sw      k1, 4(AT)
  53 #endif
  54         .set    pop
  55 1:      jr      ra
  56         END(lowlevel_display)