arch/mips/mach-mscc/dram.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
   2 /*
   3  * Copyright (c) 2018 Microsemi Corporation
   4  */
   5
   6 #include <common.h>
   7
   8 #include <asm/io.h>
   9 #include <asm/types.h>
  10
  11 #include <mach/tlb.h>
  12 #include <mach/ddr.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 static inline int vcoreiii_train_bytelane(void)
  17 {
  18         int ret;
  19
  20         ret = hal_vcoreiii_train_bytelane(0);
  21
  22 #ifdef CONFIG_SOC_OCELOT
  23         if (ret)
  24                 return ret;
  25         ret = hal_vcoreiii_train_bytelane(1);
  26 #endif
  27
  28         return ret;
  29 }
  30
  31 int vcoreiii_ddr_init(void)
  32 {
  33         int res;
  34
  35         if (!(readl(BASE_CFG + ICPU_MEMCTRL_STAT)
  36               & ICPU_MEMCTRL_STAT_INIT_DONE)) {
  37                 hal_vcoreiii_init_memctl();
  38                 hal_vcoreiii_wait_memctl();
  39                 if (hal_vcoreiii_init_dqs() || vcoreiii_train_bytelane())
  40                         hal_vcoreiii_ddr_failed();
  41         }
  42 #if (CONFIG_SYS_TEXT_BASE != 0x20000000)
  43         res = dram_check();
  44         if (res == 0)
  45                 hal_vcoreiii_ddr_verified();
  46         else
  47                 hal_vcoreiii_ddr_failed();
  48
  49         /* Clear boot-mode and read-back to activate/verify */
  50         clrbits_le32(BASE_CFG + ICPU_GENERAL_CTRL,
  51                      ICPU_GENERAL_CTRL_BOOT_MODE_ENA);
  52         readl(BASE_CFG + ICPU_GENERAL_CTRL);
  53 #else
  54         res = 0;
  55 #endif
  56         return res;
  57 }
  58
  59 int print_cpuinfo(void)
  60 {
  61         printf("MSCC VCore-III MIPS 24Kec\n");
  62
  63         return 0;
  64 }
  65
  66 int dram_init(void)
  67 {
  68         while (vcoreiii_ddr_init())
  69                 ;
  70
  71         gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
  72         return 0;
  73 }