arch/arm/mach-uniphier/dram/ddrphy-ld4.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2014      Panasonic Corporation
   4  * Copyright (C) 2015-2016 Socionext Inc.
   5  */
   6
   7 #include <linux/bitops.h>
   8 #include <linux/errno.h>
   9 #include <linux/io.h>
  10 #include <linux/printk.h>
  11
  12 #include "ddrphy-init.h"
  13 #include "ddrphy-regs.h"
  14
  15 enum dram_freq {
  16         DRAM_FREQ_1333M,
  17         DRAM_FREQ_1600M,
  18         DRAM_FREQ_NR,
  19 };
  20
  21 static u32 ddrphy_ptr0[DRAM_FREQ_NR] = {0x0a806844, 0x0c807d04};
  22 static u32 ddrphy_ptr1[DRAM_FREQ_NR] = {0x208e0124, 0x2710015E};
  23 static u32 ddrphy_ptr3[DRAM_FREQ_NR] = {0x0f051616, 0x12061A80};
  24 static u32 ddrphy_ptr4[DRAM_FREQ_NR] = {0x06ae08d6, 0x08027100};
  25 static u32 ddrphy_dtpr0[DRAM_FREQ_NR] = {0x85589955, 0x999cbb66};
  26 static u32 ddrphy_dtpr1[DRAM_FREQ_NR] = {0x1a8363c0, 0x1a878400};
  27 static u32 ddrphy_dtpr2[DRAM_FREQ_NR] = {0x5002c200, 0xa00214f8};
  28 static u32 ddrphy_mr0[DRAM_FREQ_NR] = {0x00000b51, 0x00000d71};
  29 static u32 ddrphy_mr2[DRAM_FREQ_NR] = {0x00000290, 0x00000298};
  30
  31 int uniphier_ld4_ddrphy_init(void __iomem *phy_base, int freq, bool ddr3plus)
  32 {
  33         enum dram_freq freq_e;
  34         u32 tmp;
  35
  36         switch (freq) {
  37         case 1333:
  38                 freq_e = DRAM_FREQ_1333M;
  39                 break;
  40         case 1600:
  41                 freq_e = DRAM_FREQ_1600M;
  42                 break;
  43         default:
  44                 pr_err("unsupported DRAM frequency %d MHz\n", freq);
  45                 return -EINVAL;
  46         }
  47
  48         writel(0x0300c473, phy_base + PHY_PGCR1);
  49         writel(ddrphy_ptr0[freq_e], phy_base + PHY_PTR0);
  50         writel(ddrphy_ptr1[freq_e], phy_base + PHY_PTR1);
  51         writel(0x00083DEF, phy_base + PHY_PTR2);
  52         writel(ddrphy_ptr3[freq_e], phy_base + PHY_PTR3);
  53         writel(ddrphy_ptr4[freq_e], phy_base + PHY_PTR4);
  54         writel(0xF004001A, phy_base + PHY_DSGCR);
  55
  56         /* change the value of the on-die pull-up/pull-down registors */
  57         tmp = readl(phy_base + PHY_DXCCR);
  58         tmp &= ~0x0ee0;
  59         tmp |= PHY_DXCCR_DQSNRES_688_OHM | PHY_DXCCR_DQSRES_688_OHM;
  60         writel(tmp, phy_base + PHY_DXCCR);
  61
  62         writel(0x0000040B, phy_base + PHY_DCR);
  63         writel(ddrphy_dtpr0[freq_e], phy_base + PHY_DTPR0);
  64         writel(ddrphy_dtpr1[freq_e], phy_base + PHY_DTPR1);
  65         writel(ddrphy_dtpr2[freq_e], phy_base + PHY_DTPR2);
  66         writel(ddrphy_mr0[freq_e], phy_base + PHY_MR0);
  67         writel(0x00000006, phy_base + PHY_MR1);
  68         writel(ddrphy_mr2[freq_e], phy_base + PHY_MR2);
  69         writel(ddr3plus ? 0x00000800 : 0x00000000, phy_base + PHY_MR3);
  70
  71         while (!(readl(phy_base + PHY_PGSR0) & PHY_PGSR0_IDONE))
  72                 ;
  73
  74         writel(0x0300C473, phy_base + PHY_PGCR1);
  75         writel(0x0000005D, phy_base + PHY_ZQ_BASE + PHY_ZQ_CR1);
  76
  77         return 0;
  78 }