2 * Copyright (C) 2011-2014 Panasonic Corporation
3 * Copyright (C) 2015-2016 Socionext Inc.
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <linux/errno.h>
12 #include "ddrphy-init.h"
13 #include "ddrphy-regs.h"
15 /* for LD4, Pro4, sLD8 */
16 #define NR_DATX8_PER_DDRPHY 2
18 void ddrphy_prepare_training(void __iomem *phy_base, int rank)
20 void __iomem *dx_base = phy_base + PHY_DX_BASE;
24 for (dx = 0; dx < NR_DATX8_PER_DDRPHY; dx++) {
25 tmp = readl(dx_base + PHY_DX_GCR);
26 /* Specify the rank that should be write leveled */
27 tmp &= ~PHY_DX_GCR_WLRKEN_MASK;
28 tmp |= (1 << (PHY_DX_GCR_WLRKEN_SHIFT + rank)) &
29 PHY_DX_GCR_WLRKEN_MASK;
30 writel(tmp, dx_base + PHY_DX_GCR);
31 dx_base += PHY_DX_STRIDE;
34 tmp = readl(phy_base + PHY_DTCR);
35 /* Specify the rank used during data bit deskew and eye centering */
36 tmp &= ~PHY_DTCR_DTRANK_MASK;
37 tmp |= (rank << PHY_DTCR_DTRANK_SHIFT) & PHY_DTCR_DTRANK_MASK;
38 /* Use Multi-Purpose Register for DQS gate training */
39 tmp |= PHY_DTCR_DTMPR;
40 /* Specify the rank enabled for data-training */
41 tmp &= ~PHY_DTCR_RANKEN_MASK;
42 tmp |= (1 << (PHY_DTCR_RANKEN_SHIFT + rank)) & PHY_DTCR_RANKEN_MASK;
43 writel(tmp, phy_base + PHY_DTCR);
46 struct ddrphy_init_sequence {
53 static const struct ddrphy_init_sequence init_sequence[] = {
55 "DRAM Initialization",
56 PHY_PIR_DRAMRST | PHY_PIR_DRAMINIT,
67 "Read DQS Gate Training",
73 "Write Leveling Adjustment",
104 int ddrphy_training(void __iomem *phy_base)
108 u32 init_flag = PHY_PIR_INIT;
109 u32 done_flag = PHY_PGSR0_IDONE;
110 int timeout = 50000; /* 50 msec is long enough */
111 #ifdef DISPLAY_ELAPSED_TIME
112 ulong start = get_timer(0);
115 for (i = 0; i < ARRAY_SIZE(init_sequence); i++) {
116 init_flag |= init_sequence[i].init_flag;
117 done_flag |= init_sequence[i].done_flag;
120 writel(init_flag, phy_base + PHY_PIR);
124 printf("%s: error: timeout during DDR training\n",
129 pgsr0 = readl(phy_base + PHY_PGSR0);
130 } while ((pgsr0 & done_flag) != done_flag);
132 for (i = 0; i < ARRAY_SIZE(init_sequence); i++) {
133 if (pgsr0 & init_sequence[i].err_flag) {
134 printf("%s: error: %s failed\n", __func__,
135 init_sequence[i].description);
140 #ifdef DISPLAY_ELAPSED_TIME
141 printf("%s: info: elapsed time %ld msec\n", get_timer(start));