summaryrefslogtreecommitdiff
path: root/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-uniphier/ddrphy/ddrphy-training.c')
-rw-r--r--arch/arm/mach-uniphier/ddrphy/ddrphy-training.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c b/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c
new file mode 100644
index 0000000..a98b814
--- /dev/null
+++ b/arch/arm/mach-uniphier/ddrphy/ddrphy-training.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2011-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/io.h>
+#include <mach/ddrphy-regs.h>
+
+void ddrphy_prepare_training(struct ddrphy __iomem *phy, int rank)
+{
+ int dx;
+ u32 __iomem tmp, *p;
+
+ for (dx = 0; dx < NR_DATX8_PER_DDRPHY; dx++) {
+ p = &phy->dx[dx].gcr;
+
+ tmp = readl(p);
+ /* Specify the rank that should be write leveled */
+ tmp &= ~DXGCR_WLRKEN_MASK;
+ tmp |= (1 << (DXGCR_WLRKEN_SHIFT + rank)) & DXGCR_WLRKEN_MASK;
+ writel(tmp, p);
+ }
+
+ p = &phy->dtcr;
+
+ tmp = readl(p);
+ /* Specify the rank used during data bit deskew and eye centering */
+ tmp &= ~DTCR_DTRANK_MASK;
+ tmp |= (rank << DTCR_DTRANK_SHIFT) & DTCR_DTRANK_MASK;
+ /* Use Multi-Purpose Register for DQS gate training */
+ tmp |= DTCR_DTMPR;
+ /* Specify the rank enabled for data-training */
+ tmp &= ~DTCR_RNKEN_MASK;
+ tmp |= (1 << (DTCR_RNKEN_SHIFT + rank)) & DTCR_RNKEN_MASK;
+ writel(tmp, p);
+}
+
+struct ddrphy_init_sequence {
+ char *description;
+ u32 init_flag;
+ u32 done_flag;
+ u32 err_flag;
+};
+
+static struct ddrphy_init_sequence init_sequence[] = {
+ {
+ "DRAM Initialization",
+ PIR_DRAMRST | PIR_DRAMINIT,
+ PGSR0_DIDONE,
+ PGSR0_DIERR
+ },
+ {
+ "Write Leveling",
+ PIR_WL,
+ PGSR0_WLDONE,
+ PGSR0_WLERR
+ },
+ {
+ "Read DQS Gate Training",
+ PIR_QSGATE,
+ PGSR0_QSGDONE,
+ PGSR0_QSGERR
+ },
+ {
+ "Write Leveling Adjustment",
+ PIR_WLADJ,
+ PGSR0_WLADONE,
+ PGSR0_WLAERR
+ },
+ {
+ "Read Bit Deskew",
+ PIR_RDDSKW,
+ PGSR0_RDDONE,
+ PGSR0_RDERR
+ },
+ {
+ "Write Bit Deskew",
+ PIR_WRDSKW,
+ PGSR0_WDDONE,
+ PGSR0_WDERR
+ },
+ {
+ "Read Eye Training",
+ PIR_RDEYE,
+ PGSR0_REDONE,
+ PGSR0_REERR
+ },
+ {
+ "Write Eye Training",
+ PIR_WREYE,
+ PGSR0_WEDONE,
+ PGSR0_WEERR
+ }
+};
+
+int ddrphy_training(struct ddrphy __iomem *phy)
+{
+ int i;
+ u32 pgsr0;
+ u32 init_flag = PIR_INIT;
+ u32 done_flag = PGSR0_IDONE;
+ int timeout = 50000; /* 50 msec is long enough */
+#ifdef DISPLAY_ELAPSED_TIME
+ ulong start = get_timer(0);
+#endif
+
+ for (i = 0; i < ARRAY_SIZE(init_sequence); i++) {
+ init_flag |= init_sequence[i].init_flag;
+ done_flag |= init_sequence[i].done_flag;
+ }
+
+ writel(init_flag, &phy->pir);
+
+ do {
+ if (--timeout < 0) {
+ printf("%s: error: timeout during DDR training\n",
+ __func__);
+ return -1;
+ }
+ udelay(1);
+ pgsr0 = readl(&phy->pgsr[0]);
+ } while ((pgsr0 & done_flag) != done_flag);
+
+ for (i = 0; i < ARRAY_SIZE(init_sequence); i++) {
+ if (pgsr0 & init_sequence[i].err_flag) {
+ printf("%s: error: %s failed\n", __func__,
+ init_sequence[i].description);
+ return -1;
+ }
+ }
+
+#ifdef DISPLAY_ELAPSED_TIME
+ printf("%s: info: elapsed time %ld msec\n", get_timer(start));
+#endif
+
+ return 0;
+}