From 20c34115d603745cf276c683168292d02056791a Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Thu, 5 Feb 2015 23:42:28 +0800
Subject: [PATCH] x86: quark: Call MRC in dram_init()

Now that we have added Quark MRC codes, call MRC in dram_init() so
that DRAM can be initialized on a Quark based board.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
---
 arch/x86/cpu/quark/dram.c | 99 ++++++++++++++++++++++++++++++++++++++-
 arch/x86/dts/galileo.dts  | 25 ++++++++++
 2 files changed, 122 insertions(+), 2 deletions(-)

diff --git a/arch/x86/cpu/quark/dram.c b/arch/x86/cpu/quark/dram.c
index fbdc3cde05..9cac846c69 100644
--- a/arch/x86/cpu/quark/dram.c
+++ b/arch/x86/cpu/quark/dram.c
@@ -5,15 +5,110 @@
  */
 
 #include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
 #include <asm/post.h>
+#include <asm/arch/mrc.h>
 #include <asm/arch/quark.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+static int mrc_configure_params(struct mrc_params *mrc_params)
+{
+	const void *blob = gd->fdt_blob;
+	int node;
+	int mrc_flags;
+
+	node = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_QRK_MRC);
+	if (node < 0) {
+		debug("%s: Cannot find MRC node\n", __func__);
+		return -EINVAL;
+	}
+
+	/*
+	 * TODO:
+	 *
+	 * We need support fast boot (MRC cache) in the future.
+	 *
+	 * Set boot mode to cold boot for now
+	 */
+	mrc_params->boot_mode = BM_COLD;
+
+	/*
+	 * TODO:
+	 *
+	 * We need determine ECC by pin strap state
+	 *
+	 * Disable ECC by default for now
+	 */
+	mrc_params->ecc_enables = 0;
+
+	mrc_flags = fdtdec_get_int(blob, node, "flags", 0);
+	if (mrc_flags & MRC_FLAG_SCRAMBLE_EN)
+		mrc_params->scrambling_enables = 1;
+	else
+		mrc_params->scrambling_enables = 0;
+
+	mrc_params->dram_width = fdtdec_get_int(blob, node, "dram-width", 0);
+	mrc_params->ddr_speed = fdtdec_get_int(blob, node, "dram-speed", 0);
+	mrc_params->ddr_type = fdtdec_get_int(blob, node, "dram-type", 0);
+
+	mrc_params->rank_enables = fdtdec_get_int(blob, node, "rank-mask", 0);
+	mrc_params->channel_enables = fdtdec_get_int(blob, node,
+		"chan-mask", 0);
+	mrc_params->channel_width = fdtdec_get_int(blob, node,
+		"chan-width", 0);
+	mrc_params->address_mode = fdtdec_get_int(blob, node, "addr-mode", 0);
+
+	mrc_params->refresh_rate = fdtdec_get_int(blob, node,
+		"refresh-rate", 0);
+	mrc_params->sr_temp_range = fdtdec_get_int(blob, node,
+		"sr-temp-range", 0);
+	mrc_params->ron_value = fdtdec_get_int(blob, node,
+		"ron-value", 0);
+	mrc_params->rtt_nom_value = fdtdec_get_int(blob, node,
+		"rtt-nom-value", 0);
+	mrc_params->rd_odt_value = fdtdec_get_int(blob, node,
+		"rd-odt-value", 0);
+
+	mrc_params->params.density = fdtdec_get_int(blob, node,
+		"dram-density", 0);
+	mrc_params->params.cl = fdtdec_get_int(blob, node, "dram-cl", 0);
+	mrc_params->params.ras = fdtdec_get_int(blob, node, "dram-ras", 0);
+	mrc_params->params.wtr = fdtdec_get_int(blob, node, "dram-wtr", 0);
+	mrc_params->params.rrd = fdtdec_get_int(blob, node, "dram-rrd", 0);
+	mrc_params->params.faw = fdtdec_get_int(blob, node, "dram-faw", 0);
+
+	debug("MRC dram_width %d\n", mrc_params->dram_width);
+	debug("MRC rank_enables %d\n", mrc_params->rank_enables);
+	debug("MRC ddr_speed %d\n", mrc_params->ddr_speed);
+	debug("MRC flags: %s\n",
+	      (mrc_params->scrambling_enables) ? "SCRAMBLE_EN" : "");
+
+	debug("MRC density=%d tCL=%d tRAS=%d tWTR=%d tRRD=%d tFAW=%d\n",
+	      mrc_params->params.density, mrc_params->params.cl,
+	      mrc_params->params.ras, mrc_params->params.wtr,
+	      mrc_params->params.rrd, mrc_params->params.faw);
+
+	return 0;
+}
+
 int dram_init(void)
 {
-	/* hardcode the DRAM size for now */
-	gd->ram_size = DRAM_MAX_SIZE;
+	struct mrc_params mrc_params;
+	int ret;
+
+	memset(&mrc_params, 0, sizeof(struct mrc_params));
+	ret = mrc_configure_params(&mrc_params);
+	if (ret)
+		return ret;
+
+	/* Set up the DRAM by calling the memory reference code */
+	mrc_init(&mrc_params);
+	if (mrc_params.status)
+		return -EIO;
+
+	gd->ram_size = mrc_params.mem_size;
 	post_code(POST_DRAM);
 
 	return 0;
diff --git a/arch/x86/dts/galileo.dts b/arch/x86/dts/galileo.dts
index 14a19c3ec3..d462221a9d 100644
--- a/arch/x86/dts/galileo.dts
+++ b/arch/x86/dts/galileo.dts
@@ -6,6 +6,8 @@
 
 /dts-v1/;
 
+#include <dt-bindings/mrc/quark.h>
+
 /include/ "skeleton.dtsi"
 
 / {
@@ -20,6 +22,29 @@
 		stdout-path = &pciuart0;
 	};
 
+	mrc {
+		compatible = "intel,quark-mrc";
+		flags = <MRC_FLAG_SCRAMBLE_EN>;
+		dram-width = <DRAM_WIDTH_X8>;
+		dram-speed = <DRAM_FREQ_800>;
+		dram-type = <DRAM_TYPE_DDR3>;
+		rank-mask = <DRAM_RANK(0)>;
+		chan-mask = <DRAM_CHANNEL(0)>;
+		chan-width = <DRAM_CHANNEL_WIDTH_X16>;
+		addr-mode = <DRAM_ADDR_MODE0>;
+		refresh-rate = <DRAM_REFRESH_RATE_785US>;
+		sr-temp-range = <DRAM_SRT_RANGE_NORMAL>;
+		ron-value = <DRAM_RON_34OHM>;
+		rtt-nom-value = <DRAM_RTT_NOM_120OHM>;
+		rd-odt-value = <DRAM_RD_ODT_OFF>;
+		dram-density = <DRAM_DENSITY_1G>;
+		dram-cl = <6>;
+		dram-ras = <0x0000927c>;
+		dram-wtr = <0x00002710>;
+		dram-rrd = <0x00002710>;
+		dram-faw = <0x00009c40>;
+	};
+
 	pci {
 		#address-cells = <3>;
 		#size-cells = <2>;
-- 
2.39.5