From 2fc2b83a7da61d81eee9ceaad9b3b07174838793 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Mon, 12 Oct 2015 01:30:42 -0700
Subject: x86: quark: Implement mrc cache

Using existing mrccache library to implement mrc cache support
for Intel Quark.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
---
 arch/x86/cpu/quark/dram.c  | 52 +++++++++++++++++++++++++++++++++++++++-------
 arch/x86/cpu/quark/quark.c | 19 +++++++++++++++++
 2 files changed, 64 insertions(+), 7 deletions(-)

(limited to 'arch/x86/cpu/quark')

diff --git a/arch/x86/cpu/quark/dram.c b/arch/x86/cpu/quark/dram.c
index 1b89376387..40c830af96 100644
--- a/arch/x86/cpu/quark/dram.c
+++ b/arch/x86/cpu/quark/dram.c
@@ -7,6 +7,8 @@
 #include <common.h>
 #include <errno.h>
 #include <fdtdec.h>
+#include <malloc.h>
+#include <asm/mrccache.h>
 #include <asm/mtrr.h>
 #include <asm/post.h>
 #include <asm/arch/mrc.h>
@@ -15,6 +17,29 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+static __maybe_unused int prepare_mrc_cache(struct mrc_params *mrc_params)
+{
+	struct mrc_data_container *cache;
+	struct mrc_region entry;
+	int ret;
+
+	ret = mrccache_get_region(NULL, &entry);
+	if (ret)
+		return ret;
+
+	cache = mrccache_find_current(&entry);
+	if (!cache)
+		return -ENOENT;
+
+	debug("%s: mrc cache at %p, size %x checksum %04x\n", __func__,
+	      cache->data, cache->data_size, cache->checksum);
+
+	/* copy mrc cache to the mrc_params */
+	memcpy(&mrc_params->timings, cache->data, cache->data_size);
+
+	return 0;
+}
+
 static int mrc_configure_params(struct mrc_params *mrc_params)
 {
 	const void *blob = gd->fdt_blob;
@@ -27,14 +52,15 @@ static int mrc_configure_params(struct mrc_params *mrc_params)
 		return -EINVAL;
 	}
 
-	/*
-	 * TODO:
-	 *
-	 * We need support fast boot (MRC cache) in the future.
-	 *
-	 * Set boot mode to cold boot for now
-	 */
+#ifdef CONFIG_ENABLE_MRC_CACHE
+	mrc_params->boot_mode = prepare_mrc_cache(mrc_params);
+	if (mrc_params->boot_mode)
+		mrc_params->boot_mode = BM_COLD;
+	else
+		mrc_params->boot_mode = BM_FAST;
+#else
 	mrc_params->boot_mode = BM_COLD;
+#endif
 
 	/*
 	 * TODO:
@@ -98,6 +124,9 @@ static int mrc_configure_params(struct mrc_params *mrc_params)
 int dram_init(void)
 {
 	struct mrc_params mrc_params;
+#ifdef CONFIG_ENABLE_MRC_CACHE
+	char *cache;
+#endif
 	int ret;
 
 	memset(&mrc_params, 0, sizeof(struct mrc_params));
@@ -121,6 +150,15 @@ int dram_init(void)
 		       (~(gd->ram_size - 1)) | MTRR_PHYS_MASK_VALID);
 	enable_caches();
 
+#ifdef CONFIG_ENABLE_MRC_CACHE
+	cache = malloc(sizeof(struct mrc_timings));
+	if (cache) {
+		memcpy(cache, &mrc_params.timings, sizeof(struct mrc_timings));
+		gd->arch.mrc_output = cache;
+		gd->arch.mrc_output_len = sizeof(struct mrc_timings);
+	}
+#endif
+
 	return 0;
 }
 
diff --git a/arch/x86/cpu/quark/quark.c b/arch/x86/cpu/quark/quark.c
index 77d644a491..f737e1921f 100644
--- a/arch/x86/cpu/quark/quark.c
+++ b/arch/x86/cpu/quark/quark.c
@@ -8,6 +8,7 @@
 #include <mmc.h>
 #include <asm/io.h>
 #include <asm/irq.h>
+#include <asm/mrccache.h>
 #include <asm/mtrr.h>
 #include <asm/pci.h>
 #include <asm/post.h>
@@ -368,6 +369,15 @@ void cpu_irq_init(void)
 
 int arch_misc_init(void)
 {
+#ifdef CONFIG_ENABLE_MRC_CACHE
+	/*
+	 * We intend not to check any return value here, as even MRC cache
+	 * is not saved successfully, it is not a severe error that will
+	 * prevent system from continuing to boot.
+	 */
+	mrccache_save();
+#endif
+
 	return pirq_init();
 }
 
@@ -390,3 +400,12 @@ void board_final_cleanup(void)
 
 	return;
 }
+
+int reserve_arch(void)
+{
+#ifdef CONFIG_ENABLE_MRC_CACHE
+	return mrccache_reserve();
+#else
+	return 0;
+#endif
+}
-- 
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