nb/intel/sandybridge/raminit: move ram training into seperate function

In order to add a fallback mechanism, move the ram training code
into a new function. This function will be called multiple times
and must return error or success to the calling function.

Change-Id: I5ee1b3a528290d8252d236b9152b81291736958a
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/14169
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 90 insertions, 82 deletions

diff --git a/src/northbridge/intel/sandybridge/raminit.c b/src/northbridge/intel/sandybridge/raminit.c
index 7d946af049..dbec9fb8c8 100644
--- a/src/northbridge/intel/sandybridge/raminit.c
+++ b/src/northbridge/intel/sandybridge/raminit.c
@@ -3946,88 +3946,32 @@ static void restore_timings(ramctr_timing * ctrl)
 	write32(DEFAULT_MCHBAR + 0x4ea8, 0);
 }
 
-void init_dram_ddr3(spd_raw_data * spds, int mobile, int min_tck,
-	int s3resume)
+static int try_init_dram_ddr3(ramctr_timing *ctrl, int s3resume,
+		int me_uma_size)
 {
-	int me_uma_size;
-	int cbmem_was_inited;
-	ramctr_timing ctrl;
-
-	MCHBAR32(0x5f00) |= 1;
-
-	report_platform_info();
-
-	/* Wait for ME to be ready */
-	intel_early_me_init();
-	me_uma_size = intel_early_me_uma_size();
-
-	printk(BIOS_DEBUG, "Starting native Platform init\n");
-
-	u32 reg_5d10;
-
-	wait_txt_clear();
-
-	wrmsr(0x000002e6, (msr_t) { .lo = 0, .hi = 0 });
-
-	reg_5d10 = read32(DEFAULT_MCHBAR + 0x5d10);	// !!! = 0x00000000
-	if ((pcie_read_config16(SOUTHBRIDGE, 0xa2) & 0xa0) == 0x20	/* 0x0004 */
-	    && reg_5d10 && !s3resume) {
-		write32(DEFAULT_MCHBAR + 0x5d10, 0);
-		/* Need reset.  */
-		outb(0x6, 0xcf9);
-
-		halt();
-	}
-
-	memset(&ctrl, 0, sizeof (ctrl));
-
-	early_pch_init_native();
-	early_thermal_init();
-
-	ctrl.mobile = mobile;
-	ctrl.tCK = min_tck;
-
-	/* FIXME: for non-S3 we should be able to use timing caching with
-	   proper verification. Right now we use timings only for S3 case.
-	 */
-	if (s3resume) {
-		struct mrc_data_container *mrc_cache;
-
-		mrc_cache = find_current_mrc_cache();
-		if (!mrc_cache || mrc_cache->mrc_data_size < sizeof (ctrl)) {
-			/* Failed S3 resume, reset to come up cleanly */
-			outb(0x6, 0xcf9);
-			halt();
-		}
-		memcpy(&ctrl, mrc_cache->mrc_data, sizeof (ctrl));
-	}
-
 	if (!s3resume) {
-		/* Get DDR3 SPD data */
-		dram_find_spds_ddr3(spds, &ctrl);
-
 		/* Find fastest common supported parameters */
-		dram_find_common_params(&ctrl);
+		dram_find_common_params(ctrl);
 
-		dram_dimm_mapping(&ctrl);
+		dram_dimm_mapping(ctrl);
 	}
 
 	/* Set MCU frequency */
-	dram_freq(&ctrl);
+	dram_freq(ctrl);
 
 	if (!s3resume) {
 		/* Calculate timings */
-		dram_timing(&ctrl);
+		dram_timing(ctrl);
 	}
 
 	/* Set version register */
 	MCHBAR32(0x5034) = 0xC04EB002;
 
 	/* Enable crossover */
-	dram_xover(&ctrl);
+	dram_xover(ctrl);
 
 	/* Set timing and refresh registers */
-	dram_timing_regs(&ctrl);
+	dram_timing_regs(ctrl);
 
 	/* Power mode preset */
 	MCHBAR32(0x4e80) = 0x5500;
@@ -4042,64 +3986,128 @@ void init_dram_ddr3(spd_raw_data * spds, int mobile, int min_tck,
 	MCHBAR32(0x5030) &= ~0x20;
 
 	/* Set MAD-DIMM registers */
-	dram_dimm_set_mapping(&ctrl);
+	dram_dimm_set_mapping(ctrl);
 	printk(BIOS_DEBUG, "Done dimm mapping\n");
 
 	/* Zone config */
-	dram_zones(&ctrl, 1);
+	dram_zones(ctrl, 1);
 
 	/* Set memory map */
-	dram_memorymap(&ctrl, me_uma_size);
+	dram_memorymap(ctrl, me_uma_size);
 	printk(BIOS_DEBUG, "Done memory map\n");
 
 	/* Set IO registers */
-	dram_ioregs(&ctrl);
+	dram_ioregs(ctrl);
 	printk(BIOS_DEBUG, "Done io registers\n");
 
 	udelay(1);
 
 	if (s3resume) {
-		restore_timings(&ctrl);
+		restore_timings(ctrl);
 	} else {
 		/* Do jedec ddr3 reset sequence */
-		dram_jedecreset(&ctrl);
+		dram_jedecreset(ctrl);
 		printk(BIOS_DEBUG, "Done jedec reset\n");
 
 		/* MRS commands */
-		dram_mrscommands(&ctrl);
+		dram_mrscommands(ctrl);
 		printk(BIOS_DEBUG, "Done MRS commands\n");
 
 		/* Prepare for memory training */
-		prepare_training(&ctrl);
+		prepare_training(ctrl);
 
-		read_training(&ctrl);
-		write_training(&ctrl);
+		read_training(ctrl);
+		write_training(ctrl);
 
 		printram("CP5a\n");
 
-		discover_edges(&ctrl);
+		discover_edges(ctrl);
 
 		printram("CP5b\n");
 
-		command_training(&ctrl);
+		command_training(ctrl);
 
 		printram("CP5c\n");
 
-		discover_edges_write(&ctrl);
+		discover_edges_write(ctrl);
 
-		discover_timC_write(&ctrl);
+		discover_timC_write(ctrl);
 
-		normalize_training(&ctrl);
+		normalize_training(ctrl);
 	}
 
-	set_4008c(&ctrl);
+	set_4008c(ctrl);
 
-	write_controller_mr(&ctrl);
+	write_controller_mr(ctrl);
 
 	if (!s3resume) {
-		channel_test(&ctrl);
+		channel_test(ctrl);
+	}
+
+	return 0;
+}
+
+void init_dram_ddr3(spd_raw_data *spds, int mobile, int min_tck,
+	int s3resume)
+{
+	int me_uma_size;
+	int cbmem_was_inited;
+	ramctr_timing ctrl;
+
+	MCHBAR32(0x5f00) |= 1;
+
+	report_platform_info();
+
+	/* Wait for ME to be ready */
+	intel_early_me_init();
+	me_uma_size = intel_early_me_uma_size();
+
+	printk(BIOS_DEBUG, "Starting native Platform init\n");
+
+	u32 reg_5d10;
+
+	wait_txt_clear();
+
+	wrmsr(0x000002e6, (msr_t) { .lo = 0, .hi = 0 });
+
+	reg_5d10 = read32(DEFAULT_MCHBAR + 0x5d10);	// !!! = 0x00000000
+	if ((pcie_read_config16(SOUTHBRIDGE, 0xa2) & 0xa0) == 0x20	/* 0x0004 */
+	    && reg_5d10 && !s3resume) {
+		write32(DEFAULT_MCHBAR + 0x5d10, 0);
+		/* Need reset.  */
+		outb(0x6, 0xcf9);
+
+		halt();
+	}
+
+	memset(&ctrl, 0, sizeof (ctrl));
+
+	early_pch_init_native();
+	early_thermal_init();
+
+	ctrl.mobile = mobile;
+	ctrl.tCK = min_tck;
+
+	/* FIXME: for non-S3 we should be able to use timing caching with
+	   proper verification. Right now we use timings only for S3 case.
+	 */
+	if (s3resume) {
+		struct mrc_data_container *mrc_cache;
+
+		mrc_cache = find_current_mrc_cache();
+		if (!mrc_cache || (mrc_cache->mrc_data_size < sizeof(ctrl))) {
+			/* Failed S3 resume, reset to come up cleanly */
+			outb(0x6, 0xcf9);
+			halt();
+		}
+		memcpy(&ctrl, mrc_cache->mrc_data, sizeof(ctrl));
+	} else {
+		/* Get DDR3 SPD data */
+		dram_find_spds_ddr3(spds, &ctrl);
 	}
 
+	try_init_dram_ddr3(&ctrl, s3resume, me_uma_size);
+
 	/* FIXME: should be hardware revision-dependent.  */
 	write32(DEFAULT_MCHBAR + 0x5024, 0x00a030ce);