baytrail: add initial support

The initial Bay Trail code is intended to support
the mobile and desktop version of Bay Trail. This support
can train memory and execute through ramstage. However,
the resource allocation is not curently handled correctly.
The MRC cache parameters are successfully saved and reused
after the initial cold boot.

BUG=chrome-os-partner:22292
BRANCH=None
TEST=Built and booted on a reference board through ramstage.

Change-Id: I238ede326802aad272c6cca39d7ad4f161d813f5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/168387
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/4847
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/src/soc/intel/baytrail/romstage/raminit.c b/src/soc/intel/baytrail/romstage/raminit.c
new file mode 100644
index 0000000000..68836d3ada
--- /dev/null
+++ b/src/soc/intel/baytrail/romstage/raminit.c
@@ -0,0 +1,93 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stddef.h>
+#include <arch/io.h>
+#include <cbfs.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <device/pci_def.h>
+#include <baytrail/gpio.h>
+#include <baytrail/mrc_cache.h>
+#include <baytrail/iomap.h>
+#include <baytrail/pci_devs.h>
+#include <baytrail/romstage.h>
+
+
+static void enable_smbus(void)
+{
+	uint32_t reg;
+	const uint32_t smbus_dev = PCI_DEV(0, SMBUS_DEV, SMBUS_FUNC);
+
+	/* SMBus I/O BAR */
+	reg = SMBUS_BASE_ADDRESS | 2;
+	pci_write_config32(smbus_dev, PCI_BASE_ADDRESS_4, reg);
+	/* Enable decode of I/O space. */
+	reg = pci_read_config16(smbus_dev, PCI_COMMAND);
+	reg |= 0x1;
+	pci_write_config16(smbus_dev, PCI_COMMAND, reg);
+	/* Enable Host Controller */
+	reg = pci_read_config8(smbus_dev, 0x40);
+	reg |= 1;
+	pci_write_config8(smbus_dev, 0x40, reg);
+
+	/* Configure pads to be used for SMBus */
+	score_select_func(PCU_SMB_CLK_PAD, 1);
+	score_select_func(PCU_SMB_DATA_PAD, 1);
+}
+
+void raminit(struct mrc_params *mp, int prev_sleep_state)
+{
+	int ret;
+	mrc_wrapper_entry_t mrc_entry;
+	const struct mrc_saved_data *cache;
+
+	/* Fill in default entries. */
+	mp->version = MRC_PARAMS_VER;
+	mp->console_out = &console_tx_byte;
+	mp->prev_sleep_state = prev_sleep_state;
+
+	if (!mrc_cache_get_current(&cache)) {
+		mp->saved_data_size = cache->size;
+		mp->saved_data = &cache->data[0];
+	} else {
+		printk(BIOS_DEBUG, "No MRC cache found.\n");
+	}
+
+	mrc_entry = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, "mrc.bin", 0xab,
+					  NULL);
+
+	if (mrc_entry == NULL) {
+		printk(BIOS_DEBUG, "Couldn't find mrc.bin\n");
+		return;
+	}
+	if (mp->mainboard.dram_info_location == DRAM_INFO_SPD_SMBUS)
+		enable_smbus();
+
+	ret = mrc_entry(mp);
+
+	cbmem_initialize_empty();
+
+	printk(BIOS_DEBUG, "MRC Wrapper returned %d\n", ret);
+	printk(BIOS_DEBUG, "MRC data at %p %d bytes\n", mp->data_to_save,
+	       mp->data_to_save_size);
+
+	if (mp->data_to_save != NULL && mp->data_to_save_size > 0)
+		mrc_cache_stash_data(mp->data_to_save, mp->data_to_save_size);
+}