baytrail: initialize eMMC device

The eMMC device is initialized as version 4.5 with HS200 speeds.

BUG=chrome-os-partner:23966
BRANCH=None
TEST=Built and booted rambi to login screen off of eMMC device.

Change-Id: I686c6136005fcb2587b939ddea293f4398df9868
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/176536
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/4967
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

2 files changed, 76 insertions, 0 deletions

diff --git a/src/soc/intel/baytrail/Makefile.inc b/src/soc/intel/baytrail/Makefile.inc
index c7e3843acb..a6560ff26d 100644
--- a/src/soc/intel/baytrail/Makefile.inc
+++ b/src/soc/intel/baytrail/Makefile.inc
@@ -40,6 +40,7 @@ ramstage-y += sata.c
 ramstage-y += acpi.c
 ramstage-y += lpe.c
 ramstage-y += scc.c
+ramstage-y += emmc.c
 
 # Remove as ramstage gets fleshed out
 ramstage-y += placeholders.c
diff --git a/src/soc/intel/baytrail/emmc.c b/src/soc/intel/baytrail/emmc.c
new file mode 100644
index 0000000000..18c16e8bec
--- /dev/null
+++ b/src/soc/intel/baytrail/emmc.c
@@ -0,0 +1,75 @@
+/*
+ * 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 <stdint.h>
+#include <arch/io.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <reg_script.h>
+
+#include <baytrail/iosf.h>
+#include <baytrail/pci_devs.h>
+#include <baytrail/ramstage.h>
+
+static const struct reg_script emmc_ops[] = {
+	/* Enable 2ms card stable feature. */
+	REG_PCI_OR32(0xa8, (1 << 24)),
+	/* Enable HS200 */
+	REG_PCI_WRITE32(0xa0, 0x446cc801),
+	REG_PCI_WRITE32(0xa4, 0x80000807),
+	/* cfio_regs_score_special_bits.sdio1_dummy_loopback_en=1 */
+	REG_IOSF_OR(IOSF_PORT_SCORE, 0x49c0, (1 << 3)),
+	/* CLKGATE_EN_1 . cr_scc_mipihsi_clkgate_en  = 1 */
+	REG_IOSF_RMW(IOSF_PORT_CCU, 0x1c, ~(3 << 26), (1 << 26)),
+	/* Set slew for HS200 */
+	REG_IOSF_RMW(IOSF_PORT_SCORE, 0x48c0, ~0x3c, 0x3c),
+	REG_IOSF_RMW(IOSF_PORT_SCORE, 0x48c4, ~0x3c, 0x3c),
+	/* Max timeout */
+	REG_RES_WRITE8(PCI_BASE_ADDRESS_0, 0x002e, 0x0e),
+	REG_SCRIPT_END,
+};
+
+static void emmc_init(device_t dev)
+{
+	struct reg_script ops[] = {
+		REG_SCRIPT_SET_DEV(dev),
+		REG_SCRIPT_NEXT(emmc_ops),
+		REG_SCRIPT_END,
+	};
+	printk(BIOS_DEBUG, "eMMC init\n");
+	reg_script_run(ops);
+}
+
+static struct device_operations device_ops = {
+	.read_resources		= pci_dev_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.init			= emmc_init,
+	.enable			= NULL,
+	.scan_bus		= NULL,
+	.ops_pci		= &soc_pci_ops,
+};
+
+static const struct pci_driver southcluster __pci_driver = {
+	.ops		= &device_ops,
+	.vendor		= PCI_VENDOR_ID_INTEL,
+	.device		= MMC_DEVID,
+};