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authorAaron Durbin <adurbin@chromium.org>2013-11-01 14:36:03 -0500
committerAaron Durbin <adurbin@google.com>2014-03-11 19:54:58 +0100
commit97651c55a3058bfedacdeb6de6243087d1dc5b7a (patch)
tree5dffb3256522b47ff9eb4c69042074f5464055c5 /src
parent65ad521f8a19ec42c1bafa6777eb927fa55261a2 (diff)
downloadcoreboot-97651c55a3058bfedacdeb6de6243087d1dc5b7a.tar.xz
baytrail: add audio clock workaround for LPE
Apparently the LPE device needs a 25MHz clock. Provide the work around to enable this clock. BUG=chrome-os-partner:23791 BRANCH=None TEST=Built and booted. Confirmed setting being applied. Change-Id: Ibff5563436b3025eb8b61ffee3302bd2da872b39 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/175493 Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: http://review.coreboot.org/4928 Tested-by: build bot (Jenkins) Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Diffstat (limited to 'src')
-rw-r--r--src/soc/intel/baytrail/Makefile.inc1
-rw-r--r--src/soc/intel/baytrail/lpe.c53
2 files changed, 54 insertions, 0 deletions
diff --git a/src/soc/intel/baytrail/Makefile.inc b/src/soc/intel/baytrail/Makefile.inc
index d41405766e..2149e975ce 100644
--- a/src/soc/intel/baytrail/Makefile.inc
+++ b/src/soc/intel/baytrail/Makefile.inc
@@ -35,6 +35,7 @@ ramstage-y += southcluster.c
ramstage-$(CONFIG_HAVE_REFCODE_BLOB) += refcode.c
ramstage-y += sata.c
ramstage-y += acpi.c
+ramstage-y += lpe.c
# Remove as ramstage gets fleshed out
ramstage-y += placeholders.c
diff --git a/src/soc/intel/baytrail/lpe.c b/src/soc/intel/baytrail/lpe.c
new file mode 100644
index 0000000000..e422ff6262
--- /dev/null
+++ b/src/soc/intel/baytrail/lpe.c
@@ -0,0 +1,53 @@
+/*
+ * 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 <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+
+#include <baytrail/iosf.h>
+#include <baytrail/ramstage.h>
+
+static void lpe_init(device_t dev)
+{
+ uint32_t reg;
+
+ /* Work around for Audio Clock. */
+ reg = iosf_ccu_read(PLT_CLK_CTRL_3);
+ reg &= ~0xff;
+ reg |= PLT_CLK_CTRL_25MHZ_FREQ | PLT_CLK_CTRL_SELECT_FREQ;
+ iosf_ccu_write(PLT_CLK_CTRL_3, reg);
+}
+
+static const struct device_operations device_ops = {
+ .read_resources = pci_dev_read_resources,
+ .set_resources = pci_dev_set_resources,
+ .enable_resources = NULL,
+ .init = lpe_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 = LPE_DEVID,
+};