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-rw-r--r--src/soc/intel/apollolake/Makefile.inc1
-rw-r--r--src/soc/intel/apollolake/uart.c56
2 files changed, 57 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/Makefile.inc b/src/soc/intel/apollolake/Makefile.inc
index 1b2efdf362..8581607934 100644
--- a/src/soc/intel/apollolake/Makefile.inc
+++ b/src/soc/intel/apollolake/Makefile.inc
@@ -32,6 +32,7 @@ ramstage-y += gpio.c
ramstage-$(CONFIG_SOC_UART_DEBUG) += uart_early.c
ramstage-y += memmap.c
ramstage-y += mmap_boot.c
+ramstage-y += uart.c
CPPFLAGS_common += -I$(src)/soc/intel/apollolake/include
diff --git a/src/soc/intel/apollolake/uart.c b/src/soc/intel/apollolake/uart.c
new file mode 100644
index 0000000000..2a32842cb3
--- /dev/null
+++ b/src/soc/intel/apollolake/uart.c
@@ -0,0 +1,56 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Intel Corp.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * The sole purpose of this driver is to avoid BAR to be changed during
+ * resource allocation. Since configuration space is just 32 bytes it
+ * shouldn't cause any fragmentation.
+ */
+
+#include <console/uart.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <soc/pci_ids.h>
+#include <soc/pci_devs.h>
+
+static void aplk_uart_read_resources(struct device *dev)
+{
+ pci_dev_read_resources(dev);
+
+ if ((IS_ENABLED(CONFIG_SOC_UART_DEBUG) &&
+ dev->path.pci.devfn == _LPSS_PCI_DEVFN(UART,
+ CONFIG_UART_FOR_CONSOLE))) {
+ /* will override existing resource. */
+ fixed_mem_resource(dev, PCI_BASE_ADDRESS_0,
+ CONFIG_CONSOLE_UART_BASE_ADDRESS >> 10, 4, 0);
+ }
+}
+
+static struct device_operations uart_ops = {
+ .read_resources = aplk_uart_read_resources,
+ .set_resources = DEVICE_NOOP,
+ .enable_resources = DEVICE_NOOP,
+ .init = pci_dev_init,
+ .enable = DEVICE_NOOP
+};
+
+static const unsigned short uart_ids[] = {
+ PCI_DEVICE_ID_APOLLOLAKE_UART0, PCI_DEVICE_ID_APOLLOLAKE_UART1,
+ PCI_DEVICE_ID_APOLLOLAKE_UART2, PCI_DEVICE_ID_APOLLOLAKE_UART3,
+ 0
+};
+
+static const struct pci_driver uart_driver __pci_driver = {
+ .ops = &uart_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .devices = uart_ids
+};