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-rw-r--r--src/soc/intel/apollolake/Makefile.inc1
-rw-r--r--src/soc/intel/apollolake/northbridge.c115
2 files changed, 116 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/Makefile.inc b/src/soc/intel/apollolake/Makefile.inc
index 8581607934..4e057268a2 100644
--- a/src/soc/intel/apollolake/Makefile.inc
+++ b/src/soc/intel/apollolake/Makefile.inc
@@ -33,6 +33,7 @@ ramstage-$(CONFIG_SOC_UART_DEBUG) += uart_early.c
ramstage-y += memmap.c
ramstage-y += mmap_boot.c
ramstage-y += uart.c
+ramstage-y += northbridge.c
CPPFLAGS_common += -I$(src)/soc/intel/apollolake/include
diff --git a/src/soc/intel/apollolake/northbridge.c b/src/soc/intel/apollolake/northbridge.c
new file mode 100644
index 0000000000..35c36c88e2
--- /dev/null
+++ b/src/soc/intel/apollolake/northbridge.c
@@ -0,0 +1,115 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Intel Corp.
+ * (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
+ * (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for 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.
+ */
+
+#include <console/console.h>
+#include <soc/iomap.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <soc/northbridge.h>
+#include <soc/pci_ids.h>
+
+static uint32_t get_bar(device_t dev, unsigned int index)
+{
+ uint32_t bar;
+
+ bar = pci_read_config32(dev, index);
+
+ /* If not enabled return 0 else strip enabled bit */
+ return (bar & 1) ? (bar & ~1) : 0;
+}
+
+static int mc_add_fixed_mmio_resources(device_t dev, int index)
+{
+ /* PCI extended config region */
+ mmio_resource(dev, index++, ALIGN_DOWN(get_bar(dev, PCIEXBAR), 256*MiB),
+ PCIEX_SIZE / KiB);
+
+ /* Memory Controller Hub */
+ mmio_resource(dev, index++, ALIGN_DOWN(get_bar(dev, MCHBAR), 32*KiB),
+ MCH_BASE_SIZE / KiB);
+
+ return index;
+}
+
+
+static int mc_add_dram_resources(device_t dev, int index)
+{
+ unsigned long base_k, size_k;
+ uint32_t bgsm, bdsm, tolud, tseg;
+ uint64_t touud;
+
+ bgsm = ALIGN_DOWN(pci_read_config32(dev, BGSM), MiB);
+ bdsm = ALIGN_DOWN(pci_read_config32(dev, BDSM), MiB);
+ tolud = ALIGN_DOWN(pci_read_config32(dev, TOLUD), MiB);
+ tseg = ALIGN_DOWN(pci_read_config32(dev, TSEG), MiB);
+
+ /* TOUUD is naturally a 64 bit integer */
+ touud = pci_read_config32(dev, TOUUD + sizeof(uint32_t));
+ touud <<= 32;
+ touud |= ALIGN_DOWN(pci_read_config32(dev, TOUUD), MiB);
+
+ /* 0 - > 0xa0000: 640kb of DOS memory. Not enough for anybody nowadays */
+ ram_resource(dev, index++, 0, 640);
+
+ /* 0xc0000 -> top_of_ram, skipping the legacy VGA region */
+ base_k = 768;
+ size_k = (tseg / KiB) - base_k;
+ ram_resource(dev, index++, base_k, size_k);
+
+ /* TSEG -> BGSM */
+ reserved_ram_resource(dev, index++, tseg / KiB, (bgsm - tseg) / KiB);
+
+ /* BGSM -> BDSM */
+ mmio_resource(dev, index++, bgsm / KiB, (bdsm - bgsm) / KiB);
+
+ /* BDSM -> TOLUD */
+ mmio_resource(dev, index++, tolud / KiB, (tolud - bdsm) / KiB);
+
+ /* 4G -> TOUUD */
+ base_k = 4ULL*GiB / KiB;
+ size_k = (touud / KiB) - base_k;
+ ram_resource(dev, index++, base_k, size_k);
+
+ /* 0xa0000 - 0xbffff: legacy VGA */
+ mmio_resource(dev, index++, 640, 128);
+
+ return index;
+}
+
+static void northbridge_read_resources(device_t dev)
+{
+
+ int index = 0;
+ /* Read standard PCI resources. */
+ pci_dev_read_resources(dev);
+
+ /* Add all fixed MMIO resources. */
+ index = mc_add_fixed_mmio_resources(dev, index);
+
+ /* Calculate and add DRAM resources. */
+ mc_add_dram_resources(dev, index);
+}
+
+static struct device_operations northbridge_ops = {
+ .read_resources = northbridge_read_resources,
+ .set_resources = pci_dev_set_resources,
+ .enable_resources = pci_dev_enable_resources,
+ .init = DEVICE_NOOP,
+ .enable = DEVICE_NOOP
+};
+
+static const struct pci_driver northbridge_driver __pci_driver = {
+ .ops = &northbridge_ops,
+ .vendor = PCI_VENDOR_ID_INTEL,
+ .device = PCI_DEVICE_ID_APOLLOLAKE_NB
+};