baytrail: set host memory map

Prior to this commit the coreboot resource allocator
was not using proper addresses. That's not surprising there
wasn't any code to initialize the resources properly. This
commit initializes the memory map accoring to the BUNIT
registers.

BUG=chrome-os-partner:22860
BUG=chrome-os-partner:22862
BRANCH=None
TEST=Built and booted. Noted output for resource assignments
     is sane.

Change-Id: Ice8d067d8b993736de5c5b273a0f642fa034a024
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/170429
Reviewed-on: http://review.coreboot.org/4852
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

2 files changed, 150 insertions, 0 deletions

diff --git a/src/soc/intel/baytrail/Makefile.inc b/src/soc/intel/baytrail/Makefile.inc
index 90b39ebba4..d8dcaf6f41 100644
--- a/src/soc/intel/baytrail/Makefile.inc
+++ b/src/soc/intel/baytrail/Makefile.inc
@@ -15,6 +15,7 @@ ramstage-y += spi.c
 ramstage-y += chip.c
 ramstage-y += iosf.c
 romstage-y += iosf.c
+ramstage-y += northcluster.c
 
 
 # Remove as ramstage gets fleshed out
diff --git a/src/soc/intel/baytrail/northcluster.c b/src/soc/intel/baytrail/northcluster.c
new file mode 100644
index 0000000000..0616e5d168
--- /dev/null
+++ b/src/soc/intel/baytrail/northcluster.c
@@ -0,0 +1,149 @@
+/*
+ * 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 <cpu/x86/smm.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+
+#include <baytrail/iosf.h>
+#include <baytrail/pci_devs.h>
+#include <baytrail/ramstage.h>
+
+/* Host Memory Map:
+ *
+ * +--------------------------+ BMBOUND_HI
+ * |     Usable DRAM          |
+ * +--------------------------+ 4GiB
+ * |     PCI Address Space    |
+ * +--------------------------+ BMBOUND
+ * |     TPM                  |
+ * +--------------------------+ IMR2
+ * |     TXE                  |
+ * +--------------------------+ IMR1
+ * |     iGD                  |
+ * +--------------------------+
+ * |     GTT                  |
+ * +--------------------------+ SMMRRH, IRM0
+ * |     TSEG                 |
+ * +--------------------------+ SMMRRL
+ * |     Usable DRAM          |
+ * +--------------------------+ 0
+ *
+ * Note that there are really only a few regions that need to enumerated w.r.t.
+ * coreboot's resrouce model:
+ *
+ * +--------------------------+ BMBOUND_HI
+ * |     Cacheable/Usable     |
+ * +--------------------------+ 4GiB
+ *
+ * +--------------------------+ BMBOUND
+ * |    Uncacheable/Reserved  |
+ * +--------------------------+ SMMRRH
+ * |    Cacheable/Reserved    |
+ * +--------------------------+ SMMRRL
+ * |     Cacheable/Usable     |
+ * +--------------------------+ 0
+ */
+#define RES_IN_KiB(r) ((r) >> 10)
+
+static void soc_trans_router_read_resources(device_t dev)
+{
+	unsigned long mmconf;
+	unsigned long bmbound;
+	unsigned long bmbound_hi;
+	unsigned long smmrrh;
+	unsigned long smmrrl;
+	unsigned long base_k, size_k;
+	const unsigned long four_gig_kib = (4 << (30 - 10));
+	int index = 0;
+
+	/* Read standard PCI resources. */
+	pci_dev_read_resources(dev);
+
+	/* PCIe memory-mapped config space access - 256 MiB. */
+	mmconf = iosf_bunit_read(BUNIT_MMCONF_REG) & ~((1 << 28) - 1);
+	mmio_resource(dev, BUNIT_MMCONF_REG, RES_IN_KiB(mmconf), 256 * 1024);
+
+	/* 0 -> SMM_DEFAULT_BASE cacheable ram. */
+	ram_resource(dev, index++, 0, RES_IN_KiB(SMM_DEFAULT_BASE));
+	/* Default SMM region is cacheable but reserved for coreboot */
+	reserved_ram_resource(dev, index++, RES_IN_KiB(SMM_DEFAULT_BASE),
+	                      RES_IN_KiB(SMM_DEFAULT_SIZE));
+
+	/* SMM_DEFAULT_BASE + SMM_DEFAULT_SIZE - > 0xa0000 */
+	base_k = RES_IN_KiB(SMM_DEFAULT_BASE + SMM_DEFAULT_SIZE);
+	size_k = RES_IN_KiB(0xa0000) - base_k;
+	ram_resource(dev, index++, base_k, size_k);
+
+	/* The SMMRR registers are 1MiB granularity with smmrrh being
+	 * inclusive of the SMM region. */
+	smmrrl = (iosf_bunit_read(BUNIT_SMRRL) & 0xffff) << 10;
+	smmrrh = ((iosf_bunit_read(BUNIT_SMRRH) & 0xffff) + 1) << 10;
+
+	/* 0xc0000 -> smrrl - cacheable and usable */
+	base_k = RES_IN_KiB(0xc0000);
+	size_k = smmrrl - base_k;
+	ram_resource(dev, index++, base_k, size_k);
+
+	if (smmrrh > smmrrl)
+		reserved_ram_resource(dev, index++, smmrrl, smmrrh - smmrrl);
+
+	/* All address space between bmbound and smmrrh is unusable. */
+	bmbound = RES_IN_KiB(iosf_bunit_read(BUNIT_BMBOUND) & ~((1 << 27) - 1));
+	mmio_resource(dev, index++, smmrrh, bmbound - smmrrh);
+
+	/* The BMBOUND_HI register matches register bits of 31:24 with address
+	 * bits of 35:28. Therefore, shift register to align properly. */
+	bmbound_hi = iosf_bunit_read(BUNIT_BMBOUND_HI) & ~((1 << 24) - 1);
+	bmbound_hi = RES_IN_KiB(bmbound_hi) << 4;
+	if (bmbound_hi > four_gig_kib)
+		ram_resource(dev, index++, four_gig_kib,
+		             bmbound_hi - four_gig_kib);
+}
+
+static void nc_read_resources(device_t dev)
+{
+	/* For some reason the graphics pci device (0, 2, 0) and the SoC
+	 * transaction router are coming up with the same device id. */
+	if (dev_find_slot(0, PCI_DEVFN(SOC_DEV, SOC_FUNC)) == dev)
+		return soc_trans_router_read_resources(dev);
+	else
+		/* Read standard PCI resources. */
+		pci_dev_read_resources(dev);
+
+}
+
+static struct device_operations nc_ops = {
+	.read_resources   = nc_read_resources,
+	.set_resources    = NULL,
+	.enable_resources = NULL,
+	.init             = NULL,
+	.enable           = NULL,
+	.scan_bus         = NULL,
+	.ops_pci          = &soc_pci_ops,
+};
+
+static const struct pci_driver nc_driver __pci_driver = {
+	.ops    = &nc_ops,
+	.vendor = PCI_VENDOR_ID_INTEL,
+	.device = SOC_DEVID,
+};
+