PCI: Add capability list parser to romstage
These are almost one-to-one copies from pci_device.c. However,
devicetree has not been enumerated yet and we have no console.
Change-Id: Ic80c781626521d03adde05bdb1916acce31290ea
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5196
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@google.com>
diff --git a/src/device/Makefile.inc b/src/device/Makefile.inc
index 1dbb510..ce412b78 100644
--- a/src/device/Makefile.inc
+++ b/src/device/Makefile.inc
@@ -13,7 +13,8 @@
ramstage-$(CONFIG_PCI) += pci_ops.c
ramstage-y += smbus_ops.c
-romstage-y+= device_romstage.c
+romstage-y += device_romstage.c
+romstage-$(CONFIG_PCI) += pci_early.c
subdirs-y += oprom
diff --git a/src/device/pci_early.c b/src/device/pci_early.c
new file mode 100644
index 0000000..c15a4d0
--- /dev/null
+++ b/src/device/pci_early.c
@@ -0,0 +1,68 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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 <arch/io.h>
+#include <device/pci.h>
+#include <device/pci_def.h>
+
+unsigned pci_find_next_capability(device_t dev, unsigned cap, unsigned last)
+{
+ unsigned pos = 0;
+ u16 status;
+ unsigned reps = 48;
+
+ status = pci_read_config16(dev, PCI_STATUS);
+ if (!(status & PCI_STATUS_CAP_LIST))
+ return 0;
+
+ u8 hdr_type = pci_read_config8(dev, PCI_HEADER_TYPE);
+ switch (hdr_type & 0x7f) {
+ case PCI_HEADER_TYPE_NORMAL:
+ case PCI_HEADER_TYPE_BRIDGE:
+ pos = PCI_CAPABILITY_LIST;
+ break;
+ case PCI_HEADER_TYPE_CARDBUS:
+ pos = PCI_CB_CAPABILITY_LIST;
+ break;
+ default:
+ return 0;
+ }
+
+ pos = pci_read_config8(dev, pos);
+ while (reps-- && (pos >= 0x40)) { /* Loop through the linked list. */
+ int this_cap;
+
+ pos &= ~3;
+ this_cap = pci_read_config8(dev, pos + PCI_CAP_LIST_ID);
+ if (this_cap == 0xff)
+ break;
+
+ if (!last && (this_cap == cap))
+ return pos;
+
+ if (last == pos)
+ last = 0;
+
+ pos = pci_read_config8(dev, pos + PCI_CAP_LIST_NEXT);
+ }
+ return 0;
+}
+
+unsigned pci_find_capability(device_t dev, unsigned cap)
+{
+ return pci_find_next_capability(dev, cap, 0);
+}
diff --git a/src/include/device/pci.h b/src/include/device/pci.h
index 7504cc7..29d988f 100644
--- a/src/include/device/pci.h
+++ b/src/include/device/pci.h
@@ -20,6 +20,7 @@
#include <stdint.h>
#include <stddef.h>
#include <arch/rules.h>
+#include <arch/io.h>
#include <device/pci_def.h>
#include <device/resource.h>
#include <device/device.h>
@@ -76,8 +77,6 @@
uint8_t pci_moving_config8(struct device *dev, unsigned reg);
uint16_t pci_moving_config16(struct device *dev, unsigned reg);
uint32_t pci_moving_config32(struct device *dev, unsigned reg);
-unsigned pci_find_next_capability(device_t dev, unsigned cap, unsigned last);
-unsigned pci_find_capability(device_t dev, unsigned cap);
struct resource *pci_get_resource(struct device *dev, unsigned long index);
void pci_dev_set_subsystem(device_t dev, unsigned vendor, unsigned device);
void pci_dev_init(struct device *dev);
@@ -101,6 +100,9 @@
#endif /* ! __SIMPLE_DEVICE__ */
+unsigned pci_find_next_capability(device_t dev, unsigned cap, unsigned last);
+unsigned pci_find_capability(device_t dev, unsigned cap);
+
#endif /* CONFIG_PCI */
#endif /* PCI_H */