dm: pci: Add a uclass for PCI

Add a uclass for PCI controllers and a generic one for PCI devices. Adjust
the 'pci' command and the existing PCI support to work with this new uclass.
Keep most of the compatibility code in a separate file so that it can be
removed one day.

TODO: Add more header file comments to the new parts of pci.h

Signed-off-by: Simon Glass <sjg@chromium.org>

5 files changed, 714 insertions, 4 deletions

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index e69de29..8b7e2ee 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -0,0 +1,12 @@
+menu "PCI"
+
+config DM_PCI
+	bool "Enable driver mode for PCI"
+	depends on DM
+	help
+	  Use driver model for PCI. Driver model is the new method for
+	  orgnising devices in U-Boot. For PCI, driver model keeps track of
+	  available PCI devices, allows scanning of PCI buses and provides
+	  device configuration support.
+
+endmenu
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 856a5f5..db82786 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -5,8 +5,14 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
+ifneq ($(CONFIG_DM_PCI),)
+obj-$(CONFIG_PCI) += pci-uclass.o pci_compat.o
+else
+obj-$(CONFIG_PCI) += pci.o
+endif
+obj-$(CONFIG_PCI) += pci_common.o pci_auto.o pci_rom.o
+
 obj-$(CONFIG_FSL_PCI_INIT) += fsl_pci_init.o
-obj-$(CONFIG_PCI) += pci.o  pci_common.o pci_auto.o pci_rom.o
 obj-$(CONFIG_PCI_INDIRECT_BRIDGE) += pci_indirect.o
 obj-$(CONFIG_PCI_GT64120) += pci_gt64120.o
 obj-$(CONFIG_PCI_MSC01) += pci_msc01.o
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
new file mode 100644
index 0000000..d48d865
--- /dev/null
+++ b/drivers/pci/pci-uclass.c
@@ -0,0 +1,639 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <inttypes.h>
+#include <pci.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+#include <dm/device-internal.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct pci_controller *pci_bus_to_hose(int busnum)
+{
+	struct udevice *bus;
+	int ret;
+
+	ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, &bus);
+	if (ret) {
+		debug("%s: Cannot get bus %d: ret=%d\n", __func__, busnum, ret);
+		return NULL;
+	}
+	return dev_get_uclass_priv(bus);
+}
+
+/**
+ * pci_get_bus_max() - returns the bus number of the last active bus
+ *
+ * @return last bus number, or -1 if no active buses
+ */
+static int pci_get_bus_max(void)
+{
+	struct udevice *bus;
+	struct uclass *uc;
+	int ret = -1;
+
+	ret = uclass_get(UCLASS_PCI, &uc);
+	uclass_foreach_dev(bus, uc) {
+		if (bus->seq > ret)
+			ret = bus->seq;
+	}
+
+	debug("%s: ret=%d\n", __func__, ret);
+
+	return ret;
+}
+
+int pci_last_busno(void)
+{
+	struct pci_controller *hose;
+	struct udevice *bus;
+	struct uclass *uc;
+	int ret;
+
+	debug("pci_last_busno\n");
+	ret = uclass_get(UCLASS_PCI, &uc);
+	if (ret || list_empty(&uc->dev_head))
+		return -1;
+
+	/* Probe the last bus */
+	bus = list_entry(uc->dev_head.prev, struct udevice, uclass_node);
+	debug("bus = %p, %s\n", bus, bus->name);
+	assert(bus);
+	ret = device_probe(bus);
+	if (ret)
+		return ret;
+
+	/* If that bus has bridges, we may have new buses now. Get the last */
+	bus = list_entry(uc->dev_head.prev, struct udevice, uclass_node);
+	hose = dev_get_uclass_priv(bus);
+	debug("bus = %s, hose = %p\n", bus->name, hose);
+
+	return hose->last_busno;
+}
+
+int pci_get_ff(enum pci_size_t size)
+{
+	switch (size) {
+	case PCI_SIZE_8:
+		return 0xff;
+	case PCI_SIZE_16:
+		return 0xffff;
+	default:
+		return 0xffffffff;
+	}
+}
+
+int pci_bus_find_devfn(struct udevice *bus, pci_dev_t find_devfn,
+		       struct udevice **devp)
+{
+	struct udevice *dev;
+
+	for (device_find_first_child(bus, &dev);
+	     dev;
+	     device_find_next_child(&dev)) {
+		struct pci_child_platdata *pplat;
+
+		pplat = dev_get_parent_platdata(dev);
+		if (pplat && pplat->devfn == find_devfn) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
+int pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
+{
+	struct udevice *bus;
+	int ret;
+
+	ret = uclass_get_device_by_seq(UCLASS_PCI, PCI_BUS(bdf), &bus);
+	if (ret)
+		return ret;
+	return pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), devp);
+}
+
+static int pci_device_matches_ids(struct udevice *dev,
+				  struct pci_device_id *ids)
+{
+	struct pci_child_platdata *pplat;
+	int i;
+
+	pplat = dev_get_parent_platdata(dev);
+	if (!pplat)
+		return -EINVAL;
+	for (i = 0; ids[i].vendor != 0; i++) {
+		if (pplat->vendor == ids[i].vendor &&
+		    pplat->device == ids[i].device)
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
+			 int *indexp, struct udevice **devp)
+{
+	struct udevice *dev;
+
+	/* Scan all devices on this bus */
+	for (device_find_first_child(bus, &dev);
+	     dev;
+	     device_find_next_child(&dev)) {
+		if (pci_device_matches_ids(dev, ids) >= 0) {
+			if ((*indexp)-- <= 0) {
+				*devp = dev;
+				return 0;
+			}
+		}
+	}
+
+	return -ENODEV;
+}
+
+int pci_find_device_id(struct pci_device_id *ids, int index,
+		       struct udevice **devp)
+{
+	struct udevice *bus;
+
+	/* Scan all known buses */
+	for (uclass_first_device(UCLASS_PCI, &bus);
+	     bus;
+	     uclass_next_device(&bus)) {
+		if (!pci_bus_find_devices(bus, ids, &index, devp))
+			return 0;
+	}
+	*devp = NULL;
+
+	return -ENODEV;
+}
+
+int pci_bus_write_config(struct udevice *bus, pci_dev_t bdf, int offset,
+			 unsigned long value, enum pci_size_t size)
+{
+	struct dm_pci_ops *ops;
+
+	ops = pci_get_ops(bus);
+	if (!ops->write_config)
+		return -ENOSYS;
+	return ops->write_config(bus, bdf, offset, value, size);
+}
+
+int pci_write_config(pci_dev_t bdf, int offset, unsigned long value,
+		     enum pci_size_t size)
+{
+	struct udevice *bus;
+	int ret;
+
+	ret = uclass_get_device_by_seq(UCLASS_PCI, PCI_BUS(bdf), &bus);
+	if (ret)
+		return ret;
+
+	return pci_bus_write_config(bus, PCI_MASK_BUS(bdf), offset, value,
+				    size);
+}
+
+int pci_write_config32(pci_dev_t bdf, int offset, u32 value)
+{
+	return pci_write_config(bdf, offset, value, PCI_SIZE_32);
+}
+
+int pci_write_config16(pci_dev_t bdf, int offset, u16 value)
+{
+	return pci_write_config(bdf, offset, value, PCI_SIZE_16);
+}
+
+int pci_write_config8(pci_dev_t bdf, int offset, u8 value)
+{
+	return pci_write_config(bdf, offset, value, PCI_SIZE_8);
+}
+
+int pci_bus_read_config(struct udevice *bus, pci_dev_t bdf, int offset,
+			unsigned long *valuep, enum pci_size_t size)
+{
+	struct dm_pci_ops *ops;
+
+	ops = pci_get_ops(bus);
+	if (!ops->read_config)
+		return -ENOSYS;
+	return ops->read_config(bus, bdf, offset, valuep, size);
+}
+
+int pci_read_config(pci_dev_t bdf, int offset, unsigned long *valuep,
+		    enum pci_size_t size)
+{
+	struct udevice *bus;
+	int ret;
+
+	ret = uclass_get_device_by_seq(UCLASS_PCI, PCI_BUS(bdf), &bus);
+	if (ret)
+		return ret;
+
+	return pci_bus_read_config(bus, PCI_MASK_BUS(bdf), offset, valuep,
+				   size);
+}
+
+int pci_read_config32(pci_dev_t bdf, int offset, u32 *valuep)
+{
+	unsigned long value;
+	int ret;
+
+	ret = pci_read_config(bdf, offset, &value, PCI_SIZE_32);
+	if (ret)
+		return ret;
+	*valuep = value;
+
+	return 0;
+}
+
+int pci_read_config16(pci_dev_t bdf, int offset, u16 *valuep)
+{
+	unsigned long value;
+	int ret;
+
+	ret = pci_read_config(bdf, offset, &value, PCI_SIZE_16);
+	if (ret)
+		return ret;
+	*valuep = value;
+
+	return 0;
+}
+
+int pci_read_config8(pci_dev_t bdf, int offset, u8 *valuep)
+{
+	unsigned long value;
+	int ret;
+
+	ret = pci_read_config(bdf, offset, &value, PCI_SIZE_8);
+	if (ret)
+		return ret;
+	*valuep = value;
+
+	return 0;
+}
+
+int pci_auto_config_devices(struct udevice *bus)
+{
+	struct pci_controller *hose = bus->uclass_priv;
+	unsigned int sub_bus;
+	struct udevice *dev;
+	int ret;
+
+	sub_bus = bus->seq;
+	debug("%s: start\n", __func__);
+	pciauto_config_init(hose);
+	for (ret = device_find_first_child(bus, &dev);
+	     !ret && dev;
+	     ret = device_find_next_child(&dev)) {
+		struct pci_child_platdata *pplat;
+
+		pplat = dev_get_parent_platdata(dev);
+		unsigned int max_bus;
+		pci_dev_t bdf;
+
+		bdf = PCI_ADD_BUS(bus->seq, pplat->devfn);
+		debug("%s: device %s\n", __func__, dev->name);
+		max_bus = pciauto_config_device(hose, bdf);
+		sub_bus = max(sub_bus, max_bus);
+	}
+	debug("%s: done\n", __func__);
+
+	return sub_bus;
+}
+
+int dm_pci_hose_probe_bus(struct pci_controller *hose, pci_dev_t bdf)
+{
+	struct udevice *parent, *bus;
+	int sub_bus;
+	int ret;
+
+	debug("%s\n", __func__);
+	parent = hose->bus;
+
+	/* Find the bus within the parent */
+	ret = pci_bus_find_devfn(parent, bdf, &bus);
+	if (ret) {
+		debug("%s: Cannot find device %x on bus %s: %d\n", __func__,
+		      bdf, parent->name, ret);
+		return ret;
+	}
+
+	sub_bus = pci_get_bus_max() + 1;
+	debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name);
+	pciauto_prescan_setup_bridge(hose, bdf, bus->seq);
+
+	ret = device_probe(bus);
+	if (ret) {
+		debug("%s: Cannot probe bus bus %s: %d\n", __func__, bus->name,
+		      ret);
+		return ret;
+	}
+	if (sub_bus != bus->seq) {
+		printf("%s: Internal error, bus '%s' got seq %d, expected %d\n",
+		       __func__, bus->name, bus->seq, sub_bus);
+		return -EPIPE;
+	}
+	sub_bus = pci_get_bus_max();
+	pciauto_postscan_setup_bridge(hose, bdf, sub_bus);
+
+	return sub_bus;
+}
+
+int pci_bind_bus_devices(struct udevice *bus)
+{
+	ulong vendor, device;
+	ulong header_type;
+	pci_dev_t devfn, end;
+	bool found_multi;
+	int ret;
+
+	found_multi = false;
+	end = PCI_DEVFN(PCI_MAX_PCI_DEVICES - 1, PCI_MAX_PCI_FUNCTIONS - 1);
+	for (devfn = PCI_DEVFN(0, 0); devfn < end; devfn += PCI_DEVFN(0, 1)) {
+		struct pci_child_platdata *pplat;
+		struct udevice *dev;
+		ulong class;
+
+		if (PCI_FUNC(devfn) && !found_multi)
+			continue;
+		/* Check only the first access, we don't expect problems */
+		ret = pci_bus_read_config(bus, devfn, PCI_HEADER_TYPE,
+					  &header_type, PCI_SIZE_8);
+		if (ret)
+			goto error;
+		pci_bus_read_config(bus, devfn, PCI_VENDOR_ID, &vendor,
+				    PCI_SIZE_16);
+		if (vendor == 0xffff || vendor == 0x0000)
+			continue;
+
+		if (!PCI_FUNC(devfn))
+			found_multi = header_type & 0x80;
+
+		debug("%s: bus %d/%s: found device %x, function %d\n", __func__,
+		      bus->seq, bus->name, PCI_DEV(devfn), PCI_FUNC(devfn));
+		pci_bus_read_config(bus, devfn, PCI_DEVICE_ID, &device,
+				    PCI_SIZE_16);
+		pci_bus_read_config(bus, devfn, PCI_CLASS_DEVICE, &class,
+				    PCI_SIZE_16);
+
+		/* Find this device in the device tree */
+		ret = pci_bus_find_devfn(bus, devfn, &dev);
+
+		/* If nothing in the device tree, bind a generic device */
+		if (ret == -ENODEV) {
+			char name[30], *str;
+			const char *drv;
+
+			sprintf(name, "pci_%x:%x.%x", bus->seq,
+				PCI_DEV(devfn), PCI_FUNC(devfn));
+			str = strdup(name);
+			if (!str)
+				return -ENOMEM;
+			drv = class == PCI_CLASS_BRIDGE_PCI ?
+				"pci_bridge_drv" : "pci_generic_drv";
+			ret = device_bind_driver(bus, drv, str, &dev);
+		}
+		if (ret)
+			return ret;
+
+		/* Update the platform data */
+		pplat = dev_get_parent_platdata(dev);
+		pplat->devfn = devfn;
+		pplat->vendor = vendor;
+		pplat->device = device;
+		pplat->class = class;
+	}
+
+	return 0;
+error:
+	printf("Cannot read bus configuration: %d\n", ret);
+
+	return ret;
+}
+
+static int pci_uclass_post_bind(struct udevice *bus)
+{
+	/*
+	 * Scan the device tree for devices. This does not probe the PCI bus,
+	 * as this is not permitted while binding. It just finds devices
+	 * mentioned in the device tree.
+	 *
+	 * Before relocation, only bind devices marked for pre-relocation
+	 * use.
+	 */
+	return dm_scan_fdt_node(bus, gd->fdt_blob, bus->of_offset,
+				gd->flags & GD_FLG_RELOC ? false : true);
+}
+
+static int decode_regions(struct pci_controller *hose, const void *blob,
+			  int parent_node, int node)
+{
+	int pci_addr_cells, addr_cells, size_cells;
+	int cells_per_record;
+	const u32 *prop;
+	int len;
+	int i;
+
+	prop = fdt_getprop(blob, node, "ranges", &len);
+	if (!prop)
+		return -EINVAL;
+	pci_addr_cells = fdt_address_cells(blob, node);
+	addr_cells = fdt_address_cells(blob, parent_node);
+	size_cells = fdt_size_cells(blob, node);
+
+	/* PCI addresses are always 3-cells */
+	len /= sizeof(u32);
+	cells_per_record = pci_addr_cells + addr_cells + size_cells;
+	hose->region_count = 0;
+	debug("%s: len=%d, cells_per_record=%d\n", __func__, len,
+	      cells_per_record);
+	for (i = 0; i < MAX_PCI_REGIONS; i++, len -= cells_per_record) {
+		u64 pci_addr, addr, size;
+		int space_code;
+		u32 flags;
+		int type;
+
+		if (len < cells_per_record)
+			break;
+		flags = fdt32_to_cpu(prop[0]);
+		space_code = (flags >> 24) & 3;
+		pci_addr = fdtdec_get_number(prop + 1, 2);
+		prop += pci_addr_cells;
+		addr = fdtdec_get_number(prop, addr_cells);
+		prop += addr_cells;
+		size = fdtdec_get_number(prop, size_cells);
+		prop += size_cells;
+		debug("%s: region %d, pci_addr=%" PRIx64 ", addr=%" PRIx64
+		      ", size=%" PRIx64 ", space_code=%d\n", __func__,
+		      hose->region_count, pci_addr, addr, size, space_code);
+		if (space_code & 2) {
+			type = flags & (1U << 30) ? PCI_REGION_PREFETCH :
+					PCI_REGION_MEM;
+		} else if (space_code & 1) {
+			type = PCI_REGION_IO;
+		} else {
+			continue;
+		}
+		debug(" - type=%d\n", type);
+		pci_set_region(hose->regions + hose->region_count++, pci_addr,
+			       addr, size, type);
+	}
+
+	/* Add a region for our local memory */
+	pci_set_region(hose->regions + hose->region_count++, 0, 0,
+		       gd->ram_size, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+	return 0;
+}
+
+static int pci_uclass_pre_probe(struct udevice *bus)
+{
+	struct pci_controller *hose;
+	int ret;
+
+	debug("%s, bus=%d/%s, parent=%s\n", __func__, bus->seq, bus->name,
+	      bus->parent->name);
+	hose = bus->uclass_priv;
+
+	/* For bridges, use the top-level PCI controller */
+	if (device_get_uclass_id(bus->parent) == UCLASS_ROOT) {
+		hose->ctlr = bus;
+		ret = decode_regions(hose, gd->fdt_blob, bus->parent->of_offset,
+				bus->of_offset);
+		if (ret) {
+			debug("%s: Cannot decode regions\n", __func__);
+			return ret;
+		}
+	} else {
+		struct pci_controller *parent_hose;
+
+		parent_hose = dev_get_uclass_priv(bus->parent);
+		hose->ctlr = parent_hose->bus;
+	}
+	hose->bus = bus;
+	hose->first_busno = bus->seq;
+	hose->last_busno = bus->seq;
+
+	return 0;
+}
+
+static int pci_uclass_post_probe(struct udevice *bus)
+{
+	int ret;
+
+	/* Don't scan buses before relocation */
+	if (!(gd->flags & GD_FLG_RELOC))
+		return 0;
+
+	debug("%s: probing bus %d\n", __func__, bus->seq);
+	ret = pci_bind_bus_devices(bus);
+	if (ret)
+		return ret;
+
+#ifdef CONFIG_PCI_PNP
+	ret = pci_auto_config_devices(bus);
+#endif
+
+	return ret < 0 ? ret : 0;
+}
+
+static int pci_uclass_child_post_bind(struct udevice *dev)
+{
+	struct pci_child_platdata *pplat;
+	struct fdt_pci_addr addr;
+	int ret;
+
+	if (dev->of_offset == -1)
+		return 0;
+
+	/*
+	 * We could read vendor, device, class if available. But for now we
+	 * just check the address.
+	 */
+	pplat = dev_get_parent_platdata(dev);
+	ret = fdtdec_get_pci_addr(gd->fdt_blob, dev->of_offset,
+				  FDT_PCI_SPACE_CONFIG, "reg", &addr);
+
+	if (ret) {
+		if (ret != -ENOENT)
+			return -EINVAL;
+	} else {
+		/* extract the bdf from fdt_pci_addr */
+		pplat->devfn = addr.phys_hi & 0xffff00;
+	}
+
+	return 0;
+}
+
+int pci_bridge_read_config(struct udevice *bus, pci_dev_t devfn, uint offset,
+			   ulong *valuep, enum pci_size_t size)
+{
+	struct pci_controller *hose = bus->uclass_priv;
+	pci_dev_t bdf = PCI_ADD_BUS(bus->seq, devfn);
+
+	return pci_bus_read_config(hose->ctlr, bdf, offset, valuep, size);
+}
+
+int pci_bridge_write_config(struct udevice *bus, pci_dev_t devfn, uint offset,
+			    ulong value, enum pci_size_t size)
+{
+	struct pci_controller *hose = bus->uclass_priv;
+	pci_dev_t bdf = PCI_ADD_BUS(bus->seq, devfn);
+
+	return pci_bus_write_config(hose->ctlr, bdf, offset, value, size);
+}
+
+UCLASS_DRIVER(pci) = {
+	.id		= UCLASS_PCI,
+	.name		= "pci",
+	.post_bind	= pci_uclass_post_bind,
+	.pre_probe	= pci_uclass_pre_probe,
+	.post_probe	= pci_uclass_post_probe,
+	.child_post_bind = pci_uclass_child_post_bind,
+	.per_device_auto_alloc_size = sizeof(struct pci_controller),
+	.per_child_platdata_auto_alloc_size =
+			sizeof(struct pci_child_platdata),
+};
+
+static const struct dm_pci_ops pci_bridge_ops = {
+	.read_config	= pci_bridge_read_config,
+	.write_config	= pci_bridge_write_config,
+};
+
+static const struct udevice_id pci_bridge_ids[] = {
+	{ .compatible = "pci-bridge" },
+	{ }
+};
+
+U_BOOT_DRIVER(pci_bridge_drv) = {
+	.name		= "pci_bridge_drv",
+	.id		= UCLASS_PCI,
+	.of_match	= pci_bridge_ids,
+	.ops		= &pci_bridge_ops,
+};
+
+UCLASS_DRIVER(pci_generic) = {
+	.id		= UCLASS_PCI_GENERIC,
+	.name		= "pci_generic",
+};
+
+static const struct udevice_id pci_generic_ids[] = {
+	{ .compatible = "pci-generic" },
+	{ }
+};
+
+U_BOOT_DRIVER(pci_generic_drv) = {
+	.name		= "pci_generic_drv",
+	.id		= UCLASS_PCI_GENERIC,
+	.of_match	= pci_generic_ids,
+};
diff --git a/drivers/pci/pci_auto.c b/drivers/pci/pci_auto.c
index 378efbf..e8da977 100644
--- a/drivers/pci/pci_auto.c
+++ b/drivers/pci/pci_auto.c
@@ -432,13 +432,20 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 
 	switch (class) {
 	case PCI_CLASS_BRIDGE_PCI:
-		hose->current_busno++;
+		DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n",
+		       PCI_DEV(dev));
+
 		pciauto_setup_device(hose, dev, 2, hose->pci_mem,
 			hose->pci_prefetch, hose->pci_io);
 
-		DEBUGF("PCI Autoconfig: Found P2P bridge, device %d\n", PCI_DEV(dev));
-
+#ifdef CONFIG_DM_PCI
+		n = dm_pci_hose_probe_bus(hose, dev);
+		if (n < 0)
+			return n;
+		sub_bus = (unsigned int)n;
+#else
 		/* Passing in current_busno allows for sibling P2P bridges */
+		hose->current_busno++;
 		pciauto_prescan_setup_bridge(hose, dev, hose->current_busno);
 		/*
 		 * need to figure out if this is a subordinate bridge on the bus
@@ -451,6 +458,7 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 		pciauto_postscan_setup_bridge(hose, dev, sub_bus);
 
 		sub_bus = hose->current_busno;
+#endif
 		break;
 
 	case PCI_CLASS_STORAGE_IDE:
@@ -475,7 +483,9 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 		DEBUGF("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
 			PCI_DEV(dev));
 
+#ifndef CONFIG_DM_PCI
 		hose->current_busno++;
+#endif
 		break;
 
 #if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE)
diff --git a/drivers/pci/pci_compat.c b/drivers/pci/pci_compat.c
new file mode 100644
index 0000000..d6938c1
--- /dev/null
+++ b/drivers/pci/pci_compat.c
@@ -0,0 +1,43 @@
+/*
+ * Compatibility functions for pre-driver-model code
+ *
+ * Copyright (C) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#define DEBUG
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <malloc.h>
+#include <pci.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+
+#define PCI_HOSE_OP(rw, name, size, type)				\
+int pci_hose_##rw##_config_##name(struct pci_controller *hose,		\
+				  pci_dev_t dev,			\
+				  int offset, type value)		\
+{									\
+	return pci_##rw##_config##size(dev, offset, value);		\
+}
+
+PCI_HOSE_OP(read, byte, 8, u8 *)
+PCI_HOSE_OP(read, word, 16, u16 *)
+PCI_HOSE_OP(read, dword, 32, u32 *)
+PCI_HOSE_OP(write, byte, 8, u8)
+PCI_HOSE_OP(write, word, 16, u16)
+PCI_HOSE_OP(write, dword, 32, u32)
+
+pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
+{
+	struct pci_child_platdata *pplat;
+	struct udevice *bus, *dev;
+
+	if (pci_find_device_id(ids, index, &dev))
+		return -1;
+	bus = dev->parent;
+	pplat = dev_get_parent_platdata(dev);
+
+	return PCI_ADD_BUS(bus->seq, pplat->devfn);
+}