dm: pci: Use driver model PCI API in auto-config

At present we are using legacy functions even in the auto-configuration code
used by driver model. Add a new pci_auto.c version which uses the correct
API.

Create a new pci_internal.h header to hold functions that are used within
the PCI subsystem, but are not exported to other drivers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

5 files changed, 444 insertions, 62 deletions

diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 6b761b4..62232fc 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -6,15 +6,15 @@
 #
 
 ifneq ($(CONFIG_DM_PCI),)
-obj-$(CONFIG_PCI) += pci-uclass.o
+obj-$(CONFIG_PCI) += pci-uclass.o pci_auto.o
 obj-$(CONFIG_DM_PCI_COMPAT) += pci_compat.o
 obj-$(CONFIG_PCI_SANDBOX) += pci_sandbox.o
 obj-$(CONFIG_SANDBOX) += pci-emul-uclass.o
 obj-$(CONFIG_X86) += pci_x86.o
 else
-obj-$(CONFIG_PCI) += pci.o
+obj-$(CONFIG_PCI) += pci.o pci_auto_old.o
 endif
-obj-$(CONFIG_PCI) +=  pci_auto_common.o pci_auto_old.o pci_common.o pci_rom.o
+obj-$(CONFIG_PCI) += pci_auto_common.o pci_common.o pci_rom.o
 
 obj-$(CONFIG_FSL_PCI_INIT) += fsl_pci_init.o
 obj-$(CONFIG_PCI_INDIRECT_BRIDGE) += pci_indirect.o
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index 2828055..792d9cb 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -17,6 +17,7 @@
 #if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
 #include <asm/fsp/fsp_support.h>
 #endif
+#include "pci_internal.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -404,7 +405,7 @@ int pci_auto_config_devices(struct udevice *bus)
 		int ret;
 
 		debug("%s: device %s\n", __func__, dev->name);
-		ret = pciauto_config_device(hose, dm_pci_get_bdf(dev));
+		ret = dm_pciauto_config_device(dev);
 		if (ret < 0)
 			return ret;
 		max_bus = ret;
@@ -419,26 +420,16 @@ int pci_auto_config_devices(struct udevice *bus)
 	return sub_bus;
 }
 
-int dm_pci_hose_probe_bus(struct pci_controller *hose, pci_dev_t bdf)
+int dm_pci_hose_probe_bus(struct udevice *bus)
 {
-	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, PCI_MASK_BUS(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, sub_bus);
+	dm_pciauto_prescan_setup_bridge(bus, sub_bus);
 
 	ret = device_probe(bus);
 	if (ret) {
@@ -452,7 +443,7 @@ int dm_pci_hose_probe_bus(struct pci_controller *hose, pci_dev_t bdf)
 		return -EPIPE;
 	}
 	sub_bus = pci_get_bus_max();
-	pciauto_postscan_setup_bridge(hose, bdf, sub_bus);
+	dm_pciauto_postscan_setup_bridge(bus, sub_bus);
 
 	return sub_bus;
 }
diff --git a/drivers/pci/pci_auto.c b/drivers/pci/pci_auto.c
new file mode 100644
index 0000000..842eafc
--- /dev/null
+++ b/drivers/pci/pci_auto.c
@@ -0,0 +1,386 @@
+/*
+ * PCI autoconfiguration library
+ *
+ * Author: Matt Porter <mporter@mvista.com>
+ *
+ * Copyright 2000 MontaVista Software Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <pci.h>
+
+/* the user can define CONFIG_SYS_PCI_CACHE_LINE_SIZE to avoid problems */
+#ifndef CONFIG_SYS_PCI_CACHE_LINE_SIZE
+#define CONFIG_SYS_PCI_CACHE_LINE_SIZE	8
+#endif
+
+void dm_pciauto_setup_device(struct udevice *dev, int bars_num,
+			     struct pci_region *mem,
+			     struct pci_region *prefetch, struct pci_region *io,
+			     bool enum_only)
+{
+	u32 bar_response;
+	pci_size_t bar_size;
+	u16 cmdstat = 0;
+	int bar, bar_nr = 0;
+	u8 header_type;
+	int rom_addr;
+	pci_addr_t bar_value;
+	struct pci_region *bar_res;
+	int found_mem64 = 0;
+	u16 class;
+
+	dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat);
+	cmdstat = (cmdstat & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) |
+			PCI_COMMAND_MASTER;
+
+	for (bar = PCI_BASE_ADDRESS_0;
+	     bar < PCI_BASE_ADDRESS_0 + (bars_num * 4); bar += 4) {
+		/* Tickle the BAR and get the response */
+		if (!enum_only)
+			dm_pci_write_config32(dev, bar, 0xffffffff);
+		dm_pci_read_config32(dev, bar, &bar_response);
+
+		/* If BAR is not implemented go to the next BAR */
+		if (!bar_response)
+			continue;
+
+		found_mem64 = 0;
+
+		/* Check the BAR type and set our address mask */
+		if (bar_response & PCI_BASE_ADDRESS_SPACE) {
+			bar_size = ((~(bar_response & PCI_BASE_ADDRESS_IO_MASK))
+				   & 0xffff) + 1;
+			if (!enum_only)
+				bar_res = io;
+
+			debug("PCI Autoconfig: BAR %d, I/O, size=0x%llx, ",
+			      bar_nr, (unsigned long long)bar_size);
+		} else {
+			if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
+			     PCI_BASE_ADDRESS_MEM_TYPE_64) {
+				u32 bar_response_upper;
+				u64 bar64;
+
+				if (!enum_only) {
+					dm_pci_write_config32(dev, bar + 4,
+							      0xffffffff);
+				}
+				dm_pci_read_config32(dev, bar + 4,
+						     &bar_response_upper);
+
+				bar64 = ((u64)bar_response_upper << 32) |
+						bar_response;
+
+				bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK)
+						+ 1;
+				if (!enum_only)
+					found_mem64 = 1;
+			} else {
+				bar_size = (u32)(~(bar_response &
+						PCI_BASE_ADDRESS_MEM_MASK) + 1);
+			}
+			if (!enum_only) {
+				if (prefetch && (bar_response &
+					    PCI_BASE_ADDRESS_MEM_PREFETCH)) {
+					bar_res = prefetch;
+				} else {
+					bar_res = mem;
+				}
+			}
+
+			debug("PCI Autoconfig: BAR %d, %s, size=0x%llx, ",
+			      bar_nr, bar_res == prefetch ? "Prf" : "Mem",
+			      (unsigned long long)bar_size);
+		}
+
+		if (!enum_only && pciauto_region_allocate(bar_res, bar_size,
+							  &bar_value) == 0) {
+			/* Write it out and update our limit */
+			dm_pci_write_config32(dev, bar, (u32)bar_value);
+
+			if (found_mem64) {
+				bar += 4;
+#ifdef CONFIG_SYS_PCI_64BIT
+				dm_pci_write_config32(dev, bar,
+						      (u32)(bar_value >> 32));
+#else
+				/*
+				 * If we are a 64-bit decoder then increment to
+				 * the upper 32 bits of the bar and force it to
+				 * locate in the lower 4GB of memory.
+				 */
+				dm_pci_write_config32(dev, bar, 0x00000000);
+#endif
+			}
+		}
+
+		cmdstat |= (bar_response & PCI_BASE_ADDRESS_SPACE) ?
+			PCI_COMMAND_IO : PCI_COMMAND_MEMORY;
+
+		debug("\n");
+
+		bar_nr++;
+	}
+
+	if (!enum_only) {
+		/* Configure the expansion ROM address */
+		dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type);
+		header_type &= 0x7f;
+		if (header_type != PCI_HEADER_TYPE_CARDBUS) {
+			rom_addr = (header_type == PCI_HEADER_TYPE_NORMAL) ?
+				PCI_ROM_ADDRESS : PCI_ROM_ADDRESS1;
+			dm_pci_write_config32(dev, rom_addr, 0xfffffffe);
+			dm_pci_read_config32(dev, rom_addr, &bar_response);
+			if (bar_response) {
+				bar_size = -(bar_response & ~1);
+				debug("PCI Autoconfig: ROM, size=%#x, ",
+				      (unsigned int)bar_size);
+				if (pciauto_region_allocate(mem, bar_size,
+							    &bar_value) == 0) {
+					dm_pci_write_config32(dev, rom_addr,
+							      bar_value);
+				}
+				cmdstat |= PCI_COMMAND_MEMORY;
+				debug("\n");
+			}
+		}
+	}
+
+	/* PCI_COMMAND_IO must be set for VGA device */
+	dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class);
+	if (class == PCI_CLASS_DISPLAY_VGA)
+		cmdstat |= PCI_COMMAND_IO;
+
+	dm_pci_write_config16(dev, PCI_COMMAND, cmdstat);
+	dm_pci_write_config8(dev, PCI_CACHE_LINE_SIZE,
+			     CONFIG_SYS_PCI_CACHE_LINE_SIZE);
+	dm_pci_write_config8(dev, PCI_LATENCY_TIMER, 0x80);
+}
+
+void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus)
+{
+	struct pci_region *pci_mem;
+	struct pci_region *pci_prefetch;
+	struct pci_region *pci_io;
+	u16 cmdstat, prefechable_64;
+	/* The root controller has the region information */
+	struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
+
+	pci_mem = ctlr_hose->pci_mem;
+	pci_prefetch = ctlr_hose->pci_prefetch;
+	pci_io = ctlr_hose->pci_io;
+
+	dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat);
+	dm_pci_read_config16(dev, PCI_PREF_MEMORY_BASE, &prefechable_64);
+	prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
+
+	/* Configure bus number registers */
+	dm_pci_write_config8(dev, PCI_PRIMARY_BUS,
+			     PCI_BUS(dm_pci_get_bdf(dev)));
+	dm_pci_write_config8(dev, PCI_SECONDARY_BUS, sub_bus);
+	dm_pci_write_config8(dev, PCI_SUBORDINATE_BUS, 0xff);
+
+	if (pci_mem) {
+		/* Round memory allocator to 1MB boundary */
+		pciauto_region_align(pci_mem, 0x100000);
+
+		/*
+		 * Set up memory and I/O filter limits, assume 32-bit
+		 * I/O space
+		 */
+		dm_pci_write_config16(dev, PCI_MEMORY_BASE,
+				      (pci_mem->bus_lower & 0xfff00000) >> 16);
+
+		cmdstat |= PCI_COMMAND_MEMORY;
+	}
+
+	if (pci_prefetch) {
+		/* Round memory allocator to 1MB boundary */
+		pciauto_region_align(pci_prefetch, 0x100000);
+
+		/*
+		 * Set up memory and I/O filter limits, assume 32-bit
+		 * I/O space
+		 */
+		dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE,
+				(pci_prefetch->bus_lower & 0xfff00000) >> 16);
+		if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
+#ifdef CONFIG_SYS_PCI_64BIT
+			dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32,
+					      pci_prefetch->bus_lower >> 32);
+#else
+			dm_pci_write_config32(dev, PCI_PREF_BASE_UPPER32, 0x0);
+#endif
+
+		cmdstat |= PCI_COMMAND_MEMORY;
+	} else {
+		/* We don't support prefetchable memory for now, so disable */
+		dm_pci_write_config16(dev, PCI_PREF_MEMORY_BASE, 0x1000);
+		dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT, 0x0);
+		if (prefechable_64 == PCI_PREF_RANGE_TYPE_64) {
+			dm_pci_write_config16(dev, PCI_PREF_BASE_UPPER32, 0x0);
+			dm_pci_write_config16(dev, PCI_PREF_LIMIT_UPPER32, 0x0);
+		}
+	}
+
+	if (pci_io) {
+		/* Round I/O allocator to 4KB boundary */
+		pciauto_region_align(pci_io, 0x1000);
+
+		dm_pci_write_config8(dev, PCI_IO_BASE,
+				     (pci_io->bus_lower & 0x0000f000) >> 8);
+		dm_pci_write_config16(dev, PCI_IO_BASE_UPPER16,
+				      (pci_io->bus_lower & 0xffff0000) >> 16);
+
+		cmdstat |= PCI_COMMAND_IO;
+	}
+
+	/* Enable memory and I/O accesses, enable bus master */
+	dm_pci_write_config16(dev, PCI_COMMAND, cmdstat | PCI_COMMAND_MASTER);
+}
+
+void dm_pciauto_postscan_setup_bridge(struct udevice *dev, int sub_bus)
+{
+	struct pci_region *pci_mem;
+	struct pci_region *pci_prefetch;
+	struct pci_region *pci_io;
+
+	/* The root controller has the region information */
+	struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
+
+	pci_mem = ctlr_hose->pci_mem;
+	pci_prefetch = ctlr_hose->pci_prefetch;
+	pci_io = ctlr_hose->pci_io;
+
+	/* Configure bus number registers */
+	dm_pci_write_config8(dev, PCI_SUBORDINATE_BUS, sub_bus);
+
+	if (pci_mem) {
+		/* Round memory allocator to 1MB boundary */
+		pciauto_region_align(pci_mem, 0x100000);
+
+		dm_pci_write_config16(dev, PCI_MEMORY_LIMIT,
+				      (pci_mem->bus_lower - 1) >> 16);
+	}
+
+	if (pci_prefetch) {
+		u16 prefechable_64;
+
+		dm_pci_read_config16(dev, PCI_PREF_MEMORY_LIMIT,
+				     &prefechable_64);
+		prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
+
+		/* Round memory allocator to 1MB boundary */
+		pciauto_region_align(pci_prefetch, 0x100000);
+
+		dm_pci_write_config16(dev, PCI_PREF_MEMORY_LIMIT,
+				      (pci_prefetch->bus_lower - 1) >> 16);
+		if (prefechable_64 == PCI_PREF_RANGE_TYPE_64)
+#ifdef CONFIG_SYS_PCI_64BIT
+			dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32,
+					(pci_prefetch->bus_lower - 1) >> 32);
+#else
+			dm_pci_write_config32(dev, PCI_PREF_LIMIT_UPPER32, 0x0);
+#endif
+	}
+
+	if (pci_io) {
+		/* Round I/O allocator to 4KB boundary */
+		pciauto_region_align(pci_io, 0x1000);
+
+		dm_pci_write_config8(dev, PCI_IO_LIMIT,
+				((pci_io->bus_lower - 1) & 0x0000f000) >> 8);
+		dm_pci_write_config16(dev, PCI_IO_LIMIT_UPPER16,
+				((pci_io->bus_lower - 1) & 0xffff0000) >> 16);
+	}
+}
+
+/*
+ * HJF: Changed this to return int. I think this is required
+ * to get the correct result when scanning bridges
+ */
+int dm_pciauto_config_device(struct udevice *dev)
+{
+	struct pci_region *pci_mem;
+	struct pci_region *pci_prefetch;
+	struct pci_region *pci_io;
+	unsigned int sub_bus = PCI_BUS(dm_pci_get_bdf(dev));
+	unsigned short class;
+	bool enum_only = false;
+	int n;
+
+#ifdef CONFIG_PCI_ENUM_ONLY
+	enum_only = true;
+#endif
+	/* The root controller has the region information */
+	struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
+
+	pci_mem = ctlr_hose->pci_mem;
+	pci_prefetch = ctlr_hose->pci_prefetch;
+	pci_io = ctlr_hose->pci_io;
+
+	dm_pci_read_config16(dev, PCI_CLASS_DEVICE, &class);
+
+	switch (class) {
+	case PCI_CLASS_BRIDGE_PCI:
+		debug("PCI Autoconfig: Found P2P bridge, device %d\n",
+		      PCI_DEV(dm_pci_get_bdf(dev)));
+
+		dm_pciauto_setup_device(dev, 2, pci_mem, pci_prefetch, pci_io,
+					enum_only);
+
+		n = dm_pci_hose_probe_bus(dev);
+		if (n < 0)
+			return n;
+		sub_bus = (unsigned int)n;
+		break;
+
+	case PCI_CLASS_BRIDGE_CARDBUS:
+		/*
+		 * just do a minimal setup of the bridge,
+		 * let the OS take care of the rest
+		 */
+		dm_pciauto_setup_device(dev, 0, pci_mem, pci_prefetch, pci_io,
+					enum_only);
+
+		debug("PCI Autoconfig: Found P2CardBus bridge, device %d\n",
+		      PCI_DEV(dm_pci_get_bdf(dev)));
+
+		break;
+
+#if defined(CONFIG_PCIAUTO_SKIP_HOST_BRIDGE)
+	case PCI_CLASS_BRIDGE_OTHER:
+		debug("PCI Autoconfig: Skipping bridge device %d\n",
+		      PCI_DEV(dm_pci_get_bdf(dev)));
+		break;
+#endif
+#if defined(CONFIG_MPC834x) && !defined(CONFIG_VME8349)
+	case PCI_CLASS_BRIDGE_OTHER:
+		/*
+		 * The host/PCI bridge 1 seems broken in 8349 - it presents
+		 * itself as 'PCI_CLASS_BRIDGE_OTHER' and appears as an _agent_
+		 * device claiming resources io/mem/irq.. we only allow for
+		 * the PIMMR window to be allocated (BAR0 - 1MB size)
+		 */
+		debug("PCI Autoconfig: Broken bridge found, only minimal config\n");
+		dm_pciauto_setup_device(dev, 0, hose->pci_mem,
+					hose->pci_prefetch, hose->pci_io,
+					enum_only);
+		break;
+#endif
+
+	case PCI_CLASS_PROCESSOR_POWERPC: /* an agent or end-point */
+		debug("PCI AutoConfig: Found PowerPC device\n");
+
+	default:
+		dm_pciauto_setup_device(dev, 6, pci_mem, pci_prefetch, pci_io,
+					enum_only);
+		break;
+	}
+
+	return sub_bus;
+}
diff --git a/drivers/pci/pci_auto_old.c b/drivers/pci/pci_auto_old.c
index 1ff88b1..9126f78 100644
--- a/drivers/pci/pci_auto_old.c
+++ b/drivers/pci/pci_auto_old.c
@@ -180,18 +180,9 @@ void pciauto_prescan_setup_bridge(struct pci_controller *hose,
 	struct pci_region *pci_io;
 	u16 cmdstat, prefechable_64;
 
-#ifdef CONFIG_DM_PCI
-	/* The root controller has the region information */
-	struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
-
-	pci_mem = ctlr_hose->pci_mem;
-	pci_prefetch = ctlr_hose->pci_prefetch;
-	pci_io = ctlr_hose->pci_io;
-#else
 	pci_mem = hose->pci_mem;
 	pci_prefetch = hose->pci_prefetch;
 	pci_io = hose->pci_io;
-#endif
 
 	pci_hose_read_config_word(hose, dev, PCI_COMMAND, &cmdstat);
 	pci_hose_read_config_word(hose, dev, PCI_PREF_MEMORY_BASE,
@@ -199,15 +190,10 @@ void pciauto_prescan_setup_bridge(struct pci_controller *hose,
 	prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
 
 	/* Configure bus number registers */
-#ifdef CONFIG_DM_PCI
-	pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS, PCI_BUS(dev));
-	pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS, sub_bus);
-#else
 	pci_hose_write_config_byte(hose, dev, PCI_PRIMARY_BUS,
 				   PCI_BUS(dev) - hose->first_busno);
 	pci_hose_write_config_byte(hose, dev, PCI_SECONDARY_BUS,
 				   sub_bus - hose->first_busno);
-#endif
 	pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, 0xff);
 
 	if (pci_mem) {
@@ -274,26 +260,13 @@ void pciauto_postscan_setup_bridge(struct pci_controller *hose,
 	struct pci_region *pci_prefetch;
 	struct pci_region *pci_io;
 
-#ifdef CONFIG_DM_PCI
-	/* The root controller has the region information */
-	struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
-
-	pci_mem = ctlr_hose->pci_mem;
-	pci_prefetch = ctlr_hose->pci_prefetch;
-	pci_io = ctlr_hose->pci_io;
-#else
 	pci_mem = hose->pci_mem;
 	pci_prefetch = hose->pci_prefetch;
 	pci_io = hose->pci_io;
-#endif
 
 	/* Configure bus number registers */
-#ifdef CONFIG_DM_PCI
-	pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS, sub_bus);
-#else
 	pci_hose_write_config_byte(hose, dev, PCI_SUBORDINATE_BUS,
 				   sub_bus - hose->first_busno);
-#endif
 
 	if (pci_mem) {
 		/* Round memory allocator to 1MB boundary */
@@ -353,18 +326,9 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 	unsigned short class;
 	int n;
 
-#ifdef CONFIG_DM_PCI
-	/* The root controller has the region information */
-	struct pci_controller *ctlr_hose = pci_bus_to_hose(0);
-
-	pci_mem = ctlr_hose->pci_mem;
-	pci_prefetch = ctlr_hose->pci_prefetch;
-	pci_io = ctlr_hose->pci_io;
-#else
 	pci_mem = hose->pci_mem;
 	pci_prefetch = hose->pci_prefetch;
 	pci_io = hose->pci_io;
-#endif
 
 	pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 
@@ -376,12 +340,6 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 		pciauto_setup_device(hose, dev, 2, pci_mem,
 				     pci_prefetch, pci_io);
 
-#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);
@@ -396,7 +354,6 @@ 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_BRIDGE_CARDBUS:
@@ -410,9 +367,7 @@ int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev)
 		debug("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_internal.h b/drivers/pci/pci_internal.h
new file mode 100644
index 0000000..0867575
--- /dev/null
+++ b/drivers/pci/pci_internal.h
@@ -0,0 +1,50 @@
+/*
+ * Internal PCI functions, not exported outside drivers/pci
+ *
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __pci_internal_h
+#define __pci_internal_h
+
+/**
+ * dm_pciauto_prescan_setup_bridge() - Set up a bridge for scanning
+ *
+ * This gets a bridge ready so that its downstream devices can be scanned.
+ * It sets up the bus number and memory range registers. Once the scan is
+ * completed, dm_pciauto_postscan_setup_bridge() should be called.
+ *
+ * @dev:	Bridge device to be scanned
+ * @sub_bus:	Bus number of the 'other side' of the bridge
+ */
+void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus);
+
+/**
+ * dm_pciauto_postscan_setup_bridge() - Finish set up of a bridge after scanning
+ *
+ * This should be called after a bus scan is complete. It adjusts the memory
+ * ranges to fit with the devices actually found on the other side (downstream)
+ * of the bridge.
+ *
+ * @dev:	Bridge device that was scanned
+ * @sub_bus:	Bus number of the 'other side' of the bridge
+ */
+void dm_pciauto_postscan_setup_bridge(struct udevice *dev, int sub_bus);
+
+/**
+ * dm_pciauto_config_device() - Configure a PCI device ready for use
+ *
+ * If the device is a bridge, downstream devices will be probed.
+ *
+ * @dev:	Device to configure
+ * @return the maximum PCI bus number found by this device. If there are no
+ * bridges, this just returns the device's bus number. If the device is a
+ * bridge then it will return a larger number, depending on the devices on
+ * that bridge. On error, returns a -ve error number.
+ */
+int dm_pciauto_config_device(struct udevice *dev);
+
+#endif