diff --git a/src/cpu/amd/family_10h-family_15h/model_10xxx_init.c b/src/cpu/amd/family_10h-family_15h/model_10xxx_init.c
index 4009ba1..abf02a3 100644
--- a/src/cpu/amd/family_10h-family_15h/model_10xxx_init.c
+++ b/src/cpu/amd/family_10h-family_15h/model_10xxx_init.c
@@ -142,7 +142,8 @@
 		uint32_t f5x80;
 		uint8_t enabled;
 		uint8_t compute_unit_count = 0;
-		f5x80 = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18 + id.nodeid, 5)), 0x80);
+		f5x80 = pci_read_config32(pcidev_on_root(0x18 + id.nodeid, 5),
+									0x80);
 		enabled = f5x80 & 0xf;
 		if (enabled == 0x1)
 			compute_unit_count = 1;
@@ -161,11 +162,13 @@
 		uint32_t f0x160;
 		uint8_t core_count = 0;
 		uint8_t node_count = 0;
-		f0x60 = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18 + id.nodeid, 0)), 0x60);
+		f0x60 = pci_read_config32(pcidev_on_root(0x18 + id.nodeid, 0),
+									0x60);
 		core_count = (f0x60 >> 16) & 0x1f;
 		node_count = ((f0x60 >> 4) & 0x7) + 1;
 		if (is_gt_rev_d()) {
-			f0x160 = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18 + id.nodeid, 0)), 0x160);
+			f0x160 = pci_read_config32(
+				   pcidev_on_root(0x18 + id.nodeid, 0), 0x160);
 			core_count |= ((f0x160 >> 16) & 0x7) << 5;
 		}
 		core_count++;
diff --git a/src/cpu/amd/family_10h-family_15h/monotonic_timer.c b/src/cpu/amd/family_10h-family_15h/monotonic_timer.c
index aff1cee..ad83684 100644
--- a/src/cpu/amd/family_10h-family_15h/monotonic_timer.c
+++ b/src/cpu/amd/family_10h-family_15h/monotonic_timer.c
@@ -51,7 +51,8 @@
 
 	/* Get boost capability */
 	if ((model == 0x8) || (model == 0x9)) {	/* revision D */
-		boost_capable = (pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 4)), 0x15c) & 0x4) >> 2;
+		boost_capable = (pci_read_config32(pcidev_on_root(0x18, 4),
+							    0x15c) & 0x4) >> 2;
 	}
 
 	/* Set up TSC (BKDG v3.62 section 2.9.4)*/
diff --git a/src/cpu/amd/family_10h-family_15h/powernow_acpi.c b/src/cpu/amd/family_10h-family_15h/powernow_acpi.c
index 535b772..cf1646e 100644
--- a/src/cpu/amd/family_10h-family_15h/powernow_acpi.c
+++ b/src/cpu/amd/family_10h-family_15h/powernow_acpi.c
@@ -233,16 +233,17 @@
 	fam15h = !!(mctGetLogicalCPUID(0) & AMD_FAM15_ALL);
 	/* Get number of cores */
 	if (fam15h) {
-		cmp_cap = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 5)), 0x84) & 0xff;
+		cmp_cap = pci_read_config32(pcidev_on_root(0x18, 5), 0x84) &
+									  0xff;
 	} else {
-		dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 3)), 0xe8);
+		dtemp = pci_read_config32(pcidev_on_root(0x18, 3), 0xe8);
 		cmp_cap = (dtemp & 0x3000) >> 12;
 		if (mctGetLogicalCPUID(0) & (AMD_FAM10_REV_D | AMD_FAM15_ALL))	/* revision D or higher */
 			cmp_cap |= (dtemp & 0x8000) >> 13;
 	}
 
 	/* Get number of nodes */
-	dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 0)), 0x60);
+	dtemp = pci_read_config32(pcidev_on_root(0x18, 0), 0x60);
 	node_count = ((dtemp & 0x70) >> 4) + 1;
 	cores_per_node = cmp_cap + 1;
 
@@ -251,7 +252,7 @@
 
 	/* Get number of boost states */
 	uint8_t boost_count = 0;
-	dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 4)), 0x15c);
+	dtemp = pci_read_config32(pcidev_on_root(0x18, 4), 0x15c);
 	if (fam10h_rev_e)
 		boost_count = (dtemp >> 2) & 0x1;
 	else if (mctGetLogicalCPUID(0) & AMD_FAM15_ALL)
@@ -289,7 +290,7 @@
 	uint8_t single_link;
 
 	/* Determine if this is a PVI or SVI system */
-	dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 3)), 0xA0);
+	dtemp = pci_read_config32(pcidev_on_root(0x18, 3), 0xA0);
 
 	if (dtemp & PVI_MODE)
 		pviModeFlag = 1;
@@ -361,10 +362,10 @@
 		core_power = (core_voltage * cpuidd) / (expanded_cpuidv * 10);
 
 		/* Calculate transition latency */
-		dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 3)), 0xD4);
+		dtemp = pci_read_config32(pcidev_on_root(0x18, 3), 0xD4);
 		power_step_up = (dtemp & 0xf000000) >> 24;
 		power_step_down = (dtemp & 0xf00000) >> 20;
-		dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x18, 3)), 0xA0);
+		dtemp = pci_read_config32(pcidev_on_root(0x18, 3), 0xA0);
 		pll_lock_time = (dtemp & 0x3800) >> 11;
 		if (all_enabled_cores_have_same_cpufid)
 			core_latency = ((12 * power_step_down) + power_step_up) / 1000;
@@ -396,7 +397,7 @@
 	for (index = 0; index < total_core_count; index++) {
 		/* Determine if this is a single-link processor */
 		node_index = 0x18 + (index / cores_per_node);
-		dtemp = pci_read_config32(dev_find_slot(0, PCI_DEVFN(node_index, 0)), 0x80);
+		dtemp = pci_read_config32(pcidev_on_root(node_index, 0), 0x80);
 		single_link = !!(((dtemp & 0xff00) >> 8) == 0);
 
 		/* Enter processor core scope */
diff --git a/src/cpu/amd/family_10h-family_15h/processor_name.c b/src/cpu/amd/family_10h-family_15h/processor_name.c
index 478f0a51..5672efd 100644
--- a/src/cpu/amd/family_10h-family_15h/processor_name.c
+++ b/src/cpu/amd/family_10h-family_15h/processor_name.c
@@ -235,7 +235,7 @@
 	if (fam15h) {
 		/* Family 15h or later */
 		uint32_t dword;
-		struct device *cpu_fn5_dev = dev_find_slot(0, PCI_DEVFN(0x18, 5));
+		struct device *cpu_fn5_dev = pcidev_on_root(0x18, 5);
 		pci_write_config32(cpu_fn5_dev, 0x194, 0);
 		dword = pci_read_config32(cpu_fn5_dev, 0x198);
 		if (dword == 0) {
diff --git a/src/cpu/amd/family_10h-family_15h/ram_calc.c b/src/cpu/amd/family_10h-family_15h/ram_calc.c
index ab2cafd..57bd2fc 100644
--- a/src/cpu/amd/family_10h-family_15h/ram_calc.c
+++ b/src/cpu/amd/family_10h-family_15h/ram_calc.c
@@ -72,7 +72,7 @@
 		if (pci_read_config32(PCI_DEV(0, 0x18, 2), 0x118) & (0x1 << 18))
 			enable_cc6 = 1;
 #else
-		struct device *dct_dev = dev_find_slot(0, PCI_DEVFN(0x18, 2));
+		struct device *dct_dev = pcidev_on_root(0x18, 2);
 		if (pci_read_config32(dct_dev, 0x118) & (0x1 << 18))
 			enable_cc6 = 1;
 #endif
diff --git a/src/cpu/intel/haswell/smmrelocate.c b/src/cpu/intel/haswell/smmrelocate.c
index 36ea92a..3948cfe5 100644
--- a/src/cpu/intel/haswell/smmrelocate.c
+++ b/src/cpu/intel/haswell/smmrelocate.c
@@ -308,7 +308,7 @@
 void smm_info(uintptr_t *perm_smbase, size_t *perm_smsize,
 				size_t *smm_save_state_size)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	printk(BIOS_DEBUG, "Setting up SMI for CPU\n");
 
@@ -362,6 +362,6 @@
 	 * make the SMM registers writable again.
 	 */
 	printk(BIOS_DEBUG, "Locking SMM.\n");
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
+	pci_write_config8(pcidev_on_root(0, 0), SMRAM,
 			D_LCK | G_SMRAME | C_BASE_SEG);
 }
diff --git a/src/drivers/intel/gma/opregion.c b/src/drivers/intel/gma/opregion.c
index 57d03ad..0c51c70 100644
--- a/src/drivers/intel/gma/opregion.c
+++ b/src/drivers/intel/gma/opregion.c
@@ -77,7 +77,7 @@
 	u16 reg16;
 	u16 sci_reg;
 
-	igd = dev_find_slot(0, PCI_DEVFN(0x2, 0));
+	igd = pcidev_on_root(0x2, 0);
 	if (!igd || !igd->enabled)
 		return;
 
@@ -228,7 +228,7 @@
 static enum cb_err locate_vbt_vbios_cbfs(struct region_device *rdev)
 {
 	const u8 *oprom =
-		(const u8 *)pci_rom_probe(dev_find_slot(0, PCI_DEVFN(0x2, 0)));
+		(const u8 *)pci_rom_probe(pcidev_on_root(0x2, 0));
 	if (oprom == NULL)
 		return CB_ERR;
 
diff --git a/src/mainboard/amd/bettong/BiosCallOuts.c b/src/mainboard/amd/bettong/BiosCallOuts.c
index 1ddcb1c..c805015 100644
--- a/src/mainboard/amd/bettong/BiosCallOuts.c
+++ b/src/mainboard/amd/bettong/BiosCallOuts.c
@@ -120,7 +120,7 @@
 	int spdAddress;
 	AGESA_READ_SPD_PARAMS *info = ConfigPtr;
 
-	DEVTREE_CONST struct device *dev = dev_find_slot(0, PCI_DEVFN(0x18, 2));
+	DEVTREE_CONST struct device *dev = pcidev_on_root(0x18, 2);
 	DEVTREE_CONST struct northbridge_amd_pi_00660F01_config *config = dev->chip_info;
 	UINT8 spdAddrLookup_rev_F [2][2][4]= {
 		{ {0xA0, 0xA2}, {0xA4, 0xAC}, }, /* socket 0 - Channel 0 & 1 - 8-bit SPD addresses */
diff --git a/src/mainboard/amd/bettong/mptable.c b/src/mainboard/amd/bettong/mptable.c
index e541c0a..7c35f97 100644
--- a/src/mainboard/amd/bettong/mptable.c
+++ b/src/mainboard/amd/bettong/mptable.c
@@ -108,7 +108,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/gardenia/mptable.c b/src/mainboard/amd/gardenia/mptable.c
index 0cda7f7..428e575 100644
--- a/src/mainboard/amd/gardenia/mptable.c
+++ b/src/mainboard/amd/gardenia/mptable.c
@@ -113,7 +113,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/inagua/mptable.c b/src/mainboard/amd/inagua/mptable.c
index 6071868..8d1ec59 100644
--- a/src/mainboard/amd/inagua/mptable.c
+++ b/src/mainboard/amd/inagua/mptable.c
@@ -101,7 +101,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/mahogany_fam10/mainboard.c b/src/mainboard/amd/mahogany_fam10/mainboard.c
index 9c357f9..e2bc54e 100644
--- a/src/mainboard/amd/mahogany_fam10/mainboard.c
+++ b/src/mainboard/amd/mahogany_fam10/mainboard.c
@@ -31,7 +31,7 @@
 	u16 word;
 	struct device *sm_dev;
 	/* GPIO 6 reset PCIe slot, GPIO 4 reset GFX PCIe */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	word = pci_read_config16(sm_dev, 0xA8);
 	word |= (1 << 0) | (1 << 2);	/* Set Gpio6,4 as output */
@@ -44,7 +44,7 @@
 	u16 word;
 	struct device *sm_dev;
 	/* GPIO 6 reset PCIe slot, GPIO 4 reset GFX PCIe */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	word = pci_read_config16(sm_dev, 0xA8);
 	word &= ~((1 << 0) | (1 << 2));	/* Set Gpio6,4 as output */
@@ -64,13 +64,13 @@
 	/*u32 sm_dev, ide_dev; */
 	struct device *sm_dev, ide_dev;
 
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	byte = pci_read_config8(sm_dev, 0xA9);
 	byte |= (1 << 5);	/* Set Gpio9 as input */
 	pci_write_config8(sm_dev, 0xA9, byte);
 
-	ide_dev = dev_find_slot(0, PCI_DEVFN(0x14, 1));
+	ide_dev = pcidev_on_root(0x14, 1);
 	byte = pci_read_config8(ide_dev, 0x56);
 	byte &= ~(7 << 0);
 	if ((1 << 5) & pci_read_config8(sm_dev, 0xAA))
diff --git a/src/mainboard/amd/olivehill/mptable.c b/src/mainboard/amd/olivehill/mptable.c
index c94c9c8..c87749e 100644
--- a/src/mainboard/amd/olivehill/mptable.c
+++ b/src/mainboard/amd/olivehill/mptable.c
@@ -175,7 +175,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/olivehillplus/mptable.c b/src/mainboard/amd/olivehillplus/mptable.c
index 6c3b05a..cc5fa30 100644
--- a/src/mainboard/amd/olivehillplus/mptable.c
+++ b/src/mainboard/amd/olivehillplus/mptable.c
@@ -136,7 +136,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/parmer/mptable.c b/src/mainboard/amd/parmer/mptable.c
index e751811..a7d47c2 100644
--- a/src/mainboard/amd/parmer/mptable.c
+++ b/src/mainboard/amd/parmer/mptable.c
@@ -136,7 +136,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/persimmon/mptable.c b/src/mainboard/amd/persimmon/mptable.c
index 31e8264..2b2d05a 100644
--- a/src/mainboard/amd/persimmon/mptable.c
+++ b/src/mainboard/amd/persimmon/mptable.c
@@ -106,7 +106,7 @@
 	PCI_INT(0x2, 0x0, 0x0, intr_data_ptr[PIRQ_E]);	/* Use INTE */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0 */
diff --git a/src/mainboard/amd/south_station/mptable.c b/src/mainboard/amd/south_station/mptable.c
index 259e1f4..8052dc0 100644
--- a/src/mainboard/amd/south_station/mptable.c
+++ b/src/mainboard/amd/south_station/mptable.c
@@ -97,7 +97,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/thatcher/mptable.c b/src/mainboard/amd/thatcher/mptable.c
index 0c487c5..403a282 100644
--- a/src/mainboard/amd/thatcher/mptable.c
+++ b/src/mainboard/amd/thatcher/mptable.c
@@ -136,7 +136,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/amd/tilapia_fam10/mainboard.c b/src/mainboard/amd/tilapia_fam10/mainboard.c
index 5c052ec8..ec0144a 100644
--- a/src/mainboard/amd/tilapia_fam10/mainboard.c
+++ b/src/mainboard/amd/tilapia_fam10/mainboard.c
@@ -50,7 +50,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 1 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word |= (1 << 0);
 	word &= ~(1 << 4);
@@ -76,7 +76,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 0 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word &= ~(1 << 0);
 	word &= ~(1 << 4);
@@ -92,7 +92,7 @@
 	struct device *sm_dev;
 
 	/* access the smbus extended register */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/* put the GPIO68 output to tristate */
 	word = pci_read_config16(sm_dev, 0x7e);
@@ -130,7 +130,7 @@
 	pm2_iowrite(0xf1, byte);
 
 	/* access the smbus extended register */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/*if the dev3 is present, set the gfx to 2x8 lanes*/
 	/*otherwise set the gfx to 1x16 lanes*/
@@ -190,7 +190,7 @@
 	pm2_iowrite(0x42, byte);
 
 	/* set GPIO 64 to input */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x56);
 	word |= 1 << 7;
 	pci_write_config16(sm_dev, 0x56, word);
diff --git a/src/mainboard/amd/torpedo/mptable.c b/src/mainboard/amd/torpedo/mptable.c
index 4e0b8f1..2219d01 100644
--- a/src/mainboard/amd/torpedo/mptable.c
+++ b/src/mainboard/amd/torpedo/mptable.c
@@ -179,7 +179,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 
diff --git a/src/mainboard/amd/union_station/mptable.c b/src/mainboard/amd/union_station/mptable.c
index 259e1f4..8052dc0 100644
--- a/src/mainboard/amd/union_station/mptable.c
+++ b/src/mainboard/amd/union_station/mptable.c
@@ -97,7 +97,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/aopen/dxplplusu/fadt.c b/src/mainboard/aopen/dxplplusu/fadt.c
index b78a3ed..1d35982 100644
--- a/src/mainboard/aopen/dxplplusu/fadt.c
+++ b/src/mainboard/aopen/dxplplusu/fadt.c
@@ -32,7 +32,7 @@
 void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 {
 	acpi_header_t *header = &(fadt->header);
-	u16 pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f,0)), 0x40) & 0xfffe;
+	u16 pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), 0x40) & 0xfffe;
 
 	memset((void *) fadt, 0, sizeof(acpi_fadt_t));
 	memcpy(header->signature, "FACP", 4);
diff --git a/src/mainboard/asrock/e350m1/mptable.c b/src/mainboard/asrock/e350m1/mptable.c
index 54762d4..9c62712 100644
--- a/src/mainboard/asrock/e350m1/mptable.c
+++ b/src/mainboard/asrock/e350m1/mptable.c
@@ -100,7 +100,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/asrock/imb-a180/mptable.c b/src/mainboard/asrock/imb-a180/mptable.c
index 8e1b1c1..b641980 100644
--- a/src/mainboard/asrock/imb-a180/mptable.c
+++ b/src/mainboard/asrock/imb-a180/mptable.c
@@ -176,7 +176,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/asus/f2a85-m/mptable.c b/src/mainboard/asus/f2a85-m/mptable.c
index d97663d..0811fd2 100644
--- a/src/mainboard/asus/f2a85-m/mptable.c
+++ b/src/mainboard/asus/f2a85-m/mptable.c
@@ -142,7 +142,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/asus/kcma-d8/acpi_tables.c b/src/mainboard/asus/kcma-d8/acpi_tables.c
index c1006e5..ef07460 100644
--- a/src/mainboard/asus/kcma-d8/acpi_tables.c
+++ b/src/mainboard/asus/kcma-d8/acpi_tables.c
@@ -41,7 +41,7 @@
 					   IO_APIC_ADDR, gsi_base);
 	/* IOAPIC on rs5690 */
 	gsi_base += 24;		/* SB700 has 24 IOAPIC entries. */
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (dev) {
 		pci_write_config32(dev, 0xF8, 0x1);
 		dword = pci_read_config32(dev, 0xFC) & 0xfffffff0;
diff --git a/src/mainboard/asus/kcma-d8/mainboard.c b/src/mainboard/asus/kcma-d8/mainboard.c
index 8da41b0..729ad35 100644
--- a/src/mainboard/asus/kcma-d8/mainboard.c
+++ b/src/mainboard/asus/kcma-d8/mainboard.c
@@ -28,7 +28,7 @@
 {
 	struct device *pcie_core_dev;
 
-	pcie_core_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	pcie_core_dev = pcidev_on_root(0, 0);
 	set_htiu_enable_bits(pcie_core_dev, 0xA8, 0xFFFFFFFF, 0x28282828);
 	set_htiu_enable_bits(pcie_core_dev, 0xA9, 0x000000FF, 0x00000028);
 }
@@ -37,7 +37,7 @@
 {
 	struct device *pcie_core_dev;
 
-	pcie_core_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	pcie_core_dev = pcidev_on_root(0, 0);
 	set_htiu_enable_bits(pcie_core_dev, 0xA8, 0xFFFFFFFF, 0x6F6F6F6F);
 	set_htiu_enable_bits(pcie_core_dev, 0xA9, 0x000000FF, 0x0000006F);
 }
diff --git a/src/mainboard/asus/kcma-d8/mptable.c b/src/mainboard/asus/kcma-d8/mptable.c
index 44ba156..54cf5ed 100644
--- a/src/mainboard/asus/kcma-d8/mptable.c
+++ b/src/mainboard/asus/kcma-d8/mptable.c
@@ -102,7 +102,7 @@
 			 * 00:14.6: INTB MCI
 			 */
 		}
-		dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+		dev = pcidev_on_root(0, 0);
 		if (dev) {
 			pci_write_config32(dev, 0xF8, 0x1);
 			dword_ptr = (u32 *)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
@@ -125,32 +125,32 @@
 	smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, 0, (((11)<<2)|(0)), apicid_sr5650, 30);	/* Device 11 (LNKG, APIC pin 30) */
 	smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, 0, (((12)<<2)|(0)), apicid_sr5650, 30);	/* Device 12 (LNKG, APIC pin 30) */
 
-	dev = dev_find_slot(0, PCI_DEVFN(0x2, 0));
+	dev = pcidev_on_root(0x2, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0x2)|(0)), apicid_sr5650, 0);	/* card behind dev2 */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0x4, 0));
+	dev = pcidev_on_root(0x4, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0x4)|(0)), apicid_sr5650, 0);	/* PIKE */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0x9, 0));
+	dev = pcidev_on_root(0x9, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0x9)|(0)), apicid_sr5650, 23);	/* NIC A */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0xa, 0));
+	dev = pcidev_on_root(0xa, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0xa)|(0)), apicid_sr5650, 24);	/* NIC B */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0xb, 0));
+	dev = pcidev_on_root(0xb, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0xb)|(0)), apicid_sr5650, 0);	/* card behind dev11 */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0xc, 0));
+	dev = pcidev_on_root(0xc, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0xc)|(0)), apicid_sr5650, 0);	/* card behind dev12 */
@@ -177,7 +177,7 @@
 	PCI_INT(sp5100_bus_number, 0x11, 0x0, 0x16); /* 6, INTG */
 
 	/* PCI slots */
-	dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 
diff --git a/src/mainboard/asus/kfsn4-dre/acpi_tables.c b/src/mainboard/asus/kfsn4-dre/acpi_tables.c
index 36f55af..e5e2613 100644
--- a/src/mainboard/asus/kfsn4-dre/acpi_tables.c
+++ b/src/mainboard/asus/kfsn4-dre/acpi_tables.c
@@ -38,7 +38,7 @@
 	current = acpi_create_madt_lapics(current);
 
 	/* Write NVIDIA CK804 IOAPIC. */
-	dev = dev_find_slot(0x0, PCI_DEVFN(sysconf.sbdn + 0x1, 0));
+	dev = pcidev_on_root(sysconf.sbdn + 0x1, 0);
 	ASSERT(dev != NULL);
 
 	res = find_resource(dev, PCI_BASE_ADDRESS_1);
diff --git a/src/mainboard/asus/kgpe-d16/acpi_tables.c b/src/mainboard/asus/kgpe-d16/acpi_tables.c
index c1006e5..ef07460 100644
--- a/src/mainboard/asus/kgpe-d16/acpi_tables.c
+++ b/src/mainboard/asus/kgpe-d16/acpi_tables.c
@@ -41,7 +41,7 @@
 					   IO_APIC_ADDR, gsi_base);
 	/* IOAPIC on rs5690 */
 	gsi_base += 24;		/* SB700 has 24 IOAPIC entries. */
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (dev) {
 		pci_write_config32(dev, 0xF8, 0x1);
 		dword = pci_read_config32(dev, 0xFC) & 0xfffffff0;
diff --git a/src/mainboard/asus/kgpe-d16/mainboard.c b/src/mainboard/asus/kgpe-d16/mainboard.c
index 14a4a69..0285936 100644
--- a/src/mainboard/asus/kgpe-d16/mainboard.c
+++ b/src/mainboard/asus/kgpe-d16/mainboard.c
@@ -28,7 +28,7 @@
 {
 	struct device *pcie_core_dev;
 
-	pcie_core_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	pcie_core_dev = pcidev_on_root(0, 0);
 	set_htiu_enable_bits(pcie_core_dev, 0xA8, 0xFFFFFFFF, 0x28282828);
 	set_htiu_enable_bits(pcie_core_dev, 0xA9, 0x000000FF, 0x00000028);
 }
@@ -37,7 +37,7 @@
 {
 	struct device *pcie_core_dev;
 
-	pcie_core_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	pcie_core_dev = pcidev_on_root(0, 0);
 	set_htiu_enable_bits(pcie_core_dev, 0xA8, 0xFFFFFFFF, 0x6F6F6F6F);
 	set_htiu_enable_bits(pcie_core_dev, 0xA9, 0x000000FF, 0x0000006F);
 }
diff --git a/src/mainboard/asus/kgpe-d16/mptable.c b/src/mainboard/asus/kgpe-d16/mptable.c
index c1b2a5d..3b7ff52 100644
--- a/src/mainboard/asus/kgpe-d16/mptable.c
+++ b/src/mainboard/asus/kgpe-d16/mptable.c
@@ -102,7 +102,7 @@
 			 * 00:14.6: INTB MCI
 			 */
 		}
-		dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+		dev = pcidev_on_root(0, 0);
 		if (dev) {
 			pci_write_config32(dev, 0xF8, 0x1);
 			dword_ptr = (u32 *)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
@@ -126,37 +126,37 @@
 	smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, 0, (((12)<<2)|(0)), apicid_sr5650, 30);	/* Device 12 (LNKG, APIC pin 30) */
 	smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, 0, (((13)<<2)|(0)), apicid_sr5650, 30);	/* Device 13 (LNKG, APIC pin 30)) */
 
-	dev = dev_find_slot(0, PCI_DEVFN(0x2, 0));
+	dev = pcidev_on_root(0x2, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0x2)|(0)), apicid_sr5650, 0);	/* card behind dev2 */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0x4, 0));
+	dev = pcidev_on_root(0x4, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0x4)|(0)), apicid_sr5650, 0);	/* PIKE */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0x9, 0));
+	dev = pcidev_on_root(0x9, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0x9)|(0)), apicid_sr5650, 23);	/* NIC A */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0xa, 0));
+	dev = pcidev_on_root(0xa, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0xa)|(0)), apicid_sr5650, 24);	/* NIC B */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0xb, 0));
+	dev = pcidev_on_root(0xb, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0xb)|(0)), apicid_sr5650, 0);	/* card behind dev11 */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0xc, 0));
+	dev = pcidev_on_root(0xc, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0xc)|(0)), apicid_sr5650, 0);	/* card behind dev12 */
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(0xd, 0));
+	dev = pcidev_on_root(0xd, 0);
 	if (dev && dev->enabled) {
 		uint8_t bus_pci = dev->link_list->secondary;
 		smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, bus_pci, (((0)<<0xd)|(0)), apicid_sr5650, 0);	/* card behind dev13 */
@@ -183,7 +183,7 @@
 	PCI_INT(sp5100_bus_number, 0x11, 0x0, 0x16); /* 6, INTG */
 
 	/* PCI slots */
-	dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 
diff --git a/src/mainboard/asus/m4a78-em/mainboard.c b/src/mainboard/asus/m4a78-em/mainboard.c
index b075c69..fb01236 100644
--- a/src/mainboard/asus/m4a78-em/mainboard.c
+++ b/src/mainboard/asus/m4a78-em/mainboard.c
@@ -40,7 +40,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 1 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word |= (1 << 0);
 	word &= ~(1 << 4);
@@ -66,7 +66,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 0 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word &= ~(1 << 0);
 	word &= ~(1 << 4);
@@ -84,7 +84,7 @@
 	struct device *sm_dev;
 
 	/* access the smbus extended register */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/* put the GPIO68 output to tristate */
 	word = pci_read_config16(sm_dev, 0x7e);
diff --git a/src/mainboard/asus/m4a785-m/mainboard.c b/src/mainboard/asus/m4a785-m/mainboard.c
index 53c97b8..6d0f549 100644
--- a/src/mainboard/asus/m4a785-m/mainboard.c
+++ b/src/mainboard/asus/m4a785-m/mainboard.c
@@ -50,7 +50,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 1 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word |= (1 << 0);
 	word &= ~(1 << 4);
@@ -76,7 +76,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 0 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word &= ~(1 << 0);
 	word &= ~(1 << 4);
@@ -94,7 +94,7 @@
 	struct device *sm_dev;
 
 	/* access the smbus extended register */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/* put the GPIO68 output to tristate */
 	word = pci_read_config16(sm_dev, 0x7e);
@@ -136,7 +136,7 @@
 	pm2_iowrite(0x42, byte);
 
 	/* set GPIO 64 to input */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x56);
 	word |= 1 << 7;
 	pci_write_config16(sm_dev, 0x56, word);
diff --git a/src/mainboard/bap/ode_e20XX/mptable.c b/src/mainboard/bap/ode_e20XX/mptable.c
index fc14165..1808181 100644
--- a/src/mainboard/bap/ode_e20XX/mptable.c
+++ b/src/mainboard/bap/ode_e20XX/mptable.c
@@ -104,7 +104,7 @@
 	PCI_INT(0x2, 0x0, 0x0, intr_data_ptr[PIRQ_F]);
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0 */
diff --git a/src/mainboard/bap/ode_e21XX/mptable.c b/src/mainboard/bap/ode_e21XX/mptable.c
index 6c3b05a..cc5fa30 100644
--- a/src/mainboard/bap/ode_e21XX/mptable.c
+++ b/src/mainboard/bap/ode_e21XX/mptable.c
@@ -136,7 +136,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/biostar/a68n_5200/mptable.c b/src/mainboard/biostar/a68n_5200/mptable.c
index c94c9c8..c87749e 100644
--- a/src/mainboard/biostar/a68n_5200/mptable.c
+++ b/src/mainboard/biostar/a68n_5200/mptable.c
@@ -175,7 +175,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/biostar/am1ml/mptable.c b/src/mainboard/biostar/am1ml/mptable.c
index 637ae9a..6cb655e 100644
--- a/src/mainboard/biostar/am1ml/mptable.c
+++ b/src/mainboard/biostar/am1ml/mptable.c
@@ -104,7 +104,7 @@
 	PCI_INT(0x2, 0x0, 0x0, intr_data_ptr[PIRQ_F]);
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0 */
diff --git a/src/mainboard/elmex/pcm205400/mptable.c b/src/mainboard/elmex/pcm205400/mptable.c
index 31e8264..2b2d05a 100644
--- a/src/mainboard/elmex/pcm205400/mptable.c
+++ b/src/mainboard/elmex/pcm205400/mptable.c
@@ -106,7 +106,7 @@
 	PCI_INT(0x2, 0x0, 0x0, intr_data_ptr[PIRQ_E]);	/* Use INTE */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0 */
diff --git a/src/mainboard/emulation/qemu-q35/acpi_tables.c b/src/mainboard/emulation/qemu-q35/acpi_tables.c
index b8df509..99184ca 100644
--- a/src/mainboard/emulation/qemu-q35/acpi_tables.c
+++ b/src/mainboard/emulation/qemu-q35/acpi_tables.c
@@ -44,7 +44,7 @@
 void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 {
 	acpi_header_t *header = &(fadt->header);
-	u16 pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f,0)), 0x40) & 0xfffe;
+	u16 pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), 0x40) & 0xfffe;
 	memset((void *) fadt, 0, sizeof(acpi_fadt_t));
 	memcpy(header->signature, "FACP", 4);
 	header->length = sizeof(acpi_fadt_t);
diff --git a/src/mainboard/getac/p470/mainboard.c b/src/mainboard/getac/p470/mainboard.c
index 3e37ff8..5d271fd 100644
--- a/src/mainboard/getac/p470/mainboard.c
+++ b/src/mainboard/getac/p470/mainboard.c
@@ -59,16 +59,16 @@
 
 	struct device *dev;
 
-	dev = dev_find_slot(0, PCI_DEVFN(28,0));
+	dev = pcidev_on_root(28, 0);
 	if (dev) pci_write_config32(dev, 0x54, 0x0010a0e0);
 
-	dev = dev_find_slot(0, PCI_DEVFN(28,1));
+	dev = pcidev_on_root(28, 1);
 	if (dev) pci_write_config32(dev, 0x54, 0x0018a0e0);
 
-	dev = dev_find_slot(0, PCI_DEVFN(28,2));
+	dev = pcidev_on_root(28, 2);
 	if (dev) pci_write_config32(dev, 0x54, 0x0020a0e0);
 
-	dev = dev_find_slot(0, PCI_DEVFN(28,3));
+	dev = pcidev_on_root(28, 3);
 	if (dev) pci_write_config32(dev, 0x54, 0x0028a0e0);
 #endif
 }
diff --git a/src/mainboard/gigabyte/ma785gm/mainboard.c b/src/mainboard/gigabyte/ma785gm/mainboard.c
index 4c9799a5..d11deb0 100644
--- a/src/mainboard/gigabyte/ma785gm/mainboard.c
+++ b/src/mainboard/gigabyte/ma785gm/mainboard.c
@@ -40,7 +40,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 1 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word |= (1 << 0);
 	word &= ~(1 << 4);
@@ -66,7 +66,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 0 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word &= ~(1 << 0);
 	word &= ~(1 << 4);
@@ -106,7 +106,7 @@
 	pm2_iowrite(0xf1, byte);
 
 	/* access the smbus extended register */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/* set the gfx to 1x16 lanes */
 	printk(BIOS_INFO, "Dev3 is not present. GFX Configuration is One x16 slot\n");
diff --git a/src/mainboard/gigabyte/ma785gmt/mainboard.c b/src/mainboard/gigabyte/ma785gmt/mainboard.c
index 5949741..3b4edee 100644
--- a/src/mainboard/gigabyte/ma785gmt/mainboard.c
+++ b/src/mainboard/gigabyte/ma785gmt/mainboard.c
@@ -50,7 +50,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 1 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word |= (1 << 0);
 	word &= ~(1 << 4);
@@ -76,7 +76,7 @@
 	pm_iowrite(0x94, byte);
 
 	/* set the GPIO65 output enable and the value is 0 */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x7e);
 	word &= ~(1 << 0);
 	word &= ~(1 << 4);
@@ -92,7 +92,7 @@
 	struct device *sm_dev;
 
 	/* access the smbus extended register */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/* put the GPIO68 output to tristate */
 	word = pci_read_config16(sm_dev, 0x7e);
@@ -130,7 +130,7 @@
 	pm2_iowrite(0xf1, byte);
 
 	/* access the smbus extended register */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/*if the dev3 is present, set the gfx to 2x8 lanes*/
 	/*otherwise set the gfx to 1x16 lanes*/
@@ -190,7 +190,7 @@
 	pm2_iowrite(0x42, byte);
 
 	/* set GPIO 64 to input */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	word = pci_read_config16(sm_dev, 0x56);
 	word |= 1 << 7;
 	pci_write_config16(sm_dev, 0x56, word);
diff --git a/src/mainboard/gigabyte/ma78gm/mainboard.c b/src/mainboard/gigabyte/ma78gm/mainboard.c
index 6b0e229..ff52b7b 100644
--- a/src/mainboard/gigabyte/ma78gm/mainboard.c
+++ b/src/mainboard/gigabyte/ma78gm/mainboard.c
@@ -32,7 +32,7 @@
 	u16 word;
 	struct device *sm_dev;
 	/* GPIO 6 reset PCIe slot, GPIO 4 reset GFX PCIe */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	word = pci_read_config16(sm_dev, 0xA8);
 	word |= (1 << 0) | (1 << 2);	/* Set Gpio6,4 as output */
@@ -45,7 +45,7 @@
 	u16 word;
 	struct device *sm_dev;
 	/* GPIO 6 reset PCIe slot, GPIO 4 reset GFX PCIe */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	word = pci_read_config16(sm_dev, 0xA8);
 	word &= ~((1 << 0) | (1 << 2));	/* Set Gpio6,4 as output */
diff --git a/src/mainboard/gizmosphere/gizmo/mainboard.c b/src/mainboard/gizmosphere/gizmo/mainboard.c
index ecd770b..04d3ac1 100644
--- a/src/mainboard/gizmosphere/gizmo/mainboard.c
+++ b/src/mainboard/gizmosphere/gizmo/mainboard.c
@@ -52,7 +52,7 @@
 	uintptr_t ABAR;
 	u8 *memptr;
 
-	ahci_dev = dev_find_slot(0, PCI_DEVFN(0x11, 0));
+	ahci_dev = pcidev_on_root(0x11, 0);
 	ABAR = pci_read_config32(ahci_dev, 0x24);
 	ABAR &= 0xFFFFFC00;
 	memptr = (u8 *)(ABAR + 0x100 + 0x80 + 0x2C); /* we're on the 2nd port */
diff --git a/src/mainboard/gizmosphere/gizmo/mptable.c b/src/mainboard/gizmosphere/gizmo/mptable.c
index 6208aae..d44e276 100644
--- a/src/mainboard/gizmosphere/gizmo/mptable.c
+++ b/src/mainboard/gizmosphere/gizmo/mptable.c
@@ -98,7 +98,7 @@
 	/* on board NIC & Slot PCIE.	*/
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/gizmosphere/gizmo2/mptable.c b/src/mainboard/gizmosphere/gizmo2/mptable.c
index fc14165..1808181 100644
--- a/src/mainboard/gizmosphere/gizmo2/mptable.c
+++ b/src/mainboard/gizmosphere/gizmo2/mptable.c
@@ -104,7 +104,7 @@
 	PCI_INT(0x2, 0x0, 0x0, intr_data_ptr[PIRQ_F]);
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0 */
diff --git a/src/mainboard/google/kahlee/mptable.c b/src/mainboard/google/kahlee/mptable.c
index 0cda7f7..428e575 100644
--- a/src/mainboard/google/kahlee/mptable.c
+++ b/src/mainboard/google/kahlee/mptable.c
@@ -113,7 +113,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/google/link/mainboard.c b/src/mainboard/google/link/mainboard.c
index 4919e6b..6c896fc 100644
--- a/src/mainboard/google/link/mainboard.c
+++ b/src/mainboard/google/link/mainboard.c
@@ -151,7 +151,7 @@
 		/* If running on proto1 - enable reversion of gpio11. */
 		u32 gpio_inv;
 		u16 gpio_base = pci_read_config16
-			(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), GPIO_BASE) &
+			(pcidev_on_root(0x1f, 0), GPIO_BASE) &
 			0xfffc;
 		u16 gpio_inv_addr = gpio_base + GPI_INV;
 		gpio_inv = inl(gpio_inv_addr);
diff --git a/src/mainboard/google/link/romstage.c b/src/mainboard/google/link/romstage.c
index b8c13a1..73d33a3 100644
--- a/src/mainboard/google/link/romstage.c
+++ b/src/mainboard/google/link/romstage.c
@@ -39,7 +39,7 @@
 	const struct device *lpc;
 	const struct southbridge_intel_bd82x6x_config *config = NULL;
 
-	lpc = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	lpc = pcidev_on_root(0x1f, 0);
 	if (!lpc)
 		return;
 	if (lpc->chip_info)
diff --git a/src/mainboard/hp/abm/mptable.c b/src/mainboard/hp/abm/mptable.c
index c94c9c8..c87749e 100644
--- a/src/mainboard/hp/abm/mptable.c
+++ b/src/mainboard/hp/abm/mptable.c
@@ -175,7 +175,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/hp/pavilion_m6_1035dx/mptable.c b/src/mainboard/hp/pavilion_m6_1035dx/mptable.c
index 66f8f46..08de04e 100644
--- a/src/mainboard/hp/pavilion_m6_1035dx/mptable.c
+++ b/src/mainboard/hp/pavilion_m6_1035dx/mptable.c
@@ -142,7 +142,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/jetway/nf81-t56n-lf/mptable.c b/src/mainboard/jetway/nf81-t56n-lf/mptable.c
index 6deafaa..2522954 100644
--- a/src/mainboard/jetway/nf81-t56n-lf/mptable.c
+++ b/src/mainboard/jetway/nf81-t56n-lf/mptable.c
@@ -110,7 +110,7 @@
 	PCI_INT(0x2, 0x0, 0x0, intr_data_ptr[PIRQ_E]);	/* Use INTE */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0 */
diff --git a/src/mainboard/jetway/pa78vm5/mainboard.c b/src/mainboard/jetway/pa78vm5/mainboard.c
index 066bd2e..444cd33 100644
--- a/src/mainboard/jetway/pa78vm5/mainboard.c
+++ b/src/mainboard/jetway/pa78vm5/mainboard.c
@@ -32,7 +32,7 @@
 	u16 word;
 	struct device *sm_dev;
 	/* GPIO 6 reset PCIe slot, GPIO 4 reset GFX PCIe */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	word = pci_read_config16(sm_dev, 0xA8);
 	word |= (1 << 0) | (1 << 2);	/* Set Gpio6,4 as output */
@@ -45,7 +45,7 @@
 	u16 word;
 	struct device *sm_dev;
 	/* GPIO 6 reset PCIe slot, GPIO 4 reset GFX PCIe */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	word = pci_read_config16(sm_dev, 0xA8);
 	word &= ~((1 << 0) | (1 << 2));	/* Set Gpio6,4 as output */
@@ -65,13 +65,13 @@
 	/*u32 sm_dev, ide_dev; */
 	struct device *sm_dev, ide_dev;
 
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	byte = pci_read_config8(sm_dev, 0xA9);
 	byte |= (1 << 5);	/* Set Gpio9 as input */
 	pci_write_config8(sm_dev, 0xA9, byte);
 
-	ide_dev = dev_find_slot(0, PCI_DEVFN(0x14, 1));
+	ide_dev = pcidev_on_root(0x14, 1);
 	byte = pci_read_config8(ide_dev, 0x56);
 	byte &= ~(7 << 0);
 	if ((1 << 5) & pci_read_config8(sm_dev, 0xAA))
diff --git a/src/mainboard/kontron/ktqm77/mainboard.c b/src/mainboard/kontron/ktqm77/mainboard.c
index 37f0240..3447646 100644
--- a/src/mainboard/kontron/ktqm77/mainboard.c
+++ b/src/mainboard/kontron/ktqm77/mainboard.c
@@ -172,7 +172,7 @@
 
 	unsigned disable = 0;
 	if ((get_option(&disable, "ethernet1") == CB_SUCCESS) && disable) {
-		struct device *nic = dev_find_slot(0, PCI_DEVFN(0x1c, 2));
+		struct device *nic = pcidev_on_root(0x1c, 2);
 		if (nic) {
 			printk(BIOS_DEBUG, "DISABLE FIRST NIC!\n");
 			nic->enabled = 0;
@@ -180,7 +180,7 @@
 	}
 	disable = 0;
 	if ((get_option(&disable, "ethernet2") == CB_SUCCESS) && disable) {
-		struct device *nic = dev_find_slot(0, PCI_DEVFN(0x1c, 3));
+		struct device *nic = pcidev_on_root(0x1c, 3);
 		if (nic) {
 			printk(BIOS_DEBUG, "DISABLE SECOND NIC!\n");
 			nic->enabled = 0;
diff --git a/src/mainboard/lenovo/g505s/mptable.c b/src/mainboard/lenovo/g505s/mptable.c
index 66f8f46..08de04e 100644
--- a/src/mainboard/lenovo/g505s/mptable.c
+++ b/src/mainboard/lenovo/g505s/mptable.c
@@ -142,7 +142,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/lenovo/t400/fadt.c b/src/mainboard/lenovo/t400/fadt.c
index 5596115..ab257f8 100644
--- a/src/mainboard/lenovo/t400/fadt.c
+++ b/src/mainboard/lenovo/t400/fadt.c
@@ -22,7 +22,7 @@
 void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 {
 	acpi_header_t *header = &(fadt->header);
-	u16 pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f,0)), 0x40) & 0xfffe;
+	u16 pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), 0x40) & 0xfffe;
 
 	memset((void *) fadt, 0, sizeof(acpi_fadt_t));
 	memcpy(header->signature, "FACP", 4);
diff --git a/src/mainboard/lenovo/t60/mainboard.c b/src/mainboard/lenovo/t60/mainboard.c
index bb52c87..90bdc39 100644
--- a/src/mainboard/lenovo/t60/mainboard.c
+++ b/src/mainboard/lenovo/t60/mainboard.c
@@ -51,7 +51,7 @@
 	if (acpi_is_wakeup_s3())
 		ec_write(0x0c, 0xc7);
 
-	idedev = dev_find_slot(0, PCI_DEVFN(0x1f,1));
+	idedev = pcidev_on_root(0x1f, 1);
 
 	if (!(inb(DEFAULT_GPIOBASE + 0x0c) & 0x40)) {
 		/* legacy I/O connected */
diff --git a/src/mainboard/lenovo/x200/fadt.c b/src/mainboard/lenovo/x200/fadt.c
index 5596115..ab257f8 100644
--- a/src/mainboard/lenovo/x200/fadt.c
+++ b/src/mainboard/lenovo/x200/fadt.c
@@ -22,7 +22,7 @@
 void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 {
 	acpi_header_t *header = &(fadt->header);
-	u16 pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f,0)), 0x40) & 0xfffe;
+	u16 pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), 0x40) & 0xfffe;
 
 	memset((void *) fadt, 0, sizeof(acpi_fadt_t));
 	memcpy(header->signature, "FACP", 4);
diff --git a/src/mainboard/lenovo/x201/mainboard.c b/src/mainboard/lenovo/x201/mainboard.c
index 419f817..182d041 100644
--- a/src/mainboard/lenovo/x201/mainboard.c
+++ b/src/mainboard/lenovo/x201/mainboard.c
@@ -82,7 +82,7 @@
 	dev->ops->init = mainboard_init;
 	dev->ops->acpi_fill_ssdt_generator = fill_ssdt;
 
-	pmbase = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x1f, 0)),
+	pmbase = pci_read_config32(pcidev_on_root(0x1f, 0),
 				   PMBASE) & 0xff80;
 
 	printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", pmbase);
@@ -90,9 +90,9 @@
 	outl(0, pmbase + SMI_EN);
 
 	enable_lapic();
-	pci_write_config32(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), GPIO_BASE,
+	pci_write_config32(pcidev_on_root(0x1f, 0), GPIO_BASE,
 			   DEFAULT_GPIOBASE | 1);
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), GPIO_CNTL,
+	pci_write_config8(pcidev_on_root(0x1f, 0), GPIO_CNTL,
 			  0x10);
 
 	/* If we're resuming from suspend, blink suspend LED */
diff --git a/src/mainboard/lenovo/x60/mainboard.c b/src/mainboard/lenovo/x60/mainboard.c
index 96d8062..5cf0d26 100644
--- a/src/mainboard/lenovo/x60/mainboard.c
+++ b/src/mainboard/lenovo/x60/mainboard.c
@@ -87,7 +87,7 @@
 	if (acpi_is_wakeup_s3())
 		ec_write(0x0c, 0xc7);
 
-	idedev = dev_find_slot(0, PCI_DEVFN(0x1f,1));
+	idedev = pcidev_on_root(0x1f, 1);
 	if (idedev && idedev->chip_info && dock_ultrabay_device_present()) {
 		struct southbridge_intel_i82801gx_config *config = idedev->chip_info;
 		config->ide_enable_primary = 1;
diff --git a/src/mainboard/lenovo/z61t/mainboard.c b/src/mainboard/lenovo/z61t/mainboard.c
index 5a565e0..c7e7868 100644
--- a/src/mainboard/lenovo/z61t/mainboard.c
+++ b/src/mainboard/lenovo/z61t/mainboard.c
@@ -51,7 +51,7 @@
 	if (acpi_is_wakeup_s3())
 		ec_write(0x0c, 0xc7);
 
-	idedev = dev_find_slot(0, PCI_DEVFN(0x1f,1));
+	idedev = pcidev_on_root(0x1f, 1);
 
 	if (!(inb(DEFAULT_GPIOBASE + 0x0c) & 0x40)) {
 		/* legacy I/O connected */
diff --git a/src/mainboard/lippert/frontrunner-af/mainboard.c b/src/mainboard/lippert/frontrunner-af/mainboard.c
index cc25957..9660a73 100644
--- a/src/mainboard/lippert/frontrunner-af/mainboard.c
+++ b/src/mainboard/lippert/frontrunner-af/mainboard.c
@@ -97,7 +97,8 @@
 	}
 
 	/* Lower SPI speed from default 66 to 22 MHz for SST 25VF032B */
-	spi_base = (u8*)((uintptr_t)pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x14, 3)), 0xA0) & 0xFFFFFFE0);
+	spi_base = (u8 *)((uintptr_t)pci_read_config32(pcidev_on_root(0x14, 3),
+							   0xA0) & 0xFFFFFFE0);
 	spi_base[0x0D] = (spi_base[0x0D] & ~0x30) | 0x20; // NormSpeed in SPI_Cntrl1 register
 
 	/* Notify the SMC we're alive and kicking, or after a while it will
diff --git a/src/mainboard/lippert/frontrunner-af/mptable.c b/src/mainboard/lippert/frontrunner-af/mptable.c
index 26d22cd..5e3a950 100644
--- a/src/mainboard/lippert/frontrunner-af/mptable.c
+++ b/src/mainboard/lippert/frontrunner-af/mptable.c
@@ -97,7 +97,7 @@
 	/* on board NIC & Slot PCIE.	*/
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/lippert/toucan-af/mainboard.c b/src/mainboard/lippert/toucan-af/mainboard.c
index cea5350..5cb0916 100644
--- a/src/mainboard/lippert/toucan-af/mainboard.c
+++ b/src/mainboard/lippert/toucan-af/mainboard.c
@@ -63,7 +63,8 @@
 	       fch_gpio_state(58)<<2 | fch_gpio_state(57)<<1 | fch_gpio_state(56));
 
 	/* Lower SPI speed from default 66 to 22 MHz for SST 25VF032B */
-	spi_base = (u8*)((uintptr_t)pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x14, 3)), 0xA0) & 0xFFFFFFE0);
+	spi_base = (u8 *)((uintptr_t)pci_read_config32(pcidev_on_root(0x14, 3),
+							   0xA0) & 0xFFFFFFE0);
 	spi_base[0x0D] = (spi_base[0x0D] & ~0x30) | 0x20; // NormSpeed in SPI_Cntrl1 register
 
 	/* Notify the SMC we're alive and kicking, or after a while it will
diff --git a/src/mainboard/lippert/toucan-af/mptable.c b/src/mainboard/lippert/toucan-af/mptable.c
index 26d22cd..5e3a950 100644
--- a/src/mainboard/lippert/toucan-af/mptable.c
+++ b/src/mainboard/lippert/toucan-af/mptable.c
@@ -97,7 +97,7 @@
 	/* on board NIC & Slot PCIE.	*/
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/msi/ms7721/mptable.c b/src/mainboard/msi/ms7721/mptable.c
index d97663d..0811fd2 100644
--- a/src/mainboard/msi/ms7721/mptable.c
+++ b/src/mainboard/msi/ms7721/mptable.c
@@ -142,7 +142,7 @@
 	/* on board NIC & Slot PCIE.  */
 
 	/* PCI slots */
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev = pcidev_on_root(0x14, 4);
 	if (dev && dev->enabled) {
 		u8 bus_pci = dev->link_list->secondary;
 		/* PCI_SLOT 0. */
diff --git a/src/mainboard/packardbell/ms2290/mainboard.c b/src/mainboard/packardbell/ms2290/mainboard.c
index de9f13d..1fe57d6 100644
--- a/src/mainboard/packardbell/ms2290/mainboard.c
+++ b/src/mainboard/packardbell/ms2290/mainboard.c
@@ -99,7 +99,7 @@
 	for (i = 0; i < 256; i++)
 		ec_write (i, dmp[i]);
 
-	pmbase = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0x1f, 0)),
+	pmbase = pci_read_config32(pcidev_on_root(0x1f, 0),
 				   PMBASE) & 0xff80;
 
 	printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", pmbase);
@@ -107,9 +107,9 @@
 	outl(0, pmbase + SMI_EN);
 
 	enable_lapic();
-	pci_write_config32(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), GPIO_BASE,
+	pci_write_config32(pcidev_on_root(0x1f, 0), GPIO_BASE,
 			   DEFAULT_GPIOBASE | 1);
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), GPIO_CNTL,
+	pci_write_config8(pcidev_on_root(0x1f, 0), GPIO_CNTL,
 			  0x10);
 
 	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_INT_LVDS, GMA_INT15_PANEL_FIT_DEFAULT, GMA_INT15_BOOT_DISPLAY_LFP, 2);
diff --git a/src/mainboard/pcengines/apu1/mainboard.c b/src/mainboard/pcengines/apu1/mainboard.c
index 1105d5f..a9ce66b 100644
--- a/src/mainboard/pcengines/apu1/mainboard.c
+++ b/src/mainboard/pcengines/apu1/mainboard.c
@@ -255,7 +255,7 @@
  */
 static void usb_oc_setup(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x12, 0));
+	struct device *dev = pcidev_on_root(0x12, 0);
 
 	pci_write_config32(dev, 0x58, 0x011f0);
 }
diff --git a/src/mainboard/pcengines/apu2/mainboard.c b/src/mainboard/pcengines/apu2/mainboard.c
index 6a01a8b..b875437 100644
--- a/src/mainboard/pcengines/apu2/mainboard.c
+++ b/src/mainboard/pcengines/apu2/mainboard.c
@@ -207,7 +207,7 @@
 	 * Read secondary bus number from the PCIe bridge where the first NIC is
 	 * connected.
 	 */
-	dev = dev_find_slot(0, PCI_DEVFN(2, 2));
+	dev = pcidev_on_root(2, 2);
 	if ((serial[0] != 0) || !dev)
 		return serial;
 
diff --git a/src/mainboard/roda/rk9/fadt.c b/src/mainboard/roda/rk9/fadt.c
index 5596115..ab257f8 100644
--- a/src/mainboard/roda/rk9/fadt.c
+++ b/src/mainboard/roda/rk9/fadt.c
@@ -22,7 +22,7 @@
 void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 {
 	acpi_header_t *header = &(fadt->header);
-	u16 pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f,0)), 0x40) & 0xfffe;
+	u16 pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), 0x40) & 0xfffe;
 
 	memset((void *) fadt, 0, sizeof(acpi_fadt_t));
 	memcpy(header->signature, "FACP", 4);
diff --git a/src/mainboard/siemens/mc_bdx1/mainboard.c b/src/mainboard/siemens/mc_bdx1/mainboard.c
index 1e6acc7..d137586 100644
--- a/src/mainboard/siemens/mc_bdx1/mainboard.c
+++ b/src/mainboard/siemens/mc_bdx1/mainboard.c
@@ -103,7 +103,7 @@
 static void mainboard_init(void *chip_info)
 {
 	uint8_t actl = 0;
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 
 	/* Route SCI to IRQ 10 to free IRQ 9 slot. */
 	actl = pci_read_config8(dev, ACPI_CNTL_OFFSET);
@@ -120,7 +120,7 @@
 {
 	void *spi_base = NULL;
 	uint32_t rcba = 0;
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 
 	/* Get address of SPI controller. */
 	rcba = (pci_read_config32(dev, 0xf0) & 0xffffc000);
diff --git a/src/mainboard/supermicro/h8scm_fam10/mainboard.c b/src/mainboard/supermicro/h8scm_fam10/mainboard.c
index 9ff4339..7ae3d70 100644
--- a/src/mainboard/supermicro/h8scm_fam10/mainboard.c
+++ b/src/mainboard/supermicro/h8scm_fam10/mainboard.c
@@ -36,7 +36,7 @@
 {
 	struct device *pcie_core_dev;
 
-	pcie_core_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	pcie_core_dev = pcidev_on_root(0, 0);
 	set_htiu_enable_bits(pcie_core_dev, 0xA8, 0xFFFFFFFF, 0x28282828);
 	set_htiu_enable_bits(pcie_core_dev, 0xA9, 0x000000FF, 0x00000028);
 }
@@ -45,7 +45,7 @@
 {
 	struct device *pcie_core_dev;
 
-	pcie_core_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	pcie_core_dev = pcidev_on_root(0, 0);
 	set_htiu_enable_bits(pcie_core_dev, 0xA8, 0xFFFFFFFF, 0x6F6F6F6F);
 	set_htiu_enable_bits(pcie_core_dev, 0xA9, 0x000000FF, 0x0000006F);
 }
diff --git a/src/northbridge/amd/amdfam10/northbridge.c b/src/northbridge/amd/amdfam10/northbridge.c
index d652746..c0c6eeb 100644
--- a/src/northbridge/amd/amdfam10/northbridge.c
+++ b/src/northbridge/amd/amdfam10/northbridge.c
@@ -1459,7 +1459,7 @@
 	nb_cfg_54 = read_nb_cfg_54();
 
 #if CONFIG_CBB
-	dev_mc = dev_find_slot(0, PCI_DEVFN(CONFIG_CDB, 0)); //0x00
+	dev_mc = pcidev_on_root(CONFIG_CDB, 0); //0x00
 	if (dev_mc && dev_mc->bus) {
 		printk(BIOS_DEBUG, "%s found", dev_path(dev_mc));
 		pci_domain = dev_mc->bus->dev;
@@ -1475,7 +1475,7 @@
 	}
 	dev_mc = dev_find_slot(CONFIG_CBB, PCI_DEVFN(CONFIG_CDB, 0));
 	if (!dev_mc) {
-		dev_mc = dev_find_slot(0, PCI_DEVFN(0x18, 0));
+		dev_mc = pcidev_on_root(0x18, 0);
 		if (dev_mc && dev_mc->bus) {
 			printk(BIOS_DEBUG, "%s found\n", dev_path(dev_mc));
 			pci_domain = dev_mc->bus->dev;
@@ -1719,8 +1719,8 @@
 
 		/* Disable L3 and DRAM scrubbers and configure system for probe filter support */
 		for (i = 0; i < sysconf.nodes; i++) {
-			struct device *f2x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 2));
-			struct device *f3x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 3));
+			struct device *f2x_dev = pcidev_on_root(0x18 + i, 2);
+			struct device *f3x_dev = pcidev_on_root(0x18 + i, 3);
 
 			f3x58[i] = pci_read_config32(f3x_dev, 0x58);
 			f3x5c[i] = pci_read_config32(f3x_dev, 0x5c);
@@ -1789,7 +1789,7 @@
 
 		/* Enable probe filter */
 		for (i = 0; i < sysconf.nodes; i++) {
-			struct device *f3x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 3));
+			struct device *f3x_dev = pcidev_on_root(0x18 + i, 3);
 
 			dword = pci_read_config32(f3x_dev, 0x1c4);
 			dword |= (0x1 << 31);	/* L3TagInit = 1 */
@@ -1810,8 +1810,10 @@
 
 			/* Enable ATM mode */
 			for (i = 0; i < sysconf.nodes; i++) {
-				struct device *f0x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 0));
-				struct device *f3x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 3));
+				struct device *f0x_dev =
+						   pcidev_on_root(0x18 + i, 0);
+				struct device *f3x_dev =
+						   pcidev_on_root(0x18 + i, 3);
 
 				dword = pci_read_config32(f0x_dev, 0x68);
 				dword |= (0x1 << 12);	/* ATMModeEn = 1 */
@@ -1827,7 +1829,7 @@
 
 		/* Reenable L3 and DRAM scrubbers */
 		for (i = 0; i < sysconf.nodes; i++) {
-			struct device *f3x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 3));
+			struct device *f3x_dev = pcidev_on_root(0x18 + i, 3);
 
 			pci_write_config32(f3x_dev, 0x58, f3x58[i]);
 			pci_write_config32(f3x_dev, 0x5c, f3x5c[i]);
@@ -1863,9 +1865,9 @@
 		uint8_t dual_node = 0;
 
 		for (i = 0; i < sysconf.nodes; i++) {
-			struct device *f3x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 3));
-			struct device *f4x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 4));
-			struct device *f5x_dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 5));
+			struct device *f3x_dev = pcidev_on_root(0x18 + i, 3);
+			struct device *f4x_dev = pcidev_on_root(0x18 + i, 4);
+			struct device *f5x_dev = pcidev_on_root(0x18 + i, 5);
 
 			f3xe8 = pci_read_config32(f3x_dev, 0xe8);
 
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c
index c4db5c5..7267f12 100644
--- a/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c
+++ b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c
@@ -80,7 +80,7 @@
 #ifdef __PRE_RAM__
 		pci_devfn_t dev_fn1 = PCI_DEV(0, 0x18 + node, 1);
 #else
-		struct device *dev_fn1 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 1));
+		struct device *dev_fn1 = pcidev_on_root(0x18 + node, 1);
 #endif
 
 		/* Select DCT */
@@ -109,7 +109,7 @@
 #ifdef __PRE_RAM__
 		pci_devfn_t dev_fn1 = PCI_DEV(0, 0x18 + node, 1);
 #else
-		struct device *dev_fn1 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 1));
+		struct device *dev_fn1 = pcidev_on_root(0x18 + node, 1);
 #endif
 
 		/* Select DCT */
@@ -159,7 +159,7 @@
 #ifdef __PRE_RAM__
 		pci_devfn_t dev_fn1 = PCI_DEV(0, 0x18 + node, 1);
 #else
-		struct device *dev_fn1 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 1));
+		struct device *dev_fn1 = pcidev_on_root(0x18 + node, 1);
 #endif
 
 		/* Select DCT */
@@ -280,7 +280,7 @@
 					   uint32_t reg)
 {
 	uint32_t dword;
-	struct device *dev_fn1 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 1));
+	struct device *dev_fn1 = pcidev_on_root(0x18 + node, 1);
 
 	/* Select DCT */
 	dword = pci_read_config32(dev_fn1, 0x10c);
@@ -343,9 +343,9 @@
 
 	/* Load data from DCTs into data structure */
 	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
-		struct device *dev_fn1 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 1));
-		struct device *dev_fn2 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 2));
-		struct device *dev_fn3 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 3));
+		struct device *dev_fn1 = pcidev_on_root(0x18 + node, 1);
+		struct device *dev_fn2 = pcidev_on_root(0x18 + node, 2);
+		struct device *dev_fn3 = pcidev_on_root(0x18 + node, 3);
 		/* Test for node presence */
 		if ((!dev_fn1) || (pci_read_config32(dev_fn1, PCI_VENDOR_ID) == 0xffffffff)) {
 			persistent_data->node[node].node_present = 0;
diff --git a/src/northbridge/intel/e7505/northbridge.c b/src/northbridge/intel/e7505/northbridge.c
index b4752c4..317f087 100644
--- a/src/northbridge/intel/e7505/northbridge.c
+++ b/src/northbridge/intel/e7505/northbridge.c
@@ -38,7 +38,7 @@
 
 	pci_domain_read_resources(dev);
 
-	mc_dev = dev_find_slot(0, PCI_DEVFN(0x0, 0));
+	mc_dev = pcidev_on_root(0, 0);
 	if (!mc_dev)
 		die("Could not find MCH device\n");
 
diff --git a/src/northbridge/intel/fsp_rangeley/northbridge.c b/src/northbridge/intel/fsp_rangeley/northbridge.c
index 93d9c63..25560dd 100644
--- a/src/northbridge/intel/fsp_rangeley/northbridge.c
+++ b/src/northbridge/intel/fsp_rangeley/northbridge.c
@@ -39,7 +39,7 @@
 	if (bridge_revision_id < 0) {
 		uint8_t stepping = cpuid_eax(1) & 0xf;
 		uint8_t bridge_id = pci_read_config16(
-			dev_find_slot(0, PCI_DEVFN(0, 0)),
+			pcidev_on_root(0, 0),
 			PCI_DEVICE_ID) & 0xf0;
 		bridge_revision_id = bridge_id | stepping;
 	}
@@ -62,7 +62,7 @@
 
 	*base = 0;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (!dev)
 		return 0;
 
diff --git a/src/northbridge/intel/gm45/acpi.c b/src/northbridge/intel/gm45/acpi.c
index 467c6c1..dc59372 100644
--- a/src/northbridge/intel/gm45/acpi.c
+++ b/src/northbridge/intel/gm45/acpi.c
@@ -68,9 +68,11 @@
 
 static unsigned long acpi_fill_dmar(unsigned long current)
 {
-	int me_active = (dev_find_slot(0, PCI_DEVFN(3, 0)) != NULL) &&
-		(pci_read_config8(dev_find_slot(0, PCI_DEVFN(3, 0)), PCI_CLASS_REVISION) != 0xff);
-	int stepping = pci_read_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), PCI_CLASS_REVISION);
+	int me_active = (pcidev_on_root(3, 0) != NULL) &&
+		(pci_read_config8(pcidev_on_root(3, 0), PCI_CLASS_REVISION) !=
+									 0xff);
+	int stepping = pci_read_config8(pcidev_on_root(0, 0),
+							   PCI_CLASS_REVISION);
 
 	unsigned long tmp = current;
 	current += acpi_create_dmar_drhd(current, 0, 0, IOMMU_BASE1);
diff --git a/src/northbridge/intel/gm45/gma.c b/src/northbridge/intel/gm45/gma.c
index 8acec29..0ec0516 100644
--- a/src/northbridge/intel/gm45/gma.c
+++ b/src/northbridge/intel/gm45/gma.c
@@ -815,7 +815,7 @@
 const struct i915_gpu_controller_info *
 intel_gma_get_controller_info(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x2,0));
+	struct device *dev = pcidev_on_root(0x2, 0);
 	if (!dev) {
 		return NULL;
 	}
diff --git a/src/northbridge/intel/gm45/northbridge.c b/src/northbridge/intel/gm45/northbridge.c
index 014de26..7ff046e 100644
--- a/src/northbridge/intel/gm45/northbridge.c
+++ b/src/northbridge/intel/gm45/northbridge.c
@@ -41,7 +41,7 @@
 	*base = 0;
 	*len = 0;
 
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 	if (!dev)
 		return 0;
 
@@ -95,7 +95,7 @@
 
 	pci_domain_read_resources(dev);
 
-	struct device *mch = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *mch = pcidev_on_root(0, 0);
 
 	/* Top of Upper Usable DRAM, including remap */
 	touud = pci_read_config16(mch, D0F0_TOUUD);
@@ -196,7 +196,7 @@
 {
 	u32 reg32;
 
-	struct device *mch = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *mch = pcidev_on_root(0, 0);
 
 	/* Enable SERR */
 	reg32 = pci_read_config32(mch, PCI_COMMAND);
@@ -222,7 +222,7 @@
 
 void northbridge_write_smram(u8 smram)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	if (dev == NULL)
 		die("could not find pci 00:00.0!\n");
@@ -309,7 +309,7 @@
 		}
 		for (; fn >= 0; --fn) {
 			const struct device *const d =
-				dev_find_slot(0, PCI_DEVFN(dev, fn));
+				pcidev_on_root(dev, fn);
 			if (!d || d->enabled) continue;
 			const u32 deven = pci_read_config32(d0f0, D0F0_DEVEN);
 			pci_write_config32(d0f0, D0F0_DEVEN,
diff --git a/src/northbridge/intel/haswell/acpi.c b/src/northbridge/intel/haswell/acpi.c
index a73432a..f655c3b 100644
--- a/src/northbridge/intel/haswell/acpi.c
+++ b/src/northbridge/intel/haswell/acpi.c
@@ -31,7 +31,7 @@
 	int max_buses;
 	u32 mask;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (!dev)
 		return current;
 
@@ -72,7 +72,7 @@
 
 static unsigned long acpi_fill_dmar(unsigned long current)
 {
-	struct device *const igfx_dev = dev_find_slot(0, PCI_DEVFN(2, 0));
+	struct device *const igfx_dev = pcidev_on_root(2, 0);
 	const u32 gfxvtbar = MCHBAR32(GFXVTBAR) & ~0xfff;
 	const u32 vtvc0bar = MCHBAR32(VTVC0BAR) & ~0xfff;
 	const bool gfxvten = MCHBAR32(GFXVTBAR) & 0x1;
diff --git a/src/northbridge/intel/haswell/gma.c b/src/northbridge/intel/haswell/gma.c
index 6e3f452..be83894 100644
--- a/src/northbridge/intel/haswell/gma.c
+++ b/src/northbridge/intel/haswell/gma.c
@@ -512,7 +512,7 @@
 const struct i915_gpu_controller_info *
 intel_gma_get_controller_info(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x2,0));
+	struct device *dev = pcidev_on_root(0x2, 0);
 	if (!dev) {
 		return NULL;
 	}
diff --git a/src/northbridge/intel/haswell/northbridge.c b/src/northbridge/intel/haswell/northbridge.c
index fcdb683..8ae5a4a 100644
--- a/src/northbridge/intel/haswell/northbridge.c
+++ b/src/northbridge/intel/haswell/northbridge.c
@@ -449,7 +449,7 @@
 		{ PCI_DEVFN(7, 0), DEVEN_D7EN, "\"device 7\"" },
 	};
 
-	struct device *host_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *host_dev = pcidev_on_root(0x0, 0);
 	u32 deven;
 	size_t i;
 
diff --git a/src/northbridge/intel/i945/acpi.c b/src/northbridge/intel/i945/acpi.c
index c36044f..053815b 100644
--- a/src/northbridge/intel/i945/acpi.c
+++ b/src/northbridge/intel/i945/acpi.c
@@ -29,7 +29,7 @@
 	u32 pciexbar_reg;
 	int max_buses;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (!dev)
 		return current;
 
diff --git a/src/northbridge/intel/i945/gma.c b/src/northbridge/intel/i945/gma.c
index 749d07b..7a2a489 100644
--- a/src/northbridge/intel/i945/gma.c
+++ b/src/northbridge/intel/i945/gma.c
@@ -73,7 +73,7 @@
 	/*
 	 * The Video BIOS places the GTT right below top of memory.
 	 */
-	tom = pci_read_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), TOLUD) << 24;
+	tom = pci_read_config8(pcidev_on_root(0, 0), TOLUD) << 24;
 	PGETBL_save = tom - 256 * KiB;
 	PGETBL_save |= PGETBL_ENABLED;
 	PGETBL_save |= 2; /* set GTT to 256kb */
@@ -357,7 +357,7 @@
 
 	/* Setup GTT.  */
 
-	reg16 = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0, 0)), GGC);
+	reg16 = pci_read_config16(pcidev_on_root(0, 0), GGC);
 	uma_size = 0;
 	if (!(reg16 & 2)) {
 		uma_size = decode_igd_memory_size((reg16 >> 4) & 7);
@@ -536,7 +536,7 @@
 
 	/* Set up GTT.  */
 
-	reg16 = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0, 0)), GGC);
+	reg16 = pci_read_config16(pcidev_on_root(0, 0), GGC);
 	uma_size = 0;
 	if (!(reg16 & 2)) {
 		uma_size = decode_igd_memory_size((reg16 >> 4) & 7);
@@ -725,7 +725,7 @@
    be re-enabled later. */
 static void gma_func0_disable(struct device *dev)
 {
-	struct device *dev_host = dev_find_slot(0, PCI_DEVFN(0x0, 0));
+	struct device *dev_host = pcidev_on_root(0x0, 0);
 
 	pci_write_config16(dev, GCFC, 0xa00);
 	pci_write_config16(dev_host, GGC, (1 << 1));
@@ -768,7 +768,7 @@
 const struct i915_gpu_controller_info *
 intel_gma_get_controller_info(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x2, 0));
+	struct device *dev = pcidev_on_root(0x2, 0);
 	if (!dev)
 		return NULL;
 	struct northbridge_intel_i945_config *chip = dev->chip_info;
diff --git a/src/northbridge/intel/i945/northbridge.c b/src/northbridge/intel/i945/northbridge.c
index ef3c59c..2b51b5e 100644
--- a/src/northbridge/intel/i945/northbridge.c
+++ b/src/northbridge/intel/i945/northbridge.c
@@ -34,7 +34,7 @@
 
 	*base = 0;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (!dev)
 		return 0;
 
@@ -76,16 +76,16 @@
 	printk(BIOS_DEBUG, "pci_tolm: 0x%x\n", pci_tolm);
 
 	printk(BIOS_SPEW, "Base of stolen memory: 0x%08x\n",
-		    pci_read_config32(dev_find_slot(0, PCI_DEVFN(2, 0)), BSM));
+		    pci_read_config32(pcidev_on_root(2, 0), BSM));
 
-	tolud = pci_read_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), TOLUD);
+	tolud = pci_read_config8(pcidev_on_root(0, 0), TOLUD);
 	printk(BIOS_SPEW, "Top of Low Used DRAM: 0x%08x\n", tolud << 24);
 
 	tomk = tolud << 14;
 	tomk_stolen = tomk;
 
 	/* Note: subtract IGD device and TSEG */
-	reg16 = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0, 0)), GGC);
+	reg16 = pci_read_config16(pcidev_on_root(0, 0), GGC);
 	if (!(reg16 & 2)) {
 		printk(BIOS_DEBUG, "IGD decoded, subtracting ");
 		int uma_size = decode_igd_memory_size((reg16 >> 4) & 7);
@@ -98,8 +98,8 @@
 		uma_memory_size = uma_size * 1024ULL;
 	}
 
-	tseg_sizek = decode_tseg_size(pci_read_config8(dev_find_slot(0,
-					PCI_DEVFN(0, 0)), ESMRAMC)) >> 10;
+	tseg_sizek = decode_tseg_size(pci_read_config8(pcidev_on_root(0, 0),
+							ESMRAMC)) >> 10;
 	printk(BIOS_DEBUG, "TSEG decoded, subtracting %dM\n", tseg_sizek >> 10);
 	tomk_stolen -= tseg_sizek;
 	tseg_memory_base = tomk_stolen * 1024ULL;
@@ -157,7 +157,7 @@
 
 void northbridge_write_smram(u8 smram)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	if (dev == NULL)
 		die("could not find pci 00:00.0!\n");
diff --git a/src/northbridge/intel/i945/raminit.c b/src/northbridge/intel/i945/raminit.c
index 5f06b7d..64c87da 100644
--- a/src/northbridge/intel/i945/raminit.c
+++ b/src/northbridge/intel/i945/raminit.c
@@ -1219,7 +1219,7 @@
 	tom = tolud >> 3;
 
 	/* Limit the value of TOLUD to leave some space for PCI memory. */
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (dev)
 		cfg = dev->chip_info;
 
diff --git a/src/northbridge/intel/nehalem/gma.c b/src/northbridge/intel/nehalem/gma.c
index b89215d..039923c 100644
--- a/src/northbridge/intel/nehalem/gma.c
+++ b/src/northbridge/intel/nehalem/gma.c
@@ -658,7 +658,7 @@
 const struct i915_gpu_controller_info *
 intel_gma_get_controller_info(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x2,0));
+	struct device *dev = pcidev_on_root(0x2, 0);
 	if (!dev) {
 		return NULL;
 	}
diff --git a/src/northbridge/intel/nehalem/northbridge.c b/src/northbridge/intel/nehalem/northbridge.c
index 00f6913..fbe6c11 100644
--- a/src/northbridge/intel/nehalem/northbridge.c
+++ b/src/northbridge/intel/nehalem/northbridge.c
@@ -39,7 +39,7 @@
 	if (bridge_revision_id < 0) {
 		uint8_t stepping = cpuid_eax(1) & 0xf;
 		uint8_t bridge_id =
-		    pci_read_config16(dev_find_slot(0, PCI_DEVFN(0, 0)),
+		    pci_read_config16(pcidev_on_root(0, 0),
 				      PCI_DEVICE_ID) & 0xf0;
 		bridge_revision_id = bridge_id | stepping;
 	}
@@ -129,8 +129,8 @@
 
 	mmconf_resource(dev, 0x50);
 
-	tseg_base = pci_read_config32(dev_find_slot(0, PCI_DEVFN(0, 0)), TSEG);
-	TOUUD = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0, 0)),
+	tseg_base = pci_read_config32(pcidev_on_root(0, 0), TSEG);
+	TOUUD = pci_read_config16(pcidev_on_root(0, 0),
 				  D0F0_TOUUD);
 
 	printk(BIOS_DEBUG, "ram_before_4g_top: 0x%x\n", tseg_base);
@@ -142,7 +142,7 @@
 
 	mmio_resource(dev, 5, tseg_base >> 10, CONFIG_SMM_TSEG_SIZE >> 10);
 
-	reg16 = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0, 0)), D0F0_GGC);
+	reg16 = pci_read_config16(pcidev_on_root(0, 0), D0F0_GGC);
 	const int uma_sizes_gtt[16] =
 	    { 0, 1, 0, 2, 0, 0, 0, 0, 0, 2, 3, 4, 42, 42, 42, 42 };
 	/* Igd memory */
@@ -156,9 +156,9 @@
 	uma_size_gtt = uma_sizes_gtt[(reg16 >> 8) & 0xF];
 
 	igd_base =
-	    pci_read_config32(dev_find_slot(0, PCI_DEVFN(0, 0)), D0F0_IGD_BASE);
+	    pci_read_config32(pcidev_on_root(0, 0), D0F0_IGD_BASE);
 	gtt_base =
-	    pci_read_config32(dev_find_slot(0, PCI_DEVFN(0, 0)), D0F0_GTT_BASE);
+	    pci_read_config32(pcidev_on_root(0, 0), D0F0_GTT_BASE);
 	mmio_resource(dev, 6, gtt_base >> 10, uma_size_gtt << 10);
 	mmio_resource(dev, 7, igd_base >> 10, uma_size_igd << 10);
 
@@ -174,7 +174,7 @@
 
 u32 northbridge_get_tseg_base(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	return pci_read_config32(dev, TSEG) & ~1;
 }
diff --git a/src/northbridge/intel/pineview/early_init.c b/src/northbridge/intel/pineview/early_init.c
index 7f90529..8974428 100644
--- a/src/northbridge/intel/pineview/early_init.c
+++ b/src/northbridge/intel/pineview/early_init.c
@@ -41,7 +41,7 @@
 	u16 reg16;
 	u32 reg32;
 
-	const struct device *d0f0 = dev_find_slot(0, PCI_DEVFN(0,0));
+	const struct device *d0f0 = pcidev_on_root(0, 0);
 	const struct northbridge_intel_pineview_config *config = d0f0->chip_info;
 
 	pci_write_config8(D0F0, DEVEN, BOARD_DEVEN);
diff --git a/src/northbridge/intel/pineview/gma.c b/src/northbridge/intel/pineview/gma.c
index e075ac1..56242ce 100644
--- a/src/northbridge/intel/pineview/gma.c
+++ b/src/northbridge/intel/pineview/gma.c
@@ -72,7 +72,7 @@
 static int gtt_setup(u8 *mmiobase)
 {
 	u32 gttbase;
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0,0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	gttbase = pci_read_config32(dev, BGSM);
 	printk(BIOS_DEBUG, "gttbase = %08x\n", gttbase);
@@ -319,7 +319,7 @@
 
 const struct i915_gpu_controller_info *intel_gma_get_controller_info(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x2,0));
+	struct device *dev = pcidev_on_root(0x2, 0);
 	if (!dev) {
 		printk(BIOS_WARNING, "WARNING: Can't find IGD (0,2,0)\n");
 		return NULL;
diff --git a/src/northbridge/intel/pineview/northbridge.c b/src/northbridge/intel/pineview/northbridge.c
index 33e8089..ee1efd3 100644
--- a/src/northbridge/intel/pineview/northbridge.c
+++ b/src/northbridge/intel/pineview/northbridge.c
@@ -60,7 +60,7 @@
 	u16 index;
 	const u32 top32memk = 4 * (GiB / KiB);
 
-	struct device *mch = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *mch = pcidev_on_root(0, 0);
 
 	index = 3;
 
@@ -143,7 +143,7 @@
 
 void northbridge_write_smram(u8 smram)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	if (dev == NULL)
 		die("could not find pci 00:00.0!\n");
diff --git a/src/northbridge/intel/sandybridge/acpi.c b/src/northbridge/intel/sandybridge/acpi.c
index 0a31c85..c7914a0 100644
--- a/src/northbridge/intel/sandybridge/acpi.c
+++ b/src/northbridge/intel/sandybridge/acpi.c
@@ -29,7 +29,7 @@
 	u32 pciexbar_reg;
 	int max_buses;
 
-	struct device *const dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *const dev = pcidev_on_root(0, 0);
 
 	if (!dev)
 		return current;
@@ -68,7 +68,7 @@
 
 static unsigned long acpi_fill_dmar(unsigned long current)
 {
-	const struct device *const igfx = dev_find_slot(0, PCI_DEVFN(2, 0));
+	const struct device *const igfx = pcidev_on_root(2, 0);
 
 	if (igfx && igfx->enabled) {
 		const unsigned long tmp = current;
diff --git a/src/northbridge/intel/sandybridge/gma.c b/src/northbridge/intel/sandybridge/gma.c
index cd8f7b9..150f78a 100644
--- a/src/northbridge/intel/sandybridge/gma.c
+++ b/src/northbridge/intel/sandybridge/gma.c
@@ -684,7 +684,7 @@
 const struct i915_gpu_controller_info *
 intel_gma_get_controller_info(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x2,0));
+	struct device *dev = pcidev_on_root(0x2, 0);
 	if (!dev) {
 		return NULL;
 	}
@@ -737,7 +737,7 @@
 static void gma_func0_disable(struct device *dev)
 {
 	u16 reg16;
-	struct device *dev_host = dev_find_slot(0, PCI_DEVFN(0,0));
+	struct device *dev_host = pcidev_on_root(0, 0);
 
 	reg16 = pci_read_config16(dev_host, GGC);
 	reg16 |= (1 << 1); /* disable VGA decode */
diff --git a/src/northbridge/intel/sandybridge/gma_ivybridge_lvds.c b/src/northbridge/intel/sandybridge/gma_ivybridge_lvds.c
index 23ecd44..6371c16 100644
--- a/src/northbridge/intel/sandybridge/gma_ivybridge_lvds.c
+++ b/src/northbridge/intel/sandybridge/gma_ivybridge_lvds.c
@@ -504,7 +504,7 @@
 	write32(mmio + 0x0004f05c, 0x00000008);
 
 	/* Linux relies on VBT for panel info.  */
-	generate_fake_intel_oprom(info, dev_find_slot(0, PCI_DEVFN(2, 0)),
+	generate_fake_intel_oprom(info, pcidev_on_root(2, 0),
 				  "$VBT SNB/IVB-MOBILE");
 
 	return 1;
diff --git a/src/northbridge/intel/sandybridge/gma_sandybridge_lvds.c b/src/northbridge/intel/sandybridge/gma_sandybridge_lvds.c
index 5e8c188..977cca8 100644
--- a/src/northbridge/intel/sandybridge/gma_sandybridge_lvds.c
+++ b/src/northbridge/intel/sandybridge/gma_sandybridge_lvds.c
@@ -469,7 +469,7 @@
 	}
 
 	/* Linux relies on VBT for panel info.  */
-	generate_fake_intel_oprom(info, dev_find_slot(0, PCI_DEVFN(2, 0)),
+	generate_fake_intel_oprom(info, pcidev_on_root(2, 0),
 				  "$VBT SNB/IVB-MOBILE");
 
 	return 1;
diff --git a/src/northbridge/intel/sandybridge/iommu.c b/src/northbridge/intel/sandybridge/iommu.c
index 08fbe05..017c732 100644
--- a/src/northbridge/intel/sandybridge/iommu.c
+++ b/src/northbridge/intel/sandybridge/iommu.c
@@ -37,8 +37,7 @@
 	/* lock policies */
 	write32((void *)(IOMMU_BASE1 + 0xff0), 0x80000000);
 
-	const struct device *const azalia =
-		dev_find_slot(0x00, PCI_DEVFN(0x1b, 0));
+	const struct device *const azalia = pcidev_on_root(0x1b, 0);
 	if (azalia && azalia->enabled) {
 		write32((void *)(IOMMU_BASE2 + 0xff0), 0x20000000);
 		write32((void *)(IOMMU_BASE2 + 0xff0), 0xa0000000);
diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c
index 5ec8292..4a8419a 100644
--- a/src/northbridge/intel/sandybridge/northbridge.c
+++ b/src/northbridge/intel/sandybridge/northbridge.c
@@ -42,7 +42,7 @@
 	if (bridge_revision_id < 0) {
 		uint8_t stepping = cpuid_eax(1) & 0xf;
 		uint8_t bridge_id = pci_read_config16(
-			dev_find_slot(0, PCI_DEVFN(0, 0)),
+			pcidev_on_root(0, 0),
 			PCI_DEVICE_ID) & 0xf0;
 		bridge_revision_id = bridge_id | stepping;
 	}
@@ -65,7 +65,7 @@
 
 	*base = 0;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (!dev)
 		return 0;
 
@@ -151,7 +151,7 @@
 	 * 14fe00000   5368MB TOUUD
 	 */
 
-	struct device *mch = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *mch = pcidev_on_root(0, 0);
 
 	/* Top of Upper Usable DRAM, including remap */
 	touud = pci_read_config32(mch, TOUUD+4);
@@ -351,46 +351,46 @@
 	struct device *dev;
 	u32 reg;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	reg = pci_read_config32(dev, DEVEN);
 
-	dev = dev_find_slot(0, PCI_DEVFN(1, 2));
+	dev = pcidev_on_root(1, 2);
 	if (!dev || !dev->enabled) {
 		printk(BIOS_DEBUG, "Disabling PEG12.\n");
 		reg &= ~DEVEN_PEG12;
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(1, 1));
+	dev = pcidev_on_root(1, 1);
 	if (!dev || !dev->enabled) {
 		printk(BIOS_DEBUG, "Disabling PEG11.\n");
 		reg &= ~DEVEN_PEG11;
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(1, 0));
+	dev = pcidev_on_root(1, 0);
 	if (!dev || !dev->enabled) {
 		printk(BIOS_DEBUG, "Disabling PEG10.\n");
 		reg &= ~DEVEN_PEG10;
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(2, 0));
+	dev = pcidev_on_root(2, 0);
 	if (!dev || !dev->enabled) {
 		printk(BIOS_DEBUG, "Disabling IGD.\n");
 		reg &= ~DEVEN_IGD;
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(4, 0));
+	dev = pcidev_on_root(4, 0);
 	if (!dev || !dev->enabled) {
 		printk(BIOS_DEBUG, "Disabling Device 4.\n");
 		reg &= ~DEVEN_D4EN;
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(6, 0));
+	dev = pcidev_on_root(6, 0);
 	if (!dev || !dev->enabled) {
 		printk(BIOS_DEBUG, "Disabling PEG60.\n");
 		reg &= ~DEVEN_PEG60;
 	}
-	dev = dev_find_slot(0, PCI_DEVFN(7, 0));
+	dev = pcidev_on_root(7, 0);
 	if (!dev || !dev->enabled) {
 		printk(BIOS_DEBUG, "Disabling Device 7.\n");
 		reg &= ~DEVEN_D7EN;
 	}
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	pci_write_config32(dev, DEVEN, reg);
 	if (!(reg & (DEVEN_PEG60 | DEVEN_PEG10 | DEVEN_PEG11 | DEVEN_PEG12))) {
 		/* Set the PEG clock gating bit.
@@ -469,7 +469,7 @@
 
 u32 northbridge_get_tseg_base(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	return northbridge_get_base_reg(dev, TSEG);
 }
@@ -481,7 +481,7 @@
 
 void northbridge_write_smram(u8 smram)
 {
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM, smram);
+	pci_write_config8(pcidev_on_root(0, 0), SMRAM, smram);
 }
 
 static struct pci_operations intel_pci_ops = {
diff --git a/src/northbridge/intel/x4x/acpi.c b/src/northbridge/intel/x4x/acpi.c
index 1b016bc..da9ed40 100644
--- a/src/northbridge/intel/x4x/acpi.c
+++ b/src/northbridge/intel/x4x/acpi.c
@@ -30,7 +30,7 @@
 	u32 pciexbar = 0;
 	u32 length = 0;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (!decode_pciebar(&pciexbar, &length))
 		return current;
 
diff --git a/src/northbridge/intel/x4x/gma.c b/src/northbridge/intel/x4x/gma.c
index 1fcc682..680b836 100644
--- a/src/northbridge/intel/x4x/gma.c
+++ b/src/northbridge/intel/x4x/gma.c
@@ -69,10 +69,10 @@
 	pci_write_config32(dev, PCI_COMMAND, reg32);
 
 	/* configure GMBUSFREQ */
-	reg16 = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x2, 0)), 0xcc);
+	reg16 = pci_read_config16(pcidev_on_root(0x2, 0), 0xcc);
 	reg16 &= ~0x1ff;
 	reg16 |= 0xbc;
-	pci_write_config16(dev_find_slot(0, PCI_DEVFN(0x2, 0)), 0xcc, reg16);
+	pci_write_config16(pcidev_on_root(0x2, 0), 0xcc, reg16);
 
 	int vga_disable = (pci_read_config16(dev, D0F0_GGC) & 2) >> 1;
 
@@ -93,7 +93,7 @@
 
 static void gma_func0_disable(struct device *dev)
 {
-	struct device *dev_host = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev_host = pcidev_on_root(0, 0);
 	u16 ggc;
 
 	ggc = pci_read_config16(dev_host, D0F0_GGC);
@@ -117,7 +117,7 @@
 const struct i915_gpu_controller_info *
 intel_gma_get_controller_info(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x2, 0));
+	struct device *dev = pcidev_on_root(0x2, 0);
 	if (!dev)
 		return NULL;
 	struct northbridge_intel_x4x_config *chip = dev->chip_info;
diff --git a/src/northbridge/intel/x4x/northbridge.c b/src/northbridge/intel/x4x/northbridge.c
index ab58c94..7de39d1 100644
--- a/src/northbridge/intel/x4x/northbridge.c
+++ b/src/northbridge/intel/x4x/northbridge.c
@@ -45,7 +45,7 @@
 
 	pci_domain_read_resources(dev);
 
-	struct device *mch = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *mch = pcidev_on_root(0, 0);
 
 	/* Top of Upper Usable DRAM, including remap */
 	touud = pci_read_config16(mch, D0F0_TOUUD);
@@ -174,7 +174,7 @@
 
 void northbridge_write_smram(u8 smram)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *dev = pcidev_on_root(0, 0);
 
 	if (dev == NULL)
 		die("could not find pci 00:00.0!\n");
@@ -266,7 +266,7 @@
 		}
 		for (; fn >= 0; --fn) {
 			const struct device *const d =
-				dev_find_slot(0, PCI_DEVFN(dev, fn));
+				pcidev_on_root(dev, fn);
 			if (!d || d->enabled)
 				continue;
 			const u32 deven = pci_read_config32(d0f0, D0F0_DEVEN);
diff --git a/src/northbridge/via/vx900/chrome9hd.c b/src/northbridge/via/vx900/chrome9hd.c
index 494d78a..8d2cf9c 100644
--- a/src/northbridge/via/vx900/chrome9hd.c
+++ b/src/northbridge/via/vx900/chrome9hd.c
@@ -117,7 +117,7 @@
 	 * Bit[3:0]
 	 * N:  Frame Buffer Size 2^N  MB
 	 */
-	dev = dev_find_slot(0, PCI_DEVFN(0, 3));
+	dev = pcidev_on_root(0, 3);
 	reg8 = pci_read_config8(dev, 0xa1);
 	ret = (u32) ((reg8 & 0x70) >> 4) + 2;
 	reg8 = pci_read_config8(dev, 0x90);
diff --git a/src/soc/amd/stoneyridge/include/soc/pci_devs.h b/src/soc/amd/stoneyridge/include/soc/pci_devs.h
index 5fddc52..038c071 100644
--- a/src/soc/amd/stoneyridge/include/soc/pci_devs.h
+++ b/src/soc/amd/stoneyridge/include/soc/pci_devs.h
@@ -21,7 +21,7 @@
 
 #if !defined(__SIMPLE_DEVICE__)
 #include <device/device.h>
-#define _SOC_DEV(slot, func)	dev_find_slot(0, PCI_DEVFN(slot, func))
+#define _SOC_DEV(slot, func)	pcidev_on_root(slot, func)
 #else
 #include <arch/io.h>
 #define _SOC_DEV(slot, func)	PCI_DEV(0, slot, func)
diff --git a/src/soc/intel/baytrail/pmutil.c b/src/soc/intel/baytrail/pmutil.c
index 06751f1..be870fc 100644
--- a/src/soc/intel/baytrail/pmutil.c
+++ b/src/soc/intel/baytrail/pmutil.c
@@ -43,7 +43,7 @@
 static struct device *get_pcu_dev(void)
 {
 	if (pcu_dev == NULL)
-		pcu_dev = dev_find_slot(0, PCI_DEVFN(PCU_DEV, 0));
+		pcu_dev = pcidev_on_root(PCU_DEV, 0);
 	return pcu_dev;
 }
 #endif
diff --git a/src/soc/intel/baytrail/ramstage.c b/src/soc/intel/baytrail/ramstage.c
index e9925a2..1715198 100644
--- a/src/soc/intel/baytrail/ramstage.c
+++ b/src/soc/intel/baytrail/ramstage.c
@@ -80,7 +80,7 @@
 	struct pattrs *attrs = (struct pattrs *)pattrs_get();
 
 	attrs->cpuid = cpuid_eax(1);
-	dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 	attrs->revid = pci_read_config8(dev, REVID);
 	/* The revision to stepping IDs have two values per metal stepping. */
 	if (attrs->revid >= RID_D_STEPPING_START) {
diff --git a/src/soc/intel/baytrail/romstage/pmc.c b/src/soc/intel/baytrail/romstage/pmc.c
index b47f7df..e77d00d 100644
--- a/src/soc/intel/baytrail/romstage/pmc.c
+++ b/src/soc/intel/baytrail/romstage/pmc.c
@@ -44,7 +44,7 @@
 	const struct soc_intel_baytrail_config *cfg = NULL;
 
 	rid = pci_read_config8(IOSF_PCI_DEV, REVID);
-	dev = dev_find_slot(0, PCI_DEVFN(SOC_DEV, SOC_FUNC));
+	dev = pcidev_on_root(SOC_DEV, SOC_FUNC);
 
 	if (dev)
 		cfg = dev->chip_info;
diff --git a/src/soc/intel/baytrail/spi.c b/src/soc/intel/baytrail/spi.c
index d893816..81e118c 100644
--- a/src/soc/intel/baytrail/spi.c
+++ b/src/soc/intel/baytrail/spi.c
@@ -267,7 +267,7 @@
 #ifdef __SMM__
 	pci_devfn_t dev = PCI_DEV(0, LPC_DEV, LPC_FUNC);
 #else
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 #endif
 	pci_read_config_dword(dev, SBASE, &sbase);
 	sbase &= ~0x1ff;
diff --git a/src/soc/intel/braswell/chip.c b/src/soc/intel/braswell/chip.c
index ccd6c9f..7a63b5b 100644
--- a/src/soc/intel/braswell/chip.c
+++ b/src/soc/intel/braswell/chip.c
@@ -86,7 +86,7 @@
 
 void soc_silicon_init_params(SILICON_INIT_UPD *params)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 	struct soc_intel_braswell_config *config;
 
 	if (!dev) {
@@ -406,7 +406,7 @@
 **/
 int SocStepping(void)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 	u8 revid = pci_read_config8(dev, 0x8);
 
 	switch (revid & B_PCH_LPC_RID_STEPPING_MASK) {
diff --git a/src/soc/intel/braswell/pmutil.c b/src/soc/intel/braswell/pmutil.c
index 85384a61..8dbb4992 100644
--- a/src/soc/intel/braswell/pmutil.c
+++ b/src/soc/intel/braswell/pmutil.c
@@ -44,7 +44,7 @@
 static struct device *get_pcu_dev(void)
 {
 	if (pcu_dev == NULL)
-		pcu_dev = dev_find_slot(0, PCI_DEVFN(PCU_DEV, 0));
+		pcu_dev = pcidev_on_root(PCU_DEV, 0);
 	return pcu_dev;
 }
 #endif /* ENV_SMM */
diff --git a/src/soc/intel/braswell/ramstage.c b/src/soc/intel/braswell/ramstage.c
index a12db80..b8362cd 100644
--- a/src/soc/intel/braswell/ramstage.c
+++ b/src/soc/intel/braswell/ramstage.c
@@ -84,7 +84,7 @@
 	struct pattrs *attrs = (struct pattrs *)pattrs_get();
 
 	attrs->cpuid = cpuid_eax(1);
-	dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 	attrs->revid = pci_read_config8(dev, REVID);
 	/* The revision to stepping IDs have two values per metal stepping. */
     if (attrs->revid >= RID_D_STEPPING_START) {
diff --git a/src/soc/intel/braswell/romstage/romstage.c b/src/soc/intel/braswell/romstage/romstage.c
index 14eaa6b..9b9a0eb 100644
--- a/src/soc/intel/braswell/romstage/romstage.c
+++ b/src/soc/intel/braswell/romstage/romstage.c
@@ -216,7 +216,7 @@
 	const struct soc_intel_braswell_config *config;
 
 	/* Set the parameters for MemoryInit */
-	dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 
 	if (!dev) {
 		printk(BIOS_ERR,
diff --git a/src/soc/intel/braswell/spi.c b/src/soc/intel/braswell/spi.c
index a5f835d5..988832d 100644
--- a/src/soc/intel/braswell/spi.c
+++ b/src/soc/intel/braswell/spi.c
@@ -236,7 +236,7 @@
 #if ENV_SMM
 	pci_devfn_t dev = PCI_DEV(0, LPC_DEV, LPC_FUNC);
 #else
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 #endif
 	if (!dev) {
 		printk(BIOS_ERR, "%s: PCI device not found", __func__);
diff --git a/src/soc/intel/common/block/lpc/lpc_lib.c b/src/soc/intel/common/block/lpc/lpc_lib.c
index 2fe5b39..fb50b74 100644
--- a/src/soc/intel/common/block/lpc/lpc_lib.c
+++ b/src/soc/intel/common/block/lpc/lpc_lib.c
@@ -265,7 +265,7 @@
 {
 	const struct device *dev;
 
-	dev = dev_find_slot(0, PCI_DEVFN(PCH_DEV_SLOT_LPC, 0));
+	dev = pcidev_on_root(PCH_DEV_SLOT_LPC, 0);
 	if (!dev || !dev->chip_info)
 		return;
 
@@ -278,7 +278,7 @@
 	const struct device *dev;
 	uint32_t gen_io_dec[LPC_NUM_GENERIC_IO_RANGES];
 
-	dev = dev_find_slot(0, PCI_DEVFN(PCH_DEV_SLOT_LPC, 0));
+	dev = pcidev_on_root(PCH_DEV_SLOT_LPC, 0);
 	if (!dev || !dev->chip_info)
 		return;
 
diff --git a/src/soc/intel/fsp_baytrail/i2c.c b/src/soc/intel/fsp_baytrail/i2c.c
index 95761f3..22e565f 100644
--- a/src/soc/intel/fsp_baytrail/i2c.c
+++ b/src/soc/intel/fsp_baytrail/i2c.c
@@ -114,7 +114,7 @@
 
 	base_ptr = (char*)base_adr[bus];
 	/* Set the I2C-device the user wants to use */
-	dev = dev_find_slot(0, PCI_DEVFN(I2C1_DEV, bus + 1));
+	dev = pcidev_on_root(I2C1_DEV, bus + 1);
 
 	/* Ensure we have the right PCI device */
 	if ((pci_read_config16(dev, 0x0) != I2C_PCI_VENDOR_ID) ||
@@ -171,7 +171,7 @@
 	int stat;
 
 	/* Get base address of desired I2C-controller */
-	dev = dev_find_slot(0, PCI_DEVFN(I2C1_DEV, bus + 1));
+	dev = pcidev_on_root(I2C1_DEV, bus + 1);
 	base_ptr = (char *)pci_read_config32(dev, PCI_BASE_ADDRESS_0);
 	if (base_ptr == NULL) {
 		printk(BIOS_INFO, "I2C: Invalid Base address\n");
@@ -230,7 +230,7 @@
 	int stat;
 
 	/* Get base address of desired I2C-controller */
-	dev = dev_find_slot(0, PCI_DEVFN(I2C1_DEV, bus + 1));
+	dev = pcidev_on_root(I2C1_DEV, bus + 1);
 	base_ptr = (char *)pci_read_config32(dev, PCI_BASE_ADDRESS_0);
 	if (base_ptr == NULL) {
 		return I2C_ERR_INVALID_ADR;
diff --git a/src/soc/intel/fsp_baytrail/northcluster.c b/src/soc/intel/fsp_baytrail/northcluster.c
index 93cd2f2..416746d 100644
--- a/src/soc/intel/fsp_baytrail/northcluster.c
+++ b/src/soc/intel/fsp_baytrail/northcluster.c
@@ -92,7 +92,7 @@
 
 	*base = 0;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	dev = pcidev_on_root(0, 0);
 	if (!dev)
 		return 0;
 
diff --git a/src/soc/intel/fsp_baytrail/pmutil.c b/src/soc/intel/fsp_baytrail/pmutil.c
index 402842e..6e4a7c8 100644
--- a/src/soc/intel/fsp_baytrail/pmutil.c
+++ b/src/soc/intel/fsp_baytrail/pmutil.c
@@ -41,7 +41,7 @@
 static struct device *get_pcu_dev(void)
 {
 	if (pcu_dev == NULL)
-		pcu_dev = dev_find_slot(0, PCI_DEVFN(PCU_DEV, 0));
+		pcu_dev = pcidev_on_root(PCU_DEV, 0);
 	return pcu_dev;
 }
 #endif
diff --git a/src/soc/intel/fsp_baytrail/ramstage.c b/src/soc/intel/fsp_baytrail/ramstage.c
index f4cdaa8..754c5f5 100644
--- a/src/soc/intel/fsp_baytrail/ramstage.c
+++ b/src/soc/intel/fsp_baytrail/ramstage.c
@@ -78,7 +78,7 @@
 	struct pattrs *attrs = (struct pattrs *)pattrs_get();
 
 	attrs->cpuid = cpuid_eax(1);
-	dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 	attrs->revid = pci_read_config8(dev, REVID);
 	/* The revision to stepping IDs have two values per metal stepping. */
 	if (attrs->revid >= RID_D_STEPPING_START) {
diff --git a/src/soc/intel/fsp_baytrail/spi.c b/src/soc/intel/fsp_baytrail/spi.c
index 4537bcc..41d5150 100644
--- a/src/soc/intel/fsp_baytrail/spi.c
+++ b/src/soc/intel/fsp_baytrail/spi.c
@@ -254,11 +254,9 @@
 	uint32_t sbase;
 
 #ifdef __SMM__
-	pci_devfn_t dev;
-	dev = PCI_DEV(0, LPC_DEV, LPC_FUNC);
+	pci_devfn_t dev = PCI_DEV(0, LPC_DEV, LPC_FUNC);
 #else
-	struct device *dev;
-	dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 #endif
 	pci_read_config_dword(dev, SBASE, &sbase);
 	sbase &= ~0x1ff;
diff --git a/src/soc/intel/fsp_broadwell_de/acpi.c b/src/soc/intel/fsp_broadwell_de/acpi.c
index ad88313..0b07ea8 100644
--- a/src/soc/intel/fsp_broadwell_de/acpi.c
+++ b/src/soc/intel/fsp_broadwell_de/acpi.c
@@ -81,7 +81,7 @@
 {
 	uint8_t actl = 0;
 	static uint8_t sci_irq = 0;
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	struct device *dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 
 	/* If this function was already called, just return the stored value. */
 	if (sci_irq)
diff --git a/src/soc/intel/fsp_broadwell_de/ramstage.c b/src/soc/intel/fsp_broadwell_de/ramstage.c
index 7b94268..492378e 100644
--- a/src/soc/intel/fsp_broadwell_de/ramstage.c
+++ b/src/soc/intel/fsp_broadwell_de/ramstage.c
@@ -62,7 +62,7 @@
 
 	attrs->cpuid = cpuid_eax(1);
 	attrs->stepping = (attrs->cpuid & 0x0F) - 1;
-	dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC));
+	dev = pcidev_on_root(LPC_DEV, LPC_FUNC);
 	attrs->revid = pci_read_config8(dev, REVID);
 	attrs->microcode_patch = intel_microcode_find();
 	attrs->address_bits = cpuid_eax(0x80000008) & 0xff;
diff --git a/src/soc/intel/quark/acpi.c b/src/soc/intel/quark/acpi.c
index 960b53f..83bed34 100644
--- a/src/soc/intel/quark/acpi.c
+++ b/src/soc/intel/quark/acpi.c
@@ -31,9 +31,8 @@
 
 void acpi_fill_in_fadt(acpi_fadt_t *fadt)
 {
-	struct device *dev = dev_find_slot(0,
-		PCI_DEVFN(PCI_DEVICE_NUMBER_QNC_LPC,
-		PCI_FUNCTION_NUMBER_QNC_LPC));
+	struct device *dev = pcidev_on_root(PCI_DEVICE_NUMBER_QNC_LPC,
+			PCI_FUNCTION_NUMBER_QNC_LPC);
 	uint32_t gpe0_base = pci_read_config32(dev, R_QNC_LPC_GPE0BLK)
 		& B_QNC_LPC_GPE0BLK_MASK;
 	uint32_t pmbase = pci_read_config32(dev, R_QNC_LPC_PM1BLK)
diff --git a/src/southbridge/amd/cimx/sb800/spi.c b/src/southbridge/amd/cimx/sb800/spi.c
index 574c062..8cfa24b 100644
--- a/src/southbridge/amd/cimx/sb800/spi.c
+++ b/src/southbridge/amd/cimx/sb800/spi.c
@@ -50,7 +50,7 @@
 {
 	struct device *dev;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0x14, 3));
+	dev = pcidev_on_root(0x14, 3);
 	spibar = pci_read_config32(dev, 0xA0) & ~0x1F;
 }
 
diff --git a/src/southbridge/amd/rs780/cmn.c b/src/southbridge/amd/rs780/cmn.c
index 16270d6..2ef9cd6 100644
--- a/src/southbridge/amd/rs780/cmn.c
+++ b/src/southbridge/amd/rs780/cmn.c
@@ -192,8 +192,8 @@
 void ProgK8TempMmioBase(u8 in_out, u32 pcie_base_add, u32 mmio_base_add)
 {
 	/* K8 Function1 is address map */
-	struct device *k8_f1 = dev_find_slot(0, PCI_DEVFN(0x18, 1));
-	struct device *k8_f0 = dev_find_slot(0, PCI_DEVFN(0x18, 0));
+	struct device *k8_f1 = pcidev_on_root(0x18, 1);
+	struct device *k8_f0 = pcidev_on_root(0x18, 0);
 
 	if (in_out) {
 		u32 dword, sblk;
diff --git a/src/southbridge/amd/rs780/gfx.c b/src/southbridge/amd/rs780/gfx.c
index 575a340..8431223 100644
--- a/src/southbridge/amd/rs780/gfx.c
+++ b/src/southbridge/amd/rs780/gfx.c
@@ -175,7 +175,7 @@
 	CIM_STATUS Status = CIM_UNSUPPORTED;
 	u8 Bus, Dev, Reg, BusStart, BusEnd;
 	u32	Value;
-	struct device *dev0x14 = dev_find_slot(0, PCI_DEVFN(0x14, 4));
+	struct device *dev0x14 = pcidev_on_root(0x14, 4);
 	struct device *tempdev;
 	Value = pci_read_config32(dev0x14, 0x18);
 	BusStart = (Value >> 8) & 0xFF;
@@ -235,7 +235,7 @@
 	int i, j, n = 7;
 	struct device *k8_f1;
 
-	k8_f1 = dev_find_slot(0, PCI_DEVFN(0x18, 1));
+	k8_f1 = pcidev_on_root(0x18, 1);
 
 	for (i = 0; i < 8; i++) {
 		int k = 0, MmioReg;
@@ -787,7 +787,7 @@
 
 	/* LPC DMA Deadlock workaround? */
 	/* GFX_InitCommon*/
-	struct device *k8_f0 = dev_find_slot(0, PCI_DEVFN(0x18, 0));
+	struct device *k8_f0 = pcidev_on_root(0x18, 0);
 	l_dword = pci_read_config32(k8_f0, 0x68);
 	l_dword &= ~(3 << 21);
 	l_dword |= (1 << 21);
@@ -802,9 +802,9 @@
 #if IS_ENABLED(CONFIG_GFXUMA)
 	/* GFX_InitUMA. */
 	/* Copy CPU DDR Controller to NB MC. */
-	struct device *k8_f1 = dev_find_slot(0, PCI_DEVFN(0x18, 1));
-	struct device *k8_f2 = dev_find_slot(0, PCI_DEVFN(0x18, 2));
-	struct device *k8_f4 = dev_find_slot(0, PCI_DEVFN(0x18, 4));
+	struct device *k8_f1 = pcidev_on_root(0x18, 1);
+	struct device *k8_f2 = pcidev_on_root(0x18, 2);
+	struct device *k8_f4 = pcidev_on_root(0x18, 4);
 	for (i = 0; i < 12; i++) {
 		l_dword = pci_read_config32(k8_f2, 0x40 + i * 4);
 		nbmc_write_index(nb_dev, 0x30 + i, l_dword);
@@ -1145,7 +1145,7 @@
 	while (reg32 & 0x100);
 
 	/* step 5.9.1.6 */
-	sb_dev = dev_find_slot(0, PCI_DEVFN(8, 0));
+	sb_dev = pcidev_on_root(8, 0);
 	do {
 		reg32 = pci_ext_read_config32(nb_dev, sb_dev,
 					  PCIE_VC0_RESOURCE_STATUS);
diff --git a/src/southbridge/amd/rs780/ht.c b/src/southbridge/amd/rs780/ht.c
index 43fb899..94df233 100644
--- a/src/southbridge/amd/rs780/ht.c
+++ b/src/southbridge/amd/rs780/ht.c
@@ -26,7 +26,7 @@
 	struct device *cpu_f0;
 	u8 reg;
 
-	cpu_f0 = dev_find_slot(0, PCI_DEVFN(0x18, 0));
+	cpu_f0 = pcidev_on_root(0x18, 0);
 	set_nbcfg_enable_bits(cpu_f0, 0x68, 3 << 21, 1 << 21);
 
 	reg = nbpcie_p_read_index(sb_dev, 0x10);
diff --git a/src/southbridge/amd/rs780/rs780.c b/src/southbridge/amd/rs780/rs780.c
index a753da7..c5e38c1 100644
--- a/src/southbridge/amd/rs780/rs780.c
+++ b/src/southbridge/amd/rs780/rs780.c
@@ -271,14 +271,14 @@
 
 	printk(BIOS_INFO, "rs780_enable: dev=%p, VID_DID=0x%x\n", dev, get_vid_did(dev));
 
-	nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	nb_dev = pcidev_on_root(0, 0);
 	if (!nb_dev) {
 		die("rs780_enable: CAN NOT FIND RS780 DEVICE, HALT!\n");
 		/* NOT REACHED */
 	}
 
 	/* sb_dev (dev 8) is a bridge that links to southbridge. */
-	sb_dev = dev_find_slot(0, PCI_DEVFN(8, 0));
+	sb_dev = pcidev_on_root(8, 0);
 	if (!sb_dev) {
 		die("rs780_enable: CAN NOT FIND SB bridge, HALT!\n");
 		/* NOT REACHED */
diff --git a/src/southbridge/amd/sb700/ide.c b/src/southbridge/amd/sb700/ide.c
index d08f2f1..6734643 100644
--- a/src/southbridge/amd/sb700/ide.c
+++ b/src/southbridge/amd/sb700/ide.c
@@ -56,7 +56,7 @@
 		/* set ide as primary, if you want to boot from IDE, you'd better set it
 		 * in $vendor/$mainboard/devicetree.cb */
 		if (conf->boot_switch_sata_ide == 1) {
-			struct device *sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+			struct device *sm_dev = pcidev_on_root(0x14, 0);
 			byte = pci_read_config8(sm_dev, 0xad);
 			byte |= 1 << 4;
 			pci_write_config8(sm_dev, 0xad, byte);
diff --git a/src/southbridge/amd/sb700/lpc.c b/src/southbridge/amd/sb700/lpc.c
index 857503a..eb0af0d 100644
--- a/src/southbridge/amd/sb700/lpc.c
+++ b/src/southbridge/amd/sb700/lpc.c
@@ -40,7 +40,7 @@
 	printk(BIOS_SPEW, "%s\n", __func__);
 
 	/* Enable the LPC Controller */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	dword = pci_read_config32(sm_dev, 0x64);
 	dword |= 1 << 20;
 	pci_write_config32(sm_dev, 0x64, dword);
diff --git a/src/southbridge/amd/sb700/sata.c b/src/southbridge/amd/sb700/sata.c
index 975e5ac..f1c05f6 100644
--- a/src/southbridge/amd/sb700/sata.c
+++ b/src/southbridge/amd/sb700/sata.c
@@ -134,7 +134,7 @@
 
 	struct device *sm_dev;
 	/* SATA SMBus Disable */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/* WARNING
 	 * Enabling the SATA link latency enhancement (SMBUS 0xAD bit 5)
@@ -171,7 +171,7 @@
 
 	struct device *ide_dev;
 	/* IDE Device */
-	ide_dev = dev_find_slot(0, PCI_DEVFN(0x14, 1));
+	ide_dev = pcidev_on_root(0x14, 1);
 
 	/* Disable legacy IDE mode (enable PATA_BAR0/2) */
 	byte = pci_read_config8(ide_dev, 0x09);
diff --git a/src/southbridge/amd/sb700/spi.c b/src/southbridge/amd/sb700/spi.c
index 1fa29aa..8dc142d 100644
--- a/src/southbridge/amd/sb700/spi.c
+++ b/src/southbridge/amd/sb700/spi.c
@@ -31,7 +31,7 @@
 {
 	struct device *dev;
 
-	dev = dev_find_slot(0, PCI_DEVFN(0x14, 3));
+	dev = pcidev_on_root(0x14, 3);
 	return pci_read_config32(dev, 0xa0) & ~0x1f;
 }
 
diff --git a/src/southbridge/amd/sb700/usb.c b/src/southbridge/amd/sb700/usb.c
index bf79056..3ca12f6 100644
--- a/src/southbridge/amd/sb700/usb.c
+++ b/src/southbridge/amd/sb700/usb.c
@@ -35,7 +35,7 @@
 
 	/* 6.1 Enable OHCI0-4 and EHCI Controllers */
 	struct device *sm_dev;
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	byte = pci_read_config8(sm_dev, 0x68);
 	byte |= 0xFF;
 	pci_write_config8(sm_dev, 0x68, byte);
@@ -88,7 +88,7 @@
 	if (get_option(&nvram, "ehci_async_data_cache") == CB_SUCCESS)
 		ehci_async_data_cache = !!nvram;
 
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	rev = get_sb700_revision(sm_dev);
 
 	/* dword = pci_read_config32(dev, 0xf8); */
diff --git a/src/southbridge/amd/sb800/lpc.c b/src/southbridge/amd/sb800/lpc.c
index 3bbf823..e67dcd7 100644
--- a/src/southbridge/amd/sb800/lpc.c
+++ b/src/southbridge/amd/sb800/lpc.c
@@ -35,7 +35,7 @@
 	struct device *sm_dev;
 
 	/* Enable the LPC Controller */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	dword = pci_read_config32(sm_dev, 0x64);
 	dword |= 1 << 20;
 	pci_write_config32(sm_dev, 0x64, dword);
diff --git a/src/southbridge/amd/sb800/sata.c b/src/southbridge/amd/sb800/sata.c
index 2186d37..acb899f 100644
--- a/src/southbridge/amd/sb800/sata.c
+++ b/src/southbridge/amd/sb800/sata.c
@@ -88,7 +88,7 @@
 	struct device *sm_dev;
 	/* SATA SMBus Disable */
 	/* sm_dev = pci_locate_device(PCI_ID(0x1002, 0x4385), 0); */
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 
 	/* get rev_id */
 	rev_id = pci_read_config8(sm_dev, 0x08) - 0x2F;
diff --git a/src/southbridge/amd/sb800/usb.c b/src/southbridge/amd/sb800/usb.c
index 715095f..9850014 100644
--- a/src/southbridge/amd/sb800/usb.c
+++ b/src/southbridge/amd/sb800/usb.c
@@ -57,7 +57,7 @@
 	void *usb2_bar0;
 	struct device *sm_dev;
 
-	sm_dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
+	sm_dev = pcidev_on_root(0x14, 0);
 	//rev = get_sb800_revision(sm_dev);
 
 	/* dword = pci_read_config32(dev, 0xf8); */
diff --git a/src/southbridge/amd/sr5650/ht.c b/src/southbridge/amd/sr5650/ht.c
index 1b4c99b..f8db2b8 100644
--- a/src/southbridge/amd/sr5650/ht.c
+++ b/src/southbridge/amd/sr5650/ht.c
@@ -187,8 +187,8 @@
 		printk(BIOS_DEBUG,"%s %s\n", dev_path(dev), __func__);
 
 		/* Find requisite AMD CPU devices */
-		amd_ht_cfg_dev = dev_find_slot(0, PCI_DEVFN(0x18, 0));
-		amd_addr_map_dev = dev_find_slot(0, PCI_DEVFN(0x18, 1));
+		amd_ht_cfg_dev = pcidev_on_root(0x18, 0);
+		amd_addr_map_dev = pcidev_on_root(0x18, 1);
 
 		if (!amd_ht_cfg_dev || !amd_addr_map_dev) {
 			printk(BIOS_WARNING, "%s: %s Unable to locate CPU control devices\n", __func__, dev_path(dev));
diff --git a/src/southbridge/amd/sr5650/pcie.c b/src/southbridge/amd/sr5650/pcie.c
index 5084a12..9d4c689 100644
--- a/src/southbridge/amd/sr5650/pcie.c
+++ b/src/southbridge/amd/sr5650/pcie.c
@@ -843,7 +843,7 @@
  */
 void sr56x0_lock_hwinitreg(void)
 {
-	struct device *nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *nb_dev = pcidev_on_root(0, 0);
 
 	/* Lock HWInit Register */
 	lock_hwinitreg(nb_dev);
diff --git a/src/southbridge/amd/sr5650/sr5650.c b/src/southbridge/amd/sr5650/sr5650.c
index 0f8b265..119e4f3 100644
--- a/src/southbridge/amd/sr5650/sr5650.c
+++ b/src/southbridge/amd/sr5650/sr5650.c
@@ -129,8 +129,8 @@
 void ProgK8TempMmioBase(u8 in_out, u32 pcie_base_add, u32 mmio_base_add)
 {
 	/* K8 Function1 is address map */
-	struct device *k8_f1 = dev_find_slot(0, PCI_DEVFN(0x18, 1));
-	struct device *k8_f0 = dev_find_slot(0, PCI_DEVFN(0x18, 0));
+	struct device *k8_f1 = pcidev_on_root(0x18, 1);
+	struct device *k8_f0 = pcidev_on_root(0x18, 0);
 
 	if (in_out) {
 		u32 dword, sblk;
@@ -331,7 +331,7 @@
 	if (iommu) {
 		printk(BIOS_DEBUG, "Initializing IOMMU\n");
 
-		struct device *nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+		struct device *nb_dev = pcidev_on_root(0, 0);
 
 		if (!nb_dev) {
 			printk(BIOS_WARNING, "Unable to find SR5690 device!  IOMMU NOT initialized\n");
@@ -616,7 +616,7 @@
 	struct southbridge_amd_sr5650_config *cfg;
 
 	printk(BIOS_INFO, "sr5650_enable: dev=%p, VID_DID=0x%x\n", dev, get_vid_did(dev));
-	nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	nb_dev = pcidev_on_root(0, 0);
 	if (!nb_dev) {
 		die("sr5650_enable: CAN NOT FIND SR5650 DEVICE, HALT!\n");
 		/* NOT REACHED */
@@ -624,7 +624,7 @@
 	cfg = (struct southbridge_amd_sr5650_config *)nb_dev->chip_info;
 
 	/* sb_dev (dev 8) is a bridge that links to southbridge. */
-	sb_dev = dev_find_slot(0, PCI_DEVFN(8, 0));
+	sb_dev = pcidev_on_root(8, 0);
 	if (!sb_dev) {
 		die("sr5650_enable: CAN NOT FIND SB bridge, HALT!\n");
 		/* NOT REACHED */
@@ -823,14 +823,14 @@
 {
 	uint8_t *p;
 
-	struct device *nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+	struct device *nb_dev = pcidev_on_root(0, 0);
 	if (!nb_dev) {
 		printk(BIOS_WARNING, "acpi_fill_ivrs: Unable to locate SR5650 "
 				"device!  IVRS table not generated...\n");
 		return (unsigned long)ivrs;
 	}
 
-	struct device *iommu_dev = dev_find_slot(0, PCI_DEVFN(0, 2));
+	struct device *iommu_dev = pcidev_on_root(0, 2);
 	if (!iommu_dev) {
 		printk(BIOS_WARNING, "acpi_fill_ivrs: Unable to locate SR5650 "
 				"IOMMU device!  IVRS table not generated...\n");
diff --git a/src/southbridge/intel/bd82x6x/elog.c b/src/southbridge/intel/bd82x6x/elog.c
index 2ccdf83..ef345ef 100644
--- a/src/southbridge/intel/bd82x6x/elog.c
+++ b/src/southbridge/intel/bd82x6x/elog.c
@@ -30,7 +30,7 @@
 	u32 gpe0_sts, gpe0_en;
 	u8 gen_pmcon_2;
 	int i;
-	struct device *lpc = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *lpc = pcidev_on_root(0x1f, 0);
 	if (!lpc)
 		return;
 
diff --git a/src/southbridge/intel/bd82x6x/lpc.c b/src/southbridge/intel/bd82x6x/lpc.c
index 7ae538e..d3da239 100644
--- a/src/southbridge/intel/bd82x6x/lpc.c
+++ b/src/southbridge/intel/bd82x6x/lpc.c
@@ -738,7 +738,7 @@
 
 void acpi_fill_fadt(acpi_fadt_t *fadt)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 	u16 pmbase = pci_read_config16(dev, 0x40) & 0xfffe;
 	int c2_latency;
@@ -875,7 +875,7 @@
 
 static void southbridge_fill_ssdt(struct device *device)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 
 	intel_acpi_pcie_hotplug_generator(chip->pcie_hotplug_map, 8);
diff --git a/src/southbridge/intel/bd82x6x/pch.c b/src/southbridge/intel/bd82x6x/pch.c
index 00265d0..1a646b1 100644
--- a/src/southbridge/intel/bd82x6x/pch.c
+++ b/src/southbridge/intel/bd82x6x/pch.c
@@ -32,11 +32,9 @@
 	static int pch_revision_id = -1;
 
 #ifdef __SIMPLE_DEVICE__
-	pci_devfn_t dev;
-	dev = PCI_DEV(0, 0x1f, 0);
+	pci_devfn_t dev = PCI_DEV(0, 0x1f, 0);
 #else
-	struct device *dev;
-	dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 #endif
 
 	if (pch_revision_id < 0)
@@ -49,11 +47,9 @@
 	static int pch_type = -1;
 
 #ifdef __SIMPLE_DEVICE__
-	pci_devfn_t dev;
-	dev = PCI_DEV(0, 0x1f, 0);
+	pci_devfn_t dev = PCI_DEV(0, 0x1f, 0);
 #else
-	struct device *dev;
-	dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 #endif
 
 	if (pch_type < 0)
diff --git a/src/southbridge/intel/bd82x6x/watchdog.c b/src/southbridge/intel/bd82x6x/watchdog.c
index eb4d38c..c186f35 100644
--- a/src/southbridge/intel/bd82x6x/watchdog.c
+++ b/src/southbridge/intel/bd82x6x/watchdog.c
@@ -34,7 +34,7 @@
 	struct device *dev;
 
 	/* Get LPC device. */
-	dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	dev = pcidev_on_root(0x1f, 0);
 
 	/* Disable interrupt. */
 	value = pci_read_config16(dev, PCI_COMMAND);
diff --git a/src/southbridge/intel/common/acpi_pirq_gen.c b/src/southbridge/intel/common/acpi_pirq_gen.c
index 1f1a2ab..6f28bc6 100644
--- a/src/southbridge/intel/common/acpi_pirq_gen.c
+++ b/src/southbridge/intel/common/acpi_pirq_gen.c
@@ -32,7 +32,7 @@
 	struct device *dev;
 	int num_devs = 0;
 
-	for (dev = dev_find_slot(0, PCI_DEVFN(0, 0)); dev; dev = dev->sibling) {
+	for (dev = pcidev_on_root(0, 0); dev; dev = dev->sibling) {
 		u8 pci_dev;
 		u8 int_pin;
 
diff --git a/src/southbridge/intel/common/gpio.c b/src/southbridge/intel/common/gpio.c
index 7c8cfe8..30c5028 100644
--- a/src/southbridge/intel/common/gpio.c
+++ b/src/southbridge/intel/common/gpio.c
@@ -31,7 +31,7 @@
 #if defined(__SIMPLE_DEVICE__)
 #define PCH_LPC_DEV	PCI_DEV(0, 0x1f, 0)
 #else
-#define PCH_LPC_DEV	dev_find_slot(0, PCI_DEVFN(0x1f, 0))
+#define PCH_LPC_DEV	pcidev_on_root(0x1f, 0)
 #endif
 
 static u16 get_gpio_base(void)
diff --git a/src/southbridge/intel/common/pmbase.c b/src/southbridge/intel/common/pmbase.c
index 2de57d6..8b3274f 100644
--- a/src/southbridge/intel/common/pmbase.c
+++ b/src/southbridge/intel/common/pmbase.c
@@ -33,7 +33,7 @@
 #if defined(__SIMPLE_DEVICE__)
 #define PCH_LPC_DEV	PCI_DEV(0, 0x1f, 0)
 #else
-#define PCH_LPC_DEV	dev_find_slot(0, PCI_DEVFN(0x1f, 0))
+#define PCH_LPC_DEV	pcidev_on_root(0x1f, 0)
 #endif
 
 u16 lpc_get_pmbase(void)
diff --git a/src/southbridge/intel/common/rtc.c b/src/southbridge/intel/common/rtc.c
index e9ac2c2..1f0abeb 100644
--- a/src/southbridge/intel/common/rtc.c
+++ b/src/southbridge/intel/common/rtc.c
@@ -27,7 +27,7 @@
 #if defined(__SIMPLE_DEVICE__)
 #define PCH_LPC_DEV	PCI_DEV(0, 0x1f, 0)
 #else
-#define PCH_LPC_DEV	dev_find_slot(0, PCI_DEVFN(0x1f, 0))
+#define PCH_LPC_DEV	pcidev_on_root(0x1f, 0)
 #endif
 
 int rtc_failure(void)
diff --git a/src/southbridge/intel/common/spi.c b/src/southbridge/intel/common/spi.c
index 3ca0d6c..9bc3414 100644
--- a/src/southbridge/intel/common/spi.c
+++ b/src/southbridge/intel/common/spi.c
@@ -306,7 +306,7 @@
 #ifdef __SIMPLE_DEVICE__
 	pci_devfn_t dev = PCI_DEV(0, 31, 0);
 #else
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(31, 0));
+	struct device *dev = pcidev_on_root(31, 0);
 #endif
 
 	pci_read_config_dword(dev, 0xf0, &rcba);
diff --git a/src/southbridge/intel/fsp_rangeley/soc.c b/src/southbridge/intel/fsp_rangeley/soc.c
index 13b64c4..fd83342 100644
--- a/src/southbridge/intel/fsp_rangeley/soc.c
+++ b/src/southbridge/intel/fsp_rangeley/soc.c
@@ -29,7 +29,7 @@
 {
 	if (soc_revision_id < 0)
 		soc_revision_id = pci_read_config8(
-			dev_find_slot(0, PCI_DEVFN(0x1f, 0)),
+			pcidev_on_root(0x1f, 0),
 			PCI_REVISION_ID);
 	return soc_revision_id;
 }
@@ -38,7 +38,7 @@
 {
 	if (soc_type < 0)
 		soc_type = pci_read_config8(
-			dev_find_slot(0, PCI_DEVFN(0x1f, 0)),
+			pcidev_on_root(0x1f, 0),
 			PCI_DEVICE_ID + 1);
 	return soc_type;
 }
diff --git a/src/southbridge/intel/fsp_rangeley/spi.c b/src/southbridge/intel/fsp_rangeley/spi.c
index 9754806..1571925 100644
--- a/src/southbridge/intel/fsp_rangeley/spi.c
+++ b/src/southbridge/intel/fsp_rangeley/spi.c
@@ -341,14 +341,13 @@
 {
 	int ich_version = 0;
 	uint8_t bios_cntl;
-	struct device *dev;
 	uint32_t ids;
 	uint16_t vendor_id, device_id;
 
 #ifdef __SMM__
-	dev = PCI_DEV(0, 31, 0);
+	pci_devfn_t dev = PCI_DEV(0, 31, 0);
 #else
-	dev = dev_find_slot(0, PCI_DEVFN(31, 0));
+	struct device *dev = pcidev_on_root(31, 0);
 #endif
 	pci_read_config_dword(dev, 0, &ids);
 	vendor_id = ids;
diff --git a/src/southbridge/intel/fsp_rangeley/watchdog.c b/src/southbridge/intel/fsp_rangeley/watchdog.c
index ff1c571..d7d3141 100644
--- a/src/southbridge/intel/fsp_rangeley/watchdog.c
+++ b/src/southbridge/intel/fsp_rangeley/watchdog.c
@@ -29,7 +29,7 @@
 	u32 value, abase;
 
 	/* Turn off the watchdog. */
-	dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	dev = pcidev_on_root(0x1f, 0);
 
 	/* Enable I/O space. */
 	value = pci_read_config16(dev, 0x04);
diff --git a/src/southbridge/intel/i82801dx/smi.c b/src/southbridge/intel/i82801dx/smi.c
index 0ff813e..bdea66f 100644
--- a/src/southbridge/intel/i82801dx/smi.c
+++ b/src/southbridge/intel/i82801dx/smi.c
@@ -238,7 +238,7 @@
 
 	printk(BIOS_DEBUG, "Initializing SMM handler...");
 
-	pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), 0x40) & 0xfffc;
+	pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), 0x40) & 0xfffc;
 	printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", pmbase);
 
 	smi_en = inl(pmbase + SMI_EN);
@@ -317,7 +317,7 @@
 static void smm_install(void)
 {
 	/* enable the SMM memory window */
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
+	pci_write_config8(pcidev_on_root(0, 0), SMRAM,
 				D_OPEN | G_SMRAME | C_BASE_SEG);
 
 	/* copy the real SMM handler */
@@ -326,7 +326,7 @@
 	wbinvd();
 
 	/* close the SMM memory window and enable normal SMM */
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
+	pci_write_config8(pcidev_on_root(0, 0), SMRAM,
 			G_SMRAME | C_BASE_SEG);
 }
 
@@ -354,7 +354,7 @@
 	 * make the SMM registers writable again.
 	 */
 	printk(BIOS_DEBUG, "Locking SMM.\n");
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
+	pci_write_config8(pcidev_on_root(0, 0), SMRAM,
 			D_LCK | G_SMRAME | C_BASE_SEG);
 }
 
diff --git a/src/southbridge/intel/i82801gx/lpc.c b/src/southbridge/intel/i82801gx/lpc.c
index 7dcec50..c16b8a6 100644
--- a/src/southbridge/intel/i82801gx/lpc.c
+++ b/src/southbridge/intel/i82801gx/lpc.c
@@ -487,7 +487,7 @@
 
 void acpi_fill_fadt(acpi_fadt_t *fadt)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 	u16 pmbase = pci_read_config16(dev, 0x40) & 0xfffe;
 
diff --git a/src/southbridge/intel/i82801gx/sata.c b/src/southbridge/intel/i82801gx/sata.c
index 588d687..567c1e5 100644
--- a/src/southbridge/intel/i82801gx/sata.c
+++ b/src/southbridge/intel/i82801gx/sata.c
@@ -28,7 +28,7 @@
 {
 	struct device *lpc;
 
-	lpc = dev_find_slot(0, PCI_DEVFN(31, 0));
+	lpc = pcidev_on_root(31, 0);
 
 	switch (pci_read_config16(lpc, PCI_DEVICE_ID)) {
 	case 0x27b0:
diff --git a/src/southbridge/intel/i82801gx/watchdog.c b/src/southbridge/intel/i82801gx/watchdog.c
index ac2de3a..ff4da64 100644
--- a/src/southbridge/intel/i82801gx/watchdog.c
+++ b/src/southbridge/intel/i82801gx/watchdog.c
@@ -26,7 +26,7 @@
 	unsigned long value, base;
 
 	/* Turn off the ICH7 watchdog. */
-	dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	dev = pcidev_on_root(0x1f, 0);
 
 	/* Enable I/O space. */
 	value = pci_read_config16(dev, 0x04);
diff --git a/src/southbridge/intel/i82801ix/i82801ix.c b/src/southbridge/intel/i82801ix/i82801ix.c
index 797856e..46838fc 100644
--- a/src/southbridge/intel/i82801ix/i82801ix.c
+++ b/src/southbridge/intel/i82801ix/i82801ix.c
@@ -58,7 +58,7 @@
 
 	/* PCIe - BIOS must program... */
 	for (i = 0; i < 6; ++i) {
-		pciePort[i] = dev_find_slot(0, PCI_DEVFN(0x1c, i));
+		pciePort[i] = pcidev_on_root(0x1c, i);
 		if (!pciePort[i]) {
 			printk(BIOS_EMERG, "PCIe port 00:1c.%x", i);
 			die(" is not listed in devicetree.\n");
@@ -68,7 +68,7 @@
 		pci_write_config8(pciePort[i], 0x324, 0x40);
 	}
 
-	if (LPC_IS_MOBILE(dev_find_slot(0, PCI_DEVFN(0x1f, 0)))) {
+	if (LPC_IS_MOBILE(pcidev_on_root(0x1f, 0))) {
 		for (i = 0; i < 6; ++i) {
 			if (pciePort[i]->enabled) {
 				reg32 = pci_read_config32(pciePort[i], 0xe8);
@@ -116,10 +116,10 @@
 
 static void i82801ix_ehci_init(void)
 {
-	struct device *const pciEHCI1 = dev_find_slot(0, PCI_DEVFN(0x1d, 7));
+	struct device *const pciEHCI1 = pcidev_on_root(0x1d, 7);
 	if (!pciEHCI1)
 		die("EHCI controller (00:1d.7) not listed in devicetree.\n");
-	struct device *const pciEHCI2 = dev_find_slot(0, PCI_DEVFN(0x1a, 7));
+	struct device *const pciEHCI2 = pcidev_on_root(0x1a, 7);
 	if (!pciEHCI2)
 		die("EHCI controller (00:1a.7) not listed in devicetree.\n");
 
diff --git a/src/southbridge/intel/i82801ix/lpc.c b/src/southbridge/intel/i82801ix/lpc.c
index 474c484..b809a4e 100644
--- a/src/southbridge/intel/i82801ix/lpc.c
+++ b/src/southbridge/intel/i82801ix/lpc.c
@@ -566,7 +566,7 @@
 
 static void southbridge_fill_ssdt(struct device *device)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f,0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 
 	intel_acpi_pcie_hotplug_generator(chip->pcie_hotplug_map, 8);
diff --git a/src/southbridge/intel/i82801ix/sata.c b/src/southbridge/intel/i82801ix/sata.c
index e35babc..e3b7e14 100644
--- a/src/southbridge/intel/i82801ix/sata.c
+++ b/src/southbridge/intel/i82801ix/sata.c
@@ -213,8 +213,7 @@
 	pci_write_config32(dev, 0x94, sclkcg);
 
 	if (is_mobile && config->sata_traffic_monitor) {
-		struct device *const lpc_dev = dev_find_slot(0,
-							    PCI_DEVFN(0x1f, 0));
+		struct device *const lpc_dev = pcidev_on_root(0x1f, 0);
 		if (((pci_read_config8(lpc_dev, D31F0_CxSTATE_CNF)
 							>> 3) & 3) == 3) {
 			u8 reg8 = pci_read_config8(dev, 0x9c);
diff --git a/src/southbridge/intel/i82801ix/smi.c b/src/southbridge/intel/i82801ix/smi.c
index 9dc9a3b..74fa495 100644
--- a/src/southbridge/intel/i82801ix/smi.c
+++ b/src/southbridge/intel/i82801ix/smi.c
@@ -50,7 +50,8 @@
 
 	printk(BIOS_DEBUG, "Initializing SMM handler...");
 
-	pmbase = pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f, 0)), D31F0_PMBASE) & 0xfffc;
+	pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), D31F0_PMBASE) &
+									0xfffc;
 	printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", pmbase);
 
 	smi_en = inl(pmbase + SMI_EN);
@@ -138,7 +139,7 @@
 
 	if (!acpi_is_wakeup_s3()) {
 		/* enable the SMM memory window */
-		pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
+		pci_write_config8(pcidev_on_root(0, 0), SMRAM,
 					D_OPEN | G_SMRAME | C_BASE_SEG);
 
 		/* copy the real SMM handler */
@@ -148,7 +149,7 @@
 	}
 
 	/* close the SMM memory window and enable normal SMM */
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
+	pci_write_config8(pcidev_on_root(0, 0), SMRAM,
 			G_SMRAME | C_BASE_SEG);
 }
 
@@ -176,6 +177,6 @@
 	 * make the SMM registers writable again.
 	 */
 	printk(BIOS_DEBUG, "Locking SMM.\n");
-	pci_write_config8(dev_find_slot(0, PCI_DEVFN(0, 0)), SMRAM,
+	pci_write_config8(pcidev_on_root(0, 0), SMRAM,
 			D_LCK | G_SMRAME | C_BASE_SEG);
 }
diff --git a/src/southbridge/intel/i82801ix/thermal.c b/src/southbridge/intel/i82801ix/thermal.c
index 5f40d2e..9311982 100644
--- a/src/southbridge/intel/i82801ix/thermal.c
+++ b/src/southbridge/intel/i82801ix/thermal.c
@@ -24,7 +24,7 @@
 
 static void thermal_init(struct device *dev)
 {
-	if (LPC_IS_MOBILE(dev_find_slot(0, PCI_DEVFN(0x1f, 0))))
+	if (LPC_IS_MOBILE(pcidev_on_root(0x1f, 0)))
 		return;
 
 	u8 reg8;
diff --git a/src/southbridge/intel/i82801jx/i82801jx.c b/src/southbridge/intel/i82801jx/i82801jx.c
index 31df5c4..2f3ed4b 100644
--- a/src/southbridge/intel/i82801jx/i82801jx.c
+++ b/src/southbridge/intel/i82801jx/i82801jx.c
@@ -57,7 +57,7 @@
 
 	/* PCIe - BIOS must program... */
 	for (i = 0; i < 6; ++i) {
-		pciePort[i] = dev_find_slot(0, PCI_DEVFN(0x1c, i));
+		pciePort[i] = pcidev_on_root(0x1c, i);
 		if (!pciePort[i]) {
 			printk(BIOS_EMERG, "PCIe port 00:1c.%x", i);
 			die(" is not listed in devicetree.\n");
@@ -67,7 +67,7 @@
 		pci_write_config8(pciePort[i], 0x324, 0x40);
 	}
 
-	if (LPC_IS_MOBILE(dev_find_slot(0, PCI_DEVFN(0x1f, 0)))) {
+	if (LPC_IS_MOBILE(pcidev_on_root(0x1f, 0))) {
 		for (i = 0; i < 6; ++i) {
 			if (pciePort[i]->enabled) {
 				reg32 = pci_read_config32(pciePort[i], 0xe8);
@@ -115,10 +115,10 @@
 
 static void i82801jx_ehci_init(void)
 {
-	struct device *const pciEHCI1 = dev_find_slot(0, PCI_DEVFN(0x1d, 7));
+	struct device *const pciEHCI1 = pcidev_on_root(0x1d, 7);
 	if (!pciEHCI1)
 		die("EHCI controller (00:1d.7) not listed in devicetree.\n");
-	struct device *const pciEHCI2 = dev_find_slot(0, PCI_DEVFN(0x1a, 7));
+	struct device *const pciEHCI2 = pcidev_on_root(0x1a, 7);
 	if (!pciEHCI2)
 		die("EHCI controller (00:1a.7) not listed in devicetree.\n");
 
diff --git a/src/southbridge/intel/i82801jx/lpc.c b/src/southbridge/intel/i82801jx/lpc.c
index b9f2e4b..2ff2acd 100644
--- a/src/southbridge/intel/i82801jx/lpc.c
+++ b/src/southbridge/intel/i82801jx/lpc.c
@@ -501,7 +501,7 @@
 
 void acpi_fill_fadt(acpi_fadt_t *fadt)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 	u16 pmbase = pci_read_config16(dev, 0x40) & 0xfffe;
 
@@ -727,7 +727,7 @@
 
 static void southbridge_fill_ssdt(struct device *device)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f,0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 
 	intel_acpi_pcie_hotplug_generator(chip->pcie_hotplug_map, 8);
diff --git a/src/southbridge/intel/i82801jx/sata.c b/src/southbridge/intel/i82801jx/sata.c
index b511c54..5978294 100644
--- a/src/southbridge/intel/i82801jx/sata.c
+++ b/src/southbridge/intel/i82801jx/sata.c
@@ -208,8 +208,7 @@
 	pci_write_config32(dev, 0x94, sclkcg);
 
 	if (is_mobile && config->sata_traffic_monitor) {
-		struct device *const lpc_dev = dev_find_slot(0,
-							    PCI_DEVFN(0x1f, 0));
+		struct device *const lpc_dev = pcidev_on_root(0x1f, 0);
 		if (((pci_read_config8(lpc_dev, D31F0_CxSTATE_CNF)
 							>> 3) & 3) == 3) {
 			u8 reg8 = pci_read_config8(dev, 0x9c);
diff --git a/src/southbridge/intel/i82801jx/thermal.c b/src/southbridge/intel/i82801jx/thermal.c
index ae111a6..4a8ba29 100644
--- a/src/southbridge/intel/i82801jx/thermal.c
+++ b/src/southbridge/intel/i82801jx/thermal.c
@@ -24,7 +24,7 @@
 
 static void thermal_init(struct device *dev)
 {
-	if (LPC_IS_MOBILE(dev_find_slot(0, PCI_DEVFN(0x1f, 0))))
+	if (LPC_IS_MOBILE(pcidev_on_root(0x1f, 0)))
 		return;
 
 	u8 reg8;
diff --git a/src/southbridge/intel/ibexpeak/lpc.c b/src/southbridge/intel/ibexpeak/lpc.c
index e5cbc59..24a217d 100644
--- a/src/southbridge/intel/ibexpeak/lpc.c
+++ b/src/southbridge/intel/ibexpeak/lpc.c
@@ -647,7 +647,7 @@
 
 void acpi_fill_fadt(acpi_fadt_t *fadt)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f,0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 	u16 pmbase = pci_read_config16(dev, 0x40) & 0xfffe;
 	int c2_latency;
@@ -783,7 +783,7 @@
 
 static void southbridge_fill_ssdt(struct device *device)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f,0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
 
 	intel_acpi_pcie_hotplug_generator(chip->pcie_hotplug_map, 8);
diff --git a/src/southbridge/intel/lynxpoint/early_pch.c b/src/southbridge/intel/lynxpoint/early_pch.c
index 27a3b29..46e803d 100644
--- a/src/southbridge/intel/lynxpoint/early_pch.c
+++ b/src/southbridge/intel/lynxpoint/early_pch.c
@@ -99,7 +99,7 @@
 
 void pch_enable_lpc(void)
 {
-	const struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	const struct device *dev = pcidev_on_root(0x1f, 0);
 	const struct southbridge_intel_lynxpoint_config *config = NULL;
 
 	/* Set COM1/COM2 decode range */
diff --git a/src/southbridge/intel/lynxpoint/elog.c b/src/southbridge/intel/lynxpoint/elog.c
index c575db0..e16e1be 100644
--- a/src/southbridge/intel/lynxpoint/elog.c
+++ b/src/southbridge/intel/lynxpoint/elog.c
@@ -112,7 +112,7 @@
 {
 	u16 pm1_sts, gen_pmcon_3, tco2_sts;
 	u8 gen_pmcon_2;
-	struct device *lpc = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *lpc = pcidev_on_root(0x1f, 0);
 	if (!lpc)
 		return;
 
diff --git a/src/southbridge/intel/lynxpoint/lp_gpio.c b/src/southbridge/intel/lynxpoint/lp_gpio.c
index 2b07de2..b6edc8d 100644
--- a/src/southbridge/intel/lynxpoint/lp_gpio.c
+++ b/src/southbridge/intel/lynxpoint/lp_gpio.c
@@ -27,7 +27,7 @@
 #if defined(__PRE_RAM__) || defined(__SMM__)
 	return pci_read_config16(PCH_LPC_DEV, GPIO_BASE) & 0xfffc;
 #else
-	return pci_read_config16(dev_find_slot(0, PCI_DEVFN(0x1f, 0)),
+	return pci_read_config16(pcidev_on_root(0x1f, 0),
 				 GPIO_BASE) & 0xfffc;
 #endif
 }
diff --git a/src/southbridge/intel/lynxpoint/lpc.c b/src/southbridge/intel/lynxpoint/lpc.c
index f0fc22d..5b48da0 100644
--- a/src/southbridge/intel/lynxpoint/lpc.c
+++ b/src/southbridge/intel/lynxpoint/lpc.c
@@ -456,7 +456,7 @@
 	RCBA32_AND_OR(0x2614, 0x8bffffff, 0x0a206500);
 
 	/* Check for LPT-LP B2 stepping and 0:31.0@0xFA > 4 */
-	if (pci_read_config8(dev_find_slot(0, PCI_DEVFN(2, 0)), 0x8) >= 0x0b)
+	if (pci_read_config8(pcidev_on_root(2, 0), 0x8) >= 0x0b)
 		RCBA32_OR(0x2614, (1 << 26));
 
 	RCBA32_OR(0x900, 0x0000031f);
@@ -775,7 +775,7 @@
 
 void acpi_fill_fadt(acpi_fadt_t *fadt)
 {
-	struct device *dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	struct device *dev = pcidev_on_root(0x1f, 0);
 	struct southbridge_intel_lynxpoint_config *cfg = dev->chip_info;
 	u16 pmbase = get_pmbase();
 
diff --git a/src/southbridge/intel/lynxpoint/pch.c b/src/southbridge/intel/lynxpoint/pch.c
index 1fb6d7a..b197bbc 100644
--- a/src/southbridge/intel/lynxpoint/pch.c
+++ b/src/southbridge/intel/lynxpoint/pch.c
@@ -31,7 +31,7 @@
 #else
 static struct device *pch_get_lpc_device(void)
 {
-	return dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	return pcidev_on_root(0x1f, 0);
 }
 #endif
 
diff --git a/src/southbridge/intel/lynxpoint/watchdog.c b/src/southbridge/intel/lynxpoint/watchdog.c
index 9a867e4..ec7cb5d 100644
--- a/src/southbridge/intel/lynxpoint/watchdog.c
+++ b/src/southbridge/intel/lynxpoint/watchdog.c
@@ -32,7 +32,7 @@
 	unsigned long value, base;
 
 	/* Turn off the ICH7 watchdog. */
-	dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
+	dev = pcidev_on_root(0x1f, 0);
 
 	/* Enable I/O space. */
 	value = pci_read_config16(dev, 0x04);
diff --git a/src/southbridge/nvidia/ck804/ht.c b/src/southbridge/nvidia/ck804/ht.c
index 48b18cb..6028cd6 100644
--- a/src/southbridge/nvidia/ck804/ht.c
+++ b/src/southbridge/nvidia/ck804/ht.c
@@ -29,7 +29,7 @@
 	struct device *dev;
 	unsigned long mcfg_base;
 
-	dev = dev_find_slot(0x0, PCI_DEVFN(0x0,0));
+	dev = pcidev_on_root(0x0, 0);
 	if (!dev)
 		return current;