diff --git a/src/northbridge/intel/common/fixed_bars.h b/src/northbridge/intel/common/fixed_bars.h
index 8a0d9dc1b6..ed7b403fb0 100644
--- a/src/northbridge/intel/common/fixed_bars.h
+++ b/src/northbridge/intel/common/fixed_bars.h
@@ -3,10 +3,7 @@
 #ifndef NORTHBRIDGE_INTEL_COMMON_FIXED_BARS_H
 #define NORTHBRIDGE_INTEL_COMMON_FIXED_BARS_H
 
-_Static_assert(CONFIG_FIXED_MCHBAR_MMIO_BASE != 0, "MCHBAR base address is zero");
-_Static_assert(CONFIG_FIXED_DMIBAR_MMIO_BASE != 0, "DMIBAR base address is zero");
-_Static_assert(CONFIG_FIXED_EPBAR_MMIO_BASE  != 0,  "EPBAR base address is zero");
-
+#include <device/mmio.h>
 #include <stdint.h>
 
 /* Deprecated in favor of the read/write accessors below */
@@ -32,19 +29,106 @@ _Static_assert(CONFIG_FIXED_EPBAR_MMIO_BASE  != 0,  "EPBAR base address is zero"
 #define EPBAR16(x)	(*((volatile u16 *)((uintptr_t)CONFIG_FIXED_EPBAR_MMIO_BASE + (x))))
 #define EPBAR32(x)	(*((volatile u32 *)((uintptr_t)CONFIG_FIXED_EPBAR_MMIO_BASE + (x))))
 
-/* The *bar_{read,write}X macros will be replaced with functions in follow-ups */
+_Static_assert(CONFIG_FIXED_MCHBAR_MMIO_BASE != 0, "MCHBAR base address is zero");
+
+static __always_inline uint8_t mchbar_read8(const uintptr_t offset)
+{
+	return read8p(CONFIG_FIXED_MCHBAR_MMIO_BASE + offset);
+}
+
+static __always_inline uint16_t mchbar_read16(const uintptr_t offset)
+{
+	return read16p(CONFIG_FIXED_MCHBAR_MMIO_BASE + offset);
+}
+
+static __always_inline uint32_t mchbar_read32(const uintptr_t offset)
+{
+	return read32p(CONFIG_FIXED_MCHBAR_MMIO_BASE + offset);
+}
+
+static __always_inline void mchbar_write8(const uintptr_t offset, const uint8_t value)
+{
+	write8p(CONFIG_FIXED_MCHBAR_MMIO_BASE + offset, value);
+}
+
+static __always_inline void mchbar_write16(const uintptr_t offset, const uint16_t value)
+{
+	write16p(CONFIG_FIXED_MCHBAR_MMIO_BASE + offset, value);
+}
+
+static __always_inline void mchbar_write32(const uintptr_t offset, const uint32_t value)
+{
+	write32p(CONFIG_FIXED_MCHBAR_MMIO_BASE + offset, value);
+}
+
+_Static_assert(CONFIG_FIXED_DMIBAR_MMIO_BASE != 0, "DMIBAR base address is zero");
+
+static __always_inline uint8_t dmibar_read8(const uintptr_t offset)
+{
+	return read8p(CONFIG_FIXED_DMIBAR_MMIO_BASE + offset);
+}
+
+static __always_inline uint16_t dmibar_read16(const uintptr_t offset)
+{
+	return read16p(CONFIG_FIXED_DMIBAR_MMIO_BASE + offset);
+}
+
+static __always_inline uint32_t dmibar_read32(const uintptr_t offset)
+{
+	return read32p(CONFIG_FIXED_DMIBAR_MMIO_BASE + offset);
+}
+
+static __always_inline void dmibar_write8(const uintptr_t offset, const uint8_t value)
+{
+	write8p(CONFIG_FIXED_DMIBAR_MMIO_BASE + offset, value);
+}
+
+static __always_inline void dmibar_write16(const uintptr_t offset, const uint16_t value)
+{
+	write16p(CONFIG_FIXED_DMIBAR_MMIO_BASE + offset, value);
+}
+
+static __always_inline void dmibar_write32(const uintptr_t offset, const uint32_t value)
+{
+	write32p(CONFIG_FIXED_DMIBAR_MMIO_BASE + offset, value);
+}
+
+_Static_assert(CONFIG_FIXED_EPBAR_MMIO_BASE  != 0,  "EPBAR base address is zero");
+
+static __always_inline uint8_t epbar_read8(const uintptr_t offset)
+{
+	return read8p(CONFIG_FIXED_EPBAR_MMIO_BASE + offset);
+}
+
+static __always_inline uint16_t epbar_read16(const uintptr_t offset)
+{
+	return read16p(CONFIG_FIXED_EPBAR_MMIO_BASE + offset);
+}
+
+static __always_inline uint32_t epbar_read32(const uintptr_t offset)
+{
+	return read32p(CONFIG_FIXED_EPBAR_MMIO_BASE + offset);
+}
+
+static __always_inline void epbar_write8(const uintptr_t offset, const uint8_t value)
+{
+	write8p(CONFIG_FIXED_EPBAR_MMIO_BASE + offset, value);
+}
+
+static __always_inline void epbar_write16(const uintptr_t offset, const uint16_t value)
+{
+	write16p(CONFIG_FIXED_EPBAR_MMIO_BASE + offset, value);
+}
+
+static __always_inline void epbar_write32(const uintptr_t offset, const uint32_t value)
+{
+	write32p(CONFIG_FIXED_EPBAR_MMIO_BASE + offset, value);
+}
+
 #define _bar_clrsetbits_impl(base, addr, clear, set, bits)				\
 		base##bar_write##bits(addr,						\
 			(base##bar_read##bits(addr) & ~(uint##bits##_t)(clear)) | (set))
 
-#define mchbar_read8(addr)		MCHBAR8(addr)
-#define mchbar_read16(addr)		MCHBAR16(addr)
-#define mchbar_read32(addr)		MCHBAR32(addr)
-
-#define mchbar_write8(addr, value)	(MCHBAR8(addr) = (value))
-#define mchbar_write16(addr, value)	(MCHBAR16(addr) = (value))
-#define mchbar_write32(addr, value)	(MCHBAR32(addr) = (value))
-
 #define mchbar_clrsetbits8(addr, clear, set)	_bar_clrsetbits_impl(mch, addr, clear, set, 8)
 #define mchbar_clrsetbits16(addr, clear, set)	_bar_clrsetbits_impl(mch, addr, clear, set, 16)
 #define mchbar_clrsetbits32(addr, clear, set)	_bar_clrsetbits_impl(mch, addr, clear, set, 32)
@@ -57,14 +141,6 @@ _Static_assert(CONFIG_FIXED_EPBAR_MMIO_BASE  != 0,  "EPBAR base address is zero"
 #define mchbar_clrbits16(addr, clear)		mchbar_clrsetbits16(addr, clear, 0)
 #define mchbar_clrbits32(addr, clear)		mchbar_clrsetbits32(addr, clear, 0)
 
-#define dmibar_read8(addr)		DMIBAR8(addr)
-#define dmibar_read16(addr)		DMIBAR16(addr)
-#define dmibar_read32(addr)		DMIBAR32(addr)
-
-#define dmibar_write8(addr, value)	(DMIBAR8(addr) = (value))
-#define dmibar_write16(addr, value)	(DMIBAR16(addr) = (value))
-#define dmibar_write32(addr, value)	(DMIBAR32(addr) = (value))
-
 #define dmibar_clrsetbits8(addr, clear, set)	_bar_clrsetbits_impl(dmi, addr, clear, set, 8)
 #define dmibar_clrsetbits16(addr, clear, set)	_bar_clrsetbits_impl(dmi, addr, clear, set, 16)
 #define dmibar_clrsetbits32(addr, clear, set)	_bar_clrsetbits_impl(dmi, addr, clear, set, 32)
@@ -77,14 +153,6 @@ _Static_assert(CONFIG_FIXED_EPBAR_MMIO_BASE  != 0,  "EPBAR base address is zero"
 #define dmibar_clrbits16(addr, clear)		dmibar_clrsetbits16(addr, clear, 0)
 #define dmibar_clrbits32(addr, clear)		dmibar_clrsetbits32(addr, clear, 0)
 
-#define epbar_read8(addr)		EPBAR8(addr)
-#define epbar_read16(addr)		EPBAR16(addr)
-#define epbar_read32(addr)		EPBAR32(addr)
-
-#define epbar_write8(addr, value)	(EPBAR8(addr) = (value))
-#define epbar_write16(addr, value)	(EPBAR16(addr) = (value))
-#define epbar_write32(addr, value)	(EPBAR32(addr) = (value))
-
 #define epbar_clrsetbits8(addr, clear, set)	_bar_clrsetbits_impl(ep, addr, clear, set, 8)
 #define epbar_clrsetbits16(addr, clear, set)	_bar_clrsetbits_impl(ep, addr, clear, set, 16)
 #define epbar_clrsetbits32(addr, clear, set)	_bar_clrsetbits_impl(ep, addr, clear, set, 32)