22 files changed, 331 insertions, 218 deletions

diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index db589167838c..cd1f754c1336 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -16,6 +16,11 @@ config H8300
 	select OF_EARLY_FLATTREE
 	select HAVE_MEMBLOCK
 	select HAVE_DMA_ATTRS
+	select CLKSRC_OF
+	select H8300_TMR8
+	select HAVE_KERNEL_GZIP
+	select HAVE_KERNEL_LZO
+	select HAVE_ARCH_KGDB
 
 config RWSEM_GENERIC_SPINLOCK
 	def_bool y
diff --git a/arch/h8300/Makefile b/arch/h8300/Makefile
index 0d2d96e52d9f..e1c02ca230cb 100644
--- a/arch/h8300/Makefile
+++ b/arch/h8300/Makefile
@@ -22,7 +22,9 @@ KBUILD_CFLAGS += -DUTS_SYSNAME=\"uClinux\"
 KBUILD_AFLAGS += $(aflags-y)
 LDFLAGS += $(ldflags-y)
 
+ifeq ($(CROSS_COMPILE),)
 CROSS_COMPILE := h8300-unknown-linux-
+endif
 
 core-y	+= arch/$(ARCH)/kernel/ arch/$(ARCH)/mm/
 ifneq '$(CONFIG_H8300_BUILTIN_DTB)' '""'
diff --git a/arch/h8300/boot/compressed/Makefile b/arch/h8300/boot/compressed/Makefile
index 87d03b7ee97e..7643633f1330 100644
--- a/arch/h8300/boot/compressed/Makefile
+++ b/arch/h8300/boot/compressed/Makefile
@@ -14,11 +14,12 @@ OBJECTS = $(obj)/head.o $(obj)/misc.o
 # in order to suppress error message.
 #
 CONFIG_MEMORY_START     ?= 0x00400000
-CONFIG_BOOT_LINK_OFFSET ?= 0x00140000
+CONFIG_BOOT_LINK_OFFSET ?= 0x00280000
 IMAGE_OFFSET := $(shell printf "0x%08x" $$(($(CONFIG_MEMORY_START)+$(CONFIG_BOOT_LINK_OFFSET))))
 
 LIBGCC := $(shell $(CROSS-COMPILE)$(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
-LDFLAGS_vmlinux := -Ttext $(IMAGE_OFFSET) -estartup $(obj)/vmlinux.lds
+LDFLAGS_vmlinux := -Ttext $(IMAGE_OFFSET) -estartup -T $(obj)/vmlinux.lds \
+	--defsym output=$(CONFIG_MEMORY_START)
 
 $(obj)/vmlinux: $(OBJECTS) $(obj)/piggy.o $(LIBGCC) FORCE
 	$(call if_changed,ld)
@@ -27,11 +28,16 @@ $(obj)/vmlinux: $(OBJECTS) $(obj)/piggy.o $(LIBGCC) FORCE
 $(obj)/vmlinux.bin: vmlinux FORCE
 	$(call if_changed,objcopy)
 
-$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
-	$(call if_changed,gzip)
+suffix-$(CONFIG_KERNEL_GZIP)    := gzip
+suffix-$(CONFIG_KERNEL_LZO)     := lzo
+
+$(obj)/vmlinux.bin.$(suffix-y): $(obj)/vmlinux.bin FORCE
+	$(call if_changed,$(suffix-y))
 
 LDFLAGS_piggy.o := -r --format binary --oformat elf32-h8300-linux -T
 OBJCOPYFLAGS := -O binary
 
-$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.gz FORCE
+$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix-y) FORCE
 	$(call if_changed,ld)
+
+CFLAGS_misc.o = -O0
diff --git a/arch/h8300/boot/compressed/head.S b/arch/h8300/boot/compressed/head.S
index 74c0d8cc40ba..0436350c1df5 100644
--- a/arch/h8300/boot/compressed/head.S
+++ b/arch/h8300/boot/compressed/head.S
@@ -9,8 +9,8 @@
 	.section	.text..startup,"ax"
 	.global	startup
 startup:
+	mov.l	#startup, sp
 	mov.l	er0, er4
-	mov.l	er0, sp
 	mov.l	#__sbss, er0
 	mov.l	#__ebss, er1
 	sub.l	er0, er1
@@ -24,7 +24,7 @@ startup:
 	bne	1b
 	jsr	@decompress_kernel
 	mov.l	er4, er0
-	jmp	@0x400000
+	jmp	@output
 
 	.align	9
 fake_headers_as_bzImage:
diff --git a/arch/h8300/boot/compressed/misc.c b/arch/h8300/boot/compressed/misc.c
index 704274127c07..9f64fe8f29ff 100644
--- a/arch/h8300/boot/compressed/misc.c
+++ b/arch/h8300/boot/compressed/misc.c
@@ -28,11 +28,17 @@ static unsigned long free_mem_end_ptr;
 
 extern char input_data[];
 extern int input_len;
-static unsigned char *output;
+extern char output[];
 
 #define HEAP_SIZE             0x10000
 
+#ifdef CONFIG_KERNEL_GZIP
 #include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZO
+#include "../../../../lib/decompress_unlzo.c"
+#endif
 
 void *memset(void *s, int c, size_t n)
 {
@@ -56,19 +62,14 @@ void *memcpy(void *dest, const void *src, size_t n)
 
 static void error(char *x)
 {
-
 	while (1)
 		;	/* Halt */
 }
 
-#define STACK_SIZE (4096)
-long user_stack[STACK_SIZE];
-long *stack_start = &user_stack[STACK_SIZE];
-
 void decompress_kernel(void)
 {
 	free_mem_ptr = (unsigned long)&_end;
 	free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 
-	decompress(input_data, input_len, NULL, NULL, output, NULL, error);
+	__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
 }
diff --git a/arch/h8300/boot/compressed/vmlinux.lds b/arch/h8300/boot/compressed/vmlinux.lds
index a0a3a0ed54ef..ad848a72fd3f 100644
--- a/arch/h8300/boot/compressed/vmlinux.lds
+++ b/arch/h8300/boot/compressed/vmlinux.lds
@@ -13,20 +13,22 @@ SECTIONS
 	{
 		*(.rodata)
 	}
+        . = ALIGN(0x4) ;
         .data :
 
         {
+        . = ALIGN(0x4) ;
         __sdata = . ;
         ___data_start = . ;
                 *(.data.*)
 	}
+        . = ALIGN(0x4) ;
         .bss :
         {
-        . = ALIGN(0x4) ;
         __sbss = . ;
                 *(.bss*)
         . = ALIGN(0x4) ;
         __ebss = . ;
-        __end = . ;
         }
+        _end = . ;
 }
diff --git a/arch/h8300/boot/dts/Makefile b/arch/h8300/boot/dts/Makefile
index 0abaf1ad830e..6c08467c6a3a 100644
--- a/arch/h8300/boot/dts/Makefile
+++ b/arch/h8300/boot/dts/Makefile
@@ -8,5 +8,8 @@ dtb-$(CONFIG_H8300H_SIM) := h8300h_sim.dtb
 dtb-$(CONFIG_H8S_SIM) := h8s_sim.dtb
 dtb-$(CONFIG_H8S_EDOSK2674) := edosk2674.dtb
 
+dtstree		:= $(srctree)/$(src)
+dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
+
 always	    := $(dtb-y)
 clean-files := *.dtb.S *.dtb
diff --git a/arch/h8300/boot/dts/edosk2674.dts b/arch/h8300/boot/dts/edosk2674.dts
index dfb5c102f8da..4ce9fa874a57 100644
--- a/arch/h8300/boot/dts/edosk2674.dts
+++ b/arch/h8300/boot/dts/edosk2674.dts
@@ -7,7 +7,7 @@
 
 	chosen {
 		bootargs = "console=ttySC2,38400";
-		stdout-path = <&sci2>;
+		stdout-path = &sci2;
 	};
 	aliases {
 		serial0 = &sci0;
@@ -25,13 +25,13 @@
 		compatible = "renesas,h8s2678-pll-clock";
 		clocks = <&xclk>;
 		#clock-cells = <0>;
-		reg = <0xfee03b 2>, <0xfee045 2>;
+		reg = <0xffff3b 1>, <0xffff45 1>;
 	};
 	core_clk: core_clk {
 		compatible = "renesas,h8300-div-clock";
 		clocks = <&pllclk>;
 		#clock-cells = <0>;
-		reg = <0xfee03b 2>;
+		reg = <0xffff3b 1>;
 		renesas,width = <3>;
 	};
 	fclk: fclk {
diff --git a/arch/h8300/include/asm/Kbuild b/arch/h8300/include/asm/Kbuild
index 70e6ae1e7006..373cb23301e3 100644
--- a/arch/h8300/include/asm/Kbuild
+++ b/arch/h8300/include/asm/Kbuild
@@ -73,4 +73,5 @@ generic-y += uaccess.h
 generic-y += ucontext.h
 generic-y += unaligned.h
 generic-y += vga.h
+generic-y += word-at-a-time.h
 generic-y += xor.h
diff --git a/arch/h8300/include/asm/atomic.h b/arch/h8300/include/asm/atomic.h
index 7ca73f8546cc..4435a445ae7e 100644
--- a/arch/h8300/include/asm/atomic.h
+++ b/arch/h8300/include/asm/atomic.h
@@ -11,88 +11,57 @@
 
 #define ATOMIC_INIT(i)	{ (i) }
 
-#define atomic_read(v)		ACCESS_ONCE((v)->counter)
-#define atomic_set(v, i)	(((v)->counter) = i)
+#define atomic_read(v)		READ_ONCE((v)->counter)
+#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))
 
 #include <linux/kernel.h>
 
-static inline int atomic_add_return(int i, atomic_t *v)
-{
-	h8300flags flags;
-	int ret;
-
-	flags = arch_local_irq_save();
-	ret = v->counter += i;
-	arch_local_irq_restore(flags);
-	return ret;
+#define ATOMIC_OP_RETURN(op, c_op)				\
+static inline int atomic_##op##_return(int i, atomic_t *v)	\
+{								\
+	h8300flags flags;					\
+	int ret;						\
+								\
+	flags = arch_local_irq_save();				\
+	ret = v->counter c_op i;				\
+	arch_local_irq_restore(flags);				\
+	return ret;						\
 }
 
-#define atomic_add(i, v) atomic_add_return(i, v)
-#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
-
-static inline int atomic_sub_return(int i, atomic_t *v)
-{
-	h8300flags flags;
-	int ret;
-
-	flags = arch_local_irq_save();
-	ret = v->counter -= i;
-	arch_local_irq_restore(flags);
-	return ret;
+#define ATOMIC_OP(op, c_op)					\
+static inline void atomic_##op(int i, atomic_t *v)		\
+{								\
+	h8300flags flags;					\
+								\
+	flags = arch_local_irq_save();				\
+	v->counter c_op i;					\
+	arch_local_irq_restore(flags);				\
 }
 
-#define atomic_sub(i, v) atomic_sub_return(i, v)
-#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
+ATOMIC_OP_RETURN(add, +=)
+ATOMIC_OP_RETURN(sub, -=)
 
-static inline int atomic_inc_return(atomic_t *v)
-{
-	h8300flags flags;
-	int ret;
+ATOMIC_OP(and, &=)
+ATOMIC_OP(or,  |=)
+ATOMIC_OP(xor, ^=)
 
-	flags = arch_local_irq_save();
-	v->counter++;
-	ret = v->counter;
-	arch_local_irq_restore(flags);
-	return ret;
-}
-
-#define atomic_inc(v) atomic_inc_return(v)
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
 
-/*
- * atomic_inc_and_test - increment and test
- * @v: pointer of type atomic_t
- *
- * Atomically increments @v by 1
- * and returns true if the result is zero, or false for all
- * other cases.
- */
-#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
+#define atomic_add(i, v)		(void)atomic_add_return(i, v)
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
 
-static inline int atomic_dec_return(atomic_t *v)
-{
-	h8300flags flags;
-	int ret;
+#define atomic_sub(i, v)		(void)atomic_sub_return(i, v)
+#define atomic_sub_and_test(i, v)	(atomic_sub_return(i, v) == 0)
 
-	flags = arch_local_irq_save();
-	--v->counter;
-	ret = v->counter;
-	arch_local_irq_restore(flags);
-	return ret;
-}
+#define atomic_inc_return(v)		atomic_add_return(1, v)
+#define atomic_dec_return(v)		atomic_sub_return(1, v)
 
-#define atomic_dec(v) atomic_dec_return(v)
+#define atomic_inc(v)			(void)atomic_inc_return(v)
+#define atomic_inc_and_test(v)		(atomic_inc_return(v) == 0)
 
-static inline int atomic_dec_and_test(atomic_t *v)
-{
-	h8300flags flags;
-	int ret;
-
-	flags = arch_local_irq_save();
-	--v->counter;
-	ret = v->counter;
-	arch_local_irq_restore(flags);
-	return ret == 0;
-}
+#define atomic_dec(v)			(void)atomic_dec_return(v)
+#define atomic_dec_and_test(v)		(atomic_dec_return(v) == 0)
 
 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
 {
@@ -120,40 +89,4 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
 	return ret;
 }
 
-static inline void atomic_clear_mask(unsigned long mask, unsigned long *v)
-{
-	unsigned char ccr;
-	unsigned long tmp;
-
-	__asm__ __volatile__("stc ccr,%w3\n\t"
-			     "orc #0x80,ccr\n\t"
-			     "mov.l %0,%1\n\t"
-			     "and.l %2,%1\n\t"
-			     "mov.l %1,%0\n\t"
-			     "ldc %w3,ccr"
-			     : "=m"(*v), "=r"(tmp)
-			     : "g"(~(mask)), "r"(ccr));
-}
-
-static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
-{
-	unsigned char ccr;
-	unsigned long tmp;
-
-	__asm__ __volatile__("stc ccr,%w3\n\t"
-			     "orc #0x80,ccr\n\t"
-			     "mov.l %0,%1\n\t"
-			     "or.l %2,%1\n\t"
-			     "mov.l %1,%0\n\t"
-			     "ldc %w3,ccr"
-			     : "=m"(*v), "=r"(tmp)
-			     : "g"(~(mask)), "r"(ccr));
-}
-
-/* Atomic operations are already serializing */
-#define smp_mb__before_atomic_dec()    barrier()
-#define smp_mb__after_atomic_dec() barrier()
-#define smp_mb__before_atomic_inc()    barrier()
-#define smp_mb__after_atomic_inc() barrier()
-
 #endif /* __ARCH_H8300_ATOMIC __ */
diff --git a/arch/h8300/include/asm/dma-mapping.h b/arch/h8300/include/asm/dma-mapping.h
index 6e67a90902f2..d9b5b806afe6 100644
--- a/arch/h8300/include/asm/dma-mapping.h
+++ b/arch/h8300/include/asm/dma-mapping.h
@@ -1,8 +1,6 @@
 #ifndef _H8300_DMA_MAPPING_H
 #define _H8300_DMA_MAPPING_H
 
-#include <asm-generic/dma-coherent.h>
-
 extern struct dma_map_ops h8300_dma_map_ops;
 
 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
@@ -12,46 +10,4 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 
 #include <asm-generic/dma-mapping-common.h>
 
-static inline int dma_supported(struct device *dev, u64 mask)
-{
-	return 0;
-}
-
-static inline int dma_set_mask(struct device *dev, u64 mask)
-{
-	return 0;
-}
-
-#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
-#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
-
-#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
-
-static inline void *dma_alloc_attrs(struct device *dev, size_t size,
-				    dma_addr_t *dma_handle, gfp_t flag,
-				    struct dma_attrs *attrs)
-{
-	struct dma_map_ops *ops = get_dma_ops(dev);
-	void *memory;
-
-	memory = ops->alloc(dev, size, dma_handle, flag, attrs);
-	return memory;
-}
-
-#define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
-
-static inline void dma_free_attrs(struct device *dev, size_t size,
-				  void *cpu_addr, dma_addr_t dma_handle,
-				  struct dma_attrs *attrs)
-{
-	struct dma_map_ops *ops = get_dma_ops(dev);
-
-	ops->free(dev, size, cpu_addr, dma_handle, attrs);
-}
-
-static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-	return 0;
-}
-
 #endif
diff --git a/arch/h8300/include/asm/io.h b/arch/h8300/include/asm/io.h
index 1d09b2f2e0fe..2e221c5f0203 100644
--- a/arch/h8300/include/asm/io.h
+++ b/arch/h8300/include/asm/io.h
@@ -3,55 +3,62 @@
 
 #ifdef __KERNEL__
 
-#include <asm-generic/io.h>
-
 /* H8/300 internal I/O functions */
-static inline unsigned char ctrl_inb(unsigned long addr)
+
+#define __raw_readb __raw_readb
+static inline u8 __raw_readb(const volatile void __iomem *addr)
 {
-	return *(volatile unsigned char *)addr;
+	return *(volatile u8 *)addr;
 }
 
-static inline unsigned short ctrl_inw(unsigned long addr)
+#define __raw_readw __raw_readw
+static inline u16 __raw_readw(const volatile void __iomem *addr)
 {
-	return *(volatile unsigned short *)addr;
+	return *(volatile u16 *)addr;
 }
 
-static inline unsigned long ctrl_inl(unsigned long addr)
+#define __raw_readl __raw_readl
+static inline u32  __raw_readl(const volatile void __iomem *addr)
 {
-	return *(volatile unsigned long *)addr;
+	return *(volatile u32 *)addr;
 }
 
-static inline void ctrl_outb(unsigned char b, unsigned long addr)
+#define __raw_writeb __raw_writeb
+static inline void __raw_writeb(u8 b, const volatile void __iomem *addr)
 {
-	*(volatile unsigned char *)addr = b;
+	*(volatile u8 *)addr = b;
 }
 
-static inline void ctrl_outw(unsigned short b, unsigned long addr)
+#define __raw_writew __raw_writew
+static inline void __raw_writew(u16 b, const volatile void __iomem *addr)
 {
-	*(volatile unsigned short *)addr = b;
+	*(volatile u16 *)addr = b;
 }
 
-static inline void ctrl_outl(unsigned long b, unsigned long addr)
+#define __raw_writel __raw_writel
+static inline void __raw_writel(u32 b, const volatile void __iomem *addr)
 {
-	*(volatile unsigned long *)addr = b;
+	*(volatile u32 *)addr = b;
 }
 
-static inline void ctrl_bclr(int b, unsigned long addr)
+static inline void ctrl_bclr(int b, void __iomem *addr)
 {
 	if (__builtin_constant_p(b))
-		__asm__("bclr %1,%0" : : "WU"(addr), "i"(b));
+		__asm__("bclr %1,%0" : "+WU"(*(u8 *)addr): "i"(b));
 	else
-		__asm__("bclr %w1,%0" : : "WU"(addr), "r"(b));
+		__asm__("bclr %w1,%0" : "+WU"(*(u8 *)addr): "r"(b));
 }
 
-static inline void ctrl_bset(int b, unsigned long addr)
+static inline void ctrl_bset(int b, void __iomem *addr)
 {
 	if (__builtin_constant_p(b))
-		__asm__("bset %1,%0" : : "WU"(addr), "i"(b));
+		__asm__("bset %1,%0" : "+WU"(*(u8 *)addr): "i"(b));
 	else
-		__asm__("bset %w1,%0" : : "WU"(addr), "r"(b));
+		__asm__("bset %w1,%0" : "+WU"(*(u8 *)addr): "r"(b));
 }
 
+#include <asm-generic/io.h>
+
 #endif /* __KERNEL__ */
 
 #endif /* _H8300_IO_H */
diff --git a/arch/h8300/include/asm/kgdb.h b/arch/h8300/include/asm/kgdb.h
new file mode 100644
index 000000000000..726ff8fdfc18
--- /dev/null
+++ b/arch/h8300/include/asm/kgdb.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_H8300_KGDB_H
+#define _ASM_H8300_KGDB_H
+
+#define CACHE_FLUSH_IS_SAFE	1
+#define BUFMAX			2048
+
+enum regnames {
+	GDB_ER0, GDB_ER1, GDB_ER2, GDB_ER3,
+	GDB_ER4, GDB_ER5, GDB_ER6, GDB_SP,
+	GDB_CCR, GDB_PC,
+	GDB_CYCLLE,
+#if defined(CONFIG_CPU_H8S)
+	GDB_EXR,
+#endif
+	GDB_TICK, GDB_INST,
+#if defined(CONFIG_CPU_H8S)
+	GDB_MACH, GDB_MACL,
+#endif
+	/* do not change the last entry or anything below! */
+	GDB_NUMREGBYTES,		/* number of registers */
+};
+
+#define GDB_SIZEOF_REG		sizeof(u32)
+#if defined(CONFIG_CPU_H8300H)
+#define DBG_MAX_REG_NUM		(13)
+#elif defined(CONFIG_CPU_H8S)
+#define DBG_MAX_REG_NUM		(14)
+#endif
+#define NUMREGBYTES		(DBG_MAX_REG_NUM * GDB_SIZEOF_REG)
+
+#define BREAK_INSTR_SIZE	2
+static inline void arch_kgdb_breakpoint(void)
+{
+	__asm__ __volatile__("trapa #2");
+}
+
+#endif /* _ASM_H8300_KGDB_H */
diff --git a/arch/h8300/include/asm/thread_info.h b/arch/h8300/include/asm/thread_info.h
index 544c30785ad4..b408fe660cf8 100644
--- a/arch/h8300/include/asm/thread_info.h
+++ b/arch/h8300/include/asm/thread_info.h
@@ -13,6 +13,12 @@
 
 #ifdef __KERNEL__
 
+/*
+ * Size of kernel stack for each process. This must be a power of 2...
+ */
+#define THREAD_SIZE_ORDER	1
+#define THREAD_SIZE		8192	/* 2 pages */
+
 #ifndef __ASSEMBLY__
 
 /*
@@ -46,14 +52,6 @@ struct thread_info {
 #define init_thread_info	(init_thread_union.thread_info)
 #define init_stack		(init_thread_union.stack)
 
-
-/*
- * Size of kernel stack for each process. This must be a power of 2...
- */
-#define THREAD_SIZE_ORDER	1
-#define THREAD_SIZE		8192	/* 2 pages */
-
-
 /* how to get the thread information struct from C */
 static inline struct thread_info *current_thread_info(void)
 {
diff --git a/arch/h8300/include/asm/traps.h b/arch/h8300/include/asm/traps.h
index aa34e75fd767..15e701130b27 100644
--- a/arch/h8300/include/asm/traps.h
+++ b/arch/h8300/include/asm/traps.h
@@ -36,6 +36,6 @@ extern unsigned long *_interrupt_redirect_table;
 extern char _start, _etext;
 #define check_kernel_text(addr) \
 	((addr >= (unsigned long)(&_start)) && \
-	 (addr <  (unsigned long)(&_etext)))
+	 (addr <  (unsigned long)(&_etext)) && !(addr & 1))
 
 #endif /* _H8300_TRAPS_H */
diff --git a/arch/h8300/kernel/Makefile b/arch/h8300/kernel/Makefile
index 5bc33f2fcc08..253f8e322ecc 100644
--- a/arch/h8300/kernel/Makefile
+++ b/arch/h8300/kernel/Makefile
@@ -17,3 +17,5 @@ obj-$(CONFIG_H8S_SIM) += sim-console.o
 
 obj-$(CONFIG_CPU_H8300H) += ptrace_h.o
 obj-$(CONFIG_CPU_H8S) += ptrace_s.o
+
+obj-$(CONFIG_KGDB) += kgdb.o
diff --git a/arch/h8300/kernel/entry.S b/arch/h8300/kernel/entry.S
index 797dfa8ddeb2..4f67d4b350d5 100644
--- a/arch/h8300/kernel/entry.S
+++ b/arch/h8300/kernel/entry.S
@@ -188,7 +188,11 @@ _interrupt_redirect_table:
 	jsr	@_interrupt_entry		/* NMI */
 	jmp	@_system_call			/* TRAPA #0 (System call) */
 	.long	0
+#if defined(CONFIG_KGDB)
+	jmp	@_kgdb_trap
+#else
 	.long	0
+#endif
 	jmp	@_trace_break			/* TRAPA #3 (breakpoint) */
 	.rept	INTERRUPTS-12
 	jsr	@_interrupt_entry
@@ -242,6 +246,7 @@ _system_call:
 	/* save top of frame */
 	mov.l	sp,er0
 	jsr	@set_esp0
+	andc	#0x3f,ccr
 	mov.l	sp,er2
 	and.w	#0xe000,r2
 	mov.l	@(TI_FLAGS:16,er2),er2
@@ -405,6 +410,20 @@ _nmi:
 	mov.l	@sp+, er0
 	jmp	@_interrupt_entry
 
+#if defined(CONFIG_KGDB)
+_kgdb_trap:
+	subs	#4,sp
+	SAVE_ALL
+	mov.l	sp,er0
+	add.l	#LRET,er0
+	mov.l	er0,@(LSP,sp)
+	jsr	@set_esp0
+	mov.l	sp,er0
+	subs	#4,er0
+	jsr	@h8300_kgdb_trap
+	jmp	@ret_from_exception
+#endif
+
 	.section	.bss
 _sw_ksp:
 	.space	4
diff --git a/arch/h8300/kernel/kgdb.c b/arch/h8300/kernel/kgdb.c
new file mode 100644
index 000000000000..602e478afbd5
--- /dev/null
+++ b/arch/h8300/kernel/kgdb.c
@@ -0,0 +1,135 @@
+/*
+ * H8/300 KGDB support
+ *
+ * Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/ptrace.h>
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
+#include <linux/io.h>
+
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
+	{ "er0", GDB_SIZEOF_REG, offsetof(struct pt_regs, er0) },
+	{ "er1", GDB_SIZEOF_REG, offsetof(struct pt_regs, er1) },
+	{ "er2", GDB_SIZEOF_REG, offsetof(struct pt_regs, er2) },
+	{ "er3", GDB_SIZEOF_REG, offsetof(struct pt_regs, er3) },
+	{ "er4", GDB_SIZEOF_REG, offsetof(struct pt_regs, er4) },
+	{ "er5", GDB_SIZEOF_REG, offsetof(struct pt_regs, er5) },
+	{ "er6", GDB_SIZEOF_REG, offsetof(struct pt_regs, er6) },
+	{ "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, sp) },
+	{ "ccr", GDB_SIZEOF_REG, offsetof(struct pt_regs, ccr) },
+	{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, pc) },
+	{ "cycles", GDB_SIZEOF_REG, -1 },
+#if defined(CONFIG_CPU_H8S)
+	{ "exr", GDB_SIZEOF_REG, offsetof(struct pt_regs, exr) },
+#endif
+	{ "tick", GDB_SIZEOF_REG, -1 },
+	{ "inst", GDB_SIZEOF_REG, -1 },
+};
+
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
+{
+	if (regno >= DBG_MAX_REG_NUM || regno < 0)
+		return NULL;
+
+	switch (regno) {
+	case GDB_CCR:
+#if defined(CONFIG_CPU_H8S)
+	case GDB_EXR:
+#endif
+		*(u32 *)mem = *(u16 *)((void *)regs +
+				       dbg_reg_def[regno].offset);
+		break;
+	default:
+		if (dbg_reg_def[regno].offset >= 0)
+			memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+			       dbg_reg_def[regno].size);
+		else
+			memset(mem, 0, dbg_reg_def[regno].size);
+		break;
+	}
+	return dbg_reg_def[regno].name;
+}
+
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
+{
+	if (regno >= DBG_MAX_REG_NUM || regno < 0)
+		return -EINVAL;
+
+	switch (regno) {
+	case GDB_CCR:
+#if defined(CONFIG_CPU_H8S)
+	case GDB_EXR:
+#endif
+		*(u16 *)((void *)regs +
+			 dbg_reg_def[regno].offset) = *(u32 *)mem;
+		break;
+	default:
+		memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+		       dbg_reg_def[regno].size);
+	}
+	return 0;
+}
+
+asmlinkage void h8300_kgdb_trap(struct pt_regs *regs)
+{
+	regs->pc &= 0x00ffffff;
+	if (kgdb_handle_exception(10, SIGTRAP, 0, regs))
+		return;
+	if (*(u16 *)(regs->pc) == *(u16 *)&arch_kgdb_ops.gdb_bpt_instr)
+		regs->pc += BREAK_INSTR_SIZE;
+	regs->pc |= regs->ccr << 24;
+}
+
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+	memset((char *)gdb_regs, 0, NUMREGBYTES);
+	gdb_regs[GDB_SP] = p->thread.ksp;
+	gdb_regs[GDB_PC] = KSTK_EIP(p);
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
+{
+	regs->pc = pc;
+}
+
+int kgdb_arch_handle_exception(int vector, int signo, int err_code,
+				char *remcom_in_buffer, char *remcom_out_buffer,
+				struct pt_regs *regs)
+{
+	char *ptr;
+	unsigned long addr;
+
+	switch (remcom_in_buffer[0]) {
+	case 's':
+	case 'c':
+		/* handle the optional parameters */
+		ptr = &remcom_in_buffer[1];
+		if (kgdb_hex2long(&ptr, &addr))
+			regs->pc = addr;
+
+		return 0;
+	}
+
+	return -1; /* this means that we do not want to exit from the handler */
+}
+
+int kgdb_arch_init(void)
+{
+	return 0;
+}
+
+void kgdb_arch_exit(void)
+{
+	/* Nothing to do */
+}
+
+const struct kgdb_arch arch_kgdb_ops = {
+	/* Breakpoint instruction: trapa #2 */
+	.gdb_bpt_instr = { 0x57, 0x20 },
+};
diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
index 0fd1fe65c0b8..e4985dfa91dc 100644
--- a/arch/h8300/kernel/setup.c
+++ b/arch/h8300/kernel/setup.c
@@ -29,6 +29,7 @@
 #include <linux/clk-provider.h>
 #include <linux/memblock.h>
 #include <linux/screen_info.h>
+#include <linux/clocksource.h>
 
 #include <asm/setup.h>
 #include <asm/irq.h>
@@ -206,14 +207,14 @@ device_initcall(device_probe);
 #define get_wait(base, addr) ({		\
 	int baddr;			\
 	baddr = ((addr) / 0x200000 * 2);			     \
-	w *= (ctrl_inw((unsigned long)(base) + 2) & (3 << baddr)) + 1;	\
+	w *= (readw((base) + 2) & (3 << baddr)) + 1;		     \
 	})
 #endif
 #if defined(CONFIG_CPU_H8S)
 #define get_wait(base, addr) ({		\
 	int baddr;			\
 	baddr = ((addr) / 0x200000 * 16);			     \
-	w *= (ctrl_inl((unsigned long)(base) + 2) & (7 << baddr)) + 1;	\
+	w *= (readl((base) + 2) & (7 << baddr)) + 1;	\
 	})
 #endif
 
@@ -227,8 +228,8 @@ static __init int access_timing(void)
 
 	bsc = of_find_compatible_node(NULL, NULL, "renesas,h8300-bsc");
 	base = of_iomap(bsc, 0);
-	w = (ctrl_inb((unsigned long)base + 0) & bit)?2:1;
-	if (ctrl_inb((unsigned long)base + 1) & bit)
+	w = (readb(base + 0) & bit)?2:1;
+	if (readb(base + 1) & bit)
 		w *= get_wait(base, addr);
 	else
 		w *= 2;
@@ -252,4 +253,5 @@ void __init calibrate_delay(void)
 void __init time_init(void)
 {
 	of_clk_init(NULL);
+	clocksource_probe();
 }
diff --git a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c
index 380fffd081b2..ad1f81f574e5 100644
--- a/arch/h8300/kernel/signal.c
+++ b/arch/h8300/kernel/signal.c
@@ -95,7 +95,7 @@ restore_sigcontext(struct sigcontext *usc, int *pd0)
 	regs->ccr |= ccr;
 	regs->orig_er0 = -1;		/* disable syscall checks */
 	err |= __get_user(usp, &usc->sc_usp);
-	wrusp(usp);
+	regs->sp = usp;
 
 	err |= __get_user(er0, &usc->sc_er0);
 	*pd0 = er0;
@@ -180,7 +180,7 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 		return -EFAULT;
 
 	/* Set up to return from userspace.  */
-	ret = frame->retcode;
+	ret = (unsigned char *)&frame->retcode;
 	if (ksig->ka.sa.sa_flags & SA_RESTORER)
 		ret = (unsigned char *)(ksig->ka.sa.sa_restorer);
 	else {
@@ -196,8 +196,8 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
 		return -EFAULT;
 
 	/* Set up registers for signal handler */
-	wrusp((unsigned long) frame);
-	regs->pc  = (unsigned long) ksig->ka.sa.sa_handler;
+	regs->sp  = (unsigned long)frame;
+	regs->pc  = (unsigned long)ksig->ka.sa.sa_handler;
 	regs->er0 = ksig->sig;
 	regs->er1 = (unsigned long)&(frame->info);
 	regs->er2 = (unsigned long)&frame->uc;
diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c
index 1b2d7cdd6591..044a36125846 100644
--- a/arch/h8300/kernel/traps.c
+++ b/arch/h8300/kernel/traps.c
@@ -125,17 +125,18 @@ void show_stack(struct task_struct *task, unsigned long *esp)
 
 	pr_info("Stack from %08lx:", (unsigned long)stack);
 	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0)
+		if (((unsigned long)stack & (THREAD_SIZE - 1)) >=
+		    THREAD_SIZE-4)
 			break;
 		if (i % 8 == 0)
-			pr_info("\n       ");
-		pr_info(" %08lx", *stack++);
+			pr_info(" ");
+		pr_cont(" %08lx", *stack++);
 	}
 
-	pr_info("\nCall Trace:");
+	pr_info("\nCall Trace:\n");
 	i = 0;
 	stack = esp;
-	while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) {
+	while (((unsigned long)stack & (THREAD_SIZE - 1)) < THREAD_SIZE-4) {
 		addr = *stack++;
 		/*
 		 * If the address is either in the text segment of the
@@ -147,15 +148,10 @@ void show_stack(struct task_struct *task, unsigned long *esp)
 		 */
 		if (check_kernel_text(addr)) {
 			if (i % 4 == 0)
-				pr_info("\n       ");
-			pr_info(" [<%08lx>]", addr);
+				pr_info("       ");
+			pr_cont(" [<%08lx>]", addr);
 			i++;
 		}
 	}
 	pr_info("\n");
 }
-
-void show_trace_task(struct task_struct *tsk)
-{
-	show_stack(tsk, (unsigned long *)tsk->thread.esp0);
-}
diff --git a/arch/h8300/kernel/vmlinux.lds.S b/arch/h8300/kernel/vmlinux.lds.S
index 7c302dcf5249..cb5dfb02c88d 100644
--- a/arch/h8300/kernel/vmlinux.lds.S
+++ b/arch/h8300/kernel/vmlinux.lds.S
@@ -1,5 +1,6 @@
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/page.h>
+#include <asm/thread_info.h>
 
 #define ROMTOP 0x000000
 #define RAMTOP 0x400000
@@ -42,11 +43,10 @@ SECTIONS
 	. = RAMTOP;
 	_ramstart = .;
 #define ADDR(x) ROMEND
-#else
 #endif
 	_sdata = . ;
 	__data_start = . ;
-	RW_DATA_SECTION(0,0,0)
+	RW_DATA_SECTION(0, PAGE_SIZE, THREAD_SIZE)
 #if defined(CONFIG_ROMKERNEL)
 #undef ADDR
 #endif