Fix access to ez80 I/O address space

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@748 42af7a65-404d-4744-a932-0658087f49c3

10 files changed, 315 insertions, 97 deletions

diff --git a/nuttx/arch/z80/include/ez80/io.h b/nuttx/arch/z80/include/ez80/io.h
new file mode 100644
index 000000000..84ba3f965
--- /dev/null
+++ b/nuttx/arch/z80/include/ez80/io.h
@@ -0,0 +1,87 @@
+/****************************************************************************
+ * arch/z80/include/ez80/io.h
+ * arch/chip/io.h
+ *
+ *   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* This file should never be included directed but, rather, only indirectly
+ * through arch/io.h
+ */
+
+#ifndef __ARCH_EZ80_IO_H
+#define __ARCH_EZ80_IO_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Inline functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+EXTERN void outp(uint16 p, ubyte c);
+EXTERN ubyte inp(uint16 p);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#endif /* __ARCH_EZ80_IO_H */
diff --git a/nuttx/arch/z80/src/ez80/Make.defs b/nuttx/arch/z80/src/ez80/Make.defs
index 40a7469cb..9273735e1 100644
--- a/nuttx/arch/z80/src/ez80/Make.defs
+++ b/nuttx/arch/z80/src/ez80/Make.defs
@@ -43,7 +43,7 @@ CMN_CSRCS	= up_initialize.c up_allocateheap.c up_createstack.c \
 		  up_reprioritizertr.c up_idle.c up_assert.c up_doirq.c \
 		  up_mdelay.c up_udelay.c up_usestack.c
 
-CHIP_ASRCS	= ez80_startup.asm ez80_irqsave.asm \
+CHIP_ASRCS	= ez80_startup.asm ez80_io.asm ez80_irqsave.asm \
 		  ez80_saveusercontext.asm ez80_restorecontext.asm
 ifeq ($(CONFIG_ARCH_CHIP_EZ80F91),y)
 CHIP_ASRCS	+= ez80f91_init.asm
diff --git a/nuttx/arch/z80/src/ez80/chip.h b/nuttx/arch/z80/src/ez80/chip.h
index 82aed0495..ef1f68759 100644
--- a/nuttx/arch/z80/src/ez80/chip.h
+++ b/nuttx/arch/z80/src/ez80/chip.h
@@ -251,19 +251,6 @@
 #define EZ80_UARTMSR_DDSR      0x02         /* Bit 1: Delta on DSR input */
 #define EZ80_UARTMSR_DCTS      0x01         /* Bit 0: Delta on CTS input */
 
-/* Register access macros ***********************************************************/
-
-#ifndef __ASSEMBLY__
-
-# define getreg8(a)           (*(volatile ubyte *)(a))
-# define putreg8(v,a)         (*(volatile ubyte *)(a) = (v))
-# define getreg16(a)          (*(volatile uint16 *)(a))
-# define putreg16(v,a)        (*(volatile uint16 *)(a) = (v))
-# define getreg32(a)          (*(volatile uint32 *)(a))
-# define putreg32(v,a)        (*(volatile uint32 *)(a) = (v))
-
-#endif
-
 /************************************************************************************
  * Public Function Prototypes
  ************************************************************************************/
diff --git a/nuttx/arch/z80/src/ez80/ez80_io.asm b/nuttx/arch/z80/src/ez80/ez80_io.asm
new file mode 100644
index 000000000..86af3b3e8
--- /dev/null
+++ b/nuttx/arch/z80/src/ez80/ez80_io.asm
@@ -0,0 +1,154 @@
+;**************************************************************************
+; arch/z80/src/ze80/ez80_io.c
+;
+;   Copyright (C) 2008 Gregory Nutt. All rights reserved.
+;   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+;
+; Redistribution and use in source and binary forms, with or without
+; modification, are permitted provided that the following conditions
+; are met:
+;
+; 1. Redistributions of source code must retain the above copyright
+;    notice, this list of conditions and the following disclaimer.
+; 2. Redistributions in binary form must reproduce the above copyright
+;    notice, this list of conditions and the following disclaimer in
+;    the documentation and/or other materials provided with the
+;    distribution.
+; 3. Neither the name NuttX nor the names of its contributors may be
+;    used to endorse or promote products derived from this software
+;    without specific prior written permission.
+;
+; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+; FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+; COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+; BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+; OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+; AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+; ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+; POSSIBILITY OF SUCH DAMAGE.
+;
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Imported
+;**************************************************************************
+
+;**************************************************************************
+; Global Symbols Expported
+;**************************************************************************
+
+	xdef	_outp
+	xdef	_inp
+
+;**************************************************************************
+; Global Symbols Expported
+;**************************************************************************
+
+	CONFIG_EZ80_Z80MODE equ 0
+
+;**************************************************************************
+; Code
+;**************************************************************************
+
+	segment CODE
+	.assume ADL=1
+
+;**************************************************************************
+; Name: void outp(uint16 p, ubyte c)
+;
+; Description:
+;   Output byte c on port p
+;
+;**************************************************************************
+
+_outp:
+	; Create a stack frame
+
+	push	ix
+	ld	ix, #0
+	add	ix, sp
+
+	; Get the arguments from the stack
+
+	.if CONFIG_EZ80_Z80MODE
+	; Stack looks like:
+	;
+	;	7-8	Unused
+	;	 6	Value
+	;	4-5	Port
+	;	2-3	Return address
+	; SP:	0-1	Caller's fame pointer
+
+	ld	bc, (ix + 4)	; Port
+	ld	a, (ix + 6)	; Value
+
+	.else
+	; Stack looks like:
+	;
+	;	10-11	Unused
+	;	 9	Value
+	;	 8	Unused
+	;	6-7	Port
+	;	3-5	Return address
+	; SP:	0-2	Caller's frame pointer
+
+	ld	bc, (ix + 6)	; Port (upper 8 bits not used)
+	ld	a, (ix + 9)	; Value
+
+	.endif
+
+	; Output the specified by to the specified 8-bit I/O address
+
+	out	(bc), a
+	pop	ix
+	ret
+
+;**************************************************************************
+; Name: ubyte inp(uint16 p)
+;
+; Description:
+;   Input byte from port p
+;
+;**************************************************************************
+
+_inp:
+	; Create a stack frame
+
+	push	ix
+	ld	ix, #0
+	add	ix, sp
+
+	; Get the arguments from the stack
+
+	.if CONFIG_EZ80_Z80MODE
+	; Stack looks like:
+	;
+	;	4-5	Port
+	;	2-3	Return address
+	; SP:	0-1	Caller's fame pointer
+
+	ld	bc, (ix + 4)	; Port
+
+	.else
+	; Stack looks like:
+	;
+	;	 8	Unused
+	;	6-7	Port
+	;	3-5	Return address
+	; SP:	0-2	Caller's frame pointer
+
+	ld	bc, (ix + 6)	; Port (upper 8 bits not used)
+
+	.endif
+
+	; Return port value in A
+
+	in	a, (bc)
+	pop	ix
+	ret
+
+	end
diff --git a/nuttx/arch/z80/src/ez80/ez80_irq.c b/nuttx/arch/z80/src/ez80/ez80_irq.c
index d36441f5e..6e0fa71c6 100644
--- a/nuttx/arch/z80/src/ez80/ez80_irq.c
+++ b/nuttx/arch/z80/src/ez80/ez80_irq.c
@@ -91,34 +91,35 @@ void up_irqinitialize(void)
  * Name: up_disable_irq
  *
  * Description:
- *   Disable the IRQ specified by 'irq'
+ *   On many architectures, there are three levels of interrupt enabling: (1)
+ *   at the global level, (2) at the level of the interrupt controller,
+ *   and (3) at the device level.  In order to receive interrupts, they
+ *   must be enabled at all three levels.
+ *
+ *   This function implements disabling of the device specified by 'irq'
+ *   at the interrupt controller level if supported by the architecture
+ *   (irqsave() supports the global level, the device level is hardware
+ *   specific).
  *
  ****************************************************************************/
 
 void up_disable_irq(int irq)
 {
+  /* There are no ez80 interrupt controller settings to disable IRQs */
 }
 
 /****************************************************************************
  * Name: up_enable_irq
  *
  * Description:
- *   Enable the IRQ specified by 'irq'
+ *   This function implements enabling of the device specified by 'irq'
+ *   at the interrupt controller level if supported by the architecture
+ *   (irqsave() supports the global level, the device level is hardware
+ *   specific).
  *
  ****************************************************************************/
 
 void up_enable_irq(int irq)
 {
-}
-
-/****************************************************************************
- * Name: up_maskack_irq
- *
- * Description:
- *   Mask the IRQ and acknowledge it
- *
- ****************************************************************************/
-
-void up_maskack_irq(int irq)
-{
+  /* There are no ez80 interrupt controller settings to enable IRQs */
 }
diff --git a/nuttx/arch/z80/src/ez80/ez80_irqsave.asm b/nuttx/arch/z80/src/ez80/ez80_irqsave.asm
index be1381e6b..c19ef0bdd 100644
--- a/nuttx/arch/z80/src/ez80/ez80_irqsave.asm
+++ b/nuttx/arch/z80/src/ez80/ez80_irqsave.asm
@@ -51,13 +51,13 @@
 	segment CODE

 	.assume ADL=1

 

-;****************************************************************************

+;**************************************************************************

 ;* Name: irqstate_t irqsave(void)

 ;*

 ;* Description:

 ;*   Disable all interrupts; return previous interrupt state

 ;*

-;****************************************************************************

+;**************************************************************************

 

 _irqsave:

 	ld	a, i		; AF = interrupt state

@@ -66,13 +66,13 @@ _irqsave:
 	pop	hl		;

 	ret			; And return

 

-;****************************************************************************

+;**************************************************************************

 ;* Name: void irqrestore(irqstate_t flags)

 ;*

 ;* Description:

 ;*   Restore previous interrupt state

 ;*

-;****************************************************************************

+;**************************************************************************

 

 _irqrestore:

 	di			; Assume disabled

diff --git a/nuttx/arch/z80/src/ez80/ez80_lowuart.c b/nuttx/arch/z80/src/ez80/ez80_lowuart.c
index 4700bef19..bddf693a1 100644
--- a/nuttx/arch/z80/src/ez80/ez80_lowuart.c
+++ b/nuttx/arch/z80/src/ez80/ez80_lowuart.c
@@ -42,6 +42,7 @@
 #include <sys/types.h>
 #include <string.h>
 
+#include <arch/io.h>
 #include <nuttx/arch.h>
 #include <nuttx/sched.h>
 
@@ -59,9 +60,9 @@
 extern unsigned long SYS_CLK_FREQ;
 #define _DEFCLK ((unsigned long)&SYS_CLK_FREQ)
 
-#ifdef CONFIG_UART1_SERIAL_CONSOLE
-#  define ez80_getreg(offs)     getreg8((EZ80_UART1_BASE+(offs)))
-#  define ez80_putreg(val,offs) putreg8((val), (EZ80_UART1_BASE+(offs)))
+#ifdef CONFIG_UART0_SERIAL_CONSOLE
+#  define ez80_inp(offs)     inp((EZ80_UART0_BASE+(offs)))
+#  define ez80_outp(offs,val) outp((EZ80_UART0_BASE+(offs)), (val))
 #  define CONFIG_UART_BAUD      CONFIG_UART0_BAUD
 #  if CONFIG_UART0_BITS == 7
 #    define CONFIG_UART_BITS EZ80_UARTCHAR_7BITS
@@ -81,8 +82,8 @@ extern unsigned long SYS_CLK_FREQ;
 #    define CONFIG_UART_PARITY 0
 #  endif
 #else
-#  define ez80_getreg(offs)     getreg8((EZ80_UART0_BASE+(offs)))
-#  define ez80_putreg(val,offs) putreg8((val), (EZ80_UART0_BASE+(offs)))
+#  define ez80_inp(offs)     inp((EZ80_UART1_BASE+(offs)))
+#  define ez80_outp(offs.val) outp((EZ80_UART1_BASE+(offs)), (val))
 #  define CONFIG_UART_BAUD      CONFIG_UART1_BAUD
 #  if CONFIG_UART1_BITS == 7
 #    define CONFIG_UART_BITS EZ80_UARTCHAR_7BITS
@@ -131,15 +132,15 @@ static void ez80_setbaud(void)
 
    /* Set the DLAB bit to enable access to the BRG registers */
 
-   lctl = ez80_getreg(EZ80_UART_LCTL);
+   lctl = ez80_inp(EZ80_UART_LCTL);
    lctl |= EZ80_UARTLCTL_DLAB;
-   ez80_putreg(lctl, EZ80_UART_LCTL);
+   ez80_outp(EZ80_UART_LCTL, lctl);
 
-   ez80_putreg((ubyte)(brg_divisor & 0xff), EZ80_UART_BRGL);
-   ez80_putreg((ubyte)(brg_divisor >> 8), EZ80_UART_BRGH);
+   ez80_outp(EZ80_UART_BRGL, (ubyte)(brg_divisor & 0xff));
+   ez80_outp(EZ80_UART_BRGH, (ubyte)(brg_divisor >> 8));
 
    lctl &= ~EZ80_UARTLCTL_DLAB;
-   ez80_putreg(lctl, EZ80_UART_LCTL);
+   ez80_outp(EZ80_UART_LCTL, lctl);
 }
 #endif /* CONFIG_SUPPRESS_UART_CONFIG */
 
@@ -158,33 +159,33 @@ void up_lowuartinit(void)
 
   /* Disable interrupts from the UART */
 
-  reg = ez80_getreg(EZ80_UART_IER);
+  reg = ez80_inp(EZ80_UART_IER);
   reg &= ~EZ80_UARTEIR_INTMASK;
-  ez80_putreg(reg, EZ80_UART_IER);
+  ez80_outp(EZ80_UART_IER, reg);
 
   /* Set the baud rate */
 
   ez80_setbaud();
-  ez80_putreg(0, EZ80_UART_MCTL);
+  ez80_outp(EZ80_UART_MCTL, 0);
 
   /* Set the character properties */
 
-  reg = ez80_getreg(EZ80_UART_LCTL);
+  reg = ez80_inp(EZ80_UART_LCTL);
   reg &= ~EZ80_UARTLCTL_MASK;
   reg |= (CONFIG_UART_BITS | CONFIG_UART_2STOP | CONFIG_UART_PARITY);
-  ez80_putreg(reg, EZ80_UART_LCTL);
+  ez80_outp(EZ80_UART_LCTL, reg);
 
   /* Enable and flush the receive FIFO */
 
   reg = EZ80_UARTFCTL_FIFOEN;
-  ez80_putreg(reg, EZ80_UART_FCTL);
+  ez80_outp(EZ80_UART_FCTL, reg);
   reg |= (EZ80_UARTFCTL_CLRTxF|EZ80_UARTFCTL_CLRRxF);
-  ez80_putreg(reg, EZ80_UART_FCTL);
+  ez80_outp(EZ80_UART_FCTL, reg);
 
   /* Set the receive trigger level to 1 */
 
   reg |= EZ80_UARTTRIG_1;
-  ez80_putreg(reg, EZ80_UART_FCTL);
+  ez80_outp(EZ80_UART_FCTL, reg);
 #endif /* CONFIG_SUPPRESS_UART_CONFIG */
 }
 #endif /* CONFIG_USE_LOWUARTINIT */
diff --git a/nuttx/arch/z80/src/ez80/ez80_registerdump.c b/nuttx/arch/z80/src/ez80/ez80_registerdump.c
index dace6ad65..31a69679c 100644
--- a/nuttx/arch/z80/src/ez80/ez80_registerdump.c
+++ b/nuttx/arch/z80/src/ez80/ez80_registerdump.c
@@ -79,10 +79,9 @@ static void ez80_registerdump(void)
 {
   if (current_regs)
     {
-      lldbg("AF: %02x|%02x I: %02x|%02x\n",
-            (ubyte*)current_regs)[XCPT_A_OFFSET],  (ubyte*)current_regs)[XCPT_F_OFFSET],
-            (ubyte*)current_regs)[XCPT_IA_OFFSET], (ubyte*)current_regs)[XCPT_IF_OFFSET]);
 #ifdef CONFIG_EZ80_Z80MODE
+      lldbg("AF: %04x  I: %04x\n",
+            current_regs[XCPT_AF], current_regs[XCPT_I]);
       lldbg("BC: %04x DE: %04x HL: %04x\n",
             current_regs[XCPT_BC], current_regs[XCPT_DE], current_regs[XCPT_HL]);
       lldbg("IX: %04x IY: %04x\n",
@@ -90,6 +89,8 @@ static void ez80_registerdump(void)
       lldbg("SP: %04x PC: %04x\n"
             current_regs[XCPT_SP], current_regs[XCPT_PC]);
 #else
+      lldbg("AF: %06x  I: %06x\n",
+            current_regs[XCPT_AF], current_regs[XCPT_I]);
       lldbg("BC: %06x DE: %06x HL: %06x\n",
             current_regs[XCPT_BC], current_regs[XCPT_DE], current_regs[XCPT_HL]);
       lldbg("IX: %06x IY: %06x\n",
diff --git a/nuttx/arch/z80/src/ez80/ez80_serial.c b/nuttx/arch/z80/src/ez80/ez80_serial.c
index 30070f6a8..75a780153 100644
--- a/nuttx/arch/z80/src/ez80/ez80_serial.c
+++ b/nuttx/arch/z80/src/ez80/ez80_serial.c
@@ -50,6 +50,7 @@
 #include <nuttx/arch.h>
 #include <nuttx/serial.h>
 #include <arch/serial.h>
+#include <arch/io.h>
 
 #include "chip/chip.h"
 #include "os_internal.h"
@@ -72,7 +73,7 @@ extern unsigned long SYS_CLK_FREQ;
 
 struct ez80_dev_s
 {
-  unsigned int         uartbase;	/* Base address of UART registers */
+  uint16               uartbase;	/* Base address of UART registers */
   unsigned int         baud;		/* Configured baud */
   ubyte                irq;		/* IRQ associated with this UART */
   ubyte                parity;		/* 0=none, 1=odd, 2=even */
@@ -231,9 +232,9 @@ static uart_dev_t g_uart1port =
  * Name: ez80_serialin
  ****************************************************************************/
 
-static inline ubyte ez80_serialin(struct ez80_dev_s *priv, uint32 offset)
+static inline ubyte ez80_serialin(struct ez80_dev_s *priv, ubyte offset)
 {
-  return getreg8(priv->uartbase + offset);
+  return inp(priv->uartbase + offset);
 }
 
 /****************************************************************************
@@ -242,7 +243,7 @@ static inline ubyte ez80_serialin(struct ez80_dev_s *priv, uint32 offset)
 
 static inline void ez80_serialout(struct ez80_dev_s *priv, ubyte offset, ubyte value)
 {
-  putreg8(value, priv->uartbase + offset);
+  outp(priv->uartbase + offset, value);
 }
 
 /****************************************************************************
@@ -359,7 +360,7 @@ static int ez80_setup(struct uart_dev_s *dev)
 
   /* Set the baud rate */
 
-  ez80_disableuartint(priv, NULL);
+  ez80_disableuartint(priv);
   ez80_setbaud(priv, priv->baud);
   ez80_serialout(priv, EZ80_UART_MCTL, 0);
 
@@ -415,20 +416,10 @@ static void ez80_shutdown(struct uart_dev_s *dev)
 static int ez80_attach(struct uart_dev_s *dev)
 {
   struct ez80_dev_s *priv = (struct ez80_dev_s*)dev->priv;
-  int ret;
-
-  /* Attach and enable the IRQ */
 
-  ret = irq_attach(priv->irq, ez80_interrrupt);
-  if (ret == OK)
-    {
-       /* Enable the interrupt (RX and TX interrupts are still disabled
-        * in the UART
-        */
+  /* Attach the IRQ */
 
-       up_enable_irq(priv->irq);
-    }
-  return ret;
+  return irq_attach(priv->irq, ez80_interrrupt);
 }
 
 /****************************************************************************
@@ -444,7 +435,7 @@ static int ez80_attach(struct uart_dev_s *dev)
 static void ez80_detach(struct uart_dev_s *dev)
 {
   struct ez80_dev_s *priv = (struct ez80_dev_s*)dev->priv;
-  up_disable_irq(priv->irq);
+  ez80_disableuartint(priv);
   irq_detach(priv->irq);
 }
 
@@ -726,15 +717,15 @@ int up_putc(int ch)
  ****************************************************************************/
 
 #ifdef CONFIG_UART1_SERIAL_CONSOLE
-# define ez80_getreg(offs)     getreg8((EZ80_UART1_BASE+(offs)))
-# define ez80_putreg(val,offs) putreg8((val), (EZ80_UART1_BASE+(offs)))
+# define ez80_inp(offs)      inp((EZ80_UART1_BASE+(offs)))
+# define ez80_outp(offs,val) outp((EZ80_UART1_BASE+(offs)), (val))
 #else
-# define ez80_getreg(offs)     getreg8((EZ80_UART0_BASE+(offs)))
-# define ez80_putreg(val,offs) putreg8((val), (EZ80_UART0_BASE+(offs)))
+# define ez80_inp(offs)      inp((EZ80_UART0_BASE+(offs)))
+# define ez80_outp(offs,val) outp((EZ80_UART0_BASE+(offs)), (val))
 #endif
 
-#define ez80_txready() ((ez80_getreg(EZ80_UART_LSR) & EZ80_UARTLSR_THRE) != 0)
-#define ez80_send(ch)  ez80_putreg(ch, EZ80_UART_THR)
+#define ez80_txready() ((ez80_inp(EZ80_UART_LSR) & EZ80_UARTLSR_THRE) != 0)
+#define ez80_send(ch)  ez80_outp(EZ80_UART_THR, ch)
 
 /****************************************************************************
  * Private Function Prototypes
diff --git a/nuttx/arch/z80/src/ez80/ez80_timerisr.c b/nuttx/arch/z80/src/ez80/ez80_timerisr.c
index 7f371ad57..57a42cf01 100644
--- a/nuttx/arch/z80/src/ez80/ez80_timerisr.c
+++ b/nuttx/arch/z80/src/ez80/ez80_timerisr.c
@@ -42,6 +42,7 @@
 #include <sys/types.h>
 #include <debug.h>
 
+#include <arch/io.h>
 #include <nuttx/arch.h>
 
 #include "chip/chip.h"
@@ -85,11 +86,11 @@ int up_timerisr(int irq, chipreg_t *regs)
   /* Read the appropropriate timer0 registr to clear the interrupt */
   
 #ifdef _EZ80F91
-  reg = getreg8(EZ80_TMR0_IIR);
+  reg = inp(EZ80_TMR0_IIR);
 #else
   /* _EZ80190, _EZ80L92, _EZ80F92, _EZ80F93 */
 
-  reg = getreg8(EZ80_TMR0_CTL);
+  reg = inp(EZ80_TMR0_CTL);
 #endif
 
    /* Process timer interrupt */
@@ -112,13 +113,13 @@ void up_timerinit(void)
   uint16 reload;
   ubyte  reg;
 
-  /* Disable timer0 interrupts */
-
-  up_disable_irq(EZ80_IRQ_SYSTIMER);
-
   /* Disable the timer */
   
-  putreg8(0x00, EZ80_TMR0_CTL);
+  outp(EZ80_TMR0_CTL, 0x00);
+
+  /* Attach system timer interrupts */
+
+  irq_attach(EZ80_IRQ_SYSTIMER, (xcpt_t)up_timerisr);
 
   /* Set up the timer reload value */
   /* Write to the timer reload register to set the reload value.
@@ -138,35 +139,30 @@ void up_timerinit(void)
    */
 
   reload = (uint16)(_DEFCLK / 1600);
-  putreg8((ubyte)(reload >> 8), EZ80_TMR0_RRH);
-  putreg8((ubyte)(reload), EZ80_TMR0_RRL);
+  outp(EZ80_TMR0_RRH, (ubyte)(reload >> 8));
+  outp(EZ80_TMR0_RRL, (ubyte)(reload));
 
   /* Clear any pending timer interrupts */
   
 #if defined(_EZ80F91)
-  reg = getreg8(EZ80_TMR0_IIR);
+  reg = inp(EZ80_TMR0_IIR);
 #elif defined(_EZ80L92) || defined(_EZ80F92) ||defined(_EZ80F93)
-  reg = getreg8(EZ80_TMR0_CTL);
+  reg = inp(EZ80_TMR0_CTL);
 #endif
 
   /* Configure and enable the timer */
 
 #if defined(_EZ80190)
-  putreg8(0x5f, EZ80_TMR0_CTL);
+  outp(EZ80_TMR0_CTL, 0x5f);
 #elif defined(_EZ80F91)
-  putreg8((EZ80_TMRCLKDIV_16|EZ80_TMRCTL_TIMCONT|EZ80_TMRCTL_RLD|EZ80_TMRCTL_TIMEN), EZ80_TMR0_CTL);
+  outp(EZ80_TMR0_CTL, (EZ80_TMRCLKDIV_16|EZ80_TMRCTL_TIMCONT|EZ80_TMRCTL_RLD|EZ80_TMRCTL_TIMEN));
 #elif defined(_EZ80L92) || defined(_EZ80F92) ||defined(_EZ80F93)
-  putreg8(0x57, EZ80_TMR0_CTL);
+  outp(EZ80_TMR0_CTL, 0x57);
 #endif
 
 /* Enable timer end-of-count interrupts */
 
 #if defined(_EZ80F91)
-  putreg8(EZ80_TMRIER_EOCEN, EZ80_TMR0_IER);
+  outp(EZ80_TMR0_IER, EZ80_TMRIER_EOCEN);
 #endif
-
-  /* Attach and enable the timer */
-
-  irq_attach(EZ80_IRQ_SYSTIMER, (xcpt_t)up_timerisr);
-  up_enable_irq(EZ80_IRQ_SYSTIMER);
 }