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Add framework for UART support

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@704 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-02-18 16:27:25 +00:00
parent 95a8c0619f
commit 0a80114f9e
7 changed files with 1058 additions and 6 deletions
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6
arch/z80/src/common/up_initialize.c
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@ -154,7 +154,13 @@ void up_initialize(void)
/* Initialize the serial device driver */
#ifdef CONFIG_USE_SERIALDRIVER
up_serialinit();
#endif
#ifdef CONFIG_USE_LOWCONSOLE
lowconsole_init();
#endif
/* Initialize the netwok */

21
arch/z80/src/common/up_internal.h
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@ -50,6 +50,8 @@
#undef CONFIG_SUPPRESS_SERIAL_INTS /* Console will poll */
#undef CONFIG_SUPPRESS_UART_CONFIG /* Do not reconfig UART */
#undef CONFIG_DUMP_ON_EXIT /* Dump task state on exit */
#undef CONFIG_Z80_LOWPUTC /* Support up_lowputc for debug */
#undef CONFIG_Z80_LOWGETC /* support up_lowgetc for debug */
/****************************************************************************
* Included Files
@ -63,6 +65,17 @@
* Definitions
****************************************************************************/
/* Determine which (if any) console driver to use */
#if defined(CONFIG_Z80_LOWPUTC) || defined(CONFIG_Z80_LOWGETC) || \
CONFIG_NFILE_DESCRIPTORS == 0 || defined(CONFIG_DEV_LOWCONSOLE)
# define CONFIG_USE_LOWCONSOLE 1
# define CONFIG_USE_LOWUARTINIT 1
#elif defined(CONFIG_DEV_CONSOLE) && CONFIG_NFILE_DESCRIPTORS > 0
# define CONFIG_USE_SERIALDRIVER 1
# define CONFIG_USE_EARLYSERIALINIT 1
#endif
/****************************************************************************
* Public Types
****************************************************************************/
@ -106,7 +119,7 @@ void up_addregion(void);
/* Defined in up_serial.c */
#if CONFIG_NFILE_DESCRIPTORS > 0
#ifdef CONFIG_USE_SERIALDRIVER
EXTERN void up_earlyserialinit(void);
EXTERN void up_serialinit(void);
#else
@ -114,6 +127,12 @@ EXTERN void up_serialinit(void);
# define up_serialinit()
#endif
#ifdef CONFIG_USE_LOWCONSOLE
EXTERN void lowconsole_init(void);
#else
# define lowconsole_init()
#endif
/* Defined in up_timerisr.c */
EXTERN void up_timerinit(void);

4
arch/z80/src/z8/Make.defs
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@ -42,8 +42,8 @@ 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_SSRCS = z8_vector.S z8_saveusercontext.S z8_restorecontext.S
CHIP_SSRCS = z8_lowuart.S z8_vector.S z8_saveusercontext.S z8_restorecontext.S
CHIP_CSRCS = z8_initialstate.c z8_irq.c z8_saveirqcontext.c \
z8_schedulesigaction.c z8_sigdeliver.c z8_timerisr.c \
z8_registerdump.c
z8_serial.c z8_registerdump.c

67
arch/z80/src/z8/chip.h
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@ -97,6 +97,73 @@
#define Z8_TIMERCTL_GATED _HX(06)
#define Z8_TIMERCTL_CAPCMP _HX(07)
/* UART Register Offsets *************************************************************/
#define Z8_UART_TXD _HX(00) /* 8-bits: UART Transmit Data */
#define Z8_UART_RXD _HX(00) /* 8-bits: UART Receive Data */
#define Z8_UART_STAT0 _HX(01) /* 8-bits: UART Status 0 */
#define Z8_UART_CTL _HX(02) /* 16-bits: UART Control */
#define Z8_UART_CTL0 _HX(02) /* 8-bits: UART Control 0 */
#define Z8_UART_CTL1 _HX(03) /* 8-bits: UART COntrol 1 */
#if defined(_Z8FMC16) || defined(_Z8F1680)
# define Z8_UART_MDSTAT _HX(04) /* 8-bits: UART Mode Select & Status */
#else
# define Z8_UART_STAT1 _HX(04) /* 8-bits: UART Status 1 */
#endif
#define Z8_UART_ADDR _HX(05) /* 8-bits: UART Address Compare */
#define Z8_UART_BR _HX(06) /* 16-bits: UART Baud Rate */
#define Z8_UART_BRH _HX(06) /* 8-bits: UART Baud Rate High Byte */
#define Z8_UART_BRL _HX(07) /* 8-bits: UART Baud Rate Low Byte */
/* UART0/1 Base Register Addresses **************************************************/
#ifdef EZ8_UART0
# define Z8_UART0_BASE ((ubyte volatile far*)0xf40)
#endif
#ifdef EZ8_UART1
# define Z8_UART1_BASE ((ubyte volatile far*)0xf48)
#endif
/* UART0/1 Status 0 Register Bit Definitions ****************************************/
#define Z8_UARTSTAT0_RDA _HX(80) /* Bit 7: Receive Data Available */
#define Z8_UARTSTAT0_PE _HX(40) /* Bit 6: Parity Error */
#define Z8_UARTSTAT0_OE _HX(20) /* Bit 5: Overrun Error */
#define Z8_UARTSTAT0_FE _HX(10) /* Bit 4: Framing Error */
#define Z8_UARTSTAT0_BRKD _HX(08) /* Bit 3: Break Detect */
#define Z8_UARTSTAT0_TDRE _HX(04) /* Bit 2: Transmitter Data Register Empty */
#define Z8_UARTSTAT0_TXE _HX(02) /* Bit 1: Transmitter Empty */
#define Z8_UARTSTAT0_CTS _HX(01) /* Bit 0: Clear To Send */
/* UART0/1 Control 0/1 Register Bit Definitions *************************************/
#define Z8_UARTCTL0_TEN _HX(80) /* Bit 7: Transmit Enable */
#define Z8_UARTCTL0_REN _HX(40) /* Bit 6: Receive Enable */
#define Z8_UARTCTL0_CTSE _HX(20) /* Bit 5: CTS Enable */
#define Z8_UARTCTL0_PEN _HX(10) /* Bit 4: Parity Enable */
#define Z8_UARTCTL0_PSEL _HX(08) /* Bit 3: Odd Parity Select */
#define Z8_UARTCTL0_SBRK _HX(04) /* Bit 2: Send Break */
#define Z8_UARTCTL0_STOP _HX(02) /* Bit 1: Stop Bit Select */
#define Z8_UARTCTL0_LBEN _HX(01) /* Bit 0: Loopback Enable */
#define Z8_UARTCTL1_MPMD1 _HX(80) /* Bit 7: Multiprocessor Mode (bit1) */
#define Z8_UARTCTL1_MPEN _HX(40) /* Bit 6: Multiprocessor Enable */
#define Z8_UARTCTL1_MPMD0 _HX(20) /* Bit 5: Multiprocessor Mode (bit0) */
#define Z8_UARTCTL1_MPBT _HX(10) /* Bit 4: Multiprocessor Bit Transmit */
#define Z8_UARTCTL1_DEPOL _HX(08) /* Bit 3: Driver Enable Polarity */
#define Z8_UARTCTL1_BRGCTL _HX(04) /* Bit 2: Baud Rate Generator Control */
#define Z8_UARTCTL1_RDAIRQ _HX(02) /* Bit 1: Receive Data Interrupt Enable */
#define Z8_UARTCTL1_IREN _HX(01) /* Bit 0: Infrared Encoder/Decoder Eanble */
/* UART0/1 Mode Status/Select Register Bit Definitions ******************************/
#define Z8_UARTMDSEL_NORMAL _HX(00) /* Bits 5-7=0: Multiprocessor and Normal Mode */
#define Z8_UARTMDSEL_FILTER HX(20) /* Bits 5-7=1: Noise Filter Control/Status */
#define Z8_UARTMDSEL_LINP HX(40) /* Bits 5-7=2: LIN protocol Contol/Status */
#define Z8_UARTMDSEL_HWREV HX(e0) /* Bits 5-7=7: LIN-UART Hardware Revision */
/* Bits 0-4: Mode dependent status */
/* Register access macros ***********************************************************
*
* The register access mechanism provided in ez8.h differs from the useful in other

8
arch/z80/src/z8/switch.h
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@ -42,9 +42,11 @@
************************************************************************************/
#include <sys/types.h>
#include <nuttx/sched.h>
#include <nuttx/arch.h>
#include "up_internal.h"
#ifndef __ASSEMBLY__
# include <nuttx/sched.h>
# include <nuttx/arch.h>
#endif
#include "common/up_internal.h"
/************************************************************************************
* Definitions

156
arch/z80/src/z8/z8_lowuart.S Executable file
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@ -0,0 +1,156 @@
/*************************************************************************
* arch/z80/src/z8/z8_lowuart.asm
* ez8 UART management
*
* 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.
*
*************************************************************************/
/*************************************************************************
* Included Files
*************************************************************************/
#include <nuttx/config.h>
#include "chip/chip.h"
#include "common/up_internal.h"
#ifdef CONFIG_USE_LOWUARTINIT
/*************************************************************************
* External References / External Definitions
*************************************************************************/
xdef _z8_lowuartinit
#ifdef CONFIG_Z80_LOWPUTC
xdef _up_lowputc
#endif
#ifdef CONFIG_Z80_LOWGETC
xdef _up_lowgetc
#endif
/*************************************************************************
* Data Allocation
*************************************************************************/
define CODESEG, SPACE=ROM
segment CODESEG
/*************************************************************************
* Code
*************************************************************************/
/*************************************************************************
* Name: z8_lowuartinit
*
* Description:
* Initialize UART0 or UART1
*
* Parameters:
* None
*
*************************************************************************/
_z8_lowuartinit:
#endif /* CONFIG_USE_LOWUARTINIT */
/*************************************************************************
* Name: _up_lowputc
*
* Description:
* Send one character to the selected serial console
*
* Parmeters:
* r1 = character
*
* Return:
* None
*
* Modifies r0 (and maybe r1)
*
*************************************************************************/
#ifdef CONFIG_Z80_LOWPUTC
_up_lowputc:
/* Check if the character to output is a linefeed */
/* Output a carriage return before the linefeed */
/*************************************************************************
* Name: _z8_xmitc
*
* Description:
* Send one character on the selected port (really a part of up_lowputc)
*
* Parameters:
* r1 = character
*
* Return:
* None
*
* Modifies r0
*
*************************************************************************/
_z8_xmitc:
_z8_xmitc1:
#ifdef CONFIG_UART1_SERIAL_CONSOLE
#else
#endif
ret /* Return */
#endif /* CONFIG_Z80_LOWPUTC */
/*************************************************************************
* Name: _up_lowgetc
*
* Description:
* Get a character from the serial port
*
* Parmeters:
* None
*
* Return
* R0 = Character read
*
*************************************************************************/
#ifdef CONFIG_Z80_LOWGETC
_up_lowgetc:
_up_lowgetc1:
#ifdef CONFIG_UART1_SERIAL_CONSOLE
#else
#endif
#endif
end

802
arch/z80/src/z8/z8_serial.c Executable file
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@ -0,0 +1,802 @@
/****************************************************************************
* arch/z80/src/z8/z8_serial.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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <unistd.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <ez8.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/serial.h>
#include <arch/serial.h>
#include "chip/chip.h"
#include "os_internal.h"
#include "up_internal.h"
#ifdef CONFIG_USE_SERIALDRIVER
/****************************************************************************
* Definitions
****************************************************************************/
/* System clock frequency value from ZDS target settings */
#define STATE_DISABLED 0
#define STATE_RXENABLED 1
#define STATE_TXENABLED 2
/****************************************************************************
* Private Types
****************************************************************************/
struct z8_uart_s
{
(ubyte volatile far*) uartbase; /* Base address of UART
* registers */
uint32 baud; /* Configured baud */
boolean rxenabled; /* RX interrupt enabled */
boolean txenabled; /* TX interrupt enabled */
ubyte rxirq; /* RX IRQ associated with this UART */
ubyte txirq; /* RX IRQ associated with this UART */
ubyte parity; /* 0=none, 1=odd, 2=even */
boolean stopbits2; /* TRUE: Configure with 2
* stop bits instead of 1 */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int z8_setup(struct uart_dev_s *dev);
static void z8_shutdown(struct uart_dev_s *dev);
static int z8_attach(struct uart_dev_s *dev);
static void z8_detach(struct uart_dev_s *dev);
static int z8_rxinterrupt(int irq, void *context);
static int z8_txinterrupt(int irq, void *context);
static int z8_ioctl(struct file *filep, int cmd, unsigned long arg);
static int z8_receive(struct uart_dev_s *dev, uint32 *status);
static void z8_rxint(struct uart_dev_s *dev, boolean enable);
static boolean z8_rxavailable(struct uart_dev_s *dev);
static void z8_send(struct uart_dev_s *dev, int ch);
static void z8_txint(struct uart_dev_s *dev, boolean enable);
static boolean z8_txready(struct uart_dev_s *dev);
static boolean z8_txempty(struct uart_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
struct uart_ops_s g_uart_ops =
{
z8_setup, /* setup */
z8_shutdown, /* shutdown */
z8_attach, /* attach */
z8_detach, /* detach */
z8_ioctl, /* ioctl */
z8_receive, /* receive */
z8_rxint, /* rxint */
z8_rxavailable, /* rxavailable */
z8_send, /* send */
z8_txint, /* txint */
z8_txready, /* txready */
z8_txempty /* txempty */
};
/* I/O buffers */
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
/* This describes the state of the DM320 uart0 port. */
static struct z8_uart_s g_uart0priv =
{
Z8_UART0_BASE, /* uartbase */
CONFIG_UART0_BAUD, /* baud */
FALSE, /* rxenabled */
FALSE, /* txenabled */
Z8_IRQ_UART0RX, /* rxirq */
Z8_IRQ_UART0TX, /* txirq */
CONFIG_UART0_PARITY, /* parity */
CONFIG_UART0_2STOP /* stopbits2 */
};
static uart_dev_t g_uart0port =
{
0, /* open_count */
FALSE, /* xmitwaiting */
FALSE, /* recvwaiting */
#ifdef CONFIG_UART0_SERIAL_CONSOLE
TRUE, /* isconsole */
#else
FALSE, /* isconsole */
#endif
{ 0 }, /* closesem */
{ 0 }, /* xmitsem */
{ 0 }, /* recvsem */
{
{ 0 }, /* xmit.sem */
0, /* xmit.head */
0, /* xmit.tail */
CONFIG_UART0_TXBUFSIZE, /* xmit.size */
g_uart0txbuffer, /* xmit.buffer */
},
{
{ 0 }, /* recv.sem */
0, /* recv.head */
0, /* recv.tail */
CONFIG_UART0_RXBUFSIZE, /* recv.size */
g_uart0rxbuffer, /* recv.buffer */
},
&g_uart_ops, /* ops */
&g_uart0priv, /* priv */
};
/* This describes the state of the DM320 uart1 port. */
static struct z8_uart_s g_uart1priv =
{
Z8_UART1_BASE, /* uartbase */
CONFIG_UART1_BAUD, /* baud */
FALSE, /* rxenabled */
FALSE, /* txenabled */
Z8_IRQ_UART1RX, /* rxirq */
Z8_IRQ_UART1TX, /* txirq */
CONFIG_UART1_PARITY, /* parity */
CONFIG_UART1_2STOP /* stopbits2 */
};
static uart_dev_t g_uart1port =
{
0, /* open_count */
FALSE, /* xmitwaiting */
FALSE, /* recvwaiting */
#ifdef CONFIG_UART1_SERIAL_CONSOLE
TRUE, /* isconsole */
#else
FALSE, /* isconsole */
#endif
{ 0 }, /* closesem */
{ 0 }, /* xmitsem */
{ 0 }, /* recvsem */
{
{ 0 }, /* xmit.sem */
0, /* xmit.head */
0, /* xmit.tail */
CONFIG_UART1_TXBUFSIZE, /* xmit.size */
g_uart1txbuffer, /* xmit.buffer */
},
{
{ 0 }, /* recv.sem */
0, /* recv.head */
0, /* recv.tail */
CONFIG_UART0_RXBUFSIZE, /* recv.size */
g_uart0rxbuffer, /* recv.buffer */
},
&g_uart_ops, /* ops */
&g_uart1priv, /* priv */
};
/* Now, which one with be tty0/console and which tty1? */
#ifdef CONFIG_UART1_SERIAL_CONSOLE
# define CONSOLE_DEV g_uart1port
# define TTYS0_DEV g_uart1port
# define TTYS1_DEV g_uart0port
#else
# define CONSOLE_DEV g_uart0port
# define TTYS0_DEV g_uart0port
# define TTYS1_DEV g_uart1port
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: z8_disableuartirq
****************************************************************************/
static ubyte z8_disableuartirq(struct uart_dev_s *dev)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
irqstate_t flags = irqsave();
ubyte state = priv->rxenabled ? STATE_RXENABLED : STATE_DISABLED | \
priv->txenabled ? STATE_TXENABLED : STATE_DISABLED;
z8_txint(dev, FALSE);
z8_rxint(dev, FALSE);
irqrestore(flags);
return state;
}
/****************************************************************************
* Name: z8_restoreuartirq
****************************************************************************/
static void z8_restoreuartirq(struct uart_dev_s *dev, ubyte state)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
irqstate_t flags = irqsave();
z8_txint(dev, (state & STATE_TXENABLED) ? TRUE : FALSE);
z8_rxint(dev, (state & STATE_RXENABLED) ? TRUE : FALSE);
irqrestore(flags);
}
/****************************************************************************
* Name: z8_consoleput
****************************************************************************/
static void z8_consoleput(ubyte ch)
{
struct z8_uart_s *priv = (struct z8_uart_s*)CONSOLE_DEV.priv;
int tmp;
for (tmp = 1000 ; tmp > 0 ; tmp--)
{
if (z8_txready(&CONSOLE_DEV))
{
break;
}
}
putreg8(ch, priv->uartbase + Z8_UART_TXD);
}
/****************************************************************************
* Name: z8_setup
*
* Description:
* Configure the UART baud, parity, etc. This method is called the first
* time that the serial port is opened.
*
****************************************************************************/
static int z8_setup(struct uart_dev_s *dev)
{
#ifndef CONFIG_SUPPRESS_UART_CONFIG
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
uint32 brg;
ubyte ctl0;
ubyte ctl1;
/* Calculate and set the baud rate generation register.
* BRG = (freq + baud * 8)/(baud * 16)
*/
brg = (_DEFCLK + (priv->baud << 3))/(priv->baud << 4);
putreg16((uint16)brg, priv->uartbase + Z8_UART_BR);
/* Configure STOP bits */
ctl0 = ctl1 = 0;
if (priv->stopbits2)
{
ctl0 |= Z8_UARTCTL0_STOP;
}
/* Configure parity */
if (priv->parity == 1)
{
ctl0 |= (Z8_UARTCTL0_PEN|Z8_UARTCTL0_PSEL);
}
else if (priv->parity == 2)
{
ctl0 |= Z8_UARTCTL0_PEN;
}
putreg8(ctl0, priv->uartbase + Z8_UART_CTL0);
putreg8(ctl1, priv->uartbase + Z8_UART_CTL1);
/* Enable UART receive (REN) and transmit (TEN) */
ctl0 |= (Z8_UARTCTL0_TEN|Z8_UARTCTL0_REN);
putreg8(ctl0, priv->uartbase + Z8_UART_CTL0);
#endif
return OK;
}
/****************************************************************************
* Name: z8_shutdown
*
* Description:
* Disable the UART. This method is called when the serial
* port is closed
*
****************************************************************************/
static void z8_shutdown(struct uart_dev_s *dev)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
(void)z8_disableuartirq(dev);
}
/****************************************************************************
* Name: z8_attach
*
* Description:
* Configure the UART to operation in interrupt driven mode. This method is
* called when the serial port is opened. Normally, this is just after the
* the setup() method is called, however, the serial console may operate in
* a non-interrupt driven mode during the boot phase.
*
* RX and TX interrupts are not enabled when by the attach method (unless the
* hardware supports multiple levels of interrupt enabling). The RX and TX
* interrupts are not enabled until the txint() and rxint() methods are called.
*
****************************************************************************/
static int z8_attach(struct uart_dev_s *dev)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
int ret;
/* Attach the RX IRQ */
ret = irq_attach(priv->rxirq, z8_rxinterrupt);
if (ret == OK)
{
/* Attach the TX IRQ */
ret = irq_attach(priv->txirq, z8_txinterrupt);
if (ret != OK)
{
irq_detach(priv->rxirq);
}
}
return ret;
}
/****************************************************************************
* Name: z8_detach
*
* Description:
* Detach UART interrupts. This method is called when the serial port is
* closed normally just before the shutdown method is called. The exception is
* the serial console which is never shutdown.
*
****************************************************************************/
static void z8_detach(struct uart_dev_s *dev)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
up_disable_irq(priv->rxirq);
up_disable_irq(priv->txirq);
irq_detach(priv->rxirq);
irq_detach(priv->txirq);
}
/****************************************************************************
* Name: z8_rxinterrupt
*
* Description:
* This is the UART interrupt handler. It will be invoked when an RX
* event occurs at the z8's LIN-UART.
*
****************************************************************************/
static int z8_rxinterrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
struct z8_uart_s *priv;
ubyte status;
if (g_uart1priv.rxirq == irq)
{
dev = &g_uart1port;
}
else if (g_uart0priv.rxirq == irq)
{
dev = &g_uart0port;
}
else
{
PANIC(OSERR_INTERNAL);
}
priv = (struct z8_uart_s*)dev->priv;
/* Check the LIN-UART status 0 register to determine whether the source of
* the interrupt is error, break, or received data
*/
status = getreg8(priv->uartbase + Z8_UART_STAT0);
/* REVISIT error and break handling */
/* Check if received data is available */
if (status & Z8_UARTSTAT0_RDA)
{
/* Handline an incoming, receive byte */
uart_recvchars(dev);
}
return OK;
}
/****************************************************************************
* Name: z8_txinterrupt
*
* Description:
* This is the UART TX interrupt handler. This interrupt handler will
* be invoked when the X16F LIN UART transmit data register is empty.
*
****************************************************************************/
static int z8_txinterrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
struct z8_uart_s *priv;
ubyte status;
if (g_uart1priv.txirq == irq)
{
dev = &g_uart1port;
}
else if (g_uart0priv.txirq == irq)
{
dev = &g_uart0port;
}
else
{
PANIC(OSERR_INTERNAL);
}
priv = (struct z8_uart_s*)dev->priv;
/* Verify that the transmit data register is empty */
status = getreg8(priv->uartbase + Z8_UART_STAT0);
if (status & Z8_UARTSTAT0_TDRE)
{
/* Handle outgoing, transmit bytes */
uart_xmitchars(dev);
}
return OK;
}
/****************************************************************************
* Name: z8_ioctl
*
* Description:
* All ioctl calls will be routed through this method
*
****************************************************************************/
static int z8_ioctl(struct file *filep, int cmd, unsigned long arg)
{
*get_errno_ptr() = ENOTTY;
return ERROR;
}
/****************************************************************************
* Name: z8_receive
*
* Description:
* Called (usually) from the interrupt level to receive one character from
* the UART. Error bits associated with the receipt are provided in the
* return 'status'.
*
****************************************************************************/
static int z8_receive(struct uart_dev_s *dev, uint32 *status)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
ubyte rxd;
ubyte stat0;
rxd = getreg8(priv->uartbase + Z8_UART_RXD);
stat0 = getreg8(priv->uartbase + Z8_UART_STAT0);
*status = (uint32)rxd | (((uint32)stat0) << 8);
return rxd;
}
/****************************************************************************
* Name: z8_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void z8_rxint(struct uart_dev_s *dev, boolean enable)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
irqstate_t flags = irqsave();
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
up_enable_irq(priv->rxirq);
#endif
}
else
{
up_disable_irq(priv->rxirq);
}
priv->rxenabled = enable;
irqrestore(flags);
}
/****************************************************************************
* Name: z8_rxavailable
*
* Description:
* Return TRUE if the receive fifo is not empty
*
****************************************************************************/
static boolean z8_rxavailable(struct uart_dev_s *dev)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
return ((getreg8(priv->uartbase + Z8_UART_STAT0) & Z8_UARTSTAT0_RDA) != 0);
}
/****************************************************************************
* Name: z8_send
*
* Description:
* This method will send one byte on the UART
*
****************************************************************************/
static void z8_send(struct uart_dev_s *dev, int ch)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
putreg8(ch, priv->uartbase + Z8_UART_TXD);
}
/****************************************************************************
* Name: z8_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void z8_txint(struct uart_dev_s *dev, boolean enable)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
irqstate_t flags = irqsave();
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
up_enable_irq(priv->txirq);
#endif
}
else
{
up_disable_irq(priv->txirq);
}
priv->txenabled = enable;
irqrestore(flags);
}
/****************************************************************************
* Name: z8_txready
*
* Description:
* Return TRUE if the tranmsit fifo is not full
*
****************************************************************************/
static boolean z8_txready(struct uart_dev_s *dev)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
return ((getreg8(priv->uartbase + Z8_UART_STAT0) & Z8_UARTSTAT0_TDRE) != 0);
}
/****************************************************************************
* Name: z8_txempty
*
* Description:
* Return TRUE if the transmit fifo is empty
*
****************************************************************************/
static boolean z8_txempty(struct uart_dev_s *dev)
{
struct z8_uart_s *priv = (struct z8_uart_s*)dev->priv;
return ((getreg8(priv->uartbase + Z8_UART_STAT0) & Z8_UARTSTAT0_TXE) != 0);
}
/****************************************************************************
* Public Funtions
****************************************************************************/
/****************************************************************************
* Name: up_earlyserialinit
*
* Description:
* Performs the low level UART initialization early in
* debug so that the serial console will be available
* during bootup. This must be called before z8_serialinit.
*
****************************************************************************/
void up_earlyserialinit(void)
{
(void)z8_disableuartirq(&TTYS0_DEV);
(void)z8_disableuartirq(&TTYS1_DEV);
CONSOLE_DEV.isconsole = TRUE;
z8_setup(&CONSOLE_DEV);
}
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
(void)uart_register("/dev/console", &CONSOLE_DEV);
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
(void)uart_register("/dev/ttyS1", &TTYS1_DEV);
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug
* writes
*
****************************************************************************/
int up_putc(int ch)
{
ubyte state;
/* Keep interrupts disabled so that we do not interfere with normal
* driver operation
*/
state = z8_disableuartirq(&CONSOLE_DEV);
/* Check for LF */
if (ch == '\n')
{
/* Add CR before LF */
z8_consoleput('\r');
}
/* Output the character */
z8_consoleput((ubyte)ch);
/* It is important to restore the TX interrupt while the send is pending.
* otherwise, TRDE interrupts can be lost since they do not pend after the
* TRDE false->true transition.
*/
z8_restoreuartirq(&CONSOLE_DEV, state);
return ch;
}
#else /* CONFIG_USE_SERIALDRIVER */
/****************************************************************************
* Definitions
****************************************************************************/
#ifdef CONFIG_UART1_SERIAL_CONSOLE
# define z8_contrde() \
((getreg8(*(Z8_UART1_BASE+Z8_UART_STAT0)) & Z8_UARTSTAT0_TDRE) != 0)
# define z8_contxd(ch) \
putreg8((ubyte)(ch), *(Z8_UART1_BASE+Z8_UART_TXD))
#else
# define z8_contrde() \
((getreg8(*(Z8_UART0_BASE+Z8_UART_STAT0)) & Z8_UARTSTAT0_TDRE) != 0)
# define z8_contxd(ch) \
putreg8((ubyte)(ch), *(Z8_UART0_BASE+Z8_UART_TXD))
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: z8_putc
****************************************************************************/
static void z8_putc(int ch)
{
int tmp;
for (tmp = 1000 ; tmp > 0 && !z8_contrde(); tmp--);
z8_contxd(ch);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_putc
****************************************************************************/
int up_putc(int ch)
{
/* Check for LF */
if (ch == '\n')
{
/* Output CR before LF */
z8_putc('\r');
}
/* Output character */
z8_putc(ch);
return ch;
}
#endif /* CONFIG_USE_SERIALDRIVER */