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    /openrisc/trunk/rtos/ecos-2.0/packages/devs/serial/arm/cma230/v2_0/src
    from Rev 27 to Rev 174
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  •

Rev 27 → Rev 174

/cma230_serial.c
0,0 → 1,345
//==========================================================================
//
// io/serial/arm/cma230_serial.c
//
// Cogent CMA230 Serial I/O Interface Module (interrupt driven)
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 1999-02-04
// Purpose: CMA230 Serial I/O module (interrupt driven version)
// Description:
//
//####DESCRIPTIONEND####
//
//==========================================================================
 
#include <pkgconf/system.h>
#include <pkgconf/io_serial.h>
#include <pkgconf/io.h>
#include <cyg/io/io.h>
#include <cyg/hal/hal_intr.h>
#include <cyg/io/devtab.h>
#include <cyg/io/serial.h>
#include <cyg/hal/hal_cma230.h>
#include <cyg/infra/diag.h>
 
#ifdef CYGPKG_IO_SERIAL_ARM_CMA230
 
#include "cma230_serial.h"
 
typedef struct cma230_serial_info {
CYG_ADDRWORD base;
CYG_WORD int_num;
cyg_interrupt serial_interrupt;
cyg_handle_t serial_interrupt_handle;
} cma230_serial_info;
 
static bool cma230_serial_init(struct cyg_devtab_entry *tab);
static bool cma230_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo cma230_serial_lookup(struct cyg_devtab_entry **tab,
struct cyg_devtab_entry *sub_tab,
const char *name);
static unsigned char cma230_serial_getc(serial_channel *chan);
static Cyg_ErrNo cma230_serial_set_config(serial_channel *chan, cyg_uint32 key,
const void *xbuf, cyg_uint32 *len);
static void cma230_serial_start_xmit(serial_channel *chan);
static void cma230_serial_stop_xmit(serial_channel *chan);
 
static cyg_uint32 cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
 
static SERIAL_FUNS(cma230_serial_funs,
cma230_serial_putc,
cma230_serial_getc,
cma230_serial_set_config,
cma230_serial_start_xmit,
cma230_serial_stop_xmit
);
 
#ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_A
static cma230_serial_info cma230_serial_info0 = {CMA101_DUARTA,
CYGNUM_HAL_INTERRUPT_SERIAL_A};
#if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE > 0
static unsigned char cma230_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];
static unsigned char cma230_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BUFSIZE];
 
static SERIAL_CHANNEL_USING_INTERRUPTS(cma230_serial_channel0,
cma230_serial_funs,
cma230_serial_info0,
CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BAUD),
CYG_SERIAL_STOP_DEFAULT,
CYG_SERIAL_PARITY_DEFAULT,
CYG_SERIAL_WORD_LENGTH_DEFAULT,
CYG_SERIAL_FLAGS_DEFAULT,
&cma230_serial_out_buf0[0], sizeof(cma230_serial_out_buf0),
&cma230_serial_in_buf0[0], sizeof(cma230_serial_in_buf0)
);
#else
static SERIAL_CHANNEL(cma230_serial_channel0,
cma230_serial_funs,
cma230_serial_info0,
CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_A_BAUD),
CYG_SERIAL_STOP_DEFAULT,
CYG_SERIAL_PARITY_DEFAULT,
CYG_SERIAL_WORD_LENGTH_DEFAULT,
CYG_SERIAL_FLAGS_DEFAULT
);
#endif
 
DEVTAB_ENTRY(cma230_serial_io0,
CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_A_NAME,
0, // Does not depend on a lower level interface
&cyg_io_serial_devio,
cma230_serial_init,
cma230_serial_lookup, // Serial driver may need initializing
&cma230_serial_channel0
);
#endif // CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_A
 
#ifdef CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_B
static cma230_serial_info cma230_serial_info1 = {CMA101_DUARTB,
CYGNUM_HAL_INTERRUPT_SERIAL_B};
#if CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE > 0
static unsigned char cma230_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];
static unsigned char cma230_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BUFSIZE];
 
static SERIAL_CHANNEL_USING_INTERRUPTS(cma230_serial_channel1,
cma230_serial_funs,
cma230_serial_info1,
CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BAUD),
CYG_SERIAL_STOP_DEFAULT,
CYG_SERIAL_PARITY_DEFAULT,
CYG_SERIAL_WORD_LENGTH_DEFAULT,
CYG_SERIAL_FLAGS_DEFAULT,
&cma230_serial_out_buf1[0], sizeof(cma230_serial_out_buf1),
&cma230_serial_in_buf1[0], sizeof(cma230_serial_in_buf1)
);
#else
static SERIAL_CHANNEL(cma230_serial_channel1,
cma230_serial_funs,
cma230_serial_info1,
CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_CMA230_SERIAL_B_BAUD),
CYG_SERIAL_STOP_DEFAULT,
CYG_SERIAL_PARITY_DEFAULT,
CYG_SERIAL_WORD_LENGTH_DEFAULT,
CYG_SERIAL_FLAGS_DEFAULT
);
#endif
 
DEVTAB_ENTRY(cma230_serial_io1,
CYGDAT_IO_SERIAL_ARM_CMA230_SERIAL_B_NAME,
0, // Does not depend on a lower level interface
&cyg_io_serial_devio,
cma230_serial_init,
cma230_serial_lookup, // Serial driver may need initializing
&cma230_serial_channel1
);
#endif // CYGPKG_IO_SERIAL_ARM_CMA230_SERIAL_B
 
// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
cma230_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
unsigned short baud_divisor = select_baud[new_config->baud];
unsigned char _lcr, _ier;
if (baud_divisor == 0) return false; // Invalid configuration
_ier = port->ier;
port->ier = 0; // Disable port interrupts while changing hardware
_lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
select_stop_bits[new_config->stop] |
select_parity[new_config->parity];
port->lcr = _lcr;
port->lcr |= LCR_DL;
port->mdl = baud_divisor >> 8;
port->ldl = baud_divisor & 0xFF;
port->lcr &= ~LCR_DL;
if (init) {
port->fcr = 0x07; // Enable and clear FIFO
if (chan->out_cbuf.len != 0) {
port->ier = IER_RCV;
} else {
port->ier = 0;
}
port->mcr = MCR_INT|MCR_DTR|MCR_RTS; // Master interrupt enable
} else {
port->ier = _ier;
}
if (new_config != &chan->config) {
chan->config = *new_config;
}
return true;
}
 
// Function to initialize the device. Called at bootstrap time.
static bool
cma230_serial_init(struct cyg_devtab_entry *tab)
{
serial_channel *chan = (serial_channel *)tab->priv;
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
#ifdef CYGDBG_IO_INIT
diag_printf("CMA230 SERIAL init - dev: %x.%d\n", cma230_chan->base, cma230_chan->int_num);
#endif
(chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
if (chan->out_cbuf.len != 0) {
cyg_drv_interrupt_create(cma230_chan->int_num,
99, // Priority - what goes here?
(cyg_addrword_t)chan, // Data item passed to interrupt handler
cma230_serial_ISR,
cma230_serial_DSR,
&cma230_chan->serial_interrupt_handle,
&cma230_chan->serial_interrupt);
cyg_drv_interrupt_attach(cma230_chan->serial_interrupt_handle);
cyg_drv_interrupt_unmask(cma230_chan->int_num);
}
cma230_serial_config_port(chan, &chan->config, true);
return true;
}
 
// This routine is called when the device is "looked" up (i.e. attached)
static Cyg_ErrNo
cma230_serial_lookup(struct cyg_devtab_entry **tab,
struct cyg_devtab_entry *sub_tab,
const char *name)
{
serial_channel *chan = (serial_channel *)(*tab)->priv;
(chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
return ENOERR;
}
 
// Send a character to the device output buffer.
// Return 'true' if character is sent to device
static bool
cma230_serial_putc(serial_channel *chan, unsigned char c)
{
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
if (port->lsr & LSR_THE) {
// Transmit buffer is empty
port->thr = c;
return true;
} else {
// No space
return false;
}
}
 
// Fetch a character from the device input buffer, waiting if necessary
static unsigned char
cma230_serial_getc(serial_channel *chan)
{
unsigned char c;
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
while ((port->lsr & LSR_RSR) == 0) ; // Wait for char
c = port->rhr;
return c;
}
 
// Set up the device characteristics; baud rate, etc.
static Cyg_ErrNo
cma230_serial_set_config(serial_channel *chan, cyg_uint32 key,
const void *xbuf, cyg_uint32 *len)
{
switch (key) {
case CYG_IO_SET_CONFIG_SERIAL_INFO:
{
cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
if ( *len < sizeof(cyg_serial_info_t) ) {
return -EINVAL;
}
*len = sizeof(cyg_serial_info_t);
if ( true != cma230_serial_config_port(chan, config, false) )
return -EINVAL;
}
break;
default:
return -EINVAL;
}
return ENOERR;
}
 
// Enable the transmitter on the device
static void
cma230_serial_start_xmit(serial_channel *chan)
{
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
port->ier |= IER_XMT; // Enable xmit interrupt
}
 
// Disable the transmitter on the device
static void
cma230_serial_stop_xmit(serial_channel *chan)
{
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
port->ier &= ~IER_XMT; // Disable xmit interrupt
}
 
// Serial I/O - low level interrupt handler (ISR)
static cyg_uint32
cma230_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
{
serial_channel *chan = (serial_channel *)data;
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
cyg_drv_interrupt_mask(cma230_chan->int_num);
cyg_drv_interrupt_acknowledge(cma230_chan->int_num);
return CYG_ISR_CALL_DSR; // Cause DSR to be run
}
 
// Serial I/O - high level interrupt handler (DSR)
static void
cma230_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
{
serial_channel *chan = (serial_channel *)data;
cma230_serial_info *cma230_chan = (cma230_serial_info *)chan->dev_priv;
volatile struct serial_port *port = (volatile struct serial_port *)cma230_chan->base;
unsigned char isr;
isr = port->isr & 0x0E;
if (isr == ISR_Tx) {
(chan->callbacks->xmt_char)(chan);
} else if (isr == ISR_Rx) {
(chan->callbacks->rcv_char)(chan, port->rhr);
}
cyg_drv_interrupt_unmask(cma230_chan->int_num);
}
#endif
/cma230_serial.h
0,0 → 1,162
#ifndef CYGONCE_ARM_CMA230_SERIAL_H
#define CYGONCE_ARM_CMA230_SERIAL_H
 
// ====================================================================
//
// cma230_serial.h
//
// Device I/O - Description of Cogent CMA230 serial hardware
//
// ====================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
// ====================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 1999-05-20
// Purpose: Internal interfaces for serial I/O drivers
// Description:
//
//####DESCRIPTIONEND####
//
// ====================================================================
 
// Description of serial ports on Cogent CMA230
 
struct serial_port {
unsigned char _byte[32];
};
 
#define reg(n) _byte[n*8]
 
// Receive control registers
#define rhr reg(0) // Receive holding register
#define isr reg(2) // Interrupt status register
#define lsr reg(5) // Line status register
#define msr reg(6) // Modem status register
#define scr reg(7) // Scratch register
 
// Transmit control registers
#define thr reg(0) // Transmit holding register
#define ier reg(1) // Interrupt enable register
#define fcr reg(2) // FIFO control register
#define lcr reg(3) // Line control register
#define mcr reg(4) // Modem control register
#define ldl reg(0) // LSB of baud rate
#define mdl reg(1) // MSB of baud rate
 
// Interrupt Enable Register
#define IER_RCV 0x01
#define IER_XMT 0x02
#define IER_LS 0x04
#define IER_MS 0x08
 
// Line Control Register
#define LCR_WL5 0x00 // Word length
#define LCR_WL6 0x01
#define LCR_WL7 0x02
#define LCR_WL8 0x03
#define LCR_SB1 0x00 // Number of stop bits
#define LCR_SB1_5 0x04 // 1.5 -> only valid with 5 bit words
#define LCR_SB2 0x04
#define LCR_PN 0x00 // Parity mode - none
#define LCR_PE 0x0C // Parity mode - even
#define LCR_PO 0x08 // Parity mode - odd
#define LCR_PM 0x28 // Forced "mark" parity
#define LCR_PS 0x38 // Forced "space" parity
#define LCR_DL 0x80 // Enable baud rate latch
 
// Line Status Register
#define LSR_RSR 0x01
#define LSR_THE 0x20
 
// Modem Control Register
#define MCR_DTR 0x01
#define MCR_RTS 0x02
#define MCR_INT 0x08 // Enable interrupts
 
// Interrupt status register
#define ISR_Tx 0x02
#define ISR_Rx 0x04
 
static unsigned char select_word_length[] = {
LCR_WL5, // 5 bits / word (char)
LCR_WL6,
LCR_WL7,
LCR_WL8
};
 
static unsigned char select_stop_bits[] = {
0,
LCR_SB1, // 1 stop bit
LCR_SB1_5, // 1.5 stop bit
LCR_SB2 // 2 stop bits
};
 
static unsigned char select_parity[] = {
LCR_PN, // No parity
LCR_PE, // Even parity
LCR_PO, // Odd parity
LCR_PM, // Mark parity
LCR_PS, // Space parity
};
 
// The Cogent board has a 3.6864 MHz crystal
static unsigned short select_baud[] = {
0, // Unused
4608, // 50
0, // 75
2094, // 110
0, // 134.5
1536, // 150
0, // 200
768, // 300
384, // 600
182, // 1200
0, // 1800
96, // 2400
0, // 3600
48, // 4800
32, // 7200
24, // 9600
16, // 14400
12, // 19200
6, // 38400
4, // 57600
2, // 115200
0, // 230400
};
 
#endif // CYGONCE_ARM_CMA230_SERIAL_H

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