smdk2410_serial.c

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//==========================================================================
//
//      io/serial/arm/smdk2410_serial.c
//
//      Samsung SMDK2410 Serial I/O Interface Module (interrupt driven)
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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// or inline functions from this file, or you compile this file and link it
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//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    michael anburaj <[e-mail]>
// Contributors: michael anburaj <[e-mail]>
// Date:         2003-08-01
// Purpose:      SMDK2410 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>           // interrupt
#include <cyg/hal/hal_io.h>             // register base
#include <cyg/io/devtab.h>
#include <cyg/io/serial.h>
#include <cyg/infra/diag.h>

#ifdef CYGPKG_IO_SERIAL_ARM_SMDK2410

#include "smdk2410_serial.h"

typedef struct smdk2410_serial_info {
    CYG_ADDRWORD   base;
    CYG_WORD       int_num;
    cyg_uint32     bit_sub_rxd;
    cyg_interrupt  serial_interrupt;
    cyg_handle_t   serial_interrupt_handle;
} smdk2410_serial_info;

static bool smdk2410_serial_init(struct cyg_devtab_entry *tab);
static bool smdk2410_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo smdk2410_serial_lookup(struct cyg_devtab_entry **tab, 
                                        struct cyg_devtab_entry *sub_tab,
                                        const char *name);
static unsigned char smdk2410_serial_getc(serial_channel *chan);
static Cyg_ErrNo smdk2410_serial_set_config(serial_channel *chan, 
                                            cyg_uint32 key,
                                            const void *xbuf, cyg_uint32 *len);
static void smdk2410_serial_start_xmit(serial_channel *chan);
static void smdk2410_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 smdk2410_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       smdk2410_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(smdk2410_serial_funs, 
                   smdk2410_serial_putc, 
                   smdk2410_serial_getc,
                   smdk2410_serial_set_config,
                   smdk2410_serial_start_xmit,
                   smdk2410_serial_stop_xmit
    );

#ifdef CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL0
static smdk2410_serial_info smdk2410_serial_info0 = {(cyg_uint32)ULCON0,
                                                     CYGNUM_HAL_INTERRUPT_UART0,
                                                     BIT_SUB_RXD0};
#if CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BUFSIZE > 0
static unsigned char smdk2410_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BUFSIZE];
static unsigned char smdk2410_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(smdk2410_serial_channel0,
                                       smdk2410_serial_funs, 
                                       smdk2410_serial_info0,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &smdk2410_serial_out_buf0[0], sizeof(smdk2410_serial_out_buf0),
                                       &smdk2410_serial_in_buf0[0], sizeof(smdk2410_serial_in_buf0)
    );
#else
static SERIAL_CHANNEL(smdk2410_serial_channel0,
                      smdk2410_serial_funs, 
                      smdk2410_serial_info0,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL0_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(smdk2410_serial_io0, 
             CYGDAT_IO_SERIAL_ARM_SMDK2410_SERIAL0_NAME,
             0,                          // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             smdk2410_serial_init, 
             smdk2410_serial_lookup,     // Serial driver may need initializing
             &smdk2410_serial_channel0
    );
#endif //  CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL0

#ifdef CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL1
static smdk2410_serial_info smdk2410_serial_info1 = {(cyg_uint32)ULCON1,
                                                     CYGNUM_HAL_INTERRUPT_UART1,
                                                     BIT_SUB_RXD1};
#if CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BUFSIZE > 0
static unsigned char smdk2410_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BUFSIZE];
static unsigned char smdk2410_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(smdk2410_serial_channel1,
                                       smdk2410_serial_funs, 
                                       smdk2410_serial_info1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &smdk2410_serial_out_buf1[0], sizeof(smdk2410_serial_out_buf1),
                                       &smdk2410_serial_in_buf1[0], sizeof(smdk2410_serial_in_buf1)
    );
#else
static SERIAL_CHANNEL(smdk2410_serial_channel1,
                      smdk2410_serial_funs, 
                      smdk2410_serial_info1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SMDK2410_SERIAL1_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

DEVTAB_ENTRY(smdk2410_serial_io1, 
             CYGDAT_IO_SERIAL_ARM_SMDK2410_SERIAL1_NAME,
             0,                          // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             smdk2410_serial_init, 
             smdk2410_serial_lookup,     // Serial driver may need initializing
             &smdk2410_serial_channel1
    );
#endif //  CYGPKG_IO_SERIAL_ARM_SMDK2410_SERIAL1

// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
smdk2410_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    smdk2410_serial_info *smdk2410_chan = (smdk2410_serial_info *)chan->dev_priv;
    CYG_ADDRWORD base = smdk2410_chan->base;
    unsigned short baud_divisor = select_baud[new_config->baud];
    cyg_uint32 _lcr;

    if (baud_divisor == 0) return false;

    if (init) {
        //UART FIFO control register
        HAL_WRITE_UINT32(base+OFS_UFCON, (3<<6) | (3<<4) | (1<<2) | (1<<1) | (1<<0));