mpc8xxx_serial.c

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//==========================================================================
//
//      io/serial/powerpc/mpc8xxx_serial.c
//
//      PowerPC MPC8XXX (QUICC-II) (SMC/SCC) Serial I/O Interface Module
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
// Copyright (C) 2003 Gary Thomas
//
// 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:         1999-06-20
// Purpose:      MPC8XXX Serial I/O module
// 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/infra/diag.h>
#include <cyg/hal/hal_cache.h>
#include <cyg/hal/mpc8xxx.h>
#include CYGBLD_HAL_PLATFORM_H

#include "mpc8xxx_serial.h"

typedef struct mpc8xxx_sxx_serial_info {
    CYG_ADDRWORD          channel;                   // Which channel SMCx/SCCx
    short                 int_num;                   // Interrupt number
    short                 type;                      // Channel type - SCC or SMC
    unsigned long         *brg;                      // Which baud rate generator
    void                  *pram;                     // Parameter RAM pointer
    void                  *ctl;                      // SMC/SCC control registers
    volatile struct cp_bufdesc     *txbd, *rxbd;     // Next Tx,Rx descriptor to use
    struct cp_bufdesc     *tbase, *rbase;            // First Tx,Rx descriptor
    int                   txsize, rxsize;            // Length of individual buffers
    cyg_interrupt         serial_interrupt;
    cyg_handle_t          serial_interrupt_handle;
} mpc8xxx_sxx_serial_info;

static bool mpc8xxx_sxx_serial_init(struct cyg_devtab_entry *tab);
static bool mpc8xxx_sxx_serial_putc(serial_channel *chan, unsigned char c);
static Cyg_ErrNo mpc8xxx_sxx_serial_lookup(struct cyg_devtab_entry **tab, 
                                   struct cyg_devtab_entry *sub_tab,
                                   const char *name);
static unsigned char mpc8xxx_sxx_serial_getc(serial_channel *chan);
static Cyg_ErrNo mpc8xxx_sxx_serial_set_config(serial_channel *chan,
                                             cyg_uint32 key, const void *xbuf,
                                             cyg_uint32 *len);
static void mpc8xxx_sxx_serial_start_xmit(serial_channel *chan);
static void mpc8xxx_sxx_serial_stop_xmit(serial_channel *chan);

static cyg_uint32 mpc8xxx_sxx_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
static void       mpc8xxx_sxx_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);

static SERIAL_FUNS(mpc8xxx_sxx_serial_funs, 
                   mpc8xxx_sxx_serial_putc, 
                   mpc8xxx_sxx_serial_getc,
                   mpc8xxx_sxx_serial_set_config,
                   mpc8xxx_sxx_serial_start_xmit,
                   mpc8xxx_sxx_serial_stop_xmit
    );

#ifdef CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SMC1
static mpc8xxx_sxx_serial_info mpc8xxx_sxx_serial_info_smc1 = {
    SMC1_PAGE_SUBBLOCK,                 // Channel indicator
    CYGNUM_HAL_INTERRUPT_SMC1,    // interrupt
    _SMC_CHAN
};
#if CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_BUFSIZE > 0
static unsigned char mpc8xxx_smc_serial_out_buf_smc1[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_BUFSIZE];
static unsigned char mpc8xxx_smc_serial_in_buf_smc1[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(mpc8xxx_sxx_serial_channel_smc1,
                                       mpc8xxx_sxx_serial_funs, 
                                       mpc8xxx_sxx_serial_info_smc1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &mpc8xxx_smc_serial_out_buf_smc1[0], sizeof(mpc8xxx_smc_serial_out_buf_smc1),
                                       &mpc8xxx_smc_serial_in_buf_smc1[0], sizeof(mpc8xxx_smc_serial_in_buf_smc1)
    );
#else
static SERIAL_CHANNEL(mpc8xxx_sxx_serial_channel_smc1,
                      mpc8xxx_sxx_serial_funs, 
                      mpc8xxx_sxx_serial_info_smc1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif

static unsigned char mpc8xxx_smc1_txbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_TxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_TxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));
static unsigned char mpc8xxx_smc1_rxbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_RxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC1_RxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));

DEVTAB_ENTRY(mpc8xxx_smc_serial_io_smc1, 
             CYGDAT_IO_SERIAL_POWERPC_MPC8XXX_SMC1_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             mpc8xxx_sxx_serial_init, 
             mpc8xxx_sxx_serial_lookup,     // Serial driver may need initializing
             &mpc8xxx_sxx_serial_channel_smc1
    );
#endif //  CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SMC1

#ifdef CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SMC2
static mpc8xxx_sxx_serial_info mpc8xxx_sxx_serial_info_smc2 = {
    SMC2_PAGE_SUBBLOCK,         // Channel indicator
    CYGNUM_HAL_INTERRUPT_SMC2,  // interrupt
    _SMC_CHAN
};
#if CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_BUFSIZE > 0
static unsigned char mpc8xxx_smc_serial_out_buf_smc2[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_BUFSIZE];
static unsigned char mpc8xxx_smc_serial_in_buf_smc2[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(mpc8xxx_sxx_serial_channel_smc2,
                                       mpc8xxx_sxx_serial_funs, 
                                       mpc8xxx_sxx_serial_info_smc2,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &mpc8xxx_smc_serial_out_buf_smc2[0], sizeof(mpc8xxx_smc_serial_out_buf_smc2),
                                       &mpc8xxx_smc_serial_in_buf_smc2[0], sizeof(mpc8xxx_smc_serial_in_buf_smc2)
    );
#else
static SERIAL_CHANNEL(mpc8xxx_sxx_serial_channel_smc2,
                      mpc8xxx_sxx_serial_funs, 
                      mpc8xxx_sxx_serial_info_smc2,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif
static unsigned char mpc8xxx_smc2_txbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_TxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_TxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));
static unsigned char mpc8xxx_smc2_rxbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_RxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SMC2_RxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));

DEVTAB_ENTRY(mpc8xxx_smc_serial_io_smc2, 
             CYGDAT_IO_SERIAL_POWERPC_MPC8XXX_SMC2_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             mpc8xxx_sxx_serial_init, 
             mpc8xxx_sxx_serial_lookup,     // Serial driver may need initializing
             &mpc8xxx_sxx_serial_channel_smc2
    );
#endif //  CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SMC2

#ifdef CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SCC1
static mpc8xxx_sxx_serial_info mpc8xxx_sxx_serial_info_scc1 = {
    SCC1_PAGE_SUBBLOCK,             // Channel indicator
    CYGNUM_HAL_INTERRUPT_SCC1,      // interrupt
    _SCC_CHAN
};
#if CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_BUFSIZE > 0
static unsigned char mpc8xxx_smc_serial_out_buf_scc1[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_BUFSIZE];
static unsigned char mpc8xxx_smc_serial_in_buf_scc1[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(mpc8xxx_sxx_serial_channel_scc1,
                                       mpc8xxx_sxx_serial_funs, 
                                       mpc8xxx_sxx_serial_info_scc1,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &mpc8xxx_smc_serial_out_buf_scc1[0], sizeof(mpc8xxx_smc_serial_out_buf_scc1),
                                       &mpc8xxx_smc_serial_in_buf_scc1[0], sizeof(mpc8xxx_smc_serial_in_buf_scc1)
    );
#else
static SERIAL_CHANNEL(mpc8xxx_sxx_serial_channel_scc1,
                      mpc8xxx_sxx_serial_funs, 
                      mpc8xxx_sxx_serial_info_scc1,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif
static unsigned char mpc8xxx_scc1_txbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_TxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_TxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));
static unsigned char mpc8xxx_scc1_rxbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_RxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC1_RxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));

DEVTAB_ENTRY(mpc8xxx_smc_serial_io_scc1, 
             CYGDAT_IO_SERIAL_POWERPC_MPC8XXX_SCC1_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             mpc8xxx_sxx_serial_init, 
             mpc8xxx_sxx_serial_lookup,     // Serial driver may need initializing
             &mpc8xxx_sxx_serial_channel_scc1
    );
#endif //  CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SCC1

#ifdef CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SCC2
static mpc8xxx_sxx_serial_info mpc8xxx_sxx_serial_info_scc2 = {
    SCC2_PAGE_SUBBLOCK,             // Channel indicator
    CYGNUM_HAL_INTERRUPT_SCC2,      // interrupt
    _SCC_CHAN
};
#if CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_BUFSIZE > 0
static unsigned char mpc8xxx_smc_serial_out_buf_scc2[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_BUFSIZE];
static unsigned char mpc8xxx_smc_serial_in_buf_scc2[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(mpc8xxx_sxx_serial_channel_scc2,
                                       mpc8xxx_sxx_serial_funs, 
                                       mpc8xxx_sxx_serial_info_scc2,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &mpc8xxx_smc_serial_out_buf_scc2[0], sizeof(mpc8xxx_smc_serial_out_buf_scc2),
                                       &mpc8xxx_smc_serial_in_buf_scc2[0], sizeof(mpc8xxx_smc_serial_in_buf_scc2)
    );
#else
static SERIAL_CHANNEL(mpc8xxx_sxx_serial_channel_scc2,
                      mpc8xxx_sxx_serial_funs, 
                      mpc8xxx_sxx_serial_info_scc2,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif
static unsigned char mpc8xxx_scc2_txbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_TxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_TxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));
static unsigned char mpc8xxx_scc2_rxbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_RxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC2_RxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));

DEVTAB_ENTRY(mpc8xxx_smc_serial_io_scc2, 
             CYGDAT_IO_SERIAL_POWERPC_MPC8XXX_SCC2_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             mpc8xxx_sxx_serial_init, 
             mpc8xxx_sxx_serial_lookup,     // Serial driver may need initializing
             &mpc8xxx_sxx_serial_channel_scc2
    );
#endif //  CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SCC2

#ifdef CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SCC3
static mpc8xxx_sxx_serial_info mpc8xxx_sxx_serial_info_scc3 = {
    SCC3_PAGE_SUBBLOCK,             // Channel indicator
    CYGNUM_HAL_INTERRUPT_SCC3,      // interrupt
    _SCC_CHAN
};
#if CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_BUFSIZE > 0
static unsigned char mpc8xxx_smc_serial_out_buf_scc3[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_BUFSIZE];
static unsigned char mpc8xxx_smc_serial_in_buf_scc3[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_BUFSIZE];

static SERIAL_CHANNEL_USING_INTERRUPTS(mpc8xxx_sxx_serial_channel_scc3,
                                       mpc8xxx_sxx_serial_funs, 
                                       mpc8xxx_sxx_serial_info_scc3,
                                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_BAUD),
                                       CYG_SERIAL_STOP_DEFAULT,
                                       CYG_SERIAL_PARITY_DEFAULT,
                                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
                                       CYG_SERIAL_FLAGS_DEFAULT,
                                       &mpc8xxx_smc_serial_out_buf_scc3[0], sizeof(mpc8xxx_smc_serial_out_buf_scc3),
                                       &mpc8xxx_smc_serial_in_buf_scc3[0], sizeof(mpc8xxx_smc_serial_in_buf_scc3)
    );
#else
static SERIAL_CHANNEL(mpc8xxx_sxx_serial_channel_scc3,
                      mpc8xxx_sxx_serial_funs, 
                      mpc8xxx_sxx_serial_info_scc3,
                      CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_BAUD),
                      CYG_SERIAL_STOP_DEFAULT,
                      CYG_SERIAL_PARITY_DEFAULT,
                      CYG_SERIAL_WORD_LENGTH_DEFAULT,
                      CYG_SERIAL_FLAGS_DEFAULT
    );
#endif
static unsigned char mpc8xxx_scc3_txbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_TxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_TxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));
static unsigned char mpc8xxx_scc3_rxbuf[CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_RxNUM*CYGNUM_IO_SERIAL_POWERPC_MPC8XXX_SCC3_RxSIZE] __attribute__((aligned(HAL_DCACHE_LINE_SIZE)));

DEVTAB_ENTRY(mpc8xxx_smc_serial_io_scc3, 
             CYGDAT_IO_SERIAL_POWERPC_MPC8XXX_SCC3_NAME,
             0,                     // Does not depend on a lower level interface
             &cyg_io_serial_devio, 
             mpc8xxx_sxx_serial_init, 
             mpc8xxx_sxx_serial_lookup,     // Serial driver may need initializing
             &mpc8xxx_sxx_serial_channel_scc3
    );
#endif //  CYGPKG_IO_SERIAL_POWERPC_MPC8XXX_SCC3

// Internal function to actually configure the hardware to desired baud rate, etc.
static bool
mpc8xxx_smc_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
{
    mpc8xxx_sxx_serial_info *smc_chan = (mpc8xxx_sxx_serial_info *)chan->dev_priv;
    unsigned int baud_divisor = select_baud[new_config->baud];
    cyg_uint32 _lcr;
    volatile struct smc_regs_8260 *ctl = (volatile struct smc_regs_8260*)smc_chan->ctl;