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//=============================================================================

//

//      ser_asb.c

//

//      Simple driver for the serial controllers on the AM33 ASB305 board

//

//=============================================================================

//####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

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// 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

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// 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

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//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

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// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//=============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   dhowells

// Contributors:dmoseley, nickg, gthomas

// Date:        2001-05-18

// Description: Simple driver for the ASB2305 debug serial port

//

//####DESCRIPTIONEND####

//

//=============================================================================

#include <pkgconf/hal.h>

#include <cyg/hal/hal_arch.h>           // SAVE/RESTORE GP macros

#include <cyg/hal/hal_io.h>             // IO macros

#include <cyg/hal/hal_if.h>             // interface API

#include <cyg/hal/hal_intr.h>           // HAL_ENABLE/MASK/UNMASK_INTERRUPTS

#include <cyg/hal/hal_misc.h>           // Helper functions

#include <cyg/hal/drv_api.h>            // CYG_ISR_HANDLED

#if defined(CYGNUM_HAL_AM33_PLF_SERIAL_CHANNELS) && CYGNUM_HAL_AM33_PLF_SERIAL_CHANNELS > 0

/*---------------------------------------------------------------------------*/

/* From serial_16550.h */

#if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD==9600

#define CYG_DEVICE_SERIAL_BAUD_MSB        0x00

#define CYG_DEVICE_SERIAL_BAUD_LSB        0x78

#endif

#if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD==19200

#define CYG_DEVICE_SERIAL_BAUD_MSB        0x00

#define CYG_DEVICE_SERIAL_BAUD_LSB        0x3C

#endif

#if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD==38400

#define CYG_DEVICE_SERIAL_BAUD_MSB        0x00

#define CYG_DEVICE_SERIAL_BAUD_LSB        0x1E

#endif

#if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD==57600

#define CYG_DEVICE_SERIAL_BAUD_MSB        0x00

#define CYG_DEVICE_SERIAL_BAUD_LSB        0x14

#endif

#if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD==115200

#define CYG_DEVICE_SERIAL_BAUD_MSB        0x00

#define CYG_DEVICE_SERIAL_BAUD_LSB        0x0A

#endif

#ifndef CYG_DEVICE_SERIAL_BAUD_MSB

#error Missing/incorrect serial baud rate defined - CDL error?

#endif

/*---------------------------------------------------------------------------*/

// Define the serial registers.

#define CYG_DEV_RBR 0x00   // receiver buffer register, read, dlab = 0

#define CYG_DEV_THR 0x00   // transmitter holding register, write, dlab = 0

#define CYG_DEV_DLL 0x00   // divisor latch (LS), read/write, dlab = 1

#define CYG_DEV_IER 0x04   // interrupt enable register, read/write, dlab = 0

#define CYG_DEV_DLM 0x04   // divisor latch (MS), read/write, dlab = 1

#define CYG_DEV_IIR 0x08   // interrupt identification register, read, dlab = 0

#define CYG_DEV_FCR 0x08   // fifo control register, write, dlab = 0

#define CYG_DEV_LCR 0x0C   // line control register, read/write

#define CYG_DEV_MCR 0x10   // modem control register, read/write

#define CYG_DEV_LSR 0x14   // line status register, read

#define CYG_DEV_MSR 0x18   // modem status register, read

// Interrupt Enable Register

#define SIO_IER_RCV 0x01

#define SIO_IER_XMT 0x02

#define SIO_IER_LS  0x04

#define SIO_IER_MS  0x08

// The line status register bits.

#define SIO_LSR_DR      0x01            // data ready

#define SIO_LSR_OE      0x02            // overrun error

#define SIO_LSR_PE      0x04            // parity error

#define SIO_LSR_FE      0x08            // framing error

#define SIO_LSR_BI      0x10            // break interrupt

#define SIO_LSR_THRE    0x20            // transmitter holding register empty

#define SIO_LSR_TEMT    0x40            // transmitter register empty

#define SIO_LSR_ERR     0x80            // any error condition

// The modem status register bits.

#define SIO_MSR_DCTS  0x01              // delta clear to send

#define SIO_MSR_DDSR  0x02              // delta data set ready

#define SIO_MSR_TERI  0x04              // trailing edge ring indicator

#define SIO_MSR_DDCD  0x08              // delta data carrier detect

#define SIO_MSR_CTS   0x10              // clear to send

#define SIO_MSR_DSR   0x20              // data set ready

#define SIO_MSR_RI    0x40              // ring indicator

#define SIO_MSR_DCD   0x80              // data carrier detect

// The line control register bits.

#define SIO_LCR_WLS0   0x01             // word length select bit 0

#define SIO_LCR_WLS1   0x02             // word length select bit 1

#define SIO_LCR_STB    0x04             // number of stop bits

#define SIO_LCR_PEN    0x08             // parity enable

#define SIO_LCR_EPS    0x10             // even parity select

#define SIO_LCR_SP     0x20             // stick parity

#define SIO_LCR_SB     0x40             // set break

#define SIO_LCR_DLAB   0x80             // divisor latch access bit

// Modem Control Register

#define SIO_MCR_DTR 0x01

#define SIO_MCR_RTS 0x02

#define SIO_MCR_INT 0x08   // Enable interrupts

#define LSR_WAIT_FOR(STATE) do { cyg_uint8 lsr; do { HAL_READ_UINT8(base+CYG_DEV_LSR, lsr); } while (!(lsr&SIO_LSR_##STATE)); } while(0)

#define LSR_QUERY(STATE) ({ cyg_uint8 lsr; HAL_READ_UINT8(base+CYG_DEV_LSR, lsr); (lsr&SIO_LSR_##STATE); })

#ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_RTSCTS

#define FLOWCTL_QUERY(LINE) ({ cyg_uint8 msr; HAL_READ_UINT8(base+CYG_DEV_MSR, msr); (msr&SIO_MSR_##LINE); })

#define FLOWCTL_WAIT_FOR(LINE) do { cyg_uint8 msr; do { HAL_READ_UINT8(base+CYG_DEV_MSR, msr); } while (!(msr&SIO_MSR_##LINE)); } while(0)

#define FLOWCTL_CLEAR(LINE) do { cyg_uint8 mcr; HAL_READ_UINT8(base+CYG_DEV_MCR,mcr); mcr &= ~SIO_MCR_##LINE; HAL_WRITE_UINT8(base+CYG_DEV_MCR, mcr); } while (0);

#define FLOWCTL_SET(LINE) do { cyg_uint8 mcr; HAL_READ_UINT8(base+CYG_DEV_MCR,mcr); mcr |= SIO_MCR_##LINE; HAL_WRITE_UINT8(base+CYG_DEV_MCR, mcr); } while (0);

#else

#define FLOWCTL_QUERY(LINE) 1

#define FLOWCTL_WAIT_FOR(LINE) do { ; } while(0)

#define FLOWCTL_CLEAR(LINE) do { ; } while(0)

#define FLOWCTL_SET(LINE) do { ; } while(0)

#endif

//-----------------------------------------------------------------------------

typedef struct {

    cyg_uint8* base;

    cyg_int32 msec_timeout;

    int isr_vector;

} channel_data_t;

static channel_data_t asb2305_serial_channels[] = {

    { (cyg_uint8*)0xA6FB0000, 1000, CYGNUM_HAL_INTERRUPT_SERIAL_0_RX }

};

//-----------------------------------------------------------------------------

static void

cyg_hal_plf_serial_init_channel(const void* __ch_data)

{

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    cyg_uint8 lcr;

    // 8-1-no parity.

    HAL_WRITE_UINT8(base+CYG_DEV_LCR, SIO_LCR_WLS0 | SIO_LCR_WLS1);

    HAL_READ_UINT8(base+CYG_DEV_LCR, lcr);

    lcr |= SIO_LCR_DLAB;

    HAL_WRITE_UINT8(base+CYG_DEV_LCR, lcr);

    HAL_WRITE_UINT8(base+CYG_DEV_DLL, CYG_DEVICE_SERIAL_BAUD_LSB);

    HAL_WRITE_UINT8(base+CYG_DEV_DLM, CYG_DEVICE_SERIAL_BAUD_MSB);

    lcr &= ~SIO_LCR_DLAB;

    HAL_WRITE_UINT8(base+CYG_DEV_LCR, lcr);

    HAL_WRITE_UINT8(base+CYG_DEV_FCR, 0x07);  // Enable & clear FIFO

    FLOWCTL_CLEAR(DTR);

    FLOWCTL_CLEAR(RTS);

}

static void

cyg_hal_plf_serial_putc_aux(cyg_uint8* base, char c)

{

    LSR_WAIT_FOR(THRE);

    FLOWCTL_WAIT_FOR(CTS);

    HAL_WRITE_UINT8(base+CYG_DEV_THR, c);

}

void

cyg_hal_plf_serial_putc(void *__ch_data, char c)

{

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    CYGARC_HAL_SAVE_GP();

    FLOWCTL_SET(DTR);

    cyg_hal_plf_serial_putc_aux(base,c);

    FLOWCTL_CLEAR(DTR);

    CYGARC_HAL_RESTORE_GP();

}

static cyg_bool

cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)

{

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    if (!LSR_QUERY(DR))

        return false;

    HAL_READ_UINT8(base+CYG_DEV_RBR, *ch);

    return true;

}

cyg_uint8

cyg_hal_plf_serial_getc(void* __ch_data)

{

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    cyg_uint8 ch;

    CYGARC_HAL_SAVE_GP();

    /* see if there's some cached data in the FIFO */

    if (!cyg_hal_plf_serial_getc_nonblock(__ch_data, &ch)) {

        /* there isn't - open the flood gates */

        FLOWCTL_WAIT_FOR(DSR);

        FLOWCTL_SET(RTS);

        while (!cyg_hal_plf_serial_getc_nonblock(__ch_data, &ch));

        FLOWCTL_CLEAR(RTS);

    }

    CYGARC_HAL_RESTORE_GP();

    return ch;

}

static void

cyg_hal_plf_serial_write(void* __ch_data, const cyg_uint8* __buf,

                         cyg_uint32 __len)

{

    cyg_uint8* base = ((channel_data_t*)__ch_data)->base;

    CYGARC_HAL_SAVE_GP();

    FLOWCTL_SET(DTR);

    while(__len-- > 0)

        cyg_hal_plf_serial_putc_aux(__ch_data, *__buf++);

    FLOWCTL_CLEAR(DTR);

    CYGARC_HAL_RESTORE_GP();

}

static void

cyg_hal_plf_serial_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)

{

    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)

        *__buf++ = cyg_hal_plf_serial_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();

}

#define TM0MD 0xD4003000

#define TM0BR 0xD4003010

#define TM0BC 0xD4003020

cyg_bool

cyg_hal_plf_serial_getc_timeout(void* __ch_data, cyg_uint8* ch)

{

#if 1

    int delay_count;

    channel_data_t* chan = (channel_data_t*)__ch_data;

    cyg_uint8* base = chan->base;

    cyg_uint8 last, val;

    cyg_bool res;

    CYGARC_HAL_SAVE_GP();

    /* see if there's any cached data in the FIFO */

    res = cyg_hal_plf_serial_getc_nonblock(__ch_data,ch);

    if (!res) {

        /* there isn't - open the flood gates */

        delay_count = chan->msec_timeout * 125; // want delay in 8uS steps

        HAL_WRITE_UINT8(TM0BR,200); // IOCLK is 25MHz, we want 125KHz

        HAL_WRITE_UINT8(TM0MD,0x40); // stop and load

        HAL_WRITE_UINT8(TM0MD,0x80); // set source to be IOCLK and go

        HAL_READ_UINT8(TM0BC,last);

        while (delay_count>0 && !FLOWCTL_QUERY(DSR)) {

                HAL_READ_UINT8(TM0BC,val);

                if (val==last) continue;

                if (val>last)

                        delay_count--; // count the underflows

                last = val;

        }

        if (delay_count==0)

            goto timeout;

        FLOWCTL_SET(RTS);

        while (delay_count>0 && !LSR_QUERY(DR)) {

                HAL_READ_UINT8(TM0BC,val);

                if (val==last) continue;

                if (val>last)

                        delay_count--; // count the underflows

                last = val;

        }

        FLOWCTL_CLEAR(RTS);

        if (LSR_QUERY(DR)) {

            HAL_READ_UINT8(base+CYG_DEV_RBR, *ch);

            res = true;

        }

    timeout:

        HAL_WRITE_UINT8(TM0MD,0x00); // stop h/w timer

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

#else

    int delay_count;

    channel_data_t* chan = (channel_data_t*)__ch_data;

    cyg_uint8* base = chan->base;

    cyg_bool res;

    CYGARC_HAL_SAVE_GP();

    /* see if there's some cached data in the FIFO */

    res = cyg_hal_plf_serial_getc_nonblock(__ch_data,ch);

    if (!res) {

        /* there isn't - open the flood gates */

        delay_count = chan->msec_timeout * 1000; // want delay in uS steps

        for (; delay_count>0 && !FLOWCTL_QUERY(DSR); delay_count--)

            CYGACC_CALL_IF_DELAY_US(1);

        if (delay_count==0)

            goto timeout;

        FLOWCTL_SET(RTS);

        for (; delay_count>0 && !LSR_QUERY(DR); delay_count--)

            CYGACC_CALL_IF_DELAY_US(1);

        FLOWCTL_CLEAR(RTS);

        if (LSR_QUERY(DR)) {

            HAL_READ_UINT8(base+CYG_DEV_RBR, *ch);

            res = true;

        }

    }

timeout:

    CYGARC_HAL_RESTORE_GP();

    return res;

#endif

}

static int

cyg_hal_plf_serial_control(void *__ch_data, __comm_control_cmd_t __func, ...)

{

    static int irq_state = 0;

    channel_data_t* chan = (channel_data_t*)__ch_data;

    int ret = 0;

    CYGARC_HAL_SAVE_GP();

    switch (__func) {

    case __COMMCTL_IRQ_ENABLE:

        irq_state = 1;

        HAL_WRITE_UINT8(chan->base+CYG_DEV_IER, SIO_IER_RCV);

        HAL_WRITE_UINT8(chan->base+CYG_DEV_MCR, SIO_MCR_INT|SIO_MCR_DTR|SIO_MCR_RTS);

        HAL_INTERRUPT_UNMASK(chan->isr_vector);

        break;

    case __COMMCTL_IRQ_DISABLE:

        ret = irq_state;

        irq_state = 0;

        HAL_WRITE_UINT8(chan->base+CYG_DEV_IER, 0);

        HAL_INTERRUPT_MASK(chan->isr_vector);

        break;

    case __COMMCTL_DBG_ISR_VECTOR:

        ret = chan->isr_vector;

        break;

    case __COMMCTL_SET_TIMEOUT:

    {

        va_list ap;

        va_start(ap, __func);

        ret = chan->msec_timeout;

        chan->msec_timeout = va_arg(ap, cyg_uint32);

        va_end(ap);

    }

    default:

        break;

    }

    CYGARC_HAL_RESTORE_GP();

    return ret;

}

static int

cyg_hal_plf_serial_isr(void *__ch_data, int* __ctrlc,

                       CYG_ADDRWORD __vector, CYG_ADDRWORD __data)

{

    int res = 0;

    channel_data_t* chan = (channel_data_t*)__ch_data;

    char c;

    cyg_uint8 lsr;

    CYGARC_HAL_SAVE_GP();

    cyg_drv_interrupt_acknowledge(chan->isr_vector);

    *__ctrlc = 0;

    HAL_READ_UINT8(chan->base+CYG_DEV_LSR, lsr);

    if ( (lsr & SIO_LSR_DR) != 0 ) {

        HAL_READ_UINT8(chan->base+CYG_DEV_RBR, c);

        if( cyg_hal_is_break( &c , 1 ) )

            *__ctrlc = 1;

        res = CYG_ISR_HANDLED;

    }

    CYGARC_HAL_RESTORE_GP();

    return res;

}

static void

cyg_hal_plf_serial_init(void)

{

    hal_virtual_comm_table_t* comm;

    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

    // Disable interrupts.

    HAL_INTERRUPT_MASK(asb2305_serial_channels[0].isr_vector);

    // Init channels

    cyg_hal_plf_serial_init_channel(&asb2305_serial_channels[0]);

    // Setup procs in the vector table

    // Set channel 0

    CYGACC_CALL_IF_SET_CONSOLE_COMM(0);

    comm = CYGACC_CALL_IF_CONSOLE_PROCS();

    CYGACC_COMM_IF_CH_DATA_SET(*comm, &asb2305_serial_channels[0]);

    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_serial_write);

    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_serial_read);

    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_serial_putc);

    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_serial_getc);

    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_serial_control);

    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_serial_isr);

    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_serial_getc_timeout);

    // Restore original console

    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);

}

void

cyg_hal_plf_comms_init(void)

{

    static int initialized = 0;

    if (initialized)

        return;

    initialized = 1;

    cyg_hal_plf_serial_init();

#if defined(CYGNUM_HAL_AM33_SERIAL_CHANNELS) && CYGNUM_HAL_AM33_SERIAL_CHANNELS > 0

    cyg_hal_am33_serial_init(1);

#endif

}

#endif // defined(CYGNUM_HAL_AM33_PLF_SERIAL_CHANNELS) && CYGNUM_HAL_AM33_PLF_SERIAL_CHANNELS > 0

/*---------------------------------------------------------------------------*/

/* End of ser_asb.c */