//==========================================================================////      io/serial/sh/sh_sci_serial.c////      SH Serial SCI I/O Interface Module (interrupt driven)////==========================================================================//####COPYRIGHTBEGIN####//                                                                          // -------------------------------------------                              // The contents of this file are subject to the Red Hat eCos Public License // Version 1.1 (the "License"); you may not use this file except in         // compliance with the License.  You may obtain a copy of the License at    // http://www.redhat.com/                                                   //                                                                          // Software distributed under the License is distributed on an "AS IS"      // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the // License for the specific language governing rights and limitations under // the License.                                                             //                                                                          // The Original Code is eCos - Embedded Configurable Operating System,      // released September 30, 1998.                                             //                                                                          // The Initial Developer of the Original Code is Red Hat.                   // Portions created by Red Hat are                                          // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             // All Rights Reserved.                                                     // -------------------------------------------                              //                                                                          //####COPYRIGHTEND####//==========================================================================//#####DESCRIPTIONBEGIN####//// Author(s):   jskov// Contributors:gthomas, jskov// Date:        1999-05-24// Purpose:     SH Serial I/O module (interrupt driven version)// Description: //// Note: Since interrupt sources from the same SCI channel share the same//       interrupt level, there is no risk of races when altering the//       channel's control register from ISRs and DSRs. However, when //       altering the control register from user-level code, interrupts//       must be disabled while the register is being accessed.//// FIXME: Receiving in polled mode prevents duplex transfers from working for//        some reason.//####DESCRIPTIONEND####//==========================================================================#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/infra/diag.h>#include <cyg/io/serial.h>#include <cyg/hal/sh_regs.h>#ifdef CYGPKG_IO_SERIAL_SH_EDK7708#define __CYGPKG_IO_SERIAL_SH_SCI_INL "sh_sci_7708.inl"#endif// Only compile driver if an inline file with driver details was selected.#ifdef __CYGPKG_IO_SERIAL_SH_SCI_INLstatic short select_word_length[] = {    -1,    -1,    CYGARC_REG_SCSMR_CHR,               // 7 bits    0                                   // 8 bits};static short select_stop_bits[] = {    -1,    0,                                  // 1 stop bit    -1,    CYGARC_REG_SCSMR_STOP               // 2 stop bits};static short select_parity[] = {    0,                                  // No parity    CYGARC_REG_SCSMR_PE,                // Even parity    CYGARC_REG_SCSMR_PE|CYGARC_REG_SCSMR_OE, // Odd parity    -1,    -1};static unsigned short select_baud[] = {    0,    // Unused    0, // 50    0,    // 75    0, // 110    0,    // 134.5    0, // 150    0,    // 200    0,  // 300    0,  // 600    0,  // 1200    0,    // 1800    0,   // 2400    0,    // 3600    0,   // 4800    0,   // 7200    CYGARC_REG_CKSx_9600<<8|CYGARC_REG_SCBRR_9600,   // 9600    CYGARC_REG_CKSx_14400<<8|CYGARC_REG_SCBRR_14400,   // 14400    CYGARC_REG_CKSx_19200<<8|CYGARC_REG_SCBRR_19200,   // 19200    CYGARC_REG_CKSx_38400<<8|CYGARC_REG_SCBRR_38400, // 38400    CYGARC_REG_CKSx_57600<<8|CYGARC_REG_SCBRR_57600,    // 57600    CYGARC_REG_CKSx_115200<<8|CYGARC_REG_SCBRR_115200,    // 115200    0,    // 230400};typedef struct sh_sci_info {    CYG_ADDRWORD   data;                // Pointer to data register        CYG_WORD       er_int_num,          // Error interrupt number                   rx_int_num,          // Receive interrupt number                   tx_int_num;          // Transmit interrupt number    CYG_ADDRWORD   ctrl_base;           // Base address of SCI controller    cyg_interrupt  serial_er_interrupt,                    serial_rx_interrupt,                    serial_tx_interrupt;    cyg_handle_t   serial_er_interrupt_handle,                    serial_rx_interrupt_handle,                    serial_tx_interrupt_handle;    bool           tx_enabled;} sh_sci_info;static bool sh_serial_init(struct cyg_devtab_entry *tab);static bool sh_serial_putc(serial_channel *chan, unsigned char c);static Cyg_ErrNo sh_serial_lookup(struct cyg_devtab_entry **tab,                                    struct cyg_devtab_entry *sub_tab,                                   const char *name);static unsigned char sh_serial_getc(serial_channel *chan);static bool sh_serial_set_config(serial_channel *chan, cyg_serial_info_t *config);static void sh_serial_start_xmit(serial_channel *chan);static void sh_serial_stop_xmit(serial_channel *chan);static cyg_uint32 sh_serial_tx_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       sh_serial_tx_DSR(cyg_vector_t vector, cyg_ucount32 count,                                    cyg_addrword_t data);static cyg_uint32 sh_serial_rx_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       sh_serial_rx_DSR(cyg_vector_t vector, cyg_ucount32 count,                                    cyg_addrword_t data);static cyg_uint32 sh_serial_er_ISR(cyg_vector_t vector, cyg_addrword_t data);static void       sh_serial_er_DSR(cyg_vector_t vector, cyg_ucount32 count,                                    cyg_addrword_t data);static SERIAL_FUNS(sh_serial_funs,                    sh_serial_putc,                    sh_serial_getc,                   sh_serial_set_config,                   sh_serial_start_xmit,                   sh_serial_stop_xmit    );#include __CYGPKG_IO_SERIAL_SH_SCI_INL// Internal function to actually configure the hardware to desired baud rate,// etc.static boolsh_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config,                       bool init){    cyg_uint16 baud_divisor = select_baud[new_config->baud];    sh_sci_info *sh_chan = (sh_sci_info *)chan->dev_priv;    cyg_uint8 _scr, _smr;    // Check configuration request    if ((-1 == select_word_length[(new_config->word_length -                                  CYGNUM_SERIAL_WORD_LENGTH_5)])        || -1 == select_stop_bits[new_config->stop]        || -1 == select_parity[new_config->parity]        || baud_divisor == 0)        return false;    // Disable SCI interrupts while changing hardware    HAL_READ_UINT8(sh_chan->ctrl_base+SCI_SCSCR, _scr);    HAL_WRITE_UINT8(sh_chan->ctrl_base+SCI_SCSCR, 0);    // Set databits, stopbits and parity.    _smr = select_word_length[(new_config->word_length -                               CYGNUM_SERIAL_WORD_LENGTH_5)] |         select_stop_bits[new_config->stop] |        select_parity[new_config->parity];    HAL_WRITE_UINT8(sh_chan->ctrl_base+SCI_SCSMR, _smr);    // Set baud rate.    _smr &= ~CYGARC_REG_SCSMR_CKSx_MASK;    _smr |= baud_divisor >> 8;    HAL_WRITE_UINT8(sh_chan->ctrl_base+SCI_SCSMR, _smr);    HAL_WRITE_UINT8(sh_chan->ctrl_base+SCI_SCBRR, baud_divisor & 0xff);    // Clear the status register.    HAL_WRITE_UINT8(sh_chan->ctrl_base+SCI_SCSSR, 0);    if (init) {        // Always enable transmitter and receiver.        _scr = CYGARC_REG_SCSCR_TE | CYGARC_REG_SCSCR_RE;        if (chan->out_cbuf.len != 0)            _scr |= CYGARC_REG_SCSCR_TIE; // enable tx interrupts        if (chan->in_cbuf.len != 0)            _scr |= CYGARC_REG_SCSCR_RIE; // enable rx interrupts    }         HAL_WRITE_UINT8(sh_chan->ctrl_base+SCI_SCSCR, _scr);    if (new_config != &chan->config) {        chan->config = *new_config;    }    return true;}// Function to initialize the device.  Called at bootstrap time.static bool sh_serial_init(struct cyg_devtab_entry *tab){    serial_channel *chan = (serial_channel *)tab->priv;    sh_sci_info *sh_chan = (sh_sci_info *)chan->dev_priv;#ifdef CYGDBG_IO_INIT    diag_printf("SH SERIAL init - dev: %x.%d\n",                 sh_chan->data, sh_chan->rx_int_num);#endif    // Really only required for interrupt driven devices    (chan->callbacks->serial_init)(chan);    if (chan->out_cbuf.len != 0) {        cyg_drv_interrupt_create(sh_chan->tx_int_num,                                 3,                                 (cyg_addrword_t)chan, // Data item passed to interrupt handler                                 sh_serial_tx_ISR,                                 sh_serial_tx_DSR,                                 &sh_chan->serial_tx_interrupt_handle,                                 &sh_chan->serial_tx_interrupt);        cyg_drv_interrupt_attach(sh_chan->serial_tx_interrupt_handle);        cyg_drv_interrupt_unmask(sh_chan->tx_int_num);        sh_chan->tx_enabled = false;    }    if (chan->in_cbuf.len != 0) {