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 /* SPDX-License-Identifier: BSD-2-Clause */
 
 /*
  *  This file contains the termios TTY driver for the i386
  *  vga.
  *
  *  COPYRIGHT (c) 1989-2011.
  *  On-Line Applications Research Corporation (OAR).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <rtems.h>
 #include <rtems/libio.h>
 #include <stdlib.h>
 #include <libchip/serial.h>
 #include <rtems/vgacons.h>
 #include <rtems/keyboard.h>
 #include <libchip/sersupp.h>
 #include <bsp/irq.h>
 #include <bsp.h>
 #include <crt.h>
 #include <assert.h>
 #include <rtems/keyboard.h>
 
 #define VGACONS_STATIC static
 
 /*
  *  vgacons_init
  *
  *  This function initializes the VGA console to a quiecsent state.
  */
 VGACONS_STATIC void vgacons_init(int minor)
 {
   /*
    * Note:  We do not initialize the KBD interface here since
    *        it was initialized regardless of whether the
    *        vga is available or not.  Therefore it is initialized
    *        in bsp_start.
    */
 }
 
 /*
  *  vgacons_open
  *
  *  This function opens a port for communication.
  *
  *  Default state is 9600 baud, 8 bits, No parity, and 1 stop bit.
  */
 VGACONS_STATIC int vgacons_open(
   int      major,
   int      minor,
   void    *arg
 )
 {
   return RTEMS_SUCCESSFUL;
 }
 
 /*
  *  vgacons_close
  *
  *  This function shuts down the requested port.
  */
 VGACONS_STATIC int vgacons_close(
   int      major,
   int      minor,
   void    *arg
 )
 {
   return(RTEMS_SUCCESSFUL);
 }
 
 /*
  *  vgacons_write_polled
  *
  *  This routine polls out the requested character.
  */
 VGACONS_STATIC void vgacons_write_polled(
   int   minor,
   char  c
 )
 {
   _IBMPC_outch( c );
   if( c == '\n')
     _IBMPC_outch( '\r' );            /* LF = LF + CR */
 }
 
 /*
  *  vgacons_write_support_polled
  *
  *  Console Termios output entry point when using polled output.
  *
  */
 VGACONS_STATIC ssize_t vgacons_write_support_polled(
   int         minor,
   const char *buf,
   size_t      len
 )
 {
   int nwrite = 0;
 
   /*
    * poll each byte in the string out of the port.
    */
   while (nwrite < len) {
     vgacons_write_polled(minor, *buf++);
     nwrite++;
   }
 
   /*
    * return the number of bytes written.
    */
   return nwrite;
 }
 
 /*
  *  vgacons_inbyte_nonblocking_polled
  *
  *  Console Termios polling input entry point.
  */
 VGACONS_STATIC int vgacons_inbyte_nonblocking_polled(
   int minor
 )
 {
   if( rtems_kbpoll() ) {
     int c = getch();
     return c;
   }
 
   return -1;
 }
 
 /*
  *  vgacons_set_attributes
  *
  *  This function sets the UART channel to reflect the requested termios
  *  port settings.
  */
 VGACONS_STATIC int vgacons_set_attributes(
   int minor,
   const struct termios *t
 )
 {
   return 0;
 }
 
 bool vgacons_probe(
   int minor
 )
 {
   rtems_status_code status;
   static bool firstTime = true;
 
   /*
    * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578#c16
    */
   const uint8_t* volatile nb_max_row = (const uint8_t*) NB_MAX_ROW_ADDR;
   const uint16_t* volatile nb_max_col = (const uint16_t*) NB_MAX_COL_ADDR;
   if ((*nb_max_row == 0) && (*nb_max_col == 0)) {
     return false;
   }
 
   /*
    *  If there is a video card, let's assume there is also a keyboard.
    *  The means that we need the ISR installed in case someone wants to
    *  use the Keyboard or PS2 Mouse.  With Microwindows, the console
    *  can be COM1 and you can still use the mouse/VGA for graphics.
    */
   if ( firstTime ) {
     status = rtems_interrupt_handler_install(
       BSP_KEYBOARD,
       "vgacons",
       RTEMS_INTERRUPT_UNIQUE,
       keyboard_interrupt,
       NULL
     );
     assert(status == RTEMS_SUCCESSFUL);
   }
   firstTime = false;
 
   return true;
 }
 
 const console_fns vgacons_fns =
 {
   libchip_serial_default_probe,        /* deviceProbe */
   vgacons_open,                        /* deviceFirstOpen */
   vgacons_close,                       /* deviceLastClose */
   vgacons_inbyte_nonblocking_polled,   /* deviceRead */
   vgacons_write_support_polled,        /* deviceWrite */
   vgacons_init,                        /* deviceInitialize */
   vgacons_write_polled,                /* deviceWritePolled */
   vgacons_set_attributes,              /* deviceSetAttributes */
   FALSE,                               /* deviceOutputUsesInterrupts */
 };

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