[PATCH v4] Raspberrypi: updated the console interface.

Christian Mauderer list at c-mauderer.de
Tue Dec 31 10:37:07 UTC 2019


On 31/12/2019 06:11, Niteesh wrote:
> On Tue, Dec 31, 2019 at 1:13 AM Christian Mauderer <list at c-mauderer.de
> <mailto:list at c-mauderer.de>> wrote:
> 
>     On 30/12/2019 19:32, Niteesh wrote:
>     > Just to make sure that console_initialize and uart_probe are being
>     > called, I manually initialized the pl011 context to print something on
>     > serial. But they never got called. Can you just make sure that if I am
>     > missing something?
> 
>     I don't think that you are missing something but the executable is
>     missing something: The functions are not linked into it.
> 
>     C linker can be an odd thing: It links only object files that are
>     referenced. You seem to have no reference to console-config.c/o from
>     anywhere else.
> 
>     RTEMS_SYSINIT_ITEM(
>       uart_probe,
>       RTEMS_SYSINIT_BSP_START,
>       RTEMS_SYSINIT_ORDER_LAST
>     );
> 
>     will be only added to the linker set if the file is linked in anyway.
> 
>     That is a bit anoying. For the imx BSP there is a UART drain function
>     that is called from somewhere else. Thats enough to bring the file in.
> 
>     I think you'll need to add a reference from somewhere or move that stuff
>     into another file that is referenced.
> 
>     If you have some init function that has to be called in every case you
>     can call it from some other c file where it would fit too.
> 
>     Otherwise it might is necessary to construct some odd stuff. I'm not
>     sure whether we already had a case like this. Most likely it would be
>     necessary to use a RTEMS_LINKER_ROSET_ITEM_REFERENCE for the
>     SYSINIT_ITEM. Maybe to define a new RTEMS_SYSINIT_ITEM_REFERENCE or
>     simmilar. This should be definitively a separate commit. Please ask
>     again if you have to go that way.
> 
> I didn't understand the above part. So what I did was created a dummy
> function in console-config.c
> and referenced in places that I know we're going to be called. But
> still, it didn't work. 
> 

That's a really mean bug to find:

1. My assumption was wrong. The file is linked in. Most likely due to
BSP_output_char which is defined in this file.

2. Please remove console-termios-init.c. It would define the same
console_initialize() function.

3. The real proble just caused a warning which was a bit hard to spot:
The compile doesn't know RTEMS_SYSINIT_ITEM. It thinks it's a function
body and warns that it defaults the return type to int. In other words:
You missed to include <rtems/sysinit.h>. If you add that the
RTEMS_SYSINIT_ITEM works and uart_probe is linked in.

4. console_initialize is still not used. It is really hard to spot why:
Most of the tests only use the configuration:

    CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER

This is a simplified polled console driver. From the samples only
capture, fileio and pppd are using the normal console with:

    CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER

So only for these three the console_initialize will be called.

By the way: You can use objdump to analyze your elf-files. For example
to get a symbol table use:

    arm-rtems5-objdump -t path/to/ticker.exe

To get the disassembled code with intermixed c-sources use

    arm-rtems5-objdump -dS path/to/ticker.exe

That's very usefull to find whether a symbol is linked in or not.

>      
> 
>     >
>     > While going through the messages from devel-request, Joel mentioned
>     > about qemu4 rsb package
>     > how is it different from the official qemu?
>     >
>     > On Mon, Dec 30, 2019 at 11:53 PM G S Niteesh <gsnb.gn at gmail.com
>     <mailto:gsnb.gn at gmail.com>
>     > <mailto:gsnb.gn at gmail.com <mailto:gsnb.gn at gmail.com>>> wrote:
>     >
>     >     The patch updates the older console interface used by the BSP,
>     >     to newer one. It also replaces the custom usart(PL011) driver
>     >     with arm-pl011. The fb function's signatures where also changed
>     >     to accommodate with interface update.
>     >     Update #3034
>     >     ---
>     >      bsps/arm/raspberrypi/console/console-config.c | 186
>     ++++++++++++++----
>     >      bsps/arm/raspberrypi/console/console_select.c | 114 -----------
>     >      bsps/arm/raspberrypi/console/fbcons.c         |  78 ++++----
>     >      bsps/arm/raspberrypi/console/usart.c          | 167
>     ----------------
>     >      bsps/arm/raspberrypi/include/bsp/fbcons.h     |  21 +-
>     >      .../arm/raspberrypi/include/bsp/raspberrypi.h |  48 ++---
>     >      bsps/arm/raspberrypi/include/bsp/usart.h      |   5 +-
>     >      c/src/lib/libbsp/arm/raspberrypi/Makefile.am  |   8 +-
>     >      8 files changed, 220 insertions(+), 407 deletions(-)
>     >      delete mode 100644 bsps/arm/raspberrypi/console/console_select.c
>     >      delete mode 100644 bsps/arm/raspberrypi/console/usart.c
>     >
>     >     diff --git a/bsps/arm/raspberrypi/console/console-config.c
>     >     b/bsps/arm/raspberrypi/console/console-config.c
>     >     index d2186c918b..021428ff4b 100644
>     >     --- a/bsps/arm/raspberrypi/console/console-config.c
>     >     +++ b/bsps/arm/raspberrypi/console/console-config.c
>     >     @@ -19,50 +19,164 @@
>     >       */
>     >
>     >      #include <rtems/bspIo.h>
>     >     +#include <rtems/console.h>
>     >
>     >     -#include <libchip/serial.h>
>     >
>     >     -#include <bspopts.h>
>     >     -#include <bsp/irq.h>
>     >     -#include <bsp/usart.h>
>     >     +#include <bsp.h>
>     >      #include <bsp/raspberrypi.h>
>     >     +#include <bsp/usart.h>
>     >     +#include <bsp/arm-pl011.h>
>     >      #include <bsp/fbcons.h>
>     >     +#include <bsp/console-termios.h>
>     >     +#include <bsp/fdt.h>
>     >     +#include <bsp/fatal.h>
>     >     +
>     >     +#include <bspopts.h>
>     >     +
>     >     +#include <libfdt.h>
>     >     +#include <libchip/serial.h>
>     >     +
>     >     +arm_pl011_context pl011_context;
>     >     +rpi_fb_context fb_context;
> 
>     These could be static.
> 
>     >     +
>     >     +static void output_char_serial(char c)
>     >     +{
>     >     +  arm_pl011_write_polled(&pl011_context.base, c);
>     >     +}
>     >     +
>     >     +void output_char_fb(char c)
>     >     +{
>     >     +  fbcons_write_polled(&fb_context.base, c);
>     >     +}
>     >
>     >     -console_tbl Console_Configuration_Ports [] = {
>     >     -    {
>     >     -      .sDeviceName = "/dev/ttyS0",
>     >     -      .deviceType = SERIAL_CUSTOM,
>     >     -      .pDeviceFns = &bcm2835_usart_fns,
>     >     -      .deviceProbe = NULL,
>     >     -      .pDeviceFlow = NULL,
>     >     -      .ulCtrlPort1 = BCM2835_UART0_BASE,
>     >     -      .ulCtrlPort2 = 0,
>     >     -      .ulClock = USART0_DEFAULT_BAUD,
>     >     -      .ulIntVector = BCM2835_IRQ_ID_UART
>     >     -    },
>     >     -    {
>     >     -      .sDeviceName ="/dev/fbcons",
>     >     -      .deviceType = SERIAL_CUSTOM,
>     >     -      .pDeviceFns = &fbcons_fns,
>     >     -      .deviceProbe = fbcons_probe,
>     >     -      .pDeviceFlow = NULL,
>     >     -    },
>     >     -};
>     >     -
>     >     -#define PORT_COUNT \
>     >     -  (sizeof(Console_Configuration_Ports) \
>     >     -    / sizeof(Console_Configuration_Ports [0]))
>     >     -
>     >     -unsigned long Console_Configuration_Count = PORT_COUNT;
>     >     -
>     >     -static void output_char(char c)
>     >     +
>     >     +static void *get_reg_of_node(const void *fdt, int node)
>     >      {
>     >     -  const console_fns *con =
>     >     -    Console_Configuration_Ports [Console_Port_Minor].pDeviceFns;
>     >     +  int len;
>     >     +  const uint32_t *val;
>     >     +
>     >     +  val = fdt_getprop(fdt, node, "reg", &len);
>     >     +  if (val == NULL || len < 4) {
>     >     +    return NULL;
>     >     +  }
>     >
>     >     -  con->deviceWritePolled((int) Console_Port_Minor, c);
>     >     +  return (void *) fdt32_to_cpu(val[0]);
>     >      }
>     >
>     >     -BSP_output_char_function_type BSP_output_char = output_char;
>     >     +static void register_arm_pl011(
>     >     +  const void *fdt,
>     >     +  const char *serial
>     >     +)
>     >     +{
>     >     +  arm_pl011_context *ctx = &pl011_context;
>     >     +  int node;
>     >     +
>     >     +  if (strcmp(serial, "uart0") == 0) {
>     >     +
>     >     +    rtems_termios_device_context_initialize(&ctx->base, "UART");
>     >     +    node = fdt_path_offset(fdt, serial);
>     >     +    ctx->regs = get_reg_of_node(fdt, node);
>     >     +  }
>     >     +
>     >     +  rtems_termios_device_install(
>     >     +    "/dev/ttyuart0",
>     >     +    &arm_pl011_fns,
>     >     +    NULL,
>     >     +    &pl011_context.base
>     >     +  );
>     >     +}
>     >     +
>     >     +static void register_fb( void )
>     >     +{
>     >     +  if (fbcons_probe(&fb_context.base) == true) {
>     >     +    rtems_termios_device_install(
>     >     +      "/dev/fbcons",
>     >     +      &fbcons_fns,
>     >     +      NULL,
>     >     +      &fb_context.base);
>     >     +  }
>     >     +}
>     >     +
>     >     +static void console_select( const char *console )
>     >     +{
>     >     +  const char *opt;
>     >     +
>     >     +  opt = rpi_cmdline_get_arg("--console=");
>     >     +
>     >     +  if ( opt ) {
>     >     +    if ( strncmp( opt, "fbcons", sizeof( "fbcons" ) - 1 ) ==
>     0 ) {
>     >     +      if ( rpi_video_is_initialized() > 0 ) {
>     >     +        BSP_output_char = output_char_fb;
>     >     +        link("/dev/fbcons", CONSOLE_DEVICE_NAME);
>     >     +      }
>     >     +    }else{
>     >     +
>     >     +      if ( console == NULL ){
>     >     +        bsp_fatal( BSP_FATAL_CONSOLE_NO_DEV );
>     >     +      }
>     >     +      BSP_output_char = output_char_serial;
>     >     +      link("/dev/ttyuart0", CONSOLE_DEVICE_NAME);
>     >     +    }
>     >     +  }
>     >     +}
>     >     +
>     >     +static void uart_probe(void)
>     >     +{
>     >     +  const void *fdt;
>     >     +  const char *console;
>     >     +  int node;
>     >     +
>     >     +  fdt = bsp_fdt_get();
>     >     +  node = fdt_path_offset(fdt, "/chosen");
>     >     +
>     >     +  console = fdt_getprop(fdt, node, "stdout-path", NULL);
>     >     +
>     >     +  node = fdt_path_offset(fdt, "/aliases");
>     >     +
>     >     +  int offset = fdt_first_property_offset(fdt, node);
>     >     +
>     >     +  while (offset >= 0) {
>     >     +    const struct fdt_property *prop;
>     >     +
>     >     +    prop = fdt_get_property_by_offset(fdt, offset, NULL);
>     >     +
>     >     +    if (prop != NULL) {
>     >     +      const char *name;
>     >     +
>     >     +      name = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
>     >     +      if(strstr(name, "serial") != NULL) {
>     >     +        const char *serial;
>     >     +        serial = prop->data;
>     >     +
>     >     +        register_arm_pl011(fdt, serial);
>     >     +      }
>     >     +    }
>     >     +
>     >     +    offset = fdt_next_property_offset(fdt, offset);
>     >     +  }
>     >     +  console_select(console);
>     >     +}
>     >     +
>     >     +
>     >     +rtems_status_code console_initialize(
>     >     +  rtems_device_major_number major,
>     >     +  rtems_device_minor_number minor,
>     >     +  void *arg
>     >     +)
>     >     +{
>     >     +  rtems_termios_initialize();
>     >     +  uart_probe();
>     >     +  register_fb();
>     >     +
>     >     +  return RTEMS_SUCCESSFUL;
>     >     +}
>     >     +
>     >     +BSP_output_char_function_type BSP_output_char =
>     output_char_serial;
>     >
>     >      BSP_polling_getchar_function_type BSP_poll_char = NULL;
>     >     +
>     >     +RTEMS_SYSINIT_ITEM(
>     >     +  uart_probe,
>     >     +  RTEMS_SYSINIT_BSP_START,
>     >     +  RTEMS_SYSINIT_ORDER_LAST
>     >     +);
>     >     \ No newline at end of file
>     >     diff --git a/bsps/arm/raspberrypi/console/console_select.c
>     >     b/bsps/arm/raspberrypi/console/console_select.c
>     >     deleted file mode 100644
>     >     index bd246ca868..0000000000
>     >     --- a/bsps/arm/raspberrypi/console/console_select.c
>     >     +++ /dev/null
>     >     @@ -1,114 +0,0 @@
>     >     -/**
>     >     - * @file
>     >     - *
>     >     - * @ingroup raspberrypi_console
>     >     - *
>     >     - * @brief console select
>     >     - */
>     >     -
>     >     -/*
>     >     - * Copyright (c) 2015 Yang Qiao
>     >     - *
>     >     - *  The license and distribution terms for this file may be
>     >     - *  found in the file LICENSE in this distribution or at
>     >     - *
>     >     - *  http://www.rtems.org/license/LICENSE
>     >     - *
>     >     - */
>     >     -
>     >     -#include <bsp.h>
>     >     -#include <bsp/fatal.h>
>     >     -#include <rtems/libio.h>
>     >     -#include <stdlib.h>
>     >     -#include <string.h>
>     >     -#include <assert.h>
>     >     -#include <termios.h>
>     >     -
>     >     -#include <rtems/termiostypes.h>
>     >     -#include <libchip/serial.h>
>     >     -#include "../../shared/dev/serial/legacy-console.h"
>     >     -#include <bsp/rpi-fb.h>
>     >     -
>     >     -rtems_device_minor_number BSPPrintkPort = 0;
>     >     -
>     >     -/*
>     >     - * Method to return true if the device associated with the
>     >     - * minor number probs available.
>     >     - */
>     >     -static bool bsp_Is_Available( rtems_device_minor_number minor )
>     >     -{
>     >     -  console_tbl *cptr = Console_Port_Tbl[ minor ];
>     >     -
>     >     -  /*
>     >     -   * First perform the configuration dependent probe, then the
>     >     -   * device dependent probe
>     >     -   */
>     >     -  if ( ( !cptr->deviceProbe || cptr->deviceProbe( minor ) ) &&
>     >     -       cptr->pDeviceFns->deviceProbe( minor ) ) {
>     >     -    return true;
>     >     -  }
>     >     -
>     >     -  return false;
>     >     -}
>     >     -
>     >     -/*
>     >     - * Method to return the first available device.
>     >     - */
>     >     -static rtems_device_minor_number bsp_First_Available_Device(
>     void )
>     >     -{
>     >     -  rtems_device_minor_number minor;
>     >     -
>     >     -  for ( minor = 0; minor < Console_Port_Count; minor++ ) {
>     >     -    console_tbl *cptr = Console_Port_Tbl[ minor ];
>     >     -
>     >     -    /*
>     >     -     * First perform the configuration dependent probe, then the
>     >     -     * device dependent probe
>     >     -     */
>     >     -
>     >     -    if ( ( !cptr->deviceProbe || cptr->deviceProbe( minor ) ) &&
>     >     -         cptr->pDeviceFns->deviceProbe( minor ) ) {
>     >     -      return minor;
>     >     -    }
>     >     -  }
>     >     -
>     >     -  /*
>     >     -   *  Error No devices were found.  We will want to bail here.
>     >     -   */
>     >     -  bsp_fatal( BSP_FATAL_CONSOLE_NO_DEV );
>     >     -}
>     >     -
>     >     -void bsp_console_select( void )
>     >     -{
>     >     -  /*
>     >     -   *  Reset Console_Port_Minor and
>     >     -   *  BSPPrintkPort here if desired.
>     >     -   *
>     >     -   *  This default version allows the bsp to set these
>     >     -   *  values at creation and will not touch them again
>     >     -   *  unless the selected port number is not available.
>     >     -   */
>     >     -  const char *opt;
>     >     -
>     >     -  Console_Port_Minor = BSP_CONSOLE_UART0;
>     >     -  BSPPrintkPort = BSP_CONSOLE_UART0;
>     >     -
>     >     -  opt = rpi_cmdline_get_arg( "--console=" );
>     >     -
>     >     -  if ( opt ) {
>     >     -    if ( strncmp( opt, "fbcons", sizeof( "fbcons" ) - 1 ) ==
>     0 ) {
>     >     -      if ( rpi_video_is_initialized() > 0 ) {
>     >     -        Console_Port_Minor = BSP_CONSOLE_FB;
>     >     -        BSPPrintkPort = BSP_CONSOLE_FB;
>     >     -      }
>     >     -    }
>     >     -  }
>     >     -
>     >     -  /*
>     >     -   * If the device that was selected isn't available then
>     >     -   * let the user know and select the first available device.
>     >     -   */
>     >     -  if ( !bsp_Is_Available( Console_Port_Minor ) ) {
>     >     -    Console_Port_Minor = bsp_First_Available_Device();
>     >     -  }
>     >     -}
>     >     diff --git a/bsps/arm/raspberrypi/console/fbcons.c
>     >     b/bsps/arm/raspberrypi/console/fbcons.c
>     >     index 3669ba458d..0e6a430c54 100644
>     >     --- a/bsps/arm/raspberrypi/console/fbcons.c
>     >     +++ b/bsps/arm/raspberrypi/console/fbcons.c
>     >     @@ -18,6 +18,7 @@
>     >
>     >      #include <rtems.h>
>     >      #include <rtems/libio.h>
>     >     +#include <rtems/termiostypes.h>
>     >
>     >      #include <stdlib.h>
>     >
>     >     @@ -29,15 +30,6 @@
>     >      #include <bsp/vc.h>
>     >      #include <bsp/rpi-fb.h>
>     >
>     >     -/*
>     >     - *  fbcons_init
>     >     - *
>     >     - *  This function initializes the fb console to a quiecsent
>     state.
>     >     - */
>     >     -static void fbcons_init( int minor )
>     >     -{
>     >     -}
>     >     -
>     >      /*
>     >       *  fbcons_open
>     >       *
>     >     @@ -45,13 +37,14 @@ static void fbcons_init( int minor )
>     >       *
>     >       *  Default state is 9600 baud, 8 bits, No parity, and 1 stop
>     bit.
>     >       */
>     >     -static int fbcons_open(
>     >     -  int   major,
>     >     -  int   minor,
>     >     -  void *arg
>     >     +static bool fbcons_open(
>     >     +  struct rtems_termios_tty *tty,
>     >     +  rtems_termios_device_context *base,
>     >     +  struct termios *term,
>     >     +  rtems_libio_open_close_args_t *args
>     >      )
>     >      {
>     >     -  return RTEMS_SUCCESSFUL;
>     >     +  return true;
>     >      }
>     >
>     >      /*
>     >     @@ -59,13 +52,12 @@ static int fbcons_open(
>     >       *
>     >       *  This function shuts down the requested port.
>     >       */
>     >     -static int fbcons_close(
>     >     -  int   major,
>     >     -  int   minor,
>     >     -  void *arg
>     >     +static void fbcons_close(
>     >     +  struct rtems_termios_tty *tty,
>     >     +  rtems_termios_device_context *base,
>     >     +  rtems_libio_open_close_args_t *args
>     >      )
>     >      {
>     >     -  return ( RTEMS_SUCCESSFUL );
>     >      }
>     >
>     >      /*
>     >     @@ -73,8 +65,8 @@ static int fbcons_close(
>     >       *
>     >       *  This routine polls out the requested character.
>     >       */
>     >     -static void fbcons_write_polled(
>     >     -  int  minor,
>     >     +void fbcons_write_polled(
>     >     +  rtems_termios_device_context *base,
>     >        char c
>     >      )
>     >      {
>     >     @@ -90,8 +82,8 @@ static void fbcons_write_polled(
>     >       *  Console Termios output entry point when using polled output.
>     >       *
>     >       */
>     >     -static ssize_t fbcons_write_support_polled(
>     >     -  int         minor,
>     >     +static void fbcons_write_support_polled(
>     >     +  rtems_termios_device_context *base,
>     >        const char *buf,
>     >        size_t      len
>     >      )
>     >     @@ -102,14 +94,9 @@ static ssize_t fbcons_write_support_polled(
>     >         * poll each byte in the string out of the port.
>     >         */
>     >        while ( nwrite < len ) {
>     >     -    fbcons_write_polled( minor, *buf++ );
>     >     +    fbcons_write_polled( base, *buf++ );
>     >          nwrite++;
>     >        }
>     >     -
>     >     -  /*
>     >     -   * return the number of bytes written.
>     >     -   */
>     >     -  return nwrite;
>     >      }
>     >
>     >      /*
>     >     @@ -117,7 +104,9 @@ static ssize_t fbcons_write_support_polled(
>     >       *
>     >       *  Console Termios polling input entry point.
>     >       */
>     >     -static int fbcons_inbyte_nonblocking_polled( int minor )
>     >     +int fbcons_inbyte_nonblocking_polled(
>     >     +  rtems_termios_device_context *base
>     >     +)
>     >      {
>     >        // if( rtems_kbpoll() ) {
>     >        //   int c = getch();
>     >     @@ -133,15 +122,17 @@ static int fbcons_inbyte_nonblocking_polled(
>     >     int minor )
>     >       *  This function sets the UART channel to reflect the requested
>     >     termios
>     >       *  port settings.
>     >       */
>     >     -static int fbcons_set_attributes(
>     >     -  int                   minor,
>     >     +static bool fbcons_set_attributes(
>     >     +  rtems_termios_device_context *base,
>     >        const struct termios *t
>     >      )
>     >      {
>     >     -  return 0;
>     >     +  return true;
>     >      }
>     >
>     >     -bool fbcons_probe( int minor )
>     >     +bool fbcons_probe(
>     >     +  rtems_termios_device_context *context
>     >     +)
>     >      {
>     >        // rtems_status_code status;
>     >        static bool firstTime = true;
>     >     @@ -163,15 +154,12 @@ bool fbcons_probe( int minor )
>     >        return ret;
>     >      }
>     >
>     >     -const console_fns fbcons_fns =
>     >     +const rtems_termios_device_handler fbcons_fns =
>     >      {
>     >     -  .deviceProbe = libchip_serial_default_probe,     /*
>     deviceProbe */
>     >     -  .deviceFirstOpen = fbcons_open,                 /*
>     deviceFirstOpen */
>     >     -  .deviceLastClose = fbcons_close,                /*
>     deviceLastClose */
>     >     -  .deviceRead = fbcons_inbyte_nonblocking_polled, /*
>     deviceRead */
>     >     -  .deviceWrite = fbcons_write_support_polled,     /*
>     deviceWrite */
>     >     -  .deviceInitialize = fbcons_init,                /*
>     >     deviceInitialize */
>     >     -  .deviceWritePolled = fbcons_write_polled,       /*
>     >     deviceWritePolled */
>     >     -  .deviceSetAttributes = fbcons_set_attributes,   /*
>     >     deviceSetAttributes */
>     >     -  .deviceOutputUsesInterrupts = FALSE,           /*
>     >     deviceOutputUsesInterrupts*/
>     >     -};
>     >     +  .first_open = fbcons_open,
>     >     +  .last_close = fbcons_close,
>     >     +  .poll_read = fbcons_inbyte_nonblocking_polled,
>     >     +  .write = fbcons_write_support_polled,
>     >     +  .set_attributes = fbcons_set_attributes,
>     >     +  .mode = TERMIOS_POLLED
>     >     +};
>     >     \ No newline at end of file
>     >     diff --git a/bsps/arm/raspberrypi/console/usart.c
>     >     b/bsps/arm/raspberrypi/console/usart.c
>     >     deleted file mode 100644
>     >     index 25fb523621..0000000000
>     >     --- a/bsps/arm/raspberrypi/console/usart.c
>     >     +++ /dev/null
>     >     @@ -1,167 +0,0 @@
>     >     -/**
>     >     - * @file
>     >     - *
>     >     - * @ingroup raspberrypi_usart
>     >     - *
>     >     - * @brief USART support.
>     >     - */
>     >     -
>     >     -/*
>     >     - * Copyright (c) 2013 Alan Cudmore
>     >     - *
>     >     - *  The license and distribution terms for this file may be
>     >     - *  found in the file LICENSE in this distribution or at
>     >     - *
>     >     - *  http://www.rtems.org/license/LICENSE
>     >     - *
>     >     - */
>     >     -
>     >     -#include <libchip/sersupp.h>
>     >     -
>     >     -#include <bsp.h>
>     >     -#include <bsp/irq.h>
>     >     -#include <bsp/usart.h>
>     >     -#include <bsp/raspberrypi.h>
>     >     -#include <rtems/bspIo.h>
>     >     -
>     >     -static void usart_delay(uint32_t n)
>     >     -{
>     >     - volatile uint32_t i = 0;
>     >     -
>     >     - for(i = 0; i < n; i++)
>     >     -   ;
>     >     -}
>     >     -
>     >     -#if 0
>     >     -/*
>     >     - *  These will be useful when the driver supports interrupt
>     driven IO.
>     >     - */
>     >     -static rtems_vector_number usart_get_irq_number(const
>     console_tbl *ct)
>     >     -{
>     >     -  return ct->ulIntVector;
>     >     -}
>     >     -
>     >     -static uint32_t usart_get_baud(const console_tbl *ct)
>     >     -{
>     >     -  return ct->ulClock;
>     >     -}
>     >     -#endif
>     >     -
>     >     -static void usart_set_baud(int minor, int baud)
>     >     -{
>     >     - /*
>     >     -  * Nothing for now
>     >     -  */
>     >     - return;
>     >     -}
>     >     -
>     >     -static void usart_initialize(int minor)
>     >     -{
>     >     -  unsigned int gpio_reg;
>     >     -
>     >     -  /*
>     >     -  ** Program GPIO pins for UART 0
>     >     -  */
>     >     -  gpio_reg = BCM2835_REG(BCM2835_GPIO_GPFSEL1);
>     >     -  gpio_reg &= ~(7<<12);    /* gpio14 */
>     >     -  gpio_reg |=  (4<<12);    /* alt0   */
>     >     -  gpio_reg &= ~(7<<15);    /* gpio15 */
>     >     -  gpio_reg |=  (4<<15);    /* alt0   */
>     >     -  BCM2835_REG(BCM2835_GPIO_GPFSEL1) = gpio_reg;
>     >     -
>     >     -  BCM2835_REG(BCM2835_GPIO_GPPUD) = 0;
>     >     -  usart_delay(150);
>     >     -  BCM2835_REG(BCM2835_GPIO_GPPUDCLK0) = (1<<14)|(1<<15);
>     >     -  usart_delay(150);
>     >     -  BCM2835_REG(BCM2835_GPIO_GPPUDCLK0) = 0;
>     >     -
>     >     -  /*
>     >     -  ** Init the PL011 UART
>     >     -  */
>     >     -  BCM2835_REG(BCM2835_UART0_CR)   = 0;
>     >     -  BCM2835_REG(BCM2835_UART0_ICR)  = 0x7FF;
>     >     -  BCM2835_REG(BCM2835_UART0_IMSC) = 0;
>     >     -  BCM2835_REG(BCM2835_UART0_IBRD) = 1;
>     >     -  BCM2835_REG(BCM2835_UART0_FBRD) = 40;
>     >     -  BCM2835_REG(BCM2835_UART0_LCRH) = 0x70;
>     >     -  BCM2835_REG(BCM2835_UART0_RSRECR) =  0;
>     >     -
>     >     -  BCM2835_REG(BCM2835_UART0_CR)   = 0x301;
>     >     -
>     >     -  BCM2835_REG(BCM2835_UART0_IMSC) = BCM2835_UART0_IMSC_RX;
>     >     -
>     >     -  usart_set_baud(minor, 115000);
>     >     -}
>     >     -
>     >     -static int usart_first_open(int major, int minor, void *arg)
>     >     -{
>     >     -  rtems_libio_open_close_args_t *oc =
>     >     (rtems_libio_open_close_args_t *) arg;
>     >     -  struct rtems_termios_tty *tty = (struct rtems_termios_tty *)
>     >     oc->iop->data1;
>     >     -  const console_tbl *ct = Console_Port_Tbl [minor];
>     >     -  console_data *cd = &Console_Port_Data [minor];
>     >     -
>     >     -  cd->termios_data = tty;
>     >     -  rtems_termios_set_initial_baud(tty, ct->ulClock);
>     >     -
>     >     -  return 0;
>     >     -}
>     >     -
>     >     -static int usart_last_close(int major, int minor, void *arg)
>     >     -{
>     >     -  return 0;
>     >     -}
>     >     -
>     >     -static int usart_read_polled(int minor)
>     >     -{
>     >     -  if (minor == 0) {
>     >     -    if (((BCM2835_REG(BCM2835_UART0_FR)) & BCM2835_UART0_FR_RXFE)
>     >     == 0) {
>     >     -       return((BCM2835_REG(BCM2835_UART0_DR)) & 0xFF );
>     >     -    } else {
>     >     -      return -1;
>     >     -    }
>     >     -  } else {
>     >     -    printk("Unknown console minor number: %d\n", minor);
>     >     -    return -1;
>     >     -  }
>     >     -}
>     >     -
>     >     -static void usart_write_polled(int minor, char c)
>     >     -{
>     >     -   while (1) {
>     >     -     if ((BCM2835_REG(BCM2835_UART0_FR) &
>     BCM2835_UART0_FR_TXFF) == 0)
>     >     -       break;
>     >     -   }
>     >     -   BCM2835_REG(BCM2835_UART0_DR) = c;
>     >     -}
>     >     -
>     >     -static ssize_t usart_write_support_polled(
>     >     -  int minor,
>     >     -  const char *s,
>     >     -  size_t n
>     >     -)
>     >     -{
>     >     -  ssize_t i = 0;
>     >     -
>     >     -  for (i = 0; i < n; ++i) {
>     >     -    usart_write_polled(minor, s [i]);
>     >     -  }
>     >     -
>     >     -  return n;
>     >     -}
>     >     -
>     >     -static int usart_set_attributes(int minor, const struct
>     termios *term)
>     >     -{
>     >     -  return -1;
>     >     -}
>     >     -
>     >     -const console_fns bcm2835_usart_fns = {
>     >     -  .deviceProbe = libchip_serial_default_probe,
>     >     -  .deviceFirstOpen = usart_first_open,
>     >     -  .deviceLastClose = usart_last_close,
>     >     -  .deviceRead = usart_read_polled,
>     >     -  .deviceWrite = usart_write_support_polled,
>     >     -  .deviceInitialize = usart_initialize,
>     >     -  .deviceWritePolled = usart_write_polled,
>     >     -  .deviceSetAttributes = usart_set_attributes,
>     >     -  .deviceOutputUsesInterrupts = false
>     >     -};
>     >     diff --git a/bsps/arm/raspberrypi/include/bsp/fbcons.h
>     >     b/bsps/arm/raspberrypi/include/bsp/fbcons.h
>     >     index d0e126699a..9bdb4b115e 100644
>     >     --- a/bsps/arm/raspberrypi/include/bsp/fbcons.h
>     >     +++ b/bsps/arm/raspberrypi/include/bsp/fbcons.h
>     >     @@ -33,12 +33,29 @@ extern "C" {
>     >
>     >      #define FB_CONSOLE 0x50492835
>     >
>     >     -bool fbcons_probe( int minor );
>     >     +bool fbcons_probe(
>     >     +  rtems_termios_device_context *base
>     >     + );
>     >     +
>     >     +void fbcons_write_polled(
>     >     +  rtems_termios_device_context *base,
>     >     +  char c
>     >     +);
>     >     +
>     >     +int fbcons_inbyte_nonblocking_polled(
>     >     +  rtems_termios_device_context *base
>     >     +);
>     >     +
>     >     +void output_char_fb(char c);
>     >     +
>     >     +typedef struct {
>     >     +    rtems_termios_device_context base;
>     >     +} rpi_fb_context ;
>     >
>     >      /*
>     >       * Driver function table
>     >       */
>     >     -extern const console_fns fbcons_fns;
>     >     +extern const rtems_termios_device_handler fbcons_fns;
>     >
>     >      #ifdef __cplusplus
>     >      }
>     >     diff --git a/bsps/arm/raspberrypi/include/bsp/raspberrypi.h
>     >     b/bsps/arm/raspberrypi/include/bsp/raspberrypi.h
>     >     index 40c80cf408..e052c2becb 100644
>     >     --- a/bsps/arm/raspberrypi/include/bsp/raspberrypi.h
>     >     +++ b/bsps/arm/raspberrypi/include/bsp/raspberrypi.h
>     >     @@ -24,6 +24,7 @@
>     >      #include <bspopts.h>
>     >      #include <stdint.h>
>     >      #include <bsp/utility.h>
>     >     +#include <rtems/termiostypes.h>
>     >
>     >      /**
>     >       * @defgroup raspberrypi_reg Register Definitions
>     >     @@ -60,6 +61,17 @@
>     >
>     >      #define RPI_PERIPHERAL_SIZE         0x01000000
>     >
>     >     +/**
>     >     + * @name Console select definitions
>     >     + *
>     >     + * @{
>     >     + */
>     >     +
>     >     +#define PL011 0
>     >     +#define FB    1
>     >     +
>     >     +/** @} */
>     >     +
>     >      /**
>     >       * @name Internal ARM Timer Registers
>     >       *
>     >     @@ -184,42 +196,6 @@
>     >
>     >      /** @} */
>     >
>     >     -/**
>     >     - * @name UART 0 (PL011) Registers
>     >     - *
>     >     - * @{
>     >     - */
>     >     -
>     >     -#define BCM2835_UART0_BASE       (RPI_PERIPHERAL_BASE + 0x201000)
>     >     -
>     >     -#define BCM2835_UART0_DR         (BCM2835_UART0_BASE + 0x00)
>     >     -#define BCM2835_UART0_RSRECR     (BCM2835_UART0_BASE + 0x04)
>     >     -#define BCM2835_UART0_FR         (BCM2835_UART0_BASE + 0x18)
>     >     -#define BCM2835_UART0_ILPR       (BCM2835_UART0_BASE + 0x20)
>     >     -#define BCM2835_UART0_IBRD       (BCM2835_UART0_BASE + 0x24)
>     >     -#define BCM2835_UART0_FBRD       (BCM2835_UART0_BASE + 0x28)
>     >     -#define BCM2835_UART0_LCRH       (BCM2835_UART0_BASE + 0x2C)
>     >     -#define BCM2835_UART0_CR         (BCM2835_UART0_BASE + 0x30)
>     >     -#define BCM2835_UART0_IFLS       (BCM2835_UART0_BASE + 0x34)
>     >     -#define BCM2835_UART0_IMSC       (BCM2835_UART0_BASE + 0x38)
>     >     -#define BCM2835_UART0_RIS        (BCM2835_UART0_BASE + 0x3C)
>     >     -#define BCM2835_UART0_MIS        (BCM2835_UART0_BASE + 0x40)
>     >     -#define BCM2835_UART0_ICR        (BCM2835_UART0_BASE + 0x44)
>     >     -#define BCM2835_UART0_DMACR      (BCM2835_UART0_BASE + 0x48)
>     >     -#define BCM2835_UART0_ITCR       (BCM2835_UART0_BASE + 0x80)
>     >     -#define BCM2835_UART0_ITIP       (BCM2835_UART0_BASE + 0x84)
>     >     -#define BCM2835_UART0_ITOP       (BCM2835_UART0_BASE + 0x88)
>     >     -#define BCM2835_UART0_TDR        (BCM2835_UART0_BASE + 0x8C)
>     >     -
>     >     -#define BCM2835_UART0_MIS_RX    0x10
>     >     -#define BCM2835_UART0_MIS_TX    0x20
>     >     -#define BCM2835_UART0_IMSC_RX   0x10
>     >     -#define BCM2835_UART0_IMSC_TX   0x20
>     >     -#define BCM2835_UART0_FR_RXFE   0x10
>     >     -#define BCM2835_UART0_FR_TXFF   0x20
>     >     -#define BCM2835_UART0_ICR_RX    0x10
>     >     -#define BCM2835_UART0_ICR_TX    0x20
>     >     -
>     >      /** @} */
>     >
>     >      /**
>     >     diff --git a/bsps/arm/raspberrypi/include/bsp/usart.h
>     >     b/bsps/arm/raspberrypi/include/bsp/usart.h
>     >     index d3e710c5e9..abbf53626c 100644
>     >     --- a/bsps/arm/raspberrypi/include/bsp/usart.h
>     >     +++ b/bsps/arm/raspberrypi/include/bsp/usart.h
>     >     @@ -32,9 +32,8 @@
>     >      extern "C" {
>     >      #endif /* __cplusplus */
>     >
>     >     -#define USART0_DEFAULT_BAUD 115000
>     >     -
>     >     -extern const console_fns bcm2835_usart_fns;
>     >     +#define PL011_DEFAULT_BAUD 115000
>     >     +#define BCM2835_PL011_BASE (RPI_PERIPHERAL_BASE + 0x201000)
>     >
>     >      #ifdef __cplusplus
>     >      }
>     >     diff --git a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>     >     b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>     >     index 11a22f89e3..0e0d5bef67 100644
>     >     --- a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>     >     +++ b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>     >     @@ -42,6 +42,7 @@ librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/start/bspfatal-default.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/dev/cpucounter/cpucounterfrequency.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/dev/cpucounter/cpucounterread.c
>     >      librtemsbsp_a_SOURCES +=
>     ../../../../../../bsps/shared/start/sbrk.c
>     >     +librtemsbsp_a_SOURCES +=
>     ../../../../../../bsps/shared/start/bsp-fdt.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/start/stackalloc.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/shared/start/bsp-start-memcpy.S
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/shared/cp15/arm-cp15-set-ttb-entries.c
>     >     @@ -63,14 +64,13 @@ librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/shared/cp15/arm-cp15-set-exc
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/irq/irq.c
>     >
>     >      # Console
>     >     -librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/dev/serial/legacy-console.c
>     >     -librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/dev/serial/legacy-console-control.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/console/console-config.c
>     >     -librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/console/console_select.c
>     >     -librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/console/usart.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/console/fb.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/console/fbcons.c
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/console/outch.c
>     >     +librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/dev/serial/console-termios.c
>     >     +librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/shared/dev/serial/console-termios-init.c
>     >     +librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/shared/serial/arm-pl011.c
>     >
>     >      # Mailbox
>     >      librtemsbsp_a_SOURCES +=
>     >     ../../../../../../bsps/arm/raspberrypi/start/mailbox.c
>     >     --
>     >     2.17.1
>     >
> 


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