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  1. /*
  2.  * Copyright (c) 2006 Ondrej Palkovsky
  3.  * Copyright (c) 2008 Martin Decky
  4.  * Copyright (c) 2008 Pavel Rimsky
  5.  * All rights reserved.
  6.  *
  7.  * Redistribution and use in source and binary forms, with or without
  8.  * modification, are permitted provided that the following conditions
  9.  * are met:
  10.  *
  11.  * - Redistributions of source code must retain the above copyright
  12.  *   notice, this list of conditions and the following disclaimer.
  13.  * - Redistributions in binary form must reproduce the above copyright
  14.  *   notice, this list of conditions and the following disclaimer in the
  15.  *   documentation and/or other materials provided with the distribution.
  16.  * - The name of the author may not be used to endorse or promote products
  17.  *   derived from this software without specific prior written permission.
  18.  *
  19.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. /** @defgroup niagarafb SGCN
  32.  * @brief   userland driver of the Niagara console output
  33.  * @{
  34.  */
  35. /** @file
  36.  */
  37.  
  38. #include <async.h>
  39. #include <sysinfo.h>
  40. #include <as.h>
  41. #include <errno.h>
  42. #include <stdio.h>
  43. #include <ddi.h>
  44.  
  45. #include "serial_console.h"
  46. #include "niagara.h"
  47.  
  48. #define WIDTH 80
  49. #define HEIGHT 24
  50.  
  51. /**
  52.  * Virtual address mapped to the buffer shared with the kernel counterpart.
  53.  */
  54. static uintptr_t output_buffer_addr;
  55.  
  56. /*
  57.  * Kernel counterpart of the driver reads characters to be printed from here.
  58.  * Keep in sync with the definition from
  59.  * kernel/arch/sparc64/src/drivers/niagara.c.
  60.  */
  61. #define OUTPUT_BUFFER_SIZE  ((PAGE_SIZE) - 2 * 8)
  62. typedef volatile struct {
  63.     uint64_t read_ptr;
  64.     uint64_t write_ptr;
  65.     char data[OUTPUT_BUFFER_SIZE];
  66. }
  67.     __attribute__ ((packed))
  68.     __attribute__ ((aligned(PAGE_SIZE)))
  69.     *output_buffer_t;
  70.  
  71. output_buffer_t output_buffer;
  72.  
  73. /**
  74.  * Pushes the character to the Niagara serial.
  75.  * @param c character to be pushed
  76.  */
  77. static void niagara_putc(char c)
  78. {
  79.     while (output_buffer->write_ptr ==
  80.            (output_buffer->read_ptr + OUTPUT_BUFFER_SIZE - 1)
  81.            % OUTPUT_BUFFER_SIZE)
  82.         ;
  83.     output_buffer->data[output_buffer->write_ptr] = (uint64_t) c;
  84.     output_buffer->write_ptr =
  85.         ((output_buffer->write_ptr) + 1) % OUTPUT_BUFFER_SIZE;
  86. }
  87.  
  88. /**
  89.  * Initializes the Niagara serial driver.
  90.  */
  91. int niagara_init(void)
  92. {
  93.     output_buffer_addr = (uintptr_t) as_get_mappable_page(PAGE_SIZE);
  94.     int result = physmem_map(
  95.         (void *) sysinfo_value("niagara.outbuf.address"),
  96.         (void *) output_buffer_addr,
  97.         1, AS_AREA_READ | AS_AREA_WRITE);
  98.  
  99.     if (result != 0) {
  100.         printf("Niagara: uspace driver couldn't map physical memory: %d\n",
  101.             result);
  102.     }
  103.  
  104.     output_buffer = (output_buffer_t) output_buffer_addr;
  105.  
  106.     serial_console_init(niagara_putc, WIDTH, HEIGHT);
  107.     async_set_client_connection(serial_client_connection);
  108.     return 0;
  109. }
  110.  
  111. /**
  112.  * @}
  113.  */
  114.  
  115.