Subversion Repositories HelenOS

Rev

Rev 3925 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /*
  2.  * Copyright (c) 2008 Pavel Rimsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup kbd_port
  30.  * @ingroup  kbd
  31.  * @{
  32.  */
  33. /** @file
  34.  * @brief   Z8350 keyboard port driver.
  35.  * @brief   SGCN (Serengeti Console) keyboard port driver.
  36.  */
  37.  
  38. #include <as.h>
  39. #include <ddi.h>
  40. #include <ipc/ipc.h>
  41. #include <async.h>
  42. #include <kbd.h>
  43. #include <kbd_port.h>
  44. #include <sysinfo.h>
  45. #include <stdio.h>
  46.  
  47. /**
  48.  * SGCN buffer header. It is placed at the very beginning of the SGCN
  49.  * buffer.
  50.  */
  51. typedef struct {
  52.     /** hard-wired to "CON" */
  53.     char magic[4];
  54.    
  55.     /** we don't need this */
  56.     char unused[8];
  57.    
  58.     /** offset within the SGCN buffer of the input buffer start */
  59.     uint32_t in_begin;
  60.    
  61.     /** offset within the SGCN buffer of the input buffer end */
  62.     uint32_t in_end;
  63.    
  64.     /** offset within the SGCN buffer of the input buffer read pointer */
  65.     uint32_t in_rdptr;
  66.    
  67.     /** offset within the SGCN buffer of the input buffer write pointer */
  68.     uint32_t in_wrptr;
  69. } __attribute__ ((packed)) sgcn_buffer_header_t;
  70.  
  71. /*
  72.  * Returns a pointer to the object of a given type which is placed at the given
  73.  * offset from the console buffer beginning.
  74.  */
  75. #define SGCN_BUFFER(type, offset) \
  76.         ((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
  77.  
  78. /** Returns a pointer to the console buffer header. */
  79. #define SGCN_BUFFER_HEADER  (SGCN_BUFFER(sgcn_buffer_header_t, 0))
  80.  
  81. /**
  82.  * Virtual address mapped to SRAM.
  83.  */
  84. static uintptr_t sram_virt_addr;
  85.  
  86. /**
  87.  * SGCN buffer offset within SGCN.
  88.  */
  89. static uintptr_t sram_buffer_offset;
  90.  
  91. static void sgcn_irq_handler(ipc_callid_t iid, ipc_call_t *call);
  92.  
  93.  
  94. /**
  95.  * Initializes the SGCN driver.
  96.  * Maps the physical memory (SRAM) and registers the interrupt.
  97.  */
  98. int kbd_port_init(void)
  99. {
  100.     async_set_interrupt_received(sgcn_irq_handler);
  101.     sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size"));
  102.     if (physmem_map((void *) sysinfo_value("sram.address.physical"),
  103.         (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE,
  104.         AS_AREA_READ | AS_AREA_WRITE) != 0) {
  105.         printf("SGCN: uspace driver could not map physical memory.");
  106.         return -1;
  107.     }
  108.    
  109.     sram_buffer_offset = sysinfo_value("sram.buffer.offset");
  110.     ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"),
  111.         0, (void *) 0);
  112.     return 0;
  113. }
  114.  
  115. /**
  116.  * Handler of the "key pressed" event. Reads codes of all the pressed keys from
  117.  * the buffer.
  118.  */
  119. static void sgcn_irq_handler(ipc_callid_t iid, ipc_call_t *call)
  120. {
  121.     char c;
  122.    
  123.     uint32_t begin = SGCN_BUFFER_HEADER->in_begin;
  124.     uint32_t end = SGCN_BUFFER_HEADER->in_end;
  125.     uint32_t size = end - begin;
  126.    
  127.     volatile char *buf_ptr = (volatile char *)
  128.         SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
  129.     volatile uint32_t *in_wrptr_ptr = &(SGCN_BUFFER_HEADER->in_wrptr);
  130.     volatile uint32_t *in_rdptr_ptr = &(SGCN_BUFFER_HEADER->in_rdptr);
  131.    
  132.     while (*in_rdptr_ptr != *in_wrptr_ptr) {
  133.         c = *buf_ptr;
  134.         *in_rdptr_ptr = (((*in_rdptr_ptr) - begin + 1) % size) + begin;
  135.         buf_ptr = (volatile char *)
  136.             SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
  137.         kbd_push_scancode(c);
  138.     }
  139. }
  140.  
  141. /** @}
  142.  */
  143.