source: rtems/bsps/powerpc/ss555/start/bspstart.c @ 65f868c

5
Last change on this file since 65f868c was 65f868c, checked in by Sebastian Huber <sebastian.huber@…>, on May 23, 2018 at 12:17:25 PM

Add _CPU_Counter_frequency()

Add rtems_counter_frequency() API function. Use it to initialize the
counter value converter via the new system initialization step
(RTEMS_SYSINIT_CPU_COUNTER). This decouples the counter implementation
and the counter converter. It avoids an unnecessary pull in of the
64-bit integer division from libgcc.

Update #3456.

  • Property mode set to 100644
File size: 2.6 KB
Line 
1/*
2 *  This routine does the bulk of the system initialization.
3 */
4
5/*
6 *  COPYRIGHT (c) 1989-2007.
7 *  On-Line Applications Research Corporation (OAR).
8 *
9 *  The license and distribution terms for this file may be
10 *  found in the file LICENSE in this distribution or at
11 *  http://www.rtems.org/license/LICENSE.
12 *
13 *  SS555 port sponsored by Defence Research and Development Canada - Suffield
14 *  Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca)
15 *
16 *  Derived from c/src/lib/libbsp/powerpc/mbx8xx/startup/bspstart.c:
17 *
18 *  Modifications for MBX860:
19 *  Copyright (c) 1999, National Research Council of Canada
20 */
21
22#include <rtems/bspIo.h>
23#include <rtems/counter.h>
24#include <bsp/bootcard.h>
25#include <rtems/powerpc/powerpc.h>
26
27#include <libcpu/cpuIdent.h>
28#include <libcpu/spr.h>
29
30#include <bsp/irq.h>
31#include <bsp.h>
32
33SPR_RW(SPRG1)
34
35extern unsigned long intrStackPtr;
36
37/*
38 *  Driver configuration parameters
39 */
40uint32_t   bsp_clicks_per_usec;
41uint32_t   bsp_clock_speed;            /* Serial clocks per second */
42
43uint32_t _CPU_Counter_frequency(void)
44{
45  return BSP_CRYSTAL_HZ / 4;
46}
47
48/*
49 *  bsp_start()
50 *
51 *  Board-specific initialization code. Called from the generic boot_card()
52 *  function defined in rtems/c/src/lib/libbsp/shared/main.c. That function
53 *  does some of the board independent initialization. It is called from the
54 *  SS555 entry point _start() defined in
55 *  rtems/c/src/lib/libbsp/powerpc/ss555/start/start.S
56 *
57 *  _start() has set up a stack, has zeroed the .bss section, has set up the
58 *  .data section from contents stored in ROM, has turned off interrupts,
59 *  and placed the processor in the supervisor mode.  boot_card() has left
60 *  the processor in that state when bsp_start() was called.
61 *
62 *  Input parameters: NONE
63 *
64 *  Output parameters: NONE
65 *
66 *  Return values: NONE
67 */
68void bsp_start(void)
69{
70  register unsigned char* intrStack;
71
72  /*
73   * Get CPU identification dynamically.  Note that the get_ppc_cpu_type()
74   * function stores the result in global variables so that it can be used
75   * later.
76   */
77  get_ppc_cpu_type();
78  get_ppc_cpu_revision();
79
80  /*
81   * Initialize some SPRG registers related to irq handling
82   */
83  intrStack = (((unsigned char*)&intrStackPtr) - PPC_MINIMUM_STACK_FRAME_SIZE);
84  _write_SPRG1((unsigned int)intrStack);
85
86  /*
87   * Install our own set of exception vectors
88   */
89  initialize_exceptions();
90
91  /*
92   *  initialize the device driver parameters
93   */
94  bsp_clicks_per_usec = BSP_CRYSTAL_HZ / 4 / 1000000;
95  bsp_clock_speed     = BSP_CLOCK_HZ;   /* for SCI baud rate generator */
96
97  /*
98   * Initalize RTEMS IRQ system
99   */
100  BSP_rtems_irq_mng_init(0);
101}
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