source: rtems/c/src/lib/libcpu/mips/clock/ckinit.c @ 86c9eb0

4.104.114.84.95
Last change on this file since 86c9eb0 was 86c9eb0, checked in by Joel Sherrill <joel.sherrill@…>, on Jan 11, 2000 at 2:57:41 PM

Bug fix from Wayne Bullaughey <wayneb@…> to use the complement
of the mask when disabling the interrupt.

  • Property mode set to 100644
File size: 5.9 KB
Line 
1
2/*  ckinit.c
3 *
4 *  This file contains the clock driver initialization for the IDT 4650.
5 *
6 *  Author:     Craig Lebakken <craigl@transition.com>
7 *
8 *  COPYRIGHT (c) 1996 by Transition Networks Inc.
9 *
10 *  To anyone who acknowledges that this file is provided "AS IS"
11 *  without any express or implied warranty:
12 *      permission to use, copy, modify, and distribute this file
13 *      for any purpose is hereby granted without fee, provided that
14 *      the above copyright notice and this notice appears in all
15 *      copies, and that the name of Transition Networks not be used in
16 *      advertising or publicity pertaining to distribution of the
17 *      software without specific, written prior permission.
18 *      Transition Networks makes no representations about the suitability
19 *      of this software for any purpose.
20 *
21 *  Derived from c/src/lib/libbsp/no_cpu/no_bsp/clock/ckinit.c:
22 *
23 *  COPYRIGHT (c) 1989-1999.
24 *  On-Line Applications Research Corporation (OAR).
25 *
26 *  The license and distribution terms for this file may be
27 *  found in the file LICENSE in this distribution or at
28 *  http://www.OARcorp.com/rtems/license.html.
29 *
30 *  $Id$
31 */
32
33/*
34 *  Rather than deleting this, it is commented out to (hopefully) help
35 *  the submitter send updates.
36 *
37 *  static char _sccsid[] = "@(#)ckinit.c 08/20/96     1.3\n";
38 */
39
40
41#include <stdlib.h>
42
43#include <rtems.h>
44#include <rtems/libio.h>
45
46#define EXT_INT5    0x8000  /* external interrupt 5 */
47
48#include "clock.h"
49
50/* formerly in the BSP */
51#if 0
52#define CLOCKS_PER_MICROSECOND ( CPU_CLOCK_RATE_MHZ ) /* equivalent to CPU clock speed in MHz */
53#endif
54
55#define CLOCKS_PER_MICROSECOND \
56  rtems_cpu_configuration_get_clicks_per_microsecond()
57/* to avoid including the bsp */
58mips_isr_entry set_vector( rtems_isr_entry, rtems_vector_number, int );
59
60void Clock_exit( void );
61rtems_isr Clock_isr( rtems_vector_number vector );
62
63
64/*
65 *  The interrupt vector number associated with the clock tick device
66 *  driver.
67 */
68
69#define CLOCK_VECTOR_MASK    EXT_INT5
70#define CLOCK_VECTOR         0x7
71
72/*
73 *  Clock_driver_ticks is a monotonically increasing counter of the
74 *  number of clock ticks since the driver was initialized.
75 */
76
77volatile rtems_unsigned32 Clock_driver_ticks;
78
79/*
80 *  Clock_isrs is the number of clock ISRs until the next invocation of
81 *  the RTEMS clock tick routine.  The clock tick device driver
82 *  gets an interrupt once a millisecond and counts down until the
83 *  length of time between the user configured microseconds per tick
84 *  has passed.
85 */
86
87rtems_unsigned32 Clock_isrs;              /* ISRs until next tick */
88
89/*
90 * These are set by clock driver during its init
91 */
92 
93rtems_device_major_number rtems_clock_major = ~0;
94rtems_device_minor_number rtems_clock_minor;
95
96/*
97 *  The previous ISR on this clock tick interrupt vector.
98 */
99
100rtems_isr_entry  Old_ticker;
101
102void Clock_exit( void );
103
104static unsigned32 mips_timer_rate = 0;
105
106/*
107 *  Isr Handler
108 */
109
110rtems_isr Clock_isr(
111  rtems_vector_number vector
112)
113{
114/*
115 * bump the number of clock driver ticks since initialization
116 *
117 * determine if it is time to announce the passing of tick as configured
118 * to RTEMS through the rtems_clock_tick directive
119 *
120 * perform any timer dependent tasks
121 */
122
123  /* refresh the internal CPU timer */
124  mips_set_timer( mips_timer_rate );
125
126  Clock_driver_ticks += 1;
127
128  rtems_clock_tick();
129}
130
131/* User callback shell (set from Clock_Control) */
132static void (*user_callback)(void);
133
134rtems_isr User_Clock_isr(
135  rtems_vector_number vector
136)
137{
138   /* refresh the internal CPU timer */
139   mips_set_timer( mips_timer_rate );
140
141   if (user_callback)
142      user_callback();
143}
144
145/*
146 *  Install_clock
147 *
148 *  Install a clock tick handleR and reprograms the chip.  This
149 *  is used to initially establish the clock tick.
150 */
151
152void Install_clock(
153  rtems_isr_entry clock_isr
154)
155{
156  /*
157   *  Initialize the clock tick device driver variables
158   */
159
160  Clock_driver_ticks = 0;
161  Clock_isrs = rtems_configuration_get_milliseconds_per_tick();
162
163  /*
164   *  If ticks_per_timeslice is configured as non-zero, then the user
165   *  wants a clock tick.
166   */
167
168  if ( rtems_configuration_get_ticks_per_timeslice() ) {
169    Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 );
170    /*
171     *  Hardware specific initialize goes here
172     */
173
174    mips_timer_rate = rtems_configuration_get_microseconds_per_tick() * CLOCKS_PER_MICROSECOND;
175    mips_set_timer( mips_timer_rate );
176    enable_int(CLOCK_VECTOR_MASK);
177  }
178
179  /*
180   *  Schedule the clock cleanup routine to execute if the application exits.
181   */
182
183  atexit( Clock_exit );
184}
185
186/*
187 *  Clean up before the application exits
188 */
189
190void Clock_exit( void )
191{
192  if ( rtems_configuration_get_ticks_per_timeslice() ) {
193    /* mips: turn off the timer interrupts */
194    disable_int(~CLOCK_VECTOR_MASK);
195  }
196}
197
198/*
199 *  Clock_initialize
200 *
201 *  Device driver entry point for clock tick driver initialization.
202 */
203
204rtems_device_driver Clock_initialize(
205  rtems_device_major_number major,
206  rtems_device_minor_number minor,
207  void *pargp
208)
209{
210  Install_clock( Clock_isr );
211 
212  /*
213   * make major/minor avail to others such as shared memory driver
214   */
215 
216  rtems_clock_major = major;
217  rtems_clock_minor = minor;
218 
219  return RTEMS_SUCCESSFUL;
220}
221
222rtems_device_driver Clock_control(
223  rtems_device_major_number major,
224  rtems_device_minor_number minor,
225  void *pargp
226)
227{
228    rtems_unsigned32 isrlevel;
229    rtems_libio_ioctl_args_t *args = pargp;
230 
231    if (args == 0)
232        goto done;
233 
234    /*
235     * This is hokey, but until we get a defined interface
236     * to do this, it will just be this simple...
237     */
238 
239    if (args->command == rtems_build_name('I', 'S', 'R', ' '))
240    {
241        Clock_isr(CLOCK_VECTOR);
242    }
243    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
244    {
245      rtems_interrupt_disable( isrlevel );
246      user_callback = (void (*)(void))args->buffer;
247      (void) set_vector( User_Clock_isr, CLOCK_VECTOR, 1 );
248      rtems_interrupt_enable( isrlevel );
249    }
250 
251done:
252    return RTEMS_SUCCESSFUL;
253}
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