source: rtems/c/src/lib/libbsp/mips/hurricane/clock/ckinit.c @ 34ef6c7

4.104.114.95
Last change on this file since 34ef6c7 was 34ef6c7, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 5, 2008 at 10:06:51 PM

2008-09-05 Joel Sherrill <joel.sherrill@…>

  • clock/ckinit.c: The Shared Memory Driver no longer requires the special IOCTL in Clock_control. This was a hack which has existed since before the Classic API Timer Manager was implemented. All implementations of and references to Clock_control were removed.
  • Property mode set to 100644
File size: 5.2 KB
Line 
1
2/*  ckinit.c
3 *
4 *  This file contains the clock driver initialization for the Hurricane BSP.
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.rtems.com/license/LICENSE.
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
46extern uint32_t bsp_clicks_per_microsecond;
47
48#define EXT_INT1    0x800  /* external interrupt 5 */
49
50#include "clock.h"
51
52/* to avoid including the bsp */
53mips_isr_entry set_vector( rtems_isr_entry, rtems_vector_number, int );
54
55void USC_isr( void );
56void reset_wdt(void);
57void enable_wdi(void);
58void init_hbt(void);
59void enable_hbi(void);
60void disable_hbi(void);
61
62void Clock_exit( void );
63rtems_isr Clock_isr( rtems_vector_number vector );
64
65
66/*
67 *  The interrupt vector number associated with the clock tick device
68 *  driver.
69 */
70
71#define CLOCK_VECTOR_MASK    EXT_INT1
72#define CLOCK_VECTOR         MIPS_INTERRUPT_BASE + 0x3
73
74/*
75 *  Clock_driver_ticks is a monotonically increasing counter of the
76 *  number of clock ticks since the driver was initialized.
77 */
78
79volatile uint32_t Clock_driver_ticks;
80
81/*
82 *  Clock_isrs is the number of clock ISRs until the next invocation of
83 *  the RTEMS clock tick routine.  The clock tick device driver
84 *  gets an interrupt once a millisecond and counts down until the
85 *  length of time between the user configured microseconds per tick
86 *  has passed.
87 */
88
89uint32_t Clock_isrs;              /* ISRs until next tick */
90
91/*
92 * These are set by clock driver during its init
93 */
94 
95rtems_device_major_number rtems_clock_major = ~0;
96rtems_device_minor_number rtems_clock_minor;
97
98/*
99 *  The previous ISR on this clock tick interrupt vector.
100 */
101
102rtems_isr_entry  Old_ticker;
103
104void Clock_exit( void );
105
106static uint32_t mips_timer_rate = 0;
107
108/*
109 *  Isr Handler
110 */
111
112rtems_isr Clock_isr(
113  rtems_vector_number vector
114)
115{
116/*
117 * bump the number of clock driver ticks since initialization
118 *
119 * determine if it is time to announce the passing of tick as configured
120 * to RTEMS through the rtems_clock_tick directive
121 *
122 * perform any timer dependent tasks
123 */
124
125  reset_wdt();    /* Reset hardware watchdog timer */
126
127  Clock_driver_ticks += 1;
128
129  rtems_clock_tick();
130}
131
132/* User callback shell (set from Clock_Control) */
133static void (*user_callback)(void);
134
135rtems_isr User_Clock_isr(
136  rtems_vector_number vector
137)
138{
139   if (user_callback)
140      user_callback();
141}
142
143/*
144 *  Install_clock
145 *
146 *  Install a clock tick handleR and reprograms the chip.  This
147 *  is used to initially establish the clock tick.
148 */
149
150void Install_clock(
151  rtems_isr_entry clock_isr
152)
153{
154  /*
155  *  Initialize the clock tick device driver variables
156  */
157
158  Clock_driver_ticks = 0;
159  Clock_isrs = rtems_configuration_get_milliseconds_per_tick();
160
161  mips_timer_rate = rtems_configuration_get_microseconds_per_tick() *
162           bsp_clicks_per_microsecond;
163
164  /*
165  *  Hardware specific initialize goes here
166  */
167 
168  /* Set up USC heartbeat timer to generate interrupts */
169  disable_hbi();      /* Disable heartbeat interrupt in USC */
170 
171              /* Install interrupt handler */
172  Old_ticker = (rtems_isr_entry) set_vector( USC_isr, CLOCK_VECTOR, 1 );
173 
174  init_hbt();        /* Initialize heartbeat timer */
175 
176  reset_wdt();      /* Reset watchdog timer */
177 
178  enable_wdi();      /* Enable watchdog interrupt in USC */
179 
180  enable_hbi();      /* Enable heartbeat interrupt in USC */
181 
182              /* Enable USC interrupt in MIPS processor */
183  mips_enable_in_interrupt_mask(CLOCK_VECTOR_MASK);
184 
185  /*
186  *  Schedule the clock cleanup routine to execute if the application exits.
187  */
188
189  atexit( Clock_exit );
190}
191
192/*
193 *  Clean up before the application exits
194 */
195
196void Clock_exit( void )
197{
198  /* mips: turn off the timer interrupts */
199  mips_disable_in_interrupt_mask(~CLOCK_VECTOR_MASK);
200}
201
202/*
203 *  Clock_initialize
204 *
205 *  Device driver entry point for clock tick driver initialization.
206 */
207
208rtems_device_driver Clock_initialize(
209  rtems_device_major_number major,
210  rtems_device_minor_number minor,
211  void *pargp
212)
213{
214  Install_clock( Clock_isr );
215 
216  /*
217   * make major/minor avail to others such as shared memory driver
218   */
219 
220  rtems_clock_major = major;
221  rtems_clock_minor = minor;
222 
223  return RTEMS_SUCCESSFUL;
224}
225
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