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 */ |
---|
58 | mips_isr_entry set_vector( rtems_isr_entry, rtems_vector_number, int ); |
---|
59 | |
---|
60 | void Clock_exit( void ); |
---|
61 | rtems_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 | |
---|
77 | volatile 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 | |
---|
87 | rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ |
---|
88 | |
---|
89 | /* |
---|
90 | * These are set by clock driver during its init |
---|
91 | */ |
---|
92 | |
---|
93 | rtems_device_major_number rtems_clock_major = ~0; |
---|
94 | rtems_device_minor_number rtems_clock_minor; |
---|
95 | |
---|
96 | /* |
---|
97 | * The previous ISR on this clock tick interrupt vector. |
---|
98 | */ |
---|
99 | |
---|
100 | rtems_isr_entry Old_ticker; |
---|
101 | |
---|
102 | void Clock_exit( void ); |
---|
103 | |
---|
104 | static unsigned32 mips_timer_rate = 0; |
---|
105 | |
---|
106 | /* |
---|
107 | * Isr Handler |
---|
108 | */ |
---|
109 | |
---|
110 | rtems_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) */ |
---|
132 | static void (*user_callback)(void); |
---|
133 | |
---|
134 | rtems_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 | |
---|
152 | void 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 | Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 ); |
---|
164 | /* |
---|
165 | * Hardware specific initialize goes here |
---|
166 | */ |
---|
167 | |
---|
168 | mips_timer_rate = |
---|
169 | rtems_configuration_get_microseconds_per_tick() * CLOCKS_PER_MICROSECOND; |
---|
170 | mips_set_timer( mips_timer_rate ); |
---|
171 | mips_enable_in_interrupt_mask(CLOCK_VECTOR_MASK); |
---|
172 | |
---|
173 | /* |
---|
174 | * Schedule the clock cleanup routine to execute if the application exits. |
---|
175 | */ |
---|
176 | |
---|
177 | atexit( Clock_exit ); |
---|
178 | } |
---|
179 | |
---|
180 | /* |
---|
181 | * Clean up before the application exits |
---|
182 | */ |
---|
183 | |
---|
184 | void Clock_exit( void ) |
---|
185 | { |
---|
186 | /* mips: turn off the timer interrupts */ |
---|
187 | mips_disable_in_interrupt_mask(CLOCK_VECTOR_MASK); |
---|
188 | } |
---|
189 | |
---|
190 | /* |
---|
191 | * Clock_initialize |
---|
192 | * |
---|
193 | * Device driver entry point for clock tick driver initialization. |
---|
194 | */ |
---|
195 | |
---|
196 | rtems_device_driver Clock_initialize( |
---|
197 | rtems_device_major_number major, |
---|
198 | rtems_device_minor_number minor, |
---|
199 | void *pargp |
---|
200 | ) |
---|
201 | { |
---|
202 | Install_clock( Clock_isr ); |
---|
203 | |
---|
204 | /* |
---|
205 | * make major/minor avail to others such as shared memory driver |
---|
206 | */ |
---|
207 | |
---|
208 | rtems_clock_major = major; |
---|
209 | rtems_clock_minor = minor; |
---|
210 | |
---|
211 | return RTEMS_SUCCESSFUL; |
---|
212 | } |
---|
213 | |
---|
214 | rtems_device_driver Clock_control( |
---|
215 | rtems_device_major_number major, |
---|
216 | rtems_device_minor_number minor, |
---|
217 | void *pargp |
---|
218 | ) |
---|
219 | { |
---|
220 | rtems_unsigned32 isrlevel; |
---|
221 | rtems_libio_ioctl_args_t *args = pargp; |
---|
222 | |
---|
223 | if (args == 0) |
---|
224 | goto done; |
---|
225 | |
---|
226 | /* |
---|
227 | * This is hokey, but until we get a defined interface |
---|
228 | * to do this, it will just be this simple... |
---|
229 | */ |
---|
230 | |
---|
231 | if (args->command == rtems_build_name('I', 'S', 'R', ' ')) |
---|
232 | { |
---|
233 | Clock_isr(CLOCK_VECTOR); |
---|
234 | } |
---|
235 | else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) |
---|
236 | { |
---|
237 | rtems_interrupt_disable( isrlevel ); |
---|
238 | user_callback = (void (*)(void))args->buffer; |
---|
239 | (void) set_vector( User_Clock_isr, CLOCK_VECTOR, 1 ); |
---|
240 | rtems_interrupt_enable( isrlevel ); |
---|
241 | } |
---|
242 | |
---|
243 | done: |
---|
244 | return RTEMS_SUCCESSFUL; |
---|
245 | } |
---|