source: rtems/c/src/lib/libcpu/arm/s3c2400/irq/irq.h @ 479ac2d8

4.104.114.84.95
Last change on this file since 479ac2d8 was 479ac2d8, checked in by Jay Monkman <jtm@…>, on Mar 11, 2005 at 7:26:45 AM

2005-03-11 Philippe Simons <loki_666@…>

  • Makefile.am, configure.ac: Added gp32 BSP.
  • s3c2400/.cvsignore, s3c2400/Makefile.am, s3c2400/clock/clockdrv.c, s3c2400/include/s3c2400.h, s3c2400/irq/bsp_irq_asm.S, s3c2400/irq/bsp_irq_init.c, s3c2400/irq/irq.c, s3c2400/irq/irq.h, s3c2400/timer/timer.c: New files.
  • Property mode set to 100644
File size: 5.9 KB
Line 
1/* irq.h
2 *
3 *  This include file describe the data structure and the functions implemented
4 *  by rtems to write interrupt handlers.
5 *
6 * Copyright (c) 2000 Canon Research Centre France SA.
7 * Emmanuel Raguet, mailto:raguet@crf.canon.fr
8 *
9 *  The license and distribution terms for this file may be
10 *  found in found in the file LICENSE in this distribution or at
11 *  http://www.rtems.com/license/LICENSE.
12 *
13 *  $Id$
14 */
15
16#ifndef _IRQ_H_
17#define _IRQ_H_
18
19#ifdef __cplusplus
20extern "C" {
21#endif
22
23/*
24 * Include some preprocessor value also used by assember code
25 */
26 
27#include <rtems.h>
28#include <s3c2400.h>
29
30extern void default_int_handler();
31/*-------------------------------------------------------------------------+
32| Constants
33+--------------------------------------------------------------------------*/
34
35  /* enum of the possible interrupt sources */
36typedef enum {
37    BSP_EINT0 = 0,
38    BSP_EINT1,
39    BSP_EINT2,
40    BSP_EINT3,
41    BSP_EINT4,
42    BSP_EINT5,
43    BSP_EINT6,
44    BSP_EINT7,
45    BSP_INT_TICK,
46    BSP_INT_WDT,
47    BSP_INT_TIMER0,
48    BSP_INT_TIMER1,
49    BSP_INT_TIMER2,
50    BSP_INT_TIMER3,
51    BSP_INT_TIMER4,
52    BSP_INT_UERR01,
53    _res0,
54    BSP_INT_DMA0,
55    BSP_INT_DMA1,
56    BSP_INT_DMA2,
57    BSP_INT_DMA3,
58    BSP_INT_MMC,
59    BSP_INT_SPI,
60    BSP_INT_URXD0,
61    BSP_INT_URXD1,
62    BSP_INT_USBD,
63    BSP_INT_USBH,
64    BSP_INT_IIC,
65    BSP_INT_UTXD0,
66    BSP_INT_UTXD1,
67    BSP_INT_RTC,
68    BSP_INT_ADC,
69 
70    BSP_MAX_INT
71} rtems_irq_symbolic_name;
72
73extern void *bsp_vector_table;
74#define VECTOR_TABLE &bsp_vector_table
75 
76/*
77 * Type definition for RTEMS managed interrupts
78 */
79typedef unsigned char  rtems_irq_level;
80typedef unsigned char  rtems_irq_trigger;
81
82struct  __rtems_irq_connect_data__;     /* forward declaratiuon */
83
84typedef void (*rtems_irq_hdl) (void);
85typedef void (*rtems_irq_enable) (const struct __rtems_irq_connect_data__*);
86typedef void (*rtems_irq_disable) (const struct __rtems_irq_connect_data__*);
87typedef int (*rtems_irq_is_enabled) (const struct __rtems_irq_connect_data__*);
88
89typedef struct __rtems_irq_connect_data__ {
90    /*
91     * IRQ line
92     */
93    rtems_irq_symbolic_name     name;
94
95    /*
96     * handler. See comment on handler properties below in function prototype.
97     */
98    rtems_irq_hdl                       hdl;
99
100    /*
101     * function for enabling interrupts at device level (ONLY!).
102     * The BSP code will automatically enable it at i8259s level.
103     * RATIONALE : anyway such code has to exist in current driver code.
104     * It is usually called immediately AFTER connecting the interrupt handler.
105     * RTEMS may well need such a function when restoring normal interrupt
106     * processing after a debug session.
107     *
108     */
109    rtems_irq_enable            on;     
110
111    /*
112     * function for disabling interrupts at device level (ONLY!).
113     * The code will disable it at i8259s level. RATIONALE : anyway
114     * such code has to exist for clean shutdown. It is usually called
115     * BEFORE disconnecting the interrupt. RTEMS may well need such
116     * a function when disabling normal interrupt processing for
117     * a debug session. May well be a NOP function.
118     */
119    rtems_irq_disable           off;
120
121    /*
122     * function enabling to know what interrupt may currently occur
123     * if someone manipulates the i8259s interrupt mask without care...
124     */
125    rtems_irq_is_enabled        isOn;
126
127    /*
128     * priority level at the vplus level
129     */
130    rtems_irq_level             irqLevel;
131
132    /*
133     * Trigger way : Rising or falling edge or High or low level
134     */
135    rtems_irq_trigger           irqTrigger;
136
137} rtems_irq_connect_data;
138
139/*-------------------------------------------------------------------------+
140| Function Prototypes.
141+--------------------------------------------------------------------------*/
142/*
143 * ------------------ RTEMS Single Irq Handler Mngt Routines ----------------
144 */
145
146/*
147 * function to initialize the interrupt for a specific BSP
148 */
149void BSP_rtems_irq_mngt_init();
150
151
152/*
153 * function to connect a particular irq handler. This hanlder will NOT be called
154 * directly as the result of the corresponding interrupt. Instead, a RTEMS
155 * irq prologue will be called that will :
156 *
157 *      1) save the C scratch registers,
158 *      2) switch to a interrupt stack if the interrupt is not nested,
159 *      3) store the current i8259s' interrupt masks
160 *      4) modify them to disable the current interrupt at 8259 level (and may
161 *      be others depending on software priorities)
162 *      5) aknowledge the i8259s',
163 *      6) demask the processor,
164 *      7) call the application handler
165 *
166 * As a result the hdl function provided
167 *
168 *      a) can perfectly be written is C,
169 *      b) may also well directly call the part of the RTEMS API that can be used
170 *      from interrupt level,
171 *      c) It only responsible for handling the jobs that need to be done at
172 *      the device level including (aknowledging/re-enabling the interrupt at device,
173 *      level, getting the data,...)
174 *
175 *      When returning from the function, the following will be performed by
176 *      the RTEMS irq epilogue :
177 *
178 *      1) masks the interrupts again,
179 *      2) restore the original i8259s' interrupt masks
180 *      3) switch back on the orinal stack if needed,
181 *      4) perform rescheduling when necessary,
182 *      5) restore the C scratch registers...
183 *      6) restore initial execution flow
184 *
185 */
186int BSP_install_rtems_irq_handler       (const rtems_irq_connect_data*);
187
188/*
189 * function to get the current RTEMS irq handler for ptr->name. It enables to
190 * define hanlder chain...
191 */
192int BSP_get_current_rtems_irq_handler   (rtems_irq_connect_data* ptr);
193
194/*
195 * function to get disconnect the RTEMS irq handler for ptr->name.
196 * This function checks that the value given is the current one for safety reason.
197 * The user can use the previous function to get it.
198 */
199int BSP_remove_rtems_irq_handler        (const rtems_irq_connect_data*);
200
201
202#ifdef __cplusplus
203}
204#endif
205
206#endif /* _IRQ_H_ */
207/* end of include file */
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