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diff --git a/include/asm-m68k/atariints.h b/include/asm-m68k/atariints.h
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1/*
2** atariints.h -- Atari Linux interrupt handling structs and prototypes
3**
4** Copyright 1994 by Björn Brauel
5**
6** 5/2/94 Roman Hodek:
7** TT interrupt definitions added.
8**
9** 12/02/96: (Roman)
10** Adapted to new int handling scheme (see ataints.c); revised numbering
11**
12** This file is subject to the terms and conditions of the GNU General Public
13** License. See the file COPYING in the main directory of this archive
14** for more details.
15**
16*/
17
18#ifndef _LINUX_ATARIINTS_H_
19#define _LINUX_ATARIINTS_H_
20
21#include <asm/irq.h>
22#include <asm/atarihw.h>
23
24/*
25** Atari Interrupt sources.
26**
27*/
28
29#define STMFP_SOURCE_BASE 8
30#define TTMFP_SOURCE_BASE 24
31#define SCC_SOURCE_BASE 40
32#define VME_SOURCE_BASE 56
33#define VME_MAX_SOURCES 16
34
35#define NUM_ATARI_SOURCES (VME_SOURCE_BASE+VME_MAX_SOURCES-STMFP_SOURCE_BASE)
36
37/* convert vector number to int source number */
38#define IRQ_VECTOR_TO_SOURCE(v) ((v) - ((v) < 0x20 ? 0x18 : (0x40-8)))
39
40/* convert irq_handler index to vector number */
41#define IRQ_SOURCE_TO_VECTOR(i) ((i) + ((i) < 8 ? 0x18 : (0x40-8)))
42
43/* interrupt service types */
44#define IRQ_TYPE_SLOW 0
45#define IRQ_TYPE_FAST 1
46#define IRQ_TYPE_PRIO 2
47
48/* ST-MFP interrupts */
49#define IRQ_MFP_BUSY (8)
50#define IRQ_MFP_DCD (9)
51#define IRQ_MFP_CTS (10)
52#define IRQ_MFP_GPU (11)
53#define IRQ_MFP_TIMD (12)
54#define IRQ_MFP_TIMC (13)
55#define IRQ_MFP_ACIA (14)
56#define IRQ_MFP_FDC (15)
57#define IRQ_MFP_ACSI IRQ_MFP_FDC
58#define IRQ_MFP_FSCSI IRQ_MFP_FDC
59#define IRQ_MFP_IDE IRQ_MFP_FDC
60#define IRQ_MFP_TIMB (16)
61#define IRQ_MFP_SERERR (17)
62#define IRQ_MFP_SEREMPT (18)
63#define IRQ_MFP_RECERR (19)
64#define IRQ_MFP_RECFULL (20)
65#define IRQ_MFP_TIMA (21)
66#define IRQ_MFP_RI (22)
67#define IRQ_MFP_MMD (23)
68
69/* TT-MFP interrupts */
70#define IRQ_TT_MFP_IO0 (24)
71#define IRQ_TT_MFP_IO1 (25)
72#define IRQ_TT_MFP_SCC (26)
73#define IRQ_TT_MFP_RI (27)
74#define IRQ_TT_MFP_TIMD (28)
75#define IRQ_TT_MFP_TIMC (29)
76#define IRQ_TT_MFP_DRVRDY (30)
77#define IRQ_TT_MFP_SCSIDMA (31)
78#define IRQ_TT_MFP_TIMB (32)
79#define IRQ_TT_MFP_SERERR (33)
80#define IRQ_TT_MFP_SEREMPT (34)
81#define IRQ_TT_MFP_RECERR (35)
82#define IRQ_TT_MFP_RECFULL (36)
83#define IRQ_TT_MFP_TIMA (37)
84#define IRQ_TT_MFP_RTC (38)
85#define IRQ_TT_MFP_SCSI (39)
86
87/* SCC interrupts */
88#define IRQ_SCCB_TX (40)
89#define IRQ_SCCB_STAT (42)
90#define IRQ_SCCB_RX (44)
91#define IRQ_SCCB_SPCOND (46)
92#define IRQ_SCCA_TX (48)
93#define IRQ_SCCA_STAT (50)
94#define IRQ_SCCA_RX (52)
95#define IRQ_SCCA_SPCOND (54)
96
97
98#define INT_CLK 24576 /* CLK while int_clk =2.456MHz and divide = 100 */
99#define INT_TICKS 246 /* to make sched_time = 99.902... HZ */
100
101
102#define MFP_ENABLE 0
103#define MFP_PENDING 1
104#define MFP_SERVICE 2
105#define MFP_MASK 3
106
107/* Utility functions for setting/clearing bits in the interrupt registers of
108 * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
109 * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
110
111static inline int get_mfp_bit( unsigned irq, int type )
112
113{ unsigned char mask, *reg;
114
115 mask = 1 << (irq & 7);
116 reg = (unsigned char *)&mfp.int_en_a + type*4 +
117 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
118 return( *reg & mask );
119}
120
121static inline void set_mfp_bit( unsigned irq, int type )
122
123{ unsigned char mask, *reg;
124
125 mask = 1 << (irq & 7);
126 reg = (unsigned char *)&mfp.int_en_a + type*4 +
127 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
128 __asm__ __volatile__ ( "orb %0,%1"
129 : : "di" (mask), "m" (*reg) : "memory" );
130}
131
132static inline void clear_mfp_bit( unsigned irq, int type )
133
134{ unsigned char mask, *reg;
135
136 mask = ~(1 << (irq & 7));
137 reg = (unsigned char *)&mfp.int_en_a + type*4 +
138 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
139 if (type == MFP_PENDING || type == MFP_SERVICE)
140 __asm__ __volatile__ ( "moveb %0,%1"
141 : : "di" (mask), "m" (*reg) : "memory" );
142 else
143 __asm__ __volatile__ ( "andb %0,%1"
144 : : "di" (mask), "m" (*reg) : "memory" );
145}
146
147/*
148 * {en,dis}able_irq have the usual semantics of temporary blocking the
149 * interrupt, but not loosing requests that happen between disabling and
150 * enabling. This is done with the MFP mask registers.
151 */
152
153static inline void atari_enable_irq( unsigned irq )
154
155{
156 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
157 set_mfp_bit( irq, MFP_MASK );
158}
159
160static inline void atari_disable_irq( unsigned irq )
161
162{
163 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
164 clear_mfp_bit( irq, MFP_MASK );
165}
166
167/*
168 * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
169 * "stored"
170 */
171
172static inline void atari_turnon_irq( unsigned irq )
173
174{
175 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
176 set_mfp_bit( irq, MFP_ENABLE );
177}
178
179static inline void atari_turnoff_irq( unsigned irq )
180
181{
182 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
183 clear_mfp_bit( irq, MFP_ENABLE );
184 clear_mfp_bit( irq, MFP_PENDING );
185}
186
187static inline void atari_clear_pending_irq( unsigned irq )
188
189{
190 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
191 clear_mfp_bit( irq, MFP_PENDING );
192}
193
194static inline int atari_irq_pending( unsigned irq )
195
196{
197 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
198 return( get_mfp_bit( irq, MFP_PENDING ) );
199}
200
201unsigned long atari_register_vme_int( void );
202void atari_unregister_vme_int( unsigned long );
203
204#endif /* linux/atariints.h */
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