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1 | /* |
2 | ** atariints.h -- Atari Linux interrupt handling structs and prototypes | |
3 | ** | |
1039592d | 4 | ** Copyright 1994 by Björn Brauel |
1da177e4 LT |
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 | ||
736b24db | 35 | #define NUM_ATARI_SOURCES 141 |
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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 | ||
1da177e4 LT |
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 | ||
b1ae432c MS |
97 | /* shared MFP timer D interrupts - hires timer for EtherNEC et al. */ |
98 | #define IRQ_MFP_TIMER1 (64) | |
99 | #define IRQ_MFP_TIMER2 (65) | |
100 | #define IRQ_MFP_TIMER3 (66) | |
101 | #define IRQ_MFP_TIMER4 (67) | |
102 | #define IRQ_MFP_TIMER5 (68) | |
103 | #define IRQ_MFP_TIMER6 (69) | |
104 | #define IRQ_MFP_TIMER7 (70) | |
105 | #define IRQ_MFP_TIMER8 (71) | |
1da177e4 LT |
106 | |
107 | #define INT_CLK 24576 /* CLK while int_clk =2.456MHz and divide = 100 */ | |
108 | #define INT_TICKS 246 /* to make sched_time = 99.902... HZ */ | |
109 | ||
110 | ||
111 | #define MFP_ENABLE 0 | |
112 | #define MFP_PENDING 1 | |
113 | #define MFP_SERVICE 2 | |
114 | #define MFP_MASK 3 | |
115 | ||
116 | /* Utility functions for setting/clearing bits in the interrupt registers of | |
117 | * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is | |
118 | * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */ | |
119 | ||
120 | static inline int get_mfp_bit( unsigned irq, int type ) | |
121 | ||
122 | { unsigned char mask, *reg; | |
123 | ||
124 | mask = 1 << (irq & 7); | |
3d92e8f3 | 125 | reg = (unsigned char *)&st_mfp.int_en_a + type*4 + |
1da177e4 LT |
126 | ((irq & 8) >> 2) + (((irq-8) & 16) << 3); |
127 | return( *reg & mask ); | |
128 | } | |
129 | ||
130 | static inline void set_mfp_bit( unsigned irq, int type ) | |
131 | ||
132 | { unsigned char mask, *reg; | |
133 | ||
134 | mask = 1 << (irq & 7); | |
3d92e8f3 | 135 | reg = (unsigned char *)&st_mfp.int_en_a + type*4 + |
1da177e4 LT |
136 | ((irq & 8) >> 2) + (((irq-8) & 16) << 3); |
137 | __asm__ __volatile__ ( "orb %0,%1" | |
138 | : : "di" (mask), "m" (*reg) : "memory" ); | |
139 | } | |
140 | ||
141 | static inline void clear_mfp_bit( unsigned irq, int type ) | |
142 | ||
143 | { unsigned char mask, *reg; | |
144 | ||
145 | mask = ~(1 << (irq & 7)); | |
3d92e8f3 | 146 | reg = (unsigned char *)&st_mfp.int_en_a + type*4 + |
1da177e4 LT |
147 | ((irq & 8) >> 2) + (((irq-8) & 16) << 3); |
148 | if (type == MFP_PENDING || type == MFP_SERVICE) | |
149 | __asm__ __volatile__ ( "moveb %0,%1" | |
150 | : : "di" (mask), "m" (*reg) : "memory" ); | |
151 | else | |
152 | __asm__ __volatile__ ( "andb %0,%1" | |
153 | : : "di" (mask), "m" (*reg) : "memory" ); | |
154 | } | |
155 | ||
156 | /* | |
157 | * {en,dis}able_irq have the usual semantics of temporary blocking the | |
25985edc | 158 | * interrupt, but not losing requests that happen between disabling and |
1da177e4 LT |
159 | * enabling. This is done with the MFP mask registers. |
160 | */ | |
161 | ||
162 | static inline void atari_enable_irq( unsigned irq ) | |
163 | ||
164 | { | |
165 | if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; | |
166 | set_mfp_bit( irq, MFP_MASK ); | |
167 | } | |
168 | ||
169 | static inline void atari_disable_irq( unsigned irq ) | |
170 | ||
171 | { | |
172 | if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; | |
173 | clear_mfp_bit( irq, MFP_MASK ); | |
174 | } | |
175 | ||
176 | /* | |
177 | * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not | |
178 | * "stored" | |
179 | */ | |
180 | ||
181 | static inline void atari_turnon_irq( unsigned irq ) | |
182 | ||
183 | { | |
184 | if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; | |
185 | set_mfp_bit( irq, MFP_ENABLE ); | |
186 | } | |
187 | ||
188 | static inline void atari_turnoff_irq( unsigned irq ) | |
189 | ||
190 | { | |
191 | if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; | |
192 | clear_mfp_bit( irq, MFP_ENABLE ); | |
193 | clear_mfp_bit( irq, MFP_PENDING ); | |
194 | } | |
195 | ||
196 | static inline void atari_clear_pending_irq( unsigned irq ) | |
197 | ||
198 | { | |
199 | if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return; | |
200 | clear_mfp_bit( irq, MFP_PENDING ); | |
201 | } | |
202 | ||
203 | static inline int atari_irq_pending( unsigned irq ) | |
204 | ||
205 | { | |
206 | if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 ); | |
207 | return( get_mfp_bit( irq, MFP_PENDING ) ); | |
208 | } | |
209 | ||
44883eb0 GU |
210 | unsigned int atari_register_vme_int(void); |
211 | void atari_unregister_vme_int(unsigned int); | |
1da177e4 LT |
212 | |
213 | #endif /* linux/atariints.h */ |