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1da177e4 LT |
1 | /* |
2 | ** atariints.h -- Atari Linux interrupt handling structs and prototypes | |
3 | ** | |
121e70b6 | 4 | ** Copyright 1994 by Bj\94rn 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 | ||
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 | ||
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 | ||
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 | ||
111 | static 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 | ||
121 | static 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 | ||
132 | static 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 | ||
153 | static 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 | ||
160 | static 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 | ||
172 | static 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 | ||
179 | static 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 | ||
187 | static 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 | ||
194 | static 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 | ||
201 | unsigned long atari_register_vme_int( void ); | |
202 | void atari_unregister_vme_int( unsigned long ); | |
203 | ||
204 | #endif /* linux/atariints.h */ |