1 /*
2 ** atariints.h -- Atari Linux interrupt handling structs and prototypes
3 **
4 ** Copyright 1994 by Bj”rn 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 #define IRQ_SPURIOUS (0)
49
50 /* auto-vector interrupts */
51 #define IRQ_AUTO_1 (1)
52 #define IRQ_AUTO_2 (2)
53 #define IRQ_AUTO_3 (3)
54 #define IRQ_AUTO_4 (4)
55 #define IRQ_AUTO_5 (5)
56 #define IRQ_AUTO_6 (6)
57 #define IRQ_AUTO_7 (7)
58
59 /* ST-MFP interrupts */
60 #define IRQ_MFP_BUSY (8)
61 #define IRQ_MFP_DCD (9)
62 #define IRQ_MFP_CTS (10)
63 #define IRQ_MFP_GPU (11)
64 #define IRQ_MFP_TIMD (12)
65 #define IRQ_MFP_TIMC (13)
66 #define IRQ_MFP_ACIA (14)
67 #define IRQ_MFP_FDC (15)
68 #define IRQ_MFP_ACSI IRQ_MFP_FDC
69 #define IRQ_MFP_FSCSI IRQ_MFP_FDC
70 #define IRQ_MFP_IDE IRQ_MFP_FDC
71 #define IRQ_MFP_TIMB (16)
72 #define IRQ_MFP_SERERR (17)
73 #define IRQ_MFP_SEREMPT (18)
74 #define IRQ_MFP_RECERR (19)
75 #define IRQ_MFP_RECFULL (20)
76 #define IRQ_MFP_TIMA (21)
77 #define IRQ_MFP_RI (22)
78 #define IRQ_MFP_MMD (23)
79
80 /* TT-MFP interrupts */
81 #define IRQ_TT_MFP_IO0 (24)
82 #define IRQ_TT_MFP_IO1 (25)
83 #define IRQ_TT_MFP_SCC (26)
84 #define IRQ_TT_MFP_RI (27)
85 #define IRQ_TT_MFP_TIMD (28)
86 #define IRQ_TT_MFP_TIMC (29)
87 #define IRQ_TT_MFP_DRVRDY (30)
88 #define IRQ_TT_MFP_SCSIDMA (31)
89 #define IRQ_TT_MFP_TIMB (32)
90 #define IRQ_TT_MFP_SERERR (33)
91 #define IRQ_TT_MFP_SEREMPT (34)
92 #define IRQ_TT_MFP_RECERR (35)
93 #define IRQ_TT_MFP_RECFULL (36)
94 #define IRQ_TT_MFP_TIMA (37)
95 #define IRQ_TT_MFP_RTC (38)
96 #define IRQ_TT_MFP_SCSI (39)
97
98 /* SCC interrupts */
99 #define IRQ_SCCB_TX (40)
100 #define IRQ_SCCB_STAT (42)
101 #define IRQ_SCCB_RX (44)
102 #define IRQ_SCCB_SPCOND (46)
103 #define IRQ_SCCA_TX (48)
104 #define IRQ_SCCA_STAT (50)
105 #define IRQ_SCCA_RX (52)
106 #define IRQ_SCCA_SPCOND (54)
107
108
109 #define INT_CLK 24576 /* CLK while int_clk =2.456MHz and divide = 100 */
110 #define INT_TICKS 246 /* to make sched_time = 99.902... HZ */
111
112
113 #define MFP_ENABLE 0
114 #define MFP_PENDING 1
115 #define MFP_SERVICE 2
116 #define MFP_MASK 3
117
118 /* Utility functions for setting/clearing bits in the interrupt registers of
119 * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
120 * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
121
122 static inline int get_mfp_bit( unsigned irq, int type )
123
124 { unsigned char mask, *reg;
125
126 mask = 1 << (irq & 7);
127 reg = (unsigned char *)&mfp.int_en_a + type*4 +
128 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
129 return( *reg & mask );
130 }
131
132 static inline void set_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 __asm__ __volatile__ ( "orb %0,%1"
140 : : "di" (mask), "m" (*reg) : "memory" );
141 }
142
143 static inline void clear_mfp_bit( unsigned irq, int type )
144
145 { unsigned char mask, *reg;
146
147 mask = ~(1 << (irq & 7));
148 reg = (unsigned char *)&mfp.int_en_a + type*4 +
149 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
150 if (type == MFP_PENDING || type == MFP_SERVICE)
151 __asm__ __volatile__ ( "moveb %0,%1"
152 : : "di" (mask), "m" (*reg) : "memory" );
153 else
154 __asm__ __volatile__ ( "andb %0,%1"
155 : : "di" (mask), "m" (*reg) : "memory" );
156 }
157
158 /*
159 * {en,dis}able_irq have the usual semantics of temporary blocking the
160 * interrupt, but not loosing requests that happen between disabling and
161 * enabling. This is done with the MFP mask registers.
162 */
163
164 static inline void atari_enable_irq( unsigned irq )
165
166 {
167 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
168 set_mfp_bit( irq, MFP_MASK );
169 }
170
171 static inline void atari_disable_irq( unsigned irq )
172
173 {
174 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
175 clear_mfp_bit( irq, MFP_MASK );
176 }
177
178 /*
179 * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
180 * "stored"
181 */
182
183 extern inline void atari_turnon_irq( unsigned irq )
184
185 {
186 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
187 set_mfp_bit( irq, MFP_ENABLE );
188 }
189
190 extern inline void atari_turnoff_irq( unsigned irq )
191
192 {
193 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
194 clear_mfp_bit( irq, MFP_ENABLE );
195 clear_mfp_bit( irq, MFP_PENDING );
196 }
197
198 extern inline void atari_clear_pending_irq( unsigned irq )
199
200 {
201 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
202 clear_mfp_bit( irq, MFP_PENDING );
203 }
204
205 extern inline int atari_irq_pending( unsigned irq )
206
207 {
208 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
209 return( get_mfp_bit( irq, MFP_PENDING ) );
210 }
211
212 unsigned long atari_register_vme_int( void );
213 void atari_unregister_vme_int( unsigned long );
214
215 #endif /* linux/atariints.h */
216
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