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 141
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 /* ST-MFP interrupts */
44 #define IRQ_MFP_BUSY (8)
45 #define IRQ_MFP_DCD (9)
46 #define IRQ_MFP_CTS (10)
47 #define IRQ_MFP_GPU (11)
48 #define IRQ_MFP_TIMD (12)
49 #define IRQ_MFP_TIMC (13)
50 #define IRQ_MFP_ACIA (14)
51 #define IRQ_MFP_FDC (15)
52 #define IRQ_MFP_ACSI IRQ_MFP_FDC
53 #define IRQ_MFP_FSCSI IRQ_MFP_FDC
54 #define IRQ_MFP_IDE IRQ_MFP_FDC
55 #define IRQ_MFP_TIMB (16)
56 #define IRQ_MFP_SERERR (17)
57 #define IRQ_MFP_SEREMPT (18)
58 #define IRQ_MFP_RECERR (19)
59 #define IRQ_MFP_RECFULL (20)
60 #define IRQ_MFP_TIMA (21)
61 #define IRQ_MFP_RI (22)
62 #define IRQ_MFP_MMD (23)
63
64 /* TT-MFP interrupts */
65 #define IRQ_TT_MFP_IO0 (24)
66 #define IRQ_TT_MFP_IO1 (25)
67 #define IRQ_TT_MFP_SCC (26)
68 #define IRQ_TT_MFP_RI (27)
69 #define IRQ_TT_MFP_TIMD (28)
70 #define IRQ_TT_MFP_TIMC (29)
71 #define IRQ_TT_MFP_DRVRDY (30)
72 #define IRQ_TT_MFP_SCSIDMA (31)
73 #define IRQ_TT_MFP_TIMB (32)
74 #define IRQ_TT_MFP_SERERR (33)
75 #define IRQ_TT_MFP_SEREMPT (34)
76 #define IRQ_TT_MFP_RECERR (35)
77 #define IRQ_TT_MFP_RECFULL (36)
78 #define IRQ_TT_MFP_TIMA (37)
79 #define IRQ_TT_MFP_RTC (38)
80 #define IRQ_TT_MFP_SCSI (39)
81
82 /* SCC interrupts */
83 #define IRQ_SCCB_TX (40)
84 #define IRQ_SCCB_STAT (42)
85 #define IRQ_SCCB_RX (44)
86 #define IRQ_SCCB_SPCOND (46)
87 #define IRQ_SCCA_TX (48)
88 #define IRQ_SCCA_STAT (50)
89 #define IRQ_SCCA_RX (52)
90 #define IRQ_SCCA_SPCOND (54)
91
92 /* shared MFP timer D interrupts - hires timer for EtherNEC et al. */
93 #define IRQ_MFP_TIMER1 (64)
94 #define IRQ_MFP_TIMER2 (65)
95 #define IRQ_MFP_TIMER3 (66)
96 #define IRQ_MFP_TIMER4 (67)
97 #define IRQ_MFP_TIMER5 (68)
98 #define IRQ_MFP_TIMER6 (69)
99 #define IRQ_MFP_TIMER7 (70)
100 #define IRQ_MFP_TIMER8 (71)
101
102 #define INT_CLK 24576 /* CLK while int_clk =2.456MHz and divide = 100 */
103 #define INT_TICKS 246 /* to make sched_time = 99.902... HZ */
104
105
106 #define MFP_ENABLE 0
107 #define MFP_PENDING 1
108 #define MFP_SERVICE 2
109 #define MFP_MASK 3
110
111 /* Utility functions for setting/clearing bits in the interrupt registers of
112 * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
113 * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
114
115 static inline int get_mfp_bit( unsigned irq, int type )
116
117 { unsigned char mask, *reg;
118
119 mask = 1 << (irq & 7);
120 reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
121 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
122 return( *reg & mask );
123 }
124
125 static inline void set_mfp_bit( unsigned irq, int type )
126
127 { unsigned char mask, *reg;
128
129 mask = 1 << (irq & 7);
130 reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
131 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
132 __asm__ __volatile__ ( "orb %0,%1"
133 : : "di" (mask), "m" (*reg) : "memory" );
134 }
135
136 static inline void clear_mfp_bit( unsigned irq, int type )
137
138 { unsigned char mask, *reg;
139
140 mask = ~(1 << (irq & 7));
141 reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
142 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
143 if (type == MFP_PENDING || type == MFP_SERVICE)
144 __asm__ __volatile__ ( "moveb %0,%1"
145 : : "di" (mask), "m" (*reg) : "memory" );
146 else
147 __asm__ __volatile__ ( "andb %0,%1"
148 : : "di" (mask), "m" (*reg) : "memory" );
149 }
150
151 /*
152 * {en,dis}able_irq have the usual semantics of temporary blocking the
153 * interrupt, but not losing requests that happen between disabling and
154 * enabling. This is done with the MFP mask registers.
155 */
156
157 static inline void atari_enable_irq( unsigned irq )
158
159 {
160 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
161 set_mfp_bit( irq, MFP_MASK );
162 }
163
164 static inline void atari_disable_irq( unsigned irq )
165
166 {
167 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
168 clear_mfp_bit( irq, MFP_MASK );
169 }
170
171 /*
172 * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
173 * "stored"
174 */
175
176 static inline void atari_turnon_irq( unsigned irq )
177
178 {
179 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
180 set_mfp_bit( irq, MFP_ENABLE );
181 }
182
183 static inline void atari_turnoff_irq( unsigned irq )
184
185 {
186 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
187 clear_mfp_bit( irq, MFP_ENABLE );
188 clear_mfp_bit( irq, MFP_PENDING );
189 }
190
191 static inline void atari_clear_pending_irq( unsigned irq )
192
193 {
194 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
195 clear_mfp_bit( irq, MFP_PENDING );
196 }
197
198 static inline int atari_irq_pending( unsigned irq )
199
200 {
201 if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
202 return( get_mfp_bit( irq, MFP_PENDING ) );
203 }
204
205 unsigned int atari_register_vme_int(void);
206 void atari_unregister_vme_int(unsigned int);
207
208 #endif /* linux/atariints.h */
209
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