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
get_mfp_bit(unsigned irq,int type)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 *)&st_mfp.int_en_a + type*4 +
117 ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
118 return( *reg & mask );
119 }
120
set_mfp_bit(unsigned irq,int type)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 *)&st_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
clear_mfp_bit(unsigned irq,int type)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 *)&st_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
atari_enable_irq(unsigned irq)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
atari_disable_irq(unsigned irq)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
atari_turnon_irq(unsigned irq)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
atari_turnoff_irq(unsigned irq)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
atari_clear_pending_irq(unsigned irq)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
atari_irq_pending(unsigned irq)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 */
205