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 losing 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