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 
get_mfp_bit(unsigned irq,int type)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 
set_mfp_bit(unsigned irq,int type)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 
clear_mfp_bit(unsigned irq,int type)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 
atari_enable_irq(unsigned irq)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 
atari_disable_irq(unsigned irq)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 
atari_turnon_irq(unsigned irq)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 
atari_turnoff_irq(unsigned irq)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 
atari_clear_pending_irq(unsigned irq)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 
atari_irq_pending(unsigned irq)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