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/* 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/* shared MFP timer D interrupts - hires timer for EtherNEC et al. */
98#define IRQ_MFP_TIMER1       (64)
99#define IRQ_MFP_TIMER2       (65)
100#define IRQ_MFP_TIMER3       (66)
101#define IRQ_MFP_TIMER4       (67)
102#define IRQ_MFP_TIMER5       (68)
103#define IRQ_MFP_TIMER6       (69)
104#define IRQ_MFP_TIMER7       (70)
105#define IRQ_MFP_TIMER8       (71)
106
107#define INT_CLK   24576	    /* CLK while int_clk =2.456MHz and divide = 100 */
108#define INT_TICKS 246	    /* to make sched_time = 99.902... HZ */
109
110
111#define MFP_ENABLE	0
112#define MFP_PENDING	1
113#define MFP_SERVICE	2
114#define MFP_MASK	3
115
116/* Utility functions for setting/clearing bits in the interrupt registers of
117 * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
118 * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
119
120static inline int get_mfp_bit( unsigned irq, int type )
121
122{	unsigned char	mask, *reg;
123
124	mask = 1 << (irq & 7);
125	reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
126		  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
127	return( *reg & mask );
128}
129
130static inline void set_mfp_bit( unsigned irq, int type )
131
132{	unsigned char	mask, *reg;
133
134	mask = 1 << (irq & 7);
135	reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
136		  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
137	__asm__ __volatile__ ( "orb %0,%1"
138			      : : "di" (mask), "m" (*reg) : "memory" );
139}
140
141static inline void clear_mfp_bit( unsigned irq, int type )
142
143{	unsigned char	mask, *reg;
144
145	mask = ~(1 << (irq & 7));
146	reg = (unsigned char *)&st_mfp.int_en_a + type*4 +
147		  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
148	if (type == MFP_PENDING || type == MFP_SERVICE)
149		__asm__ __volatile__ ( "moveb %0,%1"
150				      : : "di" (mask), "m" (*reg) : "memory" );
151	else
152		__asm__ __volatile__ ( "andb %0,%1"
153				      : : "di" (mask), "m" (*reg) : "memory" );
154}
155
156/*
157 * {en,dis}able_irq have the usual semantics of temporary blocking the
158 * interrupt, but not losing requests that happen between disabling and
159 * enabling. This is done with the MFP mask registers.
160 */
161
162static inline void atari_enable_irq( unsigned irq )
163
164{
165	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
166	set_mfp_bit( irq, MFP_MASK );
167}
168
169static inline void atari_disable_irq( unsigned irq )
170
171{
172	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
173	clear_mfp_bit( irq, MFP_MASK );
174}
175
176/*
177 * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
178 * "stored"
179 */
180
181static inline void atari_turnon_irq( unsigned irq )
182
183{
184	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
185	set_mfp_bit( irq, MFP_ENABLE );
186}
187
188static inline void atari_turnoff_irq( unsigned irq )
189
190{
191	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
192	clear_mfp_bit( irq, MFP_ENABLE );
193	clear_mfp_bit( irq, MFP_PENDING );
194}
195
196static inline void atari_clear_pending_irq( unsigned irq )
197
198{
199	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
200	clear_mfp_bit( irq, MFP_PENDING );
201}
202
203static inline int atari_irq_pending( unsigned irq )
204
205{
206	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
207	return( get_mfp_bit( irq, MFP_PENDING ) );
208}
209
210unsigned int atari_register_vme_int(void);
211void atari_unregister_vme_int(unsigned int);
212
213#endif /* linux/atariints.h */
214