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
115static 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
125static 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
136static 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
157static 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
164static 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
176static 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
183static 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
191static 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
198static 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
205unsigned int atari_register_vme_int(void);
206void atari_unregister_vme_int(unsigned int);
207
208#endif /* linux/atariints.h */
209