1/*
2** atariints.h -- Atari Linux interrupt handling structs and prototypes
3**
4** Copyright 1994 by Bj�rn 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#define	IRQ_SPURIOUS      (0)
49
50/* auto-vector interrupts */
51#define IRQ_AUTO_1        (1)
52#define IRQ_AUTO_2        (2)
53#define IRQ_AUTO_3        (3)
54#define IRQ_AUTO_4        (4)
55#define IRQ_AUTO_5        (5)
56#define IRQ_AUTO_6        (6)
57#define IRQ_AUTO_7        (7)
58
59/* ST-MFP interrupts */
60#define IRQ_MFP_BUSY      (8)
61#define IRQ_MFP_DCD       (9)
62#define IRQ_MFP_CTS  	  (10)
63#define IRQ_MFP_GPU 	  (11)
64#define IRQ_MFP_TIMD      (12)
65#define IRQ_MFP_TIMC	  (13)
66#define IRQ_MFP_ACIA	  (14)
67#define IRQ_MFP_FDC       (15)
68#define IRQ_MFP_ACSI      IRQ_MFP_FDC
69#define IRQ_MFP_FSCSI     IRQ_MFP_FDC
70#define IRQ_MFP_IDE       IRQ_MFP_FDC
71#define IRQ_MFP_TIMB      (16)
72#define IRQ_MFP_SERERR    (17)
73#define IRQ_MFP_SEREMPT   (18)
74#define IRQ_MFP_RECERR    (19)
75#define IRQ_MFP_RECFULL   (20)
76#define IRQ_MFP_TIMA      (21)
77#define IRQ_MFP_RI        (22)
78#define IRQ_MFP_MMD       (23)
79
80/* TT-MFP interrupts */
81#define IRQ_TT_MFP_IO0       (24)
82#define IRQ_TT_MFP_IO1       (25)
83#define IRQ_TT_MFP_SCC	     (26)
84#define IRQ_TT_MFP_RI 	     (27)
85#define IRQ_TT_MFP_TIMD      (28)
86#define IRQ_TT_MFP_TIMC	     (29)
87#define IRQ_TT_MFP_DRVRDY    (30)
88#define IRQ_TT_MFP_SCSIDMA   (31)
89#define IRQ_TT_MFP_TIMB      (32)
90#define IRQ_TT_MFP_SERERR    (33)
91#define IRQ_TT_MFP_SEREMPT   (34)
92#define IRQ_TT_MFP_RECERR    (35)
93#define IRQ_TT_MFP_RECFULL   (36)
94#define IRQ_TT_MFP_TIMA      (37)
95#define IRQ_TT_MFP_RTC       (38)
96#define IRQ_TT_MFP_SCSI      (39)
97
98/* SCC interrupts */
99#define IRQ_SCCB_TX	     (40)
100#define IRQ_SCCB_STAT	     (42)
101#define IRQ_SCCB_RX	     (44)
102#define IRQ_SCCB_SPCOND	     (46)
103#define IRQ_SCCA_TX	     (48)
104#define IRQ_SCCA_STAT	     (50)
105#define IRQ_SCCA_RX	     (52)
106#define IRQ_SCCA_SPCOND	     (54)
107
108
109#define INT_CLK   24576	    /* CLK while int_clk =2.456MHz and divide = 100 */
110#define INT_TICKS 246	    /* to make sched_time = 99.902... HZ */
111
112
113#define MFP_ENABLE	0
114#define MFP_PENDING	1
115#define MFP_SERVICE	2
116#define MFP_MASK	3
117
118/* Utility functions for setting/clearing bits in the interrupt registers of
119 * the MFP. 'type' should be constant, if 'irq' is constant, too, code size is
120 * reduced. set_mfp_bit() is nonsense for PENDING and SERVICE registers. */
121
122static inline int get_mfp_bit( unsigned irq, int type )
123
124{	unsigned char	mask, *reg;
125
126	mask = 1 << (irq & 7);
127	reg = (unsigned char *)&mfp.int_en_a + type*4 +
128		  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
129	return( *reg & mask );
130}
131
132static inline void set_mfp_bit( unsigned irq, int type )
133
134{	unsigned char	mask, *reg;
135
136	mask = 1 << (irq & 7);
137	reg = (unsigned char *)&mfp.int_en_a + type*4 +
138		  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
139	__asm__ __volatile__ ( "orb %0,%1"
140			      : : "di" (mask), "m" (*reg) : "memory" );
141}
142
143static inline void clear_mfp_bit( unsigned irq, int type )
144
145{	unsigned char	mask, *reg;
146
147	mask = ~(1 << (irq & 7));
148	reg = (unsigned char *)&mfp.int_en_a + type*4 +
149		  ((irq & 8) >> 2) + (((irq-8) & 16) << 3);
150	if (type == MFP_PENDING || type == MFP_SERVICE)
151		__asm__ __volatile__ ( "moveb %0,%1"
152				      : : "di" (mask), "m" (*reg) : "memory" );
153	else
154		__asm__ __volatile__ ( "andb %0,%1"
155				      : : "di" (mask), "m" (*reg) : "memory" );
156}
157
158/*
159 * {en,dis}able_irq have the usual semantics of temporary blocking the
160 * interrupt, but not loosing requests that happen between disabling and
161 * enabling. This is done with the MFP mask registers.
162 */
163
164static inline void atari_enable_irq( unsigned irq )
165
166{
167	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
168	set_mfp_bit( irq, MFP_MASK );
169}
170
171static inline void atari_disable_irq( unsigned irq )
172
173{
174	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
175	clear_mfp_bit( irq, MFP_MASK );
176}
177
178/*
179 * In opposite to {en,dis}able_irq, requests between turn{off,on}_irq are not
180 * "stored"
181 */
182
183extern inline void atari_turnon_irq( unsigned irq )
184
185{
186	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
187	set_mfp_bit( irq, MFP_ENABLE );
188}
189
190extern inline void atari_turnoff_irq( unsigned irq )
191
192{
193	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
194	clear_mfp_bit( irq, MFP_ENABLE );
195	clear_mfp_bit( irq, MFP_PENDING );
196}
197
198extern inline void atari_clear_pending_irq( unsigned irq )
199
200{
201	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return;
202	clear_mfp_bit( irq, MFP_PENDING );
203}
204
205extern inline int atari_irq_pending( unsigned irq )
206
207{
208	if (irq < STMFP_SOURCE_BASE || irq >= SCC_SOURCE_BASE) return( 0 );
209	return( get_mfp_bit( irq, MFP_PENDING ) );
210}
211
212unsigned long atari_register_vme_int( void );
213void atari_unregister_vme_int( unsigned long );
214
215#endif /* linux/atariints.h */
216