2 * linux/arch/m68k/amiga/amiints.c -- Amiga Linux interrupt handling code
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file COPYING in the main directory of this archive
8 * 11/07/96: rewritten interrupt handling, irq lists are exists now only for
9 * this sources where it makes sense (VERTB/PORTS/EXTER) and you must
10 * be careful that dev_id for this sources is unique since this the
11 * only possibility to distinguish between different handlers for
12 * free_irq. irq lists also have different irq flags:
13 * - IRQ_FLG_FAST: handler is inserted at top of list (after other
15 * - IRQ_FLG_SLOW: handler is inserted at bottom of list and before
16 * they're executed irq level is set to the previous
17 * one, but handlers don't need to be reentrant, if
18 * reentrance occurred, slow handlers will be just
20 * The whole interrupt handling for CIAs is moved to cia.c
23 * 07/08/99: rewamp of the interrupt handling - we now have two types of
24 * interrupts, normal and fast handlers, fast handlers being
25 * marked with IRQF_DISABLED and runs with all other interrupts
26 * disabled. Normal interrupts disable their own source but
27 * run with all other interrupt sources enabled.
28 * PORTS and EXTER interrupts are always shared even if the
29 * drivers do not explicitly mark this when calling
30 * request_irq which they really should do.
31 * This is similar to the way interrupts are handled on all
32 * other architectures and makes a ton of sense besides
33 * having the advantage of making it easier to share
38 #include <linux/init.h>
39 #include <linux/interrupt.h>
40 #include <linux/errno.h>
43 #include <asm/traps.h>
44 #include <asm/amigahw.h>
45 #include <asm/amigaints.h>
46 #include <asm/amipcmcia.h>
48 static void amiga_enable_irq(unsigned int irq);
49 static void amiga_disable_irq(unsigned int irq);
50 static irqreturn_t ami_int1(int irq, void *dev_id);
51 static irqreturn_t ami_int3(int irq, void *dev_id);
52 static irqreturn_t ami_int4(int irq, void *dev_id);
53 static irqreturn_t ami_int5(int irq, void *dev_id);
55 static struct irq_controller amiga_irq_controller = {
57 .lock = __SPIN_LOCK_UNLOCKED(amiga_irq_controller.lock),
58 .enable = amiga_enable_irq,
59 .disable = amiga_disable_irq,
63 * void amiga_init_IRQ(void)
69 * This function should be called during kernel startup to initialize
70 * the amiga IRQ handling routines.
73 void __init amiga_init_IRQ(void)
75 request_irq(IRQ_AUTO_1, ami_int1, 0, "int1", NULL);
76 request_irq(IRQ_AUTO_3, ami_int3, 0, "int3", NULL);
77 request_irq(IRQ_AUTO_4, ami_int4, 0, "int4", NULL);
78 request_irq(IRQ_AUTO_5, ami_int5, 0, "int5", NULL);
80 m68k_setup_irq_controller(&amiga_irq_controller, IRQ_USER, AMI_STD_IRQS);
82 /* turn off PCMCIA interrupts */
83 if (AMIGAHW_PRESENT(PCMCIA))
84 gayle.inten = GAYLE_IRQ_IDE;
86 /* turn off all interrupts and enable the master interrupt bit */
87 amiga_custom.intena = 0x7fff;
88 amiga_custom.intreq = 0x7fff;
89 amiga_custom.intena = IF_SETCLR | IF_INTEN;
91 cia_init_IRQ(&ciaa_base);
92 cia_init_IRQ(&ciab_base);
96 * Enable/disable a particular machine specific interrupt source.
97 * Note that this may affect other interrupts in case of a shared interrupt.
98 * This function should only be called for a _very_ short time to change some
99 * internal data, that may not be changed by the interrupt at the same time.
102 static void amiga_enable_irq(unsigned int irq)
104 amiga_custom.intena = IF_SETCLR | (1 << (irq - IRQ_USER));
107 static void amiga_disable_irq(unsigned int irq)
109 amiga_custom.intena = 1 << (irq - IRQ_USER);
113 * The builtin Amiga hardware interrupt handlers.
116 static irqreturn_t ami_int1(int irq, void *dev_id)
118 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
120 /* if serial transmit buffer empty, interrupt */
122 amiga_custom.intreq = IF_TBE;
123 m68k_handle_int(IRQ_AMIGA_TBE);
126 /* if floppy disk transfer complete, interrupt */
127 if (ints & IF_DSKBLK) {
128 amiga_custom.intreq = IF_DSKBLK;
129 m68k_handle_int(IRQ_AMIGA_DSKBLK);
132 /* if software interrupt set, interrupt */
133 if (ints & IF_SOFT) {
134 amiga_custom.intreq = IF_SOFT;
135 m68k_handle_int(IRQ_AMIGA_SOFT);
140 static irqreturn_t ami_int3(int irq, void *dev_id)
142 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
144 /* if a blitter interrupt */
145 if (ints & IF_BLIT) {
146 amiga_custom.intreq = IF_BLIT;
147 m68k_handle_int(IRQ_AMIGA_BLIT);
150 /* if a copper interrupt */
151 if (ints & IF_COPER) {
152 amiga_custom.intreq = IF_COPER;
153 m68k_handle_int(IRQ_AMIGA_COPPER);
156 /* if a vertical blank interrupt */
157 if (ints & IF_VERTB) {
158 amiga_custom.intreq = IF_VERTB;
159 m68k_handle_int(IRQ_AMIGA_VERTB);
164 static irqreturn_t ami_int4(int irq, void *dev_id)
166 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
168 /* if audio 0 interrupt */
169 if (ints & IF_AUD0) {
170 amiga_custom.intreq = IF_AUD0;
171 m68k_handle_int(IRQ_AMIGA_AUD0);
174 /* if audio 1 interrupt */
175 if (ints & IF_AUD1) {
176 amiga_custom.intreq = IF_AUD1;
177 m68k_handle_int(IRQ_AMIGA_AUD1);
180 /* if audio 2 interrupt */
181 if (ints & IF_AUD2) {
182 amiga_custom.intreq = IF_AUD2;
183 m68k_handle_int(IRQ_AMIGA_AUD2);
186 /* if audio 3 interrupt */
187 if (ints & IF_AUD3) {
188 amiga_custom.intreq = IF_AUD3;
189 m68k_handle_int(IRQ_AMIGA_AUD3);
194 static irqreturn_t ami_int5(int irq, void *dev_id)
196 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
198 /* if serial receive buffer full interrupt */
200 /* acknowledge of IF_RBF must be done by the serial interrupt */
201 m68k_handle_int(IRQ_AMIGA_RBF);
204 /* if a disk sync interrupt */
205 if (ints & IF_DSKSYN) {
206 amiga_custom.intreq = IF_DSKSYN;
207 m68k_handle_int(IRQ_AMIGA_DSKSYN);