Staging: iio: industrialio-ring.c: fix up sparse warnings
[linux/fpc-iii.git] / arch / m68k / amiga / amiints.c
blobc5b5212cc3f91544f42b27f73323f9cf0a9bfc42
1 /*
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
6 * for more details.
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
14 * fast handlers)
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
19 * called again.
20 * The whole interrupt handling for CIAs is moved to cia.c
21 * /Roman Zippel
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
34 * drivers.
35 * /Jes
38 #include <linux/init.h>
39 #include <linux/interrupt.h>
40 #include <linux/errno.h>
42 #include <asm/irq.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 = {
56 .name = "amiga",
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)
65 * Parameters: None
67 * Returns: Nothing
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 if (request_irq(IRQ_AUTO_1, ami_int1, 0, "int1", NULL))
76 pr_err("Couldn't register int%d\n", 1);
77 if (request_irq(IRQ_AUTO_3, ami_int3, 0, "int3", NULL))
78 pr_err("Couldn't register int%d\n", 3);
79 if (request_irq(IRQ_AUTO_4, ami_int4, 0, "int4", NULL))
80 pr_err("Couldn't register int%d\n", 4);
81 if (request_irq(IRQ_AUTO_5, ami_int5, 0, "int5", NULL))
82 pr_err("Couldn't register int%d\n", 5);
84 m68k_setup_irq_controller(&amiga_irq_controller, IRQ_USER, AMI_STD_IRQS);
86 /* turn off PCMCIA interrupts */
87 if (AMIGAHW_PRESENT(PCMCIA))
88 gayle.inten = GAYLE_IRQ_IDE;
90 /* turn off all interrupts and enable the master interrupt bit */
91 amiga_custom.intena = 0x7fff;
92 amiga_custom.intreq = 0x7fff;
93 amiga_custom.intena = IF_SETCLR | IF_INTEN;
95 cia_init_IRQ(&ciaa_base);
96 cia_init_IRQ(&ciab_base);
100 * Enable/disable a particular machine specific interrupt source.
101 * Note that this may affect other interrupts in case of a shared interrupt.
102 * This function should only be called for a _very_ short time to change some
103 * internal data, that may not be changed by the interrupt at the same time.
106 static void amiga_enable_irq(unsigned int irq)
108 amiga_custom.intena = IF_SETCLR | (1 << (irq - IRQ_USER));
111 static void amiga_disable_irq(unsigned int irq)
113 amiga_custom.intena = 1 << (irq - IRQ_USER);
117 * The builtin Amiga hardware interrupt handlers.
120 static irqreturn_t ami_int1(int irq, void *dev_id)
122 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
124 /* if serial transmit buffer empty, interrupt */
125 if (ints & IF_TBE) {
126 amiga_custom.intreq = IF_TBE;
127 m68k_handle_int(IRQ_AMIGA_TBE);
130 /* if floppy disk transfer complete, interrupt */
131 if (ints & IF_DSKBLK) {
132 amiga_custom.intreq = IF_DSKBLK;
133 m68k_handle_int(IRQ_AMIGA_DSKBLK);
136 /* if software interrupt set, interrupt */
137 if (ints & IF_SOFT) {
138 amiga_custom.intreq = IF_SOFT;
139 m68k_handle_int(IRQ_AMIGA_SOFT);
141 return IRQ_HANDLED;
144 static irqreturn_t ami_int3(int irq, void *dev_id)
146 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
148 /* if a blitter interrupt */
149 if (ints & IF_BLIT) {
150 amiga_custom.intreq = IF_BLIT;
151 m68k_handle_int(IRQ_AMIGA_BLIT);
154 /* if a copper interrupt */
155 if (ints & IF_COPER) {
156 amiga_custom.intreq = IF_COPER;
157 m68k_handle_int(IRQ_AMIGA_COPPER);
160 /* if a vertical blank interrupt */
161 if (ints & IF_VERTB) {
162 amiga_custom.intreq = IF_VERTB;
163 m68k_handle_int(IRQ_AMIGA_VERTB);
165 return IRQ_HANDLED;
168 static irqreturn_t ami_int4(int irq, void *dev_id)
170 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
172 /* if audio 0 interrupt */
173 if (ints & IF_AUD0) {
174 amiga_custom.intreq = IF_AUD0;
175 m68k_handle_int(IRQ_AMIGA_AUD0);
178 /* if audio 1 interrupt */
179 if (ints & IF_AUD1) {
180 amiga_custom.intreq = IF_AUD1;
181 m68k_handle_int(IRQ_AMIGA_AUD1);
184 /* if audio 2 interrupt */
185 if (ints & IF_AUD2) {
186 amiga_custom.intreq = IF_AUD2;
187 m68k_handle_int(IRQ_AMIGA_AUD2);
190 /* if audio 3 interrupt */
191 if (ints & IF_AUD3) {
192 amiga_custom.intreq = IF_AUD3;
193 m68k_handle_int(IRQ_AMIGA_AUD3);
195 return IRQ_HANDLED;
198 static irqreturn_t ami_int5(int irq, void *dev_id)
200 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
202 /* if serial receive buffer full interrupt */
203 if (ints & IF_RBF) {
204 /* acknowledge of IF_RBF must be done by the serial interrupt */
205 m68k_handle_int(IRQ_AMIGA_RBF);
208 /* if a disk sync interrupt */
209 if (ints & IF_DSKSYN) {
210 amiga_custom.intreq = IF_DSKSYN;
211 m68k_handle_int(IRQ_AMIGA_DSKSYN);
213 return IRQ_HANDLED;