arch/m68k/amiga/amiints.c

   1 /*
   2  * linux/arch/m68k/amiga/amiints.c -- Amiga Linux interrupt handling code
   3  *
   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.
   7  *
   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
  22  *
  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
  36  */
  37
  38 #include <linux/init.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/errno.h>
  41
  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>
  47
  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);
  54
  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,
  60 };
  61
  62 /*
  63  * void amiga_init_IRQ(void)
  64  *
  65  * Parameters:  None
  66  *
  67  * Returns:     Nothing
  68  *
  69  * This function should be called during kernel startup to initialize
  70  * the amiga IRQ handling routines.
  71  */
  72
  73 void __init amiga_init_IRQ(void)
  74 {
  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);
  79
  80         m68k_setup_irq_controller(&amiga_irq_controller, IRQ_USER, AMI_STD_IRQS);
  81
  82         /* turn off PCMCIA interrupts */
  83         if (AMIGAHW_PRESENT(PCMCIA))
  84                 gayle.inten = GAYLE_IRQ_IDE;
  85
  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;
  90
  91         cia_init_IRQ(&ciaa_base);
  92         cia_init_IRQ(&ciab_base);
  93 }
  94
  95 /*
  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.
 100  */
 101
 102 static void amiga_enable_irq(unsigned int irq)
 103 {
 104         amiga_custom.intena = IF_SETCLR | (1 << (irq - IRQ_USER));
 105 }
 106
 107 static void amiga_disable_irq(unsigned int irq)
 108 {
 109         amiga_custom.intena = 1 << (irq - IRQ_USER);
 110 }
 111
 112 /*
 113  * The builtin Amiga hardware interrupt handlers.
 114  */
 115
 116 static irqreturn_t ami_int1(int irq, void *dev_id)
 117 {
 118         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
 119
 120         /* if serial transmit buffer empty, interrupt */
 121         if (ints & IF_TBE) {
 122                 amiga_custom.intreq = IF_TBE;
 123                 m68k_handle_int(IRQ_AMIGA_TBE);
 124         }
 125
 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);
 130         }
 131
 132         /* if software interrupt set, interrupt */
 133         if (ints & IF_SOFT) {
 134                 amiga_custom.intreq = IF_SOFT;
 135                 m68k_handle_int(IRQ_AMIGA_SOFT);
 136         }
 137         return IRQ_HANDLED;
 138 }
 139
 140 static irqreturn_t ami_int3(int irq, void *dev_id)
 141 {
 142         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
 143
 144         /* if a blitter interrupt */
 145         if (ints & IF_BLIT) {
 146                 amiga_custom.intreq = IF_BLIT;
 147                 m68k_handle_int(IRQ_AMIGA_BLIT);
 148         }
 149
 150         /* if a copper interrupt */
 151         if (ints & IF_COPER) {
 152                 amiga_custom.intreq = IF_COPER;
 153                 m68k_handle_int(IRQ_AMIGA_COPPER);
 154         }
 155
 156         /* if a vertical blank interrupt */
 157         if (ints & IF_VERTB) {
 158                 amiga_custom.intreq = IF_VERTB;
 159                 m68k_handle_int(IRQ_AMIGA_VERTB);
 160         }
 161         return IRQ_HANDLED;
 162 }
 163
 164 static irqreturn_t ami_int4(int irq, void *dev_id)
 165 {
 166         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
 167
 168         /* if audio 0 interrupt */
 169         if (ints & IF_AUD0) {
 170                 amiga_custom.intreq = IF_AUD0;
 171                 m68k_handle_int(IRQ_AMIGA_AUD0);
 172         }
 173
 174         /* if audio 1 interrupt */
 175         if (ints & IF_AUD1) {
 176                 amiga_custom.intreq = IF_AUD1;
 177                 m68k_handle_int(IRQ_AMIGA_AUD1);
 178         }
 179
 180         /* if audio 2 interrupt */
 181         if (ints & IF_AUD2) {
 182                 amiga_custom.intreq = IF_AUD2;
 183                 m68k_handle_int(IRQ_AMIGA_AUD2);
 184         }
 185
 186         /* if audio 3 interrupt */
 187         if (ints & IF_AUD3) {
 188                 amiga_custom.intreq = IF_AUD3;
 189                 m68k_handle_int(IRQ_AMIGA_AUD3);
 190         }
 191         return IRQ_HANDLED;
 192 }
 193
 194 static irqreturn_t ami_int5(int irq, void *dev_id)
 195 {
 196         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
 197
 198         /* if serial receive buffer full interrupt */
 199         if (ints & IF_RBF) {
 200                 /* acknowledge of IF_RBF must be done by the serial interrupt */
 201                 m68k_handle_int(IRQ_AMIGA_RBF);
 202         }
 203
 204         /* if a disk sync interrupt */
 205         if (ints & IF_DSKSYN) {
 206                 amiga_custom.intreq = IF_DSKSYN;
 207                 m68k_handle_int(IRQ_AMIGA_DSKSYN);
 208         }
 209         return IRQ_HANDLED;
 210 }