arch/m68k/amiga/amiints.c

   1 /*
   2  * 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
   9 #include <linux/init.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/errno.h>
  12 #include <linux/irq.h>
  13
  14 #include <asm/irq.h>
  15 #include <asm/traps.h>
  16 #include <asm/amigahw.h>
  17 #include <asm/amigaints.h>
  18 #include <asm/amipcmcia.h>
  19
  20
  21 /*
  22  * Enable/disable a particular machine specific interrupt source.
  23  * Note that this may affect other interrupts in case of a shared interrupt.
  24  * This function should only be called for a _very_ short time to change some
  25  * internal data, that may not be changed by the interrupt at the same time.
  26  */
  27
  28 static void amiga_irq_enable(struct irq_data *data)
  29 {
  30         amiga_custom.intena = IF_SETCLR | (1 << (data->irq - IRQ_USER));
  31 }
  32
  33 static void amiga_irq_disable(struct irq_data *data)
  34 {
  35         amiga_custom.intena = 1 << (data->irq - IRQ_USER);
  36 }
  37
  38 static struct irq_chip amiga_irq_chip = {
  39         .name           = "amiga",
  40         .irq_enable     = amiga_irq_enable,
  41         .irq_disable    = amiga_irq_disable,
  42 };
  43
  44
  45 /*
  46  * The builtin Amiga hardware interrupt handlers.
  47  */
  48
  49 static void ami_int1(struct irq_desc *desc)
  50 {
  51         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
  52
  53         /* if serial transmit buffer empty, interrupt */
  54         if (ints & IF_TBE) {
  55                 amiga_custom.intreq = IF_TBE;
  56                 generic_handle_irq(IRQ_AMIGA_TBE);
  57         }
  58
  59         /* if floppy disk transfer complete, interrupt */
  60         if (ints & IF_DSKBLK) {
  61                 amiga_custom.intreq = IF_DSKBLK;
  62                 generic_handle_irq(IRQ_AMIGA_DSKBLK);
  63         }
  64
  65         /* if software interrupt set, interrupt */
  66         if (ints & IF_SOFT) {
  67                 amiga_custom.intreq = IF_SOFT;
  68                 generic_handle_irq(IRQ_AMIGA_SOFT);
  69         }
  70 }
  71
  72 static void ami_int3(struct irq_desc *desc)
  73 {
  74         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
  75
  76         /* if a blitter interrupt */
  77         if (ints & IF_BLIT) {
  78                 amiga_custom.intreq = IF_BLIT;
  79                 generic_handle_irq(IRQ_AMIGA_BLIT);
  80         }
  81
  82         /* if a copper interrupt */
  83         if (ints & IF_COPER) {
  84                 amiga_custom.intreq = IF_COPER;
  85                 generic_handle_irq(IRQ_AMIGA_COPPER);
  86         }
  87
  88         /* if a vertical blank interrupt */
  89         if (ints & IF_VERTB) {
  90                 amiga_custom.intreq = IF_VERTB;
  91                 generic_handle_irq(IRQ_AMIGA_VERTB);
  92         }
  93 }
  94
  95 static void ami_int4(struct irq_desc *desc)
  96 {
  97         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
  98
  99         /* if audio 0 interrupt */
 100         if (ints & IF_AUD0) {
 101                 amiga_custom.intreq = IF_AUD0;
 102                 generic_handle_irq(IRQ_AMIGA_AUD0);
 103         }
 104
 105         /* if audio 1 interrupt */
 106         if (ints & IF_AUD1) {
 107                 amiga_custom.intreq = IF_AUD1;
 108                 generic_handle_irq(IRQ_AMIGA_AUD1);
 109         }
 110
 111         /* if audio 2 interrupt */
 112         if (ints & IF_AUD2) {
 113                 amiga_custom.intreq = IF_AUD2;
 114                 generic_handle_irq(IRQ_AMIGA_AUD2);
 115         }
 116
 117         /* if audio 3 interrupt */
 118         if (ints & IF_AUD3) {
 119                 amiga_custom.intreq = IF_AUD3;
 120                 generic_handle_irq(IRQ_AMIGA_AUD3);
 121         }
 122 }
 123
 124 static void ami_int5(struct irq_desc *desc)
 125 {
 126         unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
 127
 128         /* if serial receive buffer full interrupt */
 129         if (ints & IF_RBF) {
 130                 /* acknowledge of IF_RBF must be done by the serial interrupt */
 131                 generic_handle_irq(IRQ_AMIGA_RBF);
 132         }
 133
 134         /* if a disk sync interrupt */
 135         if (ints & IF_DSKSYN) {
 136                 amiga_custom.intreq = IF_DSKSYN;
 137                 generic_handle_irq(IRQ_AMIGA_DSKSYN);
 138         }
 139 }
 140
 141
 142 /*
 143  * void amiga_init_IRQ(void)
 144  *
 145  * Parameters:  None
 146  *
 147  * Returns:     Nothing
 148  *
 149  * This function should be called during kernel startup to initialize
 150  * the amiga IRQ handling routines.
 151  */
 152
 153 void __init amiga_init_IRQ(void)
 154 {
 155         m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
 156                                   AMI_STD_IRQS);
 157
 158         irq_set_chained_handler(IRQ_AUTO_1, ami_int1);
 159         irq_set_chained_handler(IRQ_AUTO_3, ami_int3);
 160         irq_set_chained_handler(IRQ_AUTO_4, ami_int4);
 161         irq_set_chained_handler(IRQ_AUTO_5, ami_int5);
 162
 163         /* turn off PCMCIA interrupts */
 164         if (AMIGAHW_PRESENT(PCMCIA))
 165                 gayle.inten = GAYLE_IRQ_IDE;
 166
 167         /* turn off all interrupts and enable the master interrupt bit */
 168         amiga_custom.intena = 0x7fff;
 169         amiga_custom.intreq = 0x7fff;
 170         amiga_custom.intena = IF_SETCLR | IF_INTEN;
 171
 172         cia_init_IRQ(&ciaa_base);
 173         cia_init_IRQ(&ciab_base);
 174 }