arch/sh/boards/renesas/r7780rp/irq.c

   1 /*
   2  * linux/arch/sh/boards/renesas/r7780rp/irq.c
   3  *
   4  * Copyright (C) 2000  Kazumoto Kojima
   5  *
   6  * Renesas Solutions Highlander R7780RP-1 Support.
   7  *
   8  * Modified for R7780RP-1 by
   9  * Atom Create Engineering Co., Ltd. 2002.
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <asm/io.h>
  16 #include <asm/irq.h>
  17 #include <asm/r7780rp/r7780rp.h>
  18
  19 #ifdef CONFIG_SH_R7780MP
  20 static int mask_pos[] = {12, 11, 9, 14, 15, 8, 13, 6, 5, 4, 3, 2, 0, 0, 1, 0};
  21 #else
  22 static int mask_pos[] = {15, 14, 13, 12, 11, 10, 9, 8, 7, 5, 6, 4, 0, 1, 2, 0};
  23 #endif
  24
  25 static void enable_r7780rp_irq(unsigned int irq);
  26 static void disable_r7780rp_irq(unsigned int irq);
  27
  28 /* shutdown is same as "disable" */
  29 #define shutdown_r7780rp_irq disable_r7780rp_irq
  30
  31 static void ack_r7780rp_irq(unsigned int irq);
  32 static void end_r7780rp_irq(unsigned int irq);
  33
  34 static unsigned int startup_r7780rp_irq(unsigned int irq)
  35 {
  36         enable_r7780rp_irq(irq);
  37         return 0; /* never anything pending */
  38 }
  39
  40 static void disable_r7780rp_irq(unsigned int irq)
  41 {
  42         unsigned short val;
  43         unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);
  44
  45         /* Set the priority in IPR to 0 */
  46         val = ctrl_inw(IRLCNTR1);
  47         val &= mask;
  48         ctrl_outw(val, IRLCNTR1);
  49 }
  50
  51 static void enable_r7780rp_irq(unsigned int irq)
  52 {
  53         unsigned short val;
  54         unsigned short value = (0x0001 << mask_pos[irq]);
  55
  56         /* Set priority in IPR back to original value */
  57         val = ctrl_inw(IRLCNTR1);
  58         val |= value;
  59         ctrl_outw(val, IRLCNTR1);
  60 }
  61
  62 static void ack_r7780rp_irq(unsigned int irq)
  63 {
  64         disable_r7780rp_irq(irq);
  65 }
  66
  67 static void end_r7780rp_irq(unsigned int irq)
  68 {
  69         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  70                 enable_r7780rp_irq(irq);
  71 }
  72
  73 static struct hw_interrupt_type r7780rp_irq_type = {
  74         .typename = "R7780RP-IRQ",
  75         .startup = startup_r7780rp_irq,
  76         .shutdown = shutdown_r7780rp_irq,
  77         .enable = enable_r7780rp_irq,
  78         .disable = disable_r7780rp_irq,
  79         .ack = ack_r7780rp_irq,
  80         .end = end_r7780rp_irq,
  81 };
  82
  83 static void make_r7780rp_irq(unsigned int irq)
  84 {
  85         disable_irq_nosync(irq);
  86         irq_desc[irq].chip = &r7780rp_irq_type;
  87         disable_r7780rp_irq(irq);
  88 }
  89
  90 /*
  91  * Initialize IRQ setting
  92  */
  93 void __init init_r7780rp_IRQ(void)
  94 {
  95         int i;
  96
  97         /* IRL0=PCI Slot #A
  98          * IRL1=PCI Slot #B
  99          * IRL2=PCI Slot #C
 100          * IRL3=PCI Slot #D
 101          * IRL4=CF Card
 102          * IRL5=CF Card Insert
 103          * IRL6=M66596
 104          * IRL7=SD Card
 105          * IRL8=Touch Panel
 106          * IRL9=SCI
 107          * IRL10=Serial
 108          * IRL11=Extention #A
 109          * IRL11=Extention #B
 110          * IRL12=Debug LAN
 111          * IRL13=Push Switch
 112          * IRL14=ZiggBee IO
 113          */
 114
 115         for (i=0; i<15; i++)
 116                 make_r7780rp_irq(i);
 117 }