arch/sh/boards/renesas/hs7751rvoip/irq.c

   1 /*
   2  * linux/arch/sh/boards/renesas/hs7751rvoip/irq.c
   3  *
   4  * Copyright (C) 2000  Kazumoto Kojima
   5  *
   6  * Renesas Technology Sales HS7751RVoIP Support.
   7  *
   8  * Modified for HS7751RVoIP by
   9  * Atom Create Engineering Co., Ltd. 2002.
  10  * Lineo uSolutions, Inc. 2003.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <asm/io.h>
  16 #include <asm/irq.h>
  17 #include <asm/hs7751rvoip/hs7751rvoip.h>
  18
  19 static int mask_pos[] = {8, 9, 10, 11, 12, 13, 0, 1, 2, 3, 4, 5, 6, 7};
  20
  21 static void enable_hs7751rvoip_irq(unsigned int irq);
  22 static void disable_hs7751rvoip_irq(unsigned int irq);
  23
  24 /* shutdown is same as "disable" */
  25 #define shutdown_hs7751rvoip_irq disable_hs7751rvoip_irq
  26
  27 static void ack_hs7751rvoip_irq(unsigned int irq);
  28 static void end_hs7751rvoip_irq(unsigned int irq);
  29
  30 static unsigned int startup_hs7751rvoip_irq(unsigned int irq)
  31 {
  32         enable_hs7751rvoip_irq(irq);
  33         return 0; /* never anything pending */
  34 }
  35
  36 static void disable_hs7751rvoip_irq(unsigned int irq)
  37 {
  38         unsigned short val;
  39         unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);
  40
  41         /* Set the priority in IPR to 0 */
  42         val = ctrl_inw(IRLCNTR3);
  43         val &= mask;
  44         ctrl_outw(val, IRLCNTR3);
  45 }
  46
  47 static void enable_hs7751rvoip_irq(unsigned int irq)
  48 {
  49         unsigned short val;
  50         unsigned short value = (0x0001 << mask_pos[irq]);
  51
  52         /* Set priority in IPR back to original value */
  53         val = ctrl_inw(IRLCNTR3);
  54         val |= value;
  55         ctrl_outw(val, IRLCNTR3);
  56 }
  57
  58 static void ack_hs7751rvoip_irq(unsigned int irq)
  59 {
  60         disable_hs7751rvoip_irq(irq);
  61 }
  62
  63 static void end_hs7751rvoip_irq(unsigned int irq)
  64 {
  65         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  66                 enable_hs7751rvoip_irq(irq);
  67 }
  68
  69 static struct hw_interrupt_type hs7751rvoip_irq_type = {
  70         .typename =  "HS7751RVoIP IRQ",
  71         .startup = startup_hs7751rvoip_irq,
  72         .shutdown = shutdown_hs7751rvoip_irq,
  73         .enable = enable_hs7751rvoip_irq,
  74         .disable = disable_hs7751rvoip_irq,
  75         .ack = ack_hs7751rvoip_irq,
  76         .end = end_hs7751rvoip_irq,
  77 };
  78
  79 static void make_hs7751rvoip_irq(unsigned int irq)
  80 {
  81         disable_irq_nosync(irq);
  82         irq_desc[irq].chip = &hs7751rvoip_irq_type;
  83         disable_hs7751rvoip_irq(irq);
  84 }
  85
  86 /*
  87  * Initialize IRQ setting
  88  */
  89 void __init init_hs7751rvoip_IRQ(void)
  90 {
  91         int i;
  92
  93         /* IRL0=ON HOOK1
  94          * IRL1=OFF HOOK1
  95          * IRL2=ON HOOK2
  96          * IRL3=OFF HOOK2
  97          * IRL4=Ringing Detection
  98          * IRL5=CODEC
  99          * IRL6=Ethernet
 100          * IRL7=Ethernet Hub
 101          * IRL8=USB Communication
 102          * IRL9=USB Connection
 103          * IRL10=USB DMA
 104          * IRL11=CF Card
 105          * IRL12=PCMCIA
 106          * IRL13=PCI Slot
 107          */
 108         ctrl_outw(0x9876, IRLCNTR1);
 109         ctrl_outw(0xdcba, IRLCNTR2);
 110         ctrl_outw(0x0050, IRLCNTR4);
 111         ctrl_outw(0x4321, IRLCNTR5);
 112
 113         for (i=0; i<14; i++)
 114                 make_hs7751rvoip_irq(i);
 115 }