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   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 <linux/interrupt.h>
  16 #include <asm/io.h>
  17 #include <asm/irq.h>
  18 #include <asm/hs7751rvoip.h>
  19
  20 static int mask_pos[] = {8, 9, 10, 11, 12, 13, 0, 1, 2, 3, 4, 5, 6, 7};
  21
  22 static void enable_hs7751rvoip_irq(unsigned int irq);
  23 static void disable_hs7751rvoip_irq(unsigned int irq);
  24
  25 /* shutdown is same as "disable" */
  26 #define shutdown_hs7751rvoip_irq disable_hs7751rvoip_irq
  27
  28 static void ack_hs7751rvoip_irq(unsigned int irq);
  29 static void end_hs7751rvoip_irq(unsigned int irq);
  30
  31 static unsigned int startup_hs7751rvoip_irq(unsigned int irq)
  32 {
  33         enable_hs7751rvoip_irq(irq);
  34         return 0; /* never anything pending */
  35 }
  36
  37 static void disable_hs7751rvoip_irq(unsigned int irq)
  38 {
  39         unsigned short val;
  40         unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);
  41
  42         /* Set the priority in IPR to 0 */
  43         val = ctrl_inw(IRLCNTR3);
  44         val &= mask;
  45         ctrl_outw(val, IRLCNTR3);
  46 }
  47
  48 static void enable_hs7751rvoip_irq(unsigned int irq)
  49 {
  50         unsigned short val;
  51         unsigned short value = (0x0001 << mask_pos[irq]);
  52
  53         /* Set priority in IPR back to original value */
  54         val = ctrl_inw(IRLCNTR3);
  55         val |= value;
  56         ctrl_outw(val, IRLCNTR3);
  57 }
  58
  59 static void ack_hs7751rvoip_irq(unsigned int irq)
  60 {
  61         disable_hs7751rvoip_irq(irq);
  62 }
  63
  64 static void end_hs7751rvoip_irq(unsigned int irq)
  65 {
  66         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  67                 enable_hs7751rvoip_irq(irq);
  68 }
  69
  70 static struct hw_interrupt_type hs7751rvoip_irq_type = {
  71         .typename =  "HS7751RVoIP IRQ",
  72         .startup = startup_hs7751rvoip_irq,
  73         .shutdown = shutdown_hs7751rvoip_irq,
  74         .enable = enable_hs7751rvoip_irq,
  75         .disable = disable_hs7751rvoip_irq,
  76         .ack = ack_hs7751rvoip_irq,
  77         .end = end_hs7751rvoip_irq,
  78 };
  79
  80 static void make_hs7751rvoip_irq(unsigned int irq)
  81 {
  82         disable_irq_nosync(irq);
  83         irq_desc[irq].chip = &hs7751rvoip_irq_type;
  84         disable_hs7751rvoip_irq(irq);
  85 }
  86
  87 /*
  88  * Initialize IRQ setting
  89  */
  90 void __init init_hs7751rvoip_IRQ(void)
  91 {
  92         int i;
  93
  94         /* IRL0=ON HOOK1
  95          * IRL1=OFF HOOK1
  96          * IRL2=ON HOOK2
  97          * IRL3=OFF HOOK2
  98          * IRL4=Ringing Detection
  99          * IRL5=CODEC
 100          * IRL6=Ethernet
 101          * IRL7=Ethernet Hub
 102          * IRL8=USB Communication
 103          * IRL9=USB Connection
 104          * IRL10=USB DMA
 105          * IRL11=CF Card
 106          * IRL12=PCMCIA
 107          * IRL13=PCI Slot
 108          */
 109         ctrl_outw(0x9876, IRLCNTR1);
 110         ctrl_outw(0xdcba, IRLCNTR2);
 111         ctrl_outw(0x0050, IRLCNTR4);
 112         ctrl_outw(0x4321, IRLCNTR5);
 113
 114         for (i=0; i<14; i++)
 115                 make_hs7751rvoip_irq(i);
 116 }