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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 <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 long flags;
  39         unsigned short val;
  40         unsigned short mask = 0xffff ^ (0x0001 << mask_pos[irq]);
  41
  42         /* Set the priority in IPR to 0 */
  43         local_irq_save(flags);
  44         val = ctrl_inw(IRLCNTR3);
  45         val &= mask;
  46         ctrl_outw(val, IRLCNTR3);
  47         local_irq_restore(flags);
  48 }
  49
  50 static void enable_hs7751rvoip_irq(unsigned int irq)
  51 {
  52         unsigned long flags;
  53         unsigned short val;
  54         unsigned short value = (0x0001 << mask_pos[irq]);
  55
  56         /* Set priority in IPR back to original value */
  57         local_irq_save(flags);
  58         val = ctrl_inw(IRLCNTR3);
  59         val |= value;
  60         ctrl_outw(val, IRLCNTR3);
  61         local_irq_restore(flags);
  62 }
  63
  64 static void ack_hs7751rvoip_irq(unsigned int irq)
  65 {
  66         disable_hs7751rvoip_irq(irq);
  67 }
  68
  69 static void end_hs7751rvoip_irq(unsigned int irq)
  70 {
  71         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  72                 enable_hs7751rvoip_irq(irq);
  73 }
  74
  75 static struct hw_interrupt_type hs7751rvoip_irq_type = {
  76         .typename =  "HS7751RVoIP IRQ",
  77         .startup = startup_hs7751rvoip_irq,
  78         .shutdown = shutdown_hs7751rvoip_irq,
  79         .enable = enable_hs7751rvoip_irq,
  80         .disable = disable_hs7751rvoip_irq,
  81         .ack = ack_hs7751rvoip_irq,
  82         .end = end_hs7751rvoip_irq,
  83 };
  84
  85 static void make_hs7751rvoip_irq(unsigned int irq)
  86 {
  87         disable_irq_nosync(irq);
  88         irq_desc[irq].chip = &hs7751rvoip_irq_type;
  89         disable_hs7751rvoip_irq(irq);
  90 }
  91
  92 /*
  93  * Initialize IRQ setting
  94  */
  95 void __init init_hs7751rvoip_IRQ(void)
  96 {
  97         int i;
  98
  99         /* IRL0=ON HOOK1
 100          * IRL1=OFF HOOK1
 101          * IRL2=ON HOOK2
 102          * IRL3=OFF HOOK2
 103          * IRL4=Ringing Detection
 104          * IRL5=CODEC
 105          * IRL6=Ethernet
 106          * IRL7=Ethernet Hub
 107          * IRL8=USB Communication
 108          * IRL9=USB Connection
 109          * IRL10=USB DMA
 110          * IRL11=CF Card
 111          * IRL12=PCMCIA
 112          * IRL13=PCI Slot
 113          */
 114         ctrl_outw(0x9876, IRLCNTR1);
 115         ctrl_outw(0xdcba, IRLCNTR2);
 116         ctrl_outw(0x0050, IRLCNTR4);
 117         ctrl_outw(0x4321, IRLCNTR5);
 118
 119         for (i=0; i<14; i++)
 120                 make_hs7751rvoip_irq(i);
 121 }