arch/arm/mach-rpc/irq.c

   1 #include <linux/init.h>
   2 #include <linux/list.h>
   3
   4 #include <asm/mach/irq.h>
   5 #include <asm/hardware/iomd.h>
   6 #include <asm/irq.h>
   7 #include <asm/io.h>
   8
   9 static void iomd_ack_irq_a(unsigned int irq)
  10 {
  11         unsigned int val, mask;
  12
  13         mask = 1 << irq;
  14         val = iomd_readb(IOMD_IRQMASKA);
  15         iomd_writeb(val & ~mask, IOMD_IRQMASKA);
  16         iomd_writeb(mask, IOMD_IRQCLRA);
  17 }
  18
  19 static void iomd_mask_irq_a(unsigned int irq)
  20 {
  21         unsigned int val, mask;
  22
  23         mask = 1 << irq;
  24         val = iomd_readb(IOMD_IRQMASKA);
  25         iomd_writeb(val & ~mask, IOMD_IRQMASKA);
  26 }
  27
  28 static void iomd_unmask_irq_a(unsigned int irq)
  29 {
  30         unsigned int val, mask;
  31
  32         mask = 1 << irq;
  33         val = iomd_readb(IOMD_IRQMASKA);
  34         iomd_writeb(val | mask, IOMD_IRQMASKA);
  35 }
  36
  37 static struct irqchip iomd_a_chip = {
  38         .ack    = iomd_ack_irq_a,
  39         .mask   = iomd_mask_irq_a,
  40         .unmask = iomd_unmask_irq_a,
  41 };
  42
  43 static void iomd_mask_irq_b(unsigned int irq)
  44 {
  45         unsigned int val, mask;
  46
  47         mask = 1 << (irq & 7);
  48         val = iomd_readb(IOMD_IRQMASKB);
  49         iomd_writeb(val & ~mask, IOMD_IRQMASKB);
  50 }
  51
  52 static void iomd_unmask_irq_b(unsigned int irq)
  53 {
  54         unsigned int val, mask;
  55
  56         mask = 1 << (irq & 7);
  57         val = iomd_readb(IOMD_IRQMASKB);
  58         iomd_writeb(val | mask, IOMD_IRQMASKB);
  59 }
  60
  61 static struct irqchip iomd_b_chip = {
  62         .ack    = iomd_mask_irq_b,
  63         .mask   = iomd_mask_irq_b,
  64         .unmask = iomd_unmask_irq_b,
  65 };
  66
  67 static void iomd_mask_irq_dma(unsigned int irq)
  68 {
  69         unsigned int val, mask;
  70
  71         mask = 1 << (irq & 7);
  72         val = iomd_readb(IOMD_DMAMASK);
  73         iomd_writeb(val & ~mask, IOMD_DMAMASK);
  74 }
  75
  76 static void iomd_unmask_irq_dma(unsigned int irq)
  77 {
  78         unsigned int val, mask;
  79
  80         mask = 1 << (irq & 7);
  81         val = iomd_readb(IOMD_DMAMASK);
  82         iomd_writeb(val | mask, IOMD_DMAMASK);
  83 }
  84
  85 static struct irqchip iomd_dma_chip = {
  86         .ack    = iomd_mask_irq_dma,
  87         .mask   = iomd_mask_irq_dma,
  88         .unmask = iomd_unmask_irq_dma,
  89 };
  90
  91 static void iomd_mask_irq_fiq(unsigned int irq)
  92 {
  93         unsigned int val, mask;
  94
  95         mask = 1 << (irq & 7);
  96         val = iomd_readb(IOMD_FIQMASK);
  97         iomd_writeb(val & ~mask, IOMD_FIQMASK);
  98 }
  99
 100 static void iomd_unmask_irq_fiq(unsigned int irq)
 101 {
 102         unsigned int val, mask;
 103
 104         mask = 1 << (irq & 7);
 105         val = iomd_readb(IOMD_FIQMASK);
 106         iomd_writeb(val | mask, IOMD_FIQMASK);
 107 }
 108
 109 static struct irqchip iomd_fiq_chip = {
 110         .ack    = iomd_mask_irq_fiq,
 111         .mask   = iomd_mask_irq_fiq,
 112         .unmask = iomd_unmask_irq_fiq,
 113 };
 114
 115 void __init rpc_init_irq(void)
 116 {
 117         unsigned int irq, flags;
 118
 119         iomd_writeb(0, IOMD_IRQMASKA);
 120         iomd_writeb(0, IOMD_IRQMASKB);
 121         iomd_writeb(0, IOMD_FIQMASK);
 122         iomd_writeb(0, IOMD_DMAMASK);
 123
 124         for (irq = 0; irq < NR_IRQS; irq++) {
 125                 flags = IRQF_VALID;
 126
 127                 if (irq <= 6 || (irq >= 9 && irq <= 15))
 128                         flags |= IRQF_PROBE;
 129
 130                 if (irq == 21 || (irq >= 16 && irq <= 19) ||
 131                     irq == IRQ_KEYBOARDTX)
 132                         flags |= IRQF_NOAUTOEN;
 133
 134                 switch (irq) {
 135                 case 0 ... 7:
 136                         set_irq_chip(irq, &iomd_a_chip);
 137                         set_irq_handler(irq, do_level_IRQ);
 138                         set_irq_flags(irq, flags);
 139                         break;
 140
 141                 case 8 ... 15:
 142                         set_irq_chip(irq, &iomd_b_chip);
 143                         set_irq_handler(irq, do_level_IRQ);
 144                         set_irq_flags(irq, flags);
 145                         break;
 146
 147                 case 16 ... 21:
 148                         set_irq_chip(irq, &iomd_dma_chip);
 149                         set_irq_handler(irq, do_level_IRQ);
 150                         set_irq_flags(irq, flags);
 151                         break;
 152
 153                 case 64 ... 71:
 154                         set_irq_chip(irq, &iomd_fiq_chip);
 155                         set_irq_flags(irq, IRQF_VALID);
 156                         break;
 157                 }
 158         }
 159
 160         init_FIQ();
 161 }
 162