arch/mips/kernel/irq-msc01.c

   1 /*
   2  * This program is free software; you can redistribute  it and/or modify it
   3  * under  the terms of  the GNU General  Public License as published by the
   4  * Free Software Foundation;  either version 2 of the  License, or (at your
   5  * option) any later version.
   6  *
   7  * Copyright (c) 2004 MIPS Inc
   8  * Author: chris@mips.com
   9  *
  10  * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
  11  */
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/kernel_stat.h>
  17 #include <asm/io.h>
  18 #include <asm/irq.h>
  19 #include <asm/msc01_ic.h>
  20 #include <asm/traps.h>
  21
  22 static unsigned long _icctrl_msc;
  23 #define MSC01_IC_REG_BASE       _icctrl_msc
  24
  25 #define MSCIC_WRITE(reg, data)  do { *(volatile u32 *)(reg) = data; } while (0)
  26 #define MSCIC_READ(reg, data)   do { data = *(volatile u32 *)(reg); } while (0)
  27
  28 static unsigned int irq_base;
  29
  30 /* mask off an interrupt */
  31 static inline void mask_msc_irq(unsigned int irq)
  32 {
  33         if (irq < (irq_base + 32))
  34                 MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
  35         else
  36                 MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
  37 }
  38
  39 /* unmask an interrupt */
  40 static inline void unmask_msc_irq(unsigned int irq)
  41 {
  42         if (irq < (irq_base + 32))
  43                 MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
  44         else
  45                 MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
  46 }
  47
  48 /*
  49  * Masks and ACKs an IRQ
  50  */
  51 static void level_mask_and_ack_msc_irq(unsigned int irq)
  52 {
  53         mask_msc_irq(irq);
  54         if (!cpu_has_veic)
  55                 MSCIC_WRITE(MSC01_IC_EOI, 0);
  56         /* This actually needs to be a call into platform code */
  57         smtc_im_ack_irq(irq);
  58 }
  59
  60 /*
  61  * Masks and ACKs an IRQ
  62  */
  63 static void edge_mask_and_ack_msc_irq(unsigned int irq)
  64 {
  65         mask_msc_irq(irq);
  66         if (!cpu_has_veic)
  67                 MSCIC_WRITE(MSC01_IC_EOI, 0);
  68         else {
  69                 u32 r;
  70                 MSCIC_READ(MSC01_IC_SUP+irq*8, r);
  71                 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
  72                 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
  73         }
  74         smtc_im_ack_irq(irq);
  75 }
  76
  77 /*
  78  * End IRQ processing
  79  */
  80 static void end_msc_irq(unsigned int irq)
  81 {
  82         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  83                 unmask_msc_irq(irq);
  84 }
  85
  86 /*
  87  * Interrupt handler for interrupts coming from SOC-it.
  88  */
  89 void ll_msc_irq(void)
  90 {
  91         unsigned int irq;
  92
  93         /* read the interrupt vector register */
  94         MSCIC_READ(MSC01_IC_VEC, irq);
  95         if (irq < 64)
  96                 do_IRQ(irq + irq_base);
  97         else {
  98                 /* Ignore spurious interrupt */
  99         }
 100 }
 101
 102 static void msc_bind_eic_interrupt(int irq, int set)
 103 {
 104         MSCIC_WRITE(MSC01_IC_RAMW,
 105                     (irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
 106 }
 107
 108 static struct irq_chip msc_levelirq_type = {
 109         .name = "SOC-it-Level",
 110         .ack = level_mask_and_ack_msc_irq,
 111         .mask = mask_msc_irq,
 112         .mask_ack = level_mask_and_ack_msc_irq,
 113         .unmask = unmask_msc_irq,
 114         .eoi = unmask_msc_irq,
 115         .end = end_msc_irq,
 116 };
 117
 118 static struct irq_chip msc_edgeirq_type = {
 119         .name = "SOC-it-Edge",
 120         .ack = edge_mask_and_ack_msc_irq,
 121         .mask = mask_msc_irq,
 122         .mask_ack = edge_mask_and_ack_msc_irq,
 123         .unmask = unmask_msc_irq,
 124         .eoi = unmask_msc_irq,
 125         .end = end_msc_irq,
 126 };
 127
 128
 129 void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
 130 {
 131         _icctrl_msc = (unsigned long) ioremap(icubase, 0x40000);
 132
 133         /* Reset interrupt controller - initialises all registers to 0 */
 134         MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
 135
 136         board_bind_eic_interrupt = &msc_bind_eic_interrupt;
 137
 138         for (; nirq >= 0; nirq--, imp++) {
 139                 int n = imp->im_irq;
 140
 141                 switch (imp->im_type) {
 142                 case MSC01_IRQ_EDGE:
 143                         set_irq_chip(irqbase+n, &msc_edgeirq_type);
 144                         if (cpu_has_veic)
 145                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
 146                         else
 147                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
 148                         break;
 149                 case MSC01_IRQ_LEVEL:
 150                         set_irq_chip(irqbase+n, &msc_levelirq_type);
 151                         if (cpu_has_veic)
 152                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
 153                         else
 154                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
 155                 }
 156         }
 157
 158         irq_base = irqbase;
 159
 160         MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT);     /* Enable interrupt generation */
 161
 162 }