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
  21 static unsigned long _icctrl_msc;
  22 #define MSC01_IC_REG_BASE       _icctrl_msc
  23
  24 #define MSCIC_WRITE(reg, data)  do { *(volatile u32 *)(reg) = data; } while (0)
  25 #define MSCIC_READ(reg, data)   do { data = *(volatile u32 *)(reg); } while (0)
  26
  27 static unsigned int irq_base;
  28
  29 /* mask off an interrupt */
  30 static inline void mask_msc_irq(unsigned int irq)
  31 {
  32         if (irq < (irq_base + 32))
  33                 MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
  34         else
  35                 MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
  36 }
  37
  38 /* unmask an interrupt */
  39 static inline void unmask_msc_irq(unsigned int irq)
  40 {
  41         if (irq < (irq_base + 32))
  42                 MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
  43         else
  44                 MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
  45 }
  46
  47 /*
  48  * Enables the IRQ on SOC-it
  49  */
  50 static void enable_msc_irq(unsigned int irq)
  51 {
  52         unmask_msc_irq(irq);
  53 }
  54
  55 /*
  56  * Initialize the IRQ on SOC-it
  57  */
  58 static unsigned int startup_msc_irq(unsigned int irq)
  59 {
  60         unmask_msc_irq(irq);
  61         return 0;
  62 }
  63
  64 /*
  65  * Disables the IRQ on SOC-it
  66  */
  67 static void disable_msc_irq(unsigned int irq)
  68 {
  69         mask_msc_irq(irq);
  70 }
  71
  72 /*
  73  * Masks and ACKs an IRQ
  74  */
  75 static void level_mask_and_ack_msc_irq(unsigned int irq)
  76 {
  77         mask_msc_irq(irq);
  78         if (!cpu_has_veic)
  79                 MSCIC_WRITE(MSC01_IC_EOI, 0);
  80 #ifdef CONFIG_MIPS_MT_SMTC
  81         /* This actually needs to be a call into platform code */
  82         if (irq_hwmask[irq] & ST0_IM)
  83                 set_c0_status(irq_hwmask[irq] & ST0_IM);
  84 #endif /* CONFIG_MIPS_MT_SMTC */
  85 }
  86
  87 /*
  88  * Masks and ACKs an IRQ
  89  */
  90 static void edge_mask_and_ack_msc_irq(unsigned int irq)
  91 {
  92         mask_msc_irq(irq);
  93         if (!cpu_has_veic)
  94                 MSCIC_WRITE(MSC01_IC_EOI, 0);
  95         else {
  96                 u32 r;
  97                 MSCIC_READ(MSC01_IC_SUP+irq*8, r);
  98                 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
  99                 MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
 100         }
 101 #ifdef CONFIG_MIPS_MT_SMTC
 102         if (irq_hwmask[irq] & ST0_IM)
 103                 set_c0_status(irq_hwmask[irq] & ST0_IM);
 104 #endif /* CONFIG_MIPS_MT_SMTC */
 105 }
 106
 107 /*
 108  * End IRQ processing
 109  */
 110 static void end_msc_irq(unsigned int irq)
 111 {
 112         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 113                 unmask_msc_irq(irq);
 114 }
 115
 116 /*
 117  * Interrupt handler for interrupts coming from SOC-it.
 118  */
 119 void ll_msc_irq(void)
 120 {
 121         unsigned int irq;
 122
 123         /* read the interrupt vector register */
 124         MSCIC_READ(MSC01_IC_VEC, irq);
 125         if (irq < 64)
 126                 do_IRQ(irq + irq_base);
 127         else {
 128                 /* Ignore spurious interrupt */
 129         }
 130 }
 131
 132 void
 133 msc_bind_eic_interrupt (unsigned int irq, unsigned int set)
 134 {
 135         MSCIC_WRITE(MSC01_IC_RAMW,
 136                     (irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
 137 }
 138
 139 #define shutdown_msc_irq        disable_msc_irq
 140
 141 struct irq_chip msc_levelirq_type = {
 142         .typename = "SOC-it-Level",
 143         .startup = startup_msc_irq,
 144         .shutdown = shutdown_msc_irq,
 145         .enable = enable_msc_irq,
 146         .disable = disable_msc_irq,
 147         .ack = level_mask_and_ack_msc_irq,
 148         .end = end_msc_irq,
 149 };
 150
 151 struct irq_chip msc_edgeirq_type = {
 152         .typename = "SOC-it-Edge",
 153         .startup =startup_msc_irq,
 154         .shutdown = shutdown_msc_irq,
 155         .enable = enable_msc_irq,
 156         .disable = disable_msc_irq,
 157         .ack = edge_mask_and_ack_msc_irq,
 158         .end = end_msc_irq,
 159 };
 160
 161
 162 void __init init_msc_irqs(unsigned int base, msc_irqmap_t *imp, int nirq)
 163 {
 164         extern void (*board_bind_eic_interrupt)(unsigned int irq, unsigned int regset);
 165
 166         _icctrl_msc = (unsigned long) ioremap (MIPS_MSC01_IC_REG_BASE, 0x40000);
 167
 168         /* Reset interrupt controller - initialises all registers to 0 */
 169         MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
 170
 171         board_bind_eic_interrupt = &msc_bind_eic_interrupt;
 172
 173         for (; nirq >= 0; nirq--, imp++) {
 174                 int n = imp->im_irq;
 175
 176                 switch (imp->im_type) {
 177                 case MSC01_IRQ_EDGE:
 178                         irq_desc[base+n].chip = &msc_edgeirq_type;
 179                         if (cpu_has_veic)
 180                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
 181                         else
 182                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
 183                         break;
 184                 case MSC01_IRQ_LEVEL:
 185                         irq_desc[base+n].chip = &msc_levelirq_type;
 186                         if (cpu_has_veic)
 187                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
 188                         else
 189                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
 190                 }
 191         }
 192
 193         irq_base = base;
 194
 195         MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT);     /* Enable interrupt generation */
 196
 197 }