arch/mips/kernel/irq-msc01.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * Copyright (c) 2004 MIPS Inc
   5  * Author: chris@mips.com
   6  *
   7  * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
   8  */
   9 #include <linux/interrupt.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/kernel_stat.h>
  13 #include <asm/io.h>
  14 #include <asm/irq.h>
  15 #include <asm/msc01_ic.h>
  16 #include <asm/traps.h>
  17
  18 static unsigned long _icctrl_msc;
  19 #define MSC01_IC_REG_BASE       _icctrl_msc
  20
  21 #define MSCIC_WRITE(reg, data)  do { *(volatile u32 *)(reg) = data; } while (0)
  22 #define MSCIC_READ(reg, data)   do { data = *(volatile u32 *)(reg); } while (0)
  23
  24 static unsigned int irq_base;
  25
  26 /* mask off an interrupt */
  27 static inline void mask_msc_irq(struct irq_data *d)
  28 {
  29         unsigned int irq = d->irq;
  30
  31         if (irq < (irq_base + 32))
  32                 MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
  33         else
  34                 MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
  35 }
  36
  37 /* unmask an interrupt */
  38 static inline void unmask_msc_irq(struct irq_data *d)
  39 {
  40         unsigned int irq = d->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(struct irq_data *d)
  52 {
  53         mask_msc_irq(d);
  54         if (!cpu_has_veic)
  55                 MSCIC_WRITE(MSC01_IC_EOI, 0);
  56 }
  57
  58 /*
  59  * Masks and ACKs an IRQ
  60  */
  61 static void edge_mask_and_ack_msc_irq(struct irq_data *d)
  62 {
  63         unsigned int irq = d->irq;
  64
  65         mask_msc_irq(d);
  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 }
  75
  76 /*
  77  * Interrupt handler for interrupts coming from SOC-it.
  78  */
  79 void ll_msc_irq(void)
  80 {
  81         unsigned int irq;
  82
  83         /* read the interrupt vector register */
  84         MSCIC_READ(MSC01_IC_VEC, irq);
  85         if (irq < 64)
  86                 do_IRQ(irq + irq_base);
  87         else {
  88                 /* Ignore spurious interrupt */
  89         }
  90 }
  91
  92 static void msc_bind_eic_interrupt(int irq, int set)
  93 {
  94         MSCIC_WRITE(MSC01_IC_RAMW,
  95                     (irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
  96 }
  97
  98 static struct irq_chip msc_levelirq_type = {
  99         .name = "SOC-it-Level",
 100         .irq_ack = level_mask_and_ack_msc_irq,
 101         .irq_mask = mask_msc_irq,
 102         .irq_mask_ack = level_mask_and_ack_msc_irq,
 103         .irq_unmask = unmask_msc_irq,
 104         .irq_eoi = unmask_msc_irq,
 105 };
 106
 107 static struct irq_chip msc_edgeirq_type = {
 108         .name = "SOC-it-Edge",
 109         .irq_ack = edge_mask_and_ack_msc_irq,
 110         .irq_mask = mask_msc_irq,
 111         .irq_mask_ack = edge_mask_and_ack_msc_irq,
 112         .irq_unmask = unmask_msc_irq,
 113         .irq_eoi = unmask_msc_irq,
 114 };
 115
 116
 117 void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
 118 {
 119         _icctrl_msc = (unsigned long) ioremap(icubase, 0x40000);
 120
 121         /* Reset interrupt controller - initialises all registers to 0 */
 122         MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
 123
 124         board_bind_eic_interrupt = &msc_bind_eic_interrupt;
 125
 126         for (; nirq > 0; nirq--, imp++) {
 127                 int n = imp->im_irq;
 128
 129                 switch (imp->im_type) {
 130                 case MSC01_IRQ_EDGE:
 131                         irq_set_chip_and_handler_name(irqbase + n,
 132                                                       &msc_edgeirq_type,
 133                                                       handle_edge_irq,
 134                                                       "edge");
 135                         if (cpu_has_veic)
 136                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
 137                         else
 138                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
 139                         break;
 140                 case MSC01_IRQ_LEVEL:
 141                         irq_set_chip_and_handler_name(irqbase + n,
 142                                                       &msc_levelirq_type,
 143                                                       handle_level_irq,
 144                                                       "level");
 145                         if (cpu_has_veic)
 146                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
 147                         else
 148                                 MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
 149                 }
 150         }
 151
 152         irq_base = irqbase;
 153
 154         MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT);     /* Enable interrupt generation */
 155
 156 }