LXR linux/arch/sh/boards/mach-microdev/irq.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * arch/sh/boards/superh/microdev/irq.c
   4 *
   5 * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
   6 *
   7 * SuperH SH4-202 MicroDev board support.
   8 */
   9
  10#include <linux/init.h>
  11#include <linux/irq.h>
  12#include <linux/interrupt.h>
  13#include <asm/io.h>
  14#include <mach/microdev.h>
  15
  16#define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */
  17
  18static const struct {
  19        unsigned char fpgaIrq;
  20        unsigned char mapped;
  21        const char *name;
  22} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
  23        { 0,                            0,      "unused"   },           /* IRQ #0       IRL=15  0x200  */
  24        { MICRODEV_FPGA_IRQ_KEYBOARD,   1,      "keyboard" },           /* IRQ #1       IRL=14  0x220  */
  25        { MICRODEV_FPGA_IRQ_SERIAL1,    1,      "Serial #1"},           /* IRQ #2       IRL=13  0x240  */
  26        { MICRODEV_FPGA_IRQ_ETHERNET,   1,      "Ethernet" },           /* IRQ #3       IRL=12  0x260  */
  27        { MICRODEV_FPGA_IRQ_SERIAL2,    0,      "Serial #2"},           /* IRQ #4       IRL=11  0x280  */
  28        { 0,                            0,      "unused"   },           /* IRQ #5       IRL=10  0x2a0  */
  29        { 0,                            0,      "unused"   },           /* IRQ #6       IRL=9   0x2c0  */
  30        { MICRODEV_FPGA_IRQ_USB_HC,     1,      "USB"      },           /* IRQ #7       IRL=8   0x2e0  */
  31        { MICRODEV_IRQ_PCI_INTA,        1,      "PCI INTA" },           /* IRQ #8       IRL=7   0x300  */
  32        { MICRODEV_IRQ_PCI_INTB,        1,      "PCI INTB" },           /* IRQ #9       IRL=6   0x320  */
  33        { MICRODEV_IRQ_PCI_INTC,        1,      "PCI INTC" },           /* IRQ #10      IRL=5   0x340  */
  34        { MICRODEV_IRQ_PCI_INTD,        1,      "PCI INTD" },           /* IRQ #11      IRL=4   0x360  */
  35        { MICRODEV_FPGA_IRQ_MOUSE,      1,      "mouse"    },           /* IRQ #12      IRL=3   0x380  */
  36        { MICRODEV_FPGA_IRQ_IDE2,       1,      "IDE #2"   },           /* IRQ #13      IRL=2   0x3a0  */
  37        { MICRODEV_FPGA_IRQ_IDE1,       1,      "IDE #1"   },           /* IRQ #14      IRL=1   0x3c0  */
  38        { 0,                            0,      "unused"   },           /* IRQ #15      IRL=0   0x3e0  */
  39};
  40
  41#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
  42#  error Inconsistancy in defining the IRQ# for Keyboard!
  43#endif
  44
  45#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
  46#  error Inconsistancy in defining the IRQ# for Ethernet!
  47#endif
  48
  49#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
  50#  error Inconsistancy in defining the IRQ# for USB!
  51#endif
  52
  53#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
  54#  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
  55#endif
  56
  57#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
  58#  error Inconsistancy in defining the IRQ# for secondary IDE!
  59#endif
  60
  61#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
  62#  error Inconsistancy in defining the IRQ# for primary IDE!
  63#endif
  64
  65static void disable_microdev_irq(struct irq_data *data)
  66{
  67        unsigned int irq = data->irq;
  68        unsigned int fpgaIrq;
  69
  70        if (irq >= NUM_EXTERNAL_IRQS)
  71                return;
  72        if (!fpgaIrqTable[irq].mapped)
  73                return;
  74
  75        fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
  76
  77        /* disable interrupts on the FPGA INTC register */
  78        __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
  79}
  80
  81static void enable_microdev_irq(struct irq_data *data)
  82{
  83        unsigned int irq = data->irq;
  84        unsigned long priorityReg, priorities, pri;
  85        unsigned int fpgaIrq;
  86
  87        if (unlikely(irq >= NUM_EXTERNAL_IRQS))
  88                return;
  89        if (unlikely(!fpgaIrqTable[irq].mapped))
  90                return;
  91
  92        pri = 15 - irq;
  93
  94        fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
  95        priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
  96
  97        /* set priority for the interrupt */
  98        priorities = __raw_readl(priorityReg);
  99        priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
 100        priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
 101        __raw_writel(priorities, priorityReg);
 102
 103        /* enable interrupts on the FPGA INTC register */
 104        __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
 105}
 106
 107static struct irq_chip microdev_irq_type = {
 108        .name = "MicroDev-IRQ",
 109        .irq_unmask = enable_microdev_irq,
 110        .irq_mask = disable_microdev_irq,
 111};
 112
 113/* This function sets the desired irq handler to be a MicroDev type */
 114static void __init make_microdev_irq(unsigned int irq)
 115{
 116        disable_irq_nosync(irq);
 117        irq_set_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
 118        disable_microdev_irq(irq_get_irq_data(irq));
 119}
 120
 121extern void __init init_microdev_irq(void)
 122{
 123        int i;
 124
 125        /* disable interrupts on the FPGA INTC register */
 126        __raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);
 127
 128        for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
 129                make_microdev_irq(i);
 130}
 131
 132extern void microdev_print_fpga_intc_status(void)
 133{
 134        volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
 135        volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
 136        volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
 137        volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
 138        volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
 139        volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
 140        volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
 141        volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
 142
 143        printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
 144        printk("FPGA_INTENB = 0x%08x\n", *intenb);
 145        printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
 146        printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
 147        printk("FPGA_INTREQ = 0x%08x\n", *intreq);
 148        printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
 149        printk("-------------------------------------------------------------------------------\n");
 150}
 151