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

   1/*
   2 * arch/sh/boards/superh/microdev/irq.c
   3 *
   4 * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
   5 *
   6 * SuperH SH4-202 MicroDev board support.
   7 *
   8 * May be copied or modified under the terms of the GNU General Public
   9 * License.  See linux/COPYING for more information.
  10 */
  11
  12#include <linux/init.h>
  13#include <linux/irq.h>
  14#include <linux/interrupt.h>
  15#include <asm/io.h>
  16#include <mach/microdev.h>
  17
  18#define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */
  19
  20static const struct {
  21        unsigned char fpgaIrq;
  22        unsigned char mapped;
  23        const char *name;
  24} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
  25        { 0,                            0,      "unused"   },           /* IRQ #0       IRL=15  0x200  */
  26        { MICRODEV_FPGA_IRQ_KEYBOARD,   1,      "keyboard" },           /* IRQ #1       IRL=14  0x220  */
  27        { MICRODEV_FPGA_IRQ_SERIAL1,    1,      "Serial #1"},           /* IRQ #2       IRL=13  0x240  */
  28        { MICRODEV_FPGA_IRQ_ETHERNET,   1,      "Ethernet" },           /* IRQ #3       IRL=12  0x260  */
  29        { MICRODEV_FPGA_IRQ_SERIAL2,    0,      "Serial #2"},           /* IRQ #4       IRL=11  0x280  */
  30        { 0,                            0,      "unused"   },           /* IRQ #5       IRL=10  0x2a0  */
  31        { 0,                            0,      "unused"   },           /* IRQ #6       IRL=9   0x2c0  */
  32        { MICRODEV_FPGA_IRQ_USB_HC,     1,      "USB"      },           /* IRQ #7       IRL=8   0x2e0  */
  33        { MICRODEV_IRQ_PCI_INTA,        1,      "PCI INTA" },           /* IRQ #8       IRL=7   0x300  */
  34        { MICRODEV_IRQ_PCI_INTB,        1,      "PCI INTB" },           /* IRQ #9       IRL=6   0x320  */
  35        { MICRODEV_IRQ_PCI_INTC,        1,      "PCI INTC" },           /* IRQ #10      IRL=5   0x340  */
  36        { MICRODEV_IRQ_PCI_INTD,        1,      "PCI INTD" },           /* IRQ #11      IRL=4   0x360  */
  37        { MICRODEV_FPGA_IRQ_MOUSE,      1,      "mouse"    },           /* IRQ #12      IRL=3   0x380  */
  38        { MICRODEV_FPGA_IRQ_IDE2,       1,      "IDE #2"   },           /* IRQ #13      IRL=2   0x3a0  */
  39        { MICRODEV_FPGA_IRQ_IDE1,       1,      "IDE #1"   },           /* IRQ #14      IRL=1   0x3c0  */
  40        { 0,                            0,      "unused"   },           /* IRQ #15      IRL=0   0x3e0  */
  41};
  42
  43#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
  44#  error Inconsistancy in defining the IRQ# for Keyboard!
  45#endif
  46
  47#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
  48#  error Inconsistancy in defining the IRQ# for Ethernet!
  49#endif
  50
  51#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
  52#  error Inconsistancy in defining the IRQ# for USB!
  53#endif
  54
  55#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
  56#  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
  57#endif
  58
  59#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
  60#  error Inconsistancy in defining the IRQ# for secondary IDE!
  61#endif
  62
  63#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
  64#  error Inconsistancy in defining the IRQ# for primary IDE!
  65#endif
  66
  67static void disable_microdev_irq(struct irq_data *data)
  68{
  69        unsigned int irq = data->irq;
  70        unsigned int fpgaIrq;
  71
  72        if (irq >= NUM_EXTERNAL_IRQS)
  73                return;
  74        if (!fpgaIrqTable[irq].mapped)
  75                return;
  76
  77        fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
  78
  79        /* disable interrupts on the FPGA INTC register */
  80        __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
  81}
  82
  83static void enable_microdev_irq(struct irq_data *data)
  84{
  85        unsigned int irq = data->irq;
  86        unsigned long priorityReg, priorities, pri;
  87        unsigned int fpgaIrq;
  88
  89        if (unlikely(irq >= NUM_EXTERNAL_IRQS))
  90                return;
  91        if (unlikely(!fpgaIrqTable[irq].mapped))
  92                return;
  93
  94        pri = 15 - irq;
  95
  96        fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
  97        priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
  98
  99        /* set priority for the interrupt */
 100        priorities = __raw_readl(priorityReg);
 101        priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
 102        priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
 103        __raw_writel(priorities, priorityReg);
 104
 105        /* enable interrupts on the FPGA INTC register */
 106        __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
 107}
 108
 109static struct irq_chip microdev_irq_type = {
 110        .name = "MicroDev-IRQ",
 111        .irq_unmask = enable_microdev_irq,
 112        .irq_mask = disable_microdev_irq,
 113};
 114
 115/* This function sets the desired irq handler to be a MicroDev type */
 116static void __init make_microdev_irq(unsigned int irq)
 117{
 118        disable_irq_nosync(irq);
 119        irq_set_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
 120        disable_microdev_irq(irq_get_irq_data(irq));
 121}
 122
 123extern void __init init_microdev_irq(void)
 124{
 125        int i;
 126
 127        /* disable interrupts on the FPGA INTC register */
 128        __raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);
 129
 130        for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
 131                make_microdev_irq(i);
 132}
 133
 134extern void microdev_print_fpga_intc_status(void)
 135{
 136        volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
 137        volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
 138        volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
 139        volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
 140        volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
 141        volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
 142        volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
 143        volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
 144
 145        printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
 146        printk("FPGA_INTENB = 0x%08x\n", *intenb);
 147        printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
 148        printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
 149        printk("FPGA_INTREQ = 0x%08x\n", *intreq);
 150        printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
 151        printk("-------------------------------------------------------------------------------\n");
 152}
 153