irq.c

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/*
 * arch/sh/boards/superh/microdev/irq.c
 *
 * Copyright (C) 2003 Sean McGoogan ([email protected])
 *
 * SuperH SH4-202 MicroDev board support.
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 */

#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <mach/microdev.h>

#define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */

static const struct {
    unsigned char fpgaIrq;
    unsigned char mapped;
    const char *name;
} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
    { 0,                0,  "unused"   },       /* IRQ #0   IRL=15  0x200  */
    { MICRODEV_FPGA_IRQ_KEYBOARD,   1,  "keyboard" },       /* IRQ #1   IRL=14  0x220  */
    { MICRODEV_FPGA_IRQ_SERIAL1,    1,  "Serial #1"},       /* IRQ #2   IRL=13  0x240  */
    { MICRODEV_FPGA_IRQ_ETHERNET,   1,  "Ethernet" },       /* IRQ #3   IRL=12  0x260  */
    { MICRODEV_FPGA_IRQ_SERIAL2,    0,  "Serial #2"},       /* IRQ #4   IRL=11  0x280  */
    { 0,                0,  "unused"   },       /* IRQ #5   IRL=10  0x2a0  */
    { 0,                0,  "unused"   },       /* IRQ #6   IRL=9   0x2c0  */
    { MICRODEV_FPGA_IRQ_USB_HC, 1,  "USB"      },       /* IRQ #7   IRL=8   0x2e0  */
    { MICRODEV_IRQ_PCI_INTA,    1,  "PCI INTA" },       /* IRQ #8   IRL=7   0x300  */
    { MICRODEV_IRQ_PCI_INTB,    1,  "PCI INTB" },       /* IRQ #9   IRL=6   0x320  */
    { MICRODEV_IRQ_PCI_INTC,    1,  "PCI INTC" },       /* IRQ #10  IRL=5   0x340  */
    { MICRODEV_IRQ_PCI_INTD,    1,  "PCI INTD" },       /* IRQ #11  IRL=4   0x360  */
    { MICRODEV_FPGA_IRQ_MOUSE,  1,  "mouse"    },       /* IRQ #12  IRL=3   0x380  */
    { MICRODEV_FPGA_IRQ_IDE2,   1,  "IDE #2"   },       /* IRQ #13  IRL=2   0x3a0  */
    { MICRODEV_FPGA_IRQ_IDE1,   1,  "IDE #1"   },       /* IRQ #14  IRL=1   0x3c0  */
    { 0,                0,  "unused"   },       /* IRQ #15  IRL=0   0x3e0  */
};

#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
#  error Inconsistancy in defining the IRQ# for Keyboard!
#endif

#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
#  error Inconsistancy in defining the IRQ# for Ethernet!
#endif

#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
#  error Inconsistancy in defining the IRQ# for USB!
#endif

#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
#  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
#endif

#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
#  error Inconsistancy in defining the IRQ# for secondary IDE!
#endif

#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
#  error Inconsistancy in defining the IRQ# for primary IDE!
#endif

static void disable_microdev_irq(struct irq_data *data)
{
    unsigned int irq = data->irq;
    unsigned int fpgaIrq;

    if (irq >= NUM_EXTERNAL_IRQS)
        return;
    if (!fpgaIrqTable[irq].mapped)
        return;

    fpgaIrq = fpgaIrqTable[irq].fpgaIrq;

    /* disable interrupts on the FPGA INTC register */
    __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
}

static void enable_microdev_irq(struct irq_data *data)
{
    unsigned int irq = data->irq;
    unsigned long priorityReg, priorities, pri;
    unsigned int fpgaIrq;

    if (unlikely(irq >= NUM_EXTERNAL_IRQS))
        return;
    if (unlikely(!fpgaIrqTable[irq].mapped))
        return;

    pri = 15 - irq;

    fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
    priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);

    /* set priority for the interrupt */
    priorities = __raw_readl(priorityReg);
    priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
    priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
    __raw_writel(priorities, priorityReg);

    /* enable interrupts on the FPGA INTC register */
    __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
}

static struct irq_chip microdev_irq_type = {
    .name = "MicroDev-IRQ",
    .irq_unmask = enable_microdev_irq,
    .irq_mask = disable_microdev_irq,
};

/* This function sets the desired irq handler to be a MicroDev type */
static void __init make_microdev_irq(unsigned int irq)
{
    disable_irq_nosync(irq);
    irq_set_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
    disable_microdev_irq(irq_get_irq_data(irq));
}

extern void __init init_microdev_irq(void)
{
    int i;

    /* disable interrupts on the FPGA INTC register */
    __raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);

    for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
        make_microdev_irq(i);
}

extern void microdev_print_fpga_intc_status(void)
{
    volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
    volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
    volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
    volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
    volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
    volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
    volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
    volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;

    printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
    printk("FPGA_INTENB = 0x%08x\n", *intenb);
    printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
    printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
    printk("FPGA_INTREQ = 0x%08x\n", *intreq);
    printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
    printk("-------------------------------------------------------------------------------\n");
}