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irq.c

/*
 * arch/sh/boards/superh/microdev/irq.c
 *
 * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
 *
 * 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/system.h>
#include <asm/io.h>
#include <asm/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 enable_microdev_irq(unsigned int irq);
static void disable_microdev_irq(unsigned int irq);

      /* shutdown is same as "disable" */
#define shutdown_microdev_irq disable_microdev_irq

static void mask_and_ack_microdev(unsigned int);
static void end_microdev_irq(unsigned int irq);

static unsigned int startup_microdev_irq(unsigned int irq)
{
      enable_microdev_irq(irq);
      return 0;         /* never anything pending */
}

static struct hw_interrupt_type microdev_irq_type = {
      .typename = "MicroDev-IRQ",
      .startup = startup_microdev_irq,
      .shutdown = shutdown_microdev_irq,
      .enable = enable_microdev_irq,
      .disable = disable_microdev_irq,
      .ack = mask_and_ack_microdev,
      .end = end_microdev_irq
};

static void disable_microdev_irq(unsigned int 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 */
      ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
}

static void enable_microdev_irq(unsigned int 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 = ctrl_inl(priorityReg);
      priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
      priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
      ctrl_outl(priorities, priorityReg);

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

      /* This functions sets the desired irq handler to be a MicroDev type */
static void __init make_microdev_irq(unsigned int irq)
{
      disable_irq_nosync(irq);
      irq_desc[irq].chip = &microdev_irq_type;
      disable_microdev_irq(irq);
}

static void mask_and_ack_microdev(unsigned int irq)
{
      disable_microdev_irq(irq);
}

static void end_microdev_irq(unsigned int irq)
{
      if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
            enable_microdev_irq(irq);
}

extern void __init init_microdev_irq(void)
{
      int i;

            /* disable interrupts on the FPGA INTC register */
      ctrl_outl(~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");
}



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