text: /*
   * 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 <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_IDE04
  #  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);
  static void mask_and_ack_microdev(unsigned int);
  
  static struct irq_chip microdev_irq_type = {
  	.name = "MicroDev-IRQ",
  	.unmask = enable_microdev_irq,
  	.mask = disable_microdev_irq,
  	.ack = mask_and_ack_microdev,
  };
  
  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 */
  	__raw_writel(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 = __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);
  }
  
  /* 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);
  	set_irq_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
  	disable_microdev_irq(irq);
  }
  
  static void mask_and_ack_microdev(unsigned int irq)
  {
  	disable_microdev_irq(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");
  }
  