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
  18 static 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
  65 static 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
  81 static 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
 107 static 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 */
 114 static 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
 121 extern 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
 132 extern 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 }