release/src-rt-6.x.4708/linux/linux-2.6.36/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/system.h>
  16 #include <asm/io.h>
  17 #include <mach/microdev.h>
  18
  19 #define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */
  20
  21 static const struct {
  22         unsigned char fpgaIrq;
  23         unsigned char mapped;
  24         const char *name;
  25 } fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
  26         { 0,                            0,      "unused"   },           /* IRQ #0       IRL=15  0x200  */
  27         { MICRODEV_FPGA_IRQ_KEYBOARD,   1,      "keyboard" },           /* IRQ #1       IRL=14  0x220  */
  28         { MICRODEV_FPGA_IRQ_SERIAL1,    1,      "Serial #1"},           /* IRQ #2       IRL=13  0x240  */
  29         { MICRODEV_FPGA_IRQ_ETHERNET,   1,      "Ethernet" },           /* IRQ #3       IRL=12  0x260  */
  30         { MICRODEV_FPGA_IRQ_SERIAL2,    0,      "Serial #2"},           /* IRQ #4       IRL=11  0x280  */
  31         { 0,                            0,      "unused"   },           /* IRQ #5       IRL=10  0x2a0  */
  32         { 0,                            0,      "unused"   },           /* IRQ #6       IRL=9   0x2c0  */
  33         { MICRODEV_FPGA_IRQ_USB_HC,     1,      "USB"      },           /* IRQ #7       IRL=8   0x2e0  */
  34         { MICRODEV_IRQ_PCI_INTA,        1,      "PCI INTA" },           /* IRQ #8       IRL=7   0x300  */
  35         { MICRODEV_IRQ_PCI_INTB,        1,      "PCI INTB" },           /* IRQ #9       IRL=6   0x320  */
  36         { MICRODEV_IRQ_PCI_INTC,        1,      "PCI INTC" },           /* IRQ #10      IRL=5   0x340  */
  37         { MICRODEV_IRQ_PCI_INTD,        1,      "PCI INTD" },           /* IRQ #11      IRL=4   0x360  */
  38         { MICRODEV_FPGA_IRQ_MOUSE,      1,      "mouse"    },           /* IRQ #12      IRL=3   0x380  */
  39         { MICRODEV_FPGA_IRQ_IDE2,       1,      "IDE #2"   },           /* IRQ #13      IRL=2   0x3a0  */
  40         { MICRODEV_FPGA_IRQ_IDE1,       1,      "IDE #1"   },           /* IRQ #14      IRL=1   0x3c0  */
  41         { 0,                            0,      "unused"   },           /* IRQ #15      IRL=0   0x3e0  */
  42 };
  43
  44 #if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
  45 #  error Inconsistancy in defining the IRQ# for Keyboard!
  46 #endif
  47
  48 #if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
  49 #  error Inconsistancy in defining the IRQ# for Ethernet!
  50 #endif
  51
  52 #if (MICRODEV_LINUX_IRQ_USB_HC != 7)
  53 #  error Inconsistancy in defining the IRQ# for USB!
  54 #endif
  55
  56 #if (MICRODEV_LINUX_IRQ_MOUSE != 12)
  57 #  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
  58 #endif
  59
  60 #if (MICRODEV_LINUX_IRQ_IDE2 != 13)
  61 #  error Inconsistancy in defining the IRQ# for secondary IDE!
  62 #endif
  63
  64 #if MICRODEV_LINUX_IRQ_IDE04
  65 #  error Inconsistancy in defining the IRQ# for primary IDE!
  66 #endif
  67
  68 static void enable_microdev_irq(unsigned int irq);
  69 static void disable_microdev_irq(unsigned int irq);
  70 static void mask_and_ack_microdev(unsigned int);
  71
  72 static struct irq_chip microdev_irq_type = {
  73         .name = "MicroDev-IRQ",
  74         .unmask = enable_microdev_irq,
  75         .mask = disable_microdev_irq,
  76         .ack = mask_and_ack_microdev,
  77 };
  78
  79 static void disable_microdev_irq(unsigned int irq)
  80 {
  81         unsigned int fpgaIrq;
  82
  83         if (irq >= NUM_EXTERNAL_IRQS)
  84                 return;
  85         if (!fpgaIrqTable[irq].mapped)
  86                 return;
  87
  88         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
  89
  90         /* disable interrupts on the FPGA INTC register */
  91         __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
  92 }
  93
  94 static void enable_microdev_irq(unsigned int irq)
  95 {
  96         unsigned long priorityReg, priorities, pri;
  97         unsigned int fpgaIrq;
  98
  99         if (unlikely(irq >= NUM_EXTERNAL_IRQS))
 100                 return;
 101         if (unlikely(!fpgaIrqTable[irq].mapped))
 102                 return;
 103
 104         pri = 15 - irq;
 105
 106         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 107         priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
 108
 109         /* set priority for the interrupt */
 110         priorities = __raw_readl(priorityReg);
 111         priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
 112         priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
 113         __raw_writel(priorities, priorityReg);
 114
 115         /* enable interrupts on the FPGA INTC register */
 116         __raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
 117 }
 118
 119 /* This function sets the desired irq handler to be a MicroDev type */
 120 static void __init make_microdev_irq(unsigned int irq)
 121 {
 122         disable_irq_nosync(irq);
 123         set_irq_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
 124         disable_microdev_irq(irq);
 125 }
 126
 127 static void mask_and_ack_microdev(unsigned int irq)
 128 {
 129         disable_microdev_irq(irq);
 130 }
 131
 132 extern void __init init_microdev_irq(void)
 133 {
 134         int i;
 135
 136         /* disable interrupts on the FPGA INTC register */
 137         __raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);
 138
 139         for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
 140                 make_microdev_irq(i);
 141 }
 142
 143 extern void microdev_print_fpga_intc_status(void)
 144 {
 145         volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
 146         volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
 147         volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
 148         volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
 149         volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
 150         volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
 151         volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
 152         volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
 153
 154         printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
 155         printk("FPGA_INTENB = 0x%08x\n", *intenb);
 156         printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
 157         printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
 158         printk("FPGA_INTREQ = 0x%08x\n", *intreq);
 159         printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
 160         printk("-------------------------------------------------------------------------------\n");
 161 }