arch/sh/boards/superh/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
  15 #include <asm/system.h>
  16 #include <asm/io.h>
  17 #include <asm/microdev.h>
  18
  19 #define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */
  20
  21
  22 static const struct {
  23         unsigned char fpgaIrq;
  24         unsigned char mapped;
  25         const char *name;
  26 } fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
  27         { 0,                            0,      "unused"   },           /* IRQ #0       IRL=15  0x200  */
  28         { MICRODEV_FPGA_IRQ_KEYBOARD,   1,      "keyboard" },           /* IRQ #1       IRL=14  0x220  */
  29         { MICRODEV_FPGA_IRQ_SERIAL1,    1,      "Serial #1"},           /* IRQ #2       IRL=13  0x240  */
  30         { MICRODEV_FPGA_IRQ_ETHERNET,   1,      "Ethernet" },           /* IRQ #3       IRL=12  0x260  */
  31         { MICRODEV_FPGA_IRQ_SERIAL2,    0,      "Serial #2"},           /* IRQ #4       IRL=11  0x280  */
  32         { 0,                            0,      "unused"   },           /* IRQ #5       IRL=10  0x2a0  */
  33         { 0,                            0,      "unused"   },           /* IRQ #6       IRL=9   0x2c0  */
  34         { MICRODEV_FPGA_IRQ_USB_HC,     1,      "USB"      },           /* IRQ #7       IRL=8   0x2e0  */
  35         { MICRODEV_IRQ_PCI_INTA,        1,      "PCI INTA" },           /* IRQ #8       IRL=7   0x300  */
  36         { MICRODEV_IRQ_PCI_INTB,        1,      "PCI INTB" },           /* IRQ #9       IRL=6   0x320  */
  37         { MICRODEV_IRQ_PCI_INTC,        1,      "PCI INTC" },           /* IRQ #10      IRL=5   0x340  */
  38         { MICRODEV_IRQ_PCI_INTD,        1,      "PCI INTD" },           /* IRQ #11      IRL=4   0x360  */
  39         { MICRODEV_FPGA_IRQ_MOUSE,      1,      "mouse"    },           /* IRQ #12      IRL=3   0x380  */
  40         { MICRODEV_FPGA_IRQ_IDE2,       1,      "IDE #2"   },           /* IRQ #13      IRL=2   0x3a0  */
  41         { MICRODEV_FPGA_IRQ_IDE1,       1,      "IDE #1"   },           /* IRQ #14      IRL=1   0x3c0  */
  42         { 0,                            0,      "unused"   },           /* IRQ #15      IRL=0   0x3e0  */
  43 };
  44
  45 #if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
  46 #  error Inconsistancy in defining the IRQ# for Keyboard!
  47 #endif
  48
  49 #if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
  50 #  error Inconsistancy in defining the IRQ# for Ethernet!
  51 #endif
  52
  53 #if (MICRODEV_LINUX_IRQ_USB_HC != 7)
  54 #  error Inconsistancy in defining the IRQ# for USB!
  55 #endif
  56
  57 #if (MICRODEV_LINUX_IRQ_MOUSE != 12)
  58 #  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
  59 #endif
  60
  61 #if (MICRODEV_LINUX_IRQ_IDE2 != 13)
  62 #  error Inconsistancy in defining the IRQ# for secondary IDE!
  63 #endif
  64
  65 #if (MICRODEV_LINUX_IRQ_IDE1 != 14)
  66 #  error Inconsistancy in defining the IRQ# for primary IDE!
  67 #endif
  68
  69 static void enable_microdev_irq(unsigned int irq);
  70 static void disable_microdev_irq(unsigned int irq);
  71
  72         /* shutdown is same as "disable" */
  73 #define shutdown_microdev_irq disable_microdev_irq
  74
  75 static void mask_and_ack_microdev(unsigned int);
  76 static void end_microdev_irq(unsigned int irq);
  77
  78 static unsigned int startup_microdev_irq(unsigned int irq)
  79 {
  80         enable_microdev_irq(irq);
  81         return 0;               /* never anything pending */
  82 }
  83
  84 static struct hw_interrupt_type microdev_irq_type = {
  85         .typename = "MicroDev-IRQ",
  86         .startup = startup_microdev_irq,
  87         .shutdown = shutdown_microdev_irq,
  88         .enable = enable_microdev_irq,
  89         .disable = disable_microdev_irq,
  90         .ack = mask_and_ack_microdev,
  91         .end = end_microdev_irq
  92 };
  93
  94 static void disable_microdev_irq(unsigned int irq)
  95 {
  96         unsigned int flags;
  97         unsigned int fpgaIrq;
  98
  99         if (irq >= NUM_EXTERNAL_IRQS) return;
 100         if (!fpgaIrqTable[irq].mapped) return;
 101
 102         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 103
 104                 /* disable interrupts */
 105         local_irq_save(flags);
 106
 107                 /* disable interupts on the FPGA INTC register */
 108         ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
 109
 110                 /* restore interrupts */
 111         local_irq_restore(flags);
 112 }
 113
 114 static void enable_microdev_irq(unsigned int irq)
 115 {
 116         unsigned long priorityReg, priorities, pri;
 117         unsigned int flags;
 118         unsigned int fpgaIrq;
 119
 120
 121         if (irq >= NUM_EXTERNAL_IRQS) return;
 122         if (!fpgaIrqTable[irq].mapped) return;
 123
 124         pri = 15 - irq;
 125
 126         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 127         priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
 128
 129                 /* disable interrupts */
 130         local_irq_save(flags);
 131
 132                 /* set priority for the interrupt */
 133         priorities = ctrl_inl(priorityReg);
 134         priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
 135         priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
 136         ctrl_outl(priorities, priorityReg);
 137
 138                 /* enable interupts on the FPGA INTC register */
 139         ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
 140
 141                 /* restore interrupts */
 142         local_irq_restore(flags);
 143 }
 144
 145         /* This functions sets the desired irq handler to be a MicroDev type */
 146 static void __init make_microdev_irq(unsigned int irq)
 147 {
 148         disable_irq_nosync(irq);
 149         irq_desc[irq].chip = &microdev_irq_type;
 150         disable_microdev_irq(irq);
 151 }
 152
 153 static void mask_and_ack_microdev(unsigned int irq)
 154 {
 155         disable_microdev_irq(irq);
 156 }
 157
 158 static void end_microdev_irq(unsigned int irq)
 159 {
 160         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 161         {
 162                 enable_microdev_irq(irq);
 163         }
 164 }
 165
 166 extern void __init init_microdev_irq(void)
 167 {
 168         int i;
 169
 170                 /* disable interupts on the FPGA INTC register */
 171         ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG);
 172
 173         for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
 174         {
 175                 make_microdev_irq(i);
 176         }
 177 }
 178
 179 extern void microdev_print_fpga_intc_status(void)
 180 {
 181         volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
 182         volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
 183         volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
 184         volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
 185         volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
 186         volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
 187         volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
 188         volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
 189
 190         printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
 191         printk("FPGA_INTENB = 0x%08x\n", *intenb);
 192         printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
 193         printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
 194         printk("FPGA_INTREQ = 0x%08x\n", *intreq);
 195         printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
 196         printk("-------------------------------------------------------------------------------\n");
 197 }
 198
 199