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   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/config.h>
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15
  16 #include <asm/system.h>
  17 #include <asm/io.h>
  18 #include <asm/mach/irq.h>
  19
  20 #define NUM_EXTERNAL_IRQS 16    /* IRL0 .. IRL15 */
  21
  22
  23 static const struct {
  24         unsigned char fpgaIrq;
  25         unsigned char mapped;
  26         const char *name;
  27 } fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
  28         { 0,                            0,      "unused"   },           /* IRQ #0       IRL=15  0x200  */
  29         { MICRODEV_FPGA_IRQ_KEYBOARD,   1,      "keyboard" },           /* IRQ #1       IRL=14  0x220  */
  30         { MICRODEV_FPGA_IRQ_SERIAL1,    1,      "Serial #1"},           /* IRQ #2       IRL=13  0x240  */
  31         { MICRODEV_FPGA_IRQ_ETHERNET,   1,      "Ethernet" },           /* IRQ #3       IRL=12  0x260  */
  32         { MICRODEV_FPGA_IRQ_SERIAL2,    0,      "Serial #2"},           /* IRQ #4       IRL=11  0x280  */
  33         { 0,                            0,      "unused"   },           /* IRQ #5       IRL=10  0x2a0  */
  34         { 0,                            0,      "unused"   },           /* IRQ #6       IRL=9   0x2c0  */
  35         { MICRODEV_FPGA_IRQ_USB_HC,     1,      "USB"      },           /* IRQ #7       IRL=8   0x2e0  */
  36         { MICRODEV_IRQ_PCI_INTA,        1,      "PCI INTA" },           /* IRQ #8       IRL=7   0x300  */
  37         { MICRODEV_IRQ_PCI_INTB,        1,      "PCI INTB" },           /* IRQ #9       IRL=6   0x320  */
  38         { MICRODEV_IRQ_PCI_INTC,        1,      "PCI INTC" },           /* IRQ #10      IRL=5   0x340  */
  39         { MICRODEV_IRQ_PCI_INTD,        1,      "PCI INTD" },           /* IRQ #11      IRL=4   0x360  */
  40         { MICRODEV_FPGA_IRQ_MOUSE,      1,      "mouse"    },           /* IRQ #12      IRL=3   0x380  */
  41         { MICRODEV_FPGA_IRQ_IDE2,       1,      "IDE #2"   },           /* IRQ #13      IRL=2   0x3a0  */
  42         { MICRODEV_FPGA_IRQ_IDE1,       1,      "IDE #1"   },           /* IRQ #14      IRL=1   0x3c0  */
  43         { 0,                            0,      "unused"   },           /* IRQ #15      IRL=0   0x3e0  */
  44 };
  45
  46 #if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
  47 #  error Inconsistancy in defining the IRQ# for Keyboard!
  48 #endif
  49
  50 #if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
  51 #  error Inconsistancy in defining the IRQ# for Ethernet!
  52 #endif
  53
  54 #if (MICRODEV_LINUX_IRQ_USB_HC != 7)
  55 #  error Inconsistancy in defining the IRQ# for USB!
  56 #endif
  57
  58 #if (MICRODEV_LINUX_IRQ_MOUSE != 12)
  59 #  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
  60 #endif
  61
  62 #if (MICRODEV_LINUX_IRQ_IDE2 != 13)
  63 #  error Inconsistancy in defining the IRQ# for secondary IDE!
  64 #endif
  65
  66 #if (MICRODEV_LINUX_IRQ_IDE1 != 14)
  67 #  error Inconsistancy in defining the IRQ# for primary IDE!
  68 #endif
  69
  70 static void enable_microdev_irq(unsigned int irq);
  71 static void disable_microdev_irq(unsigned int irq);
  72
  73         /* shutdown is same as "disable" */
  74 #define shutdown_microdev_irq disable_microdev_irq
  75
  76 static void mask_and_ack_microdev(unsigned int);
  77 static void end_microdev_irq(unsigned int irq);
  78
  79 static unsigned int startup_microdev_irq(unsigned int irq)
  80 {
  81         enable_microdev_irq(irq);
  82         return 0;               /* never anything pending */
  83 }
  84
  85 static struct hw_interrupt_type microdev_irq_type = {
  86         .typename = "MicroDev-IRQ",
  87         .startup = startup_microdev_irq,
  88         .shutdown = shutdown_microdev_irq,
  89         .enable = enable_microdev_irq,
  90         .disable = disable_microdev_irq,
  91         .ack = mask_and_ack_microdev,
  92         .end = end_microdev_irq
  93 };
  94
  95 static void disable_microdev_irq(unsigned int irq)
  96 {
  97         unsigned int flags;
  98         unsigned int fpgaIrq;
  99
 100         if (irq >= NUM_EXTERNAL_IRQS) return;
 101         if (!fpgaIrqTable[irq].mapped) return;
 102
 103         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 104
 105                 /* disable interrupts */
 106         local_irq_save(flags);
 107
 108                 /* disable interupts on the FPGA INTC register */
 109         ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
 110
 111                 /* restore interrupts */
 112         local_irq_restore(flags);
 113 }
 114
 115 static void enable_microdev_irq(unsigned int irq)
 116 {
 117         unsigned long priorityReg, priorities, pri;
 118         unsigned int flags;
 119         unsigned int fpgaIrq;
 120
 121
 122         if (irq >= NUM_EXTERNAL_IRQS) return;
 123         if (!fpgaIrqTable[irq].mapped) return;
 124
 125         pri = 15 - irq;
 126
 127         fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
 128         priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
 129
 130                 /* disable interrupts */
 131         local_irq_save(flags);
 132
 133                 /* set priority for the interrupt */
 134         priorities = ctrl_inl(priorityReg);
 135         priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
 136         priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
 137         ctrl_outl(priorities, priorityReg);
 138
 139                 /* enable interupts on the FPGA INTC register */
 140         ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
 141
 142                 /* restore interrupts */
 143         local_irq_restore(flags);
 144 }
 145
 146         /* This functions sets the desired irq handler to be a MicroDev type */
 147 static void __init make_microdev_irq(unsigned int irq)
 148 {
 149         disable_irq_nosync(irq);
 150         irq_desc[irq].handler = &microdev_irq_type;
 151         disable_microdev_irq(irq);
 152 }
 153
 154 static void mask_and_ack_microdev(unsigned int irq)
 155 {
 156         disable_microdev_irq(irq);
 157 }
 158
 159 static void end_microdev_irq(unsigned int irq)
 160 {
 161         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 162         {
 163                 enable_microdev_irq(irq);
 164         }
 165 }
 166
 167 extern void __init init_microdev_irq(void)
 168 {
 169         int i;
 170
 171                 /* disable interupts on the FPGA INTC register */
 172         ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG);
 173
 174         for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
 175         {
 176                 make_microdev_irq(i);
 177         }
 178 }
 179
 180 extern void microdev_print_fpga_intc_status(void)
 181 {
 182         volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
 183         volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
 184         volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
 185         volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
 186         volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
 187         volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
 188         volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
 189         volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
 190
 191         printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
 192         printk("FPGA_INTENB = 0x%08x\n", *intenb);
 193         printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
 194         printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
 195         printk("FPGA_INTREQ = 0x%08x\n", *intreq);
 196         printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
 197         printk("-------------------------------------------------------------------------------\n");
 198 }
 199
 200