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sys_jensen.c

/*
 *    linux/arch/alpha/kernel/sys_jensen.c
 *
 *    Copyright (C) 1995 Linus Torvalds
 *    Copyright (C) 1998, 1999 Richard Henderson
 *
 * Code supporting the Jensen.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/init.h>

#include <asm/ptrace.h>
#include <asm/system.h>

#define __EXTERN_INLINE inline
#include <asm/io.h>
#include <asm/jensen.h>
#undef  __EXTERN_INLINE

#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>

#include "proto.h"
#include "irq_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"


/*
 * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
 * 0x9X0 for the local motherboard interrupts.
 *
 * Note especially that those local interrupts CANNOT be masked,
 * which causes much of the pain below...
 *
 *    0x660 - NMI
 *
 *    0x800 - IRQ0  interval timer (not used, as we use the RTC timer)
 *    0x810 - IRQ1  line printer (duh..)
 *    0x860 - IRQ6  floppy disk
 *
 *    0x900 - COM1
 *    0x920 - COM2
 *    0x980 - keyboard
 *    0x990 - mouse
 *
 * PCI-based systems are more sane: they don't have the local
 * interrupts at all, and have only normal PCI interrupts from
 * devices.  Happily it's easy enough to do a sane mapping from the
 * Jensen.
 * 
 * Note that this means that we may have to do a hardware
 * "local_op" to a different interrupt than we report to the rest of the
 * world.
 */

static unsigned int
jensen_local_startup(unsigned int irq)
{
      /* the parport is really hw IRQ 1, silly Jensen.  */
      if (irq == 7)
            i8259a_startup_irq(1);
      else
            /*
             * For all true local interrupts, set the flag that prevents
             * the IPL from being dropped during handler processing.
             */
            if (irq_desc[irq].action)
                  irq_desc[irq].action->flags |= IRQF_DISABLED;
      return 0;
}

static void
jensen_local_shutdown(unsigned int irq)
{
      /* the parport is really hw IRQ 1, silly Jensen.  */
      if (irq == 7)
            i8259a_disable_irq(1);
}

static void
jensen_local_enable(unsigned int irq)
{
      /* the parport is really hw IRQ 1, silly Jensen.  */
      if (irq == 7)
            i8259a_enable_irq(1);
}

static void
jensen_local_disable(unsigned int irq)
{
      /* the parport is really hw IRQ 1, silly Jensen.  */
      if (irq == 7)
            i8259a_disable_irq(1);
}

static void
jensen_local_ack(unsigned int irq)
{
      /* the parport is really hw IRQ 1, silly Jensen.  */
      if (irq == 7)
            i8259a_mask_and_ack_irq(1);
}

static void
jensen_local_end(unsigned int irq)
{
      /* the parport is really hw IRQ 1, silly Jensen.  */
      if (irq == 7)
            i8259a_end_irq(1);
}

static struct hw_interrupt_type jensen_local_irq_type = {
      .typename   = "LOCAL",
      .startup    = jensen_local_startup,
      .shutdown   = jensen_local_shutdown,
      .enable           = jensen_local_enable,
      .disable    = jensen_local_disable,
      .ack        = jensen_local_ack,
      .end        = jensen_local_end,
};

static void 
jensen_device_interrupt(unsigned long vector)
{
      int irq;

      switch (vector) {
      case 0x660:
            printk("Whee.. NMI received. Probable hardware error\n");
            printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
            return;

      /* local device interrupts: */
      case 0x900: irq = 4; break;         /* com1 -> irq 4 */
      case 0x920: irq = 3; break;         /* com2 -> irq 3 */
      case 0x980: irq = 1; break;         /* kbd -> irq 1 */
      case 0x990: irq = 9; break;         /* mouse -> irq 9 */

      default:
            if (vector > 0x900) {
                  printk("Unknown local interrupt %lx\n", vector);
                  return;
            }

            irq = (vector - 0x800) >> 4;
            if (irq == 1)
                  irq = 7;
            break;
      }

      /* If there is no handler yet... */
      if (irq_desc[irq].action == NULL) {
          /* If it is a local interrupt that cannot be masked... */
          if (vector >= 0x900)
          {
              /* Clear keyboard/mouse state */
            inb(0x64);
            inb(0x60);
            /* Reset serial ports */
            inb(0x3fa);
            inb(0x2fa);
            outb(0x0c, 0x3fc);
            outb(0x0c, 0x2fc);
            /* Clear NMI */
            outb(0,0x61);
            outb(0,0x461);
          }
      }

#if 0
        /* A useful bit of code to find out if an interrupt is going wild.  */
        {
          static unsigned int last_msg = 0, last_cc = 0;
          static int last_irq = -1, count = 0;
          unsigned int cc;

          __asm __volatile("rpcc %0" : "=r"(cc));
          ++count;
#define JENSEN_CYCLES_PER_SEC (150000000)
          if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
            irq != last_irq) {
                printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
                       irq, count, cc-last_cc, get_irq_regs()->pc);
                count = 0;
                last_msg = cc;
                last_irq = irq;
          }
          last_cc = cc;
        }
#endif

      handle_irq(irq);
}

static void __init
jensen_init_irq(void)
{
      init_i8259a_irqs();

      irq_desc[1].chip = &jensen_local_irq_type;
      irq_desc[4].chip = &jensen_local_irq_type;
      irq_desc[3].chip = &jensen_local_irq_type;
      irq_desc[7].chip = &jensen_local_irq_type;
      irq_desc[9].chip = &jensen_local_irq_type;

      common_init_isa_dma();
}

static void __init
jensen_init_arch(void)
{
      struct pci_controller *hose;
#ifdef CONFIG_PCI
      static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };

      isa_bridge = &fake_isa_bridge;
#endif

      /* Create a hose so that we can report i/o base addresses to
         userland.  */

      pci_isa_hose = hose = alloc_pci_controller();
      hose->io_space = &ioport_resource;
      hose->mem_space = &iomem_resource;
      hose->index = 0;

      hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
      hose->dense_mem_base = 0;
      hose->sparse_io_base = EISA_IO - IDENT_ADDR;
      hose->dense_io_base = 0;

      hose->sg_isa = hose->sg_pci = NULL;
      __direct_map_base = 0;
      __direct_map_size = 0xffffffff;
}

static void
jensen_machine_check (u64 vector, u64 la)
{
      printk(KERN_CRIT "Machine check\n");
}


/*
 * The System Vector
 */

struct alpha_machine_vector jensen_mv __initmv = {
      .vector_name            = "Jensen",
      DO_EV4_MMU,
      IO_LITE(JENSEN,jensen),
      .machine_check          = jensen_machine_check,
      .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
      .rtc_port         = 0x170,

      .nr_irqs          = 16,
      .device_interrupt = jensen_device_interrupt,

      .init_arch        = jensen_init_arch,
      .init_irq         = jensen_init_irq,
      .init_rtc         = common_init_rtc,
      .init_pci         = NULL,
      .kill_arch        = NULL,
};
ALIAS_MV(jensen)

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