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   1 /*
   2  *      linux/arch/alpha/kernel/sys_jensen.c
   3  *
   4  *      Copyright (C) 1995 Linus Torvalds
   5  *      Copyright (C) 1998, 1999 Richard Henderson
   6  *
   7  * Code supporting the Jensen.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/mm.h>
  13 #include <linux/sched.h>
  14 #include <linux/pci.h>
  15 #include <linux/init.h>
  16
  17 #include <asm/ptrace.h>
  18 #include <asm/system.h>
  19
  20 #define __EXTERN_INLINE inline
  21 #include <asm/io.h>
  22 #include <asm/jensen.h>
  23 #undef  __EXTERN_INLINE
  24
  25 #include <asm/dma.h>
  26 #include <asm/irq.h>
  27 #include <asm/mmu_context.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/tlbflush.h>
  30
  31 #include "proto.h"
  32 #include "irq_impl.h"
  33 #include "pci_impl.h"
  34 #include "machvec_impl.h"
  35
  36
  37 /*
  38  * Jensen is special: the vector is 0x8X0 for EISA interrupt X, and
  39  * 0x9X0 for the local motherboard interrupts.
  40  *
  41  * Note especially that those local interrupts CANNOT be masked,
  42  * which causes much of the pain below...
  43  *
  44  *      0x660 - NMI
  45  *
  46  *      0x800 - IRQ0  interval timer (not used, as we use the RTC timer)
  47  *      0x810 - IRQ1  line printer (duh..)
  48  *      0x860 - IRQ6  floppy disk
  49  *
  50  *      0x900 - COM1
  51  *      0x920 - COM2
  52  *      0x980 - keyboard
  53  *      0x990 - mouse
  54  *
  55  * PCI-based systems are more sane: they don't have the local
  56  * interrupts at all, and have only normal PCI interrupts from
  57  * devices.  Happily it's easy enough to do a sane mapping from the
  58  * Jensen.
  59  *
  60  * Note that this means that we may have to do a hardware
  61  * "local_op" to a different interrupt than we report to the rest of the
  62  * world.
  63  */
  64
  65 static unsigned int
  66 jensen_local_startup(unsigned int irq)
  67 {
  68         /* the parport is really hw IRQ 1, silly Jensen.  */
  69         if (irq == 7)
  70                 i8259a_startup_irq(1);
  71         else
  72                 /*
  73                  * For all true local interrupts, set the flag that prevents
  74                  * the IPL from being dropped during handler processing.
  75                  */
  76                 if (irq_desc[irq].action)
  77                         irq_desc[irq].action->flags |= IRQF_DISABLED;
  78         return 0;
  79 }
  80
  81 static void
  82 jensen_local_shutdown(unsigned int irq)
  83 {
  84         /* the parport is really hw IRQ 1, silly Jensen.  */
  85         if (irq == 7)
  86                 i8259a_disable_irq(1);
  87 }
  88
  89 static void
  90 jensen_local_enable(unsigned int irq)
  91 {
  92         /* the parport is really hw IRQ 1, silly Jensen.  */
  93         if (irq == 7)
  94                 i8259a_enable_irq(1);
  95 }
  96
  97 static void
  98 jensen_local_disable(unsigned int irq)
  99 {
 100         /* the parport is really hw IRQ 1, silly Jensen.  */
 101         if (irq == 7)
 102                 i8259a_disable_irq(1);
 103 }
 104
 105 static void
 106 jensen_local_ack(unsigned int irq)
 107 {
 108         /* the parport is really hw IRQ 1, silly Jensen.  */
 109         if (irq == 7)
 110                 i8259a_mask_and_ack_irq(1);
 111 }
 112
 113 static void
 114 jensen_local_end(unsigned int irq)
 115 {
 116         /* the parport is really hw IRQ 1, silly Jensen.  */
 117         if (irq == 7)
 118                 i8259a_end_irq(1);
 119 }
 120
 121 static struct hw_interrupt_type jensen_local_irq_type = {
 122         .typename       = "LOCAL",
 123         .startup        = jensen_local_startup,
 124         .shutdown       = jensen_local_shutdown,
 125         .enable         = jensen_local_enable,
 126         .disable        = jensen_local_disable,
 127         .ack            = jensen_local_ack,
 128         .end            = jensen_local_end,
 129 };
 130
 131 static void
 132 jensen_device_interrupt(unsigned long vector)
 133 {
 134         int irq;
 135
 136         switch (vector) {
 137         case 0x660:
 138                 printk("Whee.. NMI received. Probable hardware error\n");
 139                 printk("61=%02x, 461=%02x\n", inb(0x61), inb(0x461));
 140                 return;
 141
 142         /* local device interrupts: */
 143         case 0x900: irq = 4; break;             /* com1 -> irq 4 */
 144         case 0x920: irq = 3; break;             /* com2 -> irq 3 */
 145         case 0x980: irq = 1; break;             /* kbd -> irq 1 */
 146         case 0x990: irq = 9; break;             /* mouse -> irq 9 */
 147
 148         default:
 149                 if (vector > 0x900) {
 150                         printk("Unknown local interrupt %lx\n", vector);
 151                         return;
 152                 }
 153
 154                 irq = (vector - 0x800) >> 4;
 155                 if (irq == 1)
 156                         irq = 7;
 157                 break;
 158         }
 159
 160         /* If there is no handler yet... */
 161         if (irq_desc[irq].action == NULL) {
 162             /* If it is a local interrupt that cannot be masked... */
 163             if (vector >= 0x900)
 164             {
 165                 /* Clear keyboard/mouse state */
 166                 inb(0x64);
 167                 inb(0x60);
 168                 /* Reset serial ports */
 169                 inb(0x3fa);
 170                 inb(0x2fa);
 171                 outb(0x0c, 0x3fc);
 172                 outb(0x0c, 0x2fc);
 173                 /* Clear NMI */
 174                 outb(0,0x61);
 175                 outb(0,0x461);
 176             }
 177         }
 178
 179 #if 0
 180         /* A useful bit of code to find out if an interrupt is going wild.  */
 181         {
 182           static unsigned int last_msg = 0, last_cc = 0;
 183           static int last_irq = -1, count = 0;
 184           unsigned int cc;
 185
 186           __asm __volatile("rpcc %0" : "=r"(cc));
 187           ++count;
 188 #define JENSEN_CYCLES_PER_SEC   (150000000)
 189           if (cc - last_msg > ((JENSEN_CYCLES_PER_SEC) * 3) ||
 190               irq != last_irq) {
 191                 printk(KERN_CRIT " irq %d count %d cc %u @ %lx\n",
 192                        irq, count, cc-last_cc, get_irq_regs()->pc);
 193                 count = 0;
 194                 last_msg = cc;
 195                 last_irq = irq;
 196           }
 197           last_cc = cc;
 198         }
 199 #endif
 200
 201         handle_irq(irq);
 202 }
 203
 204 static void __init
 205 jensen_init_irq(void)
 206 {
 207         init_i8259a_irqs();
 208
 209         irq_desc[1].chip = &jensen_local_irq_type;
 210         irq_desc[4].chip = &jensen_local_irq_type;
 211         irq_desc[3].chip = &jensen_local_irq_type;
 212         irq_desc[7].chip = &jensen_local_irq_type;
 213         irq_desc[9].chip = &jensen_local_irq_type;
 214
 215         common_init_isa_dma();
 216 }
 217
 218 static void __init
 219 jensen_init_arch(void)
 220 {
 221         struct pci_controller *hose;
 222 #ifdef CONFIG_PCI
 223         static struct pci_dev fake_isa_bridge = { .dma_mask = 0xffffffffUL, };
 224
 225         isa_bridge = &fake_isa_bridge;
 226 #endif
 227
 228         /* Create a hose so that we can report i/o base addresses to
 229            userland.  */
 230
 231         pci_isa_hose = hose = alloc_pci_controller();
 232         hose->io_space = &ioport_resource;
 233         hose->mem_space = &iomem_resource;
 234         hose->index = 0;
 235
 236         hose->sparse_mem_base = EISA_MEM - IDENT_ADDR;
 237         hose->dense_mem_base = 0;
 238         hose->sparse_io_base = EISA_IO - IDENT_ADDR;
 239         hose->dense_io_base = 0;
 240
 241         hose->sg_isa = hose->sg_pci = NULL;
 242         __direct_map_base = 0;
 243         __direct_map_size = 0xffffffff;
 244 }
 245
 246 static void
 247 jensen_machine_check (u64 vector, u64 la)
 248 {
 249         printk(KERN_CRIT "Machine check\n");
 250 }
 251
 252
 253 /*
 254  * The System Vector
 255  */
 256
 257 struct alpha_machine_vector jensen_mv __initmv = {
 258         .vector_name            = "Jensen",
 259         DO_EV4_MMU,
 260         IO_LITE(JENSEN,jensen),
 261         .machine_check          = jensen_machine_check,
 262         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 263         .rtc_port               = 0x170,
 264
 265         .nr_irqs                = 16,
 266         .device_interrupt       = jensen_device_interrupt,
 267
 268         .init_arch              = jensen_init_arch,
 269         .init_irq               = jensen_init_irq,
 270         .init_rtc               = common_init_rtc,
 271         .init_pci               = NULL,
 272         .kill_arch              = NULL,
 273 };
 274 ALIAS_MV(jensen)