arch/alpha/kernel/sys_jensen.c

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