arch/alpha/kernel/sys_miata.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_miata.c
   3  *
   4  *      Copyright (C) 1995 David A Rusling
   5  *      Copyright (C) 1996 Jay A Estabrook
   6  *      Copyright (C) 1998, 1999, 2000 Richard Henderson
   7  *
   8  * Code supporting the MIATA (EV56+PYXIS).
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/mm.h>
  14 #include <linux/sched.h>
  15 #include <linux/pci.h>
  16 #include <linux/init.h>
  17 #include <linux/reboot.h>
  18
  19 #include <asm/ptrace.h>
  20 #include <asm/dma.h>
  21 #include <asm/irq.h>
  22 #include <asm/mmu_context.h>
  23 #include <asm/io.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/core_cia.h>
  26 #include <asm/tlbflush.h>
  27
  28 #include "proto.h"
  29 #include "irq_impl.h"
  30 #include "pci_impl.h"
  31 #include "machvec_impl.h"
  32
  33
  34 static void
  35 miata_srm_device_interrupt(unsigned long vector)
  36 {
  37         int irq;
  38
  39         irq = (vector - 0x800) >> 4;
  40
  41         /*
  42          * I really hate to do this, but the MIATA SRM console ignores the
  43          *  low 8 bits in the interrupt summary register, and reports the
  44          *  vector 0x80 *lower* than I expected from the bit numbering in
  45          *  the documentation.
  46          * This was done because the low 8 summary bits really aren't used
  47          *  for reporting any interrupts (the PCI-ISA bridge, bit 7, isn't
  48          *  used for this purpose, as PIC interrupts are delivered as the
  49          *  vectors 0x800-0x8f0).
  50          * But I really don't want to change the fixup code for allocation
  51          *  of IRQs, nor the alpha_irq_mask maintenance stuff, both of which
  52          *  look nice and clean now.
  53          * So, here's this grotty hack... :-(
  54          */
  55         if (irq >= 16)
  56                 irq = irq + 8;
  57
  58         handle_irq(irq);
  59 }
  60
  61 static void __init
  62 miata_init_irq(void)
  63 {
  64         if (alpha_using_srm)
  65                 alpha_mv.device_interrupt = miata_srm_device_interrupt;
  66
  67 #if 0
  68         /* These break on MiataGL so we'll try not to do it at all.  */
  69         *(vulp)PYXIS_INT_HILO = 0x000000B2UL; mb();     /* ISA/NMI HI */
  70         *(vulp)PYXIS_RT_COUNT = 0UL; mb();              /* clear count */
  71 #endif
  72
  73         init_i8259a_irqs();
  74
  75         /* Not interested in the bogus interrupts (3,10), Fan Fault (0),
  76            NMI (1), or EIDE (9).
  77
  78            We also disable the risers (4,5), since we don't know how to
  79            route the interrupts behind the bridge.  */
  80         init_pyxis_irqs(0x63b0000);
  81
  82         common_init_isa_dma();
  83         setup_irq(16+2, &halt_switch_irqaction);        /* SRM only? */
  84         setup_irq(16+6, &timer_cascade_irqaction);
  85 }
  86
  87
  88 /*
  89  * PCI Fixup configuration.
  90  *
  91  * Summary @ PYXIS_INT_REQ:
  92  * Bit      Meaning
  93  * 0        Fan Fault
  94  * 1        NMI
  95  * 2        Halt/Reset switch
  96  * 3        none
  97  * 4        CID0 (Riser ID)
  98  * 5        CID1 (Riser ID)
  99  * 6        Interval timer
 100  * 7        PCI-ISA Bridge
 101  * 8        Ethernet
 102  * 9        EIDE (deprecated, ISA 14/15 used)
 103  *10        none
 104  *11        USB
 105  *12        Interrupt Line A from slot 4
 106  *13        Interrupt Line B from slot 4
 107  *14        Interrupt Line C from slot 4
 108  *15        Interrupt Line D from slot 4
 109  *16        Interrupt Line A from slot 5
 110  *17        Interrupt line B from slot 5
 111  *18        Interrupt Line C from slot 5
 112  *19        Interrupt Line D from slot 5
 113  *20        Interrupt Line A from slot 1
 114  *21        Interrupt Line B from slot 1
 115  *22        Interrupt Line C from slot 1
 116  *23        Interrupt Line D from slot 1
 117  *24        Interrupt Line A from slot 2
 118  *25        Interrupt Line B from slot 2
 119  *26        Interrupt Line C from slot 2
 120  *27        Interrupt Line D from slot 2
 121  *27        Interrupt Line A from slot 3
 122  *29        Interrupt Line B from slot 3
 123  *30        Interrupt Line C from slot 3
 124  *31        Interrupt Line D from slot 3
 125  *
 126  * The device to slot mapping looks like:
 127  *
 128  * Slot     Device
 129  *  3       DC21142 Ethernet
 130  *  4       EIDE CMD646
 131  *  5       none
 132  *  6       USB
 133  *  7       PCI-ISA bridge
 134  *  8       PCI-PCI Bridge      (SBU Riser)
 135  *  9       none
 136  * 10       none
 137  * 11       PCI on board slot 4 (SBU Riser)
 138  * 12       PCI on board slot 5 (SBU Riser)
 139  *
 140  *  These are behind the bridge, so I'm not sure what to do...
 141  *
 142  * 13       PCI on board slot 1 (SBU Riser)
 143  * 14       PCI on board slot 2 (SBU Riser)
 144  * 15       PCI on board slot 3 (SBU Riser)
 145  *
 146  *
 147  * This two layered interrupt approach means that we allocate IRQ 16 and
 148  * above for PCI interrupts.  The IRQ relates to which bit the interrupt
 149  * comes in on.  This makes interrupt processing much easier.
 150  */
 151
 152 static int __init
 153 miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 154 {
 155         static char irq_tab[18][5] __initdata = {
 156                 /*INT    INTA   INTB   INTC   INTD */
 157                 {16+ 8, 16+ 8, 16+ 8, 16+ 8, 16+ 8},  /* IdSel 14,  DC21142 */
 158                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 15,  EIDE    */
 159                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 16,  none    */
 160                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 17,  none    */
 161                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 18,  PCI-ISA */
 162                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 19,  PCI-PCI */
 163                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 20,  none    */
 164                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 21,  none    */
 165                 {16+12, 16+12, 16+13, 16+14, 16+15},  /* IdSel 22,  slot 4  */
 166                 {16+16, 16+16, 16+17, 16+18, 16+19},  /* IdSel 23,  slot 5  */
 167                 /* the next 7 are actually on PCI bus 1, across the bridge */
 168                 {16+11, 16+11, 16+11, 16+11, 16+11},  /* IdSel 24,  QLISP/GL*/
 169                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 25,  none    */
 170                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 26,  none    */
 171                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 27,  none    */
 172                 {16+20, 16+20, 16+21, 16+22, 16+23},  /* IdSel 28,  slot 1  */
 173                 {16+24, 16+24, 16+25, 16+26, 16+27},  /* IdSel 29,  slot 2  */
 174                 {16+28, 16+28, 16+29, 16+30, 16+31},  /* IdSel 30,  slot 3  */
 175                 /* This bridge is on the main bus of the later orig MIATA */
 176                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 31,  PCI-PCI */
 177         };
 178         const long min_idsel = 3, max_idsel = 20, irqs_per_slot = 5;
 179
 180         /* the USB function of the 82c693 has it's interrupt connected to
 181            the 2nd 8259 controller. So we have to check for it first. */
 182
 183         if((slot == 7) && (PCI_FUNC(dev->devfn) == 3)) {
 184                 u8 irq=0;
 185                 struct pci_dev *pdev = pci_get_slot(dev->bus, dev->devfn & ~7);
 186                 if(pdev == NULL || pci_read_config_byte(pdev, 0x40,&irq) != PCIBIOS_SUCCESSFUL) {
 187                         pci_dev_put(pdev);
 188                         return -1;
 189                 }
 190                 else    {
 191                         pci_dev_put(pdev);
 192                         return irq;
 193                 }
 194         }
 195
 196         return COMMON_TABLE_LOOKUP;
 197 }
 198
 199 static u8 __init
 200 miata_swizzle(struct pci_dev *dev, u8 *pinp)
 201 {
 202         int slot, pin = *pinp;
 203
 204         if (dev->bus->number == 0) {
 205                 slot = PCI_SLOT(dev->devfn);
 206         }
 207         /* Check for the built-in bridge.  */
 208         else if ((PCI_SLOT(dev->bus->self->devfn) == 8) ||
 209                  (PCI_SLOT(dev->bus->self->devfn) == 20)) {
 210                 slot = PCI_SLOT(dev->devfn) + 9;
 211         }
 212         else
 213         {
 214                 /* Must be a card-based bridge.  */
 215                 do {
 216                         if ((PCI_SLOT(dev->bus->self->devfn) == 8) ||
 217                             (PCI_SLOT(dev->bus->self->devfn) == 20)) {
 218                                 slot = PCI_SLOT(dev->devfn) + 9;
 219                                 break;
 220                         }
 221                         pin = pci_swizzle_interrupt_pin(dev, pin);
 222
 223                         /* Move up the chain of bridges.  */
 224                         dev = dev->bus->self;
 225                         /* Slot of the next bridge.  */
 226                         slot = PCI_SLOT(dev->devfn);
 227                 } while (dev->bus->self);
 228         }
 229         *pinp = pin;
 230         return slot;
 231 }
 232
 233 static void __init
 234 miata_init_pci(void)
 235 {
 236         cia_init_pci();
 237         SMC669_Init(0); /* it might be a GL (fails harmlessly if not) */
 238         es1888_init();
 239 }
 240
 241 static void
 242 miata_kill_arch(int mode)
 243 {
 244         cia_kill_arch(mode);
 245
 246 #ifndef ALPHA_RESTORE_SRM_SETUP
 247         switch(mode) {
 248         case LINUX_REBOOT_CMD_RESTART:
 249                 /* Who said DEC engineers have no sense of humor? ;-)  */
 250                 if (alpha_using_srm) {
 251                         *(vuip) PYXIS_RESET = 0x0000dead;
 252                         mb();
 253                 }
 254                 break;
 255         case LINUX_REBOOT_CMD_HALT:
 256                 break;
 257         case LINUX_REBOOT_CMD_POWER_OFF:
 258                 break;
 259         }
 260
 261         halt();
 262 #endif
 263 }
 264
 265
 266 /*
 267  * The System Vector
 268  */
 269
 270 struct alpha_machine_vector miata_mv __initmv = {
 271         .vector_name            = "Miata",
 272         DO_EV5_MMU,
 273         DO_DEFAULT_RTC,
 274         DO_PYXIS_IO,
 275         .machine_check          = cia_machine_check,
 276         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 277         .min_io_address         = DEFAULT_IO_BASE,
 278         .min_mem_address        = DEFAULT_MEM_BASE,
 279         .pci_dac_offset         = PYXIS_DAC_OFFSET,
 280
 281         .nr_irqs                = 48,
 282         .device_interrupt       = pyxis_device_interrupt,
 283
 284         .init_arch              = pyxis_init_arch,
 285         .init_irq               = miata_init_irq,
 286         .init_rtc               = common_init_rtc,
 287         .init_pci               = miata_init_pci,
 288         .kill_arch              = miata_kill_arch,
 289         .pci_map_irq            = miata_map_irq,
 290         .pci_swizzle            = miata_swizzle,
 291 };
 292 ALIAS_MV(miata)