arch/alpha/kernel/sys_miata.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/sys_miata.c
   4  *
   5  *      Copyright (C) 1995 David A Rusling
   6  *      Copyright (C) 1996 Jay A Estabrook
   7  *      Copyright (C) 1998, 1999, 2000 Richard Henderson
   8  *
   9  * Code supporting the MIATA (EV56+PYXIS).
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/mm.h>
  15 #include <linux/sched.h>
  16 #include <linux/pci.h>
  17 #include <linux/init.h>
  18 #include <linux/reboot.h>
  19
  20 #include <asm/ptrace.h>
  21 #include <asm/dma.h>
  22 #include <asm/irq.h>
  23 #include <asm/mmu_context.h>
  24 #include <asm/io.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/core_cia.h>
  27 #include <asm/tlbflush.h>
  28
  29 #include "proto.h"
  30 #include "irq_impl.h"
  31 #include "pci_impl.h"
  32 #include "machvec_impl.h"
  33
  34
  35 static void
  36 miata_srm_device_interrupt(unsigned long vector)
  37 {
  38         int irq;
  39
  40         irq = (vector - 0x800) >> 4;
  41
  42         /*
  43          * I really hate to do this, but the MIATA SRM console ignores the
  44          *  low 8 bits in the interrupt summary register, and reports the
  45          *  vector 0x80 *lower* than I expected from the bit numbering in
  46          *  the documentation.
  47          * This was done because the low 8 summary bits really aren't used
  48          *  for reporting any interrupts (the PCI-ISA bridge, bit 7, isn't
  49          *  used for this purpose, as PIC interrupts are delivered as the
  50          *  vectors 0x800-0x8f0).
  51          * But I really don't want to change the fixup code for allocation
  52          *  of IRQs, nor the alpha_irq_mask maintenance stuff, both of which
  53          *  look nice and clean now.
  54          * So, here's this grotty hack... :-(
  55          */
  56         if (irq >= 16)
  57                 irq = irq + 8;
  58
  59         handle_irq(irq);
  60 }
  61
  62 static void __init
  63 miata_init_irq(void)
  64 {
  65         if (alpha_using_srm)
  66                 alpha_mv.device_interrupt = miata_srm_device_interrupt;
  67
  68 #if 0
  69         /* These break on MiataGL so we'll try not to do it at all.  */
  70         *(vulp)PYXIS_INT_HILO = 0x000000B2UL; mb();     /* ISA/NMI HI */
  71         *(vulp)PYXIS_RT_COUNT = 0UL; mb();              /* clear count */
  72 #endif
  73
  74         init_i8259a_irqs();
  75
  76         /* Not interested in the bogus interrupts (3,10), Fan Fault (0),
  77            NMI (1), or EIDE (9).
  78
  79            We also disable the risers (4,5), since we don't know how to
  80            route the interrupts behind the bridge.  */
  81         init_pyxis_irqs(0x63b0000);
  82
  83         common_init_isa_dma();
  84         setup_irq(16+2, &halt_switch_irqaction);        /* SRM only? */
  85         setup_irq(16+6, &timer_cascade_irqaction);
  86 }
  87
  88
  89 /*
  90  * PCI Fixup configuration.
  91  *
  92  * Summary @ PYXIS_INT_REQ:
  93  * Bit      Meaning
  94  * 0        Fan Fault
  95  * 1        NMI
  96  * 2        Halt/Reset switch
  97  * 3        none
  98  * 4        CID0 (Riser ID)
  99  * 5        CID1 (Riser ID)
 100  * 6        Interval timer
 101  * 7        PCI-ISA Bridge
 102  * 8        Ethernet
 103  * 9        EIDE (deprecated, ISA 14/15 used)
 104  *10        none
 105  *11        USB
 106  *12        Interrupt Line A from slot 4
 107  *13        Interrupt Line B from slot 4
 108  *14        Interrupt Line C from slot 4
 109  *15        Interrupt Line D from slot 4
 110  *16        Interrupt Line A from slot 5
 111  *17        Interrupt line B from slot 5
 112  *18        Interrupt Line C from slot 5
 113  *19        Interrupt Line D from slot 5
 114  *20        Interrupt Line A from slot 1
 115  *21        Interrupt Line B from slot 1
 116  *22        Interrupt Line C from slot 1
 117  *23        Interrupt Line D from slot 1
 118  *24        Interrupt Line A from slot 2
 119  *25        Interrupt Line B from slot 2
 120  *26        Interrupt Line C from slot 2
 121  *27        Interrupt Line D from slot 2
 122  *27        Interrupt Line A from slot 3
 123  *29        Interrupt Line B from slot 3
 124  *30        Interrupt Line C from slot 3
 125  *31        Interrupt Line D from slot 3
 126  *
 127  * The device to slot mapping looks like:
 128  *
 129  * Slot     Device
 130  *  3       DC21142 Ethernet
 131  *  4       EIDE CMD646
 132  *  5       none
 133  *  6       USB
 134  *  7       PCI-ISA bridge
 135  *  8       PCI-PCI Bridge      (SBU Riser)
 136  *  9       none
 137  * 10       none
 138  * 11       PCI on board slot 4 (SBU Riser)
 139  * 12       PCI on board slot 5 (SBU Riser)
 140  *
 141  *  These are behind the bridge, so I'm not sure what to do...
 142  *
 143  * 13       PCI on board slot 1 (SBU Riser)
 144  * 14       PCI on board slot 2 (SBU Riser)
 145  * 15       PCI on board slot 3 (SBU Riser)
 146  *
 147  *
 148  * This two layered interrupt approach means that we allocate IRQ 16 and
 149  * above for PCI interrupts.  The IRQ relates to which bit the interrupt
 150  * comes in on.  This makes interrupt processing much easier.
 151  */
 152
 153 static int
 154 miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 155 {
 156         static char irq_tab[18][5] = {
 157                 /*INT    INTA   INTB   INTC   INTD */
 158                 {16+ 8, 16+ 8, 16+ 8, 16+ 8, 16+ 8},  /* IdSel 14,  DC21142 */
 159                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 15,  EIDE    */
 160                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 16,  none    */
 161                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 17,  none    */
 162                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 18,  PCI-ISA */
 163                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 19,  PCI-PCI */
 164                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 20,  none    */
 165                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 21,  none    */
 166                 {16+12, 16+12, 16+13, 16+14, 16+15},  /* IdSel 22,  slot 4  */
 167                 {16+16, 16+16, 16+17, 16+18, 16+19},  /* IdSel 23,  slot 5  */
 168                 /* the next 7 are actually on PCI bus 1, across the bridge */
 169                 {16+11, 16+11, 16+11, 16+11, 16+11},  /* IdSel 24,  QLISP/GL*/
 170                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 25,  none    */
 171                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 26,  none    */
 172                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 27,  none    */
 173                 {16+20, 16+20, 16+21, 16+22, 16+23},  /* IdSel 28,  slot 1  */
 174                 {16+24, 16+24, 16+25, 16+26, 16+27},  /* IdSel 29,  slot 2  */
 175                 {16+28, 16+28, 16+29, 16+30, 16+31},  /* IdSel 30,  slot 3  */
 176                 /* This bridge is on the main bus of the later orig MIATA */
 177                 {   -1,    -1,    -1,    -1,    -1},  /* IdSel 31,  PCI-PCI */
 178         };
 179         const long min_idsel = 3, max_idsel = 20, irqs_per_slot = 5;
 180
 181         /* the USB function of the 82c693 has it's interrupt connected to
 182            the 2nd 8259 controller. So we have to check for it first. */
 183
 184         if((slot == 7) && (PCI_FUNC(dev->devfn) == 3)) {
 185                 u8 irq=0;
 186                 struct pci_dev *pdev = pci_get_slot(dev->bus, dev->devfn & ~7);
 187                 if(pdev == NULL || pci_read_config_byte(pdev, 0x40,&irq) != PCIBIOS_SUCCESSFUL) {
 188                         pci_dev_put(pdev);
 189                         return -1;
 190                 }
 191                 else    {
 192                         pci_dev_put(pdev);
 193                         return irq;
 194                 }
 195         }
 196
 197         return COMMON_TABLE_LOOKUP;
 198 }
 199
 200 static u8
 201 miata_swizzle(struct pci_dev *dev, u8 *pinp)
 202 {
 203         int slot, pin = *pinp;
 204
 205         if (dev->bus->number == 0) {
 206                 slot = PCI_SLOT(dev->devfn);
 207         }
 208         /* Check for the built-in bridge.  */
 209         else if ((PCI_SLOT(dev->bus->self->devfn) == 8) ||
 210                  (PCI_SLOT(dev->bus->self->devfn) == 20)) {
 211                 slot = PCI_SLOT(dev->devfn) + 9;
 212         }
 213         else
 214         {
 215                 /* Must be a card-based bridge.  */
 216                 do {
 217                         if ((PCI_SLOT(dev->bus->self->devfn) == 8) ||
 218                             (PCI_SLOT(dev->bus->self->devfn) == 20)) {
 219                                 slot = PCI_SLOT(dev->devfn) + 9;
 220                                 break;
 221                         }
 222                         pin = pci_swizzle_interrupt_pin(dev, pin);
 223
 224                         /* Move up the chain of bridges.  */
 225                         dev = dev->bus->self;
 226                         /* Slot of the next bridge.  */
 227                         slot = PCI_SLOT(dev->devfn);
 228                 } while (dev->bus->self);
 229         }
 230         *pinp = pin;
 231         return slot;
 232 }
 233
 234 static void __init
 235 miata_init_pci(void)
 236 {
 237         cia_init_pci();
 238         SMC669_Init(0); /* it might be a GL (fails harmlessly if not) */
 239         es1888_init();
 240 }
 241
 242 static void
 243 miata_kill_arch(int mode)
 244 {
 245         cia_kill_arch(mode);
 246
 247 #ifndef ALPHA_RESTORE_SRM_SETUP
 248         switch(mode) {
 249         case LINUX_REBOOT_CMD_RESTART:
 250                 /* Who said DEC engineers have no sense of humor? ;-)  */
 251                 if (alpha_using_srm) {
 252                         *(vuip) PYXIS_RESET = 0x0000dead;
 253                         mb();
 254                 }
 255                 break;
 256         case LINUX_REBOOT_CMD_HALT:
 257                 break;
 258         case LINUX_REBOOT_CMD_POWER_OFF:
 259                 break;
 260         }
 261
 262         halt();
 263 #endif
 264 }
 265
 266
 267 /*
 268  * The System Vector
 269  */
 270
 271 struct alpha_machine_vector miata_mv __initmv = {
 272         .vector_name            = "Miata",
 273         DO_EV5_MMU,
 274         DO_DEFAULT_RTC,
 275         DO_PYXIS_IO,
 276         .machine_check          = cia_machine_check,
 277         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 278         .min_io_address         = DEFAULT_IO_BASE,
 279         .min_mem_address        = DEFAULT_MEM_BASE,
 280         .pci_dac_offset         = PYXIS_DAC_OFFSET,
 281
 282         .nr_irqs                = 48,
 283         .device_interrupt       = pyxis_device_interrupt,
 284
 285         .init_arch              = pyxis_init_arch,
 286         .init_irq               = miata_init_irq,
 287         .init_rtc               = common_init_rtc,
 288         .init_pci               = miata_init_pci,
 289         .kill_arch              = miata_kill_arch,
 290         .pci_map_irq            = miata_map_irq,
 291         .pci_swizzle            = miata_swizzle,
 292 };
 293 ALIAS_MV(miata)