linux/arch/alpha/kernel/sys_mikasa.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *      linux/arch/alpha/kernel/sys_mikasa.c
   4 *
   5 *      Copyright (C) 1995 David A Rusling
   6 *      Copyright (C) 1996 Jay A Estabrook
   7 *      Copyright (C) 1998, 1999 Richard Henderson
   8 *
   9 * Code supporting the MIKASA (AlphaServer 1000).
  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/bitops.h>
  19
  20#include <asm/ptrace.h>
  21#include <asm/mce.h>
  22#include <asm/dma.h>
  23#include <asm/irq.h>
  24#include <asm/mmu_context.h>
  25#include <asm/io.h>
  26#include <asm/core_apecs.h>
  27#include <asm/core_cia.h>
  28#include <asm/tlbflush.h>
  29
  30#include "proto.h"
  31#include "irq_impl.h"
  32#include "pci_impl.h"
  33#include "machvec_impl.h"
  34
  35
  36/* Note mask bit is true for ENABLED irqs.  */
  37static int cached_irq_mask;
  38
  39static inline void
  40mikasa_update_irq_hw(int mask)
  41{
  42        outw(mask, 0x536);
  43}
  44
  45static inline void
  46mikasa_enable_irq(struct irq_data *d)
  47{
  48        mikasa_update_irq_hw(cached_irq_mask |= 1 << (d->irq - 16));
  49}
  50
  51static void
  52mikasa_disable_irq(struct irq_data *d)
  53{
  54        mikasa_update_irq_hw(cached_irq_mask &= ~(1 << (d->irq - 16)));
  55}
  56
  57static struct irq_chip mikasa_irq_type = {
  58        .name           = "MIKASA",
  59        .irq_unmask     = mikasa_enable_irq,
  60        .irq_mask       = mikasa_disable_irq,
  61        .irq_mask_ack   = mikasa_disable_irq,
  62};
  63
  64static void 
  65mikasa_device_interrupt(unsigned long vector)
  66{
  67        unsigned long pld;
  68        unsigned int i;
  69
  70        /* Read the interrupt summary registers */
  71        pld = (((~inw(0x534) & 0x0000ffffUL) << 16)
  72               | (((unsigned long) inb(0xa0)) << 8)
  73               | inb(0x20));
  74
  75        /*
  76         * Now for every possible bit set, work through them and call
  77         * the appropriate interrupt handler.
  78         */
  79        while (pld) {
  80                i = ffz(~pld);
  81                pld &= pld - 1; /* clear least bit set */
  82                if (i < 16) {
  83                        isa_device_interrupt(vector);
  84                } else {
  85                        handle_irq(i);
  86                }
  87        }
  88}
  89
  90static void __init
  91mikasa_init_irq(void)
  92{
  93        long i;
  94
  95        if (alpha_using_srm)
  96                alpha_mv.device_interrupt = srm_device_interrupt;
  97
  98        mikasa_update_irq_hw(0);
  99
 100        for (i = 16; i < 32; ++i) {
 101                irq_set_chip_and_handler(i, &mikasa_irq_type,
 102                                         handle_level_irq);
 103                irq_set_status_flags(i, IRQ_LEVEL);
 104        }
 105
 106        init_i8259a_irqs();
 107        common_init_isa_dma();
 108}
 109
 110
 111/*
 112 * PCI Fixup configuration.
 113 *
 114 * Summary @ 0x536:
 115 * Bit      Meaning
 116 * 0        Interrupt Line A from slot 0
 117 * 1        Interrupt Line B from slot 0
 118 * 2        Interrupt Line C from slot 0
 119 * 3        Interrupt Line D from slot 0
 120 * 4        Interrupt Line A from slot 1
 121 * 5        Interrupt line B from slot 1
 122 * 6        Interrupt Line C from slot 1
 123 * 7        Interrupt Line D from slot 1
 124 * 8        Interrupt Line A from slot 2
 125 * 9        Interrupt Line B from slot 2
 126 *10        Interrupt Line C from slot 2
 127 *11        Interrupt Line D from slot 2
 128 *12        NCR 810 SCSI
 129 *13        Power Supply Fail
 130 *14        Temperature Warn
 131 *15        Reserved
 132 *
 133 * The device to slot mapping looks like:
 134 *
 135 * Slot     Device
 136 *  6       NCR SCSI controller
 137 *  7       Intel PCI-EISA bridge chip
 138 * 11       PCI on board slot 0
 139 * 12       PCI on board slot 1
 140 * 13       PCI on board slot 2
 141 *   
 142 *
 143 * This two layered interrupt approach means that we allocate IRQ 16 and 
 144 * above for PCI interrupts.  The IRQ relates to which bit the interrupt
 145 * comes in on.  This makes interrupt processing much easier.
 146 */
 147
 148static int
 149mikasa_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 150{
 151        static char irq_tab[8][5] = {
 152                /*INT    INTA   INTB   INTC   INTD */
 153                {16+12, 16+12, 16+12, 16+12, 16+12},    /* IdSel 17,  SCSI */
 154                {   -1,    -1,    -1,    -1,    -1},    /* IdSel 18,  PCEB */
 155                {   -1,    -1,    -1,    -1,    -1},    /* IdSel 19,  ???? */
 156                {   -1,    -1,    -1,    -1,    -1},    /* IdSel 20,  ???? */
 157                {   -1,    -1,    -1,    -1,    -1},    /* IdSel 21,  ???? */
 158                { 16+0,  16+0,  16+1,  16+2,  16+3},    /* IdSel 22,  slot 0 */
 159                { 16+4,  16+4,  16+5,  16+6,  16+7},    /* IdSel 23,  slot 1 */
 160                { 16+8,  16+8,  16+9, 16+10, 16+11},    /* IdSel 24,  slot 2 */
 161        };
 162        const long min_idsel = 6, max_idsel = 13, irqs_per_slot = 5;
 163        return COMMON_TABLE_LOOKUP;
 164}
 165
 166
 167#if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
 168static void
 169mikasa_apecs_machine_check(unsigned long vector, unsigned long la_ptr)
 170{
 171#define MCHK_NO_DEVSEL 0x205U
 172#define MCHK_NO_TABT 0x204U
 173
 174        struct el_common *mchk_header;
 175        unsigned int code;
 176
 177        mchk_header = (struct el_common *)la_ptr;
 178
 179        /* Clear the error before any reporting.  */
 180        mb();
 181        mb(); /* magic */
 182        draina();
 183        apecs_pci_clr_err();
 184        wrmces(0x7);
 185        mb();
 186
 187        code = mchk_header->code;
 188        process_mcheck_info(vector, la_ptr, "MIKASA APECS",
 189                            (mcheck_expected(0)
 190                             && (code == MCHK_NO_DEVSEL
 191                                 || code == MCHK_NO_TABT)));
 192}
 193#endif
 194
 195
 196/*
 197 * The System Vector
 198 */
 199
 200#if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
 201struct alpha_machine_vector mikasa_mv __initmv = {
 202        .vector_name            = "Mikasa",
 203        DO_EV4_MMU,
 204        DO_DEFAULT_RTC,
 205        DO_APECS_IO,
 206        .machine_check          = mikasa_apecs_machine_check,
 207        .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 208        .min_io_address         = DEFAULT_IO_BASE,
 209        .min_mem_address        = APECS_AND_LCA_DEFAULT_MEM_BASE,
 210
 211        .nr_irqs                = 32,
 212        .device_interrupt       = mikasa_device_interrupt,
 213
 214        .init_arch              = apecs_init_arch,
 215        .init_irq               = mikasa_init_irq,
 216        .init_rtc               = common_init_rtc,
 217        .init_pci               = common_init_pci,
 218        .pci_map_irq            = mikasa_map_irq,
 219        .pci_swizzle            = common_swizzle,
 220};
 221ALIAS_MV(mikasa)
 222#endif
 223
 224#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
 225struct alpha_machine_vector mikasa_primo_mv __initmv = {
 226        .vector_name            = "Mikasa-Primo",
 227        DO_EV5_MMU,
 228        DO_DEFAULT_RTC,
 229        DO_CIA_IO,
 230        .machine_check          = cia_machine_check,
 231        .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 232        .min_io_address         = DEFAULT_IO_BASE,
 233        .min_mem_address        = CIA_DEFAULT_MEM_BASE,
 234
 235        .nr_irqs                = 32,
 236        .device_interrupt       = mikasa_device_interrupt,
 237
 238        .init_arch              = cia_init_arch,
 239        .init_irq               = mikasa_init_irq,
 240        .init_rtc               = common_init_rtc,
 241        .init_pci               = cia_init_pci,
 242        .kill_arch              = cia_kill_arch,
 243        .pci_map_irq            = mikasa_map_irq,
 244        .pci_swizzle            = common_swizzle,
 245};
 246ALIAS_MV(mikasa_primo)
 247#endif
 248