arch/alpha/kernel/sys_mikasa.c

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