arch/alpha/kernel/sys_mikasa.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_mikasa.c
   3  *
   4  *      Copyright (C) 1995 David A Rusling
   5  *      Copyright (C) 1996 Jay A Estabrook
   6  *      Copyright (C) 1998, 1999 Richard Henderson
   7  *
   8  * Code supporting the MIKASA (AlphaServer 1000).
   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/bitops.h>
  18
  19 #include <asm/ptrace.h>
  20 #include <asm/system.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_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.  */
  37 static int cached_irq_mask;
  38
  39 static inline void
  40 mikasa_update_irq_hw(int mask)
  41 {
  42         outw(mask, 0x536);
  43 }
  44
  45 static inline void
  46 mikasa_enable_irq(unsigned int irq)
  47 {
  48         mikasa_update_irq_hw(cached_irq_mask |= 1 << (irq - 16));
  49 }
  50
  51 static void
  52 mikasa_disable_irq(unsigned int irq)
  53 {
  54         mikasa_update_irq_hw(cached_irq_mask &= ~(1 << (irq - 16)));
  55 }
  56
  57 static unsigned int
  58 mikasa_startup_irq(unsigned int irq)
  59 {
  60         mikasa_enable_irq(irq);
  61         return 0;
  62 }
  63
  64 static void
  65 mikasa_end_irq(unsigned int irq)
  66 {
  67         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  68                 mikasa_enable_irq(irq);
  69 }
  70
  71 static struct irq_chip mikasa_irq_type = {
  72         .name           = "MIKASA",
  73         .startup        = mikasa_startup_irq,
  74         .shutdown       = mikasa_disable_irq,
  75         .enable         = mikasa_enable_irq,
  76         .disable        = mikasa_disable_irq,
  77         .ack            = mikasa_disable_irq,
  78         .end            = mikasa_end_irq,
  79 };
  80
  81 static void
  82 mikasa_device_interrupt(unsigned long vector)
  83 {
  84         unsigned long pld;
  85         unsigned int i;
  86
  87         /* Read the interrupt summary registers */
  88         pld = (((~inw(0x534) & 0x0000ffffUL) << 16)
  89                | (((unsigned long) inb(0xa0)) << 8)
  90                | inb(0x20));
  91
  92         /*
  93          * Now for every possible bit set, work through them and call
  94          * the appropriate interrupt handler.
  95          */
  96         while (pld) {
  97                 i = ffz(~pld);
  98                 pld &= pld - 1; /* clear least bit set */
  99                 if (i < 16) {
 100                         isa_device_interrupt(vector);
 101                 } else {
 102                         handle_irq(i);
 103                 }
 104         }
 105 }
 106
 107 static void __init
 108 mikasa_init_irq(void)
 109 {
 110         long i;
 111
 112         if (alpha_using_srm)
 113                 alpha_mv.device_interrupt = srm_device_interrupt;
 114
 115         mikasa_update_irq_hw(0);
 116
 117         for (i = 16; i < 32; ++i) {
 118                 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
 119                 irq_desc[i].chip = &mikasa_irq_type;
 120         }
 121
 122         init_i8259a_irqs();
 123         common_init_isa_dma();
 124 }
 125
 126
 127 /*
 128  * PCI Fixup configuration.
 129  *
 130  * Summary @ 0x536:
 131  * Bit      Meaning
 132  * 0        Interrupt Line A from slot 0
 133  * 1        Interrupt Line B from slot 0
 134  * 2        Interrupt Line C from slot 0
 135  * 3        Interrupt Line D from slot 0
 136  * 4        Interrupt Line A from slot 1
 137  * 5        Interrupt line B from slot 1
 138  * 6        Interrupt Line C from slot 1
 139  * 7        Interrupt Line D from slot 1
 140  * 8        Interrupt Line A from slot 2
 141  * 9        Interrupt Line B from slot 2
 142  *10        Interrupt Line C from slot 2
 143  *11        Interrupt Line D from slot 2
 144  *12        NCR 810 SCSI
 145  *13        Power Supply Fail
 146  *14        Temperature Warn
 147  *15        Reserved
 148  *
 149  * The device to slot mapping looks like:
 150  *
 151  * Slot     Device
 152  *  6       NCR SCSI controller
 153  *  7       Intel PCI-EISA bridge chip
 154  * 11       PCI on board slot 0
 155  * 12       PCI on board slot 1
 156  * 13       PCI on board slot 2
 157  *
 158  *
 159  * This two layered interrupt approach means that we allocate IRQ 16 and
 160  * above for PCI interrupts.  The IRQ relates to which bit the interrupt
 161  * comes in on.  This makes interrupt processing much easier.
 162  */
 163
 164 static int __init
 165 mikasa_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 166 {
 167         static char irq_tab[8][5] __initdata = {
 168                 /*INT    INTA   INTB   INTC   INTD */
 169                 {16+12, 16+12, 16+12, 16+12, 16+12},    /* IdSel 17,  SCSI */
 170                 {   -1,    -1,    -1,    -1,    -1},    /* IdSel 18,  PCEB */
 171                 {   -1,    -1,    -1,    -1,    -1},    /* IdSel 19,  ???? */
 172                 {   -1,    -1,    -1,    -1,    -1},    /* IdSel 20,  ???? */
 173                 {   -1,    -1,    -1,    -1,    -1},    /* IdSel 21,  ???? */
 174                 { 16+0,  16+0,  16+1,  16+2,  16+3},    /* IdSel 22,  slot 0 */
 175                 { 16+4,  16+4,  16+5,  16+6,  16+7},    /* IdSel 23,  slot 1 */
 176                 { 16+8,  16+8,  16+9, 16+10, 16+11},    /* IdSel 24,  slot 2 */
 177         };
 178         const long min_idsel = 6, max_idsel = 13, irqs_per_slot = 5;
 179         return COMMON_TABLE_LOOKUP;
 180 }
 181
 182
 183 #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
 184 static void
 185 mikasa_apecs_machine_check(unsigned long vector, unsigned long la_ptr)
 186 {
 187 #define MCHK_NO_DEVSEL 0x205U
 188 #define MCHK_NO_TABT 0x204U
 189
 190         struct el_common *mchk_header;
 191         unsigned int code;
 192
 193         mchk_header = (struct el_common *)la_ptr;
 194
 195         /* Clear the error before any reporting.  */
 196         mb();
 197         mb(); /* magic */
 198         draina();
 199         apecs_pci_clr_err();
 200         wrmces(0x7);
 201         mb();
 202
 203         code = mchk_header->code;
 204         process_mcheck_info(vector, la_ptr, "MIKASA APECS",
 205                             (mcheck_expected(0)
 206                              && (code == MCHK_NO_DEVSEL
 207                                  || code == MCHK_NO_TABT)));
 208 }
 209 #endif
 210
 211
 212 /*
 213  * The System Vector
 214  */
 215
 216 #if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
 217 struct alpha_machine_vector mikasa_mv __initmv = {
 218         .vector_name            = "Mikasa",
 219         DO_EV4_MMU,
 220         DO_DEFAULT_RTC,
 221         DO_APECS_IO,
 222         .machine_check          = mikasa_apecs_machine_check,
 223         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 224         .min_io_address         = DEFAULT_IO_BASE,
 225         .min_mem_address        = APECS_AND_LCA_DEFAULT_MEM_BASE,
 226
 227         .nr_irqs                = 32,
 228         .device_interrupt       = mikasa_device_interrupt,
 229
 230         .init_arch              = apecs_init_arch,
 231         .init_irq               = mikasa_init_irq,
 232         .init_rtc               = common_init_rtc,
 233         .init_pci               = common_init_pci,
 234         .pci_map_irq            = mikasa_map_irq,
 235         .pci_swizzle            = common_swizzle,
 236 };
 237 ALIAS_MV(mikasa)
 238 #endif
 239
 240 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
 241 struct alpha_machine_vector mikasa_primo_mv __initmv = {
 242         .vector_name            = "Mikasa-Primo",
 243         DO_EV5_MMU,
 244         DO_DEFAULT_RTC,
 245         DO_CIA_IO,
 246         .machine_check          = cia_machine_check,
 247         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 248         .min_io_address         = DEFAULT_IO_BASE,
 249         .min_mem_address        = CIA_DEFAULT_MEM_BASE,
 250
 251         .nr_irqs                = 32,
 252         .device_interrupt       = mikasa_device_interrupt,
 253
 254         .init_arch              = cia_init_arch,
 255         .init_irq               = mikasa_init_irq,
 256         .init_rtc               = common_init_rtc,
 257         .init_pci               = cia_init_pci,
 258         .kill_arch              = cia_kill_arch,
 259         .pci_map_irq            = mikasa_map_irq,
 260         .pci_swizzle            = common_swizzle,
 261 };
 262 ALIAS_MV(mikasa_primo)
 263 #endif