arch/alpha/kernel/sys_rawhide.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_rawhide.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 RAWHIDE.
   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
  18 #include <asm/ptrace.h>
  19 #include <asm/system.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_mcpcia.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 /*
  35  * HACK ALERT! only the boot cpu is used for interrupts.
  36  */
  37
  38
  39 /* Note mask bit is true for ENABLED irqs.  */
  40
  41 static unsigned int hose_irq_masks[4] = {
  42         0xff0000, 0xfe0000, 0xff0000, 0xff0000
  43 };
  44 static unsigned int cached_irq_masks[4];
  45 DEFINE_SPINLOCK(rawhide_irq_lock);
  46
  47 static inline void
  48 rawhide_update_irq_hw(int hose, int mask)
  49 {
  50         *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose)) = mask;
  51         mb();
  52         *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(hose));
  53 }
  54
  55 #define hose_exists(h) \
  56   (((h) < MCPCIA_MAX_HOSES) && (cached_irq_masks[(h)] != 0))
  57
  58 static inline void
  59 rawhide_enable_irq(unsigned int irq)
  60 {
  61         unsigned int mask, hose;
  62
  63         irq -= 16;
  64         hose = irq / 24;
  65         if (!hose_exists(hose)) /* if hose non-existent, exit */
  66                 return;
  67
  68         irq -= hose * 24;
  69         mask = 1 << irq;
  70
  71         spin_lock(&rawhide_irq_lock);
  72         mask |= cached_irq_masks[hose];
  73         cached_irq_masks[hose] = mask;
  74         rawhide_update_irq_hw(hose, mask);
  75         spin_unlock(&rawhide_irq_lock);
  76 }
  77
  78 static void
  79 rawhide_disable_irq(unsigned int irq)
  80 {
  81         unsigned int mask, hose;
  82
  83         irq -= 16;
  84         hose = irq / 24;
  85         if (!hose_exists(hose)) /* if hose non-existent, exit */
  86                 return;
  87
  88         irq -= hose * 24;
  89         mask = ~(1 << irq) | hose_irq_masks[hose];
  90
  91         spin_lock(&rawhide_irq_lock);
  92         mask &= cached_irq_masks[hose];
  93         cached_irq_masks[hose] = mask;
  94         rawhide_update_irq_hw(hose, mask);
  95         spin_unlock(&rawhide_irq_lock);
  96 }
  97
  98 static void
  99 rawhide_mask_and_ack_irq(unsigned int irq)
 100 {
 101         unsigned int mask, mask1, hose;
 102
 103         irq -= 16;
 104         hose = irq / 24;
 105         if (!hose_exists(hose)) /* if hose non-existent, exit */
 106                 return;
 107
 108         irq -= hose * 24;
 109         mask1 = 1 << irq;
 110         mask = ~mask1 | hose_irq_masks[hose];
 111
 112         spin_lock(&rawhide_irq_lock);
 113
 114         mask &= cached_irq_masks[hose];
 115         cached_irq_masks[hose] = mask;
 116         rawhide_update_irq_hw(hose, mask);
 117
 118         /* Clear the interrupt.  */
 119         *(vuip)MCPCIA_INT_REQ(MCPCIA_HOSE2MID(hose)) = mask1;
 120
 121         spin_unlock(&rawhide_irq_lock);
 122 }
 123
 124 static unsigned int
 125 rawhide_startup_irq(unsigned int irq)
 126 {
 127         rawhide_enable_irq(irq);
 128         return 0;
 129 }
 130
 131 static void
 132 rawhide_end_irq(unsigned int irq)
 133 {
 134         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 135                 rawhide_enable_irq(irq);
 136 }
 137
 138 static struct hw_interrupt_type rawhide_irq_type = {
 139         .typename       = "RAWHIDE",
 140         .startup        = rawhide_startup_irq,
 141         .shutdown       = rawhide_disable_irq,
 142         .enable         = rawhide_enable_irq,
 143         .disable        = rawhide_disable_irq,
 144         .ack            = rawhide_mask_and_ack_irq,
 145         .end            = rawhide_end_irq,
 146 };
 147
 148 static void
 149 rawhide_srm_device_interrupt(unsigned long vector)
 150 {
 151         int irq;
 152
 153         irq = (vector - 0x800) >> 4;
 154
 155         /*
 156          * The RAWHIDE SRM console reports PCI interrupts with a vector
 157          * 0x80 *higher* than one might expect, as PCI IRQ 0 (ie bit 0)
 158          * shows up as IRQ 24, etc, etc. We adjust it down by 8 to have
 159          * it line up with the actual bit numbers from the REQ registers,
 160          * which is how we manage the interrupts/mask. Sigh...
 161          *
 162          * Also, PCI #1 interrupts are offset some more... :-(
 163          */
 164
 165         if (irq == 52) {
 166                 /* SCSI on PCI1 is special.  */
 167                 irq = 72;
 168         }
 169
 170         /* Adjust by which hose it is from.  */
 171         irq -= ((irq + 16) >> 2) & 0x38;
 172
 173         handle_irq(irq);
 174 }
 175
 176 static void __init
 177 rawhide_init_irq(void)
 178 {
 179         struct pci_controller *hose;
 180         long i;
 181
 182         mcpcia_init_hoses();
 183
 184         /* Clear them all; only hoses that exist will be non-zero. */
 185         for (i = 0; i < MCPCIA_MAX_HOSES; i++) cached_irq_masks[i] = 0;
 186
 187         for (hose = hose_head; hose; hose = hose->next) {
 188                 unsigned int h = hose->index;
 189                 unsigned int mask = hose_irq_masks[h];
 190
 191                 cached_irq_masks[h] = mask;
 192                 *(vuip)MCPCIA_INT_MASK0(MCPCIA_HOSE2MID(h)) = mask;
 193                 *(vuip)MCPCIA_INT_MASK1(MCPCIA_HOSE2MID(h)) = 0;
 194         }
 195
 196         for (i = 16; i < 128; ++i) {
 197                 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
 198                 irq_desc[i].chip = &rawhide_irq_type;
 199         }
 200
 201         init_i8259a_irqs();
 202         common_init_isa_dma();
 203 }
 204
 205 /*
 206  * PCI Fixup configuration.
 207  *
 208  * Summary @ MCPCIA_PCI0_INT_REQ:
 209  * Bit      Meaning
 210  * 0        Interrupt Line A from slot 2 PCI0
 211  * 1        Interrupt Line B from slot 2 PCI0
 212  * 2        Interrupt Line C from slot 2 PCI0
 213  * 3        Interrupt Line D from slot 2 PCI0
 214  * 4        Interrupt Line A from slot 3 PCI0
 215  * 5        Interrupt Line B from slot 3 PCI0
 216  * 6        Interrupt Line C from slot 3 PCI0
 217  * 7        Interrupt Line D from slot 3 PCI0
 218  * 8        Interrupt Line A from slot 4 PCI0
 219  * 9        Interrupt Line B from slot 4 PCI0
 220  * 10       Interrupt Line C from slot 4 PCI0
 221  * 11       Interrupt Line D from slot 4 PCI0
 222  * 12       Interrupt Line A from slot 5 PCI0
 223  * 13       Interrupt Line B from slot 5 PCI0
 224  * 14       Interrupt Line C from slot 5 PCI0
 225  * 15       Interrupt Line D from slot 5 PCI0
 226  * 16       EISA interrupt (PCI 0) or SCSI interrupt (PCI 1)
 227  * 17-23    NA
 228  *
 229  * IdSel
 230  *   1   EISA bridge (PCI bus 0 only)
 231  *   2   PCI option slot 2
 232  *   3   PCI option slot 3
 233  *   4   PCI option slot 4
 234  *   5   PCI option slot 5
 235  *
 236  */
 237
 238 static int __init
 239 rawhide_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 240 {
 241         static char irq_tab[5][5] __initdata = {
 242                 /*INT    INTA   INTB   INTC   INTD */
 243                 { 16+16, 16+16, 16+16, 16+16, 16+16}, /* IdSel 1 SCSI PCI 1 */
 244                 { 16+ 0, 16+ 0, 16+ 1, 16+ 2, 16+ 3}, /* IdSel 2 slot 2 */
 245                 { 16+ 4, 16+ 4, 16+ 5, 16+ 6, 16+ 7}, /* IdSel 3 slot 3 */
 246                 { 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 4 slot 4 */
 247                 { 16+12, 16+12, 16+13, 16+14, 16+15}  /* IdSel 5 slot 5 */
 248         };
 249         const long min_idsel = 1, max_idsel = 5, irqs_per_slot = 5;
 250
 251         struct pci_controller *hose = dev->sysdata;
 252         int irq = COMMON_TABLE_LOOKUP;
 253         if (irq >= 0)
 254                 irq += 24 * hose->index;
 255         return irq;
 256 }
 257
 258
 259 /*
 260  * The System Vector
 261  */
 262
 263 struct alpha_machine_vector rawhide_mv __initmv = {
 264         .vector_name            = "Rawhide",
 265         DO_EV5_MMU,
 266         DO_DEFAULT_RTC,
 267         DO_MCPCIA_IO,
 268         .machine_check          = mcpcia_machine_check,
 269         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 270         .min_io_address         = DEFAULT_IO_BASE,
 271         .min_mem_address        = MCPCIA_DEFAULT_MEM_BASE,
 272         .pci_dac_offset         = MCPCIA_DAC_OFFSET,
 273
 274         .nr_irqs                = 128,
 275         .device_interrupt       = rawhide_srm_device_interrupt,
 276
 277         .init_arch              = mcpcia_init_arch,
 278         .init_irq               = rawhide_init_irq,
 279         .init_rtc               = common_init_rtc,
 280         .init_pci               = common_init_pci,
 281         .kill_arch              = NULL,
 282         .pci_map_irq            = rawhide_map_irq,
 283         .pci_swizzle            = common_swizzle,
 284 };
 285 ALIAS_MV(rawhide)