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