arch/alpha/kernel/sys_takara.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_takara.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 TAKARA.
   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_cia.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 /* Note mask bit is true for DISABLED irqs.  */
  35 static unsigned long cached_irq_mask[2] = { -1, -1 };
  36
  37 static inline void
  38 takara_update_irq_hw(unsigned long irq, unsigned long mask)
  39 {
  40         int regaddr;
  41
  42         mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
  43         regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
  44         outl(mask & 0xffff0000UL, regaddr);
  45 }
  46
  47 static inline void
  48 takara_enable_irq(unsigned int irq)
  49 {
  50         unsigned long mask;
  51         mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
  52         takara_update_irq_hw(irq, mask);
  53 }
  54
  55 static void
  56 takara_disable_irq(unsigned int irq)
  57 {
  58         unsigned long mask;
  59         mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
  60         takara_update_irq_hw(irq, mask);
  61 }
  62
  63 static unsigned int
  64 takara_startup_irq(unsigned int irq)
  65 {
  66         takara_enable_irq(irq);
  67         return 0; /* never anything pending */
  68 }
  69
  70 static void
  71 takara_end_irq(unsigned int irq)
  72 {
  73         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
  74                 takara_enable_irq(irq);
  75 }
  76
  77 static struct hw_interrupt_type takara_irq_type = {
  78         .typename       = "TAKARA",
  79         .startup        = takara_startup_irq,
  80         .shutdown       = takara_disable_irq,
  81         .enable         = takara_enable_irq,
  82         .disable        = takara_disable_irq,
  83         .ack            = takara_disable_irq,
  84         .end            = takara_end_irq,
  85 };
  86
  87 static void
  88 takara_device_interrupt(unsigned long vector, struct pt_regs *regs)
  89 {
  90         unsigned intstatus;
  91
  92         /*
  93          * The PALcode will have passed us vectors 0x800 or 0x810,
  94          * which are fairly arbitrary values and serve only to tell
  95          * us whether an interrupt has come in on IRQ0 or IRQ1. If
  96          * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
  97          * probably ISA, but PCI interrupts can come through IRQ0
  98          * as well if the interrupt controller isn't in accelerated
  99          * mode.
 100          *
 101          * OTOH, the accelerator thing doesn't seem to be working
 102          * overly well, so what we'll do instead is try directly
 103          * examining the Master Interrupt Register to see if it's a
 104          * PCI interrupt, and if _not_ then we'll pass it on to the
 105          * ISA handler.
 106          */
 107
 108         intstatus = inw(0x500) & 15;
 109         if (intstatus) {
 110                 /*
 111                  * This is a PCI interrupt. Check each bit and
 112                  * despatch an interrupt if it's set.
 113                  */
 114
 115                 if (intstatus & 8) handle_irq(16+3, regs);
 116                 if (intstatus & 4) handle_irq(16+2, regs);
 117                 if (intstatus & 2) handle_irq(16+1, regs);
 118                 if (intstatus & 1) handle_irq(16+0, regs);
 119         } else {
 120                 isa_device_interrupt (vector, regs);
 121         }
 122 }
 123
 124 static void
 125 takara_srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
 126 {
 127         int irq = (vector - 0x800) >> 4;
 128         handle_irq(irq, regs);
 129 }
 130
 131 static void __init
 132 takara_init_irq(void)
 133 {
 134         long i;
 135
 136         init_i8259a_irqs();
 137
 138         if (alpha_using_srm) {
 139                 alpha_mv.device_interrupt = takara_srm_device_interrupt;
 140         } else {
 141                 unsigned int ctlreg = inl(0x500);
 142
 143                 /* Return to non-accelerated mode.  */
 144                 ctlreg &= ~0x8000;
 145                 outl(ctlreg, 0x500);
 146
 147                 /* Enable the PCI interrupt register.  */
 148                 ctlreg = 0x05107c00;
 149                 outl(ctlreg, 0x500);
 150         }
 151
 152         for (i = 16; i < 128; i += 16)
 153                 takara_update_irq_hw(i, -1);
 154
 155         for (i = 16; i < 128; ++i) {
 156                 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
 157                 irq_desc[i].handler = &takara_irq_type;
 158         }
 159
 160         common_init_isa_dma();
 161 }
 162
 163
 164 /*
 165  * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
 166  * 19, and 18 respectively, in the default configuration. They can
 167  * also be jumpered to slots 8, 7, and 6 respectively, which is fun
 168  * because the SIO ISA bridge can also be slot 7. However, the SIO
 169  * doesn't explicitly generate PCI-type interrupts, so we can
 170  * assign it whatever the hell IRQ we like and it doesn't matter.
 171  */
 172
 173 static int __init
 174 takara_map_irq_srm(struct pci_dev *dev, u8 slot, u8 pin)
 175 {
 176         static char irq_tab[15][5] __initdata = {
 177                 { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
 178                 { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
 179                 { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
 180                 {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
 181                 {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
 182                 {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
 183                 /* These are behind the bridges.  */
 184                 {   12,   12,   13,   14,   15},   /* slot 12 == nothing */
 185                 {    8,    8,    9,   19,   11},   /* slot 13 == nothing */
 186                 {    4,    4,    5,    6,    7},   /* slot 14 == nothing */
 187                 {    0,    0,    1,    2,    3},   /* slot 15 == nothing */
 188                 {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
 189                 {64+ 0, 64+0, 64+1, 64+2, 64+3},   /* slot 17= device 4 */
 190                 {48+ 0, 48+0, 48+1, 48+2, 48+3},   /* slot 18= device 3 */
 191                 {32+ 0, 32+0, 32+1, 32+2, 32+3},   /* slot 19= device 2 */
 192                 {16+ 0, 16+0, 16+1, 16+2, 16+3},   /* slot 20= device 1 */
 193         };
 194         const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
 195         int irq = COMMON_TABLE_LOOKUP;
 196         if (irq >= 0 && irq < 16) {
 197                 /* Guess that we are behind a bridge.  */
 198                 unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
 199                 irq += irq_tab[busslot-min_idsel][0];
 200         }
 201         return irq;
 202 }
 203
 204 static int __init
 205 takara_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 206 {
 207         static char irq_tab[15][5] __initdata = {
 208                 { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
 209                 { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
 210                 { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
 211                 {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
 212                 {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
 213                 {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
 214                 {   -1,   -1,   -1,   -1,   -1},   /* slot 12 == nothing */
 215                 {   -1,   -1,   -1,   -1,   -1},   /* slot 13 == nothing */
 216                 {   -1,   -1,   -1,   -1,   -1},   /* slot 14 == nothing */
 217                 {   -1,   -1,   -1,   -1,   -1},   /* slot 15 == nothing */
 218                 {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
 219                 {   -1,   -1,   -1,   -1,   -1},   /* slot 17 == nothing */
 220                 { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot 18 == device 3 */
 221                 { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot 19 == device 2 */
 222                 { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot 20 == device 1 */
 223         };
 224         const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
 225         return COMMON_TABLE_LOOKUP;
 226 }
 227
 228 static u8 __init
 229 takara_swizzle(struct pci_dev *dev, u8 *pinp)
 230 {
 231         int slot = PCI_SLOT(dev->devfn);
 232         int pin = *pinp;
 233         unsigned int ctlreg = inl(0x500);
 234         unsigned int busslot;
 235
 236         if (!dev->bus->self)
 237                 return slot;
 238
 239         busslot = PCI_SLOT(dev->bus->self->devfn);
 240         /* Check for built-in bridges.  */
 241         if (dev->bus->number != 0
 242             && busslot > 16
 243             && ((1<<(36-busslot)) & ctlreg)) {
 244                 if (pin == 1)
 245                         pin += (20 - busslot);
 246                 else {
 247                         printk(KERN_WARNING "takara_swizzle: can only "
 248                                "handle cards with INTA IRQ pin.\n");
 249                 }
 250         } else {
 251                 /* Must be a card-based bridge.  */
 252                 printk(KERN_WARNING "takara_swizzle: cannot handle "
 253                        "card-bridge behind builtin bridge yet.\n");
 254         }
 255
 256         *pinp = pin;
 257         return slot;
 258 }
 259
 260 static void __init
 261 takara_init_pci(void)
 262 {
 263         if (alpha_using_srm)
 264                 alpha_mv.pci_map_irq = takara_map_irq_srm;
 265
 266         cia_init_pci();
 267         ns87312_enable_ide(0x26e);
 268 }
 269
 270
 271 /*
 272  * The System Vector
 273  */
 274
 275 struct alpha_machine_vector takara_mv __initmv = {
 276         .vector_name            = "Takara",
 277         DO_EV5_MMU,
 278         DO_DEFAULT_RTC,
 279         DO_CIA_IO,
 280         .machine_check          = cia_machine_check,
 281         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 282         .min_io_address         = DEFAULT_IO_BASE,
 283         .min_mem_address        = CIA_DEFAULT_MEM_BASE,
 284
 285         .nr_irqs                = 128,
 286         .device_interrupt       = takara_device_interrupt,
 287
 288         .init_arch              = cia_init_arch,
 289         .init_irq               = takara_init_irq,
 290         .init_rtc               = common_init_rtc,
 291         .init_pci               = takara_init_pci,
 292         .kill_arch              = cia_kill_arch,
 293         .pci_map_irq            = takara_map_irq,
 294         .pci_swizzle            = takara_swizzle,
 295 };
 296 ALIAS_MV(takara)