arch/alpha/kernel/sys_cabriolet.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_cabriolet.c
   3  *
   4  *      Copyright (C) 1995 David A Rusling
   5  *      Copyright (C) 1996 Jay A Estabrook
   6  *      Copyright (C) 1998, 1999, 2000 Richard Henderson
   7  *
   8  * Code supporting the Cabriolet (AlphaPC64), EB66+, and EB164,
   9  * PC164 and LX164.
  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/system.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/core_lca.h>
  30 #include <asm/tlbflush.h>
  31
  32 #include "proto.h"
  33 #include "irq_impl.h"
  34 #include "pci_impl.h"
  35 #include "machvec_impl.h"
  36 #include "pc873xx.h"
  37
  38 /* Note mask bit is true for DISABLED irqs.  */
  39 static unsigned long cached_irq_mask = ~0UL;
  40
  41 static inline void
  42 cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
  43 {
  44         int ofs = (irq - 16) / 8;
  45         outb(mask >> (16 + ofs * 8), 0x804 + ofs);
  46 }
  47
  48 static inline void
  49 cabriolet_enable_irq(struct irq_data *d)
  50 {
  51         cabriolet_update_irq_hw(d->irq, cached_irq_mask &= ~(1UL << d->irq));
  52 }
  53
  54 static void
  55 cabriolet_disable_irq(struct irq_data *d)
  56 {
  57         cabriolet_update_irq_hw(d->irq, cached_irq_mask |= 1UL << d->irq);
  58 }
  59
  60 static struct irq_chip cabriolet_irq_type = {
  61         .name           = "CABRIOLET",
  62         .irq_unmask     = cabriolet_enable_irq,
  63         .irq_mask       = cabriolet_disable_irq,
  64         .irq_mask_ack   = cabriolet_disable_irq,
  65 };
  66
  67 static void
  68 cabriolet_device_interrupt(unsigned long v)
  69 {
  70         unsigned long pld;
  71         unsigned int i;
  72
  73         /* Read the interrupt summary registers */
  74         pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
  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 == 4) {
  84                         isa_device_interrupt(v);
  85                 } else {
  86                         handle_irq(16 + i);
  87                 }
  88         }
  89 }
  90
  91 static void __init
  92 common_init_irq(void (*srm_dev_int)(unsigned long v))
  93 {
  94         init_i8259a_irqs();
  95
  96         if (alpha_using_srm) {
  97                 alpha_mv.device_interrupt = srm_dev_int;
  98                 init_srm_irqs(35, 0);
  99         }
 100         else {
 101                 long i;
 102
 103                 outb(0xff, 0x804);
 104                 outb(0xff, 0x805);
 105                 outb(0xff, 0x806);
 106
 107                 for (i = 16; i < 35; ++i) {
 108                         irq_set_chip_and_handler(i, &cabriolet_irq_type,
 109                                                  handle_level_irq);
 110                         irq_set_status_flags(i, IRQ_LEVEL);
 111                 }
 112         }
 113
 114         common_init_isa_dma();
 115         setup_irq(16+4, &isa_cascade_irqaction);
 116 }
 117
 118 #ifndef CONFIG_ALPHA_PC164
 119 static void __init
 120 cabriolet_init_irq(void)
 121 {
 122         common_init_irq(srm_device_interrupt);
 123 }
 124 #endif
 125
 126 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
 127 /* In theory, the PC164 has the same interrupt hardware as the other
 128    Cabriolet based systems.  However, something got screwed up late
 129    in the development cycle which broke the interrupt masking hardware.
 130    Repeat, it is not possible to mask and ack interrupts.  At all.
 131
 132    In an attempt to work around this, while processing interrupts,
 133    we do not allow the IPL to drop below what it is currently.  This
 134    prevents the possibility of recursion.
 135
 136    ??? Another option might be to force all PCI devices to use edge
 137    triggered rather than level triggered interrupts.  That might be
 138    too invasive though.  */
 139
 140 static void
 141 pc164_srm_device_interrupt(unsigned long v)
 142 {
 143         __min_ipl = getipl();
 144         srm_device_interrupt(v);
 145         __min_ipl = 0;
 146 }
 147
 148 static void
 149 pc164_device_interrupt(unsigned long v)
 150 {
 151         __min_ipl = getipl();
 152         cabriolet_device_interrupt(v);
 153         __min_ipl = 0;
 154 }
 155
 156 static void __init
 157 pc164_init_irq(void)
 158 {
 159         common_init_irq(pc164_srm_device_interrupt);
 160 }
 161 #endif
 162
 163 /*
 164  * The EB66+ is very similar to the EB66 except that it does not have
 165  * the on-board NCR and Tulip chips.  In the code below, I have used
 166  * slot number to refer to the id select line and *not* the slot
 167  * number used in the EB66+ documentation.  However, in the table,
 168  * I've given the slot number, the id select line and the Jxx number
 169  * that's printed on the board.  The interrupt pins from the PCI slots
 170  * are wired into 3 interrupt summary registers at 0x804, 0x805 and
 171  * 0x806 ISA.
 172  *
 173  * In the table, -1 means don't assign an IRQ number.  This is usually
 174  * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
 175  */
 176
 177 static inline int __init
 178 eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 179 {
 180         static char irq_tab[5][5] __initdata = {
 181                 /*INT  INTA  INTB  INTC   INTD */
 182                 {16+0, 16+0, 16+5,  16+9, 16+13},  /* IdSel 6,  slot 0, J25 */
 183                 {16+1, 16+1, 16+6, 16+10, 16+14},  /* IdSel 7,  slot 1, J26 */
 184                 {  -1,   -1,   -1,    -1,    -1},  /* IdSel 8,  SIO         */
 185                 {16+2, 16+2, 16+7, 16+11, 16+15},  /* IdSel 9,  slot 2, J27 */
 186                 {16+3, 16+3, 16+8, 16+12,  16+6}   /* IdSel 10, slot 3, J28 */
 187         };
 188         const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5;
 189         return COMMON_TABLE_LOOKUP;
 190 }
 191
 192
 193 /*
 194  * The AlphaPC64 is very similar to the EB66+ except that its slots
 195  * are numbered differently.  In the code below, I have used slot
 196  * number to refer to the id select line and *not* the slot number
 197  * used in the AlphaPC64 documentation.  However, in the table, I've
 198  * given the slot number, the id select line and the Jxx number that's
 199  * printed on the board.  The interrupt pins from the PCI slots are
 200  * wired into 3 interrupt summary registers at 0x804, 0x805 and 0x806
 201  * ISA.
 202  *
 203  * In the table, -1 means don't assign an IRQ number.  This is usually
 204  * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
 205  */
 206
 207 static inline int __init
 208 cabriolet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 209 {
 210         static char irq_tab[5][5] __initdata = {
 211                 /*INT   INTA  INTB  INTC   INTD */
 212                 { 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5,  slot 2, J21 */
 213                 { 16+0, 16+0, 16+5,  16+9, 16+13}, /* IdSel 6,  slot 0, J19 */
 214                 { 16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7,  slot 1, J20 */
 215                 {   -1,   -1,   -1,    -1,    -1}, /* IdSel 8,  SIO         */
 216                 { 16+3, 16+3, 16+8, 16+12, 16+16}  /* IdSel 9,  slot 3, J22 */
 217         };
 218         const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
 219         return COMMON_TABLE_LOOKUP;
 220 }
 221
 222 static inline void __init
 223 cabriolet_enable_ide(void)
 224 {
 225         if (pc873xx_probe() == -1) {
 226                 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
 227          } else {
 228                 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
 229                         pc873xx_get_model(), pc873xx_get_base());
 230
 231                 pc873xx_enable_ide();
 232         }
 233 }
 234
 235 static inline void __init
 236 cabriolet_init_pci(void)
 237 {
 238         common_init_pci();
 239         cabriolet_enable_ide();
 240 }
 241
 242 static inline void __init
 243 cia_cab_init_pci(void)
 244 {
 245         cia_init_pci();
 246         cabriolet_enable_ide();
 247 }
 248
 249 /*
 250  * The PC164 and LX164 have 19 PCI interrupts, four from each of the four
 251  * PCI slots, the SIO, PCI/IDE, and USB.
 252  *
 253  * Each of the interrupts can be individually masked. This is
 254  * accomplished by setting the appropriate bit in the mask register.
 255  * A bit is set by writing a "1" to the desired position in the mask
 256  * register and cleared by writing a "0". There are 3 mask registers
 257  * located at ISA address 804h, 805h and 806h.
 258  *
 259  * An I/O read at ISA address 804h, 805h, 806h will return the
 260  * state of the 11 PCI interrupts and not the state of the MASKED
 261  * interrupts.
 262  *
 263  * Note: A write to I/O 804h, 805h, and 806h the mask register will be
 264  * updated.
 265  *
 266  *
 267  *                              ISA DATA<7:0>
 268  * ISA     +--------------------------------------------------------------+
 269  * ADDRESS |   7   |   6   |   5   |   4   |   3   |   2  |   1   |   0   |
 270  *         +==============================================================+
 271  * 0x804   | INTB0 |  USB  |  IDE  |  SIO  | INTA3 |INTA2 | INTA1 | INTA0 |
 272  *         +--------------------------------------------------------------+
 273  * 0x805   | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 |
 274  *         +--------------------------------------------------------------+
 275  * 0x806   | Rsrv  | Rsrv  | Rsrv  | Rsrv  | Rsrv  |INTD3 | INTD2 | INTD1 |
 276  *         +--------------------------------------------------------------+
 277  *         * Rsrv = reserved bits
 278  *         Note: The mask register is write-only.
 279  *
 280  * IdSel
 281  *   5   32 bit PCI option slot 2
 282  *   6   64 bit PCI option slot 0
 283  *   7   64 bit PCI option slot 1
 284  *   8   Saturn I/O
 285  *   9   32 bit PCI option slot 3
 286  *  10   USB
 287  *  11   IDE
 288  *
 289  */
 290
 291 static inline int __init
 292 alphapc164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 293 {
 294         static char irq_tab[7][5] __initdata = {
 295                 /*INT   INTA  INTB   INTC   INTD */
 296                 { 16+2, 16+2, 16+9,  16+13, 16+17}, /* IdSel  5, slot 2, J20 */
 297                 { 16+0, 16+0, 16+7,  16+11, 16+15}, /* IdSel  6, slot 0, J29 */
 298                 { 16+1, 16+1, 16+8,  16+12, 16+16}, /* IdSel  7, slot 1, J26 */
 299                 {   -1,   -1,   -1,    -1,    -1},  /* IdSel  8, SIO */
 300                 { 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel  9, slot 3, J19 */
 301                 { 16+6, 16+6, 16+6,  16+6,  16+6},  /* IdSel 10, USB */
 302                 { 16+5, 16+5, 16+5,  16+5,  16+5}   /* IdSel 11, IDE */
 303         };
 304         const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
 305         return COMMON_TABLE_LOOKUP;
 306 }
 307
 308 static inline void __init
 309 alphapc164_init_pci(void)
 310 {
 311         cia_init_pci();
 312         SMC93x_Init();
 313 }
 314
 315
 316 /*
 317  * The System Vector
 318  */
 319
 320 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
 321 struct alpha_machine_vector cabriolet_mv __initmv = {
 322         .vector_name            = "Cabriolet",
 323         DO_EV4_MMU,
 324         DO_DEFAULT_RTC,
 325         DO_APECS_IO,
 326         .machine_check          = apecs_machine_check,
 327         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 328         .min_io_address         = DEFAULT_IO_BASE,
 329         .min_mem_address        = APECS_AND_LCA_DEFAULT_MEM_BASE,
 330
 331         .nr_irqs                = 35,
 332         .device_interrupt       = cabriolet_device_interrupt,
 333
 334         .init_arch              = apecs_init_arch,
 335         .init_irq               = cabriolet_init_irq,
 336         .init_rtc               = common_init_rtc,
 337         .init_pci               = cabriolet_init_pci,
 338         .pci_map_irq            = cabriolet_map_irq,
 339         .pci_swizzle            = common_swizzle,
 340 };
 341 #ifndef CONFIG_ALPHA_EB64P
 342 ALIAS_MV(cabriolet)
 343 #endif
 344 #endif
 345
 346 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164)
 347 struct alpha_machine_vector eb164_mv __initmv = {
 348         .vector_name            = "EB164",
 349         DO_EV5_MMU,
 350         DO_DEFAULT_RTC,
 351         DO_CIA_IO,
 352         .machine_check          = cia_machine_check,
 353         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 354         .min_io_address         = DEFAULT_IO_BASE,
 355         .min_mem_address        = CIA_DEFAULT_MEM_BASE,
 356
 357         .nr_irqs                = 35,
 358         .device_interrupt       = cabriolet_device_interrupt,
 359
 360         .init_arch              = cia_init_arch,
 361         .init_irq               = cabriolet_init_irq,
 362         .init_rtc               = common_init_rtc,
 363         .init_pci               = cia_cab_init_pci,
 364         .kill_arch              = cia_kill_arch,
 365         .pci_map_irq            = cabriolet_map_irq,
 366         .pci_swizzle            = common_swizzle,
 367 };
 368 ALIAS_MV(eb164)
 369 #endif
 370
 371 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P)
 372 struct alpha_machine_vector eb66p_mv __initmv = {
 373         .vector_name            = "EB66+",
 374         DO_EV4_MMU,
 375         DO_DEFAULT_RTC,
 376         DO_LCA_IO,
 377         .machine_check          = lca_machine_check,
 378         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 379         .min_io_address         = DEFAULT_IO_BASE,
 380         .min_mem_address        = APECS_AND_LCA_DEFAULT_MEM_BASE,
 381
 382         .nr_irqs                = 35,
 383         .device_interrupt       = cabriolet_device_interrupt,
 384
 385         .init_arch              = lca_init_arch,
 386         .init_irq               = cabriolet_init_irq,
 387         .init_rtc               = common_init_rtc,
 388         .init_pci               = cabriolet_init_pci,
 389         .pci_map_irq            = eb66p_map_irq,
 390         .pci_swizzle            = common_swizzle,
 391 };
 392 ALIAS_MV(eb66p)
 393 #endif
 394
 395 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
 396 struct alpha_machine_vector lx164_mv __initmv = {
 397         .vector_name            = "LX164",
 398         DO_EV5_MMU,
 399         DO_DEFAULT_RTC,
 400         DO_PYXIS_IO,
 401         .machine_check          = cia_machine_check,
 402         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 403         .min_io_address         = DEFAULT_IO_BASE,
 404         .min_mem_address        = DEFAULT_MEM_BASE,
 405         .pci_dac_offset         = PYXIS_DAC_OFFSET,
 406
 407         .nr_irqs                = 35,
 408         .device_interrupt       = cabriolet_device_interrupt,
 409
 410         .init_arch              = pyxis_init_arch,
 411         .init_irq               = cabriolet_init_irq,
 412         .init_rtc               = common_init_rtc,
 413         .init_pci               = alphapc164_init_pci,
 414         .kill_arch              = cia_kill_arch,
 415         .pci_map_irq            = alphapc164_map_irq,
 416         .pci_swizzle            = common_swizzle,
 417 };
 418 ALIAS_MV(lx164)
 419 #endif
 420
 421 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
 422 struct alpha_machine_vector pc164_mv __initmv = {
 423         .vector_name            = "PC164",
 424         DO_EV5_MMU,
 425         DO_DEFAULT_RTC,
 426         DO_CIA_IO,
 427         .machine_check          = cia_machine_check,
 428         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 429         .min_io_address         = DEFAULT_IO_BASE,
 430         .min_mem_address        = CIA_DEFAULT_MEM_BASE,
 431
 432         .nr_irqs                = 35,
 433         .device_interrupt       = pc164_device_interrupt,
 434
 435         .init_arch              = cia_init_arch,
 436         .init_irq               = pc164_init_irq,
 437         .init_rtc               = common_init_rtc,
 438         .init_pci               = alphapc164_init_pci,
 439         .kill_arch              = cia_kill_arch,
 440         .pci_map_irq            = alphapc164_map_irq,
 441         .pci_swizzle            = common_swizzle,
 442 };
 443 ALIAS_MV(pc164)
 444 #endif