i386/linux-2.3.21/arch/alpha/kernel/sys_sio.c

   1 /*
   2  *      linux/arch/alpha/kernel/sys_sio.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 for all boards that route the PCI interrupts through the SIO
   9  * PCI/ISA bridge.  This includes Noname (AXPpci33), Multia (UDB),
  10  * Kenetics's Platform 2000, Avanti (AlphaStation), XL, and AlphaBook1.
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/mm.h>
  17 #include <linux/sched.h>
  18 #include <linux/pci.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/compiler.h>
  22 #include <asm/ptrace.h>
  23 #include <asm/system.h>
  24 #include <asm/dma.h>
  25 #include <asm/irq.h>
  26 #include <asm/mmu_context.h>
  27 #include <asm/io.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/core_apecs.h>
  30 #include <asm/core_lca.h>
  31
  32 #include "proto.h"
  33 #include "irq_impl.h"
  34 #include "pci_impl.h"
  35 #include "machvec_impl.h"
  36
  37 static void
  38 sio_update_irq_hw(unsigned long irq, unsigned long mask, int unmask_p)
  39 {
  40         if (irq >= 8)
  41                 outb(mask >> 8, 0xA1);
  42         else
  43                 outb(mask, 0x21);
  44 }
  45
  46 static void __init
  47 sio_init_irq(void)
  48 {
  49         STANDARD_INIT_IRQ_PROLOG;
  50
  51         if (alpha_using_srm)
  52                 alpha_mv.device_interrupt = srm_device_interrupt;
  53
  54         enable_irq(2);                  /* enable cascade */
  55 }
  56
  57 static inline void __init
  58 xl_init_arch(unsigned long *mem_start, unsigned long *mem_end)
  59 {
  60         struct pci_controler *hose;
  61
  62         /*
  63          * Set up the PCI->physical memory translation windows.  For
  64          * the XL we *must* use both windows, in order to maximize the
  65          * amount of physical memory that can be used to DMA from the
  66          * ISA bus, and still allow PCI bus devices access to all of
  67          * host memory.
  68          *
  69          * See <asm/apecs.h> for window bases and sizes.
  70          *
  71          * This restriction due to the true XL motherboards' 82379AB SIO
  72          * PCI<->ISA bridge chip which passes only 27 bits of address...
  73          */
  74
  75         *(vuip)APECS_IOC_PB1R = 1<<19 | (APECS_XL_DMA_WIN1_BASE & 0xfff00000U);
  76         *(vuip)APECS_IOC_PM1R = (APECS_XL_DMA_WIN1_SIZE - 1) & 0xfff00000U;
  77         *(vuip)APECS_IOC_TB1R = 0;
  78
  79         *(vuip)APECS_IOC_PB2R = 1<<19 | (APECS_XL_DMA_WIN2_BASE & 0xfff00000U);
  80         *(vuip)APECS_IOC_PM2R = (APECS_XL_DMA_WIN2_SIZE - 1) & 0xfff00000U;
  81         *(vuip)APECS_IOC_TB2R = 0;
  82
  83         /*
  84          * Finally, clear the HAXR2 register, which gets used for PCI
  85          * Config Space accesses. That is the way we want to use it,
  86          * and we do not want to depend on what ARC or SRM might have
  87          * left behind...
  88          */
  89
  90         *(vuip)APECS_IOC_HAXR2 = 0; mb();
  91
  92         /*
  93          * Create our single hose.
  94          */
  95
  96         hose = alloc_pci_controler(mem_start);
  97         hose->io_space = &ioport_resource;
  98         hose->mem_space = &iomem_resource;
  99         hose->config_space = LCA_CONF;
 100         hose->index = 0;
 101 }
 102
 103 static inline void __init
 104 alphabook1_init_arch(unsigned long *mem_start, unsigned long *mem_end)
 105 {
 106         /* The AlphaBook1 has LCD video fixed at 800x600,
 107            37 rows and 100 cols. */
 108         screen_info.orig_y = 37;
 109         screen_info.orig_video_cols = 100;
 110         screen_info.orig_video_lines = 37;
 111
 112         lca_init_arch(mem_start, mem_end);
 113 }
 114
 115
 116 /*
 117  * sio_route_tab selects irq routing in PCI/ISA bridge so that:
 118  *              PIRQ0 -> irq 15
 119  *              PIRQ1 -> irq  9
 120  *              PIRQ2 -> irq 10
 121  *              PIRQ3 -> irq 11
 122  *
 123  * This probably ought to be configurable via MILO.  For
 124  * example, sound boards seem to like using IRQ 9.
 125  *
 126  * This is NOT how we should do it. PIRQ0-X should have
 127  * their own IRQ's, the way intel uses the IO-APIC irq's.
 128  */
 129
 130 static void __init
 131 sio_pci_route(void)
 132 {
 133         pcibios_write_config_dword(0, PCI_DEVFN(7, 0), 0x60,
 134                                    alpha_mv.sys.sio.route_tab);
 135 }
 136
 137 static unsigned int __init
 138 sio_collect_irq_levels(void)
 139 {
 140         unsigned int level_bits = 0;
 141         struct pci_dev *dev;
 142
 143         /* Iterate through the devices, collecting IRQ levels.  */
 144         for (dev = pci_devices; dev; dev = dev->next) {
 145                 if ((dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) &&
 146                     (dev->class >> 8 != PCI_CLASS_BRIDGE_PCMCIA))
 147                         continue;
 148
 149                 if (dev->irq)
 150                         level_bits |= (1 << dev->irq);
 151         }
 152         return level_bits;
 153 }
 154
 155 static void __init
 156 sio_fixup_irq_levels(unsigned int level_bits)
 157 {
 158         unsigned int old_level_bits;
 159
 160         /*
 161          * Now, make all PCI interrupts level sensitive.  Notice:
 162          * these registers must be accessed byte-wise.  inw()/outw()
 163          * don't work.
 164          *
 165          * Make sure to turn off any level bits set for IRQs 9,10,11,15,
 166          *  so that the only bits getting set are for devices actually found.
 167          * Note that we do preserve the remainder of the bits, which we hope
 168          *  will be set correctly by ARC/SRM.
 169          *
 170          * Note: we at least preserve any level-set bits on AlphaBook1
 171          */
 172         old_level_bits = inb(0x4d0) | (inb(0x4d1) << 8);
 173
 174         level_bits |= (old_level_bits & 0x71ff);
 175
 176         outb((level_bits >> 0) & 0xff, 0x4d0);
 177         outb((level_bits >> 8) & 0xff, 0x4d1);
 178 }
 179
 180 static inline int __init
 181 noname_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 182 {
 183         /*
 184          * The Noname board has 5 PCI slots with each of the 4
 185          * interrupt pins routed to different pins on the PCI/ISA
 186          * bridge (PIRQ0-PIRQ3).  The table below is based on
 187          * information available at:
 188          *
 189          *   http://ftp.digital.com/pub/DEC/axppci/ref_interrupts.txt
 190          *
 191          * I have no information on the Avanti interrupt routing, but
 192          * the routing seems to be identical to the Noname except
 193          * that the Avanti has an additional slot whose routing I'm
 194          * unsure of.
 195          *
 196          * pirq_tab[0] is a fake entry to deal with old PCI boards
 197          * that have the interrupt pin number hardwired to 0 (meaning
 198          * that they use the default INTA line, if they are interrupt
 199          * driven at all).
 200          */
 201         static char irq_tab[][5] __initlocaldata = {
 202                 /*INT A   B   C   D */
 203                 { 3,  3,  3,  3,  3}, /* idsel  6 (53c810) */
 204                 {-1, -1, -1, -1, -1}, /* idsel  7 (SIO: PCI/ISA bridge) */
 205                 { 2,  2, -1, -1, -1}, /* idsel  8 (Hack: slot closest ISA) */
 206                 {-1, -1, -1, -1, -1}, /* idsel  9 (unused) */
 207                 {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
 208                 { 0,  0,  2,  1,  0}, /* idsel 11 KN25_PCI_SLOT0 */
 209                 { 1,  1,  0,  2,  1}, /* idsel 12 KN25_PCI_SLOT1 */
 210                 { 2,  2,  1,  0,  2}, /* idsel 13 KN25_PCI_SLOT2 */
 211                 { 0,  0,  0,  0,  0}, /* idsel 14 AS255 TULIP */
 212         };
 213         const long min_idsel = 6, max_idsel = 14, irqs_per_slot = 5;
 214         int irq = COMMON_TABLE_LOOKUP, tmp;
 215         tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
 216         return irq >= 0 ? tmp : -1;
 217 }
 218
 219 static inline int __init
 220 p2k_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 221 {
 222         static char irq_tab[][5] __initlocaldata = {
 223                 /*INT A   B   C   D */
 224                 { 0,  0, -1, -1, -1}, /* idsel  6 (53c810) */
 225                 {-1, -1, -1, -1, -1}, /* idsel  7 (SIO: PCI/ISA bridge) */
 226                 { 1,  1,  2,  3,  0}, /* idsel  8 (slot A) */
 227                 { 2,  2,  3,  0,  1}, /* idsel  9 (slot B) */
 228                 {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
 229                 {-1, -1, -1, -1, -1}, /* idsel 11 (unused) */
 230                 { 3,  3, -1, -1, -1}, /* idsel 12 (CMD0646) */
 231         };
 232         const long min_idsel = 6, max_idsel = 12, irqs_per_slot = 5;
 233         int irq = COMMON_TABLE_LOOKUP, tmp;
 234         tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
 235         return irq >= 0 ? tmp : -1;
 236 }
 237
 238 static inline void __init
 239 noname_init_pci(void)
 240 {
 241         sio_pci_route();
 242         common_init_pci();
 243         sio_fixup_irq_levels(sio_collect_irq_levels());
 244         ns87312_enable_ide(0x26e);
 245 }
 246
 247 static inline void __init
 248 alphabook1_init_pci(void)
 249 {
 250         struct pci_dev *dev;
 251         unsigned char orig, config;
 252
 253         sio_pci_route();
 254         common_init_pci();
 255
 256         /*
 257          * On the AlphaBook1, the PCMCIA chip (Cirrus 6729)
 258          * is sensitive to PCI bus bursts, so we must DISABLE
 259          * burst mode for the NCR 8xx SCSI... :-(
 260          *
 261          * Note that the NCR810 SCSI driver must preserve the
 262          * setting of the bit in order for this to work.  At the
 263          * moment (2.0.29), ncr53c8xx.c does NOT do this, but
 264          * 53c7,8xx.c DOES.
 265          */
 266
 267         dev = NULL;
 268         while ((dev = pci_find_device(PCI_VENDOR_ID_NCR, PCI_ANY_ID, dev))) {
 269                 if (dev->device == PCI_DEVICE_ID_NCR_53C810
 270                     || dev->device == PCI_DEVICE_ID_NCR_53C815
 271                     || dev->device == PCI_DEVICE_ID_NCR_53C820
 272                     || dev->device == PCI_DEVICE_ID_NCR_53C825) {
 273                         unsigned long io_port;
 274                         unsigned char ctest4;
 275
 276                         io_port = dev->resource[0].start;
 277                         ctest4 = inb(io_port+0x21);
 278                         if (!(ctest4 & 0x80)) {
 279                                 printk("AlphaBook1 NCR init: setting"
 280                                        " burst disable\n");
 281                                 outb(ctest4 | 0x80, io_port+0x21);
 282                         }
 283                 }
 284         }
 285
 286         /* Do not set *ANY* level triggers for AlphaBook1. */
 287         sio_fixup_irq_levels(0);
 288
 289         /* Make sure that register PR1 indicates 1Mb mem */
 290         outb(0x0f, 0x3ce); orig = inb(0x3cf);   /* read PR5  */
 291         outb(0x0f, 0x3ce); outb(0x05, 0x3cf);   /* unlock PR0-4 */
 292         outb(0x0b, 0x3ce); config = inb(0x3cf); /* read PR1 */
 293         if ((config & 0xc0) != 0xc0) {
 294                 printk("AlphaBook1 VGA init: setting 1Mb memory\n");
 295                 config |= 0xc0;
 296                 outb(0x0b, 0x3ce); outb(config, 0x3cf); /* write PR1 */
 297         }
 298         outb(0x0f, 0x3ce); outb(orig, 0x3cf); /* (re)lock PR0-4 */
 299 }
 300
 301
 302 /*
 303  * The System Vectors
 304  */
 305
 306 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_BOOK1)
 307 struct alpha_machine_vector alphabook1_mv __initmv = {
 308         vector_name:            "AlphaBook1",
 309         DO_EV4_MMU,
 310         DO_DEFAULT_RTC,
 311         DO_LCA_IO,
 312         DO_LCA_BUS,
 313         machine_check:          lca_machine_check,
 314         max_dma_address:        ALPHA_MAX_DMA_ADDRESS,
 315         min_io_address:         DEFAULT_IO_BASE,
 316         min_mem_address:        APECS_AND_LCA_DEFAULT_MEM_BASE,
 317
 318         nr_irqs:                16,
 319         irq_probe_mask:         _PROBE_MASK(16),
 320         update_irq_hw:          sio_update_irq_hw,
 321         ack_irq:                common_ack_irq,
 322         device_interrupt:       isa_device_interrupt,
 323
 324         init_arch:              alphabook1_init_arch,
 325         init_irq:               sio_init_irq,
 326         init_pit:               common_init_pit,
 327         init_pci:               alphabook1_init_pci,
 328         kill_arch:              common_kill_arch,
 329         pci_map_irq:            noname_map_irq,
 330         pci_swizzle:            common_swizzle,
 331
 332         sys: { sio: {
 333                 /* NCR810 SCSI is 14, PCMCIA controller is 15.  */
 334                 route_tab:      0x0e0f0a0a,
 335         }}
 336 };
 337 ALIAS_MV(alphabook1)
 338 #endif
 339
 340 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_AVANTI)
 341 struct alpha_machine_vector avanti_mv __initmv = {
 342         vector_name:            "Avanti",
 343         DO_EV4_MMU,
 344         DO_DEFAULT_RTC,
 345         DO_APECS_IO,
 346         DO_APECS_BUS,
 347         machine_check:          apecs_machine_check,
 348         max_dma_address:        ALPHA_MAX_DMA_ADDRESS,
 349         min_io_address:         DEFAULT_IO_BASE,
 350         min_mem_address:        APECS_AND_LCA_DEFAULT_MEM_BASE,
 351
 352         nr_irqs:                16,
 353         irq_probe_mask:         _PROBE_MASK(16),
 354         update_irq_hw:          sio_update_irq_hw,
 355         ack_irq:                common_ack_irq,
 356         device_interrupt:       isa_device_interrupt,
 357
 358         init_arch:              apecs_init_arch,
 359         init_irq:               sio_init_irq,
 360         init_pit:               common_init_pit,
 361         init_pci:               noname_init_pci,
 362         kill_arch:              common_kill_arch,
 363         pci_map_irq:            noname_map_irq,
 364         pci_swizzle:            common_swizzle,
 365
 366         sys: { sio: {
 367                 route_tab:      0x0b0a0e0f,
 368         }}
 369 };
 370 ALIAS_MV(avanti)
 371 #endif
 372
 373 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_NONAME)
 374 struct alpha_machine_vector noname_mv __initmv = {
 375         vector_name:            "Noname",
 376         DO_EV4_MMU,
 377         DO_DEFAULT_RTC,
 378         DO_LCA_IO,
 379         DO_LCA_BUS,
 380         machine_check:          lca_machine_check,
 381         max_dma_address:        ALPHA_MAX_DMA_ADDRESS,
 382         min_io_address:         DEFAULT_IO_BASE,
 383         min_mem_address:        APECS_AND_LCA_DEFAULT_MEM_BASE,
 384
 385         nr_irqs:                16,
 386         irq_probe_mask:         _PROBE_MASK(16),
 387         update_irq_hw:          sio_update_irq_hw,
 388         ack_irq:                common_ack_irq,
 389         device_interrupt:       srm_device_interrupt,
 390
 391         init_arch:              lca_init_arch,
 392         init_irq:               sio_init_irq,
 393         init_pit:               common_init_pit,
 394         init_pci:               noname_init_pci,
 395         kill_arch:              common_kill_arch,
 396         pci_map_irq:            noname_map_irq,
 397         pci_swizzle:            common_swizzle,
 398
 399         sys: { sio: {
 400                 /* For UDB, the only available PCI slot must not map to IRQ 9,
 401                    since that's the builtin MSS sound chip. That PCI slot
 402                    will map to PIRQ1 (for INTA at least), so we give it IRQ 15
 403                    instead.
 404
 405                    Unfortunately we have to do this for NONAME as well, since
 406                    they are co-indicated when the platform type "Noname" is
 407                    selected... :-(  */
 408
 409                 route_tab:      0x0b0a0f0d,
 410         }}
 411 };
 412 ALIAS_MV(noname)
 413 #endif
 414
 415 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_P2K)
 416 struct alpha_machine_vector p2k_mv __initmv = {
 417         vector_name:            "Platform2000",
 418         DO_EV4_MMU,
 419         DO_DEFAULT_RTC,
 420         DO_LCA_IO,
 421         DO_LCA_BUS,
 422         machine_check:          lca_machine_check,
 423         max_dma_address:        ALPHA_MAX_DMA_ADDRESS,
 424         min_io_address:         DEFAULT_IO_BASE,
 425         min_mem_address:        APECS_AND_LCA_DEFAULT_MEM_BASE,
 426
 427         nr_irqs:                16,
 428         irq_probe_mask:         P2K_PROBE_MASK,
 429         update_irq_hw:          sio_update_irq_hw,
 430         ack_irq:                common_ack_irq,
 431         device_interrupt:       srm_device_interrupt,
 432
 433         init_arch:              lca_init_arch,
 434         init_irq:               sio_init_irq,
 435         init_pit:               common_init_pit,
 436         init_pci:               noname_init_pci,
 437         kill_arch:              common_kill_arch,
 438         pci_map_irq:            p2k_map_irq,
 439         pci_swizzle:            common_swizzle,
 440
 441         sys: { sio: {
 442                 route_tab:      0x0b0a090f,
 443         }}
 444 };
 445 ALIAS_MV(p2k)
 446 #endif
 447
 448 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_XL)
 449 struct alpha_machine_vector xl_mv __initmv = {
 450         vector_name:            "XL",
 451         DO_EV4_MMU,
 452         DO_DEFAULT_RTC,
 453         DO_APECS_IO,
 454         BUS(apecs_xl),
 455         machine_check:          apecs_machine_check,
 456         max_dma_address:        ALPHA_XL_MAX_DMA_ADDRESS,
 457         min_io_address:         DEFAULT_IO_BASE,
 458         min_mem_address:        XL_DEFAULT_MEM_BASE,
 459
 460         nr_irqs:                16,
 461         irq_probe_mask:         _PROBE_MASK(16),
 462         update_irq_hw:          sio_update_irq_hw,
 463         ack_irq:                common_ack_irq,
 464         device_interrupt:       isa_device_interrupt,
 465
 466         init_arch:              xl_init_arch,
 467         init_irq:               sio_init_irq,
 468         init_pit:               common_init_pit,
 469         init_pci:               noname_init_pci,
 470         kill_arch:              common_kill_arch,
 471         pci_map_irq:            noname_map_irq,
 472         pci_swizzle:            common_swizzle,
 473
 474         sys: { sio: {
 475                 route_tab:      0x0b0a090f,
 476         }}
 477 };
 478 ALIAS_MV(xl)
 479 #endif