drivers/parisc/superio.c

   1 /*      National Semiconductor NS87560UBD Super I/O controller used in
   2  *      HP [BCJ]x000 workstations.
   3  *
   4  *      This chip is a horrid piece of engineering, and National
   5  *      denies any knowledge of its existence. Thus no datasheet is
   6  *      available off www.national.com.
   7  *
   8  *      (C) Copyright 2000 Linuxcare, Inc.
   9  *      (C) Copyright 2000 Linuxcare Canada, Inc.
  10  *      (C) Copyright 2000 Martin K. Petersen <mkp@linuxcare.com>
  11  *      (C) Copyright 2000 Alex deVries <alex@onefishtwo.ca>
  12  *      (C) Copyright 2001 John Marvin <jsm fc hp com>
  13  *      (C) Copyright 2003 Grant Grundler <grundler parisc-linux org>
  14  *      (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
  15  *      (C) Copyright 2006 Helge Deller <deller@gmx.de>
  16  *
  17  *      This program is free software; you can redistribute it and/or
  18  *      modify it under the terms of the GNU General Public License as
  19  *      published by the Free Software Foundation; either version 2 of
  20  *      the License, or (at your option) any later version.
  21  *
  22  *      The initial version of this is by Martin Peterson.  Alex deVries
  23  *      has spent a bit of time trying to coax it into working.
  24  *
  25  *      Major changes to get basic interrupt infrastructure working to
  26  *      hopefully be able to support all SuperIO devices. Currently
  27  *      works with serial. -- John Marvin <jsm@fc.hp.com>
  28  *
  29  *      Converted superio_init() to be a PCI_FIXUP_FINAL callee.
  30  *         -- Kyle McMartin <kyle@parisc-linux.org>
  31  */
  32
  33
  34 /* NOTES:
  35  *
  36  * Function 0 is an IDE controller. It is identical to a PC87415 IDE
  37  * controller (and identifies itself as such).
  38  *
  39  * Function 1 is a "Legacy I/O" controller. Under this function is a
  40  * whole mess of legacy I/O peripherals. Of course, HP hasn't enabled
  41  * all the functionality in hardware, but the following is available:
  42  *
  43  *      Two 16550A compatible serial controllers
  44  *      An IEEE 1284 compatible parallel port
  45  *      A floppy disk controller
  46  *
  47  * Function 2 is a USB controller.
  48  *
  49  * We must be incredibly careful during initialization.  Since all
  50  * interrupts are routed through function 1 (which is not allowed by
  51  * the PCI spec), we need to program the PICs on the legacy I/O port
  52  * *before* we attempt to set up IDE and USB.  @#$!&
  53  *
  54  * According to HP, devices are only enabled by firmware if they have
  55  * a physical device connected.
  56  *
  57  * Configuration register bits:
  58  *     0x5A: FDC, SP1, IDE1, SP2, IDE2, PAR, Reserved, P92
  59  *     0x5B: RTC, 8259, 8254, DMA1, DMA2, KBC, P61, APM
  60  *
  61  */
  62
  63 #include <linux/errno.h>
  64 #include <linux/init.h>
  65 #include <linux/module.h>
  66 #include <linux/types.h>
  67 #include <linux/interrupt.h>
  68 #include <linux/ioport.h>
  69 #include <linux/serial.h>
  70 #include <linux/pci.h>
  71 #include <linux/parport.h>
  72 #include <linux/parport_pc.h>
  73 #include <linux/termios.h>
  74 #include <linux/tty.h>
  75 #include <linux/serial_core.h>
  76 #include <linux/serial_8250.h>
  77 #include <linux/delay.h>
  78
  79 #include <asm/io.h>
  80 #include <asm/hardware.h>
  81 #include <asm/superio.h>
  82
  83 static struct superio_device sio_dev;
  84
  85
  86 #undef DEBUG_SUPERIO_INIT
  87
  88 #ifdef DEBUG_SUPERIO_INIT
  89 #define DBG_INIT(x...)  printk(x)
  90 #else
  91 #define DBG_INIT(x...)
  92 #endif
  93
  94 #define SUPERIO "SuperIO"
  95 #define PFX     SUPERIO ": "
  96
  97 static irqreturn_t
  98 superio_interrupt(int parent_irq, void *devp)
  99 {
 100         u8 results;
 101         u8 local_irq;
 102
 103         /* Poll the 8259 to see if there's an interrupt. */
 104         outb (OCW3_POLL,IC_PIC1+0);
 105
 106         results = inb(IC_PIC1+0);
 107
 108         /*
 109          * Bit    7:    1 = active Interrupt; 0 = no Interrupt pending
 110          * Bits 6-3:    zero
 111          * Bits 2-0:    highest priority, active requesting interrupt ID (0-7)
 112          */
 113         if ((results & 0x80) == 0) {
 114                 /* I suspect "spurious" interrupts are from unmasking an IRQ.
 115                  * We don't know if an interrupt was/is pending and thus
 116                  * just call the handler for that IRQ as if it were pending.
 117                  */
 118                 return IRQ_NONE;
 119         }
 120
 121         /* Check to see which device is interrupting */
 122         local_irq = results & 0x0f;
 123
 124         if (local_irq == 2 || local_irq > 7) {
 125                 printk(KERN_ERR PFX "slave interrupted!\n");
 126                 return IRQ_HANDLED;
 127         }
 128
 129         if (local_irq == 7) {
 130
 131                 /* Could be spurious. Check in service bits */
 132
 133                 outb(OCW3_ISR,IC_PIC1+0);
 134                 results = inb(IC_PIC1+0);
 135                 if ((results & 0x80) == 0) { /* if ISR7 not set: spurious */
 136                         printk(KERN_WARNING PFX "spurious interrupt!\n");
 137                         return IRQ_HANDLED;
 138                 }
 139         }
 140
 141         /* Call the appropriate device's interrupt */
 142         __do_IRQ(local_irq);
 143
 144         /* set EOI - forces a new interrupt if a lower priority device
 145          * still needs service.
 146          */
 147         outb((OCW2_SEOI|local_irq),IC_PIC1 + 0);
 148         return IRQ_HANDLED;
 149 }
 150
 151 /* Initialize Super I/O device */
 152 static void
 153 superio_init(struct pci_dev *pcidev)
 154 {
 155         struct superio_device *sio = &sio_dev;
 156         struct pci_dev *pdev = sio->lio_pdev;
 157         u16 word;
 158         int ret;
 159
 160         if (sio->suckyio_irq_enabled)
 161                 return;
 162
 163         BUG_ON(!pdev);
 164         BUG_ON(!sio->usb_pdev);
 165
 166         /* use the IRQ iosapic found for USB INT D... */
 167         pdev->irq = sio->usb_pdev->irq;
 168
 169         /* ...then properly fixup the USB to point at suckyio PIC */
 170         sio->usb_pdev->irq = superio_fixup_irq(sio->usb_pdev);
 171
 172         printk(KERN_INFO PFX "Found NS87560 Legacy I/O device at %s (IRQ %i)\n",
 173                pci_name(pdev), pdev->irq);
 174
 175         pci_read_config_dword (pdev, SIO_SP1BAR, &sio->sp1_base);
 176         sio->sp1_base &= ~1;
 177         printk(KERN_INFO PFX "Serial port 1 at 0x%x\n", sio->sp1_base);
 178
 179         pci_read_config_dword (pdev, SIO_SP2BAR, &sio->sp2_base);
 180         sio->sp2_base &= ~1;
 181         printk(KERN_INFO PFX "Serial port 2 at 0x%x\n", sio->sp2_base);
 182
 183         pci_read_config_dword (pdev, SIO_PPBAR, &sio->pp_base);
 184         sio->pp_base &= ~1;
 185         printk(KERN_INFO PFX "Parallel port at 0x%x\n", sio->pp_base);
 186
 187         pci_read_config_dword (pdev, SIO_FDCBAR, &sio->fdc_base);
 188         sio->fdc_base &= ~1;
 189         printk(KERN_INFO PFX "Floppy controller at 0x%x\n", sio->fdc_base);
 190         pci_read_config_dword (pdev, SIO_ACPIBAR, &sio->acpi_base);
 191         sio->acpi_base &= ~1;
 192         printk(KERN_INFO PFX "ACPI at 0x%x\n", sio->acpi_base);
 193
 194         request_region (IC_PIC1, 0x1f, "pic1");
 195         request_region (IC_PIC2, 0x1f, "pic2");
 196         request_region (sio->acpi_base, 0x1f, "acpi");
 197
 198         /* Enable the legacy I/O function */
 199         pci_read_config_word (pdev, PCI_COMMAND, &word);
 200         word |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_IO;
 201         pci_write_config_word (pdev, PCI_COMMAND, word);
 202
 203         pci_set_master (pdev);
 204         ret = pci_enable_device(pdev);
 205         BUG_ON(ret < 0);        /* not too much we can do about this... */
 206
 207         /*
 208          * Next project is programming the onboard interrupt controllers.
 209          * PDC hasn't done this for us, since it's using polled I/O.
 210          *
 211          * XXX Use dword writes to avoid bugs in Elroy or Suckyio Config
 212          *     space access.  PCI is by nature a 32-bit bus and config
 213          *     space can be sensitive to that.
 214          */
 215
 216         /* 0x64 - 0x67 :
 217                 DMA Rtg 2
 218                 DMA Rtg 3
 219                 DMA Chan Ctl
 220                 TRIGGER_1    == 0x82   USB & IDE level triggered, rest to edge
 221         */
 222         pci_write_config_dword (pdev, 0x64,         0x82000000U);
 223
 224         /* 0x68 - 0x6b :
 225                 TRIGGER_2    == 0x00   all edge triggered (not used)
 226                 CFG_IR_SER   == 0x43   SerPort1 = IRQ3, SerPort2 = IRQ4
 227                 CFG_IR_PF    == 0x65   ParPort  = IRQ5, FloppyCtlr = IRQ6
 228                 CFG_IR_IDE   == 0x07   IDE1 = IRQ7, reserved
 229         */
 230         pci_write_config_dword (pdev, TRIGGER_2,    0x07654300U);
 231
 232         /* 0x6c - 0x6f :
 233                 CFG_IR_INTAB == 0x00
 234                 CFG_IR_INTCD == 0x10   USB = IRQ1
 235                 CFG_IR_PS2   == 0x00
 236                 CFG_IR_FXBUS == 0x00
 237         */
 238         pci_write_config_dword (pdev, CFG_IR_INTAB, 0x00001000U);
 239
 240         /* 0x70 - 0x73 :
 241                 CFG_IR_USB   == 0x00  not used. USB is connected to INTD.
 242                 CFG_IR_ACPI  == 0x00  not used.
 243                 DMA Priority == 0x4c88  Power on default value. NFC.
 244         */
 245         pci_write_config_dword (pdev, CFG_IR_USB, 0x4c880000U);
 246
 247         /* PIC1 Initialization Command Word register programming */
 248         outb (0x11,IC_PIC1+0);  /* ICW1: ICW4 write req | ICW1 */
 249         outb (0x00,IC_PIC1+1);  /* ICW2: interrupt vector table - not used */
 250         outb (0x04,IC_PIC1+1);  /* ICW3: Cascade */
 251         outb (0x01,IC_PIC1+1);  /* ICW4: x86 mode */
 252
 253         /* PIC1 Program Operational Control Words */
 254         outb (0xff,IC_PIC1+1);  /* OCW1: Mask all interrupts */
 255         outb (0xc2,IC_PIC1+0);  /* OCW2: priority (3-7,0-2) */
 256
 257         /* PIC2 Initialization Command Word register programming */
 258         outb (0x11,IC_PIC2+0);  /* ICW1: ICW4 write req | ICW1 */
 259         outb (0x00,IC_PIC2+1);  /* ICW2: N/A */
 260         outb (0x02,IC_PIC2+1);  /* ICW3: Slave ID code */
 261         outb (0x01,IC_PIC2+1);  /* ICW4: x86 mode */
 262
 263         /* Program Operational Control Words */
 264         outb (0xff,IC_PIC1+1);  /* OCW1: Mask all interrupts */
 265         outb (0x68,IC_PIC1+0);  /* OCW3: OCW3 select | ESMM | SMM */
 266
 267         /* Write master mask reg */
 268         outb (0xff,IC_PIC1+1);
 269
 270         /* Setup USB power regulation */
 271         outb(1, sio->acpi_base + USB_REG_CR);
 272         if (inb(sio->acpi_base + USB_REG_CR) & 1)
 273                 printk(KERN_INFO PFX "USB regulator enabled\n");
 274         else
 275                 printk(KERN_ERR PFX "USB regulator not initialized!\n");
 276
 277         if (request_irq(pdev->irq, superio_interrupt, IRQF_DISABLED,
 278                         SUPERIO, (void *)sio)) {
 279
 280                 printk(KERN_ERR PFX "could not get irq\n");
 281                 BUG();
 282                 return;
 283         }
 284
 285         sio->suckyio_irq_enabled = 1;
 286 }
 287 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO, superio_init);
 288
 289 static void superio_disable_irq(unsigned int irq)
 290 {
 291         u8 r8;
 292
 293         if ((irq < 1) || (irq == 2) || (irq > 7)) {
 294                 printk(KERN_ERR PFX "Illegal irq number.\n");
 295                 BUG();
 296                 return;
 297         }
 298
 299         /* Mask interrupt */
 300
 301         r8 = inb(IC_PIC1+1);
 302         r8 |= (1 << irq);
 303         outb (r8,IC_PIC1+1);
 304 }
 305
 306 static void superio_enable_irq(unsigned int irq)
 307 {
 308         u8 r8;
 309
 310         if ((irq < 1) || (irq == 2) || (irq > 7)) {
 311                 printk(KERN_ERR PFX "Illegal irq number (%d).\n", irq);
 312                 BUG();
 313                 return;
 314         }
 315
 316         /* Unmask interrupt */
 317         r8 = inb(IC_PIC1+1);
 318         r8 &= ~(1 << irq);
 319         outb (r8,IC_PIC1+1);
 320 }
 321
 322 static unsigned int superio_startup_irq(unsigned int irq)
 323 {
 324         superio_enable_irq(irq);
 325         return 0;
 326 }
 327
 328 static struct irq_chip superio_interrupt_type = {
 329         .name    =      SUPERIO,
 330         .startup =      superio_startup_irq,
 331         .shutdown =     superio_disable_irq,
 332         .enable =       superio_enable_irq,
 333         .disable =      superio_disable_irq,
 334         .ack =          no_ack_irq,
 335         .end =          no_end_irq,
 336 };
 337
 338 #ifdef DEBUG_SUPERIO_INIT
 339 static unsigned short expected_device[3] = {
 340         PCI_DEVICE_ID_NS_87415,
 341         PCI_DEVICE_ID_NS_87560_LIO,
 342         PCI_DEVICE_ID_NS_87560_USB
 343 };
 344 #endif
 345
 346 int superio_fixup_irq(struct pci_dev *pcidev)
 347 {
 348         int local_irq, i;
 349
 350 #ifdef DEBUG_SUPERIO_INIT
 351         int fn;
 352         fn = PCI_FUNC(pcidev->devfn);
 353
 354         /* Verify the function number matches the expected device id. */
 355         if (expected_device[fn] != pcidev->device) {
 356                 BUG();
 357                 return -1;
 358         }
 359         printk("superio_fixup_irq(%s) ven 0x%x dev 0x%x from %p\n",
 360                 pci_name(pcidev),
 361                 pcidev->vendor, pcidev->device,
 362                 __builtin_return_address(0));
 363 #endif
 364
 365         for (i = 0; i < 16; i++) {
 366                 struct irq_desc *desc = irq_to_desc(i);
 367
 368                 desc->chip = &superio_interrupt_type;
 369         }
 370
 371         /*
 372          * We don't allocate a SuperIO irq for the legacy IO function,
 373          * since it is a "bridge". Instead, we will allocate irq's for
 374          * each legacy device as they are initialized.
 375          */
 376
 377         switch(pcidev->device) {
 378         case PCI_DEVICE_ID_NS_87415:            /* Function 0 */
 379                 local_irq = IDE_IRQ;
 380                 break;
 381         case PCI_DEVICE_ID_NS_87560_LIO:        /* Function 1 */
 382                 sio_dev.lio_pdev = pcidev;      /* save for superio_init() */
 383                 return -1;
 384         case PCI_DEVICE_ID_NS_87560_USB:        /* Function 2 */
 385                 sio_dev.usb_pdev = pcidev;      /* save for superio_init() */
 386                 local_irq = USB_IRQ;
 387                 break;
 388         default:
 389                 local_irq = -1;
 390                 BUG();
 391                 break;
 392         }
 393
 394         return local_irq;
 395 }
 396
 397 static void __init superio_serial_init(void)
 398 {
 399 #ifdef CONFIG_SERIAL_8250
 400         int retval;
 401         struct uart_port serial_port;
 402
 403         memset(&serial_port, 0, sizeof(serial_port));
 404         serial_port.iotype      = UPIO_PORT;
 405         serial_port.type        = PORT_16550A;
 406         serial_port.uartclk     = 115200*16;
 407         serial_port.fifosize    = 16;
 408
 409         /* serial port #1 */
 410         serial_port.iobase      = sio_dev.sp1_base;
 411         serial_port.irq         = SP1_IRQ;
 412         serial_port.line        = 0;
 413         retval = early_serial_setup(&serial_port);
 414         if (retval < 0) {
 415                 printk(KERN_WARNING PFX "Register Serial #0 failed.\n");
 416                 return;
 417         }
 418
 419         /* serial port #2 */
 420         serial_port.iobase      = sio_dev.sp2_base;
 421         serial_port.irq         = SP2_IRQ;
 422         serial_port.line        = 1;
 423         retval = early_serial_setup(&serial_port);
 424         if (retval < 0)
 425                 printk(KERN_WARNING PFX "Register Serial #1 failed.\n");
 426 #endif /* CONFIG_SERIAL_8250 */
 427 }
 428
 429
 430 static void __init superio_parport_init(void)
 431 {
 432 #ifdef CONFIG_PARPORT_PC
 433         if (!parport_pc_probe_port(sio_dev.pp_base,
 434                         0 /*base_hi*/,
 435                         PAR_IRQ,
 436                         PARPORT_DMA_NONE /* dma */,
 437                         NULL /*struct pci_dev* */,
 438                         0 /* shared irq flags */))
 439
 440                 printk(KERN_WARNING PFX "Probing parallel port failed.\n");
 441 #endif  /* CONFIG_PARPORT_PC */
 442 }
 443
 444
 445 static void superio_fixup_pci(struct pci_dev *pdev)
 446 {
 447         u8 prog;
 448
 449         pdev->class |= 0x5;
 450         pci_write_config_byte(pdev, PCI_CLASS_PROG, pdev->class);
 451
 452         pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
 453         printk("PCI: Enabled native mode for NS87415 (pif=0x%x)\n", prog);
 454 }
 455 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);
 456
 457
 458 static int __init
 459 superio_probe(struct pci_dev *dev, const struct pci_device_id *id)
 460 {
 461         struct superio_device *sio = &sio_dev;
 462
 463         /*
 464         ** superio_probe(00:0e.0) ven 0x100b dev 0x2 sv 0x0 sd 0x0 class 0x1018a
 465         ** superio_probe(00:0e.1) ven 0x100b dev 0xe sv 0x0 sd 0x0 class 0x68000
 466         ** superio_probe(00:0e.2) ven 0x100b dev 0x12 sv 0x0 sd 0x0 class 0xc0310
 467         */
 468         DBG_INIT("superio_probe(%s) ven 0x%x dev 0x%x sv 0x%x sd 0x%x class 0x%x\n",
 469                 pci_name(dev),
 470                 dev->vendor, dev->device,
 471                 dev->subsystem_vendor, dev->subsystem_device,
 472                 dev->class);
 473
 474         BUG_ON(!sio->suckyio_irq_enabled);      /* Enabled by PCI_FIXUP_FINAL */
 475
 476         if (dev->device == PCI_DEVICE_ID_NS_87560_LIO) {        /* Function 1 */
 477                 superio_parport_init();
 478                 superio_serial_init();
 479                 /* REVISIT XXX : superio_fdc_init() ? */
 480                 return 0;
 481         } else if (dev->device == PCI_DEVICE_ID_NS_87415) {     /* Function 0 */
 482                 DBG_INIT("superio_probe: ignoring IDE 87415\n");
 483         } else if (dev->device == PCI_DEVICE_ID_NS_87560_USB) { /* Function 2 */
 484                 DBG_INIT("superio_probe: ignoring USB OHCI controller\n");
 485         } else {
 486                 DBG_INIT("superio_probe: WTF? Fire Extinguisher?\n");
 487         }
 488
 489         /* Let appropriate other driver claim this device. */
 490         return -ENODEV;
 491 }
 492
 493 static const struct pci_device_id superio_tbl[] = {
 494         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO) },
 495         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_USB) },
 496         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415) },
 497         { 0, }
 498 };
 499
 500 static struct pci_driver superio_driver = {
 501         .name =         SUPERIO,
 502         .id_table =     superio_tbl,
 503         .probe =        superio_probe,
 504 };
 505
 506 static int __init superio_modinit(void)
 507 {
 508         return pci_register_driver(&superio_driver);
 509 }
 510
 511 static void __exit superio_exit(void)
 512 {
 513         pci_unregister_driver(&superio_driver);
 514 }
 515
 516 module_init(superio_modinit);
 517 module_exit(superio_exit);