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/delay.h>
  77
  78 #include <asm/io.h>
  79 #include <asm/hardware.h>
  80 #include <asm/superio.h>
  81
  82 static struct superio_device sio_dev;
  83
  84
  85 #undef DEBUG_SUPERIO_INIT
  86
  87 #ifdef DEBUG_SUPERIO_INIT
  88 #define DBG_INIT(x...)  printk(x)
  89 #else
  90 #define DBG_INIT(x...)
  91 #endif
  92
  93 #define SUPERIO "SuperIO"
  94 #define PFX     SUPERIO ": "
  95
  96 static irqreturn_t
  97 superio_interrupt(int parent_irq, void *devp, struct pt_regs *regs)
  98 {
  99         u8 results;
 100         u8 local_irq;
 101
 102         /* Poll the 8259 to see if there's an interrupt. */
 103         outb (OCW3_POLL,IC_PIC1+0);
 104
 105         results = inb(IC_PIC1+0);
 106
 107         /*
 108          * Bit    7:    1 = active Interrupt; 0 = no Interrupt pending
 109          * Bits 6-3:    zero
 110          * Bits 2-0:    highest priority, active requesting interrupt ID (0-7)
 111          */
 112         if ((results & 0x80) == 0) {
 113                 /* I suspect "spurious" interrupts are from unmasking an IRQ.
 114                  * We don't know if an interrupt was/is pending and thus
 115                  * just call the handler for that IRQ as if it were pending.
 116                  */
 117                 return IRQ_NONE;
 118         }
 119
 120         /* Check to see which device is interrupting */
 121         local_irq = results & 0x0f;
 122
 123         if (local_irq == 2 || local_irq > 7) {
 124                 printk(KERN_ERR PFX "slave interrupted!\n");
 125                 return IRQ_HANDLED;
 126         }
 127
 128         if (local_irq == 7) {
 129
 130                 /* Could be spurious. Check in service bits */
 131
 132                 outb(OCW3_ISR,IC_PIC1+0);
 133                 results = inb(IC_PIC1+0);
 134                 if ((results & 0x80) == 0) { /* if ISR7 not set: spurious */
 135                         printk(KERN_WARNING PFX "spurious interrupt!\n");
 136                         return IRQ_HANDLED;
 137                 }
 138         }
 139
 140         /* Call the appropriate device's interrupt */
 141         __do_IRQ(local_irq, regs);
 142
 143         /* set EOI - forces a new interrupt if a lower priority device
 144          * still needs service.
 145          */
 146         outb((OCW2_SEOI|local_irq),IC_PIC1 + 0);
 147         return IRQ_HANDLED;
 148 }
 149
 150 /* Initialize Super I/O device */
 151 static void
 152 superio_init(struct pci_dev *pcidev)
 153 {
 154         struct superio_device *sio = &sio_dev;
 155         struct pci_dev *pdev = sio->lio_pdev;
 156         u16 word;
 157
 158         if (sio->suckyio_irq_enabled)
 159                 return;
 160
 161         BUG_ON(!pdev);
 162         BUG_ON(!sio->usb_pdev);
 163
 164         /* use the IRQ iosapic found for USB INT D... */
 165         pdev->irq = sio->usb_pdev->irq;
 166
 167         /* ...then properly fixup the USB to point at suckyio PIC */
 168         sio->usb_pdev->irq = superio_fixup_irq(sio->usb_pdev);
 169
 170         printk(KERN_INFO PFX "Found NS87560 Legacy I/O device at %s (IRQ %i) \n",
 171                pci_name(pdev), pdev->irq);
 172
 173         pci_read_config_dword (pdev, SIO_SP1BAR, &sio->sp1_base);
 174         sio->sp1_base &= ~1;
 175         printk(KERN_INFO PFX "Serial port 1 at 0x%x\n", sio->sp1_base);
 176
 177         pci_read_config_dword (pdev, SIO_SP2BAR, &sio->sp2_base);
 178         sio->sp2_base &= ~1;
 179         printk(KERN_INFO PFX "Serial port 2 at 0x%x\n", sio->sp2_base);
 180
 181         pci_read_config_dword (pdev, SIO_PPBAR, &sio->pp_base);
 182         sio->pp_base &= ~1;
 183         printk(KERN_INFO PFX "Parallel port at 0x%x\n", sio->pp_base);
 184
 185         pci_read_config_dword (pdev, SIO_FDCBAR, &sio->fdc_base);
 186         sio->fdc_base &= ~1;
 187         printk(KERN_INFO PFX "Floppy controller at 0x%x\n", sio->fdc_base);
 188         pci_read_config_dword (pdev, SIO_ACPIBAR, &sio->acpi_base);
 189         sio->acpi_base &= ~1;
 190         printk(KERN_INFO PFX "ACPI at 0x%x\n", sio->acpi_base);
 191
 192         request_region (IC_PIC1, 0x1f, "pic1");
 193         request_region (IC_PIC2, 0x1f, "pic2");
 194         request_region (sio->acpi_base, 0x1f, "acpi");
 195
 196         /* Enable the legacy I/O function */
 197         pci_read_config_word (pdev, PCI_COMMAND, &word);
 198         word |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_IO;
 199         pci_write_config_word (pdev, PCI_COMMAND, word);
 200
 201         pci_set_master (pdev);
 202         pci_enable_device(pdev);
 203
 204         /*
 205          * Next project is programming the onboard interrupt controllers.
 206          * PDC hasn't done this for us, since it's using polled I/O.
 207          *
 208          * XXX Use dword writes to avoid bugs in Elroy or Suckyio Config
 209          *     space access.  PCI is by nature a 32-bit bus and config
 210          *     space can be sensitive to that.
 211          */
 212
 213         /* 0x64 - 0x67 :
 214                 DMA Rtg 2
 215                 DMA Rtg 3
 216                 DMA Chan Ctl
 217                 TRIGGER_1    == 0x82   USB & IDE level triggered, rest to edge
 218         */
 219         pci_write_config_dword (pdev, 0x64,         0x82000000U);
 220
 221         /* 0x68 - 0x6b :
 222                 TRIGGER_2    == 0x00   all edge triggered (not used)
 223                 CFG_IR_SER   == 0x43   SerPort1 = IRQ3, SerPort2 = IRQ4
 224                 CFG_IR_PF    == 0x65   ParPort  = IRQ5, FloppyCtlr = IRQ6
 225                 CFG_IR_IDE   == 0x07   IDE1 = IRQ7, reserved
 226         */
 227         pci_write_config_dword (pdev, TRIGGER_2,    0x07654300U);
 228
 229         /* 0x6c - 0x6f :
 230                 CFG_IR_INTAB == 0x00
 231                 CFG_IR_INTCD == 0x10   USB = IRQ1
 232                 CFG_IR_PS2   == 0x00
 233                 CFG_IR_FXBUS == 0x00
 234         */
 235         pci_write_config_dword (pdev, CFG_IR_INTAB, 0x00001000U);
 236
 237         /* 0x70 - 0x73 :
 238                 CFG_IR_USB   == 0x00  not used. USB is connected to INTD.
 239                 CFG_IR_ACPI  == 0x00  not used.
 240                 DMA Priority == 0x4c88  Power on default value. NFC.
 241         */
 242         pci_write_config_dword (pdev, CFG_IR_USB, 0x4c880000U);
 243
 244         /* PIC1 Initialization Command Word register programming */
 245         outb (0x11,IC_PIC1+0);  /* ICW1: ICW4 write req | ICW1 */
 246         outb (0x00,IC_PIC1+1);  /* ICW2: interrupt vector table - not used */
 247         outb (0x04,IC_PIC1+1);  /* ICW3: Cascade */
 248         outb (0x01,IC_PIC1+1);  /* ICW4: x86 mode */
 249
 250         /* PIC1 Program Operational Control Words */
 251         outb (0xff,IC_PIC1+1);  /* OCW1: Mask all interrupts */
 252         outb (0xc2,IC_PIC1+0);  /* OCW2: priority (3-7,0-2) */
 253
 254         /* PIC2 Initialization Command Word register programming */
 255         outb (0x11,IC_PIC2+0);  /* ICW1: ICW4 write req | ICW1 */
 256         outb (0x00,IC_PIC2+1);  /* ICW2: N/A */
 257         outb (0x02,IC_PIC2+1);  /* ICW3: Slave ID code */
 258         outb (0x01,IC_PIC2+1);  /* ICW4: x86 mode */
 259
 260         /* Program Operational Control Words */
 261         outb (0xff,IC_PIC1+1);  /* OCW1: Mask all interrupts */
 262         outb (0x68,IC_PIC1+0);  /* OCW3: OCW3 select | ESMM | SMM */
 263
 264         /* Write master mask reg */
 265         outb (0xff,IC_PIC1+1);
 266
 267         /* Setup USB power regulation */
 268         outb(1, sio->acpi_base + USB_REG_CR);
 269         if (inb(sio->acpi_base + USB_REG_CR) & 1)
 270                 printk(KERN_INFO PFX "USB regulator enabled\n");
 271         else
 272                 printk(KERN_ERR PFX "USB regulator not initialized!\n");
 273
 274         if (request_irq(pdev->irq, superio_interrupt, IRQF_DISABLED,
 275                         SUPERIO, (void *)sio)) {
 276
 277                 printk(KERN_ERR PFX "could not get irq\n");
 278                 BUG();
 279                 return;
 280         }
 281
 282         sio->suckyio_irq_enabled = 1;
 283 }
 284 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO, superio_init);
 285
 286 static void superio_disable_irq(unsigned int irq)
 287 {
 288         u8 r8;
 289
 290         if ((irq < 1) || (irq == 2) || (irq > 7)) {
 291                 printk(KERN_ERR PFX "Illegal irq number.\n");
 292                 BUG();
 293                 return;
 294         }
 295
 296         /* Mask interrupt */
 297
 298         r8 = inb(IC_PIC1+1);
 299         r8 |= (1 << irq);
 300         outb (r8,IC_PIC1+1);
 301 }
 302
 303 static void superio_enable_irq(unsigned int irq)
 304 {
 305         u8 r8;
 306
 307         if ((irq < 1) || (irq == 2) || (irq > 7)) {
 308                 printk(KERN_ERR PFX "Illegal irq number (%d).\n", irq);
 309                 BUG();
 310                 return;
 311         }
 312
 313         /* Unmask interrupt */
 314         r8 = inb(IC_PIC1+1);
 315         r8 &= ~(1 << irq);
 316         outb (r8,IC_PIC1+1);
 317 }
 318
 319 static unsigned int superio_startup_irq(unsigned int irq)
 320 {
 321         superio_enable_irq(irq);
 322         return 0;
 323 }
 324
 325 static struct hw_interrupt_type superio_interrupt_type = {
 326         .typename =     SUPERIO,
 327         .startup =      superio_startup_irq,
 328         .shutdown =     superio_disable_irq,
 329         .enable =       superio_enable_irq,
 330         .disable =      superio_disable_irq,
 331         .ack =          no_ack_irq,
 332         .end =          no_end_irq,
 333 };
 334
 335 #ifdef DEBUG_SUPERIO_INIT
 336 static unsigned short expected_device[3] = {
 337         PCI_DEVICE_ID_NS_87415,
 338         PCI_DEVICE_ID_NS_87560_LIO,
 339         PCI_DEVICE_ID_NS_87560_USB
 340 };
 341 #endif
 342
 343 int superio_fixup_irq(struct pci_dev *pcidev)
 344 {
 345         int local_irq, i;
 346
 347 #ifdef DEBUG_SUPERIO_INIT
 348         int fn;
 349         fn = PCI_FUNC(pcidev->devfn);
 350
 351         /* Verify the function number matches the expected device id. */
 352         if (expected_device[fn] != pcidev->device) {
 353                 BUG();
 354                 return -1;
 355         }
 356         printk("superio_fixup_irq(%s) ven 0x%x dev 0x%x from %p\n",
 357                 pci_name(pcidev),
 358                 pcidev->vendor, pcidev->device,
 359                 __builtin_return_address(0));
 360 #endif
 361
 362         for (i = 0; i < 16; i++) {
 363                 irq_desc[i].chip = &superio_interrupt_type;
 364         }
 365
 366         /*
 367          * We don't allocate a SuperIO irq for the legacy IO function,
 368          * since it is a "bridge". Instead, we will allocate irq's for
 369          * each legacy device as they are initialized.
 370          */
 371
 372         switch(pcidev->device) {
 373         case PCI_DEVICE_ID_NS_87415:            /* Function 0 */
 374                 local_irq = IDE_IRQ;
 375                 break;
 376         case PCI_DEVICE_ID_NS_87560_LIO:        /* Function 1 */
 377                 sio_dev.lio_pdev = pcidev;      /* save for superio_init() */
 378                 return -1;
 379         case PCI_DEVICE_ID_NS_87560_USB:        /* Function 2 */
 380                 sio_dev.usb_pdev = pcidev;      /* save for superio_init() */
 381                 local_irq = USB_IRQ;
 382                 break;
 383         default:
 384                 local_irq = -1;
 385                 BUG();
 386                 break;
 387         }
 388
 389         return local_irq;
 390 }
 391
 392 static void __devinit superio_serial_init(void)
 393 {
 394 #ifdef CONFIG_SERIAL_8250
 395         int retval;
 396         struct uart_port serial_port;
 397
 398         memset(&serial_port, 0, sizeof(serial_port));
 399         serial_port.iotype      = UPIO_PORT;
 400         serial_port.type        = PORT_16550A;
 401         serial_port.uartclk     = 115200*16;
 402         serial_port.fifosize    = 16;
 403         spin_lock_init(&serial_port.lock);
 404
 405         /* serial port #1 */
 406         serial_port.iobase      = sio_dev.sp1_base;
 407         serial_port.irq         = SP1_IRQ;
 408         serial_port.line        = 0;
 409         retval = early_serial_setup(&serial_port);
 410         if (retval < 0) {
 411                 printk(KERN_WARNING PFX "Register Serial #0 failed.\n");
 412                 return;
 413         }
 414
 415         /* serial port #2 */
 416         serial_port.iobase      = sio_dev.sp2_base;
 417         serial_port.irq         = SP2_IRQ;
 418         serial_port.line        = 1;
 419         retval = early_serial_setup(&serial_port);
 420         if (retval < 0)
 421                 printk(KERN_WARNING PFX "Register Serial #1 failed.\n");
 422 #endif /* CONFIG_SERIAL_8250 */
 423 }
 424
 425
 426 static void __devinit superio_parport_init(void)
 427 {
 428 #ifdef CONFIG_PARPORT_PC
 429         if (!parport_pc_probe_port(sio_dev.pp_base,
 430                         0 /*base_hi*/,
 431                         PAR_IRQ,
 432                         PARPORT_DMA_NONE /* dma */,
 433                         NULL /*struct pci_dev* */) )
 434
 435                 printk(KERN_WARNING PFX "Probing parallel port failed.\n");
 436 #endif  /* CONFIG_PARPORT_PC */
 437 }
 438
 439
 440 static void superio_fixup_pci(struct pci_dev *pdev)
 441 {
 442         u8 prog;
 443
 444         pdev->class |= 0x5;
 445         pci_write_config_byte(pdev, PCI_CLASS_PROG, pdev->class);
 446
 447         pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
 448         printk("PCI: Enabled native mode for NS87415 (pif=0x%x)\n", prog);
 449 }
 450 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);
 451
 452
 453 static int __devinit
 454 superio_probe(struct pci_dev *dev, const struct pci_device_id *id)
 455 {
 456         struct superio_device *sio = &sio_dev;
 457
 458         /*
 459         ** superio_probe(00:0e.0) ven 0x100b dev 0x2 sv 0x0 sd 0x0 class 0x1018a
 460         ** superio_probe(00:0e.1) ven 0x100b dev 0xe sv 0x0 sd 0x0 class 0x68000
 461         ** superio_probe(00:0e.2) ven 0x100b dev 0x12 sv 0x0 sd 0x0 class 0xc0310
 462         */
 463         DBG_INIT("superio_probe(%s) ven 0x%x dev 0x%x sv 0x%x sd 0x%x class 0x%x\n",
 464                 pci_name(dev),
 465                 dev->vendor, dev->device,
 466                 dev->subsystem_vendor, dev->subsystem_device,
 467                 dev->class);
 468
 469         BUG_ON(!sio->suckyio_irq_enabled);      /* Enabled by PCI_FIXUP_FINAL */
 470
 471         if (dev->device == PCI_DEVICE_ID_NS_87560_LIO) {        /* Function 1 */
 472                 superio_parport_init();
 473                 superio_serial_init();
 474                 /* REVISIT XXX : superio_fdc_init() ? */
 475                 return 0;
 476         } else if (dev->device == PCI_DEVICE_ID_NS_87415) {     /* Function 0 */
 477                 DBG_INIT("superio_probe: ignoring IDE 87415\n");
 478         } else if (dev->device == PCI_DEVICE_ID_NS_87560_USB) { /* Function 2 */
 479                 DBG_INIT("superio_probe: ignoring USB OHCI controller\n");
 480         } else {
 481                 DBG_INIT("superio_probe: WTF? Fire Extinguisher?\n");
 482         }
 483
 484         /* Let appropriate other driver claim this device. */
 485         return -ENODEV;
 486 }
 487
 488 static struct pci_device_id superio_tbl[] = {
 489         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO) },
 490         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_USB) },
 491         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415) },
 492         { 0, }
 493 };
 494
 495 static struct pci_driver superio_driver = {
 496         .name =         SUPERIO,
 497         .id_table =     superio_tbl,
 498         .probe =        superio_probe,
 499 };
 500
 501 static int __init superio_modinit(void)
 502 {
 503         return pci_register_driver(&superio_driver);
 504 }
 505
 506 static void __exit superio_exit(void)
 507 {
 508         pci_unregister_driver(&superio_driver);
 509 }
 510
 511 module_init(superio_modinit);
 512 module_exit(superio_exit);