drivers/parisc/superio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*      National Semiconductor NS87560UBD Super I/O controller used in
   3  *      HP [BCJ]x000 workstations.
   4  *
   5  *      This chip is a horrid piece of engineering, and National
   6  *      denies any knowledge of its existence. Thus no datasheet is
   7  *      available off www.national.com.
   8  *
   9  *      (C) Copyright 2000 Linuxcare, Inc.
  10  *      (C) Copyright 2000 Linuxcare Canada, Inc.
  11  *      (C) Copyright 2000 Martin K. Petersen <mkp@linuxcare.com>
  12  *      (C) Copyright 2000 Alex deVries <alex@onefishtwo.ca>
  13  *      (C) Copyright 2001 John Marvin <jsm fc hp com>
  14  *      (C) Copyright 2003 Grant Grundler <grundler parisc-linux org>
  15  *      (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
  16  *      (C) Copyright 2006 Helge Deller <deller@gmx.de>
  17  *
  18  *      The initial version of this is by Martin Peterson.  Alex deVries
  19  *      has spent a bit of time trying to coax it into working.
  20  *
  21  *      Major changes to get basic interrupt infrastructure working to
  22  *      hopefully be able to support all SuperIO devices. Currently
  23  *      works with serial. -- John Marvin <jsm@fc.hp.com>
  24  *
  25  *      Converted superio_init() to be a PCI_FIXUP_FINAL callee.
  26  *         -- Kyle McMartin <kyle@parisc-linux.org>
  27  */
  28
  29
  30 /* NOTES:
  31  *
  32  * Function 0 is an IDE controller. It is identical to a PC87415 IDE
  33  * controller (and identifies itself as such).
  34  *
  35  * Function 1 is a "Legacy I/O" controller. Under this function is a
  36  * whole mess of legacy I/O peripherals. Of course, HP hasn't enabled
  37  * all the functionality in hardware, but the following is available:
  38  *
  39  *      Two 16550A compatible serial controllers
  40  *      An IEEE 1284 compatible parallel port
  41  *      A floppy disk controller
  42  *
  43  * Function 2 is a USB controller.
  44  *
  45  * We must be incredibly careful during initialization.  Since all
  46  * interrupts are routed through function 1 (which is not allowed by
  47  * the PCI spec), we need to program the PICs on the legacy I/O port
  48  * *before* we attempt to set up IDE and USB.  @#$!&
  49  *
  50  * According to HP, devices are only enabled by firmware if they have
  51  * a physical device connected.
  52  *
  53  * Configuration register bits:
  54  *     0x5A: FDC, SP1, IDE1, SP2, IDE2, PAR, Reserved, P92
  55  *     0x5B: RTC, 8259, 8254, DMA1, DMA2, KBC, P61, APM
  56  *
  57  */
  58
  59 #include <linux/errno.h>
  60 #include <linux/init.h>
  61 #include <linux/module.h>
  62 #include <linux/types.h>
  63 #include <linux/interrupt.h>
  64 #include <linux/ioport.h>
  65 #include <linux/serial.h>
  66 #include <linux/pci.h>
  67 #include <linux/parport.h>
  68 #include <linux/parport_pc.h>
  69 #include <linux/termios.h>
  70 #include <linux/tty.h>
  71 #include <linux/serial_core.h>
  72 #include <linux/serial_8250.h>
  73 #include <linux/delay.h>
  74
  75 #include <asm/io.h>
  76 #include <asm/hardware.h>
  77 #include <asm/superio.h>
  78
  79 static struct superio_device sio_dev;
  80
  81
  82 #undef DEBUG_SUPERIO_INIT
  83
  84 #ifdef DEBUG_SUPERIO_INIT
  85 #define DBG_INIT(x...)  printk(x)
  86 #else
  87 #define DBG_INIT(x...)
  88 #endif
  89
  90 #define SUPERIO "SuperIO"
  91 #define PFX     SUPERIO ": "
  92
  93 static irqreturn_t
  94 superio_interrupt(int parent_irq, void *devp)
  95 {
  96         u8 results;
  97         u8 local_irq;
  98
  99         /* Poll the 8259 to see if there's an interrupt. */
 100         outb (OCW3_POLL,IC_PIC1+0);
 101
 102         results = inb(IC_PIC1+0);
 103
 104         /*
 105          * Bit    7:    1 = active Interrupt; 0 = no Interrupt pending
 106          * Bits 6-3:    zero
 107          * Bits 2-0:    highest priority, active requesting interrupt ID (0-7)
 108          */
 109         if ((results & 0x80) == 0) {
 110                 /* I suspect "spurious" interrupts are from unmasking an IRQ.
 111                  * We don't know if an interrupt was/is pending and thus
 112                  * just call the handler for that IRQ as if it were pending.
 113                  */
 114                 return IRQ_NONE;
 115         }
 116
 117         /* Check to see which device is interrupting */
 118         local_irq = results & 0x0f;
 119
 120         if (local_irq == 2 || local_irq > 7) {
 121                 printk(KERN_ERR PFX "slave interrupted!\n");
 122                 return IRQ_HANDLED;
 123         }
 124
 125         if (local_irq == 7) {
 126
 127                 /* Could be spurious. Check in service bits */
 128
 129                 outb(OCW3_ISR,IC_PIC1+0);
 130                 results = inb(IC_PIC1+0);
 131                 if ((results & 0x80) == 0) { /* if ISR7 not set: spurious */
 132                         printk(KERN_WARNING PFX "spurious interrupt!\n");
 133                         return IRQ_HANDLED;
 134                 }
 135         }
 136
 137         /* Call the appropriate device's interrupt */
 138         generic_handle_irq(local_irq);
 139
 140         /* set EOI - forces a new interrupt if a lower priority device
 141          * still needs service.
 142          */
 143         outb((OCW2_SEOI|local_irq),IC_PIC1 + 0);
 144         return IRQ_HANDLED;
 145 }
 146
 147 /* Initialize Super I/O device */
 148 static void
 149 superio_init(struct pci_dev *pcidev)
 150 {
 151         struct superio_device *sio = &sio_dev;
 152         struct pci_dev *pdev = sio->lio_pdev;
 153         u16 word;
 154         int ret;
 155
 156         if (sio->suckyio_irq_enabled)
 157                 return;
 158
 159         BUG_ON(!pdev);
 160         BUG_ON(!sio->usb_pdev);
 161
 162         /* use the IRQ iosapic found for USB INT D... */
 163         pdev->irq = sio->usb_pdev->irq;
 164
 165         /* ...then properly fixup the USB to point at suckyio PIC */
 166         sio->usb_pdev->irq = superio_fixup_irq(sio->usb_pdev);
 167
 168         printk(KERN_INFO PFX "Found NS87560 Legacy I/O device at %s (IRQ %i)\n",
 169                pci_name(pdev), pdev->irq);
 170
 171         pci_read_config_dword (pdev, SIO_SP1BAR, &sio->sp1_base);
 172         sio->sp1_base &= ~1;
 173         printk(KERN_INFO PFX "Serial port 1 at 0x%x\n", sio->sp1_base);
 174
 175         pci_read_config_dword (pdev, SIO_SP2BAR, &sio->sp2_base);
 176         sio->sp2_base &= ~1;
 177         printk(KERN_INFO PFX "Serial port 2 at 0x%x\n", sio->sp2_base);
 178
 179         pci_read_config_dword (pdev, SIO_PPBAR, &sio->pp_base);
 180         sio->pp_base &= ~1;
 181         printk(KERN_INFO PFX "Parallel port at 0x%x\n", sio->pp_base);
 182
 183         pci_read_config_dword (pdev, SIO_FDCBAR, &sio->fdc_base);
 184         sio->fdc_base &= ~1;
 185         printk(KERN_INFO PFX "Floppy controller at 0x%x\n", sio->fdc_base);
 186         pci_read_config_dword (pdev, SIO_ACPIBAR, &sio->acpi_base);
 187         sio->acpi_base &= ~1;
 188         printk(KERN_INFO PFX "ACPI at 0x%x\n", sio->acpi_base);
 189
 190         request_region (IC_PIC1, 0x1f, "pic1");
 191         request_region (IC_PIC2, 0x1f, "pic2");
 192         request_region (sio->acpi_base, 0x1f, "acpi");
 193
 194         /* Enable the legacy I/O function */
 195         pci_read_config_word (pdev, PCI_COMMAND, &word);
 196         word |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_IO;
 197         pci_write_config_word (pdev, PCI_COMMAND, word);
 198
 199         pci_set_master (pdev);
 200         ret = pci_enable_device(pdev);
 201         BUG_ON(ret < 0);        /* not too much we can do about this... */
 202
 203         /*
 204          * Next project is programming the onboard interrupt controllers.
 205          * PDC hasn't done this for us, since it's using polled I/O.
 206          *
 207          * XXX Use dword writes to avoid bugs in Elroy or Suckyio Config
 208          *     space access.  PCI is by nature a 32-bit bus and config
 209          *     space can be sensitive to that.
 210          */
 211
 212         /* 0x64 - 0x67 :
 213                 DMA Rtg 2
 214                 DMA Rtg 3
 215                 DMA Chan Ctl
 216                 TRIGGER_1    == 0x82   USB & IDE level triggered, rest to edge
 217         */
 218         pci_write_config_dword (pdev, 0x64,         0x82000000U);
 219
 220         /* 0x68 - 0x6b :
 221                 TRIGGER_2    == 0x00   all edge triggered (not used)
 222                 CFG_IR_SER   == 0x43   SerPort1 = IRQ3, SerPort2 = IRQ4
 223                 CFG_IR_PF    == 0x65   ParPort  = IRQ5, FloppyCtlr = IRQ6
 224                 CFG_IR_IDE   == 0x07   IDE1 = IRQ7, reserved
 225         */
 226         pci_write_config_dword (pdev, TRIGGER_2,    0x07654300U);
 227
 228         /* 0x6c - 0x6f :
 229                 CFG_IR_INTAB == 0x00
 230                 CFG_IR_INTCD == 0x10   USB = IRQ1
 231                 CFG_IR_PS2   == 0x00
 232                 CFG_IR_FXBUS == 0x00
 233         */
 234         pci_write_config_dword (pdev, CFG_IR_INTAB, 0x00001000U);
 235
 236         /* 0x70 - 0x73 :
 237                 CFG_IR_USB   == 0x00  not used. USB is connected to INTD.
 238                 CFG_IR_ACPI  == 0x00  not used.
 239                 DMA Priority == 0x4c88  Power on default value. NFC.
 240         */
 241         pci_write_config_dword (pdev, CFG_IR_USB, 0x4c880000U);
 242
 243         /* PIC1 Initialization Command Word register programming */
 244         outb (0x11,IC_PIC1+0);  /* ICW1: ICW4 write req | ICW1 */
 245         outb (0x00,IC_PIC1+1);  /* ICW2: interrupt vector table - not used */
 246         outb (0x04,IC_PIC1+1);  /* ICW3: Cascade */
 247         outb (0x01,IC_PIC1+1);  /* ICW4: x86 mode */
 248
 249         /* PIC1 Program Operational Control Words */
 250         outb (0xff,IC_PIC1+1);  /* OCW1: Mask all interrupts */
 251         outb (0xc2,IC_PIC1+0);  /* OCW2: priority (3-7,0-2) */
 252
 253         /* PIC2 Initialization Command Word register programming */
 254         outb (0x11,IC_PIC2+0);  /* ICW1: ICW4 write req | ICW1 */
 255         outb (0x00,IC_PIC2+1);  /* ICW2: N/A */
 256         outb (0x02,IC_PIC2+1);  /* ICW3: Slave ID code */
 257         outb (0x01,IC_PIC2+1);  /* ICW4: x86 mode */
 258
 259         /* Program Operational Control Words */
 260         outb (0xff,IC_PIC1+1);  /* OCW1: Mask all interrupts */
 261         outb (0x68,IC_PIC1+0);  /* OCW3: OCW3 select | ESMM | SMM */
 262
 263         /* Write master mask reg */
 264         outb (0xff,IC_PIC1+1);
 265
 266         /* Setup USB power regulation */
 267         outb(1, sio->acpi_base + USB_REG_CR);
 268         if (inb(sio->acpi_base + USB_REG_CR) & 1)
 269                 printk(KERN_INFO PFX "USB regulator enabled\n");
 270         else
 271                 printk(KERN_ERR PFX "USB regulator not initialized!\n");
 272
 273         if (request_irq(pdev->irq, superio_interrupt, 0,
 274                         SUPERIO, (void *)sio)) {
 275
 276                 printk(KERN_ERR PFX "could not get irq\n");
 277                 BUG();
 278                 return;
 279         }
 280
 281         sio->suckyio_irq_enabled = 1;
 282 }
 283 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO, superio_init);
 284
 285 static void superio_mask_irq(struct irq_data *d)
 286 {
 287         unsigned int irq = d->irq;
 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_unmask_irq(struct irq_data *d)
 304 {
 305         unsigned int irq = d->irq;
 306         u8 r8;
 307
 308         if ((irq < 1) || (irq == 2) || (irq > 7)) {
 309                 printk(KERN_ERR PFX "Illegal irq number (%d).\n", irq);
 310                 BUG();
 311                 return;
 312         }
 313
 314         /* Unmask interrupt */
 315         r8 = inb(IC_PIC1+1);
 316         r8 &= ~(1 << irq);
 317         outb (r8,IC_PIC1+1);
 318 }
 319
 320 static struct irq_chip superio_interrupt_type = {
 321         .name           =       SUPERIO,
 322         .irq_unmask     =       superio_unmask_irq,
 323         .irq_mask       =       superio_mask_irq,
 324 };
 325
 326 #ifdef DEBUG_SUPERIO_INIT
 327 static unsigned short expected_device[3] = {
 328         PCI_DEVICE_ID_NS_87415,
 329         PCI_DEVICE_ID_NS_87560_LIO,
 330         PCI_DEVICE_ID_NS_87560_USB
 331 };
 332 #endif
 333
 334 int superio_fixup_irq(struct pci_dev *pcidev)
 335 {
 336         int local_irq, i;
 337
 338 #ifdef DEBUG_SUPERIO_INIT
 339         int fn;
 340         fn = PCI_FUNC(pcidev->devfn);
 341
 342         /* Verify the function number matches the expected device id. */
 343         if (expected_device[fn] != pcidev->device) {
 344                 BUG();
 345                 return -1;
 346         }
 347         printk(KERN_DEBUG "superio_fixup_irq(%s) ven 0x%x dev 0x%x from %ps\n",
 348                 pci_name(pcidev),
 349                 pcidev->vendor, pcidev->device,
 350                 __builtin_return_address(0));
 351 #endif
 352
 353         for (i = 0; i < 16; i++) {
 354                 irq_set_chip_and_handler(i, &superio_interrupt_type,
 355                                          handle_simple_irq);
 356         }
 357
 358         /*
 359          * We don't allocate a SuperIO irq for the legacy IO function,
 360          * since it is a "bridge". Instead, we will allocate irq's for
 361          * each legacy device as they are initialized.
 362          */
 363
 364         switch(pcidev->device) {
 365         case PCI_DEVICE_ID_NS_87415:            /* Function 0 */
 366                 local_irq = IDE_IRQ;
 367                 break;
 368         case PCI_DEVICE_ID_NS_87560_LIO:        /* Function 1 */
 369                 sio_dev.lio_pdev = pcidev;      /* save for superio_init() */
 370                 return -1;
 371         case PCI_DEVICE_ID_NS_87560_USB:        /* Function 2 */
 372                 sio_dev.usb_pdev = pcidev;      /* save for superio_init() */
 373                 local_irq = USB_IRQ;
 374                 break;
 375         default:
 376                 local_irq = -1;
 377                 BUG();
 378                 break;
 379         }
 380
 381         return local_irq;
 382 }
 383
 384 static void __init superio_serial_init(void)
 385 {
 386 #ifdef CONFIG_SERIAL_8250
 387         int retval;
 388         struct uart_port serial_port;
 389
 390         memset(&serial_port, 0, sizeof(serial_port));
 391         serial_port.iotype      = UPIO_PORT;
 392         serial_port.type        = PORT_16550A;
 393         serial_port.uartclk     = 115200*16;
 394         serial_port.flags       = UPF_FIXED_PORT | UPF_FIXED_TYPE |
 395                                   UPF_BOOT_AUTOCONF;
 396
 397         /* serial port #1 */
 398         serial_port.iobase      = sio_dev.sp1_base;
 399         serial_port.irq         = SP1_IRQ;
 400         serial_port.line        = 0;
 401         retval = early_serial_setup(&serial_port);
 402         if (retval < 0) {
 403                 printk(KERN_WARNING PFX "Register Serial #0 failed.\n");
 404                 return;
 405         }
 406
 407         /* serial port #2 */
 408         serial_port.iobase      = sio_dev.sp2_base;
 409         serial_port.irq         = SP2_IRQ;
 410         serial_port.line        = 1;
 411         retval = early_serial_setup(&serial_port);
 412         if (retval < 0)
 413                 printk(KERN_WARNING PFX "Register Serial #1 failed.\n");
 414 #endif /* CONFIG_SERIAL_8250 */
 415 }
 416
 417
 418 static void __init superio_parport_init(void)
 419 {
 420 #ifdef CONFIG_PARPORT_PC
 421         if (!parport_pc_probe_port(sio_dev.pp_base,
 422                         0 /*base_hi*/,
 423                         PAR_IRQ,
 424                         PARPORT_DMA_NONE /* dma */,
 425                         NULL /*struct pci_dev* */,
 426                         0 /* shared irq flags */))
 427
 428                 printk(KERN_WARNING PFX "Probing parallel port failed.\n");
 429 #endif  /* CONFIG_PARPORT_PC */
 430 }
 431
 432
 433 static void superio_fixup_pci(struct pci_dev *pdev)
 434 {
 435         u8 prog;
 436
 437         pdev->class |= 0x5;
 438         pci_write_config_byte(pdev, PCI_CLASS_PROG, pdev->class);
 439
 440         pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
 441         printk("PCI: Enabled native mode for NS87415 (pif=0x%x)\n", prog);
 442 }
 443 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);
 444
 445
 446 static int __init
 447 superio_probe(struct pci_dev *dev, const struct pci_device_id *id)
 448 {
 449         struct superio_device *sio = &sio_dev;
 450
 451         /*
 452         ** superio_probe(00:0e.0) ven 0x100b dev 0x2 sv 0x0 sd 0x0 class 0x1018a
 453         ** superio_probe(00:0e.1) ven 0x100b dev 0xe sv 0x0 sd 0x0 class 0x68000
 454         ** superio_probe(00:0e.2) ven 0x100b dev 0x12 sv 0x0 sd 0x0 class 0xc0310
 455         */
 456         DBG_INIT("superio_probe(%s) ven 0x%x dev 0x%x sv 0x%x sd 0x%x class 0x%x\n",
 457                 pci_name(dev),
 458                 dev->vendor, dev->device,
 459                 dev->subsystem_vendor, dev->subsystem_device,
 460                 dev->class);
 461
 462         BUG_ON(!sio->suckyio_irq_enabled);      /* Enabled by PCI_FIXUP_FINAL */
 463
 464         if (dev->device == PCI_DEVICE_ID_NS_87560_LIO) {        /* Function 1 */
 465                 superio_parport_init();
 466                 superio_serial_init();
 467                 /* REVISIT XXX : superio_fdc_init() ? */
 468                 return 0;
 469         } else if (dev->device == PCI_DEVICE_ID_NS_87415) {     /* Function 0 */
 470                 DBG_INIT("superio_probe: ignoring IDE 87415\n");
 471         } else if (dev->device == PCI_DEVICE_ID_NS_87560_USB) { /* Function 2 */
 472                 DBG_INIT("superio_probe: ignoring USB OHCI controller\n");
 473         } else {
 474                 DBG_INIT("superio_probe: WTF? Fire Extinguisher?\n");
 475         }
 476
 477         /* Let appropriate other driver claim this device. */
 478         return -ENODEV;
 479 }
 480
 481 static const struct pci_device_id superio_tbl[] __initconst = {
 482         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO) },
 483         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_USB) },
 484         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415) },
 485         { 0, }
 486 };
 487
 488 static struct pci_driver superio_driver __refdata = {
 489         .name =         SUPERIO,
 490         .id_table =     superio_tbl,
 491         .probe =        superio_probe,
 492 };
 493
 494 module_pci_driver(superio_driver);