linux/drivers/parisc/superio.c
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   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
  83static 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
  97static irqreturn_t
  98superio_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        generic_handle_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 */
 152static void
 153superio_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, 0,
 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}
 287DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO, superio_init);
 288
 289static void superio_mask_irq(struct irq_data *d)
 290{
 291        unsigned int irq = d->irq;
 292        u8 r8;
 293
 294        if ((irq < 1) || (irq == 2) || (irq > 7)) {
 295                printk(KERN_ERR PFX "Illegal irq number.\n");
 296                BUG();
 297                return;
 298        }
 299
 300        /* Mask interrupt */
 301
 302        r8 = inb(IC_PIC1+1);
 303        r8 |= (1 << irq);
 304        outb (r8,IC_PIC1+1);
 305}
 306
 307static void superio_unmask_irq(struct irq_data *d)
 308{
 309        unsigned int irq = d->irq;
 310        u8 r8;
 311
 312        if ((irq < 1) || (irq == 2) || (irq > 7)) {
 313                printk(KERN_ERR PFX "Illegal irq number (%d).\n", irq);
 314                BUG();
 315                return;
 316        }
 317
 318        /* Unmask interrupt */
 319        r8 = inb(IC_PIC1+1);
 320        r8 &= ~(1 << irq);
 321        outb (r8,IC_PIC1+1);
 322}
 323
 324static struct irq_chip superio_interrupt_type = {
 325        .name           =       SUPERIO,
 326        .irq_unmask     =       superio_unmask_irq,
 327        .irq_mask       =       superio_mask_irq,
 328};
 329
 330#ifdef DEBUG_SUPERIO_INIT
 331static unsigned short expected_device[3] = {
 332        PCI_DEVICE_ID_NS_87415,
 333        PCI_DEVICE_ID_NS_87560_LIO,
 334        PCI_DEVICE_ID_NS_87560_USB
 335};
 336#endif
 337
 338int superio_fixup_irq(struct pci_dev *pcidev)
 339{
 340        int local_irq, i;
 341
 342#ifdef DEBUG_SUPERIO_INIT
 343        int fn;
 344        fn = PCI_FUNC(pcidev->devfn);
 345
 346        /* Verify the function number matches the expected device id. */
 347        if (expected_device[fn] != pcidev->device) {
 348                BUG();
 349                return -1;
 350        }
 351        printk("superio_fixup_irq(%s) ven 0x%x dev 0x%x from %pf\n",
 352                pci_name(pcidev),
 353                pcidev->vendor, pcidev->device,
 354                __builtin_return_address(0));
 355#endif
 356
 357        for (i = 0; i < 16; i++) {
 358                irq_set_chip_and_handler(i, &superio_interrupt_type,
 359                                         handle_simple_irq);
 360        }
 361
 362        /*
 363         * We don't allocate a SuperIO irq for the legacy IO function,
 364         * since it is a "bridge". Instead, we will allocate irq's for
 365         * each legacy device as they are initialized.
 366         */
 367
 368        switch(pcidev->device) {
 369        case PCI_DEVICE_ID_NS_87415:            /* Function 0 */
 370                local_irq = IDE_IRQ;
 371                break;
 372        case PCI_DEVICE_ID_NS_87560_LIO:        /* Function 1 */
 373                sio_dev.lio_pdev = pcidev;      /* save for superio_init() */
 374                return -1;
 375        case PCI_DEVICE_ID_NS_87560_USB:        /* Function 2 */
 376                sio_dev.usb_pdev = pcidev;      /* save for superio_init() */
 377                local_irq = USB_IRQ;
 378                break;
 379        default:
 380                local_irq = -1;
 381                BUG();
 382                break;
 383        }
 384
 385        return local_irq;
 386}
 387
 388static void __init superio_serial_init(void)
 389{
 390#ifdef CONFIG_SERIAL_8250
 391        int retval;
 392        struct uart_port serial_port;
 393
 394        memset(&serial_port, 0, sizeof(serial_port));
 395        serial_port.iotype      = UPIO_PORT;
 396        serial_port.type        = PORT_16550A;
 397        serial_port.uartclk     = 115200*16;
 398        serial_port.fifosize    = 16;
 399
 400        /* serial port #1 */
 401        serial_port.iobase      = sio_dev.sp1_base;
 402        serial_port.irq         = SP1_IRQ;
 403        serial_port.line        = 0;
 404        retval = early_serial_setup(&serial_port);
 405        if (retval < 0) {
 406                printk(KERN_WARNING PFX "Register Serial #0 failed.\n");
 407                return;
 408        }
 409
 410        /* serial port #2 */
 411        serial_port.iobase      = sio_dev.sp2_base;
 412        serial_port.irq         = SP2_IRQ;
 413        serial_port.line        = 1;
 414        retval = early_serial_setup(&serial_port);
 415        if (retval < 0)
 416                printk(KERN_WARNING PFX "Register Serial #1 failed.\n");
 417#endif /* CONFIG_SERIAL_8250 */
 418}
 419
 420
 421static void __init superio_parport_init(void)
 422{
 423#ifdef CONFIG_PARPORT_PC
 424        if (!parport_pc_probe_port(sio_dev.pp_base,
 425                        0 /*base_hi*/,
 426                        PAR_IRQ, 
 427                        PARPORT_DMA_NONE /* dma */,
 428                        NULL /*struct pci_dev* */,
 429                        0 /* shared irq flags */))
 430
 431                printk(KERN_WARNING PFX "Probing parallel port failed.\n");
 432#endif  /* CONFIG_PARPORT_PC */
 433}
 434
 435
 436static void superio_fixup_pci(struct pci_dev *pdev)
 437{
 438        u8 prog;
 439
 440        pdev->class |= 0x5;
 441        pci_write_config_byte(pdev, PCI_CLASS_PROG, pdev->class);
 442
 443        pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
 444        printk("PCI: Enabled native mode for NS87415 (pif=0x%x)\n", prog);
 445}
 446DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415, superio_fixup_pci);
 447
 448
 449static int __init
 450superio_probe(struct pci_dev *dev, const struct pci_device_id *id)
 451{
 452        struct superio_device *sio = &sio_dev;
 453
 454        /*
 455        ** superio_probe(00:0e.0) ven 0x100b dev 0x2 sv 0x0 sd 0x0 class 0x1018a
 456        ** superio_probe(00:0e.1) ven 0x100b dev 0xe sv 0x0 sd 0x0 class 0x68000
 457        ** superio_probe(00:0e.2) ven 0x100b dev 0x12 sv 0x0 sd 0x0 class 0xc0310
 458        */
 459        DBG_INIT("superio_probe(%s) ven 0x%x dev 0x%x sv 0x%x sd 0x%x class 0x%x\n",
 460                pci_name(dev),
 461                dev->vendor, dev->device,
 462                dev->subsystem_vendor, dev->subsystem_device,
 463                dev->class);
 464
 465        BUG_ON(!sio->suckyio_irq_enabled);      /* Enabled by PCI_FIXUP_FINAL */
 466
 467        if (dev->device == PCI_DEVICE_ID_NS_87560_LIO) {        /* Function 1 */
 468                superio_parport_init();
 469                superio_serial_init();
 470                /* REVISIT XXX : superio_fdc_init() ? */
 471                return 0;
 472        } else if (dev->device == PCI_DEVICE_ID_NS_87415) {     /* Function 0 */
 473                DBG_INIT("superio_probe: ignoring IDE 87415\n");
 474        } else if (dev->device == PCI_DEVICE_ID_NS_87560_USB) { /* Function 2 */
 475                DBG_INIT("superio_probe: ignoring USB OHCI controller\n");
 476        } else {
 477                DBG_INIT("superio_probe: WTF? Fire Extinguisher?\n");
 478        }
 479
 480        /* Let appropriate other driver claim this device. */
 481        return -ENODEV;
 482}
 483
 484static const struct pci_device_id superio_tbl[] = {
 485        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_LIO) },
 486        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87560_USB) },
 487        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87415) },
 488        { 0, }
 489};
 490
 491static struct pci_driver superio_driver = {
 492        .name =         SUPERIO,
 493        .id_table =     superio_tbl,
 494        .probe =        superio_probe,
 495};
 496
 497static int __init superio_modinit(void)
 498{
 499        return pci_register_driver(&superio_driver);
 500}
 501
 502static void __exit superio_exit(void)
 503{
 504        pci_unregister_driver(&superio_driver);
 505}
 506
 507module_init(superio_modinit);
 508module_exit(superio_exit);
 509
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