// SPDX-License-Identifier: GPL-2.0-only
/* Low-level parallel-port routines for 8255-based PC-style hardware.
 *
 * Authors: Phil Blundell <philb@gnu.org>
 *          Tim Waugh <tim@cyberelk.demon.co.uk>
 *          Jose Renau <renau@acm.org>
 *          David Campbell
 *          Andrea Arcangeli
 *
 * based on work by Grant Guenther <grant@torque.net> and Phil Blundell.
 *
 * Cleaned up include files - Russell King <linux@arm.uk.linux.org>
 * DMA support - Bert De Jonghe <bert@sophis.be>
 * Many ECP bugs fixed.  Fred Barnes & Jamie Lokier, 1999
 * More PCI support now conditional on CONFIG_PCI, 03/2001, Paul G.
 * Various hacks, Fred Barnes, 04/2001
 * Updated probing logic - Adam Belay <ambx1@neo.rr.com>
 */

/* This driver should work with any hardware that is broadly compatible
 * with that in the IBM PC.  This applies to the majority of integrated
 * I/O chipsets that are commonly available.  The expected register
 * layout is:
 *
 *      base+0          data
 *      base+1          status
 *      base+2          control
 *
 * In addition, there are some optional registers:
 *
 *      base+3          EPP address
 *      base+4          EPP data
 *      base+0x400      ECP config A
 *      base+0x401      ECP config B
 *      base+0x402      ECP control
 *
 * All registers are 8 bits wide and read/write.  If your hardware differs
 * only in register addresses (eg because your registers are on 32-bit
 * word boundaries) then you can alter the constants in parport_pc.h to
 * accommodate this.
 *
 * Note that the ECP registers may not start at offset 0x400 for PCI cards,
 * but rather will start at port->base_hi.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched/signal.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/pnp.h>
#include <linux/platform_device.h>
#include <linux/sysctl.h>
#include <linux/io.h>
#include <linux/uaccess.h>

#include <asm/dma.h>

#include <linux/parport.h>
#include <linux/parport_pc.h>
#include <linux/via.h>
#include <asm/parport.h>

#define PARPORT_PC_MAX_PORTS PARPORT_MAX

#ifdef CONFIG_ISA_DMA_API
#define HAS_DMA
#endif

/* ECR modes */
#define ECR_SPP 00
#define ECR_PS2 01
#define ECR_PPF 02
#define ECR_ECP 03
#define ECR_EPP 04
#define ECR_VND 05
#define ECR_TST 06
#define ECR_CNF 07
#define ECR_MODE_MASK 0xe0
#define ECR_WRITE(p, v) frob_econtrol((p), 0xff, (v))

#undef DEBUG

#ifdef DEBUG
#define DPRINTK  printk
#else
#define DPRINTK(stuff...)
#endif


#define NR_SUPERIOS 3
static struct superio_struct {  /* For Super-IO chips autodetection */
        int io;
        int irq;
        int dma;
} superios[NR_SUPERIOS] = { {0,},};

static int user_specified;
#if defined(CONFIG_PARPORT_PC_SUPERIO) || \
       (defined(CONFIG_PARPORT_1284) && defined(CONFIG_PARPORT_PC_FIFO))
static int verbose_probing;
#endif
static int pci_registered_parport;
static int pnp_registered_parport;

/* frob_control, but for ECR */
static void frob_econtrol(struct parport *pb, unsigned char m,
                           unsigned char v)
{
        unsigned char ectr = 0;

        if (m != 0xff)
                ectr = inb(ECONTROL(pb));

        DPRINTK(KERN_DEBUG "frob_econtrol(%02x,%02x): %02x -> %02x\n",
                m, v, ectr, (ectr & ~m) ^ v);

        outb((ectr & ~m) ^ v, ECONTROL(pb));
}

static inline void frob_set_mode(struct parport *p, int mode)
{
        frob_econtrol(p, ECR_MODE_MASK, mode << 5);
}

#ifdef CONFIG_PARPORT_PC_FIFO
/* Safely change the mode bits in the ECR
   Returns:
            0    : Success
           -EBUSY: Could not drain FIFO in some finite amount of time,
                   mode not changed!
 */
static int change_mode(struct parport *p, int m)
{
        const struct parport_pc_private *priv = p->physport->private_data;
        unsigned char oecr;
        int mode;

        DPRINTK(KERN_INFO "parport change_mode ECP-ISA to mode 0x%02x\n", m);

        if (!priv->ecr) {
                printk(KERN_DEBUG "change_mode: but there's no ECR!\n");
                return 0;
        }

        /* Bits <7:5> contain the mode. */
        oecr = inb(ECONTROL(p));
        mode = (oecr >> 5) & 0x7;
        if (mode == m)
                return 0;

        if (mode >= 2 && !(priv->ctr & 0x20)) {
                /* This mode resets the FIFO, so we may
                 * have to wait for it to drain first. */
                unsigned long expire = jiffies + p->physport->cad->timeout;
                int counter;
                switch (mode) {
                case ECR_PPF: /* Parallel Port FIFO mode */
                case ECR_ECP: /* ECP Parallel Port mode */
                        /* Busy wait for 200us */
                        for (counter = 0; counter < 40; counter++) {
                                if (inb(ECONTROL(p)) & 0x01)
                                        break;
                                if (signal_pending(current))
                                        break;
                                udelay(5);
                        }

                        /* Poll slowly. */
                        while (!(inb(ECONTROL(p)) & 0x01)) {
                                if (time_after_eq(jiffies, expire))
                                        /* The FIFO is stuck. */
                                        return -EBUSY;
                                schedule_timeout_interruptible(
                                                        msecs_to_jiffies(10));
                                if (signal_pending(current))
                                        break;
                        }
                }
        }

        if (mode >= 2 && m >= 2) {
                /* We have to go through mode 001 */
                oecr &= ~(7 << 5);
                oecr |= ECR_PS2 << 5;
                ECR_WRITE(p, oecr);
        }

        /* Set the mode. */
        oecr &= ~(7 << 5);
        oecr |= m << 5;
        ECR_WRITE(p, oecr);
        return 0;
}
#endif /* FIFO support */

/*
 * Clear TIMEOUT BIT in EPP MODE
 *
 * This is also used in SPP detection.
 */
static int clear_epp_timeout(struct parport *pb)
{
        unsigned char r;

        if (!(parport_pc_read_status(pb) & 0x01))
                return 1;

        /* To clear timeout some chips require double read */
        parport_pc_read_status(pb);
        r = parport_pc_read_status(pb);
        outb(r | 0x01, STATUS(pb)); /* Some reset by writing 1 */
        outb(r & 0xfe, STATUS(pb)); /* Others by writing 0 */
        r = parport_pc_read_status(pb);

        return !(r & 0x01);
}

/*
 * Access functions.
 *
 * Most of these aren't static because they may be used by the
 * parport_xxx_yyy macros.  extern __inline__ versions of several
 * of these are in parport_pc.h.
 */

static void parport_pc_init_state(struct pardevice *dev,
                                                struct parport_state *s)
{
        s->u.pc.ctr = 0xc;
        if (dev->irq_func &&
            dev->port->irq != PARPORT_IRQ_NONE)
                /* Set ackIntEn */
                s->u.pc.ctr |= 0x10;

        s->u.pc.ecr = 0x34; /* NetMos chip can cause problems 0x24;
                             * D.Gruszka VScom */
}

static void parport_pc_save_state(struct parport *p, struct parport_state *s)
{
        const struct parport_pc_private *priv = p->physport->private_data;
        s->u.pc.ctr = priv->ctr;
        if (priv->ecr)
                s->u.pc.ecr = inb(ECONTROL(p));
}

static void parport_pc_restore_state(struct parport *p,
                                                struct parport_state *s)
{
        struct parport_pc_private *priv = p->physport->private_data;
        register unsigned char c = s->u.pc.ctr & priv->ctr_writable;
        outb(c, CONTROL(p));
        priv->ctr = c;
        if (priv->ecr)
                ECR_WRITE(p, s->u.pc.ecr);
}

#ifdef CONFIG_PARPORT_1284
static size_t parport_pc_epp_read_data(struct parport *port, void *buf,
                                       size_t length, int flags)
{
        size_t got = 0;

        if (flags & PARPORT_W91284PIC) {
                unsigned char status;
                size_t left = length;

                /* use knowledge about data lines..:
                 *  nFault is 0 if there is at least 1 byte in the Warp's FIFO
                 *  pError is 1 if there are 16 bytes in the Warp's FIFO
                 */
                status = inb(STATUS(port));

                while (!(status & 0x08) && got < length) {
                        if (left >= 16 && (status & 0x20) && !(status & 0x08)) {
                                /* can grab 16 bytes from warp fifo */
                                if (!((long)buf & 0x03))
                                        insl(EPPDATA(port), buf, 4);
                                else
                                        insb(EPPDATA(port), buf, 16);
                                buf += 16;
                                got += 16;
                                left -= 16;
                        } else {
                                /* grab single byte from the warp fifo */
                                *((char *)buf) = inb(EPPDATA(port));
                                buf++;
                                got++;
                                left--;
                        }
                        status = inb(STATUS(port));
                        if (status & 0x01) {
                                /* EPP timeout should never occur... */
                                printk(KERN_DEBUG
"%s: EPP timeout occurred while talking to w91284pic (should not have done)\n", port->name);
                                clear_epp_timeout(port);
                        }
                }
                return got;
        }
        if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
                if (!(((long)buf | length) & 0x03))
                        insl(EPPDATA(port), buf, (length >> 2));
                else
                        insb(EPPDATA(port), buf, length);
                if (inb(STATUS(port)) & 0x01) {
                        clear_epp_timeout(port);
                        return -EIO;
                }
                return length;
        }
        for (; got < length; got++) {
                *((char *)buf) = inb(EPPDATA(port));
                buf++;
                if (inb(STATUS(port)) & 0x01) {
                        /* EPP timeout */
                        clear_epp_timeout(port);
                        break;
                }
        }

        return got;
}

static size_t parport_pc_epp_write_data(struct parport *port, const void *buf,
                                        size_t length, int flags)
{
        size_t written = 0;

        if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
                if (!(((long)buf | length) & 0x03))
                        outsl(EPPDATA(port), buf, (length >> 2));
                else
                        outsb(EPPDATA(port), buf, length);
                if (inb(STATUS(port)) & 0x01) {
                        clear_epp_timeout(port);
                        return -EIO;
                }
                return length;
        }
        for (; written < length; written++) {
                outb(*((char *)buf), EPPDATA(port));
                buf++;
                if (inb(STATUS(port)) & 0x01) {
                        clear_epp_timeout(port);
                        break;
                }
        }

        return written;
}

static size_t parport_pc_epp_read_addr(struct parport *port, void *buf,
                                        size_t length, int flags)
{
        size_t got = 0;

        if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
                insb(EPPADDR(port), buf, length);
                if (inb(STATUS(port)) & 0x01) {
                        clear_epp_timeout(port);
                        return -EIO;
                }
                return length;
        }
        for (; got < length; got++) {
                *((char *)buf) = inb(EPPADDR(port));
                buf++;
                if (inb(STATUS(port)) & 0x01) {
                        clear_epp_timeout(port);
                        break;
                }
        }

        return got;
}

static size_t parport_pc_epp_write_addr(struct parport *port,
                                         const void *buf, size_t length,
                                         int flags)
{
        size_t written = 0;

        if ((flags & PARPORT_EPP_FAST) && (length > 1)) {
                outsb(EPPADDR(port), buf, length);
                if (inb(STATUS(port)) & 0x01) {
                        clear_epp_timeout(port);
                        return -EIO;
                }
                return length;
        }
        for (; written < length; written++) {
                outb(*((char *)buf), EPPADDR(port));
                buf++;
                if (inb(STATUS(port)) & 0x01) {
                        clear_epp_timeout(port);
                        break;
                }
        }

        return written;
}

static size_t parport_pc_ecpepp_read_data(struct parport *port, void *buf,
                                          size_t length, int flags)
{
        size_t got;

        frob_set_mode(port, ECR_EPP);
        parport_pc_data_reverse(port);
        parport_pc_write_control(port, 0x4);
        got = parport_pc_epp_read_data(port, buf, length, flags);
        frob_set_mode(port, ECR_PS2);

        return got;
}

static size_t parport_pc_ecpepp_write_data(struct parport *port,
                                           const void *buf, size_t length,
                                           int flags)
{
        size_t written;

        frob_set_mode(port, ECR_EPP);
        parport_pc_write_control(port, 0x4);
        parport_pc_data_forward(port);
        written = parport_pc_epp_write_data(port, buf, length, flags);
        frob_set_mode(port, ECR_PS2);

        return written;
}

static size_t parport_pc_ecpepp_read_addr(struct parport *port, void *buf,
                                          size_t length, int flags)
{
        size_t got;

        frob_set_mode(port, ECR_EPP);
        parport_pc_data_reverse(port);
        parport_pc_write_control(port, 0x4);
        got = parport_pc_epp_read_addr(port, buf, length, flags);
        frob_set_mode(port, ECR_PS2);

        return got;
}

static size_t parport_pc_ecpepp_write_addr(struct parport *port,
                                            const void *buf, size_t length,
                                            int flags)
{
        size_t written;

        frob_set_mode(port, ECR_EPP);
        parport_pc_write_control(port, 0x4);
        parport_pc_data_forward(port);
        written = parport_pc_epp_write_addr(port, buf, length, flags);
        frob_set_mode(port, ECR_PS2);

        return written;
}
#endif /* IEEE 1284 support */

#ifdef CONFIG_PARPORT_PC_FIFO
static size_t parport_pc_fifo_write_block_pio(struct parport *port,
                                               const void *buf, size_t length)
{
        int ret = 0;
        const unsigned char *bufp = buf;
        size_t left = length;
        unsigned long expire = jiffies + port->physport->cad->timeout;
        const int fifo = FIFO(port);
        int poll_for = 8; /* 80 usecs */
        const struct parport_pc_private *priv = port->physport->private_data;
        const int fifo_depth = priv->fifo_depth;

        port = port->physport;

        /* We don't want to be interrupted every character. */
        parport_pc_disable_irq(port);
        /* set nErrIntrEn and serviceIntr */
        frob_econtrol(port, (1<<4) | (1<<2), (1<<4) | (1<<2));

        /* Forward mode. */
        parport_pc_data_forward(port); /* Must be in PS2 mode */

        while (left) {
                unsigned char byte;
                unsigned char ecrval = inb(ECONTROL(port));
                int i = 0;

                if (need_resched() && time_before(jiffies, expire))
                        /* Can't yield the port. */
                        schedule();

                /* Anyone else waiting for the port? */
                if (port->waithead) {
                        printk(KERN_DEBUG "Somebody wants the port\n");
                        break;
                }

                if (ecrval & 0x02) {
                        /* FIFO is full. Wait for interrupt. */

                        /* Clear serviceIntr */
                        ECR_WRITE(port, ecrval & ~(1<<2));
false_alarm:
                        ret = parport_wait_event(port, HZ);
                        if (ret < 0)
                                break;
                        ret = 0;
                        if (!time_before(jiffies, expire)) {
                                /* Timed out. */
                                printk(KERN_DEBUG "FIFO write timed out\n");
                                break;
                        }
                        ecrval = inb(ECONTROL(port));
                        if (!(ecrval & (1<<2))) {
                                if (need_resched() &&
                                    time_before(jiffies, expire))
                                        schedule();

                                goto false_alarm;
                        }

                        continue;
                }

                /* Can't fail now. */
                expire = jiffies + port->cad->timeout;

poll:
                if (signal_pending(current))
                        break;

                if (ecrval & 0x01) {
                        /* FIFO is empty. Blast it full. */
                        const int n = left < fifo_depth ? left : fifo_depth;
                        outsb(fifo, bufp, n);
                        bufp += n;
                        left -= n;

                        /* Adjust the poll time. */
                        if (i < (poll_for - 2))
                                poll_for--;
                        continue;
                } else if (i++ < poll_for) {
                        udelay(10);
                        ecrval = inb(ECONTROL(port));
                        goto poll;
                }

                /* Half-full(call me an optimist) */
                byte = *bufp++;
                outb(byte, fifo);
                left--;
        }
        dump_parport_state("leave fifo_write_block_pio", port);
        return length - left;
}

#ifdef HAS_DMA
static size_t parport_pc_fifo_write_block_dma(struct parport *port,
                                               const void *buf, size_t length)
{
        int ret = 0;
        unsigned long dmaflag;
        size_t left = length;
        const struct parport_pc_private *priv = port->physport->private_data;
        struct device *dev = port->physport->dev;
        dma_addr_t dma_addr, dma_handle;
        size_t maxlen = 0x10000; /* max 64k per DMA transfer */
        unsigned long start = (unsigned long) buf;
        unsigned long end = (unsigned long) buf + length - 1;

        dump_parport_state("enter fifo_write_block_dma", port);
        if (end < MAX_DMA_ADDRESS) {
                /* If it would cross a 64k boundary, cap it at the end. */
                if ((start ^ end) & ~0xffffUL)
                        maxlen = 0x10000 - (start & 0xffff);

                dma_addr = dma_handle = dma_map_single(dev, (void *)buf, length,
                                                       DMA_TO_DEVICE);
        } else {
                /* above 16 MB we use a bounce buffer as ISA-DMA
                   is not possible */
                maxlen   = PAGE_SIZE;          /* sizeof(priv->dma_buf) */
                dma_addr = priv->dma_handle;
                dma_handle = 0;
        }

        port = port->physport;

        /* We don't want to be interrupted every character. */
        parport_pc_disable_irq(port);
        /* set nErrIntrEn and serviceIntr */
        frob_econtrol(port, (1<<4) | (1<<2), (1<<4) | (1<<2));

        /* Forward mode. */
        parport_pc_data_forward(port); /* Must be in PS2 mode */

        while (left) {
                unsigned long expire = jiffies + port->physport->cad->timeout;

                size_t count = left;

                if (count > maxlen)
                        count = maxlen;

                if (!dma_handle)   /* bounce buffer ! */
                        memcpy(priv->dma_buf, buf, count);

                dmaflag = claim_dma_lock();
                disable_dma(port->dma);
                clear_dma_ff(port->dma);
                set_dma_mode(port->dma, DMA_MODE_WRITE);
                set_dma_addr(port->dma, dma_addr);
                set_dma_count(port->dma, count);

                /* Set DMA mode */
                frob_econtrol(port, 1<<3, 1<<3);

                /* Clear serviceIntr */
                frob_econtrol(port, 1<<2, 0);

                enable_dma(port->dma);
                release_dma_lock(dmaflag);

                /* assume DMA will be successful */
                left -= count;
                buf  += count;
                if (dma_handle)
                        dma_addr += count;

                /* Wait for interrupt. */
false_alarm:
                ret = parport_wait_event(port, HZ);
                if (ret < 0)
                        break;
                ret = 0;
                if (!time_before(jiffies, expire)) {
                        /* Timed out. */
                        printk(KERN_DEBUG "DMA write timed out\n");
                        break;
                }
                /* Is serviceIntr set? */
                if (!(inb(ECONTROL(port)) & (1<<2))) {
                        cond_resched();

                        goto false_alarm;
                }

                dmaflag = claim_dma_lock();
                disable_dma(port->dma);
                clear_dma_ff(port->dma);
                count = get_dma_residue(port->dma);
                release_dma_lock(dmaflag);

                cond_resched(); /* Can't yield the port. */

                /* Anyone else waiting for the port? */
                if (port->waithead) {
                        printk(KERN_DEBUG "Somebody wants the port\n");
                        break;
                }

                /* update for possible DMA residue ! */
                buf  -= count;
                left += count;
                if (dma_handle)
                        dma_addr -= count;
        }

        /* Maybe got here through break, so adjust for DMA residue! */
        dmaflag = claim_dma_lock();
        disable_dma(port->dma);
        clear_dma_ff(port->dma);
        left += get_dma_residue(port->dma);
        release_dma_lock(dmaflag);

        /* Turn off DMA mode */
        frob_econtrol(port, 1<<3, 0);

        if (dma_handle)
                dma_unmap_single(dev, dma_handle, length, DMA_TO_DEVICE);

        dump_parport_state("leave fifo_write_block_dma", port);
        return length - left;
}
#endif

static inline size_t parport_pc_fifo_write_block(struct parport *port,
                                               const void *buf, size_t length)
{
#ifdef HAS_DMA
        if (port->dma != PARPORT_DMA_NONE)
                return parport_pc_fifo_write_block_dma(port, buf, length);
#endif
        return parport_pc_fifo_write_block_pio(port, buf, length);
}

/* Parallel Port FIFO mode (ECP chipsets) */
static size_t parport_pc_compat_write_block_pio(struct parport *port,
                                                 const void *buf, size_t length,
                                                 int flags)
{
        size_t written;
        int r;
        unsigned long expire;
        const struct parport_pc_private *priv = port->physport->private_data;

        /* Special case: a timeout of zero means we cannot call schedule().
         * Also if O_NONBLOCK is set then use the default implementation. */
        if (port->physport->cad->timeout <= PARPORT_INACTIVITY_O_NONBLOCK)
                return parport_ieee1284_write_compat(port, buf,
                                                      length, flags);

        /* Set up parallel port FIFO mode.*/
        parport_pc_data_forward(port); /* Must be in PS2 mode */
        parport_pc_frob_control(port, PARPORT_CONTROL_STROBE, 0);
        r = change_mode(port, ECR_PPF); /* Parallel port FIFO */
        if (r)
                printk(KERN_DEBUG "%s: Warning change_mode ECR_PPF failed\n",
                                                                port->name);

        port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;

        /* Write the data to the FIFO. */
        written = parport_pc_fifo_write_block(port, buf, length);

        /* Finish up. */
        /* For some hardware we don't want to touch the mode until
         * the FIFO is empty, so allow 4 seconds for each position
         * in the fifo.
         */
        expire = jiffies + (priv->fifo_depth * HZ * 4);
        do {
                /* Wait for the FIFO to empty */
                r = change_mode(port, ECR_PS2);
                if (r != -EBUSY)
                        break;
        } while (time_before(jiffies, expire));
        if (r == -EBUSY) {

                printk(KERN_DEBUG "%s: FIFO is stuck\n", port->name);

                /* Prevent further data transfer. */
                frob_set_mode(port, ECR_TST);

                /* Adjust for the contents of the FIFO. */
                for (written -= priv->fifo_depth; ; written++) {
                        if (inb(ECONTROL(port)) & 0x2) {
                                /* Full up. */
                                break;
                        }
                        outb(0, FIFO(port));
                }

                /* Reset the FIFO and return to PS2 mode. */
                frob_set_mode(port, ECR_PS2);
        }

        r = parport_wait_peripheral(port,
                                     PARPORT_STATUS_BUSY,
                                     PARPORT_STATUS_BUSY);
        if (r)
                printk(KERN_DEBUG
                        "%s: BUSY timeout (%d) in compat_write_block_pio\n",
                        port->name, r);

        port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;

        return written;
}

/* ECP */
#ifdef CONFIG_PARPORT_1284
static size_t parport_pc_ecp_write_block_pio(struct parport *port,
                                              const void *buf, size_t length,
                                              int flags)
{
        size_t written;
        int r;
        unsigned long expire;
        const struct parport_pc_private *priv = port->physport->private_data;

        /* Special case: a timeout of zero means we cannot call schedule().
         * Also if O_NONBLOCK is set then use the default implementation. */
        if (port->physport->cad->timeout <= PARPORT_INACTIVITY_O_NONBLOCK)
                return parport_ieee1284_ecp_write_data(port, buf,
                                                        length, flags);

        /* Switch to forward mode if necessary. */
        if (port->physport->ieee1284.phase != IEEE1284_PH_FWD_IDLE) {
                /* Event 47: Set nInit high. */
                parport_frob_control(port,
                                      PARPORT_CONTROL_INIT
                                      | PARPORT_CONTROL_AUTOFD,
                                      PARPORT_CONTROL_INIT
                                      | PARPORT_CONTROL_AUTOFD);

                /* Event 49: PError goes high. */
                r = parport_wait_peripheral(port,
                                             PARPORT_STATUS_PAPEROUT,
                                             PARPORT_STATUS_PAPEROUT);
                if (r) {
                        printk(KERN_DEBUG "%s: PError timeout (%d) "
                                "in ecp_write_block_pio\n", port->name, r);
                }
        }

        /* Set up ECP parallel port mode.*/
        parport_pc_data_forward(port); /* Must be in PS2 mode */
        parport_pc_frob_control(port,
                                 PARPORT_CONTROL_STROBE |
                                 PARPORT_CONTROL_AUTOFD,
                                 0);
        r = change_mode(port, ECR_ECP); /* ECP FIFO */
        if (r)
                printk(KERN_DEBUG "%s: Warning change_mode ECR_ECP failed\n",
                                                                port->name);
        port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;

        /* Write the data to the FIFO. */
        written = parport_pc_fifo_write_block(port, buf, length);

        /* Finish up. */
        /* For some hardware we don't want to touch the mode until
         * the FIFO is empty, so allow 4 seconds for each position
         * in the fifo.
         */
        expire = jiffies + (priv->fifo_depth * (HZ * 4));
        do {
                /* Wait for the FIFO to empty */
                r = change_mode(port, ECR_PS2);
                if (r != -EBUSY)
                        break;
        } while (time_before(jiffies, expire));
        if (r == -EBUSY) {

                printk(KERN_DEBUG "%s: FIFO is stuck\n", port->name);

                /* Prevent further data transfer. */
                frob_set_mode(port, ECR_TST);

                /* Adjust for the contents of the FIFO. */
                for (written -= priv->fifo_depth; ; written++) {
                        if (inb(ECONTROL(port)) & 0x2) {
                                /* Full up. */
                                break;
                        }
                        outb(0, FIFO(port));
                }

                /* Reset the FIFO and return to PS2 mode. */
                frob_set_mode(port, ECR_PS2);

                /* Host transfer recovery. */
                parport_pc_data_reverse(port); /* Must be in PS2 mode */
                udelay(5);
                parport_frob_control(port, PARPORT_CONTROL_INIT, 0);
                r = parport_wait_peripheral(port, PARPORT_STATUS_PAPEROUT, 0);
                if (r)
                        printk(KERN_DEBUG "%s: PE,1 timeout (%d) "
                                "in ecp_write_block_pio\n", port->name, r);

                parport_frob_control(port,
                                      PARPORT_CONTROL_INIT,
                                      PARPORT_CONTROL_INIT);
                r = parport_wait_peripheral(port,
                                             PARPORT_STATUS_PAPEROUT,
                                             PARPORT_STATUS_PAPEROUT);
                if (r)
                        printk(KERN_DEBUG "%s: PE,2 timeout (%d) "
                                "in ecp_write_block_pio\n", port->name, r);
        }

        r = parport_wait_peripheral(port,
                                     PARPORT_STATUS_BUSY,
                                     PARPORT_STATUS_BUSY);
        if (r)
                printk(KERN_DEBUG
                        "%s: BUSY timeout (%d) in ecp_write_block_pio\n",
                        port->name, r);

        port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;

        return written;
}
#endif /* IEEE 1284 support */
#endif /* Allowed to use FIFO/DMA */


/*
 *      ******************************************
 *      INITIALISATION AND MODULE STUFF BELOW HERE
 *      ******************************************
 */

/* GCC is not inlining extern inline function later overwritten to non-inline,
   so we use outlined_ variants here.  */
static const struct parport_operations parport_pc_ops = {
        .write_data     = parport_pc_write_data,
        .read_data      = parport_pc_read_data,

        .write_control  = parport_pc_write_control,
        .read_control   = parport_pc_read_control,
        .frob_control   = parport_pc_frob_control,

        .read_status    = parport_pc_read_status,

        .enable_irq     = parport_pc_enable_irq,
        .disable_irq    = parport_pc_disable_irq,

        .data_forward   = parport_pc_data_forward,
        .data_reverse   = parport_pc_data_reverse,

        .init_state     = parport_pc_init_state,
        .save_state     = parport_pc_save_state,
        .restore_state  = parport_pc_restore_state,

        .epp_write_data = parport_ieee1284_epp_write_data,
        .epp_read_data  = parport_ieee1284_epp_read_data,
        .epp_write_addr = parport_ieee1284_epp_write_addr,
        .epp_read_addr  = parport_ieee1284_epp_read_addr,

        .ecp_write_data = parport_ieee1284_ecp_write_data,
        .ecp_read_data  = parport_ieee1284_ecp_read_data,
        .ecp_write_addr = parport_ieee1284_ecp_write_addr,

        .compat_write_data      = parport_ieee1284_write_compat,
        .nibble_read_data       = parport_ieee1284_read_nibble,
        .byte_read_data         = parport_ieee1284_read_byte,

        .owner          = THIS_MODULE,
};

#ifdef CONFIG_PARPORT_PC_SUPERIO

static struct superio_struct *find_free_superio(void)
{
        int i;
        for (i = 0; i < NR_SUPERIOS; i++)
                if (superios[i].io == 0)
                        return &superios[i];
        return NULL;
}


/* Super-IO chipset detection, Winbond, SMSC */
static void show_parconfig_smsc37c669(int io, int key)
{
        int cr1, cr4, cra, cr23, cr26, cr27;
        struct superio_struct *s;

        static const char *const modes[] = {
                "SPP and Bidirectional (PS/2)",
                "EPP and SPP",
                "ECP",
                "ECP and EPP" };

        outb(key, io);
        outb(key, io);
        outb(1, io);
        cr1 = inb(io + 1);
        outb(4, io);
        cr4 = inb(io + 1);
        outb(0x0a, io);
        cra = inb(io + 1);
        outb(0x23, io);
        cr23 = inb(io + 1);
        outb(0x26, io);
        cr26 = inb(io + 1);
        outb(0x27, io);
        cr27 = inb(io + 1);
        outb(0xaa, io);

        if (verbose_probing) {
                printk(KERN_INFO
                        "SMSC 37c669 LPT Config: cr_1=0x%02x, 4=0x%02x, "
                        "A=0x%2x, 23=0x%02x, 26=0x%02x, 27=0x%02x\n",
                        cr1, cr4, cra, cr23, cr26, cr27);

                /* The documentation calls DMA and IRQ-Lines by letters, so
                   the board maker can/will wire them
                   appropriately/randomly...  G=reserved H=IDE-irq, */
                printk(KERN_INFO
        "SMSC LPT Config: io=0x%04x, irq=%c, dma=%c, fifo threshold=%d\n",
                                cr23 * 4,
                                (cr27 & 0x0f) ? 'A' - 1 + (cr27 & 0x0f) : '-',
                                (cr26 & 0x0f) ? 'A' - 1 + (cr26 & 0x0f) : '-',
                                cra & 0x0f);
                printk(KERN_INFO "SMSC LPT Config: enabled=%s power=%s\n",
                       (cr23 * 4 >= 0x100) ? "yes" : "no",

                       (cr1 & 4) ? "yes" : "no");
                printk(KERN_INFO
                        "SMSC LPT Config: Port mode=%s, EPP version =%s\n",
                                (cr1 & 0x08) ? "Standard mode only (SPP)"
                                              : modes[cr4 & 0x03],
                                (cr4 & 0x40) ? "1.7" : "1.9");
        }

        /* Heuristics !  BIOS setup for this mainboard device limits
           the choices to standard settings, i.e. io-address and IRQ
           are related, however DMA can be 1 or 3, assume DMA_A=DMA1,
           DMA_C=DMA3 (this is true e.g. for TYAN 1564D Tomcat IV) */
        if (cr23 * 4 >= 0x100) { /* if active */
                s = find_free_superio();
                if (s == NULL)
                        printk(KERN_INFO "Super-IO: too many chips!\n");
                else {
                        int d;
                        switch (cr23 * 4) {
                        case 0x3bc:
                                s->io = 0x3bc;
                                s->irq = 7;
                                break;
                        case 0x378:
                                s->io = 0x378;
                                s->irq = 7;
                                break;
                        case 0x278:
                                s->io = 0x278;
                                s->irq = 5;
                        }
                        d = (cr26 & 0x0f);
                        if (d == 1 || d == 3)
                                s->dma = d;
                        else
                                s->dma = PARPORT_DMA_NONE;
                }
        }
}


static void show_parconfig_winbond(int io, int key)
{
        int cr30, cr60, cr61, cr70, cr74, crf0;
        struct superio_struct *s;
        static const char *const modes[] = {
                "Standard (SPP) and Bidirectional(PS/2)", /* 0 */
                "EPP-1.9 and SPP",
                "ECP",
                "ECP and EPP-1.9",
                "Standard (SPP)",
                "EPP-1.7 and SPP",              /* 5 */
                "undefined!",
                "ECP and EPP-1.7" };
        static char *const irqtypes[] = {
                "pulsed low, high-Z",
                "follows nACK" };

        /* The registers are called compatible-PnP because the
           register layout is modelled after ISA-PnP, the access
           method is just another ... */
        outb(key, io);
        outb(key, io);
        outb(0x07, io);   /* Register 7: Select Logical Device */
        outb(0x01, io + 1); /* LD1 is Parallel Port */
        outb(0x30, io);
        cr30 = inb(io + 1);
        outb(0x60, io);
        cr60 = inb(io + 1);
        outb(0x61, io);
        cr61 = inb(io + 1);
        outb(0x70, io);
        cr70 = inb(io + 1);
        outb(0x74, io);
        cr74 = inb(io + 1);
        outb(0xf0, io);
        crf0 = inb(io + 1);
        outb(0xaa, io);

        if (verbose_probing) {
                printk(KERN_INFO
    "Winbond LPT Config: cr_30=%02x 60,61=%02x%02x 70=%02x 74=%02x, f0=%02x\n",
                                        cr30, cr60, cr61, cr70, cr74, crf0);
                printk(KERN_INFO "Winbond LPT Config: active=%s, io=0x%02x%02x irq=%d, ",
                       (cr30 & 0x01) ? "yes" : "no", cr60, cr61, cr70 & 0x0f);
                if ((cr74 & 0x07) > 3)
                        pr_cont("dma=none\n");
                else
                        pr_cont("dma=%d\n", cr74 & 0x07);
                printk(KERN_INFO
                    "Winbond LPT Config: irqtype=%s, ECP fifo threshold=%d\n",
                                        irqtypes[crf0>>7], (crf0>>3)&0x0f);
                printk(KERN_INFO "Winbond LPT Config: Port mode=%s\n",
                                        modes[crf0 & 0x07]);
        }

        if (cr30 & 0x01) { /* the settings can be interrogated later ... */
                s = find_free_superio();
                if (s == NULL)
                        printk(KERN_INFO "Super-IO: too many chips!\n");
                else {
                        s->io = (cr60 << 8) | cr61;
                        s->irq = cr70 & 0x0f;
                        s->dma = (((cr74 & 0x07) > 3) ?
                                           PARPORT_DMA_NONE : (cr74 & 0x07));
                }
        }
}

static void decode_winbond(int efer, int key, int devid, int devrev, int oldid)
{
        const char *type = "unknown";
        int id, progif = 2;

        if (devid == devrev)
                /* simple heuristics, we happened to read some
                   non-winbond register */
                return;

        id = (devid << 8) | devrev;

        /* Values are from public data sheets pdf files, I can just
           confirm 83977TF is correct :-) */
        if (id == 0x9771)
                type = "83977F/AF";
        else if (id == 0x9773)
                type = "83977TF / SMSC 97w33x/97w34x";
        else if (id == 0x9774)
                type = "83977ATF";
        else if ((id & ~0x0f) == 0x5270)
                type = "83977CTF / SMSC 97w36x";
        else if ((id & ~0x0f) == 0x52f0)
                type = "83977EF / SMSC 97w35x";
        else if ((id & ~0x0f) == 0x5210)
                type = "83627";
        else if ((id & ~0x0f) == 0x6010)
                type = "83697HF";
        else if ((oldid & 0x0f) == 0x0a) {
                type = "83877F";
                progif = 1;
        } else if ((oldid & 0x0f) == 0x0b) {
                type = "83877AF";
                progif = 1;
        } else if ((oldid & 0x0f) == 0x0c) {
                type = "83877TF";
                progif = 1;
        } else if ((oldid & 0x0f) == 0x0d) {
                type = "83877ATF";
                progif = 1;
        } else
                progif = 0;

        if (verbose_probing)
                printk(KERN_INFO "Winbond chip at EFER=0x%x key=0x%02x "
                       "devid=%02x devrev=%02x oldid=%02x type=%s\n",
                       efer, key, devid, devrev, oldid, type);

        if (progif == 2)
                show_parconfig_winbond(efer, key);
}

static void decode_smsc(int efer, int key, int devid, int devrev)
{
        const char *type = "unknown";
        void (*func)(int io, int key);
        int id;

        if (devid == devrev)
                /* simple heuristics, we happened to read some
                   non-smsc register */
                return;

        func = NULL;
        id = (devid << 8) | devrev;

        if (id == 0x0302) {
                type = "37c669";
                func = show_parconfig_smsc37c669;
        } else if (id == 0x6582)
                type = "37c665IR";
        else if (devid == 0x65)
                type = "37c665GT";
        else if (devid == 0x66)
                type = "37c666GT";

        if (verbose_probing)
                printk(KERN_INFO "SMSC chip at EFER=0x%x "
                       "key=0x%02x devid=%02x devrev=%02x type=%s\n",
                       efer, key, devid, devrev, type);

        if (func)
                func(efer, key);
}


static void winbond_check(int io, int key)
{
        int origval, devid, devrev, oldid, x_devid, x_devrev, x_oldid;

        if (!request_region(io, 3, __func__))
                return;

        origval = inb(io); /* Save original value */

        /* First probe without key */
        outb(0x20, io);
        x_devid = inb(io + 1);
        outb(0x21, io);
        x_devrev = inb(io + 1);
        outb(0x09, io);
        x_oldid = inb(io + 1);

        outb(key, io);
        outb(key, io);     /* Write Magic Sequence to EFER, extended
                              function enable register */
        outb(0x20, io);    /* Write EFIR, extended function index register */
        devid = inb(io + 1);  /* Read EFDR, extended function data register */
        outb(0x21, io);
        devrev = inb(io + 1);
        outb(0x09, io);
        oldid = inb(io + 1);
        outb(0xaa, io);    /* Magic Seal */

        outb(origval, io); /* in case we poked some entirely different hardware */

        if ((x_devid == devid) && (x_devrev == devrev) && (x_oldid == oldid))
                goto out; /* protection against false positives */

        decode_winbond(io, key, devid, devrev, oldid);
out:
        release_region(io, 3);
}

static void winbond_check2(int io, int key)
{
        int origval[3], devid, devrev, oldid, x_devid, x_devrev, x_oldid;

        if (!request_region(io, 3, __func__))
                return;

        origval[0] = inb(io); /* Save original values */
        origval[1] = inb(io + 1);
        origval[2] = inb(io + 2);

        /* First probe without the key */
        outb(0x20, io + 2);
        x_devid = inb(io + 2);
        outb(0x21, io + 1);
        x_devrev = inb(io + 2);
        outb(0x09, io + 1);
        x_oldid = inb(io + 2);

        outb(key, io);     /* Write Magic Byte to EFER, extended
                              function enable register */
        outb(0x20, io + 2);  /* Write EFIR, extended function index register */
        devid = inb(io + 2);  /* Read EFDR, extended function data register */
        outb(0x21, io + 1);
        devrev = inb(io + 2);
        outb(0x09, io + 1);
        oldid = inb(io + 2);
        outb(0xaa, io);    /* Magic Seal */

        outb(origval[0], io); /* in case we poked some entirely different hardware */
        outb(origval[1], io + 1);
        outb(origval[2], io + 2);

        if (x_devid == devid && x_devrev == devrev && x_oldid == oldid)
                goto out; /* protection against false positives */

        decode_winbond(io, key, devid, devrev, oldid);
out:
        release_region(io, 3);
}

static void smsc_check(int io, int key)
{
        int origval, id, rev, oldid, oldrev, x_id, x_rev, x_oldid, x_oldrev;

        if (!request_region(io, 3, __func__))
                return;

        origval = inb(io); /* Save original value */

        /* First probe without the key */
        outb(0x0d, io);
        x_oldid = inb(io + 1);
        outb(0x0e, io);
        x_oldrev = inb(io + 1);
        outb(0x20, io);
        x_id = inb(io + 1);
        outb(0x21, io);
        x_rev = inb(io + 1);

        outb(key, io);
        outb(key, io);     /* Write Magic Sequence to EFER, extended
                              function enable register */
        outb(0x0d, io);    /* Write EFIR, extended function index register */
        oldid = inb(io + 1);  /* Read EFDR, extended function data register */
        outb(0x0e, io);
        oldrev = inb(io + 1);
        outb(0x20, io);
        id = inb(io + 1);
        outb(0x21, io);
        rev = inb(io + 1);
        outb(0xaa, io);    /* Magic Seal */

        outb(origval, io); /* in case we poked some entirely different hardware */

        if (x_id == id && x_oldrev == oldrev &&
            x_oldid == oldid && x_rev == rev)
                goto out; /* protection against false positives */

        decode_smsc(io, key, oldid, oldrev);
out:
        release_region(io, 3);
}


static void detect_and_report_winbond(void)
{
        if (verbose_probing)
                printk(KERN_DEBUG "Winbond Super-IO detection, now testing ports 3F0,370,250,4E,2E ...\n");
        winbond_check(0x3f0, 0x87);
        winbond_check(0x370, 0x87);
        winbond_check(0x2e , 0x87);
        winbond_check(0x4e , 0x87);
        winbond_check(0x3f0, 0x86);
        winbond_check2(0x250, 0x88);
        winbond_check2(0x250, 0x89);
}

static void detect_and_report_smsc(void)
{
        if (verbose_probing)
                printk(KERN_DEBUG "SMSC Super-IO detection, now testing Ports 2F0, 370 ...\n");
        smsc_check(0x3f0, 0x55);
        smsc_check(0x370, 0x55);
        smsc_check(0x3f0, 0x44);
        smsc_check(0x370, 0x44);
}

static void detect_and_report_it87(void)
{
        u16 dev;
        u8 origval, r;
        if (verbose_probing)
                printk(KERN_DEBUG "IT8705 Super-IO detection, now testing port 2E ...\n");
        if (!request_muxed_region(0x2e, 2, __func__))
                return;
        origval = inb(0x2e);            /* Save original value */
        outb(0x87, 0x2e);
        outb(0x01, 0x2e);
        outb(0x55, 0x2e);
        outb(0x55, 0x2e);
        outb(0x20, 0x2e);
        dev = inb(0x2f) << 8;
        outb(0x21, 0x2e);
        dev |= inb(0x2f);
        if (dev == 0x8712 || dev == 0x8705 || dev == 0x8715 ||
            dev == 0x8716 || dev == 0x8718 || dev == 0x8726) {
                printk(KERN_INFO "IT%04X SuperIO detected.\n", dev);
                outb(0x07, 0x2E);       /* Parallel Port */
                outb(0x03, 0x2F);
                outb(0xF0, 0x2E);       /* BOOT 0x80 off */
                r = inb(0x2f);
                outb(0xF0, 0x2E);
                outb(r | 8, 0x2F);
                outb(0x02, 0x2E);       /* Lock */
                outb(0x02, 0x2F);
        } else {
                outb(origval, 0x2e);    /* Oops, sorry to disturb */
        }
        release_region(0x2e, 2);
}
#endif /* CONFIG_PARPORT_PC_SUPERIO */

static struct superio_struct *find_superio(struct parport *p)
{
        int i;
        for (i = 0; i < NR_SUPERIOS; i++)
                if (superios[i].io == p->base)
                        return &superios[i];
        return NULL;
}

static int get_superio_dma(struct parport *p)
{
        struct superio_struct *s = find_superio(p);
        if (s)
                return s->dma;
        return PARPORT_DMA_NONE;
}

static int get_superio_irq(struct parport *p)
{
        struct superio_struct *s = find_superio(p);
        if (s)
                return s->irq;
        return PARPORT_IRQ_NONE;
}


/* --- Mode detection ------------------------------------- */

/*
 * Checks for port existence, all ports support SPP MODE
 * Returns:
 *         0           :  No parallel port at this address
 *  PARPORT_MODE_PCSPP :  SPP port detected
 *                        (if the user specified an ioport himself,
 *                         this shall always be the case!)
 *
 */
static int parport_SPP_supported(struct parport *pb)
{
        unsigned char r, w;

        /*
         * first clear an eventually pending EPP timeout
         * I (sailer@ife.ee.ethz.ch) have an SMSC chipset
         * that does not even respond to SPP cycles if an EPP
         * timeout is pending
         */
        clear_epp_timeout(pb);

        /* Do a simple read-write test to make sure the port exists. */
        w = 0xc;
        outb(w, CONTROL(pb));

        /* Is there a control register that we can read from?  Some
         * ports don't allow reads, so read_control just returns a
         * software copy. Some ports _do_ allow reads, so bypass the
         * software copy here.  In addition, some bits aren't
         * writable. */
        r = inb(CONTROL(pb));
        if ((r & 0xf) == w) {
                w = 0xe;
                outb(w, CONTROL(pb));
                r = inb(CONTROL(pb));
                outb(0xc, CONTROL(pb));
                if ((r & 0xf) == w)
                        return PARPORT_MODE_PCSPP;
        }

        if (user_specified)
                /* That didn't work, but the user thinks there's a
                 * port here. */
                printk(KERN_INFO "parport 0x%lx (WARNING): CTR: "
                        "wrote 0x%02x, read 0x%02x\n", pb->base, w, r);

        /* Try the data register.  The data lines aren't tri-stated at
         * this stage, so we expect back what we wrote. */
        w = 0xaa;
        parport_pc_write_data(pb, w);
        r = parport_pc_read_data(pb);
        if (r == w) {
                w = 0x55;
                parport_pc_write_data(pb, w);
                r = parport_pc_read_data(pb);
                if (r == w)
                        return PARPORT_MODE_PCSPP;
        }

        if (user_specified) {
                /* Didn't work, but the user is convinced this is the
                 * place. */
                printk(KERN_INFO "parport 0x%lx (WARNING): DATA: "
                        "wrote 0x%02x, read 0x%02x\n", pb->base, w, r);
                printk(KERN_INFO "parport 0x%lx: You gave this address, "
                        "but there is probably no parallel port there!\n",
                        pb->base);
        }

        /* It's possible that we can't read the control register or
         * the data register.  In that case just believe the user. */
        if (user_specified)
                return PARPORT_MODE_PCSPP;

        return 0;
}

/* Check for ECR
 *
 * Old style XT ports alias io ports every 0x400, hence accessing ECR
 * on these cards actually accesses the CTR.
 *
 * Modern cards don't do this but reading from ECR will return 0xff
 * regardless of what is written here if the card does NOT support
 * ECP.
 *
 * We first check to see if ECR is the same as CTR.  If not, the low
 * two bits of ECR aren't writable, so we check by writing ECR and
 * reading it back to see if it's what we expect.
 */
static int parport_ECR_present(struct parport *pb)
{
        struct parport_pc_private *priv = pb->private_data;
        unsigned char r = 0xc;

        outb(r, CONTROL(pb));
        if ((inb(ECONTROL(pb)) & 0x3) == (r & 0x3)) {
                outb(r ^ 0x2, CONTROL(pb)); /* Toggle bit 1 */

                r = inb(CONTROL(pb));
                if ((inb(ECONTROL(pb)) & 0x2) == (r & 0x2))
                        goto no_reg; /* Sure that no ECR register exists */
        }

        if ((inb(ECONTROL(pb)) & 0x3) != 0x1)
                goto no_reg;

        ECR_WRITE(pb, 0x34);
        if (inb(ECONTROL(pb)) != 0x35)
                goto no_reg;

        priv->ecr = 1;
        outb(0xc, CONTROL(pb));

        /* Go to mode 000 */
        frob_set_mode(pb, ECR_SPP);

        return 1;

 no_reg:
        outb(0xc, CONTROL(pb));
        return 0;
}

#ifdef CONFIG_PARPORT_1284
/* Detect PS/2 support.
 *
 * Bit 5 (0x20) sets the PS/2 data direction; setting this high
 * allows us to read data from the data lines.  In theory we would get back
 * 0xff but any peripheral attached to the port may drag some or all of the
 * lines down to zero.  So if we get back anything that isn't the contents
 * of the data register we deem PS/2 support to be present.
 *
 * Some SPP ports have "half PS/2" ability - you can't turn off the line
 * drivers, but an external peripheral with sufficiently beefy drivers of
 * its own can overpower them and assert its own levels onto the bus, from
 * where they can then be read back as normal.  Ports with this property
 * and the right type of device attached are likely to fail the SPP test,
 * (as they will appear to have stuck bits) and so the fact that they might
 * be misdetected here is rather academic.
 */

static int parport_PS2_supported(struct parport *pb)
{
        int ok = 0;

        clear_epp_timeout(pb);

        /* try to tri-state the buffer */
        parport_pc_data_reverse(pb);

        parport_pc_write_data(pb, 0x55);
        if (parport_pc_read_data(pb) != 0x55)
                ok++;

        parport_pc_write_data(pb, 0xaa);
        if (parport_pc_read_data(pb) != 0xaa)
                ok++;

        /* cancel input mode */
        parport_pc_data_forward(pb);

        if (ok) {
                pb->modes |= PARPORT_MODE_TRISTATE;
        } else {
                struct parport_pc_private *priv = pb->private_data;
                priv->ctr_writable &= ~0x20;
        }

        return ok;
}

#ifdef CONFIG_PARPORT_PC_FIFO
static int parport_ECP_supported(struct parport *pb)
{
        int i;
        int config, configb;
        int pword;
        struct parport_pc_private *priv = pb->private_data;
        /* Translate ECP intrLine to ISA irq value */
        static const int intrline[] = { 0, 7, 9, 10, 11, 14, 15, 5 };

        /* If there is no ECR, we have no hope of supporting ECP. */
        if (!priv->ecr)
                return 0;

        /* Find out FIFO depth */
        ECR_WRITE(pb, ECR_SPP << 5); /* Reset FIFO */
        ECR_WRITE(pb, ECR_TST << 5); /* TEST FIFO */
        for (i = 0; i < 1024 && !(inb(ECONTROL(pb)) & 0x02); i++)
                outb(0xaa, FIFO(pb));

        /*
         * Using LGS chipset it uses ECR register, but
         * it doesn't support ECP or FIFO MODE
         */
        if (i == 1024) {
                ECR_WRITE(pb, ECR_SPP << 5);
                return 0;
        }

        priv->fifo_depth = i;
        if (verbose_probing)
                printk(KERN_DEBUG "0x%lx: FIFO is %d bytes\n", pb->base, i);

        /* Find out writeIntrThreshold */
        frob_econtrol(pb, 1<<2, 1<<2);
        frob_econtrol(pb, 1<<2, 0);
        for (i = 1; i <= priv->fifo_depth; i++) {
                inb(FIFO(pb));
                udelay(50);
                if (inb(ECONTROL(pb)) & (1<<2))
                        break;
        }

        if (i <= priv->fifo_depth) {
                if (verbose_probing)
                        printk(KERN_DEBUG "0x%lx: writeIntrThreshold is %d\n",
                                pb->base, i);
        } else
                /* Number of bytes we know we can write if we get an
                   interrupt. */
                i = 0;

        priv->writeIntrThreshold = i;

        /* Find out readIntrThreshold */
        frob_set_mode(pb, ECR_PS2); /* Reset FIFO and enable PS2 */
        parport_pc_data_reverse(pb); /* Must be in PS2 mode */
        frob_set_mode(pb, ECR_TST); /* Test FIFO */
        frob_econtrol(pb, 1<<2, 1<<2);
        frob_econtrol(pb, 1<<2, 0);
        for (i = 1; i <= priv->fifo_depth; i++) {
                outb(0xaa, FIFO(pb));
                if (inb(ECONTROL(pb)) & (1<<2))
                        break;
        }

        if (i <= priv->fifo_depth) {
                if (verbose_probing)
                        printk(KERN_INFO "0x%lx: readIntrThreshold is %d\n",
                                pb->base, i);
        } else
                /* Number of bytes we can read if we get an interrupt. */
                i = 0;

        priv->readIntrThreshold = i;

        ECR_WRITE(pb, ECR_SPP << 5); /* Reset FIFO */
        ECR_WRITE(pb, 0xf4); /* Configuration mode */
        config = inb(CONFIGA(pb));
        pword = (config >> 4) & 0x7;
        switch (pword) {
        case 0:
                pword = 2;
                printk(KERN_WARNING "0x%lx: Unsupported pword size!\n",
                        pb->base);
                break;
        case 2:
                pword = 4;
                printk(KERN_WARNING "0x%lx: Unsupported pword size!\n",
                        pb->base);
                break;
        default:
                printk(KERN_WARNING "0x%lx: Unknown implementation ID\n",
                        pb->base);
                /* Fall through - Assume 1 */
        case 1:
                pword = 1;
        }
        priv->pword = pword;

        if (verbose_probing) {
                printk(KERN_DEBUG "0x%lx: PWord is %d bits\n",
                        pb->base, 8 * pword);

                printk(KERN_DEBUG "0x%lx: Interrupts are ISA-%s\n", pb->base,
                        config & 0x80 ? "Level" : "Pulses");

                configb = inb(CONFIGB(pb));
                printk(KERN_DEBUG "0x%lx: ECP port cfgA=0x%02x cfgB=0x%02x\n",
                        pb->base, config, configb);
                printk(KERN_DEBUG "0x%lx: ECP settings irq=", pb->base);
                if ((configb >> 3) & 0x07)
                        pr_cont("%d", intrline[(configb >> 3) & 0x07]);
                else
                        pr_cont("<none or set by other means>");
                pr_cont(" dma=");
                if ((configb & 0x03) == 0x00)
                        pr_cont("<none or set by other means>\n");
                else
                        pr_cont("%d\n", configb & 0x07);
        }

        /* Go back to mode 000 */
        frob_set_mode(pb, ECR_SPP);

        return 1;
}
#endif

#ifdef CONFIG_X86_32
static int intel_bug_present_check_epp(struct parport *pb)
{
        const struct parport_pc_private *priv = pb->private_data;
        int bug_present = 0;

        if (priv->ecr) {
                /* store value of ECR */
                unsigned char ecr = inb(ECONTROL(pb));
                unsigned char i;
                for (i = 0x00; i < 0x80; i += 0x20) {
                        ECR_WRITE(pb, i);
                        if (clear_epp_timeout(pb)) {
                                /* Phony EPP in ECP. */
                                bug_present = 1;
                                break;
                        }
                }
                /* return ECR into the inital state */
                ECR_WRITE(pb, ecr);
        }

        return bug_present;
}
static int intel_bug_present(struct parport *pb)
{
/* Check whether the device is legacy, not PCI or PCMCIA. Only legacy is known to be affected. */
        if (pb->dev != NULL) {
                return 0;
        }

        return intel_bug_present_check_epp(pb);
}
#else
static int intel_bug_present(struct parport *pb)
{
        return 0;
}
#endif /* CONFIG_X86_32 */

static int parport_ECPPS2_supported(struct parport *pb)
{
        const struct parport_pc_private *priv = pb->private_data;
        int result;
        unsigned char oecr;

        if (!priv->ecr)
                return 0;

        oecr = inb(ECONTROL(pb));
        ECR_WRITE(pb, ECR_PS2 << 5);
        result = parport_PS2_supported(pb);
        ECR_WRITE(pb, oecr);
        return result;
}

/* EPP mode detection  */

static int parport_EPP_supported(struct parport *pb)
{
        /*
         * Theory:
         *      Bit 0 of STR is the EPP timeout bit, this bit is 0
         *      when EPP is possible and is set high when an EPP timeout
         *      occurs (EPP uses the HALT line to stop the CPU while it does
         *      the byte transfer, an EPP timeout occurs if the attached
         *      device fails to respond after 10 micro seconds).
         *
         *      This bit is cleared by either reading it (National Semi)
         *      or writing a 1 to the bit (SMC, UMC, WinBond), others ???
         *      This bit is always high in non EPP modes.
         */

        /* If EPP timeout bit clear then EPP available */
        if (!clear_epp_timeout(pb))
                return 0;  /* No way to clear timeout */

        /* Check for Intel bug. */
        if (intel_bug_present(pb))
                return 0;

        pb->modes |= PARPORT_MODE_EPP;

        /* Set up access functions to use EPP hardware. */
        pb->ops->epp_read_data = parport_pc_epp_read_data;
        pb->ops->epp_write_data = parport_pc_epp_write_data;
        pb->ops->epp_read_addr = parport_pc_epp_read_addr;
        pb->ops->epp_write_addr = parport_pc_epp_write_addr;

        return 1;
}

static int parport_ECPEPP_supported(struct parport *pb)
{
        struct parport_pc_private *priv = pb->private_data;
        int result;
        unsigned char oecr;

        if (!priv->ecr)
                return 0;

        oecr = inb(ECONTROL(pb));
        /* Search for SMC style EPP+ECP mode */
        ECR_WRITE(pb, 0x80);
        outb(0x04, CONTROL(pb));
        result = parport_EPP_supported(pb);

        ECR_WRITE(pb, oecr);

        if (result) {
                /* Set up access functions to use ECP+EPP hardware. */
                pb->ops->epp_read_data = parport_pc_ecpepp_read_data;
                pb->ops->epp_write_data = parport_pc_ecpepp_write_data;
                pb->ops->epp_read_addr = parport_pc_ecpepp_read_addr;
                pb->ops->epp_write_addr = parport_pc_ecpepp_write_addr;
        }

        return result;
}

#else /* No IEEE 1284 support */

/* Don't bother probing for modes we know we won't use. */
static int parport_PS2_supported(struct parport *pb) { return 0; }
#ifdef CONFIG_PARPORT_PC_FIFO
static int parport_ECP_supported(struct parport *pb)
{
        return 0;
}
#endif
static int parport_EPP_supported(struct parport *pb)
{
        return 0;
}

static int parport_ECPEPP_supported(struct parport *pb)
{
        return 0;
}

static int parport_ECPPS2_supported(struct parport *pb)
{
        return 0;
}

#endif /* No IEEE 1284 support */

/* --- IRQ detection -------------------------------------- */

/* Only if supports ECP mode */
static int programmable_irq_support(struct parport *pb)
{
        int irq, intrLine;
        unsigned char oecr = inb(ECONTROL(pb));
        static const int lookup[8] = {
                PARPORT_IRQ_NONE, 7, 9, 10, 11, 14, 15, 5
        };

        ECR_WRITE(pb, ECR_CNF << 5); /* Configuration MODE */

        intrLine = (inb(CONFIGB(pb)) >> 3) & 0x07;
        irq = lookup[intrLine];

        ECR_WRITE(pb, oecr);
        return irq;
}

static int irq_probe_ECP(struct parport *pb)
{
        int i;
        unsigned long irqs;

        irqs = probe_irq_on();

        ECR_WRITE(pb, ECR_SPP << 5); /* Reset FIFO */
        ECR_WRITE(pb, (ECR_TST << 5) | 0x04);
        ECR_WRITE(pb, ECR_TST << 5);

        /* If Full FIFO sure that writeIntrThreshold is generated */
        for (i = 0; i < 1024 && !(inb(ECONTROL(pb)) & 0x02) ; i++)
                outb(0xaa, FIFO(pb));

        pb->irq = probe_irq_off(irqs);
        ECR_WRITE(pb, ECR_SPP << 5);

        if (pb->irq <= 0)
                pb->irq = PARPORT_IRQ_NONE;

        return pb->irq;
}

/*
 * This detection seems that only works in National Semiconductors
 * This doesn't work in SMC, LGS, and Winbond
 */
static int irq_probe_EPP(struct parport *pb)
{
#ifndef ADVANCED_DETECT
        return PARPORT_IRQ_NONE;
#else
        int irqs;
        unsigned char oecr;

        if (pb->modes & PARPORT_MODE_PCECR)
                oecr = inb(ECONTROL(pb));

        irqs = probe_irq_on();

        if (pb->modes & PARPORT_MODE_PCECR)
                frob_econtrol(pb, 0x10, 0x10);

        clear_epp_timeout(pb);
        parport_pc_frob_control(pb, 0x20, 0x20);
        parport_pc_frob_control(pb, 0x10, 0x10);
        clear_epp_timeout(pb);

        /* Device isn't expecting an EPP read
         * and generates an IRQ.
         */
        parport_pc_read_epp(pb);
        udelay(20);

        pb->irq = probe_irq_off(irqs);
        if (pb->modes & PARPORT_MODE_PCECR)
                ECR_WRITE(pb, oecr);
        parport_pc_write_control(pb, 0xc);

        if (pb->irq <= 0)
                pb->irq = PARPORT_IRQ_NONE;

        return pb->irq;
#endif /* Advanced detection */
}

static int irq_probe_SPP(struct parport *pb)
{
        /* Don't even try to do this. */
        return PARPORT_IRQ_NONE;
}

/* We will attempt to share interrupt requests since other devices
 * such as sound cards and network cards seem to like using the
 * printer IRQs.
 *
 * When ECP is available we can autoprobe for IRQs.
 * NOTE: If we can autoprobe it, we can register the IRQ.
 */
static int parport_irq_probe(struct parport *pb)
{
        struct parport_pc_private *priv = pb->private_data;

        if (priv->ecr) {
                pb->irq = programmable_irq_support(pb);

                if (pb->irq == PARPORT_IRQ_NONE)
                        pb->irq = irq_probe_ECP(pb);
        }

        if ((pb->irq == PARPORT_IRQ_NONE) && priv->ecr &&
            (pb->modes & PARPORT_MODE_EPP))
                pb->irq = irq_probe_EPP(pb);

        clear_epp_timeout(pb);

        if (pb->irq == PARPORT_IRQ_NONE && (pb->modes & PARPORT_MODE_EPP))
                pb->irq = irq_probe_EPP(pb);

        clear_epp_timeout(pb);

        if (pb->irq == PARPORT_IRQ_NONE)
                pb->irq = irq_probe_SPP(pb);

        if (pb->irq == PARPORT_IRQ_NONE)
                pb->irq = get_superio_irq(pb);

        return pb->irq;
}

/* --- DMA detection -------------------------------------- */

/* Only if chipset conforms to ECP ISA Interface Standard */
static int programmable_dma_support(struct parport *p)
{
        unsigned char oecr = inb(ECONTROL(p));
        int dma;

        frob_set_mode(p, ECR_CNF);

        dma = inb(CONFIGB(p)) & 0x07;
        /* 000: Indicates jumpered 8-bit DMA if read-only.
           100: Indicates jumpered 16-bit DMA if read-only. */
        if ((dma & 0x03) == 0)
                dma = PARPORT_DMA_NONE;

        ECR_WRITE(p, oecr);

        return dma;
}

static int parport_dma_probe(struct parport *p)
{
        const struct parport_pc_private *priv = p->private_data;
        if (priv->ecr)          /* ask ECP chipset first */
                p->dma = programmable_dma_support(p);
        if (p->dma == PARPORT_DMA_NONE) {
                /* ask known Super-IO chips proper, although these
                   claim ECP compatible, some don't report their DMA
                   conforming to ECP standards */
                p->dma = get_superio_dma(p);
        }

        return p->dma;
}

/* --- Initialisation code -------------------------------- */

static LIST_HEAD(ports_list);
static DEFINE_SPINLOCK(ports_lock);

struct parport *parport_pc_probe_port(unsigned long int base,
                                      unsigned long int base_hi,
                                      int irq, int dma,
                                      struct device *dev,
                                      int irqflags)
{
        struct parport_pc_private *priv;
        struct parport_operations *ops;
        struct parport *p;
        int probedirq = PARPORT_IRQ_NONE;
        struct resource *base_res;
        struct resource *ECR_res = NULL;
        struct resource *EPP_res = NULL;
        struct platform_device *pdev = NULL;
        int ret;

        if (!dev) {
                /* We need a physical device to attach to, but none was
                 * provided. Create our own. */
                pdev = platform_device_register_simple("parport_pc",
                                                       base, NULL, 0);
                if (IS_ERR(pdev))
                        return NULL;
                dev = &pdev->dev;

                ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(24));
                if (ret) {
                        dev_err(dev, "Unable to set coherent dma mask: disabling DMA\n");
                        dma = PARPORT_DMA_NONE;
                }
        }

        ops = kmalloc(sizeof(struct parport_operations), GFP_KERNEL);
        if (!ops)
                goto out1;

        priv = kmalloc(sizeof(struct parport_pc_private), GFP_KERNEL);
        if (!priv)
                goto out2;

        /* a misnomer, actually - it's allocate and reserve parport number */
        p = parport_register_port(base, irq, dma, ops);
        if (!p)
                goto out3;

        base_res = request_region(base, 3, p->name);
        if (!base_res)
                goto out4;

        memcpy(ops, &parport_pc_ops, sizeof(struct parport_operations));
        priv->ctr = 0xc;
        priv->ctr_writable = ~0x10;
        priv->ecr = 0;
        priv->fifo_depth = 0;
        priv->dma_buf = NULL;
        priv->dma_handle = 0;
        INIT_LIST_HEAD(&priv->list);
        priv->port = p;

        p->dev = dev;
        p->base_hi = base_hi;
        p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
        p->private_data = priv;

        if (base_hi) {
                ECR_res = request_region(base_hi, 3, p->name);
                if (ECR_res)
                        parport_ECR_present(p);
        }

        if (base != 0x3bc) {
                EPP_res = request_region(base+0x3, 5, p->name);
                if (EPP_res)
                        if (!parport_EPP_supported(p))
                                parport_ECPEPP_supported(p);
        }
        if (!parport_SPP_supported(p))
                /* No port. */
                goto out5;
        if (priv->ecr)
                parport_ECPPS2_supported(p);
        else
                parport_PS2_supported(p);

        p->size = (p->modes & PARPORT_MODE_EPP) ? 8 : 3;

        printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base);
        if (p->base_hi && priv->ecr)
                printk(KERN_CONT " (0x%lx)", p->base_hi);
        if (p->irq == PARPORT_IRQ_AUTO) {
                p->irq = PARPORT_IRQ_NONE;
                parport_irq_probe(p);
        } else if (p->irq == PARPORT_IRQ_PROBEONLY) {
                p->irq = PARPORT_IRQ_NONE;
                parport_irq_probe(p);
                probedirq = p->irq;
                p->irq = PARPORT_IRQ_NONE;
        }
        if (p->irq != PARPORT_IRQ_NONE) {
                printk(KERN_CONT ", irq %d", p->irq);
                priv->ctr_writable |= 0x10;

                if (p->dma == PARPORT_DMA_AUTO) {
                        p->dma = PARPORT_DMA_NONE;
                        parport_dma_probe(p);
                }
        }
        if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq
                                           is mandatory (see above) */
                p->dma = PARPORT_DMA_NONE;

#ifdef CONFIG_PARPORT_PC_FIFO
        if (parport_ECP_supported(p) &&
            p->dma != PARPORT_DMA_NOFIFO &&
            priv->fifo_depth > 0 && p->irq != PARPORT_IRQ_NONE) {
                p->modes |= PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
                p->ops->compat_write_data = parport_pc_compat_write_block_pio;
#ifdef CONFIG_PARPORT_1284
                p->ops->ecp_write_data = parport_pc_ecp_write_block_pio;
                /* currently broken, but working on it.. (FB) */
                /* p->ops->ecp_read_data = parport_pc_ecp_read_block_pio; */
#endif /* IEEE 1284 support */
                if (p->dma != PARPORT_DMA_NONE) {
                        printk(KERN_CONT ", dma %d", p->dma);
                        p->modes |= PARPORT_MODE_DMA;
                } else
                        printk(KERN_CONT ", using FIFO");
        } else
                /* We can't use the DMA channel after all. */
                p->dma = PARPORT_DMA_NONE;
#endif /* Allowed to use FIFO/DMA */

        printk(KERN_CONT " [");

#define printmode(x) \
        {\
                if (p->modes & PARPORT_MODE_##x) {\
                        printk(KERN_CONT "%s%s", f ? "," : "", #x);\
                        f++;\
                } \
        }

        {
                int f = 0;
                printmode(PCSPP);
                printmode(TRISTATE);
                printmode(COMPAT)
                printmode(EPP);
                printmode(ECP);
                printmode(DMA);
        }
#undef printmode
#ifndef CONFIG_PARPORT_1284
        printk(KERN_CONT "(,...)");
#endif /* CONFIG_PARPORT_1284 */
        printk(KERN_CONT "]\n");
        if (probedirq != PARPORT_IRQ_NONE)
                printk(KERN_INFO "%s: irq %d detected\n", p->name, probedirq);

        /* If No ECP release the ports grabbed above. */
        if (ECR_res && (p->modes & PARPORT_MODE_ECP) == 0) {
                release_region(base_hi, 3);
                ECR_res = NULL;
        }
        /* Likewise for EEP ports */
        if (EPP_res && (p->modes & PARPORT_MODE_EPP) == 0) {
                release_region(base+3, 5);
                EPP_res = NULL;
        }
        if (p->irq != PARPORT_IRQ_NONE) {
                if (request_irq(p->irq, parport_irq_handler,
                                 irqflags, p->name, p)) {
                        printk(KERN_WARNING "%s: irq %d in use, "
                                "resorting to polled operation\n",
                                p->name, p->irq);
                        p->irq = PARPORT_IRQ_NONE;
                        p->dma = PARPORT_DMA_NONE;
                }

#ifdef CONFIG_PARPORT_PC_FIFO
#ifdef HAS_DMA
                if (p->dma != PARPORT_DMA_NONE) {
                        if (request_dma(p->dma, p->name)) {
                                printk(KERN_WARNING "%s: dma %d in use, "
                                        "resorting to PIO operation\n",
                                        p->name, p->dma);
                                p->dma = PARPORT_DMA_NONE;
                        } else {
                                priv->dma_buf =
                                  dma_alloc_coherent(dev,
                                                       PAGE_SIZE,
                                                       &priv->dma_handle,
                                                       GFP_KERNEL);
                                if (!priv->dma_buf) {
                                        printk(KERN_WARNING "%s: "
                                                "cannot get buffer for DMA, "
                                                "resorting to PIO operation\n",
                                                p->name);
                                        free_dma(p->dma);
                                        p->dma = PARPORT_DMA_NONE;
                                }
                        }
                }
#endif
#endif
        }

        /* Done probing.  Now put the port into a sensible start-up state. */
        if (priv->ecr)
                /*
                 * Put the ECP detected port in PS2 mode.
                 * Do this also for ports that have ECR but don't do ECP.
                 */
                ECR_WRITE(p, 0x34);

        parport_pc_write_data(p, 0);
        parport_pc_data_forward(p);

        /* Now that we've told the sharing engine about the port, and
           found out its characteristics, let the high-level drivers
           know about it. */
        spin_lock(&ports_lock);
        list_add(&priv->list, &ports_list);
        spin_unlock(&ports_lock);
        parport_announce_port(p);

        return p;

out5:
        if (ECR_res)
                release_region(base_hi, 3);
        if (EPP_res)
                release_region(base+0x3, 5);
        release_region(base, 3);
out4:
        parport_del_port(p);
out3:
        kfree(priv);
out2:
        kfree(ops);
out1:
        if (pdev)
                platform_device_unregister(pdev);
        return NULL;
}
EXPORT_SYMBOL(parport_pc_probe_port);

void parport_pc_unregister_port(struct parport *p)
{
        struct parport_pc_private *priv = p->private_data;
        struct parport_operations *ops = p->ops;

        parport_remove_port(p);
        spin_lock(&ports_lock);
        list_del_init(&priv->list);
        spin_unlock(&ports_lock);
#if defined(CONFIG_PARPORT_PC_FIFO) && defined(HAS_DMA)
        if (p->dma != PARPORT_DMA_NONE)
                free_dma(p->dma);
#endif
        if (p->irq != PARPORT_IRQ_NONE)
                free_irq(p->irq, p);
        release_region(p->base, 3);
        if (p->size > 3)
                release_region(p->base + 3, p->size - 3);
        if (p->modes & PARPORT_MODE_ECP)
                release_region(p->base_hi, 3);
#if defined(CONFIG_PARPORT_PC_FIFO) && defined(HAS_DMA)
        if (priv->dma_buf)
                dma_free_coherent(p->physport->dev, PAGE_SIZE,
                                    priv->dma_buf,
                                    priv->dma_handle);
#endif
        kfree(p->private_data);
        parport_del_port(p);
        kfree(ops); /* hope no-one cached it */
}
EXPORT_SYMBOL(parport_pc_unregister_port);

#ifdef CONFIG_PCI

/* ITE support maintained by Rich Liu <richliu@poorman.org> */
static int sio_ite_8872_probe(struct pci_dev *pdev, int autoirq, int autodma,
                              const struct parport_pc_via_data *via)
{
        short inta_addr[6] = { 0x2A0, 0x2C0, 0x220, 0x240, 0x1E0 };
        u32 ite8872set;
        u32 ite8872_lpt, ite8872_lpthi;
        u8 ite8872_irq, type;
        int irq;
        int i;

        DPRINTK(KERN_DEBUG "sio_ite_8872_probe()\n");

        /* make sure which one chip */
        for (i = 0; i < 5; i++) {
                if (request_region(inta_addr[i], 32, "it887x")) {
                        int test;
                        pci_write_config_dword(pdev, 0x60,
                                                0xe5000000 | inta_addr[i]);
                        pci_write_config_dword(pdev, 0x78,
                                                0x00000000 | inta_addr[i]);
                        test = inb(inta_addr[i]);
                        if (test != 0xff)
                                break;
                        release_region(inta_addr[i], 32);
                }
        }
        if (i >= 5) {
                printk(KERN_INFO "parport_pc: cannot find ITE8872 INTA\n");
                return 0;
        }

        type = inb(inta_addr[i] + 0x18);
        type &= 0x0f;

        switch (type) {
        case 0x2:
                printk(KERN_INFO "parport_pc: ITE8871 found (1P)\n");
                ite8872set = 0x64200000;
                break;
        case 0xa:
                printk(KERN_INFO "parport_pc: ITE8875 found (1P)\n");
                ite8872set = 0x64200000;
                break;
        case 0xe:
                printk(KERN_INFO "parport_pc: ITE8872 found (2S1P)\n");
                ite8872set = 0x64e00000;
                break;
        case 0x6:
                printk(KERN_INFO "parport_pc: ITE8873 found (1S)\n");
                release_region(inta_addr[i], 32);
                return 0;
        case 0x8:
                printk(KERN_INFO "parport_pc: ITE8874 found (2S)\n");
                release_region(inta_addr[i], 32);
                return 0;
        default:
                printk(KERN_INFO "parport_pc: unknown ITE887x\n");
                printk(KERN_INFO "parport_pc: please mail 'lspci -nvv' "
                        "output to Rich.Liu@ite.com.tw\n");
                release_region(inta_addr[i], 32);
                return 0;
        }

        pci_read_config_byte(pdev, 0x3c, &ite8872_irq);
        pci_read_config_dword(pdev, 0x1c, &ite8872_lpt);
        ite8872_lpt &= 0x0000ff00;
        pci_read_config_dword(pdev, 0x20, &ite8872_lpthi);
        ite8872_lpthi &= 0x0000ff00;
        pci_write_config_dword(pdev, 0x6c, 0xe3000000 | ite8872_lpt);
        pci_write_config_dword(pdev, 0x70, 0xe3000000 | ite8872_lpthi);
        pci_write_config_dword(pdev, 0x80, (ite8872_lpthi<<16) | ite8872_lpt);
        /* SET SPP&EPP , Parallel Port NO DMA , Enable All Function */
        /* SET Parallel IRQ */
        pci_write_config_dword(pdev, 0x9c,
                                ite8872set | (ite8872_irq * 0x11111));

        DPRINTK(KERN_DEBUG "ITE887x: The IRQ is %d.\n", ite8872_irq);
        DPRINTK(KERN_DEBUG "ITE887x: The PARALLEL I/O port is 0x%x.\n",
                 ite8872_lpt);
        DPRINTK(KERN_DEBUG "ITE887x: The PARALLEL I/O porthi is 0x%x.\n",
                 ite8872_lpthi);

        /* Let the user (or defaults) steer us away from interrupts */
        irq = ite8872_irq;
        if (autoirq != PARPORT_IRQ_AUTO)
                irq = PARPORT_IRQ_NONE;

        /*
         * Release the resource so that parport_pc_probe_port can get it.
         */
        release_region(inta_addr[i], 32);
        if (parport_pc_probe_port(ite8872_lpt, ite8872_lpthi,
                                   irq, PARPORT_DMA_NONE, &pdev->dev, 0)) {
                printk(KERN_INFO
                        "parport_pc: ITE 8872 parallel port: io=0x%X",
                                                                ite8872_lpt);
                if (irq != PARPORT_IRQ_NONE)
                        pr_cont(", irq=%d", irq);
                pr_cont("\n");
                return 1;
        }

        return 0;
}

/* VIA 8231 support by Pavel Fedin <sonic_amiga@rambler.ru>
   based on VIA 686a support code by Jeff Garzik <jgarzik@pobox.com> */
static int parport_init_mode;

/* Data for two known VIA chips */
static struct parport_pc_via_data via_686a_data = {
        0x51,
        0x50,
        0x85,
        0x02,
        0xE2,
        0xF0,
        0xE6
};
static struct parport_pc_via_data via_8231_data = {
        0x45,
        0x44,
        0x50,
        0x04,
        0xF2,
        0xFA,
        0xF6
};

static int sio_via_probe(struct pci_dev *pdev, int autoirq, int autodma,
                         const struct parport_pc_via_data *via)
{
        u8 tmp, tmp2, siofunc;
        u8 ppcontrol = 0;
        int dma, irq;
        unsigned port1, port2;
        unsigned have_epp = 0;

        printk(KERN_DEBUG "parport_pc: VIA 686A/8231 detected\n");

        switch (parport_init_mode) {
        case 1:
                printk(KERN_DEBUG "parport_pc: setting SPP mode\n");
                siofunc = VIA_FUNCTION_PARPORT_SPP;
                break;
        case 2:
                printk(KERN_DEBUG "parport_pc: setting PS/2 mode\n");
                siofunc = VIA_FUNCTION_PARPORT_SPP;
                ppcontrol = VIA_PARPORT_BIDIR;
                break;
        case 3:
                printk(KERN_DEBUG "parport_pc: setting EPP mode\n");
                siofunc = VIA_FUNCTION_PARPORT_EPP;
                ppcontrol = VIA_PARPORT_BIDIR;
                have_epp = 1;
                break;
        case 4:
                printk(KERN_DEBUG "parport_pc: setting ECP mode\n");
                siofunc = VIA_FUNCTION_PARPORT_ECP;
                ppcontrol = VIA_PARPORT_BIDIR;
                break;
        case 5:
                printk(KERN_DEBUG "parport_pc: setting EPP+ECP mode\n");
                siofunc = VIA_FUNCTION_PARPORT_ECP;
                ppcontrol = VIA_PARPORT_BIDIR|VIA_PARPORT_ECPEPP;
                have_epp = 1;
                break;
        default:
                printk(KERN_DEBUG
                        "parport_pc: probing current configuration\n");
                siofunc = VIA_FUNCTION_PROBE;
                break;
        }
        /*
         * unlock super i/o configuration
         */
        pci_read_config_byte(pdev, via->via_pci_superio_config_reg, &tmp);
        tmp |= via->via_pci_superio_config_data;
        pci_write_config_byte(pdev, via->via_pci_superio_config_reg, tmp);

        /* Bits 1-0: Parallel Port Mode / Enable */
        outb(via->viacfg_function, VIA_CONFIG_INDEX);
        tmp = inb(VIA_CONFIG_DATA);
        /* Bit 5: EPP+ECP enable; bit 7: PS/2 bidirectional port enable */
        outb(via->viacfg_parport_control, VIA_CONFIG_INDEX);
        tmp2 = inb(VIA_CONFIG_DATA);
        if (siofunc == VIA_FUNCTION_PROBE) {
                siofunc = tmp & VIA_FUNCTION_PARPORT_DISABLE;
                ppcontrol = tmp2;
        } else {
                tmp &= ~VIA_FUNCTION_PARPORT_DISABLE;
                tmp |= siofunc;
                outb(via->viacfg_function, VIA_CONFIG_INDEX);
                outb(tmp, VIA_CONFIG_DATA);
                tmp2 &= ~(VIA_PARPORT_BIDIR|VIA_PARPORT_ECPEPP);
                tmp2 |= ppcontrol;
                outb(via->viacfg_parport_control, VIA_CONFIG_INDEX);
                outb(tmp2, VIA_CONFIG_DATA);
        }

        /* Parallel Port I/O Base Address, bits 9-2 */
        outb(via->viacfg_parport_base, VIA_CONFIG_INDEX);
        port1 = inb(VIA_CONFIG_DATA) << 2;

        printk(KERN_DEBUG "parport_pc: Current parallel port base: 0x%X\n",
                                                                        port1);
        if (port1 == 0x3BC && have_epp) {
                outb(via->viacfg_parport_base, VIA_CONFIG_INDEX);
                outb((0x378 >> 2), VIA_CONFIG_DATA);
                printk(KERN_DEBUG
                        "parport_pc: Parallel port base changed to 0x378\n");
                port1 = 0x378;
        }

        /*
         * lock super i/o configuration
         */
        pci_read_config_byte(pdev, via->via_pci_superio_config_reg, &tmp);
        tmp &= ~via->via_pci_superio_config_data;
        pci_write_config_byte(pdev, via->via_pci_superio_config_reg, tmp);

        if (siofunc == VIA_FUNCTION_PARPORT_DISABLE) {
                printk(KERN_INFO "parport_pc: VIA parallel port disabled in BIOS\n");
                return 0;
        }

        /* Bits 7-4: PnP Routing for Parallel Port IRQ */
        pci_read_config_byte(pdev, via->via_pci_parport_irq_reg, &tmp);
        irq = ((tmp & VIA_IRQCONTROL_PARALLEL) >> 4);

        if (siofunc == VIA_FUNCTION_PARPORT_ECP) {
                /* Bits 3-2: PnP Routing for Parallel Port DMA */
                pci_read_config_byte(pdev, via->via_pci_parport_dma_reg, &tmp);
                dma = ((tmp & VIA_DMACONTROL_PARALLEL) >> 2);
        } else
                /* if ECP not enabled, DMA is not enabled, assumed
                   bogus 'dma' value */
                dma = PARPORT_DMA_NONE;

        /* Let the user (or defaults) steer us away from interrupts and DMA */
        if (autoirq == PARPORT_IRQ_NONE) {
                irq = PARPORT_IRQ_NONE;
                dma = PARPORT_DMA_NONE;
        }
        if (autodma == PARPORT_DMA_NONE)
                dma = PARPORT_DMA_NONE;

        switch (port1) {
        case 0x3bc:
                port2 = 0x7bc; break;
        case 0x378:
                port2 = 0x778; break;
        case 0x278:
                port2 = 0x678; break;
        default:
                printk(KERN_INFO
                        "parport_pc: Weird VIA parport base 0x%X, ignoring\n",
                                                                        port1);
                return 0;
        }

        /* filter bogus IRQs */
        switch (irq) {
        case 0:
        case 2:
        case 8:
        case 13:
                irq = PARPORT_IRQ_NONE;
                break;

        default: /* do nothing */
                break;
        }

        /* finally, do the probe with values obtained */
        if (parport_pc_probe_port(port1, port2, irq, dma, &pdev->dev, 0)) {
                printk(KERN_INFO
                        "parport_pc: VIA parallel port: io=0x%X", port1);
                if (irq != PARPORT_IRQ_NONE)
                        pr_cont(", irq=%d", irq);
                if (dma != PARPORT_DMA_NONE)
                        pr_cont(", dma=%d", dma);
                pr_cont("\n");
                return 1;
        }

        printk(KERN_WARNING "parport_pc: Strange, can't probe VIA parallel port: io=0x%X, irq=%d, dma=%d\n",
                port1, irq, dma);
        return 0;
}


enum parport_pc_sio_types {
        sio_via_686a = 0,   /* Via VT82C686A motherboard Super I/O */
        sio_via_8231,       /* Via VT8231 south bridge integrated Super IO */
        sio_ite_8872,
        last_sio
};

/* each element directly indexed from enum list, above */
static struct parport_pc_superio {
        int (*probe) (struct pci_dev *pdev, int autoirq, int autodma,
                      const struct parport_pc_via_data *via);
        const struct parport_pc_via_data *via;
} parport_pc_superio_info[] = {
        { sio_via_probe, &via_686a_data, },
        { sio_via_probe, &via_8231_data, },
        { sio_ite_8872_probe, NULL, },
};

enum parport_pc_pci_cards {
        siig_1p_10x = last_sio,
        siig_2p_10x,
        siig_1p_20x,
        siig_2p_20x,
        lava_parallel,
        lava_parallel_dual_a,
        lava_parallel_dual_b,
        boca_ioppar,
        plx_9050,
        timedia_4006a,
        timedia_4014,
        timedia_4008a,
        timedia_4018,
        timedia_9018a,
        syba_2p_epp,
        syba_1p_ecp,
        titan_010l,
        avlab_1p,
        avlab_2p,
        oxsemi_952,
        oxsemi_954,
        oxsemi_840,
        oxsemi_pcie_pport,
        aks_0100,
        mobility_pp,
        netmos_9705,
        netmos_9715,
        netmos_9755,
        netmos_9805,
        netmos_9815,
        netmos_9901,
        netmos_9865,
        quatech_sppxp100,
        wch_ch382l,
};


/* each element directly indexed from enum list, above
 * (but offset by last_sio) */
static struct parport_pc_pci {
        int numports;
        struct { /* BAR (base address registers) numbers in the config
                    space header */
                int lo;
                int hi;
                /* -1 if not there, >6 for offset-method (max BAR is 6) */
        } addr[4];

        /* If set, this is called immediately after pci_enable_device.
         * If it returns non-zero, no probing will take place and the
         * ports will not be used. */
        int (*preinit_hook) (struct pci_dev *pdev, int autoirq, int autodma);

        /* If set, this is called after probing for ports.  If 'failed'
         * is non-zero we couldn't use any of the ports. */
        void (*postinit_hook) (struct pci_dev *pdev, int failed);
} cards[] = {
        /* siig_1p_10x */               { 1, { { 2, 3 }, } },
        /* siig_2p_10x */               { 2, { { 2, 3 }, { 4, 5 }, } },
        /* siig_1p_20x */               { 1, { { 0, 1 }, } },
        /* siig_2p_20x */               { 2, { { 0, 1 }, { 2, 3 }, } },
        /* lava_parallel */             { 1, { { 0, -1 }, } },
        /* lava_parallel_dual_a */      { 1, { { 0, -1 }, } },
        /* lava_parallel_dual_b */      { 1, { { 0, -1 }, } },
        /* boca_ioppar */               { 1, { { 0, -1 }, } },
        /* plx_9050 */                  { 2, { { 4, -1 }, { 5, -1 }, } },
        /* timedia_4006a */             { 1, { { 0, -1 }, } },
        /* timedia_4014  */             { 2, { { 0, -1 }, { 2, -1 }, } },
        /* timedia_4008a */             { 1, { { 0, 1 }, } },
        /* timedia_4018  */             { 2, { { 0, 1 }, { 2, 3 }, } },
        /* timedia_9018a */             { 2, { { 0, 1 }, { 2, 3 }, } },
                                        /* SYBA uses fixed offsets in
                                           a 1K io window */
        /* syba_2p_epp AP138B */        { 2, { { 0, 0x078 }, { 0, 0x178 }, } },
        /* syba_1p_ecp W83787 */        { 1, { { 0, 0x078 }, } },
        /* titan_010l */                { 1, { { 3, -1 }, } },
        /* avlab_1p             */      { 1, { { 0, 1}, } },
        /* avlab_2p             */      { 2, { { 0, 1}, { 2, 3 },} },
        /* The Oxford Semi cards are unusual: 954 doesn't support ECP,
         * and 840 locks up if you write 1 to bit 2! */
        /* oxsemi_952 */                { 1, { { 0, 1 }, } },
        /* oxsemi_954 */                { 1, { { 0, -1 }, } },
        /* oxsemi_840 */                { 1, { { 0, 1 }, } },
        /* oxsemi_pcie_pport */         { 1, { { 0, 1 }, } },
        /* aks_0100 */                  { 1, { { 0, -1 }, } },
        /* mobility_pp */               { 1, { { 0, 1 }, } },

        /* The netmos entries below are untested */
        /* netmos_9705 */               { 1, { { 0, -1 }, } },
        /* netmos_9715 */               { 2, { { 0, 1 }, { 2, 3 },} },
        /* netmos_9755 */               { 2, { { 0, 1 }, { 2, 3 },} },
        /* netmos_9805 */               { 1, { { 0, 1 }, } },
        /* netmos_9815 */               { 2, { { 0, 1 }, { 2, 3 }, } },
        /* netmos_9901 */               { 1, { { 0, -1 }, } },
        /* netmos_9865 */               { 1, { { 0, -1 }, } },
        /* quatech_sppxp100 */          { 1, { { 0, 1 }, } },
        /* wch_ch382l */                { 1, { { 2, -1 }, } },
};

static const struct pci_device_id parport_pc_pci_tbl[] = {
        /* Super-IO onboard chips */
        { 0x1106, 0x0686, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sio_via_686a },
        { 0x1106, 0x8231, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sio_via_8231 },
        { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8872,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, sio_ite_8872 },

        /* PCI cards */
        { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1P_10x,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_1p_10x },
        { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2P_10x,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2p_10x },
        { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1P_20x,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_1p_20x },
        { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2P_20x,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2p_20x },
        { PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_PARALLEL,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, lava_parallel },
        { PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_DUAL_PAR_A,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, lava_parallel_dual_a },
        { PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_DUAL_PAR_B,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, lava_parallel_dual_b },
        { PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_BOCA_IOPPAR,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, boca_ioppar },
        { PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
          PCI_SUBVENDOR_ID_EXSYS, PCI_SUBDEVICE_ID_EXSYS_4014, 0, 0, plx_9050 },
        /* PCI_VENDOR_ID_TIMEDIA/SUNIX has many differing cards ...*/
        { 0x1409, 0x7268, 0x1409, 0x0101, 0, 0, timedia_4006a },
        { 0x1409, 0x7268, 0x1409, 0x0102, 0, 0, timedia_4014 },
        { 0x1409, 0x7268, 0x1409, 0x0103, 0, 0, timedia_4008a },
        { 0x1409, 0x7268, 0x1409, 0x0104, 0, 0, timedia_4018 },
        { 0x1409, 0x7268, 0x1409, 0x9018, 0, 0, timedia_9018a },
        { PCI_VENDOR_ID_SYBA, PCI_DEVICE_ID_SYBA_2P_EPP,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, syba_2p_epp },
        { PCI_VENDOR_ID_SYBA, PCI_DEVICE_ID_SYBA_1P_ECP,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, syba_1p_ecp },
        { PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_010L,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, titan_010l },
        /* PCI_VENDOR_ID_AVLAB/Intek21 has another bunch of cards ...*/
        /* AFAVLAB_TK9902 */
        { 0x14db, 0x2120, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_1p},
        { 0x14db, 0x2121, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_2p},
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI952PP,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_952 },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI954PP,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_954 },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_12PCI840,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_840 },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe840,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe840_G,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe952_0,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe952_0_G,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe952_1,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe952_1_G,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe952_1_U,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_PCIe952_1_GU,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, oxsemi_pcie_pport },
        { PCI_VENDOR_ID_AKS, PCI_DEVICE_ID_AKS_ALADDINCARD,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, aks_0100 },
        { 0x14f2, 0x0121, PCI_ANY_ID, PCI_ANY_ID, 0, 0, mobility_pp },
        /* NetMos communication controllers */
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9705,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9705 },
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9715,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9715 },
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9755,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9755 },
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9805,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9805 },
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9815,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9815 },
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9901,
          0xA000, 0x2000, 0, 0, netmos_9901 },
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9865,
          0xA000, 0x1000, 0, 0, netmos_9865 },
        { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9865,
          0xA000, 0x2000, 0, 0, netmos_9865 },
        /* Quatech SPPXP-100 Parallel port PCI ExpressCard */
        { PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_SPPXP_100,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, quatech_sppxp100 },
        /* WCH CH382L PCI-E single parallel port card */
        { 0x1c00, 0x3050, 0x1c00, 0x3050, 0, 0, wch_ch382l },
        { 0, } /* terminate list */
};
MODULE_DEVICE_TABLE(pci, parport_pc_pci_tbl);

struct pci_parport_data {
        int num;
        struct parport *ports[2];
};

static int parport_pc_pci_probe(struct pci_dev *dev,
                                           const struct pci_device_id *id)
{
        int err, count, n, i = id->driver_data;
        struct pci_parport_data *data;

        if (i < last_sio)
                /* This is an onboard Super-IO and has already been probed */
                return 0;

        /* This is a PCI card */
        i -= last_sio;
        count = 0;
        err = pci_enable_device(dev);
        if (err)
                return err;

        data = kmalloc(sizeof(struct pci_parport_data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        if (cards[i].preinit_hook &&
            cards[i].preinit_hook(dev, PARPORT_IRQ_NONE, PARPORT_DMA_NONE)) {
                kfree(data);
                return -ENODEV;
        }

        for (n = 0; n < cards[i].numports; n++) {
                int lo = cards[i].addr[n].lo;
                int hi = cards[i].addr[n].hi;
                int irq;
                unsigned long io_lo, io_hi;
                io_lo = pci_resource_start(dev, lo);
                io_hi = 0;
                if ((hi >= 0) && (hi <= 6))
                        io_hi = pci_resource_start(dev, hi);
                else if (hi > 6)
                        io_lo += hi; /* Reinterpret the meaning of
                                        "hi" as an offset (see SYBA
                                        def.) */
                /* TODO: test if sharing interrupts works */
                irq = dev->irq;
                if (irq == IRQ_NONE) {
                        printk(KERN_DEBUG
        "PCI parallel port detected: %04x:%04x, I/O at %#lx(%#lx)\n",
                                id->vendor, id->device, io_lo, io_hi);
                        irq = PARPORT_IRQ_NONE;
                } else {
                        printk(KERN_DEBUG
        "PCI parallel port detected: %04x:%04x, I/O at %#lx(%#lx), IRQ %d\n",
                                id->vendor, id->device, io_lo, io_hi, irq);
                }
                data->ports[count] =
                        parport_pc_probe_port(io_lo, io_hi, irq,
                                               PARPORT_DMA_NONE, &dev->dev,
                                               IRQF_SHARED);
                if (data->ports[count])
                        count++;
        }

        data->num = count;

        if (cards[i].postinit_hook)
                cards[i].postinit_hook(dev, count == 0);

        if (count) {
                pci_set_drvdata(dev, data);
                return 0;
        }

        kfree(data);

        return -ENODEV;
}

static void parport_pc_pci_remove(struct pci_dev *dev)
{
        struct pci_parport_data *data = pci_get_drvdata(dev);
        int i;

        if (data) {
                for (i = data->num - 1; i >= 0; i--)
                        parport_pc_unregister_port(data->ports[i]);

                kfree(data);
        }
}

static struct pci_driver parport_pc_pci_driver = {
        .name           = "parport_pc",
        .id_table       = parport_pc_pci_tbl,
        .probe          = parport_pc_pci_probe,
        .remove         = parport_pc_pci_remove,
};

static int __init parport_pc_init_superio(int autoirq, int autodma)
{
        const struct pci_device_id *id;
        struct pci_dev *pdev = NULL;
        int ret = 0;

        for_each_pci_dev(pdev) {
                id = pci_match_id(parport_pc_pci_tbl, pdev);
                if (id == NULL || id->driver_data >= last_sio)
                        continue;

                if (parport_pc_superio_info[id->driver_data].probe(
                        pdev, autoirq, autodma,
                        parport_pc_superio_info[id->driver_data].via)) {
                        ret++;
                }
        }

        return ret; /* number of devices found */
}
#else
static struct pci_driver parport_pc_pci_driver;
static int __init parport_pc_init_superio(int autoirq, int autodma)
{
        return 0;
}
#endif /* CONFIG_PCI */

#ifdef CONFIG_PNP

static const struct pnp_device_id parport_pc_pnp_tbl[] = {
        /* Standard LPT Printer Port */
        {.id = "PNP0400", .driver_data = 0},
        /* ECP Printer Port */
        {.id = "PNP0401", .driver_data = 0},
        { }
};

MODULE_DEVICE_TABLE(pnp, parport_pc_pnp_tbl);

static int parport_pc_pnp_probe(struct pnp_dev *dev,
                                                const struct pnp_device_id *id)
{
        struct parport *pdata;
        unsigned long io_lo, io_hi;
        int dma, irq;

        if (pnp_port_valid(dev, 0) &&
                !(pnp_port_flags(dev, 0) & IORESOURCE_DISABLED)) {
                io_lo = pnp_port_start(dev, 0);
        } else
                return -EINVAL;

        if (pnp_port_valid(dev, 1) &&
                !(pnp_port_flags(dev, 1) & IORESOURCE_DISABLED)) {
                io_hi = pnp_port_start(dev, 1);
        } else
                io_hi = 0;

        if (pnp_irq_valid(dev, 0) &&
                !(pnp_irq_flags(dev, 0) & IORESOURCE_DISABLED)) {
                irq = pnp_irq(dev, 0);
        } else
                irq = PARPORT_IRQ_NONE;

        if (pnp_dma_valid(dev, 0) &&
                !(pnp_dma_flags(dev, 0) & IORESOURCE_DISABLED)) {
                dma = pnp_dma(dev, 0);
        } else
                dma = PARPORT_DMA_NONE;

        dev_info(&dev->dev, "reported by %s\n", dev->protocol->name);
        pdata = parport_pc_probe_port(io_lo, io_hi, irq, dma, &dev->dev, 0);
        if (pdata == NULL)
                return -ENODEV;

        pnp_set_drvdata(dev, pdata);
        return 0;
}

static void parport_pc_pnp_remove(struct pnp_dev *dev)
{
        struct parport *pdata = (struct parport *)pnp_get_drvdata(dev);
        if (!pdata)
                return;

        parport_pc_unregister_port(pdata);
}

/* we only need the pnp layer to activate the device, at least for now */
static struct pnp_driver parport_pc_pnp_driver = {
        .name           = "parport_pc",

        .id_table       = parport_pc_pnp_tbl,
        .probe          = parport_pc_pnp_probe,
        .remove         = parport_pc_pnp_remove,
};

#else
static struct pnp_driver parport_pc_pnp_driver;
#endif /* CONFIG_PNP */

static int parport_pc_platform_probe(struct platform_device *pdev)
{
        /* Always succeed, the actual probing is done in
         * parport_pc_probe_port(). */
        return 0;
}

static struct platform_driver parport_pc_platform_driver = {
        .driver = {
                .name   = "parport_pc",
        },
        .probe          = parport_pc_platform_probe,
};

/* This is called by parport_pc_find_nonpci_ports (in asm/parport.h) */
static int __attribute__((unused))
parport_pc_find_isa_ports(int autoirq, int autodma)
{
        int count = 0;

        if (parport_pc_probe_port(0x3bc, 0x7bc, autoirq, autodma, NULL, 0))
                count++;
        if (parport_pc_probe_port(0x378, 0x778, autoirq, autodma, NULL, 0))
                count++;
        if (parport_pc_probe_port(0x278, 0x678, autoirq, autodma, NULL, 0))
                count++;

        return count;
}

/* This function is called by parport_pc_init if the user didn't
 * specify any ports to probe.  Its job is to find some ports.  Order
 * is important here -- we want ISA ports to be registered first,
 * followed by PCI cards (for least surprise), but before that we want
 * to do chipset-specific tests for some onboard ports that we know
 * about.
 *
 * autoirq is PARPORT_IRQ_NONE, PARPORT_IRQ_AUTO, or PARPORT_IRQ_PROBEONLY
 * autodma is PARPORT_DMA_NONE or PARPORT_DMA_AUTO
 */
static void __init parport_pc_find_ports(int autoirq, int autodma)
{
        int count = 0, err;

#ifdef CONFIG_PARPORT_PC_SUPERIO
        detect_and_report_it87();
        detect_and_report_winbond();
        detect_and_report_smsc();
#endif

        /* Onboard SuperIO chipsets that show themselves on the PCI bus. */
        count += parport_pc_init_superio(autoirq, autodma);

        /* PnP ports, skip detection if SuperIO already found them */
        if (!count) {
                err = pnp_register_driver(&parport_pc_pnp_driver);
                if (!err)
                        pnp_registered_parport = 1;
        }

        /* ISA ports and whatever (see asm/parport.h). */
        parport_pc_find_nonpci_ports(autoirq, autodma);

        err = pci_register_driver(&parport_pc_pci_driver);
        if (!err)
                pci_registered_parport = 1;
}

/*
 *      Piles of crap below pretend to be a parser for module and kernel
 *      parameters.  Say "thank you" to whoever had come up with that
 *      syntax and keep in mind that code below is a cleaned up version.
 */

static int __initdata io[PARPORT_PC_MAX_PORTS+1] = {
        [0 ... PARPORT_PC_MAX_PORTS] = 0
};
static int __initdata io_hi[PARPORT_PC_MAX_PORTS+1] = {
        [0 ... PARPORT_PC_MAX_PORTS] = PARPORT_IOHI_AUTO
};
static int __initdata dmaval[PARPORT_PC_MAX_PORTS] = {
        [0 ... PARPORT_PC_MAX_PORTS-1] = PARPORT_DMA_NONE
};
static int __initdata irqval[PARPORT_PC_MAX_PORTS] = {
        [0 ... PARPORT_PC_MAX_PORTS-1] = PARPORT_IRQ_PROBEONLY
};

static int __init parport_parse_param(const char *s, int *val,
                                int automatic, int none, int nofifo)
{
        if (!s)
                return 0;
        if (!strncmp(s, "auto", 4))
                *val = automatic;
        else if (!strncmp(s, "none", 4))
                *val = none;
        else if (nofifo && !strncmp(s, "nofifo", 6))
                *val = nofifo;
        else {
                char *ep;
                unsigned long r = simple_strtoul(s, &ep, 0);
                if (ep != s)
                        *val = r;
                else {
                        printk(KERN_ERR "parport: bad specifier `%s'\n", s);
                        return -1;
                }
        }
        return 0;
}

static int __init parport_parse_irq(const char *irqstr, int *val)
{
        return parport_parse_param(irqstr, val, PARPORT_IRQ_AUTO,
                                     PARPORT_IRQ_NONE, 0);
}

static int __init parport_parse_dma(const char *dmastr, int *val)
{
        return parport_parse_param(dmastr, val, PARPORT_DMA_AUTO,
                                     PARPORT_DMA_NONE, PARPORT_DMA_NOFIFO);
}

#ifdef CONFIG_PCI
static int __init parport_init_mode_setup(char *str)
{
        printk(KERN_DEBUG
             "parport_pc.c: Specified parameter parport_init_mode=%s\n", str);

        if (!strcmp(str, "spp"))
                parport_init_mode = 1;
        if (!strcmp(str, "ps2"))
                parport_init_mode = 2;
        if (!strcmp(str, "epp"))
                parport_init_mode = 3;
        if (!strcmp(str, "ecp"))
                parport_init_mode = 4;
        if (!strcmp(str, "ecpepp"))
                parport_init_mode = 5;
        return 1;
}
#endif

#ifdef MODULE
static char *irq[PARPORT_PC_MAX_PORTS];
static char *dma[PARPORT_PC_MAX_PORTS];

MODULE_PARM_DESC(io, "Base I/O address (SPP regs)");
module_param_hw_array(io, int, ioport, NULL, 0);
MODULE_PARM_DESC(io_hi, "Base I/O address (ECR)");
module_param_hw_array(io_hi, int, ioport, NULL, 0);
MODULE_PARM_DESC(irq, "IRQ line");
module_param_hw_array(irq, charp, irq, NULL, 0);
MODULE_PARM_DESC(dma, "DMA channel");
module_param_hw_array(dma, charp, dma, NULL, 0);
#if defined(CONFIG_PARPORT_PC_SUPERIO) || \
       (defined(CONFIG_PARPORT_1284) && defined(CONFIG_PARPORT_PC_FIFO))
MODULE_PARM_DESC(verbose_probing, "Log chit-chat during initialisation");
module_param(verbose_probing, int, 0644);
#endif
#ifdef CONFIG_PCI
static char *init_mode;
MODULE_PARM_DESC(init_mode,
        "Initialise mode for VIA VT8231 port (spp, ps2, epp, ecp or ecpepp)");
module_param(init_mode, charp, 0);
#endif

static int __init parse_parport_params(void)
{
        unsigned int i;
        int val;

#ifdef CONFIG_PCI
        if (init_mode)
                parport_init_mode_setup(init_mode);
#endif

        for (i = 0; i < PARPORT_PC_MAX_PORTS && io[i]; i++) {
                if (parport_parse_irq(irq[i], &val))
                        return 1;
                irqval[i] = val;
                if (parport_parse_dma(dma[i], &val))
                        return 1;
                dmaval[i] = val;
        }
        if (!io[0]) {
                /* The user can make us use any IRQs or DMAs we find. */
                if (irq[0] && !parport_parse_irq(irq[0], &val))
                        switch (val) {
                        case PARPORT_IRQ_NONE:
                        case PARPORT_IRQ_AUTO:
                                irqval[0] = val;
                                break;
                        default:
                                printk(KERN_WARNING
                                        "parport_pc: irq specified "
                                        "without base address.  Use 'io=' "
                                        "to specify one\n");
                        }

                if (dma[0] && !parport_parse_dma(dma[0], &val))
                        switch (val) {
                        case PARPORT_DMA_NONE:
                        case PARPORT_DMA_AUTO:
                                dmaval[0] = val;
                                break;
                        default:
                                printk(KERN_WARNING
                                        "parport_pc: dma specified "
                                        "without base address.  Use 'io=' "
                                        "to specify one\n");
                        }
        }
        return 0;
}

#else

static int parport_setup_ptr __initdata;

/*
 * Acceptable parameters:
 *
 * parport=0
 * parport=auto
 * parport=0xBASE[,IRQ[,DMA]]
 *
 * IRQ/DMA may be numeric or 'auto' or 'none'
 */
static int __init parport_setup(char *str)
{
        char *endptr;
        char *sep;
        int val;

        if (!str || !*str || (*str == '0' && !*(str+1))) {
                /* Disable parport if "parport=0" in cmdline */
                io[0] = PARPORT_DISABLE;
                return 1;
        }

        if (!strncmp(str, "auto", 4)) {
                irqval[0] = PARPORT_IRQ_AUTO;
                dmaval[0] = PARPORT_DMA_AUTO;
                return 1;
        }

        val = simple_strtoul(str, &endptr, 0);
        if (endptr == str) {
                printk(KERN_WARNING "parport=%s not understood\n", str);
                return 1;
        }

        if (parport_setup_ptr == PARPORT_PC_MAX_PORTS) {
                printk(KERN_ERR "parport=%s ignored, too many ports\n", str);
                return 1;
        }

        io[parport_setup_ptr] = val;
        irqval[parport_setup_ptr] = PARPORT_IRQ_NONE;
        dmaval[parport_setup_ptr] = PARPORT_DMA_NONE;

        sep = strchr(str, ',');
        if (sep++) {
                if (parport_parse_irq(sep, &val))
                        return 1;
                irqval[parport_setup_ptr] = val;
                sep = strchr(sep, ',');
                if (sep++) {
                        if (parport_parse_dma(sep, &val))
                                return 1;
                        dmaval[parport_setup_ptr] = val;
                }
        }
        parport_setup_ptr++;
        return 1;
}

static int __init parse_parport_params(void)
{
        return io[0] == PARPORT_DISABLE;
}

__setup("parport=", parport_setup);

/*
 * Acceptable parameters:
 *
 * parport_init_mode=[spp|ps2|epp|ecp|ecpepp]
 */
#ifdef CONFIG_PCI
__setup("parport_init_mode=", parport_init_mode_setup);
#endif
#endif

/* "Parser" ends here */

static int __init parport_pc_init(void)
{
        int err;

        if (parse_parport_params())
                return -EINVAL;

        err = platform_driver_register(&parport_pc_platform_driver);
        if (err)
                return err;

        if (io[0]) {
                int i;
                /* Only probe the ports we were given. */
                user_specified = 1;
                for (i = 0; i < PARPORT_PC_MAX_PORTS; i++) {
                        if (!io[i])
                                break;
                        if (io_hi[i] == PARPORT_IOHI_AUTO)
                                io_hi[i] = 0x400 + io[i];
                        parport_pc_probe_port(io[i], io_hi[i],
                                        irqval[i], dmaval[i], NULL, 0);
                }
        } else
                parport_pc_find_ports(irqval[0], dmaval[0]);

        return 0;
}

static void __exit parport_pc_exit(void)
{
        if (pci_registered_parport)
                pci_unregister_driver(&parport_pc_pci_driver);
        if (pnp_registered_parport)
                pnp_unregister_driver(&parport_pc_pnp_driver);
        platform_driver_unregister(&parport_pc_platform_driver);

        while (!list_empty(&ports_list)) {
                struct parport_pc_private *priv;
                struct parport *port;
                struct device *dev;
                priv = list_entry(ports_list.next,
                                  struct parport_pc_private, list);
                port = priv->port;
                dev = port->dev;
                parport_pc_unregister_port(port);
                if (dev && dev->bus == &platform_bus_type)
                        platform_device_unregister(to_platform_device(dev));
        }
}

MODULE_AUTHOR("Phil Blundell, Tim Waugh, others");
MODULE_DESCRIPTION("PC-style parallel port driver");
MODULE_LICENSE("GPL");
module_init(parport_pc_init)
module_exit(parport_pc_exit)