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/*

 *      Low-level parallel-support for PC-style hardware integrated in the

 *      LASI-Controller (on GSC-Bus) for HP-PARISC Workstations

 *

 *      (C) 1999-2001 by Helge Deller <deller@gmx.de>

 *

 *

 *      This program is free software; you can redistribute it and/or modify

 *      it under the terms of the GNU General Public License as published by

 *      the Free Software Foundation; either version 2 of the License, or

 *      (at your option) any later version.

 *

 *      This program is distributed in the hope that it will be useful,

 *      but WITHOUT ANY WARRANTY; without even the implied warranty of

 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *      GNU General Public License for more details.

 *

 *      You should have received a copy of the GNU General Public License

 *      along with this program; if not, write to the Free Software

 *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 * based on parport_pc.c by

 *          Grant Guenther <grant@torque.net>

 *          Phil Blundell <Philip.Blundell@pobox.com>

 *          Tim Waugh <tim@cyberelk.demon.co.uk>

 *          Jose Renau <renau@acm.org>

 *          David Campbell

 *          Andrea Arcangeli

 */

#ifndef __DRIVERS_PARPORT_PARPORT_GSC_H

#define __DRIVERS_PARPORT_PARPORT_GSC_H

#include <asm/io.h>

#include <linux/delay.h>

#undef  DEBUG_PARPORT   /* undefine for production */

#define DELAY_TIME      0

#if DELAY_TIME == 0

#define parport_readb   gsc_readb

#define parport_writeb  gsc_writeb

#else

static __inline__ unsigned char parport_readb( unsigned long port )

{

    udelay(DELAY_TIME);

    return gsc_readb(port);

}

static __inline__ void parport_writeb( unsigned char value, unsigned long port )

{

    gsc_writeb(value,port);

    udelay(DELAY_TIME);

}

#endif

/* --- register definitions ------------------------------- */

#define EPPDATA(p)  ((p)->base    + 0x4)

#define EPPADDR(p)  ((p)->base    + 0x3)

#define CONTROL(p)  ((p)->base    + 0x2)

#define STATUS(p)   ((p)->base    + 0x1)

#define DATA(p)     ((p)->base    + 0x0)

struct parport_gsc_private {

        /* Contents of CTR. */

        unsigned char ctr;

        /* Bitmask of writable CTR bits. */

        unsigned char ctr_writable;

        /* Number of bytes per portword. */

        int pword;

        /* Not used yet. */

        int readIntrThreshold;

        int writeIntrThreshold;

        /* buffer suitable for DMA, if DMA enabled */

        char *dma_buf;

        dma_addr_t dma_handle;

        struct pci_dev *dev;

};

static inline void parport_gsc_write_data(struct parport *p, unsigned char d)

{

#ifdef DEBUG_PARPORT

        printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);

#endif

        parport_writeb(d, DATA(p));

}

static inline unsigned char parport_gsc_read_data(struct parport *p)

{

        unsigned char val = parport_readb (DATA (p));

#ifdef DEBUG_PARPORT

        printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",

                p, val);

#endif

        return val;

}

/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that

 * it doesn't do any extra masking. */

static inline unsigned char __parport_gsc_frob_control(struct parport *p,

                                                        unsigned char mask,

                                                        unsigned char val)

{

        struct parport_gsc_private *priv = p->physport->private_data;

        unsigned char ctr = priv->ctr;

#ifdef DEBUG_PARPORT

        printk (KERN_DEBUG

                "__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",

                mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);

#endif

        ctr = (ctr & ~mask) ^ val;

        ctr &= priv->ctr_writable; /* only write writable bits. */

        parport_writeb (ctr, CONTROL (p));

        priv->ctr = ctr;        /* Update soft copy */

        return ctr;

}

static inline void parport_gsc_data_reverse(struct parport *p)

{

        __parport_gsc_frob_control (p, 0x20, 0x20);

}

static inline void parport_gsc_data_forward(struct parport *p)

{

        __parport_gsc_frob_control (p, 0x20, 0x00);

}

static inline void parport_gsc_write_control(struct parport *p,

                                                 unsigned char d)

{

        const unsigned char wm = (PARPORT_CONTROL_STROBE |

                                  PARPORT_CONTROL_AUTOFD |

                                  PARPORT_CONTROL_INIT |

                                  PARPORT_CONTROL_SELECT);

        /* Take this out when drivers have adapted to newer interface. */

        if (d & 0x20) {

                printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",

                        p->name, p->cad->name);

                parport_gsc_data_reverse (p);

        }

        __parport_gsc_frob_control (p, wm, d & wm);

}

static inline unsigned char parport_gsc_read_control(struct parport *p)

{

        const unsigned char rm = (PARPORT_CONTROL_STROBE |

                                  PARPORT_CONTROL_AUTOFD |

                                  PARPORT_CONTROL_INIT |

                                  PARPORT_CONTROL_SELECT);

        const struct parport_gsc_private *priv = p->physport->private_data;

        return priv->ctr & rm; /* Use soft copy */

}

static inline unsigned char parport_gsc_frob_control(struct parport *p,

                                                        unsigned char mask,

                                                        unsigned char val)

{

        const unsigned char wm = (PARPORT_CONTROL_STROBE |

                                  PARPORT_CONTROL_AUTOFD |

                                  PARPORT_CONTROL_INIT |

                                  PARPORT_CONTROL_SELECT);

        /* Take this out when drivers have adapted to newer interface. */

        if (mask & 0x20) {

                printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",

                        p->name, p->cad->name,

                        (val & 0x20) ? "reverse" : "forward");

                if (val & 0x20)

                        parport_gsc_data_reverse (p);

                else

                        parport_gsc_data_forward (p);

        }

        /* Restrict mask and val to control lines. */

        mask &= wm;

        val &= wm;

        return __parport_gsc_frob_control (p, mask, val);

}

static inline unsigned char parport_gsc_read_status(struct parport *p)

{

        return parport_readb (STATUS(p));

}

static inline void parport_gsc_disable_irq(struct parport *p)

{

        __parport_gsc_frob_control (p, 0x10, 0x00);

}

static inline void parport_gsc_enable_irq(struct parport *p)

{

        __parport_gsc_frob_control (p, 0x10, 0x10);

}

extern void parport_gsc_release_resources(struct parport *p);

extern int parport_gsc_claim_resources(struct parport *p);

extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);

extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);

extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);

extern void parport_gsc_inc_use_count(void);

extern void parport_gsc_dec_use_count(void);

extern struct parport *parport_gsc_probe_port(unsigned long base,

                                                unsigned long base_hi,

                                                int irq, int dma,

                                                struct pci_dev *dev);

#endif  /* __DRIVERS_PARPORT_PARPORT_GSC_H */