LXR linux/drivers/parport/parport

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 *      Low-level parallel-support for PC-style hardware integrated in the
   4 *      LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
   5 *
   6 *      (C) 1999-2001 by Helge Deller <deller@gmx.de>
   7 *
   8 * based on parport_pc.c by
   9 *          Grant Guenther <grant@torque.net>
  10 *          Phil Blundell <Philip.Blundell@pobox.com>
  11 *          Tim Waugh <tim@cyberelk.demon.co.uk>
  12 *          Jose Renau <renau@acm.org>
  13 *          David Campbell
  14 *          Andrea Arcangeli
  15 */
  16
  17#ifndef __DRIVERS_PARPORT_PARPORT_GSC_H
  18#define __DRIVERS_PARPORT_PARPORT_GSC_H
  19
  20#include <asm/io.h>
  21#include <linux/delay.h>
  22
  23#undef  DEBUG_PARPORT   /* undefine for production */
  24#define DELAY_TIME      0
  25
  26#if DELAY_TIME == 0
  27#define parport_readb   gsc_readb
  28#define parport_writeb  gsc_writeb
  29#else
  30static __inline__ unsigned char parport_readb( unsigned long port )
  31{
  32    udelay(DELAY_TIME);
  33    return gsc_readb(port);
  34}
  35
  36static __inline__ void parport_writeb( unsigned char value, unsigned long port )
  37{
  38    gsc_writeb(value,port);
  39    udelay(DELAY_TIME);
  40}
  41#endif
  42
  43/* --- register definitions ------------------------------- */
  44
  45#define EPPDATA(p)  ((p)->base    + 0x4)
  46#define EPPADDR(p)  ((p)->base    + 0x3)
  47#define CONTROL(p)  ((p)->base    + 0x2)
  48#define STATUS(p)   ((p)->base    + 0x1)
  49#define DATA(p)     ((p)->base    + 0x0)
  50
  51struct parport_gsc_private {
  52        /* Contents of CTR. */
  53        unsigned char ctr;
  54
  55        /* Bitmask of writable CTR bits. */
  56        unsigned char ctr_writable;
  57
  58        /* Number of bytes per portword. */
  59        int pword;
  60
  61        /* Not used yet. */
  62        int readIntrThreshold;
  63        int writeIntrThreshold;
  64
  65        /* buffer suitable for DMA, if DMA enabled */
  66        char *dma_buf;
  67        dma_addr_t dma_handle;
  68        struct pci_dev *dev;
  69};
  70
  71static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
  72{
  73#ifdef DEBUG_PARPORT
  74        printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);
  75#endif
  76        parport_writeb(d, DATA(p));
  77}
  78
  79static inline unsigned char parport_gsc_read_data(struct parport *p)
  80{
  81        unsigned char val = parport_readb (DATA (p));
  82#ifdef DEBUG_PARPORT
  83        printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",
  84                p, val);
  85#endif
  86        return val;
  87}
  88
  89/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
  90 * it doesn't do any extra masking. */
  91static inline unsigned char __parport_gsc_frob_control(struct parport *p,
  92                                                        unsigned char mask,
  93                                                        unsigned char val)
  94{
  95        struct parport_gsc_private *priv = p->physport->private_data;
  96        unsigned char ctr = priv->ctr;
  97#ifdef DEBUG_PARPORT
  98        printk (KERN_DEBUG
  99                "__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",
 100                mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
 101#endif
 102        ctr = (ctr & ~mask) ^ val;
 103        ctr &= priv->ctr_writable; /* only write writable bits. */
 104        parport_writeb (ctr, CONTROL (p));
 105        priv->ctr = ctr;        /* Update soft copy */
 106        return ctr;
 107}
 108
 109static inline void parport_gsc_data_reverse(struct parport *p)
 110{
 111        __parport_gsc_frob_control (p, 0x20, 0x20);
 112}
 113
 114static inline void parport_gsc_data_forward(struct parport *p)
 115{
 116        __parport_gsc_frob_control (p, 0x20, 0x00);
 117}
 118
 119static inline void parport_gsc_write_control(struct parport *p,
 120                                                 unsigned char d)
 121{
 122        const unsigned char wm = (PARPORT_CONTROL_STROBE |
 123                                  PARPORT_CONTROL_AUTOFD |
 124                                  PARPORT_CONTROL_INIT |
 125                                  PARPORT_CONTROL_SELECT);
 126
 127        /* Take this out when drivers have adapted to newer interface. */
 128        if (d & 0x20) {
 129                printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
 130                        p->name, p->cad->name);
 131                parport_gsc_data_reverse (p);
 132        }
 133
 134        __parport_gsc_frob_control (p, wm, d & wm);
 135}
 136
 137static inline unsigned char parport_gsc_read_control(struct parport *p)
 138{
 139        const unsigned char rm = (PARPORT_CONTROL_STROBE |
 140                                  PARPORT_CONTROL_AUTOFD |
 141                                  PARPORT_CONTROL_INIT |
 142                                  PARPORT_CONTROL_SELECT);
 143        const struct parport_gsc_private *priv = p->physport->private_data;
 144        return priv->ctr & rm; /* Use soft copy */
 145}
 146
 147static inline unsigned char parport_gsc_frob_control(struct parport *p,
 148                                                        unsigned char mask,
 149                                                        unsigned char val)
 150{
 151        const unsigned char wm = (PARPORT_CONTROL_STROBE |
 152                                  PARPORT_CONTROL_AUTOFD |
 153                                  PARPORT_CONTROL_INIT |
 154                                  PARPORT_CONTROL_SELECT);
 155
 156        /* Take this out when drivers have adapted to newer interface. */
 157        if (mask & 0x20) {
 158                printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
 159                        p->name, p->cad->name,
 160                        (val & 0x20) ? "reverse" : "forward");
 161                if (val & 0x20)
 162                        parport_gsc_data_reverse (p);
 163                else
 164                        parport_gsc_data_forward (p);
 165        }
 166
 167        /* Restrict mask and val to control lines. */
 168        mask &= wm;
 169        val &= wm;
 170
 171        return __parport_gsc_frob_control (p, mask, val);
 172}
 173
 174static inline unsigned char parport_gsc_read_status(struct parport *p)
 175{
 176        return parport_readb (STATUS(p));
 177}
 178
 179static inline void parport_gsc_disable_irq(struct parport *p)
 180{
 181        __parport_gsc_frob_control (p, 0x10, 0x00);
 182}
 183
 184static inline void parport_gsc_enable_irq(struct parport *p)
 185{
 186        __parport_gsc_frob_control (p, 0x10, 0x10);
 187}
 188
 189extern void parport_gsc_release_resources(struct parport *p);
 190
 191extern int parport_gsc_claim_resources(struct parport *p);
 192
 193extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
 194
 195extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
 196
 197extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
 198
 199extern void parport_gsc_inc_use_count(void);
 200
 201extern void parport_gsc_dec_use_count(void);
 202
 203extern struct parport *parport_gsc_probe_port(unsigned long base,
 204                                                unsigned long base_hi,
 205                                                int irq, int dma,
 206                                                struct parisc_device *padev);
 207
 208#endif  /* __DRIVERS_PARPORT_PARPORT_GSC_H */
 209