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 "%s(%p,0x%02x)\n", __func__, 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 "%s(%p) = 0x%02x\n", __func__, p, val);
  84#endif
  85        return val;
  86}
  87
  88/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
  89 * it doesn't do any extra masking. */
  90static inline unsigned char __parport_gsc_frob_control(struct parport *p,
  91                                                        unsigned char mask,
  92                                                        unsigned char val)
  93{
  94        struct parport_gsc_private *priv = p->physport->private_data;
  95        unsigned char ctr = priv->ctr;
  96#ifdef DEBUG_PARPORT
  97        printk(KERN_DEBUG "%s(%02x,%02x): %02x -> %02x\n",
  98               __func__, mask, val,
  99               ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
 100#endif
 101        ctr = (ctr & ~mask) ^ val;
 102        ctr &= priv->ctr_writable; /* only write writable bits. */
 103        parport_writeb (ctr, CONTROL (p));
 104        priv->ctr = ctr;        /* Update soft copy */
 105        return ctr;
 106}
 107
 108static inline void parport_gsc_data_reverse(struct parport *p)
 109{
 110        __parport_gsc_frob_control (p, 0x20, 0x20);
 111}
 112
 113static inline void parport_gsc_data_forward(struct parport *p)
 114{
 115        __parport_gsc_frob_control (p, 0x20, 0x00);
 116}
 117
 118static inline void parport_gsc_write_control(struct parport *p,
 119                                                 unsigned char d)
 120{
 121        const unsigned char wm = (PARPORT_CONTROL_STROBE |
 122                                  PARPORT_CONTROL_AUTOFD |
 123                                  PARPORT_CONTROL_INIT |
 124                                  PARPORT_CONTROL_SELECT);
 125
 126        /* Take this out when drivers have adapted to newer interface. */
 127        if (d & 0x20) {
 128                printk(KERN_DEBUG "%s (%s): use data_reverse for this!\n",
 129                       p->name, p->cad->name);
 130                parport_gsc_data_reverse (p);
 131        }
 132
 133        __parport_gsc_frob_control (p, wm, d & wm);
 134}
 135
 136static inline unsigned char parport_gsc_read_control(struct parport *p)
 137{
 138        const unsigned char rm = (PARPORT_CONTROL_STROBE |
 139                                  PARPORT_CONTROL_AUTOFD |
 140                                  PARPORT_CONTROL_INIT |
 141                                  PARPORT_CONTROL_SELECT);
 142        const struct parport_gsc_private *priv = p->physport->private_data;
 143        return priv->ctr & rm; /* Use soft copy */
 144}
 145
 146static inline unsigned char parport_gsc_frob_control(struct parport *p,
 147                                                        unsigned char mask,
 148                                                        unsigned char val)
 149{
 150        const unsigned char wm = (PARPORT_CONTROL_STROBE |
 151                                  PARPORT_CONTROL_AUTOFD |
 152                                  PARPORT_CONTROL_INIT |
 153                                  PARPORT_CONTROL_SELECT);
 154
 155        /* Take this out when drivers have adapted to newer interface. */
 156        if (mask & 0x20) {
 157                printk(KERN_DEBUG "%s (%s): use data_%s for this!\n",
 158                       p->name, p->cad->name,
 159                       (val & 0x20) ? "reverse" : "forward");
 160                if (val & 0x20)
 161                        parport_gsc_data_reverse (p);
 162                else
 163                        parport_gsc_data_forward (p);
 164        }
 165
 166        /* Restrict mask and val to control lines. */
 167        mask &= wm;
 168        val &= wm;
 169
 170        return __parport_gsc_frob_control (p, mask, val);
 171}
 172
 173static inline unsigned char parport_gsc_read_status(struct parport *p)
 174{
 175        return parport_readb (STATUS(p));
 176}
 177
 178static inline void parport_gsc_disable_irq(struct parport *p)
 179{
 180        __parport_gsc_frob_control (p, 0x10, 0x00);
 181}
 182
 183static inline void parport_gsc_enable_irq(struct parport *p)
 184{
 185        __parport_gsc_frob_control (p, 0x10, 0x10);
 186}
 187
 188extern void parport_gsc_release_resources(struct parport *p);
 189
 190extern int parport_gsc_claim_resources(struct parport *p);
 191
 192extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
 193
 194extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
 195
 196extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
 197
 198extern void parport_gsc_inc_use_count(void);
 199
 200extern void parport_gsc_dec_use_count(void);
 201
 202extern struct parport *parport_gsc_probe_port(unsigned long base,
 203                                                unsigned long base_hi,
 204                                                int irq, int dma,
 205                                                struct parisc_device *padev);
 206
 207#endif  /* __DRIVERS_PARPORT_PARPORT_GSC_H */
 208