drivers/parport/parport_gsc.h

   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
  30 static __inline__ unsigned char parport_readb( unsigned long port )
  31 {
  32     udelay(DELAY_TIME);
  33     return gsc_readb(port);
  34 }
  35
  36 static __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
  51 struct 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         struct pci_dev *dev;
  67 };
  68
  69 static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
  70 {
  71 #ifdef DEBUG_PARPORT
  72         printk(KERN_DEBUG "%s(%p,0x%02x)\n", __func__, p, d);
  73 #endif
  74         parport_writeb(d, DATA(p));
  75 }
  76
  77 static inline unsigned char parport_gsc_read_data(struct parport *p)
  78 {
  79         unsigned char val = parport_readb (DATA (p));
  80 #ifdef DEBUG_PARPORT
  81         printk(KERN_DEBUG "%s(%p) = 0x%02x\n", __func__, p, val);
  82 #endif
  83         return val;
  84 }
  85
  86 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
  87  * it doesn't do any extra masking. */
  88 static inline unsigned char __parport_gsc_frob_control(struct parport *p,
  89                                                         unsigned char mask,
  90                                                         unsigned char val)
  91 {
  92         struct parport_gsc_private *priv = p->physport->private_data;
  93         unsigned char ctr = priv->ctr;
  94 #ifdef DEBUG_PARPORT
  95         printk(KERN_DEBUG "%s(%02x,%02x): %02x -> %02x\n",
  96                __func__, mask, val,
  97                ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
  98 #endif
  99         ctr = (ctr & ~mask) ^ val;
 100         ctr &= priv->ctr_writable; /* only write writable bits. */
 101         parport_writeb (ctr, CONTROL (p));
 102         priv->ctr = ctr;        /* Update soft copy */
 103         return ctr;
 104 }
 105
 106 static inline void parport_gsc_data_reverse(struct parport *p)
 107 {
 108         __parport_gsc_frob_control (p, 0x20, 0x20);
 109 }
 110
 111 static inline void parport_gsc_data_forward(struct parport *p)
 112 {
 113         __parport_gsc_frob_control (p, 0x20, 0x00);
 114 }
 115
 116 static inline void parport_gsc_write_control(struct parport *p,
 117                                                  unsigned char d)
 118 {
 119         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 120                                   PARPORT_CONTROL_AUTOFD |
 121                                   PARPORT_CONTROL_INIT |
 122                                   PARPORT_CONTROL_SELECT);
 123
 124         /* Take this out when drivers have adapted to newer interface. */
 125         if (d & 0x20) {
 126                 printk(KERN_DEBUG "%s (%s): use data_reverse for this!\n",
 127                        p->name, p->cad->name);
 128                 parport_gsc_data_reverse (p);
 129         }
 130
 131         __parport_gsc_frob_control (p, wm, d & wm);
 132 }
 133
 134 static inline unsigned char parport_gsc_read_control(struct parport *p)
 135 {
 136         const unsigned char rm = (PARPORT_CONTROL_STROBE |
 137                                   PARPORT_CONTROL_AUTOFD |
 138                                   PARPORT_CONTROL_INIT |
 139                                   PARPORT_CONTROL_SELECT);
 140         const struct parport_gsc_private *priv = p->physport->private_data;
 141         return priv->ctr & rm; /* Use soft copy */
 142 }
 143
 144 static inline unsigned char parport_gsc_frob_control(struct parport *p,
 145                                                         unsigned char mask,
 146                                                         unsigned char val)
 147 {
 148         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 149                                   PARPORT_CONTROL_AUTOFD |
 150                                   PARPORT_CONTROL_INIT |
 151                                   PARPORT_CONTROL_SELECT);
 152
 153         /* Take this out when drivers have adapted to newer interface. */
 154         if (mask & 0x20) {
 155                 printk(KERN_DEBUG "%s (%s): use data_%s for this!\n",
 156                        p->name, p->cad->name,
 157                        (val & 0x20) ? "reverse" : "forward");
 158                 if (val & 0x20)
 159                         parport_gsc_data_reverse (p);
 160                 else
 161                         parport_gsc_data_forward (p);
 162         }
 163
 164         /* Restrict mask and val to control lines. */
 165         mask &= wm;
 166         val &= wm;
 167
 168         return __parport_gsc_frob_control (p, mask, val);
 169 }
 170
 171 static inline unsigned char parport_gsc_read_status(struct parport *p)
 172 {
 173         return parport_readb (STATUS(p));
 174 }
 175
 176 static inline void parport_gsc_disable_irq(struct parport *p)
 177 {
 178         __parport_gsc_frob_control (p, 0x10, 0x00);
 179 }
 180
 181 static inline void parport_gsc_enable_irq(struct parport *p)
 182 {
 183         __parport_gsc_frob_control (p, 0x10, 0x10);
 184 }
 185
 186 extern void parport_gsc_release_resources(struct parport *p);
 187
 188 extern int parport_gsc_claim_resources(struct parport *p);
 189
 190 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
 191
 192 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
 193
 194 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
 195
 196 extern void parport_gsc_inc_use_count(void);
 197
 198 extern void parport_gsc_dec_use_count(void);
 199
 200 #endif  /* __DRIVERS_PARPORT_PARPORT_GSC_H */