drivers/parport/parport_gsc.h

   1 /*
   2  *      Low-level parallel-support for PC-style hardware integrated in the
   3  *      LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
   4  *
   5  *      (C) 1999-2001 by Helge Deller <deller@gmx.de>
   6  *
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  * based on parport_pc.c by
  23  *          Grant Guenther <grant@torque.net>
  24  *          Phil Blundell <Philip.Blundell@pobox.com>
  25  *          Tim Waugh <tim@cyberelk.demon.co.uk>
  26  *          Jose Renau <renau@acm.org>
  27  *          David Campbell
  28  *          Andrea Arcangeli
  29  */
  30
  31 #ifndef __DRIVERS_PARPORT_PARPORT_GSC_H
  32 #define __DRIVERS_PARPORT_PARPORT_GSC_H
  33
  34 #include <asm/io.h>
  35 #include <linux/delay.h>
  36
  37 #undef  DEBUG_PARPORT   /* undefine for production */
  38 #define DELAY_TIME      0
  39
  40 #if DELAY_TIME == 0
  41 #define parport_readb   gsc_readb
  42 #define parport_writeb  gsc_writeb
  43 #else
  44 static __inline__ unsigned char parport_readb( unsigned long port )
  45 {
  46     udelay(DELAY_TIME);
  47     return gsc_readb(port);
  48 }
  49
  50 static __inline__ void parport_writeb( unsigned char value, unsigned long port )
  51 {
  52     gsc_writeb(value,port);
  53     udelay(DELAY_TIME);
  54 }
  55 #endif
  56
  57 /* --- register definitions ------------------------------- */
  58
  59 #define EPPDATA(p)  ((p)->base    + 0x4)
  60 #define EPPADDR(p)  ((p)->base    + 0x3)
  61 #define CONTROL(p)  ((p)->base    + 0x2)
  62 #define STATUS(p)   ((p)->base    + 0x1)
  63 #define DATA(p)     ((p)->base    + 0x0)
  64
  65 struct parport_gsc_private {
  66         /* Contents of CTR. */
  67         unsigned char ctr;
  68
  69         /* Bitmask of writable CTR bits. */
  70         unsigned char ctr_writable;
  71
  72         /* Number of bytes per portword. */
  73         int pword;
  74
  75         /* Not used yet. */
  76         int readIntrThreshold;
  77         int writeIntrThreshold;
  78
  79         /* buffer suitable for DMA, if DMA enabled */
  80         char *dma_buf;
  81         dma_addr_t dma_handle;
  82         struct pci_dev *dev;
  83 };
  84
  85 static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
  86 {
  87 #ifdef DEBUG_PARPORT
  88         printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);
  89 #endif
  90         parport_writeb(d, DATA(p));
  91 }
  92
  93 static inline unsigned char parport_gsc_read_data(struct parport *p)
  94 {
  95         unsigned char val = parport_readb (DATA (p));
  96 #ifdef DEBUG_PARPORT
  97         printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",
  98                 p, val);
  99 #endif
 100         return val;
 101 }
 102
 103 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
 104  * it doesn't do any extra masking. */
 105 static inline unsigned char __parport_gsc_frob_control(struct parport *p,
 106                                                         unsigned char mask,
 107                                                         unsigned char val)
 108 {
 109         struct parport_gsc_private *priv = p->physport->private_data;
 110         unsigned char ctr = priv->ctr;
 111 #ifdef DEBUG_PARPORT
 112         printk (KERN_DEBUG
 113                 "__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",
 114                 mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
 115 #endif
 116         ctr = (ctr & ~mask) ^ val;
 117         ctr &= priv->ctr_writable; /* only write writable bits. */
 118         parport_writeb (ctr, CONTROL (p));
 119         priv->ctr = ctr;        /* Update soft copy */
 120         return ctr;
 121 }
 122
 123 static inline void parport_gsc_data_reverse(struct parport *p)
 124 {
 125         __parport_gsc_frob_control (p, 0x20, 0x20);
 126 }
 127
 128 static inline void parport_gsc_data_forward(struct parport *p)
 129 {
 130         __parport_gsc_frob_control (p, 0x20, 0x00);
 131 }
 132
 133 static inline void parport_gsc_write_control(struct parport *p,
 134                                                  unsigned char d)
 135 {
 136         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 137                                   PARPORT_CONTROL_AUTOFD |
 138                                   PARPORT_CONTROL_INIT |
 139                                   PARPORT_CONTROL_SELECT);
 140
 141         /* Take this out when drivers have adapted to newer interface. */
 142         if (d & 0x20) {
 143                 printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
 144                         p->name, p->cad->name);
 145                 parport_gsc_data_reverse (p);
 146         }
 147
 148         __parport_gsc_frob_control (p, wm, d & wm);
 149 }
 150
 151 static inline unsigned char parport_gsc_read_control(struct parport *p)
 152 {
 153         const unsigned char rm = (PARPORT_CONTROL_STROBE |
 154                                   PARPORT_CONTROL_AUTOFD |
 155                                   PARPORT_CONTROL_INIT |
 156                                   PARPORT_CONTROL_SELECT);
 157         const struct parport_gsc_private *priv = p->physport->private_data;
 158         return priv->ctr & rm; /* Use soft copy */
 159 }
 160
 161 static inline unsigned char parport_gsc_frob_control(struct parport *p,
 162                                                         unsigned char mask,
 163                                                         unsigned char val)
 164 {
 165         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 166                                   PARPORT_CONTROL_AUTOFD |
 167                                   PARPORT_CONTROL_INIT |
 168                                   PARPORT_CONTROL_SELECT);
 169
 170         /* Take this out when drivers have adapted to newer interface. */
 171         if (mask & 0x20) {
 172                 printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
 173                         p->name, p->cad->name,
 174                         (val & 0x20) ? "reverse" : "forward");
 175                 if (val & 0x20)
 176                         parport_gsc_data_reverse (p);
 177                 else
 178                         parport_gsc_data_forward (p);
 179         }
 180
 181         /* Restrict mask and val to control lines. */
 182         mask &= wm;
 183         val &= wm;
 184
 185         return __parport_gsc_frob_control (p, mask, val);
 186 }
 187
 188 static inline unsigned char parport_gsc_read_status(struct parport *p)
 189 {
 190         return parport_readb (STATUS(p));
 191 }
 192
 193 static inline void parport_gsc_disable_irq(struct parport *p)
 194 {
 195         __parport_gsc_frob_control (p, 0x10, 0x00);
 196 }
 197
 198 static inline void parport_gsc_enable_irq(struct parport *p)
 199 {
 200         __parport_gsc_frob_control (p, 0x10, 0x10);
 201 }
 202
 203 extern void parport_gsc_release_resources(struct parport *p);
 204
 205 extern int parport_gsc_claim_resources(struct parport *p);
 206
 207 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
 208
 209 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
 210
 211 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
 212
 213 extern void parport_gsc_inc_use_count(void);
 214
 215 extern void parport_gsc_dec_use_count(void);
 216
 217 extern struct parport *parport_gsc_probe_port(unsigned long base,
 218                                                 unsigned long base_hi,
 219                                                 int irq, int dma,
 220                                                 struct parisc_device *padev);
 221
 222 #endif  /* __DRIVERS_PARPORT_PARPORT_GSC_H */