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         char *dma_buf;
  67         dma_addr_t dma_handle;
  68         struct pci_dev *dev;
  69 };
  70
  71 static 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
  79 static 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. */
  91 static 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
 109 static inline void parport_gsc_data_reverse(struct parport *p)
 110 {
 111         __parport_gsc_frob_control (p, 0x20, 0x20);
 112 }
 113
 114 static inline void parport_gsc_data_forward(struct parport *p)
 115 {
 116         __parport_gsc_frob_control (p, 0x20, 0x00);
 117 }
 118
 119 static 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
 137 static 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
 147 static 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
 174 static inline unsigned char parport_gsc_read_status(struct parport *p)
 175 {
 176         return parport_readb (STATUS(p));
 177 }
 178
 179 static inline void parport_gsc_disable_irq(struct parport *p)
 180 {
 181         __parport_gsc_frob_control (p, 0x10, 0x00);
 182 }
 183
 184 static inline void parport_gsc_enable_irq(struct parport *p)
 185 {
 186         __parport_gsc_frob_control (p, 0x10, 0x10);
 187 }
 188
 189 extern void parport_gsc_release_resources(struct parport *p);
 190
 191 extern int parport_gsc_claim_resources(struct parport *p);
 192
 193 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
 194
 195 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
 196
 197 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
 198
 199 extern void parport_gsc_inc_use_count(void);
 200
 201 extern void parport_gsc_dec_use_count(void);
 202
 203 extern 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 */