include/linux/parport_pc.h

   1 #ifndef __LINUX_PARPORT_PC_H
   2 #define __LINUX_PARPORT_PC_H
   3
   4 #include <asm/io.h>
   5
   6 /* --- register definitions ------------------------------- */
   7
   8 #define ECONTROL(p) ((p)->base_hi + 0x2)
   9 #define CONFIGB(p)  ((p)->base_hi + 0x1)
  10 #define CONFIGA(p)  ((p)->base_hi + 0x0)
  11 #define FIFO(p)     ((p)->base_hi + 0x0)
  12 #define EPPDATA(p)  ((p)->base    + 0x4)
  13 #define EPPADDR(p)  ((p)->base    + 0x3)
  14 #define CONTROL(p)  ((p)->base    + 0x2)
  15 #define STATUS(p)   ((p)->base    + 0x1)
  16 #define DATA(p)     ((p)->base    + 0x0)
  17
  18 struct parport_pc_private {
  19         /* Contents of CTR. */
  20         unsigned char ctr;
  21
  22         /* Bitmask of writable CTR bits. */
  23         unsigned char ctr_writable;
  24
  25         /* Whether or not there's an ECR. */
  26         int ecr;
  27
  28         /* Number of PWords that FIFO will hold. */
  29         int fifo_depth;
  30
  31         /* Number of bytes per portword. */
  32         int pword;
  33
  34         /* Not used yet. */
  35         int readIntrThreshold;
  36         int writeIntrThreshold;
  37
  38         /* buffer suitable for DMA, if DMA enabled */
  39         char *dma_buf;
  40 };
  41
  42 extern __inline__ void parport_pc_write_data(struct parport *p, unsigned char d)
  43 {
  44 #ifdef DEBUG_PARPORT
  45         printk (KERN_DEBUG "parport_pc_write_data(%p,0x%02x)\n", p, d);
  46 #endif
  47         outb(d, DATA(p));
  48 }
  49
  50 extern __inline__ unsigned char parport_pc_read_data(struct parport *p)
  51 {
  52         unsigned char val = inb (DATA (p));
  53 #ifdef DEBUG_PARPORT
  54         printk (KERN_DEBUG "parport_pc_read_data(%p) = 0x%02x\n",
  55                 p, val);
  56 #endif
  57         return val;
  58 }
  59
  60 /* __parport_pc_frob_control differs from parport_pc_frob_control in that
  61  * it doesn't do any extra masking. */
  62 static __inline__ unsigned char __parport_pc_frob_control (struct parport *p,
  63                                                            unsigned char mask,
  64                                                            unsigned char val)
  65 {
  66         struct parport_pc_private *priv = p->physport->private_data;
  67         unsigned char ctr = priv->ctr;
  68 #ifdef DEBUG_PARPORT
  69         printk (KERN_DEBUG
  70                 "__parport_pc_frob_control(%02x,%02x): %02x -> %02x\n",
  71                 mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
  72 #endif
  73         ctr = (ctr & ~mask) ^ val;
  74         ctr &= priv->ctr_writable; /* only write writable bits. */
  75         outb (ctr, CONTROL (p));
  76         priv->ctr = ctr;        /* Update soft copy */
  77         return ctr;
  78 }
  79
  80 extern __inline__ void parport_pc_data_reverse (struct parport *p)
  81 {
  82         __parport_pc_frob_control (p, 0x20, 0x20);
  83 }
  84
  85 extern __inline__ void parport_pc_data_forward (struct parport *p)
  86 {
  87         __parport_pc_frob_control (p, 0x20, 0x00);
  88 }
  89
  90 extern __inline__ void parport_pc_write_control (struct parport *p,
  91                                                  unsigned char d)
  92 {
  93         const unsigned char wm = (PARPORT_CONTROL_STROBE |
  94                                   PARPORT_CONTROL_AUTOFD |
  95                                   PARPORT_CONTROL_INIT |
  96                                   PARPORT_CONTROL_SELECT);
  97
  98         /* Take this out when drivers have adapted to newer interface. */
  99         if (d & 0x20) {
 100                 printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
 101                         p->name, p->cad->name);
 102                 parport_pc_data_reverse (p);
 103         }
 104
 105         __parport_pc_frob_control (p, wm, d & wm);
 106 }
 107
 108 extern __inline__ unsigned char parport_pc_read_control(struct parport *p)
 109 {
 110         const unsigned char rm = (PARPORT_CONTROL_STROBE |
 111                                   PARPORT_CONTROL_AUTOFD |
 112                                   PARPORT_CONTROL_INIT |
 113                                   PARPORT_CONTROL_SELECT);
 114         const struct parport_pc_private *priv = p->physport->private_data;
 115         return priv->ctr & rm; /* Use soft copy */
 116 }
 117
 118 extern __inline__ unsigned char parport_pc_frob_control (struct parport *p,
 119                                                          unsigned char mask,
 120                                                          unsigned char val)
 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 (mask & 0x20) {
 129                 printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
 130                         p->name, p->cad->name,
 131                         (val & 0x20) ? "reverse" : "forward");
 132                 if (val & 0x20)
 133                         parport_pc_data_reverse (p);
 134                 else
 135                         parport_pc_data_forward (p);
 136         }
 137
 138         /* Restrict mask and val to control lines. */
 139         mask &= wm;
 140         val &= wm;
 141
 142         return __parport_pc_frob_control (p, mask, val);
 143 }
 144
 145 extern __inline__ unsigned char parport_pc_read_status(struct parport *p)
 146 {
 147         return inb(STATUS(p));
 148 }
 149
 150
 151 extern __inline__ void parport_pc_disable_irq(struct parport *p)
 152 {
 153         __parport_pc_frob_control (p, 0x10, 0x00);
 154 }
 155
 156 extern __inline__ void parport_pc_enable_irq(struct parport *p)
 157 {
 158         __parport_pc_frob_control (p, 0x10, 0x10);
 159 }
 160
 161 extern void parport_pc_release_resources(struct parport *p);
 162
 163 extern int parport_pc_claim_resources(struct parport *p);
 164
 165 extern void parport_pc_init_state(struct pardevice *, struct parport_state *s);
 166
 167 extern void parport_pc_save_state(struct parport *p, struct parport_state *s);
 168
 169 extern void parport_pc_restore_state(struct parport *p, struct parport_state *s);
 170
 171 extern void parport_pc_inc_use_count(void);
 172
 173 extern void parport_pc_dec_use_count(void);
 174
 175 /* PCMCIA code will want to get us to look at a port.  Provide a mechanism. */
 176 extern struct parport *parport_pc_probe_port (unsigned long base,
 177                                               unsigned long base_hi,
 178                                               int irq, int dma);
 179
 180 #endif