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         dma_addr_t dma_handle;
  41         struct list_head list;
  42         struct parport *port;
  43 };
  44
  45 struct parport_pc_via_data
  46 {
  47         /* ISA PnP IRQ routing register 1 */
  48         u8 via_pci_parport_irq_reg;
  49         /* ISA PnP DMA request routing register */
  50         u8 via_pci_parport_dma_reg;
  51         /* Register and value to enable SuperIO configuration access */
  52         u8 via_pci_superio_config_reg;
  53         u8 via_pci_superio_config_data;
  54         /* SuperIO function register number */
  55         u8 viacfg_function;
  56         /* parallel port control register number */
  57         u8 viacfg_parport_control;
  58         /* Parallel port base address register */
  59         u8 viacfg_parport_base;
  60 };
  61
  62 static __inline__ void parport_pc_write_data(struct parport *p, unsigned char d)
  63 {
  64 #ifdef DEBUG_PARPORT
  65         printk (KERN_DEBUG "parport_pc_write_data(%p,0x%02x)\n", p, d);
  66 #endif
  67         outb(d, DATA(p));
  68 }
  69
  70 static __inline__ unsigned char parport_pc_read_data(struct parport *p)
  71 {
  72         unsigned char val = inb (DATA (p));
  73 #ifdef DEBUG_PARPORT
  74         printk (KERN_DEBUG "parport_pc_read_data(%p) = 0x%02x\n",
  75                 p, val);
  76 #endif
  77         return val;
  78 }
  79
  80 #ifdef DEBUG_PARPORT
  81 static inline void dump_parport_state (char *str, struct parport *p)
  82 {
  83         /* here's hoping that reading these ports won't side-effect anything underneath */
  84         unsigned char ecr = inb (ECONTROL (p));
  85         unsigned char dcr = inb (CONTROL (p));
  86         unsigned char dsr = inb (STATUS (p));
  87         static const char *const ecr_modes[] = {"SPP", "PS2", "PPFIFO", "ECP", "xXx", "yYy", "TST", "CFG"};
  88         const struct parport_pc_private *priv = p->physport->private_data;
  89         int i;
  90
  91         printk (KERN_DEBUG "*** parport state (%s): ecr=[%s", str, ecr_modes[(ecr & 0xe0) >> 5]);
  92         if (ecr & 0x10) printk (",nErrIntrEn");
  93         if (ecr & 0x08) printk (",dmaEn");
  94         if (ecr & 0x04) printk (",serviceIntr");
  95         if (ecr & 0x02) printk (",f_full");
  96         if (ecr & 0x01) printk (",f_empty");
  97         for (i=0; i<2; i++) {
  98                 printk ("]  dcr(%s)=[", i ? "soft" : "hard");
  99                 dcr = i ? priv->ctr : inb (CONTROL (p));
 100
 101                 if (dcr & 0x20) {
 102                         printk ("rev");
 103                 } else {
 104                         printk ("fwd");
 105                 }
 106                 if (dcr & 0x10) printk (",ackIntEn");
 107                 if (!(dcr & 0x08)) printk (",N-SELECT-IN");
 108                 if (dcr & 0x04) printk (",N-INIT");
 109                 if (!(dcr & 0x02)) printk (",N-AUTOFD");
 110                 if (!(dcr & 0x01)) printk (",N-STROBE");
 111         }
 112         printk ("]  dsr=[");
 113         if (!(dsr & 0x80)) printk ("BUSY");
 114         if (dsr & 0x40) printk (",N-ACK");
 115         if (dsr & 0x20) printk (",PERROR");
 116         if (dsr & 0x10) printk (",SELECT");
 117         if (dsr & 0x08) printk (",N-FAULT");
 118         printk ("]\n");
 119         return;
 120 }
 121 #else   /* !DEBUG_PARPORT */
 122 #define dump_parport_state(args...)
 123 #endif  /* !DEBUG_PARPORT */
 124
 125 /* __parport_pc_frob_control differs from parport_pc_frob_control in that
 126  * it doesn't do any extra masking. */
 127 static __inline__ unsigned char __parport_pc_frob_control (struct parport *p,
 128                                                            unsigned char mask,
 129                                                            unsigned char val)
 130 {
 131         struct parport_pc_private *priv = p->physport->private_data;
 132         unsigned char ctr = priv->ctr;
 133 #ifdef DEBUG_PARPORT
 134         printk (KERN_DEBUG
 135                 "__parport_pc_frob_control(%02x,%02x): %02x -> %02x\n",
 136                 mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
 137 #endif
 138         ctr = (ctr & ~mask) ^ val;
 139         ctr &= priv->ctr_writable; /* only write writable bits. */
 140         outb (ctr, CONTROL (p));
 141         priv->ctr = ctr;        /* Update soft copy */
 142         return ctr;
 143 }
 144
 145 static __inline__ void parport_pc_data_reverse (struct parport *p)
 146 {
 147         __parport_pc_frob_control (p, 0x20, 0x20);
 148 }
 149
 150 static __inline__ void parport_pc_data_forward (struct parport *p)
 151 {
 152         __parport_pc_frob_control (p, 0x20, 0x00);
 153 }
 154
 155 static __inline__ void parport_pc_write_control (struct parport *p,
 156                                                  unsigned char d)
 157 {
 158         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 159                                   PARPORT_CONTROL_AUTOFD |
 160                                   PARPORT_CONTROL_INIT |
 161                                   PARPORT_CONTROL_SELECT);
 162
 163         /* Take this out when drivers have adapted to newer interface. */
 164         if (d & 0x20) {
 165                 printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
 166                         p->name, p->cad->name);
 167                 parport_pc_data_reverse (p);
 168         }
 169
 170         __parport_pc_frob_control (p, wm, d & wm);
 171 }
 172
 173 static __inline__ unsigned char parport_pc_read_control(struct parport *p)
 174 {
 175         const unsigned char rm = (PARPORT_CONTROL_STROBE |
 176                                   PARPORT_CONTROL_AUTOFD |
 177                                   PARPORT_CONTROL_INIT |
 178                                   PARPORT_CONTROL_SELECT);
 179         const struct parport_pc_private *priv = p->physport->private_data;
 180         return priv->ctr & rm; /* Use soft copy */
 181 }
 182
 183 static __inline__ unsigned char parport_pc_frob_control (struct parport *p,
 184                                                          unsigned char mask,
 185                                                          unsigned char val)
 186 {
 187         const unsigned char wm = (PARPORT_CONTROL_STROBE |
 188                                   PARPORT_CONTROL_AUTOFD |
 189                                   PARPORT_CONTROL_INIT |
 190                                   PARPORT_CONTROL_SELECT);
 191
 192         /* Take this out when drivers have adapted to newer interface. */
 193         if (mask & 0x20) {
 194                 printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
 195                         p->name, p->cad->name,
 196                         (val & 0x20) ? "reverse" : "forward");
 197                 if (val & 0x20)
 198                         parport_pc_data_reverse (p);
 199                 else
 200                         parport_pc_data_forward (p);
 201         }
 202
 203         /* Restrict mask and val to control lines. */
 204         mask &= wm;
 205         val &= wm;
 206
 207         return __parport_pc_frob_control (p, mask, val);
 208 }
 209
 210 static __inline__ unsigned char parport_pc_read_status(struct parport *p)
 211 {
 212         return inb(STATUS(p));
 213 }
 214
 215
 216 static __inline__ void parport_pc_disable_irq(struct parport *p)
 217 {
 218         __parport_pc_frob_control (p, 0x10, 0x00);
 219 }
 220
 221 static __inline__ void parport_pc_enable_irq(struct parport *p)
 222 {
 223         __parport_pc_frob_control (p, 0x10, 0x10);
 224 }
 225
 226 extern void parport_pc_release_resources(struct parport *p);
 227
 228 extern int parport_pc_claim_resources(struct parport *p);
 229
 230 /* PCMCIA code will want to get us to look at a port.  Provide a mechanism. */
 231 extern struct parport *parport_pc_probe_port(unsigned long base,
 232                                              unsigned long base_hi,
 233                                              int irq, int dma,
 234                                              struct device *dev,
 235                                              int irqflags);
 236 extern void parport_pc_unregister_port(struct parport *p);
 237
 238 #endif