linux/include/linux/parport_pc.h
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   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
  18struct 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
  45struct 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
  62static __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
  70static __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
  81static 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. */
 127static __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
 145static __inline__ void parport_pc_data_reverse (struct parport *p)
 146{
 147        __parport_pc_frob_control (p, 0x20, 0x20);
 148}
 149
 150static __inline__ void parport_pc_data_forward (struct parport *p)
 151{
 152        __parport_pc_frob_control (p, 0x20, 0x00);
 153}
 154
 155static __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
 173static __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
 183static __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
 210static __inline__ unsigned char parport_pc_read_status(struct parport *p)
 211{
 212        return inb(STATUS(p));
 213}
 214
 215
 216static __inline__ void parport_pc_disable_irq(struct parport *p)
 217{
 218        __parport_pc_frob_control (p, 0x10, 0x00);
 219}
 220
 221static __inline__ void parport_pc_enable_irq(struct parport *p)
 222{
 223        __parport_pc_frob_control (p, 0x10, 0x10);
 224}
 225
 226extern void parport_pc_release_resources(struct parport *p);
 227
 228extern 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. */
 231extern 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);
 236extern void parport_pc_unregister_port(struct parport *p);
 237
 238#endif
 239
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