include/linux/parport

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This source file includes following definitions.
parport_pc_write_data
parport_pc_read_data
dump_parport_state
__parport_pc_frob_control
parport_pc_data_reverse
parport_pc_data_forward
parport_pc_write_control
parport_pc_read_control
parport_pc_frob_control
parport_pc_read_status
parport_pc_disable_irq
parport_pc_enable_irq
#ifndef __LINUX_PARPORT_PC_H
#define __LINUX_PARPORT_PC_H

#include <asm/io.h>

/* --- register definitions ------------------------------- */

#define ECONTROL(p) ((p)->base_hi + 0x2)
#define CONFIGB(p)  ((p)->base_hi + 0x1)
#define CONFIGA(p)  ((p)->base_hi + 0x0)
#define FIFO(p)     ((p)->base_hi + 0x0)
#define EPPDATA(p)  ((p)->base    + 0x4)
#define EPPADDR(p)  ((p)->base    + 0x3)
#define CONTROL(p)  ((p)->base    + 0x2)
#define STATUS(p)   ((p)->base    + 0x1)
#define DATA(p)     ((p)->base    + 0x0)

struct parport_pc_private {
        /* Contents of CTR. */
        unsigned char ctr;

        /* Bitmask of writable CTR bits. */
        unsigned char ctr_writable;

        /* Whether or not there's an ECR. */
        int ecr;

        /* Number of PWords that FIFO will hold. */
        int fifo_depth;

        /* Number of bytes per portword. */
        int pword;

        /* Not used yet. */
        int readIntrThreshold;
        int writeIntrThreshold;

        /* buffer suitable for DMA, if DMA enabled */
        char *dma_buf;
        dma_addr_t dma_handle;
        struct list_head list;
        struct parport *port;
};

struct parport_pc_via_data
{
        /* ISA PnP IRQ routing register 1 */
        u8 via_pci_parport_irq_reg;
        /* ISA PnP DMA request routing register */
        u8 via_pci_parport_dma_reg;
        /* Register and value to enable SuperIO configuration access */
        u8 via_pci_superio_config_reg;
        u8 via_pci_superio_config_data;
        /* SuperIO function register number */
        u8 viacfg_function;
        /* parallel port control register number */
        u8 viacfg_parport_control;
        /* Parallel port base address register */
        u8 viacfg_parport_base;
};

static __inline__ void parport_pc_write_data(struct parport *p, unsigned char d)
{
#ifdef DEBUG_PARPORT
        printk (KERN_DEBUG "parport_pc_write_data(%p,0x%02x)\n", p, d);
#endif
        outb(d, DATA(p));
}

static __inline__ unsigned char parport_pc_read_data(struct parport *p)
{
        unsigned char val = inb (DATA (p));
#ifdef DEBUG_PARPORT
        printk (KERN_DEBUG "parport_pc_read_data(%p) = 0x%02x\n",
                p, val);
#endif
        return val;
}

#ifdef DEBUG_PARPORT
static inline void dump_parport_state (char *str, struct parport *p)
{
        /* here's hoping that reading these ports won't side-effect anything underneath */
        unsigned char ecr = inb (ECONTROL (p));
        unsigned char dcr = inb (CONTROL (p));
        unsigned char dsr = inb (STATUS (p));
        static const char *const ecr_modes[] = {"SPP", "PS2", "PPFIFO", "ECP", "xXx", "yYy", "TST", "CFG"};
        const struct parport_pc_private *priv = p->physport->private_data;
        int i;

        printk (KERN_DEBUG "*** parport state (%s): ecr=[%s", str, ecr_modes[(ecr & 0xe0) >> 5]);
        if (ecr & 0x10) printk (",nErrIntrEn");
        if (ecr & 0x08) printk (",dmaEn");
        if (ecr & 0x04) printk (",serviceIntr");
        if (ecr & 0x02) printk (",f_full");
        if (ecr & 0x01) printk (",f_empty");
        for (i=0; i<2; i++) {
                printk ("]  dcr(%s)=[", i ? "soft" : "hard");
                dcr = i ? priv->ctr : inb (CONTROL (p));
        
                if (dcr & 0x20) {
                        printk ("rev");
                } else {
                        printk ("fwd");
                }
                if (dcr & 0x10) printk (",ackIntEn");
                if (!(dcr & 0x08)) printk (",N-SELECT-IN");
                if (dcr & 0x04) printk (",N-INIT");
                if (!(dcr & 0x02)) printk (",N-AUTOFD");
                if (!(dcr & 0x01)) printk (",N-STROBE");
        }
        printk ("]  dsr=[");
        if (!(dsr & 0x80)) printk ("BUSY");
        if (dsr & 0x40) printk (",N-ACK");
        if (dsr & 0x20) printk (",PERROR");
        if (dsr & 0x10) printk (",SELECT");
        if (dsr & 0x08) printk (",N-FAULT");
        printk ("]\n");
        return;
}
#else   /* !DEBUG_PARPORT */
#define dump_parport_state(args...)
#endif  /* !DEBUG_PARPORT */

/* __parport_pc_frob_control differs from parport_pc_frob_control in that
 * it doesn't do any extra masking. */
static __inline__ unsigned char __parport_pc_frob_control (struct parport *p,
                                                           unsigned char mask,
                                                           unsigned char val)
{
        struct parport_pc_private *priv = p->physport->private_data;
        unsigned char ctr = priv->ctr;
#ifdef DEBUG_PARPORT
        printk (KERN_DEBUG
                "__parport_pc_frob_control(%02x,%02x): %02x -> %02x\n",
                mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
#endif
        ctr = (ctr & ~mask) ^ val;
        ctr &= priv->ctr_writable; /* only write writable bits. */
        outb (ctr, CONTROL (p));
        priv->ctr = ctr;        /* Update soft copy */
        return ctr;
}

static __inline__ void parport_pc_data_reverse (struct parport *p)
{
        __parport_pc_frob_control (p, 0x20, 0x20);
}

static __inline__ void parport_pc_data_forward (struct parport *p)
{
        __parport_pc_frob_control (p, 0x20, 0x00);
}

static __inline__ void parport_pc_write_control (struct parport *p,
                                                 unsigned char d)
{
        const unsigned char wm = (PARPORT_CONTROL_STROBE |
                                  PARPORT_CONTROL_AUTOFD |
                                  PARPORT_CONTROL_INIT |
                                  PARPORT_CONTROL_SELECT);

        /* Take this out when drivers have adapted to newer interface. */
        if (d & 0x20) {
                printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
                        p->name, p->cad->name);
                parport_pc_data_reverse (p);
        }

        __parport_pc_frob_control (p, wm, d & wm);
}

static __inline__ unsigned char parport_pc_read_control(struct parport *p)
{
        const unsigned char rm = (PARPORT_CONTROL_STROBE |
                                  PARPORT_CONTROL_AUTOFD |
                                  PARPORT_CONTROL_INIT |
                                  PARPORT_CONTROL_SELECT);
        const struct parport_pc_private *priv = p->physport->private_data;
        return priv->ctr & rm; /* Use soft copy */
}

static __inline__ unsigned char parport_pc_frob_control (struct parport *p,
                                                         unsigned char mask,
                                                         unsigned char val)
{
        const unsigned char wm = (PARPORT_CONTROL_STROBE |
                                  PARPORT_CONTROL_AUTOFD |
                                  PARPORT_CONTROL_INIT |
                                  PARPORT_CONTROL_SELECT);

        /* Take this out when drivers have adapted to newer interface. */
        if (mask & 0x20) {
                printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
                        p->name, p->cad->name,
                        (val & 0x20) ? "reverse" : "forward");
                if (val & 0x20)
                        parport_pc_data_reverse (p);
                else
                        parport_pc_data_forward (p);
        }

        /* Restrict mask and val to control lines. */
        mask &= wm;
        val &= wm;

        return __parport_pc_frob_control (p, mask, val);
}

static __inline__ unsigned char parport_pc_read_status(struct parport *p)
{
        return inb(STATUS(p));
}


static __inline__ void parport_pc_disable_irq(struct parport *p)
{
        __parport_pc_frob_control (p, 0x10, 0x00);
}

static __inline__ void parport_pc_enable_irq(struct parport *p)
{
        __parport_pc_frob_control (p, 0x10, 0x10);
}

extern void parport_pc_release_resources(struct parport *p);

extern int parport_pc_claim_resources(struct parport *p);

/* PCMCIA code will want to get us to look at a port.  Provide a mechanism. */
extern struct parport *parport_pc_probe_port(unsigned long base,
                                             unsigned long base_hi,
                                             int irq, int dma,
                                             struct device *dev,
                                             int irqflags);
extern void parport_pc_unregister_port(struct parport *p);

#endif
/* [<][>][^][v][top][bottom][index][help] */
root/include/linux/parport_pc.h

INCLUDED FROM

DEFINITIONS
