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62 |
marcus.erl |
/* IEEE-1284 operations for parport.
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*
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* This file is for generic IEEE 1284 operations. The idea is that
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* they are used by the low-level drivers. If they have a special way
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* of doing something, they can provide their own routines (and put
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* the function pointers in port->ops); if not, they can just use these
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* as a fallback.
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*
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* Note: Make no assumptions about hardware or architecture in this file!
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*
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* Author: Tim Waugh <tim@cyberelk.demon.co.uk>
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* Fixed AUTOFD polarity in ecp_forward_to_reverse(). Fred Barnes, 1999
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* Software emulated EPP fixes, Fred Barnes, 04/2001.
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*/
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#include <linux/module.h>
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#include <linux/parport.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <asm/uaccess.h>
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#undef DEBUG /* undef me for production */
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#ifdef CONFIG_LP_CONSOLE
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#undef DEBUG /* Don't want a garbled console */
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#endif
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#ifdef DEBUG
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#define DPRINTK(stuff...) printk (stuff)
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#else
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#define DPRINTK(stuff...)
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#endif
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/*** *
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* One-way data transfer functions. *
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* ***/
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/* Compatibility mode. */
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size_t parport_ieee1284_write_compat (struct parport *port,
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const void *buffer, size_t len,
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| 42 |
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int flags)
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{
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int no_irq = 1;
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ssize_t count = 0;
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const unsigned char *addr = buffer;
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unsigned char byte;
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struct pardevice *dev = port->physport->cad;
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unsigned char ctl = (PARPORT_CONTROL_SELECT
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| PARPORT_CONTROL_INIT);
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| 51 |
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| 52 |
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if (port->irq != PARPORT_IRQ_NONE) {
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parport_enable_irq (port);
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no_irq = 0;
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}
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port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
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parport_write_control (port, ctl);
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parport_data_forward (port);
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while (count < len) {
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unsigned long expire = jiffies + dev->timeout;
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| 62 |
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long wait = msecs_to_jiffies(10);
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unsigned char mask = (PARPORT_STATUS_ERROR
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| PARPORT_STATUS_BUSY);
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| 65 |
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unsigned char val = (PARPORT_STATUS_ERROR
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| PARPORT_STATUS_BUSY);
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| 67 |
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| 68 |
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/* Wait until the peripheral's ready */
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| 69 |
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do {
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/* Is the peripheral ready yet? */
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if (!parport_wait_peripheral (port, mask, val))
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/* Skip the loop */
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goto ready;
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| 75 |
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/* Is the peripheral upset? */
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if ((parport_read_status (port) &
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(PARPORT_STATUS_PAPEROUT |
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PARPORT_STATUS_SELECT |
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PARPORT_STATUS_ERROR))
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!= (PARPORT_STATUS_SELECT |
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PARPORT_STATUS_ERROR))
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/* If nFault is asserted (i.e. no
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* error) and PAPEROUT and SELECT are
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* just red herrings, give the driver
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* a chance to check it's happy with
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* that before continuing. */
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| 87 |
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goto stop;
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| 89 |
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/* Have we run out of time? */
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| 90 |
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if (!time_before (jiffies, expire))
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break;
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| 93 |
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/* Yield the port for a while. If this is the
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first time around the loop, don't let go of
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the port. This way, we find out if we have
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our interrupt handler called. */
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| 97 |
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if (count && no_irq) {
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| 98 |
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parport_release (dev);
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schedule_timeout_interruptible(wait);
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parport_claim_or_block (dev);
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}
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| 102 |
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else
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| 103 |
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/* We must have the device claimed here */
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parport_wait_event (port, wait);
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| 106 |
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/* Is there a signal pending? */
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if (signal_pending (current))
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break;
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| 110 |
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/* Wait longer next time. */
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wait *= 2;
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} while (time_before (jiffies, expire));
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| 113 |
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| 114 |
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if (signal_pending (current))
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break;
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| 116 |
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| 117 |
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DPRINTK (KERN_DEBUG "%s: Timed out\n", port->name);
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break;
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| 120 |
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ready:
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/* Write the character to the data lines. */
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byte = *addr++;
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parport_write_data (port, byte);
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udelay (1);
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| 126 |
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/* Pulse strobe. */
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parport_write_control (port, ctl | PARPORT_CONTROL_STROBE);
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udelay (1); /* strobe */
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parport_write_control (port, ctl);
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udelay (1); /* hold */
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/* Assume the peripheral received it. */
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count++;
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| 135 |
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| 136 |
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/* Let another process run if it needs to. */
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if (time_before (jiffies, expire))
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if (!parport_yield_blocking (dev)
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&& need_resched())
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schedule ();
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}
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stop:
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port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
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| 145 |
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return count;
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| 146 |
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}
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| 147 |
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| 148 |
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/* Nibble mode. */
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size_t parport_ieee1284_read_nibble (struct parport *port,
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void *buffer, size_t len,
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| 151 |
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int flags)
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{
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#ifndef CONFIG_PARPORT_1284
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return 0;
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#else
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| 156 |
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unsigned char *buf = buffer;
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| 157 |
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int i;
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| 158 |
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unsigned char byte = 0;
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| 159 |
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| 160 |
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len *= 2; /* in nibbles */
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| 161 |
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for (i=0; i < len; i++) {
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| 162 |
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unsigned char nibble;
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| 163 |
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| 164 |
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/* Does the error line indicate end of data? */
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if (((i & 1) == 0) &&
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(parport_read_status(port) & PARPORT_STATUS_ERROR)) {
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goto end_of_data;
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| 168 |
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}
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| 169 |
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| 170 |
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/* Event 7: Set nAutoFd low. */
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| 171 |
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parport_frob_control (port,
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PARPORT_CONTROL_AUTOFD,
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PARPORT_CONTROL_AUTOFD);
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| 174 |
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| 175 |
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/* Event 9: nAck goes low. */
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| 176 |
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port->ieee1284.phase = IEEE1284_PH_REV_DATA;
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| 177 |
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if (parport_wait_peripheral (port,
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| 178 |
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PARPORT_STATUS_ACK, 0)) {
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| 179 |
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/* Timeout -- no more data? */
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| 180 |
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DPRINTK (KERN_DEBUG
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"%s: Nibble timeout at event 9 (%d bytes)\n",
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port->name, i/2);
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parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
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break;
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| 185 |
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}
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| 186 |
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| 187 |
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| 188 |
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/* Read a nibble. */
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nibble = parport_read_status (port) >> 3;
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nibble &= ~8;
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if ((nibble & 0x10) == 0)
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nibble |= 8;
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nibble &= 0xf;
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| 194 |
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| 195 |
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/* Event 10: Set nAutoFd high. */
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| 196 |
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parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
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| 198 |
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/* Event 11: nAck goes high. */
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| 199 |
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if (parport_wait_peripheral (port,
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PARPORT_STATUS_ACK,
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| 201 |
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PARPORT_STATUS_ACK)) {
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| 202 |
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/* Timeout -- no more data? */
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| 203 |
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DPRINTK (KERN_DEBUG
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| 204 |
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"%s: Nibble timeout at event 11\n",
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| 205 |
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port->name);
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| 206 |
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break;
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| 207 |
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}
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| 208 |
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| 209 |
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if (i & 1) {
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| 210 |
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/* Second nibble */
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| 211 |
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byte |= nibble << 4;
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| 212 |
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*buf++ = byte;
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| 213 |
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} else
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| 214 |
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byte = nibble;
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| 215 |
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}
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| 216 |
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| 217 |
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if (i == len) {
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| 218 |
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/* Read the last nibble without checking data avail. */
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| 219 |
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if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
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| 220 |
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end_of_data:
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| 221 |
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DPRINTK (KERN_DEBUG
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| 222 |
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"%s: No more nibble data (%d bytes)\n",
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| 223 |
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port->name, i/2);
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| 224 |
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| 225 |
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/* Go to reverse idle phase. */
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| 226 |
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parport_frob_control (port,
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| 227 |
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PARPORT_CONTROL_AUTOFD,
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| 228 |
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PARPORT_CONTROL_AUTOFD);
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| 229 |
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port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
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| 230 |
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}
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| 231 |
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else
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| 232 |
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port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
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| 233 |
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}
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| 234 |
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| 235 |
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return i/2;
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| 236 |
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#endif /* IEEE1284 support */
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| 237 |
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}
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| 238 |
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| 239 |
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/* Byte mode. */
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| 240 |
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size_t parport_ieee1284_read_byte (struct parport *port,
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| 241 |
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void *buffer, size_t len,
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| 242 |
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int flags)
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| 243 |
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{
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| 244 |
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#ifndef CONFIG_PARPORT_1284
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| 245 |
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return 0;
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| 246 |
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#else
|
| 247 |
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unsigned char *buf = buffer;
|
| 248 |
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ssize_t count = 0;
|
| 249 |
|
|
|
| 250 |
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for (count = 0; count < len; count++) {
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| 251 |
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unsigned char byte;
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| 252 |
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| 253 |
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/* Data available? */
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| 254 |
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if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
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| 255 |
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goto end_of_data;
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| 256 |
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}
|
| 257 |
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| 258 |
|
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/* Event 14: Place data bus in high impedance state. */
|
| 259 |
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parport_data_reverse (port);
|
| 260 |
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| 261 |
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/* Event 7: Set nAutoFd low. */
|
| 262 |
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parport_frob_control (port,
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| 263 |
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PARPORT_CONTROL_AUTOFD,
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| 264 |
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PARPORT_CONTROL_AUTOFD);
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| 265 |
|
|
|
| 266 |
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/* Event 9: nAck goes low. */
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| 267 |
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port->physport->ieee1284.phase = IEEE1284_PH_REV_DATA;
|
| 268 |
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if (parport_wait_peripheral (port,
|
| 269 |
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PARPORT_STATUS_ACK,
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| 270 |
|
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0)) {
|
| 271 |
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/* Timeout -- no more data? */
|
| 272 |
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parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
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| 273 |
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0);
|
| 274 |
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DPRINTK (KERN_DEBUG "%s: Byte timeout at event 9\n",
|
| 275 |
|
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port->name);
|
| 276 |
|
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break;
|
| 277 |
|
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}
|
| 278 |
|
|
|
| 279 |
|
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byte = parport_read_data (port);
|
| 280 |
|
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*buf++ = byte;
|
| 281 |
|
|
|
| 282 |
|
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/* Event 10: Set nAutoFd high */
|
| 283 |
|
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parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
|
| 284 |
|
|
|
| 285 |
|
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/* Event 11: nAck goes high. */
|
| 286 |
|
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if (parport_wait_peripheral (port,
|
| 287 |
|
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PARPORT_STATUS_ACK,
|
| 288 |
|
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PARPORT_STATUS_ACK)) {
|
| 289 |
|
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/* Timeout -- no more data? */
|
| 290 |
|
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DPRINTK (KERN_DEBUG "%s: Byte timeout at event 11\n",
|
| 291 |
|
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port->name);
|
| 292 |
|
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break;
|
| 293 |
|
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}
|
| 294 |
|
|
|
| 295 |
|
|
/* Event 16: Set nStrobe low. */
|
| 296 |
|
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parport_frob_control (port,
|
| 297 |
|
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PARPORT_CONTROL_STROBE,
|
| 298 |
|
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PARPORT_CONTROL_STROBE);
|
| 299 |
|
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udelay (5);
|
| 300 |
|
|
|
| 301 |
|
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/* Event 17: Set nStrobe high. */
|
| 302 |
|
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parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
|
| 303 |
|
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}
|
| 304 |
|
|
|
| 305 |
|
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if (count == len) {
|
| 306 |
|
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/* Read the last byte without checking data avail. */
|
| 307 |
|
|
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
|
| 308 |
|
|
end_of_data:
|
| 309 |
|
|
DPRINTK (KERN_DEBUG
|
| 310 |
|
|
"%s: No more byte data (%Zd bytes)\n",
|
| 311 |
|
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port->name, count);
|
| 312 |
|
|
|
| 313 |
|
|
/* Go to reverse idle phase. */
|
| 314 |
|
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parport_frob_control (port,
|
| 315 |
|
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PARPORT_CONTROL_AUTOFD,
|
| 316 |
|
|
PARPORT_CONTROL_AUTOFD);
|
| 317 |
|
|
port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
|
| 318 |
|
|
}
|
| 319 |
|
|
else
|
| 320 |
|
|
port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
|
| 321 |
|
|
}
|
| 322 |
|
|
|
| 323 |
|
|
return count;
|
| 324 |
|
|
#endif /* IEEE1284 support */
|
| 325 |
|
|
}
|
| 326 |
|
|
|
| 327 |
|
|
/*** *
|
| 328 |
|
|
* ECP Functions. *
|
| 329 |
|
|
* ***/
|
| 330 |
|
|
|
| 331 |
|
|
#ifdef CONFIG_PARPORT_1284
|
| 332 |
|
|
|
| 333 |
|
|
static inline
|
| 334 |
|
|
int ecp_forward_to_reverse (struct parport *port)
|
| 335 |
|
|
{
|
| 336 |
|
|
int retval;
|
| 337 |
|
|
|
| 338 |
|
|
/* Event 38: Set nAutoFd low */
|
| 339 |
|
|
parport_frob_control (port,
|
| 340 |
|
|
PARPORT_CONTROL_AUTOFD,
|
| 341 |
|
|
PARPORT_CONTROL_AUTOFD);
|
| 342 |
|
|
parport_data_reverse (port);
|
| 343 |
|
|
udelay (5);
|
| 344 |
|
|
|
| 345 |
|
|
/* Event 39: Set nInit low to initiate bus reversal */
|
| 346 |
|
|
parport_frob_control (port,
|
| 347 |
|
|
PARPORT_CONTROL_INIT,
|
| 348 |
|
|
0);
|
| 349 |
|
|
|
| 350 |
|
|
/* Event 40: PError goes low */
|
| 351 |
|
|
retval = parport_wait_peripheral (port,
|
| 352 |
|
|
PARPORT_STATUS_PAPEROUT, 0);
|
| 353 |
|
|
|
| 354 |
|
|
if (!retval) {
|
| 355 |
|
|
DPRINTK (KERN_DEBUG "%s: ECP direction: reverse\n",
|
| 356 |
|
|
port->name);
|
| 357 |
|
|
port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
|
| 358 |
|
|
} else {
|
| 359 |
|
|
DPRINTK (KERN_DEBUG "%s: ECP direction: failed to reverse\n",
|
| 360 |
|
|
port->name);
|
| 361 |
|
|
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
|
| 362 |
|
|
}
|
| 363 |
|
|
|
| 364 |
|
|
return retval;
|
| 365 |
|
|
}
|
| 366 |
|
|
|
| 367 |
|
|
static inline
|
| 368 |
|
|
int ecp_reverse_to_forward (struct parport *port)
|
| 369 |
|
|
{
|
| 370 |
|
|
int retval;
|
| 371 |
|
|
|
| 372 |
|
|
/* Event 47: Set nInit high */
|
| 373 |
|
|
parport_frob_control (port,
|
| 374 |
|
|
PARPORT_CONTROL_INIT
|
| 375 |
|
|
| PARPORT_CONTROL_AUTOFD,
|
| 376 |
|
|
PARPORT_CONTROL_INIT
|
| 377 |
|
|
| PARPORT_CONTROL_AUTOFD);
|
| 378 |
|
|
|
| 379 |
|
|
/* Event 49: PError goes high */
|
| 380 |
|
|
retval = parport_wait_peripheral (port,
|
| 381 |
|
|
PARPORT_STATUS_PAPEROUT,
|
| 382 |
|
|
PARPORT_STATUS_PAPEROUT);
|
| 383 |
|
|
|
| 384 |
|
|
if (!retval) {
|
| 385 |
|
|
parport_data_forward (port);
|
| 386 |
|
|
DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n",
|
| 387 |
|
|
port->name);
|
| 388 |
|
|
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
|
| 389 |
|
|
} else {
|
| 390 |
|
|
DPRINTK (KERN_DEBUG
|
| 391 |
|
|
"%s: ECP direction: failed to switch forward\n",
|
| 392 |
|
|
port->name);
|
| 393 |
|
|
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
|
| 394 |
|
|
}
|
| 395 |
|
|
|
| 396 |
|
|
|
| 397 |
|
|
return retval;
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
#endif /* IEEE1284 support */
|
| 401 |
|
|
|
| 402 |
|
|
/* ECP mode, forward channel, data. */
|
| 403 |
|
|
size_t parport_ieee1284_ecp_write_data (struct parport *port,
|
| 404 |
|
|
const void *buffer, size_t len,
|
| 405 |
|
|
int flags)
|
| 406 |
|
|
{
|
| 407 |
|
|
#ifndef CONFIG_PARPORT_1284
|
| 408 |
|
|
return 0;
|
| 409 |
|
|
#else
|
| 410 |
|
|
const unsigned char *buf = buffer;
|
| 411 |
|
|
size_t written;
|
| 412 |
|
|
int retry;
|
| 413 |
|
|
|
| 414 |
|
|
port = port->physport;
|
| 415 |
|
|
|
| 416 |
|
|
if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
|
| 417 |
|
|
if (ecp_reverse_to_forward (port))
|
| 418 |
|
|
return 0;
|
| 419 |
|
|
|
| 420 |
|
|
port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
|
| 421 |
|
|
|
| 422 |
|
|
/* HostAck high (data, not command) */
|
| 423 |
|
|
parport_frob_control (port,
|
| 424 |
|
|
PARPORT_CONTROL_AUTOFD
|
| 425 |
|
|
| PARPORT_CONTROL_STROBE
|
| 426 |
|
|
| PARPORT_CONTROL_INIT,
|
| 427 |
|
|
PARPORT_CONTROL_INIT);
|
| 428 |
|
|
for (written = 0; written < len; written++, buf++) {
|
| 429 |
|
|
unsigned long expire = jiffies + port->cad->timeout;
|
| 430 |
|
|
unsigned char byte;
|
| 431 |
|
|
|
| 432 |
|
|
byte = *buf;
|
| 433 |
|
|
try_again:
|
| 434 |
|
|
parport_write_data (port, byte);
|
| 435 |
|
|
parport_frob_control (port, PARPORT_CONTROL_STROBE,
|
| 436 |
|
|
PARPORT_CONTROL_STROBE);
|
| 437 |
|
|
udelay (5);
|
| 438 |
|
|
for (retry = 0; retry < 100; retry++) {
|
| 439 |
|
|
if (!parport_wait_peripheral (port,
|
| 440 |
|
|
PARPORT_STATUS_BUSY, 0))
|
| 441 |
|
|
goto success;
|
| 442 |
|
|
|
| 443 |
|
|
if (signal_pending (current)) {
|
| 444 |
|
|
parport_frob_control (port,
|
| 445 |
|
|
PARPORT_CONTROL_STROBE,
|
| 446 |
|
|
0);
|
| 447 |
|
|
break;
|
| 448 |
|
|
}
|
| 449 |
|
|
}
|
| 450 |
|
|
|
| 451 |
|
|
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
|
| 452 |
|
|
DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
|
| 453 |
|
|
|
| 454 |
|
|
parport_frob_control (port, PARPORT_CONTROL_INIT,
|
| 455 |
|
|
PARPORT_CONTROL_INIT);
|
| 456 |
|
|
udelay (50);
|
| 457 |
|
|
if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
|
| 458 |
|
|
/* It's buggered. */
|
| 459 |
|
|
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
|
| 460 |
|
|
break;
|
| 461 |
|
|
}
|
| 462 |
|
|
|
| 463 |
|
|
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
|
| 464 |
|
|
udelay (50);
|
| 465 |
|
|
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
|
| 466 |
|
|
break;
|
| 467 |
|
|
|
| 468 |
|
|
DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
|
| 469 |
|
|
port->name);
|
| 470 |
|
|
|
| 471 |
|
|
if (time_after_eq (jiffies, expire)) break;
|
| 472 |
|
|
goto try_again;
|
| 473 |
|
|
success:
|
| 474 |
|
|
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
|
| 475 |
|
|
udelay (5);
|
| 476 |
|
|
if (parport_wait_peripheral (port,
|
| 477 |
|
|
PARPORT_STATUS_BUSY,
|
| 478 |
|
|
PARPORT_STATUS_BUSY))
|
| 479 |
|
|
/* Peripheral hasn't accepted the data. */
|
| 480 |
|
|
break;
|
| 481 |
|
|
}
|
| 482 |
|
|
|
| 483 |
|
|
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
|
| 484 |
|
|
|
| 485 |
|
|
return written;
|
| 486 |
|
|
#endif /* IEEE1284 support */
|
| 487 |
|
|
}
|
| 488 |
|
|
|
| 489 |
|
|
/* ECP mode, reverse channel, data. */
|
| 490 |
|
|
size_t parport_ieee1284_ecp_read_data (struct parport *port,
|
| 491 |
|
|
void *buffer, size_t len, int flags)
|
| 492 |
|
|
{
|
| 493 |
|
|
#ifndef CONFIG_PARPORT_1284
|
| 494 |
|
|
return 0;
|
| 495 |
|
|
#else
|
| 496 |
|
|
struct pardevice *dev = port->cad;
|
| 497 |
|
|
unsigned char *buf = buffer;
|
| 498 |
|
|
int rle_count = 0; /* shut gcc up */
|
| 499 |
|
|
unsigned char ctl;
|
| 500 |
|
|
int rle = 0;
|
| 501 |
|
|
ssize_t count = 0;
|
| 502 |
|
|
|
| 503 |
|
|
port = port->physport;
|
| 504 |
|
|
|
| 505 |
|
|
if (port->ieee1284.phase != IEEE1284_PH_REV_IDLE)
|
| 506 |
|
|
if (ecp_forward_to_reverse (port))
|
| 507 |
|
|
return 0;
|
| 508 |
|
|
|
| 509 |
|
|
port->ieee1284.phase = IEEE1284_PH_REV_DATA;
|
| 510 |
|
|
|
| 511 |
|
|
/* Set HostAck low to start accepting data. */
|
| 512 |
|
|
ctl = parport_read_control (port);
|
| 513 |
|
|
ctl &= ~(PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT |
|
| 514 |
|
|
PARPORT_CONTROL_AUTOFD);
|
| 515 |
|
|
parport_write_control (port,
|
| 516 |
|
|
ctl | PARPORT_CONTROL_AUTOFD);
|
| 517 |
|
|
while (count < len) {
|
| 518 |
|
|
unsigned long expire = jiffies + dev->timeout;
|
| 519 |
|
|
unsigned char byte;
|
| 520 |
|
|
int command;
|
| 521 |
|
|
|
| 522 |
|
|
/* Event 43: Peripheral sets nAck low. It can take as
|
| 523 |
|
|
long as it wants. */
|
| 524 |
|
|
while (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) {
|
| 525 |
|
|
/* The peripheral hasn't given us data in
|
| 526 |
|
|
35ms. If we have data to give back to the
|
| 527 |
|
|
caller, do it now. */
|
| 528 |
|
|
if (count)
|
| 529 |
|
|
goto out;
|
| 530 |
|
|
|
| 531 |
|
|
/* If we've used up all the time we were allowed,
|
| 532 |
|
|
give up altogether. */
|
| 533 |
|
|
if (!time_before (jiffies, expire))
|
| 534 |
|
|
goto out;
|
| 535 |
|
|
|
| 536 |
|
|
/* Yield the port for a while. */
|
| 537 |
|
|
if (count && dev->port->irq != PARPORT_IRQ_NONE) {
|
| 538 |
|
|
parport_release (dev);
|
| 539 |
|
|
schedule_timeout_interruptible(msecs_to_jiffies(40));
|
| 540 |
|
|
parport_claim_or_block (dev);
|
| 541 |
|
|
}
|
| 542 |
|
|
else
|
| 543 |
|
|
/* We must have the device claimed here. */
|
| 544 |
|
|
parport_wait_event (port, msecs_to_jiffies(40));
|
| 545 |
|
|
|
| 546 |
|
|
/* Is there a signal pending? */
|
| 547 |
|
|
if (signal_pending (current))
|
| 548 |
|
|
goto out;
|
| 549 |
|
|
}
|
| 550 |
|
|
|
| 551 |
|
|
/* Is this a command? */
|
| 552 |
|
|
if (rle)
|
| 553 |
|
|
/* The last byte was a run-length count, so
|
| 554 |
|
|
this can't be as well. */
|
| 555 |
|
|
command = 0;
|
| 556 |
|
|
else
|
| 557 |
|
|
command = (parport_read_status (port) &
|
| 558 |
|
|
PARPORT_STATUS_BUSY) ? 1 : 0;
|
| 559 |
|
|
|
| 560 |
|
|
/* Read the data. */
|
| 561 |
|
|
byte = parport_read_data (port);
|
| 562 |
|
|
|
| 563 |
|
|
/* If this is a channel command, rather than an RLE
|
| 564 |
|
|
command or a normal data byte, don't accept it. */
|
| 565 |
|
|
if (command) {
|
| 566 |
|
|
if (byte & 0x80) {
|
| 567 |
|
|
DPRINTK (KERN_DEBUG "%s: stopping short at "
|
| 568 |
|
|
"channel command (%02x)\n",
|
| 569 |
|
|
port->name, byte);
|
| 570 |
|
|
goto out;
|
| 571 |
|
|
}
|
| 572 |
|
|
else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE)
|
| 573 |
|
|
DPRINTK (KERN_DEBUG "%s: device illegally "
|
| 574 |
|
|
"using RLE; accepting anyway\n",
|
| 575 |
|
|
port->name);
|
| 576 |
|
|
|
| 577 |
|
|
rle_count = byte + 1;
|
| 578 |
|
|
|
| 579 |
|
|
/* Are we allowed to read that many bytes? */
|
| 580 |
|
|
if (rle_count > (len - count)) {
|
| 581 |
|
|
DPRINTK (KERN_DEBUG "%s: leaving %d RLE bytes "
|
| 582 |
|
|
"for next time\n", port->name,
|
| 583 |
|
|
rle_count);
|
| 584 |
|
|
break;
|
| 585 |
|
|
}
|
| 586 |
|
|
|
| 587 |
|
|
rle = 1;
|
| 588 |
|
|
}
|
| 589 |
|
|
|
| 590 |
|
|
/* Event 44: Set HostAck high, acknowledging handshake. */
|
| 591 |
|
|
parport_write_control (port, ctl);
|
| 592 |
|
|
|
| 593 |
|
|
/* Event 45: The peripheral has 35ms to set nAck high. */
|
| 594 |
|
|
if (parport_wait_peripheral (port, PARPORT_STATUS_ACK,
|
| 595 |
|
|
PARPORT_STATUS_ACK)) {
|
| 596 |
|
|
/* It's gone wrong. Return what data we have
|
| 597 |
|
|
to the caller. */
|
| 598 |
|
|
DPRINTK (KERN_DEBUG "ECP read timed out at 45\n");
|
| 599 |
|
|
|
| 600 |
|
|
if (command)
|
| 601 |
|
|
printk (KERN_WARNING
|
| 602 |
|
|
"%s: command ignored (%02x)\n",
|
| 603 |
|
|
port->name, byte);
|
| 604 |
|
|
|
| 605 |
|
|
break;
|
| 606 |
|
|
}
|
| 607 |
|
|
|
| 608 |
|
|
/* Event 46: Set HostAck low and accept the data. */
|
| 609 |
|
|
parport_write_control (port,
|
| 610 |
|
|
ctl | PARPORT_CONTROL_AUTOFD);
|
| 611 |
|
|
|
| 612 |
|
|
/* If we just read a run-length count, fetch the data. */
|
| 613 |
|
|
if (command)
|
| 614 |
|
|
continue;
|
| 615 |
|
|
|
| 616 |
|
|
/* If this is the byte after a run-length count, decompress. */
|
| 617 |
|
|
if (rle) {
|
| 618 |
|
|
rle = 0;
|
| 619 |
|
|
memset (buf, byte, rle_count);
|
| 620 |
|
|
buf += rle_count;
|
| 621 |
|
|
count += rle_count;
|
| 622 |
|
|
DPRINTK (KERN_DEBUG "%s: decompressed to %d bytes\n",
|
| 623 |
|
|
port->name, rle_count);
|
| 624 |
|
|
} else {
|
| 625 |
|
|
/* Normal data byte. */
|
| 626 |
|
|
*buf = byte;
|
| 627 |
|
|
buf++, count++;
|
| 628 |
|
|
}
|
| 629 |
|
|
}
|
| 630 |
|
|
|
| 631 |
|
|
out:
|
| 632 |
|
|
port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
|
| 633 |
|
|
return count;
|
| 634 |
|
|
#endif /* IEEE1284 support */
|
| 635 |
|
|
}
|
| 636 |
|
|
|
| 637 |
|
|
/* ECP mode, forward channel, commands. */
|
| 638 |
|
|
size_t parport_ieee1284_ecp_write_addr (struct parport *port,
|
| 639 |
|
|
const void *buffer, size_t len,
|
| 640 |
|
|
int flags)
|
| 641 |
|
|
{
|
| 642 |
|
|
#ifndef CONFIG_PARPORT_1284
|
| 643 |
|
|
return 0;
|
| 644 |
|
|
#else
|
| 645 |
|
|
const unsigned char *buf = buffer;
|
| 646 |
|
|
size_t written;
|
| 647 |
|
|
int retry;
|
| 648 |
|
|
|
| 649 |
|
|
port = port->physport;
|
| 650 |
|
|
|
| 651 |
|
|
if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
|
| 652 |
|
|
if (ecp_reverse_to_forward (port))
|
| 653 |
|
|
return 0;
|
| 654 |
|
|
|
| 655 |
|
|
port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
|
| 656 |
|
|
|
| 657 |
|
|
/* HostAck low (command, not data) */
|
| 658 |
|
|
parport_frob_control (port,
|
| 659 |
|
|
PARPORT_CONTROL_AUTOFD
|
| 660 |
|
|
| PARPORT_CONTROL_STROBE
|
| 661 |
|
|
| PARPORT_CONTROL_INIT,
|
| 662 |
|
|
PARPORT_CONTROL_AUTOFD
|
| 663 |
|
|
| PARPORT_CONTROL_INIT);
|
| 664 |
|
|
for (written = 0; written < len; written++, buf++) {
|
| 665 |
|
|
unsigned long expire = jiffies + port->cad->timeout;
|
| 666 |
|
|
unsigned char byte;
|
| 667 |
|
|
|
| 668 |
|
|
byte = *buf;
|
| 669 |
|
|
try_again:
|
| 670 |
|
|
parport_write_data (port, byte);
|
| 671 |
|
|
parport_frob_control (port, PARPORT_CONTROL_STROBE,
|
| 672 |
|
|
PARPORT_CONTROL_STROBE);
|
| 673 |
|
|
udelay (5);
|
| 674 |
|
|
for (retry = 0; retry < 100; retry++) {
|
| 675 |
|
|
if (!parport_wait_peripheral (port,
|
| 676 |
|
|
PARPORT_STATUS_BUSY, 0))
|
| 677 |
|
|
goto success;
|
| 678 |
|
|
|
| 679 |
|
|
if (signal_pending (current)) {
|
| 680 |
|
|
parport_frob_control (port,
|
| 681 |
|
|
PARPORT_CONTROL_STROBE,
|
| 682 |
|
|
0);
|
| 683 |
|
|
break;
|
| 684 |
|
|
}
|
| 685 |
|
|
}
|
| 686 |
|
|
|
| 687 |
|
|
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
|
| 688 |
|
|
DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
|
| 689 |
|
|
|
| 690 |
|
|
parport_frob_control (port, PARPORT_CONTROL_INIT,
|
| 691 |
|
|
PARPORT_CONTROL_INIT);
|
| 692 |
|
|
udelay (50);
|
| 693 |
|
|
if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
|
| 694 |
|
|
/* It's buggered. */
|
| 695 |
|
|
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
|
| 696 |
|
|
break;
|
| 697 |
|
|
}
|
| 698 |
|
|
|
| 699 |
|
|
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
|
| 700 |
|
|
udelay (50);
|
| 701 |
|
|
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
|
| 702 |
|
|
break;
|
| 703 |
|
|
|
| 704 |
|
|
DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
|
| 705 |
|
|
port->name);
|
| 706 |
|
|
|
| 707 |
|
|
if (time_after_eq (jiffies, expire)) break;
|
| 708 |
|
|
goto try_again;
|
| 709 |
|
|
success:
|
| 710 |
|
|
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
|
| 711 |
|
|
udelay (5);
|
| 712 |
|
|
if (parport_wait_peripheral (port,
|
| 713 |
|
|
PARPORT_STATUS_BUSY,
|
| 714 |
|
|
PARPORT_STATUS_BUSY))
|
| 715 |
|
|
/* Peripheral hasn't accepted the data. */
|
| 716 |
|
|
break;
|
| 717 |
|
|
}
|
| 718 |
|
|
|
| 719 |
|
|
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
|
| 720 |
|
|
|
| 721 |
|
|
return written;
|
| 722 |
|
|
#endif /* IEEE1284 support */
|
| 723 |
|
|
}
|
| 724 |
|
|
|
| 725 |
|
|
/*** *
|
| 726 |
|
|
* EPP functions. *
|
| 727 |
|
|
* ***/
|
| 728 |
|
|
|
| 729 |
|
|
/* EPP mode, forward channel, data. */
|
| 730 |
|
|
size_t parport_ieee1284_epp_write_data (struct parport *port,
|
| 731 |
|
|
const void *buffer, size_t len,
|
| 732 |
|
|
int flags)
|
| 733 |
|
|
{
|
| 734 |
|
|
unsigned char *bp = (unsigned char *) buffer;
|
| 735 |
|
|
size_t ret = 0;
|
| 736 |
|
|
|
| 737 |
|
|
/* set EPP idle state (just to make sure) with strobe low */
|
| 738 |
|
|
parport_frob_control (port,
|
| 739 |
|
|
PARPORT_CONTROL_STROBE |
|
| 740 |
|
|
PARPORT_CONTROL_AUTOFD |
|
| 741 |
|
|
PARPORT_CONTROL_SELECT |
|
| 742 |
|
|
PARPORT_CONTROL_INIT,
|
| 743 |
|
|
PARPORT_CONTROL_STROBE |
|
| 744 |
|
|
PARPORT_CONTROL_INIT);
|
| 745 |
|
|
port->ops->data_forward (port);
|
| 746 |
|
|
for (; len > 0; len--, bp++) {
|
| 747 |
|
|
/* Event 62: Write data and set autofd low */
|
| 748 |
|
|
parport_write_data (port, *bp);
|
| 749 |
|
|
parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
|
| 750 |
|
|
PARPORT_CONTROL_AUTOFD);
|
| 751 |
|
|
|
| 752 |
|
|
/* Event 58: wait for busy (nWait) to go high */
|
| 753 |
|
|
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10))
|
| 754 |
|
|
break;
|
| 755 |
|
|
|
| 756 |
|
|
/* Event 63: set nAutoFd (nDStrb) high */
|
| 757 |
|
|
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
|
| 758 |
|
|
|
| 759 |
|
|
/* Event 60: wait for busy (nWait) to go low */
|
| 760 |
|
|
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
|
| 761 |
|
|
PARPORT_STATUS_BUSY, 5))
|
| 762 |
|
|
break;
|
| 763 |
|
|
|
| 764 |
|
|
ret++;
|
| 765 |
|
|
}
|
| 766 |
|
|
|
| 767 |
|
|
/* Event 61: set strobe (nWrite) high */
|
| 768 |
|
|
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
|
| 769 |
|
|
|
| 770 |
|
|
return ret;
|
| 771 |
|
|
}
|
| 772 |
|
|
|
| 773 |
|
|
/* EPP mode, reverse channel, data. */
|
| 774 |
|
|
size_t parport_ieee1284_epp_read_data (struct parport *port,
|
| 775 |
|
|
void *buffer, size_t len,
|
| 776 |
|
|
int flags)
|
| 777 |
|
|
{
|
| 778 |
|
|
unsigned char *bp = (unsigned char *) buffer;
|
| 779 |
|
|
unsigned ret = 0;
|
| 780 |
|
|
|
| 781 |
|
|
/* set EPP idle state (just to make sure) with strobe high */
|
| 782 |
|
|
parport_frob_control (port,
|
| 783 |
|
|
PARPORT_CONTROL_STROBE |
|
| 784 |
|
|
PARPORT_CONTROL_AUTOFD |
|
| 785 |
|
|
PARPORT_CONTROL_SELECT |
|
| 786 |
|
|
PARPORT_CONTROL_INIT,
|
| 787 |
|
|
PARPORT_CONTROL_INIT);
|
| 788 |
|
|
port->ops->data_reverse (port);
|
| 789 |
|
|
for (; len > 0; len--, bp++) {
|
| 790 |
|
|
/* Event 67: set nAutoFd (nDStrb) low */
|
| 791 |
|
|
parport_frob_control (port,
|
| 792 |
|
|
PARPORT_CONTROL_AUTOFD,
|
| 793 |
|
|
PARPORT_CONTROL_AUTOFD);
|
| 794 |
|
|
/* Event 58: wait for Busy to go high */
|
| 795 |
|
|
if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) {
|
| 796 |
|
|
break;
|
| 797 |
|
|
}
|
| 798 |
|
|
|
| 799 |
|
|
*bp = parport_read_data (port);
|
| 800 |
|
|
|
| 801 |
|
|
/* Event 63: set nAutoFd (nDStrb) high */
|
| 802 |
|
|
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
|
| 803 |
|
|
|
| 804 |
|
|
/* Event 60: wait for Busy to go low */
|
| 805 |
|
|
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
|
| 806 |
|
|
PARPORT_STATUS_BUSY, 5)) {
|
| 807 |
|
|
break;
|
| 808 |
|
|
}
|
| 809 |
|
|
|
| 810 |
|
|
ret++;
|
| 811 |
|
|
}
|
| 812 |
|
|
port->ops->data_forward (port);
|
| 813 |
|
|
|
| 814 |
|
|
return ret;
|
| 815 |
|
|
}
|
| 816 |
|
|
|
| 817 |
|
|
/* EPP mode, forward channel, addresses. */
|
| 818 |
|
|
size_t parport_ieee1284_epp_write_addr (struct parport *port,
|
| 819 |
|
|
const void *buffer, size_t len,
|
| 820 |
|
|
int flags)
|
| 821 |
|
|
{
|
| 822 |
|
|
unsigned char *bp = (unsigned char *) buffer;
|
| 823 |
|
|
size_t ret = 0;
|
| 824 |
|
|
|
| 825 |
|
|
/* set EPP idle state (just to make sure) with strobe low */
|
| 826 |
|
|
parport_frob_control (port,
|
| 827 |
|
|
PARPORT_CONTROL_STROBE |
|
| 828 |
|
|
PARPORT_CONTROL_AUTOFD |
|
| 829 |
|
|
PARPORT_CONTROL_SELECT |
|
| 830 |
|
|
PARPORT_CONTROL_INIT,
|
| 831 |
|
|
PARPORT_CONTROL_STROBE |
|
| 832 |
|
|
PARPORT_CONTROL_INIT);
|
| 833 |
|
|
port->ops->data_forward (port);
|
| 834 |
|
|
for (; len > 0; len--, bp++) {
|
| 835 |
|
|
/* Event 56: Write data and set nAStrb low. */
|
| 836 |
|
|
parport_write_data (port, *bp);
|
| 837 |
|
|
parport_frob_control (port, PARPORT_CONTROL_SELECT,
|
| 838 |
|
|
PARPORT_CONTROL_SELECT);
|
| 839 |
|
|
|
| 840 |
|
|
/* Event 58: wait for busy (nWait) to go high */
|
| 841 |
|
|
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10))
|
| 842 |
|
|
break;
|
| 843 |
|
|
|
| 844 |
|
|
/* Event 59: set nAStrb high */
|
| 845 |
|
|
parport_frob_control (port, PARPORT_CONTROL_SELECT, 0);
|
| 846 |
|
|
|
| 847 |
|
|
/* Event 60: wait for busy (nWait) to go low */
|
| 848 |
|
|
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
|
| 849 |
|
|
PARPORT_STATUS_BUSY, 5))
|
| 850 |
|
|
break;
|
| 851 |
|
|
|
| 852 |
|
|
ret++;
|
| 853 |
|
|
}
|
| 854 |
|
|
|
| 855 |
|
|
/* Event 61: set strobe (nWrite) high */
|
| 856 |
|
|
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
|
| 857 |
|
|
|
| 858 |
|
|
return ret;
|
| 859 |
|
|
}
|
| 860 |
|
|
|
| 861 |
|
|
/* EPP mode, reverse channel, addresses. */
|
| 862 |
|
|
size_t parport_ieee1284_epp_read_addr (struct parport *port,
|
| 863 |
|
|
void *buffer, size_t len,
|
| 864 |
|
|
int flags)
|
| 865 |
|
|
{
|
| 866 |
|
|
unsigned char *bp = (unsigned char *) buffer;
|
| 867 |
|
|
unsigned ret = 0;
|
| 868 |
|
|
|
| 869 |
|
|
/* Set EPP idle state (just to make sure) with strobe high */
|
| 870 |
|
|
parport_frob_control (port,
|
| 871 |
|
|
PARPORT_CONTROL_STROBE |
|
| 872 |
|
|
PARPORT_CONTROL_AUTOFD |
|
| 873 |
|
|
PARPORT_CONTROL_SELECT |
|
| 874 |
|
|
PARPORT_CONTROL_INIT,
|
| 875 |
|
|
PARPORT_CONTROL_INIT);
|
| 876 |
|
|
port->ops->data_reverse (port);
|
| 877 |
|
|
for (; len > 0; len--, bp++) {
|
| 878 |
|
|
/* Event 64: set nSelectIn (nAStrb) low */
|
| 879 |
|
|
parport_frob_control (port, PARPORT_CONTROL_SELECT,
|
| 880 |
|
|
PARPORT_CONTROL_SELECT);
|
| 881 |
|
|
|
| 882 |
|
|
/* Event 58: wait for Busy to go high */
|
| 883 |
|
|
if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) {
|
| 884 |
|
|
break;
|
| 885 |
|
|
}
|
| 886 |
|
|
|
| 887 |
|
|
*bp = parport_read_data (port);
|
| 888 |
|
|
|
| 889 |
|
|
/* Event 59: set nSelectIn (nAStrb) high */
|
| 890 |
|
|
parport_frob_control (port, PARPORT_CONTROL_SELECT,
|
| 891 |
|
|
PARPORT_CONTROL_SELECT);
|
| 892 |
|
|
|
| 893 |
|
|
/* Event 60: wait for Busy to go low */
|
| 894 |
|
|
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
|
| 895 |
|
|
PARPORT_STATUS_BUSY, 5))
|
| 896 |
|
|
break;
|
| 897 |
|
|
|
| 898 |
|
|
ret++;
|
| 899 |
|
|
}
|
| 900 |
|
|
port->ops->data_forward (port);
|
| 901 |
|
|
|
| 902 |
|
|
return ret;
|
| 903 |
|
|
}
|
| 904 |
|
|
|
| 905 |
|
|
EXPORT_SYMBOL(parport_ieee1284_ecp_write_data);
|
| 906 |
|
|
EXPORT_SYMBOL(parport_ieee1284_ecp_read_data);
|
| 907 |
|
|
EXPORT_SYMBOL(parport_ieee1284_ecp_write_addr);
|
| 908 |
|
|
EXPORT_SYMBOL(parport_ieee1284_write_compat);
|
| 909 |
|
|
EXPORT_SYMBOL(parport_ieee1284_read_nibble);
|
| 910 |
|
|
EXPORT_SYMBOL(parport_ieee1284_read_byte);
|
| 911 |
|
|
EXPORT_SYMBOL(parport_ieee1284_epp_write_data);
|
| 912 |
|
|
EXPORT_SYMBOL(parport_ieee1284_epp_read_data);
|
| 913 |
|
|
EXPORT_SYMBOL(parport_ieee1284_epp_write_addr);
|
| 914 |
|
|
EXPORT_SYMBOL(parport_ieee1284_epp_read_addr);
|
