linux/drivers/parport/ieee1284_ops.c

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License cleanup: add SPDX GPL-2.0 license identifier to files with no license Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 14:07:57 +00:00
// SPDX-License-Identifier: GPL-2.0
/* IEEE-1284 operations for parport.
*
* This file is for generic IEEE 1284 operations. The idea is that
* they are used by the low-level drivers. If they have a special way
* of doing something, they can provide their own routines (and put
* the function pointers in port->ops); if not, they can just use these
* as a fallback.
*
* Note: Make no assumptions about hardware or architecture in this file!
*
* Author: Tim Waugh <tim@cyberelk.demon.co.uk>
* Fixed AUTOFD polarity in ecp_forward_to_reverse(). Fred Barnes, 1999
* Software emulated EPP fixes, Fred Barnes, 04/2001.
*/
#include <linux/module.h>
#include <linux/parport.h>
#include <linux/delay.h>
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#undef DEBUG /* undef me for production */
#ifdef CONFIG_LP_CONSOLE
#undef DEBUG /* Don't want a garbled console */
#endif
/*** *
* One-way data transfer functions. *
* ***/
/* Compatibility mode. */
size_t parport_ieee1284_write_compat (struct parport *port,
const void *buffer, size_t len,
int flags)
{
int no_irq = 1;
ssize_t count = 0;
const unsigned char *addr = buffer;
unsigned char byte;
struct pardevice *dev = port->physport->cad;
unsigned char ctl = (PARPORT_CONTROL_SELECT
| PARPORT_CONTROL_INIT);
if (port->irq != PARPORT_IRQ_NONE) {
parport_enable_irq (port);
no_irq = 0;
}
port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
parport_write_control (port, ctl);
parport_data_forward (port);
while (count < len) {
unsigned long expire = jiffies + dev->timeout;
long wait = msecs_to_jiffies(10);
unsigned char mask = (PARPORT_STATUS_ERROR
| PARPORT_STATUS_BUSY);
unsigned char val = (PARPORT_STATUS_ERROR
| PARPORT_STATUS_BUSY);
/* Wait until the peripheral's ready */
do {
/* Is the peripheral ready yet? */
if (!parport_wait_peripheral (port, mask, val))
/* Skip the loop */
goto ready;
/* Is the peripheral upset? */
if ((parport_read_status (port) &
(PARPORT_STATUS_PAPEROUT |
PARPORT_STATUS_SELECT |
PARPORT_STATUS_ERROR))
!= (PARPORT_STATUS_SELECT |
PARPORT_STATUS_ERROR))
/* If nFault is asserted (i.e. no
* error) and PAPEROUT and SELECT are
* just red herrings, give the driver
* a chance to check it's happy with
* that before continuing. */
goto stop;
/* Have we run out of time? */
if (!time_before (jiffies, expire))
break;
/* Yield the port for a while. If this is the
first time around the loop, don't let go of
the port. This way, we find out if we have
our interrupt handler called. */
if (count && no_irq) {
parport_release (dev);
schedule_timeout_interruptible(wait);
parport_claim_or_block (dev);
}
else
/* We must have the device claimed here */
parport_wait_event (port, wait);
/* Is there a signal pending? */
if (signal_pending (current))
break;
/* Wait longer next time. */
wait *= 2;
} while (time_before (jiffies, expire));
if (signal_pending (current))
break;
pr_debug("%s: Timed out\n", port->name);
break;
ready:
/* Write the character to the data lines. */
byte = *addr++;
parport_write_data (port, byte);
udelay (1);
/* Pulse strobe. */
parport_write_control (port, ctl | PARPORT_CONTROL_STROBE);
udelay (1); /* strobe */
parport_write_control (port, ctl);
udelay (1); /* hold */
/* Assume the peripheral received it. */
count++;
/* Let another process run if it needs to. */
if (time_before (jiffies, expire))
if (!parport_yield_blocking (dev)
&& need_resched())
schedule ();
}
stop:
port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return count;
}
/* Nibble mode. */
size_t parport_ieee1284_read_nibble (struct parport *port,
void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
unsigned char *buf = buffer;
int i;
unsigned char byte = 0;
len *= 2; /* in nibbles */
for (i=0; i < len; i++) {
unsigned char nibble;
/* Does the error line indicate end of data? */
if (((i & 1) == 0) &&
(parport_read_status(port) & PARPORT_STATUS_ERROR)) {
goto end_of_data;
}
/* Event 7: Set nAutoFd low. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 9: nAck goes low. */
port->ieee1284.phase = IEEE1284_PH_REV_DATA;
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK, 0)) {
/* Timeout -- no more data? */
pr_debug("%s: Nibble timeout at event 9 (%d bytes)\n",
port->name, i / 2);
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
break;
}
/* Read a nibble. */
nibble = parport_read_status (port) >> 3;
nibble &= ~8;
if ((nibble & 0x10) == 0)
nibble |= 8;
nibble &= 0xf;
/* Event 10: Set nAutoFd high. */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 11: nAck goes high. */
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* Timeout -- no more data? */
pr_debug("%s: Nibble timeout at event 11\n",
port->name);
break;
}
if (i & 1) {
/* Second nibble */
byte |= nibble << 4;
*buf++ = byte;
} else
byte = nibble;
}
if (i == len) {
/* Read the last nibble without checking data avail. */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
end_of_data:
pr_debug("%s: No more nibble data (%d bytes)\n",
port->name, i / 2);
/* Go to reverse idle phase. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
}
else
port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
}
return i/2;
#endif /* IEEE1284 support */
}
/* Byte mode. */
size_t parport_ieee1284_read_byte (struct parport *port,
void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
unsigned char *buf = buffer;
ssize_t count = 0;
for (count = 0; count < len; count++) {
unsigned char byte;
/* Data available? */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
goto end_of_data;
}
/* Event 14: Place data bus in high impedance state. */
parport_data_reverse (port);
/* Event 7: Set nAutoFd low. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 9: nAck goes low. */
port->physport->ieee1284.phase = IEEE1284_PH_REV_DATA;
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK,
0)) {
/* Timeout -- no more data? */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
0);
pr_debug("%s: Byte timeout at event 9\n", port->name);
break;
}
byte = parport_read_data (port);
*buf++ = byte;
/* Event 10: Set nAutoFd high */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 11: nAck goes high. */
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* Timeout -- no more data? */
pr_debug("%s: Byte timeout at event 11\n", port->name);
break;
}
/* Event 16: Set nStrobe low. */
parport_frob_control (port,
PARPORT_CONTROL_STROBE,
PARPORT_CONTROL_STROBE);
udelay (5);
/* Event 17: Set nStrobe high. */
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
}
if (count == len) {
/* Read the last byte without checking data avail. */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
end_of_data:
pr_debug("%s: No more byte data (%zd bytes)\n",
port->name, count);
/* Go to reverse idle phase. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
}
else
port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
}
return count;
#endif /* IEEE1284 support */
}
/*** *
* ECP Functions. *
* ***/
#ifdef CONFIG_PARPORT_1284
static inline
int ecp_forward_to_reverse (struct parport *port)
{
int retval;
/* Event 38: Set nAutoFd low */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
parport_data_reverse (port);
udelay (5);
/* Event 39: Set nInit low to initiate bus reversal */
parport_frob_control (port,
PARPORT_CONTROL_INIT,
0);
/* Event 40: PError goes low */
retval = parport_wait_peripheral (port,
PARPORT_STATUS_PAPEROUT, 0);
if (!retval) {
pr_debug("%s: ECP direction: reverse\n", port->name);
port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
} else {
pr_debug("%s: ECP direction: failed to reverse\n", port->name);
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
}
return retval;
}
static inline
int ecp_reverse_to_forward (struct parport *port)
{
int retval;
/* Event 47: Set nInit high */
parport_frob_control (port,
PARPORT_CONTROL_INIT
| PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_INIT
| PARPORT_CONTROL_AUTOFD);
/* Event 49: PError goes high */
retval = parport_wait_peripheral (port,
PARPORT_STATUS_PAPEROUT,
PARPORT_STATUS_PAPEROUT);
if (!retval) {
parport_data_forward (port);
pr_debug("%s: ECP direction: forward\n", port->name);
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
} else {
pr_debug("%s: ECP direction: failed to switch forward\n",
port->name);
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
}
return retval;
}
#endif /* IEEE1284 support */
/* ECP mode, forward channel, data. */
size_t parport_ieee1284_ecp_write_data (struct parport *port,
const void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
const unsigned char *buf = buffer;
size_t written;
int retry;
port = port->physport;
if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
if (ecp_reverse_to_forward (port))
return 0;
port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
/* HostAck high (data, not command) */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD
| PARPORT_CONTROL_STROBE
| PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
for (written = 0; written < len; written++, buf++) {
unsigned long expire = jiffies + port->cad->timeout;
unsigned char byte;
byte = *buf;
try_again:
parport_write_data (port, byte);
parport_frob_control (port, PARPORT_CONTROL_STROBE,
PARPORT_CONTROL_STROBE);
udelay (5);
for (retry = 0; retry < 100; retry++) {
if (!parport_wait_peripheral (port,
PARPORT_STATUS_BUSY, 0))
goto success;
if (signal_pending (current)) {
parport_frob_control (port,
PARPORT_CONTROL_STROBE,
0);
break;
}
}
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
pr_debug("%s: ECP transfer stalled!\n", port->name);
parport_frob_control (port, PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
udelay (50);
if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
/* It's buggered. */
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
break;
}
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
udelay (50);
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
break;
pr_debug("%s: Host transfer recovered\n", port->name);
if (time_after_eq (jiffies, expire)) break;
goto try_again;
success:
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
udelay (5);
if (parport_wait_peripheral (port,
PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY))
/* Peripheral hasn't accepted the data. */
break;
}
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return written;
#endif /* IEEE1284 support */
}
/* ECP mode, reverse channel, data. */
size_t parport_ieee1284_ecp_read_data (struct parport *port,
void *buffer, size_t len, int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
struct pardevice *dev = port->cad;
unsigned char *buf = buffer;
int rle_count = 0; /* shut gcc up */
unsigned char ctl;
int rle = 0;
ssize_t count = 0;
port = port->physport;
if (port->ieee1284.phase != IEEE1284_PH_REV_IDLE)
if (ecp_forward_to_reverse (port))
return 0;
port->ieee1284.phase = IEEE1284_PH_REV_DATA;
/* Set HostAck low to start accepting data. */
ctl = parport_read_control (port);
ctl &= ~(PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT |
PARPORT_CONTROL_AUTOFD);
parport_write_control (port,
ctl | PARPORT_CONTROL_AUTOFD);
while (count < len) {
unsigned long expire = jiffies + dev->timeout;
unsigned char byte;
int command;
/* Event 43: Peripheral sets nAck low. It can take as
long as it wants. */
while (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) {
/* The peripheral hasn't given us data in
35ms. If we have data to give back to the
caller, do it now. */
if (count)
goto out;
/* If we've used up all the time we were allowed,
give up altogether. */
if (!time_before (jiffies, expire))
goto out;
/* Yield the port for a while. */
if (dev->port->irq != PARPORT_IRQ_NONE) {
parport_release (dev);
schedule_timeout_interruptible(msecs_to_jiffies(40));
parport_claim_or_block (dev);
}
else
/* We must have the device claimed here. */
parport_wait_event (port, msecs_to_jiffies(40));
/* Is there a signal pending? */
if (signal_pending (current))
goto out;
}
/* Is this a command? */
if (rle)
/* The last byte was a run-length count, so
this can't be as well. */
command = 0;
else
command = (parport_read_status (port) &
PARPORT_STATUS_BUSY) ? 1 : 0;
/* Read the data. */
byte = parport_read_data (port);
/* If this is a channel command, rather than an RLE
command or a normal data byte, don't accept it. */
if (command) {
if (byte & 0x80) {
pr_debug("%s: stopping short at channel command (%02x)\n",
port->name, byte);
goto out;
}
else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE)
pr_debug("%s: device illegally using RLE; accepting anyway\n",
port->name);
rle_count = byte + 1;
/* Are we allowed to read that many bytes? */
if (rle_count > (len - count)) {
pr_debug("%s: leaving %d RLE bytes for next time\n",
port->name, rle_count);
break;
}
rle = 1;
}
/* Event 44: Set HostAck high, acknowledging handshake. */
parport_write_control (port, ctl);
/* Event 45: The peripheral has 35ms to set nAck high. */
if (parport_wait_peripheral (port, PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* It's gone wrong. Return what data we have
to the caller. */
pr_debug("ECP read timed out at 45\n");
if (command)
pr_warn("%s: command ignored (%02x)\n",
port->name, byte);
break;
}
/* Event 46: Set HostAck low and accept the data. */
parport_write_control (port,
ctl | PARPORT_CONTROL_AUTOFD);
/* If we just read a run-length count, fetch the data. */
if (command)
continue;
/* If this is the byte after a run-length count, decompress. */
if (rle) {
rle = 0;
memset (buf, byte, rle_count);
buf += rle_count;
count += rle_count;
pr_debug("%s: decompressed to %d bytes\n",
port->name, rle_count);
} else {
/* Normal data byte. */
*buf = byte;
buf++, count++;
}
}
out:
port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
return count;
#endif /* IEEE1284 support */
}
/* ECP mode, forward channel, commands. */
size_t parport_ieee1284_ecp_write_addr (struct parport *port,
const void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
const unsigned char *buf = buffer;
size_t written;
int retry;
port = port->physport;
if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
if (ecp_reverse_to_forward (port))
return 0;
port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
/* HostAck low (command, not data) */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD
| PARPORT_CONTROL_STROBE
| PARPORT_CONTROL_INIT,
PARPORT_CONTROL_AUTOFD
| PARPORT_CONTROL_INIT);
for (written = 0; written < len; written++, buf++) {
unsigned long expire = jiffies + port->cad->timeout;
unsigned char byte;
byte = *buf;
try_again:
parport_write_data (port, byte);
parport_frob_control (port, PARPORT_CONTROL_STROBE,
PARPORT_CONTROL_STROBE);
udelay (5);
for (retry = 0; retry < 100; retry++) {
if (!parport_wait_peripheral (port,
PARPORT_STATUS_BUSY, 0))
goto success;
if (signal_pending (current)) {
parport_frob_control (port,
PARPORT_CONTROL_STROBE,
0);
break;
}
}
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
pr_debug("%s: ECP transfer stalled!\n", port->name);
parport_frob_control (port, PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
udelay (50);
if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
/* It's buggered. */
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
break;
}
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
udelay (50);
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
break;
pr_debug("%s: Host transfer recovered\n", port->name);
if (time_after_eq (jiffies, expire)) break;
goto try_again;
success:
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
udelay (5);
if (parport_wait_peripheral (port,
PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY))
/* Peripheral hasn't accepted the data. */
break;
}
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return written;
#endif /* IEEE1284 support */
}
/*** *
* EPP functions. *
* ***/
/* EPP mode, forward channel, data. */
size_t parport_ieee1284_epp_write_data (struct parport *port,
const void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
size_t ret = 0;
/* set EPP idle state (just to make sure) with strobe low */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_INIT);
port->ops->data_forward (port);
for (; len > 0; len--, bp++) {
/* Event 62: Write data and set autofd low */
parport_write_data (port, *bp);
parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 58: wait for busy (nWait) to go high */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10))
break;
/* Event 63: set nAutoFd (nDStrb) high */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 60: wait for busy (nWait) to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5))
break;
ret++;
}
/* Event 61: set strobe (nWrite) high */
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
return ret;
}
/* EPP mode, reverse channel, data. */
size_t parport_ieee1284_epp_read_data (struct parport *port,
void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
unsigned ret = 0;
/* set EPP idle state (just to make sure) with strobe high */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
port->ops->data_reverse (port);
for (; len > 0; len--, bp++) {
/* Event 67: set nAutoFd (nDStrb) low */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 58: wait for Busy to go high */
if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) {
break;
}
*bp = parport_read_data (port);
/* Event 63: set nAutoFd (nDStrb) high */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 60: wait for Busy to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5)) {
break;
}
ret++;
}
port->ops->data_forward (port);
return ret;
}
/* EPP mode, forward channel, addresses. */
size_t parport_ieee1284_epp_write_addr (struct parport *port,
const void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
size_t ret = 0;
/* set EPP idle state (just to make sure) with strobe low */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_INIT);
port->ops->data_forward (port);
for (; len > 0; len--, bp++) {
/* Event 56: Write data and set nAStrb low. */
parport_write_data (port, *bp);
parport_frob_control (port, PARPORT_CONTROL_SELECT,
PARPORT_CONTROL_SELECT);
/* Event 58: wait for busy (nWait) to go high */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10))
break;
/* Event 59: set nAStrb high */
parport_frob_control (port, PARPORT_CONTROL_SELECT, 0);
/* Event 60: wait for busy (nWait) to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5))
break;
ret++;
}
/* Event 61: set strobe (nWrite) high */
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
return ret;
}
/* EPP mode, reverse channel, addresses. */
size_t parport_ieee1284_epp_read_addr (struct parport *port,
void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
unsigned ret = 0;
/* Set EPP idle state (just to make sure) with strobe high */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
port->ops->data_reverse (port);
for (; len > 0; len--, bp++) {
/* Event 64: set nSelectIn (nAStrb) low */
parport_frob_control (port, PARPORT_CONTROL_SELECT,
PARPORT_CONTROL_SELECT);
/* Event 58: wait for Busy to go high */
if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) {
break;
}
*bp = parport_read_data (port);
/* Event 59: set nSelectIn (nAStrb) high */
parport_frob_control (port, PARPORT_CONTROL_SELECT,
parport: fix ieee1284_epp_read_addr We bought cheap notebooks to control our custom data acquisition system, which requires EPP mode (read/write, data/addr). The bios does not offer EPP mode, and indeed hardware EPP mode appears not to work, although the parport driver tries to use it. EPPSWE mode does work for data r/w and addr write, but addr read requires this patch. (stephan)rshgse3: lspci 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS/940GML and 945GT Express Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller (rev 03) 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02) 00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 02) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02) 00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7 Family) Serial ATA Storage Controller AHCI (rev 02) 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02) 02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8055 PCI-E Gigabit Ethernet Controller (rev 12) 05:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02) 08:03.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b3) 08:03.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C552 IEEE 1394 Controller (rev 08) 08:03.2 Generic system peripheral [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 17) (stephan)rshgse3: grep . /proc/sys/dev/parport/parport0/* /proc/sys/dev/parport/parport0/base-addr:888 1912 /proc/sys/dev/parport/parport0/dma:-1 /proc/sys/dev/parport/parport0/irq:7 /proc/sys/dev/parport/parport0/modes:PCSPP,TRISTATE,EPP /proc/sys/dev/parport/parport0/spintime:500 Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-08 12:20:56 +00:00
0);
/* Event 60: wait for Busy to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5))
break;
ret++;
}
port->ops->data_forward (port);
return ret;
}
EXPORT_SYMBOL(parport_ieee1284_ecp_write_data);
EXPORT_SYMBOL(parport_ieee1284_ecp_read_data);
EXPORT_SYMBOL(parport_ieee1284_ecp_write_addr);
EXPORT_SYMBOL(parport_ieee1284_write_compat);
EXPORT_SYMBOL(parport_ieee1284_read_nibble);
EXPORT_SYMBOL(parport_ieee1284_read_byte);
EXPORT_SYMBOL(parport_ieee1284_epp_write_data);
EXPORT_SYMBOL(parport_ieee1284_epp_read_data);
EXPORT_SYMBOL(parport_ieee1284_epp_write_addr);
EXPORT_SYMBOL(parport_ieee1284_epp_read_addr);