/*
* Copyright (c) 1998 Michael Shalayeff
* Copyright (c) 1993, 1994 Charles Hannum.
* Copyright (c) 1990 William F. Jolitz, TeleMuse
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This software is a component of "386BSD" developed by
* William F. Jolitz, TeleMuse.
* 4. Neither the name of the developer nor the name "386BSD"
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
* NOT MAKE USE OF THIS WORK.
*
* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
int lpt_port_test(bus_space_tag_t, bus_space_handle_t, bus_addr_t,
bus_size_t, u_char, u_char);
/*
* Internal routine to lptprobe to do port tests of one byte value.
*/
int
lpt_port_test(bus_space_tag_t iot, bus_space_handle_t ioh, bus_addr_t base,
bus_size_t off, u_char data, u_char mask)
{
int timeout;
u_char temp;
/*
* Logic:
* 1) You should be able to write to and read back the same value
* to the data port. Do an alternating zeros, alternating ones,
* walking zero, and walking one test to check for stuck bits.
*
* 2) You should be able to write to and read back the same value
* to the control port lower 5 bits, the upper 3 bits are reserved
* per the IBM PC technical reference manuals and different boards
* do different things with them. Do an alternating zeros, alternating
* ones, walking zero, and walking one test to check for stuck bits.
*
* Some printers drag the strobe line down when the are powered off
* so this bit has been masked out of the control port test.
*
* XXX Some printers may not like a fast pulse on init or strobe, I
* don't know at this point, if that becomes a problem these bits
* should be turned off in the mask byte for the control port test.
*
* 3) Set the data and control ports to a value of 0
*/
int
lpt_gsc_probe(device_t parent, cfdata_t match, void *aux)
{
struct gsc_attach_args *ga = aux;
bus_space_handle_t ioh;
bus_addr_t base;
uint8_t mask, data;
int i;
if (ga->ga_type.iodc_type != HPPA_TYPE_FIO ||
ga->ga_type.iodc_sv_model != HPPA_FIO_CENT)
return 0;
#ifdef DEBUG
#define ABORT \
do { \
printf("lpt_gsc_probe: mask %x data %x failed\n", mask, \
data); \
bus_space_unmap(ga->ga_iot, ioh, LPT_NPORTS); \
return 0; \
} while (0)
#else
#define ABORT \
do { \
bus_space_unmap(ga->ga_iot, ioh, LPT_NPORTS); \
return 0; \
} while (0)
#endif
base = ga->ga_hpa + LPTGSC_OFFSET;
if (bus_space_map(ga->ga_iot, base, LPT_NPORTS, 0, &ioh))
return 0;
mask = 0xff;
data = 0x55; /* Alternating zeros */
if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
ABORT;
data = 0xaa; /* Alternating ones */
if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
ABORT;
for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */
data = ~(1 << i);
if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
ABORT;
}
for (i = 0; i < CHAR_BIT; i++) { /* Walking one */
data = (1 << i);
if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
ABORT;
}
