/* $NetBSD: lpt_pioc.c,v 1.13 2019/12/27 09:28:41 msaitoh Exp $ */ /* * Copyright (c) 1997 Mark Brinicombe * Copyright (c) 1997 Causality Limited * 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. The name of the company nor the name of the author may be used to * endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR OR CONTRIBUTERS 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. */ /* * Device Driver for AT parallel printer port */ #include <sys/param.h> __KERNEL_RCSID(0, "$NetBSD: lpt_pioc.c,v 1.13 2019/12/27 09:28:41 msaitoh Exp $"); #include <sys/systm.h> #include <sys/kernel.h> #include <sys/device.h> #include <sys/bus.h> #include <machine/intr.h> #include <acorn32/mainbus/piocvar.h> #include <dev/ic/lptreg.h> #include <dev/ic/lptvar.h> #include "locators.h" /* Prototypes for functions */ static int lpt_port_test (bus_space_tag_t, bus_space_handle_t, bus_addr_t, bus_size_t, u_char, u_char); static int lptprobe (bus_space_tag_t, u_int); static int lpt_pioc_probe (device_t, cfdata_t , void *); static void lpt_pioc_attach (device_t, device_t, void *); /* device attach structure */ CFATTACH_DECL_NEW(lpt_pioc, sizeof(struct lpt_softc), lpt_pioc_probe, lpt_pioc_attach, NULL, NULL); /* * Internal routine to lptprobe to do port tests of one byte value. */ static 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; data &= mask; bus_space_write_1(iot, ioh, off, data); timeout = 1000; do { delay(10); temp = bus_space_read_1(iot, ioh, off) & mask; } while (temp != data && --timeout); return (temp == data); } /* * 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 */ static int lptprobe(bus_space_tag_t iot, u_int iobase) { bus_space_handle_t ioh; u_char mask, data; int i, rv; #ifdef DEBUG #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ goto out;} while (0) #else #define ABORT goto out #endif if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) return 0; rv = 0; mask = 0xff; data = 0x55; /* Alternating zeros */ if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) ABORT; data = 0xaa; /* Alternating ones */ if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) ABORT; for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ data = ~(1 << i); if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) ABORT; } for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ data = (1 << i); if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) ABORT; } bus_space_write_1(iot, ioh, lpt_data, 0); bus_space_write_1(iot, ioh, lpt_control, 0); rv = LPT_NPORTS; out: bus_space_unmap(iot, ioh, LPT_NPORTS); return rv; } /* * int lpt_pioc_probe(device_t parent, cfdata_t cf, void *aux) * * Make sure we are trying to attach a lpt device and then * probe for one. */ static int lpt_pioc_probe(device_t parent, cfdata_t match, void *aux) { struct pioc_attach_args *pa = aux; int rv; if (pa->pa_name && strcmp(pa->pa_name, "lpt") != 0) return(0); /* We need an offset */ if (pa->pa_offset == PIOCCF_OFFSET_DEFAULT) return(0); rv = lptprobe(pa->pa_iot, pa->pa_iobase + pa->pa_offset); if (rv) { pa->pa_iosize = rv; return(1); } return(0); } /* * void lpt_pioc_attach(device_t parent, device_t self, void *aux) * * attach the lpt device */ static void lpt_pioc_attach(device_t parent, device_t self, void *aux) { struct lpt_softc *sc = device_private(self); struct pioc_attach_args *pa = aux; bus_space_tag_t iot; bus_space_handle_t ioh; u_int iobase; sc->sc_dev = self; if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) aprint_normal("\n"); else aprint_normal(": polled\n"); iobase = pa->pa_iobase + pa->pa_offset; iot = sc->sc_iot = pa->pa_iot; if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) { aprint_error_dev(self, "couldn't map I/O ports"); return; } sc->sc_ioh = ioh; lpt_attach_subr(sc); if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) sc->sc_ih = intr_claim(pa->pa_irq, IPL_TTY, "lpt", lptintr, sc); } /* End of lpt_pioc.c */
