xref: /openbsd/sys/dev/puc/com_puc.c (revision 78a91e64)

/*	$OpenBSD: com_puc.c,v 1.3 2001/08/08 15:10:03 mickey Exp $	*/

/*
 * Copyright (c) 1997 - 1999, Jason Downs.  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. Neither the name(s) of the author(s) nor the name OpenBSD
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/types.h>
#include <sys/device.h>

#include <machine/intr.h>
#include <machine/bus.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pucvar.h>

#include <dev/isa/isavar.h>	/* XXX */

#include "com.h"
#ifdef i386
#include "pccom.h"
#endif

#include <dev/ic/comreg.h>
#if NPCCOM > 0
#include <i386/isa/pccomvar.h>
#endif
#if NCOM > 0
#include <dev/ic/comvar.h>
#endif
#include <dev/ic/ns16550reg.h>

#define	com_lcr		com_cfcr
#define	SET(t, f)	(t) |= (f)

int com_puc_match __P((struct device *, void *, void *));
void com_puc_attach __P((struct device *, struct device *, void *));

#if NCOM_PUC
struct cfattach com_puc_ca = {
	sizeof(struct com_softc), com_puc_match, com_puc_attach
};
#endif

#if NPCCOM_PUC
struct cfattach pccom_puc_ca = {
	sizeof(struct com_softc), com_puc_match, com_puc_attach
};
#endif

void com_puc_attach2 __P((struct com_softc *));

int
com_puc_match(parent, match, aux)
	struct device *parent;
	void *match, *aux;
{
	struct puc_attach_args *pa = aux;

	if (pa->type == PUC_PORT_TYPE_COM)
		return(1);

	return(0);
}

void
com_puc_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct com_softc *sc = (void *)self;
	struct puc_attach_args *pa = aux;
	const char *intrstr;

	/* Grab a PCI interrupt. */
	intrstr = pci_intr_string(pa->pc, pa->intrhandle);
	sc->sc_ih = pci_intr_establish(pa->pc, pa->intrhandle,
			IPL_HIGH, comintr, sc,
			sc->sc_dev.dv_xname);
	if (sc->sc_ih == NULL) {
		printf(": couldn't establish interrupt");
		if (intrstr != NULL)
			printf(" at %s", intrstr);
		printf("\n");
		return;
	}
	printf(" %s", intrstr);

	sc->sc_iot = pa->t;
	sc->sc_ioh = pa->h;
	sc->sc_iobase = pa->a;
	sc->sc_frequency = COM_FREQ;

	if (pa->flags)
		sc->sc_frequency = pa->flags & PUC_COM_CLOCKMASK;

	com_puc_attach2(sc);
}

/*
 * XXX This should be handled by a generic attach
 */
void
com_puc_attach2(sc)
	struct com_softc *sc;
{
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh = sc->sc_ioh;
	u_int8_t lcr;

	sc->sc_hwflags = 0;
	sc->sc_swflags = 0;

	timeout_set(&sc->sc_dtr_tmo, com_raisedtr, sc);
	timeout_set(&sc->sc_diag_tmo, comdiag, sc);

	/*
	 * Probe for all known forms of UART.
	 */
	lcr = bus_space_read_1(iot, ioh, com_lcr);

	bus_space_write_1(iot, ioh, com_lcr, LCR_EFR);
	bus_space_write_1(iot, ioh, com_efr, 0);
	bus_space_write_1(iot, ioh, com_lcr, 0);

	bus_space_write_1(iot, ioh, com_fifo, FIFO_ENABLE);
	delay(100);

	switch(bus_space_read_1(iot, ioh, com_iir) >> 6) {
	case 0:
		sc->sc_uarttype = COM_UART_16450;
		break;
	case 2:
		sc->sc_uarttype = COM_UART_16550;
		break;
	case 3:
		sc->sc_uarttype = COM_UART_16550A;
		break;
	default:
		sc->sc_uarttype = COM_UART_UNKNOWN;
		break;
	}

	if (sc->sc_uarttype == COM_UART_16550A) { /* Probe for ST16650s */
		bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB);
		if (bus_space_read_1(iot, ioh, com_efr) == 0) {
			sc->sc_uarttype = COM_UART_ST16650;
		} else {
			bus_space_write_1(iot, ioh, com_lcr, LCR_EFR);
			if (bus_space_read_1(iot, ioh, com_efr) == 0)
				sc->sc_uarttype = COM_UART_ST16650V2;
		}
	}

#if NPCCOM > 0
#ifdef i386
	if (sc->sc_uarttype == COM_UART_ST16650V2) {	/* Probe for XR16850s */
		u_int8_t dlbl, dlbh;

		/* Enable latch access and get the current values. */
		bus_space_write_1(iot, ioh, com_lcr, lcr | LCR_DLAB);
		dlbl = bus_space_read_1(iot, ioh, com_dlbl);
		dlbh = bus_space_read_1(iot, ioh, com_dlbh);

		/* Zero out the latch divisors */
		bus_space_write_1(iot, ioh, com_dlbl, 0);
		bus_space_write_1(iot, ioh, com_dlbh, 0);

		if (bus_space_read_1(iot, ioh, com_dlbh) == 0x10) {
			sc->sc_uarttype = COM_UART_XR16850;
			sc->sc_uartrev = bus_space_read_1(iot, ioh, com_dlbl);
		}

		/* Reset to original. */
		bus_space_write_1(iot, ioh, com_dlbl, dlbl);
		bus_space_write_1(iot, ioh, com_dlbh, dlbh);
	}
#endif
#endif

	/* Reset the LCR (latch access is probably enabled). */
	bus_space_write_1(iot, ioh, com_lcr, lcr);
	if (sc->sc_uarttype == COM_UART_16450) { /* Probe for 8250 */
		u_int8_t scr0, scr1, scr2;

		scr0 = bus_space_read_1(iot, ioh, com_scratch);
		bus_space_write_1(iot, ioh, com_scratch, 0xa5);
		scr1 = bus_space_read_1(iot, ioh, com_scratch);
		bus_space_write_1(iot, ioh, com_scratch, 0x5a);
		scr2 = bus_space_read_1(iot, ioh, com_scratch);
		bus_space_write_1(iot, ioh, com_scratch, scr0);

		if ((scr1 != 0xa5) || (scr2 != 0x5a))
			sc->sc_uarttype = COM_UART_8250;
	}

	/*
	 * Print UART type and initialize ourself.
	 */
	sc->sc_fifolen = 1;	/* default */
	switch (sc->sc_uarttype) {
	case COM_UART_UNKNOWN:
		printf(": unknown uart\n");
		break;
	case COM_UART_8250:
		printf(": ns8250, no fifo\n");
		break;
	case COM_UART_16450:
		printf(": ns16450, no fifo\n");
		break;
	case COM_UART_16550:
		printf(": ns16550, no working fifo\n");
		break;
	case COM_UART_16550A:
		printf(": ns16550a, 16 byte fifo\n");
		SET(sc->sc_hwflags, COM_HW_FIFO);
		sc->sc_fifolen = 16;
		break;
	case COM_UART_ST16650:
		printf(": st16650, no working fifo\n");
		break;
	case COM_UART_ST16650V2:
		printf(": st16650, 32 byte fifo\n");
		SET(sc->sc_hwflags, COM_HW_FIFO);
		sc->sc_fifolen = 32;
		break;
#if NPCCOM > 0
#ifdef i386
	case COM_UART_XR16850:
		printf(": xr16850 (rev %d), 128 byte fifo\n", sc->sc_uartrev);
		SET(sc->sc_hwflags, COM_HW_FIFO);
		sc->sc_fifolen = 128;
		break;
#endif
#endif
	default:
		panic("comattach: bad fifo type");
	}

	/* clear and disable fifo */
	bus_space_write_1(iot, ioh, com_fifo, FIFO_RCV_RST | FIFO_XMT_RST);
	(void)bus_space_read_1(iot, ioh, com_data);
	bus_space_write_1(iot, ioh, com_fifo, 0);
}