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/* $OpenBSD: com_puc.c,v 1.2 2001/03/15 17:52:20 deraadt 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;
/*
* 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);
}
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