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/* $OpenBSD: cn30xxuart.c,v 1.3 2013/06/05 01:32:22 jasper Exp $ */
/*
* Copyright (c) 2001-2004 Opsycon AB (www.opsycon.se / www.opsycon.com)
*
* 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.
*
* 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 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/device.h>
#include <sys/tty.h>
#include <sys/conf.h>
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#include <dev/cons.h>
#include <octeon/dev/iobusvar.h>
#include <octeon/dev/uartbusvar.h>
int cn30xxuart_probe(struct device *, void *, void *);
void cn30xxuart_attach(struct device *, struct device *, void *);
struct cfattach cn30xxuart_ca = {
sizeof(struct com_softc), cn30xxuart_probe, cn30xxuart_attach
};
extern struct cfdriver com_cd;
cons_decl(cn30xxuart);
#define OCTEON_MIO_UART0 0x8001180000000800ull
#define OCTEON_MIO_UART0_LSR 0x8001180000000828ull
#define OCTEON_MIO_UART0_RBR 0x8001180000000800ull
#define OCTEON_MIO_UART0_USR 0x8001180000000938ull
#define OCTEON_MIO_UART0_LCR 0x8001180000000818ull
#define OCTEON_MIO_UART0_DLL 0x8001180000000880ull
#define OCTEON_MIO_UART0_DLH 0x8001180000000888ull
#define USR_TXFIFO_NOTFULL 2
static int delay_changed = 1;
int cn30xxuart_delay(void);
void cn30xxuart_wait_txhr_empty(int);
int
cn30xxuart_probe(struct device *parent, void *match, void *aux)
{
struct cfdata *cf = match;
struct uartbus_attach_args *uba = aux;
bus_space_tag_t iot = uba->uba_memt;
bus_space_handle_t ioh;
int rv = 0, console;
if (strcmp(uba->uba_name, com_cd.cd_name) != 0)
return 0;
console = 1;
/* if it's in use as console, it's there. */
if (!(console && !comconsattached)) {
if (bus_space_map(iot, uba->uba_baseaddr, COM_NPORTS, 0, &ioh)) {
printf(": can't map uart registers\n");
return 1;
}
rv = comprobe1(iot, ioh);
} else
rv = 1;
/* make a config stanza with exact locators match over a generic line */
if (cf->cf_loc[0] != -1)
rv += rv;
return rv;
}
void
cn30xxuart_attach(struct device *parent, struct device *self, void *aux)
{
struct com_softc *sc = (void *)self;
struct uartbus_attach_args *uba = aux;
int console;
console = 1;
sc->sc_iot = uba->uba_memt;
sc->sc_iobase = uba->uba_baseaddr;
sc->sc_hwflags = 0;
sc->sc_swflags = 0;
sc->sc_frequency = curcpu()->ci_hw.clock;
sc->sc_uarttype = COM_UART_16550;
/* if it's in use as console, it's there. */
if (bus_space_map(sc->sc_iot, sc->sc_iobase, COM_NPORTS, 0, &sc->sc_ioh)) {
printf(": can't map uart registers\n");
return;
}
if (console && !comconsattached) {
/*
* If we are the console, reuse the existing bus_space
* information, so that comcnattach() invokes bus_space_map()
* with correct parameters.
*/
if (comcnattach(sc->sc_iot, sc->sc_iobase, 115200,
sc->sc_frequency, (TTYDEF_CFLAG & ~(CSIZE | PARENB)) | CS8))
panic("can't setup serial console");
}
com_attach_subr(sc);
octeon_intr_establish(uba->uba_intr, IPL_TTY, comintr,
(void *)sc, sc->sc_dev.dv_xname);
}
/*
* Early console routines.
*/
int
cn30xxuart_delay(void)
{
int divisor;
u_char lcr;
static int d = 0;
if (!delay_changed) return d;
delay_changed = 0;
lcr = (u_char)*(uint64_t*)OCTEON_MIO_UART0_LCR;
*(uint64_t*)OCTEON_MIO_UART0_LCR = lcr | LCR_DLAB;
divisor = (int)(*(uint64_t*)OCTEON_MIO_UART0_DLL |
*(uint64_t*)OCTEON_MIO_UART0_DLH << 8);
*(uint64_t*)OCTEON_MIO_UART0_LCR = lcr;
return 10; /* return an approx delay value */
}
void
cn30xxuart_wait_txhr_empty(int d)
{
while (((*(uint64_t*)OCTEON_MIO_UART0_LSR & LSR_TXRDY) == 0) &&
((*(uint64_t*)OCTEON_MIO_UART0_USR & USR_TXFIFO_NOTFULL) == 0))
delay(d);
}
void
cn30xxuartcninit(struct consdev *consdev)
{
}
void
cn30xxuartcnprobe(struct consdev *consdev)
{
}
void
cn30xxuartcnpollc(dev_t dev, int c)
{
}
void
cn30xxuartcnputc (dev_t dev, int c)
{
int d;
/* 1/10th the time to transmit 1 character (estimate). */
d = cn30xxuart_delay();
cn30xxuart_wait_txhr_empty(d);
*(uint64_t*)OCTEON_MIO_UART0_RBR = (uint8_t)c;
cn30xxuart_wait_txhr_empty(d);
}
int
cn30xxuartcngetc (dev_t dev)
{
int c, d;
/* 1/10th the time to transmit 1 character (estimate). */
d = cn30xxuart_delay();
while ((*(uint64_t*)OCTEON_MIO_UART0_LSR & LSR_RXRDY) == 0)
delay(d);
c = (uint8_t)*(uint64_t*)OCTEON_MIO_UART0_RBR;
return (c);
}
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