/* $NetBSD: lpc_com.c,v 1.5 2018/12/08 17:46:09 thorpej Exp $ */
/* adapted from:
* NetBSD: gemini_com.c,v 1.1 2008/10/24 04:23:18 matt Exp
*/
/*
* Based on arch/arm/xscale/pxa2x0_com.c
*
* Copyright 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Steve C. Woodford for Wasabi Systems, Inc.
*
* 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 product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lpc_com.c,v 1.5 2018/12/08 17:46:09 thorpej Exp $");
#include "opt_com.h"
#include "locators.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/termios.h>
#include <sys/callout.h>
#include <sys/kernel.h>
#include <machine/intr.h>
#include <sys/bus.h>
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#include <arm/gemini/gemini_obiovar.h>
#include <arm/gemini/gemini_lpchcvar.h>
#include <arm/gemini/gemini_lpcvar.h>
#include <arm/gemini/gemini_reg.h>
#include <arm/gemini/lpc_com.h>
typedef struct lpc_com_softc {
struct com_softc sc_com;
bus_addr_t sc_addr;
bus_size_t sc_size;
int sc_intr;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct callout sc_callout;
} lpc_com_softc_t;
static int lpc_com_match(device_t, cfdata_t , void *);
static void lpc_com_attach(device_t, device_t, void *);
static int lpc_com_intr(void *);
static void lpc_com_time(void *);
CFATTACH_DECL_NEW(lpc_com, sizeof(struct lpc_com_softc),
lpc_com_match, lpc_com_attach, NULL, NULL);
static int
lpc_com_match(device_t parent, cfdata_t cf, void *aux)
{
struct gemini_lpc_attach_args *lpc = aux;
lpctag_t lpctag;
bus_space_tag_t iot;
bus_space_handle_t ioh;
bus_addr_t iobase;
int rv;
if (lpc->lpc_addr == LPCCF_LDN_DEFAULT
|| lpc->lpc_addr == LPCCF_ADDR_DEFAULT)
panic("lpc_com must have ldn and addr"
" in config.");
if ((lpc->lpc_intr != LPCCF_INTR_DEFAULT) && (lpc->lpc_intr > 0xff))
panic("lpc_com: bad intr %d", lpc->lpc_intr);
if (lpc->lpc_size == LPCCF_SIZE_DEFAULT)
lpc->lpc_size = IT8712F_UART_SIZE;
iobase = lpc->lpc_base + lpc->lpc_addr;
if (com_is_console(lpc->lpc_iot, iobase, NULL))
return 1;
lpctag = lpc->lpc_tag;
lpc_pnp_enter(lpctag);
/* Activate */
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x30, 0x01);
/* Set address */
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x60,
(lpc->lpc_addr % 0xff00) >> 8);
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x61,
(lpc->lpc_addr % 0x00ff) >> 0);
/* Set Interrupt Level */
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0x70, lpc->lpc_intr);
/* Set Special Configuration Regs */
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf0, 0x00);
#if 0
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x50);
#else
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf1, 0x58); /* LO */
#endif
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf2, 0x00);
lpc_pnp_write(lpctag, lpc->lpc_ldn, 0xf3, 0x7f);
lpc_pnp_exit(lpctag);
iot = lpc->lpc_iot;
if (bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh))
return 0;
rv = comprobe1(iot, ioh);
bus_space_unmap(iot, ioh, lpc->lpc_size);
return rv;
}
static void
lpc_com_attach(device_t parent, device_t self, void *aux)
{
struct lpc_com_softc *sc = device_private(self);
struct gemini_lpc_attach_args *lpc = aux;
bus_space_tag_t iot;
bus_space_handle_t ioh;
bus_addr_t iobase;
sc->sc_com.sc_dev = self;
iot = lpc->lpc_iot;
iobase = lpc->lpc_base + lpc->lpc_addr;
sc->sc_com.sc_frequency = IT8712F_COM_FREQ;
sc->sc_com.sc_type = COM_TYPE_NORMAL;
if (com_is_console(iot, iobase, &ioh) == 0 &&
bus_space_map(iot, iobase, lpc->lpc_size, 0, &ioh)) {
panic(": can't map registers\n");
return;
}
com_init_regs(&sc->sc_com.sc_regs, iot, ioh, iobase);
com_attach_subr(&sc->sc_com);
aprint_naive("\n");
if (lpc->lpc_intr == LPCCF_INTR_DEFAULT) {
/* callout based polliung */
callout_init(&sc->sc_callout, 0);
callout_setfunc(&sc->sc_callout, lpc_com_time, sc);
callout_schedule(&sc->sc_callout, hz/16);
aprint_normal("%s: callout polling mode\n", device_xname(self));
} else {
/* interrupting */
#if 0
lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
IPL_SERIAL, IST_LEVEL_HIGH, comintr, &sc->sc_com);
#else
lpc_intr_establish(lpc->lpc_tag, lpc->lpc_intr,
IPL_SERIAL, IST_LEVEL_LOW, lpc_com_intr, &sc->sc_com);
#endif
}
}
int
lpc_com_intr(void *arg)
{
printf(".");
return comintr(arg);
}
void
lpc_com_time(void *arg)
{
lpc_com_softc_t *sc = arg;
int s;
s = splserial();
(void)comintr(&sc->sc_com);
callout_schedule(&sc->sc_callout, hz/16);
splx(s);
}