0215f8085c
controllers typically have multiple channels and support a number of serial communications protocols. The scc(4) driver is itself an umbrella driver that delegates the control over each channel and mode to a subordinate driver (like uart(4)). The scc(4) driver supports the Siemens SAB 82532 and the Zilog Z8530 and replaces puc(4) for these devices.
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*-
|
|
* Copyright (c) 2004-2006 Marcel Moolenaar
|
|
* 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.
|
|
*
|
|
* 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/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <sys/rman.h>
|
|
#include <machine/resource.h>
|
|
|
|
#include <dev/scc/scc_bus.h>
|
|
|
|
#include <dev/uart/uart.h>
|
|
#include <dev/uart/uart_bus.h>
|
|
|
|
static int uart_scc_attach(device_t dev);
|
|
static int uart_scc_probe(device_t dev);
|
|
|
|
static device_method_t uart_scc_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, uart_scc_probe),
|
|
DEVMETHOD(device_attach, uart_scc_attach),
|
|
DEVMETHOD(device_detach, uart_bus_detach),
|
|
/* Serdev interface */
|
|
DEVMETHOD(serdev_ihand, uart_bus_ihand),
|
|
DEVMETHOD(serdev_sysdev, uart_bus_sysdev),
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t uart_scc_driver = {
|
|
uart_driver_name,
|
|
uart_scc_methods,
|
|
sizeof(struct uart_softc),
|
|
};
|
|
|
|
static int
|
|
uart_scc_attach(device_t dev)
|
|
{
|
|
device_t parent;
|
|
struct uart_softc *sc;
|
|
uintptr_t mtx;
|
|
|
|
parent = device_get_parent(dev);
|
|
sc = device_get_softc(dev);
|
|
|
|
if (BUS_READ_IVAR(parent, dev, SCC_IVAR_HWMTX, &mtx))
|
|
return (ENXIO);
|
|
sc->sc_hwmtx = (struct mtx *)(void *)mtx;
|
|
return (uart_bus_attach(dev));
|
|
}
|
|
|
|
static int
|
|
uart_scc_probe(device_t dev)
|
|
{
|
|
device_t parent;
|
|
struct uart_softc *sc;
|
|
uintptr_t ch, cl, md, rs;
|
|
|
|
parent = device_get_parent(dev);
|
|
sc = device_get_softc(dev);
|
|
|
|
if (BUS_READ_IVAR(parent, dev, SCC_IVAR_MODE, &md) ||
|
|
BUS_READ_IVAR(parent, dev, SCC_IVAR_CLASS, &cl))
|
|
return (ENXIO);
|
|
if (md != SCC_MODE_ASYNC)
|
|
return (ENXIO);
|
|
switch (cl) {
|
|
case SCC_CLASS_SAB82532:
|
|
sc->sc_class = &uart_sab82532_class;
|
|
break;
|
|
case SCC_CLASS_Z8530:
|
|
sc->sc_class = &uart_z8530_class;
|
|
break;
|
|
default:
|
|
return (ENXIO);
|
|
}
|
|
if (BUS_READ_IVAR(parent, dev, SCC_IVAR_CHANNEL, &ch) ||
|
|
BUS_READ_IVAR(parent, dev, SCC_IVAR_CLOCK, &cl) ||
|
|
BUS_READ_IVAR(parent, dev, SCC_IVAR_REGSHFT, &rs))
|
|
return (ENXIO);
|
|
|
|
return (uart_bus_probe(dev, rs, cl, 0, ch));
|
|
}
|
|
|
|
DRIVER_MODULE(uart, scc, uart_scc_driver, uart_devclass, 0, 0);
|