875f70dba4
and the Z8530 drivers used the I/O address as a quick and dirty way to determine which channel they operated on, but formalizing this by introducing iobase is not a solution. How for example would a driver know which channel it controls for a multi-channel UART that only has a single I/O range? Instead, add an explicit field, called chan, to struct uart_bas that holds the channel within a device, or 0 otherwise. The chan field is initialized both by the system device probing (i.e. a system console) or it is passed down to uart_bus_probe() by any of the bus front-ends. As such, it impacts all platforms and bus drivers and makes it a rather large commit. Remove the use of iobase in uart_cpu_eqres() for pc98. It is expected that platforms have the capability to compare tag and handle pairs for equality; as to determine whether two pairs access the same device or not. The use of iobase for pc98 makes it impossible to formalize this and turn it into a real newbus function later. This commit reverts uart_cpu_eqres() for pc98 to an unimplemented function. It has to be reimplemented using only the tag and handle fields in struct uart_bas. Rewrite the SAB82532 and Z8530 drivers to use the chan field in struct uart_bas. Remove the IS_CHANNEL_A and IS_CHANNEL_B macros. We don't need to abstract anything anymore. Discussed with: nyan Tested on: i386, ia64, sparc64
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*-
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* Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <dev/ofw/openfirm.h>
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#include <sparc64/ebus/ebusvar.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_cpu.h>
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static int uart_ebus_probe(device_t dev);
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static device_method_t uart_ebus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, uart_ebus_probe),
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DEVMETHOD(device_attach, uart_bus_attach),
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DEVMETHOD(device_detach, uart_bus_detach),
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{ 0, 0 }
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};
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static driver_t uart_ebus_driver = {
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uart_driver_name,
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uart_ebus_methods,
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sizeof(struct uart_softc),
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};
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static int
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uart_ebus_probe(device_t dev)
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{
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const char *nm;
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struct uart_softc *sc;
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int error;
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sc = device_get_softc(dev);
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sc->sc_class = NULL;
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nm = ebus_get_name(dev);
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if (!strcmp(nm, "su")) {
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sc->sc_class = &uart_ns8250_class;
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return (uart_bus_probe(dev, 0, 0, 0, 0));
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}
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if (!strcmp(nm, "se")) {
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sc->sc_class = &uart_sab82532_class;
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error = uart_bus_probe(dev, 0, 0, 0, 1);
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return ((error) ? error : -1);
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}
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return (ENXIO);
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}
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DRIVER_MODULE(uart, ebus, uart_ebus_driver, uart_devclass, 0, 0);
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