freebsd-skq/sys/dev/uart/uart_bus_puc.c
Marcel Moolenaar 875f70dba4 Revert the introduction of iobase in struct uart_bas. Both the SAB82532
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
2003-09-26 05:14:56 +00:00

100 lines
3.0 KiB
C

/*-
* Copyright (c) 2002 JF Hay. All rights reserved.
* Copyright (c) 2001 M. Warner Losh. 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/pci/pcivar.h>
#include <dev/puc/pucvar.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_bus.h>
static int uart_puc_probe(device_t dev);
static device_method_t uart_puc_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, uart_puc_probe),
DEVMETHOD(device_attach, uart_bus_attach),
DEVMETHOD(device_detach, uart_bus_detach),
{ 0, 0 }
};
static driver_t uart_puc_driver = {
uart_driver_name,
uart_puc_methods,
sizeof(struct uart_softc),
};
static int
uart_puc_probe(device_t dev)
{
device_t parent;
struct uart_softc *sc;
uintptr_t port, rclk, regshft, type;
parent = device_get_parent(dev);
sc = device_get_softc(dev);
if (BUS_READ_IVAR(parent, dev, PUC_IVAR_SUBTYPE, &type))
return (ENXIO);
switch (type) {
case PUC_PORT_UART_NS8250:
sc->sc_class = &uart_ns8250_class;
port = 0;
break;
case PUC_PORT_UART_SAB82532:
sc->sc_class = &uart_sab82532_class;
if (BUS_READ_IVAR(parent, dev, PUC_IVAR_PORT, &port))
port = 0;
break;
case PUC_PORT_UART_Z8530:
sc->sc_class = &uart_z8530_class;
if (BUS_READ_IVAR(parent, dev, PUC_IVAR_PORT, &port))
port = 0;
break;
default:
return (ENXIO);
}
if (BUS_READ_IVAR(parent, dev, PUC_IVAR_FREQ, &rclk))
rclk = 0;
if (BUS_READ_IVAR(parent, dev, PUC_IVAR_REGSHFT, &regshft))
regshft = 0;
return (uart_bus_probe(dev, regshft, rclk, 0, port));
}
DRIVER_MODULE(uart, puc, uart_puc_driver, uart_devclass, 0, 0);