FreeBSD-5.3/sys/dev/fdc/fdc_isa.c
/*-
* Copyright (c) 2004 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,
* without modification, immediately at the beginning of the file.
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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: src/sys/dev/fdc/fdc_isa.c,v 1.9.2.3.2.1 2004/10/28 19:40:40 imp Exp $");
#include <sys/param.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <dev/fdc/fdcvar.h>
#include <isa/isavar.h>
#include <isa/isareg.h>
static int fdc_isa_probe(device_t);
static struct isa_pnp_id fdc_ids[] = {
{0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */
{0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
{0}
};
int
fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc)
{
int nports = 6;
fdc->fdc_dev = dev;
fdc->rid_ioport = 0;
fdc->rid_irq = 0;
fdc->rid_drq = 0;
fdc->rid_ctl = 1;
/*
* On standard ISA, we don't just use an 8 port range
* (e.g. 0x3f0-0x3f7) since that covers an IDE control
* register at 0x3f6. So, on older hardware, we use
* 0x3f0-0x3f5 and 0x3f7. However, some BIOSs omit the
* control port, while others start at 0x3f2. Of the latter,
* sometimes we have two resources, other times we have one.
* We have to deal with the following cases:
*
* 1: 0x3f0-0x3f5 # very rare
* 2: 0x3f0 # hints -> 0x3f0-0x3f5,0x3f7
* 3: 0x3f0-0x3f5,0x3f7 # Most common
* 4: 0x3f2-0x3f5,0x3f7 # Second most common
* 5: 0x3f2-0x3f5 # implies 0x3f7 too.
* 6: 0x3f2-0x3f3,0x3f4-0x3f5,0x3f7 # becoming common
* 7: 0x3f2-0x3f3,0x3f4-0x3f5 # rare
* 8: 0x3f0-0x3f1,0x3f2-0x3f3,0x3f4-0x3f5,0x3f7
* 9: 0x3f0-0x3f3,0x3f4-0x3f5,0x3f7
*
* The following code is generic for any value of 0x3fx :-)
*/
/*
* First, allocated the main range of ports. In the best of
* worlds, this is 4 or 6 ports. In others, well, that's
* why this function is so complicated.
*/
again_ioport:
fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,
&fdc->rid_ioport, 0ul, ~0ul, nports, RF_ACTIVE);
if (fdc->res_ioport == 0) {
device_printf(dev, "cannot allocate I/O port (%d ports)\n",
nports);
return (ENXIO);
}
if ((rman_get_end(fdc->res_ioport) & 0x7) == 1) {
/* Case 8 */
bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
fdc->res_ioport);
fdc->rid_ioport++;
goto again_ioport;
}
fdc->portt = rman_get_bustag(fdc->res_ioport);
fdc->porth = rman_get_bushandle(fdc->res_ioport);
/*
* Handle cases 4-8 above
*/
fdc->port_off = -(fdc->porth & 0x7);
/*
* Deal with case 6-9: FDSTS and FDDATA.
*/
if ((rman_get_end(fdc->res_ioport) & 0x7) == 3) {
fdc->rid_sts = fdc->rid_ioport + 1;
fdc->res_sts = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&fdc->rid_sts, RF_ACTIVE);
if (fdc->res_sts == NULL) {
device_printf(dev, "Can't alloc rid 1");
fdc_release_resources(fdc);
return (ENXIO);
}
fdc->sts_off = -4;
fdc->stst = rman_get_bustag(fdc->res_sts);
fdc->stsh = rman_get_bushandle(fdc->res_sts);
} else {
fdc->res_sts = NULL;
fdc->sts_off = fdc->port_off;
fdc->stst = fdc->portt;
fdc->stsh = fdc->porth;
}
/*
* allocate the control port. For cases 1, 2, 5 and 7, we
* fake it from the ioports resource. XXX IS THIS THE RIGHT THING
* TO DO, OR SHOULD WE CREATE A NEW RID? (I think we need a new rid)
*/
fdc->rid_ctl = fdc->rid_sts + 1;
fdc->res_ctl = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
&fdc->rid_ctl, RF_ACTIVE);
if (fdc->res_ctl == NULL) {
fdc->ctl_off = 7 + fdc->port_off;
fdc->res_ctl = NULL;
fdc->ctlt = fdc->portt;
fdc->ctlh = fdc->porth;
} else {
fdc->ctl_off = 0;
fdc->ctlt = rman_get_bustag(fdc->res_ctl);
fdc->ctlh = rman_get_bushandle(fdc->res_ctl);
}
fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &fdc->rid_irq,
RF_ACTIVE | RF_SHAREABLE);
if (fdc->res_irq == 0) {
device_printf(dev, "cannot reserve interrupt line\n");
return (ENXIO);
}
if ((fdc->flags & FDC_NODMA) == 0) {
fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ,
&fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE);
if (fdc->res_drq == 0) {
device_printf(dev, "cannot reserve DMA request line\n");
/* This is broken and doesn't work for ISA case */
fdc->flags |= FDC_NODMA;
} else
fdc->dmachan = rman_get_start(fdc->res_drq);
}
return (0);
}
static int
fdc_isa_probe(device_t dev)
{
int error;
struct fdc_data *fdc;
fdc = device_get_softc(dev);
fdc->fdc_dev = dev;
/* Check pnp ids */
error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
if (error == ENXIO)
return (ENXIO);
/* Attempt to allocate our resources for the duration of the probe */
error = fdc_isa_alloc_resources(dev, fdc);
if (error == 0)
error = fdc_initial_reset(dev, fdc);
fdc_release_resources(fdc);
return (error);
}
static int
fdc_isa_attach(device_t dev)
{
struct fdc_data *fdc;
int error;
fdc = device_get_softc(dev);
error = fdc_isa_alloc_resources(dev, fdc);
if (error == 0)
error = fdc_attach(dev);
if (error == 0)
error = fdc_hints_probe(dev);
if (error)
fdc_release_resources(fdc);
return (error);
}
static device_method_t fdc_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, fdc_isa_probe),
DEVMETHOD(device_attach, fdc_isa_attach),
DEVMETHOD(device_detach, fdc_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_print_child, fdc_print_child),
DEVMETHOD(bus_read_ivar, fdc_read_ivar),
DEVMETHOD(bus_write_ivar, fdc_write_ivar),
/* Our children never use any other bus interface methods. */
{ 0, 0 }
};
static driver_t fdc_driver = {
"fdc",
fdc_methods,
sizeof(struct fdc_data)
};
DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);