65cbf19ef7
Rather than have a twisty maze of special case allocations, move instead to a data driven allocation. This should be the most robust way to cope with the resource problems that the multiplicity of ways of encoding 5 registers that have the misfortune of not being a power of 2 nor contiguous. Also, make it less impossible that pccard will work. I've not been able to get my libretto floppy working, but it now fails later than before. phk and I had similar ideas on this during the 5.3 release cycle, but it wasn't until recently that I could test more than one allocation scenario. MFC After: 1 month (5.4 if possible, 5.5 if not)
200 lines
5.7 KiB
C
200 lines
5.7 KiB
C
/*-
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* Copyright (c) 2004-2005 M. Warner Losh.
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER 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/bio.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/rman.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <dev/fdc/fdcvar.h>
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#include <isa/isavar.h>
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#include <isa/isareg.h>
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static int fdc_isa_probe(device_t);
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static struct isa_pnp_id fdc_ids[] = {
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{0x0007d041, "PC standard floppy controller"}, /* PNP0700 */
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{0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
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{0}
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};
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/*
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* On standard ISA, we don't just use an 8 port range
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* (e.g. 0x3f0-0x3f7) since that covers an IDE control register at
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* 0x3f6. So, on older hardware, we use 0x3f0-0x3f5 and 0x3f7.
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* However, some BIOSs omit the control port, while others start at
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* 0x3f2. Of the latter, sometimes we have two resources, other times
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* we have one. We have to deal with the following cases:
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*
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* 1: 0x3f0-0x3f5 # very rare
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* 2: 0x3f0 # hints -> 0x3f0-0x3f5,0x3f7
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* 3: 0x3f0-0x3f5,0x3f7 # Most common
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* 4: 0x3f2-0x3f5,0x3f7 # Second most common
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* 5: 0x3f2-0x3f5 # implies 0x3f7 too.
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* 6: 0x3f2-0x3f3,0x3f4-0x3f5,0x3f7 # becoming common
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* 7: 0x3f2-0x3f3,0x3f4-0x3f5 # rare
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* 8: 0x3f0-0x3f1,0x3f2-0x3f3,0x3f4-0x3f5,0x3f7
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* 9: 0x3f0-0x3f3,0x3f4-0x3f5,0x3f7
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*
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* The following code is generic for any value of 0x3fx. It is also
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* generic for all the above cases, as well as cases where things are
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* even weirder.
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*/
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int
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fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc)
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{
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struct resource *res;
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int nports = 6;
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int i, j, rid, newrid;
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fdc->fdc_dev = dev;
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rid = 0;
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for (i = 0; i < FDC_MAXREG; i++)
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fdc->resio[i] = NULL;
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for (rid = 0; ; rid++) {
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newrid = rid;
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res = bus_alloc_resource(dev, SYS_RES_IOPORT,
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&newrid, 0ul, ~0ul, nports, RF_ACTIVE);
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if (res == NULL)
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break;
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i = rman_get_start(res);
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for (j = 0; j < rman_get_size(res); j++) {
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fdc->resio[i + j] = res;
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fdc->ridio[i + j] = newrid;
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fdc->ioff[i + j] = j;
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fdc->ioh[i + j] = rman_get_bushandle(res);
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}
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}
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if (fdc->resio[2] == NULL)
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return (ENXIO);
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fdc->iot = rman_get_bustag(fdc->resio[2]);
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if (fdc->resio[7] == NULL) {
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/* XXX allocate */
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fdc->resio[7] = fdc->resio[2];
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fdc->ridio[7] = fdc->ridio[2];
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fdc->ioff[7] = fdc->ioff[2] + 5;
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fdc->ioh[7] = fdc->ioh[2];
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}
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fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &fdc->rid_irq,
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RF_ACTIVE | RF_SHAREABLE);
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if (fdc->res_irq == NULL) {
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device_printf(dev, "cannot reserve interrupt line\n");
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return (ENXIO);
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}
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if ((fdc->flags & FDC_NODMA) == 0) {
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fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ,
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&fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE);
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if (fdc->res_drq == NULL) {
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device_printf(dev, "cannot reserve DMA request line\n");
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/* This is broken and doesn't work for ISA case */
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fdc->flags |= FDC_NODMA;
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} else
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fdc->dmachan = rman_get_start(fdc->res_drq);
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}
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return (0);
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}
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static int
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fdc_isa_probe(device_t dev)
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{
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int error;
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struct fdc_data *fdc;
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fdc = device_get_softc(dev);
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fdc->fdc_dev = dev;
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/* Check pnp ids */
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error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
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if (error == ENXIO)
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return (ENXIO);
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/* Attempt to allocate our resources for the duration of the probe */
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error = fdc_isa_alloc_resources(dev, fdc);
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if (error == 0)
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error = fdc_initial_reset(dev, fdc);
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fdc_release_resources(fdc);
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return (error);
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}
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static int
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fdc_isa_attach(device_t dev)
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{
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struct fdc_data *fdc;
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int error;
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fdc = device_get_softc(dev);
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error = fdc_isa_alloc_resources(dev, fdc);
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if (error == 0)
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error = fdc_attach(dev);
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if (error == 0)
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error = fdc_hints_probe(dev);
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if (error)
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fdc_release_resources(fdc);
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return (error);
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}
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static device_method_t fdc_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, fdc_isa_probe),
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DEVMETHOD(device_attach, fdc_isa_attach),
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DEVMETHOD(device_detach, fdc_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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/* Bus interface */
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DEVMETHOD(bus_print_child, fdc_print_child),
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DEVMETHOD(bus_read_ivar, fdc_read_ivar),
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DEVMETHOD(bus_write_ivar, fdc_write_ivar),
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/* Our children never use any other bus interface methods. */
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{ 0, 0 }
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};
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static driver_t fdc_driver = {
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"fdc",
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fdc_methods,
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sizeof(struct fdc_data)
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};
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DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);
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