The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/fdc/fdc_isa.c

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    1 /*-
    2  * Copyright (c) 2004-2005 M. Warner Losh.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.3/sys/dev/fdc/fdc_isa.c 143618 2005-03-15 08:02:47Z imp $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bio.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/module.h>
   36 #include <sys/mutex.h>
   37 #include <sys/rman.h>
   38 #include <sys/systm.h>
   39 
   40 #include <machine/bus.h>
   41 
   42 #include <dev/fdc/fdcvar.h>
   43 
   44 #include <isa/isavar.h>
   45 #include <isa/isareg.h>
   46 
   47 static int fdc_isa_probe(device_t);
   48 
   49 static struct isa_pnp_id fdc_ids[] = {
   50         {0x0007d041, "PC standard floppy controller"}, /* PNP0700 */
   51         {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
   52         {0}
   53 };
   54 
   55 /*
   56  * On standard ISA, we don't just use an 8 port range
   57  * (e.g. 0x3f0-0x3f7) since that covers an IDE control register at
   58  * 0x3f6.  So, on older hardware, we use 0x3f0-0x3f5 and 0x3f7.
   59  * However, some BIOSs omit the control port, while others start at
   60  * 0x3f2.  Of the latter, sometimes we have two resources, other times
   61  * we have one.  We have to deal with the following cases:
   62  *
   63  * 1:   0x3f0-0x3f5                     # very rare
   64  * 2:   0x3f0                           # hints -> 0x3f0-0x3f5,0x3f7
   65  * 3:   0x3f0-0x3f5,0x3f7               # Most common
   66  * 4:   0x3f2-0x3f5,0x3f7               # Second most common
   67  * 5:   0x3f2-0x3f5                     # implies 0x3f7 too.
   68  * 6:   0x3f2-0x3f3,0x3f4-0x3f5,0x3f7   # becoming common
   69  * 7:   0x3f2-0x3f3,0x3f4-0x3f5         # rare
   70  * 8:   0x3f0-0x3f1,0x3f2-0x3f3,0x3f4-0x3f5,0x3f7
   71  * 9:   0x3f0-0x3f3,0x3f4-0x3f5,0x3f7
   72  *
   73  * The following code is generic for any value of 0x3fx.  It is also
   74  * generic for all the above cases, as well as cases where things are
   75  * even weirder.
   76  */
   77 int
   78 fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc)
   79 {
   80         struct resource *res;
   81         int i, j, rid, newrid, nport;
   82         u_long port;
   83 
   84         fdc->fdc_dev = dev;
   85         rid = 0;
   86         for (i = 0; i < FDC_MAXREG; i++)
   87                 fdc->resio[i] = NULL;
   88 
   89         nport = isa_get_logicalid(dev) ? 1 : 6;
   90         for (rid = 0; ; rid++) {
   91                 newrid = rid;
   92                 res = bus_alloc_resource(dev, SYS_RES_IOPORT, &newrid,
   93                     0ul, ~0ul, rid == 0 ? nport : 1, RF_ACTIVE);
   94                 if (res == NULL)
   95                         break;
   96                 /*
   97                  * Mask off the upper bits of the register, and sanity
   98                  * check resource ranges.
   99                  */
  100                 i = rman_get_start(res) & 0x7;
  101                 if (i + rman_get_size(res) - 1 > FDC_MAXREG) {
  102                         bus_release_resource(dev, SYS_RES_IOPORT, newrid, res);
  103                         return (ENXIO);
  104                 }
  105                 for (j = 0; j < rman_get_size(res); j++) {
  106                         fdc->resio[i + j] = res;
  107                         fdc->ridio[i + j] = newrid;
  108                         fdc->ioff[i + j] = j;
  109                         fdc->ioh[i + j] = rman_get_bushandle(res);
  110                 }
  111         }
  112         if (fdc->resio[2] == NULL) {
  113                 device_printf(dev, "No FDOUT register!\n");
  114                 return (ENXIO);
  115         }
  116         fdc->iot = rman_get_bustag(fdc->resio[2]);
  117         if (fdc->resio[7] == NULL) {
  118                 port = (rman_get_start(fdc->resio[2]) & ~0x7) + 7;
  119                 newrid = rid;
  120                 res = bus_alloc_resource(dev, SYS_RES_IOPORT, &newrid, port,
  121                     port, 1, RF_ACTIVE);
  122                 if (res == NULL) {
  123                         device_printf(dev, "Faking up FDCTL\n");
  124                         fdc->resio[7] = fdc->resio[2];
  125                         fdc->ridio[7] = fdc->ridio[2];
  126                         fdc->ioff[7] = fdc->ioff[2] + 5;
  127                         fdc->ioh[7] = fdc->ioh[2];
  128                 } else {
  129                         fdc->resio[7] = res;
  130                         fdc->ridio[7] = newrid;
  131                         fdc->ioff[7] = rman_get_start(res) & 7;
  132                         fdc->ioh[7] = rman_get_bushandle(res);
  133                 }
  134         }
  135 
  136         fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &fdc->rid_irq,
  137             RF_ACTIVE | RF_SHAREABLE);
  138         if (fdc->res_irq == NULL) {
  139                 device_printf(dev, "cannot reserve interrupt line\n");
  140                 return (ENXIO);
  141         }
  142 
  143         if ((fdc->flags & FDC_NODMA) == 0) {
  144                 fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ,
  145                     &fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE);
  146                 if (fdc->res_drq == NULL) {
  147                         device_printf(dev, "cannot reserve DMA request line\n");
  148                         /* This is broken and doesn't work for ISA case */
  149                         fdc->flags |= FDC_NODMA;
  150                 } else
  151                         fdc->dmachan = rman_get_start(fdc->res_drq);
  152         }
  153 
  154         return (0);
  155 }
  156 
  157 static int
  158 fdc_isa_probe(device_t dev)
  159 {
  160         int     error;
  161         struct  fdc_data *fdc;
  162 
  163         fdc = device_get_softc(dev);
  164         fdc->fdc_dev = dev;
  165 
  166         /* Check pnp ids */
  167         error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
  168         if (error == ENXIO)
  169                 return (ENXIO);
  170 
  171         /* Attempt to allocate our resources for the duration of the probe */
  172         error = fdc_isa_alloc_resources(dev, fdc);
  173         if (error == 0)
  174                 error = fdc_initial_reset(dev, fdc);
  175 
  176         fdc_release_resources(fdc);
  177         return (error);
  178 }
  179 
  180 static int
  181 fdc_isa_attach(device_t dev)
  182 {
  183         struct  fdc_data *fdc;
  184         int error;
  185 
  186         fdc = device_get_softc(dev);
  187         fdc->fdc_dev = dev;
  188         error = fdc_isa_alloc_resources(dev, fdc);
  189         if (error == 0)
  190                 error = fdc_attach(dev);
  191         if (error == 0)
  192                 error = fdc_hints_probe(dev);
  193         if (error)
  194                 fdc_release_resources(fdc);
  195         return (error);
  196 }
  197 
  198 static device_method_t fdc_methods[] = {
  199         /* Device interface */
  200         DEVMETHOD(device_probe,         fdc_isa_probe),
  201         DEVMETHOD(device_attach,        fdc_isa_attach),
  202         DEVMETHOD(device_detach,        fdc_detach),
  203         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  204         DEVMETHOD(device_suspend,       bus_generic_suspend),
  205         DEVMETHOD(device_resume,        bus_generic_resume),
  206 
  207         /* Bus interface */
  208         DEVMETHOD(bus_print_child,      fdc_print_child),
  209         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
  210         DEVMETHOD(bus_write_ivar,       fdc_write_ivar),
  211         /* Our children never use any other bus interface methods. */
  212 
  213         { 0, 0 }
  214 };
  215 
  216 static driver_t fdc_driver = {
  217         "fdc",
  218         fdc_methods,
  219         sizeof(struct fdc_data)
  220 };
  221 
  222 DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);

Cache object: d44988bde5a04d238f1bfb0a9a1902cb


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