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_acpi.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004 Nate Lawson (SDG)
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *      notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *      notice, this list of conditions and the following disclaimer in the
   14  *      documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/12/sys/dev/fdc/fdc_acpi.c 326255 2017-11-27 14:52:40Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/bio.h>
   35 #include <sys/bus.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 #include <sys/proc.h>
   39 
   40 #include <contrib/dev/acpica/include/acpi.h>
   41 
   42 #include <dev/acpica/acpivar.h>
   43 #include <dev/fdc/fdcvar.h>
   44 
   45 static int              fdc_acpi_probe(device_t dev);
   46 static int              fdc_acpi_attach(device_t dev);
   47 static int              fdc_acpi_probe_children(device_t bus, device_t dev,
   48                             void *fde);
   49 static ACPI_STATUS      fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev,
   50                             int level, void *arg);
   51 
   52 /* Maximum number of child devices of a controller (4 floppy + 1 tape.) */
   53 #define ACPI_FDC_MAXDEVS        5
   54 
   55 /* Standard size of buffer returned by the _FDE method. */
   56 #define ACPI_FDC_FDE_LEN        (ACPI_FDC_MAXDEVS * sizeof(uint32_t))
   57 
   58 /*
   59  * Parameters for the tape drive (5th device).  Some BIOS authors use this
   60  * for all drives, not just the tape drive (e.g., ASUS K8V).  This isn't
   61  * grossly incompatible with the spec since it says the first four devices
   62  * are simple booleans.
   63  */
   64 #define ACPI_FD_UNKNOWN         0
   65 #define ACPI_FD_PRESENT         1
   66 #define ACPI_FD_NEVER_PRESENT   2
   67 
   68 /* Temporary buf length for evaluating _FDE and _FDI. */
   69 #define ACPI_FDC_BUFLEN         1024
   70 
   71 /* Context for walking FDC child devices. */
   72 struct fdc_walk_ctx {
   73         uint32_t        fd_present[ACPI_FDC_MAXDEVS];
   74         int             index;
   75         device_t        acpi_dev;
   76         device_t        dev;
   77 };
   78 
   79 static int
   80 fdc_acpi_probe(device_t dev)
   81 {
   82         device_t bus;
   83         static char *fdc_ids[] = { "PNP0700", "PNP0701", NULL };
   84 
   85         bus = device_get_parent(dev);
   86         if (ACPI_ID_PROBE(bus, dev, fdc_ids) == NULL)
   87                 return (ENXIO);
   88 
   89         if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL)))
   90                 device_set_desc(dev, "floppy drive controller (FDE)");
   91         else
   92                 device_set_desc(dev, "floppy drive controller");
   93         return (0);
   94 }
   95 
   96 static int
   97 fdc_acpi_attach(device_t dev)
   98 {
   99         struct fdc_data *sc;
  100         ACPI_BUFFER buf;
  101         ACPI_OBJECT *obj;
  102         device_t bus;
  103         int error;
  104 
  105         /* Get our softc and use the same accessor as ISA. */
  106         sc = device_get_softc(dev);
  107         sc->fdc_dev = dev;
  108 
  109         /* Initialize variables and get a temporary buffer for _FDE. */
  110         error = ENXIO;
  111         buf.Length = ACPI_FDC_BUFLEN;
  112         buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO);
  113         if (buf.Pointer == NULL)
  114                 goto out;
  115 
  116         /* Allocate resources the same as the ISA attachment. */
  117         error = fdc_isa_alloc_resources(dev, sc);
  118         if (error != 0)
  119                 goto out;
  120 
  121         /* Call common attach code in fdc(4) first. */
  122         error = fdc_attach(dev);
  123         if (error != 0)
  124                 goto out;
  125 
  126         /*
  127          * Enumerate _FDE, which lists floppy drives that are present.  If
  128          * this fails, fall back to the ISA hints-based probe method.
  129          */
  130         bus = device_get_parent(dev);
  131         if (ACPI_FAILURE(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) {
  132                 error = fdc_hints_probe(dev);
  133                 goto out;
  134         }
  135 
  136         /* Add fd child devices as specified. */
  137         obj = buf.Pointer;
  138         error = fdc_acpi_probe_children(bus, dev, obj->Buffer.Pointer);
  139 
  140 out:
  141         if (buf.Pointer)
  142                 free(buf.Pointer, M_TEMP);
  143         if (error != 0)
  144                 fdc_release_resources(sc);
  145         else
  146                 fdc_start_worker(dev);
  147 
  148         return (error);
  149 }
  150 
  151 static int
  152 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde)
  153 {
  154         struct fdc_walk_ctx *ctx;
  155         devclass_t fd_dc;
  156         int i;
  157 
  158         /* Setup the context and walk all child devices. */
  159         ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT);
  160         if (ctx == NULL) {
  161                 device_printf(dev, "no memory for walking children\n");
  162                 return (ENOMEM);
  163         }
  164         bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present));
  165         ctx->index = 0;
  166         ctx->dev = dev;
  167         ctx->acpi_dev = bus;
  168         ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child,
  169             ctx);
  170 
  171         /* Add any devices not represented by an AML Device handle/node. */
  172         fd_dc = devclass_find("fd");
  173         for (i = 0; i < ACPI_FDC_MAXDEVS; i++)
  174                 if (ctx->fd_present[i] == ACPI_FD_PRESENT &&
  175                     devclass_get_device(fd_dc, i) == NULL) {
  176                         if (fdc_add_child(dev, "fd", i) == NULL)
  177                                 device_printf(dev, "fd add failed\n");
  178                 }
  179         free(ctx, M_TEMP);
  180 
  181         /* Attach any children found during the probe. */
  182         return (bus_generic_attach(dev));
  183 }
  184 
  185 static ACPI_STATUS
  186 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg)
  187 {
  188         struct fdc_walk_ctx *ctx;
  189         device_t child, old_child;
  190         ACPI_BUFFER buf;
  191         ACPI_OBJECT *pkg, *obj;
  192         ACPI_STATUS status;
  193 
  194         ctx = (struct fdc_walk_ctx *)arg;
  195         buf.Pointer = NULL;
  196 
  197         /*
  198          * The first four ints are booleans that indicate whether fd0-3 are
  199          * present or not.  The last is for a tape device, which we don't
  200          * bother supporting for now.
  201          */
  202         if (ctx->index > 3)
  203                 return (AE_OK);
  204 
  205         /* This device is not present, move on to the next. */
  206         if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT)
  207                 goto out;
  208 
  209         /* Create a device for the child with the given index. */
  210         child = fdc_add_child(ctx->dev, "fd", ctx->index);
  211         if (child == NULL)
  212                 goto out;
  213         old_child = *dev;
  214         *dev = child;
  215 
  216         /* Get temporary buffer for _FDI probe. */
  217         buf.Length = ACPI_FDC_BUFLEN;
  218         buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO);
  219         if (buf.Pointer == NULL)
  220                 goto out;
  221 
  222         /*
  223          * Evaluate _FDI to get drive type to pass to the child.  We use the
  224          * old child here since it has a valid ACPI_HANDLE since it is a
  225          * child of acpi.  A better way to implement this would be to make fdc
  226          * support the ACPI handle ivar for its children.
  227          */
  228         status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL,
  229             &buf);
  230         if (ACPI_FAILURE(status)) {
  231                 if (status != AE_NOT_FOUND)
  232                         device_printf(ctx->dev, "_FDI failed - %#x\n", status);
  233                 goto out;
  234         }
  235         pkg = (ACPI_OBJECT *)buf.Pointer;
  236         if (!ACPI_PKG_VALID(pkg, 16)) {
  237                 device_printf(ctx->dev, "invalid _FDI package\n");
  238                 goto out;
  239         }
  240         obj = &pkg->Package.Elements[1];
  241         if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) {
  242                 device_printf(ctx->dev, "invalid type object in _FDI\n");
  243                 goto out;
  244         }
  245         fdc_set_fdtype(child, obj->Integer.Value);
  246 
  247 out:
  248         ctx->index++;
  249         if (buf.Pointer)
  250                 free(buf.Pointer, M_TEMP);
  251         return (AE_OK);
  252 }
  253 
  254 static device_method_t fdc_acpi_methods[] = {
  255         /* Device interface */
  256         DEVMETHOD(device_probe,         fdc_acpi_probe),
  257         DEVMETHOD(device_attach,        fdc_acpi_attach),
  258         DEVMETHOD(device_detach,        fdc_detach),
  259 
  260         /* Bus interface */
  261         DEVMETHOD(bus_print_child,      fdc_print_child),
  262         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
  263         DEVMETHOD(bus_write_ivar,       fdc_write_ivar),
  264 
  265         DEVMETHOD_END
  266 };
  267 
  268 static driver_t fdc_acpi_driver = {
  269         "fdc",
  270         fdc_acpi_methods,
  271         sizeof(struct fdc_data)
  272 };
  273 
  274 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0);

Cache object: e5823508ef4614df3beb72a98c5201d7


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