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: head/sys/dev/fdc/fdc_acpi.c 339754 2018-10-26 00:05:46Z takawata $");
   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         int rv;
   85 
   86         bus = device_get_parent(dev);
   87         rv = ACPI_ID_PROBE(bus, dev, fdc_ids, NULL);
   88         if (rv > 0)
   89                 return (rv);
   90 
   91         if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL)))
   92                 device_set_desc(dev, "floppy drive controller (FDE)");
   93         else
   94                 device_set_desc(dev, "floppy drive controller");
   95         return (rv);
   96 }
   97 
   98 static int
   99 fdc_acpi_attach(device_t dev)
  100 {
  101         struct fdc_data *sc;
  102         ACPI_BUFFER buf;
  103         ACPI_OBJECT *obj;
  104         device_t bus;
  105         int error;
  106 
  107         /* Get our softc and use the same accessor as ISA. */
  108         sc = device_get_softc(dev);
  109         sc->fdc_dev = dev;
  110 
  111         /* Initialize variables and get a temporary buffer for _FDE. */
  112         error = ENXIO;
  113         buf.Length = ACPI_FDC_BUFLEN;
  114         buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO);
  115         if (buf.Pointer == NULL)
  116                 goto out;
  117 
  118         /* Allocate resources the same as the ISA attachment. */
  119         error = fdc_isa_alloc_resources(dev, sc);
  120         if (error != 0)
  121                 goto out;
  122 
  123         /* Call common attach code in fdc(4) first. */
  124         error = fdc_attach(dev);
  125         if (error != 0)
  126                 goto out;
  127 
  128         /*
  129          * Enumerate _FDE, which lists floppy drives that are present.  If
  130          * this fails, fall back to the ISA hints-based probe method.
  131          */
  132         bus = device_get_parent(dev);
  133         if (ACPI_FAILURE(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) {
  134                 error = fdc_hints_probe(dev);
  135                 goto out;
  136         }
  137 
  138         /* Add fd child devices as specified. */
  139         obj = buf.Pointer;
  140         error = fdc_acpi_probe_children(bus, dev, obj->Buffer.Pointer);
  141 
  142 out:
  143         if (buf.Pointer)
  144                 free(buf.Pointer, M_TEMP);
  145         if (error != 0)
  146                 fdc_release_resources(sc);
  147         else
  148                 fdc_start_worker(dev);
  149 
  150         return (error);
  151 }
  152 
  153 static int
  154 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde)
  155 {
  156         struct fdc_walk_ctx *ctx;
  157         devclass_t fd_dc;
  158         int i;
  159 
  160         /* Setup the context and walk all child devices. */
  161         ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT);
  162         if (ctx == NULL) {
  163                 device_printf(dev, "no memory for walking children\n");
  164                 return (ENOMEM);
  165         }
  166         bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present));
  167         ctx->index = 0;
  168         ctx->dev = dev;
  169         ctx->acpi_dev = bus;
  170         ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child,
  171             ctx);
  172 
  173         /* Add any devices not represented by an AML Device handle/node. */
  174         fd_dc = devclass_find("fd");
  175         for (i = 0; i < ACPI_FDC_MAXDEVS; i++)
  176                 if (ctx->fd_present[i] == ACPI_FD_PRESENT &&
  177                     devclass_get_device(fd_dc, i) == NULL) {
  178                         if (fdc_add_child(dev, "fd", i) == NULL)
  179                                 device_printf(dev, "fd add failed\n");
  180                 }
  181         free(ctx, M_TEMP);
  182 
  183         /* Attach any children found during the probe. */
  184         return (bus_generic_attach(dev));
  185 }
  186 
  187 static ACPI_STATUS
  188 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg)
  189 {
  190         struct fdc_walk_ctx *ctx;
  191         device_t child, old_child;
  192         ACPI_BUFFER buf;
  193         ACPI_OBJECT *pkg, *obj;
  194         ACPI_STATUS status;
  195 
  196         ctx = (struct fdc_walk_ctx *)arg;
  197         buf.Pointer = NULL;
  198 
  199         /*
  200          * The first four ints are booleans that indicate whether fd0-3 are
  201          * present or not.  The last is for a tape device, which we don't
  202          * bother supporting for now.
  203          */
  204         if (ctx->index > 3)
  205                 return (AE_OK);
  206 
  207         /* This device is not present, move on to the next. */
  208         if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT)
  209                 goto out;
  210 
  211         /* Create a device for the child with the given index. */
  212         child = fdc_add_child(ctx->dev, "fd", ctx->index);
  213         if (child == NULL)
  214                 goto out;
  215         old_child = *dev;
  216         *dev = child;
  217 
  218         /* Get temporary buffer for _FDI probe. */
  219         buf.Length = ACPI_FDC_BUFLEN;
  220         buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO);
  221         if (buf.Pointer == NULL)
  222                 goto out;
  223 
  224         /*
  225          * Evaluate _FDI to get drive type to pass to the child.  We use the
  226          * old child here since it has a valid ACPI_HANDLE since it is a
  227          * child of acpi.  A better way to implement this would be to make fdc
  228          * support the ACPI handle ivar for its children.
  229          */
  230         status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL,
  231             &buf);
  232         if (ACPI_FAILURE(status)) {
  233                 if (status != AE_NOT_FOUND)
  234                         device_printf(ctx->dev, "_FDI failed - %#x\n", status);
  235                 goto out;
  236         }
  237         pkg = (ACPI_OBJECT *)buf.Pointer;
  238         if (!ACPI_PKG_VALID(pkg, 16)) {
  239                 device_printf(ctx->dev, "invalid _FDI package\n");
  240                 goto out;
  241         }
  242         obj = &pkg->Package.Elements[1];
  243         if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) {
  244                 device_printf(ctx->dev, "invalid type object in _FDI\n");
  245                 goto out;
  246         }
  247         fdc_set_fdtype(child, obj->Integer.Value);
  248 
  249 out:
  250         ctx->index++;
  251         if (buf.Pointer)
  252                 free(buf.Pointer, M_TEMP);
  253         return (AE_OK);
  254 }
  255 
  256 static device_method_t fdc_acpi_methods[] = {
  257         /* Device interface */
  258         DEVMETHOD(device_probe,         fdc_acpi_probe),
  259         DEVMETHOD(device_attach,        fdc_acpi_attach),
  260         DEVMETHOD(device_detach,        fdc_detach),
  261 
  262         /* Bus interface */
  263         DEVMETHOD(bus_print_child,      fdc_print_child),
  264         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
  265         DEVMETHOD(bus_write_ivar,       fdc_write_ivar),
  266 
  267         DEVMETHOD_END
  268 };
  269 
  270 static driver_t fdc_acpi_driver = {
  271         "fdc",
  272         fdc_acpi_methods,
  273         sizeof(struct fdc_data)
  274 };
  275 
  276 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0);

Cache object: 14c0eeac4fa3c6a3c672c1968d61333d


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