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  * Copyright (c) 2004 Nate Lawson (SDG)
    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/9.0/sys/dev/fdc/fdc_acpi.c 208650 2010-05-30 03:45:41Z jkim $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/bio.h>
   33 #include <sys/bus.h>
   34 #include <sys/malloc.h>
   35 #include <sys/module.h>
   36 #include <sys/proc.h>
   37 
   38 #include <contrib/dev/acpica/include/acpi.h>
   39 
   40 #include <dev/acpica/acpivar.h>
   41 #include <dev/fdc/fdcvar.h>
   42 
   43 static int              fdc_acpi_probe(device_t dev);
   44 static int              fdc_acpi_attach(device_t dev);
   45 static int              fdc_acpi_probe_children(device_t bus, device_t dev,
   46                             void *fde);
   47 static ACPI_STATUS      fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev,
   48                             int level, void *arg);
   49 
   50 /* Maximum number of child devices of a controller (4 floppy + 1 tape.) */
   51 #define ACPI_FDC_MAXDEVS        5
   52 
   53 /* Standard size of buffer returned by the _FDE method. */
   54 #define ACPI_FDC_FDE_LEN        (ACPI_FDC_MAXDEVS * sizeof(uint32_t))
   55 
   56 /*
   57  * Parameters for the tape drive (5th device).  Some BIOS authors use this
   58  * for all drives, not just the tape drive (e.g., ASUS K8V).  This isn't
   59  * grossly incompatible with the spec since it says the first four devices
   60  * are simple booleans.
   61  */
   62 #define ACPI_FD_UNKNOWN         0
   63 #define ACPI_FD_PRESENT         1
   64 #define ACPI_FD_NEVER_PRESENT   2
   65 
   66 /* Temporary buf length for evaluating _FDE and _FDI. */
   67 #define ACPI_FDC_BUFLEN         1024
   68 
   69 /* Context for walking FDC child devices. */
   70 struct fdc_walk_ctx {
   71         uint32_t        fd_present[ACPI_FDC_MAXDEVS];
   72         int             index;
   73         device_t        acpi_dev;
   74         device_t        dev;
   75 };
   76 
   77 static int
   78 fdc_acpi_probe(device_t dev)
   79 {
   80         device_t bus;
   81         static char *fdc_ids[] = { "PNP0700", "PNP0701", NULL };
   82 
   83         bus = device_get_parent(dev);
   84         if (ACPI_ID_PROBE(bus, dev, fdc_ids) == NULL)
   85                 return (ENXIO);
   86 
   87         if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL)))
   88                 device_set_desc(dev, "floppy drive controller (FDE)");
   89         else
   90                 device_set_desc(dev, "floppy drive controller");
   91         return (0);
   92 }
   93 
   94 static int
   95 fdc_acpi_attach(device_t dev)
   96 {
   97         struct fdc_data *sc;
   98         ACPI_BUFFER buf;
   99         ACPI_OBJECT *obj;
  100         device_t bus;
  101         int error;
  102 
  103         /* Get our softc and use the same accessor as ISA. */
  104         sc = device_get_softc(dev);
  105         sc->fdc_dev = dev;
  106 
  107         /* Initialize variables and get a temporary buffer for _FDE. */
  108         error = ENXIO;
  109         buf.Length = ACPI_FDC_BUFLEN;
  110         buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO);
  111         if (buf.Pointer == NULL)
  112                 goto out;
  113 
  114         /* Allocate resources the same as the ISA attachment. */
  115         error = fdc_isa_alloc_resources(dev, sc);
  116         if (error != 0)
  117                 goto out;
  118 
  119         /* Call common attach code in fdc(4) first. */
  120         error = fdc_attach(dev);
  121         if (error != 0)
  122                 goto out;
  123 
  124         /*
  125          * Enumerate _FDE, which lists floppy drives that are present.  If
  126          * this fails, fall back to the ISA hints-based probe method.
  127          */
  128         bus = device_get_parent(dev);
  129         if (ACPI_FAILURE(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) {
  130                 error = fdc_hints_probe(dev);
  131                 goto out;
  132         }
  133 
  134         /* Add fd child devices as specified. */
  135         obj = buf.Pointer;
  136         error = fdc_acpi_probe_children(bus, dev, obj->Buffer.Pointer);
  137 
  138 out:
  139         if (buf.Pointer)
  140                 free(buf.Pointer, M_TEMP);
  141         if (error != 0)
  142                 fdc_release_resources(sc);
  143 
  144         return (error);
  145 }
  146 
  147 static int
  148 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde)
  149 {
  150         struct fdc_walk_ctx *ctx;
  151         devclass_t fd_dc;
  152         int i;
  153 
  154         /* Setup the context and walk all child devices. */
  155         ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT);
  156         if (ctx == NULL) {
  157                 device_printf(dev, "no memory for walking children\n");
  158                 return (ENOMEM);
  159         }
  160         bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present));
  161         ctx->index = 0;
  162         ctx->dev = dev;
  163         ctx->acpi_dev = bus;
  164         ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child,
  165             ctx);
  166 
  167         /* Add any devices not represented by an AML Device handle/node. */
  168         fd_dc = devclass_find("fd");
  169         for (i = 0; i < ACPI_FDC_MAXDEVS; i++)
  170                 if (ctx->fd_present[i] == ACPI_FD_PRESENT &&
  171                     devclass_get_device(fd_dc, i) == NULL) {
  172                         if (fdc_add_child(dev, "fd", i) == NULL)
  173                                 device_printf(dev, "fd add failed\n");
  174                 }
  175         free(ctx, M_TEMP);
  176 
  177         /* Attach any children found during the probe. */
  178         return (bus_generic_attach(dev));
  179 }
  180 
  181 static ACPI_STATUS
  182 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg)
  183 {
  184         struct fdc_walk_ctx *ctx;
  185         device_t child, old_child;
  186         ACPI_BUFFER buf;
  187         ACPI_OBJECT *pkg, *obj;
  188         ACPI_STATUS status;
  189 
  190         ctx = (struct fdc_walk_ctx *)arg;
  191         buf.Pointer = NULL;
  192 
  193         /*
  194          * The first four ints are booleans that indicate whether fd0-3 are
  195          * present or not.  The last is for a tape device, which we don't
  196          * bother supporting for now.
  197          */
  198         if (ctx->index > 3)
  199                 return (AE_OK);
  200 
  201         /* This device is not present, move on to the next. */
  202         if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT)
  203                 goto out;
  204 
  205         /* Create a device for the child with the given index. */
  206         child = fdc_add_child(ctx->dev, "fd", ctx->index);
  207         if (child == NULL)
  208                 goto out;
  209         old_child = *dev;
  210         *dev = child;
  211 
  212         /* Get temporary buffer for _FDI probe. */
  213         buf.Length = ACPI_FDC_BUFLEN;
  214         buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO);
  215         if (buf.Pointer == NULL)
  216                 goto out;
  217 
  218         /*
  219          * Evaluate _FDI to get drive type to pass to the child.  We use the
  220          * old child here since it has a valid ACPI_HANDLE since it is a
  221          * child of acpi.  A better way to implement this would be to make fdc
  222          * support the ACPI handle ivar for its children.
  223          */
  224         status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL,
  225             &buf);
  226         if (ACPI_FAILURE(status)) {
  227                 if (status != AE_NOT_FOUND)
  228                         device_printf(ctx->dev, "_FDI failed - %#x\n", status);
  229                 goto out;
  230         }
  231         pkg = (ACPI_OBJECT *)buf.Pointer;
  232         if (!ACPI_PKG_VALID(pkg, 16)) {
  233                 device_printf(ctx->dev, "invalid _FDI package\n");
  234                 goto out;
  235         }
  236         obj = &pkg->Package.Elements[1];
  237         if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) {
  238                 device_printf(ctx->dev, "invalid type object in _FDI\n");
  239                 goto out;
  240         }
  241         fdc_set_fdtype(child, obj->Integer.Value);
  242 
  243 out:
  244         ctx->index++;
  245         if (buf.Pointer)
  246                 free(buf.Pointer, M_TEMP);
  247         return (AE_OK);
  248 }
  249 
  250 static device_method_t fdc_acpi_methods[] = {
  251         /* Device interface */
  252         DEVMETHOD(device_probe,         fdc_acpi_probe),
  253         DEVMETHOD(device_attach,        fdc_acpi_attach),
  254         DEVMETHOD(device_detach,        fdc_detach),
  255 
  256         /* Bus interface */
  257         DEVMETHOD(bus_print_child,      fdc_print_child),
  258         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
  259         DEVMETHOD(bus_write_ivar,       fdc_write_ivar),
  260 
  261         {0, 0}
  262 };
  263 
  264 static driver_t fdc_acpi_driver = {
  265         "fdc",
  266         fdc_acpi_methods,
  267         sizeof(struct fdc_data)
  268 };
  269 
  270 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0);

Cache object: d942021d65af159031b46cfa07216e27


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