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/6.4/sys/dev/fdc/fdc_acpi.c 152152 2005-11-07 09:53:25Z obrien $");
   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/acpi.h>
   39 #include <dev/acpica/acpivar.h>
   40 #include <dev/fdc/fdcvar.h>
   41 
   42 static int              fdc_acpi_probe(device_t dev);
   43 static int              fdc_acpi_attach(device_t dev);
   44 static int              fdc_acpi_probe_children(device_t bus, device_t dev,
   45                             void *fde);
   46 static ACPI_STATUS      fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev,
   47                             int level, void *arg);
   48 
   49 /* Maximum number of child devices of a controller (4 floppy + 1 tape.) */
   50 #define ACPI_FDC_MAXDEVS        5
   51 
   52 /* Standard size of buffer returned by the _FDE method. */
   53 #define ACPI_FDC_FDE_LEN        (ACPI_FDC_MAXDEVS * sizeof(uint32_t))
   54 
   55 /*
   56  * Parameters for the tape drive (5th device).  Some BIOS authors use this
   57  * for all drives, not just the tape drive (e.g., ASUS K8V).  This isn't
   58  * grossly incompatible with the spec since it says the first four devices
   59  * are simple booleans.
   60  */
   61 #define ACPI_FD_UNKNOWN         0
   62 #define ACPI_FD_PRESENT         1
   63 #define ACPI_FD_NEVER_PRESENT   2
   64 
   65 /* Temporary buf length for evaluating _FDE and _FDI. */
   66 #define ACPI_FDC_BUFLEN         1024
   67 
   68 /* Context for walking FDC child devices. */
   69 struct fdc_walk_ctx {
   70         uint32_t        fd_present[ACPI_FDC_MAXDEVS];
   71         int             index;
   72         device_t        acpi_dev;
   73         device_t        dev;
   74 };
   75 
   76 static int
   77 fdc_acpi_probe(device_t dev)
   78 {
   79         device_t bus;
   80         static char *fdc_ids[] = { "PNP0700", "PNP0701", NULL };
   81 
   82         bus = device_get_parent(dev);
   83         if (ACPI_ID_PROBE(bus, dev, fdc_ids) == NULL)
   84                 return (ENXIO);
   85 
   86         if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL)))
   87                 device_set_desc(dev, "floppy drive controller (FDE)");
   88         else
   89                 device_set_desc(dev, "floppy drive controller");
   90         return (0);
   91 }
   92 
   93 static int
   94 fdc_acpi_attach(device_t dev)
   95 {
   96         struct fdc_data *sc;
   97         ACPI_BUFFER buf;
   98         device_t bus;
   99         int error, fde_count, i;
  100         ACPI_OBJECT *obj, *pkg;
  101         ACPI_HANDLE h;
  102         uint32_t fde[ACPI_FDC_MAXDEVS];
  103 
  104         /* Get our softc and use the same accessor as ISA. */
  105         sc = device_get_softc(dev);
  106         sc->fdc_dev = dev;
  107 
  108         /* Initialize variables and get a temporary buffer for _FDE. */
  109         error = ENXIO;
  110         h = acpi_get_handle(dev);
  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 = ENXIO;
  133                 goto out_hintsprobe;
  134         }
  135 
  136         /* Parse the output of _FDE in various ways. */
  137         obj = pkg = (ACPI_OBJECT *)buf.Pointer;
  138         switch (obj->Type) {
  139         case ACPI_TYPE_BUFFER:
  140                 /*
  141                  * The spec says _FDE should be a buffer of five 32-bit
  142                  * integers.  In violation of the spec, some systems use
  143                  * five bytes instead.
  144                  */
  145                 switch (obj->Buffer.Length) {
  146                 case ACPI_FDC_FDE_LEN:
  147                         bcopy(obj->Buffer.Pointer, fde, ACPI_FDC_FDE_LEN);
  148                         break;
  149                 case ACPI_FDC_MAXDEVS:
  150                         for (i = 0; i < ACPI_FDC_MAXDEVS; i++)
  151                                 fde[i] = ((uint8_t *)obj->Buffer.Pointer)[i];
  152                         break;
  153                 default:
  154                         device_printf(dev, "_FDE wrong length: %d\n",
  155                             obj->Buffer.Length);
  156                         error = ENXIO;
  157                         goto out_hintsprobe;
  158                 }
  159                 break;
  160         case ACPI_TYPE_PACKAGE:
  161                 /*
  162                  * In violation of the spec, systems including the ASUS
  163                  * K8V return a package of five integers instead of a
  164                  * buffer of five 32-bit integers.
  165                  */
  166                 fde_count = min(ACPI_FDC_MAXDEVS, pkg->Package.Count);
  167                 for (i = 0; i < fde_count; i++) {
  168                         obj = &pkg->Package.Elements[i];
  169                         if (obj->Type == ACPI_TYPE_INTEGER)
  170                                 fde[i] = (uint32_t)obj->Integer.Value;
  171                 }
  172                 break;
  173         default:
  174                 device_printf(dev, "invalid _FDE type %d\n", obj->Type);
  175                 error = ENXIO;
  176                 goto out_hintsprobe;
  177         }
  178 
  179         /* Add fd child devices as specified. */
  180         error = fdc_acpi_probe_children(bus, dev, fde);
  181 
  182 out_hintsprobe:
  183         /*
  184          * If there was a problem with the _FDE drive enumeration, fall
  185          * back to the hints-based probe.
  186          */
  187         if (error)
  188                 error = fdc_hints_probe(dev);
  189 
  190 out:
  191         if (buf.Pointer)
  192                 free(buf.Pointer, M_TEMP);
  193         if (error != 0)
  194                 fdc_release_resources(sc);
  195 
  196         return (error);
  197 }
  198 
  199 static int
  200 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde)
  201 {
  202         struct fdc_walk_ctx *ctx;
  203         devclass_t fd_dc;
  204         int i;
  205 
  206         /* Setup the context and walk all child devices. */
  207         ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT);
  208         if (ctx == NULL) {
  209                 device_printf(dev, "no memory for walking children\n");
  210                 return (ENOMEM);
  211         }
  212         bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present));
  213         ctx->index = 0;
  214         ctx->dev = dev;
  215         ctx->acpi_dev = bus;
  216         ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child,
  217             ctx);
  218 
  219         /* Add any devices not represented by an AML Device handle/node. */
  220         fd_dc = devclass_find("fd");
  221         for (i = 0; i < ACPI_FDC_MAXDEVS; i++)
  222                 if (ctx->fd_present[i] == ACPI_FD_PRESENT &&
  223                     devclass_get_device(fd_dc, i) == NULL) {
  224                         if (fdc_add_child(dev, "fd", i) == NULL)
  225                                 device_printf(dev, "fd add failed\n");
  226                 }
  227         free(ctx, M_TEMP);
  228 
  229         /* Attach any children found during the probe. */
  230         return (bus_generic_attach(dev));
  231 }
  232 
  233 static ACPI_STATUS
  234 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg)
  235 {
  236         struct fdc_walk_ctx *ctx;
  237         device_t child, old_child;
  238         ACPI_BUFFER buf;
  239         ACPI_OBJECT *pkg, *obj;
  240         ACPI_STATUS status;
  241 
  242         ctx = (struct fdc_walk_ctx *)arg;
  243         buf.Pointer = NULL;
  244 
  245         /*
  246          * The first four ints are booleans that indicate whether fd0-3 are
  247          * present or not.  The last is for a tape device, which we don't
  248          * bother supporting for now.
  249          */
  250         if (ctx->index > 3)
  251                 return (AE_OK);
  252 
  253         /* This device is not present, move on to the next. */
  254         if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT)
  255                 goto out;
  256 
  257         /* Create a device for the child with the given index. */
  258         child = fdc_add_child(ctx->dev, "fd", ctx->index);
  259         if (child == NULL)
  260                 goto out;
  261         old_child = *dev;
  262         *dev = child;
  263 
  264         /* Get temporary buffer for _FDI probe. */
  265         buf.Length = ACPI_FDC_BUFLEN;
  266         buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO);
  267         if (buf.Pointer == NULL)
  268                 goto out;
  269 
  270         /*
  271          * Evaluate _FDI to get drive type to pass to the child.  We use the
  272          * old child here since it has a valid ACPI_HANDLE since it is a
  273          * child of acpi.  A better way to implement this would be to make fdc
  274          * support the ACPI handle ivar for its children.
  275          */
  276         status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL,
  277             &buf);
  278         if (ACPI_FAILURE(status)) {
  279                 if (status != AE_NOT_FOUND)
  280                         device_printf(ctx->dev, "_FDI failed - %#x\n", status);
  281                 goto out;
  282         }
  283         pkg = (ACPI_OBJECT *)buf.Pointer;
  284         if (!ACPI_PKG_VALID(pkg, 16)) {
  285                 device_printf(ctx->dev, "invalid _FDI package\n");
  286                 goto out;
  287         }
  288         obj = &pkg->Package.Elements[1];
  289         if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) {
  290                 device_printf(ctx->dev, "invalid type object in _FDI\n");
  291                 goto out;
  292         }
  293         fdc_set_fdtype(child, obj->Integer.Value);
  294 
  295 out:
  296         ctx->index++;
  297         if (buf.Pointer)
  298                 free(buf.Pointer, M_TEMP);
  299         return (AE_OK);
  300 }
  301 
  302 static device_method_t fdc_acpi_methods[] = {
  303         /* Device interface */
  304         DEVMETHOD(device_probe,         fdc_acpi_probe),
  305         DEVMETHOD(device_attach,        fdc_acpi_attach),
  306         DEVMETHOD(device_detach,        fdc_detach),
  307 
  308         /* Bus interface */
  309         DEVMETHOD(bus_print_child,      fdc_print_child),
  310         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
  311         DEVMETHOD(bus_write_ivar,       fdc_write_ivar),
  312 
  313         {0, 0}
  314 };
  315 
  316 static driver_t fdc_acpi_driver = {
  317         "fdc",
  318         fdc_acpi_methods,
  319         sizeof(struct fdc_data)
  320 };
  321 
  322 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0);

Cache object: d7aa4ff76e6dd75deb972fd2f125ded3


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