/*- * Copyright (c) 2004 Nate Lawson (SDG) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include "acpi.h" #include #include static int fdc_acpi_probe(device_t dev); static int fdc_acpi_attach(device_t dev); static int fdc_acpi_probe_children(device_t bus, device_t dev, void *fde); static ACPI_STATUS fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg); /* Maximum number of child devices of a controller (4 floppy + 1 tape.) */ #define ACPI_FDC_MAXDEVS 5 /* * Parameters for the tape drive (5th device). Some BIOS authors use this * for all drives, not just the tape drive (e.g., ASUS K8V). This isn't * grossly incompatible with the spec since it says the first four devices * are simple booleans. */ #define ACPI_FD_UNKNOWN 0 #define ACPI_FD_PRESENT 1 #define ACPI_FD_NEVER_PRESENT 2 /* Temporary buf length for evaluating _FDE and _FDI. */ #define ACPI_FDC_BUFLEN 1024 /* Context for walking FDC child devices. */ struct fdc_walk_ctx { uint32_t fd_present[ACPI_FDC_MAXDEVS]; int index; device_t acpi_dev; device_t dev; }; static int fdc_acpi_probe(device_t dev) { device_t bus; static char *fdc_ids[] = { "PNP0700", "PNP0701", NULL }; bus = device_get_parent(dev); if (ACPI_ID_PROBE(bus, dev, fdc_ids) == NULL) return (ENXIO); if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL))) device_set_desc(dev, "floppy drive controller (FDE)"); else device_set_desc(dev, "floppy drive controller"); return (0); } static int fdc_acpi_attach(device_t dev) { struct fdc_data *sc; ACPI_BUFFER buf; device_t bus; int error, i; ACPI_OBJECT *obj, *pkg; ACPI_HANDLE h; uint32_t *fde; /* Get our softc and use the same accessor as ISA. */ sc = device_get_softc(dev); sc->fdc_dev = dev; sc->flags |= FDC_ISPNP; /* Initialize variables and get a temporary buffer for _FDE. */ error = ENXIO; h = acpi_get_handle(dev); buf.Length = ACPI_FDC_BUFLEN; buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); if (buf.Pointer == NULL) goto out; /* Allocate resources the same as the ISA attachment. */ error = fdc_isa_alloc_resources(dev, sc); if (error != 0) goto out; /* Call common attach code in fdc(4) first. */ error = fdc_attach(dev); if (error != 0) goto out; /* * Enumerate _FDE, which lists floppy drives that are present. If * this fails, fall back to the ISA hints-based probe method. */ bus = device_get_parent(dev); if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) { obj = pkg = (ACPI_OBJECT *)buf.Pointer; switch (obj->Type) { case ACPI_TYPE_BUFFER: /* * The spec says _FDE should be a buffer of five * 32-bit integers. */ fde = (uint32_t *)obj->Buffer.Pointer; if (obj->Buffer.Length < 20) { device_printf(dev, "_FDE too small\n"); goto out; } break; case ACPI_TYPE_PACKAGE: /* * In violation of the spec, systems including the ASUS * K8V return a package of five integers instead of a * buffer of five 32-bit integers. */ fde = malloc(pkg->Package.Count * sizeof(uint32_t), M_TEMP, M_NOWAIT | M_ZERO); if (fde == NULL) { goto out; } for (i = 0; i < pkg->Package.Count; i++) { obj = &pkg->Package.Elements[i]; if (obj->Type == ACPI_TYPE_INTEGER) fde[i] = (uint32_t)obj->Integer.Value; } break; default: device_printf(dev, "invalid _FDE type %d\n", obj->Type); goto out; } error = fdc_acpi_probe_children(bus, dev, fde); if (pkg->Type == ACPI_TYPE_PACKAGE) free(fde, M_TEMP); } else error = fdc_hints_probe(dev); out: if (buf.Pointer) free(buf.Pointer, M_TEMP); if (error != 0) fdc_release_resources(sc); return (error); } static int fdc_acpi_probe_children(device_t bus, device_t dev, void *fde) { struct fdc_walk_ctx *ctx; devclass_t fd_dc; int i; /* Setup the context and walk all child devices. */ ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT); if (ctx == NULL) { device_printf(dev, "no memory for walking children\n"); return (ENOMEM); } bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present)); ctx->index = 0; ctx->dev = dev; ctx->acpi_dev = bus; ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child, ctx); /* Add any devices not represented by an AML Device handle/node. */ fd_dc = devclass_find("fd"); for (i = 0; i < ACPI_FDC_MAXDEVS; i++) if (ctx->fd_present[i] == ACPI_FD_PRESENT && devclass_get_device(fd_dc, i) == NULL) { if (fdc_add_child(dev, "fd", i) == NULL) device_printf(dev, "fd add failed\n"); } free(ctx, M_TEMP); /* Attach any children found during the probe. */ return (bus_generic_attach(dev)); } static ACPI_STATUS fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) { struct fdc_walk_ctx *ctx; device_t child, old_child; ACPI_BUFFER buf; ACPI_OBJECT *pkg, *obj; ACPI_STATUS status; ctx = (struct fdc_walk_ctx *)arg; buf.Pointer = NULL; /* * The first four ints are booleans that indicate whether fd0-3 are * present or not. The last is for a tape device, which we don't * bother supporting for now. */ if (ctx->index > 3) return (AE_OK); /* This device is not present, move on to the next. */ if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) goto out; /* Create a device for the child with the given index. */ child = fdc_add_child(ctx->dev, "fd", ctx->index); if (child == NULL) goto out; old_child = *dev; *dev = child; /* Get temporary buffer for _FDI probe. */ buf.Length = ACPI_FDC_BUFLEN; buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); if (buf.Pointer == NULL) goto out; /* * Evaluate _FDI to get drive type to pass to the child. We use the * old child here since it has a valid ACPI_HANDLE since it is a * child of acpi. A better way to implement this would be to make fdc * support the ACPI handle ivar for its children. */ status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL, &buf); if (ACPI_FAILURE(status)) { if (status != AE_NOT_FOUND) device_printf(ctx->dev, "_FDI failed - %#x\n", status); goto out; } pkg = (ACPI_OBJECT *)buf.Pointer; if (!ACPI_PKG_VALID(pkg, 16)) { device_printf(ctx->dev, "invalid _FDI package\n"); goto out; } obj = &pkg->Package.Elements[1]; if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { device_printf(ctx->dev, "invalid type object in _FDI\n"); goto out; } fdc_set_fdtype(child, obj->Integer.Value); out: ctx->index++; if (buf.Pointer) free(buf.Pointer, M_TEMP); return (AE_OK); } static device_method_t fdc_acpi_methods[] = { /* Device interface */ DEVMETHOD(device_probe, fdc_acpi_probe), DEVMETHOD(device_attach, fdc_acpi_attach), DEVMETHOD(device_detach, fdc_detach), /* Bus interface */ DEVMETHOD(bus_print_child, fdc_print_child), DEVMETHOD(bus_read_ivar, fdc_read_ivar), DEVMETHOD(bus_write_ivar, fdc_write_ivar), {0, 0} }; static driver_t fdc_acpi_driver = { "fdc", fdc_acpi_methods, sizeof(struct fdc_data) }; DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0);