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