FreeBSD/Linux Kernel Cross Reference
sys/dev/fdc/fdc_acpi.c
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("$FreeBSD$");
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, 0, 0);
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