FreeBSD/Linux Kernel Cross Reference
sys/dev/fdc/fdc_acpi.c
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("$FreeBSD$");
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 DEVMETHOD_END
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: f2afe5240bf8e226056c8d0c42ca4906
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