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/7.3/sys/dev/fdc/fdc_acpi.c 155870 2006-02-21 03:19:24Z njl $"); 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 uint32_t fde[ACPI_FDC_MAXDEVS]; 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 = ENXIO; 131 goto out_hintsprobe; 132 } 133 134 /* Parse the output of _FDE in various ways. */ 135 obj = pkg = (ACPI_OBJECT *)buf.Pointer; 136 switch (obj->Type) { 137 case ACPI_TYPE_BUFFER: 138 /* 139 * The spec says _FDE should be a buffer of five 32-bit 140 * integers. In violation of the spec, some systems use 141 * five bytes instead. 142 */ 143 switch (obj->Buffer.Length) { 144 case ACPI_FDC_FDE_LEN: 145 bcopy(obj->Buffer.Pointer, fde, ACPI_FDC_FDE_LEN); 146 break; 147 case ACPI_FDC_MAXDEVS: 148 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 149 fde[i] = ((uint8_t *)obj->Buffer.Pointer)[i]; 150 break; 151 default: 152 device_printf(dev, "_FDE wrong length: %d\n", 153 obj->Buffer.Length); 154 error = ENXIO; 155 goto out_hintsprobe; 156 } 157 break; 158 case ACPI_TYPE_PACKAGE: 159 /* 160 * In violation of the spec, systems including the ASUS 161 * K8V return a package of five integers instead of a 162 * buffer of five 32-bit integers. 163 */ 164 fde_count = min(ACPI_FDC_MAXDEVS, pkg->Package.Count); 165 for (i = 0; i < fde_count; i++) { 166 obj = &pkg->Package.Elements[i]; 167 if (obj->Type == ACPI_TYPE_INTEGER) 168 fde[i] = (uint32_t)obj->Integer.Value; 169 } 170 break; 171 default: 172 device_printf(dev, "invalid _FDE type %d\n", obj->Type); 173 error = ENXIO; 174 goto out_hintsprobe; 175 } 176 177 /* Add fd child devices as specified. */ 178 error = fdc_acpi_probe_children(bus, dev, fde); 179 180 out_hintsprobe: 181 /* 182 * If there was a problem with the _FDE drive enumeration, fall 183 * back to the hints-based probe. 184 */ 185 if (error) 186 error = fdc_hints_probe(dev); 187 188 out: 189 if (buf.Pointer) 190 free(buf.Pointer, M_TEMP); 191 if (error != 0) 192 fdc_release_resources(sc); 193 194 return (error); 195 } 196 197 static int 198 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde) 199 { 200 struct fdc_walk_ctx *ctx; 201 devclass_t fd_dc; 202 int i; 203 204 /* Setup the context and walk all child devices. */ 205 ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT); 206 if (ctx == NULL) { 207 device_printf(dev, "no memory for walking children\n"); 208 return (ENOMEM); 209 } 210 bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present)); 211 ctx->index = 0; 212 ctx->dev = dev; 213 ctx->acpi_dev = bus; 214 ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child, 215 ctx); 216 217 /* Add any devices not represented by an AML Device handle/node. */ 218 fd_dc = devclass_find("fd"); 219 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 220 if (ctx->fd_present[i] == ACPI_FD_PRESENT && 221 devclass_get_device(fd_dc, i) == NULL) { 222 if (fdc_add_child(dev, "fd", i) == NULL) 223 device_printf(dev, "fd add failed\n"); 224 } 225 free(ctx, M_TEMP); 226 227 /* Attach any children found during the probe. */ 228 return (bus_generic_attach(dev)); 229 } 230 231 static ACPI_STATUS 232 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) 233 { 234 struct fdc_walk_ctx *ctx; 235 device_t child, old_child; 236 ACPI_BUFFER buf; 237 ACPI_OBJECT *pkg, *obj; 238 ACPI_STATUS status; 239 240 ctx = (struct fdc_walk_ctx *)arg; 241 buf.Pointer = NULL; 242 243 /* 244 * The first four ints are booleans that indicate whether fd0-3 are 245 * present or not. The last is for a tape device, which we don't 246 * bother supporting for now. 247 */ 248 if (ctx->index > 3) 249 return (AE_OK); 250 251 /* This device is not present, move on to the next. */ 252 if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) 253 goto out; 254 255 /* Create a device for the child with the given index. */ 256 child = fdc_add_child(ctx->dev, "fd", ctx->index); 257 if (child == NULL) 258 goto out; 259 old_child = *dev; 260 *dev = child; 261 262 /* Get temporary buffer for _FDI probe. */ 263 buf.Length = ACPI_FDC_BUFLEN; 264 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 265 if (buf.Pointer == NULL) 266 goto out; 267 268 /* 269 * Evaluate _FDI to get drive type to pass to the child. We use the 270 * old child here since it has a valid ACPI_HANDLE since it is a 271 * child of acpi. A better way to implement this would be to make fdc 272 * support the ACPI handle ivar for its children. 273 */ 274 status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL, 275 &buf); 276 if (ACPI_FAILURE(status)) { 277 if (status != AE_NOT_FOUND) 278 device_printf(ctx->dev, "_FDI failed - %#x\n", status); 279 goto out; 280 } 281 pkg = (ACPI_OBJECT *)buf.Pointer; 282 if (!ACPI_PKG_VALID(pkg, 16)) { 283 device_printf(ctx->dev, "invalid _FDI package\n"); 284 goto out; 285 } 286 obj = &pkg->Package.Elements[1]; 287 if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { 288 device_printf(ctx->dev, "invalid type object in _FDI\n"); 289 goto out; 290 } 291 fdc_set_fdtype(child, obj->Integer.Value); 292 293 out: 294 ctx->index++; 295 if (buf.Pointer) 296 free(buf.Pointer, M_TEMP); 297 return (AE_OK); 298 } 299 300 static device_method_t fdc_acpi_methods[] = { 301 /* Device interface */ 302 DEVMETHOD(device_probe, fdc_acpi_probe), 303 DEVMETHOD(device_attach, fdc_acpi_attach), 304 DEVMETHOD(device_detach, fdc_detach), 305 306 /* Bus interface */ 307 DEVMETHOD(bus_print_child, fdc_print_child), 308 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 309 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 310 311 {0, 0} 312 }; 313 314 static driver_t fdc_acpi_driver = { 315 "fdc", 316 fdc_acpi_methods, 317 sizeof(struct fdc_data) 318 }; 319 320 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0);
Cache object: 3f63abacc40613f9b5dc6f15204b9b62
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