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/8.0/sys/dev/fdc/fdc_acpi.c 193530 2009-06-05 18:44:36Z jkim $"); 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 device_t bus; 100 int error, fde_count, i; 101 ACPI_OBJECT *obj, *pkg; 102 uint32_t fde[ACPI_FDC_MAXDEVS]; 103 104 /* Get our softc and use the same accessor as ISA. */ 105 sc = device_get_softc(dev); 106 sc->fdc_dev = dev; 107 108 /* Initialize variables and get a temporary buffer for _FDE. */ 109 error = ENXIO; 110 buf.Length = ACPI_FDC_BUFLEN; 111 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 112 if (buf.Pointer == NULL) 113 goto out; 114 115 /* Allocate resources the same as the ISA attachment. */ 116 error = fdc_isa_alloc_resources(dev, sc); 117 if (error != 0) 118 goto out; 119 120 /* Call common attach code in fdc(4) first. */ 121 error = fdc_attach(dev); 122 if (error != 0) 123 goto out; 124 125 /* 126 * Enumerate _FDE, which lists floppy drives that are present. If 127 * this fails, fall back to the ISA hints-based probe method. 128 */ 129 bus = device_get_parent(dev); 130 if (ACPI_FAILURE(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) { 131 error = ENXIO; 132 goto out_hintsprobe; 133 } 134 135 /* Parse the output of _FDE in various ways. */ 136 obj = pkg = (ACPI_OBJECT *)buf.Pointer; 137 switch (obj->Type) { 138 case ACPI_TYPE_BUFFER: 139 /* 140 * The spec says _FDE should be a buffer of five 32-bit 141 * integers. In violation of the spec, some systems use 142 * five bytes instead. 143 */ 144 switch (obj->Buffer.Length) { 145 case ACPI_FDC_FDE_LEN: 146 bcopy(obj->Buffer.Pointer, fde, ACPI_FDC_FDE_LEN); 147 break; 148 case ACPI_FDC_MAXDEVS: 149 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 150 fde[i] = ((uint8_t *)obj->Buffer.Pointer)[i]; 151 break; 152 default: 153 device_printf(dev, "_FDE wrong length: %d\n", 154 obj->Buffer.Length); 155 error = ENXIO; 156 goto out_hintsprobe; 157 } 158 break; 159 case ACPI_TYPE_PACKAGE: 160 /* 161 * In violation of the spec, systems including the ASUS 162 * K8V return a package of five integers instead of a 163 * buffer of five 32-bit integers. 164 */ 165 fde_count = min(ACPI_FDC_MAXDEVS, pkg->Package.Count); 166 for (i = 0; i < fde_count; i++) { 167 obj = &pkg->Package.Elements[i]; 168 if (obj->Type == ACPI_TYPE_INTEGER) 169 fde[i] = (uint32_t)obj->Integer.Value; 170 } 171 break; 172 default: 173 device_printf(dev, "invalid _FDE type %d\n", obj->Type); 174 error = ENXIO; 175 goto out_hintsprobe; 176 } 177 178 /* Add fd child devices as specified. */ 179 error = fdc_acpi_probe_children(bus, dev, fde); 180 181 out_hintsprobe: 182 /* 183 * If there was a problem with the _FDE drive enumeration, fall 184 * back to the hints-based probe. 185 */ 186 if (error) 187 error = fdc_hints_probe(dev); 188 189 out: 190 if (buf.Pointer) 191 free(buf.Pointer, M_TEMP); 192 if (error != 0) 193 fdc_release_resources(sc); 194 195 return (error); 196 } 197 198 static int 199 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde) 200 { 201 struct fdc_walk_ctx *ctx; 202 devclass_t fd_dc; 203 int i; 204 205 /* Setup the context and walk all child devices. */ 206 ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT); 207 if (ctx == NULL) { 208 device_printf(dev, "no memory for walking children\n"); 209 return (ENOMEM); 210 } 211 bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present)); 212 ctx->index = 0; 213 ctx->dev = dev; 214 ctx->acpi_dev = bus; 215 ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child, 216 ctx); 217 218 /* Add any devices not represented by an AML Device handle/node. */ 219 fd_dc = devclass_find("fd"); 220 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 221 if (ctx->fd_present[i] == ACPI_FD_PRESENT && 222 devclass_get_device(fd_dc, i) == NULL) { 223 if (fdc_add_child(dev, "fd", i) == NULL) 224 device_printf(dev, "fd add failed\n"); 225 } 226 free(ctx, M_TEMP); 227 228 /* Attach any children found during the probe. */ 229 return (bus_generic_attach(dev)); 230 } 231 232 static ACPI_STATUS 233 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) 234 { 235 struct fdc_walk_ctx *ctx; 236 device_t child, old_child; 237 ACPI_BUFFER buf; 238 ACPI_OBJECT *pkg, *obj; 239 ACPI_STATUS status; 240 241 ctx = (struct fdc_walk_ctx *)arg; 242 buf.Pointer = NULL; 243 244 /* 245 * The first four ints are booleans that indicate whether fd0-3 are 246 * present or not. The last is for a tape device, which we don't 247 * bother supporting for now. 248 */ 249 if (ctx->index > 3) 250 return (AE_OK); 251 252 /* This device is not present, move on to the next. */ 253 if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) 254 goto out; 255 256 /* Create a device for the child with the given index. */ 257 child = fdc_add_child(ctx->dev, "fd", ctx->index); 258 if (child == NULL) 259 goto out; 260 old_child = *dev; 261 *dev = child; 262 263 /* Get temporary buffer for _FDI probe. */ 264 buf.Length = ACPI_FDC_BUFLEN; 265 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 266 if (buf.Pointer == NULL) 267 goto out; 268 269 /* 270 * Evaluate _FDI to get drive type to pass to the child. We use the 271 * old child here since it has a valid ACPI_HANDLE since it is a 272 * child of acpi. A better way to implement this would be to make fdc 273 * support the ACPI handle ivar for its children. 274 */ 275 status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL, 276 &buf); 277 if (ACPI_FAILURE(status)) { 278 if (status != AE_NOT_FOUND) 279 device_printf(ctx->dev, "_FDI failed - %#x\n", status); 280 goto out; 281 } 282 pkg = (ACPI_OBJECT *)buf.Pointer; 283 if (!ACPI_PKG_VALID(pkg, 16)) { 284 device_printf(ctx->dev, "invalid _FDI package\n"); 285 goto out; 286 } 287 obj = &pkg->Package.Elements[1]; 288 if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { 289 device_printf(ctx->dev, "invalid type object in _FDI\n"); 290 goto out; 291 } 292 fdc_set_fdtype(child, obj->Integer.Value); 293 294 out: 295 ctx->index++; 296 if (buf.Pointer) 297 free(buf.Pointer, M_TEMP); 298 return (AE_OK); 299 } 300 301 static device_method_t fdc_acpi_methods[] = { 302 /* Device interface */ 303 DEVMETHOD(device_probe, fdc_acpi_probe), 304 DEVMETHOD(device_attach, fdc_acpi_attach), 305 DEVMETHOD(device_detach, fdc_detach), 306 307 /* Bus interface */ 308 DEVMETHOD(bus_print_child, fdc_print_child), 309 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 310 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 311 312 {0, 0} 313 }; 314 315 static driver_t fdc_acpi_driver = { 316 "fdc", 317 fdc_acpi_methods, 318 sizeof(struct fdc_data) 319 }; 320 321 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0);
Cache object: a16c7540bb802b5bc95caab4df094120
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