fdc_acpi.c revision 135392
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: head/sys/dev/fdc/fdc_acpi.c 135392 2004-09-17 18:50:38Z imp $"); 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 "acpi.h" 39#include <dev/acpica/acpivar.h> 40#include <dev/fdc/fdcvar.h> 41 42static int fdc_acpi_probe(device_t dev); 43static int fdc_acpi_attach(device_t dev); 44static int fdc_acpi_probe_children(device_t bus, device_t dev, 45 void *fde); 46static 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. */ 69struct 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 76static int 77fdc_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 93static int 94fdc_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 ACPI_HANDLE h; 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 h = acpi_get_handle(dev); 111 buf.Length = ACPI_FDC_BUFLEN; 112 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 113 if (buf.Pointer == NULL) 114 goto out; 115 116 /* Allocate resources the same as the ISA attachment. */ 117 error = fdc_isa_alloc_resources(dev, sc); 118 if (error != 0) 119 goto out; 120 121 /* Call common attach code in fdc(4) first. */ 122 error = fdc_attach(dev); 123 if (error != 0) 124 goto out; 125 126 /* 127 * Enumerate _FDE, which lists floppy drives that are present. If 128 * this fails, fall back to the ISA hints-based probe method. 129 */ 130 bus = device_get_parent(dev); 131 if (ACPI_FAILURE(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) { 132 error = ENXIO; 133 goto out; 134 } 135 136 /* Parse the output of _FDE in various ways. */ 137 obj = pkg = (ACPI_OBJECT *)buf.Pointer; 138 switch (obj->Type) { 139 case ACPI_TYPE_BUFFER: 140 /* 141 * The spec says _FDE should be a buffer of five 32-bit 142 * integers. In violation of the spec, some systems use 143 * five bytes instead. 144 */ 145 switch (obj->Buffer.Length) { 146 case ACPI_FDC_FDE_LEN: 147 bcopy(obj->Buffer.Pointer, fde, ACPI_FDC_FDE_LEN); 148 break; 149 case ACPI_FDC_MAXDEVS: 150 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 151 fde[i] = ((uint8_t *)obj->Buffer.Pointer)[i]; 152 break; 153 default: 154 device_printf(dev, "_FDE wrong length: %d\n", 155 obj->Buffer.Length); 156 error = ENXIO; 157 goto out; 158 } 159 break; 160 case ACPI_TYPE_PACKAGE: 161 /* 162 * In violation of the spec, systems including the ASUS 163 * K8V return a package of five integers instead of a 164 * buffer of five 32-bit integers. 165 */ 166 fde_count = min(ACPI_FDC_MAXDEVS, pkg->Package.Count); 167 for (i = 0; i < fde_count; i++) { 168 obj = &pkg->Package.Elements[i]; 169 if (obj->Type == ACPI_TYPE_INTEGER) 170 fde[i] = (uint32_t)obj->Integer.Value; 171 } 172 break; 173 default: 174 device_printf(dev, "invalid _FDE type %d\n", obj->Type); 175 error = ENXIO; 176 goto out; 177 } 178 179 /* Add fd child devices as specified. */ 180 error = fdc_acpi_probe_children(bus, dev, fde); 181 182out: 183 /* If there was a problem, fall back to the hints-based probe. */ 184 if (error) 185 error = fdc_hints_probe(dev); 186 187 if (buf.Pointer) 188 free(buf.Pointer, M_TEMP); 189 if (error != 0) 190 fdc_release_resources(sc); 191 192 return (error); 193} 194 195static int 196fdc_acpi_probe_children(device_t bus, device_t dev, void *fde) 197{ 198 struct fdc_walk_ctx *ctx; 199 devclass_t fd_dc; 200 int i; 201 202 /* Setup the context and walk all child devices. */ 203 ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT); 204 if (ctx == NULL) { 205 device_printf(dev, "no memory for walking children\n"); 206 return (ENOMEM); 207 } 208 bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present)); 209 ctx->index = 0; 210 ctx->dev = dev; 211 ctx->acpi_dev = bus; 212 ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child, 213 ctx); 214 215 /* Add any devices not represented by an AML Device handle/node. */ 216 fd_dc = devclass_find("fd"); 217 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 218 if (ctx->fd_present[i] == ACPI_FD_PRESENT && 219 devclass_get_device(fd_dc, i) == NULL) { 220 if (fdc_add_child(dev, "fd", i) == NULL) 221 device_printf(dev, "fd add failed\n"); 222 } 223 free(ctx, M_TEMP); 224 225 /* Attach any children found during the probe. */ 226 return (bus_generic_attach(dev)); 227} 228 229static ACPI_STATUS 230fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) 231{ 232 struct fdc_walk_ctx *ctx; 233 device_t child, old_child; 234 ACPI_BUFFER buf; 235 ACPI_OBJECT *pkg, *obj; 236 ACPI_STATUS status; 237 238 ctx = (struct fdc_walk_ctx *)arg; 239 buf.Pointer = NULL; 240 241 /* 242 * The first four ints are booleans that indicate whether fd0-3 are 243 * present or not. The last is for a tape device, which we don't 244 * bother supporting for now. 245 */ 246 if (ctx->index > 3) 247 return (AE_OK); 248 249 /* This device is not present, move on to the next. */ 250 if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) 251 goto out; 252 253 /* Create a device for the child with the given index. */ 254 child = fdc_add_child(ctx->dev, "fd", ctx->index); 255 if (child == NULL) 256 goto out; 257 old_child = *dev; 258 *dev = child; 259 260 /* Get temporary buffer for _FDI probe. */ 261 buf.Length = ACPI_FDC_BUFLEN; 262 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 263 if (buf.Pointer == NULL) 264 goto out; 265 266 /* 267 * Evaluate _FDI to get drive type to pass to the child. We use the 268 * old child here since it has a valid ACPI_HANDLE since it is a 269 * child of acpi. A better way to implement this would be to make fdc 270 * support the ACPI handle ivar for its children. 271 */ 272 status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL, 273 &buf); 274 if (ACPI_FAILURE(status)) { 275 if (status != AE_NOT_FOUND) 276 device_printf(ctx->dev, "_FDI failed - %#x\n", status); 277 goto out; 278 } 279 pkg = (ACPI_OBJECT *)buf.Pointer; 280 if (!ACPI_PKG_VALID(pkg, 16)) { 281 device_printf(ctx->dev, "invalid _FDI package\n"); 282 goto out; 283 } 284 obj = &pkg->Package.Elements[1]; 285 if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { 286 device_printf(ctx->dev, "invalid type object in _FDI\n"); 287 goto out; 288 } 289 fdc_set_fdtype(child, obj->Integer.Value); 290 291out: 292 ctx->index++; 293 if (buf.Pointer) 294 free(buf.Pointer, M_TEMP); 295 return (AE_OK); 296} 297 298static device_method_t fdc_acpi_methods[] = { 299 /* Device interface */ 300 DEVMETHOD(device_probe, fdc_acpi_probe), 301 DEVMETHOD(device_attach, fdc_acpi_attach), 302 DEVMETHOD(device_detach, fdc_detach), 303 304 /* Bus interface */ 305 DEVMETHOD(bus_print_child, fdc_print_child), 306 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 307 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 308 309 {0, 0} 310}; 311 312static driver_t fdc_acpi_driver = { 313 "fdc", 314 fdc_acpi_methods, 315 sizeof(struct fdc_data) 316}; 317 318DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0); 319