fdc_acpi.c revision 135288
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 135288 2004-09-16 01:51:21Z 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/* 53 * Parameters for the tape drive (5th device). Some BIOS authors use this 54 * for all drives, not just the tape drive (e.g., ASUS K8V). This isn't 55 * grossly incompatible with the spec since it says the first four devices 56 * are simple booleans. 57 */ 58#define ACPI_FD_UNKNOWN 0 59#define ACPI_FD_PRESENT 1 60#define ACPI_FD_NEVER_PRESENT 2 61 62/* Temporary buf length for evaluating _FDE and _FDI. */ 63#define ACPI_FDC_BUFLEN 1024 64 65/* Context for walking FDC child devices. */ 66struct fdc_walk_ctx { 67 uint32_t fd_present[ACPI_FDC_MAXDEVS]; 68 int index; 69 device_t acpi_dev; 70 device_t dev; 71}; 72 73static int 74fdc_acpi_probe(device_t dev) 75{ 76 device_t bus; 77 static char *fdc_ids[] = { "PNP0700", "PNP0701", NULL }; 78 79 bus = device_get_parent(dev); 80 if (ACPI_ID_PROBE(bus, dev, fdc_ids) == NULL) 81 return (ENXIO); 82 83 if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL))) 84 device_set_desc(dev, "floppy drive controller (FDE)"); 85 else 86 device_set_desc(dev, "floppy drive controller"); 87 return (0); 88} 89 90static int 91fdc_acpi_attach(device_t dev) 92{ 93 struct fdc_data *sc; 94 ACPI_BUFFER buf; 95 device_t bus; 96 int error, i; 97 ACPI_OBJECT *obj, *pkg; 98 ACPI_HANDLE h; 99 uint32_t *fde; 100 101 /* Get our softc and use the same accessor as ISA. */ 102 sc = device_get_softc(dev); 103 sc->fdc_dev = dev; 104 sc->flags |= FDC_ISPNP; 105 106 /* Initialize variables and get a temporary buffer for _FDE. */ 107 error = ENXIO; 108 h = acpi_get_handle(dev); 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_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) { 130 obj = pkg = (ACPI_OBJECT *)buf.Pointer; 131 switch (obj->Type) { 132 case ACPI_TYPE_BUFFER: 133 /* 134 * The spec says _FDE should be a buffer of five 135 * 32-bit integers. 136 */ 137 fde = (uint32_t *)obj->Buffer.Pointer; 138 if (obj->Buffer.Length < 20) { 139 device_printf(dev, "_FDE too small\n"); 140 goto out; 141 } 142 break; 143 case ACPI_TYPE_PACKAGE: 144 /* 145 * In violation of the spec, systems including the ASUS 146 * K8V return a package of five integers instead of a 147 * buffer of five 32-bit integers. 148 */ 149 fde = malloc(pkg->Package.Count * sizeof(uint32_t), 150 M_TEMP, M_NOWAIT | M_ZERO); 151 if (fde == NULL) { 152 goto out; 153 } 154 for (i = 0; i < pkg->Package.Count; i++) { 155 obj = &pkg->Package.Elements[i]; 156 if (obj->Type == ACPI_TYPE_INTEGER) 157 fde[i] = (uint32_t)obj->Integer.Value; 158 } 159 break; 160 default: 161 device_printf(dev, "invalid _FDE type %d\n", obj->Type); 162 error = ENXIO; 163 goto out; 164 } 165 error = fdc_acpi_probe_children(bus, dev, fde); 166 if (pkg->Type == ACPI_TYPE_PACKAGE) 167 free(fde, M_TEMP); 168 } else 169 error = fdc_hints_probe(dev); 170 171out: 172 if (buf.Pointer) 173 free(buf.Pointer, M_TEMP); 174 if (error != 0) 175 fdc_release_resources(sc); 176 177 return (error); 178} 179 180static int 181fdc_acpi_probe_children(device_t bus, device_t dev, void *fde) 182{ 183 struct fdc_walk_ctx *ctx; 184 devclass_t fd_dc; 185 int i; 186 187 /* Setup the context and walk all child devices. */ 188 ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT); 189 if (ctx == NULL) { 190 device_printf(dev, "no memory for walking children\n"); 191 return (ENOMEM); 192 } 193 bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present)); 194 ctx->index = 0; 195 ctx->dev = dev; 196 ctx->acpi_dev = bus; 197 ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child, 198 ctx); 199 200 /* Add any devices not represented by an AML Device handle/node. */ 201 fd_dc = devclass_find("fd"); 202 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 203 if (ctx->fd_present[i] == ACPI_FD_PRESENT && 204 devclass_get_device(fd_dc, i) == NULL) { 205 if (fdc_add_child(dev, "fd", i) == NULL) 206 device_printf(dev, "fd add failed\n"); 207 } 208 free(ctx, M_TEMP); 209 210 /* Attach any children found during the probe. */ 211 return (bus_generic_attach(dev)); 212} 213 214static ACPI_STATUS 215fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) 216{ 217 struct fdc_walk_ctx *ctx; 218 device_t child, old_child; 219 ACPI_BUFFER buf; 220 ACPI_OBJECT *pkg, *obj; 221 ACPI_STATUS status; 222 223 ctx = (struct fdc_walk_ctx *)arg; 224 buf.Pointer = NULL; 225 226 /* 227 * The first four ints are booleans that indicate whether fd0-3 are 228 * present or not. The last is for a tape device, which we don't 229 * bother supporting for now. 230 */ 231 if (ctx->index > 3) 232 return (AE_OK); 233 234 /* This device is not present, move on to the next. */ 235 if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) 236 goto out; 237 238 /* Create a device for the child with the given index. */ 239 child = fdc_add_child(ctx->dev, "fd", ctx->index); 240 if (child == NULL) 241 goto out; 242 old_child = *dev; 243 *dev = child; 244 245 /* Get temporary buffer for _FDI probe. */ 246 buf.Length = ACPI_FDC_BUFLEN; 247 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 248 if (buf.Pointer == NULL) 249 goto out; 250 251 /* 252 * Evaluate _FDI to get drive type to pass to the child. We use the 253 * old child here since it has a valid ACPI_HANDLE since it is a 254 * child of acpi. A better way to implement this would be to make fdc 255 * support the ACPI handle ivar for its children. 256 */ 257 status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL, 258 &buf); 259 if (ACPI_FAILURE(status)) { 260 if (status != AE_NOT_FOUND) 261 device_printf(ctx->dev, "_FDI failed - %#x\n", status); 262 goto out; 263 } 264 pkg = (ACPI_OBJECT *)buf.Pointer; 265 if (!ACPI_PKG_VALID(pkg, 16)) { 266 device_printf(ctx->dev, "invalid _FDI package\n"); 267 goto out; 268 } 269 obj = &pkg->Package.Elements[1]; 270 if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { 271 device_printf(ctx->dev, "invalid type object in _FDI\n"); 272 goto out; 273 } 274 fdc_set_fdtype(child, obj->Integer.Value); 275 276out: 277 ctx->index++; 278 if (buf.Pointer) 279 free(buf.Pointer, M_TEMP); 280 return (AE_OK); 281} 282 283static device_method_t fdc_acpi_methods[] = { 284 /* Device interface */ 285 DEVMETHOD(device_probe, fdc_acpi_probe), 286 DEVMETHOD(device_attach, fdc_acpi_attach), 287 DEVMETHOD(device_detach, fdc_detach), 288 289 /* Bus interface */ 290 DEVMETHOD(bus_print_child, fdc_print_child), 291 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 292 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 293 294 {0, 0} 295}; 296 297static driver_t fdc_acpi_driver = { 298 "fdc", 299 fdc_acpi_methods, 300 sizeof(struct fdc_data) 301}; 302 303DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0); 304