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 "acpi.h" 39 #include <dev/acpica/acpivar.h> 40 #include <dev/fdc/fdcreg.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 static void fdctl_wr_acpi(fdc_p fdc, u_int8_t v); 50 51 /* Maximum number of child devices of a controller (4 floppy + 1 tape.) */ 52 #define ACPI_FDC_MAXDEVS 5 53 54 /* 55 * Parameters for the tape drive (5th device). Some BIOS authors use this 56 * for all drives, not just the tape drive (e.g., ASUS K8V). This isn't 57 * grossly incompatible with the spec since it says the first four devices 58 * are simple booleans. 59 */ 60 #define ACPI_FD_UNKNOWN 0 61 #define ACPI_FD_PRESENT 1 62 #define ACPI_FD_NEVER_PRESENT 2 63 64 /* Temporary buf length for evaluating _FDE and _FDI. */ 65 #define ACPI_FDC_BUFLEN 1024 66 67 /* Context for walking FDC child devices. */ 68 struct fdc_walk_ctx { 69 uint32_t fd_present[ACPI_FDC_MAXDEVS]; 70 int index; 71 device_t acpi_dev; 72 device_t dev; 73 }; 74 75 static void 76 fdctl_wr_acpi(fdc_p fdc, u_int8_t v) 77 { 78 bus_space_write_1(fdc->ctlt, fdc->ctlh, 0, v); 79 } 80 81 static int 82 fdc_acpi_probe(device_t dev) 83 { 84 device_t bus; 85 static char *fdc_ids[] = { "PNP0700", "PNP0701", NULL }; 86 87 bus = device_get_parent(dev); 88 if (ACPI_ID_PROBE(bus, dev, fdc_ids) == NULL) 89 return (ENXIO); 90 91 if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL))) 92 device_set_desc(dev, "floppy drive controller (FDE)"); 93 else 94 device_set_desc(dev, "floppy drive controller"); 95 return (0); 96 } 97 98 static int 99 fdc_acpi_attach(device_t dev) 100 { 101 struct fdc_data *sc; 102 ACPI_BUFFER buf; 103 device_t bus; 104 int error, i, ic_type; 105 ACPI_OBJECT *obj, *pkg; 106 ACPI_HANDLE h; 107 uint32_t *fde; 108 109 /* Get our softc and use the same accessor as ISA. */ 110 sc = device_get_softc(dev); 111 sc->fdc_dev = dev; 112 sc->fdctl_wr = fdctl_wr_acpi; 113 sc->flags |= FDC_ISPNP; 114 115 /* Initialize variables and get a temporary buffer for _FDE. */ 116 error = ENXIO; 117 h = acpi_get_handle(dev); 118 buf.Length = ACPI_FDC_BUFLEN; 119 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 120 if (buf.Pointer == NULL) 121 goto out; 122 123 /* Allocate resources the same as the ISA attachment. */ 124 error = fdc_isa_alloc_resources(dev, sc); 125 if (error != 0) 126 goto out; 127 128 /* Call common attach code in fdc(4) first. */ 129 error = fdc_attach(dev); 130 if (error != 0) 131 goto out; 132 133 /* Check that the controller is working and get its type. */ 134 error = fdc_initial_reset(sc); 135 if (error) 136 goto out; 137 if (fd_cmd(sc, 1, NE7CMD_VERSION, 1, &ic_type) == 0) { 138 ic_type = (u_char)ic_type; 139 switch (ic_type) { 140 case 0x80: 141 sc->fdct = FDC_NE765; 142 break; 143 case 0x81: /* not mentioned in any hardware doc */ 144 case 0x90: 145 sc->fdct = FDC_ENHANCED; 146 break; 147 default: 148 sc->fdct = FDC_UNKNOWN; 149 break; 150 } 151 } 152 153 /* 154 * Enumerate _FDE, which lists floppy drives that are present. If 155 * this fails, fall back to the ISA hints-based probe method. 156 */ 157 bus = device_get_parent(dev); 158 if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, &buf))) { 159 /* 160 * In violation of the spec, systems including the ASUS K8V 161 * return a package of five integers instead of a buffer of 162 * five 32-bit integers. 163 */ 164 fde = (uint32_t *)buf.Pointer; 165 pkg = (ACPI_OBJECT *)buf.Pointer; 166 if (pkg->Type == ACPI_TYPE_PACKAGE) { 167 fde = malloc(pkg->Package.Count * sizeof(uint32_t), 168 M_TEMP, M_NOWAIT | M_ZERO); 169 if (fde == NULL) { 170 error = ENOMEM; 171 goto out; 172 } 173 for (i = 0; i < pkg->Package.Count; i++) { 174 obj = &pkg->Package.Elements[i]; 175 if (obj->Type == ACPI_TYPE_INTEGER) 176 fde[i] = (uint32_t)obj->Integer.Value; 177 } 178 } 179 error = fdc_acpi_probe_children(bus, dev, fde); 180 if (pkg->Type == ACPI_TYPE_PACKAGE) 181 free(fde, M_TEMP); 182 } else 183 error = fdc_hints_probe(dev); 184 185 out: 186 if (buf.Pointer) 187 free(buf.Pointer, M_TEMP); 188 if (error != 0) 189 fdc_release_resources(sc); 190 191 return (error); 192 } 193 194 static int 195 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde) 196 { 197 struct fdc_walk_ctx *ctx; 198 devclass_t fd_dc; 199 int i; 200 201 /* Setup the context and walk all child devices. */ 202 ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT); 203 if (ctx == NULL) { 204 device_printf(dev, "no memory for walking children\n"); 205 return (ENOMEM); 206 } 207 bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present)); 208 ctx->index = 0; 209 ctx->dev = dev; 210 ctx->acpi_dev = bus; 211 ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child, 212 ctx); 213 214 /* Add any devices not represented by an AML Device handle/node. */ 215 fd_dc = devclass_find("fd"); 216 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 217 if (ctx->fd_present[i] == ACPI_FD_PRESENT && 218 devclass_get_device(fd_dc, i) == NULL) { 219 if (fdc_add_child(dev, "fd", i) == NULL) 220 device_printf(dev, "fd add failed\n"); 221 } 222 free(ctx, M_TEMP); 223 224 /* Attach any children found during the probe. */ 225 return (bus_generic_attach(dev)); 226 } 227 228 static ACPI_STATUS 229 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) 230 { 231 struct fdc_walk_ctx *ctx; 232 device_t child; 233 ACPI_BUFFER buf; 234 ACPI_OBJECT *pkg, *obj; 235 ACPI_STATUS status; 236 237 ctx = (struct fdc_walk_ctx *)arg; 238 buf.Pointer = NULL; 239 240 /* 241 * The first four ints are booleans that indicate whether fd0-3 are 242 * present or not. The last is for a tape device, which we don't 243 * bother supporting for now. 244 */ 245 if (ctx->index > 3) 246 return (AE_OK); 247 248 /* This device is not present, move on to the next. */ 249 if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) 250 goto out; 251 252 /* Create a device for the child with the given index. */ 253 child = fdc_add_child(ctx->dev, "fd", ctx->index); 254 if (child == NULL) 255 goto out; 256 *dev = child; 257 258 /* Get temporary buffer for _FDI probe. */ 259 buf.Length = ACPI_FDC_BUFLEN; 260 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 261 if (buf.Pointer == NULL) 262 goto out; 263 264 /* Evaluate _FDI to get drive type to pass to the child. */ 265 status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, *dev, "_FDI", NULL, &buf); 266 if (ACPI_FAILURE(status)) { 267 if (status != AE_NOT_FOUND) 268 device_printf(ctx->dev, "_FDI failed - %#x\n", status); 269 goto out; 270 } 271 pkg = (ACPI_OBJECT *)buf.Pointer; 272 if (!ACPI_PKG_VALID(pkg, 16)) { 273 device_printf(ctx->dev, "invalid _FDI package\n"); 274 goto out; 275 } 276 obj = &pkg->Package.Elements[1]; 277 if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { 278 device_printf(ctx->dev, "invalid type object in _FDI\n"); 279 goto out; 280 } 281 fdc_set_fdtype(child, obj->Integer.Value); 282 283 out: 284 ctx->index++; 285 if (buf.Pointer) 286 free(buf.Pointer, M_TEMP); 287 return (AE_OK); 288 } 289 290 static device_method_t fdc_acpi_methods[] = { 291 /* Device interface */ 292 DEVMETHOD(device_probe, fdc_acpi_probe), 293 DEVMETHOD(device_attach, fdc_acpi_attach), 294 DEVMETHOD(device_detach, fdc_detach), 295 296 /* Bus interface */ 297 DEVMETHOD(bus_print_child, fdc_print_child), 298 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 299 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 300 301 {0, 0} 302 }; 303 304 static driver_t fdc_acpi_driver = { 305 "fdc", 306 fdc_acpi_methods, 307 sizeof(struct fdc_data) 308 }; 309 310 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, fdc_devclass, 0, 0); 311