1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004 Nate Lawson (SDG) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/bio.h> 32 #include <sys/bus.h> 33 #include <sys/malloc.h> 34 #include <sys/module.h> 35 #include <sys/proc.h> 36 37 #include <contrib/dev/acpica/include/acpi.h> 38 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 int rv; 82 83 bus = device_get_parent(dev); 84 rv = ACPI_ID_PROBE(bus, dev, fdc_ids, NULL); 85 if (rv > 0) 86 return (rv); 87 88 if (ACPI_SUCCESS(ACPI_EVALUATE_OBJECT(bus, dev, "_FDE", NULL, NULL))) 89 device_set_desc(dev, "floppy drive controller (FDE)"); 90 else 91 device_set_desc(dev, "floppy drive controller"); 92 return (rv); 93 } 94 95 static int 96 fdc_acpi_attach(device_t dev) 97 { 98 struct fdc_data *sc; 99 ACPI_BUFFER buf; 100 ACPI_OBJECT *obj; 101 device_t bus; 102 int error; 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 = fdc_hints_probe(dev); 132 goto out; 133 } 134 135 /* Add fd child devices as specified. */ 136 obj = buf.Pointer; 137 error = fdc_acpi_probe_children(bus, dev, obj->Buffer.Pointer); 138 139 out: 140 if (buf.Pointer) 141 free(buf.Pointer, M_TEMP); 142 if (error != 0) 143 fdc_release_resources(sc); 144 else 145 fdc_start_worker(dev); 146 147 return (error); 148 } 149 150 static int 151 fdc_acpi_probe_children(device_t bus, device_t dev, void *fde) 152 { 153 struct fdc_walk_ctx *ctx; 154 devclass_t fd_dc; 155 int i; 156 157 /* Setup the context and walk all child devices. */ 158 ctx = malloc(sizeof(struct fdc_walk_ctx), M_TEMP, M_NOWAIT); 159 if (ctx == NULL) { 160 device_printf(dev, "no memory for walking children\n"); 161 return (ENOMEM); 162 } 163 bcopy(fde, ctx->fd_present, sizeof(ctx->fd_present)); 164 ctx->index = 0; 165 ctx->dev = dev; 166 ctx->acpi_dev = bus; 167 ACPI_SCAN_CHILDREN(ctx->acpi_dev, dev, 1, fdc_acpi_probe_child, 168 ctx); 169 170 /* Add any devices not represented by an AML Device handle/node. */ 171 fd_dc = devclass_find("fd"); 172 for (i = 0; i < ACPI_FDC_MAXDEVS; i++) 173 if (ctx->fd_present[i] == ACPI_FD_PRESENT && 174 devclass_get_device(fd_dc, i) == NULL) { 175 if (fdc_add_child(dev, "fd", i) == NULL) 176 device_printf(dev, "fd add failed\n"); 177 } 178 free(ctx, M_TEMP); 179 180 /* Attach any children found during the probe. */ 181 return (bus_generic_attach(dev)); 182 } 183 184 static ACPI_STATUS 185 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) 186 { 187 struct fdc_walk_ctx *ctx; 188 device_t child, old_child; 189 ACPI_BUFFER buf; 190 ACPI_OBJECT *pkg, *obj; 191 ACPI_STATUS status; 192 193 ctx = (struct fdc_walk_ctx *)arg; 194 buf.Pointer = NULL; 195 196 /* 197 * The first four ints are booleans that indicate whether fd0-3 are 198 * present or not. The last is for a tape device, which we don't 199 * bother supporting for now. 200 */ 201 if (ctx->index > 3) 202 return (AE_OK); 203 204 /* This device is not present, move on to the next. */ 205 if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) 206 goto out; 207 208 /* Create a device for the child with the given index. */ 209 child = fdc_add_child(ctx->dev, "fd", ctx->index); 210 if (child == NULL) 211 goto out; 212 old_child = *dev; 213 *dev = child; 214 215 /* Get temporary buffer for _FDI probe. */ 216 buf.Length = ACPI_FDC_BUFLEN; 217 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 218 if (buf.Pointer == NULL) 219 goto out; 220 221 /* 222 * Evaluate _FDI to get drive type to pass to the child. We use the 223 * old child here since it has a valid ACPI_HANDLE since it is a 224 * child of acpi. A better way to implement this would be to make fdc 225 * support the ACPI handle ivar for its children. 226 */ 227 status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL, 228 &buf); 229 if (ACPI_FAILURE(status)) { 230 if (status != AE_NOT_FOUND) 231 device_printf(ctx->dev, "_FDI failed - %#x\n", status); 232 goto out; 233 } 234 pkg = (ACPI_OBJECT *)buf.Pointer; 235 if (!ACPI_PKG_VALID(pkg, 16)) { 236 device_printf(ctx->dev, "invalid _FDI package\n"); 237 goto out; 238 } 239 obj = &pkg->Package.Elements[1]; 240 if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { 241 device_printf(ctx->dev, "invalid type object in _FDI\n"); 242 goto out; 243 } 244 fdc_set_fdtype(child, obj->Integer.Value); 245 246 out: 247 ctx->index++; 248 if (buf.Pointer) 249 free(buf.Pointer, M_TEMP); 250 return (AE_OK); 251 } 252 253 static device_method_t fdc_acpi_methods[] = { 254 /* Device interface */ 255 DEVMETHOD(device_probe, fdc_acpi_probe), 256 DEVMETHOD(device_attach, fdc_acpi_attach), 257 DEVMETHOD(device_detach, fdc_detach), 258 259 /* Bus interface */ 260 DEVMETHOD(bus_print_child, fdc_print_child), 261 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 262 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 263 264 DEVMETHOD_END 265 }; 266 267 static driver_t fdc_acpi_driver = { 268 "fdc", 269 fdc_acpi_methods, 270 sizeof(struct fdc_data) 271 }; 272 273 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, 0, 0); 274