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 bus_attach_children(dev); 182 return (0); 183 } 184 185 static ACPI_STATUS 186 fdc_acpi_probe_child(ACPI_HANDLE h, device_t *dev, int level, void *arg) 187 { 188 struct fdc_walk_ctx *ctx; 189 device_t child, old_child; 190 ACPI_BUFFER buf; 191 ACPI_OBJECT *pkg, *obj; 192 ACPI_STATUS status; 193 194 ctx = (struct fdc_walk_ctx *)arg; 195 buf.Pointer = NULL; 196 197 /* 198 * The first four ints are booleans that indicate whether fd0-3 are 199 * present or not. The last is for a tape device, which we don't 200 * bother supporting for now. 201 */ 202 if (ctx->index > 3) 203 return (AE_OK); 204 205 /* This device is not present, move on to the next. */ 206 if (ctx->fd_present[ctx->index] != ACPI_FD_PRESENT) 207 goto out; 208 209 /* Create a device for the child with the given index. */ 210 child = fdc_add_child(ctx->dev, "fd", ctx->index); 211 if (child == NULL) 212 goto out; 213 old_child = *dev; 214 *dev = child; 215 216 /* Get temporary buffer for _FDI probe. */ 217 buf.Length = ACPI_FDC_BUFLEN; 218 buf.Pointer = malloc(buf.Length, M_TEMP, M_NOWAIT | M_ZERO); 219 if (buf.Pointer == NULL) 220 goto out; 221 222 /* 223 * Evaluate _FDI to get drive type to pass to the child. We use the 224 * old child here since it has a valid ACPI_HANDLE since it is a 225 * child of acpi. A better way to implement this would be to make fdc 226 * support the ACPI handle ivar for its children. 227 */ 228 status = ACPI_EVALUATE_OBJECT(ctx->acpi_dev, old_child, "_FDI", NULL, 229 &buf); 230 if (ACPI_FAILURE(status)) { 231 if (status != AE_NOT_FOUND) 232 device_printf(ctx->dev, "_FDI failed - %#x\n", status); 233 goto out; 234 } 235 pkg = (ACPI_OBJECT *)buf.Pointer; 236 if (!ACPI_PKG_VALID(pkg, 16)) { 237 device_printf(ctx->dev, "invalid _FDI package\n"); 238 goto out; 239 } 240 obj = &pkg->Package.Elements[1]; 241 if (obj == NULL || obj->Type != ACPI_TYPE_INTEGER) { 242 device_printf(ctx->dev, "invalid type object in _FDI\n"); 243 goto out; 244 } 245 fdc_set_fdtype(child, obj->Integer.Value); 246 247 out: 248 ctx->index++; 249 if (buf.Pointer) 250 free(buf.Pointer, M_TEMP); 251 return (AE_OK); 252 } 253 254 static device_method_t fdc_acpi_methods[] = { 255 /* Device interface */ 256 DEVMETHOD(device_probe, fdc_acpi_probe), 257 DEVMETHOD(device_attach, fdc_acpi_attach), 258 DEVMETHOD(device_detach, fdc_detach), 259 260 /* Bus interface */ 261 DEVMETHOD(bus_print_child, fdc_print_child), 262 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 263 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 264 265 DEVMETHOD_END 266 }; 267 268 static driver_t fdc_acpi_driver = { 269 "fdc", 270 fdc_acpi_methods, 271 sizeof(struct fdc_data) 272 }; 273 274 DRIVER_MODULE(fdc, acpi, fdc_acpi_driver, 0, 0); 275