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