Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/fdc/fdc_isa.c
Version:
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004-2005 M. Warner Losh. 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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bio.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/module.h> 38 #include <sys/mutex.h> 39 #include <sys/rman.h> 40 #include <sys/systm.h> 41 42 #include <machine/bus.h> 43 44 #include <dev/fdc/fdcvar.h> 45 46 #include <isa/isavar.h> 47 #include <isa/isareg.h> 48 49 static int fdc_isa_probe(device_t); 50 51 static struct isa_pnp_id fdc_ids[] = { 52 {0x0007d041, "PC standard floppy controller"}, /* PNP0700 */ 53 {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */ 54 {0} 55 }; 56 57 /* 58 * On standard ISA, we don't just use an 8 port range 59 * (e.g. 0x3f0-0x3f7) since that covers an IDE control register at 60 * 0x3f6. So, on older hardware, we use 0x3f0-0x3f5 and 0x3f7. 61 * However, some BIOSs omit the control port, while others start at 62 * 0x3f2. Of the latter, sometimes we have two resources, other times 63 * we have one. We have to deal with the following cases: 64 * 65 * 1: 0x3f0-0x3f5 # very rare 66 * 2: 0x3f0 # hints -> 0x3f0-0x3f5,0x3f7 67 * 3: 0x3f0-0x3f5,0x3f7 # Most common 68 * 4: 0x3f2-0x3f5,0x3f7 # Second most common 69 * 5: 0x3f2-0x3f5 # implies 0x3f7 too. 70 * 6: 0x3f2-0x3f3,0x3f4-0x3f5,0x3f7 # becoming common 71 * 7: 0x3f2-0x3f3,0x3f4-0x3f5 # rare 72 * 8: 0x3f0-0x3f1,0x3f2-0x3f3,0x3f4-0x3f5,0x3f7 73 * 9: 0x3f0-0x3f3,0x3f4-0x3f5,0x3f7 74 * 75 * The following code is generic for any value of 0x3fx. It is also 76 * generic for all the above cases, as well as cases where things are 77 * even weirder. 78 */ 79 int 80 fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc) 81 { 82 struct resource *res; 83 int i, j, rid, newrid, nport; 84 u_long port; 85 86 fdc->fdc_dev = dev; 87 rid = 0; 88 for (i = 0; i < FDC_MAXREG; i++) 89 fdc->resio[i] = NULL; 90 91 nport = isa_get_logicalid(dev) ? 1 : 6; 92 for (rid = 0; ; rid++) { 93 newrid = rid; 94 res = bus_alloc_resource_anywhere(dev, SYS_RES_IOPORT, &newrid, 95 rid == 0 ? nport : 1, RF_ACTIVE); 96 if (res == NULL) 97 break; 98 /* 99 * Mask off the upper bits of the register, and sanity 100 * check resource ranges. 101 */ 102 i = rman_get_start(res) & 0x7; 103 if (i + rman_get_size(res) - 1 > FDC_MAXREG) { 104 bus_release_resource(dev, SYS_RES_IOPORT, newrid, res); 105 return (ENXIO); 106 } 107 for (j = 0; j < rman_get_size(res); j++) { 108 fdc->resio[i + j] = res; 109 fdc->ridio[i + j] = newrid; 110 fdc->ioff[i + j] = j; 111 fdc->ioh[i + j] = rman_get_bushandle(res); 112 } 113 } 114 if (fdc->resio[2] == NULL) { 115 device_printf(dev, "No FDOUT register!\n"); 116 return (ENXIO); 117 } 118 fdc->iot = rman_get_bustag(fdc->resio[2]); 119 if (fdc->resio[7] == NULL) { 120 port = (rman_get_start(fdc->resio[2]) & ~0x7) + 7; 121 newrid = rid; 122 res = bus_alloc_resource(dev, SYS_RES_IOPORT, &newrid, port, 123 port, 1, RF_ACTIVE); 124 if (res == NULL) { 125 device_printf(dev, "Faking up FDCTL\n"); 126 fdc->resio[7] = fdc->resio[2]; 127 fdc->ridio[7] = fdc->ridio[2]; 128 fdc->ioff[7] = fdc->ioff[2] + 5; 129 fdc->ioh[7] = fdc->ioh[2]; 130 } else { 131 fdc->resio[7] = res; 132 fdc->ridio[7] = newrid; 133 fdc->ioff[7] = rman_get_start(res) & 7; 134 fdc->ioh[7] = rman_get_bushandle(res); 135 } 136 } 137 138 fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &fdc->rid_irq, 139 RF_ACTIVE | RF_SHAREABLE); 140 if (fdc->res_irq == NULL) { 141 device_printf(dev, "cannot reserve interrupt line\n"); 142 return (ENXIO); 143 } 144 145 if ((fdc->flags & FDC_NODMA) == 0) { 146 fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ, 147 &fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE); 148 if (fdc->res_drq == NULL) { 149 device_printf(dev, "cannot reserve DMA request line\n"); 150 /* This is broken and doesn't work for ISA case */ 151 fdc->flags |= FDC_NODMA; 152 } else 153 fdc->dmachan = rman_get_start(fdc->res_drq); 154 } 155 156 return (0); 157 } 158 159 static int 160 fdc_isa_probe(device_t dev) 161 { 162 int error; 163 struct fdc_data *fdc; 164 165 fdc = device_get_softc(dev); 166 fdc->fdc_dev = dev; 167 168 /* Check pnp ids */ 169 error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids); 170 if (error == ENXIO) 171 return (ENXIO); 172 173 /* Attempt to allocate our resources for the duration of the probe */ 174 error = fdc_isa_alloc_resources(dev, fdc); 175 if (error == 0) 176 error = fdc_initial_reset(dev, fdc); 177 178 fdc_release_resources(fdc); 179 return (error); 180 } 181 182 static int 183 fdc_isa_attach(device_t dev) 184 { 185 struct fdc_data *fdc; 186 int error; 187 188 fdc = device_get_softc(dev); 189 fdc->fdc_dev = dev; 190 error = fdc_isa_alloc_resources(dev, fdc); 191 if (error == 0) 192 error = fdc_attach(dev); 193 if (error == 0) 194 error = fdc_hints_probe(dev); 195 if (error == 0) 196 fdc_start_worker(dev); 197 else 198 fdc_release_resources(fdc); 199 return (error); 200 } 201 202 static device_method_t fdc_methods[] = { 203 /* Device interface */ 204 DEVMETHOD(device_probe, fdc_isa_probe), 205 DEVMETHOD(device_attach, fdc_isa_attach), 206 DEVMETHOD(device_detach, fdc_detach), 207 DEVMETHOD(device_shutdown, bus_generic_shutdown), 208 DEVMETHOD(device_suspend, bus_generic_suspend), 209 DEVMETHOD(device_resume, bus_generic_resume), 210 211 /* Bus interface */ 212 DEVMETHOD(bus_print_child, fdc_print_child), 213 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 214 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 215 /* Our children never use any other bus interface methods. */ 216 217 { 0, 0 } 218 }; 219 220 static driver_t fdc_driver = { 221 "fdc", 222 fdc_methods, 223 sizeof(struct fdc_data) 224 }; 225 226 DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0); 227 ISA_PNP_INFO(fdc_ids);
Cache object: 98afd23c0e8c09b30c124a6ed96cb81b
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