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 <imp@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/bio.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/lock.h> 36 #include <sys/module.h> 37 #include <sys/mutex.h> 38 #include <sys/rman.h> 39 #include <sys/systm.h> 40 41 #include <machine/bus.h> 42 43 #include <dev/fdc/fdcvar.h> 44 45 #include <isa/isavar.h> 46 #include <isa/isareg.h> 47 48 static int fdc_isa_probe(device_t); 49 50 static struct isa_pnp_id fdc_ids[] = { 51 {0x0007d041, "PC standard floppy controller"}, /* PNP0700 */ 52 {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */ 53 {0} 54 }; 55 56 /* 57 * On standard ISA, we don't just use an 8 port range 58 * (e.g. 0x3f0-0x3f7) since that covers an IDE control register at 59 * 0x3f6. So, on older hardware, we use 0x3f0-0x3f5 and 0x3f7. 60 * However, some BIOSs omit the control port, while others start at 61 * 0x3f2. Of the latter, sometimes we have two resources, other times 62 * we have one. We have to deal with the following cases: 63 * 64 * 1: 0x3f0-0x3f5 # very rare 65 * 2: 0x3f0 # hints -> 0x3f0-0x3f5,0x3f7 66 * 3: 0x3f0-0x3f5,0x3f7 # Most common 67 * 4: 0x3f2-0x3f5,0x3f7 # Second most common 68 * 5: 0x3f2-0x3f5 # implies 0x3f7 too. 69 * 6: 0x3f2-0x3f3,0x3f4-0x3f5,0x3f7 # becoming common 70 * 7: 0x3f2-0x3f3,0x3f4-0x3f5 # rare 71 * 8: 0x3f0-0x3f1,0x3f2-0x3f3,0x3f4-0x3f5,0x3f7 72 * 9: 0x3f0-0x3f3,0x3f4-0x3f5,0x3f7 73 * 74 * The following code is generic for any value of 0x3fx. It is also 75 * generic for all the above cases, as well as cases where things are 76 * even weirder. 77 */ 78 int 79 fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc) 80 { 81 struct resource *res; 82 int i, j, rid, newrid, nport; 83 u_long port; 84 85 fdc->fdc_dev = dev; 86 rid = 0; 87 for (i = 0; i < FDC_MAXREG; i++) 88 fdc->resio[i] = NULL; 89 90 nport = isa_get_logicalid(dev) ? 1 : 6; 91 for (rid = 0; ; rid++) { 92 newrid = rid; 93 res = bus_alloc_resource_anywhere(dev, SYS_RES_IOPORT, &newrid, 94 rid == 0 ? nport : 1, RF_ACTIVE); 95 if (res == NULL) 96 break; 97 /* 98 * Mask off the upper bits of the register, and sanity 99 * check resource ranges. 100 */ 101 i = rman_get_start(res) & 0x7; 102 if (i + rman_get_size(res) - 1 > FDC_MAXREG) { 103 bus_release_resource(dev, SYS_RES_IOPORT, newrid, res); 104 return (ENXIO); 105 } 106 for (j = 0; j < rman_get_size(res); j++) { 107 fdc->resio[i + j] = res; 108 fdc->ridio[i + j] = newrid; 109 fdc->ioff[i + j] = j; 110 fdc->ioh[i + j] = rman_get_bushandle(res); 111 } 112 } 113 if (fdc->resio[2] == NULL) { 114 device_printf(dev, "No FDOUT register!\n"); 115 return (ENXIO); 116 } 117 fdc->iot = rman_get_bustag(fdc->resio[2]); 118 if (fdc->resio[7] == NULL) { 119 port = (rman_get_start(fdc->resio[2]) & ~0x7) + 7; 120 newrid = rid; 121 res = bus_alloc_resource(dev, SYS_RES_IOPORT, &newrid, port, 122 port, 1, RF_ACTIVE); 123 if (res == NULL) { 124 device_printf(dev, "Faking up FDCTL\n"); 125 fdc->resio[7] = fdc->resio[2]; 126 fdc->ridio[7] = fdc->ridio[2]; 127 fdc->ioff[7] = fdc->ioff[2] + 5; 128 fdc->ioh[7] = fdc->ioh[2]; 129 } else { 130 fdc->resio[7] = res; 131 fdc->ridio[7] = newrid; 132 fdc->ioff[7] = rman_get_start(res) & 7; 133 fdc->ioh[7] = rman_get_bushandle(res); 134 } 135 } 136 137 fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &fdc->rid_irq, 138 RF_ACTIVE | RF_SHAREABLE); 139 if (fdc->res_irq == NULL) { 140 device_printf(dev, "cannot reserve interrupt line\n"); 141 return (ENXIO); 142 } 143 144 if ((fdc->flags & FDC_NODMA) == 0) { 145 fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ, 146 &fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE); 147 if (fdc->res_drq == NULL) { 148 device_printf(dev, "cannot reserve DMA request line\n"); 149 /* This is broken and doesn't work for ISA case */ 150 fdc->flags |= FDC_NODMA; 151 } else 152 fdc->dmachan = rman_get_start(fdc->res_drq); 153 } 154 155 return (0); 156 } 157 158 static int 159 fdc_isa_probe(device_t dev) 160 { 161 int error; 162 struct fdc_data *fdc; 163 164 fdc = device_get_softc(dev); 165 fdc->fdc_dev = dev; 166 167 /* Check pnp ids */ 168 error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids); 169 if (error == ENXIO) 170 return (ENXIO); 171 172 /* Attempt to allocate our resources for the duration of the probe */ 173 error = fdc_isa_alloc_resources(dev, fdc); 174 if (error == 0) 175 error = fdc_initial_reset(dev, fdc); 176 177 fdc_release_resources(fdc); 178 return (error); 179 } 180 181 static int 182 fdc_isa_attach(device_t dev) 183 { 184 struct fdc_data *fdc; 185 int error; 186 187 fdc = device_get_softc(dev); 188 fdc->fdc_dev = dev; 189 error = fdc_isa_alloc_resources(dev, fdc); 190 if (error == 0) 191 error = fdc_attach(dev); 192 if (error == 0) 193 error = fdc_hints_probe(dev); 194 if (error == 0) 195 fdc_start_worker(dev); 196 else 197 fdc_release_resources(fdc); 198 return (error); 199 } 200 201 static device_method_t fdc_methods[] = { 202 /* Device interface */ 203 DEVMETHOD(device_probe, fdc_isa_probe), 204 DEVMETHOD(device_attach, fdc_isa_attach), 205 DEVMETHOD(device_detach, fdc_detach), 206 DEVMETHOD(device_shutdown, bus_generic_shutdown), 207 DEVMETHOD(device_suspend, bus_generic_suspend), 208 DEVMETHOD(device_resume, bus_generic_resume), 209 210 /* Bus interface */ 211 DEVMETHOD(bus_print_child, fdc_print_child), 212 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 213 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 214 /* Our children never use any other bus interface methods. */ 215 216 { 0, 0 } 217 }; 218 219 static driver_t fdc_driver = { 220 "fdc", 221 fdc_methods, 222 sizeof(struct fdc_data) 223 }; 224 225 DRIVER_MODULE(fdc, isa, fdc_driver, 0, 0); 226 ISA_PNP_INFO(fdc_ids);
Cache object: d629e3af6597fac44edb44e16df7e310
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