fdc_isa.c revision 134580
1/*- 2 * Copyright (c) 2004 M. Warner Losh. 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 * without modification, immediately at the beginning of the file. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in 13 * the documentation and/or other materials provided with the 14 * 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 FOR 20 * 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: head/sys/dev/fdc/fdc_isa.c 134580 2004-08-31 20:37:10Z imp $"); 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 49static int fdc_isa_probe(device_t); 50 51static struct isa_pnp_id fdc_ids[] = { 52 {0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */ 53 {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */ 54 {0} 55}; 56 57int 58fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc) 59{ 60 int ispnp, nports; 61 62 ispnp = (fdc->flags & FDC_ISPNP) != 0; 63 fdc->fdc_dev = dev; 64 fdc->rid_ioport = 0; 65 fdc->rid_irq = 0; 66 fdc->rid_drq = 0; 67 fdc->rid_ctl = 1; 68 69 /* 70 * On standard ISA, we don't just use an 8 port range 71 * (e.g. 0x3f0-0x3f7) since that covers an IDE control 72 * register at 0x3f6. 73 * 74 * Isn't PC hardware wonderful. 75 */ 76 nports = ispnp ? 1 : 6; 77 78 /* 79 * Some ACPI BIOSen have _CRS objects for the floppy device that 80 * split the I/O port resource into several resources. We detect 81 * this case by checking if there are more than 2 IOPORT resources. 82 * If so, we use the resource with the smallest start address as 83 * the port RID and the largest start address as the control RID. 84 */ 85 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 2) != 0) { 86 u_long min_start, max_start, tmp; 87 int i; 88 89 /* Find the min/max start addresses and their RIDs. */ 90 max_start = 0ul; 91 min_start = ~0ul; 92 for (i = 0; bus_get_resource_count(dev, SYS_RES_IOPORT, i) > 0; 93 i++) { 94 tmp = bus_get_resource_start(dev, SYS_RES_IOPORT, i); 95 KASSERT(tmp != 0, ("bogus resource")); 96 if (tmp < min_start) { 97 min_start = tmp; 98 fdc->rid_ioport = i; 99 } 100 if (tmp > max_start) { 101 max_start = tmp; 102 fdc->rid_ctl = i; 103 } 104 } 105 } 106 107 fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT, 108 &fdc->rid_ioport, 0ul, ~0ul, nports, RF_ACTIVE); 109 if (fdc->res_ioport == 0) { 110 device_printf(dev, "cannot reserve I/O port range (%d ports)\n", 111 nports); 112 return ENXIO; 113 } 114 fdc->portt = rman_get_bustag(fdc->res_ioport); 115 fdc->porth = rman_get_bushandle(fdc->res_ioport); 116 117 /* 118 * Some BIOSen report the device at 0x3f2-0x3f5,0x3f7 119 * and some at 0x3f0-0x3f5,0x3f7. We detect the former 120 * by checking the size and adjust the port address 121 * accordingly. 122 */ 123 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4) 124 fdc->port_off = -2; 125 126 /* 127 * Register the control port range as rid 1 if it 128 * isn't there already. Most PnP BIOSen will have 129 * already done this but non-PnP configurations don't. 130 * 131 * And some (!!) report 0x3f2-0x3f5 and completely 132 * leave out the control register! It seems that some 133 * non-antique controller chips have a different 134 * method of programming the transfer speed which 135 * doesn't require the control register, but it's 136 * mighty bogus as the chip still responds to the 137 * address for the control register. 138 */ 139 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) { 140 u_long ctlstart; 141 /* Find the control port, usually 0x3f7 */ 142 ctlstart = rman_get_start(fdc->res_ioport) + fdc->port_off + 7; 143 bus_set_resource(dev, SYS_RES_IOPORT, 1, ctlstart, 1); 144 } 145 146 /* 147 * Now (finally!) allocate the control port. 148 */ 149 fdc->res_ctl = bus_alloc_resource_any(dev, SYS_RES_IOPORT, 150 &fdc->rid_ctl, RF_ACTIVE); 151 if (fdc->res_ctl == 0) { 152 device_printf(dev, 153 "cannot reserve control I/O port range (control port)\n"); 154 return ENXIO; 155 } 156 fdc->ctlt = rman_get_bustag(fdc->res_ctl); 157 fdc->ctlh = rman_get_bushandle(fdc->res_ctl); 158 fdc->ctl_off = 0; 159 160 fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &fdc->rid_irq, 161 RF_ACTIVE | RF_SHAREABLE); 162 if (fdc->res_irq == 0) { 163 device_printf(dev, "cannot reserve interrupt line\n"); 164 return ENXIO; 165 } 166 167 if ((fdc->flags & FDC_NODMA) == 0) { 168 fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ, 169 &fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE); 170 if (fdc->res_drq == 0) { 171 device_printf(dev, "cannot reserve DMA request line\n"); 172 fdc->flags |= FDC_NODMA; 173 } else 174 fdc->dmachan = rman_get_start(fdc->res_drq); 175 } 176 177 return 0; 178} 179 180static int 181fdc_isa_probe(device_t dev) 182{ 183 int error; 184 struct fdc_data *fdc; 185 186 fdc = device_get_softc(dev); 187 fdc->fdc_dev = dev; 188 189 /* Check pnp ids */ 190 error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids); 191 if (error == ENXIO) 192 return (ENXIO); 193 194 /* Attempt to allocate our resources for the duration of the probe */ 195 error = fdc_isa_alloc_resources(dev, fdc); 196 if (error == 0) 197 error = fdc_initial_reset(dev, fdc); 198 199 fdc_release_resources(fdc); 200 return (error); 201} 202 203static int 204fdc_isa_attach(device_t dev) 205{ 206 struct fdc_data *fdc; 207 int error; 208 209 fdc = device_get_softc(dev); 210 error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids); 211 if (error == 0) 212 fdc->flags |= FDC_ISPNP; 213 214 error = fdc_isa_alloc_resources(dev, fdc); 215 if (error == 0) 216 error = fdc_attach(dev); 217 if (error == 0) 218 error = fdc_hints_probe(dev); 219 if (error) 220 fdc_release_resources(fdc); 221 return (error); 222} 223 224static device_method_t fdc_methods[] = { 225 /* Device interface */ 226 DEVMETHOD(device_probe, fdc_isa_probe), 227 DEVMETHOD(device_attach, fdc_isa_attach), 228 DEVMETHOD(device_detach, fdc_detach), 229 DEVMETHOD(device_shutdown, bus_generic_shutdown), 230 DEVMETHOD(device_suspend, bus_generic_suspend), 231 DEVMETHOD(device_resume, bus_generic_resume), 232 233 /* Bus interface */ 234 DEVMETHOD(bus_print_child, fdc_print_child), 235 DEVMETHOD(bus_read_ivar, fdc_read_ivar), 236 DEVMETHOD(bus_write_ivar, fdc_write_ivar), 237 /* Our children never use any other bus interface methods. */ 238 239 { 0, 0 } 240}; 241 242static driver_t fdc_driver = { 243 "fdc", 244 fdc_methods, 245 sizeof(struct fdc_data) 246}; 247 248DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0); 249