FreeBSD/Linux Kernel Cross Reference
sys/dev/fdc/fdc_isa.c
1 /*-
2 * Copyright (c) 2004-2005 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 * 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/bio.h>
32 #include <sys/bus.h>
33 #include <sys/kernel.h>
34 #include <sys/lock.h>
35 #include <sys/module.h>
36 #include <sys/mutex.h>
37 #include <sys/rman.h>
38 #include <sys/systm.h>
39
40 #include <machine/bus.h>
41
42 #include <dev/fdc/fdcvar.h>
43
44 #include <isa/isavar.h>
45 #include <isa/isareg.h>
46
47 static int fdc_isa_probe(device_t);
48
49 static struct isa_pnp_id fdc_ids[] = {
50 {0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */
51 {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
52 {0}
53 };
54
55 int
56 fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc)
57 {
58 int nports = 6;
59
60 fdc->fdc_dev = dev;
61 fdc->rid_ioport = 0;
62 fdc->rid_irq = 0;
63 fdc->rid_drq = 0;
64 fdc->rid_ctl = 1;
65
66 /*
67 * On standard ISA, we don't just use an 8 port range
68 * (e.g. 0x3f0-0x3f7) since that covers an IDE control
69 * register at 0x3f6. So, on older hardware, we use
70 * 0x3f0-0x3f5 and 0x3f7. However, some BIOSs omit the
71 * control port, while others start at 0x3f2. Of the latter,
72 * sometimes we have two resources, other times we have one.
73 * We have to deal with the following cases:
74 *
75 * 1: 0x3f0-0x3f5 # very rare
76 * 2: 0x3f0 # hints -> 0x3f0-0x3f5,0x3f7
77 * 3: 0x3f0-0x3f5,0x3f7 # Most common
78 * 4: 0x3f2-0x3f5,0x3f7 # Second most common
79 * 5: 0x3f2-0x3f5 # implies 0x3f7 too.
80 * 6: 0x3f2-0x3f3,0x3f4-0x3f5,0x3f7 # becoming common
81 * 7: 0x3f2-0x3f3,0x3f4-0x3f5 # rare
82 * 8: 0x3f0-0x3f1,0x3f2-0x3f3,0x3f4-0x3f5,0x3f7
83 * 9: 0x3f0-0x3f3,0x3f4-0x3f5,0x3f7
84 *
85 * The following code is generic for any value of 0x3fx :-)
86 */
87
88 /*
89 * First, allocated the main range of ports. In the best of
90 * worlds, this is 4 or 6 ports. In others, well, that's
91 * why this function is so complicated.
92 */
93 again_ioport:
94 fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,
95 &fdc->rid_ioport, 0ul, ~0ul, nports, RF_ACTIVE);
96 if (fdc->res_ioport == 0) {
97 device_printf(dev, "cannot allocate I/O port (%d ports)\n",
98 nports);
99 return (ENXIO);
100 }
101 if ((rman_get_end(fdc->res_ioport) & 0x7) == 1) {
102 /* Case 8 */
103 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
104 fdc->res_ioport);
105 fdc->rid_ioport++;
106 goto again_ioport;
107 }
108 fdc->portt = rman_get_bustag(fdc->res_ioport);
109 fdc->porth = rman_get_bushandle(fdc->res_ioport);
110
111 /*
112 * Handle cases 4-8 above
113 */
114 fdc->port_off = -(fdc->porth & 0x7);
115
116 /*
117 * Deal with case 6-9: FDSTS and FDDATA.
118 */
119 if ((rman_get_end(fdc->res_ioport) & 0x7) == 3) {
120 fdc->rid_sts = fdc->rid_ioport + 1;
121 fdc->res_sts = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
122 &fdc->rid_sts, RF_ACTIVE);
123 if (fdc->res_sts == NULL) {
124 device_printf(dev, "Can't alloc rid 1");
125 fdc_release_resources(fdc);
126 return (ENXIO);
127 }
128 fdc->sts_off = -4;
129 fdc->stst = rman_get_bustag(fdc->res_sts);
130 fdc->stsh = rman_get_bushandle(fdc->res_sts);
131 } else {
132 fdc->res_sts = NULL;
133 fdc->sts_off = fdc->port_off;
134 fdc->stst = fdc->portt;
135 fdc->stsh = fdc->porth;
136 }
137
138 /*
139 * allocate the control port. For cases 1, 2, 5 and 7, we
140 * fake it from the ioports resource. XXX IS THIS THE RIGHT THING
141 * TO DO, OR SHOULD WE CREATE A NEW RID? (I think we need a new rid)
142 */
143 fdc->rid_ctl = fdc->rid_sts + 1;
144 fdc->res_ctl = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
145 &fdc->rid_ctl, RF_ACTIVE);
146 if (fdc->res_ctl == NULL) {
147 fdc->ctl_off = 7 + fdc->port_off;
148 fdc->res_ctl = NULL;
149 fdc->ctlt = fdc->portt;
150 fdc->ctlh = fdc->porth;
151 } else {
152 fdc->ctl_off = 0;
153 fdc->ctlt = rman_get_bustag(fdc->res_ctl);
154 fdc->ctlh = rman_get_bushandle(fdc->res_ctl);
155 }
156
157 fdc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &fdc->rid_irq,
158 RF_ACTIVE | RF_SHAREABLE);
159 if (fdc->res_irq == 0) {
160 device_printf(dev, "cannot reserve interrupt line\n");
161 return (ENXIO);
162 }
163
164 if ((fdc->flags & FDC_NODMA) == 0) {
165 fdc->res_drq = bus_alloc_resource_any(dev, SYS_RES_DRQ,
166 &fdc->rid_drq, RF_ACTIVE | RF_SHAREABLE);
167 if (fdc->res_drq == 0) {
168 device_printf(dev, "cannot reserve DMA request line\n");
169 /* This is broken and doesn't work for ISA case */
170 fdc->flags |= FDC_NODMA;
171 } else
172 fdc->dmachan = rman_get_start(fdc->res_drq);
173 }
174
175 return (0);
176 }
177
178 static int
179 fdc_isa_probe(device_t dev)
180 {
181 int error;
182 struct fdc_data *fdc;
183
184 fdc = device_get_softc(dev);
185 fdc->fdc_dev = dev;
186
187 /* Check pnp ids */
188 error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
189 if (error == ENXIO)
190 return (ENXIO);
191
192 /* Attempt to allocate our resources for the duration of the probe */
193 error = fdc_isa_alloc_resources(dev, fdc);
194 if (error == 0)
195 error = fdc_initial_reset(dev, fdc);
196
197 fdc_release_resources(fdc);
198 return (error);
199 }
200
201 static int
202 fdc_isa_attach(device_t dev)
203 {
204 struct fdc_data *fdc;
205 int error;
206
207 fdc = device_get_softc(dev);
208 error = fdc_isa_alloc_resources(dev, fdc);
209 if (error == 0)
210 error = fdc_attach(dev);
211 if (error == 0)
212 error = fdc_hints_probe(dev);
213 if (error)
214 fdc_release_resources(fdc);
215 return (error);
216 }
217
218 static device_method_t fdc_methods[] = {
219 /* Device interface */
220 DEVMETHOD(device_probe, fdc_isa_probe),
221 DEVMETHOD(device_attach, fdc_isa_attach),
222 DEVMETHOD(device_detach, fdc_detach),
223 DEVMETHOD(device_shutdown, bus_generic_shutdown),
224 DEVMETHOD(device_suspend, bus_generic_suspend),
225 DEVMETHOD(device_resume, bus_generic_resume),
226
227 /* Bus interface */
228 DEVMETHOD(bus_print_child, fdc_print_child),
229 DEVMETHOD(bus_read_ivar, fdc_read_ivar),
230 DEVMETHOD(bus_write_ivar, fdc_write_ivar),
231 /* Our children never use any other bus interface methods. */
232
233 { 0, 0 }
234 };
235
236 static driver_t fdc_driver = {
237 "fdc",
238 fdc_methods,
239 sizeof(struct fdc_data)
240 };
241
242 DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);
Cache object: e3f401b11b4135847542563ef8ce000f
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