bt_isa.c revision 47399 
1/*
2 * Product specific probe and attach routines for:
3 *      Buslogic BT-54X and BT-445 cards
4 *
5 * Copyright (c) 1998, 1999 Justin T. Gibbs
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions, and the following disclaimer,
13 *    without modification, immediately at the beginning of the file.
14 * 2. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	$Id: bt_isa.c,v 1.11 1999/05/08 21:59:23 dfr Exp $
30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/module.h>
36#include <sys/bus.h>
37
38#include <machine/bus_pio.h>
39#include <machine/bus.h>
40#include <machine/resource.h>
41#include <sys/rman.h>
42
43#include <isa/isavar.h>
44#include <i386/isa/isa_dma.h>
45#include <dev/buslogic/btreg.h>
46
47#include <cam/scsi/scsi_all.h>
48
49static	bus_dma_filter_t btvlbouncefilter;
50static	bus_dmamap_callback_t btmapsensebuffers;
51
52static int
53bt_isa_alloc_resources(device_t dev, u_long portstart, u_long portend)
54{
55	int rid;
56	struct resource *port;
57	struct resource *irq;
58	struct resource *drq;
59
60	rid = 0;
61	port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
62				  portstart, portend, BT_NREGS, RF_ACTIVE);
63	if (!port)
64		return (ENOMEM);
65
66	if (isa_get_irq(dev) != -1) {
67		rid = 0;
68		irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid,
69					 0, ~0, 1, RF_ACTIVE);
70		if (!irq) {
71			if (port)
72				bus_release_resource(dev, SYS_RES_IOPORT,
73						     0, port);
74			return (ENOMEM);
75		}
76	} else
77		irq = 0;
78
79	if (isa_get_drq(dev) != -1) {
80		rid = 0;
81		drq = bus_alloc_resource(dev, SYS_RES_DRQ, &rid,
82					 0, ~0, 1, RF_ACTIVE);
83		if (!drq) {
84			if (port)
85				bus_release_resource(dev, SYS_RES_IOPORT,
86						     0, port);
87			if (irq)
88				bus_release_resource(dev, SYS_RES_IRQ,
89						     0, irq);
90			return (ENOMEM);
91		}
92	} else
93		drq = 0;
94
95	bt_init_softc(dev, port, irq, drq);
96
97	return (0);
98}
99
100static void
101bt_isa_release_resources(device_t dev)
102{
103	struct	bt_softc *bt = device_get_softc(dev);
104
105	if (bt->port)
106		bus_release_resource(dev, SYS_RES_IOPORT, 0, bt->port);
107	if (bt->irq)
108		bus_release_resource(dev, SYS_RES_IRQ, 0, bt->irq);
109	if (bt->drq)
110		bus_release_resource(dev, SYS_RES_DRQ, 0, bt->drq);
111	bt_free_softc(dev);
112}
113
114/*
115 * Check if the device can be found at the port given
116 * and if so, set it up ready for further work
117 * as an argument, takes the isa_device structure from
118 * autoconf.c
119 */
120static int
121bt_isa_probe(device_t dev)
122{
123	/*
124	 * find unit and check we have that many defined
125	 */
126	int	port_index;
127        int	max_port_index;
128
129	port_index = 0;
130	max_port_index = BT_NUM_ISAPORTS - 1;
131	/*
132	 * Bound our board search if the user has
133	 * specified an exact port.
134	 */
135	bt_find_probe_range(isa_get_port(dev), &port_index, &max_port_index);
136
137	if (port_index < 0)
138		return (ENXIO);
139
140	/* Attempt to find an adapter */
141	for (;port_index <= max_port_index; port_index++) {
142		struct bt_probe_info info;
143		u_int ioport;
144
145		ioport = bt_iop_from_bio(port_index);
146
147		/*
148		 * Ensure this port has not already been claimed already
149		 * by a PCI, EISA or ISA adapter.
150		 */
151		if (bt_check_probed_iop(ioport) != 0)
152			continue;
153
154		/* Initialise the softc for use during probing */
155		if (bt_isa_alloc_resources(dev, ioport,
156					   ioport + BT_NREGS -1) != 0)
157			continue;
158
159		/* We're going to attempt to probe it now, so mark it probed */
160		bt_mark_probed_bio(port_index);
161
162		if (bt_port_probe(dev, &info) != 0) {
163			printf("bt_isa_probe: Probe failed for card at 0x%x\n",
164			       ioport);
165			bt_isa_release_resources(dev);
166			continue;
167		}
168
169		bt_isa_release_resources(dev);
170
171		ISA_SET_RESOURCE(device_get_parent(dev), dev,
172				 SYS_RES_DRQ, 0, info.drq, 1);
173		ISA_SET_RESOURCE(device_get_parent(dev), dev,
174				 SYS_RES_IRQ, 0, info.irq, 1);
175
176		return (0);
177	}
178
179	return (ENXIO);
180}
181
182/*
183 * Attach all the sub-devices we can find
184 */
185static int
186bt_isa_attach(device_t dev)
187{
188	struct	bt_softc *bt = device_get_softc(dev);
189	bus_dma_filter_t *filter;
190	void		 *filter_arg;
191	bus_addr_t	 lowaddr;
192	int		 error, drq;
193
194	/* Initialise softc */
195	error = bt_isa_alloc_resources(dev, 0, ~0);
196	if (error) {
197		device_printf(dev, "can't allocate resources in bt_isa_attach\n");
198		return error;
199	}
200
201	/* Program the DMA channel for external control */
202	if ((drq = isa_get_drq(dev)) != -1)
203		isa_dmacascade(drq);
204
205	/* Allocate our parent dmatag */
206	filter = NULL;
207	filter_arg = NULL;
208	lowaddr = BUS_SPACE_MAXADDR_24BIT;
209	if (bt->model[0] == '4') {
210		/*
211		 * This is a VL adapter.  Typically, VL devices have access
212		 * to the full 32bit address space.  On BT-445S adapters
213		 * prior to revision E, there is a hardware bug that causes
214		 * corruption of transfers to/from addresses in the range of
215		 * the BIOS modulo 16MB.  The only properly functioning
216		 * BT-445S Host Adapters have firmware version 3.37.
217		 * If we encounter one of these adapters and the BIOS is
218		 * installed, install a filter function for our bus_dma_map
219		 * that will catch these accesses and bounce them to a safe
220		 * region of memory.
221		 */
222		if (bt->bios_addr != 0
223		 && strcmp(bt->model, "445S") == 0
224		 && strcmp(bt->firmware_ver, "3.37") < 0) {
225			filter = btvlbouncefilter;
226			filter_arg = bt;
227		} else {
228			lowaddr = BUS_SPACE_MAXADDR_32BIT;
229		}
230	}
231
232	/* XXX Should be a child of the ISA or VL bus dma tag */
233	if (bus_dma_tag_create(/*parent*/NULL, /*alignemnt*/0, /*boundary*/0,
234                               lowaddr, /*highaddr*/BUS_SPACE_MAXADDR,
235                               filter, filter_arg,
236                               /*maxsize*/BUS_SPACE_MAXSIZE_32BIT,
237                               /*nsegments*/BUS_SPACE_UNRESTRICTED,
238                               /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
239                               /*flags*/0, &bt->parent_dmat) != 0) {
240		bt_isa_release_resources(dev);
241                return (ENOMEM);
242        }
243
244        error = bt_init(dev);
245        if (error) {
246		bt_isa_release_resources(dev);
247                return (ENOMEM);
248        }
249
250	if (lowaddr != BUS_SPACE_MAXADDR_32BIT) {
251		/* DMA tag for our sense buffers */
252		if (bus_dma_tag_create(bt->parent_dmat, /*alignment*/0,
253				       /*boundary*/0,
254				       /*lowaddr*/BUS_SPACE_MAXADDR,
255				       /*highaddr*/BUS_SPACE_MAXADDR,
256				       /*filter*/NULL, /*filterarg*/NULL,
257				       bt->max_ccbs
258					   * sizeof(struct scsi_sense_data),
259				       /*nsegments*/1,
260				       /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
261				       /*flags*/0, &bt->sense_dmat) != 0) {
262			bt_isa_release_resources(dev);
263			return (ENOMEM);
264		}
265
266		bt->init_level++;
267
268		/* Allocation of sense buffers */
269		if (bus_dmamem_alloc(bt->sense_dmat,
270				     (void **)&bt->sense_buffers,
271				     BUS_DMA_NOWAIT, &bt->sense_dmamap) != 0) {
272			bt_isa_release_resources(dev);
273			return (ENOMEM);
274		}
275
276		bt->init_level++;
277
278		/* And permanently map them */
279		bus_dmamap_load(bt->sense_dmat, bt->sense_dmamap,
280       				bt->sense_buffers,
281				bt->max_ccbs * sizeof(*bt->sense_buffers),
282				btmapsensebuffers, bt, /*flags*/0);
283
284		bt->init_level++;
285	}
286
287	error = bt_attach(dev);
288	if (error) {
289		bt_isa_release_resources(dev);
290		return (error);
291	}
292
293	return (0);
294}
295
296#define BIOS_MAP_SIZE (16 * 1024)
297
298static int
299btvlbouncefilter(void *arg, bus_addr_t addr)
300{
301	struct bt_softc *bt;
302
303	bt = (struct bt_softc *)arg;
304
305	addr &= BUS_SPACE_MAXADDR_24BIT;
306
307	if (addr == 0
308	 || (addr >= bt->bios_addr
309	  && addr < (bt->bios_addr + BIOS_MAP_SIZE)))
310		return (1);
311	return (0);
312}
313
314static void
315btmapsensebuffers(void *arg, bus_dma_segment_t *segs, int nseg, int error)
316{
317	struct bt_softc* bt;
318
319	bt = (struct bt_softc*)arg;
320	bt->sense_buffers_physbase = segs->ds_addr;
321}
322
323static device_method_t bt_isa_methods[] = {
324	/* Device interface */
325	DEVMETHOD(device_probe,		bt_isa_probe),
326	DEVMETHOD(device_attach,	bt_isa_attach),
327
328	{ 0, 0 }
329};
330
331static driver_t bt_isa_driver = {
332	"bt",
333	bt_isa_methods,
334	sizeof(struct bt_softc),
335};
336
337static devclass_t bt_devclass;
338
339DRIVER_MODULE(bt, isa, bt_isa_driver, bt_devclass, 0, 0);
340