bt_isa.c revision 47617 
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 1.12 1999/05/22 15:45:47 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	/* No pnp support */
130	if (isa_get_vendorid(dev))
131		return (ENXIO);
132
133	port_index = 0;
134	max_port_index = BT_NUM_ISAPORTS - 1;
135	/*
136	 * Bound our board search if the user has
137	 * specified an exact port.
138	 */
139	bt_find_probe_range(isa_get_port(dev), &port_index, &max_port_index);
140
141	if (port_index < 0)
142		return (ENXIO);
143
144	/* Attempt to find an adapter */
145	for (;port_index <= max_port_index; port_index++) {
146		struct bt_probe_info info;
147		u_int ioport;
148
149		ioport = bt_iop_from_bio(port_index);
150
151		/*
152		 * Ensure this port has not already been claimed already
153		 * by a PCI, EISA or ISA adapter.
154		 */
155		if (bt_check_probed_iop(ioport) != 0)
156			continue;
157
158		/* Initialise the softc for use during probing */
159		if (bt_isa_alloc_resources(dev, ioport,
160					   ioport + BT_NREGS -1) != 0)
161			continue;
162
163		/* We're going to attempt to probe it now, so mark it probed */
164		bt_mark_probed_bio(port_index);
165
166		if (bt_port_probe(dev, &info) != 0) {
167			printf("bt_isa_probe: Probe failed for card at 0x%x\n",
168			       ioport);
169			bt_isa_release_resources(dev);
170			continue;
171		}
172
173		bt_isa_release_resources(dev);
174
175		ISA_SET_RESOURCE(device_get_parent(dev), dev,
176				 SYS_RES_DRQ, 0, info.drq, 1);
177		ISA_SET_RESOURCE(device_get_parent(dev), dev,
178				 SYS_RES_IRQ, 0, info.irq, 1);
179
180		return (0);
181	}
182
183	return (ENXIO);
184}
185
186/*
187 * Attach all the sub-devices we can find
188 */
189static int
190bt_isa_attach(device_t dev)
191{
192	struct	bt_softc *bt = device_get_softc(dev);
193	bus_dma_filter_t *filter;
194	void		 *filter_arg;
195	bus_addr_t	 lowaddr;
196	int		 error, drq;
197
198	/* Initialise softc */
199	error = bt_isa_alloc_resources(dev, 0, ~0);
200	if (error) {
201		device_printf(dev, "can't allocate resources in bt_isa_attach\n");
202		return error;
203	}
204
205	/* Program the DMA channel for external control */
206	if ((drq = isa_get_drq(dev)) != -1)
207		isa_dmacascade(drq);
208
209	/* Allocate our parent dmatag */
210	filter = NULL;
211	filter_arg = NULL;
212	lowaddr = BUS_SPACE_MAXADDR_24BIT;
213	if (bt->model[0] == '4') {
214		/*
215		 * This is a VL adapter.  Typically, VL devices have access
216		 * to the full 32bit address space.  On BT-445S adapters
217		 * prior to revision E, there is a hardware bug that causes
218		 * corruption of transfers to/from addresses in the range of
219		 * the BIOS modulo 16MB.  The only properly functioning
220		 * BT-445S Host Adapters have firmware version 3.37.
221		 * If we encounter one of these adapters and the BIOS is
222		 * installed, install a filter function for our bus_dma_map
223		 * that will catch these accesses and bounce them to a safe
224		 * region of memory.
225		 */
226		if (bt->bios_addr != 0
227		 && strcmp(bt->model, "445S") == 0
228		 && strcmp(bt->firmware_ver, "3.37") < 0) {
229			filter = btvlbouncefilter;
230			filter_arg = bt;
231		} else {
232			lowaddr = BUS_SPACE_MAXADDR_32BIT;
233		}
234	}
235
236	/* XXX Should be a child of the ISA or VL bus dma tag */
237	if (bus_dma_tag_create(/*parent*/NULL, /*alignemnt*/0, /*boundary*/0,
238                               lowaddr, /*highaddr*/BUS_SPACE_MAXADDR,
239                               filter, filter_arg,
240                               /*maxsize*/BUS_SPACE_MAXSIZE_32BIT,
241                               /*nsegments*/BUS_SPACE_UNRESTRICTED,
242                               /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
243                               /*flags*/0, &bt->parent_dmat) != 0) {
244		bt_isa_release_resources(dev);
245                return (ENOMEM);
246        }
247
248        error = bt_init(dev);
249        if (error) {
250		bt_isa_release_resources(dev);
251                return (ENOMEM);
252        }
253
254	if (lowaddr != BUS_SPACE_MAXADDR_32BIT) {
255		/* DMA tag for our sense buffers */
256		if (bus_dma_tag_create(bt->parent_dmat, /*alignment*/0,
257				       /*boundary*/0,
258				       /*lowaddr*/BUS_SPACE_MAXADDR,
259				       /*highaddr*/BUS_SPACE_MAXADDR,
260				       /*filter*/NULL, /*filterarg*/NULL,
261				       bt->max_ccbs
262					   * sizeof(struct scsi_sense_data),
263				       /*nsegments*/1,
264				       /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
265				       /*flags*/0, &bt->sense_dmat) != 0) {
266			bt_isa_release_resources(dev);
267			return (ENOMEM);
268		}
269
270		bt->init_level++;
271
272		/* Allocation of sense buffers */
273		if (bus_dmamem_alloc(bt->sense_dmat,
274				     (void **)&bt->sense_buffers,
275				     BUS_DMA_NOWAIT, &bt->sense_dmamap) != 0) {
276			bt_isa_release_resources(dev);
277			return (ENOMEM);
278		}
279
280		bt->init_level++;
281
282		/* And permanently map them */
283		bus_dmamap_load(bt->sense_dmat, bt->sense_dmamap,
284       				bt->sense_buffers,
285				bt->max_ccbs * sizeof(*bt->sense_buffers),
286				btmapsensebuffers, bt, /*flags*/0);
287
288		bt->init_level++;
289	}
290
291	error = bt_attach(dev);
292	if (error) {
293		bt_isa_release_resources(dev);
294		return (error);
295	}
296
297	return (0);
298}
299
300#define BIOS_MAP_SIZE (16 * 1024)
301
302static int
303btvlbouncefilter(void *arg, bus_addr_t addr)
304{
305	struct bt_softc *bt;
306
307	bt = (struct bt_softc *)arg;
308
309	addr &= BUS_SPACE_MAXADDR_24BIT;
310
311	if (addr == 0
312	 || (addr >= bt->bios_addr
313	  && addr < (bt->bios_addr + BIOS_MAP_SIZE)))
314		return (1);
315	return (0);
316}
317
318static void
319btmapsensebuffers(void *arg, bus_dma_segment_t *segs, int nseg, int error)
320{
321	struct bt_softc* bt;
322
323	bt = (struct bt_softc*)arg;
324	bt->sense_buffers_physbase = segs->ds_addr;
325}
326
327static device_method_t bt_isa_methods[] = {
328	/* Device interface */
329	DEVMETHOD(device_probe,		bt_isa_probe),
330	DEVMETHOD(device_attach,	bt_isa_attach),
331
332	{ 0, 0 }
333};
334
335static driver_t bt_isa_driver = {
336	"bt",
337	bt_isa_methods,
338	sizeof(struct bt_softc),
339};
340
341static devclass_t bt_devclass;
342
343DRIVER_MODULE(bt, isa, bt_isa_driver, bt_devclass, 0, 0);
344