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1/*
2 * Written by Martin Kolinek, February 1996
3 *
4 * Changes:
5 *
6 * Chris Beauregard July 28th, 1996
7 * - Fixed up integrated SCSI detection
8 *
9 * Chris Beauregard August 3rd, 1996
10 * - Made mca_info local
11 * - Made integrated registers accessible through standard function calls
12 * - Added name field
13 * - More sanity checking
14 *
15 * Chris Beauregard August 9th, 1996
16 * - Rewrote /proc/mca
17 *
18 * Chris Beauregard January 7th, 1997
19 * - Added basic NMI-processing
20 * - Added more information to mca_info structure
21 *
22 * David Weinehall October 12th, 1998
23 * - Made a lot of cleaning up in the source
24 * - Added use of save_flags / restore_flags
25 * - Added the 'driver_loaded' flag in MCA_adapter
26 * - Added an alternative implemention of ZP Gu's mca_find_unused_adapter
27 *
28 * David Weinehall March 24th, 1999
29 * - Fixed the output of 'Driver Installed' in /proc/mca/pos
30 * - Made the Integrated Video & SCSI show up even if they have id 0000
31 *
32 * Alexander Viro November 9th, 1999
33 * - Switched to regular procfs methods
34 *
35 * Alfred Arnold & David Weinehall August 23rd, 2000
36 * - Added support for Planar POS-registers
37 */
38
39#include <linux/module.h>
40#include <linux/types.h>
41#include <linux/errno.h>
42#include <linux/kernel.h>
43#include <linux/mca.h>
44#include <linux/kprobes.h>
45#include <linux/slab.h>
46#include <asm/system.h>
47#include <asm/io.h>
48#include <linux/proc_fs.h>
49#include <linux/mman.h>
50#include <linux/mm.h>
51#include <linux/pagemap.h>
52#include <linux/ioport.h>
53#include <asm/uaccess.h>
54#include <linux/init.h>
55
56static unsigned char which_scsi;
57
58int MCA_bus;
59EXPORT_SYMBOL(MCA_bus);
60
61/*
62 * Motherboard register spinlock. Untested on SMP at the moment, but
63 * are there any MCA SMP boxes?
64 *
65 * Yes - Alan
66 */
67static DEFINE_SPINLOCK(mca_lock);
68
69/* Build the status info for the adapter */
70
71static void mca_configure_adapter_status(struct mca_device *mca_dev)
72{
73 mca_dev->status = MCA_ADAPTER_NONE;
74
75 mca_dev->pos_id = mca_dev->pos[0]
76 + (mca_dev->pos[1] << 8);
77
78 if (!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) {
79
80 /*
81 * id = 0x0000 usually indicates hardware failure,
82 * however, ZP Gu (zpg@castle.net> reports that his 9556
83 * has 0x0000 as id and everything still works. There
84 * also seem to be an adapter with id = 0x0000; the
85 * NCR Parallel Bus Memory Card. Until this is confirmed,
86 * however, this code will stay.
87 */
88
89 mca_dev->status = MCA_ADAPTER_ERROR;
90
91 return;
92 } else if (mca_dev->pos_id != 0xffff) {
93
94 /*
95 * 0xffff usually indicates that there's no adapter,
96 * however, some integrated adapters may have 0xffff as
97 * their id and still be valid. Examples are on-board
98 * VGA of the 55sx, the integrated SCSI of the 56 & 57,
99 * and possibly also the 95 ULTIMEDIA.
100 */
101
102 mca_dev->status = MCA_ADAPTER_NORMAL;
103 }
104
105 if ((mca_dev->pos_id == 0xffff ||
106 mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
107 int j;
108
109 for (j = 2; j < 8; j++) {
110 if (mca_dev->pos[j] != 0xff) {
111 mca_dev->status = MCA_ADAPTER_NORMAL;
112 break;
113 }
114 }
115 }
116
117 if (!(mca_dev->pos[2] & MCA_ENABLED)) {
118
119 /* enabled bit is in POS 2 */
120
121 mca_dev->status = MCA_ADAPTER_DISABLED;
122 }
123} /* mca_configure_adapter_status */
124
125/*--------------------------------------------------------------------*/
126
127static struct resource mca_standard_resources[] = {
128 { .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
129 { .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
130 { .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
131 { .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
132 { .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
133 { .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
134 { .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
135};
136
137#define MCA_STANDARD_RESOURCES ARRAY_SIZE(mca_standard_resources)
138
139/*
140 * mca_read_and_store_pos - read the POS registers into a memory buffer
141 * @pos: a char pointer to 8 bytes, contains the POS register value on
142 * successful return
143 *
144 * Returns 1 if a card actually exists (i.e. the pos isn't
145 * all 0xff) or 0 otherwise
146 */
147static int mca_read_and_store_pos(unsigned char *pos)
148{
149 int j;
150 int found = 0;
151
152 for (j = 0; j < 8; j++) {
153 pos[j] = inb_p(MCA_POS_REG(j));
154 if (pos[j] != 0xff) {
155 /* 0xff all across means no device. 0x00 means
156 * something's broken, but a device is
157 * probably there. However, if you get 0x00
158 * from a motherboard register it won't matter
159 * what we find. For the record, on the
160 * 57SLC, the integrated SCSI adapter has
161 * 0xffff for the adapter ID, but nonzero for
162 * other registers. */
163
164 found = 1;
165 }
166 }
167 return found;
168}
169
170static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
171{
172 unsigned char byte;
173 unsigned long flags;
174
175 if (reg < 0 || reg >= 8)
176 return 0;
177
178 spin_lock_irqsave(&mca_lock, flags);
179 if (mca_dev->pos_register) {
180 /* Disable adapter setup, enable motherboard setup */
181
182 outb_p(0, MCA_ADAPTER_SETUP_REG);
183 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
184
185 byte = inb_p(MCA_POS_REG(reg));
186 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
187 } else {
188
189 /* Make sure motherboard setup is off */
190
191 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
192
193 /* Read the appropriate register */
194
195 outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
196 byte = inb_p(MCA_POS_REG(reg));
197 outb_p(0, MCA_ADAPTER_SETUP_REG);
198 }
199 spin_unlock_irqrestore(&mca_lock, flags);
200
201 mca_dev->pos[reg] = byte;
202
203 return byte;
204}
205
206static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
207 unsigned char byte)
208{
209 unsigned long flags;
210
211 if (reg < 0 || reg >= 8)
212 return;
213
214 spin_lock_irqsave(&mca_lock, flags);
215
216 /* Make sure motherboard setup is off */
217
218 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
219
220 /* Read in the appropriate register */
221
222 outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
223 outb_p(byte, MCA_POS_REG(reg));
224 outb_p(0, MCA_ADAPTER_SETUP_REG);
225
226 spin_unlock_irqrestore(&mca_lock, flags);
227
228 /* Update the global register list, while we have the byte */
229
230 mca_dev->pos[reg] = byte;
231
232}
233
234/* for the primary MCA bus, we have identity transforms */
235static int mca_dummy_transform_irq(struct mca_device *mca_dev, int irq)
236{
237 return irq;
238}
239
240static int mca_dummy_transform_ioport(struct mca_device *mca_dev, int port)
241{
242 return port;
243}
244
245static void *mca_dummy_transform_memory(struct mca_device *mca_dev, void *mem)
246{
247 return mem;
248}
249
250
251static int __init mca_init(void)
252{
253 unsigned int i, j;
254 struct mca_device *mca_dev;
255 unsigned char pos[8];
256 short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
257 struct mca_bus *bus;
258
259 /*
260 * WARNING: Be careful when making changes here. Putting an adapter
261 * and the motherboard simultaneously into setup mode may result in
262 * damage to chips (according to The Indispensable PC Hardware Book
263 * by Hans-Peter Messmer). Also, we disable system interrupts (so
264 * that we are not disturbed in the middle of this).
265 */
266
267 /* Make sure the MCA bus is present */
268
269 if (mca_system_init()) {
270 printk(KERN_ERR "MCA bus system initialisation failed\n");
271 return -ENODEV;
272 }
273
274 if (!MCA_bus)
275 return -ENODEV;
276
277 printk(KERN_INFO "Micro Channel bus detected.\n");
278
279 /* All MCA systems have at least a primary bus */
280 bus = mca_attach_bus(MCA_PRIMARY_BUS);
281 if (!bus)
282 goto out_nomem;
283 bus->default_dma_mask = 0xffffffffLL;
284 bus->f.mca_write_pos = mca_pc_write_pos;
285 bus->f.mca_read_pos = mca_pc_read_pos;
286 bus->f.mca_transform_irq = mca_dummy_transform_irq;
287 bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
288 bus->f.mca_transform_memory = mca_dummy_transform_memory;
289
290 /* get the motherboard device */
291 mca_dev = kzalloc(sizeof(struct mca_device), GFP_KERNEL);
292 if (unlikely(!mca_dev))
293 goto out_nomem;
294
295 /*
296 * We do not expect many MCA interrupts during initialization,
297 * but let us be safe:
298 */
299 spin_lock_irq(&mca_lock);
300
301 /* Make sure adapter setup is off */
302
303 outb_p(0, MCA_ADAPTER_SETUP_REG);
304
305 /* Read motherboard POS registers */
306
307 mca_dev->pos_register = 0x7f;
308 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
309 mca_dev->name[0] = 0;
310 mca_read_and_store_pos(mca_dev->pos);
311 mca_configure_adapter_status(mca_dev);
312 /* fake POS and slot for a motherboard */
313 mca_dev->pos_id = MCA_MOTHERBOARD_POS;
314 mca_dev->slot = MCA_MOTHERBOARD;
315 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
316
317 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
318 if (unlikely(!mca_dev))
319 goto out_unlock_nomem;
320
321 /* Put motherboard into video setup mode, read integrated video
322 * POS registers, and turn motherboard setup off.
323 */
324
325 mca_dev->pos_register = 0xdf;
326 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
327 mca_dev->name[0] = 0;
328 mca_read_and_store_pos(mca_dev->pos);
329 mca_configure_adapter_status(mca_dev);
330 /* fake POS and slot for the integrated video */
331 mca_dev->pos_id = MCA_INTEGVIDEO_POS;
332 mca_dev->slot = MCA_INTEGVIDEO;
333 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
334
335 /*
336 * Put motherboard into scsi setup mode, read integrated scsi
337 * POS registers, and turn motherboard setup off.
338 *
339 * It seems there are two possible SCSI registers. Martin says that
340 * for the 56,57, 0xf7 is the one, but fails on the 76.
341 * Alfredo (apena@vnet.ibm.com) says
342 * 0xfd works on his machine. We'll try both of them. I figure it's
343 * a good bet that only one could be valid at a time. This could
344 * screw up though if one is used for something else on the other
345 * machine.
346 */
347
348 for (i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
349 outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
350 if (mca_read_and_store_pos(pos))
351 break;
352 }
353 if (which_scsi) {
354 /* found a scsi card */
355 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
356 if (unlikely(!mca_dev))
357 goto out_unlock_nomem;
358
359 for (j = 0; j < 8; j++)
360 mca_dev->pos[j] = pos[j];
361
362 mca_configure_adapter_status(mca_dev);
363 /* fake POS and slot for integrated SCSI controller */
364 mca_dev->pos_id = MCA_INTEGSCSI_POS;
365 mca_dev->slot = MCA_INTEGSCSI;
366 mca_dev->pos_register = which_scsi;
367 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
368 }
369
370 /* Turn off motherboard setup */
371
372 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
373
374 /*
375 * Now loop over MCA slots: put each adapter into setup mode, and
376 * read its POS registers. Then put adapter setup off.
377 */
378
379 for (i = 0; i < MCA_MAX_SLOT_NR; i++) {
380 outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
381 if (!mca_read_and_store_pos(pos))
382 continue;
383
384 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
385 if (unlikely(!mca_dev))
386 goto out_unlock_nomem;
387
388 for (j = 0; j < 8; j++)
389 mca_dev->pos[j] = pos[j];
390
391 mca_dev->driver_loaded = 0;
392 mca_dev->slot = i;
393 mca_dev->pos_register = 0;
394 mca_configure_adapter_status(mca_dev);
395 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
396 }
397 outb_p(0, MCA_ADAPTER_SETUP_REG);
398
399 /* Enable interrupts and return memory start */
400 spin_unlock_irq(&mca_lock);
401
402 for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
403 request_resource(&ioport_resource, mca_standard_resources + i);
404
405 mca_do_proc_init();
406
407 return 0;
408
409 out_unlock_nomem:
410 spin_unlock_irq(&mca_lock);
411 out_nomem:
412 printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
413 return -ENOMEM;
414}
415
416subsys_initcall(mca_init);
417
418/*--------------------------------------------------------------------*/
419
420static __kprobes void
421mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
422{
423 int slot = mca_dev->slot;
424
425 if (slot == MCA_INTEGSCSI) {
426 printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
427 mca_dev->name);
428 } else if (slot == MCA_INTEGVIDEO) {
429 printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
430 mca_dev->name);
431 } else if (slot == MCA_MOTHERBOARD) {
432 printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
433 mca_dev->name);
434 }
435
436 /* More info available in POS 6 and 7? */
437
438 if (check_flag) {
439 unsigned char pos6, pos7;
440
441 pos6 = mca_device_read_pos(mca_dev, 6);
442 pos7 = mca_device_read_pos(mca_dev, 7);
443
444 printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
445 }
446
447} /* mca_handle_nmi_slot */
448
449/*--------------------------------------------------------------------*/
450
451static int __kprobes mca_handle_nmi_callback(struct device *dev, void *data)
452{
453 struct mca_device *mca_dev = to_mca_device(dev);
454 unsigned char pos5;
455
456 pos5 = mca_device_read_pos(mca_dev, 5);
457
458 if (!(pos5 & 0x80)) {
459 /*
460 * Bit 7 of POS 5 is reset when this adapter has a hardware
461 * error. Bit 7 it reset if there's error information
462 * available in POS 6 and 7.
463 */
464 mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
465 return 1;
466 }
467 return 0;
468}
469
470void __kprobes mca_handle_nmi(void)
471{
472 /*
473 * First try - scan the various adapters and see if a specific
474 * adapter was responsible for the error.
475 */
476 bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);
477}