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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / block / umem.c
blob4eaf97d7a1704ff8daa64fb8dc55acc4864ddccc
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mm.c - Micro Memory(tm) PCI memory board block device driver - v2.3
4 *
5 * (C) 2001 San Mehat <nettwerk@valinux.com>
6 * (C) 2001 Johannes Erdfelt <jerdfelt@valinux.com>
7 * (C) 2001 NeilBrown <neilb@cse.unsw.edu.au>
8 *
9 * This driver for the Micro Memory PCI Memory Module with Battery Backup
10 * is Copyright Micro Memory Inc 2001-2002. All rights reserved.
11 *
12 * This driver provides a standard block device interface for Micro Memory(tm)
13 * PCI based RAM boards.
14 * 10/05/01: Phap Nguyen - Rebuilt the driver
15 * 10/22/01: Phap Nguyen - v2.1 Added disk partitioning
16 * 29oct2001:NeilBrown - Use make_request_fn instead of request_fn
17 * - use stand disk partitioning (so fdisk works).
18 * 08nov2001:NeilBrown - change driver name from "mm" to "umem"
19 * - incorporate into main kernel
20 * 08apr2002:NeilBrown - Move some of interrupt handle to tasklet
21 * - use spin_lock_bh instead of _irq
22 * - Never block on make_request. queue
23 * bh's instead.
24 * - unregister umem from devfs at mod unload
25 * - Change version to 2.3
26 * 07Nov2001:Phap Nguyen - Select pci read command: 06, 12, 15 (Decimal)
27 * 07Jan2002: P. Nguyen - Used PCI Memory Write & Invalidate for DMA
28 * 15May2002:NeilBrown - convert to bio for 2.5
29 * 17May2002:NeilBrown - remove init_mem initialisation. Instead detect
30 * - a sequence of writes that cover the card, and
31 * - set initialised bit then.
32 */
33
34 #undef DEBUG /* #define DEBUG if you want debugging info (pr_debug) */
35 #include <linux/fs.h>
36 #include <linux/bio.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/mman.h>
40 #include <linux/gfp.h>
41 #include <linux/ioctl.h>
42 #include <linux/module.h>
43 #include <linux/init.h>
44 #include <linux/interrupt.h>
45 #include <linux/timer.h>
46 #include <linux/pci.h>
47 #include <linux/dma-mapping.h>
48
49 #include <linux/fcntl.h> /* O_ACCMODE */
50 #include <linux/hdreg.h> /* HDIO_GETGEO */
51
52 #include "umem.h"
53
54 #include <linux/uaccess.h>
55 #include <asm/io.h>
56
57 #define MM_MAXCARDS 4
58 #define MM_RAHEAD 2 /* two sectors */
59 #define MM_BLKSIZE 1024 /* 1k blocks */
60 #define MM_HARDSECT 512 /* 512-byte hardware sectors */
61 #define MM_SHIFT 6 /* max 64 partitions on 4 cards */
62
63 /*
64 * Version Information
65 */
66
67 #define DRIVER_NAME "umem"
68 #define DRIVER_VERSION "v2.3"
69 #define DRIVER_AUTHOR "San Mehat, Johannes Erdfelt, NeilBrown"
70 #define DRIVER_DESC "Micro Memory(tm) PCI memory board block driver"
71
72 static int debug;
73 /* #define HW_TRACE(x) writeb(x,cards[0].csr_remap + MEMCTRLSTATUS_MAGIC) */
74 #define HW_TRACE(x)
75
76 #define DEBUG_LED_ON_TRANSFER 0x01
77 #define DEBUG_BATTERY_POLLING 0x02
78
79 module_param(debug, int, 0644);
80 MODULE_PARM_DESC(debug, "Debug bitmask");
81
82 static int pci_read_cmd = 0x0C; /* Read Multiple */
83 module_param(pci_read_cmd, int, 0);
84 MODULE_PARM_DESC(pci_read_cmd, "PCI read command");
85
86 static int pci_write_cmd = 0x0F; /* Write and Invalidate */
87 module_param(pci_write_cmd, int, 0);
88 MODULE_PARM_DESC(pci_write_cmd, "PCI write command");
89
90 static int pci_cmds;
91
92 static int major_nr;
93
94 #include <linux/blkdev.h>
95 #include <linux/blkpg.h>
96
97 struct cardinfo {
98 struct pci_dev *dev;
99
100 unsigned char __iomem *csr_remap;
101 unsigned int mm_size; /* size in kbytes */
102
103 unsigned int init_size; /* initial segment, in sectors,
104 * that we know to
105 * have been written
106 */
107 struct bio *bio, *currentbio, **biotail;
108 struct bvec_iter current_iter;
109
110 struct request_queue *queue;
111
112 struct mm_page {
113 dma_addr_t page_dma;
114 struct mm_dma_desc *desc;
115 int cnt, headcnt;
116 struct bio *bio, **biotail;
117 struct bvec_iter iter;
118 } mm_pages[2];
119 #define DESC_PER_PAGE ((PAGE_SIZE*2)/sizeof(struct mm_dma_desc))
120
121 int Active, Ready;
122
123 struct tasklet_struct tasklet;
124 unsigned int dma_status;
125
126 struct {
127 int good;
128 int warned;
129 unsigned long last_change;
130 } battery[2];
131
132 spinlock_t lock;
133 int check_batteries;
134
135 int flags;
136 };
137
138 static struct cardinfo cards[MM_MAXCARDS];
139 static struct timer_list battery_timer;
140
141 static int num_cards;
142
143 static struct gendisk *mm_gendisk[MM_MAXCARDS];
144
145 static void check_batteries(struct cardinfo *card);
146
147 static int get_userbit(struct cardinfo *card, int bit)
148 {
149 unsigned char led;
150
151 led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
152 return led & bit;
153 }
154
155 static int set_userbit(struct cardinfo *card, int bit, unsigned char state)
156 {
157 unsigned char led;
158
159 led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
160 if (state)
161 led |= bit;
162 else
163 led &= ~bit;
164 writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
165
166 return 0;
167 }
168
169 /*
170 * NOTE: For the power LED, use the LED_POWER_* macros since they differ
171 */
172 static void set_led(struct cardinfo *card, int shift, unsigned char state)
173 {
174 unsigned char led;
175
176 led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
177 if (state == LED_FLIP)
178 led ^= (1<<shift);
179 else {
180 led &= ~(0x03 << shift);
181 led |= (state << shift);
182 }
183 writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
184
185 }
186
187 #ifdef MM_DIAG
188 static void dump_regs(struct cardinfo *card)
189 {
190 unsigned char *p;
191 int i, i1;
192
193 p = card->csr_remap;
194 for (i = 0; i < 8; i++) {
195 printk(KERN_DEBUG "%p ", p);
196
197 for (i1 = 0; i1 < 16; i1++)
198 printk("%02x ", *p++);
199
200 printk("\n");
201 }
202 }
203 #endif
204
205 static void dump_dmastat(struct cardinfo *card, unsigned int dmastat)
206 {
207 dev_printk(KERN_DEBUG, &card->dev->dev, "DMAstat - ");
208 if (dmastat & DMASCR_ANY_ERR)
209 printk(KERN_CONT "ANY_ERR ");
210 if (dmastat & DMASCR_MBE_ERR)
211 printk(KERN_CONT "MBE_ERR ");
212 if (dmastat & DMASCR_PARITY_ERR_REP)
213 printk(KERN_CONT "PARITY_ERR_REP ");
214 if (dmastat & DMASCR_PARITY_ERR_DET)
215 printk(KERN_CONT "PARITY_ERR_DET ");
216 if (dmastat & DMASCR_SYSTEM_ERR_SIG)
217 printk(KERN_CONT "SYSTEM_ERR_SIG ");
218 if (dmastat & DMASCR_TARGET_ABT)
219 printk(KERN_CONT "TARGET_ABT ");
220 if (dmastat & DMASCR_MASTER_ABT)
221 printk(KERN_CONT "MASTER_ABT ");
222 if (dmastat & DMASCR_CHAIN_COMPLETE)
223 printk(KERN_CONT "CHAIN_COMPLETE ");
224 if (dmastat & DMASCR_DMA_COMPLETE)
225 printk(KERN_CONT "DMA_COMPLETE ");
226 printk("\n");
227 }
228
229 /*
230 * Theory of request handling
231 *
232 * Each bio is assigned to one mm_dma_desc - which may not be enough FIXME
233 * We have two pages of mm_dma_desc, holding about 64 descriptors
234 * each. These are allocated at init time.
235 * One page is "Ready" and is either full, or can have request added.
236 * The other page might be "Active", which DMA is happening on it.
237 *
238 * Whenever IO on the active page completes, the Ready page is activated
239 * and the ex-Active page is clean out and made Ready.
240 * Otherwise the Ready page is only activated when it becomes full.
241 *
242 * If a request arrives while both pages a full, it is queued, and b_rdev is
243 * overloaded to record whether it was a read or a write.
244 *
245 * The interrupt handler only polls the device to clear the interrupt.
246 * The processing of the result is done in a tasklet.
247 */
248
249 static void mm_start_io(struct cardinfo *card)
250 {
251 /* we have the lock, we know there is
252 * no IO active, and we know that card->Active
253 * is set
254 */
255 struct mm_dma_desc *desc;
256 struct mm_page *page;
257 int offset;
258
259 /* make the last descriptor end the chain */
260 page = &card->mm_pages[card->Active];
261 pr_debug("start_io: %d %d->%d\n",
262 card->Active, page->headcnt, page->cnt - 1);
263 desc = &page->desc[page->cnt-1];
264
265 desc->control_bits |= cpu_to_le32(DMASCR_CHAIN_COMP_EN);
266 desc->control_bits &= ~cpu_to_le32(DMASCR_CHAIN_EN);
267 desc->sem_control_bits = desc->control_bits;
268
269
270 if (debug & DEBUG_LED_ON_TRANSFER)
271 set_led(card, LED_REMOVE, LED_ON);
272
273 desc = &page->desc[page->headcnt];
274 writel(0, card->csr_remap + DMA_PCI_ADDR);
275 writel(0, card->csr_remap + DMA_PCI_ADDR + 4);
276
277 writel(0, card->csr_remap + DMA_LOCAL_ADDR);
278 writel(0, card->csr_remap + DMA_LOCAL_ADDR + 4);
279
280 writel(0, card->csr_remap + DMA_TRANSFER_SIZE);
281 writel(0, card->csr_remap + DMA_TRANSFER_SIZE + 4);
282
283 writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR);
284 writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR + 4);
285
286 offset = ((char *)desc) - ((char *)page->desc);
287 writel(cpu_to_le32((page->page_dma+offset) & 0xffffffff),
288 card->csr_remap + DMA_DESCRIPTOR_ADDR);
289 /* Force the value to u64 before shifting otherwise >> 32 is undefined C
290 * and on some ports will do nothing ! */
291 writel(cpu_to_le32(((u64)page->page_dma)>>32),
292 card->csr_remap + DMA_DESCRIPTOR_ADDR + 4);
293
294 /* Go, go, go */
295 writel(cpu_to_le32(DMASCR_GO | DMASCR_CHAIN_EN | pci_cmds),
296 card->csr_remap + DMA_STATUS_CTRL);
297 }
298
299 static int add_bio(struct cardinfo *card);
300
301 static void activate(struct cardinfo *card)
302 {
303 /* if No page is Active, and Ready is
304 * not empty, then switch Ready page
305 * to active and start IO.
306 * Then add any bh's that are available to Ready
307 */
308
309 do {
310 while (add_bio(card))
311 ;
312
313 if (card->Active == -1 &&
314 card->mm_pages[card->Ready].cnt > 0) {
315 card->Active = card->Ready;
316 card->Ready = 1-card->Ready;
317 mm_start_io(card);
318 }
319
320 } while (card->Active == -1 && add_bio(card));
321 }
322
323 static inline void reset_page(struct mm_page *page)
324 {
325 page->cnt = 0;
326 page->headcnt = 0;
327 page->bio = NULL;
328 page->biotail = &page->bio;
329 }
330
331 /*
332 * If there is room on Ready page, take
333 * one bh off list and add it.
334 * return 1 if there was room, else 0.
335 */
336 static int add_bio(struct cardinfo *card)
337 {
338 struct mm_page *p;
339 struct mm_dma_desc *desc;
340 dma_addr_t dma_handle;
341 int offset;
342 struct bio *bio;
343 struct bio_vec vec;
344
345 bio = card->currentbio;
346 if (!bio && card->bio) {
347 card->currentbio = card->bio;
348 card->current_iter = card->bio->bi_iter;
349 card->bio = card->bio->bi_next;
350 if (card->bio == NULL)
351 card->biotail = &card->bio;
352 card->currentbio->bi_next = NULL;
353 return 1;
354 }
355 if (!bio)
356 return 0;
357
358 if (card->mm_pages[card->Ready].cnt >= DESC_PER_PAGE)
359 return 0;
360
361 vec = bio_iter_iovec(bio, card->current_iter);
362
363 dma_handle = dma_map_page(&card->dev->dev,
364 vec.bv_page,
365 vec.bv_offset,
366 vec.bv_len,
367 bio_op(bio) == REQ_OP_READ ?
368 DMA_FROM_DEVICE : DMA_TO_DEVICE);
369
370 p = &card->mm_pages[card->Ready];
371 desc = &p->desc[p->cnt];
372 p->cnt++;
373 if (p->bio == NULL)
374 p->iter = card->current_iter;
375 if ((p->biotail) != &bio->bi_next) {
376 *(p->biotail) = bio;
377 p->biotail = &(bio->bi_next);
378 bio->bi_next = NULL;
379 }
380
381 desc->data_dma_handle = dma_handle;
382
383 desc->pci_addr = cpu_to_le64((u64)desc->data_dma_handle);
384 desc->local_addr = cpu_to_le64(card->current_iter.bi_sector << 9);
385 desc->transfer_size = cpu_to_le32(vec.bv_len);
386 offset = (((char *)&desc->sem_control_bits) - ((char *)p->desc));
387 desc->sem_addr = cpu_to_le64((u64)(p->page_dma+offset));
388 desc->zero1 = desc->zero2 = 0;
389 offset = (((char *)(desc+1)) - ((char *)p->desc));
390 desc->next_desc_addr = cpu_to_le64(p->page_dma+offset);
391 desc->control_bits = cpu_to_le32(DMASCR_GO|DMASCR_ERR_INT_EN|
392 DMASCR_PARITY_INT_EN|
393 DMASCR_CHAIN_EN |
394 DMASCR_SEM_EN |
395 pci_cmds);
396 if (bio_op(bio) == REQ_OP_WRITE)
397 desc->control_bits |= cpu_to_le32(DMASCR_TRANSFER_READ);
398 desc->sem_control_bits = desc->control_bits;
399
400
401 bio_advance_iter(bio, &card->current_iter, vec.bv_len);
402 if (!card->current_iter.bi_size)
403 card->currentbio = NULL;
404
405 return 1;
406 }
407
408 static void process_page(unsigned long data)
409 {
410 /* check if any of the requests in the page are DMA_COMPLETE,
411 * and deal with them appropriately.
412 * If we find a descriptor without DMA_COMPLETE in the semaphore, then
413 * dma must have hit an error on that descriptor, so use dma_status
414 * instead and assume that all following descriptors must be re-tried.
415 */
416 struct mm_page *page;
417 struct bio *return_bio = NULL;
418 struct cardinfo *card = (struct cardinfo *)data;
419 unsigned int dma_status = card->dma_status;
420
421 spin_lock(&card->lock);
422 if (card->Active < 0)
423 goto out_unlock;
424 page = &card->mm_pages[card->Active];
425
426 while (page->headcnt < page->cnt) {
427 struct bio *bio = page->bio;
428 struct mm_dma_desc *desc = &page->desc[page->headcnt];
429 int control = le32_to_cpu(desc->sem_control_bits);
430 int last = 0;
431 struct bio_vec vec;
432
433 if (!(control & DMASCR_DMA_COMPLETE)) {
434 control = dma_status;
435 last = 1;
436 }
437
438 page->headcnt++;
439 vec = bio_iter_iovec(bio, page->iter);
440 bio_advance_iter(bio, &page->iter, vec.bv_len);
441
442 if (!page->iter.bi_size) {
443 page->bio = bio->bi_next;
444 if (page->bio)
445 page->iter = page->bio->bi_iter;
446 }
447
448 dma_unmap_page(&card->dev->dev, desc->data_dma_handle,
449 vec.bv_len,
450 (control & DMASCR_TRANSFER_READ) ?
451 DMA_TO_DEVICE : DMA_FROM_DEVICE);
452 if (control & DMASCR_HARD_ERROR) {
453 /* error */
454 bio->bi_status = BLK_STS_IOERR;
455 dev_printk(KERN_WARNING, &card->dev->dev,
456 "I/O error on sector %d/%d\n",
457 le32_to_cpu(desc->local_addr)>>9,
458 le32_to_cpu(desc->transfer_size));
459 dump_dmastat(card, control);
460 } else if (op_is_write(bio_op(bio)) &&
461 le32_to_cpu(desc->local_addr) >> 9 ==
462 card->init_size) {
463 card->init_size += le32_to_cpu(desc->transfer_size) >> 9;
464 if (card->init_size >> 1 >= card->mm_size) {
465 dev_printk(KERN_INFO, &card->dev->dev,
466 "memory now initialised\n");
467 set_userbit(card, MEMORY_INITIALIZED, 1);
468 }
469 }
470 if (bio != page->bio) {
471 bio->bi_next = return_bio;
472 return_bio = bio;
473 }
474
475 if (last)
476 break;
477 }
478
479 if (debug & DEBUG_LED_ON_TRANSFER)
480 set_led(card, LED_REMOVE, LED_OFF);
481
482 if (card->check_batteries) {
483 card->check_batteries = 0;
484 check_batteries(card);
485 }
486 if (page->headcnt >= page->cnt) {
487 reset_page(page);
488 card->Active = -1;
489 activate(card);
490 } else {
491 /* haven't finished with this one yet */
492 pr_debug("do some more\n");
493 mm_start_io(card);
494 }
495 out_unlock:
496 spin_unlock(&card->lock);
497
498 while (return_bio) {
499 struct bio *bio = return_bio;
500
501 return_bio = bio->bi_next;
502 bio->bi_next = NULL;
503 bio_endio(bio);
504 }
505 }
506
507 static void mm_unplug(struct blk_plug_cb *cb, bool from_schedule)
508 {
509 struct cardinfo *card = cb->data;
510
511 spin_lock_irq(&card->lock);
512 activate(card);
513 spin_unlock_irq(&card->lock);
514 kfree(cb);
515 }
516
517 static int mm_check_plugged(struct cardinfo *card)
518 {
519 return !!blk_check_plugged(mm_unplug, card, sizeof(struct blk_plug_cb));
520 }
521
522 static blk_qc_t mm_make_request(struct request_queue *q, struct bio *bio)
523 {
524 struct cardinfo *card = q->queuedata;
525 pr_debug("mm_make_request %llu %u\n",
526 (unsigned long long)bio->bi_iter.bi_sector,
527 bio->bi_iter.bi_size);
528
529 blk_queue_split(q, &bio);
530
531 spin_lock_irq(&card->lock);
532 *card->biotail = bio;
533 bio->bi_next = NULL;
534 card->biotail = &bio->bi_next;
535 if (op_is_sync(bio->bi_opf) || !mm_check_plugged(card))
536 activate(card);
537 spin_unlock_irq(&card->lock);
538
539 return BLK_QC_T_NONE;
540 }
541
542 static irqreturn_t mm_interrupt(int irq, void *__card)
543 {
544 struct cardinfo *card = (struct cardinfo *) __card;
545 unsigned int dma_status;
546 unsigned short cfg_status;
547
548 HW_TRACE(0x30);
549
550 dma_status = le32_to_cpu(readl(card->csr_remap + DMA_STATUS_CTRL));
551
552 if (!(dma_status & (DMASCR_ERROR_MASK | DMASCR_CHAIN_COMPLETE))) {
553 /* interrupt wasn't for me ... */
554 return IRQ_NONE;
555 }
556
557 /* clear COMPLETION interrupts */
558 if (card->flags & UM_FLAG_NO_BYTE_STATUS)
559 writel(cpu_to_le32(DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE),
560 card->csr_remap + DMA_STATUS_CTRL);
561 else
562 writeb((DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE) >> 16,
563 card->csr_remap + DMA_STATUS_CTRL + 2);
564
565 /* log errors and clear interrupt status */
566 if (dma_status & DMASCR_ANY_ERR) {
567 unsigned int data_log1, data_log2;
568 unsigned int addr_log1, addr_log2;
569 unsigned char stat, count, syndrome, check;
570
571 stat = readb(card->csr_remap + MEMCTRLCMD_ERRSTATUS);
572
573 data_log1 = le32_to_cpu(readl(card->csr_remap +
574 ERROR_DATA_LOG));
575 data_log2 = le32_to_cpu(readl(card->csr_remap +
576 ERROR_DATA_LOG + 4));
577 addr_log1 = le32_to_cpu(readl(card->csr_remap +
578 ERROR_ADDR_LOG));
579 addr_log2 = readb(card->csr_remap + ERROR_ADDR_LOG + 4);
580
581 count = readb(card->csr_remap + ERROR_COUNT);
582 syndrome = readb(card->csr_remap + ERROR_SYNDROME);
583 check = readb(card->csr_remap + ERROR_CHECK);
584
585 dump_dmastat(card, dma_status);
586
587 if (stat & 0x01)
588 dev_printk(KERN_ERR, &card->dev->dev,
589 "Memory access error detected (err count %d)\n",
590 count);
591 if (stat & 0x02)
592 dev_printk(KERN_ERR, &card->dev->dev,
593 "Multi-bit EDC error\n");
594
595 dev_printk(KERN_ERR, &card->dev->dev,
596 "Fault Address 0x%02x%08x, Fault Data 0x%08x%08x\n",
597 addr_log2, addr_log1, data_log2, data_log1);
598 dev_printk(KERN_ERR, &card->dev->dev,
599 "Fault Check 0x%02x, Fault Syndrome 0x%02x\n",
600 check, syndrome);
601
602 writeb(0, card->csr_remap + ERROR_COUNT);
603 }
604
605 if (dma_status & DMASCR_PARITY_ERR_REP) {
606 dev_printk(KERN_ERR, &card->dev->dev,
607 "PARITY ERROR REPORTED\n");
608 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
609 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
610 }
611
612 if (dma_status & DMASCR_PARITY_ERR_DET) {
613 dev_printk(KERN_ERR, &card->dev->dev,
614 "PARITY ERROR DETECTED\n");
615 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
616 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
617 }
618
619 if (dma_status & DMASCR_SYSTEM_ERR_SIG) {
620 dev_printk(KERN_ERR, &card->dev->dev, "SYSTEM ERROR\n");
621 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
622 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
623 }
624
625 if (dma_status & DMASCR_TARGET_ABT) {
626 dev_printk(KERN_ERR, &card->dev->dev, "TARGET ABORT\n");
627 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
628 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
629 }
630
631 if (dma_status & DMASCR_MASTER_ABT) {
632 dev_printk(KERN_ERR, &card->dev->dev, "MASTER ABORT\n");
633 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
634 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
635 }
636
637 /* and process the DMA descriptors */
638 card->dma_status = dma_status;
639 tasklet_schedule(&card->tasklet);
640
641 HW_TRACE(0x36);
642
643 return IRQ_HANDLED;
644 }
645
646 /*
647 * If both batteries are good, no LED
648 * If either battery has been warned, solid LED
649 * If both batteries are bad, flash the LED quickly
650 * If either battery is bad, flash the LED semi quickly
651 */
652 static void set_fault_to_battery_status(struct cardinfo *card)
653 {
654 if (card->battery[0].good && card->battery[1].good)
655 set_led(card, LED_FAULT, LED_OFF);
656 else if (card->battery[0].warned || card->battery[1].warned)
657 set_led(card, LED_FAULT, LED_ON);
658 else if (!card->battery[0].good && !card->battery[1].good)
659 set_led(card, LED_FAULT, LED_FLASH_7_0);
660 else
661 set_led(card, LED_FAULT, LED_FLASH_3_5);
662 }
663
664 static void init_battery_timer(void);
665
666 static int check_battery(struct cardinfo *card, int battery, int status)
667 {
668 if (status != card->battery[battery].good) {
669 card->battery[battery].good = !card->battery[battery].good;
670 card->battery[battery].last_change = jiffies;
671
672 if (card->battery[battery].good) {
673 dev_printk(KERN_ERR, &card->dev->dev,
674 "Battery %d now good\n", battery + 1);
675 card->battery[battery].warned = 0;
676 } else
677 dev_printk(KERN_ERR, &card->dev->dev,
678 "Battery %d now FAILED\n", battery + 1);
679
680 return 1;
681 } else if (!card->battery[battery].good &&
682 !card->battery[battery].warned &&
683 time_after_eq(jiffies, card->battery[battery].last_change +
684 (HZ * 60 * 60 * 5))) {
685 dev_printk(KERN_ERR, &card->dev->dev,
686 "Battery %d still FAILED after 5 hours\n", battery + 1);
687 card->battery[battery].warned = 1;
688
689 return 1;
690 }
691
692 return 0;
693 }
694
695 static void check_batteries(struct cardinfo *card)
696 {
697 /* NOTE: this must *never* be called while the card
698 * is doing (bus-to-card) DMA, or you will need the
699 * reset switch
700 */
701 unsigned char status;
702 int ret1, ret2;
703
704 status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
705 if (debug & DEBUG_BATTERY_POLLING)
706 dev_printk(KERN_DEBUG, &card->dev->dev,
707 "checking battery status, 1 = %s, 2 = %s\n",
708 (status & BATTERY_1_FAILURE) ? "FAILURE" : "OK",
709 (status & BATTERY_2_FAILURE) ? "FAILURE" : "OK");
710
711 ret1 = check_battery(card, 0, !(status & BATTERY_1_FAILURE));
712 ret2 = check_battery(card, 1, !(status & BATTERY_2_FAILURE));
713
714 if (ret1 || ret2)
715 set_fault_to_battery_status(card);
716 }
717
718 static void check_all_batteries(struct timer_list *unused)
719 {
720 int i;
721
722 for (i = 0; i < num_cards; i++)
723 if (!(cards[i].flags & UM_FLAG_NO_BATT)) {
724 struct cardinfo *card = &cards[i];
725 spin_lock_bh(&card->lock);
726 if (card->Active >= 0)
727 card->check_batteries = 1;
728 else
729 check_batteries(card);
730 spin_unlock_bh(&card->lock);
731 }
732
733 init_battery_timer();
734 }
735
736 static void init_battery_timer(void)
737 {
738 timer_setup(&battery_timer, check_all_batteries, 0);
739 battery_timer.expires = jiffies + (HZ * 60);
740 add_timer(&battery_timer);
741 }
742
743 static void del_battery_timer(void)
744 {
745 del_timer(&battery_timer);
746 }
747
748 /*
749 * Note no locks taken out here. In a worst case scenario, we could drop
750 * a chunk of system memory. But that should never happen, since validation
751 * happens at open or mount time, when locks are held.
752 *
753 * That's crap, since doing that while some partitions are opened
754 * or mounted will give you really nasty results.
755 */
756 static int mm_revalidate(struct gendisk *disk)
757 {
758 struct cardinfo *card = disk->private_data;
759 set_capacity(disk, card->mm_size << 1);
760 return 0;
761 }
762
763 static int mm_getgeo(struct block_device *bdev, struct hd_geometry *geo)
764 {
765 struct cardinfo *card = bdev->bd_disk->private_data;
766 int size = card->mm_size * (1024 / MM_HARDSECT);
767
768 /*
769 * get geometry: we have to fake one... trim the size to a
770 * multiple of 2048 (1M): tell we have 32 sectors, 64 heads,
771 * whatever cylinders.
772 */
773 geo->heads = 64;
774 geo->sectors = 32;
775 geo->cylinders = size / (geo->heads * geo->sectors);
776 return 0;
777 }
778
779 static const struct block_device_operations mm_fops = {
780 .owner = THIS_MODULE,
781 .getgeo = mm_getgeo,
782 .revalidate_disk = mm_revalidate,
783 };
784
785 static int mm_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
786 {
787 int ret = -ENODEV;
788 struct cardinfo *card = &cards[num_cards];
789 unsigned char mem_present;
790 unsigned char batt_status;
791 unsigned int saved_bar, data;
792 unsigned long csr_base;
793 unsigned long csr_len;
794 int magic_number;
795 static int printed_version;
796
797 if (!printed_version++)
798 printk(KERN_INFO DRIVER_VERSION " : " DRIVER_DESC "\n");
799
800 ret = pci_enable_device(dev);
801 if (ret)
802 return ret;
803
804 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xF8);
805 pci_set_master(dev);
806
807 card->dev = dev;
808
809 csr_base = pci_resource_start(dev, 0);
810 csr_len = pci_resource_len(dev, 0);
811 if (!csr_base || !csr_len)
812 return -ENODEV;
813
814 dev_printk(KERN_INFO, &dev->dev,
815 "Micro Memory(tm) controller found (PCI Mem Module (Battery Backup))\n");
816
817 if (dma_set_mask(&dev->dev, DMA_BIT_MASK(64)) &&
818 dma_set_mask(&dev->dev, DMA_BIT_MASK(32))) {
819 dev_printk(KERN_WARNING, &dev->dev, "NO suitable DMA found\n");
820 return -ENOMEM;
821 }
822
823 ret = pci_request_regions(dev, DRIVER_NAME);
824 if (ret) {
825 dev_printk(KERN_ERR, &card->dev->dev,
826 "Unable to request memory region\n");
827 goto failed_req_csr;
828 }
829
830 card->csr_remap = ioremap(csr_base, csr_len);
831 if (!card->csr_remap) {
832 dev_printk(KERN_ERR, &card->dev->dev,
833 "Unable to remap memory region\n");
834 ret = -ENOMEM;
835
836 goto failed_remap_csr;
837 }
838
839 dev_printk(KERN_INFO, &card->dev->dev,
840 "CSR 0x%08lx -> 0x%p (0x%lx)\n",
841 csr_base, card->csr_remap, csr_len);
842
843 switch (card->dev->device) {
844 case 0x5415:
845 card->flags |= UM_FLAG_NO_BYTE_STATUS | UM_FLAG_NO_BATTREG;
846 magic_number = 0x59;
847 break;
848
849 case 0x5425:
850 card->flags |= UM_FLAG_NO_BYTE_STATUS;
851 magic_number = 0x5C;
852 break;
853
854 case 0x6155:
855 card->flags |= UM_FLAG_NO_BYTE_STATUS |
856 UM_FLAG_NO_BATTREG | UM_FLAG_NO_BATT;
857 magic_number = 0x99;
858 break;
859
860 default:
861 magic_number = 0x100;
862 break;
863 }
864
865 if (readb(card->csr_remap + MEMCTRLSTATUS_MAGIC) != magic_number) {
866 dev_printk(KERN_ERR, &card->dev->dev, "Magic number invalid\n");
867 ret = -ENOMEM;
868 goto failed_magic;
869 }
870
871 card->mm_pages[0].desc = dma_alloc_coherent(&card->dev->dev,
872 PAGE_SIZE * 2, &card->mm_pages[0].page_dma, GFP_KERNEL);
873 card->mm_pages[1].desc = dma_alloc_coherent(&card->dev->dev,
874 PAGE_SIZE * 2, &card->mm_pages[1].page_dma, GFP_KERNEL);
875 if (card->mm_pages[0].desc == NULL ||
876 card->mm_pages[1].desc == NULL) {
877 dev_printk(KERN_ERR, &card->dev->dev, "alloc failed\n");
878 goto failed_alloc;
879 }
880 reset_page(&card->mm_pages[0]);
881 reset_page(&card->mm_pages[1]);
882 card->Ready = 0; /* page 0 is ready */
883 card->Active = -1; /* no page is active */
884 card->bio = NULL;
885 card->biotail = &card->bio;
886 spin_lock_init(&card->lock);
887
888 card->queue = blk_alloc_queue_node(GFP_KERNEL, NUMA_NO_NODE);
889 if (!card->queue)
890 goto failed_alloc;
891
892 blk_queue_make_request(card->queue, mm_make_request);
893 card->queue->queuedata = card;
894
895 tasklet_init(&card->tasklet, process_page, (unsigned long)card);
896
897 card->check_batteries = 0;
898
899 mem_present = readb(card->csr_remap + MEMCTRLSTATUS_MEMORY);
900 switch (mem_present) {
901 case MEM_128_MB:
902 card->mm_size = 1024 * 128;
903 break;
904 case MEM_256_MB:
905 card->mm_size = 1024 * 256;
906 break;
907 case MEM_512_MB:
908 card->mm_size = 1024 * 512;
909 break;
910 case MEM_1_GB:
911 card->mm_size = 1024 * 1024;
912 break;
913 case MEM_2_GB:
914 card->mm_size = 1024 * 2048;
915 break;
916 default:
917 card->mm_size = 0;
918 break;
919 }
920
921 /* Clear the LED's we control */
922 set_led(card, LED_REMOVE, LED_OFF);
923 set_led(card, LED_FAULT, LED_OFF);
924
925 batt_status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
926
927 card->battery[0].good = !(batt_status & BATTERY_1_FAILURE);
928 card->battery[1].good = !(batt_status & BATTERY_2_FAILURE);
929 card->battery[0].last_change = card->battery[1].last_change = jiffies;
930
931 if (card->flags & UM_FLAG_NO_BATT)
932 dev_printk(KERN_INFO, &card->dev->dev,
933 "Size %d KB\n", card->mm_size);
934 else {
935 dev_printk(KERN_INFO, &card->dev->dev,
936 "Size %d KB, Battery 1 %s (%s), Battery 2 %s (%s)\n",
937 card->mm_size,
938 batt_status & BATTERY_1_DISABLED ? "Disabled" : "Enabled",
939 card->battery[0].good ? "OK" : "FAILURE",
940 batt_status & BATTERY_2_DISABLED ? "Disabled" : "Enabled",
941 card->battery[1].good ? "OK" : "FAILURE");
942
943 set_fault_to_battery_status(card);
944 }
945
946 pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &saved_bar);
947 data = 0xffffffff;
948 pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, data);
949 pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &data);
950 pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, saved_bar);
951 data &= 0xfffffff0;
952 data = ~data;
953 data += 1;
954
955 if (request_irq(dev->irq, mm_interrupt, IRQF_SHARED, DRIVER_NAME,
956 card)) {
957 dev_printk(KERN_ERR, &card->dev->dev,
958 "Unable to allocate IRQ\n");
959 ret = -ENODEV;
960 goto failed_req_irq;
961 }
962
963 dev_printk(KERN_INFO, &card->dev->dev,
964 "Window size %d bytes, IRQ %d\n", data, dev->irq);
965
966 pci_set_drvdata(dev, card);
967
968 if (pci_write_cmd != 0x0F) /* If not Memory Write & Invalidate */
969 pci_write_cmd = 0x07; /* then Memory Write command */
970
971 if (pci_write_cmd & 0x08) { /* use Memory Write and Invalidate */
972 unsigned short cfg_command;
973 pci_read_config_word(dev, PCI_COMMAND, &cfg_command);
974 cfg_command |= 0x10; /* Memory Write & Invalidate Enable */
975 pci_write_config_word(dev, PCI_COMMAND, cfg_command);
976 }
977 pci_cmds = (pci_read_cmd << 28) | (pci_write_cmd << 24);
978
979 num_cards++;
980
981 if (!get_userbit(card, MEMORY_INITIALIZED)) {
982 dev_printk(KERN_INFO, &card->dev->dev,
983 "memory NOT initialized. Consider over-writing whole device.\n");
984 card->init_size = 0;
985 } else {
986 dev_printk(KERN_INFO, &card->dev->dev,
987 "memory already initialized\n");
988 card->init_size = card->mm_size;
989 }
990
991 /* Enable ECC */
992 writeb(EDC_STORE_CORRECT, card->csr_remap + MEMCTRLCMD_ERRCTRL);
993
994 return 0;
995
996 failed_req_irq:
997 failed_alloc:
998 if (card->mm_pages[0].desc)
999 dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2,
1000 card->mm_pages[0].desc,
1001 card->mm_pages[0].page_dma);
1002 if (card->mm_pages[1].desc)
1003 dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2,
1004 card->mm_pages[1].desc,
1005 card->mm_pages[1].page_dma);
1006 failed_magic:
1007 iounmap(card->csr_remap);
1008 failed_remap_csr:
1009 pci_release_regions(dev);
1010 failed_req_csr:
1011
1012 return ret;
1013 }
1014
1015 static void mm_pci_remove(struct pci_dev *dev)
1016 {
1017 struct cardinfo *card = pci_get_drvdata(dev);
1018
1019 tasklet_kill(&card->tasklet);
1020 free_irq(dev->irq, card);
1021 iounmap(card->csr_remap);
1022
1023 if (card->mm_pages[0].desc)
1024 dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2,
1025 card->mm_pages[0].desc,
1026 card->mm_pages[0].page_dma);
1027 if (card->mm_pages[1].desc)
1028 dma_free_coherent(&card->dev->dev, PAGE_SIZE * 2,
1029 card->mm_pages[1].desc,
1030 card->mm_pages[1].page_dma);
1031 blk_cleanup_queue(card->queue);
1032
1033 pci_release_regions(dev);
1034 pci_disable_device(dev);
1035 }
1036
1037 static const struct pci_device_id mm_pci_ids[] = {
1038 {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_5415CN)},
1039 {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_5425CN)},
1040 {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_6155)},
1041 {
1042 .vendor = 0x8086,
1043 .device = 0xB555,
1044 .subvendor = 0x1332,
1045 .subdevice = 0x5460,
1046 .class = 0x050000,
1047 .class_mask = 0,
1048 }, { /* end: all zeroes */ }
1049 };
1050
1051 MODULE_DEVICE_TABLE(pci, mm_pci_ids);
1052
1053 static struct pci_driver mm_pci_driver = {
1054 .name = DRIVER_NAME,
1055 .id_table = mm_pci_ids,
1056 .probe = mm_pci_probe,
1057 .remove = mm_pci_remove,
1058 };
1059
1060 static int __init mm_init(void)
1061 {
1062 int retval, i;
1063 int err;
1064
1065 retval = pci_register_driver(&mm_pci_driver);
1066 if (retval)
1067 return -ENOMEM;
1068
1069 err = major_nr = register_blkdev(0, DRIVER_NAME);
1070 if (err < 0) {
1071 pci_unregister_driver(&mm_pci_driver);
1072 return -EIO;
1073 }
1074
1075 for (i = 0; i < num_cards; i++) {
1076 mm_gendisk[i] = alloc_disk(1 << MM_SHIFT);
1077 if (!mm_gendisk[i])
1078 goto out;
1079 }
1080
1081 for (i = 0; i < num_cards; i++) {
1082 struct gendisk *disk = mm_gendisk[i];
1083 sprintf(disk->disk_name, "umem%c", 'a'+i);
1084 spin_lock_init(&cards[i].lock);
1085 disk->major = major_nr;
1086 disk->first_minor = i << MM_SHIFT;
1087 disk->fops = &mm_fops;
1088 disk->private_data = &cards[i];
1089 disk->queue = cards[i].queue;
1090 set_capacity(disk, cards[i].mm_size << 1);
1091 add_disk(disk);
1092 }
1093
1094 init_battery_timer();
1095 printk(KERN_INFO "MM: desc_per_page = %ld\n", DESC_PER_PAGE);
1096 /* printk("mm_init: Done. 10-19-01 9:00\n"); */
1097 return 0;
1098
1099 out:
1100 pci_unregister_driver(&mm_pci_driver);
1101 unregister_blkdev(major_nr, DRIVER_NAME);
1102 while (i--)
1103 put_disk(mm_gendisk[i]);
1104 return -ENOMEM;
1105 }
1106
1107 static void __exit mm_cleanup(void)
1108 {
1109 int i;
1110
1111 del_battery_timer();
1112
1113 for (i = 0; i < num_cards ; i++) {
1114 del_gendisk(mm_gendisk[i]);
1115 put_disk(mm_gendisk[i]);
1116 }
1117
1118 pci_unregister_driver(&mm_pci_driver);
1119
1120 unregister_blkdev(major_nr, DRIVER_NAME);
1121 }
1122
1123 module_init(mm_init);
1124 module_exit(mm_cleanup);
1125
1126 MODULE_AUTHOR(DRIVER_AUTHOR);
1127 MODULE_DESCRIPTION(DRIVER_DESC);
1128 MODULE_LICENSE("GPL");
Linux with added FPC-III support