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Root/drivers/block/umem.c

1	/*
2	* mm.c - Micro Memory(tm) PCI memory board block device driver - v2.3
3	*
4	* (C) 2001 San Mehat <nettwerk@valinux.com>
5	* (C) 2001 Johannes Erdfelt <jerdfelt@valinux.com>
6	* (C) 2001 NeilBrown <neilb@cse.unsw.edu.au>
7	*
8	* This driver for the Micro Memory PCI Memory Module with Battery Backup
9	* is Copyright Micro Memory Inc 2001-2002. All rights reserved.
10	*
11	* This driver is released to the public under the terms of the
12	* GNU GENERAL PUBLIC LICENSE version 2
13	* See the file COPYING for details.
14	*
15	* This driver provides a standard block device interface for Micro Memory(tm)
16	* PCI based RAM boards.
17	* 10/05/01: Phap Nguyen - Rebuilt the driver
18	* 10/22/01: Phap Nguyen - v2.1 Added disk partitioning
19	* 29oct2001:NeilBrown - Use make_request_fn instead of request_fn
20	* - use stand disk partitioning (so fdisk works).
21	* 08nov2001:NeilBrown - change driver name from "mm" to "umem"
22	* - incorporate into main kernel
23	* 08apr2002:NeilBrown - Move some of interrupt handle to tasklet
24	* - use spin_lock_bh instead of _irq
25	* - Never block on make_request. queue
26	* bh's instead.
27	* - unregister umem from devfs at mod unload
28	* - Change version to 2.3
29	* 07Nov2001:Phap Nguyen - Select pci read command: 06, 12, 15 (Decimal)
30	* 07Jan2002: P. Nguyen - Used PCI Memory Write & Invalidate for DMA
31	* 15May2002:NeilBrown - convert to bio for 2.5
32	* 17May2002:NeilBrown - remove init_mem initialisation. Instead detect
33	* - a sequence of writes that cover the card, and
34	* - set initialised bit then.
35	*/
36
37	#undef DEBUG /* #define DEBUG if you want debugging info (pr_debug) */
38	#include <linux/fs.h>
39	#include <linux/bio.h>
40	#include <linux/kernel.h>
41	#include <linux/mm.h>
42	#include <linux/mman.h>
43	#include <linux/gfp.h>
44	#include <linux/ioctl.h>
45	#include <linux/module.h>
46	#include <linux/init.h>
47	#include <linux/interrupt.h>
48	#include <linux/timer.h>
49	#include <linux/pci.h>
50	#include <linux/dma-mapping.h>
51
52	#include <linux/fcntl.h> /* O_ACCMODE */
53	#include <linux/hdreg.h> /* HDIO_GETGEO */
54
55	#include "umem.h"
56
57	#include <asm/uaccess.h>
58	#include <asm/io.h>
59
60	#define MM_MAXCARDS 4
61	#define MM_RAHEAD 2 /* two sectors */
62	#define MM_BLKSIZE 1024 /* 1k blocks */
63	#define MM_HARDSECT 512 /* 512-byte hardware sectors */
64	#define MM_SHIFT 6 /* max 64 partitions on 4 cards */
65
66	/*
67	* Version Information
68	*/
69
70	#define DRIVER_NAME "umem"
71	#define DRIVER_VERSION "v2.3"
72	#define DRIVER_AUTHOR "San Mehat, Johannes Erdfelt, NeilBrown"
73	#define DRIVER_DESC "Micro Memory(tm) PCI memory board block driver"
74
75	static int debug;
76	/* #define HW_TRACE(x) writeb(x,cards[0].csr_remap + MEMCTRLSTATUS_MAGIC) */
77	#define HW_TRACE(x)
78
79	#define DEBUG_LED_ON_TRANSFER 0x01
80	#define DEBUG_BATTERY_POLLING 0x02
81
82	module_param(debug, int, 0644);
83	MODULE_PARM_DESC(debug, "Debug bitmask");
84
85	static int pci_read_cmd = 0x0C; /* Read Multiple */
86	module_param(pci_read_cmd, int, 0);
87	MODULE_PARM_DESC(pci_read_cmd, "PCI read command");
88
89	static int pci_write_cmd = 0x0F; /* Write and Invalidate */
90	module_param(pci_write_cmd, int, 0);
91	MODULE_PARM_DESC(pci_write_cmd, "PCI write command");
92
93	static int pci_cmds;
94
95	static int major_nr;
96
97	#include <linux/blkdev.h>
98	#include <linux/blkpg.h>
99
100	struct cardinfo {
101	struct pci_dev *dev;
102
103	unsigned char __iomem *csr_remap;
104	unsigned int mm_size; /* size in kbytes */
105
106	unsigned int init_size; /* initial segment, in sectors,
107	* that we know to
108	* have been written
109	*/
110	struct bio bio, currentbio, **biotail;
111	int current_idx;
112	sector_t current_sector;
113
114	struct request_queue *queue;
115
116	struct mm_page {
117	dma_addr_t page_dma;
118	struct mm_dma_desc *desc;
119	int cnt, headcnt;
120	struct bio bio, *biotail;
121	int idx;
122	} mm_pages[2];
123	#define DESC_PER_PAGE ((PAGE_SIZE*2)/sizeof(struct mm_dma_desc))
124
125	int Active, Ready;
126
127	struct tasklet_struct tasklet;
128	unsigned int dma_status;
129
130	struct {
131	int good;
132	int warned;
133	unsigned long last_change;
134	} battery[2];
135
136	spinlock_t lock;
137	int check_batteries;
138
139	int flags;
140	};
141
142	static struct cardinfo cards[MM_MAXCARDS];
143	static struct timer_list battery_timer;
144
145	static int num_cards;
146
147	static struct gendisk *mm_gendisk[MM_MAXCARDS];
148
149	static void check_batteries(struct cardinfo *card);
150
151	static int get_userbit(struct cardinfo *card, int bit)
152	{
153	unsigned char led;
154
155	led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
156	return led & bit;
157	}
158
159	static int set_userbit(struct cardinfo *card, int bit, unsigned char state)
160	{
161	unsigned char led;
162
163	led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
164	if (state)
165	led \|= bit;
166	else
167	led &= ~bit;
168	writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
169
170	return 0;
171	}
172
173	/*
174	* NOTE: For the power LED, use the LED_POWER_* macros since they differ
175	*/
176	static void set_led(struct cardinfo *card, int shift, unsigned char state)
177	{
178	unsigned char led;
179
180	led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
181	if (state == LED_FLIP)
182	led ^= (1<<shift);
183	else {
184	led &= ~(0x03 << shift);
185	led \|= (state << shift);
186	}
187	writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
188
189	}
190
191	#ifdef MM_DIAG
192	static void dump_regs(struct cardinfo *card)
193	{
194	unsigned char *p;
195	int i, i1;
196
197	p = card->csr_remap;
198	for (i = 0; i < 8; i++) {
199	printk(KERN_DEBUG "%p ", p);
200
201	for (i1 = 0; i1 < 16; i1++)
202	printk("%02x ", *p++);
203
204	printk("\n");
205	}
206	}
207	#endif
208
209	static void dump_dmastat(struct cardinfo *card, unsigned int dmastat)
210	{
211	dev_printk(KERN_DEBUG, &card->dev->dev, "DMAstat - ");
212	if (dmastat & DMASCR_ANY_ERR)
213	printk(KERN_CONT "ANY_ERR ");
214	if (dmastat & DMASCR_MBE_ERR)
215	printk(KERN_CONT "MBE_ERR ");
216	if (dmastat & DMASCR_PARITY_ERR_REP)
217	printk(KERN_CONT "PARITY_ERR_REP ");
218	if (dmastat & DMASCR_PARITY_ERR_DET)
219	printk(KERN_CONT "PARITY_ERR_DET ");
220	if (dmastat & DMASCR_SYSTEM_ERR_SIG)
221	printk(KERN_CONT "SYSTEM_ERR_SIG ");
222	if (dmastat & DMASCR_TARGET_ABT)
223	printk(KERN_CONT "TARGET_ABT ");
224	if (dmastat & DMASCR_MASTER_ABT)
225	printk(KERN_CONT "MASTER_ABT ");
226	if (dmastat & DMASCR_CHAIN_COMPLETE)
227	printk(KERN_CONT "CHAIN_COMPLETE ");
228	if (dmastat & DMASCR_DMA_COMPLETE)
229	printk(KERN_CONT "DMA_COMPLETE ");
230	printk("\n");
231	}
232
233	/*
234	* Theory of request handling
235	*
236	* Each bio is assigned to one mm_dma_desc - which may not be enough FIXME
237	* We have two pages of mm_dma_desc, holding about 64 descriptors
238	* each. These are allocated at init time.
239	* One page is "Ready" and is either full, or can have request added.
240	* The other page might be "Active", which DMA is happening on it.
241	*
242	* Whenever IO on the active page completes, the Ready page is activated
243	* and the ex-Active page is clean out and made Ready.
244	* Otherwise the Ready page is only activated when it becomes full.
245	*
246	* If a request arrives while both pages a full, it is queued, and b_rdev is
247	* overloaded to record whether it was a read or a write.
248	*
249	* The interrupt handler only polls the device to clear the interrupt.
250	* The processing of the result is done in a tasklet.
251	*/
252
253	static void mm_start_io(struct cardinfo *card)
254	{
255	/* we have the lock, we know there is
256	* no IO active, and we know that card->Active
257	* is set
258	*/
259	struct mm_dma_desc *desc;
260	struct mm_page *page;
261	int offset;
262
263	/* make the last descriptor end the chain */
264	page = &card->mm_pages[card->Active];
265	pr_debug("start_io: %d %d->%d\n",
266	card->Active, page->headcnt, page->cnt - 1);
267	desc = &page->desc[page->cnt-1];
268
269	desc->control_bits \|= cpu_to_le32(DMASCR_CHAIN_COMP_EN);
270	desc->control_bits &= ~cpu_to_le32(DMASCR_CHAIN_EN);
271	desc->sem_control_bits = desc->control_bits;
272
273
274	if (debug & DEBUG_LED_ON_TRANSFER)
275	set_led(card, LED_REMOVE, LED_ON);
276
277	desc = &page->desc[page->headcnt];
278	writel(0, card->csr_remap + DMA_PCI_ADDR);
279	writel(0, card->csr_remap + DMA_PCI_ADDR + 4);
280
281	writel(0, card->csr_remap + DMA_LOCAL_ADDR);
282	writel(0, card->csr_remap + DMA_LOCAL_ADDR + 4);
283
284	writel(0, card->csr_remap + DMA_TRANSFER_SIZE);
285	writel(0, card->csr_remap + DMA_TRANSFER_SIZE + 4);
286
287	writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR);
288	writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR + 4);
289
290	offset = ((char )desc) - ((char )page->desc);
291	writel(cpu_to_le32((page->page_dma+offset) & 0xffffffff),
292	card->csr_remap + DMA_DESCRIPTOR_ADDR);
293	/* Force the value to u64 before shifting otherwise >> 32 is undefined C
294	* and on some ports will do nothing ! */
295	writel(cpu_to_le32(((u64)page->page_dma)>>32),
296	card->csr_remap + DMA_DESCRIPTOR_ADDR + 4);
297
298	/* Go, go, go */
299	writel(cpu_to_le32(DMASCR_GO \| DMASCR_CHAIN_EN \| pci_cmds),
300	card->csr_remap + DMA_STATUS_CTRL);
301	}
302
303	static int add_bio(struct cardinfo *card);
304
305	static void activate(struct cardinfo *card)
306	{
307	/* if No page is Active, and Ready is
308	* not empty, then switch Ready page
309	* to active and start IO.
310	* Then add any bh's that are available to Ready
311	*/
312
313	do {
314	while (add_bio(card))
315	;
316
317	if (card->Active == -1 &&
318	card->mm_pages[card->Ready].cnt > 0) {
319	card->Active = card->Ready;
320	card->Ready = 1-card->Ready;
321	mm_start_io(card);
322	}
323
324	} while (card->Active == -1 && add_bio(card));
325	}
326
327	static inline void reset_page(struct mm_page *page)
328	{
329	page->cnt = 0;
330	page->headcnt = 0;
331	page->bio = NULL;
332	page->biotail = &page->bio;
333	}
334
335	/*
336	* If there is room on Ready page, take
337	* one bh off list and add it.
338	* return 1 if there was room, else 0.
339	*/
340	static int add_bio(struct cardinfo *card)
341	{
342	struct mm_page *p;
343	struct mm_dma_desc *desc;
344	dma_addr_t dma_handle;
345	int offset;
346	struct bio *bio;
347	struct bio_vec *vec;
348	int idx;
349	int rw;
350	int len;
351
352	bio = card->currentbio;
353	if (!bio && card->bio) {
354	card->currentbio = card->bio;
355	card->current_idx = card->bio->bi_idx;
356	card->current_sector = card->bio->bi_sector;
357	card->bio = card->bio->bi_next;
358	if (card->bio == NULL)
359	card->biotail = &card->bio;
360	card->currentbio->bi_next = NULL;
361	return 1;
362	}
363	if (!bio)
364	return 0;
365	idx = card->current_idx;
366
367	rw = bio_rw(bio);
368	if (card->mm_pages[card->Ready].cnt >= DESC_PER_PAGE)
369	return 0;
370
371	vec = bio_iovec_idx(bio, idx);
372	len = vec->bv_len;
373	dma_handle = pci_map_page(card->dev,
374	vec->bv_page,
375	vec->bv_offset,
376	len,
377	(rw == READ) ?
378	PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
379
380	p = &card->mm_pages[card->Ready];
381	desc = &p->desc[p->cnt];
382	p->cnt++;
383	if (p->bio == NULL)
384	p->idx = idx;
385	if ((p->biotail) != &bio->bi_next) {
386	*(p->biotail) = bio;
387	p->biotail = &(bio->bi_next);
388	bio->bi_next = NULL;
389	}
390
391	desc->data_dma_handle = dma_handle;
392
393	desc->pci_addr = cpu_to_le64((u64)desc->data_dma_handle);
394	desc->local_addr = cpu_to_le64(card->current_sector << 9);
395	desc->transfer_size = cpu_to_le32(len);
396	offset = (((char )&desc->sem_control_bits) - ((char )p->desc));
397	desc->sem_addr = cpu_to_le64((u64)(p->page_dma+offset));
398	desc->zero1 = desc->zero2 = 0;
399	offset = (((char )(desc+1)) - ((char )p->desc));
400	desc->next_desc_addr = cpu_to_le64(p->page_dma+offset);
401	desc->control_bits = cpu_to_le32(DMASCR_GO\|DMASCR_ERR_INT_EN\|
402	DMASCR_PARITY_INT_EN\|
403	DMASCR_CHAIN_EN \|
404	DMASCR_SEM_EN \|
405	pci_cmds);
406	if (rw == WRITE)
407	desc->control_bits \|= cpu_to_le32(DMASCR_TRANSFER_READ);
408	desc->sem_control_bits = desc->control_bits;
409
410	card->current_sector += (len >> 9);
411	idx++;
412	card->current_idx = idx;
413	if (idx >= bio->bi_vcnt)
414	card->currentbio = NULL;
415
416	return 1;
417	}
418
419	static void process_page(unsigned long data)
420	{
421	/* check if any of the requests in the page are DMA_COMPLETE,
422	* and deal with them appropriately.
423	* If we find a descriptor without DMA_COMPLETE in the semaphore, then
424	* dma must have hit an error on that descriptor, so use dma_status
425	* instead and assume that all following descriptors must be re-tried.
426	*/
427	struct mm_page *page;
428	struct bio *return_bio = NULL;
429	struct cardinfo card = (struct cardinfo )data;
430	unsigned int dma_status = card->dma_status;
431
432	spin_lock_bh(&card->lock);
433	if (card->Active < 0)
434	goto out_unlock;
435	page = &card->mm_pages[card->Active];
436
437	while (page->headcnt < page->cnt) {
438	struct bio *bio = page->bio;
439	struct mm_dma_desc *desc = &page->desc[page->headcnt];
440	int control = le32_to_cpu(desc->sem_control_bits);
441	int last = 0;
442	int idx;
443
444	if (!(control & DMASCR_DMA_COMPLETE)) {
445	control = dma_status;
446	last = 1;
447	}
448	page->headcnt++;
449	idx = page->idx;
450	page->idx++;
451	if (page->idx >= bio->bi_vcnt) {
452	page->bio = bio->bi_next;
453	if (page->bio)
454	page->idx = page->bio->bi_idx;
455	}
456
457	pci_unmap_page(card->dev, desc->data_dma_handle,
458	bio_iovec_idx(bio, idx)->bv_len,
459	(control & DMASCR_TRANSFER_READ) ?
460	PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
461	if (control & DMASCR_HARD_ERROR) {
462	/* error */
463	clear_bit(BIO_UPTODATE, &bio->bi_flags);
464	dev_printk(KERN_WARNING, &card->dev->dev,
465	"I/O error on sector %d/%d\n",
466	le32_to_cpu(desc->local_addr)>>9,
467	le32_to_cpu(desc->transfer_size));
468	dump_dmastat(card, control);
469	} else if ((bio->bi_rw & REQ_WRITE) &&
470	le32_to_cpu(desc->local_addr) >> 9 ==
471	card->init_size) {
472	card->init_size += le32_to_cpu(desc->transfer_size) >> 9;
473	if (card->init_size >> 1 >= card->mm_size) {
474	dev_printk(KERN_INFO, &card->dev->dev,
475	"memory now initialised\n");
476	set_userbit(card, MEMORY_INITIALIZED, 1);
477	}
478	}
479	if (bio != page->bio) {
480	bio->bi_next = return_bio;
481	return_bio = bio;
482	}
483
484	if (last)
485	break;
486	}
487
488	if (debug & DEBUG_LED_ON_TRANSFER)
489	set_led(card, LED_REMOVE, LED_OFF);
490
491	if (card->check_batteries) {
492	card->check_batteries = 0;
493	check_batteries(card);
494	}
495	if (page->headcnt >= page->cnt) {
496	reset_page(page);
497	card->Active = -1;
498	activate(card);
499	} else {
500	/* haven't finished with this one yet */
501	pr_debug("do some more\n");
502	mm_start_io(card);
503	}
504	out_unlock:
505	spin_unlock_bh(&card->lock);
506
507	while (return_bio) {
508	struct bio *bio = return_bio;
509
510	return_bio = bio->bi_next;
511	bio->bi_next = NULL;
512	bio_endio(bio, 0);
513	}
514	}
515
516	static void mm_unplug(struct blk_plug_cb *cb, bool from_schedule)
517	{
518	struct cardinfo *card = cb->data;
519
520	spin_lock_irq(&card->lock);
521	activate(card);
522	spin_unlock_irq(&card->lock);
523	kfree(cb);
524	}
525
526	static int mm_check_plugged(struct cardinfo *card)
527	{
528	return !!blk_check_plugged(mm_unplug, card, sizeof(struct blk_plug_cb));
529	}
530
531	static void mm_make_request(struct request_queue q, struct bio bio)
532	{
533	struct cardinfo *card = q->queuedata;
534	pr_debug("mm_make_request %llu %u\n",
535	(unsigned long long)bio->bi_sector, bio->bi_size);
536
537	spin_lock_irq(&card->lock);
538	*card->biotail = bio;
539	bio->bi_next = NULL;
540	card->biotail = &bio->bi_next;
541	if (bio->bi_rw & REQ_SYNC \|\| !mm_check_plugged(card))
542	activate(card);
543	spin_unlock_irq(&card->lock);
544
545	return;
546	}
547
548	static irqreturn_t mm_interrupt(int irq, void *__card)
549	{
550	struct cardinfo card = (struct cardinfo ) __card;
551	unsigned int dma_status;
552	unsigned short cfg_status;
553
554	HW_TRACE(0x30);
555
556	dma_status = le32_to_cpu(readl(card->csr_remap + DMA_STATUS_CTRL));
557
558	if (!(dma_status & (DMASCR_ERROR_MASK \| DMASCR_CHAIN_COMPLETE))) {
559	/* interrupt wasn't for me ... */
560	return IRQ_NONE;
561	}
562
563	/* clear COMPLETION interrupts */
564	if (card->flags & UM_FLAG_NO_BYTE_STATUS)
565	writel(cpu_to_le32(DMASCR_DMA_COMPLETE\|DMASCR_CHAIN_COMPLETE),
566	card->csr_remap + DMA_STATUS_CTRL);
567	else
568	writeb((DMASCR_DMA_COMPLETE\|DMASCR_CHAIN_COMPLETE) >> 16,
569	card->csr_remap + DMA_STATUS_CTRL + 2);
570
571	/* log errors and clear interrupt status */
572	if (dma_status & DMASCR_ANY_ERR) {
573	unsigned int data_log1, data_log2;
574	unsigned int addr_log1, addr_log2;
575	unsigned char stat, count, syndrome, check;
576
577	stat = readb(card->csr_remap + MEMCTRLCMD_ERRSTATUS);
578
579	data_log1 = le32_to_cpu(readl(card->csr_remap +
580	ERROR_DATA_LOG));
581	data_log2 = le32_to_cpu(readl(card->csr_remap +
582	ERROR_DATA_LOG + 4));
583	addr_log1 = le32_to_cpu(readl(card->csr_remap +
584	ERROR_ADDR_LOG));
585	addr_log2 = readb(card->csr_remap + ERROR_ADDR_LOG + 4);
586
587	count = readb(card->csr_remap + ERROR_COUNT);
588	syndrome = readb(card->csr_remap + ERROR_SYNDROME);
589	check = readb(card->csr_remap + ERROR_CHECK);
590
591	dump_dmastat(card, dma_status);
592
593	if (stat & 0x01)
594	dev_printk(KERN_ERR, &card->dev->dev,
595	"Memory access error detected (err count %d)\n",
596	count);
597	if (stat & 0x02)
598	dev_printk(KERN_ERR, &card->dev->dev,
599	"Multi-bit EDC error\n");
600
601	dev_printk(KERN_ERR, &card->dev->dev,
602	"Fault Address 0x%02x%08x, Fault Data 0x%08x%08x\n",
603	addr_log2, addr_log1, data_log2, data_log1);
604	dev_printk(KERN_ERR, &card->dev->dev,
605	"Fault Check 0x%02x, Fault Syndrome 0x%02x\n",
606	check, syndrome);
607
608	writeb(0, card->csr_remap + ERROR_COUNT);
609	}
610
611	if (dma_status & DMASCR_PARITY_ERR_REP) {
612	dev_printk(KERN_ERR, &card->dev->dev,
613	"PARITY ERROR REPORTED\n");
614	pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
615	pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
616	}
617
618	if (dma_status & DMASCR_PARITY_ERR_DET) {
619	dev_printk(KERN_ERR, &card->dev->dev,
620	"PARITY ERROR DETECTED\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_SYSTEM_ERR_SIG) {
626	dev_printk(KERN_ERR, &card->dev->dev, "SYSTEM ERROR\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_TARGET_ABT) {
632	dev_printk(KERN_ERR, &card->dev->dev, "TARGET 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	if (dma_status & DMASCR_MASTER_ABT) {
638	dev_printk(KERN_ERR, &card->dev->dev, "MASTER ABORT\n");
639	pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
640	pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
641	}
642
643	/* and process the DMA descriptors */
644	card->dma_status = dma_status;
645	tasklet_schedule(&card->tasklet);
646
647	HW_TRACE(0x36);
648
649	return IRQ_HANDLED;
650	}
651
652	/*
653	* If both batteries are good, no LED
654	* If either battery has been warned, solid LED
655	* If both batteries are bad, flash the LED quickly
656	* If either battery is bad, flash the LED semi quickly
657	*/
658	static void set_fault_to_battery_status(struct cardinfo *card)
659	{
660	if (card->battery[0].good && card->battery[1].good)
661	set_led(card, LED_FAULT, LED_OFF);
662	else if (card->battery[0].warned \|\| card->battery[1].warned)
663	set_led(card, LED_FAULT, LED_ON);
664	else if (!card->battery[0].good && !card->battery[1].good)
665	set_led(card, LED_FAULT, LED_FLASH_7_0);
666	else
667	set_led(card, LED_FAULT, LED_FLASH_3_5);
668	}
669
670	static void init_battery_timer(void);
671
672	static int check_battery(struct cardinfo *card, int battery, int status)
673	{
674	if (status != card->battery[battery].good) {
675	card->battery[battery].good = !card->battery[battery].good;
676	card->battery[battery].last_change = jiffies;
677
678	if (card->battery[battery].good) {
679	dev_printk(KERN_ERR, &card->dev->dev,
680	"Battery %d now good\n", battery + 1);
681	card->battery[battery].warned = 0;
682	} else
683	dev_printk(KERN_ERR, &card->dev->dev,
684	"Battery %d now FAILED\n", battery + 1);
685
686	return 1;
687	} else if (!card->battery[battery].good &&
688	!card->battery[battery].warned &&
689	time_after_eq(jiffies, card->battery[battery].last_change +
690	(HZ * 60 * 60 * 5))) {
691	dev_printk(KERN_ERR, &card->dev->dev,
692	"Battery %d still FAILED after 5 hours\n", battery + 1);
693	card->battery[battery].warned = 1;
694
695	return 1;
696	}
697
698	return 0;
699	}
700
701	static void check_batteries(struct cardinfo *card)
702	{
703	/* NOTE: this must never be called while the card
704	* is doing (bus-to-card) DMA, or you will need the
705	* reset switch
706	*/
707	unsigned char status;
708	int ret1, ret2;
709
710	status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
711	if (debug & DEBUG_BATTERY_POLLING)
712	dev_printk(KERN_DEBUG, &card->dev->dev,
713	"checking battery status, 1 = %s, 2 = %s\n",
714	(status & BATTERY_1_FAILURE) ? "FAILURE" : "OK",
715	(status & BATTERY_2_FAILURE) ? "FAILURE" : "OK");
716
717	ret1 = check_battery(card, 0, !(status & BATTERY_1_FAILURE));
718	ret2 = check_battery(card, 1, !(status & BATTERY_2_FAILURE));
719
720	if (ret1 \|\| ret2)
721	set_fault_to_battery_status(card);
722	}
723
724	static void check_all_batteries(unsigned long ptr)
725	{
726	int i;
727
728	for (i = 0; i < num_cards; i++)
729	if (!(cards[i].flags & UM_FLAG_NO_BATT)) {
730	struct cardinfo *card = &cards[i];
731	spin_lock_bh(&card->lock);
732	if (card->Active >= 0)
733	card->check_batteries = 1;
734	else
735	check_batteries(card);
736	spin_unlock_bh(&card->lock);
737	}
738
739	init_battery_timer();
740	}
741
742	static void init_battery_timer(void)
743	{
744	init_timer(&battery_timer);
745	battery_timer.function = check_all_batteries;
746	battery_timer.expires = jiffies + (HZ * 60);
747	add_timer(&battery_timer);
748	}
749
750	static void del_battery_timer(void)
751	{
752	del_timer(&battery_timer);
753	}
754
755	/*
756	* Note no locks taken out here. In a worst case scenario, we could drop
757	* a chunk of system memory. But that should never happen, since validation
758	* happens at open or mount time, when locks are held.
759	*
760	* That's crap, since doing that while some partitions are opened
761	* or mounted will give you really nasty results.
762	*/
763	static int mm_revalidate(struct gendisk *disk)
764	{
765	struct cardinfo *card = disk->private_data;
766	set_capacity(disk, card->mm_size << 1);
767	return 0;
768	}
769
770	static int mm_getgeo(struct block_device bdev, struct hd_geometry geo)
771	{
772	struct cardinfo *card = bdev->bd_disk->private_data;
773	int size = card->mm_size * (1024 / MM_HARDSECT);
774
775	/*
776	* get geometry: we have to fake one... trim the size to a
777	* multiple of 2048 (1M): tell we have 32 sectors, 64 heads,
778	* whatever cylinders.
779	*/
780	geo->heads = 64;
781	geo->sectors = 32;
782	geo->cylinders = size / (geo->heads * geo->sectors);
783	return 0;
784	}
785
786	static const struct block_device_operations mm_fops = {
787	.owner = THIS_MODULE,
788	.getgeo = mm_getgeo,
789	.revalidate_disk = mm_revalidate,
790	};
791
792	static int __devinit mm_pci_probe(struct pci_dev *dev,
793	const struct pci_device_id *id)
794	{
795	int ret = -ENODEV;
796	struct cardinfo *card = &cards[num_cards];
797	unsigned char mem_present;
798	unsigned char batt_status;
799	unsigned int saved_bar, data;
800	unsigned long csr_base;
801	unsigned long csr_len;
802	int magic_number;
803	static int printed_version;
804
805	if (!printed_version++)
806	printk(KERN_INFO DRIVER_VERSION " : " DRIVER_DESC "\n");
807
808	ret = pci_enable_device(dev);
809	if (ret)
810	return ret;
811
812	pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xF8);
813	pci_set_master(dev);
814
815	card->dev = dev;
816
817	csr_base = pci_resource_start(dev, 0);
818	csr_len = pci_resource_len(dev, 0);
819	if (!csr_base \|\| !csr_len)
820	return -ENODEV;
821
822	dev_printk(KERN_INFO, &dev->dev,
823	"Micro Memory(tm) controller found (PCI Mem Module (Battery Backup))\n");
824
825	if (pci_set_dma_mask(dev, DMA_BIT_MASK(64)) &&
826	pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
827	dev_printk(KERN_WARNING, &dev->dev, "NO suitable DMA found\n");
828	return -ENOMEM;
829	}
830
831	ret = pci_request_regions(dev, DRIVER_NAME);
832	if (ret) {
833	dev_printk(KERN_ERR, &card->dev->dev,
834	"Unable to request memory region\n");
835	goto failed_req_csr;
836	}
837
838	card->csr_remap = ioremap_nocache(csr_base, csr_len);
839	if (!card->csr_remap) {
840	dev_printk(KERN_ERR, &card->dev->dev,
841	"Unable to remap memory region\n");
842	ret = -ENOMEM;
843
844	goto failed_remap_csr;
845	}
846
847	dev_printk(KERN_INFO, &card->dev->dev,
848	"CSR 0x%08lx -> 0x%p (0x%lx)\n",
849	csr_base, card->csr_remap, csr_len);
850
851	switch (card->dev->device) {
852	case 0x5415:
853	card->flags \|= UM_FLAG_NO_BYTE_STATUS \| UM_FLAG_NO_BATTREG;
854	magic_number = 0x59;
855	break;
856
857	case 0x5425:
858	card->flags \|= UM_FLAG_NO_BYTE_STATUS;
859	magic_number = 0x5C;
860	break;
861
862	case 0x6155:
863	card->flags \|= UM_FLAG_NO_BYTE_STATUS \|
864	UM_FLAG_NO_BATTREG \| UM_FLAG_NO_BATT;
865	magic_number = 0x99;
866	break;
867
868	default:
869	magic_number = 0x100;
870	break;
871	}
872
873	if (readb(card->csr_remap + MEMCTRLSTATUS_MAGIC) != magic_number) {
874	dev_printk(KERN_ERR, &card->dev->dev, "Magic number invalid\n");
875	ret = -ENOMEM;
876	goto failed_magic;
877	}
878
879	card->mm_pages[0].desc = pci_alloc_consistent(card->dev,
880	PAGE_SIZE * 2,
881	&card->mm_pages[0].page_dma);
882	card->mm_pages[1].desc = pci_alloc_consistent(card->dev,
883	PAGE_SIZE * 2,
884	&card->mm_pages[1].page_dma);
885	if (card->mm_pages[0].desc == NULL \|\|
886	card->mm_pages[1].desc == NULL) {
887	dev_printk(KERN_ERR, &card->dev->dev, "alloc failed\n");
888	goto failed_alloc;
889	}
890	reset_page(&card->mm_pages[0]);
891	reset_page(&card->mm_pages[1]);
892	card->Ready = 0; /* page 0 is ready */
893	card->Active = -1; /* no page is active */
894	card->bio = NULL;
895	card->biotail = &card->bio;
896
897	card->queue = blk_alloc_queue(GFP_KERNEL);
898	if (!card->queue)
899	goto failed_alloc;
900
901	blk_queue_make_request(card->queue, mm_make_request);
902	card->queue->queue_lock = &card->lock;
903	card->queue->queuedata = card;
904
905	tasklet_init(&card->tasklet, process_page, (unsigned long)card);
906
907	card->check_batteries = 0;
908
909	mem_present = readb(card->csr_remap + MEMCTRLSTATUS_MEMORY);
910	switch (mem_present) {
911	case MEM_128_MB:
912	card->mm_size = 1024 * 128;
913	break;
914	case MEM_256_MB:
915	card->mm_size = 1024 * 256;
916	break;
917	case MEM_512_MB:
918	card->mm_size = 1024 * 512;
919	break;
920	case MEM_1_GB:
921	card->mm_size = 1024 * 1024;
922	break;
923	case MEM_2_GB:
924	card->mm_size = 1024 * 2048;
925	break;
926	default:
927	card->mm_size = 0;
928	break;
929	}
930
931	/* Clear the LED's we control */
932	set_led(card, LED_REMOVE, LED_OFF);
933	set_led(card, LED_FAULT, LED_OFF);
934
935	batt_status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
936
937	card->battery[0].good = !(batt_status & BATTERY_1_FAILURE);
938	card->battery[1].good = !(batt_status & BATTERY_2_FAILURE);
939	card->battery[0].last_change = card->battery[1].last_change = jiffies;
940
941	if (card->flags & UM_FLAG_NO_BATT)
942	dev_printk(KERN_INFO, &card->dev->dev,
943	"Size %d KB\n", card->mm_size);
944	else {
945	dev_printk(KERN_INFO, &card->dev->dev,
946	"Size %d KB, Battery 1 %s (%s), Battery 2 %s (%s)\n",
947	card->mm_size,
948	batt_status & BATTERY_1_DISABLED ? "Disabled" : "Enabled",
949	card->battery[0].good ? "OK" : "FAILURE",
950	batt_status & BATTERY_2_DISABLED ? "Disabled" : "Enabled",
951	card->battery[1].good ? "OK" : "FAILURE");
952
953	set_fault_to_battery_status(card);
954	}
955
956	pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &saved_bar);
957	data = 0xffffffff;
958	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, data);
959	pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &data);
960	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, saved_bar);
961	data &= 0xfffffff0;
962	data = ~data;
963	data += 1;
964
965	if (request_irq(dev->irq, mm_interrupt, IRQF_SHARED, DRIVER_NAME,
966	card)) {
967	dev_printk(KERN_ERR, &card->dev->dev,
968	"Unable to allocate IRQ\n");
969	ret = -ENODEV;
970	goto failed_req_irq;
971	}
972
973	dev_printk(KERN_INFO, &card->dev->dev,
974	"Window size %d bytes, IRQ %d\n", data, dev->irq);
975
976	spin_lock_init(&card->lock);
977
978	pci_set_drvdata(dev, card);
979
980	if (pci_write_cmd != 0x0F) /* If not Memory Write & Invalidate */
981	pci_write_cmd = 0x07; /* then Memory Write command */
982
983	if (pci_write_cmd & 0x08) { /* use Memory Write and Invalidate */
984	unsigned short cfg_command;
985	pci_read_config_word(dev, PCI_COMMAND, &cfg_command);
986	cfg_command \|= 0x10; /* Memory Write & Invalidate Enable */
987	pci_write_config_word(dev, PCI_COMMAND, cfg_command);
988	}
989	pci_cmds = (pci_read_cmd << 28) \| (pci_write_cmd << 24);
990
991	num_cards++;
992
993	if (!get_userbit(card, MEMORY_INITIALIZED)) {
994	dev_printk(KERN_INFO, &card->dev->dev,
995	"memory NOT initialized. Consider over-writing whole device.\n");
996	card->init_size = 0;
997	} else {
998	dev_printk(KERN_INFO, &card->dev->dev,
999	"memory already initialized\n");
1000	card->init_size = card->mm_size;
1001	}
1002
1003	/* Enable ECC */
1004	writeb(EDC_STORE_CORRECT, card->csr_remap + MEMCTRLCMD_ERRCTRL);
1005
1006	return 0;
1007
1008	failed_req_irq:
1009	failed_alloc:
1010	if (card->mm_pages[0].desc)
1011	pci_free_consistent(card->dev, PAGE_SIZE*2,
1012	card->mm_pages[0].desc,
1013	card->mm_pages[0].page_dma);
1014	if (card->mm_pages[1].desc)
1015	pci_free_consistent(card->dev, PAGE_SIZE*2,
1016	card->mm_pages[1].desc,
1017	card->mm_pages[1].page_dma);
1018	failed_magic:
1019	iounmap(card->csr_remap);
1020	failed_remap_csr:
1021	pci_release_regions(dev);
1022	failed_req_csr:
1023
1024	return ret;
1025	}
1026
1027	static void mm_pci_remove(struct pci_dev *dev)
1028	{
1029	struct cardinfo *card = pci_get_drvdata(dev);
1030
1031	tasklet_kill(&card->tasklet);
1032	free_irq(dev->irq, card);
1033	iounmap(card->csr_remap);
1034
1035	if (card->mm_pages[0].desc)
1036	pci_free_consistent(card->dev, PAGE_SIZE*2,
1037	card->mm_pages[0].desc,
1038	card->mm_pages[0].page_dma);
1039	if (card->mm_pages[1].desc)
1040	pci_free_consistent(card->dev, PAGE_SIZE*2,
1041	card->mm_pages[1].desc,
1042	card->mm_pages[1].page_dma);
1043	blk_cleanup_queue(card->queue);
1044
1045	pci_release_regions(dev);
1046	pci_disable_device(dev);
1047	}
1048
1049	static const struct pci_device_id mm_pci_ids[] = {
1050	{PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_5415CN)},
1051	{PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_5425CN)},
1052	{PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY, PCI_DEVICE_ID_MICRO_MEMORY_6155)},
1053	{
1054	.vendor = 0x8086,
1055	.device = 0xB555,
1056	.subvendor = 0x1332,
1057	.subdevice = 0x5460,
1058	.class = 0x050000,
1059	.class_mask = 0,
1060	}, { /* end: all zeroes */ }
1061	};
1062
1063	MODULE_DEVICE_TABLE(pci, mm_pci_ids);
1064
1065	static struct pci_driver mm_pci_driver = {
1066	.name = DRIVER_NAME,
1067	.id_table = mm_pci_ids,
1068	.probe = mm_pci_probe,
1069	.remove = mm_pci_remove,
1070	};
1071
1072	static int __init mm_init(void)
1073	{
1074	int retval, i;
1075	int err;
1076
1077	retval = pci_register_driver(&mm_pci_driver);
1078	if (retval)
1079	return -ENOMEM;
1080
1081	err = major_nr = register_blkdev(0, DRIVER_NAME);
1082	if (err < 0) {
1083	pci_unregister_driver(&mm_pci_driver);
1084	return -EIO;
1085	}
1086
1087	for (i = 0; i < num_cards; i++) {
1088	mm_gendisk[i] = alloc_disk(1 << MM_SHIFT);
1089	if (!mm_gendisk[i])
1090	goto out;
1091	}
1092
1093	for (i = 0; i < num_cards; i++) {
1094	struct gendisk *disk = mm_gendisk[i];
1095	sprintf(disk->disk_name, "umem%c", 'a'+i);
1096	spin_lock_init(&cards[i].lock);
1097	disk->major = major_nr;
1098	disk->first_minor = i << MM_SHIFT;
1099	disk->fops = &mm_fops;
1100	disk->private_data = &cards[i];
1101	disk->queue = cards[i].queue;
1102	set_capacity(disk, cards[i].mm_size << 1);
1103	add_disk(disk);
1104	}
1105
1106	init_battery_timer();
1107	printk(KERN_INFO "MM: desc_per_page = %ld\n", DESC_PER_PAGE);
1108	/* printk("mm_init: Done. 10-19-01 9:00\n"); */
1109	return 0;
1110
1111	out:
1112	pci_unregister_driver(&mm_pci_driver);
1113	unregister_blkdev(major_nr, DRIVER_NAME);
1114	while (i--)
1115	put_disk(mm_gendisk[i]);
1116	return -ENOMEM;
1117	}
1118
1119	static void __exit mm_cleanup(void)
1120	{
1121	int i;
1122
1123	del_battery_timer();
1124
1125	for (i = 0; i < num_cards ; i++) {
1126	del_gendisk(mm_gendisk[i]);
1127	put_disk(mm_gendisk[i]);
1128	}
1129
1130	pci_unregister_driver(&mm_pci_driver);
1131
1132	unregister_blkdev(major_nr, DRIVER_NAME);
1133	}
1134
1135	module_init(mm_init);
1136	module_exit(mm_cleanup);
1137
1138	MODULE_AUTHOR(DRIVER_AUTHOR);
1139	MODULE_DESCRIPTION(DRIVER_DESC);
1140	MODULE_LICENSE("GPL");
1141

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