summaryrefslogtreecommitdiffstats
path: root/drivers/block/cciss.h
blob: c2ef9dd56c45998386f53c659db9584f4837d398 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
#ifndef CCISS_H
#define CCISS_H

#include <linux/genhd.h>
#include <linux/mutex.h>

#include "cciss_cmd.h"


#define NWD_SHIFT	4
#define MAX_PART	(1 << NWD_SHIFT)

#define IO_OK		0
#define IO_ERROR	1
#define IO_NEEDS_RETRY  3

#define VENDOR_LEN	8
#define MODEL_LEN	16
#define REV_LEN		4

struct ctlr_info;
typedef struct ctlr_info ctlr_info_t;

struct access_method {
	void (*submit_command)(ctlr_info_t *h, CommandList_struct *c);
	void (*set_intr_mask)(ctlr_info_t *h, unsigned long val);
	unsigned long (*fifo_full)(ctlr_info_t *h);
	bool (*intr_pending)(ctlr_info_t *h);
	unsigned long (*command_completed)(ctlr_info_t *h);
};
typedef struct _drive_info_struct
{
	unsigned char LunID[8];
	int 	usage_count;
	struct request_queue *queue;
	sector_t nr_blocks;
	int	block_size;
	int 	heads;
	int	sectors;
	int 	cylinders;
	int	raid_level; /* set to -1 to indicate that
			     * the drive is not in use/configured
			     */
	int	busy_configuring; /* This is set when a drive is being removed
				   * to prevent it from being opened or it's
				   * queue from being started.
				   */
	struct	device dev;
	__u8 serial_no[16]; /* from inquiry page 0x83,
			     * not necc. null terminated.
			     */
	char vendor[VENDOR_LEN + 1]; /* SCSI vendor string */
	char model[MODEL_LEN + 1];   /* SCSI model string */
	char rev[REV_LEN + 1];       /* SCSI revision string */
	char device_initialized;     /* indicates whether dev is initialized */
} drive_info_struct;

struct ctlr_info
{
	int	ctlr;
	char	devname[8];
	char    *product_name;
	char	firm_ver[4]; /* Firmware version */
	struct pci_dev *pdev;
	__u32	board_id;
	void __iomem *vaddr;
	unsigned long paddr;
	int 	nr_cmds; /* Number of commands allowed on this controller */
	CfgTable_struct __iomem *cfgtable;
	int	interrupts_enabled;
	int	major;
	int 	max_commands;
	int	commands_outstanding;
	int 	max_outstanding; /* Debug */ 
	int	num_luns;
	int 	highest_lun;
	int	usage_count;  /* number of opens all all minor devices */
	/* Need space for temp sg list
	 * number of scatter/gathers supported
	 * number of scatter/gathers in chained block
	 */
	struct	scatterlist **scatter_list;
	int	maxsgentries;
	int	chainsize;
	int	max_cmd_sgentries;
	SGDescriptor_struct **cmd_sg_list;

#	define PERF_MODE_INT	0
#	define DOORBELL_INT	1
#	define SIMPLE_MODE_INT	2
#	define MEMQ_MODE_INT	3
	unsigned int intr[4];
	unsigned int msix_vector;
	unsigned int msi_vector;
	int 	cciss_max_sectors;
	BYTE	cciss_read;
	BYTE	cciss_write;
	BYTE	cciss_read_capacity;

	/* information about each logical volume */
	drive_info_struct *drv[CISS_MAX_LUN];

	struct access_method access;

	/* queue and queue Info */ 
	struct hlist_head reqQ;
	struct hlist_head cmpQ;
	unsigned int Qdepth;
	unsigned int maxQsinceinit;
	unsigned int maxSG;
	spinlock_t lock;

	/* pointers to command and error info pool */
	CommandList_struct 	*cmd_pool;
	dma_addr_t		cmd_pool_dhandle; 
	ErrorInfo_struct 	*errinfo_pool;
	dma_addr_t		errinfo_pool_dhandle; 
        unsigned long  		*cmd_pool_bits;
	int			nr_allocs;
	int			nr_frees; 
	int			busy_configuring;
	int			busy_initializing;
	int			busy_scanning;
	struct mutex		busy_shutting_down;

	/* This element holds the zero based queue number of the last
	 * queue to be started.  It is used for fairness.
	*/
	int			next_to_run;

	/* Disk structures we need to pass back */
	struct gendisk   *gendisk[CISS_MAX_LUN];
#ifdef CONFIG_CISS_SCSI_TAPE
	struct cciss_scsi_adapter_data_t *scsi_ctlr;
#endif
	unsigned char alive;
	struct list_head scan_list;
	struct completion scan_wait;
	struct device dev;
	/*
	 * Performant mode tables.
	 */
	u32 trans_support;
	u32 trans_offset;
	struct TransTable_struct *transtable;
	unsigned long transMethod;

	/*
	 * Performant mode completion buffer
	 */
	u64 *reply_pool;
	dma_addr_t reply_pool_dhandle;
	u64 *reply_pool_head;
	size_t reply_pool_size;
	unsigned char reply_pool_wraparound;
	u32 *blockFetchTable;
};

/*  Defining the diffent access_methods
 *
 * Memory mapped FIFO interface (SMART 53xx cards)
 */
#define SA5_DOORBELL	0x20
#define SA5_REQUEST_PORT_OFFSET	0x40
#define SA5_REPLY_INTR_MASK_OFFSET	0x34
#define SA5_REPLY_PORT_OFFSET		0x44
#define SA5_INTR_STATUS		0x30
#define SA5_SCRATCHPAD_OFFSET	0xB0

#define SA5_CTCFG_OFFSET	0xB4
#define SA5_CTMEM_OFFSET	0xB8

#define SA5_INTR_OFF		0x08
#define SA5B_INTR_OFF		0x04
#define SA5_INTR_PENDING	0x08
#define SA5B_INTR_PENDING	0x04
#define FIFO_EMPTY		0xffffffff	
#define CCISS_FIRMWARE_READY	0xffff0000 /* value in scratchpad register */
/* Perf. mode flags */
#define SA5_PERF_INTR_PENDING	0x04
#define SA5_PERF_INTR_OFF	0x05
#define SA5_OUTDB_STATUS_PERF_BIT	0x01
#define SA5_OUTDB_CLEAR_PERF_BIT	0x01
#define SA5_OUTDB_CLEAR         0xA0
#define SA5_OUTDB_CLEAR_PERF_BIT        0x01
#define SA5_OUTDB_STATUS        0x9C


#define  CISS_ERROR_BIT		0x02

#define CCISS_INTR_ON 	1 
#define CCISS_INTR_OFF	0


/* CCISS_BOARD_READY_WAIT_SECS is how long to wait for a board
 * to become ready, in seconds, before giving up on it.
 * CCISS_BOARD_READY_POLL_INTERVAL_MSECS * is how long to wait
 * between polling the board to see if it is ready, in
 * milliseconds.  CCISS_BOARD_READY_ITERATIONS is derived
 * the above.
 */
#define CCISS_BOARD_READY_WAIT_SECS (120)
#define CCISS_BOARD_READY_POLL_INTERVAL_MSECS (100)
#define CCISS_BOARD_READY_ITERATIONS \
	((CCISS_BOARD_READY_WAIT_SECS * 1000) / \
		CCISS_BOARD_READY_POLL_INTERVAL_MSECS)

/* 
	Send the command to the hardware 
*/
static void SA5_submit_command( ctlr_info_t *h, CommandList_struct *c) 
{
#ifdef CCISS_DEBUG
	printk(KERN_WARNING "cciss%d: Sending %08x - down to controller\n",
			h->ctlr, c->busaddr);
#endif /* CCISS_DEBUG */
         writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
	 h->commands_outstanding++;
	 if ( h->commands_outstanding > h->max_outstanding)
		h->max_outstanding = h->commands_outstanding;
}

/*  
 *  This card is the opposite of the other cards.  
 *   0 turns interrupts on... 
 *   0x08 turns them off... 
 */
static void SA5_intr_mask(ctlr_info_t *h, unsigned long val)
{
	if (val) 
	{ /* Turn interrupts on */
		h->interrupts_enabled = 1;
		writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	} else /* Turn them off */
	{
		h->interrupts_enabled = 0;
        	writel( SA5_INTR_OFF, 
			h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	}
}
/*
 *  This card is the opposite of the other cards.
 *   0 turns interrupts on...
 *   0x04 turns them off...
 */
static void SA5B_intr_mask(ctlr_info_t *h, unsigned long val)
{
        if (val)
        { /* Turn interrupts on */
		h->interrupts_enabled = 1;
                writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
        } else /* Turn them off */
        {
		h->interrupts_enabled = 0;
                writel( SA5B_INTR_OFF,
                        h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
        }
}

/* Performant mode intr_mask */
static void SA5_performant_intr_mask(ctlr_info_t *h, unsigned long val)
{
	if (val) { /* turn on interrupts */
		h->interrupts_enabled = 1;
		writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	} else {
		h->interrupts_enabled = 0;
		writel(SA5_PERF_INTR_OFF,
				h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	}
}

/*
 *  Returns true if fifo is full.  
 * 
 */ 
static unsigned long SA5_fifo_full(ctlr_info_t *h)
{
	if( h->commands_outstanding >= h->max_commands)
		return(1);
	else 
		return(0);

}
/* 
 *   returns value read from hardware. 
 *     returns FIFO_EMPTY if there is nothing to read 
 */ 
static unsigned long SA5_completed(ctlr_info_t *h)
{
	unsigned long register_value 
		= readl(h->vaddr + SA5_REPLY_PORT_OFFSET);
	if(register_value != FIFO_EMPTY)
	{
		h->commands_outstanding--;
#ifdef CCISS_DEBUG
		printk("cciss:  Read %lx back from board\n", register_value);
#endif /* CCISS_DEBUG */ 
	} 
#ifdef CCISS_DEBUG
	else
	{
		printk("cciss:  FIFO Empty read\n");
	}
#endif 
	return ( register_value); 

}

/* Performant mode command completed */
static unsigned long SA5_performant_completed(ctlr_info_t *h)
{
	unsigned long register_value = FIFO_EMPTY;

	/* flush the controller write of the reply queue by reading
	 * outbound doorbell status register.
	 */
	register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
	/* msi auto clears the interrupt pending bit. */
	if (!(h->msi_vector || h->msix_vector)) {
		writel(SA5_OUTDB_CLEAR_PERF_BIT, h->vaddr + SA5_OUTDB_CLEAR);
		/* Do a read in order to flush the write to the controller
		 * (as per spec.)
		 */
		register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
	}

	if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
		register_value = *(h->reply_pool_head);
		(h->reply_pool_head)++;
		h->commands_outstanding--;
	} else {
		register_value = FIFO_EMPTY;
	}
	/* Check for wraparound */
	if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
		h->reply_pool_head = h->reply_pool;
		h->reply_pool_wraparound ^= 1;
	}

	return register_value;
}
/*
 *	Returns true if an interrupt is pending.. 
 */
static bool SA5_intr_pending(ctlr_info_t *h)
{
	unsigned long register_value  = 
		readl(h->vaddr + SA5_INTR_STATUS);
#ifdef CCISS_DEBUG
	printk("cciss: intr_pending %lx\n", register_value);
#endif  /* CCISS_DEBUG */
	if( register_value &  SA5_INTR_PENDING) 
		return  1;	
	return 0 ;
}

/*
 *      Returns true if an interrupt is pending..
 */
static bool SA5B_intr_pending(ctlr_info_t *h)
{
        unsigned long register_value  =
                readl(h->vaddr + SA5_INTR_STATUS);
#ifdef CCISS_DEBUG
        printk("cciss: intr_pending %lx\n", register_value);
#endif  /* CCISS_DEBUG */
        if( register_value &  SA5B_INTR_PENDING)
                return  1;
        return 0 ;
}

static bool SA5_performant_intr_pending(ctlr_info_t *h)
{
	unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);

	if (!register_value)
		return false;

	if (h->msi_vector || h->msix_vector)
		return true;

	/* Read outbound doorbell to flush */
	register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
	return register_value & SA5_OUTDB_STATUS_PERF_BIT;
}

static struct access_method SA5_access = {
	SA5_submit_command,
	SA5_intr_mask,
	SA5_fifo_full,
	SA5_intr_pending,
	SA5_completed,
};

static struct access_method SA5B_access = {
        SA5_submit_command,
        SA5B_intr_mask,
        SA5_fifo_full,
        SA5B_intr_pending,
        SA5_completed,
};

static struct access_method SA5_performant_access = {
	SA5_submit_command,
	SA5_performant_intr_mask,
	SA5_fifo_full,
	SA5_performant_intr_pending,
	SA5_performant_completed,
};

struct board_type {
	__u32	board_id;
	char	*product_name;
	struct access_method *access;
	int nr_cmds; /* Max cmds this kind of ctlr can handle. */
};

#define CCISS_LOCK(i)	(&hba[i]->lock)

#endif /* CCISS_H */