blob: 82effce97c514601dfbc3f5d9f5e953fe98bcd5b [file] [log] [blame]
Grant Likely74489a92007-07-17 04:03:39 -07001/*
2 * Xilinx SystemACE device driver
3 *
4 * Copyright 2007 Secret Lab Technologies Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 */
10
11/*
12 * The SystemACE chip is designed to configure FPGAs by loading an FPGA
13 * bitstream from a file on a CF card and squirting it into FPGAs connected
14 * to the SystemACE JTAG chain. It also has the advantage of providing an
15 * MPU interface which can be used to control the FPGA configuration process
16 * and to use the attached CF card for general purpose storage.
17 *
18 * This driver is a block device driver for the SystemACE.
19 *
20 * Initialization:
21 * The driver registers itself as a platform_device driver at module
22 * load time. The platform bus will take care of calling the
23 * ace_probe() method for all SystemACE instances in the system. Any
24 * number of SystemACE instances are supported. ace_probe() calls
25 * ace_setup() which initialized all data structures, reads the CF
26 * id structure and registers the device.
27 *
28 * Processing:
29 * Just about all of the heavy lifting in this driver is performed by
30 * a Finite State Machine (FSM). The driver needs to wait on a number
31 * of events; some raised by interrupts, some which need to be polled
32 * for. Describing all of the behaviour in a FSM seems to be the
33 * easiest way to keep the complexity low and make it easy to
34 * understand what the driver is doing. If the block ops or the
35 * request function need to interact with the hardware, then they
36 * simply need to flag the request and kick of FSM processing.
37 *
38 * The FSM itself is atomic-safe code which can be run from any
39 * context. The general process flow is:
40 * 1. obtain the ace->lock spinlock.
41 * 2. loop on ace_fsm_dostate() until the ace->fsm_continue flag is
42 * cleared.
43 * 3. release the lock.
44 *
45 * Individual states do not sleep in any way. If a condition needs to
46 * be waited for then the state much clear the fsm_continue flag and
47 * either schedule the FSM to be run again at a later time, or expect
48 * an interrupt to call the FSM when the desired condition is met.
49 *
50 * In normal operation, the FSM is processed at interrupt context
51 * either when the driver's tasklet is scheduled, or when an irq is
52 * raised by the hardware. The tasklet can be scheduled at any time.
53 * The request method in particular schedules the tasklet when a new
54 * request has been indicated by the block layer. Once started, the
55 * FSM proceeds as far as it can processing the request until it
56 * needs on a hardware event. At this point, it must yield execution.
57 *
58 * A state has two options when yielding execution:
59 * 1. ace_fsm_yield()
60 * - Call if need to poll for event.
61 * - clears the fsm_continue flag to exit the processing loop
62 * - reschedules the tasklet to run again as soon as possible
63 * 2. ace_fsm_yieldirq()
64 * - Call if an irq is expected from the HW
65 * - clears the fsm_continue flag to exit the processing loop
66 * - does not reschedule the tasklet so the FSM will not be processed
67 * again until an irq is received.
68 * After calling a yield function, the state must return control back
69 * to the FSM main loop.
70 *
71 * Additionally, the driver maintains a kernel timer which can process
72 * the FSM. If the FSM gets stalled, typically due to a missed
73 * interrupt, then the kernel timer will expire and the driver can
74 * continue where it left off.
75 *
76 * To Do:
77 * - Add FPGA configuration control interface.
78 * - Request major number from lanana
79 */
80
81#undef DEBUG
82
83#include <linux/module.h>
84#include <linux/ctype.h>
85#include <linux/init.h>
86#include <linux/interrupt.h>
87#include <linux/errno.h>
88#include <linux/kernel.h>
89#include <linux/delay.h>
90#include <linux/slab.h>
91#include <linux/blkdev.h>
92#include <linux/hdreg.h>
93#include <linux/platform_device.h>
Grant Likely95e896c2007-10-01 16:33:55 +020094#if defined(CONFIG_OF)
95#include <linux/of_device.h>
96#include <linux/of_platform.h>
97#endif
Grant Likely74489a92007-07-17 04:03:39 -070098
99MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
100MODULE_DESCRIPTION("Xilinx SystemACE device driver");
101MODULE_LICENSE("GPL");
102
103/* SystemACE register definitions */
104#define ACE_BUSMODE (0x00)
105
106#define ACE_STATUS (0x04)
107#define ACE_STATUS_CFGLOCK (0x00000001)
108#define ACE_STATUS_MPULOCK (0x00000002)
109#define ACE_STATUS_CFGERROR (0x00000004) /* config controller error */
110#define ACE_STATUS_CFCERROR (0x00000008) /* CF controller error */
111#define ACE_STATUS_CFDETECT (0x00000010)
112#define ACE_STATUS_DATABUFRDY (0x00000020)
113#define ACE_STATUS_DATABUFMODE (0x00000040)
114#define ACE_STATUS_CFGDONE (0x00000080)
115#define ACE_STATUS_RDYFORCFCMD (0x00000100)
116#define ACE_STATUS_CFGMODEPIN (0x00000200)
117#define ACE_STATUS_CFGADDR_MASK (0x0000e000)
118#define ACE_STATUS_CFBSY (0x00020000)
119#define ACE_STATUS_CFRDY (0x00040000)
120#define ACE_STATUS_CFDWF (0x00080000)
121#define ACE_STATUS_CFDSC (0x00100000)
122#define ACE_STATUS_CFDRQ (0x00200000)
123#define ACE_STATUS_CFCORR (0x00400000)
124#define ACE_STATUS_CFERR (0x00800000)
125
126#define ACE_ERROR (0x08)
127#define ACE_CFGLBA (0x0c)
128#define ACE_MPULBA (0x10)
129
130#define ACE_SECCNTCMD (0x14)
131#define ACE_SECCNTCMD_RESET (0x0100)
132#define ACE_SECCNTCMD_IDENTIFY (0x0200)
133#define ACE_SECCNTCMD_READ_DATA (0x0300)
134#define ACE_SECCNTCMD_WRITE_DATA (0x0400)
135#define ACE_SECCNTCMD_ABORT (0x0600)
136
137#define ACE_VERSION (0x16)
138#define ACE_VERSION_REVISION_MASK (0x00FF)
139#define ACE_VERSION_MINOR_MASK (0x0F00)
140#define ACE_VERSION_MAJOR_MASK (0xF000)
141
142#define ACE_CTRL (0x18)
143#define ACE_CTRL_FORCELOCKREQ (0x0001)
144#define ACE_CTRL_LOCKREQ (0x0002)
145#define ACE_CTRL_FORCECFGADDR (0x0004)
146#define ACE_CTRL_FORCECFGMODE (0x0008)
147#define ACE_CTRL_CFGMODE (0x0010)
148#define ACE_CTRL_CFGSTART (0x0020)
149#define ACE_CTRL_CFGSEL (0x0040)
150#define ACE_CTRL_CFGRESET (0x0080)
151#define ACE_CTRL_DATABUFRDYIRQ (0x0100)
152#define ACE_CTRL_ERRORIRQ (0x0200)
153#define ACE_CTRL_CFGDONEIRQ (0x0400)
154#define ACE_CTRL_RESETIRQ (0x0800)
155#define ACE_CTRL_CFGPROG (0x1000)
156#define ACE_CTRL_CFGADDR_MASK (0xe000)
157
158#define ACE_FATSTAT (0x1c)
159
160#define ACE_NUM_MINORS 16
161#define ACE_SECTOR_SIZE (512)
162#define ACE_FIFO_SIZE (32)
163#define ACE_BUF_PER_SECTOR (ACE_SECTOR_SIZE / ACE_FIFO_SIZE)
164
Grant Likely4a24d862007-10-01 16:33:54 +0200165#define ACE_BUS_WIDTH_8 0
166#define ACE_BUS_WIDTH_16 1
167
Grant Likely74489a92007-07-17 04:03:39 -0700168struct ace_reg_ops;
169
170struct ace_device {
171 /* driver state data */
172 int id;
173 int media_change;
174 int users;
175 struct list_head list;
176
177 /* finite state machine data */
178 struct tasklet_struct fsm_tasklet;
179 uint fsm_task; /* Current activity (ACE_TASK_*) */
180 uint fsm_state; /* Current state (ACE_FSM_STATE_*) */
181 uint fsm_continue_flag; /* cleared to exit FSM mainloop */
182 uint fsm_iter_num;
183 struct timer_list stall_timer;
184
185 /* Transfer state/result, use for both id and block request */
186 struct request *req; /* request being processed */
187 void *data_ptr; /* pointer to I/O buffer */
188 int data_count; /* number of buffers remaining */
189 int data_result; /* Result of transfer; 0 := success */
190
191 int id_req_count; /* count of id requests */
192 int id_result;
193 struct completion id_completion; /* used when id req finishes */
194 int in_irq;
195
196 /* Details of hardware device */
197 unsigned long physaddr;
Grant Likelyb5515d82007-10-04 08:52:39 +0200198 void __iomem *baseaddr;
Grant Likely74489a92007-07-17 04:03:39 -0700199 int irq;
200 int bus_width; /* 0 := 8 bit; 1 := 16 bit */
201 struct ace_reg_ops *reg_ops;
202 int lock_count;
203
204 /* Block device data structures */
205 spinlock_t lock;
206 struct device *dev;
207 struct request_queue *queue;
208 struct gendisk *gd;
209
210 /* Inserted CF card parameters */
211 struct hd_driveid cf_id;
212};
213
214static int ace_major;
215
216/* ---------------------------------------------------------------------
217 * Low level register access
218 */
219
220struct ace_reg_ops {
221 u16(*in) (struct ace_device * ace, int reg);
222 void (*out) (struct ace_device * ace, int reg, u16 val);
223 void (*datain) (struct ace_device * ace);
224 void (*dataout) (struct ace_device * ace);
225};
226
227/* 8 Bit bus width */
228static u16 ace_in_8(struct ace_device *ace, int reg)
229{
Grant Likelyb5515d82007-10-04 08:52:39 +0200230 void __iomem *r = ace->baseaddr + reg;
Grant Likely74489a92007-07-17 04:03:39 -0700231 return in_8(r) | (in_8(r + 1) << 8);
232}
233
234static void ace_out_8(struct ace_device *ace, int reg, u16 val)
235{
Grant Likelyb5515d82007-10-04 08:52:39 +0200236 void __iomem *r = ace->baseaddr + reg;
Grant Likely74489a92007-07-17 04:03:39 -0700237 out_8(r, val);
238 out_8(r + 1, val >> 8);
239}
240
241static void ace_datain_8(struct ace_device *ace)
242{
Grant Likelyb5515d82007-10-04 08:52:39 +0200243 void __iomem *r = ace->baseaddr + 0x40;
Grant Likely74489a92007-07-17 04:03:39 -0700244 u8 *dst = ace->data_ptr;
245 int i = ACE_FIFO_SIZE;
246 while (i--)
247 *dst++ = in_8(r++);
248 ace->data_ptr = dst;
249}
250
251static void ace_dataout_8(struct ace_device *ace)
252{
Grant Likelyb5515d82007-10-04 08:52:39 +0200253 void __iomem *r = ace->baseaddr + 0x40;
Grant Likely74489a92007-07-17 04:03:39 -0700254 u8 *src = ace->data_ptr;
255 int i = ACE_FIFO_SIZE;
256 while (i--)
257 out_8(r++, *src++);
258 ace->data_ptr = src;
259}
260
261static struct ace_reg_ops ace_reg_8_ops = {
262 .in = ace_in_8,
263 .out = ace_out_8,
264 .datain = ace_datain_8,
265 .dataout = ace_dataout_8,
266};
267
268/* 16 bit big endian bus attachment */
269static u16 ace_in_be16(struct ace_device *ace, int reg)
270{
271 return in_be16(ace->baseaddr + reg);
272}
273
274static void ace_out_be16(struct ace_device *ace, int reg, u16 val)
275{
276 out_be16(ace->baseaddr + reg, val);
277}
278
279static void ace_datain_be16(struct ace_device *ace)
280{
281 int i = ACE_FIFO_SIZE / 2;
282 u16 *dst = ace->data_ptr;
283 while (i--)
284 *dst++ = in_le16(ace->baseaddr + 0x40);
285 ace->data_ptr = dst;
286}
287
288static void ace_dataout_be16(struct ace_device *ace)
289{
290 int i = ACE_FIFO_SIZE / 2;
291 u16 *src = ace->data_ptr;
292 while (i--)
293 out_le16(ace->baseaddr + 0x40, *src++);
294 ace->data_ptr = src;
295}
296
297/* 16 bit little endian bus attachment */
298static u16 ace_in_le16(struct ace_device *ace, int reg)
299{
300 return in_le16(ace->baseaddr + reg);
301}
302
303static void ace_out_le16(struct ace_device *ace, int reg, u16 val)
304{
305 out_le16(ace->baseaddr + reg, val);
306}
307
308static void ace_datain_le16(struct ace_device *ace)
309{
310 int i = ACE_FIFO_SIZE / 2;
311 u16 *dst = ace->data_ptr;
312 while (i--)
313 *dst++ = in_be16(ace->baseaddr + 0x40);
314 ace->data_ptr = dst;
315}
316
317static void ace_dataout_le16(struct ace_device *ace)
318{
319 int i = ACE_FIFO_SIZE / 2;
320 u16 *src = ace->data_ptr;
321 while (i--)
322 out_be16(ace->baseaddr + 0x40, *src++);
323 ace->data_ptr = src;
324}
325
326static struct ace_reg_ops ace_reg_be16_ops = {
327 .in = ace_in_be16,
328 .out = ace_out_be16,
329 .datain = ace_datain_be16,
330 .dataout = ace_dataout_be16,
331};
332
333static struct ace_reg_ops ace_reg_le16_ops = {
334 .in = ace_in_le16,
335 .out = ace_out_le16,
336 .datain = ace_datain_le16,
337 .dataout = ace_dataout_le16,
338};
339
340static inline u16 ace_in(struct ace_device *ace, int reg)
341{
342 return ace->reg_ops->in(ace, reg);
343}
344
345static inline u32 ace_in32(struct ace_device *ace, int reg)
346{
347 return ace_in(ace, reg) | (ace_in(ace, reg + 2) << 16);
348}
349
350static inline void ace_out(struct ace_device *ace, int reg, u16 val)
351{
352 ace->reg_ops->out(ace, reg, val);
353}
354
355static inline void ace_out32(struct ace_device *ace, int reg, u32 val)
356{
357 ace_out(ace, reg, val);
358 ace_out(ace, reg + 2, val >> 16);
359}
360
361/* ---------------------------------------------------------------------
362 * Debug support functions
363 */
364
365#if defined(DEBUG)
366static void ace_dump_mem(void *base, int len)
367{
368 const char *ptr = base;
369 int i, j;
370
371 for (i = 0; i < len; i += 16) {
372 printk(KERN_INFO "%.8x:", i);
373 for (j = 0; j < 16; j++) {
374 if (!(j % 4))
375 printk(" ");
376 printk("%.2x", ptr[i + j]);
377 }
378 printk(" ");
379 for (j = 0; j < 16; j++)
380 printk("%c", isprint(ptr[i + j]) ? ptr[i + j] : '.');
381 printk("\n");
382 }
383}
384#else
385static inline void ace_dump_mem(void *base, int len)
386{
387}
388#endif
389
390static void ace_dump_regs(struct ace_device *ace)
391{
392 dev_info(ace->dev, " ctrl: %.8x seccnt/cmd: %.4x ver:%.4x\n"
Joe Perches898eb712007-10-18 03:06:30 -0700393 KERN_INFO " status:%.8x mpu_lba:%.8x busmode:%4x\n"
394 KERN_INFO " error: %.8x cfg_lba:%.8x fatstat:%.4x\n",
Grant Likely74489a92007-07-17 04:03:39 -0700395 ace_in32(ace, ACE_CTRL),
396 ace_in(ace, ACE_SECCNTCMD),
397 ace_in(ace, ACE_VERSION),
398 ace_in32(ace, ACE_STATUS),
399 ace_in32(ace, ACE_MPULBA),
400 ace_in(ace, ACE_BUSMODE),
401 ace_in32(ace, ACE_ERROR),
402 ace_in32(ace, ACE_CFGLBA), ace_in(ace, ACE_FATSTAT));
403}
404
405void ace_fix_driveid(struct hd_driveid *id)
406{
407#if defined(__BIG_ENDIAN)
408 u16 *buf = (void *)id;
409 int i;
410
411 /* All half words have wrong byte order; swap the bytes */
412 for (i = 0; i < sizeof(struct hd_driveid); i += 2, buf++)
413 *buf = le16_to_cpu(*buf);
414
415 /* Some of the data values are 32bit; swap the half words */
416 id->lba_capacity = ((id->lba_capacity >> 16) & 0x0000FFFF) |
417 ((id->lba_capacity << 16) & 0xFFFF0000);
418 id->spg = ((id->spg >> 16) & 0x0000FFFF) |
419 ((id->spg << 16) & 0xFFFF0000);
420#endif
421}
422
423/* ---------------------------------------------------------------------
424 * Finite State Machine (FSM) implementation
425 */
426
427/* FSM tasks; used to direct state transitions */
428#define ACE_TASK_IDLE 0
429#define ACE_TASK_IDENTIFY 1
430#define ACE_TASK_READ 2
431#define ACE_TASK_WRITE 3
432#define ACE_FSM_NUM_TASKS 4
433
434/* FSM state definitions */
435#define ACE_FSM_STATE_IDLE 0
436#define ACE_FSM_STATE_REQ_LOCK 1
437#define ACE_FSM_STATE_WAIT_LOCK 2
438#define ACE_FSM_STATE_WAIT_CFREADY 3
439#define ACE_FSM_STATE_IDENTIFY_PREPARE 4
440#define ACE_FSM_STATE_IDENTIFY_TRANSFER 5
441#define ACE_FSM_STATE_IDENTIFY_COMPLETE 6
442#define ACE_FSM_STATE_REQ_PREPARE 7
443#define ACE_FSM_STATE_REQ_TRANSFER 8
444#define ACE_FSM_STATE_REQ_COMPLETE 9
445#define ACE_FSM_STATE_ERROR 10
446#define ACE_FSM_NUM_STATES 11
447
448/* Set flag to exit FSM loop and reschedule tasklet */
449static inline void ace_fsm_yield(struct ace_device *ace)
450{
451 dev_dbg(ace->dev, "ace_fsm_yield()\n");
452 tasklet_schedule(&ace->fsm_tasklet);
453 ace->fsm_continue_flag = 0;
454}
455
456/* Set flag to exit FSM loop and wait for IRQ to reschedule tasklet */
457static inline void ace_fsm_yieldirq(struct ace_device *ace)
458{
459 dev_dbg(ace->dev, "ace_fsm_yieldirq()\n");
460
461 if (ace->irq == NO_IRQ)
462 /* No IRQ assigned, so need to poll */
463 tasklet_schedule(&ace->fsm_tasklet);
464 ace->fsm_continue_flag = 0;
465}
466
467/* Get the next read/write request; ending requests that we don't handle */
Jens Axboe165125e2007-07-24 09:28:11 +0200468struct request *ace_get_next_request(struct request_queue * q)
Grant Likely74489a92007-07-17 04:03:39 -0700469{
470 struct request *req;
471
472 while ((req = elv_next_request(q)) != NULL) {
473 if (blk_fs_request(req))
474 break;
475 end_request(req, 0);
476 }
477 return req;
478}
479
480static void ace_fsm_dostate(struct ace_device *ace)
481{
482 struct request *req;
483 u32 status;
484 u16 val;
485 int count;
486 int i;
487
488#if defined(DEBUG)
489 dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
490 ace->fsm_state, ace->id_req_count);
491#endif
492
493 switch (ace->fsm_state) {
494 case ACE_FSM_STATE_IDLE:
495 /* See if there is anything to do */
496 if (ace->id_req_count || ace_get_next_request(ace->queue)) {
497 ace->fsm_iter_num++;
498 ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
499 mod_timer(&ace->stall_timer, jiffies + HZ);
500 if (!timer_pending(&ace->stall_timer))
501 add_timer(&ace->stall_timer);
502 break;
503 }
504 del_timer(&ace->stall_timer);
505 ace->fsm_continue_flag = 0;
506 break;
507
508 case ACE_FSM_STATE_REQ_LOCK:
509 if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
510 /* Already have the lock, jump to next state */
511 ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
512 break;
513 }
514
515 /* Request the lock */
516 val = ace_in(ace, ACE_CTRL);
517 ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
518 ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
519 break;
520
521 case ACE_FSM_STATE_WAIT_LOCK:
522 if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
523 /* got the lock; move to next state */
524 ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
525 break;
526 }
527
528 /* wait a bit for the lock */
529 ace_fsm_yield(ace);
530 break;
531
532 case ACE_FSM_STATE_WAIT_CFREADY:
533 status = ace_in32(ace, ACE_STATUS);
534 if (!(status & ACE_STATUS_RDYFORCFCMD) ||
535 (status & ACE_STATUS_CFBSY)) {
536 /* CF card isn't ready; it needs to be polled */
537 ace_fsm_yield(ace);
538 break;
539 }
540
541 /* Device is ready for command; determine what to do next */
542 if (ace->id_req_count)
543 ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
544 else
545 ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
546 break;
547
548 case ACE_FSM_STATE_IDENTIFY_PREPARE:
549 /* Send identify command */
550 ace->fsm_task = ACE_TASK_IDENTIFY;
551 ace->data_ptr = &ace->cf_id;
552 ace->data_count = ACE_BUF_PER_SECTOR;
553 ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);
554
555 /* As per datasheet, put config controller in reset */
556 val = ace_in(ace, ACE_CTRL);
557 ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
558
559 /* irq handler takes over from this point; wait for the
560 * transfer to complete */
561 ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
562 ace_fsm_yieldirq(ace);
563 break;
564
565 case ACE_FSM_STATE_IDENTIFY_TRANSFER:
566 /* Check that the sysace is ready to receive data */
567 status = ace_in32(ace, ACE_STATUS);
568 if (status & ACE_STATUS_CFBSY) {
569 dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
570 ace->fsm_task, ace->fsm_iter_num,
571 ace->data_count);
572 ace_fsm_yield(ace);
573 break;
574 }
575 if (!(status & ACE_STATUS_DATABUFRDY)) {
576 ace_fsm_yield(ace);
577 break;
578 }
579
580 /* Transfer the next buffer */
581 ace->reg_ops->datain(ace);
582 ace->data_count--;
583
584 /* If there are still buffers to be transfers; jump out here */
585 if (ace->data_count != 0) {
586 ace_fsm_yieldirq(ace);
587 break;
588 }
589
590 /* transfer finished; kick state machine */
591 dev_dbg(ace->dev, "identify finished\n");
592 ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
593 break;
594
595 case ACE_FSM_STATE_IDENTIFY_COMPLETE:
596 ace_fix_driveid(&ace->cf_id);
597 ace_dump_mem(&ace->cf_id, 512); /* Debug: Dump out disk ID */
598
599 if (ace->data_result) {
600 /* Error occured, disable the disk */
601 ace->media_change = 1;
602 set_capacity(ace->gd, 0);
603 dev_err(ace->dev, "error fetching CF id (%i)\n",
604 ace->data_result);
605 } else {
606 ace->media_change = 0;
607
608 /* Record disk parameters */
609 set_capacity(ace->gd, ace->cf_id.lba_capacity);
610 dev_info(ace->dev, "capacity: %i sectors\n",
611 ace->cf_id.lba_capacity);
612 }
613
614 /* We're done, drop to IDLE state and notify waiters */
615 ace->fsm_state = ACE_FSM_STATE_IDLE;
616 ace->id_result = ace->data_result;
617 while (ace->id_req_count) {
618 complete(&ace->id_completion);
619 ace->id_req_count--;
620 }
621 break;
622
623 case ACE_FSM_STATE_REQ_PREPARE:
624 req = ace_get_next_request(ace->queue);
625 if (!req) {
626 ace->fsm_state = ACE_FSM_STATE_IDLE;
627 break;
628 }
629
630 /* Okay, it's a data request, set it up for transfer */
631 dev_dbg(ace->dev,
632 "request: sec=%lx hcnt=%lx, ccnt=%x, dir=%i\n",
633 req->sector, req->hard_nr_sectors,
634 req->current_nr_sectors, rq_data_dir(req));
635
636 ace->req = req;
637 ace->data_ptr = req->buffer;
638 ace->data_count = req->current_nr_sectors * ACE_BUF_PER_SECTOR;
639 ace_out32(ace, ACE_MPULBA, req->sector & 0x0FFFFFFF);
640
641 count = req->hard_nr_sectors;
642 if (rq_data_dir(req)) {
643 /* Kick off write request */
644 dev_dbg(ace->dev, "write data\n");
645 ace->fsm_task = ACE_TASK_WRITE;
646 ace_out(ace, ACE_SECCNTCMD,
647 count | ACE_SECCNTCMD_WRITE_DATA);
648 } else {
649 /* Kick off read request */
650 dev_dbg(ace->dev, "read data\n");
651 ace->fsm_task = ACE_TASK_READ;
652 ace_out(ace, ACE_SECCNTCMD,
653 count | ACE_SECCNTCMD_READ_DATA);
654 }
655
656 /* As per datasheet, put config controller in reset */
657 val = ace_in(ace, ACE_CTRL);
658 ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
659
660 /* Move to the transfer state. The systemace will raise
661 * an interrupt once there is something to do
662 */
663 ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
664 if (ace->fsm_task == ACE_TASK_READ)
665 ace_fsm_yieldirq(ace); /* wait for data ready */
666 break;
667
668 case ACE_FSM_STATE_REQ_TRANSFER:
669 /* Check that the sysace is ready to receive data */
670 status = ace_in32(ace, ACE_STATUS);
671 if (status & ACE_STATUS_CFBSY) {
672 dev_dbg(ace->dev,
673 "CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
674 ace->fsm_task, ace->fsm_iter_num,
675 ace->req->current_nr_sectors * 16,
676 ace->data_count, ace->in_irq);
677 ace_fsm_yield(ace); /* need to poll CFBSY bit */
678 break;
679 }
680 if (!(status & ACE_STATUS_DATABUFRDY)) {
681 dev_dbg(ace->dev,
682 "DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
683 ace->fsm_task, ace->fsm_iter_num,
684 ace->req->current_nr_sectors * 16,
685 ace->data_count, ace->in_irq);
686 ace_fsm_yieldirq(ace);
687 break;
688 }
689
690 /* Transfer the next buffer */
691 i = 16;
692 if (ace->fsm_task == ACE_TASK_WRITE)
693 ace->reg_ops->dataout(ace);
694 else
695 ace->reg_ops->datain(ace);
696 ace->data_count--;
697
698 /* If there are still buffers to be transfers; jump out here */
699 if (ace->data_count != 0) {
700 ace_fsm_yieldirq(ace);
701 break;
702 }
703
704 /* bio finished; is there another one? */
705 i = ace->req->current_nr_sectors;
706 if (end_that_request_first(ace->req, 1, i)) {
707 /* dev_dbg(ace->dev, "next block; h=%li c=%i\n",
708 * ace->req->hard_nr_sectors,
709 * ace->req->current_nr_sectors);
710 */
711 ace->data_ptr = ace->req->buffer;
712 ace->data_count = ace->req->current_nr_sectors * 16;
713 ace_fsm_yieldirq(ace);
714 break;
715 }
716
717 ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
718 break;
719
720 case ACE_FSM_STATE_REQ_COMPLETE:
721 /* Complete the block request */
722 blkdev_dequeue_request(ace->req);
723 end_that_request_last(ace->req, 1);
724 ace->req = NULL;
725
726 /* Finished request; go to idle state */
727 ace->fsm_state = ACE_FSM_STATE_IDLE;
728 break;
729
730 default:
731 ace->fsm_state = ACE_FSM_STATE_IDLE;
732 break;
733 }
734}
735
736static void ace_fsm_tasklet(unsigned long data)
737{
738 struct ace_device *ace = (void *)data;
739 unsigned long flags;
740
741 spin_lock_irqsave(&ace->lock, flags);
742
743 /* Loop over state machine until told to stop */
744 ace->fsm_continue_flag = 1;
745 while (ace->fsm_continue_flag)
746 ace_fsm_dostate(ace);
747
748 spin_unlock_irqrestore(&ace->lock, flags);
749}
750
751static void ace_stall_timer(unsigned long data)
752{
753 struct ace_device *ace = (void *)data;
754 unsigned long flags;
755
756 dev_warn(ace->dev,
757 "kicking stalled fsm; state=%i task=%i iter=%i dc=%i\n",
758 ace->fsm_state, ace->fsm_task, ace->fsm_iter_num,
759 ace->data_count);
760 spin_lock_irqsave(&ace->lock, flags);
761
762 /* Rearm the stall timer *before* entering FSM (which may then
763 * delete the timer) */
764 mod_timer(&ace->stall_timer, jiffies + HZ);
765
766 /* Loop over state machine until told to stop */
767 ace->fsm_continue_flag = 1;
768 while (ace->fsm_continue_flag)
769 ace_fsm_dostate(ace);
770
771 spin_unlock_irqrestore(&ace->lock, flags);
772}
773
774/* ---------------------------------------------------------------------
775 * Interrupt handling routines
776 */
777static int ace_interrupt_checkstate(struct ace_device *ace)
778{
779 u32 sreg = ace_in32(ace, ACE_STATUS);
780 u16 creg = ace_in(ace, ACE_CTRL);
781
782 /* Check for error occurance */
783 if ((sreg & (ACE_STATUS_CFGERROR | ACE_STATUS_CFCERROR)) &&
784 (creg & ACE_CTRL_ERRORIRQ)) {
785 dev_err(ace->dev, "transfer failure\n");
786 ace_dump_regs(ace);
787 return -EIO;
788 }
789
790 return 0;
791}
792
793static irqreturn_t ace_interrupt(int irq, void *dev_id)
794{
795 u16 creg;
796 struct ace_device *ace = dev_id;
797
798 /* be safe and get the lock */
799 spin_lock(&ace->lock);
800 ace->in_irq = 1;
801
802 /* clear the interrupt */
803 creg = ace_in(ace, ACE_CTRL);
804 ace_out(ace, ACE_CTRL, creg | ACE_CTRL_RESETIRQ);
805 ace_out(ace, ACE_CTRL, creg);
806
807 /* check for IO failures */
808 if (ace_interrupt_checkstate(ace))
809 ace->data_result = -EIO;
810
811 if (ace->fsm_task == 0) {
812 dev_err(ace->dev,
813 "spurious irq; stat=%.8x ctrl=%.8x cmd=%.4x\n",
814 ace_in32(ace, ACE_STATUS), ace_in32(ace, ACE_CTRL),
815 ace_in(ace, ACE_SECCNTCMD));
816 dev_err(ace->dev, "fsm_task=%i fsm_state=%i data_count=%i\n",
817 ace->fsm_task, ace->fsm_state, ace->data_count);
818 }
819
820 /* Loop over state machine until told to stop */
821 ace->fsm_continue_flag = 1;
822 while (ace->fsm_continue_flag)
823 ace_fsm_dostate(ace);
824
825 /* done with interrupt; drop the lock */
826 ace->in_irq = 0;
827 spin_unlock(&ace->lock);
828
829 return IRQ_HANDLED;
830}
831
832/* ---------------------------------------------------------------------
833 * Block ops
834 */
Jens Axboe165125e2007-07-24 09:28:11 +0200835static void ace_request(struct request_queue * q)
Grant Likely74489a92007-07-17 04:03:39 -0700836{
837 struct request *req;
838 struct ace_device *ace;
839
840 req = ace_get_next_request(q);
841
842 if (req) {
843 ace = req->rq_disk->private_data;
844 tasklet_schedule(&ace->fsm_tasklet);
845 }
846}
847
848static int ace_media_changed(struct gendisk *gd)
849{
850 struct ace_device *ace = gd->private_data;
851 dev_dbg(ace->dev, "ace_media_changed(): %i\n", ace->media_change);
852
853 return ace->media_change;
854}
855
856static int ace_revalidate_disk(struct gendisk *gd)
857{
858 struct ace_device *ace = gd->private_data;
859 unsigned long flags;
860
861 dev_dbg(ace->dev, "ace_revalidate_disk()\n");
862
863 if (ace->media_change) {
864 dev_dbg(ace->dev, "requesting cf id and scheduling tasklet\n");
865
866 spin_lock_irqsave(&ace->lock, flags);
867 ace->id_req_count++;
868 spin_unlock_irqrestore(&ace->lock, flags);
869
870 tasklet_schedule(&ace->fsm_tasklet);
871 wait_for_completion(&ace->id_completion);
872 }
873
874 dev_dbg(ace->dev, "revalidate complete\n");
875 return ace->id_result;
876}
877
878static int ace_open(struct inode *inode, struct file *filp)
879{
880 struct ace_device *ace = inode->i_bdev->bd_disk->private_data;
881 unsigned long flags;
882
883 dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);
884
885 filp->private_data = ace;
886 spin_lock_irqsave(&ace->lock, flags);
887 ace->users++;
888 spin_unlock_irqrestore(&ace->lock, flags);
889
890 check_disk_change(inode->i_bdev);
891 return 0;
892}
893
894static int ace_release(struct inode *inode, struct file *filp)
895{
896 struct ace_device *ace = inode->i_bdev->bd_disk->private_data;
897 unsigned long flags;
898 u16 val;
899
900 dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);
901
902 spin_lock_irqsave(&ace->lock, flags);
903 ace->users--;
904 if (ace->users == 0) {
905 val = ace_in(ace, ACE_CTRL);
906 ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
907 }
908 spin_unlock_irqrestore(&ace->lock, flags);
909 return 0;
910}
911
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200912static int ace_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Grant Likely74489a92007-07-17 04:03:39 -0700913{
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200914 struct ace_device *ace = bdev->bd_disk->private_data;
Grant Likely74489a92007-07-17 04:03:39 -0700915
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200916 dev_dbg(ace->dev, "ace_getgeo()\n");
Grant Likely74489a92007-07-17 04:03:39 -0700917
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200918 geo->heads = ace->cf_id.heads;
919 geo->sectors = ace->cf_id.sectors;
920 geo->cylinders = ace->cf_id.cyls;
921
922 return 0;
Grant Likely74489a92007-07-17 04:03:39 -0700923}
924
925static struct block_device_operations ace_fops = {
926 .owner = THIS_MODULE,
927 .open = ace_open,
928 .release = ace_release,
929 .media_changed = ace_media_changed,
930 .revalidate_disk = ace_revalidate_disk,
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200931 .getgeo = ace_getgeo,
Grant Likely74489a92007-07-17 04:03:39 -0700932};
933
934/* --------------------------------------------------------------------
935 * SystemACE device setup/teardown code
936 */
937static int __devinit ace_setup(struct ace_device *ace)
938{
939 u16 version;
940 u16 val;
Grant Likely74489a92007-07-17 04:03:39 -0700941 int rc;
942
Grant Likely4a24d862007-10-01 16:33:54 +0200943 dev_dbg(ace->dev, "ace_setup(ace=0x%p)\n", ace);
944 dev_dbg(ace->dev, "physaddr=0x%lx irq=%i\n", ace->physaddr, ace->irq);
945
Grant Likely74489a92007-07-17 04:03:39 -0700946 spin_lock_init(&ace->lock);
947 init_completion(&ace->id_completion);
948
949 /*
950 * Map the device
951 */
952 ace->baseaddr = ioremap(ace->physaddr, 0x80);
953 if (!ace->baseaddr)
954 goto err_ioremap;
955
Grant Likely74489a92007-07-17 04:03:39 -0700956 /*
957 * Initialize the state machine tasklet and stall timer
958 */
959 tasklet_init(&ace->fsm_tasklet, ace_fsm_tasklet, (unsigned long)ace);
960 setup_timer(&ace->stall_timer, ace_stall_timer, (unsigned long)ace);
961
962 /*
963 * Initialize the request queue
964 */
965 ace->queue = blk_init_queue(ace_request, &ace->lock);
966 if (ace->queue == NULL)
967 goto err_blk_initq;
968 blk_queue_hardsect_size(ace->queue, 512);
969
970 /*
971 * Allocate and initialize GD structure
972 */
973 ace->gd = alloc_disk(ACE_NUM_MINORS);
974 if (!ace->gd)
975 goto err_alloc_disk;
976
977 ace->gd->major = ace_major;
978 ace->gd->first_minor = ace->id * ACE_NUM_MINORS;
979 ace->gd->fops = &ace_fops;
980 ace->gd->queue = ace->queue;
981 ace->gd->private_data = ace;
982 snprintf(ace->gd->disk_name, 32, "xs%c", ace->id + 'a');
983
984 /* set bus width */
Grant Likely4a24d862007-10-01 16:33:54 +0200985 if (ace->bus_width == ACE_BUS_WIDTH_16) {
Grant Likely74489a92007-07-17 04:03:39 -0700986 /* 0x0101 should work regardless of endianess */
987 ace_out_le16(ace, ACE_BUSMODE, 0x0101);
988
989 /* read it back to determine endianess */
990 if (ace_in_le16(ace, ACE_BUSMODE) == 0x0001)
991 ace->reg_ops = &ace_reg_le16_ops;
992 else
993 ace->reg_ops = &ace_reg_be16_ops;
994 } else {
995 ace_out_8(ace, ACE_BUSMODE, 0x00);
996 ace->reg_ops = &ace_reg_8_ops;
997 }
998
999 /* Make sure version register is sane */
1000 version = ace_in(ace, ACE_VERSION);
1001 if ((version == 0) || (version == 0xFFFF))
1002 goto err_read;
1003
1004 /* Put sysace in a sane state by clearing most control reg bits */
1005 ace_out(ace, ACE_CTRL, ACE_CTRL_FORCECFGMODE |
1006 ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ);
1007
Grant Likely32f6fff2007-10-01 16:33:54 +02001008 /* Now we can hook up the irq handler */
1009 if (ace->irq != NO_IRQ) {
1010 rc = request_irq(ace->irq, ace_interrupt, 0, "systemace", ace);
1011 if (rc) {
1012 /* Failure - fall back to polled mode */
1013 dev_err(ace->dev, "request_irq failed\n");
1014 ace->irq = NO_IRQ;
1015 }
1016 }
1017
Grant Likelyd2bbf3d2007-10-04 08:52:40 +02001018 /* Enable interrupts */
1019 val = ace_in(ace, ACE_CTRL);
1020 val |= ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ;
1021 ace_out(ace, ACE_CTRL, val);
1022
Grant Likely74489a92007-07-17 04:03:39 -07001023 /* Print the identification */
1024 dev_info(ace->dev, "Xilinx SystemACE revision %i.%i.%i\n",
1025 (version >> 12) & 0xf, (version >> 8) & 0x0f, version & 0xff);
1026 dev_dbg(ace->dev, "physaddr 0x%lx, mapped to 0x%p, irq=%i\n",
1027 ace->physaddr, ace->baseaddr, ace->irq);
1028
1029 ace->media_change = 1;
1030 ace_revalidate_disk(ace->gd);
1031
1032 /* Make the sysace device 'live' */
1033 add_disk(ace->gd);
1034
1035 return 0;
1036
Grant Likelyed155a92007-10-01 16:33:56 +02001037err_read:
Grant Likely74489a92007-07-17 04:03:39 -07001038 put_disk(ace->gd);
Grant Likelyed155a92007-10-01 16:33:56 +02001039err_alloc_disk:
Grant Likely74489a92007-07-17 04:03:39 -07001040 blk_cleanup_queue(ace->queue);
Grant Likelyed155a92007-10-01 16:33:56 +02001041err_blk_initq:
Grant Likely74489a92007-07-17 04:03:39 -07001042 iounmap(ace->baseaddr);
Grant Likelyed155a92007-10-01 16:33:56 +02001043err_ioremap:
Grant Likely1b455462007-10-01 16:33:53 +02001044 dev_info(ace->dev, "xsysace: error initializing device at 0x%lx\n",
Grant Likely74489a92007-07-17 04:03:39 -07001045 ace->physaddr);
1046 return -ENOMEM;
1047}
1048
1049static void __devexit ace_teardown(struct ace_device *ace)
1050{
1051 if (ace->gd) {
1052 del_gendisk(ace->gd);
1053 put_disk(ace->gd);
1054 }
1055
1056 if (ace->queue)
1057 blk_cleanup_queue(ace->queue);
1058
1059 tasklet_kill(&ace->fsm_tasklet);
1060
1061 if (ace->irq != NO_IRQ)
1062 free_irq(ace->irq, ace);
1063
1064 iounmap(ace->baseaddr);
1065}
1066
Grant Likely1b455462007-10-01 16:33:53 +02001067static int __devinit
1068ace_alloc(struct device *dev, int id, unsigned long physaddr,
1069 int irq, int bus_width)
1070{
1071 struct ace_device *ace;
1072 int rc;
1073 dev_dbg(dev, "ace_alloc(%p)\n", dev);
1074
1075 if (!physaddr) {
1076 rc = -ENODEV;
1077 goto err_noreg;
1078 }
1079
1080 /* Allocate and initialize the ace device structure */
1081 ace = kzalloc(sizeof(struct ace_device), GFP_KERNEL);
1082 if (!ace) {
1083 rc = -ENOMEM;
1084 goto err_alloc;
1085 }
1086
1087 ace->dev = dev;
1088 ace->id = id;
1089 ace->physaddr = physaddr;
1090 ace->irq = irq;
1091 ace->bus_width = bus_width;
1092
1093 /* Call the setup code */
Grant Likely34e1b832007-10-04 08:52:38 +02001094 rc = ace_setup(ace);
1095 if (rc)
Grant Likely1b455462007-10-01 16:33:53 +02001096 goto err_setup;
1097
1098 dev_set_drvdata(dev, ace);
1099 return 0;
1100
Grant Likelyed155a92007-10-01 16:33:56 +02001101err_setup:
Grant Likely1b455462007-10-01 16:33:53 +02001102 dev_set_drvdata(dev, NULL);
1103 kfree(ace);
Grant Likelyed155a92007-10-01 16:33:56 +02001104err_alloc:
1105err_noreg:
Grant Likely1b455462007-10-01 16:33:53 +02001106 dev_err(dev, "could not initialize device, err=%i\n", rc);
1107 return rc;
1108}
1109
1110static void __devexit ace_free(struct device *dev)
1111{
1112 struct ace_device *ace = dev_get_drvdata(dev);
1113 dev_dbg(dev, "ace_free(%p)\n", dev);
1114
1115 if (ace) {
1116 ace_teardown(ace);
1117 dev_set_drvdata(dev, NULL);
1118 kfree(ace);
1119 }
1120}
1121
Grant Likely74489a92007-07-17 04:03:39 -07001122/* ---------------------------------------------------------------------
1123 * Platform Bus Support
1124 */
1125
Grant Likelyedec4962007-10-01 16:33:52 +02001126static int __devinit ace_probe(struct platform_device *dev)
Grant Likely74489a92007-07-17 04:03:39 -07001127{
Grant Likely1b455462007-10-01 16:33:53 +02001128 unsigned long physaddr = 0;
Grant Likely4a24d862007-10-01 16:33:54 +02001129 int bus_width = ACE_BUS_WIDTH_16; /* FIXME: should not be hard coded */
Grant Likely1b455462007-10-01 16:33:53 +02001130 int id = dev->id;
1131 int irq = NO_IRQ;
Grant Likely74489a92007-07-17 04:03:39 -07001132 int i;
1133
Grant Likelyedec4962007-10-01 16:33:52 +02001134 dev_dbg(&dev->dev, "ace_probe(%p)\n", dev);
Grant Likely74489a92007-07-17 04:03:39 -07001135
Grant Likely74489a92007-07-17 04:03:39 -07001136 for (i = 0; i < dev->num_resources; i++) {
1137 if (dev->resource[i].flags & IORESOURCE_MEM)
Grant Likely1b455462007-10-01 16:33:53 +02001138 physaddr = dev->resource[i].start;
Grant Likely74489a92007-07-17 04:03:39 -07001139 if (dev->resource[i].flags & IORESOURCE_IRQ)
Grant Likely1b455462007-10-01 16:33:53 +02001140 irq = dev->resource[i].start;
Grant Likely74489a92007-07-17 04:03:39 -07001141 }
1142
Grant Likely74489a92007-07-17 04:03:39 -07001143 /* Call the bus-independant setup code */
Grant Likely1b455462007-10-01 16:33:53 +02001144 return ace_alloc(&dev->dev, id, physaddr, irq, bus_width);
Grant Likely74489a92007-07-17 04:03:39 -07001145}
1146
1147/*
1148 * Platform bus remove() method
1149 */
Grant Likelyedec4962007-10-01 16:33:52 +02001150static int __devexit ace_remove(struct platform_device *dev)
Grant Likely74489a92007-07-17 04:03:39 -07001151{
Grant Likely1b455462007-10-01 16:33:53 +02001152 ace_free(&dev->dev);
Grant Likely74489a92007-07-17 04:03:39 -07001153 return 0;
1154}
1155
Grant Likelyedec4962007-10-01 16:33:52 +02001156static struct platform_driver ace_platform_driver = {
Grant Likely74489a92007-07-17 04:03:39 -07001157 .probe = ace_probe,
1158 .remove = __devexit_p(ace_remove),
Grant Likelyedec4962007-10-01 16:33:52 +02001159 .driver = {
1160 .owner = THIS_MODULE,
1161 .name = "xsysace",
1162 },
Grant Likely74489a92007-07-17 04:03:39 -07001163};
1164
1165/* ---------------------------------------------------------------------
Grant Likely95e896c2007-10-01 16:33:55 +02001166 * OF_Platform Bus Support
1167 */
1168
1169#if defined(CONFIG_OF)
1170static int __devinit
1171ace_of_probe(struct of_device *op, const struct of_device_id *match)
1172{
1173 struct resource res;
1174 unsigned long physaddr;
1175 const u32 *id;
1176 int irq, bus_width, rc;
1177
1178 dev_dbg(&op->dev, "ace_of_probe(%p, %p)\n", op, match);
1179
1180 /* device id */
1181 id = of_get_property(op->node, "port-number", NULL);
1182
1183 /* physaddr */
1184 rc = of_address_to_resource(op->node, 0, &res);
1185 if (rc) {
1186 dev_err(&op->dev, "invalid address\n");
1187 return rc;
1188 }
1189 physaddr = res.start;
1190
1191 /* irq */
1192 irq = irq_of_parse_and_map(op->node, 0);
1193
1194 /* bus width */
1195 bus_width = ACE_BUS_WIDTH_16;
1196 if (of_find_property(op->node, "8-bit", NULL))
1197 bus_width = ACE_BUS_WIDTH_8;
1198
1199 /* Call the bus-independant setup code */
1200 return ace_alloc(&op->dev, id ? *id : 0, physaddr, irq, bus_width);
1201}
1202
1203static int __devexit ace_of_remove(struct of_device *op)
1204{
1205 ace_free(&op->dev);
1206 return 0;
1207}
1208
1209/* Match table for of_platform binding */
1210static struct of_device_id __devinit ace_of_match[] = {
1211 { .compatible = "xilinx,xsysace", },
1212 {},
1213};
1214MODULE_DEVICE_TABLE(of, ace_of_match);
1215
1216static struct of_platform_driver ace_of_driver = {
1217 .owner = THIS_MODULE,
1218 .name = "xsysace",
1219 .match_table = ace_of_match,
1220 .probe = ace_of_probe,
1221 .remove = __devexit_p(ace_of_remove),
1222 .driver = {
1223 .name = "xsysace",
1224 },
1225};
1226
1227/* Registration helpers to keep the number of #ifdefs to a minimum */
1228static inline int __init ace_of_register(void)
1229{
1230 pr_debug("xsysace: registering OF binding\n");
1231 return of_register_platform_driver(&ace_of_driver);
1232}
1233
1234static inline void __exit ace_of_unregister(void)
1235{
1236 of_unregister_platform_driver(&ace_of_driver);
1237}
1238#else /* CONFIG_OF */
1239/* CONFIG_OF not enabled; do nothing helpers */
1240static inline int __init ace_of_register(void) { return 0; }
1241static inline void __exit ace_of_unregister(void) { }
1242#endif /* CONFIG_OF */
1243
1244/* ---------------------------------------------------------------------
Grant Likely74489a92007-07-17 04:03:39 -07001245 * Module init/exit routines
1246 */
1247static int __init ace_init(void)
1248{
Grant Likelyedec4962007-10-01 16:33:52 +02001249 int rc;
1250
Grant Likely74489a92007-07-17 04:03:39 -07001251 ace_major = register_blkdev(ace_major, "xsysace");
1252 if (ace_major <= 0) {
Grant Likelyedec4962007-10-01 16:33:52 +02001253 rc = -ENOMEM;
1254 goto err_blk;
Grant Likely74489a92007-07-17 04:03:39 -07001255 }
1256
Grant Likely34e1b832007-10-04 08:52:38 +02001257 rc = ace_of_register();
1258 if (rc)
Grant Likely95e896c2007-10-01 16:33:55 +02001259 goto err_of;
1260
Grant Likely4a24d862007-10-01 16:33:54 +02001261 pr_debug("xsysace: registering platform binding\n");
Grant Likely34e1b832007-10-04 08:52:38 +02001262 rc = platform_driver_register(&ace_platform_driver);
1263 if (rc)
Grant Likelyedec4962007-10-01 16:33:52 +02001264 goto err_plat;
1265
1266 pr_info("Xilinx SystemACE device driver, major=%i\n", ace_major);
1267 return 0;
1268
Grant Likelyed155a92007-10-01 16:33:56 +02001269err_plat:
Grant Likely95e896c2007-10-01 16:33:55 +02001270 ace_of_unregister();
Grant Likelyed155a92007-10-01 16:33:56 +02001271err_of:
Grant Likelyedec4962007-10-01 16:33:52 +02001272 unregister_blkdev(ace_major, "xsysace");
Grant Likelyed155a92007-10-01 16:33:56 +02001273err_blk:
Grant Likelyedec4962007-10-01 16:33:52 +02001274 printk(KERN_ERR "xsysace: registration failed; err=%i\n", rc);
1275 return rc;
Grant Likely74489a92007-07-17 04:03:39 -07001276}
1277
1278static void __exit ace_exit(void)
1279{
1280 pr_debug("Unregistering Xilinx SystemACE driver\n");
Grant Likelyedec4962007-10-01 16:33:52 +02001281 platform_driver_unregister(&ace_platform_driver);
Grant Likely95e896c2007-10-01 16:33:55 +02001282 ace_of_unregister();
Akinobu Mitac6d4d632007-07-17 04:03:46 -07001283 unregister_blkdev(ace_major, "xsysace");
Grant Likely74489a92007-07-17 04:03:39 -07001284}
1285
1286module_init(ace_init);
1287module_exit(ace_exit);