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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>
Bartlomiej Zolnierkiewicz4aaf2fe2009-04-01 21:42:22 +020092#include <linux/ata.h>
Grant Likely74489a92007-07-17 04:03:39 -070093#include <linux/hdreg.h>
94#include <linux/platform_device.h>
Grant Likely95e896c2007-10-01 16:33:55 +020095#if defined(CONFIG_OF)
96#include <linux/of_device.h>
97#include <linux/of_platform.h>
98#endif
Grant Likely74489a92007-07-17 04:03:39 -070099
100MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
101MODULE_DESCRIPTION("Xilinx SystemACE device driver");
102MODULE_LICENSE("GPL");
103
104/* SystemACE register definitions */
105#define ACE_BUSMODE (0x00)
106
107#define ACE_STATUS (0x04)
108#define ACE_STATUS_CFGLOCK (0x00000001)
109#define ACE_STATUS_MPULOCK (0x00000002)
110#define ACE_STATUS_CFGERROR (0x00000004) /* config controller error */
111#define ACE_STATUS_CFCERROR (0x00000008) /* CF controller error */
112#define ACE_STATUS_CFDETECT (0x00000010)
113#define ACE_STATUS_DATABUFRDY (0x00000020)
114#define ACE_STATUS_DATABUFMODE (0x00000040)
115#define ACE_STATUS_CFGDONE (0x00000080)
116#define ACE_STATUS_RDYFORCFCMD (0x00000100)
117#define ACE_STATUS_CFGMODEPIN (0x00000200)
118#define ACE_STATUS_CFGADDR_MASK (0x0000e000)
119#define ACE_STATUS_CFBSY (0x00020000)
120#define ACE_STATUS_CFRDY (0x00040000)
121#define ACE_STATUS_CFDWF (0x00080000)
122#define ACE_STATUS_CFDSC (0x00100000)
123#define ACE_STATUS_CFDRQ (0x00200000)
124#define ACE_STATUS_CFCORR (0x00400000)
125#define ACE_STATUS_CFERR (0x00800000)
126
127#define ACE_ERROR (0x08)
128#define ACE_CFGLBA (0x0c)
129#define ACE_MPULBA (0x10)
130
131#define ACE_SECCNTCMD (0x14)
132#define ACE_SECCNTCMD_RESET (0x0100)
133#define ACE_SECCNTCMD_IDENTIFY (0x0200)
134#define ACE_SECCNTCMD_READ_DATA (0x0300)
135#define ACE_SECCNTCMD_WRITE_DATA (0x0400)
136#define ACE_SECCNTCMD_ABORT (0x0600)
137
138#define ACE_VERSION (0x16)
139#define ACE_VERSION_REVISION_MASK (0x00FF)
140#define ACE_VERSION_MINOR_MASK (0x0F00)
141#define ACE_VERSION_MAJOR_MASK (0xF000)
142
143#define ACE_CTRL (0x18)
144#define ACE_CTRL_FORCELOCKREQ (0x0001)
145#define ACE_CTRL_LOCKREQ (0x0002)
146#define ACE_CTRL_FORCECFGADDR (0x0004)
147#define ACE_CTRL_FORCECFGMODE (0x0008)
148#define ACE_CTRL_CFGMODE (0x0010)
149#define ACE_CTRL_CFGSTART (0x0020)
150#define ACE_CTRL_CFGSEL (0x0040)
151#define ACE_CTRL_CFGRESET (0x0080)
152#define ACE_CTRL_DATABUFRDYIRQ (0x0100)
153#define ACE_CTRL_ERRORIRQ (0x0200)
154#define ACE_CTRL_CFGDONEIRQ (0x0400)
155#define ACE_CTRL_RESETIRQ (0x0800)
156#define ACE_CTRL_CFGPROG (0x1000)
157#define ACE_CTRL_CFGADDR_MASK (0xe000)
158
159#define ACE_FATSTAT (0x1c)
160
161#define ACE_NUM_MINORS 16
162#define ACE_SECTOR_SIZE (512)
163#define ACE_FIFO_SIZE (32)
164#define ACE_BUF_PER_SECTOR (ACE_SECTOR_SIZE / ACE_FIFO_SIZE)
165
Grant Likely4a24d862007-10-01 16:33:54 +0200166#define ACE_BUS_WIDTH_8 0
167#define ACE_BUS_WIDTH_16 1
168
Grant Likely74489a92007-07-17 04:03:39 -0700169struct ace_reg_ops;
170
171struct ace_device {
172 /* driver state data */
173 int id;
174 int media_change;
175 int users;
176 struct list_head list;
177
178 /* finite state machine data */
179 struct tasklet_struct fsm_tasklet;
180 uint fsm_task; /* Current activity (ACE_TASK_*) */
181 uint fsm_state; /* Current state (ACE_FSM_STATE_*) */
182 uint fsm_continue_flag; /* cleared to exit FSM mainloop */
183 uint fsm_iter_num;
184 struct timer_list stall_timer;
185
186 /* Transfer state/result, use for both id and block request */
187 struct request *req; /* request being processed */
188 void *data_ptr; /* pointer to I/O buffer */
189 int data_count; /* number of buffers remaining */
190 int data_result; /* Result of transfer; 0 := success */
191
192 int id_req_count; /* count of id requests */
193 int id_result;
194 struct completion id_completion; /* used when id req finishes */
195 int in_irq;
196
197 /* Details of hardware device */
Yuri Tikhonovc14464b2008-11-14 10:21:57 -0700198 resource_size_t physaddr;
Grant Likelyb5515d82007-10-04 08:52:39 +0200199 void __iomem *baseaddr;
Grant Likely74489a92007-07-17 04:03:39 -0700200 int irq;
201 int bus_width; /* 0 := 8 bit; 1 := 16 bit */
202 struct ace_reg_ops *reg_ops;
203 int lock_count;
204
205 /* Block device data structures */
206 spinlock_t lock;
207 struct device *dev;
208 struct request_queue *queue;
209 struct gendisk *gd;
210
211 /* Inserted CF card parameters */
Bartlomiej Zolnierkiewicz4aaf2fe2009-04-01 21:42:22 +0200212 u16 cf_id[ATA_ID_WORDS];
Grant Likely74489a92007-07-17 04:03:39 -0700213};
214
215static int ace_major;
216
217/* ---------------------------------------------------------------------
218 * Low level register access
219 */
220
221struct ace_reg_ops {
222 u16(*in) (struct ace_device * ace, int reg);
223 void (*out) (struct ace_device * ace, int reg, u16 val);
224 void (*datain) (struct ace_device * ace);
225 void (*dataout) (struct ace_device * ace);
226};
227
228/* 8 Bit bus width */
229static u16 ace_in_8(struct ace_device *ace, int reg)
230{
Grant Likelyb5515d82007-10-04 08:52:39 +0200231 void __iomem *r = ace->baseaddr + reg;
Grant Likely74489a92007-07-17 04:03:39 -0700232 return in_8(r) | (in_8(r + 1) << 8);
233}
234
235static void ace_out_8(struct ace_device *ace, int reg, u16 val)
236{
Grant Likelyb5515d82007-10-04 08:52:39 +0200237 void __iomem *r = ace->baseaddr + reg;
Grant Likely74489a92007-07-17 04:03:39 -0700238 out_8(r, val);
239 out_8(r + 1, val >> 8);
240}
241
242static void ace_datain_8(struct ace_device *ace)
243{
Grant Likelyb5515d82007-10-04 08:52:39 +0200244 void __iomem *r = ace->baseaddr + 0x40;
Grant Likely74489a92007-07-17 04:03:39 -0700245 u8 *dst = ace->data_ptr;
246 int i = ACE_FIFO_SIZE;
247 while (i--)
248 *dst++ = in_8(r++);
249 ace->data_ptr = dst;
250}
251
252static void ace_dataout_8(struct ace_device *ace)
253{
Grant Likelyb5515d82007-10-04 08:52:39 +0200254 void __iomem *r = ace->baseaddr + 0x40;
Grant Likely74489a92007-07-17 04:03:39 -0700255 u8 *src = ace->data_ptr;
256 int i = ACE_FIFO_SIZE;
257 while (i--)
258 out_8(r++, *src++);
259 ace->data_ptr = src;
260}
261
262static struct ace_reg_ops ace_reg_8_ops = {
263 .in = ace_in_8,
264 .out = ace_out_8,
265 .datain = ace_datain_8,
266 .dataout = ace_dataout_8,
267};
268
269/* 16 bit big endian bus attachment */
270static u16 ace_in_be16(struct ace_device *ace, int reg)
271{
272 return in_be16(ace->baseaddr + reg);
273}
274
275static void ace_out_be16(struct ace_device *ace, int reg, u16 val)
276{
277 out_be16(ace->baseaddr + reg, val);
278}
279
280static void ace_datain_be16(struct ace_device *ace)
281{
282 int i = ACE_FIFO_SIZE / 2;
283 u16 *dst = ace->data_ptr;
284 while (i--)
285 *dst++ = in_le16(ace->baseaddr + 0x40);
286 ace->data_ptr = dst;
287}
288
289static void ace_dataout_be16(struct ace_device *ace)
290{
291 int i = ACE_FIFO_SIZE / 2;
292 u16 *src = ace->data_ptr;
293 while (i--)
294 out_le16(ace->baseaddr + 0x40, *src++);
295 ace->data_ptr = src;
296}
297
298/* 16 bit little endian bus attachment */
299static u16 ace_in_le16(struct ace_device *ace, int reg)
300{
301 return in_le16(ace->baseaddr + reg);
302}
303
304static void ace_out_le16(struct ace_device *ace, int reg, u16 val)
305{
306 out_le16(ace->baseaddr + reg, val);
307}
308
309static void ace_datain_le16(struct ace_device *ace)
310{
311 int i = ACE_FIFO_SIZE / 2;
312 u16 *dst = ace->data_ptr;
313 while (i--)
314 *dst++ = in_be16(ace->baseaddr + 0x40);
315 ace->data_ptr = dst;
316}
317
318static void ace_dataout_le16(struct ace_device *ace)
319{
320 int i = ACE_FIFO_SIZE / 2;
321 u16 *src = ace->data_ptr;
322 while (i--)
323 out_be16(ace->baseaddr + 0x40, *src++);
324 ace->data_ptr = src;
325}
326
327static struct ace_reg_ops ace_reg_be16_ops = {
328 .in = ace_in_be16,
329 .out = ace_out_be16,
330 .datain = ace_datain_be16,
331 .dataout = ace_dataout_be16,
332};
333
334static struct ace_reg_ops ace_reg_le16_ops = {
335 .in = ace_in_le16,
336 .out = ace_out_le16,
337 .datain = ace_datain_le16,
338 .dataout = ace_dataout_le16,
339};
340
341static inline u16 ace_in(struct ace_device *ace, int reg)
342{
343 return ace->reg_ops->in(ace, reg);
344}
345
346static inline u32 ace_in32(struct ace_device *ace, int reg)
347{
348 return ace_in(ace, reg) | (ace_in(ace, reg + 2) << 16);
349}
350
351static inline void ace_out(struct ace_device *ace, int reg, u16 val)
352{
353 ace->reg_ops->out(ace, reg, val);
354}
355
356static inline void ace_out32(struct ace_device *ace, int reg, u32 val)
357{
358 ace_out(ace, reg, val);
359 ace_out(ace, reg + 2, val >> 16);
360}
361
362/* ---------------------------------------------------------------------
363 * Debug support functions
364 */
365
366#if defined(DEBUG)
367static void ace_dump_mem(void *base, int len)
368{
369 const char *ptr = base;
370 int i, j;
371
372 for (i = 0; i < len; i += 16) {
373 printk(KERN_INFO "%.8x:", i);
374 for (j = 0; j < 16; j++) {
375 if (!(j % 4))
376 printk(" ");
377 printk("%.2x", ptr[i + j]);
378 }
379 printk(" ");
380 for (j = 0; j < 16; j++)
381 printk("%c", isprint(ptr[i + j]) ? ptr[i + j] : '.');
382 printk("\n");
383 }
384}
385#else
386static inline void ace_dump_mem(void *base, int len)
387{
388}
389#endif
390
391static void ace_dump_regs(struct ace_device *ace)
392{
393 dev_info(ace->dev, " ctrl: %.8x seccnt/cmd: %.4x ver:%.4x\n"
Joe Perches898eb712007-10-18 03:06:30 -0700394 KERN_INFO " status:%.8x mpu_lba:%.8x busmode:%4x\n"
395 KERN_INFO " error: %.8x cfg_lba:%.8x fatstat:%.4x\n",
Grant Likely74489a92007-07-17 04:03:39 -0700396 ace_in32(ace, ACE_CTRL),
397 ace_in(ace, ACE_SECCNTCMD),
398 ace_in(ace, ACE_VERSION),
399 ace_in32(ace, ACE_STATUS),
400 ace_in32(ace, ACE_MPULBA),
401 ace_in(ace, ACE_BUSMODE),
402 ace_in32(ace, ACE_ERROR),
403 ace_in32(ace, ACE_CFGLBA), ace_in(ace, ACE_FATSTAT));
404}
405
Bartlomiej Zolnierkiewicz4aaf2fe2009-04-01 21:42:22 +0200406void ace_fix_driveid(u16 *id)
Grant Likely74489a92007-07-17 04:03:39 -0700407{
408#if defined(__BIG_ENDIAN)
Grant Likely74489a92007-07-17 04:03:39 -0700409 int i;
410
411 /* All half words have wrong byte order; swap the bytes */
Bartlomiej Zolnierkiewicz4aaf2fe2009-04-01 21:42:22 +0200412 for (i = 0; i < ATA_ID_WORDS; i++, id++)
413 *id = le16_to_cpu(*id);
Grant Likely74489a92007-07-17 04:03:39 -0700414#endif
415}
416
417/* ---------------------------------------------------------------------
418 * Finite State Machine (FSM) implementation
419 */
420
421/* FSM tasks; used to direct state transitions */
422#define ACE_TASK_IDLE 0
423#define ACE_TASK_IDENTIFY 1
424#define ACE_TASK_READ 2
425#define ACE_TASK_WRITE 3
426#define ACE_FSM_NUM_TASKS 4
427
428/* FSM state definitions */
429#define ACE_FSM_STATE_IDLE 0
430#define ACE_FSM_STATE_REQ_LOCK 1
431#define ACE_FSM_STATE_WAIT_LOCK 2
432#define ACE_FSM_STATE_WAIT_CFREADY 3
433#define ACE_FSM_STATE_IDENTIFY_PREPARE 4
434#define ACE_FSM_STATE_IDENTIFY_TRANSFER 5
435#define ACE_FSM_STATE_IDENTIFY_COMPLETE 6
436#define ACE_FSM_STATE_REQ_PREPARE 7
437#define ACE_FSM_STATE_REQ_TRANSFER 8
438#define ACE_FSM_STATE_REQ_COMPLETE 9
439#define ACE_FSM_STATE_ERROR 10
440#define ACE_FSM_NUM_STATES 11
441
442/* Set flag to exit FSM loop and reschedule tasklet */
443static inline void ace_fsm_yield(struct ace_device *ace)
444{
445 dev_dbg(ace->dev, "ace_fsm_yield()\n");
446 tasklet_schedule(&ace->fsm_tasklet);
447 ace->fsm_continue_flag = 0;
448}
449
450/* Set flag to exit FSM loop and wait for IRQ to reschedule tasklet */
451static inline void ace_fsm_yieldirq(struct ace_device *ace)
452{
453 dev_dbg(ace->dev, "ace_fsm_yieldirq()\n");
454
455 if (ace->irq == NO_IRQ)
456 /* No IRQ assigned, so need to poll */
457 tasklet_schedule(&ace->fsm_tasklet);
458 ace->fsm_continue_flag = 0;
459}
460
461/* Get the next read/write request; ending requests that we don't handle */
Jens Axboe165125e2007-07-24 09:28:11 +0200462struct request *ace_get_next_request(struct request_queue * q)
Grant Likely74489a92007-07-17 04:03:39 -0700463{
464 struct request *req;
465
Tejun Heo9934c8c2009-05-08 11:54:16 +0900466 while ((req = blk_peek_request(q)) != NULL) {
Grant Likely74489a92007-07-17 04:03:39 -0700467 if (blk_fs_request(req))
468 break;
Tejun Heo9934c8c2009-05-08 11:54:16 +0900469 blk_start_request(req);
Tejun Heo2d75ce02009-05-08 11:54:05 +0900470 __blk_end_request_all(req, -EIO);
Grant Likely74489a92007-07-17 04:03:39 -0700471 }
472 return req;
473}
474
475static void ace_fsm_dostate(struct ace_device *ace)
476{
477 struct request *req;
478 u32 status;
479 u16 val;
480 int count;
Grant Likely74489a92007-07-17 04:03:39 -0700481
482#if defined(DEBUG)
483 dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
484 ace->fsm_state, ace->id_req_count);
485#endif
486
Grant Likelybfbd4422009-03-09 13:42:24 +0100487 /* Verify that there is actually a CF in the slot. If not, then
488 * bail out back to the idle state and wake up all the waiters */
489 status = ace_in32(ace, ACE_STATUS);
490 if ((status & ACE_STATUS_CFDETECT) == 0) {
491 ace->fsm_state = ACE_FSM_STATE_IDLE;
492 ace->media_change = 1;
493 set_capacity(ace->gd, 0);
494 dev_info(ace->dev, "No CF in slot\n");
495
Tejun Heo2d75ce02009-05-08 11:54:05 +0900496 /* Drop all in-flight and pending requests */
497 if (ace->req) {
498 __blk_end_request_all(ace->req, -EIO);
499 ace->req = NULL;
500 }
Tejun Heo9934c8c2009-05-08 11:54:16 +0900501 while ((req = blk_fetch_request(ace->queue)) != NULL)
Tejun Heo2d75ce02009-05-08 11:54:05 +0900502 __blk_end_request_all(req, -EIO);
Grant Likelybfbd4422009-03-09 13:42:24 +0100503
504 /* Drop back to IDLE state and notify waiters */
505 ace->fsm_state = ACE_FSM_STATE_IDLE;
506 ace->id_result = -EIO;
507 while (ace->id_req_count) {
508 complete(&ace->id_completion);
509 ace->id_req_count--;
510 }
511 }
512
Grant Likely74489a92007-07-17 04:03:39 -0700513 switch (ace->fsm_state) {
514 case ACE_FSM_STATE_IDLE:
515 /* See if there is anything to do */
516 if (ace->id_req_count || ace_get_next_request(ace->queue)) {
517 ace->fsm_iter_num++;
518 ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
519 mod_timer(&ace->stall_timer, jiffies + HZ);
520 if (!timer_pending(&ace->stall_timer))
521 add_timer(&ace->stall_timer);
522 break;
523 }
524 del_timer(&ace->stall_timer);
525 ace->fsm_continue_flag = 0;
526 break;
527
528 case ACE_FSM_STATE_REQ_LOCK:
529 if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
530 /* Already have the lock, jump to next state */
531 ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
532 break;
533 }
534
535 /* Request the lock */
536 val = ace_in(ace, ACE_CTRL);
537 ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
538 ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
539 break;
540
541 case ACE_FSM_STATE_WAIT_LOCK:
542 if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
543 /* got the lock; move to next state */
544 ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
545 break;
546 }
547
548 /* wait a bit for the lock */
549 ace_fsm_yield(ace);
550 break;
551
552 case ACE_FSM_STATE_WAIT_CFREADY:
553 status = ace_in32(ace, ACE_STATUS);
554 if (!(status & ACE_STATUS_RDYFORCFCMD) ||
555 (status & ACE_STATUS_CFBSY)) {
556 /* CF card isn't ready; it needs to be polled */
557 ace_fsm_yield(ace);
558 break;
559 }
560
561 /* Device is ready for command; determine what to do next */
562 if (ace->id_req_count)
563 ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
564 else
565 ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
566 break;
567
568 case ACE_FSM_STATE_IDENTIFY_PREPARE:
569 /* Send identify command */
570 ace->fsm_task = ACE_TASK_IDENTIFY;
Grant Likelyf0edef82009-04-08 14:13:04 +0200571 ace->data_ptr = ace->cf_id;
Grant Likely74489a92007-07-17 04:03:39 -0700572 ace->data_count = ACE_BUF_PER_SECTOR;
573 ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);
574
575 /* As per datasheet, put config controller in reset */
576 val = ace_in(ace, ACE_CTRL);
577 ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
578
579 /* irq handler takes over from this point; wait for the
580 * transfer to complete */
581 ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
582 ace_fsm_yieldirq(ace);
583 break;
584
585 case ACE_FSM_STATE_IDENTIFY_TRANSFER:
586 /* Check that the sysace is ready to receive data */
587 status = ace_in32(ace, ACE_STATUS);
588 if (status & ACE_STATUS_CFBSY) {
589 dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
590 ace->fsm_task, ace->fsm_iter_num,
591 ace->data_count);
592 ace_fsm_yield(ace);
593 break;
594 }
595 if (!(status & ACE_STATUS_DATABUFRDY)) {
596 ace_fsm_yield(ace);
597 break;
598 }
599
600 /* Transfer the next buffer */
601 ace->reg_ops->datain(ace);
602 ace->data_count--;
603
604 /* If there are still buffers to be transfers; jump out here */
605 if (ace->data_count != 0) {
606 ace_fsm_yieldirq(ace);
607 break;
608 }
609
610 /* transfer finished; kick state machine */
611 dev_dbg(ace->dev, "identify finished\n");
612 ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
613 break;
614
615 case ACE_FSM_STATE_IDENTIFY_COMPLETE:
Grant Likelyf0edef82009-04-08 14:13:04 +0200616 ace_fix_driveid(ace->cf_id);
617 ace_dump_mem(ace->cf_id, 512); /* Debug: Dump out disk ID */
Grant Likely74489a92007-07-17 04:03:39 -0700618
619 if (ace->data_result) {
620 /* Error occured, disable the disk */
621 ace->media_change = 1;
622 set_capacity(ace->gd, 0);
623 dev_err(ace->dev, "error fetching CF id (%i)\n",
624 ace->data_result);
625 } else {
626 ace->media_change = 0;
627
628 /* Record disk parameters */
Bartlomiej Zolnierkiewicz4aaf2fe2009-04-01 21:42:22 +0200629 set_capacity(ace->gd,
Grant Likelyf0edef82009-04-08 14:13:04 +0200630 ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
Grant Likely74489a92007-07-17 04:03:39 -0700631 dev_info(ace->dev, "capacity: %i sectors\n",
Grant Likelyf0edef82009-04-08 14:13:04 +0200632 ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
Grant Likely74489a92007-07-17 04:03:39 -0700633 }
634
635 /* We're done, drop to IDLE state and notify waiters */
636 ace->fsm_state = ACE_FSM_STATE_IDLE;
637 ace->id_result = ace->data_result;
638 while (ace->id_req_count) {
639 complete(&ace->id_completion);
640 ace->id_req_count--;
641 }
642 break;
643
644 case ACE_FSM_STATE_REQ_PREPARE:
645 req = ace_get_next_request(ace->queue);
646 if (!req) {
647 ace->fsm_state = ACE_FSM_STATE_IDLE;
648 break;
649 }
Tejun Heo9934c8c2009-05-08 11:54:16 +0900650 blk_start_request(req);
Grant Likely74489a92007-07-17 04:03:39 -0700651
652 /* Okay, it's a data request, set it up for transfer */
653 dev_dbg(ace->dev,
Tejun Heo5b936292009-05-07 22:24:38 +0900654 "request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
Tejun Heo83096eb2009-05-07 22:24:39 +0900655 (unsigned long long)blk_rq_pos(req),
656 blk_rq_sectors(req), blk_rq_cur_sectors(req),
657 rq_data_dir(req));
Grant Likely74489a92007-07-17 04:03:39 -0700658
659 ace->req = req;
660 ace->data_ptr = req->buffer;
Tejun Heo83096eb2009-05-07 22:24:39 +0900661 ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
662 ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);
Grant Likely74489a92007-07-17 04:03:39 -0700663
Tejun Heo5b936292009-05-07 22:24:38 +0900664 count = blk_rq_sectors(req);
Grant Likely74489a92007-07-17 04:03:39 -0700665 if (rq_data_dir(req)) {
666 /* Kick off write request */
667 dev_dbg(ace->dev, "write data\n");
668 ace->fsm_task = ACE_TASK_WRITE;
669 ace_out(ace, ACE_SECCNTCMD,
670 count | ACE_SECCNTCMD_WRITE_DATA);
671 } else {
672 /* Kick off read request */
673 dev_dbg(ace->dev, "read data\n");
674 ace->fsm_task = ACE_TASK_READ;
675 ace_out(ace, ACE_SECCNTCMD,
676 count | ACE_SECCNTCMD_READ_DATA);
677 }
678
679 /* As per datasheet, put config controller in reset */
680 val = ace_in(ace, ACE_CTRL);
681 ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
682
683 /* Move to the transfer state. The systemace will raise
684 * an interrupt once there is something to do
685 */
686 ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
687 if (ace->fsm_task == ACE_TASK_READ)
688 ace_fsm_yieldirq(ace); /* wait for data ready */
689 break;
690
691 case ACE_FSM_STATE_REQ_TRANSFER:
692 /* Check that the sysace is ready to receive data */
693 status = ace_in32(ace, ACE_STATUS);
694 if (status & ACE_STATUS_CFBSY) {
695 dev_dbg(ace->dev,
696 "CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
697 ace->fsm_task, ace->fsm_iter_num,
Tejun Heo83096eb2009-05-07 22:24:39 +0900698 blk_rq_cur_sectors(ace->req) * 16,
Grant Likely74489a92007-07-17 04:03:39 -0700699 ace->data_count, ace->in_irq);
700 ace_fsm_yield(ace); /* need to poll CFBSY bit */
701 break;
702 }
703 if (!(status & ACE_STATUS_DATABUFRDY)) {
704 dev_dbg(ace->dev,
705 "DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
706 ace->fsm_task, ace->fsm_iter_num,
Tejun Heo83096eb2009-05-07 22:24:39 +0900707 blk_rq_cur_sectors(ace->req) * 16,
Grant Likely74489a92007-07-17 04:03:39 -0700708 ace->data_count, ace->in_irq);
709 ace_fsm_yieldirq(ace);
710 break;
711 }
712
713 /* Transfer the next buffer */
Grant Likely74489a92007-07-17 04:03:39 -0700714 if (ace->fsm_task == ACE_TASK_WRITE)
715 ace->reg_ops->dataout(ace);
716 else
717 ace->reg_ops->datain(ace);
718 ace->data_count--;
719
720 /* If there are still buffers to be transfers; jump out here */
721 if (ace->data_count != 0) {
722 ace_fsm_yieldirq(ace);
723 break;
724 }
725
726 /* bio finished; is there another one? */
Tejun Heo2d75ce02009-05-08 11:54:05 +0900727 if (__blk_end_request_cur(ace->req, 0)) {
Tejun Heo5b936292009-05-07 22:24:38 +0900728 /* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
729 * blk_rq_sectors(ace->req),
Tejun Heo83096eb2009-05-07 22:24:39 +0900730 * blk_rq_cur_sectors(ace->req));
Grant Likely74489a92007-07-17 04:03:39 -0700731 */
732 ace->data_ptr = ace->req->buffer;
Tejun Heo83096eb2009-05-07 22:24:39 +0900733 ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
Grant Likely74489a92007-07-17 04:03:39 -0700734 ace_fsm_yieldirq(ace);
735 break;
736 }
737
738 ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
739 break;
740
741 case ACE_FSM_STATE_REQ_COMPLETE:
Grant Likely74489a92007-07-17 04:03:39 -0700742 ace->req = NULL;
743
744 /* Finished request; go to idle state */
745 ace->fsm_state = ACE_FSM_STATE_IDLE;
746 break;
747
748 default:
749 ace->fsm_state = ACE_FSM_STATE_IDLE;
750 break;
751 }
752}
753
754static void ace_fsm_tasklet(unsigned long data)
755{
756 struct ace_device *ace = (void *)data;
757 unsigned long flags;
758
759 spin_lock_irqsave(&ace->lock, flags);
760
761 /* Loop over state machine until told to stop */
762 ace->fsm_continue_flag = 1;
763 while (ace->fsm_continue_flag)
764 ace_fsm_dostate(ace);
765
766 spin_unlock_irqrestore(&ace->lock, flags);
767}
768
769static void ace_stall_timer(unsigned long data)
770{
771 struct ace_device *ace = (void *)data;
772 unsigned long flags;
773
774 dev_warn(ace->dev,
775 "kicking stalled fsm; state=%i task=%i iter=%i dc=%i\n",
776 ace->fsm_state, ace->fsm_task, ace->fsm_iter_num,
777 ace->data_count);
778 spin_lock_irqsave(&ace->lock, flags);
779
780 /* Rearm the stall timer *before* entering FSM (which may then
781 * delete the timer) */
782 mod_timer(&ace->stall_timer, jiffies + HZ);
783
784 /* Loop over state machine until told to stop */
785 ace->fsm_continue_flag = 1;
786 while (ace->fsm_continue_flag)
787 ace_fsm_dostate(ace);
788
789 spin_unlock_irqrestore(&ace->lock, flags);
790}
791
792/* ---------------------------------------------------------------------
793 * Interrupt handling routines
794 */
795static int ace_interrupt_checkstate(struct ace_device *ace)
796{
797 u32 sreg = ace_in32(ace, ACE_STATUS);
798 u16 creg = ace_in(ace, ACE_CTRL);
799
800 /* Check for error occurance */
801 if ((sreg & (ACE_STATUS_CFGERROR | ACE_STATUS_CFCERROR)) &&
802 (creg & ACE_CTRL_ERRORIRQ)) {
803 dev_err(ace->dev, "transfer failure\n");
804 ace_dump_regs(ace);
805 return -EIO;
806 }
807
808 return 0;
809}
810
811static irqreturn_t ace_interrupt(int irq, void *dev_id)
812{
813 u16 creg;
814 struct ace_device *ace = dev_id;
815
816 /* be safe and get the lock */
817 spin_lock(&ace->lock);
818 ace->in_irq = 1;
819
820 /* clear the interrupt */
821 creg = ace_in(ace, ACE_CTRL);
822 ace_out(ace, ACE_CTRL, creg | ACE_CTRL_RESETIRQ);
823 ace_out(ace, ACE_CTRL, creg);
824
825 /* check for IO failures */
826 if (ace_interrupt_checkstate(ace))
827 ace->data_result = -EIO;
828
829 if (ace->fsm_task == 0) {
830 dev_err(ace->dev,
831 "spurious irq; stat=%.8x ctrl=%.8x cmd=%.4x\n",
832 ace_in32(ace, ACE_STATUS), ace_in32(ace, ACE_CTRL),
833 ace_in(ace, ACE_SECCNTCMD));
834 dev_err(ace->dev, "fsm_task=%i fsm_state=%i data_count=%i\n",
835 ace->fsm_task, ace->fsm_state, ace->data_count);
836 }
837
838 /* Loop over state machine until told to stop */
839 ace->fsm_continue_flag = 1;
840 while (ace->fsm_continue_flag)
841 ace_fsm_dostate(ace);
842
843 /* done with interrupt; drop the lock */
844 ace->in_irq = 0;
845 spin_unlock(&ace->lock);
846
847 return IRQ_HANDLED;
848}
849
850/* ---------------------------------------------------------------------
851 * Block ops
852 */
Jens Axboe165125e2007-07-24 09:28:11 +0200853static void ace_request(struct request_queue * q)
Grant Likely74489a92007-07-17 04:03:39 -0700854{
855 struct request *req;
856 struct ace_device *ace;
857
858 req = ace_get_next_request(q);
859
860 if (req) {
861 ace = req->rq_disk->private_data;
862 tasklet_schedule(&ace->fsm_tasklet);
863 }
864}
865
866static int ace_media_changed(struct gendisk *gd)
867{
868 struct ace_device *ace = gd->private_data;
869 dev_dbg(ace->dev, "ace_media_changed(): %i\n", ace->media_change);
870
871 return ace->media_change;
872}
873
874static int ace_revalidate_disk(struct gendisk *gd)
875{
876 struct ace_device *ace = gd->private_data;
877 unsigned long flags;
878
879 dev_dbg(ace->dev, "ace_revalidate_disk()\n");
880
881 if (ace->media_change) {
882 dev_dbg(ace->dev, "requesting cf id and scheduling tasklet\n");
883
884 spin_lock_irqsave(&ace->lock, flags);
885 ace->id_req_count++;
886 spin_unlock_irqrestore(&ace->lock, flags);
887
888 tasklet_schedule(&ace->fsm_tasklet);
889 wait_for_completion(&ace->id_completion);
890 }
891
892 dev_dbg(ace->dev, "revalidate complete\n");
893 return ace->id_result;
894}
895
Al Virof3f68b32008-03-02 10:24:18 -0500896static int ace_open(struct block_device *bdev, fmode_t mode)
Grant Likely74489a92007-07-17 04:03:39 -0700897{
Al Virof3f68b32008-03-02 10:24:18 -0500898 struct ace_device *ace = bdev->bd_disk->private_data;
Grant Likely74489a92007-07-17 04:03:39 -0700899 unsigned long flags;
900
901 dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);
902
Grant Likely74489a92007-07-17 04:03:39 -0700903 spin_lock_irqsave(&ace->lock, flags);
904 ace->users++;
905 spin_unlock_irqrestore(&ace->lock, flags);
906
Al Virof3f68b32008-03-02 10:24:18 -0500907 check_disk_change(bdev);
Grant Likely74489a92007-07-17 04:03:39 -0700908 return 0;
909}
910
Al Virof3f68b32008-03-02 10:24:18 -0500911static int ace_release(struct gendisk *disk, fmode_t mode)
Grant Likely74489a92007-07-17 04:03:39 -0700912{
Al Virof3f68b32008-03-02 10:24:18 -0500913 struct ace_device *ace = disk->private_data;
Grant Likely74489a92007-07-17 04:03:39 -0700914 unsigned long flags;
915 u16 val;
916
917 dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);
918
919 spin_lock_irqsave(&ace->lock, flags);
920 ace->users--;
921 if (ace->users == 0) {
922 val = ace_in(ace, ACE_CTRL);
923 ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
924 }
925 spin_unlock_irqrestore(&ace->lock, flags);
926 return 0;
927}
928
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200929static int ace_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Grant Likely74489a92007-07-17 04:03:39 -0700930{
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200931 struct ace_device *ace = bdev->bd_disk->private_data;
Grant Likelyf0edef82009-04-08 14:13:04 +0200932 u16 *cf_id = ace->cf_id;
Grant Likely74489a92007-07-17 04:03:39 -0700933
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200934 dev_dbg(ace->dev, "ace_getgeo()\n");
Grant Likely74489a92007-07-17 04:03:39 -0700935
Bartlomiej Zolnierkiewicz4aaf2fe2009-04-01 21:42:22 +0200936 geo->heads = cf_id[ATA_ID_HEADS];
937 geo->sectors = cf_id[ATA_ID_SECTORS];
938 geo->cylinders = cf_id[ATA_ID_CYLS];
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200939
940 return 0;
Grant Likely74489a92007-07-17 04:03:39 -0700941}
942
943static struct block_device_operations ace_fops = {
944 .owner = THIS_MODULE,
Al Virof3f68b32008-03-02 10:24:18 -0500945 .open = ace_open,
946 .release = ace_release,
Grant Likely74489a92007-07-17 04:03:39 -0700947 .media_changed = ace_media_changed,
948 .revalidate_disk = ace_revalidate_disk,
Christoph Hellwiga6b3a932007-08-11 22:34:31 +0200949 .getgeo = ace_getgeo,
Grant Likely74489a92007-07-17 04:03:39 -0700950};
951
952/* --------------------------------------------------------------------
953 * SystemACE device setup/teardown code
954 */
955static int __devinit ace_setup(struct ace_device *ace)
956{
957 u16 version;
958 u16 val;
Grant Likely74489a92007-07-17 04:03:39 -0700959 int rc;
960
Grant Likely4a24d862007-10-01 16:33:54 +0200961 dev_dbg(ace->dev, "ace_setup(ace=0x%p)\n", ace);
Yuri Tikhonovc14464b2008-11-14 10:21:57 -0700962 dev_dbg(ace->dev, "physaddr=0x%llx irq=%i\n",
963 (unsigned long long)ace->physaddr, ace->irq);
Grant Likely4a24d862007-10-01 16:33:54 +0200964
Grant Likely74489a92007-07-17 04:03:39 -0700965 spin_lock_init(&ace->lock);
966 init_completion(&ace->id_completion);
967
968 /*
969 * Map the device
970 */
971 ace->baseaddr = ioremap(ace->physaddr, 0x80);
972 if (!ace->baseaddr)
973 goto err_ioremap;
974
Grant Likely74489a92007-07-17 04:03:39 -0700975 /*
976 * Initialize the state machine tasklet and stall timer
977 */
978 tasklet_init(&ace->fsm_tasklet, ace_fsm_tasklet, (unsigned long)ace);
979 setup_timer(&ace->stall_timer, ace_stall_timer, (unsigned long)ace);
980
981 /*
982 * Initialize the request queue
983 */
984 ace->queue = blk_init_queue(ace_request, &ace->lock);
985 if (ace->queue == NULL)
986 goto err_blk_initq;
987 blk_queue_hardsect_size(ace->queue, 512);
988
989 /*
990 * Allocate and initialize GD structure
991 */
992 ace->gd = alloc_disk(ACE_NUM_MINORS);
993 if (!ace->gd)
994 goto err_alloc_disk;
995
996 ace->gd->major = ace_major;
997 ace->gd->first_minor = ace->id * ACE_NUM_MINORS;
998 ace->gd->fops = &ace_fops;
999 ace->gd->queue = ace->queue;
1000 ace->gd->private_data = ace;
1001 snprintf(ace->gd->disk_name, 32, "xs%c", ace->id + 'a');
1002
1003 /* set bus width */
Grant Likely4a24d862007-10-01 16:33:54 +02001004 if (ace->bus_width == ACE_BUS_WIDTH_16) {
Grant Likely74489a92007-07-17 04:03:39 -07001005 /* 0x0101 should work regardless of endianess */
1006 ace_out_le16(ace, ACE_BUSMODE, 0x0101);
1007
1008 /* read it back to determine endianess */
1009 if (ace_in_le16(ace, ACE_BUSMODE) == 0x0001)
1010 ace->reg_ops = &ace_reg_le16_ops;
1011 else
1012 ace->reg_ops = &ace_reg_be16_ops;
1013 } else {
1014 ace_out_8(ace, ACE_BUSMODE, 0x00);
1015 ace->reg_ops = &ace_reg_8_ops;
1016 }
1017
1018 /* Make sure version register is sane */
1019 version = ace_in(ace, ACE_VERSION);
1020 if ((version == 0) || (version == 0xFFFF))
1021 goto err_read;
1022
1023 /* Put sysace in a sane state by clearing most control reg bits */
1024 ace_out(ace, ACE_CTRL, ACE_CTRL_FORCECFGMODE |
1025 ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ);
1026
Grant Likely32f6fff2007-10-01 16:33:54 +02001027 /* Now we can hook up the irq handler */
1028 if (ace->irq != NO_IRQ) {
1029 rc = request_irq(ace->irq, ace_interrupt, 0, "systemace", ace);
1030 if (rc) {
1031 /* Failure - fall back to polled mode */
1032 dev_err(ace->dev, "request_irq failed\n");
1033 ace->irq = NO_IRQ;
1034 }
1035 }
1036
Grant Likelyd2bbf3d2007-10-04 08:52:40 +02001037 /* Enable interrupts */
1038 val = ace_in(ace, ACE_CTRL);
1039 val |= ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ;
1040 ace_out(ace, ACE_CTRL, val);
1041
Grant Likely74489a92007-07-17 04:03:39 -07001042 /* Print the identification */
1043 dev_info(ace->dev, "Xilinx SystemACE revision %i.%i.%i\n",
1044 (version >> 12) & 0xf, (version >> 8) & 0x0f, version & 0xff);
Yuri Tikhonovc14464b2008-11-14 10:21:57 -07001045 dev_dbg(ace->dev, "physaddr 0x%llx, mapped to 0x%p, irq=%i\n",
1046 (unsigned long long) ace->physaddr, ace->baseaddr, ace->irq);
Grant Likely74489a92007-07-17 04:03:39 -07001047
1048 ace->media_change = 1;
1049 ace_revalidate_disk(ace->gd);
1050
1051 /* Make the sysace device 'live' */
1052 add_disk(ace->gd);
1053
1054 return 0;
1055
Grant Likelyed155a92007-10-01 16:33:56 +02001056err_read:
Grant Likely74489a92007-07-17 04:03:39 -07001057 put_disk(ace->gd);
Grant Likelyed155a92007-10-01 16:33:56 +02001058err_alloc_disk:
Grant Likely74489a92007-07-17 04:03:39 -07001059 blk_cleanup_queue(ace->queue);
Grant Likelyed155a92007-10-01 16:33:56 +02001060err_blk_initq:
Grant Likely74489a92007-07-17 04:03:39 -07001061 iounmap(ace->baseaddr);
Grant Likelyed155a92007-10-01 16:33:56 +02001062err_ioremap:
Yuri Tikhonovc14464b2008-11-14 10:21:57 -07001063 dev_info(ace->dev, "xsysace: error initializing device at 0x%llx\n",
1064 (unsigned long long) ace->physaddr);
Grant Likely74489a92007-07-17 04:03:39 -07001065 return -ENOMEM;
1066}
1067
1068static void __devexit ace_teardown(struct ace_device *ace)
1069{
1070 if (ace->gd) {
1071 del_gendisk(ace->gd);
1072 put_disk(ace->gd);
1073 }
1074
1075 if (ace->queue)
1076 blk_cleanup_queue(ace->queue);
1077
1078 tasklet_kill(&ace->fsm_tasklet);
1079
1080 if (ace->irq != NO_IRQ)
1081 free_irq(ace->irq, ace);
1082
1083 iounmap(ace->baseaddr);
1084}
1085
Grant Likely1b455462007-10-01 16:33:53 +02001086static int __devinit
Yuri Tikhonovc14464b2008-11-14 10:21:57 -07001087ace_alloc(struct device *dev, int id, resource_size_t physaddr,
Grant Likely1b455462007-10-01 16:33:53 +02001088 int irq, int bus_width)
1089{
1090 struct ace_device *ace;
1091 int rc;
1092 dev_dbg(dev, "ace_alloc(%p)\n", dev);
1093
1094 if (!physaddr) {
1095 rc = -ENODEV;
1096 goto err_noreg;
1097 }
1098
1099 /* Allocate and initialize the ace device structure */
1100 ace = kzalloc(sizeof(struct ace_device), GFP_KERNEL);
1101 if (!ace) {
1102 rc = -ENOMEM;
1103 goto err_alloc;
1104 }
1105
1106 ace->dev = dev;
1107 ace->id = id;
1108 ace->physaddr = physaddr;
1109 ace->irq = irq;
1110 ace->bus_width = bus_width;
1111
1112 /* Call the setup code */
Grant Likely34e1b832007-10-04 08:52:38 +02001113 rc = ace_setup(ace);
1114 if (rc)
Grant Likely1b455462007-10-01 16:33:53 +02001115 goto err_setup;
1116
1117 dev_set_drvdata(dev, ace);
1118 return 0;
1119
Grant Likelyed155a92007-10-01 16:33:56 +02001120err_setup:
Grant Likely1b455462007-10-01 16:33:53 +02001121 dev_set_drvdata(dev, NULL);
1122 kfree(ace);
Grant Likelyed155a92007-10-01 16:33:56 +02001123err_alloc:
1124err_noreg:
Grant Likely1b455462007-10-01 16:33:53 +02001125 dev_err(dev, "could not initialize device, err=%i\n", rc);
1126 return rc;
1127}
1128
1129static void __devexit ace_free(struct device *dev)
1130{
1131 struct ace_device *ace = dev_get_drvdata(dev);
1132 dev_dbg(dev, "ace_free(%p)\n", dev);
1133
1134 if (ace) {
1135 ace_teardown(ace);
1136 dev_set_drvdata(dev, NULL);
1137 kfree(ace);
1138 }
1139}
1140
Grant Likely74489a92007-07-17 04:03:39 -07001141/* ---------------------------------------------------------------------
1142 * Platform Bus Support
1143 */
1144
Grant Likelyedec4962007-10-01 16:33:52 +02001145static int __devinit ace_probe(struct platform_device *dev)
Grant Likely74489a92007-07-17 04:03:39 -07001146{
Yuri Tikhonovc14464b2008-11-14 10:21:57 -07001147 resource_size_t physaddr = 0;
Grant Likely4a24d862007-10-01 16:33:54 +02001148 int bus_width = ACE_BUS_WIDTH_16; /* FIXME: should not be hard coded */
Grant Likely1b455462007-10-01 16:33:53 +02001149 int id = dev->id;
1150 int irq = NO_IRQ;
Grant Likely74489a92007-07-17 04:03:39 -07001151 int i;
1152
Grant Likelyedec4962007-10-01 16:33:52 +02001153 dev_dbg(&dev->dev, "ace_probe(%p)\n", dev);
Grant Likely74489a92007-07-17 04:03:39 -07001154
Grant Likely74489a92007-07-17 04:03:39 -07001155 for (i = 0; i < dev->num_resources; i++) {
1156 if (dev->resource[i].flags & IORESOURCE_MEM)
Grant Likely1b455462007-10-01 16:33:53 +02001157 physaddr = dev->resource[i].start;
Grant Likely74489a92007-07-17 04:03:39 -07001158 if (dev->resource[i].flags & IORESOURCE_IRQ)
Grant Likely1b455462007-10-01 16:33:53 +02001159 irq = dev->resource[i].start;
Grant Likely74489a92007-07-17 04:03:39 -07001160 }
1161
Grant Likely74489a92007-07-17 04:03:39 -07001162 /* Call the bus-independant setup code */
Grant Likely1b455462007-10-01 16:33:53 +02001163 return ace_alloc(&dev->dev, id, physaddr, irq, bus_width);
Grant Likely74489a92007-07-17 04:03:39 -07001164}
1165
1166/*
1167 * Platform bus remove() method
1168 */
Grant Likelyedec4962007-10-01 16:33:52 +02001169static int __devexit ace_remove(struct platform_device *dev)
Grant Likely74489a92007-07-17 04:03:39 -07001170{
Grant Likely1b455462007-10-01 16:33:53 +02001171 ace_free(&dev->dev);
Grant Likely74489a92007-07-17 04:03:39 -07001172 return 0;
1173}
1174
Grant Likelyedec4962007-10-01 16:33:52 +02001175static struct platform_driver ace_platform_driver = {
Grant Likely74489a92007-07-17 04:03:39 -07001176 .probe = ace_probe,
1177 .remove = __devexit_p(ace_remove),
Grant Likelyedec4962007-10-01 16:33:52 +02001178 .driver = {
1179 .owner = THIS_MODULE,
1180 .name = "xsysace",
1181 },
Grant Likely74489a92007-07-17 04:03:39 -07001182};
1183
1184/* ---------------------------------------------------------------------
Grant Likely95e896c2007-10-01 16:33:55 +02001185 * OF_Platform Bus Support
1186 */
1187
1188#if defined(CONFIG_OF)
1189static int __devinit
1190ace_of_probe(struct of_device *op, const struct of_device_id *match)
1191{
1192 struct resource res;
Yuri Tikhonovc14464b2008-11-14 10:21:57 -07001193 resource_size_t physaddr;
Grant Likely95e896c2007-10-01 16:33:55 +02001194 const u32 *id;
1195 int irq, bus_width, rc;
1196
1197 dev_dbg(&op->dev, "ace_of_probe(%p, %p)\n", op, match);
1198
1199 /* device id */
1200 id = of_get_property(op->node, "port-number", NULL);
1201
1202 /* physaddr */
1203 rc = of_address_to_resource(op->node, 0, &res);
1204 if (rc) {
1205 dev_err(&op->dev, "invalid address\n");
1206 return rc;
1207 }
1208 physaddr = res.start;
1209
1210 /* irq */
1211 irq = irq_of_parse_and_map(op->node, 0);
1212
1213 /* bus width */
1214 bus_width = ACE_BUS_WIDTH_16;
1215 if (of_find_property(op->node, "8-bit", NULL))
1216 bus_width = ACE_BUS_WIDTH_8;
1217
1218 /* Call the bus-independant setup code */
1219 return ace_alloc(&op->dev, id ? *id : 0, physaddr, irq, bus_width);
1220}
1221
1222static int __devexit ace_of_remove(struct of_device *op)
1223{
1224 ace_free(&op->dev);
1225 return 0;
1226}
1227
1228/* Match table for of_platform binding */
Grant Likely911a3172008-02-06 10:23:12 -07001229static struct of_device_id ace_of_match[] __devinitdata = {
Stephen Neuendorffer0e349b02008-01-09 06:35:05 +11001230 { .compatible = "xlnx,opb-sysace-1.00.b", },
1231 { .compatible = "xlnx,opb-sysace-1.00.c", },
1232 { .compatible = "xlnx,xps-sysace-1.00.a", },
Yuri Tikhonovf5020382009-01-09 15:49:06 -07001233 { .compatible = "xlnx,sysace", },
Grant Likely95e896c2007-10-01 16:33:55 +02001234 {},
1235};
1236MODULE_DEVICE_TABLE(of, ace_of_match);
1237
1238static struct of_platform_driver ace_of_driver = {
1239 .owner = THIS_MODULE,
1240 .name = "xsysace",
1241 .match_table = ace_of_match,
1242 .probe = ace_of_probe,
1243 .remove = __devexit_p(ace_of_remove),
1244 .driver = {
1245 .name = "xsysace",
1246 },
1247};
1248
1249/* Registration helpers to keep the number of #ifdefs to a minimum */
1250static inline int __init ace_of_register(void)
1251{
1252 pr_debug("xsysace: registering OF binding\n");
1253 return of_register_platform_driver(&ace_of_driver);
1254}
1255
1256static inline void __exit ace_of_unregister(void)
1257{
1258 of_unregister_platform_driver(&ace_of_driver);
1259}
1260#else /* CONFIG_OF */
1261/* CONFIG_OF not enabled; do nothing helpers */
1262static inline int __init ace_of_register(void) { return 0; }
1263static inline void __exit ace_of_unregister(void) { }
1264#endif /* CONFIG_OF */
1265
1266/* ---------------------------------------------------------------------
Grant Likely74489a92007-07-17 04:03:39 -07001267 * Module init/exit routines
1268 */
1269static int __init ace_init(void)
1270{
Grant Likelyedec4962007-10-01 16:33:52 +02001271 int rc;
1272
Grant Likely74489a92007-07-17 04:03:39 -07001273 ace_major = register_blkdev(ace_major, "xsysace");
1274 if (ace_major <= 0) {
Grant Likelyedec4962007-10-01 16:33:52 +02001275 rc = -ENOMEM;
1276 goto err_blk;
Grant Likely74489a92007-07-17 04:03:39 -07001277 }
1278
Grant Likely34e1b832007-10-04 08:52:38 +02001279 rc = ace_of_register();
1280 if (rc)
Grant Likely95e896c2007-10-01 16:33:55 +02001281 goto err_of;
1282
Grant Likely4a24d862007-10-01 16:33:54 +02001283 pr_debug("xsysace: registering platform binding\n");
Grant Likely34e1b832007-10-04 08:52:38 +02001284 rc = platform_driver_register(&ace_platform_driver);
1285 if (rc)
Grant Likelyedec4962007-10-01 16:33:52 +02001286 goto err_plat;
1287
1288 pr_info("Xilinx SystemACE device driver, major=%i\n", ace_major);
1289 return 0;
1290
Grant Likelyed155a92007-10-01 16:33:56 +02001291err_plat:
Grant Likely95e896c2007-10-01 16:33:55 +02001292 ace_of_unregister();
Grant Likelyed155a92007-10-01 16:33:56 +02001293err_of:
Grant Likelyedec4962007-10-01 16:33:52 +02001294 unregister_blkdev(ace_major, "xsysace");
Grant Likelyed155a92007-10-01 16:33:56 +02001295err_blk:
Grant Likelyedec4962007-10-01 16:33:52 +02001296 printk(KERN_ERR "xsysace: registration failed; err=%i\n", rc);
1297 return rc;
Grant Likely74489a92007-07-17 04:03:39 -07001298}
1299
1300static void __exit ace_exit(void)
1301{
1302 pr_debug("Unregistering Xilinx SystemACE driver\n");
Grant Likelyedec4962007-10-01 16:33:52 +02001303 platform_driver_unregister(&ace_platform_driver);
Grant Likely95e896c2007-10-01 16:33:55 +02001304 ace_of_unregister();
Akinobu Mitac6d4d632007-07-17 04:03:46 -07001305 unregister_blkdev(ace_major, "xsysace");
Grant Likely74489a92007-07-17 04:03:39 -07001306}
1307
1308module_init(ace_init);
1309module_exit(ace_exit);