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74489a91 GL |
1 | /* |
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> | |
4aaf2fec | 92 | #include <linux/ata.h> |
74489a91 GL |
93 | #include <linux/hdreg.h> |
94 | #include <linux/platform_device.h> | |
95e896c3 GL |
95 | #if defined(CONFIG_OF) |
96 | #include <linux/of_device.h> | |
97 | #include <linux/of_platform.h> | |
98 | #endif | |
74489a91 GL |
99 | |
100 | MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); | |
101 | MODULE_DESCRIPTION("Xilinx SystemACE device driver"); | |
102 | MODULE_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 | ||
4a24d861 GL |
166 | #define ACE_BUS_WIDTH_8 0 |
167 | #define ACE_BUS_WIDTH_16 1 | |
168 | ||
74489a91 GL |
169 | struct ace_reg_ops; |
170 | ||
171 | struct 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 */ | |
c14464bf | 198 | resource_size_t physaddr; |
b5515d86 | 199 | void __iomem *baseaddr; |
74489a91 GL |
200 | 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 */ | |
4aaf2fec | 212 | u16 cf_id[ATA_ID_WORDS]; |
74489a91 GL |
213 | }; |
214 | ||
215 | static int ace_major; | |
216 | ||
217 | /* --------------------------------------------------------------------- | |
218 | * Low level register access | |
219 | */ | |
220 | ||
221 | struct 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 */ | |
229 | static u16 ace_in_8(struct ace_device *ace, int reg) | |
230 | { | |
b5515d86 | 231 | void __iomem *r = ace->baseaddr + reg; |
74489a91 GL |
232 | return in_8(r) | (in_8(r + 1) << 8); |
233 | } | |
234 | ||
235 | static void ace_out_8(struct ace_device *ace, int reg, u16 val) | |
236 | { | |
b5515d86 | 237 | void __iomem *r = ace->baseaddr + reg; |
74489a91 GL |
238 | out_8(r, val); |
239 | out_8(r + 1, val >> 8); | |
240 | } | |
241 | ||
242 | static void ace_datain_8(struct ace_device *ace) | |
243 | { | |
b5515d86 | 244 | void __iomem *r = ace->baseaddr + 0x40; |
74489a91 GL |
245 | 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 | ||
252 | static void ace_dataout_8(struct ace_device *ace) | |
253 | { | |
b5515d86 | 254 | void __iomem *r = ace->baseaddr + 0x40; |
74489a91 GL |
255 | 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 | ||
262 | static 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 */ | |
270 | static u16 ace_in_be16(struct ace_device *ace, int reg) | |
271 | { | |
272 | return in_be16(ace->baseaddr + reg); | |
273 | } | |
274 | ||
275 | static void ace_out_be16(struct ace_device *ace, int reg, u16 val) | |
276 | { | |
277 | out_be16(ace->baseaddr + reg, val); | |
278 | } | |
279 | ||
280 | static 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 | ||
289 | static 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 */ | |
299 | static u16 ace_in_le16(struct ace_device *ace, int reg) | |
300 | { | |
301 | return in_le16(ace->baseaddr + reg); | |
302 | } | |
303 | ||
304 | static void ace_out_le16(struct ace_device *ace, int reg, u16 val) | |
305 | { | |
306 | out_le16(ace->baseaddr + reg, val); | |
307 | } | |
308 | ||
309 | static 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 | ||
318 | static 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 | ||
327 | static 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 | ||
334 | static 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 | ||
341 | static inline u16 ace_in(struct ace_device *ace, int reg) | |
342 | { | |
343 | return ace->reg_ops->in(ace, reg); | |
344 | } | |
345 | ||
346 | static 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 | ||
351 | static inline void ace_out(struct ace_device *ace, int reg, u16 val) | |
352 | { | |
353 | ace->reg_ops->out(ace, reg, val); | |
354 | } | |
355 | ||
356 | static 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) | |
367 | static 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 | |
386 | static inline void ace_dump_mem(void *base, int len) | |
387 | { | |
388 | } | |
389 | #endif | |
390 | ||
391 | static void ace_dump_regs(struct ace_device *ace) | |
392 | { | |
393 | dev_info(ace->dev, " ctrl: %.8x seccnt/cmd: %.4x ver:%.4x\n" | |
898eb71c JP |
394 | KERN_INFO " status:%.8x mpu_lba:%.8x busmode:%4x\n" |
395 | KERN_INFO " error: %.8x cfg_lba:%.8x fatstat:%.4x\n", | |
74489a91 GL |
396 | 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 | ||
4aaf2fec | 406 | void ace_fix_driveid(u16 *id) |
74489a91 GL |
407 | { |
408 | #if defined(__BIG_ENDIAN) | |
74489a91 GL |
409 | int i; |
410 | ||
411 | /* All half words have wrong byte order; swap the bytes */ | |
4aaf2fec BZ |
412 | for (i = 0; i < ATA_ID_WORDS; i++, id++) |
413 | *id = le16_to_cpu(*id); | |
74489a91 GL |
414 | #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 */ | |
443 | static 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 */ | |
451 | static 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 */ | |
165125e1 | 462 | struct request *ace_get_next_request(struct request_queue * q) |
74489a91 GL |
463 | { |
464 | struct request *req; | |
465 | ||
466 | while ((req = elv_next_request(q)) != NULL) { | |
467 | if (blk_fs_request(req)) | |
468 | break; | |
f06d9a2b | 469 | __blk_end_request_cur(req, -EIO); |
74489a91 GL |
470 | } |
471 | return req; | |
472 | } | |
473 | ||
474 | static void ace_fsm_dostate(struct ace_device *ace) | |
475 | { | |
476 | struct request *req; | |
477 | u32 status; | |
478 | u16 val; | |
479 | int count; | |
74489a91 GL |
480 | |
481 | #if defined(DEBUG) | |
482 | dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n", | |
483 | ace->fsm_state, ace->id_req_count); | |
484 | #endif | |
485 | ||
bfbd442f GL |
486 | /* Verify that there is actually a CF in the slot. If not, then |
487 | * bail out back to the idle state and wake up all the waiters */ | |
488 | status = ace_in32(ace, ACE_STATUS); | |
489 | if ((status & ACE_STATUS_CFDETECT) == 0) { | |
490 | ace->fsm_state = ACE_FSM_STATE_IDLE; | |
491 | ace->media_change = 1; | |
492 | set_capacity(ace->gd, 0); | |
493 | dev_info(ace->dev, "No CF in slot\n"); | |
494 | ||
495 | /* Drop all pending requests */ | |
496 | while ((req = elv_next_request(ace->queue)) != NULL) | |
f06d9a2b | 497 | __blk_end_request_cur(req, -EIO); |
bfbd442f GL |
498 | |
499 | /* Drop back to IDLE state and notify waiters */ | |
500 | ace->fsm_state = ACE_FSM_STATE_IDLE; | |
501 | ace->id_result = -EIO; | |
502 | while (ace->id_req_count) { | |
503 | complete(&ace->id_completion); | |
504 | ace->id_req_count--; | |
505 | } | |
506 | } | |
507 | ||
74489a91 GL |
508 | switch (ace->fsm_state) { |
509 | case ACE_FSM_STATE_IDLE: | |
510 | /* See if there is anything to do */ | |
511 | if (ace->id_req_count || ace_get_next_request(ace->queue)) { | |
512 | ace->fsm_iter_num++; | |
513 | ace->fsm_state = ACE_FSM_STATE_REQ_LOCK; | |
514 | mod_timer(&ace->stall_timer, jiffies + HZ); | |
515 | if (!timer_pending(&ace->stall_timer)) | |
516 | add_timer(&ace->stall_timer); | |
517 | break; | |
518 | } | |
519 | del_timer(&ace->stall_timer); | |
520 | ace->fsm_continue_flag = 0; | |
521 | break; | |
522 | ||
523 | case ACE_FSM_STATE_REQ_LOCK: | |
524 | if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) { | |
525 | /* Already have the lock, jump to next state */ | |
526 | ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY; | |
527 | break; | |
528 | } | |
529 | ||
530 | /* Request the lock */ | |
531 | val = ace_in(ace, ACE_CTRL); | |
532 | ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ); | |
533 | ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK; | |
534 | break; | |
535 | ||
536 | case ACE_FSM_STATE_WAIT_LOCK: | |
537 | if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) { | |
538 | /* got the lock; move to next state */ | |
539 | ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY; | |
540 | break; | |
541 | } | |
542 | ||
543 | /* wait a bit for the lock */ | |
544 | ace_fsm_yield(ace); | |
545 | break; | |
546 | ||
547 | case ACE_FSM_STATE_WAIT_CFREADY: | |
548 | status = ace_in32(ace, ACE_STATUS); | |
549 | if (!(status & ACE_STATUS_RDYFORCFCMD) || | |
550 | (status & ACE_STATUS_CFBSY)) { | |
551 | /* CF card isn't ready; it needs to be polled */ | |
552 | ace_fsm_yield(ace); | |
553 | break; | |
554 | } | |
555 | ||
556 | /* Device is ready for command; determine what to do next */ | |
557 | if (ace->id_req_count) | |
558 | ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE; | |
559 | else | |
560 | ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE; | |
561 | break; | |
562 | ||
563 | case ACE_FSM_STATE_IDENTIFY_PREPARE: | |
564 | /* Send identify command */ | |
565 | ace->fsm_task = ACE_TASK_IDENTIFY; | |
f0edef8c | 566 | ace->data_ptr = ace->cf_id; |
74489a91 GL |
567 | ace->data_count = ACE_BUF_PER_SECTOR; |
568 | ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY); | |
569 | ||
570 | /* As per datasheet, put config controller in reset */ | |
571 | val = ace_in(ace, ACE_CTRL); | |
572 | ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET); | |
573 | ||
574 | /* irq handler takes over from this point; wait for the | |
575 | * transfer to complete */ | |
576 | ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER; | |
577 | ace_fsm_yieldirq(ace); | |
578 | break; | |
579 | ||
580 | case ACE_FSM_STATE_IDENTIFY_TRANSFER: | |
581 | /* Check that the sysace is ready to receive data */ | |
582 | status = ace_in32(ace, ACE_STATUS); | |
583 | if (status & ACE_STATUS_CFBSY) { | |
584 | dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n", | |
585 | ace->fsm_task, ace->fsm_iter_num, | |
586 | ace->data_count); | |
587 | ace_fsm_yield(ace); | |
588 | break; | |
589 | } | |
590 | if (!(status & ACE_STATUS_DATABUFRDY)) { | |
591 | ace_fsm_yield(ace); | |
592 | break; | |
593 | } | |
594 | ||
595 | /* Transfer the next buffer */ | |
596 | ace->reg_ops->datain(ace); | |
597 | ace->data_count--; | |
598 | ||
599 | /* If there are still buffers to be transfers; jump out here */ | |
600 | if (ace->data_count != 0) { | |
601 | ace_fsm_yieldirq(ace); | |
602 | break; | |
603 | } | |
604 | ||
605 | /* transfer finished; kick state machine */ | |
606 | dev_dbg(ace->dev, "identify finished\n"); | |
607 | ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE; | |
608 | break; | |
609 | ||
610 | case ACE_FSM_STATE_IDENTIFY_COMPLETE: | |
f0edef8c GL |
611 | ace_fix_driveid(ace->cf_id); |
612 | ace_dump_mem(ace->cf_id, 512); /* Debug: Dump out disk ID */ | |
74489a91 GL |
613 | |
614 | if (ace->data_result) { | |
615 | /* Error occured, disable the disk */ | |
616 | ace->media_change = 1; | |
617 | set_capacity(ace->gd, 0); | |
618 | dev_err(ace->dev, "error fetching CF id (%i)\n", | |
619 | ace->data_result); | |
620 | } else { | |
621 | ace->media_change = 0; | |
622 | ||
623 | /* Record disk parameters */ | |
4aaf2fec | 624 | set_capacity(ace->gd, |
f0edef8c | 625 | ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY)); |
74489a91 | 626 | dev_info(ace->dev, "capacity: %i sectors\n", |
f0edef8c | 627 | ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY)); |
74489a91 GL |
628 | } |
629 | ||
630 | /* We're done, drop to IDLE state and notify waiters */ | |
631 | ace->fsm_state = ACE_FSM_STATE_IDLE; | |
632 | ace->id_result = ace->data_result; | |
633 | while (ace->id_req_count) { | |
634 | complete(&ace->id_completion); | |
635 | ace->id_req_count--; | |
636 | } | |
637 | break; | |
638 | ||
639 | case ACE_FSM_STATE_REQ_PREPARE: | |
640 | req = ace_get_next_request(ace->queue); | |
641 | if (!req) { | |
642 | ace->fsm_state = ACE_FSM_STATE_IDLE; | |
643 | break; | |
644 | } | |
645 | ||
646 | /* Okay, it's a data request, set it up for transfer */ | |
647 | dev_dbg(ace->dev, | |
5b93629b | 648 | "request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n", |
83096ebf TH |
649 | (unsigned long long)blk_rq_pos(req), |
650 | blk_rq_sectors(req), blk_rq_cur_sectors(req), | |
651 | rq_data_dir(req)); | |
74489a91 GL |
652 | |
653 | ace->req = req; | |
654 | ace->data_ptr = req->buffer; | |
83096ebf TH |
655 | ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR; |
656 | ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF); | |
74489a91 | 657 | |
5b93629b | 658 | count = blk_rq_sectors(req); |
74489a91 GL |
659 | if (rq_data_dir(req)) { |
660 | /* Kick off write request */ | |
661 | dev_dbg(ace->dev, "write data\n"); | |
662 | ace->fsm_task = ACE_TASK_WRITE; | |
663 | ace_out(ace, ACE_SECCNTCMD, | |
664 | count | ACE_SECCNTCMD_WRITE_DATA); | |
665 | } else { | |
666 | /* Kick off read request */ | |
667 | dev_dbg(ace->dev, "read data\n"); | |
668 | ace->fsm_task = ACE_TASK_READ; | |
669 | ace_out(ace, ACE_SECCNTCMD, | |
670 | count | ACE_SECCNTCMD_READ_DATA); | |
671 | } | |
672 | ||
673 | /* As per datasheet, put config controller in reset */ | |
674 | val = ace_in(ace, ACE_CTRL); | |
675 | ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET); | |
676 | ||
677 | /* Move to the transfer state. The systemace will raise | |
678 | * an interrupt once there is something to do | |
679 | */ | |
680 | ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER; | |
681 | if (ace->fsm_task == ACE_TASK_READ) | |
682 | ace_fsm_yieldirq(ace); /* wait for data ready */ | |
683 | break; | |
684 | ||
685 | case ACE_FSM_STATE_REQ_TRANSFER: | |
686 | /* Check that the sysace is ready to receive data */ | |
687 | status = ace_in32(ace, ACE_STATUS); | |
688 | if (status & ACE_STATUS_CFBSY) { | |
689 | dev_dbg(ace->dev, | |
690 | "CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n", | |
691 | ace->fsm_task, ace->fsm_iter_num, | |
83096ebf | 692 | blk_rq_cur_sectors(ace->req) * 16, |
74489a91 GL |
693 | ace->data_count, ace->in_irq); |
694 | ace_fsm_yield(ace); /* need to poll CFBSY bit */ | |
695 | break; | |
696 | } | |
697 | if (!(status & ACE_STATUS_DATABUFRDY)) { | |
698 | dev_dbg(ace->dev, | |
699 | "DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n", | |
700 | ace->fsm_task, ace->fsm_iter_num, | |
83096ebf | 701 | blk_rq_cur_sectors(ace->req) * 16, |
74489a91 GL |
702 | ace->data_count, ace->in_irq); |
703 | ace_fsm_yieldirq(ace); | |
704 | break; | |
705 | } | |
706 | ||
707 | /* Transfer the next buffer */ | |
74489a91 GL |
708 | if (ace->fsm_task == ACE_TASK_WRITE) |
709 | ace->reg_ops->dataout(ace); | |
710 | else | |
711 | ace->reg_ops->datain(ace); | |
712 | ace->data_count--; | |
713 | ||
714 | /* If there are still buffers to be transfers; jump out here */ | |
715 | if (ace->data_count != 0) { | |
716 | ace_fsm_yieldirq(ace); | |
717 | break; | |
718 | } | |
719 | ||
720 | /* bio finished; is there another one? */ | |
9bf72259 JA |
721 | if (__blk_end_request(ace->req, 0, |
722 | blk_rq_cur_bytes(ace->req))) { | |
5b93629b TH |
723 | /* dev_dbg(ace->dev, "next block; h=%u c=%u\n", |
724 | * blk_rq_sectors(ace->req), | |
83096ebf | 725 | * blk_rq_cur_sectors(ace->req)); |
74489a91 GL |
726 | */ |
727 | ace->data_ptr = ace->req->buffer; | |
83096ebf | 728 | ace->data_count = blk_rq_cur_sectors(ace->req) * 16; |
74489a91 GL |
729 | ace_fsm_yieldirq(ace); |
730 | break; | |
731 | } | |
732 | ||
733 | ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE; | |
734 | break; | |
735 | ||
736 | case ACE_FSM_STATE_REQ_COMPLETE: | |
74489a91 GL |
737 | ace->req = NULL; |
738 | ||
739 | /* Finished request; go to idle state */ | |
740 | ace->fsm_state = ACE_FSM_STATE_IDLE; | |
741 | break; | |
742 | ||
743 | default: | |
744 | ace->fsm_state = ACE_FSM_STATE_IDLE; | |
745 | break; | |
746 | } | |
747 | } | |
748 | ||
749 | static void ace_fsm_tasklet(unsigned long data) | |
750 | { | |
751 | struct ace_device *ace = (void *)data; | |
752 | unsigned long flags; | |
753 | ||
754 | spin_lock_irqsave(&ace->lock, flags); | |
755 | ||
756 | /* Loop over state machine until told to stop */ | |
757 | ace->fsm_continue_flag = 1; | |
758 | while (ace->fsm_continue_flag) | |
759 | ace_fsm_dostate(ace); | |
760 | ||
761 | spin_unlock_irqrestore(&ace->lock, flags); | |
762 | } | |
763 | ||
764 | static void ace_stall_timer(unsigned long data) | |
765 | { | |
766 | struct ace_device *ace = (void *)data; | |
767 | unsigned long flags; | |
768 | ||
769 | dev_warn(ace->dev, | |
770 | "kicking stalled fsm; state=%i task=%i iter=%i dc=%i\n", | |
771 | ace->fsm_state, ace->fsm_task, ace->fsm_iter_num, | |
772 | ace->data_count); | |
773 | spin_lock_irqsave(&ace->lock, flags); | |
774 | ||
775 | /* Rearm the stall timer *before* entering FSM (which may then | |
776 | * delete the timer) */ | |
777 | mod_timer(&ace->stall_timer, jiffies + HZ); | |
778 | ||
779 | /* Loop over state machine until told to stop */ | |
780 | ace->fsm_continue_flag = 1; | |
781 | while (ace->fsm_continue_flag) | |
782 | ace_fsm_dostate(ace); | |
783 | ||
784 | spin_unlock_irqrestore(&ace->lock, flags); | |
785 | } | |
786 | ||
787 | /* --------------------------------------------------------------------- | |
788 | * Interrupt handling routines | |
789 | */ | |
790 | static int ace_interrupt_checkstate(struct ace_device *ace) | |
791 | { | |
792 | u32 sreg = ace_in32(ace, ACE_STATUS); | |
793 | u16 creg = ace_in(ace, ACE_CTRL); | |
794 | ||
795 | /* Check for error occurance */ | |
796 | if ((sreg & (ACE_STATUS_CFGERROR | ACE_STATUS_CFCERROR)) && | |
797 | (creg & ACE_CTRL_ERRORIRQ)) { | |
798 | dev_err(ace->dev, "transfer failure\n"); | |
799 | ace_dump_regs(ace); | |
800 | return -EIO; | |
801 | } | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | static irqreturn_t ace_interrupt(int irq, void *dev_id) | |
807 | { | |
808 | u16 creg; | |
809 | struct ace_device *ace = dev_id; | |
810 | ||
811 | /* be safe and get the lock */ | |
812 | spin_lock(&ace->lock); | |
813 | ace->in_irq = 1; | |
814 | ||
815 | /* clear the interrupt */ | |
816 | creg = ace_in(ace, ACE_CTRL); | |
817 | ace_out(ace, ACE_CTRL, creg | ACE_CTRL_RESETIRQ); | |
818 | ace_out(ace, ACE_CTRL, creg); | |
819 | ||
820 | /* check for IO failures */ | |
821 | if (ace_interrupt_checkstate(ace)) | |
822 | ace->data_result = -EIO; | |
823 | ||
824 | if (ace->fsm_task == 0) { | |
825 | dev_err(ace->dev, | |
826 | "spurious irq; stat=%.8x ctrl=%.8x cmd=%.4x\n", | |
827 | ace_in32(ace, ACE_STATUS), ace_in32(ace, ACE_CTRL), | |
828 | ace_in(ace, ACE_SECCNTCMD)); | |
829 | dev_err(ace->dev, "fsm_task=%i fsm_state=%i data_count=%i\n", | |
830 | ace->fsm_task, ace->fsm_state, ace->data_count); | |
831 | } | |
832 | ||
833 | /* Loop over state machine until told to stop */ | |
834 | ace->fsm_continue_flag = 1; | |
835 | while (ace->fsm_continue_flag) | |
836 | ace_fsm_dostate(ace); | |
837 | ||
838 | /* done with interrupt; drop the lock */ | |
839 | ace->in_irq = 0; | |
840 | spin_unlock(&ace->lock); | |
841 | ||
842 | return IRQ_HANDLED; | |
843 | } | |
844 | ||
845 | /* --------------------------------------------------------------------- | |
846 | * Block ops | |
847 | */ | |
165125e1 | 848 | static void ace_request(struct request_queue * q) |
74489a91 GL |
849 | { |
850 | struct request *req; | |
851 | struct ace_device *ace; | |
852 | ||
853 | req = ace_get_next_request(q); | |
854 | ||
855 | if (req) { | |
856 | ace = req->rq_disk->private_data; | |
857 | tasklet_schedule(&ace->fsm_tasklet); | |
858 | } | |
859 | } | |
860 | ||
861 | static int ace_media_changed(struct gendisk *gd) | |
862 | { | |
863 | struct ace_device *ace = gd->private_data; | |
864 | dev_dbg(ace->dev, "ace_media_changed(): %i\n", ace->media_change); | |
865 | ||
866 | return ace->media_change; | |
867 | } | |
868 | ||
869 | static int ace_revalidate_disk(struct gendisk *gd) | |
870 | { | |
871 | struct ace_device *ace = gd->private_data; | |
872 | unsigned long flags; | |
873 | ||
874 | dev_dbg(ace->dev, "ace_revalidate_disk()\n"); | |
875 | ||
876 | if (ace->media_change) { | |
877 | dev_dbg(ace->dev, "requesting cf id and scheduling tasklet\n"); | |
878 | ||
879 | spin_lock_irqsave(&ace->lock, flags); | |
880 | ace->id_req_count++; | |
881 | spin_unlock_irqrestore(&ace->lock, flags); | |
882 | ||
883 | tasklet_schedule(&ace->fsm_tasklet); | |
884 | wait_for_completion(&ace->id_completion); | |
885 | } | |
886 | ||
887 | dev_dbg(ace->dev, "revalidate complete\n"); | |
888 | return ace->id_result; | |
889 | } | |
890 | ||
f3f68b36 | 891 | static int ace_open(struct block_device *bdev, fmode_t mode) |
74489a91 | 892 | { |
f3f68b36 | 893 | struct ace_device *ace = bdev->bd_disk->private_data; |
74489a91 GL |
894 | unsigned long flags; |
895 | ||
896 | dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1); | |
897 | ||
74489a91 GL |
898 | spin_lock_irqsave(&ace->lock, flags); |
899 | ace->users++; | |
900 | spin_unlock_irqrestore(&ace->lock, flags); | |
901 | ||
f3f68b36 | 902 | check_disk_change(bdev); |
74489a91 GL |
903 | return 0; |
904 | } | |
905 | ||
f3f68b36 | 906 | static int ace_release(struct gendisk *disk, fmode_t mode) |
74489a91 | 907 | { |
f3f68b36 | 908 | struct ace_device *ace = disk->private_data; |
74489a91 GL |
909 | unsigned long flags; |
910 | u16 val; | |
911 | ||
912 | dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1); | |
913 | ||
914 | spin_lock_irqsave(&ace->lock, flags); | |
915 | ace->users--; | |
916 | if (ace->users == 0) { | |
917 | val = ace_in(ace, ACE_CTRL); | |
918 | ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ); | |
919 | } | |
920 | spin_unlock_irqrestore(&ace->lock, flags); | |
921 | return 0; | |
922 | } | |
923 | ||
a6b3a93e | 924 | static int ace_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
74489a91 | 925 | { |
a6b3a93e | 926 | struct ace_device *ace = bdev->bd_disk->private_data; |
f0edef8c | 927 | u16 *cf_id = ace->cf_id; |
74489a91 | 928 | |
a6b3a93e CH |
929 | dev_dbg(ace->dev, "ace_getgeo()\n"); |
930 | ||
4aaf2fec BZ |
931 | geo->heads = cf_id[ATA_ID_HEADS]; |
932 | geo->sectors = cf_id[ATA_ID_SECTORS]; | |
933 | geo->cylinders = cf_id[ATA_ID_CYLS]; | |
a6b3a93e CH |
934 | |
935 | return 0; | |
74489a91 GL |
936 | } |
937 | ||
938 | static struct block_device_operations ace_fops = { | |
939 | .owner = THIS_MODULE, | |
f3f68b36 AV |
940 | .open = ace_open, |
941 | .release = ace_release, | |
74489a91 GL |
942 | .media_changed = ace_media_changed, |
943 | .revalidate_disk = ace_revalidate_disk, | |
a6b3a93e | 944 | .getgeo = ace_getgeo, |
74489a91 GL |
945 | }; |
946 | ||
947 | /* -------------------------------------------------------------------- | |
948 | * SystemACE device setup/teardown code | |
949 | */ | |
950 | static int __devinit ace_setup(struct ace_device *ace) | |
951 | { | |
952 | u16 version; | |
953 | u16 val; | |
74489a91 GL |
954 | int rc; |
955 | ||
4a24d861 | 956 | dev_dbg(ace->dev, "ace_setup(ace=0x%p)\n", ace); |
c14464bf YT |
957 | dev_dbg(ace->dev, "physaddr=0x%llx irq=%i\n", |
958 | (unsigned long long)ace->physaddr, ace->irq); | |
4a24d861 | 959 | |
74489a91 GL |
960 | spin_lock_init(&ace->lock); |
961 | init_completion(&ace->id_completion); | |
962 | ||
963 | /* | |
964 | * Map the device | |
965 | */ | |
966 | ace->baseaddr = ioremap(ace->physaddr, 0x80); | |
967 | if (!ace->baseaddr) | |
968 | goto err_ioremap; | |
969 | ||
74489a91 GL |
970 | /* |
971 | * Initialize the state machine tasklet and stall timer | |
972 | */ | |
973 | tasklet_init(&ace->fsm_tasklet, ace_fsm_tasklet, (unsigned long)ace); | |
974 | setup_timer(&ace->stall_timer, ace_stall_timer, (unsigned long)ace); | |
975 | ||
976 | /* | |
977 | * Initialize the request queue | |
978 | */ | |
979 | ace->queue = blk_init_queue(ace_request, &ace->lock); | |
980 | if (ace->queue == NULL) | |
981 | goto err_blk_initq; | |
982 | blk_queue_hardsect_size(ace->queue, 512); | |
983 | ||
984 | /* | |
985 | * Allocate and initialize GD structure | |
986 | */ | |
987 | ace->gd = alloc_disk(ACE_NUM_MINORS); | |
988 | if (!ace->gd) | |
989 | goto err_alloc_disk; | |
990 | ||
991 | ace->gd->major = ace_major; | |
992 | ace->gd->first_minor = ace->id * ACE_NUM_MINORS; | |
993 | ace->gd->fops = &ace_fops; | |
994 | ace->gd->queue = ace->queue; | |
995 | ace->gd->private_data = ace; | |
996 | snprintf(ace->gd->disk_name, 32, "xs%c", ace->id + 'a'); | |
997 | ||
998 | /* set bus width */ | |
4a24d861 | 999 | if (ace->bus_width == ACE_BUS_WIDTH_16) { |
74489a91 GL |
1000 | /* 0x0101 should work regardless of endianess */ |
1001 | ace_out_le16(ace, ACE_BUSMODE, 0x0101); | |
1002 | ||
1003 | /* read it back to determine endianess */ | |
1004 | if (ace_in_le16(ace, ACE_BUSMODE) == 0x0001) | |
1005 | ace->reg_ops = &ace_reg_le16_ops; | |
1006 | else | |
1007 | ace->reg_ops = &ace_reg_be16_ops; | |
1008 | } else { | |
1009 | ace_out_8(ace, ACE_BUSMODE, 0x00); | |
1010 | ace->reg_ops = &ace_reg_8_ops; | |
1011 | } | |
1012 | ||
1013 | /* Make sure version register is sane */ | |
1014 | version = ace_in(ace, ACE_VERSION); | |
1015 | if ((version == 0) || (version == 0xFFFF)) | |
1016 | goto err_read; | |
1017 | ||
1018 | /* Put sysace in a sane state by clearing most control reg bits */ | |
1019 | ace_out(ace, ACE_CTRL, ACE_CTRL_FORCECFGMODE | | |
1020 | ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ); | |
1021 | ||
32f6fff4 GL |
1022 | /* Now we can hook up the irq handler */ |
1023 | if (ace->irq != NO_IRQ) { | |
1024 | rc = request_irq(ace->irq, ace_interrupt, 0, "systemace", ace); | |
1025 | if (rc) { | |
1026 | /* Failure - fall back to polled mode */ | |
1027 | dev_err(ace->dev, "request_irq failed\n"); | |
1028 | ace->irq = NO_IRQ; | |
1029 | } | |
1030 | } | |
1031 | ||
d2bbf3da GL |
1032 | /* Enable interrupts */ |
1033 | val = ace_in(ace, ACE_CTRL); | |
1034 | val |= ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ; | |
1035 | ace_out(ace, ACE_CTRL, val); | |
1036 | ||
74489a91 GL |
1037 | /* Print the identification */ |
1038 | dev_info(ace->dev, "Xilinx SystemACE revision %i.%i.%i\n", | |
1039 | (version >> 12) & 0xf, (version >> 8) & 0x0f, version & 0xff); | |
c14464bf YT |
1040 | dev_dbg(ace->dev, "physaddr 0x%llx, mapped to 0x%p, irq=%i\n", |
1041 | (unsigned long long) ace->physaddr, ace->baseaddr, ace->irq); | |
74489a91 GL |
1042 | |
1043 | ace->media_change = 1; | |
1044 | ace_revalidate_disk(ace->gd); | |
1045 | ||
1046 | /* Make the sysace device 'live' */ | |
1047 | add_disk(ace->gd); | |
1048 | ||
1049 | return 0; | |
1050 | ||
ed155a95 | 1051 | err_read: |
74489a91 | 1052 | put_disk(ace->gd); |
ed155a95 | 1053 | err_alloc_disk: |
74489a91 | 1054 | blk_cleanup_queue(ace->queue); |
ed155a95 | 1055 | err_blk_initq: |
74489a91 | 1056 | iounmap(ace->baseaddr); |
ed155a95 | 1057 | err_ioremap: |
c14464bf YT |
1058 | dev_info(ace->dev, "xsysace: error initializing device at 0x%llx\n", |
1059 | (unsigned long long) ace->physaddr); | |
74489a91 GL |
1060 | return -ENOMEM; |
1061 | } | |
1062 | ||
1063 | static void __devexit ace_teardown(struct ace_device *ace) | |
1064 | { | |
1065 | if (ace->gd) { | |
1066 | del_gendisk(ace->gd); | |
1067 | put_disk(ace->gd); | |
1068 | } | |
1069 | ||
1070 | if (ace->queue) | |
1071 | blk_cleanup_queue(ace->queue); | |
1072 | ||
1073 | tasklet_kill(&ace->fsm_tasklet); | |
1074 | ||
1075 | if (ace->irq != NO_IRQ) | |
1076 | free_irq(ace->irq, ace); | |
1077 | ||
1078 | iounmap(ace->baseaddr); | |
1079 | } | |
1080 | ||
1b455466 | 1081 | static int __devinit |
c14464bf | 1082 | ace_alloc(struct device *dev, int id, resource_size_t physaddr, |
1b455466 | 1083 | int irq, int bus_width) |
74489a91 | 1084 | { |
74489a91 | 1085 | struct ace_device *ace; |
1b455466 GL |
1086 | int rc; |
1087 | dev_dbg(dev, "ace_alloc(%p)\n", dev); | |
74489a91 | 1088 | |
1b455466 GL |
1089 | if (!physaddr) { |
1090 | rc = -ENODEV; | |
1091 | goto err_noreg; | |
1092 | } | |
74489a91 | 1093 | |
1b455466 | 1094 | /* Allocate and initialize the ace device structure */ |
74489a91 | 1095 | ace = kzalloc(sizeof(struct ace_device), GFP_KERNEL); |
1b455466 GL |
1096 | if (!ace) { |
1097 | rc = -ENOMEM; | |
74489a91 | 1098 | goto err_alloc; |
74489a91 GL |
1099 | } |
1100 | ||
1b455466 GL |
1101 | ace->dev = dev; |
1102 | ace->id = id; | |
1103 | ace->physaddr = physaddr; | |
1104 | ace->irq = irq; | |
1105 | ace->bus_width = bus_width; | |
74489a91 | 1106 | |
1b455466 | 1107 | /* Call the setup code */ |
34e1b834 GL |
1108 | rc = ace_setup(ace); |
1109 | if (rc) | |
74489a91 GL |
1110 | goto err_setup; |
1111 | ||
1b455466 | 1112 | dev_set_drvdata(dev, ace); |
74489a91 GL |
1113 | return 0; |
1114 | ||
ed155a95 | 1115 | err_setup: |
1b455466 | 1116 | dev_set_drvdata(dev, NULL); |
74489a91 | 1117 | kfree(ace); |
ed155a95 GL |
1118 | err_alloc: |
1119 | err_noreg: | |
1b455466 GL |
1120 | dev_err(dev, "could not initialize device, err=%i\n", rc); |
1121 | return rc; | |
74489a91 GL |
1122 | } |
1123 | ||
1b455466 | 1124 | static void __devexit ace_free(struct device *dev) |
74489a91 | 1125 | { |
1b455466 GL |
1126 | struct ace_device *ace = dev_get_drvdata(dev); |
1127 | dev_dbg(dev, "ace_free(%p)\n", dev); | |
74489a91 GL |
1128 | |
1129 | if (ace) { | |
1130 | ace_teardown(ace); | |
1b455466 | 1131 | dev_set_drvdata(dev, NULL); |
74489a91 GL |
1132 | kfree(ace); |
1133 | } | |
1b455466 GL |
1134 | } |
1135 | ||
1136 | /* --------------------------------------------------------------------- | |
1137 | * Platform Bus Support | |
1138 | */ | |
1139 | ||
1140 | static int __devinit ace_probe(struct platform_device *dev) | |
1141 | { | |
c14464bf | 1142 | resource_size_t physaddr = 0; |
4a24d861 | 1143 | int bus_width = ACE_BUS_WIDTH_16; /* FIXME: should not be hard coded */ |
1b455466 GL |
1144 | int id = dev->id; |
1145 | int irq = NO_IRQ; | |
1146 | int i; | |
1147 | ||
1148 | dev_dbg(&dev->dev, "ace_probe(%p)\n", dev); | |
1149 | ||
1150 | for (i = 0; i < dev->num_resources; i++) { | |
1151 | if (dev->resource[i].flags & IORESOURCE_MEM) | |
1152 | physaddr = dev->resource[i].start; | |
1153 | if (dev->resource[i].flags & IORESOURCE_IRQ) | |
1154 | irq = dev->resource[i].start; | |
1155 | } | |
1156 | ||
1157 | /* Call the bus-independant setup code */ | |
1158 | return ace_alloc(&dev->dev, id, physaddr, irq, bus_width); | |
1159 | } | |
74489a91 | 1160 | |
1b455466 GL |
1161 | /* |
1162 | * Platform bus remove() method | |
1163 | */ | |
1164 | static int __devexit ace_remove(struct platform_device *dev) | |
1165 | { | |
1166 | ace_free(&dev->dev); | |
74489a91 GL |
1167 | return 0; |
1168 | } | |
1169 | ||
edec4961 | 1170 | static struct platform_driver ace_platform_driver = { |
74489a91 GL |
1171 | .probe = ace_probe, |
1172 | .remove = __devexit_p(ace_remove), | |
edec4961 GL |
1173 | .driver = { |
1174 | .owner = THIS_MODULE, | |
1175 | .name = "xsysace", | |
1176 | }, | |
74489a91 GL |
1177 | }; |
1178 | ||
95e896c3 GL |
1179 | /* --------------------------------------------------------------------- |
1180 | * OF_Platform Bus Support | |
1181 | */ | |
1182 | ||
1183 | #if defined(CONFIG_OF) | |
1184 | static int __devinit | |
1185 | ace_of_probe(struct of_device *op, const struct of_device_id *match) | |
1186 | { | |
1187 | struct resource res; | |
c14464bf | 1188 | resource_size_t physaddr; |
95e896c3 GL |
1189 | const u32 *id; |
1190 | int irq, bus_width, rc; | |
1191 | ||
1192 | dev_dbg(&op->dev, "ace_of_probe(%p, %p)\n", op, match); | |
1193 | ||
1194 | /* device id */ | |
1195 | id = of_get_property(op->node, "port-number", NULL); | |
1196 | ||
1197 | /* physaddr */ | |
1198 | rc = of_address_to_resource(op->node, 0, &res); | |
1199 | if (rc) { | |
1200 | dev_err(&op->dev, "invalid address\n"); | |
1201 | return rc; | |
1202 | } | |
1203 | physaddr = res.start; | |
1204 | ||
1205 | /* irq */ | |
1206 | irq = irq_of_parse_and_map(op->node, 0); | |
1207 | ||
1208 | /* bus width */ | |
1209 | bus_width = ACE_BUS_WIDTH_16; | |
1210 | if (of_find_property(op->node, "8-bit", NULL)) | |
1211 | bus_width = ACE_BUS_WIDTH_8; | |
1212 | ||
1213 | /* Call the bus-independant setup code */ | |
1214 | return ace_alloc(&op->dev, id ? *id : 0, physaddr, irq, bus_width); | |
1215 | } | |
1216 | ||
1217 | static int __devexit ace_of_remove(struct of_device *op) | |
1218 | { | |
1219 | ace_free(&op->dev); | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | /* Match table for of_platform binding */ | |
911a3175 | 1224 | static struct of_device_id ace_of_match[] __devinitdata = { |
0e349b0e SN |
1225 | { .compatible = "xlnx,opb-sysace-1.00.b", }, |
1226 | { .compatible = "xlnx,opb-sysace-1.00.c", }, | |
1227 | { .compatible = "xlnx,xps-sysace-1.00.a", }, | |
f5020384 | 1228 | { .compatible = "xlnx,sysace", }, |
95e896c3 GL |
1229 | {}, |
1230 | }; | |
1231 | MODULE_DEVICE_TABLE(of, ace_of_match); | |
1232 | ||
1233 | static struct of_platform_driver ace_of_driver = { | |
1234 | .owner = THIS_MODULE, | |
1235 | .name = "xsysace", | |
1236 | .match_table = ace_of_match, | |
1237 | .probe = ace_of_probe, | |
1238 | .remove = __devexit_p(ace_of_remove), | |
1239 | .driver = { | |
1240 | .name = "xsysace", | |
1241 | }, | |
1242 | }; | |
1243 | ||
1244 | /* Registration helpers to keep the number of #ifdefs to a minimum */ | |
1245 | static inline int __init ace_of_register(void) | |
1246 | { | |
1247 | pr_debug("xsysace: registering OF binding\n"); | |
1248 | return of_register_platform_driver(&ace_of_driver); | |
1249 | } | |
1250 | ||
1251 | static inline void __exit ace_of_unregister(void) | |
1252 | { | |
1253 | of_unregister_platform_driver(&ace_of_driver); | |
1254 | } | |
1255 | #else /* CONFIG_OF */ | |
1256 | /* CONFIG_OF not enabled; do nothing helpers */ | |
1257 | static inline int __init ace_of_register(void) { return 0; } | |
1258 | static inline void __exit ace_of_unregister(void) { } | |
1259 | #endif /* CONFIG_OF */ | |
1260 | ||
74489a91 GL |
1261 | /* --------------------------------------------------------------------- |
1262 | * Module init/exit routines | |
1263 | */ | |
1264 | static int __init ace_init(void) | |
1265 | { | |
edec4961 GL |
1266 | int rc; |
1267 | ||
74489a91 GL |
1268 | ace_major = register_blkdev(ace_major, "xsysace"); |
1269 | if (ace_major <= 0) { | |
edec4961 GL |
1270 | rc = -ENOMEM; |
1271 | goto err_blk; | |
74489a91 GL |
1272 | } |
1273 | ||
34e1b834 GL |
1274 | rc = ace_of_register(); |
1275 | if (rc) | |
95e896c3 GL |
1276 | goto err_of; |
1277 | ||
4a24d861 | 1278 | pr_debug("xsysace: registering platform binding\n"); |
34e1b834 GL |
1279 | rc = platform_driver_register(&ace_platform_driver); |
1280 | if (rc) | |
edec4961 GL |
1281 | goto err_plat; |
1282 | ||
1283 | pr_info("Xilinx SystemACE device driver, major=%i\n", ace_major); | |
1284 | return 0; | |
1285 | ||
ed155a95 | 1286 | err_plat: |
95e896c3 | 1287 | ace_of_unregister(); |
ed155a95 | 1288 | err_of: |
edec4961 | 1289 | unregister_blkdev(ace_major, "xsysace"); |
ed155a95 | 1290 | err_blk: |
edec4961 GL |
1291 | printk(KERN_ERR "xsysace: registration failed; err=%i\n", rc); |
1292 | return rc; | |
74489a91 GL |
1293 | } |
1294 | ||
1295 | static void __exit ace_exit(void) | |
1296 | { | |
1297 | pr_debug("Unregistering Xilinx SystemACE driver\n"); | |
edec4961 | 1298 | platform_driver_unregister(&ace_platform_driver); |
95e896c3 | 1299 | ace_of_unregister(); |
c6d4d634 | 1300 | unregister_blkdev(ace_major, "xsysace"); |
74489a91 GL |
1301 | } |
1302 | ||
1303 | module_init(ace_init); | |
1304 | module_exit(ace_exit); |