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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / memstick / host / r592.c
blob668f5c6a0399f932743cbf16a8c03f1264c78b50
1 /*
2 * Copyright (C) 2010 - Maxim Levitsky
3 * driver for Ricoh memstick readers
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/freezer.h>
13 #include <linux/jiffies.h>
14 #include <linux/interrupt.h>
15 #include <linux/pci.h>
16 #include <linux/pci_ids.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
19 #include <linux/kthread.h>
20 #include <linux/sched.h>
21 #include <linux/highmem.h>
22 #include <asm/byteorder.h>
23 #include <linux/swab.h>
24 #include "r592.h"
25
26 static int r592_enable_dma = 1;
27 static int debug;
28
29 static const char *tpc_names[] = {
30 "MS_TPC_READ_MG_STATUS",
31 "MS_TPC_READ_LONG_DATA",
32 "MS_TPC_READ_SHORT_DATA",
33 "MS_TPC_READ_REG",
34 "MS_TPC_READ_QUAD_DATA",
35 "INVALID",
36 "MS_TPC_GET_INT",
37 "MS_TPC_SET_RW_REG_ADRS",
38 "MS_TPC_EX_SET_CMD",
39 "MS_TPC_WRITE_QUAD_DATA",
40 "MS_TPC_WRITE_REG",
41 "MS_TPC_WRITE_SHORT_DATA",
42 "MS_TPC_WRITE_LONG_DATA",
43 "MS_TPC_SET_CMD",
44 };
45
46 /**
47 * memstick_debug_get_tpc_name - debug helper that returns string for
48 * a TPC number
49 */
50 const char *memstick_debug_get_tpc_name(int tpc)
51 {
52 return tpc_names[tpc-1];
53 }
54 EXPORT_SYMBOL(memstick_debug_get_tpc_name);
55
56
57 /* Read a register*/
58 static inline u32 r592_read_reg(struct r592_device *dev, int address)
59 {
60 u32 value = readl(dev->mmio + address);
61 dbg_reg("reg #%02d == 0x%08x", address, value);
62 return value;
63 }
64
65 /* Write a register */
66 static inline void r592_write_reg(struct r592_device *dev,
67 int address, u32 value)
68 {
69 dbg_reg("reg #%02d <- 0x%08x", address, value);
70 writel(value, dev->mmio + address);
71 }
72
73 /* Reads a big endian DWORD register */
74 static inline u32 r592_read_reg_raw_be(struct r592_device *dev, int address)
75 {
76 u32 value = __raw_readl(dev->mmio + address);
77 dbg_reg("reg #%02d == 0x%08x", address, value);
78 return be32_to_cpu(value);
79 }
80
81 /* Writes a big endian DWORD register */
82 static inline void r592_write_reg_raw_be(struct r592_device *dev,
83 int address, u32 value)
84 {
85 dbg_reg("reg #%02d <- 0x%08x", address, value);
86 __raw_writel(cpu_to_be32(value), dev->mmio + address);
87 }
88
89 /* Set specific bits in a register (little endian) */
90 static inline void r592_set_reg_mask(struct r592_device *dev,
91 int address, u32 mask)
92 {
93 u32 reg = readl(dev->mmio + address);
94 dbg_reg("reg #%02d |= 0x%08x (old =0x%08x)", address, mask, reg);
95 writel(reg | mask , dev->mmio + address);
96 }
97
98 /* Clear specific bits in a register (little endian) */
99 static inline void r592_clear_reg_mask(struct r592_device *dev,
100 int address, u32 mask)
101 {
102 u32 reg = readl(dev->mmio + address);
103 dbg_reg("reg #%02d &= 0x%08x (old = 0x%08x, mask = 0x%08x)",
104 address, ~mask, reg, mask);
105 writel(reg & ~mask, dev->mmio + address);
106 }
107
108
109 /* Wait for status bits while checking for errors */
110 static int r592_wait_status(struct r592_device *dev, u32 mask, u32 wanted_mask)
111 {
112 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
113 u32 reg = r592_read_reg(dev, R592_STATUS);
114
115 if ((reg & mask) == wanted_mask)
116 return 0;
117
118 while (time_before(jiffies, timeout)) {
119
120 reg = r592_read_reg(dev, R592_STATUS);
121
122 if ((reg & mask) == wanted_mask)
123 return 0;
124
125 if (reg & (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR))
126 return -EIO;
127
128 cpu_relax();
129 }
130 return -ETIME;
131 }
132
133
134 /* Enable/disable device */
135 static int r592_enable_device(struct r592_device *dev, bool enable)
136 {
137 dbg("%sabling the device", enable ? "en" : "dis");
138
139 if (enable) {
140
141 /* Power up the card */
142 r592_write_reg(dev, R592_POWER, R592_POWER_0 | R592_POWER_1);
143
144 /* Perform a reset */
145 r592_set_reg_mask(dev, R592_IO, R592_IO_RESET);
146
147 msleep(100);
148 } else
149 /* Power down the card */
150 r592_write_reg(dev, R592_POWER, 0);
151
152 return 0;
153 }
154
155 /* Set serial/parallel mode */
156 static int r592_set_mode(struct r592_device *dev, bool parallel_mode)
157 {
158 if (!parallel_mode) {
159 dbg("switching to serial mode");
160
161 /* Set serial mode */
162 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_SERIAL);
163
164 r592_clear_reg_mask(dev, R592_POWER, R592_POWER_20);
165
166 } else {
167 dbg("switching to parallel mode");
168
169 /* This setting should be set _before_ switch TPC */
170 r592_set_reg_mask(dev, R592_POWER, R592_POWER_20);
171
172 r592_clear_reg_mask(dev, R592_IO,
173 R592_IO_SERIAL1 | R592_IO_SERIAL2);
174
175 /* Set the parallel mode now */
176 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_PARALLEL);
177 }
178
179 dev->parallel_mode = parallel_mode;
180 return 0;
181 }
182
183 /* Perform a controller reset without powering down the card */
184 static void r592_host_reset(struct r592_device *dev)
185 {
186 r592_set_reg_mask(dev, R592_IO, R592_IO_RESET);
187 msleep(100);
188 r592_set_mode(dev, dev->parallel_mode);
189 }
190
191 /* Disable all hardware interrupts */
192 static void r592_clear_interrupts(struct r592_device *dev)
193 {
194 /* Disable & ACK all interrupts */
195 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_ACK_MASK);
196 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_EN_MASK);
197 }
198
199 /* Tests if there is an CRC error */
200 static int r592_test_io_error(struct r592_device *dev)
201 {
202 if (!(r592_read_reg(dev, R592_STATUS) &
203 (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR)))
204 return 0;
205
206 return -EIO;
207 }
208
209 /* Ensure that FIFO is ready for use */
210 static int r592_test_fifo_empty(struct r592_device *dev)
211 {
212 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY)
213 return 0;
214
215 dbg("FIFO not ready, trying to reset the device");
216 r592_host_reset(dev);
217
218 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY)
219 return 0;
220
221 message("FIFO still not ready, giving up");
222 return -EIO;
223 }
224
225 /* Activates the DMA transfer from to FIFO */
226 static void r592_start_dma(struct r592_device *dev, bool is_write)
227 {
228 unsigned long flags;
229 u32 reg;
230 spin_lock_irqsave(&dev->irq_lock, flags);
231
232 /* Ack interrupts (just in case) + enable them */
233 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK);
234 r592_set_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK);
235
236 /* Set DMA address */
237 r592_write_reg(dev, R592_FIFO_DMA, sg_dma_address(&dev->req->sg));
238
239 /* Enable the DMA */
240 reg = r592_read_reg(dev, R592_FIFO_DMA_SETTINGS);
241 reg |= R592_FIFO_DMA_SETTINGS_EN;
242
243 if (!is_write)
244 reg |= R592_FIFO_DMA_SETTINGS_DIR;
245 else
246 reg &= ~R592_FIFO_DMA_SETTINGS_DIR;
247 r592_write_reg(dev, R592_FIFO_DMA_SETTINGS, reg);
248
249 spin_unlock_irqrestore(&dev->irq_lock, flags);
250 }
251
252 /* Cleanups DMA related settings */
253 static void r592_stop_dma(struct r592_device *dev, int error)
254 {
255 r592_clear_reg_mask(dev, R592_FIFO_DMA_SETTINGS,
256 R592_FIFO_DMA_SETTINGS_EN);
257
258 /* This is only a precation */
259 r592_write_reg(dev, R592_FIFO_DMA,
260 dev->dummy_dma_page_physical_address);
261
262 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK);
263 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK);
264 dev->dma_error = error;
265 }
266
267 /* Test if hardware supports DMA */
268 static void r592_check_dma(struct r592_device *dev)
269 {
270 dev->dma_capable = r592_enable_dma &&
271 (r592_read_reg(dev, R592_FIFO_DMA_SETTINGS) &
272 R592_FIFO_DMA_SETTINGS_CAP);
273 }
274
275 /* Transfers fifo contents in/out using DMA */
276 static int r592_transfer_fifo_dma(struct r592_device *dev)
277 {
278 int len, sg_count;
279 bool is_write;
280
281 if (!dev->dma_capable || !dev->req->long_data)
282 return -EINVAL;
283
284 len = dev->req->sg.length;
285 is_write = dev->req->data_dir == WRITE;
286
287 if (len != R592_LFIFO_SIZE)
288 return -EINVAL;
289
290 dbg_verbose("doing dma transfer");
291
292 dev->dma_error = 0;
293 INIT_COMPLETION(dev->dma_done);
294
295 /* TODO: hidden assumption about nenth beeing always 1 */
296 sg_count = dma_map_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ?
297 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
298
299 if (sg_count != 1 ||
300 (sg_dma_len(&dev->req->sg) < dev->req->sg.length)) {
301 message("problem in dma_map_sg");
302 return -EIO;
303 }
304
305 r592_start_dma(dev, is_write);
306
307 /* Wait for DMA completion */
308 if (!wait_for_completion_timeout(
309 &dev->dma_done, msecs_to_jiffies(1000))) {
310 message("DMA timeout");
311 r592_stop_dma(dev, -ETIMEDOUT);
312 }
313
314 dma_unmap_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ?
315 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
316
317
318 return dev->dma_error;
319 }
320
321 /*
322 * Writes the FIFO in 4 byte chunks.
323 * If length isn't 4 byte aligned, rest of the data if put to a fifo
324 * to be written later
325 * Use r592_flush_fifo_write to flush that fifo when writing for the
326 * last time
327 */
328 static void r592_write_fifo_pio(struct r592_device *dev,
329 unsigned char *buffer, int len)
330 {
331 /* flush spill from former write */
332 if (!kfifo_is_empty(&dev->pio_fifo)) {
333
334 u8 tmp[4] = {0};
335 int copy_len = kfifo_in(&dev->pio_fifo, buffer, len);
336
337 if (!kfifo_is_full(&dev->pio_fifo))
338 return;
339 len -= copy_len;
340 buffer += copy_len;
341
342 copy_len = kfifo_out(&dev->pio_fifo, tmp, 4);
343 WARN_ON(copy_len != 4);
344 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)tmp);
345 }
346
347 WARN_ON(!kfifo_is_empty(&dev->pio_fifo));
348
349 /* write full dwords */
350 while (len >= 4) {
351 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
352 buffer += 4;
353 len -= 4;
354 }
355
356 /* put remaining bytes to the spill */
357 if (len)
358 kfifo_in(&dev->pio_fifo, buffer, len);
359 }
360
361 /* Flushes the temporary FIFO used to make aligned DWORD writes */
362 static void r592_flush_fifo_write(struct r592_device *dev)
363 {
364 u8 buffer[4] = { 0 };
365 int len;
366
367 if (kfifo_is_empty(&dev->pio_fifo))
368 return;
369
370 len = kfifo_out(&dev->pio_fifo, buffer, 4);
371 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
372 }
373
374 /*
375 * Read a fifo in 4 bytes chunks.
376 * If input doesn't fit the buffer, it places bytes of last dword in spill
377 * buffer, so that they don't get lost on last read, just throw these away.
378 */
379 static void r592_read_fifo_pio(struct r592_device *dev,
380 unsigned char *buffer, int len)
381 {
382 u8 tmp[4];
383
384 /* Read from last spill */
385 if (!kfifo_is_empty(&dev->pio_fifo)) {
386 int bytes_copied =
387 kfifo_out(&dev->pio_fifo, buffer, min(4, len));
388 buffer += bytes_copied;
389 len -= bytes_copied;
390
391 if (!kfifo_is_empty(&dev->pio_fifo))
392 return;
393 }
394
395 /* Reads dwords from FIFO */
396 while (len >= 4) {
397 *(u32 *)buffer = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
398 buffer += 4;
399 len -= 4;
400 }
401
402 if (len) {
403 *(u32 *)tmp = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
404 kfifo_in(&dev->pio_fifo, tmp, 4);
405 len -= kfifo_out(&dev->pio_fifo, buffer, len);
406 }
407
408 WARN_ON(len);
409 return;
410 }
411
412 /* Transfers actual data using PIO. */
413 static int r592_transfer_fifo_pio(struct r592_device *dev)
414 {
415 unsigned long flags;
416
417 bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
418 struct sg_mapping_iter miter;
419
420 kfifo_reset(&dev->pio_fifo);
421
422 if (!dev->req->long_data) {
423 if (is_write) {
424 r592_write_fifo_pio(dev, dev->req->data,
425 dev->req->data_len);
426 r592_flush_fifo_write(dev);
427 } else
428 r592_read_fifo_pio(dev, dev->req->data,
429 dev->req->data_len);
430 return 0;
431 }
432
433 local_irq_save(flags);
434 sg_miter_start(&miter, &dev->req->sg, 1, SG_MITER_ATOMIC |
435 (is_write ? SG_MITER_FROM_SG : SG_MITER_TO_SG));
436
437 /* Do the transfer fifo<->memory*/
438 while (sg_miter_next(&miter))
439 if (is_write)
440 r592_write_fifo_pio(dev, miter.addr, miter.length);
441 else
442 r592_read_fifo_pio(dev, miter.addr, miter.length);
443
444
445 /* Write last few non aligned bytes*/
446 if (is_write)
447 r592_flush_fifo_write(dev);
448
449 sg_miter_stop(&miter);
450 local_irq_restore(flags);
451 return 0;
452 }
453
454 /* Executes one TPC (data is read/written from small or large fifo) */
455 static void r592_execute_tpc(struct r592_device *dev)
456 {
457 bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
458 int len, error;
459 u32 status, reg;
460
461 if (!dev->req) {
462 message("BUG: tpc execution without request!");
463 return;
464 }
465
466 len = dev->req->long_data ?
467 dev->req->sg.length : dev->req->data_len;
468
469 /* Ensure that FIFO can hold the input data */
470 if (len > R592_LFIFO_SIZE) {
471 message("IO: hardware doesn't support TPCs longer that 512");
472 error = -ENOSYS;
473 goto out;
474 }
475
476 if (!(r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_PRSNT)) {
477 dbg("IO: refusing to send TPC because card is absent");
478 error = -ENODEV;
479 goto out;
480 }
481
482 dbg("IO: executing %s LEN=%d",
483 memstick_debug_get_tpc_name(dev->req->tpc), len);
484
485 /* Set IO direction */
486 if (is_write)
487 r592_set_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
488 else
489 r592_clear_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
490
491
492 error = r592_test_fifo_empty(dev);
493 if (error)
494 goto out;
495
496 /* Transfer write data */
497 if (is_write) {
498 error = r592_transfer_fifo_dma(dev);
499 if (error == -EINVAL)
500 error = r592_transfer_fifo_pio(dev);
501 }
502
503 if (error)
504 goto out;
505
506 /* Trigger the TPC */
507 reg = (len << R592_TPC_EXEC_LEN_SHIFT) |
508 (dev->req->tpc << R592_TPC_EXEC_TPC_SHIFT) |
509 R592_TPC_EXEC_BIG_FIFO;
510
511 r592_write_reg(dev, R592_TPC_EXEC, reg);
512
513 /* Wait for TPC completion */
514 status = R592_STATUS_RDY;
515 if (dev->req->need_card_int)
516 status |= R592_STATUS_CED;
517
518 error = r592_wait_status(dev, status, status);
519 if (error) {
520 message("card didn't respond");
521 goto out;
522 }
523
524 /* Test IO errors */
525 error = r592_test_io_error(dev);
526 if (error) {
527 dbg("IO error");
528 goto out;
529 }
530
531 /* Read data from FIFO */
532 if (!is_write) {
533 error = r592_transfer_fifo_dma(dev);
534 if (error == -EINVAL)
535 error = r592_transfer_fifo_pio(dev);
536 }
537
538 /* read INT reg. This can be shortened with shifts, but that way
539 its more readable */
540 if (dev->parallel_mode && dev->req->need_card_int) {
541
542 dev->req->int_reg = 0;
543 status = r592_read_reg(dev, R592_STATUS);
544
545 if (status & R592_STATUS_P_CMDNACK)
546 dev->req->int_reg |= MEMSTICK_INT_CMDNAK;
547 if (status & R592_STATUS_P_BREQ)
548 dev->req->int_reg |= MEMSTICK_INT_BREQ;
549 if (status & R592_STATUS_P_INTERR)
550 dev->req->int_reg |= MEMSTICK_INT_ERR;
551 if (status & R592_STATUS_P_CED)
552 dev->req->int_reg |= MEMSTICK_INT_CED;
553 }
554
555 if (error)
556 dbg("FIFO read error");
557 out:
558 dev->req->error = error;
559 r592_clear_reg_mask(dev, R592_REG_MSC, R592_REG_MSC_LED);
560 return;
561 }
562
563 /* Main request processing thread */
564 static int r592_process_thread(void *data)
565 {
566 int error;
567 struct r592_device *dev = (struct r592_device *)data;
568 unsigned long flags;
569
570 while (!kthread_should_stop()) {
571 spin_lock_irqsave(&dev->io_thread_lock, flags);
572 set_current_state(TASK_INTERRUPTIBLE);
573 error = memstick_next_req(dev->host, &dev->req);
574 spin_unlock_irqrestore(&dev->io_thread_lock, flags);
575
576 if (error) {
577 if (error == -ENXIO || error == -EAGAIN) {
578 dbg_verbose("IO: done IO, sleeping");
579 } else {
580 dbg("IO: unknown error from "
581 "memstick_next_req %d", error);
582 }
583
584 if (kthread_should_stop())
585 set_current_state(TASK_RUNNING);
586
587 schedule();
588 } else {
589 set_current_state(TASK_RUNNING);
590 r592_execute_tpc(dev);
591 }
592 }
593 return 0;
594 }
595
596 /* Reprogram chip to detect change in card state */
597 /* eg, if card is detected, arm it to detect removal, and vice versa */
598 static void r592_update_card_detect(struct r592_device *dev)
599 {
600 u32 reg = r592_read_reg(dev, R592_REG_MSC);
601 bool card_detected = reg & R592_REG_MSC_PRSNT;
602
603 dbg("update card detect. card state: %s", card_detected ?
604 "present" : "absent");
605
606 reg &= ~((R592_REG_MSC_IRQ_REMOVE | R592_REG_MSC_IRQ_INSERT) << 16);
607
608 if (card_detected)
609 reg |= (R592_REG_MSC_IRQ_REMOVE << 16);
610 else
611 reg |= (R592_REG_MSC_IRQ_INSERT << 16);
612
613 r592_write_reg(dev, R592_REG_MSC, reg);
614 }
615
616 /* Timer routine that fires 1 second after last card detection event, */
617 static void r592_detect_timer(long unsigned int data)
618 {
619 struct r592_device *dev = (struct r592_device *)data;
620 r592_update_card_detect(dev);
621 memstick_detect_change(dev->host);
622 }
623
624 /* Interrupt handler */
625 static irqreturn_t r592_irq(int irq, void *data)
626 {
627 struct r592_device *dev = (struct r592_device *)data;
628 irqreturn_t ret = IRQ_NONE;
629 u32 reg;
630 u16 irq_enable, irq_status;
631 unsigned long flags;
632 int error;
633
634 spin_lock_irqsave(&dev->irq_lock, flags);
635
636 reg = r592_read_reg(dev, R592_REG_MSC);
637 irq_enable = reg >> 16;
638 irq_status = reg & 0xFFFF;
639
640 /* Ack the interrupts */
641 reg &= ~irq_status;
642 r592_write_reg(dev, R592_REG_MSC, reg);
643
644 /* Get the IRQ status minus bits that aren't enabled */
645 irq_status &= (irq_enable);
646
647 /* Due to limitation of memstick core, we don't look at bits that
648 indicate that card was removed/inserted and/or present */
649 if (irq_status & (R592_REG_MSC_IRQ_INSERT | R592_REG_MSC_IRQ_REMOVE)) {
650
651 bool card_was_added = irq_status & R592_REG_MSC_IRQ_INSERT;
652 ret = IRQ_HANDLED;
653
654 message("IRQ: card %s", card_was_added ? "added" : "removed");
655
656 mod_timer(&dev->detect_timer,
657 jiffies + msecs_to_jiffies(card_was_added ? 500 : 50));
658 }
659
660 if (irq_status &
661 (R592_REG_MSC_FIFO_DMA_DONE | R592_REG_MSC_FIFO_DMA_ERR)) {
662 ret = IRQ_HANDLED;
663
664 if (irq_status & R592_REG_MSC_FIFO_DMA_ERR) {
665 message("IRQ: DMA error");
666 error = -EIO;
667 } else {
668 dbg_verbose("IRQ: dma done");
669 error = 0;
670 }
671
672 r592_stop_dma(dev, error);
673 complete(&dev->dma_done);
674 }
675
676 spin_unlock_irqrestore(&dev->irq_lock, flags);
677 return ret;
678 }
679
680 /* External inteface: set settings */
681 static int r592_set_param(struct memstick_host *host,
682 enum memstick_param param, int value)
683 {
684 struct r592_device *dev = memstick_priv(host);
685
686 switch (param) {
687 case MEMSTICK_POWER:
688 switch (value) {
689 case MEMSTICK_POWER_ON:
690 return r592_enable_device(dev, true);
691 case MEMSTICK_POWER_OFF:
692 return r592_enable_device(dev, false);
693 default:
694 return -EINVAL;
695 }
696 case MEMSTICK_INTERFACE:
697 switch (value) {
698 case MEMSTICK_SERIAL:
699 return r592_set_mode(dev, 0);
700 case MEMSTICK_PAR4:
701 return r592_set_mode(dev, 1);
702 default:
703 return -EINVAL;
704 }
705 default:
706 return -EINVAL;
707 }
708 }
709
710 /* External interface: submit requests */
711 static void r592_submit_req(struct memstick_host *host)
712 {
713 struct r592_device *dev = memstick_priv(host);
714 unsigned long flags;
715
716 if (dev->req)
717 return;
718
719 spin_lock_irqsave(&dev->io_thread_lock, flags);
720 if (wake_up_process(dev->io_thread))
721 dbg_verbose("IO thread woken to process requests");
722 spin_unlock_irqrestore(&dev->io_thread_lock, flags);
723 }
724
725 static const struct pci_device_id r592_pci_id_tbl[] = {
726
727 { PCI_VDEVICE(RICOH, 0x0592), },
728 { },
729 };
730
731 /* Main entry */
732 static int r592_probe(struct pci_dev *pdev, const struct pci_device_id *id)
733 {
734 int error = -ENOMEM;
735 struct memstick_host *host;
736 struct r592_device *dev;
737
738 /* Allocate memory */
739 host = memstick_alloc_host(sizeof(struct r592_device), &pdev->dev);
740 if (!host)
741 goto error1;
742
743 dev = memstick_priv(host);
744 dev->host = host;
745 dev->pci_dev = pdev;
746 pci_set_drvdata(pdev, dev);
747
748 /* pci initialization */
749 error = pci_enable_device(pdev);
750 if (error)
751 goto error2;
752
753 pci_set_master(pdev);
754 error = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
755 if (error)
756 goto error3;
757
758 error = pci_request_regions(pdev, DRV_NAME);
759 if (error)
760 goto error3;
761
762 dev->mmio = pci_ioremap_bar(pdev, 0);
763 if (!dev->mmio)
764 goto error4;
765
766 dev->irq = pdev->irq;
767 spin_lock_init(&dev->irq_lock);
768 spin_lock_init(&dev->io_thread_lock);
769 init_completion(&dev->dma_done);
770 INIT_KFIFO(dev->pio_fifo);
771 setup_timer(&dev->detect_timer,
772 r592_detect_timer, (long unsigned int)dev);
773
774 /* Host initialization */
775 host->caps = MEMSTICK_CAP_PAR4;
776 host->request = r592_submit_req;
777 host->set_param = r592_set_param;
778 r592_check_dma(dev);
779
780 dev->io_thread = kthread_run(r592_process_thread, dev, "r592_io");
781 if (IS_ERR(dev->io_thread)) {
782 error = PTR_ERR(dev->io_thread);
783 goto error5;
784 }
785
786 /* This is just a precation, so don't fail */
787 dev->dummy_dma_page = pci_alloc_consistent(pdev, PAGE_SIZE,
788 &dev->dummy_dma_page_physical_address);
789 r592_stop_dma(dev , 0);
790
791 if (request_irq(dev->irq, &r592_irq, IRQF_SHARED,
792 DRV_NAME, dev))
793 goto error6;
794
795 r592_update_card_detect(dev);
796 if (memstick_add_host(host))
797 goto error7;
798
799 message("driver successfully loaded");
800 return 0;
801 error7:
802 free_irq(dev->irq, dev);
803 error6:
804 if (dev->dummy_dma_page)
805 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page,
806 dev->dummy_dma_page_physical_address);
807
808 kthread_stop(dev->io_thread);
809 error5:
810 iounmap(dev->mmio);
811 error4:
812 pci_release_regions(pdev);
813 error3:
814 pci_disable_device(pdev);
815 error2:
816 memstick_free_host(host);
817 error1:
818 return error;
819 }
820
821 static void r592_remove(struct pci_dev *pdev)
822 {
823 int error = 0;
824 struct r592_device *dev = pci_get_drvdata(pdev);
825
826 /* Stop the processing thread.
827 That ensures that we won't take any more requests */
828 kthread_stop(dev->io_thread);
829
830 r592_enable_device(dev, false);
831
832 while (!error && dev->req) {
833 dev->req->error = -ETIME;
834 error = memstick_next_req(dev->host, &dev->req);
835 }
836 memstick_remove_host(dev->host);
837
838 free_irq(dev->irq, dev);
839 iounmap(dev->mmio);
840 pci_release_regions(pdev);
841 pci_disable_device(pdev);
842 memstick_free_host(dev->host);
843
844 if (dev->dummy_dma_page)
845 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page,
846 dev->dummy_dma_page_physical_address);
847 }
848
849 #ifdef CONFIG_PM
850 static int r592_suspend(struct device *core_dev)
851 {
852 struct pci_dev *pdev = to_pci_dev(core_dev);
853 struct r592_device *dev = pci_get_drvdata(pdev);
854
855 r592_clear_interrupts(dev);
856 memstick_suspend_host(dev->host);
857 del_timer_sync(&dev->detect_timer);
858 return 0;
859 }
860
861 static int r592_resume(struct device *core_dev)
862 {
863 struct pci_dev *pdev = to_pci_dev(core_dev);
864 struct r592_device *dev = pci_get_drvdata(pdev);
865
866 r592_clear_interrupts(dev);
867 r592_enable_device(dev, false);
868 memstick_resume_host(dev->host);
869 r592_update_card_detect(dev);
870 return 0;
871 }
872
873 SIMPLE_DEV_PM_OPS(r592_pm_ops, r592_suspend, r592_resume);
874 #endif
875
876 MODULE_DEVICE_TABLE(pci, r592_pci_id_tbl);
877
878 static struct pci_driver r852_pci_driver = {
879 .name = DRV_NAME,
880 .id_table = r592_pci_id_tbl,
881 .probe = r592_probe,
882 .remove = r592_remove,
883 #ifdef CONFIG_PM
884 .driver.pm = &r592_pm_ops,
885 #endif
886 };
887
888 static __init int r592_module_init(void)
889 {
890 return pci_register_driver(&r852_pci_driver);
891 }
892
893 static void __exit r592_module_exit(void)
894 {
895 pci_unregister_driver(&r852_pci_driver);
896 }
897
898 module_init(r592_module_init);
899 module_exit(r592_module_exit);
900
901 module_param_named(enable_dma, r592_enable_dma, bool, S_IRUGO);
902 MODULE_PARM_DESC(enable_dma, "Enable usage of the DMA (default)");
903 module_param(debug, int, S_IRUGO | S_IWUSR);
904 MODULE_PARM_DESC(debug, "Debug level (0-3)");
905
906 MODULE_LICENSE("GPL");
907 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
908 MODULE_DESCRIPTION("Ricoh R5C592 Memstick/Memstick PRO card reader driver");
linux-next