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Linux 4.16.11
[linux/fpc-iii.git] / drivers / memstick / host / r592.c
blob627d6e62fe3133319f0da646a0b9f84fc12445d1
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 bool 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 #ifdef CONFIG_PM_SLEEP
192 /* Disable all hardware interrupts */
193 static void r592_clear_interrupts(struct r592_device *dev)
194 {
195 /* Disable & ACK all interrupts */
196 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_ACK_MASK);
197 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_EN_MASK);
198 }
199 #endif
200
201 /* Tests if there is an CRC error */
202 static int r592_test_io_error(struct r592_device *dev)
203 {
204 if (!(r592_read_reg(dev, R592_STATUS) &
205 (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR)))
206 return 0;
207
208 return -EIO;
209 }
210
211 /* Ensure that FIFO is ready for use */
212 static int r592_test_fifo_empty(struct r592_device *dev)
213 {
214 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY)
215 return 0;
216
217 dbg("FIFO not ready, trying to reset the device");
218 r592_host_reset(dev);
219
220 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY)
221 return 0;
222
223 message("FIFO still not ready, giving up");
224 return -EIO;
225 }
226
227 /* Activates the DMA transfer from to FIFO */
228 static void r592_start_dma(struct r592_device *dev, bool is_write)
229 {
230 unsigned long flags;
231 u32 reg;
232 spin_lock_irqsave(&dev->irq_lock, flags);
233
234 /* Ack interrupts (just in case) + enable them */
235 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK);
236 r592_set_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK);
237
238 /* Set DMA address */
239 r592_write_reg(dev, R592_FIFO_DMA, sg_dma_address(&dev->req->sg));
240
241 /* Enable the DMA */
242 reg = r592_read_reg(dev, R592_FIFO_DMA_SETTINGS);
243 reg |= R592_FIFO_DMA_SETTINGS_EN;
244
245 if (!is_write)
246 reg |= R592_FIFO_DMA_SETTINGS_DIR;
247 else
248 reg &= ~R592_FIFO_DMA_SETTINGS_DIR;
249 r592_write_reg(dev, R592_FIFO_DMA_SETTINGS, reg);
250
251 spin_unlock_irqrestore(&dev->irq_lock, flags);
252 }
253
254 /* Cleanups DMA related settings */
255 static void r592_stop_dma(struct r592_device *dev, int error)
256 {
257 r592_clear_reg_mask(dev, R592_FIFO_DMA_SETTINGS,
258 R592_FIFO_DMA_SETTINGS_EN);
259
260 /* This is only a precation */
261 r592_write_reg(dev, R592_FIFO_DMA,
262 dev->dummy_dma_page_physical_address);
263
264 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK);
265 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK);
266 dev->dma_error = error;
267 }
268
269 /* Test if hardware supports DMA */
270 static void r592_check_dma(struct r592_device *dev)
271 {
272 dev->dma_capable = r592_enable_dma &&
273 (r592_read_reg(dev, R592_FIFO_DMA_SETTINGS) &
274 R592_FIFO_DMA_SETTINGS_CAP);
275 }
276
277 /* Transfers fifo contents in/out using DMA */
278 static int r592_transfer_fifo_dma(struct r592_device *dev)
279 {
280 int len, sg_count;
281 bool is_write;
282
283 if (!dev->dma_capable || !dev->req->long_data)
284 return -EINVAL;
285
286 len = dev->req->sg.length;
287 is_write = dev->req->data_dir == WRITE;
288
289 if (len != R592_LFIFO_SIZE)
290 return -EINVAL;
291
292 dbg_verbose("doing dma transfer");
293
294 dev->dma_error = 0;
295 reinit_completion(&dev->dma_done);
296
297 /* TODO: hidden assumption about nenth beeing always 1 */
298 sg_count = dma_map_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ?
299 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
300
301 if (sg_count != 1 || sg_dma_len(&dev->req->sg) < R592_LFIFO_SIZE) {
302 message("problem in dma_map_sg");
303 return -EIO;
304 }
305
306 r592_start_dma(dev, is_write);
307
308 /* Wait for DMA completion */
309 if (!wait_for_completion_timeout(
310 &dev->dma_done, msecs_to_jiffies(1000))) {
311 message("DMA timeout");
312 r592_stop_dma(dev, -ETIMEDOUT);
313 }
314
315 dma_unmap_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ?
316 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
317
318
319 return dev->dma_error;
320 }
321
322 /*
323 * Writes the FIFO in 4 byte chunks.
324 * If length isn't 4 byte aligned, rest of the data if put to a fifo
325 * to be written later
326 * Use r592_flush_fifo_write to flush that fifo when writing for the
327 * last time
328 */
329 static void r592_write_fifo_pio(struct r592_device *dev,
330 unsigned char *buffer, int len)
331 {
332 /* flush spill from former write */
333 if (!kfifo_is_empty(&dev->pio_fifo)) {
334
335 u8 tmp[4] = {0};
336 int copy_len = kfifo_in(&dev->pio_fifo, buffer, len);
337
338 if (!kfifo_is_full(&dev->pio_fifo))
339 return;
340 len -= copy_len;
341 buffer += copy_len;
342
343 copy_len = kfifo_out(&dev->pio_fifo, tmp, 4);
344 WARN_ON(copy_len != 4);
345 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)tmp);
346 }
347
348 WARN_ON(!kfifo_is_empty(&dev->pio_fifo));
349
350 /* write full dwords */
351 while (len >= 4) {
352 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
353 buffer += 4;
354 len -= 4;
355 }
356
357 /* put remaining bytes to the spill */
358 if (len)
359 kfifo_in(&dev->pio_fifo, buffer, len);
360 }
361
362 /* Flushes the temporary FIFO used to make aligned DWORD writes */
363 static void r592_flush_fifo_write(struct r592_device *dev)
364 {
365 u8 buffer[4] = { 0 };
366 int len;
367
368 if (kfifo_is_empty(&dev->pio_fifo))
369 return;
370
371 len = kfifo_out(&dev->pio_fifo, buffer, 4);
372 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
373 }
374
375 /*
376 * Read a fifo in 4 bytes chunks.
377 * If input doesn't fit the buffer, it places bytes of last dword in spill
378 * buffer, so that they don't get lost on last read, just throw these away.
379 */
380 static void r592_read_fifo_pio(struct r592_device *dev,
381 unsigned char *buffer, int len)
382 {
383 u8 tmp[4];
384
385 /* Read from last spill */
386 if (!kfifo_is_empty(&dev->pio_fifo)) {
387 int bytes_copied =
388 kfifo_out(&dev->pio_fifo, buffer, min(4, len));
389 buffer += bytes_copied;
390 len -= bytes_copied;
391
392 if (!kfifo_is_empty(&dev->pio_fifo))
393 return;
394 }
395
396 /* Reads dwords from FIFO */
397 while (len >= 4) {
398 *(u32 *)buffer = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
399 buffer += 4;
400 len -= 4;
401 }
402
403 if (len) {
404 *(u32 *)tmp = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
405 kfifo_in(&dev->pio_fifo, tmp, 4);
406 len -= kfifo_out(&dev->pio_fifo, buffer, len);
407 }
408
409 WARN_ON(len);
410 return;
411 }
412
413 /* Transfers actual data using PIO. */
414 static int r592_transfer_fifo_pio(struct r592_device *dev)
415 {
416 unsigned long flags;
417
418 bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
419 struct sg_mapping_iter miter;
420
421 kfifo_reset(&dev->pio_fifo);
422
423 if (!dev->req->long_data) {
424 if (is_write) {
425 r592_write_fifo_pio(dev, dev->req->data,
426 dev->req->data_len);
427 r592_flush_fifo_write(dev);
428 } else
429 r592_read_fifo_pio(dev, dev->req->data,
430 dev->req->data_len);
431 return 0;
432 }
433
434 local_irq_save(flags);
435 sg_miter_start(&miter, &dev->req->sg, 1, SG_MITER_ATOMIC |
436 (is_write ? SG_MITER_FROM_SG : SG_MITER_TO_SG));
437
438 /* Do the transfer fifo<->memory*/
439 while (sg_miter_next(&miter))
440 if (is_write)
441 r592_write_fifo_pio(dev, miter.addr, miter.length);
442 else
443 r592_read_fifo_pio(dev, miter.addr, miter.length);
444
445
446 /* Write last few non aligned bytes*/
447 if (is_write)
448 r592_flush_fifo_write(dev);
449
450 sg_miter_stop(&miter);
451 local_irq_restore(flags);
452 return 0;
453 }
454
455 /* Executes one TPC (data is read/written from small or large fifo) */
456 static void r592_execute_tpc(struct r592_device *dev)
457 {
458 bool is_write;
459 int len, error;
460 u32 status, reg;
461
462 if (!dev->req) {
463 message("BUG: tpc execution without request!");
464 return;
465 }
466
467 is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
468 len = dev->req->long_data ?
469 dev->req->sg.length : dev->req->data_len;
470
471 /* Ensure that FIFO can hold the input data */
472 if (len > R592_LFIFO_SIZE) {
473 message("IO: hardware doesn't support TPCs longer that 512");
474 error = -ENOSYS;
475 goto out;
476 }
477
478 if (!(r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_PRSNT)) {
479 dbg("IO: refusing to send TPC because card is absent");
480 error = -ENODEV;
481 goto out;
482 }
483
484 dbg("IO: executing %s LEN=%d",
485 memstick_debug_get_tpc_name(dev->req->tpc), len);
486
487 /* Set IO direction */
488 if (is_write)
489 r592_set_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
490 else
491 r592_clear_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
492
493
494 error = r592_test_fifo_empty(dev);
495 if (error)
496 goto out;
497
498 /* Transfer write data */
499 if (is_write) {
500 error = r592_transfer_fifo_dma(dev);
501 if (error == -EINVAL)
502 error = r592_transfer_fifo_pio(dev);
503 }
504
505 if (error)
506 goto out;
507
508 /* Trigger the TPC */
509 reg = (len << R592_TPC_EXEC_LEN_SHIFT) |
510 (dev->req->tpc << R592_TPC_EXEC_TPC_SHIFT) |
511 R592_TPC_EXEC_BIG_FIFO;
512
513 r592_write_reg(dev, R592_TPC_EXEC, reg);
514
515 /* Wait for TPC completion */
516 status = R592_STATUS_RDY;
517 if (dev->req->need_card_int)
518 status |= R592_STATUS_CED;
519
520 error = r592_wait_status(dev, status, status);
521 if (error) {
522 message("card didn't respond");
523 goto out;
524 }
525
526 /* Test IO errors */
527 error = r592_test_io_error(dev);
528 if (error) {
529 dbg("IO error");
530 goto out;
531 }
532
533 /* Read data from FIFO */
534 if (!is_write) {
535 error = r592_transfer_fifo_dma(dev);
536 if (error == -EINVAL)
537 error = r592_transfer_fifo_pio(dev);
538 }
539
540 /* read INT reg. This can be shortened with shifts, but that way
541 its more readable */
542 if (dev->parallel_mode && dev->req->need_card_int) {
543
544 dev->req->int_reg = 0;
545 status = r592_read_reg(dev, R592_STATUS);
546
547 if (status & R592_STATUS_P_CMDNACK)
548 dev->req->int_reg |= MEMSTICK_INT_CMDNAK;
549 if (status & R592_STATUS_P_BREQ)
550 dev->req->int_reg |= MEMSTICK_INT_BREQ;
551 if (status & R592_STATUS_P_INTERR)
552 dev->req->int_reg |= MEMSTICK_INT_ERR;
553 if (status & R592_STATUS_P_CED)
554 dev->req->int_reg |= MEMSTICK_INT_CED;
555 }
556
557 if (error)
558 dbg("FIFO read error");
559 out:
560 dev->req->error = error;
561 r592_clear_reg_mask(dev, R592_REG_MSC, R592_REG_MSC_LED);
562 return;
563 }
564
565 /* Main request processing thread */
566 static int r592_process_thread(void *data)
567 {
568 int error;
569 struct r592_device *dev = (struct r592_device *)data;
570 unsigned long flags;
571
572 while (!kthread_should_stop()) {
573 spin_lock_irqsave(&dev->io_thread_lock, flags);
574 set_current_state(TASK_INTERRUPTIBLE);
575 error = memstick_next_req(dev->host, &dev->req);
576 spin_unlock_irqrestore(&dev->io_thread_lock, flags);
577
578 if (error) {
579 if (error == -ENXIO || error == -EAGAIN) {
580 dbg_verbose("IO: done IO, sleeping");
581 } else {
582 dbg("IO: unknown error from "
583 "memstick_next_req %d", error);
584 }
585
586 if (kthread_should_stop())
587 set_current_state(TASK_RUNNING);
588
589 schedule();
590 } else {
591 set_current_state(TASK_RUNNING);
592 r592_execute_tpc(dev);
593 }
594 }
595 return 0;
596 }
597
598 /* Reprogram chip to detect change in card state */
599 /* eg, if card is detected, arm it to detect removal, and vice versa */
600 static void r592_update_card_detect(struct r592_device *dev)
601 {
602 u32 reg = r592_read_reg(dev, R592_REG_MSC);
603 bool card_detected = reg & R592_REG_MSC_PRSNT;
604
605 dbg("update card detect. card state: %s", card_detected ?
606 "present" : "absent");
607
608 reg &= ~((R592_REG_MSC_IRQ_REMOVE | R592_REG_MSC_IRQ_INSERT) << 16);
609
610 if (card_detected)
611 reg |= (R592_REG_MSC_IRQ_REMOVE << 16);
612 else
613 reg |= (R592_REG_MSC_IRQ_INSERT << 16);
614
615 r592_write_reg(dev, R592_REG_MSC, reg);
616 }
617
618 /* Timer routine that fires 1 second after last card detection event, */
619 static void r592_detect_timer(struct timer_list *t)
620 {
621 struct r592_device *dev = from_timer(dev, t, detect_timer);
622 r592_update_card_detect(dev);
623 memstick_detect_change(dev->host);
624 }
625
626 /* Interrupt handler */
627 static irqreturn_t r592_irq(int irq, void *data)
628 {
629 struct r592_device *dev = (struct r592_device *)data;
630 irqreturn_t ret = IRQ_NONE;
631 u32 reg;
632 u16 irq_enable, irq_status;
633 unsigned long flags;
634 int error;
635
636 spin_lock_irqsave(&dev->irq_lock, flags);
637
638 reg = r592_read_reg(dev, R592_REG_MSC);
639 irq_enable = reg >> 16;
640 irq_status = reg & 0xFFFF;
641
642 /* Ack the interrupts */
643 reg &= ~irq_status;
644 r592_write_reg(dev, R592_REG_MSC, reg);
645
646 /* Get the IRQ status minus bits that aren't enabled */
647 irq_status &= (irq_enable);
648
649 /* Due to limitation of memstick core, we don't look at bits that
650 indicate that card was removed/inserted and/or present */
651 if (irq_status & (R592_REG_MSC_IRQ_INSERT | R592_REG_MSC_IRQ_REMOVE)) {
652
653 bool card_was_added = irq_status & R592_REG_MSC_IRQ_INSERT;
654 ret = IRQ_HANDLED;
655
656 message("IRQ: card %s", card_was_added ? "added" : "removed");
657
658 mod_timer(&dev->detect_timer,
659 jiffies + msecs_to_jiffies(card_was_added ? 500 : 50));
660 }
661
662 if (irq_status &
663 (R592_REG_MSC_FIFO_DMA_DONE | R592_REG_MSC_FIFO_DMA_ERR)) {
664 ret = IRQ_HANDLED;
665
666 if (irq_status & R592_REG_MSC_FIFO_DMA_ERR) {
667 message("IRQ: DMA error");
668 error = -EIO;
669 } else {
670 dbg_verbose("IRQ: dma done");
671 error = 0;
672 }
673
674 r592_stop_dma(dev, error);
675 complete(&dev->dma_done);
676 }
677
678 spin_unlock_irqrestore(&dev->irq_lock, flags);
679 return ret;
680 }
681
682 /* External inteface: set settings */
683 static int r592_set_param(struct memstick_host *host,
684 enum memstick_param param, int value)
685 {
686 struct r592_device *dev = memstick_priv(host);
687
688 switch (param) {
689 case MEMSTICK_POWER:
690 switch (value) {
691 case MEMSTICK_POWER_ON:
692 return r592_enable_device(dev, true);
693 case MEMSTICK_POWER_OFF:
694 return r592_enable_device(dev, false);
695 default:
696 return -EINVAL;
697 }
698 case MEMSTICK_INTERFACE:
699 switch (value) {
700 case MEMSTICK_SERIAL:
701 return r592_set_mode(dev, 0);
702 case MEMSTICK_PAR4:
703 return r592_set_mode(dev, 1);
704 default:
705 return -EINVAL;
706 }
707 default:
708 return -EINVAL;
709 }
710 }
711
712 /* External interface: submit requests */
713 static void r592_submit_req(struct memstick_host *host)
714 {
715 struct r592_device *dev = memstick_priv(host);
716 unsigned long flags;
717
718 if (dev->req)
719 return;
720
721 spin_lock_irqsave(&dev->io_thread_lock, flags);
722 if (wake_up_process(dev->io_thread))
723 dbg_verbose("IO thread woken to process requests");
724 spin_unlock_irqrestore(&dev->io_thread_lock, flags);
725 }
726
727 static const struct pci_device_id r592_pci_id_tbl[] = {
728
729 { PCI_VDEVICE(RICOH, 0x0592), },
730 { },
731 };
732
733 /* Main entry */
734 static int r592_probe(struct pci_dev *pdev, const struct pci_device_id *id)
735 {
736 int error = -ENOMEM;
737 struct memstick_host *host;
738 struct r592_device *dev;
739
740 /* Allocate memory */
741 host = memstick_alloc_host(sizeof(struct r592_device), &pdev->dev);
742 if (!host)
743 goto error1;
744
745 dev = memstick_priv(host);
746 dev->host = host;
747 dev->pci_dev = pdev;
748 pci_set_drvdata(pdev, dev);
749
750 /* pci initialization */
751 error = pci_enable_device(pdev);
752 if (error)
753 goto error2;
754
755 pci_set_master(pdev);
756 error = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
757 if (error)
758 goto error3;
759
760 error = pci_request_regions(pdev, DRV_NAME);
761 if (error)
762 goto error3;
763
764 dev->mmio = pci_ioremap_bar(pdev, 0);
765 if (!dev->mmio)
766 goto error4;
767
768 dev->irq = pdev->irq;
769 spin_lock_init(&dev->irq_lock);
770 spin_lock_init(&dev->io_thread_lock);
771 init_completion(&dev->dma_done);
772 INIT_KFIFO(dev->pio_fifo);
773 timer_setup(&dev->detect_timer, r592_detect_timer, 0);
774
775 /* Host initialization */
776 host->caps = MEMSTICK_CAP_PAR4;
777 host->request = r592_submit_req;
778 host->set_param = r592_set_param;
779 r592_check_dma(dev);
780
781 dev->io_thread = kthread_run(r592_process_thread, dev, "r592_io");
782 if (IS_ERR(dev->io_thread)) {
783 error = PTR_ERR(dev->io_thread);
784 goto error5;
785 }
786
787 /* This is just a precation, so don't fail */
788 dev->dummy_dma_page = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
789 &dev->dummy_dma_page_physical_address, GFP_KERNEL);
790 r592_stop_dma(dev , 0);
791
792 if (request_irq(dev->irq, &r592_irq, IRQF_SHARED,
793 DRV_NAME, dev))
794 goto error6;
795
796 r592_update_card_detect(dev);
797 if (memstick_add_host(host))
798 goto error7;
799
800 message("driver successfully loaded");
801 return 0;
802 error7:
803 free_irq(dev->irq, dev);
804 error6:
805 if (dev->dummy_dma_page)
806 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->dummy_dma_page,
807 dev->dummy_dma_page_physical_address);
808
809 kthread_stop(dev->io_thread);
810 error5:
811 iounmap(dev->mmio);
812 error4:
813 pci_release_regions(pdev);
814 error3:
815 pci_disable_device(pdev);
816 error2:
817 memstick_free_host(host);
818 error1:
819 return error;
820 }
821
822 static void r592_remove(struct pci_dev *pdev)
823 {
824 int error = 0;
825 struct r592_device *dev = pci_get_drvdata(pdev);
826
827 /* Stop the processing thread.
828 That ensures that we won't take any more requests */
829 kthread_stop(dev->io_thread);
830
831 r592_enable_device(dev, false);
832
833 while (!error && dev->req) {
834 dev->req->error = -ETIME;
835 error = memstick_next_req(dev->host, &dev->req);
836 }
837 memstick_remove_host(dev->host);
838
839 free_irq(dev->irq, dev);
840 iounmap(dev->mmio);
841 pci_release_regions(pdev);
842 pci_disable_device(pdev);
843 memstick_free_host(dev->host);
844
845 if (dev->dummy_dma_page)
846 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->dummy_dma_page,
847 dev->dummy_dma_page_physical_address);
848 }
849
850 #ifdef CONFIG_PM_SLEEP
851 static int r592_suspend(struct device *core_dev)
852 {
853 struct pci_dev *pdev = to_pci_dev(core_dev);
854 struct r592_device *dev = pci_get_drvdata(pdev);
855
856 r592_clear_interrupts(dev);
857 memstick_suspend_host(dev->host);
858 del_timer_sync(&dev->detect_timer);
859 return 0;
860 }
861
862 static int r592_resume(struct device *core_dev)
863 {
864 struct pci_dev *pdev = to_pci_dev(core_dev);
865 struct r592_device *dev = pci_get_drvdata(pdev);
866
867 r592_clear_interrupts(dev);
868 r592_enable_device(dev, false);
869 memstick_resume_host(dev->host);
870 r592_update_card_detect(dev);
871 return 0;
872 }
873 #endif
874
875 static SIMPLE_DEV_PM_OPS(r592_pm_ops, r592_suspend, r592_resume);
876
877 MODULE_DEVICE_TABLE(pci, r592_pci_id_tbl);
878
879 static struct pci_driver r852_pci_driver = {
880 .name = DRV_NAME,
881 .id_table = r592_pci_id_tbl,
882 .probe = r592_probe,
883 .remove = r592_remove,
884 .driver.pm = &r592_pm_ops,
885 };
886
887 module_pci_driver(r852_pci_driver);
888
889 module_param_named(enable_dma, r592_enable_dma, bool, S_IRUGO);
890 MODULE_PARM_DESC(enable_dma, "Enable usage of the DMA (default)");
891 module_param(debug, int, S_IRUGO | S_IWUSR);
892 MODULE_PARM_DESC(debug, "Debug level (0-3)");
893
894 MODULE_LICENSE("GPL");
895 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
896 MODULE_DESCRIPTION("Ricoh R5C592 Memstick/Memstick PRO card reader driver");
Linux with added FPC-III support