Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/memstick/host/r592.c

  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 /* 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         reinit_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;
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         is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
467         len = dev->req->long_data ?
468                 dev->req->sg.length : dev->req->data_len;
469 
470         /* Ensure that FIFO can hold the input data */
471         if (len > R592_LFIFO_SIZE) {
472                 message("IO: hardware doesn't support TPCs longer that 512");
473                 error = -ENOSYS;
474                 goto out;
475         }
476 
477         if (!(r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_PRSNT)) {
478                 dbg("IO: refusing to send TPC because card is absent");
479                 error = -ENODEV;
480                 goto out;
481         }
482 
483         dbg("IO: executing %s LEN=%d",
484                         memstick_debug_get_tpc_name(dev->req->tpc), len);
485 
486         /* Set IO direction */
487         if (is_write)
488                 r592_set_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
489         else
490                 r592_clear_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
491 
492 
493         error = r592_test_fifo_empty(dev);
494         if (error)
495                 goto out;
496 
497         /* Transfer write data */
498         if (is_write) {
499                 error = r592_transfer_fifo_dma(dev);
500                 if (error == -EINVAL)
501                         error = r592_transfer_fifo_pio(dev);
502         }
503 
504         if (error)
505                 goto out;
506 
507         /* Trigger the TPC */
508         reg = (len << R592_TPC_EXEC_LEN_SHIFT) |
509                 (dev->req->tpc << R592_TPC_EXEC_TPC_SHIFT) |
510                         R592_TPC_EXEC_BIG_FIFO;
511 
512         r592_write_reg(dev, R592_TPC_EXEC, reg);
513 
514         /* Wait for TPC completion */
515         status = R592_STATUS_RDY;
516         if (dev->req->need_card_int)
517                 status |= R592_STATUS_CED;
518 
519         error = r592_wait_status(dev, status, status);
520         if (error) {
521                 message("card didn't respond");
522                 goto out;
523         }
524 
525         /* Test IO errors */
526         error = r592_test_io_error(dev);
527         if (error) {
528                 dbg("IO error");
529                 goto out;
530         }
531 
532         /* Read data from FIFO */
533         if (!is_write) {
534                 error = r592_transfer_fifo_dma(dev);
535                 if (error == -EINVAL)
536                         error = r592_transfer_fifo_pio(dev);
537         }
538 
539         /* read INT reg. This can be shortened with shifts, but that way
540                 its more readable */
541         if (dev->parallel_mode && dev->req->need_card_int) {
542 
543                 dev->req->int_reg = 0;
544                 status = r592_read_reg(dev, R592_STATUS);
545 
546                 if (status & R592_STATUS_P_CMDNACK)
547                         dev->req->int_reg |= MEMSTICK_INT_CMDNAK;
548                 if (status & R592_STATUS_P_BREQ)
549                         dev->req->int_reg |= MEMSTICK_INT_BREQ;
550                 if (status & R592_STATUS_P_INTERR)
551                         dev->req->int_reg |= MEMSTICK_INT_ERR;
552                 if (status & R592_STATUS_P_CED)
553                         dev->req->int_reg |= MEMSTICK_INT_CED;
554         }
555 
556         if (error)
557                 dbg("FIFO read error");
558 out:
559         dev->req->error = error;
560         r592_clear_reg_mask(dev, R592_REG_MSC, R592_REG_MSC_LED);
561         return;
562 }
563 
564 /* Main request processing thread */
565 static int r592_process_thread(void *data)
566 {
567         int error;
568         struct r592_device *dev = (struct r592_device *)data;
569         unsigned long flags;
570 
571         while (!kthread_should_stop()) {
572                 spin_lock_irqsave(&dev->io_thread_lock, flags);
573                 set_current_state(TASK_INTERRUPTIBLE);
574                 error = memstick_next_req(dev->host, &dev->req);
575                 spin_unlock_irqrestore(&dev->io_thread_lock, flags);
576 
577                 if (error) {
578                         if (error == -ENXIO || error == -EAGAIN) {
579                                 dbg_verbose("IO: done IO, sleeping");
580                         } else {
581                                 dbg("IO: unknown error from "
582                                         "memstick_next_req %d", error);
583                         }
584 
585                         if (kthread_should_stop())
586                                 set_current_state(TASK_RUNNING);
587 
588                         schedule();
589                 } else {
590                         set_current_state(TASK_RUNNING);
591                         r592_execute_tpc(dev);
592                 }
593         }
594         return 0;
595 }
596 
597 /* Reprogram chip to detect change in card state */
598 /* eg, if card is detected, arm it to detect removal, and vice versa */
599 static void r592_update_card_detect(struct r592_device *dev)
600 {
601         u32 reg = r592_read_reg(dev, R592_REG_MSC);
602         bool card_detected = reg & R592_REG_MSC_PRSNT;
603 
604         dbg("update card detect. card state: %s", card_detected ?
605                 "present" : "absent");
606 
607         reg &= ~((R592_REG_MSC_IRQ_REMOVE | R592_REG_MSC_IRQ_INSERT) << 16);
608 
609         if (card_detected)
610                 reg |= (R592_REG_MSC_IRQ_REMOVE << 16);
611         else
612                 reg |= (R592_REG_MSC_IRQ_INSERT << 16);
613 
614         r592_write_reg(dev, R592_REG_MSC, reg);
615 }
616 
617 /* Timer routine that fires 1 second after last card detection event, */
618 static void r592_detect_timer(long unsigned int data)
619 {
620         struct r592_device *dev = (struct r592_device *)data;
621         r592_update_card_detect(dev);
622         memstick_detect_change(dev->host);
623 }
624 
625 /* Interrupt handler */
626 static irqreturn_t r592_irq(int irq, void *data)
627 {
628         struct r592_device *dev = (struct r592_device *)data;
629         irqreturn_t ret = IRQ_NONE;
630         u32 reg;
631         u16 irq_enable, irq_status;
632         unsigned long flags;
633         int error;
634 
635         spin_lock_irqsave(&dev->irq_lock, flags);
636 
637         reg = r592_read_reg(dev, R592_REG_MSC);
638         irq_enable = reg >> 16;
639         irq_status = reg & 0xFFFF;
640 
641         /* Ack the interrupts */
642         reg &= ~irq_status;
643         r592_write_reg(dev, R592_REG_MSC, reg);
644 
645         /* Get the IRQ status minus bits that aren't enabled */
646         irq_status &= (irq_enable);
647 
648         /* Due to limitation of memstick core, we don't look at bits that
649                 indicate that card was removed/inserted and/or present */
650         if (irq_status & (R592_REG_MSC_IRQ_INSERT | R592_REG_MSC_IRQ_REMOVE)) {
651 
652                 bool card_was_added = irq_status & R592_REG_MSC_IRQ_INSERT;
653                 ret = IRQ_HANDLED;
654 
655                 message("IRQ: card %s", card_was_added ? "added" : "removed");
656 
657                 mod_timer(&dev->detect_timer,
658                         jiffies + msecs_to_jiffies(card_was_added ? 500 : 50));
659         }
660 
661         if (irq_status &
662                 (R592_REG_MSC_FIFO_DMA_DONE | R592_REG_MSC_FIFO_DMA_ERR)) {
663                 ret = IRQ_HANDLED;
664 
665                 if (irq_status & R592_REG_MSC_FIFO_DMA_ERR) {
666                         message("IRQ: DMA error");
667                         error = -EIO;
668                 } else {
669                         dbg_verbose("IRQ: dma done");
670                         error = 0;
671                 }
672 
673                 r592_stop_dma(dev, error);
674                 complete(&dev->dma_done);
675         }
676 
677         spin_unlock_irqrestore(&dev->irq_lock, flags);
678         return ret;
679 }
680 
681 /* External inteface: set settings */
682 static int r592_set_param(struct memstick_host *host,
683                         enum memstick_param param, int value)
684 {
685         struct r592_device *dev = memstick_priv(host);
686 
687         switch (param) {
688         case MEMSTICK_POWER:
689                 switch (value) {
690                 case MEMSTICK_POWER_ON:
691                         return r592_enable_device(dev, true);
692                 case MEMSTICK_POWER_OFF:
693                         return r592_enable_device(dev, false);
694                 default:
695                         return -EINVAL;
696                 }
697         case MEMSTICK_INTERFACE:
698                 switch (value) {
699                 case MEMSTICK_SERIAL:
700                         return r592_set_mode(dev, 0);
701                 case MEMSTICK_PAR4:
702                         return r592_set_mode(dev, 1);
703                 default:
704                         return -EINVAL;
705                 }
706         default:
707                 return -EINVAL;
708         }
709 }
710 
711 /* External interface: submit requests */
712 static void r592_submit_req(struct memstick_host *host)
713 {
714         struct r592_device *dev = memstick_priv(host);
715         unsigned long flags;
716 
717         if (dev->req)
718                 return;
719 
720         spin_lock_irqsave(&dev->io_thread_lock, flags);
721         if (wake_up_process(dev->io_thread))
722                 dbg_verbose("IO thread woken to process requests");
723         spin_unlock_irqrestore(&dev->io_thread_lock, flags);
724 }
725 
726 static const struct pci_device_id r592_pci_id_tbl[] = {
727 
728         { PCI_VDEVICE(RICOH, 0x0592), },
729         { },
730 };
731 
732 /* Main entry */
733 static int r592_probe(struct pci_dev *pdev, const struct pci_device_id *id)
734 {
735         int error = -ENOMEM;
736         struct memstick_host *host;
737         struct r592_device *dev;
738 
739         /* Allocate memory */
740         host = memstick_alloc_host(sizeof(struct r592_device), &pdev->dev);
741         if (!host)
742                 goto error1;
743 
744         dev = memstick_priv(host);
745         dev->host = host;
746         dev->pci_dev = pdev;
747         pci_set_drvdata(pdev, dev);
748 
749         /* pci initialization */
750         error = pci_enable_device(pdev);
751         if (error)
752                 goto error2;
753 
754         pci_set_master(pdev);
755         error = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
756         if (error)
757                 goto error3;
758 
759         error = pci_request_regions(pdev, DRV_NAME);
760         if (error)
761                 goto error3;
762 
763         dev->mmio = pci_ioremap_bar(pdev, 0);
764         if (!dev->mmio)
765                 goto error4;
766 
767         dev->irq = pdev->irq;
768         spin_lock_init(&dev->irq_lock);
769         spin_lock_init(&dev->io_thread_lock);
770         init_completion(&dev->dma_done);
771         INIT_KFIFO(dev->pio_fifo);
772         setup_timer(&dev->detect_timer,
773                 r592_detect_timer, (long unsigned int)dev);
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 = pci_alloc_consistent(pdev, PAGE_SIZE,
789                 &dev->dummy_dma_page_physical_address);
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                 pci_free_consistent(pdev, 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                 pci_free_consistent(pdev, 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");
897 

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