Version:  2.0.40 2.2.26 2.4.37 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 3.17 3.18

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 #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 ||
302                         (sg_dma_len(&dev->req->sg) < dev->req->sg.length)) {
303                 message("problem in dma_map_sg");
304                 return -EIO;
305         }
306 
307         r592_start_dma(dev, is_write);
308 
309         /* Wait for DMA completion */
310         if (!wait_for_completion_timeout(
311                         &dev->dma_done, msecs_to_jiffies(1000))) {
312                 message("DMA timeout");
313                 r592_stop_dma(dev, -ETIMEDOUT);
314         }
315 
316         dma_unmap_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ?
317                 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
318 
319 
320         return dev->dma_error;
321 }
322 
323 /*
324  * Writes the FIFO in 4 byte chunks.
325  * If length isn't 4 byte aligned, rest of the data if put to a fifo
326  * to be written later
327  * Use r592_flush_fifo_write to flush that fifo when writing for the
328  * last time
329  */
330 static void r592_write_fifo_pio(struct r592_device *dev,
331                                         unsigned char *buffer, int len)
332 {
333         /* flush spill from former write */
334         if (!kfifo_is_empty(&dev->pio_fifo)) {
335 
336                 u8 tmp[4] = {0};
337                 int copy_len = kfifo_in(&dev->pio_fifo, buffer, len);
338 
339                 if (!kfifo_is_full(&dev->pio_fifo))
340                         return;
341                 len -= copy_len;
342                 buffer += copy_len;
343 
344                 copy_len = kfifo_out(&dev->pio_fifo, tmp, 4);
345                 WARN_ON(copy_len != 4);
346                 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)tmp);
347         }
348 
349         WARN_ON(!kfifo_is_empty(&dev->pio_fifo));
350 
351         /* write full dwords */
352         while (len >= 4) {
353                 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
354                 buffer += 4;
355                 len -= 4;
356         }
357 
358         /* put remaining bytes to the spill */
359         if (len)
360                 kfifo_in(&dev->pio_fifo, buffer, len);
361 }
362 
363 /* Flushes the temporary FIFO used to make aligned DWORD writes */
364 static void r592_flush_fifo_write(struct r592_device *dev)
365 {
366         u8 buffer[4] = { 0 };
367         int len;
368 
369         if (kfifo_is_empty(&dev->pio_fifo))
370                 return;
371 
372         len = kfifo_out(&dev->pio_fifo, buffer, 4);
373         r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
374 }
375 
376 /*
377  * Read a fifo in 4 bytes chunks.
378  * If input doesn't fit the buffer, it places bytes of last dword in spill
379  * buffer, so that they don't get lost on last read, just throw these away.
380  */
381 static void r592_read_fifo_pio(struct r592_device *dev,
382                                                 unsigned char *buffer, int len)
383 {
384         u8 tmp[4];
385 
386         /* Read from last spill */
387         if (!kfifo_is_empty(&dev->pio_fifo)) {
388                 int bytes_copied =
389                         kfifo_out(&dev->pio_fifo, buffer, min(4, len));
390                 buffer += bytes_copied;
391                 len -= bytes_copied;
392 
393                 if (!kfifo_is_empty(&dev->pio_fifo))
394                         return;
395         }
396 
397         /* Reads dwords from FIFO */
398         while (len >= 4) {
399                 *(u32 *)buffer = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
400                 buffer += 4;
401                 len -= 4;
402         }
403 
404         if (len) {
405                 *(u32 *)tmp = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
406                 kfifo_in(&dev->pio_fifo, tmp, 4);
407                 len -= kfifo_out(&dev->pio_fifo, buffer, len);
408         }
409 
410         WARN_ON(len);
411         return;
412 }
413 
414 /* Transfers actual data using PIO. */
415 static int r592_transfer_fifo_pio(struct r592_device *dev)
416 {
417         unsigned long flags;
418 
419         bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
420         struct sg_mapping_iter miter;
421 
422         kfifo_reset(&dev->pio_fifo);
423 
424         if (!dev->req->long_data) {
425                 if (is_write) {
426                         r592_write_fifo_pio(dev, dev->req->data,
427                                                         dev->req->data_len);
428                         r592_flush_fifo_write(dev);
429                 } else
430                         r592_read_fifo_pio(dev, dev->req->data,
431                                                         dev->req->data_len);
432                 return 0;
433         }
434 
435         local_irq_save(flags);
436         sg_miter_start(&miter, &dev->req->sg, 1, SG_MITER_ATOMIC |
437                 (is_write ? SG_MITER_FROM_SG : SG_MITER_TO_SG));
438 
439         /* Do the transfer fifo<->memory*/
440         while (sg_miter_next(&miter))
441                 if (is_write)
442                         r592_write_fifo_pio(dev, miter.addr, miter.length);
443                 else
444                         r592_read_fifo_pio(dev, miter.addr, miter.length);
445 
446 
447         /* Write last few non aligned bytes*/
448         if (is_write)
449                 r592_flush_fifo_write(dev);
450 
451         sg_miter_stop(&miter);
452         local_irq_restore(flags);
453         return 0;
454 }
455 
456 /* Executes one TPC (data is read/written from small or large fifo) */
457 static void r592_execute_tpc(struct r592_device *dev)
458 {
459         bool is_write;
460         int len, error;
461         u32 status, reg;
462 
463         if (!dev->req) {
464                 message("BUG: tpc execution without request!");
465                 return;
466         }
467 
468         is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
469         len = dev->req->long_data ?
470                 dev->req->sg.length : dev->req->data_len;
471 
472         /* Ensure that FIFO can hold the input data */
473         if (len > R592_LFIFO_SIZE) {
474                 message("IO: hardware doesn't support TPCs longer that 512");
475                 error = -ENOSYS;
476                 goto out;
477         }
478 
479         if (!(r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_PRSNT)) {
480                 dbg("IO: refusing to send TPC because card is absent");
481                 error = -ENODEV;
482                 goto out;
483         }
484 
485         dbg("IO: executing %s LEN=%d",
486                         memstick_debug_get_tpc_name(dev->req->tpc), len);
487 
488         /* Set IO direction */
489         if (is_write)
490                 r592_set_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
491         else
492                 r592_clear_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
493 
494 
495         error = r592_test_fifo_empty(dev);
496         if (error)
497                 goto out;
498 
499         /* Transfer write data */
500         if (is_write) {
501                 error = r592_transfer_fifo_dma(dev);
502                 if (error == -EINVAL)
503                         error = r592_transfer_fifo_pio(dev);
504         }
505 
506         if (error)
507                 goto out;
508 
509         /* Trigger the TPC */
510         reg = (len << R592_TPC_EXEC_LEN_SHIFT) |
511                 (dev->req->tpc << R592_TPC_EXEC_TPC_SHIFT) |
512                         R592_TPC_EXEC_BIG_FIFO;
513 
514         r592_write_reg(dev, R592_TPC_EXEC, reg);
515 
516         /* Wait for TPC completion */
517         status = R592_STATUS_RDY;
518         if (dev->req->need_card_int)
519                 status |= R592_STATUS_CED;
520 
521         error = r592_wait_status(dev, status, status);
522         if (error) {
523                 message("card didn't respond");
524                 goto out;
525         }
526 
527         /* Test IO errors */
528         error = r592_test_io_error(dev);
529         if (error) {
530                 dbg("IO error");
531                 goto out;
532         }
533 
534         /* Read data from FIFO */
535         if (!is_write) {
536                 error = r592_transfer_fifo_dma(dev);
537                 if (error == -EINVAL)
538                         error = r592_transfer_fifo_pio(dev);
539         }
540 
541         /* read INT reg. This can be shortened with shifts, but that way
542                 its more readable */
543         if (dev->parallel_mode && dev->req->need_card_int) {
544 
545                 dev->req->int_reg = 0;
546                 status = r592_read_reg(dev, R592_STATUS);
547 
548                 if (status & R592_STATUS_P_CMDNACK)
549                         dev->req->int_reg |= MEMSTICK_INT_CMDNAK;
550                 if (status & R592_STATUS_P_BREQ)
551                         dev->req->int_reg |= MEMSTICK_INT_BREQ;
552                 if (status & R592_STATUS_P_INTERR)
553                         dev->req->int_reg |= MEMSTICK_INT_ERR;
554                 if (status & R592_STATUS_P_CED)
555                         dev->req->int_reg |= MEMSTICK_INT_CED;
556         }
557 
558         if (error)
559                 dbg("FIFO read error");
560 out:
561         dev->req->error = error;
562         r592_clear_reg_mask(dev, R592_REG_MSC, R592_REG_MSC_LED);
563         return;
564 }
565 
566 /* Main request processing thread */
567 static int r592_process_thread(void *data)
568 {
569         int error;
570         struct r592_device *dev = (struct r592_device *)data;
571         unsigned long flags;
572 
573         while (!kthread_should_stop()) {
574                 spin_lock_irqsave(&dev->io_thread_lock, flags);
575                 set_current_state(TASK_INTERRUPTIBLE);
576                 error = memstick_next_req(dev->host, &dev->req);
577                 spin_unlock_irqrestore(&dev->io_thread_lock, flags);
578 
579                 if (error) {
580                         if (error == -ENXIO || error == -EAGAIN) {
581                                 dbg_verbose("IO: done IO, sleeping");
582                         } else {
583                                 dbg("IO: unknown error from "
584                                         "memstick_next_req %d", error);
585                         }
586 
587                         if (kthread_should_stop())
588                                 set_current_state(TASK_RUNNING);
589 
590                         schedule();
591                 } else {
592                         set_current_state(TASK_RUNNING);
593                         r592_execute_tpc(dev);
594                 }
595         }
596         return 0;
597 }
598 
599 /* Reprogram chip to detect change in card state */
600 /* eg, if card is detected, arm it to detect removal, and vice versa */
601 static void r592_update_card_detect(struct r592_device *dev)
602 {
603         u32 reg = r592_read_reg(dev, R592_REG_MSC);
604         bool card_detected = reg & R592_REG_MSC_PRSNT;
605 
606         dbg("update card detect. card state: %s", card_detected ?
607                 "present" : "absent");
608 
609         reg &= ~((R592_REG_MSC_IRQ_REMOVE | R592_REG_MSC_IRQ_INSERT) << 16);
610 
611         if (card_detected)
612                 reg |= (R592_REG_MSC_IRQ_REMOVE << 16);
613         else
614                 reg |= (R592_REG_MSC_IRQ_INSERT << 16);
615 
616         r592_write_reg(dev, R592_REG_MSC, reg);
617 }
618 
619 /* Timer routine that fires 1 second after last card detection event, */
620 static void r592_detect_timer(long unsigned int data)
621 {
622         struct r592_device *dev = (struct r592_device *)data;
623         r592_update_card_detect(dev);
624         memstick_detect_change(dev->host);
625 }
626 
627 /* Interrupt handler */
628 static irqreturn_t r592_irq(int irq, void *data)
629 {
630         struct r592_device *dev = (struct r592_device *)data;
631         irqreturn_t ret = IRQ_NONE;
632         u32 reg;
633         u16 irq_enable, irq_status;
634         unsigned long flags;
635         int error;
636 
637         spin_lock_irqsave(&dev->irq_lock, flags);
638 
639         reg = r592_read_reg(dev, R592_REG_MSC);
640         irq_enable = reg >> 16;
641         irq_status = reg & 0xFFFF;
642 
643         /* Ack the interrupts */
644         reg &= ~irq_status;
645         r592_write_reg(dev, R592_REG_MSC, reg);
646 
647         /* Get the IRQ status minus bits that aren't enabled */
648         irq_status &= (irq_enable);
649 
650         /* Due to limitation of memstick core, we don't look at bits that
651                 indicate that card was removed/inserted and/or present */
652         if (irq_status & (R592_REG_MSC_IRQ_INSERT | R592_REG_MSC_IRQ_REMOVE)) {
653 
654                 bool card_was_added = irq_status & R592_REG_MSC_IRQ_INSERT;
655                 ret = IRQ_HANDLED;
656 
657                 message("IRQ: card %s", card_was_added ? "added" : "removed");
658 
659                 mod_timer(&dev->detect_timer,
660                         jiffies + msecs_to_jiffies(card_was_added ? 500 : 50));
661         }
662 
663         if (irq_status &
664                 (R592_REG_MSC_FIFO_DMA_DONE | R592_REG_MSC_FIFO_DMA_ERR)) {
665                 ret = IRQ_HANDLED;
666 
667                 if (irq_status & R592_REG_MSC_FIFO_DMA_ERR) {
668                         message("IRQ: DMA error");
669                         error = -EIO;
670                 } else {
671                         dbg_verbose("IRQ: dma done");
672                         error = 0;
673                 }
674 
675                 r592_stop_dma(dev, error);
676                 complete(&dev->dma_done);
677         }
678 
679         spin_unlock_irqrestore(&dev->irq_lock, flags);
680         return ret;
681 }
682 
683 /* External inteface: set settings */
684 static int r592_set_param(struct memstick_host *host,
685                         enum memstick_param param, int value)
686 {
687         struct r592_device *dev = memstick_priv(host);
688 
689         switch (param) {
690         case MEMSTICK_POWER:
691                 switch (value) {
692                 case MEMSTICK_POWER_ON:
693                         return r592_enable_device(dev, true);
694                 case MEMSTICK_POWER_OFF:
695                         return r592_enable_device(dev, false);
696                 default:
697                         return -EINVAL;
698                 }
699         case MEMSTICK_INTERFACE:
700                 switch (value) {
701                 case MEMSTICK_SERIAL:
702                         return r592_set_mode(dev, 0);
703                 case MEMSTICK_PAR4:
704                         return r592_set_mode(dev, 1);
705                 default:
706                         return -EINVAL;
707                 }
708         default:
709                 return -EINVAL;
710         }
711 }
712 
713 /* External interface: submit requests */
714 static void r592_submit_req(struct memstick_host *host)
715 {
716         struct r592_device *dev = memstick_priv(host);
717         unsigned long flags;
718 
719         if (dev->req)
720                 return;
721 
722         spin_lock_irqsave(&dev->io_thread_lock, flags);
723         if (wake_up_process(dev->io_thread))
724                 dbg_verbose("IO thread woken to process requests");
725         spin_unlock_irqrestore(&dev->io_thread_lock, flags);
726 }
727 
728 static const struct pci_device_id r592_pci_id_tbl[] = {
729 
730         { PCI_VDEVICE(RICOH, 0x0592), },
731         { },
732 };
733 
734 /* Main entry */
735 static int r592_probe(struct pci_dev *pdev, const struct pci_device_id *id)
736 {
737         int error = -ENOMEM;
738         struct memstick_host *host;
739         struct r592_device *dev;
740 
741         /* Allocate memory */
742         host = memstick_alloc_host(sizeof(struct r592_device), &pdev->dev);
743         if (!host)
744                 goto error1;
745 
746         dev = memstick_priv(host);
747         dev->host = host;
748         dev->pci_dev = pdev;
749         pci_set_drvdata(pdev, dev);
750 
751         /* pci initialization */
752         error = pci_enable_device(pdev);
753         if (error)
754                 goto error2;
755 
756         pci_set_master(pdev);
757         error = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
758         if (error)
759                 goto error3;
760 
761         error = pci_request_regions(pdev, DRV_NAME);
762         if (error)
763                 goto error3;
764 
765         dev->mmio = pci_ioremap_bar(pdev, 0);
766         if (!dev->mmio)
767                 goto error4;
768 
769         dev->irq = pdev->irq;
770         spin_lock_init(&dev->irq_lock);
771         spin_lock_init(&dev->io_thread_lock);
772         init_completion(&dev->dma_done);
773         INIT_KFIFO(dev->pio_fifo);
774         setup_timer(&dev->detect_timer,
775                 r592_detect_timer, (long unsigned int)dev);
776 
777         /* Host initialization */
778         host->caps = MEMSTICK_CAP_PAR4;
779         host->request = r592_submit_req;
780         host->set_param = r592_set_param;
781         r592_check_dma(dev);
782 
783         dev->io_thread = kthread_run(r592_process_thread, dev, "r592_io");
784         if (IS_ERR(dev->io_thread)) {
785                 error = PTR_ERR(dev->io_thread);
786                 goto error5;
787         }
788 
789         /* This is just a precation, so don't fail */
790         dev->dummy_dma_page = pci_alloc_consistent(pdev, PAGE_SIZE,
791                 &dev->dummy_dma_page_physical_address);
792         r592_stop_dma(dev , 0);
793 
794         if (request_irq(dev->irq, &r592_irq, IRQF_SHARED,
795                           DRV_NAME, dev))
796                 goto error6;
797 
798         r592_update_card_detect(dev);
799         if (memstick_add_host(host))
800                 goto error7;
801 
802         message("driver successfully loaded");
803         return 0;
804 error7:
805         free_irq(dev->irq, dev);
806 error6:
807         if (dev->dummy_dma_page)
808                 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page,
809                         dev->dummy_dma_page_physical_address);
810 
811         kthread_stop(dev->io_thread);
812 error5:
813         iounmap(dev->mmio);
814 error4:
815         pci_release_regions(pdev);
816 error3:
817         pci_disable_device(pdev);
818 error2:
819         memstick_free_host(host);
820 error1:
821         return error;
822 }
823 
824 static void r592_remove(struct pci_dev *pdev)
825 {
826         int error = 0;
827         struct r592_device *dev = pci_get_drvdata(pdev);
828 
829         /* Stop the processing thread.
830         That ensures that we won't take any more requests */
831         kthread_stop(dev->io_thread);
832 
833         r592_enable_device(dev, false);
834 
835         while (!error && dev->req) {
836                 dev->req->error = -ETIME;
837                 error = memstick_next_req(dev->host, &dev->req);
838         }
839         memstick_remove_host(dev->host);
840 
841         free_irq(dev->irq, dev);
842         iounmap(dev->mmio);
843         pci_release_regions(pdev);
844         pci_disable_device(pdev);
845         memstick_free_host(dev->host);
846 
847         if (dev->dummy_dma_page)
848                 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page,
849                         dev->dummy_dma_page_physical_address);
850 }
851 
852 #ifdef CONFIG_PM_SLEEP
853 static int r592_suspend(struct device *core_dev)
854 {
855         struct pci_dev *pdev = to_pci_dev(core_dev);
856         struct r592_device *dev = pci_get_drvdata(pdev);
857 
858         r592_clear_interrupts(dev);
859         memstick_suspend_host(dev->host);
860         del_timer_sync(&dev->detect_timer);
861         return 0;
862 }
863 
864 static int r592_resume(struct device *core_dev)
865 {
866         struct pci_dev *pdev = to_pci_dev(core_dev);
867         struct r592_device *dev = pci_get_drvdata(pdev);
868 
869         r592_clear_interrupts(dev);
870         r592_enable_device(dev, false);
871         memstick_resume_host(dev->host);
872         r592_update_card_detect(dev);
873         return 0;
874 }
875 #endif
876 
877 static SIMPLE_DEV_PM_OPS(r592_pm_ops, r592_suspend, r592_resume);
878 
879 MODULE_DEVICE_TABLE(pci, r592_pci_id_tbl);
880 
881 static struct pci_driver r852_pci_driver = {
882         .name           = DRV_NAME,
883         .id_table       = r592_pci_id_tbl,
884         .probe          = r592_probe,
885         .remove         = r592_remove,
886         .driver.pm      = &r592_pm_ops,
887 };
888 
889 module_pci_driver(r852_pci_driver);
890 
891 module_param_named(enable_dma, r592_enable_dma, bool, S_IRUGO);
892 MODULE_PARM_DESC(enable_dma, "Enable usage of the DMA (default)");
893 module_param(debug, int, S_IRUGO | S_IWUSR);
894 MODULE_PARM_DESC(debug, "Debug level (0-3)");
895 
896 MODULE_LICENSE("GPL");
897 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
898 MODULE_DESCRIPTION("Ricoh R5C592 Memstick/Memstick PRO card reader driver");
899 

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