Showing error 884

User: Jiri Slaby
Error type: Resource Leak
Error type description: The code omits to put the resource to the system for reuse
File location: drivers/mmc/host/sdricoh_cs.c
Line in file: 483
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Entered: 2011-11-07 22:41:42 UTC

Source: 

  1/*
  2 *  sdricoh_cs.c - driver for Ricoh Secure Digital Card Readers that can be
  3 *     found on some Ricoh RL5c476 II cardbus bridge
  4 *
  5 *  Copyright (C) 2006 - 2008 Sascha Sommer <saschasommer@freenet.de>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 *
 12 * This program is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15 * GNU General Public License for more details.
 16 *
 17 * You should have received a copy of the GNU General Public License
 18 * along with this program; if not, write to the Free Software
 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 20 *
 21 */
 22
 23/*
 24#define DEBUG
 25#define VERBOSE_DEBUG
 26*/
 27#include <linux/delay.h>
 28#include <linux/highmem.h>
 29#include <linux/pci.h>
 30#include <linux/ioport.h>
 31#include <linux/scatterlist.h>
 32
 33#include <pcmcia/cs_types.h>
 34#include <pcmcia/cs.h>
 35#include <pcmcia/cistpl.h>
 36#include <pcmcia/ds.h>
 37#include <linux/io.h>
 38
 39#include <linux/mmc/host.h>
 40
 41#define DRIVER_NAME "sdricoh_cs"
 42
 43static unsigned int switchlocked;
 44
 45/* i/o region */
 46#define SDRICOH_PCI_REGION 0
 47#define SDRICOH_PCI_REGION_SIZE 0x1000
 48
 49/* registers */
 50#define R104_VERSION     0x104
 51#define R200_CMD         0x200
 52#define R204_CMD_ARG     0x204
 53#define R208_DATAIO      0x208
 54#define R20C_RESP        0x20c
 55#define R21C_STATUS      0x21c
 56#define R2E0_INIT        0x2e0
 57#define R2E4_STATUS_RESP 0x2e4
 58#define R2F0_RESET       0x2f0
 59#define R224_MODE        0x224
 60#define R226_BLOCKSIZE   0x226
 61#define R228_POWER       0x228
 62#define R230_DATA        0x230
 63
 64/* flags for the R21C_STATUS register */
 65#define STATUS_CMD_FINISHED      0x00000001
 66#define STATUS_TRANSFER_FINISHED 0x00000004
 67#define STATUS_CARD_INSERTED     0x00000020
 68#define STATUS_CARD_LOCKED       0x00000080
 69#define STATUS_CMD_TIMEOUT       0x00400000
 70#define STATUS_READY_TO_READ     0x01000000
 71#define STATUS_READY_TO_WRITE    0x02000000
 72#define STATUS_BUSY              0x40000000
 73
 74/* timeouts */
 75#define INIT_TIMEOUT      100
 76#define CMD_TIMEOUT       100000
 77#define TRANSFER_TIMEOUT  100000
 78#define BUSY_TIMEOUT      32767
 79
 80/* list of supported pcmcia devices */
 81static struct pcmcia_device_id pcmcia_ids[] = {
 82        /* vendor and device strings followed by their crc32 hashes */
 83        PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay1Controller", 0xd9f522ed,
 84                                0xc3901202),
 85        PCMCIA_DEVICE_NULL,
 86};
 87
 88MODULE_DEVICE_TABLE(pcmcia, pcmcia_ids);
 89
 90/* mmc privdata */
 91struct sdricoh_host {
 92        struct device *dev;
 93        struct mmc_host *mmc;        /* MMC structure */
 94        unsigned char __iomem *iobase;
 95        struct pci_dev *pci_dev;
 96        int app_cmd;
 97};
 98
 99/***************** register i/o helper functions *****************************/
100
101static inline unsigned int sdricoh_readl(struct sdricoh_host *host,
102                                         unsigned int reg)
103{
104        unsigned int value = readl(host->iobase + reg);
105        dev_vdbg(host->dev, "rl %x 0x%x\n", reg, value);
106        return value;
107}
108
109static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
110                                  unsigned int value)
111{
112        writel(value, host->iobase + reg);
113        dev_vdbg(host->dev, "wl %x 0x%x\n", reg, value);
114
115}
116
117static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
118                                         unsigned int reg)
119{
120        unsigned int value = readw(host->iobase + reg);
121        dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
122        return value;
123}
124
125static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
126                                         unsigned short value)
127{
128        writew(value, host->iobase + reg);
129        dev_vdbg(host->dev, "ww %x 0x%x\n", reg, value);
130}
131
132static inline unsigned int sdricoh_readb(struct sdricoh_host *host,
133                                         unsigned int reg)
134{
135        unsigned int value = readb(host->iobase + reg);
136        dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
137        return value;
138}
139
140static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted,
141                                unsigned int timeout){
142        unsigned int loop;
143        unsigned int status = 0;
144        struct device *dev = host->dev;
145        for (loop = 0; loop < timeout; loop++) {
146                status = sdricoh_readl(host, R21C_STATUS);
147                sdricoh_writel(host, R2E4_STATUS_RESP, status);
148                if (status & wanted)
149                        break;
150        }
151
152        if (loop == timeout) {
153                dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
154                return -ETIMEDOUT;
155        }
156
157        /* do not do this check in the loop as some commands fail otherwise */
158        if (status & 0x7F0000) {
159                dev_err(dev, "waiting for status bit %x failed\n", wanted);
160                return -EINVAL;
161        }
162        return 0;
163
164}
165
166static int sdricoh_mmc_cmd(struct sdricoh_host *host, unsigned char opcode,
167                           unsigned int arg)
168{
169        unsigned int status;
170        int result = 0;
171        unsigned int loop = 0;
172        /* reset status reg? */
173        sdricoh_writel(host, R21C_STATUS, 0x18);
174        /* fill parameters */
175        sdricoh_writel(host, R204_CMD_ARG, arg);
176        sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
177        /* wait for command completion */
178        if (opcode) {
179                for (loop = 0; loop < CMD_TIMEOUT; loop++) {
180                        status = sdricoh_readl(host, R21C_STATUS);
181                        sdricoh_writel(host, R2E4_STATUS_RESP, status);
182                        if (status  & STATUS_CMD_FINISHED)
183                                break;
184                }
185                /* don't check for timeout in the loop it is not always
186                   reset correctly
187                */
188                if (loop == CMD_TIMEOUT || status & STATUS_CMD_TIMEOUT)
189                        result = -ETIMEDOUT;
190
191        }
192
193        return result;
194
195}
196
197static int sdricoh_reset(struct sdricoh_host *host)
198{
199        dev_dbg(host->dev, "reset\n");
200        sdricoh_writel(host, R2F0_RESET, 0x10001);
201        sdricoh_writel(host, R2E0_INIT, 0x10000);
202        if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
203                return -EIO;
204        sdricoh_writel(host, R2E0_INIT, 0x10007);
205
206        sdricoh_writel(host, R224_MODE, 0x2000000);
207        sdricoh_writel(host, R228_POWER, 0xe0);
208
209
210        /* status register ? */
211        sdricoh_writel(host, R21C_STATUS, 0x18);
212
213        return 0;
214}
215
216static int sdricoh_blockio(struct sdricoh_host *host, int read,
217                                u8 *buf, int len)
218{
219        int size;
220        u32 data = 0;
221        /* wait until the data is available */
222        if (read) {
223                if (sdricoh_query_status(host, STATUS_READY_TO_READ,
224                                                TRANSFER_TIMEOUT))
225                        return -ETIMEDOUT;
226                sdricoh_writel(host, R21C_STATUS, 0x18);
227                /* read data */
228                while (len) {
229                        data = sdricoh_readl(host, R230_DATA);
230                        size = min(len, 4);
231                        len -= size;
232                        while (size) {
233                                *buf = data & 0xFF;
234                                buf++;
235                                data >>= 8;
236                                size--;
237                        }
238                }
239        } else {
240                if (sdricoh_query_status(host, STATUS_READY_TO_WRITE,
241                                                TRANSFER_TIMEOUT))
242                        return -ETIMEDOUT;
243                sdricoh_writel(host, R21C_STATUS, 0x18);
244                /* write data */
245                while (len) {
246                        size = min(len, 4);
247                        len -= size;
248                        while (size) {
249                                data >>= 8;
250                                data |= (u32)*buf << 24;
251                                buf++;
252                                size--;
253                        }
254                        sdricoh_writel(host, R230_DATA, data);
255                }
256        }
257
258        if (len)
259                return -EIO;
260
261        return 0;
262}
263
264static void sdricoh_request(struct mmc_host *mmc, struct mmc_request *mrq)
265{
266        struct sdricoh_host *host = mmc_priv(mmc);
267        struct mmc_command *cmd = mrq->cmd;
268        struct mmc_data *data = cmd->data;
269        struct device *dev = host->dev;
270        unsigned char opcode = cmd->opcode;
271        int i;
272
273        dev_dbg(dev, "=============================\n");
274        dev_dbg(dev, "sdricoh_request opcode=%i\n", opcode);
275
276        sdricoh_writel(host, R21C_STATUS, 0x18);
277
278        /* MMC_APP_CMDs need some special handling */
279        if (host->app_cmd) {
280                opcode |= 64;
281                host->app_cmd = 0;
282        } else if (opcode == 55)
283                host->app_cmd = 1;
284
285        /* read/write commands seem to require this */
286        if (data) {
287                sdricoh_writew(host, R226_BLOCKSIZE, data->blksz);
288                sdricoh_writel(host, R208_DATAIO, 0);
289        }
290
291        cmd->error = sdricoh_mmc_cmd(host, opcode, cmd->arg);
292
293        /* read response buffer */
294        if (cmd->flags & MMC_RSP_PRESENT) {
295                if (cmd->flags & MMC_RSP_136) {
296                        /* CRC is stripped so we need to do some shifting. */
297                        for (i = 0; i < 4; i++) {
298                                cmd->resp[i] =
299                                    sdricoh_readl(host,
300                                                  R20C_RESP + (3 - i) * 4) << 8;
301                                if (i != 3)
302                                        cmd->resp[i] |=
303                                            sdricoh_readb(host, R20C_RESP +
304                                                          (3 - i) * 4 - 1);
305                        }
306                } else
307                        cmd->resp[0] = sdricoh_readl(host, R20C_RESP);
308        }
309
310        /* transfer data */
311        if (data && cmd->error == 0) {
312                dev_dbg(dev, "transfer: blksz %i blocks %i sg_len %i "
313                        "sg length %i\n", data->blksz, data->blocks,
314                        data->sg_len, data->sg->length);
315
316                /* enter data reading mode */
317                sdricoh_writel(host, R21C_STATUS, 0x837f031e);
318                for (i = 0; i < data->blocks; i++) {
319                        size_t len = data->blksz;
320                        u8 *buf;
321                        struct page *page;
322                        int result;
323                        page = sg_page(data->sg);
324
325                        buf = kmap(page) + data->sg->offset + (len * i);
326                        result =
327                                sdricoh_blockio(host,
328                                        data->flags & MMC_DATA_READ, buf, len);
329                        kunmap(page);
330                        flush_dcache_page(page);
331                        if (result) {
332                                dev_err(dev, "sdricoh_request: cmd %i "
333                                        "block transfer failed\n", cmd->opcode);
334                                cmd->error = result;
335                                break;
336                        } else
337                                data->bytes_xfered += len;
338                }
339
340                sdricoh_writel(host, R208_DATAIO, 1);
341
342                if (sdricoh_query_status(host, STATUS_TRANSFER_FINISHED,
343                                        TRANSFER_TIMEOUT)) {
344                        dev_err(dev, "sdricoh_request: transfer end error\n");
345                        cmd->error = -EINVAL;
346                }
347        }
348        /* FIXME check busy flag */
349
350        mmc_request_done(mmc, mrq);
351        dev_dbg(dev, "=============================\n");
352}
353
354static void sdricoh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
355{
356        struct sdricoh_host *host = mmc_priv(mmc);
357        dev_dbg(host->dev, "set_ios\n");
358
359        if (ios->power_mode == MMC_POWER_ON) {
360                sdricoh_writel(host, R228_POWER, 0xc0e0);
361
362                if (ios->bus_width == MMC_BUS_WIDTH_4) {
363                        sdricoh_writel(host, R224_MODE, 0x2000300);
364                        sdricoh_writel(host, R228_POWER, 0x40e0);
365                } else {
366                        sdricoh_writel(host, R224_MODE, 0x2000340);
367                }
368
369        } else if (ios->power_mode == MMC_POWER_UP) {
370                sdricoh_writel(host, R224_MODE, 0x2000320);
371                sdricoh_writel(host, R228_POWER, 0xe0);
372        }
373}
374
375static int sdricoh_get_ro(struct mmc_host *mmc)
376{
377        struct sdricoh_host *host = mmc_priv(mmc);
378        unsigned int status;
379
380        status = sdricoh_readl(host, R21C_STATUS);
381        sdricoh_writel(host, R2E4_STATUS_RESP, status);
382
383        /* some notebooks seem to have the locked flag switched */
384        if (switchlocked)
385                return !(status & STATUS_CARD_LOCKED);
386
387        return (status & STATUS_CARD_LOCKED);
388}
389
390static struct mmc_host_ops sdricoh_ops = {
391        .request = sdricoh_request,
392        .set_ios = sdricoh_set_ios,
393        .get_ro = sdricoh_get_ro,
394};
395
396/* initialize the control and register it to the mmc framework */
397static int sdricoh_init_mmc(struct pci_dev *pci_dev,
398                            struct pcmcia_device *pcmcia_dev)
399{
400        int result = 0;
401        void __iomem *iobase = NULL;
402        struct mmc_host *mmc = NULL;
403        struct sdricoh_host *host = NULL;
404        struct device *dev = &pcmcia_dev->dev;
405        /* map iomem */
406        if (pci_resource_len(pci_dev, SDRICOH_PCI_REGION) !=
407            SDRICOH_PCI_REGION_SIZE) {
408                dev_dbg(dev, "unexpected pci resource len\n");
409                return -ENODEV;
410        }
411        iobase =
412            pci_iomap(pci_dev, SDRICOH_PCI_REGION, SDRICOH_PCI_REGION_SIZE);
413        if (!iobase) {
414                dev_err(dev, "unable to map iobase\n");
415                return -ENODEV;
416        }
417        /* check version? */
418        if (readl(iobase + R104_VERSION) != 0x4000) {
419                dev_dbg(dev, "no supported mmc controller found\n");
420                result = -ENODEV;
421                goto err;
422        }
423        /* allocate privdata */
424        mmc = pcmcia_dev->priv =
425            mmc_alloc_host(sizeof(struct sdricoh_host), &pcmcia_dev->dev);
426        if (!mmc) {
427                dev_err(dev, "mmc_alloc_host failed\n");
428                result = -ENOMEM;
429                goto err;
430        }
431        host = mmc_priv(mmc);
432
433        host->iobase = iobase;
434        host->dev = dev;
435        host->pci_dev = pci_dev;
436
437        mmc->ops = &sdricoh_ops;
438
439        /* FIXME: frequency and voltage handling is done by the controller
440         */
441        mmc->f_min = 450000;
442        mmc->f_max = 24000000;
443        mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
444        mmc->caps |= MMC_CAP_4_BIT_DATA;
445
446        mmc->max_seg_size = 1024 * 512;
447        mmc->max_blk_size = 512;
448
449        /* reset the controler */
450        if (sdricoh_reset(host)) {
451                dev_dbg(dev, "could not reset\n");
452                result = -EIO;
453                goto err;
454
455        }
456
457        result = mmc_add_host(mmc);
458
459        if (!result) {
460                dev_dbg(dev, "mmc host registered\n");
461                return 0;
462        }
463
464err:
465        if (iobase)
466                iounmap(iobase);
467        if (mmc)
468                mmc_free_host(mmc);
469
470        return result;
471}
472
473/* search for supported mmc controllers */
474static int sdricoh_pcmcia_probe(struct pcmcia_device *pcmcia_dev)
475{
476        struct pci_dev *pci_dev = NULL;
477
478        dev_info(&pcmcia_dev->dev, "Searching MMC controller for pcmcia device"
479                " %s %s ...\n", pcmcia_dev->prod_id[0], pcmcia_dev->prod_id[1]);
480
481        /* search pci cardbus bridge that contains the mmc controler */
482        /* the io region is already claimed by yenta_socket... */
483        while ((pci_dev =
484                pci_get_device(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476,
485                               pci_dev))) {
486                /* try to init the device */
487                if (!sdricoh_init_mmc(pci_dev, pcmcia_dev)) {
488                        dev_info(&pcmcia_dev->dev, "MMC controller found\n");
489                        return 0;
490                }
491
492        }
493        dev_err(&pcmcia_dev->dev, "No MMC controller was found.\n");
494        return -ENODEV;
495}
496
497static void sdricoh_pcmcia_detach(struct pcmcia_device *link)
498{
499        struct mmc_host *mmc = link->priv;
500
501        dev_dbg(&link->dev, "detach\n");
502
503        /* remove mmc host */
504        if (mmc) {
505                struct sdricoh_host *host = mmc_priv(mmc);
506                mmc_remove_host(mmc);
507                pci_iounmap(host->pci_dev, host->iobase);
508                pci_dev_put(host->pci_dev);
509                mmc_free_host(mmc);
510        }
511        pcmcia_disable_device(link);
512
513}
514
515#ifdef CONFIG_PM
516static int sdricoh_pcmcia_suspend(struct pcmcia_device *link)
517{
518        struct mmc_host *mmc = link->priv;
519        dev_dbg(&link->dev, "suspend\n");
520        mmc_suspend_host(mmc, PMSG_SUSPEND);
521        return 0;
522}
523
524static int sdricoh_pcmcia_resume(struct pcmcia_device *link)
525{
526        struct mmc_host *mmc = link->priv;
527        dev_dbg(&link->dev, "resume\n");
528        sdricoh_reset(mmc_priv(mmc));
529        mmc_resume_host(mmc);
530        return 0;
531}
532#else
533#define sdricoh_pcmcia_suspend NULL
534#define sdricoh_pcmcia_resume NULL
535#endif
536
537static struct pcmcia_driver sdricoh_driver = {
538        .drv = {
539                .name = DRIVER_NAME,
540                },
541        .probe = sdricoh_pcmcia_probe,
542        .remove = sdricoh_pcmcia_detach,
543        .id_table = pcmcia_ids,
544        .suspend = sdricoh_pcmcia_suspend,
545        .resume = sdricoh_pcmcia_resume,
546};
547
548/*****************************************************************************\
549 *                                                                           *
550 * Driver init/exit                                                          *
551 *                                                                           *
552\*****************************************************************************/
553
554static int __init sdricoh_drv_init(void)
555{
556        return pcmcia_register_driver(&sdricoh_driver);
557}
558
559static void __exit sdricoh_drv_exit(void)
560{
561        pcmcia_unregister_driver(&sdricoh_driver);
562}
563
564module_init(sdricoh_drv_init);
565module_exit(sdricoh_drv_exit);
566
567module_param(switchlocked, uint, 0444);
568
569MODULE_AUTHOR("Sascha Sommer <saschasommer@freenet.de>");
570MODULE_DESCRIPTION("Ricoh PCMCIA Secure Digital Interface driver");
571MODULE_LICENSE("GPL");
572
573MODULE_PARM_DESC(switchlocked, "Switch the cards locked status."
574                "Use this when unlocked cards are shown readonly (default 0)");
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