tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/module.h>
30#include <linux/pci.h>
31#include <linux/ioport.h>
32#include <linux/scatterlist.h>
33
34#include <pcmcia/cistpl.h>
35#include <pcmcia/ds.h>
36#include <linux/io.h>
37
38#include <linux/mmc/host.h>
39
40#define DRIVER_NAME "sdricoh_cs"
41
42static unsigned int switchlocked;
43
44/* i/o region */
45#define SDRICOH_PCI_REGION 0
46#define SDRICOH_PCI_REGION_SIZE 0x1000
47
48/* registers */
49#define R104_VERSION 0x104
50#define R200_CMD 0x200
51#define R204_CMD_ARG 0x204
52#define R208_DATAIO 0x208
53#define R20C_RESP 0x20c
54#define R21C_STATUS 0x21c
55#define R2E0_INIT 0x2e0
56#define R2E4_STATUS_RESP 0x2e4
57#define R2F0_RESET 0x2f0
58#define R224_MODE 0x224
59#define R226_BLOCKSIZE 0x226
60#define R228_POWER 0x228
61#define R230_DATA 0x230
62
63/* flags for the R21C_STATUS register */
64#define STATUS_CMD_FINISHED 0x00000001
65#define STATUS_TRANSFER_FINISHED 0x00000004
66#define STATUS_CARD_INSERTED 0x00000020
67#define STATUS_CARD_LOCKED 0x00000080
68#define STATUS_CMD_TIMEOUT 0x00400000
69#define STATUS_READY_TO_READ 0x01000000
70#define STATUS_READY_TO_WRITE 0x02000000
71#define STATUS_BUSY 0x40000000
72
73/* timeouts */
74#define INIT_TIMEOUT 100
75#define CMD_TIMEOUT 100000
76#define TRANSFER_TIMEOUT 100000
77#define BUSY_TIMEOUT 32767
78
79/* list of supported pcmcia devices */
80static const struct pcmcia_device_id pcmcia_ids[] = {
81 /* vendor and device strings followed by their crc32 hashes */
82 PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay1Controller", 0xd9f522ed,
83 0xc3901202),
84 PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay Controller", 0xd9f522ed,
85 0xace80909),
86 PCMCIA_DEVICE_NULL,
87};
88
89MODULE_DEVICE_TABLE(pcmcia, pcmcia_ids);
90
91/* mmc privdata */
92struct sdricoh_host {
93 struct device *dev;
94 struct mmc_host *mmc; /* MMC structure */
95 unsigned char __iomem *iobase;
96 struct pci_dev *pci_dev;
97 int app_cmd;
98};
99
100/***************** register i/o helper functions *****************************/
101
102static inline unsigned int sdricoh_readl(struct sdricoh_host *host,
103 unsigned int reg)
104{
105 unsigned int value = readl(host->iobase + reg);
106 dev_vdbg(host->dev, "rl %x 0x%x\n", reg, value);
107 return value;
108}
109
110static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
111 unsigned int value)
112{
113 writel(value, host->iobase + reg);
114 dev_vdbg(host->dev, "wl %x 0x%x\n", reg, value);
115
116}
117
118static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
119 unsigned int reg)
120{
121 unsigned int value = readw(host->iobase + reg);
122 dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
123 return value;
124}
125
126static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
127 unsigned short value)
128{
129 writew(value, host->iobase + reg);
130 dev_vdbg(host->dev, "ww %x 0x%x\n", reg, value);
131}
132
133static inline unsigned int sdricoh_readb(struct sdricoh_host *host,
134 unsigned int reg)
135{
136 unsigned int value = readb(host->iobase + reg);
137 dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
138 return value;
139}
140
141static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted,
142 unsigned int timeout){
143 unsigned int loop;
144 unsigned int status = 0;
145 struct device *dev = host->dev;
146 for (loop = 0; loop < timeout; loop++) {
147 status = sdricoh_readl(host, R21C_STATUS);
148 sdricoh_writel(host, R2E4_STATUS_RESP, status);
149 if (status & wanted)
150 break;
151 }
152
153 if (loop == timeout) {
154 dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
155 return -ETIMEDOUT;
156 }
157
158 /* do not do this check in the loop as some commands fail otherwise */
159 if (status & 0x7F0000) {
160 dev_err(dev, "waiting for status bit %x failed\n", wanted);
161 return -EINVAL;
162 }
163 return 0;
164
165}
166
167static int sdricoh_mmc_cmd(struct sdricoh_host *host, unsigned char opcode,
168 unsigned int arg)
169{
170 unsigned int status;
171 int result = 0;
172 unsigned int loop = 0;
173 /* reset status reg? */
174 sdricoh_writel(host, R21C_STATUS, 0x18);
175 /* fill parameters */
176 sdricoh_writel(host, R204_CMD_ARG, arg);
177 sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
178 /* wait for command completion */
179 if (opcode) {
180 for (loop = 0; loop < CMD_TIMEOUT; loop++) {
181 status = sdricoh_readl(host, R21C_STATUS);
182 sdricoh_writel(host, R2E4_STATUS_RESP, status);
183 if (status & STATUS_CMD_FINISHED)
184 break;
185 }
186 /* don't check for timeout in the loop it is not always
187 reset correctly
188 */
189 if (loop == CMD_TIMEOUT || status & STATUS_CMD_TIMEOUT)
190 result = -ETIMEDOUT;
191
192 }
193
194 return result;
195
196}
197
198static int sdricoh_reset(struct sdricoh_host *host)
199{
200 dev_dbg(host->dev, "reset\n");
201 sdricoh_writel(host, R2F0_RESET, 0x10001);
202 sdricoh_writel(host, R2E0_INIT, 0x10000);
203 if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
204 return -EIO;
205 sdricoh_writel(host, R2E0_INIT, 0x10007);
206
207 sdricoh_writel(host, R224_MODE, 0x2000000);
208 sdricoh_writel(host, R228_POWER, 0xe0);
209
210
211 /* status register ? */
212 sdricoh_writel(host, R21C_STATUS, 0x18);
213
214 return 0;
215}
216
217static int sdricoh_blockio(struct sdricoh_host *host, int read,
218 u8 *buf, int len)
219{
220 int size;
221 u32 data = 0;
222 /* wait until the data is available */
223 if (read) {
224 if (sdricoh_query_status(host, STATUS_READY_TO_READ,
225 TRANSFER_TIMEOUT))
226 return -ETIMEDOUT;
227 sdricoh_writel(host, R21C_STATUS, 0x18);
228 /* read data */
229 while (len) {
230 data = sdricoh_readl(host, R230_DATA);
231 size = min(len, 4);
232 len -= size;
233 while (size) {
234 *buf = data & 0xFF;
235 buf++;
236 data >>= 8;
237 size--;
238 }
239 }
240 } else {
241 if (sdricoh_query_status(host, STATUS_READY_TO_WRITE,
242 TRANSFER_TIMEOUT))
243 return -ETIMEDOUT;
244 sdricoh_writel(host, R21C_STATUS, 0x18);
245 /* write data */
246 while (len) {
247 size = min(len, 4);
248 len -= size;
249 while (size) {
250 data >>= 8;
251 data |= (u32)*buf << 24;
252 buf++;
253 size--;
254 }
255 sdricoh_writel(host, R230_DATA, data);
256 }
257 }
258
259 return 0;
260}
261
262static void sdricoh_request(struct mmc_host *mmc, struct mmc_request *mrq)
263{
264 struct sdricoh_host *host = mmc_priv(mmc);
265 struct mmc_command *cmd = mrq->cmd;
266 struct mmc_data *data = cmd->data;
267 struct device *dev = host->dev;
268 unsigned char opcode = cmd->opcode;
269 int i;
270
271 dev_dbg(dev, "=============================\n");
272 dev_dbg(dev, "sdricoh_request opcode=%i\n", opcode);
273
274 sdricoh_writel(host, R21C_STATUS, 0x18);
275
276 /* MMC_APP_CMDs need some special handling */
277 if (host->app_cmd) {
278 opcode |= 64;
279 host->app_cmd = 0;
280 } else if (opcode == 55)
281 host->app_cmd = 1;
282
283 /* read/write commands seem to require this */
284 if (data) {
285 sdricoh_writew(host, R226_BLOCKSIZE, data->blksz);
286 sdricoh_writel(host, R208_DATAIO, 0);
287 }
288
289 cmd->error = sdricoh_mmc_cmd(host, opcode, cmd->arg);
290
291 /* read response buffer */
292 if (cmd->flags & MMC_RSP_PRESENT) {
293 if (cmd->flags & MMC_RSP_136) {
294 /* CRC is stripped so we need to do some shifting. */
295 for (i = 0; i < 4; i++) {
296 cmd->resp[i] =
297 sdricoh_readl(host,
298 R20C_RESP + (3 - i) * 4) << 8;
299 if (i != 3)
300 cmd->resp[i] |=
301 sdricoh_readb(host, R20C_RESP +
302 (3 - i) * 4 - 1);
303 }
304 } else
305 cmd->resp[0] = sdricoh_readl(host, R20C_RESP);
306 }
307
308 /* transfer data */
309 if (data && cmd->error == 0) {
310 dev_dbg(dev, "transfer: blksz %i blocks %i sg_len %i "
311 "sg length %i\n", data->blksz, data->blocks,
312 data->sg_len, data->sg->length);
313
314 /* enter data reading mode */
315 sdricoh_writel(host, R21C_STATUS, 0x837f031e);
316 for (i = 0; i < data->blocks; i++) {
317 size_t len = data->blksz;
318 u8 *buf;
319 struct page *page;
320 int result;
321 page = sg_page(data->sg);
322
323 buf = kmap(page) + data->sg->offset + (len * i);
324 result =
325 sdricoh_blockio(host,
326 data->flags & MMC_DATA_READ, buf, len);
327 kunmap(page);
328 flush_dcache_page(page);
329 if (result) {
330 dev_err(dev, "sdricoh_request: cmd %i "
331 "block transfer failed\n", cmd->opcode);
332 cmd->error = result;
333 break;
334 } else
335 data->bytes_xfered += len;
336 }
337
338 sdricoh_writel(host, R208_DATAIO, 1);
339
340 if (sdricoh_query_status(host, STATUS_TRANSFER_FINISHED,
341 TRANSFER_TIMEOUT)) {
342 dev_err(dev, "sdricoh_request: transfer end error\n");
343 cmd->error = -EINVAL;
344 }
345 }
346 /* FIXME check busy flag */
347
348 mmc_request_done(mmc, mrq);
349 dev_dbg(dev, "=============================\n");
350}
351
352static void sdricoh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
353{
354 struct sdricoh_host *host = mmc_priv(mmc);
355 dev_dbg(host->dev, "set_ios\n");
356
357 if (ios->power_mode == MMC_POWER_ON) {
358 sdricoh_writel(host, R228_POWER, 0xc0e0);
359
360 if (ios->bus_width == MMC_BUS_WIDTH_4) {
361 sdricoh_writel(host, R224_MODE, 0x2000300);
362 sdricoh_writel(host, R228_POWER, 0x40e0);
363 } else {
364 sdricoh_writel(host, R224_MODE, 0x2000340);
365 }
366
367 } else if (ios->power_mode == MMC_POWER_UP) {
368 sdricoh_writel(host, R224_MODE, 0x2000320);
369 sdricoh_writel(host, R228_POWER, 0xe0);
370 }
371}
372
373static int sdricoh_get_ro(struct mmc_host *mmc)
374{
375 struct sdricoh_host *host = mmc_priv(mmc);
376 unsigned int status;
377
378 status = sdricoh_readl(host, R21C_STATUS);
379 sdricoh_writel(host, R2E4_STATUS_RESP, status);
380
381 /* some notebooks seem to have the locked flag switched */
382 if (switchlocked)
383 return !(status & STATUS_CARD_LOCKED);
384
385 return (status & STATUS_CARD_LOCKED);
386}
387
388static const struct mmc_host_ops sdricoh_ops = {
389 .request = sdricoh_request,
390 .set_ios = sdricoh_set_ios,
391 .get_ro = sdricoh_get_ro,
392};
393
394/* initialize the control and register it to the mmc framework */
395static int sdricoh_init_mmc(struct pci_dev *pci_dev,
396 struct pcmcia_device *pcmcia_dev)
397{
398 int result;
399 void __iomem *iobase;
400 struct mmc_host *mmc;
401 struct sdricoh_host *host;
402 struct device *dev = &pcmcia_dev->dev;
403 /* map iomem */
404 if (pci_resource_len(pci_dev, SDRICOH_PCI_REGION) !=
405 SDRICOH_PCI_REGION_SIZE) {
406 dev_dbg(dev, "unexpected pci resource len\n");
407 return -ENODEV;
408 }
409 iobase =
410 pci_iomap(pci_dev, SDRICOH_PCI_REGION, SDRICOH_PCI_REGION_SIZE);
411 if (!iobase) {
412 dev_err(dev, "unable to map iobase\n");
413 return -ENODEV;
414 }
415 /* check version? */
416 if (readl(iobase + R104_VERSION) != 0x4000) {
417 dev_dbg(dev, "no supported mmc controller found\n");
418 result = -ENODEV;
419 goto unmap_io;
420 }
421 /* allocate privdata */
422 mmc = pcmcia_dev->priv =
423 mmc_alloc_host(sizeof(struct sdricoh_host), &pcmcia_dev->dev);
424 if (!mmc) {
425 dev_err(dev, "mmc_alloc_host failed\n");
426 result = -ENOMEM;
427 goto unmap_io;
428 }
429 host = mmc_priv(mmc);
430
431 host->iobase = iobase;
432 host->dev = dev;
433 host->pci_dev = pci_dev;
434
435 mmc->ops = &sdricoh_ops;
436
437 /* FIXME: frequency and voltage handling is done by the controller
438 */
439 mmc->f_min = 450000;
440 mmc->f_max = 24000000;
441 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
442 mmc->caps |= MMC_CAP_4_BIT_DATA;
443
444 mmc->max_seg_size = 1024 * 512;
445 mmc->max_blk_size = 512;
446
447 /* reset the controller */
448 if (sdricoh_reset(host)) {
449 dev_dbg(dev, "could not reset\n");
450 result = -EIO;
451 goto free_host;
452 }
453
454 result = mmc_add_host(mmc);
455
456 if (!result) {
457 dev_dbg(dev, "mmc host registered\n");
458 return 0;
459 }
460free_host:
461 mmc_free_host(mmc);
462unmap_io:
463 pci_iounmap(pci_dev, iobase);
464 return result;
465}
466
467/* search for supported mmc controllers */
468static int sdricoh_pcmcia_probe(struct pcmcia_device *pcmcia_dev)
469{
470 struct pci_dev *pci_dev = NULL;
471
472 dev_info(&pcmcia_dev->dev, "Searching MMC controller for pcmcia device"
473 " %s %s ...\n", pcmcia_dev->prod_id[0], pcmcia_dev->prod_id[1]);
474
475 /* search pci cardbus bridge that contains the mmc controller */
476 /* the io region is already claimed by yenta_socket... */
477 while ((pci_dev =
478 pci_get_device(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476,
479 pci_dev))) {
480 /* try to init the device */
481 if (!sdricoh_init_mmc(pci_dev, pcmcia_dev)) {
482 dev_info(&pcmcia_dev->dev, "MMC controller found\n");
483 return 0;
484 }
485
486 }
487 dev_err(&pcmcia_dev->dev, "No MMC controller was found.\n");
488 return -ENODEV;
489}
490
491static void sdricoh_pcmcia_detach(struct pcmcia_device *link)
492{
493 struct mmc_host *mmc = link->priv;
494
495 dev_dbg(&link->dev, "detach\n");
496
497 /* remove mmc host */
498 if (mmc) {
499 struct sdricoh_host *host = mmc_priv(mmc);
500 mmc_remove_host(mmc);
501 pci_iounmap(host->pci_dev, host->iobase);
502 pci_dev_put(host->pci_dev);
503 mmc_free_host(mmc);
504 }
505 pcmcia_disable_device(link);
506
507}
508
509#ifdef CONFIG_PM
510static int sdricoh_pcmcia_suspend(struct pcmcia_device *link)
511{
512 dev_dbg(&link->dev, "suspend\n");
513 return 0;
514}
515
516static int sdricoh_pcmcia_resume(struct pcmcia_device *link)
517{
518 struct mmc_host *mmc = link->priv;
519 dev_dbg(&link->dev, "resume\n");
520 sdricoh_reset(mmc_priv(mmc));
521 return 0;
522}
523#else
524#define sdricoh_pcmcia_suspend NULL
525#define sdricoh_pcmcia_resume NULL
526#endif
527
528static struct pcmcia_driver sdricoh_driver = {
529 .name = DRIVER_NAME,
530 .probe = sdricoh_pcmcia_probe,
531 .remove = sdricoh_pcmcia_detach,
532 .id_table = pcmcia_ids,
533 .suspend = sdricoh_pcmcia_suspend,
534 .resume = sdricoh_pcmcia_resume,
535};
536module_pcmcia_driver(sdricoh_driver);
537
538module_param(switchlocked, uint, 0444);
539
540MODULE_AUTHOR("Sascha Sommer <saschasommer@freenet.de>");
541MODULE_DESCRIPTION("Ricoh PCMCIA Secure Digital Interface driver");
542MODULE_LICENSE("GPL");
543
544MODULE_PARM_DESC(switchlocked, "Switch the cards locked status."
545 "Use this when unlocked cards are shown readonly (default 0)");