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/mmc/host/wbsd.c

  1 /*
  2  *  linux/drivers/mmc/host/wbsd.c - Winbond W83L51xD SD/MMC driver
  3  *
  4  *  Copyright (C) 2004-2007 Pierre Ossman, All Rights Reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or (at
  9  * your option) any later version.
 10  *
 11  *
 12  * Warning!
 13  *
 14  * Changes to the FIFO system should be done with extreme care since
 15  * the hardware is full of bugs related to the FIFO. Known issues are:
 16  *
 17  * - FIFO size field in FSR is always zero.
 18  *
 19  * - FIFO interrupts tend not to work as they should. Interrupts are
 20  *   triggered only for full/empty events, not for threshold values.
 21  *
 22  * - On APIC systems the FIFO empty interrupt is sometimes lost.
 23  */
 24 
 25 #include <linux/module.h>
 26 #include <linux/moduleparam.h>
 27 #include <linux/init.h>
 28 #include <linux/ioport.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/interrupt.h>
 31 #include <linux/dma-mapping.h>
 32 #include <linux/delay.h>
 33 #include <linux/pnp.h>
 34 #include <linux/highmem.h>
 35 #include <linux/mmc/host.h>
 36 #include <linux/scatterlist.h>
 37 #include <linux/slab.h>
 38 
 39 #include <asm/io.h>
 40 #include <asm/dma.h>
 41 
 42 #include "wbsd.h"
 43 
 44 #define DRIVER_NAME "wbsd"
 45 
 46 #define DBG(x...) \
 47         pr_debug(DRIVER_NAME ": " x)
 48 #define DBGF(f, x...) \
 49         pr_debug(DRIVER_NAME " [%s()]: " f, __func__ , ##x)
 50 
 51 /*
 52  * Device resources
 53  */
 54 
 55 #ifdef CONFIG_PNP
 56 
 57 static const struct pnp_device_id pnp_dev_table[] = {
 58         { "WEC0517", 0 },
 59         { "WEC0518", 0 },
 60         { "", 0 },
 61 };
 62 
 63 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
 64 
 65 #endif /* CONFIG_PNP */
 66 
 67 static const int config_ports[] = { 0x2E, 0x4E };
 68 static const int unlock_codes[] = { 0x83, 0x87 };
 69 
 70 static const int valid_ids[] = {
 71         0x7112,
 72 };
 73 
 74 #ifdef CONFIG_PNP
 75 static unsigned int param_nopnp = 0;
 76 #else
 77 static const unsigned int param_nopnp = 1;
 78 #endif
 79 static unsigned int param_io = 0x248;
 80 static unsigned int param_irq = 6;
 81 static int param_dma = 2;
 82 
 83 /*
 84  * Basic functions
 85  */
 86 
 87 static inline void wbsd_unlock_config(struct wbsd_host *host)
 88 {
 89         BUG_ON(host->config == 0);
 90 
 91         outb(host->unlock_code, host->config);
 92         outb(host->unlock_code, host->config);
 93 }
 94 
 95 static inline void wbsd_lock_config(struct wbsd_host *host)
 96 {
 97         BUG_ON(host->config == 0);
 98 
 99         outb(LOCK_CODE, host->config);
100 }
101 
102 static inline void wbsd_write_config(struct wbsd_host *host, u8 reg, u8 value)
103 {
104         BUG_ON(host->config == 0);
105 
106         outb(reg, host->config);
107         outb(value, host->config + 1);
108 }
109 
110 static inline u8 wbsd_read_config(struct wbsd_host *host, u8 reg)
111 {
112         BUG_ON(host->config == 0);
113 
114         outb(reg, host->config);
115         return inb(host->config + 1);
116 }
117 
118 static inline void wbsd_write_index(struct wbsd_host *host, u8 index, u8 value)
119 {
120         outb(index, host->base + WBSD_IDXR);
121         outb(value, host->base + WBSD_DATAR);
122 }
123 
124 static inline u8 wbsd_read_index(struct wbsd_host *host, u8 index)
125 {
126         outb(index, host->base + WBSD_IDXR);
127         return inb(host->base + WBSD_DATAR);
128 }
129 
130 /*
131  * Common routines
132  */
133 
134 static void wbsd_init_device(struct wbsd_host *host)
135 {
136         u8 setup, ier;
137 
138         /*
139          * Reset chip (SD/MMC part) and fifo.
140          */
141         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
142         setup |= WBSD_FIFO_RESET | WBSD_SOFT_RESET;
143         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
144 
145         /*
146          * Set DAT3 to input
147          */
148         setup &= ~WBSD_DAT3_H;
149         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
150         host->flags &= ~WBSD_FIGNORE_DETECT;
151 
152         /*
153          * Read back default clock.
154          */
155         host->clk = wbsd_read_index(host, WBSD_IDX_CLK);
156 
157         /*
158          * Power down port.
159          */
160         outb(WBSD_POWER_N, host->base + WBSD_CSR);
161 
162         /*
163          * Set maximum timeout.
164          */
165         wbsd_write_index(host, WBSD_IDX_TAAC, 0x7F);
166 
167         /*
168          * Test for card presence
169          */
170         if (inb(host->base + WBSD_CSR) & WBSD_CARDPRESENT)
171                 host->flags |= WBSD_FCARD_PRESENT;
172         else
173                 host->flags &= ~WBSD_FCARD_PRESENT;
174 
175         /*
176          * Enable interesting interrupts.
177          */
178         ier = 0;
179         ier |= WBSD_EINT_CARD;
180         ier |= WBSD_EINT_FIFO_THRE;
181         ier |= WBSD_EINT_CRC;
182         ier |= WBSD_EINT_TIMEOUT;
183         ier |= WBSD_EINT_TC;
184 
185         outb(ier, host->base + WBSD_EIR);
186 
187         /*
188          * Clear interrupts.
189          */
190         inb(host->base + WBSD_ISR);
191 }
192 
193 static void wbsd_reset(struct wbsd_host *host)
194 {
195         u8 setup;
196 
197         pr_err("%s: Resetting chip\n", mmc_hostname(host->mmc));
198 
199         /*
200          * Soft reset of chip (SD/MMC part).
201          */
202         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
203         setup |= WBSD_SOFT_RESET;
204         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
205 }
206 
207 static void wbsd_request_end(struct wbsd_host *host, struct mmc_request *mrq)
208 {
209         unsigned long dmaflags;
210 
211         if (host->dma >= 0) {
212                 /*
213                  * Release ISA DMA controller.
214                  */
215                 dmaflags = claim_dma_lock();
216                 disable_dma(host->dma);
217                 clear_dma_ff(host->dma);
218                 release_dma_lock(dmaflags);
219 
220                 /*
221                  * Disable DMA on host.
222                  */
223                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
224         }
225 
226         host->mrq = NULL;
227 
228         /*
229          * MMC layer might call back into the driver so first unlock.
230          */
231         spin_unlock(&host->lock);
232         mmc_request_done(host->mmc, mrq);
233         spin_lock(&host->lock);
234 }
235 
236 /*
237  * Scatter/gather functions
238  */
239 
240 static inline void wbsd_init_sg(struct wbsd_host *host, struct mmc_data *data)
241 {
242         /*
243          * Get info. about SG list from data structure.
244          */
245         host->cur_sg = data->sg;
246         host->num_sg = data->sg_len;
247 
248         host->offset = 0;
249         host->remain = host->cur_sg->length;
250 }
251 
252 static inline int wbsd_next_sg(struct wbsd_host *host)
253 {
254         /*
255          * Skip to next SG entry.
256          */
257         host->cur_sg++;
258         host->num_sg--;
259 
260         /*
261          * Any entries left?
262          */
263         if (host->num_sg > 0) {
264                 host->offset = 0;
265                 host->remain = host->cur_sg->length;
266         }
267 
268         return host->num_sg;
269 }
270 
271 static inline char *wbsd_sg_to_buffer(struct wbsd_host *host)
272 {
273         return sg_virt(host->cur_sg);
274 }
275 
276 static inline void wbsd_sg_to_dma(struct wbsd_host *host, struct mmc_data *data)
277 {
278         unsigned int len, i;
279         struct scatterlist *sg;
280         char *dmabuf = host->dma_buffer;
281         char *sgbuf;
282 
283         sg = data->sg;
284         len = data->sg_len;
285 
286         for (i = 0; i < len; i++) {
287                 sgbuf = sg_virt(&sg[i]);
288                 memcpy(dmabuf, sgbuf, sg[i].length);
289                 dmabuf += sg[i].length;
290         }
291 }
292 
293 static inline void wbsd_dma_to_sg(struct wbsd_host *host, struct mmc_data *data)
294 {
295         unsigned int len, i;
296         struct scatterlist *sg;
297         char *dmabuf = host->dma_buffer;
298         char *sgbuf;
299 
300         sg = data->sg;
301         len = data->sg_len;
302 
303         for (i = 0; i < len; i++) {
304                 sgbuf = sg_virt(&sg[i]);
305                 memcpy(sgbuf, dmabuf, sg[i].length);
306                 dmabuf += sg[i].length;
307         }
308 }
309 
310 /*
311  * Command handling
312  */
313 
314 static inline void wbsd_get_short_reply(struct wbsd_host *host,
315                                         struct mmc_command *cmd)
316 {
317         /*
318          * Correct response type?
319          */
320         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_SHORT) {
321                 cmd->error = -EILSEQ;
322                 return;
323         }
324 
325         cmd->resp[0]  = wbsd_read_index(host, WBSD_IDX_RESP12) << 24;
326         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP13) << 16;
327         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP14) << 8;
328         cmd->resp[0] |= wbsd_read_index(host, WBSD_IDX_RESP15) << 0;
329         cmd->resp[1]  = wbsd_read_index(host, WBSD_IDX_RESP16) << 24;
330 }
331 
332 static inline void wbsd_get_long_reply(struct wbsd_host *host,
333         struct mmc_command *cmd)
334 {
335         int i;
336 
337         /*
338          * Correct response type?
339          */
340         if (wbsd_read_index(host, WBSD_IDX_RSPLEN) != WBSD_RSP_LONG) {
341                 cmd->error = -EILSEQ;
342                 return;
343         }
344 
345         for (i = 0; i < 4; i++) {
346                 cmd->resp[i] =
347                         wbsd_read_index(host, WBSD_IDX_RESP1 + i * 4) << 24;
348                 cmd->resp[i] |=
349                         wbsd_read_index(host, WBSD_IDX_RESP2 + i * 4) << 16;
350                 cmd->resp[i] |=
351                         wbsd_read_index(host, WBSD_IDX_RESP3 + i * 4) << 8;
352                 cmd->resp[i] |=
353                         wbsd_read_index(host, WBSD_IDX_RESP4 + i * 4) << 0;
354         }
355 }
356 
357 static void wbsd_send_command(struct wbsd_host *host, struct mmc_command *cmd)
358 {
359         int i;
360         u8 status, isr;
361 
362         /*
363          * Clear accumulated ISR. The interrupt routine
364          * will fill this one with events that occur during
365          * transfer.
366          */
367         host->isr = 0;
368 
369         /*
370          * Send the command (CRC calculated by host).
371          */
372         outb(cmd->opcode, host->base + WBSD_CMDR);
373         for (i = 3; i >= 0; i--)
374                 outb((cmd->arg >> (i * 8)) & 0xff, host->base + WBSD_CMDR);
375 
376         cmd->error = 0;
377 
378         /*
379          * Wait for the request to complete.
380          */
381         do {
382                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
383         } while (status & WBSD_CARDTRAFFIC);
384 
385         /*
386          * Do we expect a reply?
387          */
388         if (cmd->flags & MMC_RSP_PRESENT) {
389                 /*
390                  * Read back status.
391                  */
392                 isr = host->isr;
393 
394                 /* Card removed? */
395                 if (isr & WBSD_INT_CARD)
396                         cmd->error = -ENOMEDIUM;
397                 /* Timeout? */
398                 else if (isr & WBSD_INT_TIMEOUT)
399                         cmd->error = -ETIMEDOUT;
400                 /* CRC? */
401                 else if ((cmd->flags & MMC_RSP_CRC) && (isr & WBSD_INT_CRC))
402                         cmd->error = -EILSEQ;
403                 /* All ok */
404                 else {
405                         if (cmd->flags & MMC_RSP_136)
406                                 wbsd_get_long_reply(host, cmd);
407                         else
408                                 wbsd_get_short_reply(host, cmd);
409                 }
410         }
411 }
412 
413 /*
414  * Data functions
415  */
416 
417 static void wbsd_empty_fifo(struct wbsd_host *host)
418 {
419         struct mmc_data *data = host->mrq->cmd->data;
420         char *buffer;
421         int i, fsr, fifo;
422 
423         /*
424          * Handle excessive data.
425          */
426         if (host->num_sg == 0)
427                 return;
428 
429         buffer = wbsd_sg_to_buffer(host) + host->offset;
430 
431         /*
432          * Drain the fifo. This has a tendency to loop longer
433          * than the FIFO length (usually one block).
434          */
435         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_EMPTY)) {
436                 /*
437                  * The size field in the FSR is broken so we have to
438                  * do some guessing.
439                  */
440                 if (fsr & WBSD_FIFO_FULL)
441                         fifo = 16;
442                 else if (fsr & WBSD_FIFO_FUTHRE)
443                         fifo = 8;
444                 else
445                         fifo = 1;
446 
447                 for (i = 0; i < fifo; i++) {
448                         *buffer = inb(host->base + WBSD_DFR);
449                         buffer++;
450                         host->offset++;
451                         host->remain--;
452 
453                         data->bytes_xfered++;
454 
455                         /*
456                          * End of scatter list entry?
457                          */
458                         if (host->remain == 0) {
459                                 /*
460                                  * Get next entry. Check if last.
461                                  */
462                                 if (!wbsd_next_sg(host))
463                                         return;
464 
465                                 buffer = wbsd_sg_to_buffer(host);
466                         }
467                 }
468         }
469 
470         /*
471          * This is a very dirty hack to solve a
472          * hardware problem. The chip doesn't trigger
473          * FIFO threshold interrupts properly.
474          */
475         if ((data->blocks * data->blksz - data->bytes_xfered) < 16)
476                 tasklet_schedule(&host->fifo_tasklet);
477 }
478 
479 static void wbsd_fill_fifo(struct wbsd_host *host)
480 {
481         struct mmc_data *data = host->mrq->cmd->data;
482         char *buffer;
483         int i, fsr, fifo;
484 
485         /*
486          * Check that we aren't being called after the
487          * entire buffer has been transferred.
488          */
489         if (host->num_sg == 0)
490                 return;
491 
492         buffer = wbsd_sg_to_buffer(host) + host->offset;
493 
494         /*
495          * Fill the fifo. This has a tendency to loop longer
496          * than the FIFO length (usually one block).
497          */
498         while (!((fsr = inb(host->base + WBSD_FSR)) & WBSD_FIFO_FULL)) {
499                 /*
500                  * The size field in the FSR is broken so we have to
501                  * do some guessing.
502                  */
503                 if (fsr & WBSD_FIFO_EMPTY)
504                         fifo = 0;
505                 else if (fsr & WBSD_FIFO_EMTHRE)
506                         fifo = 8;
507                 else
508                         fifo = 15;
509 
510                 for (i = 16; i > fifo; i--) {
511                         outb(*buffer, host->base + WBSD_DFR);
512                         buffer++;
513                         host->offset++;
514                         host->remain--;
515 
516                         data->bytes_xfered++;
517 
518                         /*
519                          * End of scatter list entry?
520                          */
521                         if (host->remain == 0) {
522                                 /*
523                                  * Get next entry. Check if last.
524                                  */
525                                 if (!wbsd_next_sg(host))
526                                         return;
527 
528                                 buffer = wbsd_sg_to_buffer(host);
529                         }
530                 }
531         }
532 
533         /*
534          * The controller stops sending interrupts for
535          * 'FIFO empty' under certain conditions. So we
536          * need to be a bit more pro-active.
537          */
538         tasklet_schedule(&host->fifo_tasklet);
539 }
540 
541 static void wbsd_prepare_data(struct wbsd_host *host, struct mmc_data *data)
542 {
543         u16 blksize;
544         u8 setup;
545         unsigned long dmaflags;
546         unsigned int size;
547 
548         /*
549          * Calculate size.
550          */
551         size = data->blocks * data->blksz;
552 
553         /*
554          * Check timeout values for overflow.
555          * (Yes, some cards cause this value to overflow).
556          */
557         if (data->timeout_ns > 127000000)
558                 wbsd_write_index(host, WBSD_IDX_TAAC, 127);
559         else {
560                 wbsd_write_index(host, WBSD_IDX_TAAC,
561                         data->timeout_ns / 1000000);
562         }
563 
564         if (data->timeout_clks > 255)
565                 wbsd_write_index(host, WBSD_IDX_NSAC, 255);
566         else
567                 wbsd_write_index(host, WBSD_IDX_NSAC, data->timeout_clks);
568 
569         /*
570          * Inform the chip of how large blocks will be
571          * sent. It needs this to determine when to
572          * calculate CRC.
573          *
574          * Space for CRC must be included in the size.
575          * Two bytes are needed for each data line.
576          */
577         if (host->bus_width == MMC_BUS_WIDTH_1) {
578                 blksize = data->blksz + 2;
579 
580                 wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
581                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
582         } else if (host->bus_width == MMC_BUS_WIDTH_4) {
583                 blksize = data->blksz + 2 * 4;
584 
585                 wbsd_write_index(host, WBSD_IDX_PBSMSB,
586                         ((blksize >> 4) & 0xF0) | WBSD_DATA_WIDTH);
587                 wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
588         } else {
589                 data->error = -EINVAL;
590                 return;
591         }
592 
593         /*
594          * Clear the FIFO. This is needed even for DMA
595          * transfers since the chip still uses the FIFO
596          * internally.
597          */
598         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
599         setup |= WBSD_FIFO_RESET;
600         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
601 
602         /*
603          * DMA transfer?
604          */
605         if (host->dma >= 0) {
606                 /*
607                  * The buffer for DMA is only 64 kB.
608                  */
609                 BUG_ON(size > 0x10000);
610                 if (size > 0x10000) {
611                         data->error = -EINVAL;
612                         return;
613                 }
614 
615                 /*
616                  * Transfer data from the SG list to
617                  * the DMA buffer.
618                  */
619                 if (data->flags & MMC_DATA_WRITE)
620                         wbsd_sg_to_dma(host, data);
621 
622                 /*
623                  * Initialise the ISA DMA controller.
624                  */
625                 dmaflags = claim_dma_lock();
626                 disable_dma(host->dma);
627                 clear_dma_ff(host->dma);
628                 if (data->flags & MMC_DATA_READ)
629                         set_dma_mode(host->dma, DMA_MODE_READ & ~0x40);
630                 else
631                         set_dma_mode(host->dma, DMA_MODE_WRITE & ~0x40);
632                 set_dma_addr(host->dma, host->dma_addr);
633                 set_dma_count(host->dma, size);
634 
635                 enable_dma(host->dma);
636                 release_dma_lock(dmaflags);
637 
638                 /*
639                  * Enable DMA on the host.
640                  */
641                 wbsd_write_index(host, WBSD_IDX_DMA, WBSD_DMA_ENABLE);
642         } else {
643                 /*
644                  * This flag is used to keep printk
645                  * output to a minimum.
646                  */
647                 host->firsterr = 1;
648 
649                 /*
650                  * Initialise the SG list.
651                  */
652                 wbsd_init_sg(host, data);
653 
654                 /*
655                  * Turn off DMA.
656                  */
657                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
658 
659                 /*
660                  * Set up FIFO threshold levels (and fill
661                  * buffer if doing a write).
662                  */
663                 if (data->flags & MMC_DATA_READ) {
664                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
665                                 WBSD_FIFOEN_FULL | 8);
666                 } else {
667                         wbsd_write_index(host, WBSD_IDX_FIFOEN,
668                                 WBSD_FIFOEN_EMPTY | 8);
669                         wbsd_fill_fifo(host);
670                 }
671         }
672 
673         data->error = 0;
674 }
675 
676 static void wbsd_finish_data(struct wbsd_host *host, struct mmc_data *data)
677 {
678         unsigned long dmaflags;
679         int count;
680         u8 status;
681 
682         WARN_ON(host->mrq == NULL);
683 
684         /*
685          * Send a stop command if needed.
686          */
687         if (data->stop)
688                 wbsd_send_command(host, data->stop);
689 
690         /*
691          * Wait for the controller to leave data
692          * transfer state.
693          */
694         do {
695                 status = wbsd_read_index(host, WBSD_IDX_STATUS);
696         } while (status & (WBSD_BLOCK_READ | WBSD_BLOCK_WRITE));
697 
698         /*
699          * DMA transfer?
700          */
701         if (host->dma >= 0) {
702                 /*
703                  * Disable DMA on the host.
704                  */
705                 wbsd_write_index(host, WBSD_IDX_DMA, 0);
706 
707                 /*
708                  * Turn of ISA DMA controller.
709                  */
710                 dmaflags = claim_dma_lock();
711                 disable_dma(host->dma);
712                 clear_dma_ff(host->dma);
713                 count = get_dma_residue(host->dma);
714                 release_dma_lock(dmaflags);
715 
716                 data->bytes_xfered = host->mrq->data->blocks *
717                         host->mrq->data->blksz - count;
718                 data->bytes_xfered -= data->bytes_xfered % data->blksz;
719 
720                 /*
721                  * Any leftover data?
722                  */
723                 if (count) {
724                         pr_err("%s: Incomplete DMA transfer. "
725                                 "%d bytes left.\n",
726                                 mmc_hostname(host->mmc), count);
727 
728                         if (!data->error)
729                                 data->error = -EIO;
730                 } else {
731                         /*
732                          * Transfer data from DMA buffer to
733                          * SG list.
734                          */
735                         if (data->flags & MMC_DATA_READ)
736                                 wbsd_dma_to_sg(host, data);
737                 }
738 
739                 if (data->error) {
740                         if (data->bytes_xfered)
741                                 data->bytes_xfered -= data->blksz;
742                 }
743         }
744 
745         wbsd_request_end(host, host->mrq);
746 }
747 
748 /*****************************************************************************\
749  *                                                                           *
750  * MMC layer callbacks                                                       *
751  *                                                                           *
752 \*****************************************************************************/
753 
754 static void wbsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
755 {
756         struct wbsd_host *host = mmc_priv(mmc);
757         struct mmc_command *cmd;
758 
759         /*
760          * Disable tasklets to avoid a deadlock.
761          */
762         spin_lock_bh(&host->lock);
763 
764         BUG_ON(host->mrq != NULL);
765 
766         cmd = mrq->cmd;
767 
768         host->mrq = mrq;
769 
770         /*
771          * Check that there is actually a card in the slot.
772          */
773         if (!(host->flags & WBSD_FCARD_PRESENT)) {
774                 cmd->error = -ENOMEDIUM;
775                 goto done;
776         }
777 
778         if (cmd->data) {
779                 /*
780                  * The hardware is so delightfully stupid that it has a list
781                  * of "data" commands. If a command isn't on this list, it'll
782                  * just go back to the idle state and won't send any data
783                  * interrupts.
784                  */
785                 switch (cmd->opcode) {
786                 case 11:
787                 case 17:
788                 case 18:
789                 case 20:
790                 case 24:
791                 case 25:
792                 case 26:
793                 case 27:
794                 case 30:
795                 case 42:
796                 case 56:
797                         break;
798 
799                 /* ACMDs. We don't keep track of state, so we just treat them
800                  * like any other command. */
801                 case 51:
802                         break;
803 
804                 default:
805 #ifdef CONFIG_MMC_DEBUG
806                         pr_warning("%s: Data command %d is not "
807                                 "supported by this controller.\n",
808                                 mmc_hostname(host->mmc), cmd->opcode);
809 #endif
810                         cmd->error = -EINVAL;
811 
812                         goto done;
813                 };
814         }
815 
816         /*
817          * Does the request include data?
818          */
819         if (cmd->data) {
820                 wbsd_prepare_data(host, cmd->data);
821 
822                 if (cmd->data->error)
823                         goto done;
824         }
825 
826         wbsd_send_command(host, cmd);
827 
828         /*
829          * If this is a data transfer the request
830          * will be finished after the data has
831          * transferred.
832          */
833         if (cmd->data && !cmd->error) {
834                 /*
835                  * Dirty fix for hardware bug.
836                  */
837                 if (host->dma == -1)
838                         tasklet_schedule(&host->fifo_tasklet);
839 
840                 spin_unlock_bh(&host->lock);
841 
842                 return;
843         }
844 
845 done:
846         wbsd_request_end(host, mrq);
847 
848         spin_unlock_bh(&host->lock);
849 }
850 
851 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
852 {
853         struct wbsd_host *host = mmc_priv(mmc);
854         u8 clk, setup, pwr;
855 
856         spin_lock_bh(&host->lock);
857 
858         /*
859          * Reset the chip on each power off.
860          * Should clear out any weird states.
861          */
862         if (ios->power_mode == MMC_POWER_OFF)
863                 wbsd_init_device(host);
864 
865         if (ios->clock >= 24000000)
866                 clk = WBSD_CLK_24M;
867         else if (ios->clock >= 16000000)
868                 clk = WBSD_CLK_16M;
869         else if (ios->clock >= 12000000)
870                 clk = WBSD_CLK_12M;
871         else
872                 clk = WBSD_CLK_375K;
873 
874         /*
875          * Only write to the clock register when
876          * there is an actual change.
877          */
878         if (clk != host->clk) {
879                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
880                 host->clk = clk;
881         }
882 
883         /*
884          * Power up card.
885          */
886         if (ios->power_mode != MMC_POWER_OFF) {
887                 pwr = inb(host->base + WBSD_CSR);
888                 pwr &= ~WBSD_POWER_N;
889                 outb(pwr, host->base + WBSD_CSR);
890         }
891 
892         /*
893          * MMC cards need to have pin 1 high during init.
894          * It wreaks havoc with the card detection though so
895          * that needs to be disabled.
896          */
897         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
898         if (ios->chip_select == MMC_CS_HIGH) {
899                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
900                 setup |= WBSD_DAT3_H;
901                 host->flags |= WBSD_FIGNORE_DETECT;
902         } else {
903                 if (setup & WBSD_DAT3_H) {
904                         setup &= ~WBSD_DAT3_H;
905 
906                         /*
907                          * We cannot resume card detection immediately
908                          * because of capacitance and delays in the chip.
909                          */
910                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
911                 }
912         }
913         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
914 
915         /*
916          * Store bus width for later. Will be used when
917          * setting up the data transfer.
918          */
919         host->bus_width = ios->bus_width;
920 
921         spin_unlock_bh(&host->lock);
922 }
923 
924 static int wbsd_get_ro(struct mmc_host *mmc)
925 {
926         struct wbsd_host *host = mmc_priv(mmc);
927         u8 csr;
928 
929         spin_lock_bh(&host->lock);
930 
931         csr = inb(host->base + WBSD_CSR);
932         csr |= WBSD_MSLED;
933         outb(csr, host->base + WBSD_CSR);
934 
935         mdelay(1);
936 
937         csr = inb(host->base + WBSD_CSR);
938         csr &= ~WBSD_MSLED;
939         outb(csr, host->base + WBSD_CSR);
940 
941         spin_unlock_bh(&host->lock);
942 
943         return !!(csr & WBSD_WRPT);
944 }
945 
946 static const struct mmc_host_ops wbsd_ops = {
947         .request        = wbsd_request,
948         .set_ios        = wbsd_set_ios,
949         .get_ro         = wbsd_get_ro,
950 };
951 
952 /*****************************************************************************\
953  *                                                                           *
954  * Interrupt handling                                                        *
955  *                                                                           *
956 \*****************************************************************************/
957 
958 /*
959  * Helper function to reset detection ignore
960  */
961 
962 static void wbsd_reset_ignore(unsigned long data)
963 {
964         struct wbsd_host *host = (struct wbsd_host *)data;
965 
966         BUG_ON(host == NULL);
967 
968         DBG("Resetting card detection ignore\n");
969 
970         spin_lock_bh(&host->lock);
971 
972         host->flags &= ~WBSD_FIGNORE_DETECT;
973 
974         /*
975          * Card status might have changed during the
976          * blackout.
977          */
978         tasklet_schedule(&host->card_tasklet);
979 
980         spin_unlock_bh(&host->lock);
981 }
982 
983 /*
984  * Tasklets
985  */
986 
987 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
988 {
989         WARN_ON(!host->mrq);
990         if (!host->mrq)
991                 return NULL;
992 
993         WARN_ON(!host->mrq->cmd);
994         if (!host->mrq->cmd)
995                 return NULL;
996 
997         WARN_ON(!host->mrq->cmd->data);
998         if (!host->mrq->cmd->data)
999                 return NULL;
1000 
1001         return host->mrq->cmd->data;
1002 }
1003 
1004 static void wbsd_tasklet_card(unsigned long param)
1005 {
1006         struct wbsd_host *host = (struct wbsd_host *)param;
1007         u8 csr;
1008         int delay = -1;
1009 
1010         spin_lock(&host->lock);
1011 
1012         if (host->flags & WBSD_FIGNORE_DETECT) {
1013                 spin_unlock(&host->lock);
1014                 return;
1015         }
1016 
1017         csr = inb(host->base + WBSD_CSR);
1018         WARN_ON(csr == 0xff);
1019 
1020         if (csr & WBSD_CARDPRESENT) {
1021                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1022                         DBG("Card inserted\n");
1023                         host->flags |= WBSD_FCARD_PRESENT;
1024 
1025                         delay = 500;
1026                 }
1027         } else if (host->flags & WBSD_FCARD_PRESENT) {
1028                 DBG("Card removed\n");
1029                 host->flags &= ~WBSD_FCARD_PRESENT;
1030 
1031                 if (host->mrq) {
1032                         pr_err("%s: Card removed during transfer!\n",
1033                                 mmc_hostname(host->mmc));
1034                         wbsd_reset(host);
1035 
1036                         host->mrq->cmd->error = -ENOMEDIUM;
1037                         tasklet_schedule(&host->finish_tasklet);
1038                 }
1039 
1040                 delay = 0;
1041         }
1042 
1043         /*
1044          * Unlock first since we might get a call back.
1045          */
1046 
1047         spin_unlock(&host->lock);
1048 
1049         if (delay != -1)
1050                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1051 }
1052 
1053 static void wbsd_tasklet_fifo(unsigned long param)
1054 {
1055         struct wbsd_host *host = (struct wbsd_host *)param;
1056         struct mmc_data *data;
1057 
1058         spin_lock(&host->lock);
1059 
1060         if (!host->mrq)
1061                 goto end;
1062 
1063         data = wbsd_get_data(host);
1064         if (!data)
1065                 goto end;
1066 
1067         if (data->flags & MMC_DATA_WRITE)
1068                 wbsd_fill_fifo(host);
1069         else
1070                 wbsd_empty_fifo(host);
1071 
1072         /*
1073          * Done?
1074          */
1075         if (host->num_sg == 0) {
1076                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1077                 tasklet_schedule(&host->finish_tasklet);
1078         }
1079 
1080 end:
1081         spin_unlock(&host->lock);
1082 }
1083 
1084 static void wbsd_tasklet_crc(unsigned long param)
1085 {
1086         struct wbsd_host *host = (struct wbsd_host *)param;
1087         struct mmc_data *data;
1088 
1089         spin_lock(&host->lock);
1090 
1091         if (!host->mrq)
1092                 goto end;
1093 
1094         data = wbsd_get_data(host);
1095         if (!data)
1096                 goto end;
1097 
1098         DBGF("CRC error\n");
1099 
1100         data->error = -EILSEQ;
1101 
1102         tasklet_schedule(&host->finish_tasklet);
1103 
1104 end:
1105         spin_unlock(&host->lock);
1106 }
1107 
1108 static void wbsd_tasklet_timeout(unsigned long param)
1109 {
1110         struct wbsd_host *host = (struct wbsd_host *)param;
1111         struct mmc_data *data;
1112 
1113         spin_lock(&host->lock);
1114 
1115         if (!host->mrq)
1116                 goto end;
1117 
1118         data = wbsd_get_data(host);
1119         if (!data)
1120                 goto end;
1121 
1122         DBGF("Timeout\n");
1123 
1124         data->error = -ETIMEDOUT;
1125 
1126         tasklet_schedule(&host->finish_tasklet);
1127 
1128 end:
1129         spin_unlock(&host->lock);
1130 }
1131 
1132 static void wbsd_tasklet_finish(unsigned long param)
1133 {
1134         struct wbsd_host *host = (struct wbsd_host *)param;
1135         struct mmc_data *data;
1136 
1137         spin_lock(&host->lock);
1138 
1139         WARN_ON(!host->mrq);
1140         if (!host->mrq)
1141                 goto end;
1142 
1143         data = wbsd_get_data(host);
1144         if (!data)
1145                 goto end;
1146 
1147         wbsd_finish_data(host, data);
1148 
1149 end:
1150         spin_unlock(&host->lock);
1151 }
1152 
1153 /*
1154  * Interrupt handling
1155  */
1156 
1157 static irqreturn_t wbsd_irq(int irq, void *dev_id)
1158 {
1159         struct wbsd_host *host = dev_id;
1160         int isr;
1161 
1162         isr = inb(host->base + WBSD_ISR);
1163 
1164         /*
1165          * Was it actually our hardware that caused the interrupt?
1166          */
1167         if (isr == 0xff || isr == 0x00)
1168                 return IRQ_NONE;
1169 
1170         host->isr |= isr;
1171 
1172         /*
1173          * Schedule tasklets as needed.
1174          */
1175         if (isr & WBSD_INT_CARD)
1176                 tasklet_schedule(&host->card_tasklet);
1177         if (isr & WBSD_INT_FIFO_THRE)
1178                 tasklet_schedule(&host->fifo_tasklet);
1179         if (isr & WBSD_INT_CRC)
1180                 tasklet_hi_schedule(&host->crc_tasklet);
1181         if (isr & WBSD_INT_TIMEOUT)
1182                 tasklet_hi_schedule(&host->timeout_tasklet);
1183         if (isr & WBSD_INT_TC)
1184                 tasklet_schedule(&host->finish_tasklet);
1185 
1186         return IRQ_HANDLED;
1187 }
1188 
1189 /*****************************************************************************\
1190  *                                                                           *
1191  * Device initialisation and shutdown                                        *
1192  *                                                                           *
1193 \*****************************************************************************/
1194 
1195 /*
1196  * Allocate/free MMC structure.
1197  */
1198 
1199 static int wbsd_alloc_mmc(struct device *dev)
1200 {
1201         struct mmc_host *mmc;
1202         struct wbsd_host *host;
1203 
1204         /*
1205          * Allocate MMC structure.
1206          */
1207         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1208         if (!mmc)
1209                 return -ENOMEM;
1210 
1211         host = mmc_priv(mmc);
1212         host->mmc = mmc;
1213 
1214         host->dma = -1;
1215 
1216         /*
1217          * Set host parameters.
1218          */
1219         mmc->ops = &wbsd_ops;
1220         mmc->f_min = 375000;
1221         mmc->f_max = 24000000;
1222         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1223         mmc->caps = MMC_CAP_4_BIT_DATA;
1224 
1225         spin_lock_init(&host->lock);
1226 
1227         /*
1228          * Set up timers
1229          */
1230         init_timer(&host->ignore_timer);
1231         host->ignore_timer.data = (unsigned long)host;
1232         host->ignore_timer.function = wbsd_reset_ignore;
1233 
1234         /*
1235          * Maximum number of segments. Worst case is one sector per segment
1236          * so this will be 64kB/512.
1237          */
1238         mmc->max_segs = 128;
1239 
1240         /*
1241          * Maximum request size. Also limited by 64KiB buffer.
1242          */
1243         mmc->max_req_size = 65536;
1244 
1245         /*
1246          * Maximum segment size. Could be one segment with the maximum number
1247          * of bytes.
1248          */
1249         mmc->max_seg_size = mmc->max_req_size;
1250 
1251         /*
1252          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1253          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1254          */
1255         mmc->max_blk_size = 4087;
1256 
1257         /*
1258          * Maximum block count. There is no real limit so the maximum
1259          * request size will be the only restriction.
1260          */
1261         mmc->max_blk_count = mmc->max_req_size;
1262 
1263         dev_set_drvdata(dev, mmc);
1264 
1265         return 0;
1266 }
1267 
1268 static void wbsd_free_mmc(struct device *dev)
1269 {
1270         struct mmc_host *mmc;
1271         struct wbsd_host *host;
1272 
1273         mmc = dev_get_drvdata(dev);
1274         if (!mmc)
1275                 return;
1276 
1277         host = mmc_priv(mmc);
1278         BUG_ON(host == NULL);
1279 
1280         del_timer_sync(&host->ignore_timer);
1281 
1282         mmc_free_host(mmc);
1283 
1284         dev_set_drvdata(dev, NULL);
1285 }
1286 
1287 /*
1288  * Scan for known chip id:s
1289  */
1290 
1291 static int wbsd_scan(struct wbsd_host *host)
1292 {
1293         int i, j, k;
1294         int id;
1295 
1296         /*
1297          * Iterate through all ports, all codes to
1298          * find hardware that is in our known list.
1299          */
1300         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1301                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1302                         continue;
1303 
1304                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1305                         id = 0xFFFF;
1306 
1307                         host->config = config_ports[i];
1308                         host->unlock_code = unlock_codes[j];
1309 
1310                         wbsd_unlock_config(host);
1311 
1312                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1313                         id = inb(config_ports[i] + 1) << 8;
1314 
1315                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1316                         id |= inb(config_ports[i] + 1);
1317 
1318                         wbsd_lock_config(host);
1319 
1320                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1321                                 if (id == valid_ids[k]) {
1322                                         host->chip_id = id;
1323 
1324                                         return 0;
1325                                 }
1326                         }
1327 
1328                         if (id != 0xFFFF) {
1329                                 DBG("Unknown hardware (id %x) found at %x\n",
1330                                         id, config_ports[i]);
1331                         }
1332                 }
1333 
1334                 release_region(config_ports[i], 2);
1335         }
1336 
1337         host->config = 0;
1338         host->unlock_code = 0;
1339 
1340         return -ENODEV;
1341 }
1342 
1343 /*
1344  * Allocate/free io port ranges
1345  */
1346 
1347 static int wbsd_request_region(struct wbsd_host *host, int base)
1348 {
1349         if (base & 0x7)
1350                 return -EINVAL;
1351 
1352         if (!request_region(base, 8, DRIVER_NAME))
1353                 return -EIO;
1354 
1355         host->base = base;
1356 
1357         return 0;
1358 }
1359 
1360 static void wbsd_release_regions(struct wbsd_host *host)
1361 {
1362         if (host->base)
1363                 release_region(host->base, 8);
1364 
1365         host->base = 0;
1366 
1367         if (host->config)
1368                 release_region(host->config, 2);
1369 
1370         host->config = 0;
1371 }
1372 
1373 /*
1374  * Allocate/free DMA port and buffer
1375  */
1376 
1377 static void wbsd_request_dma(struct wbsd_host *host, int dma)
1378 {
1379         if (dma < 0)
1380                 return;
1381 
1382         if (request_dma(dma, DRIVER_NAME))
1383                 goto err;
1384 
1385         /*
1386          * We need to allocate a special buffer in
1387          * order for ISA to be able to DMA to it.
1388          */
1389         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1390                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1391         if (!host->dma_buffer)
1392                 goto free;
1393 
1394         /*
1395          * Translate the address to a physical address.
1396          */
1397         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1398                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1399 
1400         /*
1401          * ISA DMA must be aligned on a 64k basis.
1402          */
1403         if ((host->dma_addr & 0xffff) != 0)
1404                 goto kfree;
1405         /*
1406          * ISA cannot access memory above 16 MB.
1407          */
1408         else if (host->dma_addr >= 0x1000000)
1409                 goto kfree;
1410 
1411         host->dma = dma;
1412 
1413         return;
1414 
1415 kfree:
1416         /*
1417          * If we've gotten here then there is some kind of alignment bug
1418          */
1419         BUG_ON(1);
1420 
1421         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1422                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1423         host->dma_addr = 0;
1424 
1425         kfree(host->dma_buffer);
1426         host->dma_buffer = NULL;
1427 
1428 free:
1429         free_dma(dma);
1430 
1431 err:
1432         pr_warning(DRIVER_NAME ": Unable to allocate DMA %d. "
1433                 "Falling back on FIFO.\n", dma);
1434 }
1435 
1436 static void wbsd_release_dma(struct wbsd_host *host)
1437 {
1438         if (host->dma_addr) {
1439                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1440                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1441         }
1442         kfree(host->dma_buffer);
1443         if (host->dma >= 0)
1444                 free_dma(host->dma);
1445 
1446         host->dma = -1;
1447         host->dma_buffer = NULL;
1448         host->dma_addr = 0;
1449 }
1450 
1451 /*
1452  * Allocate/free IRQ.
1453  */
1454 
1455 static int wbsd_request_irq(struct wbsd_host *host, int irq)
1456 {
1457         int ret;
1458 
1459         /*
1460          * Set up tasklets. Must be done before requesting interrupt.
1461          */
1462         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1463                         (unsigned long)host);
1464         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1465                         (unsigned long)host);
1466         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1467                         (unsigned long)host);
1468         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1469                         (unsigned long)host);
1470         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1471                         (unsigned long)host);
1472 
1473         /*
1474          * Allocate interrupt.
1475          */
1476         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1477         if (ret)
1478                 return ret;
1479 
1480         host->irq = irq;
1481 
1482         return 0;
1483 }
1484 
1485 static void  wbsd_release_irq(struct wbsd_host *host)
1486 {
1487         if (!host->irq)
1488                 return;
1489 
1490         free_irq(host->irq, host);
1491 
1492         host->irq = 0;
1493 
1494         tasklet_kill(&host->card_tasklet);
1495         tasklet_kill(&host->fifo_tasklet);
1496         tasklet_kill(&host->crc_tasklet);
1497         tasklet_kill(&host->timeout_tasklet);
1498         tasklet_kill(&host->finish_tasklet);
1499 }
1500 
1501 /*
1502  * Allocate all resources for the host.
1503  */
1504 
1505 static int wbsd_request_resources(struct wbsd_host *host,
1506         int base, int irq, int dma)
1507 {
1508         int ret;
1509 
1510         /*
1511          * Allocate I/O ports.
1512          */
1513         ret = wbsd_request_region(host, base);
1514         if (ret)
1515                 return ret;
1516 
1517         /*
1518          * Allocate interrupt.
1519          */
1520         ret = wbsd_request_irq(host, irq);
1521         if (ret)
1522                 return ret;
1523 
1524         /*
1525          * Allocate DMA.
1526          */
1527         wbsd_request_dma(host, dma);
1528 
1529         return 0;
1530 }
1531 
1532 /*
1533  * Release all resources for the host.
1534  */
1535 
1536 static void wbsd_release_resources(struct wbsd_host *host)
1537 {
1538         wbsd_release_dma(host);
1539         wbsd_release_irq(host);
1540         wbsd_release_regions(host);
1541 }
1542 
1543 /*
1544  * Configure the resources the chip should use.
1545  */
1546 
1547 static void wbsd_chip_config(struct wbsd_host *host)
1548 {
1549         wbsd_unlock_config(host);
1550 
1551         /*
1552          * Reset the chip.
1553          */
1554         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1555         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1556 
1557         /*
1558          * Select SD/MMC function.
1559          */
1560         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1561 
1562         /*
1563          * Set up card detection.
1564          */
1565         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1566 
1567         /*
1568          * Configure chip
1569          */
1570         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1571         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1572 
1573         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1574 
1575         if (host->dma >= 0)
1576                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1577 
1578         /*
1579          * Enable and power up chip.
1580          */
1581         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1582         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1583 
1584         wbsd_lock_config(host);
1585 }
1586 
1587 /*
1588  * Check that configured resources are correct.
1589  */
1590 
1591 static int wbsd_chip_validate(struct wbsd_host *host)
1592 {
1593         int base, irq, dma;
1594 
1595         wbsd_unlock_config(host);
1596 
1597         /*
1598          * Select SD/MMC function.
1599          */
1600         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1601 
1602         /*
1603          * Read configuration.
1604          */
1605         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1606         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1607 
1608         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1609 
1610         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1611 
1612         wbsd_lock_config(host);
1613 
1614         /*
1615          * Validate against given configuration.
1616          */
1617         if (base != host->base)
1618                 return 0;
1619         if (irq != host->irq)
1620                 return 0;
1621         if ((dma != host->dma) && (host->dma != -1))
1622                 return 0;
1623 
1624         return 1;
1625 }
1626 
1627 /*
1628  * Powers down the SD function
1629  */
1630 
1631 static void wbsd_chip_poweroff(struct wbsd_host *host)
1632 {
1633         wbsd_unlock_config(host);
1634 
1635         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1636         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1637 
1638         wbsd_lock_config(host);
1639 }
1640 
1641 /*****************************************************************************\
1642  *                                                                           *
1643  * Devices setup and shutdown                                                *
1644  *                                                                           *
1645 \*****************************************************************************/
1646 
1647 static int wbsd_init(struct device *dev, int base, int irq, int dma,
1648         int pnp)
1649 {
1650         struct wbsd_host *host = NULL;
1651         struct mmc_host *mmc = NULL;
1652         int ret;
1653 
1654         ret = wbsd_alloc_mmc(dev);
1655         if (ret)
1656                 return ret;
1657 
1658         mmc = dev_get_drvdata(dev);
1659         host = mmc_priv(mmc);
1660 
1661         /*
1662          * Scan for hardware.
1663          */
1664         ret = wbsd_scan(host);
1665         if (ret) {
1666                 if (pnp && (ret == -ENODEV)) {
1667                         pr_warning(DRIVER_NAME
1668                                 ": Unable to confirm device presence. You may "
1669                                 "experience lock-ups.\n");
1670                 } else {
1671                         wbsd_free_mmc(dev);
1672                         return ret;
1673                 }
1674         }
1675 
1676         /*
1677          * Request resources.
1678          */
1679         ret = wbsd_request_resources(host, base, irq, dma);
1680         if (ret) {
1681                 wbsd_release_resources(host);
1682                 wbsd_free_mmc(dev);
1683                 return ret;
1684         }
1685 
1686         /*
1687          * See if chip needs to be configured.
1688          */
1689         if (pnp) {
1690                 if ((host->config != 0) && !wbsd_chip_validate(host)) {
1691                         pr_warning(DRIVER_NAME
1692                                 ": PnP active but chip not configured! "
1693                                 "You probably have a buggy BIOS. "
1694                                 "Configuring chip manually.\n");
1695                         wbsd_chip_config(host);
1696                 }
1697         } else
1698                 wbsd_chip_config(host);
1699 
1700         /*
1701          * Power Management stuff. No idea how this works.
1702          * Not tested.
1703          */
1704 #ifdef CONFIG_PM
1705         if (host->config) {
1706                 wbsd_unlock_config(host);
1707                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1708                 wbsd_lock_config(host);
1709         }
1710 #endif
1711         /*
1712          * Allow device to initialise itself properly.
1713          */
1714         mdelay(5);
1715 
1716         /*
1717          * Reset the chip into a known state.
1718          */
1719         wbsd_init_device(host);
1720 
1721         mmc_add_host(mmc);
1722 
1723         pr_info("%s: W83L51xD", mmc_hostname(mmc));
1724         if (host->chip_id != 0)
1725                 printk(" id %x", (int)host->chip_id);
1726         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1727         if (host->dma >= 0)
1728                 printk(" dma %d", (int)host->dma);
1729         else
1730                 printk(" FIFO");
1731         if (pnp)
1732                 printk(" PnP");
1733         printk("\n");
1734 
1735         return 0;
1736 }
1737 
1738 static void wbsd_shutdown(struct device *dev, int pnp)
1739 {
1740         struct mmc_host *mmc = dev_get_drvdata(dev);
1741         struct wbsd_host *host;
1742 
1743         if (!mmc)
1744                 return;
1745 
1746         host = mmc_priv(mmc);
1747 
1748         mmc_remove_host(mmc);
1749 
1750         /*
1751          * Power down the SD/MMC function.
1752          */
1753         if (!pnp)
1754                 wbsd_chip_poweroff(host);
1755 
1756         wbsd_release_resources(host);
1757 
1758         wbsd_free_mmc(dev);
1759 }
1760 
1761 /*
1762  * Non-PnP
1763  */
1764 
1765 static int wbsd_probe(struct platform_device *dev)
1766 {
1767         /* Use the module parameters for resources */
1768         return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1769 }
1770 
1771 static int wbsd_remove(struct platform_device *dev)
1772 {
1773         wbsd_shutdown(&dev->dev, 0);
1774 
1775         return 0;
1776 }
1777 
1778 /*
1779  * PnP
1780  */
1781 
1782 #ifdef CONFIG_PNP
1783 
1784 static int
1785 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1786 {
1787         int io, irq, dma;
1788 
1789         /*
1790          * Get resources from PnP layer.
1791          */
1792         io = pnp_port_start(pnpdev, 0);
1793         irq = pnp_irq(pnpdev, 0);
1794         if (pnp_dma_valid(pnpdev, 0))
1795                 dma = pnp_dma(pnpdev, 0);
1796         else
1797                 dma = -1;
1798 
1799         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1800 
1801         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1802 }
1803 
1804 static void wbsd_pnp_remove(struct pnp_dev *dev)
1805 {
1806         wbsd_shutdown(&dev->dev, 1);
1807 }
1808 
1809 #endif /* CONFIG_PNP */
1810 
1811 /*
1812  * Power management
1813  */
1814 
1815 #ifdef CONFIG_PM
1816 
1817 static int wbsd_platform_suspend(struct platform_device *dev,
1818                                  pm_message_t state)
1819 {
1820         struct mmc_host *mmc = platform_get_drvdata(dev);
1821         struct wbsd_host *host;
1822 
1823         if (mmc == NULL)
1824                 return 0;
1825 
1826         DBGF("Suspending...\n");
1827 
1828         host = mmc_priv(mmc);
1829 
1830         wbsd_chip_poweroff(host);
1831         return 0;
1832 }
1833 
1834 static int wbsd_platform_resume(struct platform_device *dev)
1835 {
1836         struct mmc_host *mmc = platform_get_drvdata(dev);
1837         struct wbsd_host *host;
1838 
1839         if (mmc == NULL)
1840                 return 0;
1841 
1842         DBGF("Resuming...\n");
1843 
1844         host = mmc_priv(mmc);
1845 
1846         wbsd_chip_config(host);
1847 
1848         /*
1849          * Allow device to initialise itself properly.
1850          */
1851         mdelay(5);
1852 
1853         wbsd_init_device(host);
1854         return 0;
1855 }
1856 
1857 #ifdef CONFIG_PNP
1858 
1859 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1860 {
1861         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1862 
1863         if (mmc == NULL)
1864                 return 0;
1865 
1866         DBGF("Suspending...\n");
1867         return 0;
1868 }
1869 
1870 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1871 {
1872         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1873         struct wbsd_host *host;
1874 
1875         if (mmc == NULL)
1876                 return 0;
1877 
1878         DBGF("Resuming...\n");
1879 
1880         host = mmc_priv(mmc);
1881 
1882         /*
1883          * See if chip needs to be configured.
1884          */
1885         if (host->config != 0) {
1886                 if (!wbsd_chip_validate(host)) {
1887                         pr_warning(DRIVER_NAME
1888                                 ": PnP active but chip not configured! "
1889                                 "You probably have a buggy BIOS. "
1890                                 "Configuring chip manually.\n");
1891                         wbsd_chip_config(host);
1892                 }
1893         }
1894 
1895         /*
1896          * Allow device to initialise itself properly.
1897          */
1898         mdelay(5);
1899 
1900         wbsd_init_device(host);
1901         return 0;
1902 }
1903 
1904 #endif /* CONFIG_PNP */
1905 
1906 #else /* CONFIG_PM */
1907 
1908 #define wbsd_platform_suspend NULL
1909 #define wbsd_platform_resume NULL
1910 
1911 #define wbsd_pnp_suspend NULL
1912 #define wbsd_pnp_resume NULL
1913 
1914 #endif /* CONFIG_PM */
1915 
1916 static struct platform_device *wbsd_device;
1917 
1918 static struct platform_driver wbsd_driver = {
1919         .probe          = wbsd_probe,
1920         .remove         = wbsd_remove,
1921 
1922         .suspend        = wbsd_platform_suspend,
1923         .resume         = wbsd_platform_resume,
1924         .driver         = {
1925                 .name   = DRIVER_NAME,
1926                 .owner  = THIS_MODULE,
1927         },
1928 };
1929 
1930 #ifdef CONFIG_PNP
1931 
1932 static struct pnp_driver wbsd_pnp_driver = {
1933         .name           = DRIVER_NAME,
1934         .id_table       = pnp_dev_table,
1935         .probe          = wbsd_pnp_probe,
1936         .remove         = wbsd_pnp_remove,
1937 
1938         .suspend        = wbsd_pnp_suspend,
1939         .resume         = wbsd_pnp_resume,
1940 };
1941 
1942 #endif /* CONFIG_PNP */
1943 
1944 /*
1945  * Module loading/unloading
1946  */
1947 
1948 static int __init wbsd_drv_init(void)
1949 {
1950         int result;
1951 
1952         pr_info(DRIVER_NAME
1953                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1954         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1955 
1956 #ifdef CONFIG_PNP
1957 
1958         if (!param_nopnp) {
1959                 result = pnp_register_driver(&wbsd_pnp_driver);
1960                 if (result < 0)
1961                         return result;
1962         }
1963 #endif /* CONFIG_PNP */
1964 
1965         if (param_nopnp) {
1966                 result = platform_driver_register(&wbsd_driver);
1967                 if (result < 0)
1968                         return result;
1969 
1970                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1971                 if (!wbsd_device) {
1972                         platform_driver_unregister(&wbsd_driver);
1973                         return -ENOMEM;
1974                 }
1975 
1976                 result = platform_device_add(wbsd_device);
1977                 if (result) {
1978                         platform_device_put(wbsd_device);
1979                         platform_driver_unregister(&wbsd_driver);
1980                         return result;
1981                 }
1982         }
1983 
1984         return 0;
1985 }
1986 
1987 static void __exit wbsd_drv_exit(void)
1988 {
1989 #ifdef CONFIG_PNP
1990 
1991         if (!param_nopnp)
1992                 pnp_unregister_driver(&wbsd_pnp_driver);
1993 
1994 #endif /* CONFIG_PNP */
1995 
1996         if (param_nopnp) {
1997                 platform_device_unregister(wbsd_device);
1998 
1999                 platform_driver_unregister(&wbsd_driver);
2000         }
2001 
2002         DBG("unloaded\n");
2003 }
2004 
2005 module_init(wbsd_drv_init);
2006 module_exit(wbsd_drv_exit);
2007 #ifdef CONFIG_PNP
2008 module_param_named(nopnp, param_nopnp, uint, 0444);
2009 #endif
2010 module_param_named(io, param_io, uint, 0444);
2011 module_param_named(irq, param_irq, uint, 0444);
2012 module_param_named(dma, param_dma, int, 0444);
2013 
2014 MODULE_LICENSE("GPL");
2015 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2016 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2017 
2018 #ifdef CONFIG_PNP
2019 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2020 #endif
2021 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2022 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2023 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
2024 

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