Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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_warn("%s: Data command %d is not supported by this controller\n",
807                                 mmc_hostname(host->mmc), cmd->opcode);
808 #endif
809                         cmd->error = -EINVAL;
810 
811                         goto done;
812                 }
813         }
814 
815         /*
816          * Does the request include data?
817          */
818         if (cmd->data) {
819                 wbsd_prepare_data(host, cmd->data);
820 
821                 if (cmd->data->error)
822                         goto done;
823         }
824 
825         wbsd_send_command(host, cmd);
826 
827         /*
828          * If this is a data transfer the request
829          * will be finished after the data has
830          * transferred.
831          */
832         if (cmd->data && !cmd->error) {
833                 /*
834                  * Dirty fix for hardware bug.
835                  */
836                 if (host->dma == -1)
837                         tasklet_schedule(&host->fifo_tasklet);
838 
839                 spin_unlock_bh(&host->lock);
840 
841                 return;
842         }
843 
844 done:
845         wbsd_request_end(host, mrq);
846 
847         spin_unlock_bh(&host->lock);
848 }
849 
850 static void wbsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
851 {
852         struct wbsd_host *host = mmc_priv(mmc);
853         u8 clk, setup, pwr;
854 
855         spin_lock_bh(&host->lock);
856 
857         /*
858          * Reset the chip on each power off.
859          * Should clear out any weird states.
860          */
861         if (ios->power_mode == MMC_POWER_OFF)
862                 wbsd_init_device(host);
863 
864         if (ios->clock >= 24000000)
865                 clk = WBSD_CLK_24M;
866         else if (ios->clock >= 16000000)
867                 clk = WBSD_CLK_16M;
868         else if (ios->clock >= 12000000)
869                 clk = WBSD_CLK_12M;
870         else
871                 clk = WBSD_CLK_375K;
872 
873         /*
874          * Only write to the clock register when
875          * there is an actual change.
876          */
877         if (clk != host->clk) {
878                 wbsd_write_index(host, WBSD_IDX_CLK, clk);
879                 host->clk = clk;
880         }
881 
882         /*
883          * Power up card.
884          */
885         if (ios->power_mode != MMC_POWER_OFF) {
886                 pwr = inb(host->base + WBSD_CSR);
887                 pwr &= ~WBSD_POWER_N;
888                 outb(pwr, host->base + WBSD_CSR);
889         }
890 
891         /*
892          * MMC cards need to have pin 1 high during init.
893          * It wreaks havoc with the card detection though so
894          * that needs to be disabled.
895          */
896         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
897         if (ios->chip_select == MMC_CS_HIGH) {
898                 BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
899                 setup |= WBSD_DAT3_H;
900                 host->flags |= WBSD_FIGNORE_DETECT;
901         } else {
902                 if (setup & WBSD_DAT3_H) {
903                         setup &= ~WBSD_DAT3_H;
904 
905                         /*
906                          * We cannot resume card detection immediately
907                          * because of capacitance and delays in the chip.
908                          */
909                         mod_timer(&host->ignore_timer, jiffies + HZ / 100);
910                 }
911         }
912         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
913 
914         /*
915          * Store bus width for later. Will be used when
916          * setting up the data transfer.
917          */
918         host->bus_width = ios->bus_width;
919 
920         spin_unlock_bh(&host->lock);
921 }
922 
923 static int wbsd_get_ro(struct mmc_host *mmc)
924 {
925         struct wbsd_host *host = mmc_priv(mmc);
926         u8 csr;
927 
928         spin_lock_bh(&host->lock);
929 
930         csr = inb(host->base + WBSD_CSR);
931         csr |= WBSD_MSLED;
932         outb(csr, host->base + WBSD_CSR);
933 
934         mdelay(1);
935 
936         csr = inb(host->base + WBSD_CSR);
937         csr &= ~WBSD_MSLED;
938         outb(csr, host->base + WBSD_CSR);
939 
940         spin_unlock_bh(&host->lock);
941 
942         return !!(csr & WBSD_WRPT);
943 }
944 
945 static const struct mmc_host_ops wbsd_ops = {
946         .request        = wbsd_request,
947         .set_ios        = wbsd_set_ios,
948         .get_ro         = wbsd_get_ro,
949 };
950 
951 /*****************************************************************************\
952  *                                                                           *
953  * Interrupt handling                                                        *
954  *                                                                           *
955 \*****************************************************************************/
956 
957 /*
958  * Helper function to reset detection ignore
959  */
960 
961 static void wbsd_reset_ignore(unsigned long data)
962 {
963         struct wbsd_host *host = (struct wbsd_host *)data;
964 
965         BUG_ON(host == NULL);
966 
967         DBG("Resetting card detection ignore\n");
968 
969         spin_lock_bh(&host->lock);
970 
971         host->flags &= ~WBSD_FIGNORE_DETECT;
972 
973         /*
974          * Card status might have changed during the
975          * blackout.
976          */
977         tasklet_schedule(&host->card_tasklet);
978 
979         spin_unlock_bh(&host->lock);
980 }
981 
982 /*
983  * Tasklets
984  */
985 
986 static inline struct mmc_data *wbsd_get_data(struct wbsd_host *host)
987 {
988         WARN_ON(!host->mrq);
989         if (!host->mrq)
990                 return NULL;
991 
992         WARN_ON(!host->mrq->cmd);
993         if (!host->mrq->cmd)
994                 return NULL;
995 
996         WARN_ON(!host->mrq->cmd->data);
997         if (!host->mrq->cmd->data)
998                 return NULL;
999 
1000         return host->mrq->cmd->data;
1001 }
1002 
1003 static void wbsd_tasklet_card(unsigned long param)
1004 {
1005         struct wbsd_host *host = (struct wbsd_host *)param;
1006         u8 csr;
1007         int delay = -1;
1008 
1009         spin_lock(&host->lock);
1010 
1011         if (host->flags & WBSD_FIGNORE_DETECT) {
1012                 spin_unlock(&host->lock);
1013                 return;
1014         }
1015 
1016         csr = inb(host->base + WBSD_CSR);
1017         WARN_ON(csr == 0xff);
1018 
1019         if (csr & WBSD_CARDPRESENT) {
1020                 if (!(host->flags & WBSD_FCARD_PRESENT)) {
1021                         DBG("Card inserted\n");
1022                         host->flags |= WBSD_FCARD_PRESENT;
1023 
1024                         delay = 500;
1025                 }
1026         } else if (host->flags & WBSD_FCARD_PRESENT) {
1027                 DBG("Card removed\n");
1028                 host->flags &= ~WBSD_FCARD_PRESENT;
1029 
1030                 if (host->mrq) {
1031                         pr_err("%s: Card removed during transfer!\n",
1032                                 mmc_hostname(host->mmc));
1033                         wbsd_reset(host);
1034 
1035                         host->mrq->cmd->error = -ENOMEDIUM;
1036                         tasklet_schedule(&host->finish_tasklet);
1037                 }
1038 
1039                 delay = 0;
1040         }
1041 
1042         /*
1043          * Unlock first since we might get a call back.
1044          */
1045 
1046         spin_unlock(&host->lock);
1047 
1048         if (delay != -1)
1049                 mmc_detect_change(host->mmc, msecs_to_jiffies(delay));
1050 }
1051 
1052 static void wbsd_tasklet_fifo(unsigned long param)
1053 {
1054         struct wbsd_host *host = (struct wbsd_host *)param;
1055         struct mmc_data *data;
1056 
1057         spin_lock(&host->lock);
1058 
1059         if (!host->mrq)
1060                 goto end;
1061 
1062         data = wbsd_get_data(host);
1063         if (!data)
1064                 goto end;
1065 
1066         if (data->flags & MMC_DATA_WRITE)
1067                 wbsd_fill_fifo(host);
1068         else
1069                 wbsd_empty_fifo(host);
1070 
1071         /*
1072          * Done?
1073          */
1074         if (host->num_sg == 0) {
1075                 wbsd_write_index(host, WBSD_IDX_FIFOEN, 0);
1076                 tasklet_schedule(&host->finish_tasklet);
1077         }
1078 
1079 end:
1080         spin_unlock(&host->lock);
1081 }
1082 
1083 static void wbsd_tasklet_crc(unsigned long param)
1084 {
1085         struct wbsd_host *host = (struct wbsd_host *)param;
1086         struct mmc_data *data;
1087 
1088         spin_lock(&host->lock);
1089 
1090         if (!host->mrq)
1091                 goto end;
1092 
1093         data = wbsd_get_data(host);
1094         if (!data)
1095                 goto end;
1096 
1097         DBGF("CRC error\n");
1098 
1099         data->error = -EILSEQ;
1100 
1101         tasklet_schedule(&host->finish_tasklet);
1102 
1103 end:
1104         spin_unlock(&host->lock);
1105 }
1106 
1107 static void wbsd_tasklet_timeout(unsigned long param)
1108 {
1109         struct wbsd_host *host = (struct wbsd_host *)param;
1110         struct mmc_data *data;
1111 
1112         spin_lock(&host->lock);
1113 
1114         if (!host->mrq)
1115                 goto end;
1116 
1117         data = wbsd_get_data(host);
1118         if (!data)
1119                 goto end;
1120 
1121         DBGF("Timeout\n");
1122 
1123         data->error = -ETIMEDOUT;
1124 
1125         tasklet_schedule(&host->finish_tasklet);
1126 
1127 end:
1128         spin_unlock(&host->lock);
1129 }
1130 
1131 static void wbsd_tasklet_finish(unsigned long param)
1132 {
1133         struct wbsd_host *host = (struct wbsd_host *)param;
1134         struct mmc_data *data;
1135 
1136         spin_lock(&host->lock);
1137 
1138         WARN_ON(!host->mrq);
1139         if (!host->mrq)
1140                 goto end;
1141 
1142         data = wbsd_get_data(host);
1143         if (!data)
1144                 goto end;
1145 
1146         wbsd_finish_data(host, data);
1147 
1148 end:
1149         spin_unlock(&host->lock);
1150 }
1151 
1152 /*
1153  * Interrupt handling
1154  */
1155 
1156 static irqreturn_t wbsd_irq(int irq, void *dev_id)
1157 {
1158         struct wbsd_host *host = dev_id;
1159         int isr;
1160 
1161         isr = inb(host->base + WBSD_ISR);
1162 
1163         /*
1164          * Was it actually our hardware that caused the interrupt?
1165          */
1166         if (isr == 0xff || isr == 0x00)
1167                 return IRQ_NONE;
1168 
1169         host->isr |= isr;
1170 
1171         /*
1172          * Schedule tasklets as needed.
1173          */
1174         if (isr & WBSD_INT_CARD)
1175                 tasklet_schedule(&host->card_tasklet);
1176         if (isr & WBSD_INT_FIFO_THRE)
1177                 tasklet_schedule(&host->fifo_tasklet);
1178         if (isr & WBSD_INT_CRC)
1179                 tasklet_hi_schedule(&host->crc_tasklet);
1180         if (isr & WBSD_INT_TIMEOUT)
1181                 tasklet_hi_schedule(&host->timeout_tasklet);
1182         if (isr & WBSD_INT_TC)
1183                 tasklet_schedule(&host->finish_tasklet);
1184 
1185         return IRQ_HANDLED;
1186 }
1187 
1188 /*****************************************************************************\
1189  *                                                                           *
1190  * Device initialisation and shutdown                                        *
1191  *                                                                           *
1192 \*****************************************************************************/
1193 
1194 /*
1195  * Allocate/free MMC structure.
1196  */
1197 
1198 static int wbsd_alloc_mmc(struct device *dev)
1199 {
1200         struct mmc_host *mmc;
1201         struct wbsd_host *host;
1202 
1203         /*
1204          * Allocate MMC structure.
1205          */
1206         mmc = mmc_alloc_host(sizeof(struct wbsd_host), dev);
1207         if (!mmc)
1208                 return -ENOMEM;
1209 
1210         host = mmc_priv(mmc);
1211         host->mmc = mmc;
1212 
1213         host->dma = -1;
1214 
1215         /*
1216          * Set host parameters.
1217          */
1218         mmc->ops = &wbsd_ops;
1219         mmc->f_min = 375000;
1220         mmc->f_max = 24000000;
1221         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
1222         mmc->caps = MMC_CAP_4_BIT_DATA;
1223 
1224         spin_lock_init(&host->lock);
1225 
1226         /*
1227          * Set up timers
1228          */
1229         init_timer(&host->ignore_timer);
1230         host->ignore_timer.data = (unsigned long)host;
1231         host->ignore_timer.function = wbsd_reset_ignore;
1232 
1233         /*
1234          * Maximum number of segments. Worst case is one sector per segment
1235          * so this will be 64kB/512.
1236          */
1237         mmc->max_segs = 128;
1238 
1239         /*
1240          * Maximum request size. Also limited by 64KiB buffer.
1241          */
1242         mmc->max_req_size = 65536;
1243 
1244         /*
1245          * Maximum segment size. Could be one segment with the maximum number
1246          * of bytes.
1247          */
1248         mmc->max_seg_size = mmc->max_req_size;
1249 
1250         /*
1251          * Maximum block size. We have 12 bits (= 4095) but have to subtract
1252          * space for CRC. So the maximum is 4095 - 4*2 = 4087.
1253          */
1254         mmc->max_blk_size = 4087;
1255 
1256         /*
1257          * Maximum block count. There is no real limit so the maximum
1258          * request size will be the only restriction.
1259          */
1260         mmc->max_blk_count = mmc->max_req_size;
1261 
1262         dev_set_drvdata(dev, mmc);
1263 
1264         return 0;
1265 }
1266 
1267 static void wbsd_free_mmc(struct device *dev)
1268 {
1269         struct mmc_host *mmc;
1270         struct wbsd_host *host;
1271 
1272         mmc = dev_get_drvdata(dev);
1273         if (!mmc)
1274                 return;
1275 
1276         host = mmc_priv(mmc);
1277         BUG_ON(host == NULL);
1278 
1279         del_timer_sync(&host->ignore_timer);
1280 
1281         mmc_free_host(mmc);
1282 
1283         dev_set_drvdata(dev, NULL);
1284 }
1285 
1286 /*
1287  * Scan for known chip id:s
1288  */
1289 
1290 static int wbsd_scan(struct wbsd_host *host)
1291 {
1292         int i, j, k;
1293         int id;
1294 
1295         /*
1296          * Iterate through all ports, all codes to
1297          * find hardware that is in our known list.
1298          */
1299         for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
1300                 if (!request_region(config_ports[i], 2, DRIVER_NAME))
1301                         continue;
1302 
1303                 for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
1304                         id = 0xFFFF;
1305 
1306                         host->config = config_ports[i];
1307                         host->unlock_code = unlock_codes[j];
1308 
1309                         wbsd_unlock_config(host);
1310 
1311                         outb(WBSD_CONF_ID_HI, config_ports[i]);
1312                         id = inb(config_ports[i] + 1) << 8;
1313 
1314                         outb(WBSD_CONF_ID_LO, config_ports[i]);
1315                         id |= inb(config_ports[i] + 1);
1316 
1317                         wbsd_lock_config(host);
1318 
1319                         for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
1320                                 if (id == valid_ids[k]) {
1321                                         host->chip_id = id;
1322 
1323                                         return 0;
1324                                 }
1325                         }
1326 
1327                         if (id != 0xFFFF) {
1328                                 DBG("Unknown hardware (id %x) found at %x\n",
1329                                         id, config_ports[i]);
1330                         }
1331                 }
1332 
1333                 release_region(config_ports[i], 2);
1334         }
1335 
1336         host->config = 0;
1337         host->unlock_code = 0;
1338 
1339         return -ENODEV;
1340 }
1341 
1342 /*
1343  * Allocate/free io port ranges
1344  */
1345 
1346 static int wbsd_request_region(struct wbsd_host *host, int base)
1347 {
1348         if (base & 0x7)
1349                 return -EINVAL;
1350 
1351         if (!request_region(base, 8, DRIVER_NAME))
1352                 return -EIO;
1353 
1354         host->base = base;
1355 
1356         return 0;
1357 }
1358 
1359 static void wbsd_release_regions(struct wbsd_host *host)
1360 {
1361         if (host->base)
1362                 release_region(host->base, 8);
1363 
1364         host->base = 0;
1365 
1366         if (host->config)
1367                 release_region(host->config, 2);
1368 
1369         host->config = 0;
1370 }
1371 
1372 /*
1373  * Allocate/free DMA port and buffer
1374  */
1375 
1376 static void wbsd_request_dma(struct wbsd_host *host, int dma)
1377 {
1378         if (dma < 0)
1379                 return;
1380 
1381         if (request_dma(dma, DRIVER_NAME))
1382                 goto err;
1383 
1384         /*
1385          * We need to allocate a special buffer in
1386          * order for ISA to be able to DMA to it.
1387          */
1388         host->dma_buffer = kmalloc(WBSD_DMA_SIZE,
1389                 GFP_NOIO | GFP_DMA | __GFP_REPEAT | __GFP_NOWARN);
1390         if (!host->dma_buffer)
1391                 goto free;
1392 
1393         /*
1394          * Translate the address to a physical address.
1395          */
1396         host->dma_addr = dma_map_single(mmc_dev(host->mmc), host->dma_buffer,
1397                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1398         if (dma_mapping_error(mmc_dev(host->mmc), host->dma_addr))
1399                 goto kfree;
1400 
1401         /*
1402          * ISA DMA must be aligned on a 64k basis.
1403          */
1404         if ((host->dma_addr & 0xffff) != 0)
1405                 goto unmap;
1406         /*
1407          * ISA cannot access memory above 16 MB.
1408          */
1409         else if (host->dma_addr >= 0x1000000)
1410                 goto unmap;
1411 
1412         host->dma = dma;
1413 
1414         return;
1415 
1416 unmap:
1417         /*
1418          * If we've gotten here then there is some kind of alignment bug
1419          */
1420         BUG_ON(1);
1421 
1422         dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1423                 WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1424         host->dma_addr = 0;
1425 
1426 kfree:
1427         kfree(host->dma_buffer);
1428         host->dma_buffer = NULL;
1429 
1430 free:
1431         free_dma(dma);
1432 
1433 err:
1434         pr_warn(DRIVER_NAME ": Unable to allocate DMA %d - falling back on FIFO\n",
1435                 dma);
1436 }
1437 
1438 static void wbsd_release_dma(struct wbsd_host *host)
1439 {
1440         if (!dma_mapping_error(mmc_dev(host->mmc), host->dma_addr)) {
1441                 dma_unmap_single(mmc_dev(host->mmc), host->dma_addr,
1442                         WBSD_DMA_SIZE, DMA_BIDIRECTIONAL);
1443         }
1444         kfree(host->dma_buffer);
1445         if (host->dma >= 0)
1446                 free_dma(host->dma);
1447 
1448         host->dma = -1;
1449         host->dma_buffer = NULL;
1450         host->dma_addr = 0;
1451 }
1452 
1453 /*
1454  * Allocate/free IRQ.
1455  */
1456 
1457 static int wbsd_request_irq(struct wbsd_host *host, int irq)
1458 {
1459         int ret;
1460 
1461         /*
1462          * Set up tasklets. Must be done before requesting interrupt.
1463          */
1464         tasklet_init(&host->card_tasklet, wbsd_tasklet_card,
1465                         (unsigned long)host);
1466         tasklet_init(&host->fifo_tasklet, wbsd_tasklet_fifo,
1467                         (unsigned long)host);
1468         tasklet_init(&host->crc_tasklet, wbsd_tasklet_crc,
1469                         (unsigned long)host);
1470         tasklet_init(&host->timeout_tasklet, wbsd_tasklet_timeout,
1471                         (unsigned long)host);
1472         tasklet_init(&host->finish_tasklet, wbsd_tasklet_finish,
1473                         (unsigned long)host);
1474 
1475         /*
1476          * Allocate interrupt.
1477          */
1478         ret = request_irq(irq, wbsd_irq, IRQF_SHARED, DRIVER_NAME, host);
1479         if (ret)
1480                 return ret;
1481 
1482         host->irq = irq;
1483 
1484         return 0;
1485 }
1486 
1487 static void  wbsd_release_irq(struct wbsd_host *host)
1488 {
1489         if (!host->irq)
1490                 return;
1491 
1492         free_irq(host->irq, host);
1493 
1494         host->irq = 0;
1495 
1496         tasklet_kill(&host->card_tasklet);
1497         tasklet_kill(&host->fifo_tasklet);
1498         tasklet_kill(&host->crc_tasklet);
1499         tasklet_kill(&host->timeout_tasklet);
1500         tasklet_kill(&host->finish_tasklet);
1501 }
1502 
1503 /*
1504  * Allocate all resources for the host.
1505  */
1506 
1507 static int wbsd_request_resources(struct wbsd_host *host,
1508         int base, int irq, int dma)
1509 {
1510         int ret;
1511 
1512         /*
1513          * Allocate I/O ports.
1514          */
1515         ret = wbsd_request_region(host, base);
1516         if (ret)
1517                 return ret;
1518 
1519         /*
1520          * Allocate interrupt.
1521          */
1522         ret = wbsd_request_irq(host, irq);
1523         if (ret)
1524                 return ret;
1525 
1526         /*
1527          * Allocate DMA.
1528          */
1529         wbsd_request_dma(host, dma);
1530 
1531         return 0;
1532 }
1533 
1534 /*
1535  * Release all resources for the host.
1536  */
1537 
1538 static void wbsd_release_resources(struct wbsd_host *host)
1539 {
1540         wbsd_release_dma(host);
1541         wbsd_release_irq(host);
1542         wbsd_release_regions(host);
1543 }
1544 
1545 /*
1546  * Configure the resources the chip should use.
1547  */
1548 
1549 static void wbsd_chip_config(struct wbsd_host *host)
1550 {
1551         wbsd_unlock_config(host);
1552 
1553         /*
1554          * Reset the chip.
1555          */
1556         wbsd_write_config(host, WBSD_CONF_SWRST, 1);
1557         wbsd_write_config(host, WBSD_CONF_SWRST, 0);
1558 
1559         /*
1560          * Select SD/MMC function.
1561          */
1562         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1563 
1564         /*
1565          * Set up card detection.
1566          */
1567         wbsd_write_config(host, WBSD_CONF_PINS, WBSD_PINS_DETECT_GP11);
1568 
1569         /*
1570          * Configure chip
1571          */
1572         wbsd_write_config(host, WBSD_CONF_PORT_HI, host->base >> 8);
1573         wbsd_write_config(host, WBSD_CONF_PORT_LO, host->base & 0xff);
1574 
1575         wbsd_write_config(host, WBSD_CONF_IRQ, host->irq);
1576 
1577         if (host->dma >= 0)
1578                 wbsd_write_config(host, WBSD_CONF_DRQ, host->dma);
1579 
1580         /*
1581          * Enable and power up chip.
1582          */
1583         wbsd_write_config(host, WBSD_CONF_ENABLE, 1);
1584         wbsd_write_config(host, WBSD_CONF_POWER, 0x20);
1585 
1586         wbsd_lock_config(host);
1587 }
1588 
1589 /*
1590  * Check that configured resources are correct.
1591  */
1592 
1593 static int wbsd_chip_validate(struct wbsd_host *host)
1594 {
1595         int base, irq, dma;
1596 
1597         wbsd_unlock_config(host);
1598 
1599         /*
1600          * Select SD/MMC function.
1601          */
1602         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1603 
1604         /*
1605          * Read configuration.
1606          */
1607         base = wbsd_read_config(host, WBSD_CONF_PORT_HI) << 8;
1608         base |= wbsd_read_config(host, WBSD_CONF_PORT_LO);
1609 
1610         irq = wbsd_read_config(host, WBSD_CONF_IRQ);
1611 
1612         dma = wbsd_read_config(host, WBSD_CONF_DRQ);
1613 
1614         wbsd_lock_config(host);
1615 
1616         /*
1617          * Validate against given configuration.
1618          */
1619         if (base != host->base)
1620                 return 0;
1621         if (irq != host->irq)
1622                 return 0;
1623         if ((dma != host->dma) && (host->dma != -1))
1624                 return 0;
1625 
1626         return 1;
1627 }
1628 
1629 /*
1630  * Powers down the SD function
1631  */
1632 
1633 static void wbsd_chip_poweroff(struct wbsd_host *host)
1634 {
1635         wbsd_unlock_config(host);
1636 
1637         wbsd_write_config(host, WBSD_CONF_DEVICE, DEVICE_SD);
1638         wbsd_write_config(host, WBSD_CONF_ENABLE, 0);
1639 
1640         wbsd_lock_config(host);
1641 }
1642 
1643 /*****************************************************************************\
1644  *                                                                           *
1645  * Devices setup and shutdown                                                *
1646  *                                                                           *
1647 \*****************************************************************************/
1648 
1649 static int wbsd_init(struct device *dev, int base, int irq, int dma,
1650         int pnp)
1651 {
1652         struct wbsd_host *host = NULL;
1653         struct mmc_host *mmc = NULL;
1654         int ret;
1655 
1656         ret = wbsd_alloc_mmc(dev);
1657         if (ret)
1658                 return ret;
1659 
1660         mmc = dev_get_drvdata(dev);
1661         host = mmc_priv(mmc);
1662 
1663         /*
1664          * Scan for hardware.
1665          */
1666         ret = wbsd_scan(host);
1667         if (ret) {
1668                 if (pnp && (ret == -ENODEV)) {
1669                         pr_warn(DRIVER_NAME ": Unable to confirm device presence - you may 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_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1692                         wbsd_chip_config(host);
1693                 }
1694         } else
1695                 wbsd_chip_config(host);
1696 
1697         /*
1698          * Power Management stuff. No idea how this works.
1699          * Not tested.
1700          */
1701 #ifdef CONFIG_PM
1702         if (host->config) {
1703                 wbsd_unlock_config(host);
1704                 wbsd_write_config(host, WBSD_CONF_PME, 0xA0);
1705                 wbsd_lock_config(host);
1706         }
1707 #endif
1708         /*
1709          * Allow device to initialise itself properly.
1710          */
1711         mdelay(5);
1712 
1713         /*
1714          * Reset the chip into a known state.
1715          */
1716         wbsd_init_device(host);
1717 
1718         mmc_add_host(mmc);
1719 
1720         pr_info("%s: W83L51xD", mmc_hostname(mmc));
1721         if (host->chip_id != 0)
1722                 printk(" id %x", (int)host->chip_id);
1723         printk(" at 0x%x irq %d", (int)host->base, (int)host->irq);
1724         if (host->dma >= 0)
1725                 printk(" dma %d", (int)host->dma);
1726         else
1727                 printk(" FIFO");
1728         if (pnp)
1729                 printk(" PnP");
1730         printk("\n");
1731 
1732         return 0;
1733 }
1734 
1735 static void wbsd_shutdown(struct device *dev, int pnp)
1736 {
1737         struct mmc_host *mmc = dev_get_drvdata(dev);
1738         struct wbsd_host *host;
1739 
1740         if (!mmc)
1741                 return;
1742 
1743         host = mmc_priv(mmc);
1744 
1745         mmc_remove_host(mmc);
1746 
1747         /*
1748          * Power down the SD/MMC function.
1749          */
1750         if (!pnp)
1751                 wbsd_chip_poweroff(host);
1752 
1753         wbsd_release_resources(host);
1754 
1755         wbsd_free_mmc(dev);
1756 }
1757 
1758 /*
1759  * Non-PnP
1760  */
1761 
1762 static int wbsd_probe(struct platform_device *dev)
1763 {
1764         /* Use the module parameters for resources */
1765         return wbsd_init(&dev->dev, param_io, param_irq, param_dma, 0);
1766 }
1767 
1768 static int wbsd_remove(struct platform_device *dev)
1769 {
1770         wbsd_shutdown(&dev->dev, 0);
1771 
1772         return 0;
1773 }
1774 
1775 /*
1776  * PnP
1777  */
1778 
1779 #ifdef CONFIG_PNP
1780 
1781 static int
1782 wbsd_pnp_probe(struct pnp_dev *pnpdev, const struct pnp_device_id *dev_id)
1783 {
1784         int io, irq, dma;
1785 
1786         /*
1787          * Get resources from PnP layer.
1788          */
1789         io = pnp_port_start(pnpdev, 0);
1790         irq = pnp_irq(pnpdev, 0);
1791         if (pnp_dma_valid(pnpdev, 0))
1792                 dma = pnp_dma(pnpdev, 0);
1793         else
1794                 dma = -1;
1795 
1796         DBGF("PnP resources: port %3x irq %d dma %d\n", io, irq, dma);
1797 
1798         return wbsd_init(&pnpdev->dev, io, irq, dma, 1);
1799 }
1800 
1801 static void wbsd_pnp_remove(struct pnp_dev *dev)
1802 {
1803         wbsd_shutdown(&dev->dev, 1);
1804 }
1805 
1806 #endif /* CONFIG_PNP */
1807 
1808 /*
1809  * Power management
1810  */
1811 
1812 #ifdef CONFIG_PM
1813 
1814 static int wbsd_platform_suspend(struct platform_device *dev,
1815                                  pm_message_t state)
1816 {
1817         struct mmc_host *mmc = platform_get_drvdata(dev);
1818         struct wbsd_host *host;
1819 
1820         if (mmc == NULL)
1821                 return 0;
1822 
1823         DBGF("Suspending...\n");
1824 
1825         host = mmc_priv(mmc);
1826 
1827         wbsd_chip_poweroff(host);
1828         return 0;
1829 }
1830 
1831 static int wbsd_platform_resume(struct platform_device *dev)
1832 {
1833         struct mmc_host *mmc = platform_get_drvdata(dev);
1834         struct wbsd_host *host;
1835 
1836         if (mmc == NULL)
1837                 return 0;
1838 
1839         DBGF("Resuming...\n");
1840 
1841         host = mmc_priv(mmc);
1842 
1843         wbsd_chip_config(host);
1844 
1845         /*
1846          * Allow device to initialise itself properly.
1847          */
1848         mdelay(5);
1849 
1850         wbsd_init_device(host);
1851         return 0;
1852 }
1853 
1854 #ifdef CONFIG_PNP
1855 
1856 static int wbsd_pnp_suspend(struct pnp_dev *pnp_dev, pm_message_t state)
1857 {
1858         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1859 
1860         if (mmc == NULL)
1861                 return 0;
1862 
1863         DBGF("Suspending...\n");
1864         return 0;
1865 }
1866 
1867 static int wbsd_pnp_resume(struct pnp_dev *pnp_dev)
1868 {
1869         struct mmc_host *mmc = dev_get_drvdata(&pnp_dev->dev);
1870         struct wbsd_host *host;
1871 
1872         if (mmc == NULL)
1873                 return 0;
1874 
1875         DBGF("Resuming...\n");
1876 
1877         host = mmc_priv(mmc);
1878 
1879         /*
1880          * See if chip needs to be configured.
1881          */
1882         if (host->config != 0) {
1883                 if (!wbsd_chip_validate(host)) {
1884                         pr_warn(DRIVER_NAME ": PnP active but chip not configured! You probably have a buggy BIOS. Configuring chip manually.\n");
1885                         wbsd_chip_config(host);
1886                 }
1887         }
1888 
1889         /*
1890          * Allow device to initialise itself properly.
1891          */
1892         mdelay(5);
1893 
1894         wbsd_init_device(host);
1895         return 0;
1896 }
1897 
1898 #endif /* CONFIG_PNP */
1899 
1900 #else /* CONFIG_PM */
1901 
1902 #define wbsd_platform_suspend NULL
1903 #define wbsd_platform_resume NULL
1904 
1905 #define wbsd_pnp_suspend NULL
1906 #define wbsd_pnp_resume NULL
1907 
1908 #endif /* CONFIG_PM */
1909 
1910 static struct platform_device *wbsd_device;
1911 
1912 static struct platform_driver wbsd_driver = {
1913         .probe          = wbsd_probe,
1914         .remove         = wbsd_remove,
1915 
1916         .suspend        = wbsd_platform_suspend,
1917         .resume         = wbsd_platform_resume,
1918         .driver         = {
1919                 .name   = DRIVER_NAME,
1920         },
1921 };
1922 
1923 #ifdef CONFIG_PNP
1924 
1925 static struct pnp_driver wbsd_pnp_driver = {
1926         .name           = DRIVER_NAME,
1927         .id_table       = pnp_dev_table,
1928         .probe          = wbsd_pnp_probe,
1929         .remove         = wbsd_pnp_remove,
1930 
1931         .suspend        = wbsd_pnp_suspend,
1932         .resume         = wbsd_pnp_resume,
1933 };
1934 
1935 #endif /* CONFIG_PNP */
1936 
1937 /*
1938  * Module loading/unloading
1939  */
1940 
1941 static int __init wbsd_drv_init(void)
1942 {
1943         int result;
1944 
1945         pr_info(DRIVER_NAME
1946                 ": Winbond W83L51xD SD/MMC card interface driver\n");
1947         pr_info(DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1948 
1949 #ifdef CONFIG_PNP
1950 
1951         if (!param_nopnp) {
1952                 result = pnp_register_driver(&wbsd_pnp_driver);
1953                 if (result < 0)
1954                         return result;
1955         }
1956 #endif /* CONFIG_PNP */
1957 
1958         if (param_nopnp) {
1959                 result = platform_driver_register(&wbsd_driver);
1960                 if (result < 0)
1961                         return result;
1962 
1963                 wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
1964                 if (!wbsd_device) {
1965                         platform_driver_unregister(&wbsd_driver);
1966                         return -ENOMEM;
1967                 }
1968 
1969                 result = platform_device_add(wbsd_device);
1970                 if (result) {
1971                         platform_device_put(wbsd_device);
1972                         platform_driver_unregister(&wbsd_driver);
1973                         return result;
1974                 }
1975         }
1976 
1977         return 0;
1978 }
1979 
1980 static void __exit wbsd_drv_exit(void)
1981 {
1982 #ifdef CONFIG_PNP
1983 
1984         if (!param_nopnp)
1985                 pnp_unregister_driver(&wbsd_pnp_driver);
1986 
1987 #endif /* CONFIG_PNP */
1988 
1989         if (param_nopnp) {
1990                 platform_device_unregister(wbsd_device);
1991 
1992                 platform_driver_unregister(&wbsd_driver);
1993         }
1994 
1995         DBG("unloaded\n");
1996 }
1997 
1998 module_init(wbsd_drv_init);
1999 module_exit(wbsd_drv_exit);
2000 #ifdef CONFIG_PNP
2001 module_param_named(nopnp, param_nopnp, uint, 0444);
2002 #endif
2003 module_param_named(io, param_io, uint, 0444);
2004 module_param_named(irq, param_irq, uint, 0444);
2005 module_param_named(dma, param_dma, int, 0444);
2006 
2007 MODULE_LICENSE("GPL");
2008 MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
2009 MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");
2010 
2011 #ifdef CONFIG_PNP
2012 MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
2013 #endif
2014 MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
2015 MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
2016 MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");
2017 

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