Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/mmc/host/atmel-mci.c

  1 /*
  2  * Atmel MultiMedia Card Interface driver
  3  *
  4  * Copyright (C) 2004-2008 Atmel Corporation
  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 version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/blkdev.h>
 11 #include <linux/clk.h>
 12 #include <linux/debugfs.h>
 13 #include <linux/device.h>
 14 #include <linux/dmaengine.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/err.h>
 17 #include <linux/gpio.h>
 18 #include <linux/init.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/io.h>
 21 #include <linux/ioport.h>
 22 #include <linux/module.h>
 23 #include <linux/of.h>
 24 #include <linux/of_device.h>
 25 #include <linux/of_gpio.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/scatterlist.h>
 28 #include <linux/seq_file.h>
 29 #include <linux/slab.h>
 30 #include <linux/stat.h>
 31 #include <linux/types.h>
 32 #include <linux/platform_data/atmel.h>
 33 
 34 #include <linux/mmc/host.h>
 35 #include <linux/mmc/sdio.h>
 36 
 37 #include <mach/atmel-mci.h>
 38 #include <linux/atmel-mci.h>
 39 #include <linux/atmel_pdc.h>
 40 
 41 #include <asm/cacheflush.h>
 42 #include <asm/io.h>
 43 #include <asm/unaligned.h>
 44 
 45 #include "atmel-mci-regs.h"
 46 
 47 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
 48 #define ATMCI_DMA_THRESHOLD     16
 49 
 50 enum {
 51         EVENT_CMD_RDY = 0,
 52         EVENT_XFER_COMPLETE,
 53         EVENT_NOTBUSY,
 54         EVENT_DATA_ERROR,
 55 };
 56 
 57 enum atmel_mci_state {
 58         STATE_IDLE = 0,
 59         STATE_SENDING_CMD,
 60         STATE_DATA_XFER,
 61         STATE_WAITING_NOTBUSY,
 62         STATE_SENDING_STOP,
 63         STATE_END_REQUEST,
 64 };
 65 
 66 enum atmci_xfer_dir {
 67         XFER_RECEIVE = 0,
 68         XFER_TRANSMIT,
 69 };
 70 
 71 enum atmci_pdc_buf {
 72         PDC_FIRST_BUF = 0,
 73         PDC_SECOND_BUF,
 74 };
 75 
 76 struct atmel_mci_caps {
 77         bool    has_dma_conf_reg;
 78         bool    has_pdc;
 79         bool    has_cfg_reg;
 80         bool    has_cstor_reg;
 81         bool    has_highspeed;
 82         bool    has_rwproof;
 83         bool    has_odd_clk_div;
 84         bool    has_bad_data_ordering;
 85         bool    need_reset_after_xfer;
 86         bool    need_blksz_mul_4;
 87         bool    need_notbusy_for_read_ops;
 88 };
 89 
 90 struct atmel_mci_dma {
 91         struct dma_chan                 *chan;
 92         struct dma_async_tx_descriptor  *data_desc;
 93 };
 94 
 95 /**
 96  * struct atmel_mci - MMC controller state shared between all slots
 97  * @lock: Spinlock protecting the queue and associated data.
 98  * @regs: Pointer to MMIO registers.
 99  * @sg: Scatterlist entry currently being processed by PIO or PDC code.
100  * @pio_offset: Offset into the current scatterlist entry.
101  * @buffer: Buffer used if we don't have the r/w proof capability. We
102  *      don't have the time to switch pdc buffers so we have to use only
103  *      one buffer for the full transaction.
104  * @buf_size: size of the buffer.
105  * @phys_buf_addr: buffer address needed for pdc.
106  * @cur_slot: The slot which is currently using the controller.
107  * @mrq: The request currently being processed on @cur_slot,
108  *      or NULL if the controller is idle.
109  * @cmd: The command currently being sent to the card, or NULL.
110  * @data: The data currently being transferred, or NULL if no data
111  *      transfer is in progress.
112  * @data_size: just data->blocks * data->blksz.
113  * @dma: DMA client state.
114  * @data_chan: DMA channel being used for the current data transfer.
115  * @cmd_status: Snapshot of SR taken upon completion of the current
116  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
117  * @data_status: Snapshot of SR taken upon completion of the current
118  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
119  *      EVENT_DATA_ERROR is pending.
120  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
121  *      to be sent.
122  * @tasklet: Tasklet running the request state machine.
123  * @pending_events: Bitmask of events flagged by the interrupt handler
124  *      to be processed by the tasklet.
125  * @completed_events: Bitmask of events which the state machine has
126  *      processed.
127  * @state: Tasklet state.
128  * @queue: List of slots waiting for access to the controller.
129  * @need_clock_update: Update the clock rate before the next request.
130  * @need_reset: Reset controller before next request.
131  * @timer: Timer to balance the data timeout error flag which cannot rise.
132  * @mode_reg: Value of the MR register.
133  * @cfg_reg: Value of the CFG register.
134  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
135  *      rate and timeout calculations.
136  * @mapbase: Physical address of the MMIO registers.
137  * @mck: The peripheral bus clock hooked up to the MMC controller.
138  * @pdev: Platform device associated with the MMC controller.
139  * @slot: Slots sharing this MMC controller.
140  * @caps: MCI capabilities depending on MCI version.
141  * @prepare_data: function to setup MCI before data transfer which
142  * depends on MCI capabilities.
143  * @submit_data: function to start data transfer which depends on MCI
144  * capabilities.
145  * @stop_transfer: function to stop data transfer which depends on MCI
146  * capabilities.
147  *
148  * Locking
149  * =======
150  *
151  * @lock is a softirq-safe spinlock protecting @queue as well as
152  * @cur_slot, @mrq and @state. These must always be updated
153  * at the same time while holding @lock.
154  *
155  * @lock also protects mode_reg and need_clock_update since these are
156  * used to synchronize mode register updates with the queue
157  * processing.
158  *
159  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
160  * and must always be written at the same time as the slot is added to
161  * @queue.
162  *
163  * @pending_events and @completed_events are accessed using atomic bit
164  * operations, so they don't need any locking.
165  *
166  * None of the fields touched by the interrupt handler need any
167  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
168  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
169  * interrupts must be disabled and @data_status updated with a
170  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
171  * CMDRDY interrupt must be disabled and @cmd_status updated with a
172  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
173  * bytes_xfered field of @data must be written. This is ensured by
174  * using barriers.
175  */
176 struct atmel_mci {
177         spinlock_t              lock;
178         void __iomem            *regs;
179 
180         struct scatterlist      *sg;
181         unsigned int            sg_len;
182         unsigned int            pio_offset;
183         unsigned int            *buffer;
184         unsigned int            buf_size;
185         dma_addr_t              buf_phys_addr;
186 
187         struct atmel_mci_slot   *cur_slot;
188         struct mmc_request      *mrq;
189         struct mmc_command      *cmd;
190         struct mmc_data         *data;
191         unsigned int            data_size;
192 
193         struct atmel_mci_dma    dma;
194         struct dma_chan         *data_chan;
195         struct dma_slave_config dma_conf;
196 
197         u32                     cmd_status;
198         u32                     data_status;
199         u32                     stop_cmdr;
200 
201         struct tasklet_struct   tasklet;
202         unsigned long           pending_events;
203         unsigned long           completed_events;
204         enum atmel_mci_state    state;
205         struct list_head        queue;
206 
207         bool                    need_clock_update;
208         bool                    need_reset;
209         struct timer_list       timer;
210         u32                     mode_reg;
211         u32                     cfg_reg;
212         unsigned long           bus_hz;
213         unsigned long           mapbase;
214         struct clk              *mck;
215         struct platform_device  *pdev;
216 
217         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
218 
219         struct atmel_mci_caps   caps;
220 
221         u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
222         void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
223         void (*stop_transfer)(struct atmel_mci *host);
224 };
225 
226 /**
227  * struct atmel_mci_slot - MMC slot state
228  * @mmc: The mmc_host representing this slot.
229  * @host: The MMC controller this slot is using.
230  * @sdc_reg: Value of SDCR to be written before using this slot.
231  * @sdio_irq: SDIO irq mask for this slot.
232  * @mrq: mmc_request currently being processed or waiting to be
233  *      processed, or NULL when the slot is idle.
234  * @queue_node: List node for placing this node in the @queue list of
235  *      &struct atmel_mci.
236  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
237  * @flags: Random state bits associated with the slot.
238  * @detect_pin: GPIO pin used for card detection, or negative if not
239  *      available.
240  * @wp_pin: GPIO pin used for card write protect sending, or negative
241  *      if not available.
242  * @detect_is_active_high: The state of the detect pin when it is active.
243  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
244  */
245 struct atmel_mci_slot {
246         struct mmc_host         *mmc;
247         struct atmel_mci        *host;
248 
249         u32                     sdc_reg;
250         u32                     sdio_irq;
251 
252         struct mmc_request      *mrq;
253         struct list_head        queue_node;
254 
255         unsigned int            clock;
256         unsigned long           flags;
257 #define ATMCI_CARD_PRESENT      0
258 #define ATMCI_CARD_NEED_INIT    1
259 #define ATMCI_SHUTDOWN          2
260 
261         int                     detect_pin;
262         int                     wp_pin;
263         bool                    detect_is_active_high;
264 
265         struct timer_list       detect_timer;
266 };
267 
268 #define atmci_test_and_clear_pending(host, event)               \
269         test_and_clear_bit(event, &host->pending_events)
270 #define atmci_set_completed(host, event)                        \
271         set_bit(event, &host->completed_events)
272 #define atmci_set_pending(host, event)                          \
273         set_bit(event, &host->pending_events)
274 
275 /*
276  * The debugfs stuff below is mostly optimized away when
277  * CONFIG_DEBUG_FS is not set.
278  */
279 static int atmci_req_show(struct seq_file *s, void *v)
280 {
281         struct atmel_mci_slot   *slot = s->private;
282         struct mmc_request      *mrq;
283         struct mmc_command      *cmd;
284         struct mmc_command      *stop;
285         struct mmc_data         *data;
286 
287         /* Make sure we get a consistent snapshot */
288         spin_lock_bh(&slot->host->lock);
289         mrq = slot->mrq;
290 
291         if (mrq) {
292                 cmd = mrq->cmd;
293                 data = mrq->data;
294                 stop = mrq->stop;
295 
296                 if (cmd)
297                         seq_printf(s,
298                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
299                                 cmd->opcode, cmd->arg, cmd->flags,
300                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
301                                 cmd->resp[3], cmd->error);
302                 if (data)
303                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
304                                 data->bytes_xfered, data->blocks,
305                                 data->blksz, data->flags, data->error);
306                 if (stop)
307                         seq_printf(s,
308                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
309                                 stop->opcode, stop->arg, stop->flags,
310                                 stop->resp[0], stop->resp[1], stop->resp[2],
311                                 stop->resp[3], stop->error);
312         }
313 
314         spin_unlock_bh(&slot->host->lock);
315 
316         return 0;
317 }
318 
319 static int atmci_req_open(struct inode *inode, struct file *file)
320 {
321         return single_open(file, atmci_req_show, inode->i_private);
322 }
323 
324 static const struct file_operations atmci_req_fops = {
325         .owner          = THIS_MODULE,
326         .open           = atmci_req_open,
327         .read           = seq_read,
328         .llseek         = seq_lseek,
329         .release        = single_release,
330 };
331 
332 static void atmci_show_status_reg(struct seq_file *s,
333                 const char *regname, u32 value)
334 {
335         static const char       *sr_bit[] = {
336                 [0]     = "CMDRDY",
337                 [1]     = "RXRDY",
338                 [2]     = "TXRDY",
339                 [3]     = "BLKE",
340                 [4]     = "DTIP",
341                 [5]     = "NOTBUSY",
342                 [6]     = "ENDRX",
343                 [7]     = "ENDTX",
344                 [8]     = "SDIOIRQA",
345                 [9]     = "SDIOIRQB",
346                 [12]    = "SDIOWAIT",
347                 [14]    = "RXBUFF",
348                 [15]    = "TXBUFE",
349                 [16]    = "RINDE",
350                 [17]    = "RDIRE",
351                 [18]    = "RCRCE",
352                 [19]    = "RENDE",
353                 [20]    = "RTOE",
354                 [21]    = "DCRCE",
355                 [22]    = "DTOE",
356                 [23]    = "CSTOE",
357                 [24]    = "BLKOVRE",
358                 [25]    = "DMADONE",
359                 [26]    = "FIFOEMPTY",
360                 [27]    = "XFRDONE",
361                 [30]    = "OVRE",
362                 [31]    = "UNRE",
363         };
364         unsigned int            i;
365 
366         seq_printf(s, "%s:\t0x%08x", regname, value);
367         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
368                 if (value & (1 << i)) {
369                         if (sr_bit[i])
370                                 seq_printf(s, " %s", sr_bit[i]);
371                         else
372                                 seq_puts(s, " UNKNOWN");
373                 }
374         }
375         seq_putc(s, '\n');
376 }
377 
378 static int atmci_regs_show(struct seq_file *s, void *v)
379 {
380         struct atmel_mci        *host = s->private;
381         u32                     *buf;
382         int                     ret = 0;
383 
384 
385         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
386         if (!buf)
387                 return -ENOMEM;
388 
389         /*
390          * Grab a more or less consistent snapshot. Note that we're
391          * not disabling interrupts, so IMR and SR may not be
392          * consistent.
393          */
394         ret = clk_prepare_enable(host->mck);
395         if (ret)
396                 goto out;
397 
398         spin_lock_bh(&host->lock);
399         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
400         spin_unlock_bh(&host->lock);
401 
402         clk_disable_unprepare(host->mck);
403 
404         seq_printf(s, "MR:\t0x%08x%s%s ",
405                         buf[ATMCI_MR / 4],
406                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
407                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
408         if (host->caps.has_odd_clk_div)
409                 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
410                                 ((buf[ATMCI_MR / 4] & 0xff) << 1)
411                                 | ((buf[ATMCI_MR / 4] >> 16) & 1));
412         else
413                 seq_printf(s, "CLKDIV=%u\n",
414                                 (buf[ATMCI_MR / 4] & 0xff));
415         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
416         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
417         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
418         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
419                         buf[ATMCI_BLKR / 4],
420                         buf[ATMCI_BLKR / 4] & 0xffff,
421                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
422         if (host->caps.has_cstor_reg)
423                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
424 
425         /* Don't read RSPR and RDR; it will consume the data there */
426 
427         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
428         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
429 
430         if (host->caps.has_dma_conf_reg) {
431                 u32 val;
432 
433                 val = buf[ATMCI_DMA / 4];
434                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
435                                 val, val & 3,
436                                 ((val >> 4) & 3) ?
437                                         1 << (((val >> 4) & 3) + 1) : 1,
438                                 val & ATMCI_DMAEN ? " DMAEN" : "");
439         }
440         if (host->caps.has_cfg_reg) {
441                 u32 val;
442 
443                 val = buf[ATMCI_CFG / 4];
444                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
445                                 val,
446                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
447                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
448                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
449                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
450         }
451 
452 out:
453         kfree(buf);
454 
455         return ret;
456 }
457 
458 static int atmci_regs_open(struct inode *inode, struct file *file)
459 {
460         return single_open(file, atmci_regs_show, inode->i_private);
461 }
462 
463 static const struct file_operations atmci_regs_fops = {
464         .owner          = THIS_MODULE,
465         .open           = atmci_regs_open,
466         .read           = seq_read,
467         .llseek         = seq_lseek,
468         .release        = single_release,
469 };
470 
471 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
472 {
473         struct mmc_host         *mmc = slot->mmc;
474         struct atmel_mci        *host = slot->host;
475         struct dentry           *root;
476         struct dentry           *node;
477 
478         root = mmc->debugfs_root;
479         if (!root)
480                 return;
481 
482         node = debugfs_create_file("regs", S_IRUSR, root, host,
483                         &atmci_regs_fops);
484         if (IS_ERR(node))
485                 return;
486         if (!node)
487                 goto err;
488 
489         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
490         if (!node)
491                 goto err;
492 
493         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
494         if (!node)
495                 goto err;
496 
497         node = debugfs_create_x32("pending_events", S_IRUSR, root,
498                                      (u32 *)&host->pending_events);
499         if (!node)
500                 goto err;
501 
502         node = debugfs_create_x32("completed_events", S_IRUSR, root,
503                                      (u32 *)&host->completed_events);
504         if (!node)
505                 goto err;
506 
507         return;
508 
509 err:
510         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
511 }
512 
513 #if defined(CONFIG_OF)
514 static const struct of_device_id atmci_dt_ids[] = {
515         { .compatible = "atmel,hsmci" },
516         { /* sentinel */ }
517 };
518 
519 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
520 
521 static struct mci_platform_data*
522 atmci_of_init(struct platform_device *pdev)
523 {
524         struct device_node *np = pdev->dev.of_node;
525         struct device_node *cnp;
526         struct mci_platform_data *pdata;
527         u32 slot_id;
528 
529         if (!np) {
530                 dev_err(&pdev->dev, "device node not found\n");
531                 return ERR_PTR(-EINVAL);
532         }
533 
534         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
535         if (!pdata) {
536                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
537                 return ERR_PTR(-ENOMEM);
538         }
539 
540         for_each_child_of_node(np, cnp) {
541                 if (of_property_read_u32(cnp, "reg", &slot_id)) {
542                         dev_warn(&pdev->dev, "reg property is missing for %s\n",
543                                  cnp->full_name);
544                         continue;
545                 }
546 
547                 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
548                         dev_warn(&pdev->dev, "can't have more than %d slots\n",
549                                  ATMCI_MAX_NR_SLOTS);
550                         break;
551                 }
552 
553                 if (of_property_read_u32(cnp, "bus-width",
554                                          &pdata->slot[slot_id].bus_width))
555                         pdata->slot[slot_id].bus_width = 1;
556 
557                 pdata->slot[slot_id].detect_pin =
558                         of_get_named_gpio(cnp, "cd-gpios", 0);
559 
560                 pdata->slot[slot_id].detect_is_active_high =
561                         of_property_read_bool(cnp, "cd-inverted");
562 
563                 pdata->slot[slot_id].wp_pin =
564                         of_get_named_gpio(cnp, "wp-gpios", 0);
565         }
566 
567         return pdata;
568 }
569 #else /* CONFIG_OF */
570 static inline struct mci_platform_data*
571 atmci_of_init(struct platform_device *dev)
572 {
573         return ERR_PTR(-EINVAL);
574 }
575 #endif
576 
577 static inline unsigned int atmci_get_version(struct atmel_mci *host)
578 {
579         return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
580 }
581 
582 static void atmci_timeout_timer(unsigned long data)
583 {
584         struct atmel_mci *host;
585 
586         host = (struct atmel_mci *)data;
587 
588         dev_dbg(&host->pdev->dev, "software timeout\n");
589 
590         if (host->mrq->cmd->data) {
591                 host->mrq->cmd->data->error = -ETIMEDOUT;
592                 host->data = NULL;
593                 /*
594                  * With some SDIO modules, sometimes DMA transfer hangs. If
595                  * stop_transfer() is not called then the DMA request is not
596                  * removed, following ones are queued and never computed.
597                  */
598                 if (host->state == STATE_DATA_XFER)
599                         host->stop_transfer(host);
600         } else {
601                 host->mrq->cmd->error = -ETIMEDOUT;
602                 host->cmd = NULL;
603         }
604         host->need_reset = 1;
605         host->state = STATE_END_REQUEST;
606         smp_wmb();
607         tasklet_schedule(&host->tasklet);
608 }
609 
610 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
611                                         unsigned int ns)
612 {
613         /*
614          * It is easier here to use us instead of ns for the timeout,
615          * it prevents from overflows during calculation.
616          */
617         unsigned int us = DIV_ROUND_UP(ns, 1000);
618 
619         /* Maximum clock frequency is host->bus_hz/2 */
620         return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
621 }
622 
623 static void atmci_set_timeout(struct atmel_mci *host,
624                 struct atmel_mci_slot *slot, struct mmc_data *data)
625 {
626         static unsigned dtomul_to_shift[] = {
627                 0, 4, 7, 8, 10, 12, 16, 20
628         };
629         unsigned        timeout;
630         unsigned        dtocyc;
631         unsigned        dtomul;
632 
633         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
634                 + data->timeout_clks;
635 
636         for (dtomul = 0; dtomul < 8; dtomul++) {
637                 unsigned shift = dtomul_to_shift[dtomul];
638                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
639                 if (dtocyc < 15)
640                         break;
641         }
642 
643         if (dtomul >= 8) {
644                 dtomul = 7;
645                 dtocyc = 15;
646         }
647 
648         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
649                         dtocyc << dtomul_to_shift[dtomul]);
650         atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
651 }
652 
653 /*
654  * Return mask with command flags to be enabled for this command.
655  */
656 static u32 atmci_prepare_command(struct mmc_host *mmc,
657                                  struct mmc_command *cmd)
658 {
659         struct mmc_data *data;
660         u32             cmdr;
661 
662         cmd->error = -EINPROGRESS;
663 
664         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
665 
666         if (cmd->flags & MMC_RSP_PRESENT) {
667                 if (cmd->flags & MMC_RSP_136)
668                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
669                 else
670                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
671         }
672 
673         /*
674          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
675          * it's too difficult to determine whether this is an ACMD or
676          * not. Better make it 64.
677          */
678         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
679 
680         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
681                 cmdr |= ATMCI_CMDR_OPDCMD;
682 
683         data = cmd->data;
684         if (data) {
685                 cmdr |= ATMCI_CMDR_START_XFER;
686 
687                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
688                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
689                 } else {
690                         if (data->flags & MMC_DATA_STREAM)
691                                 cmdr |= ATMCI_CMDR_STREAM;
692                         else if (data->blocks > 1)
693                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
694                         else
695                                 cmdr |= ATMCI_CMDR_BLOCK;
696                 }
697 
698                 if (data->flags & MMC_DATA_READ)
699                         cmdr |= ATMCI_CMDR_TRDIR_READ;
700         }
701 
702         return cmdr;
703 }
704 
705 static void atmci_send_command(struct atmel_mci *host,
706                 struct mmc_command *cmd, u32 cmd_flags)
707 {
708         WARN_ON(host->cmd);
709         host->cmd = cmd;
710 
711         dev_vdbg(&host->pdev->dev,
712                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
713                         cmd->arg, cmd_flags);
714 
715         atmci_writel(host, ATMCI_ARGR, cmd->arg);
716         atmci_writel(host, ATMCI_CMDR, cmd_flags);
717 }
718 
719 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
720 {
721         dev_dbg(&host->pdev->dev, "send stop command\n");
722         atmci_send_command(host, data->stop, host->stop_cmdr);
723         atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
724 }
725 
726 /*
727  * Configure given PDC buffer taking care of alignement issues.
728  * Update host->data_size and host->sg.
729  */
730 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
731         enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
732 {
733         u32 pointer_reg, counter_reg;
734         unsigned int buf_size;
735 
736         if (dir == XFER_RECEIVE) {
737                 pointer_reg = ATMEL_PDC_RPR;
738                 counter_reg = ATMEL_PDC_RCR;
739         } else {
740                 pointer_reg = ATMEL_PDC_TPR;
741                 counter_reg = ATMEL_PDC_TCR;
742         }
743 
744         if (buf_nb == PDC_SECOND_BUF) {
745                 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
746                 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
747         }
748 
749         if (!host->caps.has_rwproof) {
750                 buf_size = host->buf_size;
751                 atmci_writel(host, pointer_reg, host->buf_phys_addr);
752         } else {
753                 buf_size = sg_dma_len(host->sg);
754                 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
755         }
756 
757         if (host->data_size <= buf_size) {
758                 if (host->data_size & 0x3) {
759                         /* If size is different from modulo 4, transfer bytes */
760                         atmci_writel(host, counter_reg, host->data_size);
761                         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
762                 } else {
763                         /* Else transfer 32-bits words */
764                         atmci_writel(host, counter_reg, host->data_size / 4);
765                 }
766                 host->data_size = 0;
767         } else {
768                 /* We assume the size of a page is 32-bits aligned */
769                 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
770                 host->data_size -= sg_dma_len(host->sg);
771                 if (host->data_size)
772                         host->sg = sg_next(host->sg);
773         }
774 }
775 
776 /*
777  * Configure PDC buffer according to the data size ie configuring one or two
778  * buffers. Don't use this function if you want to configure only the second
779  * buffer. In this case, use atmci_pdc_set_single_buf.
780  */
781 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
782 {
783         atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
784         if (host->data_size)
785                 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
786 }
787 
788 /*
789  * Unmap sg lists, called when transfer is finished.
790  */
791 static void atmci_pdc_cleanup(struct atmel_mci *host)
792 {
793         struct mmc_data         *data = host->data;
794 
795         if (data)
796                 dma_unmap_sg(&host->pdev->dev,
797                                 data->sg, data->sg_len,
798                                 ((data->flags & MMC_DATA_WRITE)
799                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
800 }
801 
802 /*
803  * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
804  * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
805  * interrupt needed for both transfer directions.
806  */
807 static void atmci_pdc_complete(struct atmel_mci *host)
808 {
809         int transfer_size = host->data->blocks * host->data->blksz;
810         int i;
811 
812         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
813 
814         if ((!host->caps.has_rwproof)
815             && (host->data->flags & MMC_DATA_READ)) {
816                 if (host->caps.has_bad_data_ordering)
817                         for (i = 0; i < transfer_size; i++)
818                                 host->buffer[i] = swab32(host->buffer[i]);
819                 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
820                                     host->buffer, transfer_size);
821         }
822 
823         atmci_pdc_cleanup(host);
824 
825         dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
826         atmci_set_pending(host, EVENT_XFER_COMPLETE);
827         tasklet_schedule(&host->tasklet);
828 }
829 
830 static void atmci_dma_cleanup(struct atmel_mci *host)
831 {
832         struct mmc_data                 *data = host->data;
833 
834         if (data)
835                 dma_unmap_sg(host->dma.chan->device->dev,
836                                 data->sg, data->sg_len,
837                                 ((data->flags & MMC_DATA_WRITE)
838                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
839 }
840 
841 /*
842  * This function is called by the DMA driver from tasklet context.
843  */
844 static void atmci_dma_complete(void *arg)
845 {
846         struct atmel_mci        *host = arg;
847         struct mmc_data         *data = host->data;
848 
849         dev_vdbg(&host->pdev->dev, "DMA complete\n");
850 
851         if (host->caps.has_dma_conf_reg)
852                 /* Disable DMA hardware handshaking on MCI */
853                 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
854 
855         atmci_dma_cleanup(host);
856 
857         /*
858          * If the card was removed, data will be NULL. No point trying
859          * to send the stop command or waiting for NBUSY in this case.
860          */
861         if (data) {
862                 dev_dbg(&host->pdev->dev,
863                         "(%s) set pending xfer complete\n", __func__);
864                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
865                 tasklet_schedule(&host->tasklet);
866 
867                 /*
868                  * Regardless of what the documentation says, we have
869                  * to wait for NOTBUSY even after block read
870                  * operations.
871                  *
872                  * When the DMA transfer is complete, the controller
873                  * may still be reading the CRC from the card, i.e.
874                  * the data transfer is still in progress and we
875                  * haven't seen all the potential error bits yet.
876                  *
877                  * The interrupt handler will schedule a different
878                  * tasklet to finish things up when the data transfer
879                  * is completely done.
880                  *
881                  * We may not complete the mmc request here anyway
882                  * because the mmc layer may call back and cause us to
883                  * violate the "don't submit new operations from the
884                  * completion callback" rule of the dma engine
885                  * framework.
886                  */
887                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
888         }
889 }
890 
891 /*
892  * Returns a mask of interrupt flags to be enabled after the whole
893  * request has been prepared.
894  */
895 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
896 {
897         u32 iflags;
898 
899         data->error = -EINPROGRESS;
900 
901         host->sg = data->sg;
902         host->sg_len = data->sg_len;
903         host->data = data;
904         host->data_chan = NULL;
905 
906         iflags = ATMCI_DATA_ERROR_FLAGS;
907 
908         /*
909          * Errata: MMC data write operation with less than 12
910          * bytes is impossible.
911          *
912          * Errata: MCI Transmit Data Register (TDR) FIFO
913          * corruption when length is not multiple of 4.
914          */
915         if (data->blocks * data->blksz < 12
916                         || (data->blocks * data->blksz) & 3)
917                 host->need_reset = true;
918 
919         host->pio_offset = 0;
920         if (data->flags & MMC_DATA_READ)
921                 iflags |= ATMCI_RXRDY;
922         else
923                 iflags |= ATMCI_TXRDY;
924 
925         return iflags;
926 }
927 
928 /*
929  * Set interrupt flags and set block length into the MCI mode register even
930  * if this value is also accessible in the MCI block register. It seems to be
931  * necessary before the High Speed MCI version. It also map sg and configure
932  * PDC registers.
933  */
934 static u32
935 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
936 {
937         u32 iflags, tmp;
938         unsigned int sg_len;
939         enum dma_data_direction dir;
940         int i;
941 
942         data->error = -EINPROGRESS;
943 
944         host->data = data;
945         host->sg = data->sg;
946         iflags = ATMCI_DATA_ERROR_FLAGS;
947 
948         /* Enable pdc mode */
949         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
950 
951         if (data->flags & MMC_DATA_READ) {
952                 dir = DMA_FROM_DEVICE;
953                 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
954         } else {
955                 dir = DMA_TO_DEVICE;
956                 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
957         }
958 
959         /* Set BLKLEN */
960         tmp = atmci_readl(host, ATMCI_MR);
961         tmp &= 0x0000ffff;
962         tmp |= ATMCI_BLKLEN(data->blksz);
963         atmci_writel(host, ATMCI_MR, tmp);
964 
965         /* Configure PDC */
966         host->data_size = data->blocks * data->blksz;
967         sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
968 
969         if ((!host->caps.has_rwproof)
970             && (host->data->flags & MMC_DATA_WRITE)) {
971                 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
972                                   host->buffer, host->data_size);
973                 if (host->caps.has_bad_data_ordering)
974                         for (i = 0; i < host->data_size; i++)
975                                 host->buffer[i] = swab32(host->buffer[i]);
976         }
977 
978         if (host->data_size)
979                 atmci_pdc_set_both_buf(host,
980                         ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
981 
982         return iflags;
983 }
984 
985 static u32
986 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
987 {
988         struct dma_chan                 *chan;
989         struct dma_async_tx_descriptor  *desc;
990         struct scatterlist              *sg;
991         unsigned int                    i;
992         enum dma_data_direction         direction;
993         enum dma_transfer_direction     slave_dirn;
994         unsigned int                    sglen;
995         u32                             maxburst;
996         u32 iflags;
997 
998         data->error = -EINPROGRESS;
999 
1000         WARN_ON(host->data);
1001         host->sg = NULL;
1002         host->data = data;
1003 
1004         iflags = ATMCI_DATA_ERROR_FLAGS;
1005 
1006         /*
1007          * We don't do DMA on "complex" transfers, i.e. with
1008          * non-word-aligned buffers or lengths. Also, we don't bother
1009          * with all the DMA setup overhead for short transfers.
1010          */
1011         if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1012                 return atmci_prepare_data(host, data);
1013         if (data->blksz & 3)
1014                 return atmci_prepare_data(host, data);
1015 
1016         for_each_sg(data->sg, sg, data->sg_len, i) {
1017                 if (sg->offset & 3 || sg->length & 3)
1018                         return atmci_prepare_data(host, data);
1019         }
1020 
1021         /* If we don't have a channel, we can't do DMA */
1022         chan = host->dma.chan;
1023         if (chan)
1024                 host->data_chan = chan;
1025 
1026         if (!chan)
1027                 return -ENODEV;
1028 
1029         if (data->flags & MMC_DATA_READ) {
1030                 direction = DMA_FROM_DEVICE;
1031                 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1032                 maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
1033         } else {
1034                 direction = DMA_TO_DEVICE;
1035                 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1036                 maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
1037         }
1038 
1039         if (host->caps.has_dma_conf_reg)
1040                 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1041                         ATMCI_DMAEN);
1042 
1043         sglen = dma_map_sg(chan->device->dev, data->sg,
1044                         data->sg_len, direction);
1045 
1046         dmaengine_slave_config(chan, &host->dma_conf);
1047         desc = dmaengine_prep_slave_sg(chan,
1048                         data->sg, sglen, slave_dirn,
1049                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1050         if (!desc)
1051                 goto unmap_exit;
1052 
1053         host->dma.data_desc = desc;
1054         desc->callback = atmci_dma_complete;
1055         desc->callback_param = host;
1056 
1057         return iflags;
1058 unmap_exit:
1059         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1060         return -ENOMEM;
1061 }
1062 
1063 static void
1064 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1065 {
1066         return;
1067 }
1068 
1069 /*
1070  * Start PDC according to transfer direction.
1071  */
1072 static void
1073 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1074 {
1075         if (data->flags & MMC_DATA_READ)
1076                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1077         else
1078                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1079 }
1080 
1081 static void
1082 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1083 {
1084         struct dma_chan                 *chan = host->data_chan;
1085         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
1086 
1087         if (chan) {
1088                 dmaengine_submit(desc);
1089                 dma_async_issue_pending(chan);
1090         }
1091 }
1092 
1093 static void atmci_stop_transfer(struct atmel_mci *host)
1094 {
1095         dev_dbg(&host->pdev->dev,
1096                 "(%s) set pending xfer complete\n", __func__);
1097         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1098         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1099 }
1100 
1101 /*
1102  * Stop data transfer because error(s) occurred.
1103  */
1104 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1105 {
1106         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1107 }
1108 
1109 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1110 {
1111         struct dma_chan *chan = host->data_chan;
1112 
1113         if (chan) {
1114                 dmaengine_terminate_all(chan);
1115                 atmci_dma_cleanup(host);
1116         } else {
1117                 /* Data transfer was stopped by the interrupt handler */
1118                 dev_dbg(&host->pdev->dev,
1119                         "(%s) set pending xfer complete\n", __func__);
1120                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1121                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1122         }
1123 }
1124 
1125 /*
1126  * Start a request: prepare data if needed, prepare the command and activate
1127  * interrupts.
1128  */
1129 static void atmci_start_request(struct atmel_mci *host,
1130                 struct atmel_mci_slot *slot)
1131 {
1132         struct mmc_request      *mrq;
1133         struct mmc_command      *cmd;
1134         struct mmc_data         *data;
1135         u32                     iflags;
1136         u32                     cmdflags;
1137 
1138         mrq = slot->mrq;
1139         host->cur_slot = slot;
1140         host->mrq = mrq;
1141 
1142         host->pending_events = 0;
1143         host->completed_events = 0;
1144         host->cmd_status = 0;
1145         host->data_status = 0;
1146 
1147         dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1148 
1149         if (host->need_reset || host->caps.need_reset_after_xfer) {
1150                 iflags = atmci_readl(host, ATMCI_IMR);
1151                 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1152                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1153                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1154                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1155                 if (host->caps.has_cfg_reg)
1156                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1157                 atmci_writel(host, ATMCI_IER, iflags);
1158                 host->need_reset = false;
1159         }
1160         atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1161 
1162         iflags = atmci_readl(host, ATMCI_IMR);
1163         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1164                 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1165                                 iflags);
1166 
1167         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1168                 /* Send init sequence (74 clock cycles) */
1169                 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1170                 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1171                         cpu_relax();
1172         }
1173         iflags = 0;
1174         data = mrq->data;
1175         if (data) {
1176                 atmci_set_timeout(host, slot, data);
1177 
1178                 /* Must set block count/size before sending command */
1179                 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1180                                 | ATMCI_BLKLEN(data->blksz));
1181                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1182                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1183 
1184                 iflags |= host->prepare_data(host, data);
1185         }
1186 
1187         iflags |= ATMCI_CMDRDY;
1188         cmd = mrq->cmd;
1189         cmdflags = atmci_prepare_command(slot->mmc, cmd);
1190 
1191         /*
1192          * DMA transfer should be started before sending the command to avoid
1193          * unexpected errors especially for read operations in SDIO mode.
1194          * Unfortunately, in PDC mode, command has to be sent before starting
1195          * the transfer.
1196          */
1197         if (host->submit_data != &atmci_submit_data_dma)
1198                 atmci_send_command(host, cmd, cmdflags);
1199 
1200         if (data)
1201                 host->submit_data(host, data);
1202 
1203         if (host->submit_data == &atmci_submit_data_dma)
1204                 atmci_send_command(host, cmd, cmdflags);
1205 
1206         if (mrq->stop) {
1207                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1208                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1209                 if (!(data->flags & MMC_DATA_WRITE))
1210                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1211                 if (data->flags & MMC_DATA_STREAM)
1212                         host->stop_cmdr |= ATMCI_CMDR_STREAM;
1213                 else
1214                         host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1215         }
1216 
1217         /*
1218          * We could have enabled interrupts earlier, but I suspect
1219          * that would open up a nice can of interesting race
1220          * conditions (e.g. command and data complete, but stop not
1221          * prepared yet.)
1222          */
1223         atmci_writel(host, ATMCI_IER, iflags);
1224 
1225         mod_timer(&host->timer, jiffies +  msecs_to_jiffies(2000));
1226 }
1227 
1228 static void atmci_queue_request(struct atmel_mci *host,
1229                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1230 {
1231         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1232                         host->state);
1233 
1234         spin_lock_bh(&host->lock);
1235         slot->mrq = mrq;
1236         if (host->state == STATE_IDLE) {
1237                 host->state = STATE_SENDING_CMD;
1238                 atmci_start_request(host, slot);
1239         } else {
1240                 dev_dbg(&host->pdev->dev, "queue request\n");
1241                 list_add_tail(&slot->queue_node, &host->queue);
1242         }
1243         spin_unlock_bh(&host->lock);
1244 }
1245 
1246 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1247 {
1248         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1249         struct atmel_mci        *host = slot->host;
1250         struct mmc_data         *data;
1251 
1252         WARN_ON(slot->mrq);
1253         dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1254 
1255         /*
1256          * We may "know" the card is gone even though there's still an
1257          * electrical connection. If so, we really need to communicate
1258          * this to the MMC core since there won't be any more
1259          * interrupts as the card is completely removed. Otherwise,
1260          * the MMC core might believe the card is still there even
1261          * though the card was just removed very slowly.
1262          */
1263         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1264                 mrq->cmd->error = -ENOMEDIUM;
1265                 mmc_request_done(mmc, mrq);
1266                 return;
1267         }
1268 
1269         /* We don't support multiple blocks of weird lengths. */
1270         data = mrq->data;
1271         if (data && data->blocks > 1 && data->blksz & 3) {
1272                 mrq->cmd->error = -EINVAL;
1273                 mmc_request_done(mmc, mrq);
1274         }
1275 
1276         atmci_queue_request(host, slot, mrq);
1277 }
1278 
1279 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1280 {
1281         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1282         struct atmel_mci        *host = slot->host;
1283         unsigned int            i;
1284         bool                    unprepare_clk;
1285 
1286         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1287         switch (ios->bus_width) {
1288         case MMC_BUS_WIDTH_1:
1289                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1290                 break;
1291         case MMC_BUS_WIDTH_4:
1292                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1293                 break;
1294         }
1295 
1296         if (ios->clock) {
1297                 unsigned int clock_min = ~0U;
1298                 u32 clkdiv;
1299 
1300                 clk_prepare(host->mck);
1301                 unprepare_clk = true;
1302 
1303                 spin_lock_bh(&host->lock);
1304                 if (!host->mode_reg) {
1305                         clk_enable(host->mck);
1306                         unprepare_clk = false;
1307                         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1308                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1309                         if (host->caps.has_cfg_reg)
1310                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1311                 }
1312 
1313                 /*
1314                  * Use mirror of ios->clock to prevent race with mmc
1315                  * core ios update when finding the minimum.
1316                  */
1317                 slot->clock = ios->clock;
1318                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1319                         if (host->slot[i] && host->slot[i]->clock
1320                                         && host->slot[i]->clock < clock_min)
1321                                 clock_min = host->slot[i]->clock;
1322                 }
1323 
1324                 /* Calculate clock divider */
1325                 if (host->caps.has_odd_clk_div) {
1326                         clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1327                         if (clkdiv > 511) {
1328                                 dev_warn(&mmc->class_dev,
1329                                          "clock %u too slow; using %lu\n",
1330                                          clock_min, host->bus_hz / (511 + 2));
1331                                 clkdiv = 511;
1332                         }
1333                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1334                                          | ATMCI_MR_CLKODD(clkdiv & 1);
1335                 } else {
1336                         clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1337                         if (clkdiv > 255) {
1338                                 dev_warn(&mmc->class_dev,
1339                                          "clock %u too slow; using %lu\n",
1340                                          clock_min, host->bus_hz / (2 * 256));
1341                                 clkdiv = 255;
1342                         }
1343                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1344                 }
1345 
1346                 /*
1347                  * WRPROOF and RDPROOF prevent overruns/underruns by
1348                  * stopping the clock when the FIFO is full/empty.
1349                  * This state is not expected to last for long.
1350                  */
1351                 if (host->caps.has_rwproof)
1352                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1353 
1354                 if (host->caps.has_cfg_reg) {
1355                         /* setup High Speed mode in relation with card capacity */
1356                         if (ios->timing == MMC_TIMING_SD_HS)
1357                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
1358                         else
1359                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1360                 }
1361 
1362                 if (list_empty(&host->queue)) {
1363                         atmci_writel(host, ATMCI_MR, host->mode_reg);
1364                         if (host->caps.has_cfg_reg)
1365                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1366                 } else {
1367                         host->need_clock_update = true;
1368                 }
1369 
1370                 spin_unlock_bh(&host->lock);
1371         } else {
1372                 bool any_slot_active = false;
1373 
1374                 unprepare_clk = false;
1375 
1376                 spin_lock_bh(&host->lock);
1377                 slot->clock = 0;
1378                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1379                         if (host->slot[i] && host->slot[i]->clock) {
1380                                 any_slot_active = true;
1381                                 break;
1382                         }
1383                 }
1384                 if (!any_slot_active) {
1385                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1386                         if (host->mode_reg) {
1387                                 atmci_readl(host, ATMCI_MR);
1388                                 clk_disable(host->mck);
1389                                 unprepare_clk = true;
1390                         }
1391                         host->mode_reg = 0;
1392                 }
1393                 spin_unlock_bh(&host->lock);
1394         }
1395 
1396         if (unprepare_clk)
1397                 clk_unprepare(host->mck);
1398 
1399         switch (ios->power_mode) {
1400         case MMC_POWER_OFF:
1401                 if (!IS_ERR(mmc->supply.vmmc))
1402                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1403                 break;
1404         case MMC_POWER_UP:
1405                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1406                 if (!IS_ERR(mmc->supply.vmmc))
1407                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1408                 break;
1409         default:
1410                 /*
1411                  * TODO: None of the currently available AVR32-based
1412                  * boards allow MMC power to be turned off. Implement
1413                  * power control when this can be tested properly.
1414                  *
1415                  * We also need to hook this into the clock management
1416                  * somehow so that newly inserted cards aren't
1417                  * subjected to a fast clock before we have a chance
1418                  * to figure out what the maximum rate is. Currently,
1419                  * there's no way to avoid this, and there never will
1420                  * be for boards that don't support power control.
1421                  */
1422                 break;
1423         }
1424 }
1425 
1426 static int atmci_get_ro(struct mmc_host *mmc)
1427 {
1428         int                     read_only = -ENOSYS;
1429         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1430 
1431         if (gpio_is_valid(slot->wp_pin)) {
1432                 read_only = gpio_get_value(slot->wp_pin);
1433                 dev_dbg(&mmc->class_dev, "card is %s\n",
1434                                 read_only ? "read-only" : "read-write");
1435         }
1436 
1437         return read_only;
1438 }
1439 
1440 static int atmci_get_cd(struct mmc_host *mmc)
1441 {
1442         int                     present = -ENOSYS;
1443         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1444 
1445         if (gpio_is_valid(slot->detect_pin)) {
1446                 present = !(gpio_get_value(slot->detect_pin) ^
1447                             slot->detect_is_active_high);
1448                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1449                                 present ? "" : "not ");
1450         }
1451 
1452         return present;
1453 }
1454 
1455 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1456 {
1457         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1458         struct atmel_mci        *host = slot->host;
1459 
1460         if (enable)
1461                 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1462         else
1463                 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1464 }
1465 
1466 static const struct mmc_host_ops atmci_ops = {
1467         .request        = atmci_request,
1468         .set_ios        = atmci_set_ios,
1469         .get_ro         = atmci_get_ro,
1470         .get_cd         = atmci_get_cd,
1471         .enable_sdio_irq = atmci_enable_sdio_irq,
1472 };
1473 
1474 /* Called with host->lock held */
1475 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1476         __releases(&host->lock)
1477         __acquires(&host->lock)
1478 {
1479         struct atmel_mci_slot   *slot = NULL;
1480         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1481 
1482         WARN_ON(host->cmd || host->data);
1483 
1484         /*
1485          * Update the MMC clock rate if necessary. This may be
1486          * necessary if set_ios() is called when a different slot is
1487          * busy transferring data.
1488          */
1489         if (host->need_clock_update) {
1490                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1491                 if (host->caps.has_cfg_reg)
1492                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1493         }
1494 
1495         host->cur_slot->mrq = NULL;
1496         host->mrq = NULL;
1497         if (!list_empty(&host->queue)) {
1498                 slot = list_entry(host->queue.next,
1499                                 struct atmel_mci_slot, queue_node);
1500                 list_del(&slot->queue_node);
1501                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1502                                 mmc_hostname(slot->mmc));
1503                 host->state = STATE_SENDING_CMD;
1504                 atmci_start_request(host, slot);
1505         } else {
1506                 dev_vdbg(&host->pdev->dev, "list empty\n");
1507                 host->state = STATE_IDLE;
1508         }
1509 
1510         del_timer(&host->timer);
1511 
1512         spin_unlock(&host->lock);
1513         mmc_request_done(prev_mmc, mrq);
1514         spin_lock(&host->lock);
1515 }
1516 
1517 static void atmci_command_complete(struct atmel_mci *host,
1518                         struct mmc_command *cmd)
1519 {
1520         u32             status = host->cmd_status;
1521 
1522         /* Read the response from the card (up to 16 bytes) */
1523         cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1524         cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1525         cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1526         cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1527 
1528         if (status & ATMCI_RTOE)
1529                 cmd->error = -ETIMEDOUT;
1530         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1531                 cmd->error = -EILSEQ;
1532         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1533                 cmd->error = -EIO;
1534         else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1535                 if (host->caps.need_blksz_mul_4) {
1536                         cmd->error = -EINVAL;
1537                         host->need_reset = 1;
1538                 }
1539         } else
1540                 cmd->error = 0;
1541 }
1542 
1543 static void atmci_detect_change(unsigned long data)
1544 {
1545         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
1546         bool                    present;
1547         bool                    present_old;
1548 
1549         /*
1550          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1551          * freeing the interrupt. We must not re-enable the interrupt
1552          * if it has been freed, and if we're shutting down, it
1553          * doesn't really matter whether the card is present or not.
1554          */
1555         smp_rmb();
1556         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1557                 return;
1558 
1559         enable_irq(gpio_to_irq(slot->detect_pin));
1560         present = !(gpio_get_value(slot->detect_pin) ^
1561                     slot->detect_is_active_high);
1562         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1563 
1564         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1565                         present, present_old);
1566 
1567         if (present != present_old) {
1568                 struct atmel_mci        *host = slot->host;
1569                 struct mmc_request      *mrq;
1570 
1571                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1572                         present ? "inserted" : "removed");
1573 
1574                 spin_lock(&host->lock);
1575 
1576                 if (!present)
1577                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1578                 else
1579                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1580 
1581                 /* Clean up queue if present */
1582                 mrq = slot->mrq;
1583                 if (mrq) {
1584                         if (mrq == host->mrq) {
1585                                 /*
1586                                  * Reset controller to terminate any ongoing
1587                                  * commands or data transfers.
1588                                  */
1589                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1590                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1591                                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1592                                 if (host->caps.has_cfg_reg)
1593                                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1594 
1595                                 host->data = NULL;
1596                                 host->cmd = NULL;
1597 
1598                                 switch (host->state) {
1599                                 case STATE_IDLE:
1600                                         break;
1601                                 case STATE_SENDING_CMD:
1602                                         mrq->cmd->error = -ENOMEDIUM;
1603                                         if (mrq->data)
1604                                                 host->stop_transfer(host);
1605                                         break;
1606                                 case STATE_DATA_XFER:
1607                                         mrq->data->error = -ENOMEDIUM;
1608                                         host->stop_transfer(host);
1609                                         break;
1610                                 case STATE_WAITING_NOTBUSY:
1611                                         mrq->data->error = -ENOMEDIUM;
1612                                         break;
1613                                 case STATE_SENDING_STOP:
1614                                         mrq->stop->error = -ENOMEDIUM;
1615                                         break;
1616                                 case STATE_END_REQUEST:
1617                                         break;
1618                                 }
1619 
1620                                 atmci_request_end(host, mrq);
1621                         } else {
1622                                 list_del(&slot->queue_node);
1623                                 mrq->cmd->error = -ENOMEDIUM;
1624                                 if (mrq->data)
1625                                         mrq->data->error = -ENOMEDIUM;
1626                                 if (mrq->stop)
1627                                         mrq->stop->error = -ENOMEDIUM;
1628 
1629                                 spin_unlock(&host->lock);
1630                                 mmc_request_done(slot->mmc, mrq);
1631                                 spin_lock(&host->lock);
1632                         }
1633                 }
1634                 spin_unlock(&host->lock);
1635 
1636                 mmc_detect_change(slot->mmc, 0);
1637         }
1638 }
1639 
1640 static void atmci_tasklet_func(unsigned long priv)
1641 {
1642         struct atmel_mci        *host = (struct atmel_mci *)priv;
1643         struct mmc_request      *mrq = host->mrq;
1644         struct mmc_data         *data = host->data;
1645         enum atmel_mci_state    state = host->state;
1646         enum atmel_mci_state    prev_state;
1647         u32                     status;
1648 
1649         spin_lock(&host->lock);
1650 
1651         state = host->state;
1652 
1653         dev_vdbg(&host->pdev->dev,
1654                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1655                 state, host->pending_events, host->completed_events,
1656                 atmci_readl(host, ATMCI_IMR));
1657 
1658         do {
1659                 prev_state = state;
1660                 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1661 
1662                 switch (state) {
1663                 case STATE_IDLE:
1664                         break;
1665 
1666                 case STATE_SENDING_CMD:
1667                         /*
1668                          * Command has been sent, we are waiting for command
1669                          * ready. Then we have three next states possible:
1670                          * END_REQUEST by default, WAITING_NOTBUSY if it's a
1671                          * command needing it or DATA_XFER if there is data.
1672                          */
1673                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1674                         if (!atmci_test_and_clear_pending(host,
1675                                                 EVENT_CMD_RDY))
1676                                 break;
1677 
1678                         dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1679                         host->cmd = NULL;
1680                         atmci_set_completed(host, EVENT_CMD_RDY);
1681                         atmci_command_complete(host, mrq->cmd);
1682                         if (mrq->data) {
1683                                 dev_dbg(&host->pdev->dev,
1684                                         "command with data transfer");
1685                                 /*
1686                                  * If there is a command error don't start
1687                                  * data transfer.
1688                                  */
1689                                 if (mrq->cmd->error) {
1690                                         host->stop_transfer(host);
1691                                         host->data = NULL;
1692                                         atmci_writel(host, ATMCI_IDR,
1693                                                      ATMCI_TXRDY | ATMCI_RXRDY
1694                                                      | ATMCI_DATA_ERROR_FLAGS);
1695                                         state = STATE_END_REQUEST;
1696                                 } else
1697                                         state = STATE_DATA_XFER;
1698                         } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1699                                 dev_dbg(&host->pdev->dev,
1700                                         "command response need waiting notbusy");
1701                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1702                                 state = STATE_WAITING_NOTBUSY;
1703                         } else
1704                                 state = STATE_END_REQUEST;
1705 
1706                         break;
1707 
1708                 case STATE_DATA_XFER:
1709                         if (atmci_test_and_clear_pending(host,
1710                                                 EVENT_DATA_ERROR)) {
1711                                 dev_dbg(&host->pdev->dev, "set completed data error\n");
1712                                 atmci_set_completed(host, EVENT_DATA_ERROR);
1713                                 state = STATE_END_REQUEST;
1714                                 break;
1715                         }
1716 
1717                         /*
1718                          * A data transfer is in progress. The event expected
1719                          * to move to the next state depends of data transfer
1720                          * type (PDC or DMA). Once transfer done we can move
1721                          * to the next step which is WAITING_NOTBUSY in write
1722                          * case and directly SENDING_STOP in read case.
1723                          */
1724                         dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1725                         if (!atmci_test_and_clear_pending(host,
1726                                                 EVENT_XFER_COMPLETE))
1727                                 break;
1728 
1729                         dev_dbg(&host->pdev->dev,
1730                                 "(%s) set completed xfer complete\n",
1731                                 __func__);
1732                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1733 
1734                         if (host->caps.need_notbusy_for_read_ops ||
1735                            (host->data->flags & MMC_DATA_WRITE)) {
1736                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1737                                 state = STATE_WAITING_NOTBUSY;
1738                         } else if (host->mrq->stop) {
1739                                 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1740                                 atmci_send_stop_cmd(host, data);
1741                                 state = STATE_SENDING_STOP;
1742                         } else {
1743                                 host->data = NULL;
1744                                 data->bytes_xfered = data->blocks * data->blksz;
1745                                 data->error = 0;
1746                                 state = STATE_END_REQUEST;
1747                         }
1748                         break;
1749 
1750                 case STATE_WAITING_NOTBUSY:
1751                         /*
1752                          * We can be in the state for two reasons: a command
1753                          * requiring waiting not busy signal (stop command
1754                          * included) or a write operation. In the latest case,
1755                          * we need to send a stop command.
1756                          */
1757                         dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1758                         if (!atmci_test_and_clear_pending(host,
1759                                                 EVENT_NOTBUSY))
1760                                 break;
1761 
1762                         dev_dbg(&host->pdev->dev, "set completed not busy\n");
1763                         atmci_set_completed(host, EVENT_NOTBUSY);
1764 
1765                         if (host->data) {
1766                                 /*
1767                                  * For some commands such as CMD53, even if
1768                                  * there is data transfer, there is no stop
1769                                  * command to send.
1770                                  */
1771                                 if (host->mrq->stop) {
1772                                         atmci_writel(host, ATMCI_IER,
1773                                                      ATMCI_CMDRDY);
1774                                         atmci_send_stop_cmd(host, data);
1775                                         state = STATE_SENDING_STOP;
1776                                 } else {
1777                                         host->data = NULL;
1778                                         data->bytes_xfered = data->blocks
1779                                                              * data->blksz;
1780                                         data->error = 0;
1781                                         state = STATE_END_REQUEST;
1782                                 }
1783                         } else
1784                                 state = STATE_END_REQUEST;
1785                         break;
1786 
1787                 case STATE_SENDING_STOP:
1788                         /*
1789                          * In this state, it is important to set host->data to
1790                          * NULL (which is tested in the waiting notbusy state)
1791                          * in order to go to the end request state instead of
1792                          * sending stop again.
1793                          */
1794                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1795                         if (!atmci_test_and_clear_pending(host,
1796                                                 EVENT_CMD_RDY))
1797                                 break;
1798 
1799                         dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1800                         host->cmd = NULL;
1801                         data->bytes_xfered = data->blocks * data->blksz;
1802                         data->error = 0;
1803                         atmci_command_complete(host, mrq->stop);
1804                         if (mrq->stop->error) {
1805                                 host->stop_transfer(host);
1806                                 atmci_writel(host, ATMCI_IDR,
1807                                              ATMCI_TXRDY | ATMCI_RXRDY
1808                                              | ATMCI_DATA_ERROR_FLAGS);
1809                                 state = STATE_END_REQUEST;
1810                         } else {
1811                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1812                                 state = STATE_WAITING_NOTBUSY;
1813                         }
1814                         host->data = NULL;
1815                         break;
1816 
1817                 case STATE_END_REQUEST:
1818                         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1819                                            | ATMCI_DATA_ERROR_FLAGS);
1820                         status = host->data_status;
1821                         if (unlikely(status)) {
1822                                 host->stop_transfer(host);
1823                                 host->data = NULL;
1824                                 if (data) {
1825                                         if (status & ATMCI_DTOE) {
1826                                                 data->error = -ETIMEDOUT;
1827                                         } else if (status & ATMCI_DCRCE) {
1828                                                 data->error = -EILSEQ;
1829                                         } else {
1830                                                 data->error = -EIO;
1831                                         }
1832                                 }
1833                         }
1834 
1835                         atmci_request_end(host, host->mrq);
1836                         state = STATE_IDLE;
1837                         break;
1838                 }
1839         } while (state != prev_state);
1840 
1841         host->state = state;
1842 
1843         spin_unlock(&host->lock);
1844 }
1845 
1846 static void atmci_read_data_pio(struct atmel_mci *host)
1847 {
1848         struct scatterlist      *sg = host->sg;
1849         void                    *buf = sg_virt(sg);
1850         unsigned int            offset = host->pio_offset;
1851         struct mmc_data         *data = host->data;
1852         u32                     value;
1853         u32                     status;
1854         unsigned int            nbytes = 0;
1855 
1856         do {
1857                 value = atmci_readl(host, ATMCI_RDR);
1858                 if (likely(offset + 4 <= sg->length)) {
1859                         put_unaligned(value, (u32 *)(buf + offset));
1860 
1861                         offset += 4;
1862                         nbytes += 4;
1863 
1864                         if (offset == sg->length) {
1865                                 flush_dcache_page(sg_page(sg));
1866                                 host->sg = sg = sg_next(sg);
1867                                 host->sg_len--;
1868                                 if (!sg || !host->sg_len)
1869                                         goto done;
1870 
1871                                 offset = 0;
1872                                 buf = sg_virt(sg);
1873                         }
1874                 } else {
1875                         unsigned int remaining = sg->length - offset;
1876                         memcpy(buf + offset, &value, remaining);
1877                         nbytes += remaining;
1878 
1879                         flush_dcache_page(sg_page(sg));
1880                         host->sg = sg = sg_next(sg);
1881                         host->sg_len--;
1882                         if (!sg || !host->sg_len)
1883                                 goto done;
1884 
1885                         offset = 4 - remaining;
1886                         buf = sg_virt(sg);
1887                         memcpy(buf, (u8 *)&value + remaining, offset);
1888                         nbytes += offset;
1889                 }
1890 
1891                 status = atmci_readl(host, ATMCI_SR);
1892                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1893                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1894                                                 | ATMCI_DATA_ERROR_FLAGS));
1895                         host->data_status = status;
1896                         data->bytes_xfered += nbytes;
1897                         return;
1898                 }
1899         } while (status & ATMCI_RXRDY);
1900 
1901         host->pio_offset = offset;
1902         data->bytes_xfered += nbytes;
1903 
1904         return;
1905 
1906 done:
1907         atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1908         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1909         data->bytes_xfered += nbytes;
1910         smp_wmb();
1911         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1912 }
1913 
1914 static void atmci_write_data_pio(struct atmel_mci *host)
1915 {
1916         struct scatterlist      *sg = host->sg;
1917         void                    *buf = sg_virt(sg);
1918         unsigned int            offset = host->pio_offset;
1919         struct mmc_data         *data = host->data;
1920         u32                     value;
1921         u32                     status;
1922         unsigned int            nbytes = 0;
1923 
1924         do {
1925                 if (likely(offset + 4 <= sg->length)) {
1926                         value = get_unaligned((u32 *)(buf + offset));
1927                         atmci_writel(host, ATMCI_TDR, value);
1928 
1929                         offset += 4;
1930                         nbytes += 4;
1931                         if (offset == sg->length) {
1932                                 host->sg = sg = sg_next(sg);
1933                                 host->sg_len--;
1934                                 if (!sg || !host->sg_len)
1935                                         goto done;
1936 
1937                                 offset = 0;
1938                                 buf = sg_virt(sg);
1939                         }
1940                 } else {
1941                         unsigned int remaining = sg->length - offset;
1942 
1943                         value = 0;
1944                         memcpy(&value, buf + offset, remaining);
1945                         nbytes += remaining;
1946 
1947                         host->sg = sg = sg_next(sg);
1948                         host->sg_len--;
1949                         if (!sg || !host->sg_len) {
1950                                 atmci_writel(host, ATMCI_TDR, value);
1951                                 goto done;
1952                         }
1953 
1954                         offset = 4 - remaining;
1955                         buf = sg_virt(sg);
1956                         memcpy((u8 *)&value + remaining, buf, offset);
1957                         atmci_writel(host, ATMCI_TDR, value);
1958                         nbytes += offset;
1959                 }
1960 
1961                 status = atmci_readl(host, ATMCI_SR);
1962                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1963                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1964                                                 | ATMCI_DATA_ERROR_FLAGS));
1965                         host->data_status = status;
1966                         data->bytes_xfered += nbytes;
1967                         return;
1968                 }
1969         } while (status & ATMCI_TXRDY);
1970 
1971         host->pio_offset = offset;
1972         data->bytes_xfered += nbytes;
1973 
1974         return;
1975 
1976 done:
1977         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1978         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1979         data->bytes_xfered += nbytes;
1980         smp_wmb();
1981         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1982 }
1983 
1984 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1985 {
1986         int     i;
1987 
1988         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1989                 struct atmel_mci_slot *slot = host->slot[i];
1990                 if (slot && (status & slot->sdio_irq)) {
1991                         mmc_signal_sdio_irq(slot->mmc);
1992                 }
1993         }
1994 }
1995 
1996 
1997 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1998 {
1999         struct atmel_mci        *host = dev_id;
2000         u32                     status, mask, pending;
2001         unsigned int            pass_count = 0;
2002 
2003         do {
2004                 status = atmci_readl(host, ATMCI_SR);
2005                 mask = atmci_readl(host, ATMCI_IMR);
2006                 pending = status & mask;
2007                 if (!pending)
2008                         break;
2009 
2010                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2011                         dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2012                         atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2013                                         | ATMCI_RXRDY | ATMCI_TXRDY
2014                                         | ATMCI_ENDRX | ATMCI_ENDTX
2015                                         | ATMCI_RXBUFF | ATMCI_TXBUFE);
2016 
2017                         host->data_status = status;
2018                         dev_dbg(&host->pdev->dev, "set pending data error\n");
2019                         smp_wmb();
2020                         atmci_set_pending(host, EVENT_DATA_ERROR);
2021                         tasklet_schedule(&host->tasklet);
2022                 }
2023 
2024                 if (pending & ATMCI_TXBUFE) {
2025                         dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2026                         atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2027                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2028                         /*
2029                          * We can receive this interruption before having configured
2030                          * the second pdc buffer, so we need to reconfigure first and
2031                          * second buffers again
2032                          */
2033                         if (host->data_size) {
2034                                 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2035                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2036                                 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2037                         } else {
2038                                 atmci_pdc_complete(host);
2039                         }
2040                 } else if (pending & ATMCI_ENDTX) {
2041                         dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2042                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2043 
2044                         if (host->data_size) {
2045                                 atmci_pdc_set_single_buf(host,
2046                                                 XFER_TRANSMIT, PDC_SECOND_BUF);
2047                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2048                         }
2049                 }
2050 
2051                 if (pending & ATMCI_RXBUFF) {
2052                         dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2053                         atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2054                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2055                         /*
2056                          * We can receive this interruption before having configured
2057                          * the second pdc buffer, so we need to reconfigure first and
2058                          * second buffers again
2059                          */
2060                         if (host->data_size) {
2061                                 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2062                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2063                                 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2064                         } else {
2065                                 atmci_pdc_complete(host);
2066                         }
2067                 } else if (pending & ATMCI_ENDRX) {
2068                         dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2069                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2070 
2071                         if (host->data_size) {
2072                                 atmci_pdc_set_single_buf(host,
2073                                                 XFER_RECEIVE, PDC_SECOND_BUF);
2074                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2075                         }
2076                 }
2077 
2078                 /*
2079                  * First mci IPs, so mainly the ones having pdc, have some
2080                  * issues with the notbusy signal. You can't get it after
2081                  * data transmission if you have not sent a stop command.
2082                  * The appropriate workaround is to use the BLKE signal.
2083                  */
2084                 if (pending & ATMCI_BLKE) {
2085                         dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2086                         atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2087                         smp_wmb();
2088                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2089                         atmci_set_pending(host, EVENT_NOTBUSY);
2090                         tasklet_schedule(&host->tasklet);
2091                 }
2092 
2093                 if (pending & ATMCI_NOTBUSY) {
2094                         dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2095                         atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2096                         smp_wmb();
2097                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2098                         atmci_set_pending(host, EVENT_NOTBUSY);
2099                         tasklet_schedule(&host->tasklet);
2100                 }
2101 
2102                 if (pending & ATMCI_RXRDY)
2103                         atmci_read_data_pio(host);
2104                 if (pending & ATMCI_TXRDY)
2105                         atmci_write_data_pio(host);
2106 
2107                 if (pending & ATMCI_CMDRDY) {
2108                         dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2109                         atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2110                         host->cmd_status = status;
2111                         smp_wmb();
2112                         dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2113                         atmci_set_pending(host, EVENT_CMD_RDY);
2114                         tasklet_schedule(&host->tasklet);
2115                 }
2116 
2117                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2118                         atmci_sdio_interrupt(host, status);
2119 
2120         } while (pass_count++ < 5);
2121 
2122         return pass_count ? IRQ_HANDLED : IRQ_NONE;
2123 }
2124 
2125 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2126 {
2127         struct atmel_mci_slot   *slot = dev_id;
2128 
2129         /*
2130          * Disable interrupts until the pin has stabilized and check
2131          * the state then. Use mod_timer() since we may be in the
2132          * middle of the timer routine when this interrupt triggers.
2133          */
2134         disable_irq_nosync(irq);
2135         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2136 
2137         return IRQ_HANDLED;
2138 }
2139 
2140 static int __init atmci_init_slot(struct atmel_mci *host,
2141                 struct mci_slot_pdata *slot_data, unsigned int id,
2142                 u32 sdc_reg, u32 sdio_irq)
2143 {
2144         struct mmc_host                 *mmc;
2145         struct atmel_mci_slot           *slot;
2146 
2147         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2148         if (!mmc)
2149                 return -ENOMEM;
2150 
2151         slot = mmc_priv(mmc);
2152         slot->mmc = mmc;
2153         slot->host = host;
2154         slot->detect_pin = slot_data->detect_pin;
2155         slot->wp_pin = slot_data->wp_pin;
2156         slot->detect_is_active_high = slot_data->detect_is_active_high;
2157         slot->sdc_reg = sdc_reg;
2158         slot->sdio_irq = sdio_irq;
2159 
2160         dev_dbg(&mmc->class_dev,
2161                 "slot[%u]: bus_width=%u, detect_pin=%d, "
2162                 "detect_is_active_high=%s, wp_pin=%d\n",
2163                 id, slot_data->bus_width, slot_data->detect_pin,
2164                 slot_data->detect_is_active_high ? "true" : "false",
2165                 slot_data->wp_pin);
2166 
2167         mmc->ops = &atmci_ops;
2168         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2169         mmc->f_max = host->bus_hz / 2;
2170         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
2171         if (sdio_irq)
2172                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2173         if (host->caps.has_highspeed)
2174                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2175         /*
2176          * Without the read/write proof capability, it is strongly suggested to
2177          * use only one bit for data to prevent fifo underruns and overruns
2178          * which will corrupt data.
2179          */
2180         if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2181                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2182 
2183         if (atmci_get_version(host) < 0x200) {
2184                 mmc->max_segs = 256;
2185                 mmc->max_blk_size = 4095;
2186                 mmc->max_blk_count = 256;
2187                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2188                 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2189         } else {
2190                 mmc->max_segs = 64;
2191                 mmc->max_req_size = 32768 * 512;
2192                 mmc->max_blk_size = 32768;
2193                 mmc->max_blk_count = 512;
2194         }
2195 
2196         /* Assume card is present initially */
2197         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2198         if (gpio_is_valid(slot->detect_pin)) {
2199                 if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
2200                                       "mmc_detect")) {
2201                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
2202                         slot->detect_pin = -EBUSY;
2203                 } else if (gpio_get_value(slot->detect_pin) ^
2204                                 slot->detect_is_active_high) {
2205                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2206                 }
2207         }
2208 
2209         if (!gpio_is_valid(slot->detect_pin))
2210                 mmc->caps |= MMC_CAP_NEEDS_POLL;
2211 
2212         if (gpio_is_valid(slot->wp_pin)) {
2213                 if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
2214                                       "mmc_wp")) {
2215                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
2216                         slot->wp_pin = -EBUSY;
2217                 }
2218         }
2219 
2220         host->slot[id] = slot;
2221         mmc_regulator_get_supply(mmc);
2222         mmc_add_host(mmc);
2223 
2224         if (gpio_is_valid(slot->detect_pin)) {
2225                 int ret;
2226 
2227                 setup_timer(&slot->detect_timer, atmci_detect_change,
2228                                 (unsigned long)slot);
2229 
2230                 ret = request_irq(gpio_to_irq(slot->detect_pin),
2231                                 atmci_detect_interrupt,
2232                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2233                                 "mmc-detect", slot);
2234                 if (ret) {
2235                         dev_dbg(&mmc->class_dev,
2236                                 "could not request IRQ %d for detect pin\n",
2237                                 gpio_to_irq(slot->detect_pin));
2238                         slot->detect_pin = -EBUSY;
2239                 }
2240         }
2241 
2242         atmci_init_debugfs(slot);
2243 
2244         return 0;
2245 }
2246 
2247 static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
2248                 unsigned int id)
2249 {
2250         /* Debugfs stuff is cleaned up by mmc core */
2251 
2252         set_bit(ATMCI_SHUTDOWN, &slot->flags);
2253         smp_wmb();
2254 
2255         mmc_remove_host(slot->mmc);
2256 
2257         if (gpio_is_valid(slot->detect_pin)) {
2258                 int pin = slot->detect_pin;
2259 
2260                 free_irq(gpio_to_irq(pin), slot);
2261                 del_timer_sync(&slot->detect_timer);
2262         }
2263 
2264         slot->host->slot[id] = NULL;
2265         mmc_free_host(slot->mmc);
2266 }
2267 
2268 static bool atmci_filter(struct dma_chan *chan, void *pdata)
2269 {
2270         struct mci_platform_data *sl_pdata = pdata;
2271         struct mci_dma_data *sl;
2272 
2273         if (!sl_pdata)
2274                 return false;
2275 
2276         sl = sl_pdata->dma_slave;
2277         if (sl && find_slave_dev(sl) == chan->device->dev) {
2278                 chan->private = slave_data_ptr(sl);
2279                 return true;
2280         } else {
2281                 return false;
2282         }
2283 }
2284 
2285 static bool atmci_configure_dma(struct atmel_mci *host)
2286 {
2287         struct mci_platform_data        *pdata;
2288         dma_cap_mask_t mask;
2289 
2290         if (host == NULL)
2291                 return false;
2292 
2293         pdata = host->pdev->dev.platform_data;
2294 
2295         dma_cap_zero(mask);
2296         dma_cap_set(DMA_SLAVE, mask);
2297 
2298         host->dma.chan = dma_request_slave_channel_compat(mask, atmci_filter, pdata,
2299                                                           &host->pdev->dev, "rxtx");
2300         if (!host->dma.chan) {
2301                 dev_warn(&host->pdev->dev, "no DMA channel available\n");
2302                 return false;
2303         } else {
2304                 dev_info(&host->pdev->dev,
2305                                         "using %s for DMA transfers\n",
2306                                         dma_chan_name(host->dma.chan));
2307 
2308                 host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2309                 host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2310                 host->dma_conf.src_maxburst = 1;
2311                 host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2312                 host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2313                 host->dma_conf.dst_maxburst = 1;
2314                 host->dma_conf.device_fc = false;
2315                 return true;
2316         }
2317 }
2318 
2319 /*
2320  * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2321  * HSMCI provides DMA support and a new config register but no more supports
2322  * PDC.
2323  */
2324 static void __init atmci_get_cap(struct atmel_mci *host)
2325 {
2326         unsigned int version;
2327 
2328         version = atmci_get_version(host);
2329         dev_info(&host->pdev->dev,
2330                         "version: 0x%x\n", version);
2331 
2332         host->caps.has_dma_conf_reg = 0;
2333         host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2334         host->caps.has_cfg_reg = 0;
2335         host->caps.has_cstor_reg = 0;
2336         host->caps.has_highspeed = 0;
2337         host->caps.has_rwproof = 0;
2338         host->caps.has_odd_clk_div = 0;
2339         host->caps.has_bad_data_ordering = 1;
2340         host->caps.need_reset_after_xfer = 1;
2341         host->caps.need_blksz_mul_4 = 1;
2342         host->caps.need_notbusy_for_read_ops = 0;
2343 
2344         /* keep only major version number */
2345         switch (version & 0xf00) {
2346         case 0x600:
2347         case 0x500:
2348                 host->caps.has_odd_clk_div = 1;
2349         case 0x400:
2350         case 0x300:
2351                 host->caps.has_dma_conf_reg = 1;
2352                 host->caps.has_pdc = 0;
2353                 host->caps.has_cfg_reg = 1;
2354                 host->caps.has_cstor_reg = 1;
2355                 host->caps.has_highspeed = 1;
2356         case 0x200:
2357                 host->caps.has_rwproof = 1;
2358                 host->caps.need_blksz_mul_4 = 0;
2359                 host->caps.need_notbusy_for_read_ops = 1;
2360         case 0x100:
2361                 host->caps.has_bad_data_ordering = 0;
2362                 host->caps.need_reset_after_xfer = 0;
2363         case 0x0:
2364                 break;
2365         default:
2366                 host->caps.has_pdc = 0;
2367                 dev_warn(&host->pdev->dev,
2368                                 "Unmanaged mci version, set minimum capabilities\n");
2369                 break;
2370         }
2371 }
2372 
2373 static int __init atmci_probe(struct platform_device *pdev)
2374 {
2375         struct mci_platform_data        *pdata;
2376         struct atmel_mci                *host;
2377         struct resource                 *regs;
2378         unsigned int                    nr_slots;
2379         int                             irq;
2380         int                             ret, i;
2381 
2382         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2383         if (!regs)
2384                 return -ENXIO;
2385         pdata = pdev->dev.platform_data;
2386         if (!pdata) {
2387                 pdata = atmci_of_init(pdev);
2388                 if (IS_ERR(pdata)) {
2389                         dev_err(&pdev->dev, "platform data not available\n");
2390                         return PTR_ERR(pdata);
2391                 }
2392         }
2393 
2394         irq = platform_get_irq(pdev, 0);
2395         if (irq < 0)
2396                 return irq;
2397 
2398         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2399         if (!host)
2400                 return -ENOMEM;
2401 
2402         host->pdev = pdev;
2403         spin_lock_init(&host->lock);
2404         INIT_LIST_HEAD(&host->queue);
2405 
2406         host->mck = devm_clk_get(&pdev->dev, "mci_clk");
2407         if (IS_ERR(host->mck))
2408                 return PTR_ERR(host->mck);
2409 
2410         host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2411         if (!host->regs)
2412                 return -ENOMEM;
2413 
2414         ret = clk_prepare_enable(host->mck);
2415         if (ret)
2416                 return ret;
2417 
2418         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2419         host->bus_hz = clk_get_rate(host->mck);
2420         clk_disable_unprepare(host->mck);
2421 
2422         host->mapbase = regs->start;
2423 
2424         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2425 
2426         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2427         if (ret)
2428                 return ret;
2429 
2430         /* Get MCI capabilities and set operations according to it */
2431         atmci_get_cap(host);
2432         if (atmci_configure_dma(host)) {
2433                 host->prepare_data = &atmci_prepare_data_dma;
2434                 host->submit_data = &atmci_submit_data_dma;
2435                 host->stop_transfer = &atmci_stop_transfer_dma;
2436         } else if (host->caps.has_pdc) {
2437                 dev_info(&pdev->dev, "using PDC\n");
2438                 host->prepare_data = &atmci_prepare_data_pdc;
2439                 host->submit_data = &atmci_submit_data_pdc;
2440                 host->stop_transfer = &atmci_stop_transfer_pdc;
2441         } else {
2442                 dev_info(&pdev->dev, "using PIO\n");
2443                 host->prepare_data = &atmci_prepare_data;
2444                 host->submit_data = &atmci_submit_data;
2445                 host->stop_transfer = &atmci_stop_transfer;
2446         }
2447 
2448         platform_set_drvdata(pdev, host);
2449 
2450         setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2451 
2452         /* We need at least one slot to succeed */
2453         nr_slots = 0;
2454         ret = -ENODEV;
2455         if (pdata->slot[0].bus_width) {
2456                 ret = atmci_init_slot(host, &pdata->slot[0],
2457                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2458                 if (!ret) {
2459                         nr_slots++;
2460                         host->buf_size = host->slot[0]->mmc->max_req_size;
2461                 }
2462         }
2463         if (pdata->slot[1].bus_width) {
2464                 ret = atmci_init_slot(host, &pdata->slot[1],
2465                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2466                 if (!ret) {
2467                         nr_slots++;
2468                         if (host->slot[1]->mmc->max_req_size > host->buf_size)
2469                                 host->buf_size =
2470                                         host->slot[1]->mmc->max_req_size;
2471                 }
2472         }
2473 
2474         if (!nr_slots) {
2475                 dev_err(&pdev->dev, "init failed: no slot defined\n");
2476                 goto err_init_slot;
2477         }
2478 
2479         if (!host->caps.has_rwproof) {
2480                 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2481                                                   &host->buf_phys_addr,
2482                                                   GFP_KERNEL);
2483                 if (!host->buffer) {
2484                         ret = -ENOMEM;
2485                         dev_err(&pdev->dev, "buffer allocation failed\n");
2486                         goto err_dma_alloc;
2487                 }
2488         }
2489 
2490         dev_info(&pdev->dev,
2491                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2492                         host->mapbase, irq, nr_slots);
2493 
2494         return 0;
2495 
2496 err_dma_alloc:
2497         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2498                 if (host->slot[i])
2499                         atmci_cleanup_slot(host->slot[i], i);
2500         }
2501 err_init_slot:
2502         del_timer_sync(&host->timer);
2503         if (host->dma.chan)
2504                 dma_release_channel(host->dma.chan);
2505         free_irq(irq, host);
2506         return ret;
2507 }
2508 
2509 static int __exit atmci_remove(struct platform_device *pdev)
2510 {
2511         struct atmel_mci        *host = platform_get_drvdata(pdev);
2512         unsigned int            i;
2513 
2514         if (host->buffer)
2515                 dma_free_coherent(&pdev->dev, host->buf_size,
2516                                   host->buffer, host->buf_phys_addr);
2517 
2518         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2519                 if (host->slot[i])
2520                         atmci_cleanup_slot(host->slot[i], i);
2521         }
2522 
2523         clk_prepare_enable(host->mck);
2524         atmci_writel(host, ATMCI_IDR, ~0UL);
2525         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2526         atmci_readl(host, ATMCI_SR);
2527         clk_disable_unprepare(host->mck);
2528 
2529         del_timer_sync(&host->timer);
2530         if (host->dma.chan)
2531                 dma_release_channel(host->dma.chan);
2532 
2533         free_irq(platform_get_irq(pdev, 0), host);
2534 
2535         return 0;
2536 }
2537 
2538 static struct platform_driver atmci_driver = {
2539         .remove         = __exit_p(atmci_remove),
2540         .driver         = {
2541                 .name           = "atmel_mci",
2542                 .of_match_table = of_match_ptr(atmci_dt_ids),
2543         },
2544 };
2545 
2546 static int __init atmci_init(void)
2547 {
2548         return platform_driver_probe(&atmci_driver, atmci_probe);
2549 }
2550 
2551 static void __exit atmci_exit(void)
2552 {
2553         platform_driver_unregister(&atmci_driver);
2554 }
2555 
2556 late_initcall(atmci_init); /* try to load after dma driver when built-in */
2557 module_exit(atmci_exit);
2558 
2559 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2560 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2561 MODULE_LICENSE("GPL v2");
2562 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us