Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

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/mmc-atmel-mci.h>
 33 
 34 #include <linux/mmc/host.h>
 35 #include <linux/mmc/sdio.h>
 36 
 37 #include <linux/atmel-mci.h>
 38 #include <linux/atmel_pdc.h>
 39 #include <linux/pm.h>
 40 #include <linux/pm_runtime.h>
 41 #include <linux/pinctrl/consumer.h>
 42 
 43 #include <asm/cacheflush.h>
 44 #include <asm/io.h>
 45 #include <asm/unaligned.h>
 46 
 47 #include "atmel-mci-regs.h"
 48 
 49 #define AUTOSUSPEND_DELAY       50
 50 
 51 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
 52 #define ATMCI_DMA_THRESHOLD     16
 53 
 54 enum {
 55         EVENT_CMD_RDY = 0,
 56         EVENT_XFER_COMPLETE,
 57         EVENT_NOTBUSY,
 58         EVENT_DATA_ERROR,
 59 };
 60 
 61 enum atmel_mci_state {
 62         STATE_IDLE = 0,
 63         STATE_SENDING_CMD,
 64         STATE_DATA_XFER,
 65         STATE_WAITING_NOTBUSY,
 66         STATE_SENDING_STOP,
 67         STATE_END_REQUEST,
 68 };
 69 
 70 enum atmci_xfer_dir {
 71         XFER_RECEIVE = 0,
 72         XFER_TRANSMIT,
 73 };
 74 
 75 enum atmci_pdc_buf {
 76         PDC_FIRST_BUF = 0,
 77         PDC_SECOND_BUF,
 78 };
 79 
 80 struct atmel_mci_caps {
 81         bool    has_dma_conf_reg;
 82         bool    has_pdc;
 83         bool    has_cfg_reg;
 84         bool    has_cstor_reg;
 85         bool    has_highspeed;
 86         bool    has_rwproof;
 87         bool    has_odd_clk_div;
 88         bool    has_bad_data_ordering;
 89         bool    need_reset_after_xfer;
 90         bool    need_blksz_mul_4;
 91         bool    need_notbusy_for_read_ops;
 92 };
 93 
 94 struct atmel_mci_dma {
 95         struct dma_chan                 *chan;
 96         struct dma_async_tx_descriptor  *data_desc;
 97 };
 98 
 99 /**
100  * struct atmel_mci - MMC controller state shared between all slots
101  * @lock: Spinlock protecting the queue and associated data.
102  * @regs: Pointer to MMIO registers.
103  * @sg: Scatterlist entry currently being processed by PIO or PDC code.
104  * @pio_offset: Offset into the current scatterlist entry.
105  * @buffer: Buffer used if we don't have the r/w proof capability. We
106  *      don't have the time to switch pdc buffers so we have to use only
107  *      one buffer for the full transaction.
108  * @buf_size: size of the buffer.
109  * @phys_buf_addr: buffer address needed for pdc.
110  * @cur_slot: The slot which is currently using the controller.
111  * @mrq: The request currently being processed on @cur_slot,
112  *      or NULL if the controller is idle.
113  * @cmd: The command currently being sent to the card, or NULL.
114  * @data: The data currently being transferred, or NULL if no data
115  *      transfer is in progress.
116  * @data_size: just data->blocks * data->blksz.
117  * @dma: DMA client state.
118  * @data_chan: DMA channel being used for the current data transfer.
119  * @cmd_status: Snapshot of SR taken upon completion of the current
120  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
121  * @data_status: Snapshot of SR taken upon completion of the current
122  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
123  *      EVENT_DATA_ERROR is pending.
124  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
125  *      to be sent.
126  * @tasklet: Tasklet running the request state machine.
127  * @pending_events: Bitmask of events flagged by the interrupt handler
128  *      to be processed by the tasklet.
129  * @completed_events: Bitmask of events which the state machine has
130  *      processed.
131  * @state: Tasklet state.
132  * @queue: List of slots waiting for access to the controller.
133  * @need_clock_update: Update the clock rate before the next request.
134  * @need_reset: Reset controller before next request.
135  * @timer: Timer to balance the data timeout error flag which cannot rise.
136  * @mode_reg: Value of the MR register.
137  * @cfg_reg: Value of the CFG register.
138  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
139  *      rate and timeout calculations.
140  * @mapbase: Physical address of the MMIO registers.
141  * @mck: The peripheral bus clock hooked up to the MMC controller.
142  * @pdev: Platform device associated with the MMC controller.
143  * @slot: Slots sharing this MMC controller.
144  * @caps: MCI capabilities depending on MCI version.
145  * @prepare_data: function to setup MCI before data transfer which
146  * depends on MCI capabilities.
147  * @submit_data: function to start data transfer which depends on MCI
148  * capabilities.
149  * @stop_transfer: function to stop data transfer which depends on MCI
150  * capabilities.
151  *
152  * Locking
153  * =======
154  *
155  * @lock is a softirq-safe spinlock protecting @queue as well as
156  * @cur_slot, @mrq and @state. These must always be updated
157  * at the same time while holding @lock.
158  *
159  * @lock also protects mode_reg and need_clock_update since these are
160  * used to synchronize mode register updates with the queue
161  * processing.
162  *
163  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
164  * and must always be written at the same time as the slot is added to
165  * @queue.
166  *
167  * @pending_events and @completed_events are accessed using atomic bit
168  * operations, so they don't need any locking.
169  *
170  * None of the fields touched by the interrupt handler need any
171  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
172  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
173  * interrupts must be disabled and @data_status updated with a
174  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
175  * CMDRDY interrupt must be disabled and @cmd_status updated with a
176  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
177  * bytes_xfered field of @data must be written. This is ensured by
178  * using barriers.
179  */
180 struct atmel_mci {
181         spinlock_t              lock;
182         void __iomem            *regs;
183 
184         struct scatterlist      *sg;
185         unsigned int            sg_len;
186         unsigned int            pio_offset;
187         unsigned int            *buffer;
188         unsigned int            buf_size;
189         dma_addr_t              buf_phys_addr;
190 
191         struct atmel_mci_slot   *cur_slot;
192         struct mmc_request      *mrq;
193         struct mmc_command      *cmd;
194         struct mmc_data         *data;
195         unsigned int            data_size;
196 
197         struct atmel_mci_dma    dma;
198         struct dma_chan         *data_chan;
199         struct dma_slave_config dma_conf;
200 
201         u32                     cmd_status;
202         u32                     data_status;
203         u32                     stop_cmdr;
204 
205         struct tasklet_struct   tasklet;
206         unsigned long           pending_events;
207         unsigned long           completed_events;
208         enum atmel_mci_state    state;
209         struct list_head        queue;
210 
211         bool                    need_clock_update;
212         bool                    need_reset;
213         struct timer_list       timer;
214         u32                     mode_reg;
215         u32                     cfg_reg;
216         unsigned long           bus_hz;
217         unsigned long           mapbase;
218         struct clk              *mck;
219         struct platform_device  *pdev;
220 
221         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
222 
223         struct atmel_mci_caps   caps;
224 
225         u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
226         void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
227         void (*stop_transfer)(struct atmel_mci *host);
228 };
229 
230 /**
231  * struct atmel_mci_slot - MMC slot state
232  * @mmc: The mmc_host representing this slot.
233  * @host: The MMC controller this slot is using.
234  * @sdc_reg: Value of SDCR to be written before using this slot.
235  * @sdio_irq: SDIO irq mask for this slot.
236  * @mrq: mmc_request currently being processed or waiting to be
237  *      processed, or NULL when the slot is idle.
238  * @queue_node: List node for placing this node in the @queue list of
239  *      &struct atmel_mci.
240  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
241  * @flags: Random state bits associated with the slot.
242  * @detect_pin: GPIO pin used for card detection, or negative if not
243  *      available.
244  * @wp_pin: GPIO pin used for card write protect sending, or negative
245  *      if not available.
246  * @detect_is_active_high: The state of the detect pin when it is active.
247  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
248  */
249 struct atmel_mci_slot {
250         struct mmc_host         *mmc;
251         struct atmel_mci        *host;
252 
253         u32                     sdc_reg;
254         u32                     sdio_irq;
255 
256         struct mmc_request      *mrq;
257         struct list_head        queue_node;
258 
259         unsigned int            clock;
260         unsigned long           flags;
261 #define ATMCI_CARD_PRESENT      0
262 #define ATMCI_CARD_NEED_INIT    1
263 #define ATMCI_SHUTDOWN          2
264 
265         int                     detect_pin;
266         int                     wp_pin;
267         bool                    detect_is_active_high;
268 
269         struct timer_list       detect_timer;
270 };
271 
272 #define atmci_test_and_clear_pending(host, event)               \
273         test_and_clear_bit(event, &host->pending_events)
274 #define atmci_set_completed(host, event)                        \
275         set_bit(event, &host->completed_events)
276 #define atmci_set_pending(host, event)                          \
277         set_bit(event, &host->pending_events)
278 
279 /*
280  * The debugfs stuff below is mostly optimized away when
281  * CONFIG_DEBUG_FS is not set.
282  */
283 static int atmci_req_show(struct seq_file *s, void *v)
284 {
285         struct atmel_mci_slot   *slot = s->private;
286         struct mmc_request      *mrq;
287         struct mmc_command      *cmd;
288         struct mmc_command      *stop;
289         struct mmc_data         *data;
290 
291         /* Make sure we get a consistent snapshot */
292         spin_lock_bh(&slot->host->lock);
293         mrq = slot->mrq;
294 
295         if (mrq) {
296                 cmd = mrq->cmd;
297                 data = mrq->data;
298                 stop = mrq->stop;
299 
300                 if (cmd)
301                         seq_printf(s,
302                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
303                                 cmd->opcode, cmd->arg, cmd->flags,
304                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
305                                 cmd->resp[3], cmd->error);
306                 if (data)
307                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
308                                 data->bytes_xfered, data->blocks,
309                                 data->blksz, data->flags, data->error);
310                 if (stop)
311                         seq_printf(s,
312                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
313                                 stop->opcode, stop->arg, stop->flags,
314                                 stop->resp[0], stop->resp[1], stop->resp[2],
315                                 stop->resp[3], stop->error);
316         }
317 
318         spin_unlock_bh(&slot->host->lock);
319 
320         return 0;
321 }
322 
323 static int atmci_req_open(struct inode *inode, struct file *file)
324 {
325         return single_open(file, atmci_req_show, inode->i_private);
326 }
327 
328 static const struct file_operations atmci_req_fops = {
329         .owner          = THIS_MODULE,
330         .open           = atmci_req_open,
331         .read           = seq_read,
332         .llseek         = seq_lseek,
333         .release        = single_release,
334 };
335 
336 static void atmci_show_status_reg(struct seq_file *s,
337                 const char *regname, u32 value)
338 {
339         static const char       *sr_bit[] = {
340                 [0]     = "CMDRDY",
341                 [1]     = "RXRDY",
342                 [2]     = "TXRDY",
343                 [3]     = "BLKE",
344                 [4]     = "DTIP",
345                 [5]     = "NOTBUSY",
346                 [6]     = "ENDRX",
347                 [7]     = "ENDTX",
348                 [8]     = "SDIOIRQA",
349                 [9]     = "SDIOIRQB",
350                 [12]    = "SDIOWAIT",
351                 [14]    = "RXBUFF",
352                 [15]    = "TXBUFE",
353                 [16]    = "RINDE",
354                 [17]    = "RDIRE",
355                 [18]    = "RCRCE",
356                 [19]    = "RENDE",
357                 [20]    = "RTOE",
358                 [21]    = "DCRCE",
359                 [22]    = "DTOE",
360                 [23]    = "CSTOE",
361                 [24]    = "BLKOVRE",
362                 [25]    = "DMADONE",
363                 [26]    = "FIFOEMPTY",
364                 [27]    = "XFRDONE",
365                 [30]    = "OVRE",
366                 [31]    = "UNRE",
367         };
368         unsigned int            i;
369 
370         seq_printf(s, "%s:\t0x%08x", regname, value);
371         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
372                 if (value & (1 << i)) {
373                         if (sr_bit[i])
374                                 seq_printf(s, " %s", sr_bit[i]);
375                         else
376                                 seq_puts(s, " UNKNOWN");
377                 }
378         }
379         seq_putc(s, '\n');
380 }
381 
382 static int atmci_regs_show(struct seq_file *s, void *v)
383 {
384         struct atmel_mci        *host = s->private;
385         u32                     *buf;
386         int                     ret = 0;
387 
388 
389         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
390         if (!buf)
391                 return -ENOMEM;
392 
393         pm_runtime_get_sync(&host->pdev->dev);
394 
395         /*
396          * Grab a more or less consistent snapshot. Note that we're
397          * not disabling interrupts, so IMR and SR may not be
398          * consistent.
399          */
400         spin_lock_bh(&host->lock);
401         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
402         spin_unlock_bh(&host->lock);
403 
404         pm_runtime_mark_last_busy(&host->pdev->dev);
405         pm_runtime_put_autosuspend(&host->pdev->dev);
406 
407         seq_printf(s, "MR:\t0x%08x%s%s ",
408                         buf[ATMCI_MR / 4],
409                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
410                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
411         if (host->caps.has_odd_clk_div)
412                 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
413                                 ((buf[ATMCI_MR / 4] & 0xff) << 1)
414                                 | ((buf[ATMCI_MR / 4] >> 16) & 1));
415         else
416                 seq_printf(s, "CLKDIV=%u\n",
417                                 (buf[ATMCI_MR / 4] & 0xff));
418         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
419         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
420         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
421         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
422                         buf[ATMCI_BLKR / 4],
423                         buf[ATMCI_BLKR / 4] & 0xffff,
424                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
425         if (host->caps.has_cstor_reg)
426                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
427 
428         /* Don't read RSPR and RDR; it will consume the data there */
429 
430         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
431         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
432 
433         if (host->caps.has_dma_conf_reg) {
434                 u32 val;
435 
436                 val = buf[ATMCI_DMA / 4];
437                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
438                                 val, val & 3,
439                                 ((val >> 4) & 3) ?
440                                         1 << (((val >> 4) & 3) + 1) : 1,
441                                 val & ATMCI_DMAEN ? " DMAEN" : "");
442         }
443         if (host->caps.has_cfg_reg) {
444                 u32 val;
445 
446                 val = buf[ATMCI_CFG / 4];
447                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
448                                 val,
449                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
450                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
451                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
452                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
453         }
454 
455         kfree(buf);
456 
457         return ret;
458 }
459 
460 static int atmci_regs_open(struct inode *inode, struct file *file)
461 {
462         return single_open(file, atmci_regs_show, inode->i_private);
463 }
464 
465 static const struct file_operations atmci_regs_fops = {
466         .owner          = THIS_MODULE,
467         .open           = atmci_regs_open,
468         .read           = seq_read,
469         .llseek         = seq_lseek,
470         .release        = single_release,
471 };
472 
473 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
474 {
475         struct mmc_host         *mmc = slot->mmc;
476         struct atmel_mci        *host = slot->host;
477         struct dentry           *root;
478         struct dentry           *node;
479 
480         root = mmc->debugfs_root;
481         if (!root)
482                 return;
483 
484         node = debugfs_create_file("regs", S_IRUSR, root, host,
485                         &atmci_regs_fops);
486         if (IS_ERR(node))
487                 return;
488         if (!node)
489                 goto err;
490 
491         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
492         if (!node)
493                 goto err;
494 
495         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
496         if (!node)
497                 goto err;
498 
499         node = debugfs_create_x32("pending_events", S_IRUSR, root,
500                                      (u32 *)&host->pending_events);
501         if (!node)
502                 goto err;
503 
504         node = debugfs_create_x32("completed_events", S_IRUSR, root,
505                                      (u32 *)&host->completed_events);
506         if (!node)
507                 goto err;
508 
509         return;
510 
511 err:
512         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
513 }
514 
515 #if defined(CONFIG_OF)
516 static const struct of_device_id atmci_dt_ids[] = {
517         { .compatible = "atmel,hsmci" },
518         { /* sentinel */ }
519 };
520 
521 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
522 
523 static struct mci_platform_data*
524 atmci_of_init(struct platform_device *pdev)
525 {
526         struct device_node *np = pdev->dev.of_node;
527         struct device_node *cnp;
528         struct mci_platform_data *pdata;
529         u32 slot_id;
530 
531         if (!np) {
532                 dev_err(&pdev->dev, "device node not found\n");
533                 return ERR_PTR(-EINVAL);
534         }
535 
536         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
537         if (!pdata) {
538                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
539                 return ERR_PTR(-ENOMEM);
540         }
541 
542         for_each_child_of_node(np, cnp) {
543                 if (of_property_read_u32(cnp, "reg", &slot_id)) {
544                         dev_warn(&pdev->dev, "reg property is missing for %s\n",
545                                  cnp->full_name);
546                         continue;
547                 }
548 
549                 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
550                         dev_warn(&pdev->dev, "can't have more than %d slots\n",
551                                  ATMCI_MAX_NR_SLOTS);
552                         break;
553                 }
554 
555                 if (of_property_read_u32(cnp, "bus-width",
556                                          &pdata->slot[slot_id].bus_width))
557                         pdata->slot[slot_id].bus_width = 1;
558 
559                 pdata->slot[slot_id].detect_pin =
560                         of_get_named_gpio(cnp, "cd-gpios", 0);
561 
562                 pdata->slot[slot_id].detect_is_active_high =
563                         of_property_read_bool(cnp, "cd-inverted");
564 
565                 pdata->slot[slot_id].non_removable =
566                         of_property_read_bool(cnp, "non-removable");
567 
568                 pdata->slot[slot_id].wp_pin =
569                         of_get_named_gpio(cnp, "wp-gpios", 0);
570         }
571 
572         return pdata;
573 }
574 #else /* CONFIG_OF */
575 static inline struct mci_platform_data*
576 atmci_of_init(struct platform_device *dev)
577 {
578         return ERR_PTR(-EINVAL);
579 }
580 #endif
581 
582 static inline unsigned int atmci_get_version(struct atmel_mci *host)
583 {
584         return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
585 }
586 
587 static void atmci_timeout_timer(unsigned long data)
588 {
589         struct atmel_mci *host;
590 
591         host = (struct atmel_mci *)data;
592 
593         dev_dbg(&host->pdev->dev, "software timeout\n");
594 
595         if (host->mrq->cmd->data) {
596                 host->mrq->cmd->data->error = -ETIMEDOUT;
597                 host->data = NULL;
598                 /*
599                  * With some SDIO modules, sometimes DMA transfer hangs. If
600                  * stop_transfer() is not called then the DMA request is not
601                  * removed, following ones are queued and never computed.
602                  */
603                 if (host->state == STATE_DATA_XFER)
604                         host->stop_transfer(host);
605         } else {
606                 host->mrq->cmd->error = -ETIMEDOUT;
607                 host->cmd = NULL;
608         }
609         host->need_reset = 1;
610         host->state = STATE_END_REQUEST;
611         smp_wmb();
612         tasklet_schedule(&host->tasklet);
613 }
614 
615 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
616                                         unsigned int ns)
617 {
618         /*
619          * It is easier here to use us instead of ns for the timeout,
620          * it prevents from overflows during calculation.
621          */
622         unsigned int us = DIV_ROUND_UP(ns, 1000);
623 
624         /* Maximum clock frequency is host->bus_hz/2 */
625         return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
626 }
627 
628 static void atmci_set_timeout(struct atmel_mci *host,
629                 struct atmel_mci_slot *slot, struct mmc_data *data)
630 {
631         static unsigned dtomul_to_shift[] = {
632                 0, 4, 7, 8, 10, 12, 16, 20
633         };
634         unsigned        timeout;
635         unsigned        dtocyc;
636         unsigned        dtomul;
637 
638         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
639                 + data->timeout_clks;
640 
641         for (dtomul = 0; dtomul < 8; dtomul++) {
642                 unsigned shift = dtomul_to_shift[dtomul];
643                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
644                 if (dtocyc < 15)
645                         break;
646         }
647 
648         if (dtomul >= 8) {
649                 dtomul = 7;
650                 dtocyc = 15;
651         }
652 
653         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
654                         dtocyc << dtomul_to_shift[dtomul]);
655         atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
656 }
657 
658 /*
659  * Return mask with command flags to be enabled for this command.
660  */
661 static u32 atmci_prepare_command(struct mmc_host *mmc,
662                                  struct mmc_command *cmd)
663 {
664         struct mmc_data *data;
665         u32             cmdr;
666 
667         cmd->error = -EINPROGRESS;
668 
669         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
670 
671         if (cmd->flags & MMC_RSP_PRESENT) {
672                 if (cmd->flags & MMC_RSP_136)
673                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
674                 else
675                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
676         }
677 
678         /*
679          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
680          * it's too difficult to determine whether this is an ACMD or
681          * not. Better make it 64.
682          */
683         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
684 
685         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
686                 cmdr |= ATMCI_CMDR_OPDCMD;
687 
688         data = cmd->data;
689         if (data) {
690                 cmdr |= ATMCI_CMDR_START_XFER;
691 
692                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
693                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
694                 } else {
695                         if (data->flags & MMC_DATA_STREAM)
696                                 cmdr |= ATMCI_CMDR_STREAM;
697                         else if (data->blocks > 1)
698                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
699                         else
700                                 cmdr |= ATMCI_CMDR_BLOCK;
701                 }
702 
703                 if (data->flags & MMC_DATA_READ)
704                         cmdr |= ATMCI_CMDR_TRDIR_READ;
705         }
706 
707         return cmdr;
708 }
709 
710 static void atmci_send_command(struct atmel_mci *host,
711                 struct mmc_command *cmd, u32 cmd_flags)
712 {
713         WARN_ON(host->cmd);
714         host->cmd = cmd;
715 
716         dev_vdbg(&host->pdev->dev,
717                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
718                         cmd->arg, cmd_flags);
719 
720         atmci_writel(host, ATMCI_ARGR, cmd->arg);
721         atmci_writel(host, ATMCI_CMDR, cmd_flags);
722 }
723 
724 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
725 {
726         dev_dbg(&host->pdev->dev, "send stop command\n");
727         atmci_send_command(host, data->stop, host->stop_cmdr);
728         atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
729 }
730 
731 /*
732  * Configure given PDC buffer taking care of alignement issues.
733  * Update host->data_size and host->sg.
734  */
735 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
736         enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
737 {
738         u32 pointer_reg, counter_reg;
739         unsigned int buf_size;
740 
741         if (dir == XFER_RECEIVE) {
742                 pointer_reg = ATMEL_PDC_RPR;
743                 counter_reg = ATMEL_PDC_RCR;
744         } else {
745                 pointer_reg = ATMEL_PDC_TPR;
746                 counter_reg = ATMEL_PDC_TCR;
747         }
748 
749         if (buf_nb == PDC_SECOND_BUF) {
750                 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
751                 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
752         }
753 
754         if (!host->caps.has_rwproof) {
755                 buf_size = host->buf_size;
756                 atmci_writel(host, pointer_reg, host->buf_phys_addr);
757         } else {
758                 buf_size = sg_dma_len(host->sg);
759                 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
760         }
761 
762         if (host->data_size <= buf_size) {
763                 if (host->data_size & 0x3) {
764                         /* If size is different from modulo 4, transfer bytes */
765                         atmci_writel(host, counter_reg, host->data_size);
766                         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
767                 } else {
768                         /* Else transfer 32-bits words */
769                         atmci_writel(host, counter_reg, host->data_size / 4);
770                 }
771                 host->data_size = 0;
772         } else {
773                 /* We assume the size of a page is 32-bits aligned */
774                 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
775                 host->data_size -= sg_dma_len(host->sg);
776                 if (host->data_size)
777                         host->sg = sg_next(host->sg);
778         }
779 }
780 
781 /*
782  * Configure PDC buffer according to the data size ie configuring one or two
783  * buffers. Don't use this function if you want to configure only the second
784  * buffer. In this case, use atmci_pdc_set_single_buf.
785  */
786 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
787 {
788         atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
789         if (host->data_size)
790                 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
791 }
792 
793 /*
794  * Unmap sg lists, called when transfer is finished.
795  */
796 static void atmci_pdc_cleanup(struct atmel_mci *host)
797 {
798         struct mmc_data         *data = host->data;
799 
800         if (data)
801                 dma_unmap_sg(&host->pdev->dev,
802                                 data->sg, data->sg_len,
803                                 ((data->flags & MMC_DATA_WRITE)
804                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
805 }
806 
807 /*
808  * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
809  * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
810  * interrupt needed for both transfer directions.
811  */
812 static void atmci_pdc_complete(struct atmel_mci *host)
813 {
814         int transfer_size = host->data->blocks * host->data->blksz;
815         int i;
816 
817         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
818 
819         if ((!host->caps.has_rwproof)
820             && (host->data->flags & MMC_DATA_READ)) {
821                 if (host->caps.has_bad_data_ordering)
822                         for (i = 0; i < transfer_size; i++)
823                                 host->buffer[i] = swab32(host->buffer[i]);
824                 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
825                                     host->buffer, transfer_size);
826         }
827 
828         atmci_pdc_cleanup(host);
829 
830         dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
831         atmci_set_pending(host, EVENT_XFER_COMPLETE);
832         tasklet_schedule(&host->tasklet);
833 }
834 
835 static void atmci_dma_cleanup(struct atmel_mci *host)
836 {
837         struct mmc_data                 *data = host->data;
838 
839         if (data)
840                 dma_unmap_sg(host->dma.chan->device->dev,
841                                 data->sg, data->sg_len,
842                                 ((data->flags & MMC_DATA_WRITE)
843                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
844 }
845 
846 /*
847  * This function is called by the DMA driver from tasklet context.
848  */
849 static void atmci_dma_complete(void *arg)
850 {
851         struct atmel_mci        *host = arg;
852         struct mmc_data         *data = host->data;
853 
854         dev_vdbg(&host->pdev->dev, "DMA complete\n");
855 
856         if (host->caps.has_dma_conf_reg)
857                 /* Disable DMA hardware handshaking on MCI */
858                 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
859 
860         atmci_dma_cleanup(host);
861 
862         /*
863          * If the card was removed, data will be NULL. No point trying
864          * to send the stop command or waiting for NBUSY in this case.
865          */
866         if (data) {
867                 dev_dbg(&host->pdev->dev,
868                         "(%s) set pending xfer complete\n", __func__);
869                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
870                 tasklet_schedule(&host->tasklet);
871 
872                 /*
873                  * Regardless of what the documentation says, we have
874                  * to wait for NOTBUSY even after block read
875                  * operations.
876                  *
877                  * When the DMA transfer is complete, the controller
878                  * may still be reading the CRC from the card, i.e.
879                  * the data transfer is still in progress and we
880                  * haven't seen all the potential error bits yet.
881                  *
882                  * The interrupt handler will schedule a different
883                  * tasklet to finish things up when the data transfer
884                  * is completely done.
885                  *
886                  * We may not complete the mmc request here anyway
887                  * because the mmc layer may call back and cause us to
888                  * violate the "don't submit new operations from the
889                  * completion callback" rule of the dma engine
890                  * framework.
891                  */
892                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
893         }
894 }
895 
896 /*
897  * Returns a mask of interrupt flags to be enabled after the whole
898  * request has been prepared.
899  */
900 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
901 {
902         u32 iflags;
903 
904         data->error = -EINPROGRESS;
905 
906         host->sg = data->sg;
907         host->sg_len = data->sg_len;
908         host->data = data;
909         host->data_chan = NULL;
910 
911         iflags = ATMCI_DATA_ERROR_FLAGS;
912 
913         /*
914          * Errata: MMC data write operation with less than 12
915          * bytes is impossible.
916          *
917          * Errata: MCI Transmit Data Register (TDR) FIFO
918          * corruption when length is not multiple of 4.
919          */
920         if (data->blocks * data->blksz < 12
921                         || (data->blocks * data->blksz) & 3)
922                 host->need_reset = true;
923 
924         host->pio_offset = 0;
925         if (data->flags & MMC_DATA_READ)
926                 iflags |= ATMCI_RXRDY;
927         else
928                 iflags |= ATMCI_TXRDY;
929 
930         return iflags;
931 }
932 
933 /*
934  * Set interrupt flags and set block length into the MCI mode register even
935  * if this value is also accessible in the MCI block register. It seems to be
936  * necessary before the High Speed MCI version. It also map sg and configure
937  * PDC registers.
938  */
939 static u32
940 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
941 {
942         u32 iflags, tmp;
943         unsigned int sg_len;
944         enum dma_data_direction dir;
945         int i;
946 
947         data->error = -EINPROGRESS;
948 
949         host->data = data;
950         host->sg = data->sg;
951         iflags = ATMCI_DATA_ERROR_FLAGS;
952 
953         /* Enable pdc mode */
954         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
955 
956         if (data->flags & MMC_DATA_READ) {
957                 dir = DMA_FROM_DEVICE;
958                 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
959         } else {
960                 dir = DMA_TO_DEVICE;
961                 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
962         }
963 
964         /* Set BLKLEN */
965         tmp = atmci_readl(host, ATMCI_MR);
966         tmp &= 0x0000ffff;
967         tmp |= ATMCI_BLKLEN(data->blksz);
968         atmci_writel(host, ATMCI_MR, tmp);
969 
970         /* Configure PDC */
971         host->data_size = data->blocks * data->blksz;
972         sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
973 
974         if ((!host->caps.has_rwproof)
975             && (host->data->flags & MMC_DATA_WRITE)) {
976                 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
977                                   host->buffer, host->data_size);
978                 if (host->caps.has_bad_data_ordering)
979                         for (i = 0; i < host->data_size; i++)
980                                 host->buffer[i] = swab32(host->buffer[i]);
981         }
982 
983         if (host->data_size)
984                 atmci_pdc_set_both_buf(host,
985                         ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
986 
987         return iflags;
988 }
989 
990 static u32
991 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
992 {
993         struct dma_chan                 *chan;
994         struct dma_async_tx_descriptor  *desc;
995         struct scatterlist              *sg;
996         unsigned int                    i;
997         enum dma_data_direction         direction;
998         enum dma_transfer_direction     slave_dirn;
999         unsigned int                    sglen;
1000         u32                             maxburst;
1001         u32 iflags;
1002 
1003         data->error = -EINPROGRESS;
1004 
1005         WARN_ON(host->data);
1006         host->sg = NULL;
1007         host->data = data;
1008 
1009         iflags = ATMCI_DATA_ERROR_FLAGS;
1010 
1011         /*
1012          * We don't do DMA on "complex" transfers, i.e. with
1013          * non-word-aligned buffers or lengths. Also, we don't bother
1014          * with all the DMA setup overhead for short transfers.
1015          */
1016         if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1017                 return atmci_prepare_data(host, data);
1018         if (data->blksz & 3)
1019                 return atmci_prepare_data(host, data);
1020 
1021         for_each_sg(data->sg, sg, data->sg_len, i) {
1022                 if (sg->offset & 3 || sg->length & 3)
1023                         return atmci_prepare_data(host, data);
1024         }
1025 
1026         /* If we don't have a channel, we can't do DMA */
1027         chan = host->dma.chan;
1028         if (chan)
1029                 host->data_chan = chan;
1030 
1031         if (!chan)
1032                 return -ENODEV;
1033 
1034         if (data->flags & MMC_DATA_READ) {
1035                 direction = DMA_FROM_DEVICE;
1036                 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1037                 maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
1038         } else {
1039                 direction = DMA_TO_DEVICE;
1040                 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1041                 maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
1042         }
1043 
1044         if (host->caps.has_dma_conf_reg)
1045                 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1046                         ATMCI_DMAEN);
1047 
1048         sglen = dma_map_sg(chan->device->dev, data->sg,
1049                         data->sg_len, direction);
1050 
1051         dmaengine_slave_config(chan, &host->dma_conf);
1052         desc = dmaengine_prep_slave_sg(chan,
1053                         data->sg, sglen, slave_dirn,
1054                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1055         if (!desc)
1056                 goto unmap_exit;
1057 
1058         host->dma.data_desc = desc;
1059         desc->callback = atmci_dma_complete;
1060         desc->callback_param = host;
1061 
1062         return iflags;
1063 unmap_exit:
1064         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1065         return -ENOMEM;
1066 }
1067 
1068 static void
1069 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1070 {
1071         return;
1072 }
1073 
1074 /*
1075  * Start PDC according to transfer direction.
1076  */
1077 static void
1078 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1079 {
1080         if (data->flags & MMC_DATA_READ)
1081                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1082         else
1083                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1084 }
1085 
1086 static void
1087 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1088 {
1089         struct dma_chan                 *chan = host->data_chan;
1090         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
1091 
1092         if (chan) {
1093                 dmaengine_submit(desc);
1094                 dma_async_issue_pending(chan);
1095         }
1096 }
1097 
1098 static void atmci_stop_transfer(struct atmel_mci *host)
1099 {
1100         dev_dbg(&host->pdev->dev,
1101                 "(%s) set pending xfer complete\n", __func__);
1102         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1103         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1104 }
1105 
1106 /*
1107  * Stop data transfer because error(s) occurred.
1108  */
1109 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1110 {
1111         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1112 }
1113 
1114 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1115 {
1116         struct dma_chan *chan = host->data_chan;
1117 
1118         if (chan) {
1119                 dmaengine_terminate_all(chan);
1120                 atmci_dma_cleanup(host);
1121         } else {
1122                 /* Data transfer was stopped by the interrupt handler */
1123                 dev_dbg(&host->pdev->dev,
1124                         "(%s) set pending xfer complete\n", __func__);
1125                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1126                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1127         }
1128 }
1129 
1130 /*
1131  * Start a request: prepare data if needed, prepare the command and activate
1132  * interrupts.
1133  */
1134 static void atmci_start_request(struct atmel_mci *host,
1135                 struct atmel_mci_slot *slot)
1136 {
1137         struct mmc_request      *mrq;
1138         struct mmc_command      *cmd;
1139         struct mmc_data         *data;
1140         u32                     iflags;
1141         u32                     cmdflags;
1142 
1143         mrq = slot->mrq;
1144         host->cur_slot = slot;
1145         host->mrq = mrq;
1146 
1147         host->pending_events = 0;
1148         host->completed_events = 0;
1149         host->cmd_status = 0;
1150         host->data_status = 0;
1151 
1152         dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1153 
1154         if (host->need_reset || host->caps.need_reset_after_xfer) {
1155                 iflags = atmci_readl(host, ATMCI_IMR);
1156                 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1157                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1158                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1159                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1160                 if (host->caps.has_cfg_reg)
1161                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1162                 atmci_writel(host, ATMCI_IER, iflags);
1163                 host->need_reset = false;
1164         }
1165         atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1166 
1167         iflags = atmci_readl(host, ATMCI_IMR);
1168         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1169                 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1170                                 iflags);
1171 
1172         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1173                 /* Send init sequence (74 clock cycles) */
1174                 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1175                 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1176                         cpu_relax();
1177         }
1178         iflags = 0;
1179         data = mrq->data;
1180         if (data) {
1181                 atmci_set_timeout(host, slot, data);
1182 
1183                 /* Must set block count/size before sending command */
1184                 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1185                                 | ATMCI_BLKLEN(data->blksz));
1186                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1187                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1188 
1189                 iflags |= host->prepare_data(host, data);
1190         }
1191 
1192         iflags |= ATMCI_CMDRDY;
1193         cmd = mrq->cmd;
1194         cmdflags = atmci_prepare_command(slot->mmc, cmd);
1195 
1196         /*
1197          * DMA transfer should be started before sending the command to avoid
1198          * unexpected errors especially for read operations in SDIO mode.
1199          * Unfortunately, in PDC mode, command has to be sent before starting
1200          * the transfer.
1201          */
1202         if (host->submit_data != &atmci_submit_data_dma)
1203                 atmci_send_command(host, cmd, cmdflags);
1204 
1205         if (data)
1206                 host->submit_data(host, data);
1207 
1208         if (host->submit_data == &atmci_submit_data_dma)
1209                 atmci_send_command(host, cmd, cmdflags);
1210 
1211         if (mrq->stop) {
1212                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1213                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1214                 if (!(data->flags & MMC_DATA_WRITE))
1215                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1216                 if (data->flags & MMC_DATA_STREAM)
1217                         host->stop_cmdr |= ATMCI_CMDR_STREAM;
1218                 else
1219                         host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1220         }
1221 
1222         /*
1223          * We could have enabled interrupts earlier, but I suspect
1224          * that would open up a nice can of interesting race
1225          * conditions (e.g. command and data complete, but stop not
1226          * prepared yet.)
1227          */
1228         atmci_writel(host, ATMCI_IER, iflags);
1229 
1230         mod_timer(&host->timer, jiffies +  msecs_to_jiffies(2000));
1231 }
1232 
1233 static void atmci_queue_request(struct atmel_mci *host,
1234                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1235 {
1236         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1237                         host->state);
1238 
1239         spin_lock_bh(&host->lock);
1240         slot->mrq = mrq;
1241         if (host->state == STATE_IDLE) {
1242                 host->state = STATE_SENDING_CMD;
1243                 atmci_start_request(host, slot);
1244         } else {
1245                 dev_dbg(&host->pdev->dev, "queue request\n");
1246                 list_add_tail(&slot->queue_node, &host->queue);
1247         }
1248         spin_unlock_bh(&host->lock);
1249 }
1250 
1251 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1252 {
1253         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1254         struct atmel_mci        *host = slot->host;
1255         struct mmc_data         *data;
1256 
1257         WARN_ON(slot->mrq);
1258         dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1259 
1260         pm_runtime_get_sync(&host->pdev->dev);
1261 
1262         /*
1263          * We may "know" the card is gone even though there's still an
1264          * electrical connection. If so, we really need to communicate
1265          * this to the MMC core since there won't be any more
1266          * interrupts as the card is completely removed. Otherwise,
1267          * the MMC core might believe the card is still there even
1268          * though the card was just removed very slowly.
1269          */
1270         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1271                 mrq->cmd->error = -ENOMEDIUM;
1272                 mmc_request_done(mmc, mrq);
1273                 return;
1274         }
1275 
1276         /* We don't support multiple blocks of weird lengths. */
1277         data = mrq->data;
1278         if (data && data->blocks > 1 && data->blksz & 3) {
1279                 mrq->cmd->error = -EINVAL;
1280                 mmc_request_done(mmc, mrq);
1281         }
1282 
1283         atmci_queue_request(host, slot, mrq);
1284 }
1285 
1286 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1287 {
1288         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1289         struct atmel_mci        *host = slot->host;
1290         unsigned int            i;
1291 
1292         pm_runtime_get_sync(&host->pdev->dev);
1293 
1294         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1295         switch (ios->bus_width) {
1296         case MMC_BUS_WIDTH_1:
1297                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1298                 break;
1299         case MMC_BUS_WIDTH_4:
1300                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1301                 break;
1302         }
1303 
1304         if (ios->clock) {
1305                 unsigned int clock_min = ~0U;
1306                 int clkdiv;
1307 
1308                 spin_lock_bh(&host->lock);
1309                 if (!host->mode_reg) {
1310                         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1311                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1312                         if (host->caps.has_cfg_reg)
1313                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1314                 }
1315 
1316                 /*
1317                  * Use mirror of ios->clock to prevent race with mmc
1318                  * core ios update when finding the minimum.
1319                  */
1320                 slot->clock = ios->clock;
1321                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1322                         if (host->slot[i] && host->slot[i]->clock
1323                                         && host->slot[i]->clock < clock_min)
1324                                 clock_min = host->slot[i]->clock;
1325                 }
1326 
1327                 /* Calculate clock divider */
1328                 if (host->caps.has_odd_clk_div) {
1329                         clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1330                         if (clkdiv < 0) {
1331                                 dev_warn(&mmc->class_dev,
1332                                          "clock %u too fast; using %lu\n",
1333                                          clock_min, host->bus_hz / 2);
1334                                 clkdiv = 0;
1335                         } else if (clkdiv > 511) {
1336                                 dev_warn(&mmc->class_dev,
1337                                          "clock %u too slow; using %lu\n",
1338                                          clock_min, host->bus_hz / (511 + 2));
1339                                 clkdiv = 511;
1340                         }
1341                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1342                                          | ATMCI_MR_CLKODD(clkdiv & 1);
1343                 } else {
1344                         clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1345                         if (clkdiv > 255) {
1346                                 dev_warn(&mmc->class_dev,
1347                                          "clock %u too slow; using %lu\n",
1348                                          clock_min, host->bus_hz / (2 * 256));
1349                                 clkdiv = 255;
1350                         }
1351                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1352                 }
1353 
1354                 /*
1355                  * WRPROOF and RDPROOF prevent overruns/underruns by
1356                  * stopping the clock when the FIFO is full/empty.
1357                  * This state is not expected to last for long.
1358                  */
1359                 if (host->caps.has_rwproof)
1360                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1361 
1362                 if (host->caps.has_cfg_reg) {
1363                         /* setup High Speed mode in relation with card capacity */
1364                         if (ios->timing == MMC_TIMING_SD_HS)
1365                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
1366                         else
1367                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1368                 }
1369 
1370                 if (list_empty(&host->queue)) {
1371                         atmci_writel(host, ATMCI_MR, host->mode_reg);
1372                         if (host->caps.has_cfg_reg)
1373                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1374                 } else {
1375                         host->need_clock_update = true;
1376                 }
1377 
1378                 spin_unlock_bh(&host->lock);
1379         } else {
1380                 bool any_slot_active = false;
1381 
1382                 spin_lock_bh(&host->lock);
1383                 slot->clock = 0;
1384                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1385                         if (host->slot[i] && host->slot[i]->clock) {
1386                                 any_slot_active = true;
1387                                 break;
1388                         }
1389                 }
1390                 if (!any_slot_active) {
1391                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1392                         if (host->mode_reg) {
1393                                 atmci_readl(host, ATMCI_MR);
1394                         }
1395                         host->mode_reg = 0;
1396                 }
1397                 spin_unlock_bh(&host->lock);
1398         }
1399 
1400         switch (ios->power_mode) {
1401         case MMC_POWER_OFF:
1402                 if (!IS_ERR(mmc->supply.vmmc))
1403                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1404                 break;
1405         case MMC_POWER_UP:
1406                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1407                 if (!IS_ERR(mmc->supply.vmmc))
1408                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1409                 break;
1410         default:
1411                 /*
1412                  * TODO: None of the currently available AVR32-based
1413                  * boards allow MMC power to be turned off. Implement
1414                  * power control when this can be tested properly.
1415                  *
1416                  * We also need to hook this into the clock management
1417                  * somehow so that newly inserted cards aren't
1418                  * subjected to a fast clock before we have a chance
1419                  * to figure out what the maximum rate is. Currently,
1420                  * there's no way to avoid this, and there never will
1421                  * be for boards that don't support power control.
1422                  */
1423                 break;
1424         }
1425 
1426         pm_runtime_mark_last_busy(&host->pdev->dev);
1427         pm_runtime_put_autosuspend(&host->pdev->dev);
1428 }
1429 
1430 static int atmci_get_ro(struct mmc_host *mmc)
1431 {
1432         int                     read_only = -ENOSYS;
1433         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1434 
1435         if (gpio_is_valid(slot->wp_pin)) {
1436                 read_only = gpio_get_value(slot->wp_pin);
1437                 dev_dbg(&mmc->class_dev, "card is %s\n",
1438                                 read_only ? "read-only" : "read-write");
1439         }
1440 
1441         return read_only;
1442 }
1443 
1444 static int atmci_get_cd(struct mmc_host *mmc)
1445 {
1446         int                     present = -ENOSYS;
1447         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1448 
1449         if (gpio_is_valid(slot->detect_pin)) {
1450                 present = !(gpio_get_value(slot->detect_pin) ^
1451                             slot->detect_is_active_high);
1452                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1453                                 present ? "" : "not ");
1454         }
1455 
1456         return present;
1457 }
1458 
1459 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1460 {
1461         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1462         struct atmel_mci        *host = slot->host;
1463 
1464         if (enable)
1465                 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1466         else
1467                 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1468 }
1469 
1470 static const struct mmc_host_ops atmci_ops = {
1471         .request        = atmci_request,
1472         .set_ios        = atmci_set_ios,
1473         .get_ro         = atmci_get_ro,
1474         .get_cd         = atmci_get_cd,
1475         .enable_sdio_irq = atmci_enable_sdio_irq,
1476 };
1477 
1478 /* Called with host->lock held */
1479 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1480         __releases(&host->lock)
1481         __acquires(&host->lock)
1482 {
1483         struct atmel_mci_slot   *slot = NULL;
1484         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1485 
1486         WARN_ON(host->cmd || host->data);
1487 
1488         /*
1489          * Update the MMC clock rate if necessary. This may be
1490          * necessary if set_ios() is called when a different slot is
1491          * busy transferring data.
1492          */
1493         if (host->need_clock_update) {
1494                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1495                 if (host->caps.has_cfg_reg)
1496                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1497         }
1498 
1499         host->cur_slot->mrq = NULL;
1500         host->mrq = NULL;
1501         if (!list_empty(&host->queue)) {
1502                 slot = list_entry(host->queue.next,
1503                                 struct atmel_mci_slot, queue_node);
1504                 list_del(&slot->queue_node);
1505                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1506                                 mmc_hostname(slot->mmc));
1507                 host->state = STATE_SENDING_CMD;
1508                 atmci_start_request(host, slot);
1509         } else {
1510                 dev_vdbg(&host->pdev->dev, "list empty\n");
1511                 host->state = STATE_IDLE;
1512         }
1513 
1514         del_timer(&host->timer);
1515 
1516         spin_unlock(&host->lock);
1517         mmc_request_done(prev_mmc, mrq);
1518         spin_lock(&host->lock);
1519 
1520         pm_runtime_mark_last_busy(&host->pdev->dev);
1521         pm_runtime_put_autosuspend(&host->pdev->dev);
1522 }
1523 
1524 static void atmci_command_complete(struct atmel_mci *host,
1525                         struct mmc_command *cmd)
1526 {
1527         u32             status = host->cmd_status;
1528 
1529         /* Read the response from the card (up to 16 bytes) */
1530         cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1531         cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1532         cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1533         cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1534 
1535         if (status & ATMCI_RTOE)
1536                 cmd->error = -ETIMEDOUT;
1537         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1538                 cmd->error = -EILSEQ;
1539         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1540                 cmd->error = -EIO;
1541         else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1542                 if (host->caps.need_blksz_mul_4) {
1543                         cmd->error = -EINVAL;
1544                         host->need_reset = 1;
1545                 }
1546         } else
1547                 cmd->error = 0;
1548 }
1549 
1550 static void atmci_detect_change(unsigned long data)
1551 {
1552         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
1553         bool                    present;
1554         bool                    present_old;
1555 
1556         /*
1557          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1558          * freeing the interrupt. We must not re-enable the interrupt
1559          * if it has been freed, and if we're shutting down, it
1560          * doesn't really matter whether the card is present or not.
1561          */
1562         smp_rmb();
1563         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1564                 return;
1565 
1566         enable_irq(gpio_to_irq(slot->detect_pin));
1567         present = !(gpio_get_value(slot->detect_pin) ^
1568                     slot->detect_is_active_high);
1569         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1570 
1571         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1572                         present, present_old);
1573 
1574         if (present != present_old) {
1575                 struct atmel_mci        *host = slot->host;
1576                 struct mmc_request      *mrq;
1577 
1578                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1579                         present ? "inserted" : "removed");
1580 
1581                 spin_lock(&host->lock);
1582 
1583                 if (!present)
1584                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1585                 else
1586                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1587 
1588                 /* Clean up queue if present */
1589                 mrq = slot->mrq;
1590                 if (mrq) {
1591                         if (mrq == host->mrq) {
1592                                 /*
1593                                  * Reset controller to terminate any ongoing
1594                                  * commands or data transfers.
1595                                  */
1596                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1597                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1598                                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1599                                 if (host->caps.has_cfg_reg)
1600                                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1601 
1602                                 host->data = NULL;
1603                                 host->cmd = NULL;
1604 
1605                                 switch (host->state) {
1606                                 case STATE_IDLE:
1607                                         break;
1608                                 case STATE_SENDING_CMD:
1609                                         mrq->cmd->error = -ENOMEDIUM;
1610                                         if (mrq->data)
1611                                                 host->stop_transfer(host);
1612                                         break;
1613                                 case STATE_DATA_XFER:
1614                                         mrq->data->error = -ENOMEDIUM;
1615                                         host->stop_transfer(host);
1616                                         break;
1617                                 case STATE_WAITING_NOTBUSY:
1618                                         mrq->data->error = -ENOMEDIUM;
1619                                         break;
1620                                 case STATE_SENDING_STOP:
1621                                         mrq->stop->error = -ENOMEDIUM;
1622                                         break;
1623                                 case STATE_END_REQUEST:
1624                                         break;
1625                                 }
1626 
1627                                 atmci_request_end(host, mrq);
1628                         } else {
1629                                 list_del(&slot->queue_node);
1630                                 mrq->cmd->error = -ENOMEDIUM;
1631                                 if (mrq->data)
1632                                         mrq->data->error = -ENOMEDIUM;
1633                                 if (mrq->stop)
1634                                         mrq->stop->error = -ENOMEDIUM;
1635 
1636                                 spin_unlock(&host->lock);
1637                                 mmc_request_done(slot->mmc, mrq);
1638                                 spin_lock(&host->lock);
1639                         }
1640                 }
1641                 spin_unlock(&host->lock);
1642 
1643                 mmc_detect_change(slot->mmc, 0);
1644         }
1645 }
1646 
1647 static void atmci_tasklet_func(unsigned long priv)
1648 {
1649         struct atmel_mci        *host = (struct atmel_mci *)priv;
1650         struct mmc_request      *mrq = host->mrq;
1651         struct mmc_data         *data = host->data;
1652         enum atmel_mci_state    state = host->state;
1653         enum atmel_mci_state    prev_state;
1654         u32                     status;
1655 
1656         spin_lock(&host->lock);
1657 
1658         state = host->state;
1659 
1660         dev_vdbg(&host->pdev->dev,
1661                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1662                 state, host->pending_events, host->completed_events,
1663                 atmci_readl(host, ATMCI_IMR));
1664 
1665         do {
1666                 prev_state = state;
1667                 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1668 
1669                 switch (state) {
1670                 case STATE_IDLE:
1671                         break;
1672 
1673                 case STATE_SENDING_CMD:
1674                         /*
1675                          * Command has been sent, we are waiting for command
1676                          * ready. Then we have three next states possible:
1677                          * END_REQUEST by default, WAITING_NOTBUSY if it's a
1678                          * command needing it or DATA_XFER if there is data.
1679                          */
1680                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1681                         if (!atmci_test_and_clear_pending(host,
1682                                                 EVENT_CMD_RDY))
1683                                 break;
1684 
1685                         dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1686                         host->cmd = NULL;
1687                         atmci_set_completed(host, EVENT_CMD_RDY);
1688                         atmci_command_complete(host, mrq->cmd);
1689                         if (mrq->data) {
1690                                 dev_dbg(&host->pdev->dev,
1691                                         "command with data transfer");
1692                                 /*
1693                                  * If there is a command error don't start
1694                                  * data transfer.
1695                                  */
1696                                 if (mrq->cmd->error) {
1697                                         host->stop_transfer(host);
1698                                         host->data = NULL;
1699                                         atmci_writel(host, ATMCI_IDR,
1700                                                      ATMCI_TXRDY | ATMCI_RXRDY
1701                                                      | ATMCI_DATA_ERROR_FLAGS);
1702                                         state = STATE_END_REQUEST;
1703                                 } else
1704                                         state = STATE_DATA_XFER;
1705                         } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1706                                 dev_dbg(&host->pdev->dev,
1707                                         "command response need waiting notbusy");
1708                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1709                                 state = STATE_WAITING_NOTBUSY;
1710                         } else
1711                                 state = STATE_END_REQUEST;
1712 
1713                         break;
1714 
1715                 case STATE_DATA_XFER:
1716                         if (atmci_test_and_clear_pending(host,
1717                                                 EVENT_DATA_ERROR)) {
1718                                 dev_dbg(&host->pdev->dev, "set completed data error\n");
1719                                 atmci_set_completed(host, EVENT_DATA_ERROR);
1720                                 state = STATE_END_REQUEST;
1721                                 break;
1722                         }
1723 
1724                         /*
1725                          * A data transfer is in progress. The event expected
1726                          * to move to the next state depends of data transfer
1727                          * type (PDC or DMA). Once transfer done we can move
1728                          * to the next step which is WAITING_NOTBUSY in write
1729                          * case and directly SENDING_STOP in read case.
1730                          */
1731                         dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1732                         if (!atmci_test_and_clear_pending(host,
1733                                                 EVENT_XFER_COMPLETE))
1734                                 break;
1735 
1736                         dev_dbg(&host->pdev->dev,
1737                                 "(%s) set completed xfer complete\n",
1738                                 __func__);
1739                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1740 
1741                         if (host->caps.need_notbusy_for_read_ops ||
1742                            (host->data->flags & MMC_DATA_WRITE)) {
1743                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1744                                 state = STATE_WAITING_NOTBUSY;
1745                         } else if (host->mrq->stop) {
1746                                 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1747                                 atmci_send_stop_cmd(host, data);
1748                                 state = STATE_SENDING_STOP;
1749                         } else {
1750                                 host->data = NULL;
1751                                 data->bytes_xfered = data->blocks * data->blksz;
1752                                 data->error = 0;
1753                                 state = STATE_END_REQUEST;
1754                         }
1755                         break;
1756 
1757                 case STATE_WAITING_NOTBUSY:
1758                         /*
1759                          * We can be in the state for two reasons: a command
1760                          * requiring waiting not busy signal (stop command
1761                          * included) or a write operation. In the latest case,
1762                          * we need to send a stop command.
1763                          */
1764                         dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1765                         if (!atmci_test_and_clear_pending(host,
1766                                                 EVENT_NOTBUSY))
1767                                 break;
1768 
1769                         dev_dbg(&host->pdev->dev, "set completed not busy\n");
1770                         atmci_set_completed(host, EVENT_NOTBUSY);
1771 
1772                         if (host->data) {
1773                                 /*
1774                                  * For some commands such as CMD53, even if
1775                                  * there is data transfer, there is no stop
1776                                  * command to send.
1777                                  */
1778                                 if (host->mrq->stop) {
1779                                         atmci_writel(host, ATMCI_IER,
1780                                                      ATMCI_CMDRDY);
1781                                         atmci_send_stop_cmd(host, data);
1782                                         state = STATE_SENDING_STOP;
1783                                 } else {
1784                                         host->data = NULL;
1785                                         data->bytes_xfered = data->blocks
1786                                                              * data->blksz;
1787                                         data->error = 0;
1788                                         state = STATE_END_REQUEST;
1789                                 }
1790                         } else
1791                                 state = STATE_END_REQUEST;
1792                         break;
1793 
1794                 case STATE_SENDING_STOP:
1795                         /*
1796                          * In this state, it is important to set host->data to
1797                          * NULL (which is tested in the waiting notbusy state)
1798                          * in order to go to the end request state instead of
1799                          * sending stop again.
1800                          */
1801                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1802                         if (!atmci_test_and_clear_pending(host,
1803                                                 EVENT_CMD_RDY))
1804                                 break;
1805 
1806                         dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1807                         host->cmd = NULL;
1808                         data->bytes_xfered = data->blocks * data->blksz;
1809                         data->error = 0;
1810                         atmci_command_complete(host, mrq->stop);
1811                         if (mrq->stop->error) {
1812                                 host->stop_transfer(host);
1813                                 atmci_writel(host, ATMCI_IDR,
1814                                              ATMCI_TXRDY | ATMCI_RXRDY
1815                                              | ATMCI_DATA_ERROR_FLAGS);
1816                                 state = STATE_END_REQUEST;
1817                         } else {
1818                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1819                                 state = STATE_WAITING_NOTBUSY;
1820                         }
1821                         host->data = NULL;
1822                         break;
1823 
1824                 case STATE_END_REQUEST:
1825                         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1826                                            | ATMCI_DATA_ERROR_FLAGS);
1827                         status = host->data_status;
1828                         if (unlikely(status)) {
1829                                 host->stop_transfer(host);
1830                                 host->data = NULL;
1831                                 if (data) {
1832                                         if (status & ATMCI_DTOE) {
1833                                                 data->error = -ETIMEDOUT;
1834                                         } else if (status & ATMCI_DCRCE) {
1835                                                 data->error = -EILSEQ;
1836                                         } else {
1837                                                 data->error = -EIO;
1838                                         }
1839                                 }
1840                         }
1841 
1842                         atmci_request_end(host, host->mrq);
1843                         state = STATE_IDLE;
1844                         break;
1845                 }
1846         } while (state != prev_state);
1847 
1848         host->state = state;
1849 
1850         spin_unlock(&host->lock);
1851 }
1852 
1853 static void atmci_read_data_pio(struct atmel_mci *host)
1854 {
1855         struct scatterlist      *sg = host->sg;
1856         void                    *buf = sg_virt(sg);
1857         unsigned int            offset = host->pio_offset;
1858         struct mmc_data         *data = host->data;
1859         u32                     value;
1860         u32                     status;
1861         unsigned int            nbytes = 0;
1862 
1863         do {
1864                 value = atmci_readl(host, ATMCI_RDR);
1865                 if (likely(offset + 4 <= sg->length)) {
1866                         put_unaligned(value, (u32 *)(buf + offset));
1867 
1868                         offset += 4;
1869                         nbytes += 4;
1870 
1871                         if (offset == sg->length) {
1872                                 flush_dcache_page(sg_page(sg));
1873                                 host->sg = sg = sg_next(sg);
1874                                 host->sg_len--;
1875                                 if (!sg || !host->sg_len)
1876                                         goto done;
1877 
1878                                 offset = 0;
1879                                 buf = sg_virt(sg);
1880                         }
1881                 } else {
1882                         unsigned int remaining = sg->length - offset;
1883                         memcpy(buf + offset, &value, remaining);
1884                         nbytes += remaining;
1885 
1886                         flush_dcache_page(sg_page(sg));
1887                         host->sg = sg = sg_next(sg);
1888                         host->sg_len--;
1889                         if (!sg || !host->sg_len)
1890                                 goto done;
1891 
1892                         offset = 4 - remaining;
1893                         buf = sg_virt(sg);
1894                         memcpy(buf, (u8 *)&value + remaining, offset);
1895                         nbytes += offset;
1896                 }
1897 
1898                 status = atmci_readl(host, ATMCI_SR);
1899                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1900                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1901                                                 | ATMCI_DATA_ERROR_FLAGS));
1902                         host->data_status = status;
1903                         data->bytes_xfered += nbytes;
1904                         return;
1905                 }
1906         } while (status & ATMCI_RXRDY);
1907 
1908         host->pio_offset = offset;
1909         data->bytes_xfered += nbytes;
1910 
1911         return;
1912 
1913 done:
1914         atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1915         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1916         data->bytes_xfered += nbytes;
1917         smp_wmb();
1918         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1919 }
1920 
1921 static void atmci_write_data_pio(struct atmel_mci *host)
1922 {
1923         struct scatterlist      *sg = host->sg;
1924         void                    *buf = sg_virt(sg);
1925         unsigned int            offset = host->pio_offset;
1926         struct mmc_data         *data = host->data;
1927         u32                     value;
1928         u32                     status;
1929         unsigned int            nbytes = 0;
1930 
1931         do {
1932                 if (likely(offset + 4 <= sg->length)) {
1933                         value = get_unaligned((u32 *)(buf + offset));
1934                         atmci_writel(host, ATMCI_TDR, value);
1935 
1936                         offset += 4;
1937                         nbytes += 4;
1938                         if (offset == sg->length) {
1939                                 host->sg = sg = sg_next(sg);
1940                                 host->sg_len--;
1941                                 if (!sg || !host->sg_len)
1942                                         goto done;
1943 
1944                                 offset = 0;
1945                                 buf = sg_virt(sg);
1946                         }
1947                 } else {
1948                         unsigned int remaining = sg->length - offset;
1949 
1950                         value = 0;
1951                         memcpy(&value, buf + offset, remaining);
1952                         nbytes += remaining;
1953 
1954                         host->sg = sg = sg_next(sg);
1955                         host->sg_len--;
1956                         if (!sg || !host->sg_len) {
1957                                 atmci_writel(host, ATMCI_TDR, value);
1958                                 goto done;
1959                         }
1960 
1961                         offset = 4 - remaining;
1962                         buf = sg_virt(sg);
1963                         memcpy((u8 *)&value + remaining, buf, offset);
1964                         atmci_writel(host, ATMCI_TDR, value);
1965                         nbytes += offset;
1966                 }
1967 
1968                 status = atmci_readl(host, ATMCI_SR);
1969                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1970                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1971                                                 | ATMCI_DATA_ERROR_FLAGS));
1972                         host->data_status = status;
1973                         data->bytes_xfered += nbytes;
1974                         return;
1975                 }
1976         } while (status & ATMCI_TXRDY);
1977 
1978         host->pio_offset = offset;
1979         data->bytes_xfered += nbytes;
1980 
1981         return;
1982 
1983 done:
1984         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1985         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1986         data->bytes_xfered += nbytes;
1987         smp_wmb();
1988         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1989 }
1990 
1991 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1992 {
1993         int     i;
1994 
1995         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1996                 struct atmel_mci_slot *slot = host->slot[i];
1997                 if (slot && (status & slot->sdio_irq)) {
1998                         mmc_signal_sdio_irq(slot->mmc);
1999                 }
2000         }
2001 }
2002 
2003 
2004 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
2005 {
2006         struct atmel_mci        *host = dev_id;
2007         u32                     status, mask, pending;
2008         unsigned int            pass_count = 0;
2009 
2010         do {
2011                 status = atmci_readl(host, ATMCI_SR);
2012                 mask = atmci_readl(host, ATMCI_IMR);
2013                 pending = status & mask;
2014                 if (!pending)
2015                         break;
2016 
2017                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2018                         dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2019                         atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2020                                         | ATMCI_RXRDY | ATMCI_TXRDY
2021                                         | ATMCI_ENDRX | ATMCI_ENDTX
2022                                         | ATMCI_RXBUFF | ATMCI_TXBUFE);
2023 
2024                         host->data_status = status;
2025                         dev_dbg(&host->pdev->dev, "set pending data error\n");
2026                         smp_wmb();
2027                         atmci_set_pending(host, EVENT_DATA_ERROR);
2028                         tasklet_schedule(&host->tasklet);
2029                 }
2030 
2031                 if (pending & ATMCI_TXBUFE) {
2032                         dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2033                         atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2034                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2035                         /*
2036                          * We can receive this interruption before having configured
2037                          * the second pdc buffer, so we need to reconfigure first and
2038                          * second buffers again
2039                          */
2040                         if (host->data_size) {
2041                                 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2042                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2043                                 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2044                         } else {
2045                                 atmci_pdc_complete(host);
2046                         }
2047                 } else if (pending & ATMCI_ENDTX) {
2048                         dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2049                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2050 
2051                         if (host->data_size) {
2052                                 atmci_pdc_set_single_buf(host,
2053                                                 XFER_TRANSMIT, PDC_SECOND_BUF);
2054                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2055                         }
2056                 }
2057 
2058                 if (pending & ATMCI_RXBUFF) {
2059                         dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2060                         atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2061                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2062                         /*
2063                          * We can receive this interruption before having configured
2064                          * the second pdc buffer, so we need to reconfigure first and
2065                          * second buffers again
2066                          */
2067                         if (host->data_size) {
2068                                 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2069                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2070                                 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2071                         } else {
2072                                 atmci_pdc_complete(host);
2073                         }
2074                 } else if (pending & ATMCI_ENDRX) {
2075                         dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2076                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2077 
2078                         if (host->data_size) {
2079                                 atmci_pdc_set_single_buf(host,
2080                                                 XFER_RECEIVE, PDC_SECOND_BUF);
2081                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2082                         }
2083                 }
2084 
2085                 /*
2086                  * First mci IPs, so mainly the ones having pdc, have some
2087                  * issues with the notbusy signal. You can't get it after
2088                  * data transmission if you have not sent a stop command.
2089                  * The appropriate workaround is to use the BLKE signal.
2090                  */
2091                 if (pending & ATMCI_BLKE) {
2092                         dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2093                         atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2094                         smp_wmb();
2095                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2096                         atmci_set_pending(host, EVENT_NOTBUSY);
2097                         tasklet_schedule(&host->tasklet);
2098                 }
2099 
2100                 if (pending & ATMCI_NOTBUSY) {
2101                         dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2102                         atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2103                         smp_wmb();
2104                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2105                         atmci_set_pending(host, EVENT_NOTBUSY);
2106                         tasklet_schedule(&host->tasklet);
2107                 }
2108 
2109                 if (pending & ATMCI_RXRDY)
2110                         atmci_read_data_pio(host);
2111                 if (pending & ATMCI_TXRDY)
2112                         atmci_write_data_pio(host);
2113 
2114                 if (pending & ATMCI_CMDRDY) {
2115                         dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2116                         atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2117                         host->cmd_status = status;
2118                         smp_wmb();
2119                         dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2120                         atmci_set_pending(host, EVENT_CMD_RDY);
2121                         tasklet_schedule(&host->tasklet);
2122                 }
2123 
2124                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2125                         atmci_sdio_interrupt(host, status);
2126 
2127         } while (pass_count++ < 5);
2128 
2129         return pass_count ? IRQ_HANDLED : IRQ_NONE;
2130 }
2131 
2132 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2133 {
2134         struct atmel_mci_slot   *slot = dev_id;
2135 
2136         /*
2137          * Disable interrupts until the pin has stabilized and check
2138          * the state then. Use mod_timer() since we may be in the
2139          * middle of the timer routine when this interrupt triggers.
2140          */
2141         disable_irq_nosync(irq);
2142         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2143 
2144         return IRQ_HANDLED;
2145 }
2146 
2147 static int atmci_init_slot(struct atmel_mci *host,
2148                 struct mci_slot_pdata *slot_data, unsigned int id,
2149                 u32 sdc_reg, u32 sdio_irq)
2150 {
2151         struct mmc_host                 *mmc;
2152         struct atmel_mci_slot           *slot;
2153 
2154         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2155         if (!mmc)
2156                 return -ENOMEM;
2157 
2158         slot = mmc_priv(mmc);
2159         slot->mmc = mmc;
2160         slot->host = host;
2161         slot->detect_pin = slot_data->detect_pin;
2162         slot->wp_pin = slot_data->wp_pin;
2163         slot->detect_is_active_high = slot_data->detect_is_active_high;
2164         slot->sdc_reg = sdc_reg;
2165         slot->sdio_irq = sdio_irq;
2166 
2167         dev_dbg(&mmc->class_dev,
2168                 "slot[%u]: bus_width=%u, detect_pin=%d, "
2169                 "detect_is_active_high=%s, wp_pin=%d\n",
2170                 id, slot_data->bus_width, slot_data->detect_pin,
2171                 slot_data->detect_is_active_high ? "true" : "false",
2172                 slot_data->wp_pin);
2173 
2174         mmc->ops = &atmci_ops;
2175         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2176         mmc->f_max = host->bus_hz / 2;
2177         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
2178         if (sdio_irq)
2179                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2180         if (host->caps.has_highspeed)
2181                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2182         /*
2183          * Without the read/write proof capability, it is strongly suggested to
2184          * use only one bit for data to prevent fifo underruns and overruns
2185          * which will corrupt data.
2186          */
2187         if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2188                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2189 
2190         if (atmci_get_version(host) < 0x200) {
2191                 mmc->max_segs = 256;
2192                 mmc->max_blk_size = 4095;
2193                 mmc->max_blk_count = 256;
2194                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2195                 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2196         } else {
2197                 mmc->max_segs = 64;
2198                 mmc->max_req_size = 32768 * 512;
2199                 mmc->max_blk_size = 32768;
2200                 mmc->max_blk_count = 512;
2201         }
2202 
2203         /* Assume card is present initially */
2204         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2205         if (gpio_is_valid(slot->detect_pin)) {
2206                 if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
2207                                       "mmc_detect")) {
2208                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
2209                         slot->detect_pin = -EBUSY;
2210                 } else if (gpio_get_value(slot->detect_pin) ^
2211                                 slot->detect_is_active_high) {
2212                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2213                 }
2214         }
2215 
2216         if (!gpio_is_valid(slot->detect_pin)) {
2217                 if (slot_data->non_removable)
2218                         mmc->caps |= MMC_CAP_NONREMOVABLE;
2219                 else
2220                         mmc->caps |= MMC_CAP_NEEDS_POLL;
2221         }
2222 
2223         if (gpio_is_valid(slot->wp_pin)) {
2224                 if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
2225                                       "mmc_wp")) {
2226                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
2227                         slot->wp_pin = -EBUSY;
2228                 }
2229         }
2230 
2231         host->slot[id] = slot;
2232         mmc_regulator_get_supply(mmc);
2233         mmc_add_host(mmc);
2234 
2235         if (gpio_is_valid(slot->detect_pin)) {
2236                 int ret;
2237 
2238                 setup_timer(&slot->detect_timer, atmci_detect_change,
2239                                 (unsigned long)slot);
2240 
2241                 ret = request_irq(gpio_to_irq(slot->detect_pin),
2242                                 atmci_detect_interrupt,
2243                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2244                                 "mmc-detect", slot);
2245                 if (ret) {
2246                         dev_dbg(&mmc->class_dev,
2247                                 "could not request IRQ %d for detect pin\n",
2248                                 gpio_to_irq(slot->detect_pin));
2249                         slot->detect_pin = -EBUSY;
2250                 }
2251         }
2252 
2253         atmci_init_debugfs(slot);
2254 
2255         return 0;
2256 }
2257 
2258 static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
2259                 unsigned int id)
2260 {
2261         /* Debugfs stuff is cleaned up by mmc core */
2262 
2263         set_bit(ATMCI_SHUTDOWN, &slot->flags);
2264         smp_wmb();
2265 
2266         mmc_remove_host(slot->mmc);
2267 
2268         if (gpio_is_valid(slot->detect_pin)) {
2269                 int pin = slot->detect_pin;
2270 
2271                 free_irq(gpio_to_irq(pin), slot);
2272                 del_timer_sync(&slot->detect_timer);
2273         }
2274 
2275         slot->host->slot[id] = NULL;
2276         mmc_free_host(slot->mmc);
2277 }
2278 
2279 static int atmci_configure_dma(struct atmel_mci *host)
2280 {
2281         host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev,
2282                                                         "rxtx");
2283         if (IS_ERR(host->dma.chan))
2284                 return PTR_ERR(host->dma.chan);
2285 
2286         dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
2287                  dma_chan_name(host->dma.chan));
2288 
2289         host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2290         host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2291         host->dma_conf.src_maxburst = 1;
2292         host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2293         host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2294         host->dma_conf.dst_maxburst = 1;
2295         host->dma_conf.device_fc = false;
2296 
2297         return 0;
2298 }
2299 
2300 /*
2301  * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2302  * HSMCI provides DMA support and a new config register but no more supports
2303  * PDC.
2304  */
2305 static void atmci_get_cap(struct atmel_mci *host)
2306 {
2307         unsigned int version;
2308 
2309         version = atmci_get_version(host);
2310         dev_info(&host->pdev->dev,
2311                         "version: 0x%x\n", version);
2312 
2313         host->caps.has_dma_conf_reg = 0;
2314         host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2315         host->caps.has_cfg_reg = 0;
2316         host->caps.has_cstor_reg = 0;
2317         host->caps.has_highspeed = 0;
2318         host->caps.has_rwproof = 0;
2319         host->caps.has_odd_clk_div = 0;
2320         host->caps.has_bad_data_ordering = 1;
2321         host->caps.need_reset_after_xfer = 1;
2322         host->caps.need_blksz_mul_4 = 1;
2323         host->caps.need_notbusy_for_read_ops = 0;
2324 
2325         /* keep only major version number */
2326         switch (version & 0xf00) {
2327         case 0x600:
2328         case 0x500:
2329                 host->caps.has_odd_clk_div = 1;
2330         case 0x400:
2331         case 0x300:
2332                 host->caps.has_dma_conf_reg = 1;
2333                 host->caps.has_pdc = 0;
2334                 host->caps.has_cfg_reg = 1;
2335                 host->caps.has_cstor_reg = 1;
2336                 host->caps.has_highspeed = 1;
2337         case 0x200:
2338                 host->caps.has_rwproof = 1;
2339                 host->caps.need_blksz_mul_4 = 0;
2340                 host->caps.need_notbusy_for_read_ops = 1;
2341         case 0x100:
2342                 host->caps.has_bad_data_ordering = 0;
2343                 host->caps.need_reset_after_xfer = 0;
2344         case 0x0:
2345                 break;
2346         default:
2347                 host->caps.has_pdc = 0;
2348                 dev_warn(&host->pdev->dev,
2349                                 "Unmanaged mci version, set minimum capabilities\n");
2350                 break;
2351         }
2352 }
2353 
2354 static int atmci_probe(struct platform_device *pdev)
2355 {
2356         struct mci_platform_data        *pdata;
2357         struct atmel_mci                *host;
2358         struct resource                 *regs;
2359         unsigned int                    nr_slots;
2360         int                             irq;
2361         int                             ret, i;
2362 
2363         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2364         if (!regs)
2365                 return -ENXIO;
2366         pdata = pdev->dev.platform_data;
2367         if (!pdata) {
2368                 pdata = atmci_of_init(pdev);
2369                 if (IS_ERR(pdata)) {
2370                         dev_err(&pdev->dev, "platform data not available\n");
2371                         return PTR_ERR(pdata);
2372                 }
2373         }
2374 
2375         irq = platform_get_irq(pdev, 0);
2376         if (irq < 0)
2377                 return irq;
2378 
2379         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2380         if (!host)
2381                 return -ENOMEM;
2382 
2383         host->pdev = pdev;
2384         spin_lock_init(&host->lock);
2385         INIT_LIST_HEAD(&host->queue);
2386 
2387         host->mck = devm_clk_get(&pdev->dev, "mci_clk");
2388         if (IS_ERR(host->mck))
2389                 return PTR_ERR(host->mck);
2390 
2391         host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2392         if (!host->regs)
2393                 return -ENOMEM;
2394 
2395         ret = clk_prepare_enable(host->mck);
2396         if (ret)
2397                 return ret;
2398 
2399         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2400         host->bus_hz = clk_get_rate(host->mck);
2401 
2402         host->mapbase = regs->start;
2403 
2404         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2405 
2406         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2407         if (ret) {
2408                 clk_disable_unprepare(host->mck);
2409                 return ret;
2410         }
2411 
2412         /* Get MCI capabilities and set operations according to it */
2413         atmci_get_cap(host);
2414         ret = atmci_configure_dma(host);
2415         if (ret == -EPROBE_DEFER)
2416                 goto err_dma_probe_defer;
2417         if (ret == 0) {
2418                 host->prepare_data = &atmci_prepare_data_dma;
2419                 host->submit_data = &atmci_submit_data_dma;
2420                 host->stop_transfer = &atmci_stop_transfer_dma;
2421         } else if (host->caps.has_pdc) {
2422                 dev_info(&pdev->dev, "using PDC\n");
2423                 host->prepare_data = &atmci_prepare_data_pdc;
2424                 host->submit_data = &atmci_submit_data_pdc;
2425                 host->stop_transfer = &atmci_stop_transfer_pdc;
2426         } else {
2427                 dev_info(&pdev->dev, "using PIO\n");
2428                 host->prepare_data = &atmci_prepare_data;
2429                 host->submit_data = &atmci_submit_data;
2430                 host->stop_transfer = &atmci_stop_transfer;
2431         }
2432 
2433         platform_set_drvdata(pdev, host);
2434 
2435         setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2436 
2437         pm_runtime_get_noresume(&pdev->dev);
2438         pm_runtime_set_active(&pdev->dev);
2439         pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_DELAY);
2440         pm_runtime_use_autosuspend(&pdev->dev);
2441         pm_runtime_enable(&pdev->dev);
2442 
2443         /* We need at least one slot to succeed */
2444         nr_slots = 0;
2445         ret = -ENODEV;
2446         if (pdata->slot[0].bus_width) {
2447                 ret = atmci_init_slot(host, &pdata->slot[0],
2448                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2449                 if (!ret) {
2450                         nr_slots++;
2451                         host->buf_size = host->slot[0]->mmc->max_req_size;
2452                 }
2453         }
2454         if (pdata->slot[1].bus_width) {
2455                 ret = atmci_init_slot(host, &pdata->slot[1],
2456                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2457                 if (!ret) {
2458                         nr_slots++;
2459                         if (host->slot[1]->mmc->max_req_size > host->buf_size)
2460                                 host->buf_size =
2461                                         host->slot[1]->mmc->max_req_size;
2462                 }
2463         }
2464 
2465         if (!nr_slots) {
2466                 dev_err(&pdev->dev, "init failed: no slot defined\n");
2467                 goto err_init_slot;
2468         }
2469 
2470         if (!host->caps.has_rwproof) {
2471                 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2472                                                   &host->buf_phys_addr,
2473                                                   GFP_KERNEL);
2474                 if (!host->buffer) {
2475                         ret = -ENOMEM;
2476                         dev_err(&pdev->dev, "buffer allocation failed\n");
2477                         goto err_dma_alloc;
2478                 }
2479         }
2480 
2481         dev_info(&pdev->dev,
2482                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2483                         host->mapbase, irq, nr_slots);
2484 
2485         pm_runtime_mark_last_busy(&host->pdev->dev);
2486         pm_runtime_put_autosuspend(&pdev->dev);
2487 
2488         return 0;
2489 
2490 err_dma_alloc:
2491         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2492                 if (host->slot[i])
2493                         atmci_cleanup_slot(host->slot[i], i);
2494         }
2495 err_init_slot:
2496         clk_disable_unprepare(host->mck);
2497 
2498         pm_runtime_disable(&pdev->dev);
2499         pm_runtime_put_noidle(&pdev->dev);
2500 
2501         del_timer_sync(&host->timer);
2502         if (!IS_ERR(host->dma.chan))
2503                 dma_release_channel(host->dma.chan);
2504 err_dma_probe_defer:
2505         free_irq(irq, host);
2506         return ret;
2507 }
2508 
2509 static int atmci_remove(struct platform_device *pdev)
2510 {
2511         struct atmel_mci        *host = platform_get_drvdata(pdev);
2512         unsigned int            i;
2513 
2514         pm_runtime_get_sync(&pdev->dev);
2515 
2516         if (host->buffer)
2517                 dma_free_coherent(&pdev->dev, host->buf_size,
2518                                   host->buffer, host->buf_phys_addr);
2519 
2520         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2521                 if (host->slot[i])
2522                         atmci_cleanup_slot(host->slot[i], i);
2523         }
2524 
2525         atmci_writel(host, ATMCI_IDR, ~0UL);
2526         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2527         atmci_readl(host, ATMCI_SR);
2528 
2529         del_timer_sync(&host->timer);
2530         if (!IS_ERR(host->dma.chan))
2531                 dma_release_channel(host->dma.chan);
2532 
2533         free_irq(platform_get_irq(pdev, 0), host);
2534 
2535         clk_disable_unprepare(host->mck);
2536 
2537         pm_runtime_disable(&pdev->dev);
2538         pm_runtime_put_noidle(&pdev->dev);
2539 
2540         return 0;
2541 }
2542 
2543 #ifdef CONFIG_PM
2544 static int atmci_runtime_suspend(struct device *dev)
2545 {
2546         struct atmel_mci *host = dev_get_drvdata(dev);
2547 
2548         clk_disable_unprepare(host->mck);
2549 
2550         pinctrl_pm_select_sleep_state(dev);
2551 
2552         return 0;
2553 }
2554 
2555 static int atmci_runtime_resume(struct device *dev)
2556 {
2557         struct atmel_mci *host = dev_get_drvdata(dev);
2558 
2559         pinctrl_pm_select_default_state(dev);
2560 
2561         return clk_prepare_enable(host->mck);
2562 }
2563 #endif
2564 
2565 static const struct dev_pm_ops atmci_dev_pm_ops = {
2566         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2567                                 pm_runtime_force_resume)
2568         SET_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
2569 };
2570 
2571 static struct platform_driver atmci_driver = {
2572         .probe          = atmci_probe,
2573         .remove         = atmci_remove,
2574         .driver         = {
2575                 .name           = "atmel_mci",
2576                 .of_match_table = of_match_ptr(atmci_dt_ids),
2577                 .pm             = &atmci_dev_pm_ops,
2578         },
2579 };
2580 module_platform_driver(atmci_driver);
2581 
2582 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2583 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2584 MODULE_LICENSE("GPL v2");
2585 

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