Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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

  1 /*
  2  * Atmel MultiMedia Card Interface driver
  3  *
  4  * Copyright (C) 2004-2008 Atmel Corporation
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/blkdev.h>
 11 #include <linux/clk.h>
 12 #include <linux/debugfs.h>
 13 #include <linux/device.h>
 14 #include <linux/dmaengine.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/err.h>
 17 #include <linux/gpio.h>
 18 #include <linux/init.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/io.h>
 21 #include <linux/ioport.h>
 22 #include <linux/module.h>
 23 #include <linux/of.h>
 24 #include <linux/of_device.h>
 25 #include <linux/of_gpio.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/scatterlist.h>
 28 #include <linux/seq_file.h>
 29 #include <linux/slab.h>
 30 #include <linux/stat.h>
 31 #include <linux/types.h>
 32 #include <linux/platform_data/atmel.h>
 33 #include <linux/platform_data/mmc-atmel-mci.h>
 34 
 35 #include <linux/mmc/host.h>
 36 #include <linux/mmc/sdio.h>
 37 
 38 #include <linux/atmel-mci.h>
 39 #include <linux/atmel_pdc.h>
 40 #include <linux/pm.h>
 41 #include <linux/pm_runtime.h>
 42 #include <linux/pinctrl/consumer.h>
 43 
 44 #include <asm/cacheflush.h>
 45 #include <asm/io.h>
 46 #include <asm/unaligned.h>
 47 
 48 #include "atmel-mci-regs.h"
 49 
 50 #define AUTOSUSPEND_DELAY       50
 51 
 52 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
 53 #define ATMCI_DMA_THRESHOLD     16
 54 
 55 enum {
 56         EVENT_CMD_RDY = 0,
 57         EVENT_XFER_COMPLETE,
 58         EVENT_NOTBUSY,
 59         EVENT_DATA_ERROR,
 60 };
 61 
 62 enum atmel_mci_state {
 63         STATE_IDLE = 0,
 64         STATE_SENDING_CMD,
 65         STATE_DATA_XFER,
 66         STATE_WAITING_NOTBUSY,
 67         STATE_SENDING_STOP,
 68         STATE_END_REQUEST,
 69 };
 70 
 71 enum atmci_xfer_dir {
 72         XFER_RECEIVE = 0,
 73         XFER_TRANSMIT,
 74 };
 75 
 76 enum atmci_pdc_buf {
 77         PDC_FIRST_BUF = 0,
 78         PDC_SECOND_BUF,
 79 };
 80 
 81 struct atmel_mci_caps {
 82         bool    has_dma_conf_reg;
 83         bool    has_pdc;
 84         bool    has_cfg_reg;
 85         bool    has_cstor_reg;
 86         bool    has_highspeed;
 87         bool    has_rwproof;
 88         bool    has_odd_clk_div;
 89         bool    has_bad_data_ordering;
 90         bool    need_reset_after_xfer;
 91         bool    need_blksz_mul_4;
 92         bool    need_notbusy_for_read_ops;
 93 };
 94 
 95 struct atmel_mci_dma {
 96         struct dma_chan                 *chan;
 97         struct dma_async_tx_descriptor  *data_desc;
 98 };
 99 
100 /**
101  * struct atmel_mci - MMC controller state shared between all slots
102  * @lock: Spinlock protecting the queue and associated data.
103  * @regs: Pointer to MMIO registers.
104  * @sg: Scatterlist entry currently being processed by PIO or PDC code.
105  * @pio_offset: Offset into the current scatterlist entry.
106  * @buffer: Buffer used if we don't have the r/w proof capability. We
107  *      don't have the time to switch pdc buffers so we have to use only
108  *      one buffer for the full transaction.
109  * @buf_size: size of the buffer.
110  * @phys_buf_addr: buffer address needed for pdc.
111  * @cur_slot: The slot which is currently using the controller.
112  * @mrq: The request currently being processed on @cur_slot,
113  *      or NULL if the controller is idle.
114  * @cmd: The command currently being sent to the card, or NULL.
115  * @data: The data currently being transferred, or NULL if no data
116  *      transfer is in progress.
117  * @data_size: just data->blocks * data->blksz.
118  * @dma: DMA client state.
119  * @data_chan: DMA channel being used for the current data transfer.
120  * @cmd_status: Snapshot of SR taken upon completion of the current
121  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
122  * @data_status: Snapshot of SR taken upon completion of the current
123  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
124  *      EVENT_DATA_ERROR is pending.
125  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
126  *      to be sent.
127  * @tasklet: Tasklet running the request state machine.
128  * @pending_events: Bitmask of events flagged by the interrupt handler
129  *      to be processed by the tasklet.
130  * @completed_events: Bitmask of events which the state machine has
131  *      processed.
132  * @state: Tasklet state.
133  * @queue: List of slots waiting for access to the controller.
134  * @need_clock_update: Update the clock rate before the next request.
135  * @need_reset: Reset controller before next request.
136  * @timer: Timer to balance the data timeout error flag which cannot rise.
137  * @mode_reg: Value of the MR register.
138  * @cfg_reg: Value of the CFG register.
139  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
140  *      rate and timeout calculations.
141  * @mapbase: Physical address of the MMIO registers.
142  * @mck: The peripheral bus clock hooked up to the MMC controller.
143  * @pdev: Platform device associated with the MMC controller.
144  * @slot: Slots sharing this MMC controller.
145  * @caps: MCI capabilities depending on MCI version.
146  * @prepare_data: function to setup MCI before data transfer which
147  * depends on MCI capabilities.
148  * @submit_data: function to start data transfer which depends on MCI
149  * capabilities.
150  * @stop_transfer: function to stop data transfer which depends on MCI
151  * capabilities.
152  *
153  * Locking
154  * =======
155  *
156  * @lock is a softirq-safe spinlock protecting @queue as well as
157  * @cur_slot, @mrq and @state. These must always be updated
158  * at the same time while holding @lock.
159  *
160  * @lock also protects mode_reg and need_clock_update since these are
161  * used to synchronize mode register updates with the queue
162  * processing.
163  *
164  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
165  * and must always be written at the same time as the slot is added to
166  * @queue.
167  *
168  * @pending_events and @completed_events are accessed using atomic bit
169  * operations, so they don't need any locking.
170  *
171  * None of the fields touched by the interrupt handler need any
172  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
173  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
174  * interrupts must be disabled and @data_status updated with a
175  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
176  * CMDRDY interrupt must be disabled and @cmd_status updated with a
177  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
178  * bytes_xfered field of @data must be written. This is ensured by
179  * using barriers.
180  */
181 struct atmel_mci {
182         spinlock_t              lock;
183         void __iomem            *regs;
184 
185         struct scatterlist      *sg;
186         unsigned int            sg_len;
187         unsigned int            pio_offset;
188         unsigned int            *buffer;
189         unsigned int            buf_size;
190         dma_addr_t              buf_phys_addr;
191 
192         struct atmel_mci_slot   *cur_slot;
193         struct mmc_request      *mrq;
194         struct mmc_command      *cmd;
195         struct mmc_data         *data;
196         unsigned int            data_size;
197 
198         struct atmel_mci_dma    dma;
199         struct dma_chan         *data_chan;
200         struct dma_slave_config dma_conf;
201 
202         u32                     cmd_status;
203         u32                     data_status;
204         u32                     stop_cmdr;
205 
206         struct tasklet_struct   tasklet;
207         unsigned long           pending_events;
208         unsigned long           completed_events;
209         enum atmel_mci_state    state;
210         struct list_head        queue;
211 
212         bool                    need_clock_update;
213         bool                    need_reset;
214         struct timer_list       timer;
215         u32                     mode_reg;
216         u32                     cfg_reg;
217         unsigned long           bus_hz;
218         unsigned long           mapbase;
219         struct clk              *mck;
220         struct platform_device  *pdev;
221 
222         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
223 
224         struct atmel_mci_caps   caps;
225 
226         u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
227         void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
228         void (*stop_transfer)(struct atmel_mci *host);
229 };
230 
231 /**
232  * struct atmel_mci_slot - MMC slot state
233  * @mmc: The mmc_host representing this slot.
234  * @host: The MMC controller this slot is using.
235  * @sdc_reg: Value of SDCR to be written before using this slot.
236  * @sdio_irq: SDIO irq mask for this slot.
237  * @mrq: mmc_request currently being processed or waiting to be
238  *      processed, or NULL when the slot is idle.
239  * @queue_node: List node for placing this node in the @queue list of
240  *      &struct atmel_mci.
241  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
242  * @flags: Random state bits associated with the slot.
243  * @detect_pin: GPIO pin used for card detection, or negative if not
244  *      available.
245  * @wp_pin: GPIO pin used for card write protect sending, or negative
246  *      if not available.
247  * @detect_is_active_high: The state of the detect pin when it is active.
248  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
249  */
250 struct atmel_mci_slot {
251         struct mmc_host         *mmc;
252         struct atmel_mci        *host;
253 
254         u32                     sdc_reg;
255         u32                     sdio_irq;
256 
257         struct mmc_request      *mrq;
258         struct list_head        queue_node;
259 
260         unsigned int            clock;
261         unsigned long           flags;
262 #define ATMCI_CARD_PRESENT      0
263 #define ATMCI_CARD_NEED_INIT    1
264 #define ATMCI_SHUTDOWN          2
265 
266         int                     detect_pin;
267         int                     wp_pin;
268         bool                    detect_is_active_high;
269 
270         struct timer_list       detect_timer;
271 };
272 
273 #define atmci_test_and_clear_pending(host, event)               \
274         test_and_clear_bit(event, &host->pending_events)
275 #define atmci_set_completed(host, event)                        \
276         set_bit(event, &host->completed_events)
277 #define atmci_set_pending(host, event)                          \
278         set_bit(event, &host->pending_events)
279 
280 /*
281  * The debugfs stuff below is mostly optimized away when
282  * CONFIG_DEBUG_FS is not set.
283  */
284 static int atmci_req_show(struct seq_file *s, void *v)
285 {
286         struct atmel_mci_slot   *slot = s->private;
287         struct mmc_request      *mrq;
288         struct mmc_command      *cmd;
289         struct mmc_command      *stop;
290         struct mmc_data         *data;
291 
292         /* Make sure we get a consistent snapshot */
293         spin_lock_bh(&slot->host->lock);
294         mrq = slot->mrq;
295 
296         if (mrq) {
297                 cmd = mrq->cmd;
298                 data = mrq->data;
299                 stop = mrq->stop;
300 
301                 if (cmd)
302                         seq_printf(s,
303                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
304                                 cmd->opcode, cmd->arg, cmd->flags,
305                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
306                                 cmd->resp[3], cmd->error);
307                 if (data)
308                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
309                                 data->bytes_xfered, data->blocks,
310                                 data->blksz, data->flags, data->error);
311                 if (stop)
312                         seq_printf(s,
313                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
314                                 stop->opcode, stop->arg, stop->flags,
315                                 stop->resp[0], stop->resp[1], stop->resp[2],
316                                 stop->resp[3], stop->error);
317         }
318 
319         spin_unlock_bh(&slot->host->lock);
320 
321         return 0;
322 }
323 
324 static int atmci_req_open(struct inode *inode, struct file *file)
325 {
326         return single_open(file, atmci_req_show, inode->i_private);
327 }
328 
329 static const struct file_operations atmci_req_fops = {
330         .owner          = THIS_MODULE,
331         .open           = atmci_req_open,
332         .read           = seq_read,
333         .llseek         = seq_lseek,
334         .release        = single_release,
335 };
336 
337 static void atmci_show_status_reg(struct seq_file *s,
338                 const char *regname, u32 value)
339 {
340         static const char       *sr_bit[] = {
341                 [0]     = "CMDRDY",
342                 [1]     = "RXRDY",
343                 [2]     = "TXRDY",
344                 [3]     = "BLKE",
345                 [4]     = "DTIP",
346                 [5]     = "NOTBUSY",
347                 [6]     = "ENDRX",
348                 [7]     = "ENDTX",
349                 [8]     = "SDIOIRQA",
350                 [9]     = "SDIOIRQB",
351                 [12]    = "SDIOWAIT",
352                 [14]    = "RXBUFF",
353                 [15]    = "TXBUFE",
354                 [16]    = "RINDE",
355                 [17]    = "RDIRE",
356                 [18]    = "RCRCE",
357                 [19]    = "RENDE",
358                 [20]    = "RTOE",
359                 [21]    = "DCRCE",
360                 [22]    = "DTOE",
361                 [23]    = "CSTOE",
362                 [24]    = "BLKOVRE",
363                 [25]    = "DMADONE",
364                 [26]    = "FIFOEMPTY",
365                 [27]    = "XFRDONE",
366                 [30]    = "OVRE",
367                 [31]    = "UNRE",
368         };
369         unsigned int            i;
370 
371         seq_printf(s, "%s:\t0x%08x", regname, value);
372         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
373                 if (value & (1 << i)) {
374                         if (sr_bit[i])
375                                 seq_printf(s, " %s", sr_bit[i]);
376                         else
377                                 seq_puts(s, " UNKNOWN");
378                 }
379         }
380         seq_putc(s, '\n');
381 }
382 
383 static int atmci_regs_show(struct seq_file *s, void *v)
384 {
385         struct atmel_mci        *host = s->private;
386         u32                     *buf;
387         int                     ret = 0;
388 
389 
390         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
391         if (!buf)
392                 return -ENOMEM;
393 
394         pm_runtime_get_sync(&host->pdev->dev);
395 
396         /*
397          * Grab a more or less consistent snapshot. Note that we're
398          * not disabling interrupts, so IMR and SR may not be
399          * consistent.
400          */
401         spin_lock_bh(&host->lock);
402         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
403         spin_unlock_bh(&host->lock);
404 
405         pm_runtime_mark_last_busy(&host->pdev->dev);
406         pm_runtime_put_autosuspend(&host->pdev->dev);
407 
408         seq_printf(s, "MR:\t0x%08x%s%s ",
409                         buf[ATMCI_MR / 4],
410                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
411                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
412         if (host->caps.has_odd_clk_div)
413                 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
414                                 ((buf[ATMCI_MR / 4] & 0xff) << 1)
415                                 | ((buf[ATMCI_MR / 4] >> 16) & 1));
416         else
417                 seq_printf(s, "CLKDIV=%u\n",
418                                 (buf[ATMCI_MR / 4] & 0xff));
419         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
420         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
421         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
422         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
423                         buf[ATMCI_BLKR / 4],
424                         buf[ATMCI_BLKR / 4] & 0xffff,
425                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
426         if (host->caps.has_cstor_reg)
427                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
428 
429         /* Don't read RSPR and RDR; it will consume the data there */
430 
431         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
432         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
433 
434         if (host->caps.has_dma_conf_reg) {
435                 u32 val;
436 
437                 val = buf[ATMCI_DMA / 4];
438                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
439                                 val, val & 3,
440                                 ((val >> 4) & 3) ?
441                                         1 << (((val >> 4) & 3) + 1) : 1,
442                                 val & ATMCI_DMAEN ? " DMAEN" : "");
443         }
444         if (host->caps.has_cfg_reg) {
445                 u32 val;
446 
447                 val = buf[ATMCI_CFG / 4];
448                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
449                                 val,
450                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
451                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
452                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
453                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
454         }
455 
456         kfree(buf);
457 
458         return ret;
459 }
460 
461 static int atmci_regs_open(struct inode *inode, struct file *file)
462 {
463         return single_open(file, atmci_regs_show, inode->i_private);
464 }
465 
466 static const struct file_operations atmci_regs_fops = {
467         .owner          = THIS_MODULE,
468         .open           = atmci_regs_open,
469         .read           = seq_read,
470         .llseek         = seq_lseek,
471         .release        = single_release,
472 };
473 
474 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
475 {
476         struct mmc_host         *mmc = slot->mmc;
477         struct atmel_mci        *host = slot->host;
478         struct dentry           *root;
479         struct dentry           *node;
480 
481         root = mmc->debugfs_root;
482         if (!root)
483                 return;
484 
485         node = debugfs_create_file("regs", S_IRUSR, root, host,
486                         &atmci_regs_fops);
487         if (IS_ERR(node))
488                 return;
489         if (!node)
490                 goto err;
491 
492         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
493         if (!node)
494                 goto err;
495 
496         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
497         if (!node)
498                 goto err;
499 
500         node = debugfs_create_x32("pending_events", S_IRUSR, root,
501                                      (u32 *)&host->pending_events);
502         if (!node)
503                 goto err;
504 
505         node = debugfs_create_x32("completed_events", S_IRUSR, root,
506                                      (u32 *)&host->completed_events);
507         if (!node)
508                 goto err;
509 
510         return;
511 
512 err:
513         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
514 }
515 
516 #if defined(CONFIG_OF)
517 static const struct of_device_id atmci_dt_ids[] = {
518         { .compatible = "atmel,hsmci" },
519         { /* sentinel */ }
520 };
521 
522 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
523 
524 static struct mci_platform_data*
525 atmci_of_init(struct platform_device *pdev)
526 {
527         struct device_node *np = pdev->dev.of_node;
528         struct device_node *cnp;
529         struct mci_platform_data *pdata;
530         u32 slot_id;
531 
532         if (!np) {
533                 dev_err(&pdev->dev, "device node not found\n");
534                 return ERR_PTR(-EINVAL);
535         }
536 
537         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
538         if (!pdata) {
539                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
540                 return ERR_PTR(-ENOMEM);
541         }
542 
543         for_each_child_of_node(np, cnp) {
544                 if (of_property_read_u32(cnp, "reg", &slot_id)) {
545                         dev_warn(&pdev->dev, "reg property is missing for %s\n",
546                                  cnp->full_name);
547                         continue;
548                 }
549 
550                 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
551                         dev_warn(&pdev->dev, "can't have more than %d slots\n",
552                                  ATMCI_MAX_NR_SLOTS);
553                         break;
554                 }
555 
556                 if (of_property_read_u32(cnp, "bus-width",
557                                          &pdata->slot[slot_id].bus_width))
558                         pdata->slot[slot_id].bus_width = 1;
559 
560                 pdata->slot[slot_id].detect_pin =
561                         of_get_named_gpio(cnp, "cd-gpios", 0);
562 
563                 pdata->slot[slot_id].detect_is_active_high =
564                         of_property_read_bool(cnp, "cd-inverted");
565 
566                 pdata->slot[slot_id].non_removable =
567                         of_property_read_bool(cnp, "non-removable");
568 
569                 pdata->slot[slot_id].wp_pin =
570                         of_get_named_gpio(cnp, "wp-gpios", 0);
571         }
572 
573         return pdata;
574 }
575 #else /* CONFIG_OF */
576 static inline struct mci_platform_data*
577 atmci_of_init(struct platform_device *dev)
578 {
579         return ERR_PTR(-EINVAL);
580 }
581 #endif
582 
583 static inline unsigned int atmci_get_version(struct atmel_mci *host)
584 {
585         return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
586 }
587 
588 static void atmci_timeout_timer(unsigned long data)
589 {
590         struct atmel_mci *host;
591 
592         host = (struct atmel_mci *)data;
593 
594         dev_dbg(&host->pdev->dev, "software timeout\n");
595 
596         if (host->mrq->cmd->data) {
597                 host->mrq->cmd->data->error = -ETIMEDOUT;
598                 host->data = NULL;
599                 /*
600                  * With some SDIO modules, sometimes DMA transfer hangs. If
601                  * stop_transfer() is not called then the DMA request is not
602                  * removed, following ones are queued and never computed.
603                  */
604                 if (host->state == STATE_DATA_XFER)
605                         host->stop_transfer(host);
606         } else {
607                 host->mrq->cmd->error = -ETIMEDOUT;
608                 host->cmd = NULL;
609         }
610         host->need_reset = 1;
611         host->state = STATE_END_REQUEST;
612         smp_wmb();
613         tasklet_schedule(&host->tasklet);
614 }
615 
616 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
617                                         unsigned int ns)
618 {
619         /*
620          * It is easier here to use us instead of ns for the timeout,
621          * it prevents from overflows during calculation.
622          */
623         unsigned int us = DIV_ROUND_UP(ns, 1000);
624 
625         /* Maximum clock frequency is host->bus_hz/2 */
626         return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
627 }
628 
629 static void atmci_set_timeout(struct atmel_mci *host,
630                 struct atmel_mci_slot *slot, struct mmc_data *data)
631 {
632         static unsigned dtomul_to_shift[] = {
633                 0, 4, 7, 8, 10, 12, 16, 20
634         };
635         unsigned        timeout;
636         unsigned        dtocyc;
637         unsigned        dtomul;
638 
639         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
640                 + data->timeout_clks;
641 
642         for (dtomul = 0; dtomul < 8; dtomul++) {
643                 unsigned shift = dtomul_to_shift[dtomul];
644                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
645                 if (dtocyc < 15)
646                         break;
647         }
648 
649         if (dtomul >= 8) {
650                 dtomul = 7;
651                 dtocyc = 15;
652         }
653 
654         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
655                         dtocyc << dtomul_to_shift[dtomul]);
656         atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
657 }
658 
659 /*
660  * Return mask with command flags to be enabled for this command.
661  */
662 static u32 atmci_prepare_command(struct mmc_host *mmc,
663                                  struct mmc_command *cmd)
664 {
665         struct mmc_data *data;
666         u32             cmdr;
667 
668         cmd->error = -EINPROGRESS;
669 
670         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
671 
672         if (cmd->flags & MMC_RSP_PRESENT) {
673                 if (cmd->flags & MMC_RSP_136)
674                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
675                 else
676                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
677         }
678 
679         /*
680          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
681          * it's too difficult to determine whether this is an ACMD or
682          * not. Better make it 64.
683          */
684         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
685 
686         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
687                 cmdr |= ATMCI_CMDR_OPDCMD;
688 
689         data = cmd->data;
690         if (data) {
691                 cmdr |= ATMCI_CMDR_START_XFER;
692 
693                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
694                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
695                 } else {
696                         if (data->flags & MMC_DATA_STREAM)
697                                 cmdr |= ATMCI_CMDR_STREAM;
698                         else if (data->blocks > 1)
699                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
700                         else
701                                 cmdr |= ATMCI_CMDR_BLOCK;
702                 }
703 
704                 if (data->flags & MMC_DATA_READ)
705                         cmdr |= ATMCI_CMDR_TRDIR_READ;
706         }
707 
708         return cmdr;
709 }
710 
711 static void atmci_send_command(struct atmel_mci *host,
712                 struct mmc_command *cmd, u32 cmd_flags)
713 {
714         WARN_ON(host->cmd);
715         host->cmd = cmd;
716 
717         dev_vdbg(&host->pdev->dev,
718                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
719                         cmd->arg, cmd_flags);
720 
721         atmci_writel(host, ATMCI_ARGR, cmd->arg);
722         atmci_writel(host, ATMCI_CMDR, cmd_flags);
723 }
724 
725 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
726 {
727         dev_dbg(&host->pdev->dev, "send stop command\n");
728         atmci_send_command(host, data->stop, host->stop_cmdr);
729         atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
730 }
731 
732 /*
733  * Configure given PDC buffer taking care of alignement issues.
734  * Update host->data_size and host->sg.
735  */
736 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
737         enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
738 {
739         u32 pointer_reg, counter_reg;
740         unsigned int buf_size;
741 
742         if (dir == XFER_RECEIVE) {
743                 pointer_reg = ATMEL_PDC_RPR;
744                 counter_reg = ATMEL_PDC_RCR;
745         } else {
746                 pointer_reg = ATMEL_PDC_TPR;
747                 counter_reg = ATMEL_PDC_TCR;
748         }
749 
750         if (buf_nb == PDC_SECOND_BUF) {
751                 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
752                 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
753         }
754 
755         if (!host->caps.has_rwproof) {
756                 buf_size = host->buf_size;
757                 atmci_writel(host, pointer_reg, host->buf_phys_addr);
758         } else {
759                 buf_size = sg_dma_len(host->sg);
760                 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
761         }
762 
763         if (host->data_size <= buf_size) {
764                 if (host->data_size & 0x3) {
765                         /* If size is different from modulo 4, transfer bytes */
766                         atmci_writel(host, counter_reg, host->data_size);
767                         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
768                 } else {
769                         /* Else transfer 32-bits words */
770                         atmci_writel(host, counter_reg, host->data_size / 4);
771                 }
772                 host->data_size = 0;
773         } else {
774                 /* We assume the size of a page is 32-bits aligned */
775                 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
776                 host->data_size -= sg_dma_len(host->sg);
777                 if (host->data_size)
778                         host->sg = sg_next(host->sg);
779         }
780 }
781 
782 /*
783  * Configure PDC buffer according to the data size ie configuring one or two
784  * buffers. Don't use this function if you want to configure only the second
785  * buffer. In this case, use atmci_pdc_set_single_buf.
786  */
787 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
788 {
789         atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
790         if (host->data_size)
791                 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
792 }
793 
794 /*
795  * Unmap sg lists, called when transfer is finished.
796  */
797 static void atmci_pdc_cleanup(struct atmel_mci *host)
798 {
799         struct mmc_data         *data = host->data;
800 
801         if (data)
802                 dma_unmap_sg(&host->pdev->dev,
803                                 data->sg, data->sg_len,
804                                 ((data->flags & MMC_DATA_WRITE)
805                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
806 }
807 
808 /*
809  * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
810  * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
811  * interrupt needed for both transfer directions.
812  */
813 static void atmci_pdc_complete(struct atmel_mci *host)
814 {
815         int transfer_size = host->data->blocks * host->data->blksz;
816         int i;
817 
818         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
819 
820         if ((!host->caps.has_rwproof)
821             && (host->data->flags & MMC_DATA_READ)) {
822                 if (host->caps.has_bad_data_ordering)
823                         for (i = 0; i < transfer_size; i++)
824                                 host->buffer[i] = swab32(host->buffer[i]);
825                 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
826                                     host->buffer, transfer_size);
827         }
828 
829         atmci_pdc_cleanup(host);
830 
831         dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
832         atmci_set_pending(host, EVENT_XFER_COMPLETE);
833         tasklet_schedule(&host->tasklet);
834 }
835 
836 static void atmci_dma_cleanup(struct atmel_mci *host)
837 {
838         struct mmc_data                 *data = host->data;
839 
840         if (data)
841                 dma_unmap_sg(host->dma.chan->device->dev,
842                                 data->sg, data->sg_len,
843                                 ((data->flags & MMC_DATA_WRITE)
844                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
845 }
846 
847 /*
848  * This function is called by the DMA driver from tasklet context.
849  */
850 static void atmci_dma_complete(void *arg)
851 {
852         struct atmel_mci        *host = arg;
853         struct mmc_data         *data = host->data;
854 
855         dev_vdbg(&host->pdev->dev, "DMA complete\n");
856 
857         if (host->caps.has_dma_conf_reg)
858                 /* Disable DMA hardware handshaking on MCI */
859                 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
860 
861         atmci_dma_cleanup(host);
862 
863         /*
864          * If the card was removed, data will be NULL. No point trying
865          * to send the stop command or waiting for NBUSY in this case.
866          */
867         if (data) {
868                 dev_dbg(&host->pdev->dev,
869                         "(%s) set pending xfer complete\n", __func__);
870                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
871                 tasklet_schedule(&host->tasklet);
872 
873                 /*
874                  * Regardless of what the documentation says, we have
875                  * to wait for NOTBUSY even after block read
876                  * operations.
877                  *
878                  * When the DMA transfer is complete, the controller
879                  * may still be reading the CRC from the card, i.e.
880                  * the data transfer is still in progress and we
881                  * haven't seen all the potential error bits yet.
882                  *
883                  * The interrupt handler will schedule a different
884                  * tasklet to finish things up when the data transfer
885                  * is completely done.
886                  *
887                  * We may not complete the mmc request here anyway
888                  * because the mmc layer may call back and cause us to
889                  * violate the "don't submit new operations from the
890                  * completion callback" rule of the dma engine
891                  * framework.
892                  */
893                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
894         }
895 }
896 
897 /*
898  * Returns a mask of interrupt flags to be enabled after the whole
899  * request has been prepared.
900  */
901 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
902 {
903         u32 iflags;
904 
905         data->error = -EINPROGRESS;
906 
907         host->sg = data->sg;
908         host->sg_len = data->sg_len;
909         host->data = data;
910         host->data_chan = NULL;
911 
912         iflags = ATMCI_DATA_ERROR_FLAGS;
913 
914         /*
915          * Errata: MMC data write operation with less than 12
916          * bytes is impossible.
917          *
918          * Errata: MCI Transmit Data Register (TDR) FIFO
919          * corruption when length is not multiple of 4.
920          */
921         if (data->blocks * data->blksz < 12
922                         || (data->blocks * data->blksz) & 3)
923                 host->need_reset = true;
924 
925         host->pio_offset = 0;
926         if (data->flags & MMC_DATA_READ)
927                 iflags |= ATMCI_RXRDY;
928         else
929                 iflags |= ATMCI_TXRDY;
930 
931         return iflags;
932 }
933 
934 /*
935  * Set interrupt flags and set block length into the MCI mode register even
936  * if this value is also accessible in the MCI block register. It seems to be
937  * necessary before the High Speed MCI version. It also map sg and configure
938  * PDC registers.
939  */
940 static u32
941 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
942 {
943         u32 iflags, tmp;
944         unsigned int sg_len;
945         enum dma_data_direction dir;
946         int i;
947 
948         data->error = -EINPROGRESS;
949 
950         host->data = data;
951         host->sg = data->sg;
952         iflags = ATMCI_DATA_ERROR_FLAGS;
953 
954         /* Enable pdc mode */
955         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
956 
957         if (data->flags & MMC_DATA_READ) {
958                 dir = DMA_FROM_DEVICE;
959                 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
960         } else {
961                 dir = DMA_TO_DEVICE;
962                 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
963         }
964 
965         /* Set BLKLEN */
966         tmp = atmci_readl(host, ATMCI_MR);
967         tmp &= 0x0000ffff;
968         tmp |= ATMCI_BLKLEN(data->blksz);
969         atmci_writel(host, ATMCI_MR, tmp);
970 
971         /* Configure PDC */
972         host->data_size = data->blocks * data->blksz;
973         sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
974 
975         if ((!host->caps.has_rwproof)
976             && (host->data->flags & MMC_DATA_WRITE)) {
977                 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
978                                   host->buffer, host->data_size);
979                 if (host->caps.has_bad_data_ordering)
980                         for (i = 0; i < host->data_size; i++)
981                                 host->buffer[i] = swab32(host->buffer[i]);
982         }
983 
984         if (host->data_size)
985                 atmci_pdc_set_both_buf(host,
986                         ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
987 
988         return iflags;
989 }
990 
991 static u32
992 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
993 {
994         struct dma_chan                 *chan;
995         struct dma_async_tx_descriptor  *desc;
996         struct scatterlist              *sg;
997         unsigned int                    i;
998         enum dma_data_direction         direction;
999         enum dma_transfer_direction     slave_dirn;
1000         unsigned int                    sglen;
1001         u32                             maxburst;
1002         u32 iflags;
1003 
1004         data->error = -EINPROGRESS;
1005 
1006         WARN_ON(host->data);
1007         host->sg = NULL;
1008         host->data = data;
1009 
1010         iflags = ATMCI_DATA_ERROR_FLAGS;
1011 
1012         /*
1013          * We don't do DMA on "complex" transfers, i.e. with
1014          * non-word-aligned buffers or lengths. Also, we don't bother
1015          * with all the DMA setup overhead for short transfers.
1016          */
1017         if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1018                 return atmci_prepare_data(host, data);
1019         if (data->blksz & 3)
1020                 return atmci_prepare_data(host, data);
1021 
1022         for_each_sg(data->sg, sg, data->sg_len, i) {
1023                 if (sg->offset & 3 || sg->length & 3)
1024                         return atmci_prepare_data(host, data);
1025         }
1026 
1027         /* If we don't have a channel, we can't do DMA */
1028         chan = host->dma.chan;
1029         if (chan)
1030                 host->data_chan = chan;
1031 
1032         if (!chan)
1033                 return -ENODEV;
1034 
1035         if (data->flags & MMC_DATA_READ) {
1036                 direction = DMA_FROM_DEVICE;
1037                 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1038                 maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
1039         } else {
1040                 direction = DMA_TO_DEVICE;
1041                 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1042                 maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
1043         }
1044 
1045         if (host->caps.has_dma_conf_reg)
1046                 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1047                         ATMCI_DMAEN);
1048 
1049         sglen = dma_map_sg(chan->device->dev, data->sg,
1050                         data->sg_len, direction);
1051 
1052         dmaengine_slave_config(chan, &host->dma_conf);
1053         desc = dmaengine_prep_slave_sg(chan,
1054                         data->sg, sglen, slave_dirn,
1055                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1056         if (!desc)
1057                 goto unmap_exit;
1058 
1059         host->dma.data_desc = desc;
1060         desc->callback = atmci_dma_complete;
1061         desc->callback_param = host;
1062 
1063         return iflags;
1064 unmap_exit:
1065         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1066         return -ENOMEM;
1067 }
1068 
1069 static void
1070 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1071 {
1072         return;
1073 }
1074 
1075 /*
1076  * Start PDC according to transfer direction.
1077  */
1078 static void
1079 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1080 {
1081         if (data->flags & MMC_DATA_READ)
1082                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1083         else
1084                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1085 }
1086 
1087 static void
1088 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1089 {
1090         struct dma_chan                 *chan = host->data_chan;
1091         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
1092 
1093         if (chan) {
1094                 dmaengine_submit(desc);
1095                 dma_async_issue_pending(chan);
1096         }
1097 }
1098 
1099 static void atmci_stop_transfer(struct atmel_mci *host)
1100 {
1101         dev_dbg(&host->pdev->dev,
1102                 "(%s) set pending xfer complete\n", __func__);
1103         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1104         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1105 }
1106 
1107 /*
1108  * Stop data transfer because error(s) occurred.
1109  */
1110 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1111 {
1112         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1113 }
1114 
1115 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1116 {
1117         struct dma_chan *chan = host->data_chan;
1118 
1119         if (chan) {
1120                 dmaengine_terminate_all(chan);
1121                 atmci_dma_cleanup(host);
1122         } else {
1123                 /* Data transfer was stopped by the interrupt handler */
1124                 dev_dbg(&host->pdev->dev,
1125                         "(%s) set pending xfer complete\n", __func__);
1126                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1127                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1128         }
1129 }
1130 
1131 /*
1132  * Start a request: prepare data if needed, prepare the command and activate
1133  * interrupts.
1134  */
1135 static void atmci_start_request(struct atmel_mci *host,
1136                 struct atmel_mci_slot *slot)
1137 {
1138         struct mmc_request      *mrq;
1139         struct mmc_command      *cmd;
1140         struct mmc_data         *data;
1141         u32                     iflags;
1142         u32                     cmdflags;
1143 
1144         mrq = slot->mrq;
1145         host->cur_slot = slot;
1146         host->mrq = mrq;
1147 
1148         host->pending_events = 0;
1149         host->completed_events = 0;
1150         host->cmd_status = 0;
1151         host->data_status = 0;
1152 
1153         dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1154 
1155         if (host->need_reset || host->caps.need_reset_after_xfer) {
1156                 iflags = atmci_readl(host, ATMCI_IMR);
1157                 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1158                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1159                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1160                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1161                 if (host->caps.has_cfg_reg)
1162                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1163                 atmci_writel(host, ATMCI_IER, iflags);
1164                 host->need_reset = false;
1165         }
1166         atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1167 
1168         iflags = atmci_readl(host, ATMCI_IMR);
1169         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1170                 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1171                                 iflags);
1172 
1173         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1174                 /* Send init sequence (74 clock cycles) */
1175                 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1176                 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1177                         cpu_relax();
1178         }
1179         iflags = 0;
1180         data = mrq->data;
1181         if (data) {
1182                 atmci_set_timeout(host, slot, data);
1183 
1184                 /* Must set block count/size before sending command */
1185                 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1186                                 | ATMCI_BLKLEN(data->blksz));
1187                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1188                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1189 
1190                 iflags |= host->prepare_data(host, data);
1191         }
1192 
1193         iflags |= ATMCI_CMDRDY;
1194         cmd = mrq->cmd;
1195         cmdflags = atmci_prepare_command(slot->mmc, cmd);
1196 
1197         /*
1198          * DMA transfer should be started before sending the command to avoid
1199          * unexpected errors especially for read operations in SDIO mode.
1200          * Unfortunately, in PDC mode, command has to be sent before starting
1201          * the transfer.
1202          */
1203         if (host->submit_data != &atmci_submit_data_dma)
1204                 atmci_send_command(host, cmd, cmdflags);
1205 
1206         if (data)
1207                 host->submit_data(host, data);
1208 
1209         if (host->submit_data == &atmci_submit_data_dma)
1210                 atmci_send_command(host, cmd, cmdflags);
1211 
1212         if (mrq->stop) {
1213                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1214                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1215                 if (!(data->flags & MMC_DATA_WRITE))
1216                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1217                 if (data->flags & MMC_DATA_STREAM)
1218                         host->stop_cmdr |= ATMCI_CMDR_STREAM;
1219                 else
1220                         host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1221         }
1222 
1223         /*
1224          * We could have enabled interrupts earlier, but I suspect
1225          * that would open up a nice can of interesting race
1226          * conditions (e.g. command and data complete, but stop not
1227          * prepared yet.)
1228          */
1229         atmci_writel(host, ATMCI_IER, iflags);
1230 
1231         mod_timer(&host->timer, jiffies +  msecs_to_jiffies(2000));
1232 }
1233 
1234 static void atmci_queue_request(struct atmel_mci *host,
1235                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1236 {
1237         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1238                         host->state);
1239 
1240         spin_lock_bh(&host->lock);
1241         slot->mrq = mrq;
1242         if (host->state == STATE_IDLE) {
1243                 host->state = STATE_SENDING_CMD;
1244                 atmci_start_request(host, slot);
1245         } else {
1246                 dev_dbg(&host->pdev->dev, "queue request\n");
1247                 list_add_tail(&slot->queue_node, &host->queue);
1248         }
1249         spin_unlock_bh(&host->lock);
1250 }
1251 
1252 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1253 {
1254         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1255         struct atmel_mci        *host = slot->host;
1256         struct mmc_data         *data;
1257 
1258         WARN_ON(slot->mrq);
1259         dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1260 
1261         pm_runtime_get_sync(&host->pdev->dev);
1262 
1263         /*
1264          * We may "know" the card is gone even though there's still an
1265          * electrical connection. If so, we really need to communicate
1266          * this to the MMC core since there won't be any more
1267          * interrupts as the card is completely removed. Otherwise,
1268          * the MMC core might believe the card is still there even
1269          * though the card was just removed very slowly.
1270          */
1271         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1272                 mrq->cmd->error = -ENOMEDIUM;
1273                 mmc_request_done(mmc, mrq);
1274                 return;
1275         }
1276 
1277         /* We don't support multiple blocks of weird lengths. */
1278         data = mrq->data;
1279         if (data && data->blocks > 1 && data->blksz & 3) {
1280                 mrq->cmd->error = -EINVAL;
1281                 mmc_request_done(mmc, mrq);
1282         }
1283 
1284         atmci_queue_request(host, slot, mrq);
1285 }
1286 
1287 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1288 {
1289         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1290         struct atmel_mci        *host = slot->host;
1291         unsigned int            i;
1292 
1293         pm_runtime_get_sync(&host->pdev->dev);
1294 
1295         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1296         switch (ios->bus_width) {
1297         case MMC_BUS_WIDTH_1:
1298                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1299                 break;
1300         case MMC_BUS_WIDTH_4:
1301                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1302                 break;
1303         }
1304 
1305         if (ios->clock) {
1306                 unsigned int clock_min = ~0U;
1307                 int clkdiv;
1308 
1309                 spin_lock_bh(&host->lock);
1310                 if (!host->mode_reg) {
1311                         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1312                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1313                         if (host->caps.has_cfg_reg)
1314                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1315                 }
1316 
1317                 /*
1318                  * Use mirror of ios->clock to prevent race with mmc
1319                  * core ios update when finding the minimum.
1320                  */
1321                 slot->clock = ios->clock;
1322                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1323                         if (host->slot[i] && host->slot[i]->clock
1324                                         && host->slot[i]->clock < clock_min)
1325                                 clock_min = host->slot[i]->clock;
1326                 }
1327 
1328                 /* Calculate clock divider */
1329                 if (host->caps.has_odd_clk_div) {
1330                         clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1331                         if (clkdiv < 0) {
1332                                 dev_warn(&mmc->class_dev,
1333                                          "clock %u too fast; using %lu\n",
1334                                          clock_min, host->bus_hz / 2);
1335                                 clkdiv = 0;
1336                         } else if (clkdiv > 511) {
1337                                 dev_warn(&mmc->class_dev,
1338                                          "clock %u too slow; using %lu\n",
1339                                          clock_min, host->bus_hz / (511 + 2));
1340                                 clkdiv = 511;
1341                         }
1342                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1343                                          | ATMCI_MR_CLKODD(clkdiv & 1);
1344                 } else {
1345                         clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1346                         if (clkdiv > 255) {
1347                                 dev_warn(&mmc->class_dev,
1348                                          "clock %u too slow; using %lu\n",
1349                                          clock_min, host->bus_hz / (2 * 256));
1350                                 clkdiv = 255;
1351                         }
1352                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1353                 }
1354 
1355                 /*
1356                  * WRPROOF and RDPROOF prevent overruns/underruns by
1357                  * stopping the clock when the FIFO is full/empty.
1358                  * This state is not expected to last for long.
1359                  */
1360                 if (host->caps.has_rwproof)
1361                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1362 
1363                 if (host->caps.has_cfg_reg) {
1364                         /* setup High Speed mode in relation with card capacity */
1365                         if (ios->timing == MMC_TIMING_SD_HS)
1366                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
1367                         else
1368                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1369                 }
1370 
1371                 if (list_empty(&host->queue)) {
1372                         atmci_writel(host, ATMCI_MR, host->mode_reg);
1373                         if (host->caps.has_cfg_reg)
1374                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1375                 } else {
1376                         host->need_clock_update = true;
1377                 }
1378 
1379                 spin_unlock_bh(&host->lock);
1380         } else {
1381                 bool any_slot_active = false;
1382 
1383                 spin_lock_bh(&host->lock);
1384                 slot->clock = 0;
1385                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1386                         if (host->slot[i] && host->slot[i]->clock) {
1387                                 any_slot_active = true;
1388                                 break;
1389                         }
1390                 }
1391                 if (!any_slot_active) {
1392                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1393                         if (host->mode_reg) {
1394                                 atmci_readl(host, ATMCI_MR);
1395                         }
1396                         host->mode_reg = 0;
1397                 }
1398                 spin_unlock_bh(&host->lock);
1399         }
1400 
1401         switch (ios->power_mode) {
1402         case MMC_POWER_OFF:
1403                 if (!IS_ERR(mmc->supply.vmmc))
1404                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1405                 break;
1406         case MMC_POWER_UP:
1407                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1408                 if (!IS_ERR(mmc->supply.vmmc))
1409                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1410                 break;
1411         default:
1412                 /*
1413                  * TODO: None of the currently available AVR32-based
1414                  * boards allow MMC power to be turned off. Implement
1415                  * power control when this can be tested properly.
1416                  *
1417                  * We also need to hook this into the clock management
1418                  * somehow so that newly inserted cards aren't
1419                  * subjected to a fast clock before we have a chance
1420                  * to figure out what the maximum rate is. Currently,
1421                  * there's no way to avoid this, and there never will
1422                  * be for boards that don't support power control.
1423                  */
1424                 break;
1425         }
1426 
1427         pm_runtime_mark_last_busy(&host->pdev->dev);
1428         pm_runtime_put_autosuspend(&host->pdev->dev);
1429 }
1430 
1431 static int atmci_get_ro(struct mmc_host *mmc)
1432 {
1433         int                     read_only = -ENOSYS;
1434         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1435 
1436         if (gpio_is_valid(slot->wp_pin)) {
1437                 read_only = gpio_get_value(slot->wp_pin);
1438                 dev_dbg(&mmc->class_dev, "card is %s\n",
1439                                 read_only ? "read-only" : "read-write");
1440         }
1441 
1442         return read_only;
1443 }
1444 
1445 static int atmci_get_cd(struct mmc_host *mmc)
1446 {
1447         int                     present = -ENOSYS;
1448         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1449 
1450         if (gpio_is_valid(slot->detect_pin)) {
1451                 present = !(gpio_get_value(slot->detect_pin) ^
1452                             slot->detect_is_active_high);
1453                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1454                                 present ? "" : "not ");
1455         }
1456 
1457         return present;
1458 }
1459 
1460 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1461 {
1462         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1463         struct atmel_mci        *host = slot->host;
1464 
1465         if (enable)
1466                 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1467         else
1468                 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1469 }
1470 
1471 static const struct mmc_host_ops atmci_ops = {
1472         .request        = atmci_request,
1473         .set_ios        = atmci_set_ios,
1474         .get_ro         = atmci_get_ro,
1475         .get_cd         = atmci_get_cd,
1476         .enable_sdio_irq = atmci_enable_sdio_irq,
1477 };
1478 
1479 /* Called with host->lock held */
1480 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1481         __releases(&host->lock)
1482         __acquires(&host->lock)
1483 {
1484         struct atmel_mci_slot   *slot = NULL;
1485         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1486 
1487         WARN_ON(host->cmd || host->data);
1488 
1489         /*
1490          * Update the MMC clock rate if necessary. This may be
1491          * necessary if set_ios() is called when a different slot is
1492          * busy transferring data.
1493          */
1494         if (host->need_clock_update) {
1495                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1496                 if (host->caps.has_cfg_reg)
1497                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1498         }
1499 
1500         host->cur_slot->mrq = NULL;
1501         host->mrq = NULL;
1502         if (!list_empty(&host->queue)) {
1503                 slot = list_entry(host->queue.next,
1504                                 struct atmel_mci_slot, queue_node);
1505                 list_del(&slot->queue_node);
1506                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1507                                 mmc_hostname(slot->mmc));
1508                 host->state = STATE_SENDING_CMD;
1509                 atmci_start_request(host, slot);
1510         } else {
1511                 dev_vdbg(&host->pdev->dev, "list empty\n");
1512                 host->state = STATE_IDLE;
1513         }
1514 
1515         del_timer(&host->timer);
1516 
1517         spin_unlock(&host->lock);
1518         mmc_request_done(prev_mmc, mrq);
1519         spin_lock(&host->lock);
1520 
1521         pm_runtime_mark_last_busy(&host->pdev->dev);
1522         pm_runtime_put_autosuspend(&host->pdev->dev);
1523 }
1524 
1525 static void atmci_command_complete(struct atmel_mci *host,
1526                         struct mmc_command *cmd)
1527 {
1528         u32             status = host->cmd_status;
1529 
1530         /* Read the response from the card (up to 16 bytes) */
1531         cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1532         cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1533         cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1534         cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1535 
1536         if (status & ATMCI_RTOE)
1537                 cmd->error = -ETIMEDOUT;
1538         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1539                 cmd->error = -EILSEQ;
1540         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1541                 cmd->error = -EIO;
1542         else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1543                 if (host->caps.need_blksz_mul_4) {
1544                         cmd->error = -EINVAL;
1545                         host->need_reset = 1;
1546                 }
1547         } else
1548                 cmd->error = 0;
1549 }
1550 
1551 static void atmci_detect_change(unsigned long data)
1552 {
1553         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
1554         bool                    present;
1555         bool                    present_old;
1556 
1557         /*
1558          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1559          * freeing the interrupt. We must not re-enable the interrupt
1560          * if it has been freed, and if we're shutting down, it
1561          * doesn't really matter whether the card is present or not.
1562          */
1563         smp_rmb();
1564         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1565                 return;
1566 
1567         enable_irq(gpio_to_irq(slot->detect_pin));
1568         present = !(gpio_get_value(slot->detect_pin) ^
1569                     slot->detect_is_active_high);
1570         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1571 
1572         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1573                         present, present_old);
1574 
1575         if (present != present_old) {
1576                 struct atmel_mci        *host = slot->host;
1577                 struct mmc_request      *mrq;
1578 
1579                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1580                         present ? "inserted" : "removed");
1581 
1582                 spin_lock(&host->lock);
1583 
1584                 if (!present)
1585                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1586                 else
1587                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1588 
1589                 /* Clean up queue if present */
1590                 mrq = slot->mrq;
1591                 if (mrq) {
1592                         if (mrq == host->mrq) {
1593                                 /*
1594                                  * Reset controller to terminate any ongoing
1595                                  * commands or data transfers.
1596                                  */
1597                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1598                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1599                                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1600                                 if (host->caps.has_cfg_reg)
1601                                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1602 
1603                                 host->data = NULL;
1604                                 host->cmd = NULL;
1605 
1606                                 switch (host->state) {
1607                                 case STATE_IDLE:
1608                                         break;
1609                                 case STATE_SENDING_CMD:
1610                                         mrq->cmd->error = -ENOMEDIUM;
1611                                         if (mrq->data)
1612                                                 host->stop_transfer(host);
1613                                         break;
1614                                 case STATE_DATA_XFER:
1615                                         mrq->data->error = -ENOMEDIUM;
1616                                         host->stop_transfer(host);
1617                                         break;
1618                                 case STATE_WAITING_NOTBUSY:
1619                                         mrq->data->error = -ENOMEDIUM;
1620                                         break;
1621                                 case STATE_SENDING_STOP:
1622                                         mrq->stop->error = -ENOMEDIUM;
1623                                         break;
1624                                 case STATE_END_REQUEST:
1625                                         break;
1626                                 }
1627 
1628                                 atmci_request_end(host, mrq);
1629                         } else {
1630                                 list_del(&slot->queue_node);
1631                                 mrq->cmd->error = -ENOMEDIUM;
1632                                 if (mrq->data)
1633                                         mrq->data->error = -ENOMEDIUM;
1634                                 if (mrq->stop)
1635                                         mrq->stop->error = -ENOMEDIUM;
1636 
1637                                 spin_unlock(&host->lock);
1638                                 mmc_request_done(slot->mmc, mrq);
1639                                 spin_lock(&host->lock);
1640                         }
1641                 }
1642                 spin_unlock(&host->lock);
1643 
1644                 mmc_detect_change(slot->mmc, 0);
1645         }
1646 }
1647 
1648 static void atmci_tasklet_func(unsigned long priv)
1649 {
1650         struct atmel_mci        *host = (struct atmel_mci *)priv;
1651         struct mmc_request      *mrq = host->mrq;
1652         struct mmc_data         *data = host->data;
1653         enum atmel_mci_state    state = host->state;
1654         enum atmel_mci_state    prev_state;
1655         u32                     status;
1656 
1657         spin_lock(&host->lock);
1658 
1659         state = host->state;
1660 
1661         dev_vdbg(&host->pdev->dev,
1662                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1663                 state, host->pending_events, host->completed_events,
1664                 atmci_readl(host, ATMCI_IMR));
1665 
1666         do {
1667                 prev_state = state;
1668                 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1669 
1670                 switch (state) {
1671                 case STATE_IDLE:
1672                         break;
1673 
1674                 case STATE_SENDING_CMD:
1675                         /*
1676                          * Command has been sent, we are waiting for command
1677                          * ready. Then we have three next states possible:
1678                          * END_REQUEST by default, WAITING_NOTBUSY if it's a
1679                          * command needing it or DATA_XFER if there is data.
1680                          */
1681                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1682                         if (!atmci_test_and_clear_pending(host,
1683                                                 EVENT_CMD_RDY))
1684                                 break;
1685 
1686                         dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1687                         host->cmd = NULL;
1688                         atmci_set_completed(host, EVENT_CMD_RDY);
1689                         atmci_command_complete(host, mrq->cmd);
1690                         if (mrq->data) {
1691                                 dev_dbg(&host->pdev->dev,
1692                                         "command with data transfer");
1693                                 /*
1694                                  * If there is a command error don't start
1695                                  * data transfer.
1696                                  */
1697                                 if (mrq->cmd->error) {
1698                                         host->stop_transfer(host);
1699                                         host->data = NULL;
1700                                         atmci_writel(host, ATMCI_IDR,
1701                                                      ATMCI_TXRDY | ATMCI_RXRDY
1702                                                      | ATMCI_DATA_ERROR_FLAGS);
1703                                         state = STATE_END_REQUEST;
1704                                 } else
1705                                         state = STATE_DATA_XFER;
1706                         } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1707                                 dev_dbg(&host->pdev->dev,
1708                                         "command response need waiting notbusy");
1709                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1710                                 state = STATE_WAITING_NOTBUSY;
1711                         } else
1712                                 state = STATE_END_REQUEST;
1713 
1714                         break;
1715 
1716                 case STATE_DATA_XFER:
1717                         if (atmci_test_and_clear_pending(host,
1718                                                 EVENT_DATA_ERROR)) {
1719                                 dev_dbg(&host->pdev->dev, "set completed data error\n");
1720                                 atmci_set_completed(host, EVENT_DATA_ERROR);
1721                                 state = STATE_END_REQUEST;
1722                                 break;
1723                         }
1724 
1725                         /*
1726                          * A data transfer is in progress. The event expected
1727                          * to move to the next state depends of data transfer
1728                          * type (PDC or DMA). Once transfer done we can move
1729                          * to the next step which is WAITING_NOTBUSY in write
1730                          * case and directly SENDING_STOP in read case.
1731                          */
1732                         dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1733                         if (!atmci_test_and_clear_pending(host,
1734                                                 EVENT_XFER_COMPLETE))
1735                                 break;
1736 
1737                         dev_dbg(&host->pdev->dev,
1738                                 "(%s) set completed xfer complete\n",
1739                                 __func__);
1740                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1741 
1742                         if (host->caps.need_notbusy_for_read_ops ||
1743                            (host->data->flags & MMC_DATA_WRITE)) {
1744                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1745                                 state = STATE_WAITING_NOTBUSY;
1746                         } else if (host->mrq->stop) {
1747                                 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1748                                 atmci_send_stop_cmd(host, data);
1749                                 state = STATE_SENDING_STOP;
1750                         } else {
1751                                 host->data = NULL;
1752                                 data->bytes_xfered = data->blocks * data->blksz;
1753                                 data->error = 0;
1754                                 state = STATE_END_REQUEST;
1755                         }
1756                         break;
1757 
1758                 case STATE_WAITING_NOTBUSY:
1759                         /*
1760                          * We can be in the state for two reasons: a command
1761                          * requiring waiting not busy signal (stop command
1762                          * included) or a write operation. In the latest case,
1763                          * we need to send a stop command.
1764                          */
1765                         dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1766                         if (!atmci_test_and_clear_pending(host,
1767                                                 EVENT_NOTBUSY))
1768                                 break;
1769 
1770                         dev_dbg(&host->pdev->dev, "set completed not busy\n");
1771                         atmci_set_completed(host, EVENT_NOTBUSY);
1772 
1773                         if (host->data) {
1774                                 /*
1775                                  * For some commands such as CMD53, even if
1776                                  * there is data transfer, there is no stop
1777                                  * command to send.
1778                                  */
1779                                 if (host->mrq->stop) {
1780                                         atmci_writel(host, ATMCI_IER,
1781                                                      ATMCI_CMDRDY);
1782                                         atmci_send_stop_cmd(host, data);
1783                                         state = STATE_SENDING_STOP;
1784                                 } else {
1785                                         host->data = NULL;
1786                                         data->bytes_xfered = data->blocks
1787                                                              * data->blksz;
1788                                         data->error = 0;
1789                                         state = STATE_END_REQUEST;
1790                                 }
1791                         } else
1792                                 state = STATE_END_REQUEST;
1793                         break;
1794 
1795                 case STATE_SENDING_STOP:
1796                         /*
1797                          * In this state, it is important to set host->data to
1798                          * NULL (which is tested in the waiting notbusy state)
1799                          * in order to go to the end request state instead of
1800                          * sending stop again.
1801                          */
1802                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1803                         if (!atmci_test_and_clear_pending(host,
1804                                                 EVENT_CMD_RDY))
1805                                 break;
1806 
1807                         dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1808                         host->cmd = NULL;
1809                         data->bytes_xfered = data->blocks * data->blksz;
1810                         data->error = 0;
1811                         atmci_command_complete(host, mrq->stop);
1812                         if (mrq->stop->error) {
1813                                 host->stop_transfer(host);
1814                                 atmci_writel(host, ATMCI_IDR,
1815                                              ATMCI_TXRDY | ATMCI_RXRDY
1816                                              | ATMCI_DATA_ERROR_FLAGS);
1817                                 state = STATE_END_REQUEST;
1818                         } else {
1819                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1820                                 state = STATE_WAITING_NOTBUSY;
1821                         }
1822                         host->data = NULL;
1823                         break;
1824 
1825                 case STATE_END_REQUEST:
1826                         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1827                                            | ATMCI_DATA_ERROR_FLAGS);
1828                         status = host->data_status;
1829                         if (unlikely(status)) {
1830                                 host->stop_transfer(host);
1831                                 host->data = NULL;
1832                                 if (data) {
1833                                         if (status & ATMCI_DTOE) {
1834                                                 data->error = -ETIMEDOUT;
1835                                         } else if (status & ATMCI_DCRCE) {
1836                                                 data->error = -EILSEQ;
1837                                         } else {
1838                                                 data->error = -EIO;
1839                                         }
1840                                 }
1841                         }
1842 
1843                         atmci_request_end(host, host->mrq);
1844                         state = STATE_IDLE;
1845                         break;
1846                 }
1847         } while (state != prev_state);
1848 
1849         host->state = state;
1850 
1851         spin_unlock(&host->lock);
1852 }
1853 
1854 static void atmci_read_data_pio(struct atmel_mci *host)
1855 {
1856         struct scatterlist      *sg = host->sg;
1857         void                    *buf = sg_virt(sg);
1858         unsigned int            offset = host->pio_offset;
1859         struct mmc_data         *data = host->data;
1860         u32                     value;
1861         u32                     status;
1862         unsigned int            nbytes = 0;
1863 
1864         do {
1865                 value = atmci_readl(host, ATMCI_RDR);
1866                 if (likely(offset + 4 <= sg->length)) {
1867                         put_unaligned(value, (u32 *)(buf + offset));
1868 
1869                         offset += 4;
1870                         nbytes += 4;
1871 
1872                         if (offset == sg->length) {
1873                                 flush_dcache_page(sg_page(sg));
1874                                 host->sg = sg = sg_next(sg);
1875                                 host->sg_len--;
1876                                 if (!sg || !host->sg_len)
1877                                         goto done;
1878 
1879                                 offset = 0;
1880                                 buf = sg_virt(sg);
1881                         }
1882                 } else {
1883                         unsigned int remaining = sg->length - offset;
1884                         memcpy(buf + offset, &value, remaining);
1885                         nbytes += remaining;
1886 
1887                         flush_dcache_page(sg_page(sg));
1888                         host->sg = sg = sg_next(sg);
1889                         host->sg_len--;
1890                         if (!sg || !host->sg_len)
1891                                 goto done;
1892 
1893                         offset = 4 - remaining;
1894                         buf = sg_virt(sg);
1895                         memcpy(buf, (u8 *)&value + remaining, offset);
1896                         nbytes += offset;
1897                 }
1898 
1899                 status = atmci_readl(host, ATMCI_SR);
1900                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1901                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1902                                                 | ATMCI_DATA_ERROR_FLAGS));
1903                         host->data_status = status;
1904                         data->bytes_xfered += nbytes;
1905                         return;
1906                 }
1907         } while (status & ATMCI_RXRDY);
1908 
1909         host->pio_offset = offset;
1910         data->bytes_xfered += nbytes;
1911 
1912         return;
1913 
1914 done:
1915         atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1916         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1917         data->bytes_xfered += nbytes;
1918         smp_wmb();
1919         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1920 }
1921 
1922 static void atmci_write_data_pio(struct atmel_mci *host)
1923 {
1924         struct scatterlist      *sg = host->sg;
1925         void                    *buf = sg_virt(sg);
1926         unsigned int            offset = host->pio_offset;
1927         struct mmc_data         *data = host->data;
1928         u32                     value;
1929         u32                     status;
1930         unsigned int            nbytes = 0;
1931 
1932         do {
1933                 if (likely(offset + 4 <= sg->length)) {
1934                         value = get_unaligned((u32 *)(buf + offset));
1935                         atmci_writel(host, ATMCI_TDR, value);
1936 
1937                         offset += 4;
1938                         nbytes += 4;
1939                         if (offset == sg->length) {
1940                                 host->sg = sg = sg_next(sg);
1941                                 host->sg_len--;
1942                                 if (!sg || !host->sg_len)
1943                                         goto done;
1944 
1945                                 offset = 0;
1946                                 buf = sg_virt(sg);
1947                         }
1948                 } else {
1949                         unsigned int remaining = sg->length - offset;
1950 
1951                         value = 0;
1952                         memcpy(&value, buf + offset, remaining);
1953                         nbytes += remaining;
1954 
1955                         host->sg = sg = sg_next(sg);
1956                         host->sg_len--;
1957                         if (!sg || !host->sg_len) {
1958                                 atmci_writel(host, ATMCI_TDR, value);
1959                                 goto done;
1960                         }
1961 
1962                         offset = 4 - remaining;
1963                         buf = sg_virt(sg);
1964                         memcpy((u8 *)&value + remaining, buf, offset);
1965                         atmci_writel(host, ATMCI_TDR, value);
1966                         nbytes += offset;
1967                 }
1968 
1969                 status = atmci_readl(host, ATMCI_SR);
1970                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1971                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1972                                                 | ATMCI_DATA_ERROR_FLAGS));
1973                         host->data_status = status;
1974                         data->bytes_xfered += nbytes;
1975                         return;
1976                 }
1977         } while (status & ATMCI_TXRDY);
1978 
1979         host->pio_offset = offset;
1980         data->bytes_xfered += nbytes;
1981 
1982         return;
1983 
1984 done:
1985         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1986         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1987         data->bytes_xfered += nbytes;
1988         smp_wmb();
1989         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1990 }
1991 
1992 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1993 {
1994         int     i;
1995 
1996         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1997                 struct atmel_mci_slot *slot = host->slot[i];
1998                 if (slot && (status & slot->sdio_irq)) {
1999                         mmc_signal_sdio_irq(slot->mmc);
2000                 }
2001         }
2002 }
2003 
2004 
2005 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
2006 {
2007         struct atmel_mci        *host = dev_id;
2008         u32                     status, mask, pending;
2009         unsigned int            pass_count = 0;
2010 
2011         do {
2012                 status = atmci_readl(host, ATMCI_SR);
2013                 mask = atmci_readl(host, ATMCI_IMR);
2014                 pending = status & mask;
2015                 if (!pending)
2016                         break;
2017 
2018                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2019                         dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2020                         atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2021                                         | ATMCI_RXRDY | ATMCI_TXRDY
2022                                         | ATMCI_ENDRX | ATMCI_ENDTX
2023                                         | ATMCI_RXBUFF | ATMCI_TXBUFE);
2024 
2025                         host->data_status = status;
2026                         dev_dbg(&host->pdev->dev, "set pending data error\n");
2027                         smp_wmb();
2028                         atmci_set_pending(host, EVENT_DATA_ERROR);
2029                         tasklet_schedule(&host->tasklet);
2030                 }
2031 
2032                 if (pending & ATMCI_TXBUFE) {
2033                         dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2034                         atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2035                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2036                         /*
2037                          * We can receive this interruption before having configured
2038                          * the second pdc buffer, so we need to reconfigure first and
2039                          * second buffers again
2040                          */
2041                         if (host->data_size) {
2042                                 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2043                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2044                                 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2045                         } else {
2046                                 atmci_pdc_complete(host);
2047                         }
2048                 } else if (pending & ATMCI_ENDTX) {
2049                         dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2050                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2051 
2052                         if (host->data_size) {
2053                                 atmci_pdc_set_single_buf(host,
2054                                                 XFER_TRANSMIT, PDC_SECOND_BUF);
2055                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2056                         }
2057                 }
2058 
2059                 if (pending & ATMCI_RXBUFF) {
2060                         dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2061                         atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2062                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2063                         /*
2064                          * We can receive this interruption before having configured
2065                          * the second pdc buffer, so we need to reconfigure first and
2066                          * second buffers again
2067                          */
2068                         if (host->data_size) {
2069                                 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2070                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2071                                 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2072                         } else {
2073                                 atmci_pdc_complete(host);
2074                         }
2075                 } else if (pending & ATMCI_ENDRX) {
2076                         dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2077                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2078 
2079                         if (host->data_size) {
2080                                 atmci_pdc_set_single_buf(host,
2081                                                 XFER_RECEIVE, PDC_SECOND_BUF);
2082                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2083                         }
2084                 }
2085 
2086                 /*
2087                  * First mci IPs, so mainly the ones having pdc, have some
2088                  * issues with the notbusy signal. You can't get it after
2089                  * data transmission if you have not sent a stop command.
2090                  * The appropriate workaround is to use the BLKE signal.
2091                  */
2092                 if (pending & ATMCI_BLKE) {
2093                         dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2094                         atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2095                         smp_wmb();
2096                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2097                         atmci_set_pending(host, EVENT_NOTBUSY);
2098                         tasklet_schedule(&host->tasklet);
2099                 }
2100 
2101                 if (pending & ATMCI_NOTBUSY) {
2102                         dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2103                         atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2104                         smp_wmb();
2105                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2106                         atmci_set_pending(host, EVENT_NOTBUSY);
2107                         tasklet_schedule(&host->tasklet);
2108                 }
2109 
2110                 if (pending & ATMCI_RXRDY)
2111                         atmci_read_data_pio(host);
2112                 if (pending & ATMCI_TXRDY)
2113                         atmci_write_data_pio(host);
2114 
2115                 if (pending & ATMCI_CMDRDY) {
2116                         dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2117                         atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2118                         host->cmd_status = status;
2119                         smp_wmb();
2120                         dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2121                         atmci_set_pending(host, EVENT_CMD_RDY);
2122                         tasklet_schedule(&host->tasklet);
2123                 }
2124 
2125                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2126                         atmci_sdio_interrupt(host, status);
2127 
2128         } while (pass_count++ < 5);
2129 
2130         return pass_count ? IRQ_HANDLED : IRQ_NONE;
2131 }
2132 
2133 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2134 {
2135         struct atmel_mci_slot   *slot = dev_id;
2136 
2137         /*
2138          * Disable interrupts until the pin has stabilized and check
2139          * the state then. Use mod_timer() since we may be in the
2140          * middle of the timer routine when this interrupt triggers.
2141          */
2142         disable_irq_nosync(irq);
2143         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2144 
2145         return IRQ_HANDLED;
2146 }
2147 
2148 static int atmci_init_slot(struct atmel_mci *host,
2149                 struct mci_slot_pdata *slot_data, unsigned int id,
2150                 u32 sdc_reg, u32 sdio_irq)
2151 {
2152         struct mmc_host                 *mmc;
2153         struct atmel_mci_slot           *slot;
2154 
2155         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2156         if (!mmc)
2157                 return -ENOMEM;
2158 
2159         slot = mmc_priv(mmc);
2160         slot->mmc = mmc;
2161         slot->host = host;
2162         slot->detect_pin = slot_data->detect_pin;
2163         slot->wp_pin = slot_data->wp_pin;
2164         slot->detect_is_active_high = slot_data->detect_is_active_high;
2165         slot->sdc_reg = sdc_reg;
2166         slot->sdio_irq = sdio_irq;
2167 
2168         dev_dbg(&mmc->class_dev,
2169                 "slot[%u]: bus_width=%u, detect_pin=%d, "
2170                 "detect_is_active_high=%s, wp_pin=%d\n",
2171                 id, slot_data->bus_width, slot_data->detect_pin,
2172                 slot_data->detect_is_active_high ? "true" : "false",
2173                 slot_data->wp_pin);
2174 
2175         mmc->ops = &atmci_ops;
2176         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2177         mmc->f_max = host->bus_hz / 2;
2178         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
2179         if (sdio_irq)
2180                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2181         if (host->caps.has_highspeed)
2182                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2183         /*
2184          * Without the read/write proof capability, it is strongly suggested to
2185          * use only one bit for data to prevent fifo underruns and overruns
2186          * which will corrupt data.
2187          */
2188         if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2189                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2190 
2191         if (atmci_get_version(host) < 0x200) {
2192                 mmc->max_segs = 256;
2193                 mmc->max_blk_size = 4095;
2194                 mmc->max_blk_count = 256;
2195                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2196                 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2197         } else {
2198                 mmc->max_segs = 64;
2199                 mmc->max_req_size = 32768 * 512;
2200                 mmc->max_blk_size = 32768;
2201                 mmc->max_blk_count = 512;
2202         }
2203 
2204         /* Assume card is present initially */
2205         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2206         if (gpio_is_valid(slot->detect_pin)) {
2207                 if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
2208                                       "mmc_detect")) {
2209                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
2210                         slot->detect_pin = -EBUSY;
2211                 } else if (gpio_get_value(slot->detect_pin) ^
2212                                 slot->detect_is_active_high) {
2213                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2214                 }
2215         }
2216 
2217         if (!gpio_is_valid(slot->detect_pin)) {
2218                 if (slot_data->non_removable)
2219                         mmc->caps |= MMC_CAP_NONREMOVABLE;
2220                 else
2221                         mmc->caps |= MMC_CAP_NEEDS_POLL;
2222         }
2223 
2224         if (gpio_is_valid(slot->wp_pin)) {
2225                 if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
2226                                       "mmc_wp")) {
2227                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
2228                         slot->wp_pin = -EBUSY;
2229                 }
2230         }
2231 
2232         host->slot[id] = slot;
2233         mmc_regulator_get_supply(mmc);
2234         mmc_add_host(mmc);
2235 
2236         if (gpio_is_valid(slot->detect_pin)) {
2237                 int ret;
2238 
2239                 setup_timer(&slot->detect_timer, atmci_detect_change,
2240                                 (unsigned long)slot);
2241 
2242                 ret = request_irq(gpio_to_irq(slot->detect_pin),
2243                                 atmci_detect_interrupt,
2244                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2245                                 "mmc-detect", slot);
2246                 if (ret) {
2247                         dev_dbg(&mmc->class_dev,
2248                                 "could not request IRQ %d for detect pin\n",
2249                                 gpio_to_irq(slot->detect_pin));
2250                         slot->detect_pin = -EBUSY;
2251                 }
2252         }
2253 
2254         atmci_init_debugfs(slot);
2255 
2256         return 0;
2257 }
2258 
2259 static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
2260                 unsigned int id)
2261 {
2262         /* Debugfs stuff is cleaned up by mmc core */
2263 
2264         set_bit(ATMCI_SHUTDOWN, &slot->flags);
2265         smp_wmb();
2266 
2267         mmc_remove_host(slot->mmc);
2268 
2269         if (gpio_is_valid(slot->detect_pin)) {
2270                 int pin = slot->detect_pin;
2271 
2272                 free_irq(gpio_to_irq(pin), slot);
2273                 del_timer_sync(&slot->detect_timer);
2274         }
2275 
2276         slot->host->slot[id] = NULL;
2277         mmc_free_host(slot->mmc);
2278 }
2279 
2280 static int atmci_configure_dma(struct atmel_mci *host)
2281 {
2282         host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev,
2283                                                         "rxtx");
2284         if (IS_ERR(host->dma.chan))
2285                 return PTR_ERR(host->dma.chan);
2286 
2287         dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
2288                  dma_chan_name(host->dma.chan));
2289 
2290         host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2291         host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2292         host->dma_conf.src_maxburst = 1;
2293         host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2294         host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2295         host->dma_conf.dst_maxburst = 1;
2296         host->dma_conf.device_fc = false;
2297 
2298         return 0;
2299 }
2300 
2301 /*
2302  * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2303  * HSMCI provides DMA support and a new config register but no more supports
2304  * PDC.
2305  */
2306 static void atmci_get_cap(struct atmel_mci *host)
2307 {
2308         unsigned int version;
2309 
2310         version = atmci_get_version(host);
2311         dev_info(&host->pdev->dev,
2312                         "version: 0x%x\n", version);
2313 
2314         host->caps.has_dma_conf_reg = 0;
2315         host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2316         host->caps.has_cfg_reg = 0;
2317         host->caps.has_cstor_reg = 0;
2318         host->caps.has_highspeed = 0;
2319         host->caps.has_rwproof = 0;
2320         host->caps.has_odd_clk_div = 0;
2321         host->caps.has_bad_data_ordering = 1;
2322         host->caps.need_reset_after_xfer = 1;
2323         host->caps.need_blksz_mul_4 = 1;
2324         host->caps.need_notbusy_for_read_ops = 0;
2325 
2326         /* keep only major version number */
2327         switch (version & 0xf00) {
2328         case 0x600:
2329         case 0x500:
2330                 host->caps.has_odd_clk_div = 1;
2331         case 0x400:
2332         case 0x300:
2333                 host->caps.has_dma_conf_reg = 1;
2334                 host->caps.has_pdc = 0;
2335                 host->caps.has_cfg_reg = 1;
2336                 host->caps.has_cstor_reg = 1;
2337                 host->caps.has_highspeed = 1;
2338         case 0x200:
2339                 host->caps.has_rwproof = 1;
2340                 host->caps.need_blksz_mul_4 = 0;
2341                 host->caps.need_notbusy_for_read_ops = 1;
2342         case 0x100:
2343                 host->caps.has_bad_data_ordering = 0;
2344                 host->caps.need_reset_after_xfer = 0;
2345         case 0x0:
2346                 break;
2347         default:
2348                 host->caps.has_pdc = 0;
2349                 dev_warn(&host->pdev->dev,
2350                                 "Unmanaged mci version, set minimum capabilities\n");
2351                 break;
2352         }
2353 }
2354 
2355 static int atmci_probe(struct platform_device *pdev)
2356 {
2357         struct mci_platform_data        *pdata;
2358         struct atmel_mci                *host;
2359         struct resource                 *regs;
2360         unsigned int                    nr_slots;
2361         int                             irq;
2362         int                             ret, i;
2363 
2364         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2365         if (!regs)
2366                 return -ENXIO;
2367         pdata = pdev->dev.platform_data;
2368         if (!pdata) {
2369                 pdata = atmci_of_init(pdev);
2370                 if (IS_ERR(pdata)) {
2371                         dev_err(&pdev->dev, "platform data not available\n");
2372                         return PTR_ERR(pdata);
2373                 }
2374         }
2375 
2376         irq = platform_get_irq(pdev, 0);
2377         if (irq < 0)
2378                 return irq;
2379 
2380         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2381         if (!host)
2382                 return -ENOMEM;
2383 
2384         host->pdev = pdev;
2385         spin_lock_init(&host->lock);
2386         INIT_LIST_HEAD(&host->queue);
2387 
2388         host->mck = devm_clk_get(&pdev->dev, "mci_clk");
2389         if (IS_ERR(host->mck))
2390                 return PTR_ERR(host->mck);
2391 
2392         host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2393         if (!host->regs)
2394                 return -ENOMEM;
2395 
2396         ret = clk_prepare_enable(host->mck);
2397         if (ret)
2398                 return ret;
2399 
2400         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2401         host->bus_hz = clk_get_rate(host->mck);
2402 
2403         host->mapbase = regs->start;
2404 
2405         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2406 
2407         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2408         if (ret) {
2409                 clk_disable_unprepare(host->mck);
2410                 return ret;
2411         }
2412 
2413         /* Get MCI capabilities and set operations according to it */
2414         atmci_get_cap(host);
2415         ret = atmci_configure_dma(host);
2416         if (ret == -EPROBE_DEFER)
2417                 goto err_dma_probe_defer;
2418         if (ret == 0) {
2419                 host->prepare_data = &atmci_prepare_data_dma;
2420                 host->submit_data = &atmci_submit_data_dma;
2421                 host->stop_transfer = &atmci_stop_transfer_dma;
2422         } else if (host->caps.has_pdc) {
2423                 dev_info(&pdev->dev, "using PDC\n");
2424                 host->prepare_data = &atmci_prepare_data_pdc;
2425                 host->submit_data = &atmci_submit_data_pdc;
2426                 host->stop_transfer = &atmci_stop_transfer_pdc;
2427         } else {
2428                 dev_info(&pdev->dev, "using PIO\n");
2429                 host->prepare_data = &atmci_prepare_data;
2430                 host->submit_data = &atmci_submit_data;
2431                 host->stop_transfer = &atmci_stop_transfer;
2432         }
2433 
2434         platform_set_drvdata(pdev, host);
2435 
2436         setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2437 
2438         pm_runtime_get_noresume(&pdev->dev);
2439         pm_runtime_set_active(&pdev->dev);
2440         pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_DELAY);
2441         pm_runtime_use_autosuspend(&pdev->dev);
2442         pm_runtime_enable(&pdev->dev);
2443 
2444         /* We need at least one slot to succeed */
2445         nr_slots = 0;
2446         ret = -ENODEV;
2447         if (pdata->slot[0].bus_width) {
2448                 ret = atmci_init_slot(host, &pdata->slot[0],
2449                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2450                 if (!ret) {
2451                         nr_slots++;
2452                         host->buf_size = host->slot[0]->mmc->max_req_size;
2453                 }
2454         }
2455         if (pdata->slot[1].bus_width) {
2456                 ret = atmci_init_slot(host, &pdata->slot[1],
2457                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2458                 if (!ret) {
2459                         nr_slots++;
2460                         if (host->slot[1]->mmc->max_req_size > host->buf_size)
2461                                 host->buf_size =
2462                                         host->slot[1]->mmc->max_req_size;
2463                 }
2464         }
2465 
2466         if (!nr_slots) {
2467                 dev_err(&pdev->dev, "init failed: no slot defined\n");
2468                 goto err_init_slot;
2469         }
2470 
2471         if (!host->caps.has_rwproof) {
2472                 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2473                                                   &host->buf_phys_addr,
2474                                                   GFP_KERNEL);
2475                 if (!host->buffer) {
2476                         ret = -ENOMEM;
2477                         dev_err(&pdev->dev, "buffer allocation failed\n");
2478                         goto err_dma_alloc;
2479                 }
2480         }
2481 
2482         dev_info(&pdev->dev,
2483                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2484                         host->mapbase, irq, nr_slots);
2485 
2486         pm_runtime_mark_last_busy(&host->pdev->dev);
2487         pm_runtime_put_autosuspend(&pdev->dev);
2488 
2489         return 0;
2490 
2491 err_dma_alloc:
2492         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2493                 if (host->slot[i])
2494                         atmci_cleanup_slot(host->slot[i], i);
2495         }
2496 err_init_slot:
2497         clk_disable_unprepare(host->mck);
2498 
2499         pm_runtime_disable(&pdev->dev);
2500         pm_runtime_put_noidle(&pdev->dev);
2501 
2502         del_timer_sync(&host->timer);
2503         if (!IS_ERR(host->dma.chan))
2504                 dma_release_channel(host->dma.chan);
2505 err_dma_probe_defer:
2506         free_irq(irq, host);
2507         return ret;
2508 }
2509 
2510 static int atmci_remove(struct platform_device *pdev)
2511 {
2512         struct atmel_mci        *host = platform_get_drvdata(pdev);
2513         unsigned int            i;
2514 
2515         pm_runtime_get_sync(&pdev->dev);
2516 
2517         if (host->buffer)
2518                 dma_free_coherent(&pdev->dev, host->buf_size,
2519                                   host->buffer, host->buf_phys_addr);
2520 
2521         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2522                 if (host->slot[i])
2523                         atmci_cleanup_slot(host->slot[i], i);
2524         }
2525 
2526         atmci_writel(host, ATMCI_IDR, ~0UL);
2527         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2528         atmci_readl(host, ATMCI_SR);
2529 
2530         del_timer_sync(&host->timer);
2531         if (!IS_ERR(host->dma.chan))
2532                 dma_release_channel(host->dma.chan);
2533 
2534         free_irq(platform_get_irq(pdev, 0), host);
2535 
2536         clk_disable_unprepare(host->mck);
2537 
2538         pm_runtime_disable(&pdev->dev);
2539         pm_runtime_put_noidle(&pdev->dev);
2540 
2541         return 0;
2542 }
2543 
2544 #ifdef CONFIG_PM
2545 static int atmci_runtime_suspend(struct device *dev)
2546 {
2547         struct atmel_mci *host = dev_get_drvdata(dev);
2548 
2549         clk_disable_unprepare(host->mck);
2550 
2551         pinctrl_pm_select_sleep_state(dev);
2552 
2553         return 0;
2554 }
2555 
2556 static int atmci_runtime_resume(struct device *dev)
2557 {
2558         struct atmel_mci *host = dev_get_drvdata(dev);
2559 
2560         pinctrl_pm_select_default_state(dev);
2561 
2562         return clk_prepare_enable(host->mck);
2563 }
2564 #endif
2565 
2566 static const struct dev_pm_ops atmci_dev_pm_ops = {
2567         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2568                                 pm_runtime_force_resume)
2569         SET_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
2570 };
2571 
2572 static struct platform_driver atmci_driver = {
2573         .probe          = atmci_probe,
2574         .remove         = atmci_remove,
2575         .driver         = {
2576                 .name           = "atmel_mci",
2577                 .of_match_table = of_match_ptr(atmci_dt_ids),
2578                 .pm             = &atmci_dev_pm_ops,
2579         },
2580 };
2581 module_platform_driver(atmci_driver);
2582 
2583 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2584 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2585 MODULE_LICENSE("GPL v2");
2586 

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