Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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

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