9819dc09ce08d24f7bd2924fd35d786cc013b0ac
[linux-2.6.git] / 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/platform_device.h>
23 #include <linux/scatterlist.h>
24 #include <linux/seq_file.h>
25 #include <linux/slab.h>
26 #include <linux/stat.h>
27 #include <linux/types.h>
28
29 #include <linux/mmc/host.h>
30 #include <linux/mmc/sdio.h>
31
32 #include <mach/atmel-mci.h>
33 #include <linux/atmel-mci.h>
34 #include <linux/atmel_pdc.h>
35
36 #include <asm/io.h>
37 #include <asm/unaligned.h>
38
39 #include <mach/cpu.h>
40 #include <mach/board.h>
41
42 #include "atmel-mci-regs.h"
43
44 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
45 #define ATMCI_DMA_THRESHOLD     16
46
47 enum {
48         EVENT_CMD_COMPLETE = 0,
49         EVENT_XFER_COMPLETE,
50         EVENT_DATA_COMPLETE,
51         EVENT_DATA_ERROR,
52 };
53
54 enum atmel_mci_state {
55         STATE_IDLE = 0,
56         STATE_SENDING_CMD,
57         STATE_SENDING_DATA,
58         STATE_DATA_BUSY,
59         STATE_SENDING_STOP,
60         STATE_DATA_ERROR,
61 };
62
63 enum atmci_xfer_dir {
64         XFER_RECEIVE = 0,
65         XFER_TRANSMIT,
66 };
67
68 enum atmci_pdc_buf {
69         PDC_FIRST_BUF = 0,
70         PDC_SECOND_BUF,
71 };
72
73 struct atmel_mci_caps {
74         bool    has_dma;
75         bool    has_pdc;
76         bool    has_cfg_reg;
77         bool    has_cstor_reg;
78         bool    has_highspeed;
79         bool    has_rwproof;
80 };
81
82 struct atmel_mci_dma {
83         struct dma_chan                 *chan;
84         struct dma_async_tx_descriptor  *data_desc;
85 };
86
87 /**
88  * struct atmel_mci - MMC controller state shared between all slots
89  * @lock: Spinlock protecting the queue and associated data.
90  * @regs: Pointer to MMIO registers.
91  * @sg: Scatterlist entry currently being processed by PIO or PDC code.
92  * @pio_offset: Offset into the current scatterlist entry.
93  * @cur_slot: The slot which is currently using the controller.
94  * @mrq: The request currently being processed on @cur_slot,
95  *      or NULL if the controller is idle.
96  * @cmd: The command currently being sent to the card, or NULL.
97  * @data: The data currently being transferred, or NULL if no data
98  *      transfer is in progress.
99  * @data_size: just data->blocks * data->blksz.
100  * @dma: DMA client state.
101  * @data_chan: DMA channel being used for the current data transfer.
102  * @cmd_status: Snapshot of SR taken upon completion of the current
103  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
104  * @data_status: Snapshot of SR taken upon completion of the current
105  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
106  *      EVENT_DATA_ERROR is pending.
107  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
108  *      to be sent.
109  * @tasklet: Tasklet running the request state machine.
110  * @pending_events: Bitmask of events flagged by the interrupt handler
111  *      to be processed by the tasklet.
112  * @completed_events: Bitmask of events which the state machine has
113  *      processed.
114  * @state: Tasklet state.
115  * @queue: List of slots waiting for access to the controller.
116  * @need_clock_update: Update the clock rate before the next request.
117  * @need_reset: Reset controller before next request.
118  * @mode_reg: Value of the MR register.
119  * @cfg_reg: Value of the CFG register.
120  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
121  *      rate and timeout calculations.
122  * @mapbase: Physical address of the MMIO registers.
123  * @mck: The peripheral bus clock hooked up to the MMC controller.
124  * @pdev: Platform device associated with the MMC controller.
125  * @slot: Slots sharing this MMC controller.
126  * @caps: MCI capabilities depending on MCI version.
127  * @prepare_data: function to setup MCI before data transfer which
128  * depends on MCI capabilities.
129  * @submit_data: function to start data transfer which depends on MCI
130  * capabilities.
131  * @stop_transfer: function to stop data transfer which depends on MCI
132  * capabilities.
133  *
134  * Locking
135  * =======
136  *
137  * @lock is a softirq-safe spinlock protecting @queue as well as
138  * @cur_slot, @mrq and @state. These must always be updated
139  * at the same time while holding @lock.
140  *
141  * @lock also protects mode_reg and need_clock_update since these are
142  * used to synchronize mode register updates with the queue
143  * processing.
144  *
145  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
146  * and must always be written at the same time as the slot is added to
147  * @queue.
148  *
149  * @pending_events and @completed_events are accessed using atomic bit
150  * operations, so they don't need any locking.
151  *
152  * None of the fields touched by the interrupt handler need any
153  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
154  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
155  * interrupts must be disabled and @data_status updated with a
156  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
157  * CMDRDY interrupt must be disabled and @cmd_status updated with a
158  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
159  * bytes_xfered field of @data must be written. This is ensured by
160  * using barriers.
161  */
162 struct atmel_mci {
163         spinlock_t              lock;
164         void __iomem            *regs;
165
166         struct scatterlist      *sg;
167         unsigned int            pio_offset;
168
169         struct atmel_mci_slot   *cur_slot;
170         struct mmc_request      *mrq;
171         struct mmc_command      *cmd;
172         struct mmc_data         *data;
173         unsigned int            data_size;
174
175         struct atmel_mci_dma    dma;
176         struct dma_chan         *data_chan;
177         struct dma_slave_config dma_conf;
178
179         u32                     cmd_status;
180         u32                     data_status;
181         u32                     stop_cmdr;
182
183         struct tasklet_struct   tasklet;
184         unsigned long           pending_events;
185         unsigned long           completed_events;
186         enum atmel_mci_state    state;
187         struct list_head        queue;
188
189         bool                    need_clock_update;
190         bool                    need_reset;
191         u32                     mode_reg;
192         u32                     cfg_reg;
193         unsigned long           bus_hz;
194         unsigned long           mapbase;
195         struct clk              *mck;
196         struct platform_device  *pdev;
197
198         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
199
200         struct atmel_mci_caps   caps;
201
202         u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
203         void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
204         void (*stop_transfer)(struct atmel_mci *host);
205 };
206
207 /**
208  * struct atmel_mci_slot - MMC slot state
209  * @mmc: The mmc_host representing this slot.
210  * @host: The MMC controller this slot is using.
211  * @sdc_reg: Value of SDCR to be written before using this slot.
212  * @sdio_irq: SDIO irq mask for this slot.
213  * @mrq: mmc_request currently being processed or waiting to be
214  *      processed, or NULL when the slot is idle.
215  * @queue_node: List node for placing this node in the @queue list of
216  *      &struct atmel_mci.
217  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
218  * @flags: Random state bits associated with the slot.
219  * @detect_pin: GPIO pin used for card detection, or negative if not
220  *      available.
221  * @wp_pin: GPIO pin used for card write protect sending, or negative
222  *      if not available.
223  * @detect_is_active_high: The state of the detect pin when it is active.
224  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
225  */
226 struct atmel_mci_slot {
227         struct mmc_host         *mmc;
228         struct atmel_mci        *host;
229
230         u32                     sdc_reg;
231         u32                     sdio_irq;
232
233         struct mmc_request      *mrq;
234         struct list_head        queue_node;
235
236         unsigned int            clock;
237         unsigned long           flags;
238 #define ATMCI_CARD_PRESENT      0
239 #define ATMCI_CARD_NEED_INIT    1
240 #define ATMCI_SHUTDOWN          2
241 #define ATMCI_SUSPENDED         3
242
243         int                     detect_pin;
244         int                     wp_pin;
245         bool                    detect_is_active_high;
246
247         struct timer_list       detect_timer;
248 };
249
250 #define atmci_test_and_clear_pending(host, event)               \
251         test_and_clear_bit(event, &host->pending_events)
252 #define atmci_set_completed(host, event)                        \
253         set_bit(event, &host->completed_events)
254 #define atmci_set_pending(host, event)                          \
255         set_bit(event, &host->pending_events)
256
257 /*
258  * The debugfs stuff below is mostly optimized away when
259  * CONFIG_DEBUG_FS is not set.
260  */
261 static int atmci_req_show(struct seq_file *s, void *v)
262 {
263         struct atmel_mci_slot   *slot = s->private;
264         struct mmc_request      *mrq;
265         struct mmc_command      *cmd;
266         struct mmc_command      *stop;
267         struct mmc_data         *data;
268
269         /* Make sure we get a consistent snapshot */
270         spin_lock_bh(&slot->host->lock);
271         mrq = slot->mrq;
272
273         if (mrq) {
274                 cmd = mrq->cmd;
275                 data = mrq->data;
276                 stop = mrq->stop;
277
278                 if (cmd)
279                         seq_printf(s,
280                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
281                                 cmd->opcode, cmd->arg, cmd->flags,
282                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
283                                 cmd->resp[3], cmd->error);
284                 if (data)
285                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
286                                 data->bytes_xfered, data->blocks,
287                                 data->blksz, data->flags, data->error);
288                 if (stop)
289                         seq_printf(s,
290                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
291                                 stop->opcode, stop->arg, stop->flags,
292                                 stop->resp[0], stop->resp[1], stop->resp[2],
293                                 stop->resp[3], stop->error);
294         }
295
296         spin_unlock_bh(&slot->host->lock);
297
298         return 0;
299 }
300
301 static int atmci_req_open(struct inode *inode, struct file *file)
302 {
303         return single_open(file, atmci_req_show, inode->i_private);
304 }
305
306 static const struct file_operations atmci_req_fops = {
307         .owner          = THIS_MODULE,
308         .open           = atmci_req_open,
309         .read           = seq_read,
310         .llseek         = seq_lseek,
311         .release        = single_release,
312 };
313
314 static void atmci_show_status_reg(struct seq_file *s,
315                 const char *regname, u32 value)
316 {
317         static const char       *sr_bit[] = {
318                 [0]     = "CMDRDY",
319                 [1]     = "RXRDY",
320                 [2]     = "TXRDY",
321                 [3]     = "BLKE",
322                 [4]     = "DTIP",
323                 [5]     = "NOTBUSY",
324                 [6]     = "ENDRX",
325                 [7]     = "ENDTX",
326                 [8]     = "SDIOIRQA",
327                 [9]     = "SDIOIRQB",
328                 [12]    = "SDIOWAIT",
329                 [14]    = "RXBUFF",
330                 [15]    = "TXBUFE",
331                 [16]    = "RINDE",
332                 [17]    = "RDIRE",
333                 [18]    = "RCRCE",
334                 [19]    = "RENDE",
335                 [20]    = "RTOE",
336                 [21]    = "DCRCE",
337                 [22]    = "DTOE",
338                 [23]    = "CSTOE",
339                 [24]    = "BLKOVRE",
340                 [25]    = "DMADONE",
341                 [26]    = "FIFOEMPTY",
342                 [27]    = "XFRDONE",
343                 [30]    = "OVRE",
344                 [31]    = "UNRE",
345         };
346         unsigned int            i;
347
348         seq_printf(s, "%s:\t0x%08x", regname, value);
349         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
350                 if (value & (1 << i)) {
351                         if (sr_bit[i])
352                                 seq_printf(s, " %s", sr_bit[i]);
353                         else
354                                 seq_puts(s, " UNKNOWN");
355                 }
356         }
357         seq_putc(s, '\n');
358 }
359
360 static int atmci_regs_show(struct seq_file *s, void *v)
361 {
362         struct atmel_mci        *host = s->private;
363         u32                     *buf;
364
365         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
366         if (!buf)
367                 return -ENOMEM;
368
369         /*
370          * Grab a more or less consistent snapshot. Note that we're
371          * not disabling interrupts, so IMR and SR may not be
372          * consistent.
373          */
374         spin_lock_bh(&host->lock);
375         clk_enable(host->mck);
376         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
377         clk_disable(host->mck);
378         spin_unlock_bh(&host->lock);
379
380         seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n",
381                         buf[ATMCI_MR / 4],
382                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
383                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "",
384                         buf[ATMCI_MR / 4] & 0xff);
385         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
386         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
387         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
388         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
389                         buf[ATMCI_BLKR / 4],
390                         buf[ATMCI_BLKR / 4] & 0xffff,
391                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
392         if (host->caps.has_cstor_reg)
393                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
394
395         /* Don't read RSPR and RDR; it will consume the data there */
396
397         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
398         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
399
400         if (host->caps.has_dma) {
401                 u32 val;
402
403                 val = buf[ATMCI_DMA / 4];
404                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
405                                 val, val & 3,
406                                 ((val >> 4) & 3) ?
407                                         1 << (((val >> 4) & 3) + 1) : 1,
408                                 val & ATMCI_DMAEN ? " DMAEN" : "");
409         }
410         if (host->caps.has_cfg_reg) {
411                 u32 val;
412
413                 val = buf[ATMCI_CFG / 4];
414                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
415                                 val,
416                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
417                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
418                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
419                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
420         }
421
422         kfree(buf);
423
424         return 0;
425 }
426
427 static int atmci_regs_open(struct inode *inode, struct file *file)
428 {
429         return single_open(file, atmci_regs_show, inode->i_private);
430 }
431
432 static const struct file_operations atmci_regs_fops = {
433         .owner          = THIS_MODULE,
434         .open           = atmci_regs_open,
435         .read           = seq_read,
436         .llseek         = seq_lseek,
437         .release        = single_release,
438 };
439
440 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
441 {
442         struct mmc_host         *mmc = slot->mmc;
443         struct atmel_mci        *host = slot->host;
444         struct dentry           *root;
445         struct dentry           *node;
446
447         root = mmc->debugfs_root;
448         if (!root)
449                 return;
450
451         node = debugfs_create_file("regs", S_IRUSR, root, host,
452                         &atmci_regs_fops);
453         if (IS_ERR(node))
454                 return;
455         if (!node)
456                 goto err;
457
458         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
459         if (!node)
460                 goto err;
461
462         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
463         if (!node)
464                 goto err;
465
466         node = debugfs_create_x32("pending_events", S_IRUSR, root,
467                                      (u32 *)&host->pending_events);
468         if (!node)
469                 goto err;
470
471         node = debugfs_create_x32("completed_events", S_IRUSR, root,
472                                      (u32 *)&host->completed_events);
473         if (!node)
474                 goto err;
475
476         return;
477
478 err:
479         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
480 }
481
482 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
483                                         unsigned int ns)
484 {
485         return (ns * (host->bus_hz / 1000000) + 999) / 1000;
486 }
487
488 static void atmci_set_timeout(struct atmel_mci *host,
489                 struct atmel_mci_slot *slot, struct mmc_data *data)
490 {
491         static unsigned dtomul_to_shift[] = {
492                 0, 4, 7, 8, 10, 12, 16, 20
493         };
494         unsigned        timeout;
495         unsigned        dtocyc;
496         unsigned        dtomul;
497
498         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
499                 + data->timeout_clks;
500
501         for (dtomul = 0; dtomul < 8; dtomul++) {
502                 unsigned shift = dtomul_to_shift[dtomul];
503                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
504                 if (dtocyc < 15)
505                         break;
506         }
507
508         if (dtomul >= 8) {
509                 dtomul = 7;
510                 dtocyc = 15;
511         }
512
513         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
514                         dtocyc << dtomul_to_shift[dtomul]);
515         atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
516 }
517
518 /*
519  * Return mask with command flags to be enabled for this command.
520  */
521 static u32 atmci_prepare_command(struct mmc_host *mmc,
522                                  struct mmc_command *cmd)
523 {
524         struct mmc_data *data;
525         u32             cmdr;
526
527         cmd->error = -EINPROGRESS;
528
529         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
530
531         if (cmd->flags & MMC_RSP_PRESENT) {
532                 if (cmd->flags & MMC_RSP_136)
533                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
534                 else
535                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
536         }
537
538         /*
539          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
540          * it's too difficult to determine whether this is an ACMD or
541          * not. Better make it 64.
542          */
543         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
544
545         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
546                 cmdr |= ATMCI_CMDR_OPDCMD;
547
548         data = cmd->data;
549         if (data) {
550                 cmdr |= ATMCI_CMDR_START_XFER;
551
552                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
553                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
554                 } else {
555                         if (data->flags & MMC_DATA_STREAM)
556                                 cmdr |= ATMCI_CMDR_STREAM;
557                         else if (data->blocks > 1)
558                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
559                         else
560                                 cmdr |= ATMCI_CMDR_BLOCK;
561                 }
562
563                 if (data->flags & MMC_DATA_READ)
564                         cmdr |= ATMCI_CMDR_TRDIR_READ;
565         }
566
567         return cmdr;
568 }
569
570 static void atmci_send_command(struct atmel_mci *host,
571                 struct mmc_command *cmd, u32 cmd_flags)
572 {
573         WARN_ON(host->cmd);
574         host->cmd = cmd;
575
576         dev_vdbg(&host->pdev->dev,
577                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
578                         cmd->arg, cmd_flags);
579
580         atmci_writel(host, ATMCI_ARGR, cmd->arg);
581         atmci_writel(host, ATMCI_CMDR, cmd_flags);
582 }
583
584 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
585 {
586         atmci_send_command(host, data->stop, host->stop_cmdr);
587         atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
588 }
589
590 /*
591  * Configure given PDC buffer taking care of alignement issues.
592  * Update host->data_size and host->sg.
593  */
594 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
595         enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
596 {
597         u32 pointer_reg, counter_reg;
598
599         if (dir == XFER_RECEIVE) {
600                 pointer_reg = ATMEL_PDC_RPR;
601                 counter_reg = ATMEL_PDC_RCR;
602         } else {
603                 pointer_reg = ATMEL_PDC_TPR;
604                 counter_reg = ATMEL_PDC_TCR;
605         }
606
607         if (buf_nb == PDC_SECOND_BUF) {
608                 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
609                 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
610         }
611
612         atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
613         if (host->data_size <= sg_dma_len(host->sg)) {
614                 if (host->data_size & 0x3) {
615                         /* If size is different from modulo 4, transfer bytes */
616                         atmci_writel(host, counter_reg, host->data_size);
617                         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
618                 } else {
619                         /* Else transfer 32-bits words */
620                         atmci_writel(host, counter_reg, host->data_size / 4);
621                 }
622                 host->data_size = 0;
623         } else {
624                 /* We assume the size of a page is 32-bits aligned */
625                 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
626                 host->data_size -= sg_dma_len(host->sg);
627                 if (host->data_size)
628                         host->sg = sg_next(host->sg);
629         }
630 }
631
632 /*
633  * Configure PDC buffer according to the data size ie configuring one or two
634  * buffers. Don't use this function if you want to configure only the second
635  * buffer. In this case, use atmci_pdc_set_single_buf.
636  */
637 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
638 {
639         atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
640         if (host->data_size)
641                 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
642 }
643
644 /*
645  * Unmap sg lists, called when transfer is finished.
646  */
647 static void atmci_pdc_cleanup(struct atmel_mci *host)
648 {
649         struct mmc_data         *data = host->data;
650
651         if (data)
652                 dma_unmap_sg(&host->pdev->dev,
653                                 data->sg, data->sg_len,
654                                 ((data->flags & MMC_DATA_WRITE)
655                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
656 }
657
658 /*
659  * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
660  * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
661  * interrupt needed for both transfer directions.
662  */
663 static void atmci_pdc_complete(struct atmel_mci *host)
664 {
665         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
666         atmci_pdc_cleanup(host);
667
668         /*
669          * If the card was removed, data will be NULL. No point trying
670          * to send the stop command or waiting for NBUSY in this case.
671          */
672         if (host->data) {
673                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
674                 tasklet_schedule(&host->tasklet);
675                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
676         }
677 }
678
679 static void atmci_dma_cleanup(struct atmel_mci *host)
680 {
681         struct mmc_data                 *data = host->data;
682
683         if (data)
684                 dma_unmap_sg(host->dma.chan->device->dev,
685                                 data->sg, data->sg_len,
686                                 ((data->flags & MMC_DATA_WRITE)
687                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
688 }
689
690 /*
691  * This function is called by the DMA driver from tasklet context.
692  */
693 static void atmci_dma_complete(void *arg)
694 {
695         struct atmel_mci        *host = arg;
696         struct mmc_data         *data = host->data;
697
698         dev_vdbg(&host->pdev->dev, "DMA complete\n");
699
700         if (host->caps.has_dma)
701                 /* Disable DMA hardware handshaking on MCI */
702                 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
703
704         atmci_dma_cleanup(host);
705
706         /*
707          * If the card was removed, data will be NULL. No point trying
708          * to send the stop command or waiting for NBUSY in this case.
709          */
710         if (data) {
711                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
712                 tasklet_schedule(&host->tasklet);
713
714                 /*
715                  * Regardless of what the documentation says, we have
716                  * to wait for NOTBUSY even after block read
717                  * operations.
718                  *
719                  * When the DMA transfer is complete, the controller
720                  * may still be reading the CRC from the card, i.e.
721                  * the data transfer is still in progress and we
722                  * haven't seen all the potential error bits yet.
723                  *
724                  * The interrupt handler will schedule a different
725                  * tasklet to finish things up when the data transfer
726                  * is completely done.
727                  *
728                  * We may not complete the mmc request here anyway
729                  * because the mmc layer may call back and cause us to
730                  * violate the "don't submit new operations from the
731                  * completion callback" rule of the dma engine
732                  * framework.
733                  */
734                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
735         }
736 }
737
738 /*
739  * Returns a mask of interrupt flags to be enabled after the whole
740  * request has been prepared.
741  */
742 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
743 {
744         u32 iflags;
745
746         data->error = -EINPROGRESS;
747
748         host->sg = data->sg;
749         host->data = data;
750         host->data_chan = NULL;
751
752         iflags = ATMCI_DATA_ERROR_FLAGS;
753
754         /*
755          * Errata: MMC data write operation with less than 12
756          * bytes is impossible.
757          *
758          * Errata: MCI Transmit Data Register (TDR) FIFO
759          * corruption when length is not multiple of 4.
760          */
761         if (data->blocks * data->blksz < 12
762                         || (data->blocks * data->blksz) & 3)
763                 host->need_reset = true;
764
765         host->pio_offset = 0;
766         if (data->flags & MMC_DATA_READ)
767                 iflags |= ATMCI_RXRDY;
768         else
769                 iflags |= ATMCI_TXRDY;
770
771         return iflags;
772 }
773
774 /*
775  * Set interrupt flags and set block length into the MCI mode register even
776  * if this value is also accessible in the MCI block register. It seems to be
777  * necessary before the High Speed MCI version. It also map sg and configure
778  * PDC registers.
779  */
780 static u32
781 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
782 {
783         u32 iflags, tmp;
784         unsigned int sg_len;
785         enum dma_data_direction dir;
786
787         data->error = -EINPROGRESS;
788
789         host->data = data;
790         host->sg = data->sg;
791         iflags = ATMCI_DATA_ERROR_FLAGS;
792
793         /* Enable pdc mode */
794         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
795
796         if (data->flags & MMC_DATA_READ) {
797                 dir = DMA_FROM_DEVICE;
798                 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
799         } else {
800                 dir = DMA_TO_DEVICE;
801                 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE;
802         }
803
804         /* Set BLKLEN */
805         tmp = atmci_readl(host, ATMCI_MR);
806         tmp &= 0x0000ffff;
807         tmp |= ATMCI_BLKLEN(data->blksz);
808         atmci_writel(host, ATMCI_MR, tmp);
809
810         /* Configure PDC */
811         host->data_size = data->blocks * data->blksz;
812         sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
813         if (host->data_size)
814                 atmci_pdc_set_both_buf(host,
815                         ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
816
817         return iflags;
818 }
819
820 static u32
821 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
822 {
823         struct dma_chan                 *chan;
824         struct dma_async_tx_descriptor  *desc;
825         struct scatterlist              *sg;
826         unsigned int                    i;
827         enum dma_data_direction         direction;
828         enum dma_transfer_direction     slave_dirn;
829         unsigned int                    sglen;
830         u32 iflags;
831
832         data->error = -EINPROGRESS;
833
834         WARN_ON(host->data);
835         host->sg = NULL;
836         host->data = data;
837
838         iflags = ATMCI_DATA_ERROR_FLAGS;
839
840         /*
841          * We don't do DMA on "complex" transfers, i.e. with
842          * non-word-aligned buffers or lengths. Also, we don't bother
843          * with all the DMA setup overhead for short transfers.
844          */
845         if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
846                 return atmci_prepare_data(host, data);
847         if (data->blksz & 3)
848                 return atmci_prepare_data(host, data);
849
850         for_each_sg(data->sg, sg, data->sg_len, i) {
851                 if (sg->offset & 3 || sg->length & 3)
852                         return atmci_prepare_data(host, data);
853         }
854
855         /* If we don't have a channel, we can't do DMA */
856         chan = host->dma.chan;
857         if (chan)
858                 host->data_chan = chan;
859
860         if (!chan)
861                 return -ENODEV;
862
863         if (host->caps.has_dma)
864                 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(3) | ATMCI_DMAEN);
865
866         if (data->flags & MMC_DATA_READ) {
867                 direction = DMA_FROM_DEVICE;
868                 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
869         } else {
870                 direction = DMA_TO_DEVICE;
871                 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
872         }
873
874         sglen = dma_map_sg(chan->device->dev, data->sg,
875                         data->sg_len, direction);
876
877         dmaengine_slave_config(chan, &host->dma_conf);
878         desc = dmaengine_prep_slave_sg(chan,
879                         data->sg, sglen, slave_dirn,
880                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
881         if (!desc)
882                 goto unmap_exit;
883
884         host->dma.data_desc = desc;
885         desc->callback = atmci_dma_complete;
886         desc->callback_param = host;
887
888         return iflags;
889 unmap_exit:
890         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
891         return -ENOMEM;
892 }
893
894 static void
895 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
896 {
897         return;
898 }
899
900 /*
901  * Start PDC according to transfer direction.
902  */
903 static void
904 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
905 {
906         if (data->flags & MMC_DATA_READ)
907                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
908         else
909                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
910 }
911
912 static void
913 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
914 {
915         struct dma_chan                 *chan = host->data_chan;
916         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
917
918         if (chan) {
919                 dmaengine_submit(desc);
920                 dma_async_issue_pending(chan);
921         }
922 }
923
924 static void atmci_stop_transfer(struct atmel_mci *host)
925 {
926         atmci_set_pending(host, EVENT_XFER_COMPLETE);
927         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
928 }
929
930 /*
931  * Stop data transfer because error(s) occured.
932  */
933 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
934 {
935         atmci_set_pending(host, EVENT_XFER_COMPLETE);
936         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
937 }
938
939 static void atmci_stop_transfer_dma(struct atmel_mci *host)
940 {
941         struct dma_chan *chan = host->data_chan;
942
943         if (chan) {
944                 dmaengine_terminate_all(chan);
945                 atmci_dma_cleanup(host);
946         } else {
947                 /* Data transfer was stopped by the interrupt handler */
948                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
949                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
950         }
951 }
952
953 /*
954  * Start a request: prepare data if needed, prepare the command and activate
955  * interrupts.
956  */
957 static void atmci_start_request(struct atmel_mci *host,
958                 struct atmel_mci_slot *slot)
959 {
960         struct mmc_request      *mrq;
961         struct mmc_command      *cmd;
962         struct mmc_data         *data;
963         u32                     iflags;
964         u32                     cmdflags;
965
966         mrq = slot->mrq;
967         host->cur_slot = slot;
968         host->mrq = mrq;
969
970         host->pending_events = 0;
971         host->completed_events = 0;
972         host->data_status = 0;
973
974         if (host->need_reset) {
975                 iflags = atmci_readl(host, ATMCI_IMR);
976                 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
977                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
978                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
979                 atmci_writel(host, ATMCI_MR, host->mode_reg);
980                 if (host->caps.has_cfg_reg)
981                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
982                 atmci_writel(host, ATMCI_IER, iflags);
983                 host->need_reset = false;
984         }
985         atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
986
987         iflags = atmci_readl(host, ATMCI_IMR);
988         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
989                 dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
990                                 iflags);
991
992         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
993                 /* Send init sequence (74 clock cycles) */
994                 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
995                 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
996                         cpu_relax();
997         }
998         iflags = 0;
999         data = mrq->data;
1000         if (data) {
1001                 atmci_set_timeout(host, slot, data);
1002
1003                 /* Must set block count/size before sending command */
1004                 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1005                                 | ATMCI_BLKLEN(data->blksz));
1006                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1007                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1008
1009                 iflags |= host->prepare_data(host, data);
1010         }
1011
1012         iflags |= ATMCI_CMDRDY;
1013         cmd = mrq->cmd;
1014         cmdflags = atmci_prepare_command(slot->mmc, cmd);
1015         atmci_send_command(host, cmd, cmdflags);
1016
1017         if (data)
1018                 host->submit_data(host, data);
1019
1020         if (mrq->stop) {
1021                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1022                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1023                 if (!(data->flags & MMC_DATA_WRITE))
1024                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1025                 if (data->flags & MMC_DATA_STREAM)
1026                         host->stop_cmdr |= ATMCI_CMDR_STREAM;
1027                 else
1028                         host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1029         }
1030
1031         /*
1032          * We could have enabled interrupts earlier, but I suspect
1033          * that would open up a nice can of interesting race
1034          * conditions (e.g. command and data complete, but stop not
1035          * prepared yet.)
1036          */
1037         atmci_writel(host, ATMCI_IER, iflags);
1038 }
1039
1040 static void atmci_queue_request(struct atmel_mci *host,
1041                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1042 {
1043         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1044                         host->state);
1045
1046         spin_lock_bh(&host->lock);
1047         slot->mrq = mrq;
1048         if (host->state == STATE_IDLE) {
1049                 host->state = STATE_SENDING_CMD;
1050                 atmci_start_request(host, slot);
1051         } else {
1052                 list_add_tail(&slot->queue_node, &host->queue);
1053         }
1054         spin_unlock_bh(&host->lock);
1055 }
1056
1057 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1058 {
1059         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1060         struct atmel_mci        *host = slot->host;
1061         struct mmc_data         *data;
1062
1063         WARN_ON(slot->mrq);
1064
1065         /*
1066          * We may "know" the card is gone even though there's still an
1067          * electrical connection. If so, we really need to communicate
1068          * this to the MMC core since there won't be any more
1069          * interrupts as the card is completely removed. Otherwise,
1070          * the MMC core might believe the card is still there even
1071          * though the card was just removed very slowly.
1072          */
1073         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1074                 mrq->cmd->error = -ENOMEDIUM;
1075                 mmc_request_done(mmc, mrq);
1076                 return;
1077         }
1078
1079         /* We don't support multiple blocks of weird lengths. */
1080         data = mrq->data;
1081         if (data && data->blocks > 1 && data->blksz & 3) {
1082                 mrq->cmd->error = -EINVAL;
1083                 mmc_request_done(mmc, mrq);
1084         }
1085
1086         atmci_queue_request(host, slot, mrq);
1087 }
1088
1089 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1090 {
1091         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1092         struct atmel_mci        *host = slot->host;
1093         unsigned int            i;
1094
1095         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1096         switch (ios->bus_width) {
1097         case MMC_BUS_WIDTH_1:
1098                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1099                 break;
1100         case MMC_BUS_WIDTH_4:
1101                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1102                 break;
1103         }
1104
1105         if (ios->clock) {
1106                 unsigned int clock_min = ~0U;
1107                 u32 clkdiv;
1108
1109                 spin_lock_bh(&host->lock);
1110                 if (!host->mode_reg) {
1111                         clk_enable(host->mck);
1112                         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1113                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1114                         if (host->caps.has_cfg_reg)
1115                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1116                 }
1117
1118                 /*
1119                  * Use mirror of ios->clock to prevent race with mmc
1120                  * core ios update when finding the minimum.
1121                  */
1122                 slot->clock = ios->clock;
1123                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1124                         if (host->slot[i] && host->slot[i]->clock
1125                                         && host->slot[i]->clock < clock_min)
1126                                 clock_min = host->slot[i]->clock;
1127                 }
1128
1129                 /* Calculate clock divider */
1130                 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1131                 if (clkdiv > 255) {
1132                         dev_warn(&mmc->class_dev,
1133                                 "clock %u too slow; using %lu\n",
1134                                 clock_min, host->bus_hz / (2 * 256));
1135                         clkdiv = 255;
1136                 }
1137
1138                 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1139
1140                 /*
1141                  * WRPROOF and RDPROOF prevent overruns/underruns by
1142                  * stopping the clock when the FIFO is full/empty.
1143                  * This state is not expected to last for long.
1144                  */
1145                 if (host->caps.has_rwproof)
1146                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1147
1148                 if (host->caps.has_cfg_reg) {
1149                         /* setup High Speed mode in relation with card capacity */
1150                         if (ios->timing == MMC_TIMING_SD_HS)
1151                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
1152                         else
1153                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1154                 }
1155
1156                 if (list_empty(&host->queue)) {
1157                         atmci_writel(host, ATMCI_MR, host->mode_reg);
1158                         if (host->caps.has_cfg_reg)
1159                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1160                 } else {
1161                         host->need_clock_update = true;
1162                 }
1163
1164                 spin_unlock_bh(&host->lock);
1165         } else {
1166                 bool any_slot_active = false;
1167
1168                 spin_lock_bh(&host->lock);
1169                 slot->clock = 0;
1170                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1171                         if (host->slot[i] && host->slot[i]->clock) {
1172                                 any_slot_active = true;
1173                                 break;
1174                         }
1175                 }
1176                 if (!any_slot_active) {
1177                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1178                         if (host->mode_reg) {
1179                                 atmci_readl(host, ATMCI_MR);
1180                                 clk_disable(host->mck);
1181                         }
1182                         host->mode_reg = 0;
1183                 }
1184                 spin_unlock_bh(&host->lock);
1185         }
1186
1187         switch (ios->power_mode) {
1188         case MMC_POWER_UP:
1189                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1190                 break;
1191         default:
1192                 /*
1193                  * TODO: None of the currently available AVR32-based
1194                  * boards allow MMC power to be turned off. Implement
1195                  * power control when this can be tested properly.
1196                  *
1197                  * We also need to hook this into the clock management
1198                  * somehow so that newly inserted cards aren't
1199                  * subjected to a fast clock before we have a chance
1200                  * to figure out what the maximum rate is. Currently,
1201                  * there's no way to avoid this, and there never will
1202                  * be for boards that don't support power control.
1203                  */
1204                 break;
1205         }
1206 }
1207
1208 static int atmci_get_ro(struct mmc_host *mmc)
1209 {
1210         int                     read_only = -ENOSYS;
1211         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1212
1213         if (gpio_is_valid(slot->wp_pin)) {
1214                 read_only = gpio_get_value(slot->wp_pin);
1215                 dev_dbg(&mmc->class_dev, "card is %s\n",
1216                                 read_only ? "read-only" : "read-write");
1217         }
1218
1219         return read_only;
1220 }
1221
1222 static int atmci_get_cd(struct mmc_host *mmc)
1223 {
1224         int                     present = -ENOSYS;
1225         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1226
1227         if (gpio_is_valid(slot->detect_pin)) {
1228                 present = !(gpio_get_value(slot->detect_pin) ^
1229                             slot->detect_is_active_high);
1230                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1231                                 present ? "" : "not ");
1232         }
1233
1234         return present;
1235 }
1236
1237 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1238 {
1239         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1240         struct atmel_mci        *host = slot->host;
1241
1242         if (enable)
1243                 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1244         else
1245                 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1246 }
1247
1248 static const struct mmc_host_ops atmci_ops = {
1249         .request        = atmci_request,
1250         .set_ios        = atmci_set_ios,
1251         .get_ro         = atmci_get_ro,
1252         .get_cd         = atmci_get_cd,
1253         .enable_sdio_irq = atmci_enable_sdio_irq,
1254 };
1255
1256 /* Called with host->lock held */
1257 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1258         __releases(&host->lock)
1259         __acquires(&host->lock)
1260 {
1261         struct atmel_mci_slot   *slot = NULL;
1262         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1263
1264         WARN_ON(host->cmd || host->data);
1265
1266         /*
1267          * Update the MMC clock rate if necessary. This may be
1268          * necessary if set_ios() is called when a different slot is
1269          * busy transferring data.
1270          */
1271         if (host->need_clock_update) {
1272                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1273                 if (host->caps.has_cfg_reg)
1274                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1275         }
1276
1277         host->cur_slot->mrq = NULL;
1278         host->mrq = NULL;
1279         if (!list_empty(&host->queue)) {
1280                 slot = list_entry(host->queue.next,
1281                                 struct atmel_mci_slot, queue_node);
1282                 list_del(&slot->queue_node);
1283                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1284                                 mmc_hostname(slot->mmc));
1285                 host->state = STATE_SENDING_CMD;
1286                 atmci_start_request(host, slot);
1287         } else {
1288                 dev_vdbg(&host->pdev->dev, "list empty\n");
1289                 host->state = STATE_IDLE;
1290         }
1291
1292         spin_unlock(&host->lock);
1293         mmc_request_done(prev_mmc, mrq);
1294         spin_lock(&host->lock);
1295 }
1296
1297 static void atmci_command_complete(struct atmel_mci *host,
1298                         struct mmc_command *cmd)
1299 {
1300         u32             status = host->cmd_status;
1301
1302         /* Read the response from the card (up to 16 bytes) */
1303         cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1304         cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1305         cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1306         cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1307
1308         if (status & ATMCI_RTOE)
1309                 cmd->error = -ETIMEDOUT;
1310         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1311                 cmd->error = -EILSEQ;
1312         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1313                 cmd->error = -EIO;
1314         else
1315                 cmd->error = 0;
1316
1317         if (cmd->error) {
1318                 dev_dbg(&host->pdev->dev,
1319                         "command error: status=0x%08x\n", status);
1320
1321                 if (cmd->data) {
1322                         host->stop_transfer(host);
1323                         host->data = NULL;
1324                         atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY
1325                                         | ATMCI_TXRDY | ATMCI_RXRDY
1326                                         | ATMCI_DATA_ERROR_FLAGS);
1327                 }
1328         }
1329 }
1330
1331 static void atmci_detect_change(unsigned long data)
1332 {
1333         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
1334         bool                    present;
1335         bool                    present_old;
1336
1337         /*
1338          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1339          * freeing the interrupt. We must not re-enable the interrupt
1340          * if it has been freed, and if we're shutting down, it
1341          * doesn't really matter whether the card is present or not.
1342          */
1343         smp_rmb();
1344         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1345                 return;
1346
1347         enable_irq(gpio_to_irq(slot->detect_pin));
1348         present = !(gpio_get_value(slot->detect_pin) ^
1349                     slot->detect_is_active_high);
1350         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1351
1352         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1353                         present, present_old);
1354
1355         if (present != present_old) {
1356                 struct atmel_mci        *host = slot->host;
1357                 struct mmc_request      *mrq;
1358
1359                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1360                         present ? "inserted" : "removed");
1361
1362                 spin_lock(&host->lock);
1363
1364                 if (!present)
1365                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1366                 else
1367                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1368
1369                 /* Clean up queue if present */
1370                 mrq = slot->mrq;
1371                 if (mrq) {
1372                         if (mrq == host->mrq) {
1373                                 /*
1374                                  * Reset controller to terminate any ongoing
1375                                  * commands or data transfers.
1376                                  */
1377                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1378                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1379                                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1380                                 if (host->caps.has_cfg_reg)
1381                                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1382
1383                                 host->data = NULL;
1384                                 host->cmd = NULL;
1385
1386                                 switch (host->state) {
1387                                 case STATE_IDLE:
1388                                         break;
1389                                 case STATE_SENDING_CMD:
1390                                         mrq->cmd->error = -ENOMEDIUM;
1391                                         if (!mrq->data)
1392                                                 break;
1393                                         /* fall through */
1394                                 case STATE_SENDING_DATA:
1395                                         mrq->data->error = -ENOMEDIUM;
1396                                         host->stop_transfer(host);
1397                                         break;
1398                                 case STATE_DATA_BUSY:
1399                                 case STATE_DATA_ERROR:
1400                                         if (mrq->data->error == -EINPROGRESS)
1401                                                 mrq->data->error = -ENOMEDIUM;
1402                                         if (!mrq->stop)
1403                                                 break;
1404                                         /* fall through */
1405                                 case STATE_SENDING_STOP:
1406                                         mrq->stop->error = -ENOMEDIUM;
1407                                         break;
1408                                 }
1409
1410                                 atmci_request_end(host, mrq);
1411                         } else {
1412                                 list_del(&slot->queue_node);
1413                                 mrq->cmd->error = -ENOMEDIUM;
1414                                 if (mrq->data)
1415                                         mrq->data->error = -ENOMEDIUM;
1416                                 if (mrq->stop)
1417                                         mrq->stop->error = -ENOMEDIUM;
1418
1419                                 spin_unlock(&host->lock);
1420                                 mmc_request_done(slot->mmc, mrq);
1421                                 spin_lock(&host->lock);
1422                         }
1423                 }
1424                 spin_unlock(&host->lock);
1425
1426                 mmc_detect_change(slot->mmc, 0);
1427         }
1428 }
1429
1430 static void atmci_tasklet_func(unsigned long priv)
1431 {
1432         struct atmel_mci        *host = (struct atmel_mci *)priv;
1433         struct mmc_request      *mrq = host->mrq;
1434         struct mmc_data         *data = host->data;
1435         struct mmc_command      *cmd = host->cmd;
1436         enum atmel_mci_state    state = host->state;
1437         enum atmel_mci_state    prev_state;
1438         u32                     status;
1439
1440         spin_lock(&host->lock);
1441
1442         state = host->state;
1443
1444         dev_vdbg(&host->pdev->dev,
1445                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1446                 state, host->pending_events, host->completed_events,
1447                 atmci_readl(host, ATMCI_IMR));
1448
1449         do {
1450                 prev_state = state;
1451
1452                 switch (state) {
1453                 case STATE_IDLE:
1454                         break;
1455
1456                 case STATE_SENDING_CMD:
1457                         if (!atmci_test_and_clear_pending(host,
1458                                                 EVENT_CMD_COMPLETE))
1459                                 break;
1460
1461                         host->cmd = NULL;
1462                         atmci_set_completed(host, EVENT_CMD_COMPLETE);
1463                         atmci_command_complete(host, mrq->cmd);
1464                         if (!mrq->data || cmd->error) {
1465                                 atmci_request_end(host, host->mrq);
1466                                 goto unlock;
1467                         }
1468
1469                         prev_state = state = STATE_SENDING_DATA;
1470                         /* fall through */
1471
1472                 case STATE_SENDING_DATA:
1473                         if (atmci_test_and_clear_pending(host,
1474                                                 EVENT_DATA_ERROR)) {
1475                                 host->stop_transfer(host);
1476                                 if (data->stop)
1477                                         atmci_send_stop_cmd(host, data);
1478                                 state = STATE_DATA_ERROR;
1479                                 break;
1480                         }
1481
1482                         if (!atmci_test_and_clear_pending(host,
1483                                                 EVENT_XFER_COMPLETE))
1484                                 break;
1485
1486                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1487                         prev_state = state = STATE_DATA_BUSY;
1488                         /* fall through */
1489
1490                 case STATE_DATA_BUSY:
1491                         if (!atmci_test_and_clear_pending(host,
1492                                                 EVENT_DATA_COMPLETE))
1493                                 break;
1494
1495                         host->data = NULL;
1496                         atmci_set_completed(host, EVENT_DATA_COMPLETE);
1497                         status = host->data_status;
1498                         if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) {
1499                                 if (status & ATMCI_DTOE) {
1500                                         dev_dbg(&host->pdev->dev,
1501                                                         "data timeout error\n");
1502                                         data->error = -ETIMEDOUT;
1503                                 } else if (status & ATMCI_DCRCE) {
1504                                         dev_dbg(&host->pdev->dev,
1505                                                         "data CRC error\n");
1506                                         data->error = -EILSEQ;
1507                                 } else {
1508                                         dev_dbg(&host->pdev->dev,
1509                                                 "data FIFO error (status=%08x)\n",
1510                                                 status);
1511                                         data->error = -EIO;
1512                                 }
1513                         } else {
1514                                 data->bytes_xfered = data->blocks * data->blksz;
1515                                 data->error = 0;
1516                                 atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS);
1517                         }
1518
1519                         if (!data->stop) {
1520                                 atmci_request_end(host, host->mrq);
1521                                 goto unlock;
1522                         }
1523
1524                         prev_state = state = STATE_SENDING_STOP;
1525                         if (!data->error)
1526                                 atmci_send_stop_cmd(host, data);
1527                         /* fall through */
1528
1529                 case STATE_SENDING_STOP:
1530                         if (!atmci_test_and_clear_pending(host,
1531                                                 EVENT_CMD_COMPLETE))
1532                                 break;
1533
1534                         host->cmd = NULL;
1535                         atmci_command_complete(host, mrq->stop);
1536                         atmci_request_end(host, host->mrq);
1537                         goto unlock;
1538
1539                 case STATE_DATA_ERROR:
1540                         if (!atmci_test_and_clear_pending(host,
1541                                                 EVENT_XFER_COMPLETE))
1542                                 break;
1543
1544                         state = STATE_DATA_BUSY;
1545                         break;
1546                 }
1547         } while (state != prev_state);
1548
1549         host->state = state;
1550
1551 unlock:
1552         spin_unlock(&host->lock);
1553 }
1554
1555 static void atmci_read_data_pio(struct atmel_mci *host)
1556 {
1557         struct scatterlist      *sg = host->sg;
1558         void                    *buf = sg_virt(sg);
1559         unsigned int            offset = host->pio_offset;
1560         struct mmc_data         *data = host->data;
1561         u32                     value;
1562         u32                     status;
1563         unsigned int            nbytes = 0;
1564
1565         do {
1566                 value = atmci_readl(host, ATMCI_RDR);
1567                 if (likely(offset + 4 <= sg->length)) {
1568                         put_unaligned(value, (u32 *)(buf + offset));
1569
1570                         offset += 4;
1571                         nbytes += 4;
1572
1573                         if (offset == sg->length) {
1574                                 flush_dcache_page(sg_page(sg));
1575                                 host->sg = sg = sg_next(sg);
1576                                 if (!sg)
1577                                         goto done;
1578
1579                                 offset = 0;
1580                                 buf = sg_virt(sg);
1581                         }
1582                 } else {
1583                         unsigned int remaining = sg->length - offset;
1584                         memcpy(buf + offset, &value, remaining);
1585                         nbytes += remaining;
1586
1587                         flush_dcache_page(sg_page(sg));
1588                         host->sg = sg = sg_next(sg);
1589                         if (!sg)
1590                                 goto done;
1591
1592                         offset = 4 - remaining;
1593                         buf = sg_virt(sg);
1594                         memcpy(buf, (u8 *)&value + remaining, offset);
1595                         nbytes += offset;
1596                 }
1597
1598                 status = atmci_readl(host, ATMCI_SR);
1599                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1600                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
1601                                                 | ATMCI_DATA_ERROR_FLAGS));
1602                         host->data_status = status;
1603                         data->bytes_xfered += nbytes;
1604                         smp_wmb();
1605                         atmci_set_pending(host, EVENT_DATA_ERROR);
1606                         tasklet_schedule(&host->tasklet);
1607                         return;
1608                 }
1609         } while (status & ATMCI_RXRDY);
1610
1611         host->pio_offset = offset;
1612         data->bytes_xfered += nbytes;
1613
1614         return;
1615
1616 done:
1617         atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
1618         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1619         data->bytes_xfered += nbytes;
1620         smp_wmb();
1621         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1622 }
1623
1624 static void atmci_write_data_pio(struct atmel_mci *host)
1625 {
1626         struct scatterlist      *sg = host->sg;
1627         void                    *buf = sg_virt(sg);
1628         unsigned int            offset = host->pio_offset;
1629         struct mmc_data         *data = host->data;
1630         u32                     value;
1631         u32                     status;
1632         unsigned int            nbytes = 0;
1633
1634         do {
1635                 if (likely(offset + 4 <= sg->length)) {
1636                         value = get_unaligned((u32 *)(buf + offset));
1637                         atmci_writel(host, ATMCI_TDR, value);
1638
1639                         offset += 4;
1640                         nbytes += 4;
1641                         if (offset == sg->length) {
1642                                 host->sg = sg = sg_next(sg);
1643                                 if (!sg)
1644                                         goto done;
1645
1646                                 offset = 0;
1647                                 buf = sg_virt(sg);
1648                         }
1649                 } else {
1650                         unsigned int remaining = sg->length - offset;
1651
1652                         value = 0;
1653                         memcpy(&value, buf + offset, remaining);
1654                         nbytes += remaining;
1655
1656                         host->sg = sg = sg_next(sg);
1657                         if (!sg) {
1658                                 atmci_writel(host, ATMCI_TDR, value);
1659                                 goto done;
1660                         }
1661
1662                         offset = 4 - remaining;
1663                         buf = sg_virt(sg);
1664                         memcpy((u8 *)&value + remaining, buf, offset);
1665                         atmci_writel(host, ATMCI_TDR, value);
1666                         nbytes += offset;
1667                 }
1668
1669                 status = atmci_readl(host, ATMCI_SR);
1670                 if (status & ATMCI_DATA_ERROR_FLAGS) {
1671                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
1672                                                 | ATMCI_DATA_ERROR_FLAGS));
1673                         host->data_status = status;
1674                         data->bytes_xfered += nbytes;
1675                         smp_wmb();
1676                         atmci_set_pending(host, EVENT_DATA_ERROR);
1677                         tasklet_schedule(&host->tasklet);
1678                         return;
1679                 }
1680         } while (status & ATMCI_TXRDY);
1681
1682         host->pio_offset = offset;
1683         data->bytes_xfered += nbytes;
1684
1685         return;
1686
1687 done:
1688         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
1689         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1690         data->bytes_xfered += nbytes;
1691         smp_wmb();
1692         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1693 }
1694
1695 static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
1696 {
1697         atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
1698
1699         host->cmd_status = status;
1700         smp_wmb();
1701         atmci_set_pending(host, EVENT_CMD_COMPLETE);
1702         tasklet_schedule(&host->tasklet);
1703 }
1704
1705 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
1706 {
1707         int     i;
1708
1709         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1710                 struct atmel_mci_slot *slot = host->slot[i];
1711                 if (slot && (status & slot->sdio_irq)) {
1712                         mmc_signal_sdio_irq(slot->mmc);
1713                 }
1714         }
1715 }
1716
1717
1718 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
1719 {
1720         struct atmel_mci        *host = dev_id;
1721         u32                     status, mask, pending;
1722         unsigned int            pass_count = 0;
1723
1724         do {
1725                 status = atmci_readl(host, ATMCI_SR);
1726                 mask = atmci_readl(host, ATMCI_IMR);
1727                 pending = status & mask;
1728                 if (!pending)
1729                         break;
1730
1731                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
1732                         atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
1733                                         | ATMCI_RXRDY | ATMCI_TXRDY);
1734                         pending &= atmci_readl(host, ATMCI_IMR);
1735
1736                         host->data_status = status;
1737                         smp_wmb();
1738                         atmci_set_pending(host, EVENT_DATA_ERROR);
1739                         tasklet_schedule(&host->tasklet);
1740                 }
1741
1742                 if (pending & ATMCI_TXBUFE) {
1743                         atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
1744                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
1745                         /*
1746                          * We can receive this interruption before having configured
1747                          * the second pdc buffer, so we need to reconfigure first and
1748                          * second buffers again
1749                          */
1750                         if (host->data_size) {
1751                                 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
1752                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
1753                                 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
1754                         } else {
1755                                 atmci_pdc_complete(host);
1756                         }
1757                 } else if (pending & ATMCI_ENDTX) {
1758                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
1759
1760                         if (host->data_size) {
1761                                 atmci_pdc_set_single_buf(host,
1762                                                 XFER_TRANSMIT, PDC_SECOND_BUF);
1763                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
1764                         }
1765                 }
1766
1767                 if (pending & ATMCI_RXBUFF) {
1768                         atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
1769                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
1770                         /*
1771                          * We can receive this interruption before having configured
1772                          * the second pdc buffer, so we need to reconfigure first and
1773                          * second buffers again
1774                          */
1775                         if (host->data_size) {
1776                                 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
1777                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
1778                                 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
1779                         } else {
1780                                 atmci_pdc_complete(host);
1781                         }
1782                 } else if (pending & ATMCI_ENDRX) {
1783                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
1784
1785                         if (host->data_size) {
1786                                 atmci_pdc_set_single_buf(host,
1787                                                 XFER_RECEIVE, PDC_SECOND_BUF);
1788                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
1789                         }
1790                 }
1791
1792
1793                 if (pending & ATMCI_NOTBUSY) {
1794                         atmci_writel(host, ATMCI_IDR,
1795                                         ATMCI_DATA_ERROR_FLAGS | ATMCI_NOTBUSY);
1796                         if (!host->data_status)
1797                                 host->data_status = status;
1798                         smp_wmb();
1799                         atmci_set_pending(host, EVENT_DATA_COMPLETE);
1800                         tasklet_schedule(&host->tasklet);
1801                 }
1802                 if (pending & ATMCI_RXRDY)
1803                         atmci_read_data_pio(host);
1804                 if (pending & ATMCI_TXRDY)
1805                         atmci_write_data_pio(host);
1806
1807                 if (pending & ATMCI_CMDRDY)
1808                         atmci_cmd_interrupt(host, status);
1809
1810                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1811                         atmci_sdio_interrupt(host, status);
1812
1813         } while (pass_count++ < 5);
1814
1815         return pass_count ? IRQ_HANDLED : IRQ_NONE;
1816 }
1817
1818 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
1819 {
1820         struct atmel_mci_slot   *slot = dev_id;
1821
1822         /*
1823          * Disable interrupts until the pin has stabilized and check
1824          * the state then. Use mod_timer() since we may be in the
1825          * middle of the timer routine when this interrupt triggers.
1826          */
1827         disable_irq_nosync(irq);
1828         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
1829
1830         return IRQ_HANDLED;
1831 }
1832
1833 static int __init atmci_init_slot(struct atmel_mci *host,
1834                 struct mci_slot_pdata *slot_data, unsigned int id,
1835                 u32 sdc_reg, u32 sdio_irq)
1836 {
1837         struct mmc_host                 *mmc;
1838         struct atmel_mci_slot           *slot;
1839
1840         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
1841         if (!mmc)
1842                 return -ENOMEM;
1843
1844         slot = mmc_priv(mmc);
1845         slot->mmc = mmc;
1846         slot->host = host;
1847         slot->detect_pin = slot_data->detect_pin;
1848         slot->wp_pin = slot_data->wp_pin;
1849         slot->detect_is_active_high = slot_data->detect_is_active_high;
1850         slot->sdc_reg = sdc_reg;
1851         slot->sdio_irq = sdio_irq;
1852
1853         mmc->ops = &atmci_ops;
1854         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
1855         mmc->f_max = host->bus_hz / 2;
1856         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
1857         if (sdio_irq)
1858                 mmc->caps |= MMC_CAP_SDIO_IRQ;
1859         if (host->caps.has_highspeed)
1860                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1861         if (slot_data->bus_width >= 4)
1862                 mmc->caps |= MMC_CAP_4_BIT_DATA;
1863
1864         mmc->max_segs = 64;
1865         mmc->max_req_size = 32768 * 512;
1866         mmc->max_blk_size = 32768;
1867         mmc->max_blk_count = 512;
1868
1869         /* Assume card is present initially */
1870         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1871         if (gpio_is_valid(slot->detect_pin)) {
1872                 if (gpio_request(slot->detect_pin, "mmc_detect")) {
1873                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
1874                         slot->detect_pin = -EBUSY;
1875                 } else if (gpio_get_value(slot->detect_pin) ^
1876                                 slot->detect_is_active_high) {
1877                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1878                 }
1879         }
1880
1881         if (!gpio_is_valid(slot->detect_pin))
1882                 mmc->caps |= MMC_CAP_NEEDS_POLL;
1883
1884         if (gpio_is_valid(slot->wp_pin)) {
1885                 if (gpio_request(slot->wp_pin, "mmc_wp")) {
1886                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
1887                         slot->wp_pin = -EBUSY;
1888                 }
1889         }
1890
1891         host->slot[id] = slot;
1892         mmc_add_host(mmc);
1893
1894         if (gpio_is_valid(slot->detect_pin)) {
1895                 int ret;
1896
1897                 setup_timer(&slot->detect_timer, atmci_detect_change,
1898                                 (unsigned long)slot);
1899
1900                 ret = request_irq(gpio_to_irq(slot->detect_pin),
1901                                 atmci_detect_interrupt,
1902                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
1903                                 "mmc-detect", slot);
1904                 if (ret) {
1905                         dev_dbg(&mmc->class_dev,
1906                                 "could not request IRQ %d for detect pin\n",
1907                                 gpio_to_irq(slot->detect_pin));
1908                         gpio_free(slot->detect_pin);
1909                         slot->detect_pin = -EBUSY;
1910                 }
1911         }
1912
1913         atmci_init_debugfs(slot);
1914
1915         return 0;
1916 }
1917
1918 static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
1919                 unsigned int id)
1920 {
1921         /* Debugfs stuff is cleaned up by mmc core */
1922
1923         set_bit(ATMCI_SHUTDOWN, &slot->flags);
1924         smp_wmb();
1925
1926         mmc_remove_host(slot->mmc);
1927
1928         if (gpio_is_valid(slot->detect_pin)) {
1929                 int pin = slot->detect_pin;
1930
1931                 free_irq(gpio_to_irq(pin), slot);
1932                 del_timer_sync(&slot->detect_timer);
1933                 gpio_free(pin);
1934         }
1935         if (gpio_is_valid(slot->wp_pin))
1936                 gpio_free(slot->wp_pin);
1937
1938         slot->host->slot[id] = NULL;
1939         mmc_free_host(slot->mmc);
1940 }
1941
1942 static bool atmci_filter(struct dma_chan *chan, void *slave)
1943 {
1944         struct mci_dma_data     *sl = slave;
1945
1946         if (sl && find_slave_dev(sl) == chan->device->dev) {
1947                 chan->private = slave_data_ptr(sl);
1948                 return true;
1949         } else {
1950                 return false;
1951         }
1952 }
1953
1954 static bool atmci_configure_dma(struct atmel_mci *host)
1955 {
1956         struct mci_platform_data        *pdata;
1957
1958         if (host == NULL)
1959                 return false;
1960
1961         pdata = host->pdev->dev.platform_data;
1962
1963         if (pdata && find_slave_dev(pdata->dma_slave)) {
1964                 dma_cap_mask_t mask;
1965
1966                 /* Try to grab a DMA channel */
1967                 dma_cap_zero(mask);
1968                 dma_cap_set(DMA_SLAVE, mask);
1969                 host->dma.chan =
1970                         dma_request_channel(mask, atmci_filter, pdata->dma_slave);
1971         }
1972         if (!host->dma.chan) {
1973                 dev_warn(&host->pdev->dev, "no DMA channel available\n");
1974                 return false;
1975         } else {
1976                 dev_info(&host->pdev->dev,
1977                                         "using %s for DMA transfers\n",
1978                                         dma_chan_name(host->dma.chan));
1979
1980                 host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
1981                 host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1982                 host->dma_conf.src_maxburst = 1;
1983                 host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
1984                 host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
1985                 host->dma_conf.dst_maxburst = 1;
1986                 host->dma_conf.device_fc = false;
1987                 return true;
1988         }
1989 }
1990
1991 static inline unsigned int atmci_get_version(struct atmel_mci *host)
1992 {
1993         return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
1994 }
1995
1996 /*
1997  * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
1998  * HSMCI provides DMA support and a new config register but no more supports
1999  * PDC.
2000  */
2001 static void __init atmci_get_cap(struct atmel_mci *host)
2002 {
2003         unsigned int version;
2004
2005         version = atmci_get_version(host);
2006         dev_info(&host->pdev->dev,
2007                         "version: 0x%x\n", version);
2008
2009         host->caps.has_dma = 0;
2010         host->caps.has_pdc = 0;
2011         host->caps.has_cfg_reg = 0;
2012         host->caps.has_cstor_reg = 0;
2013         host->caps.has_highspeed = 0;
2014         host->caps.has_rwproof = 0;
2015
2016         /* keep only major version number */
2017         switch (version & 0xf00) {
2018         case 0x100:
2019         case 0x200:
2020                 host->caps.has_pdc = 1;
2021                 host->caps.has_rwproof = 1;
2022                 break;
2023         case 0x300:
2024         case 0x400:
2025         case 0x500:
2026 #ifdef CONFIG_AT_HDMAC
2027                 host->caps.has_dma = 1;
2028 #else
2029                 host->caps.has_dma = 0;
2030                 dev_info(&host->pdev->dev,
2031                         "has dma capability but dma engine is not selected, then use pio\n");
2032 #endif
2033                 host->caps.has_cfg_reg = 1;
2034                 host->caps.has_cstor_reg = 1;
2035                 host->caps.has_highspeed = 1;
2036                 host->caps.has_rwproof = 1;
2037                 break;
2038         default:
2039                 dev_warn(&host->pdev->dev,
2040                                 "Unmanaged mci version, set minimum capabilities\n");
2041                 break;
2042         }
2043 }
2044
2045 static int __init atmci_probe(struct platform_device *pdev)
2046 {
2047         struct mci_platform_data        *pdata;
2048         struct atmel_mci                *host;
2049         struct resource                 *regs;
2050         unsigned int                    nr_slots;
2051         int                             irq;
2052         int                             ret;
2053
2054         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2055         if (!regs)
2056                 return -ENXIO;
2057         pdata = pdev->dev.platform_data;
2058         if (!pdata)
2059                 return -ENXIO;
2060         irq = platform_get_irq(pdev, 0);
2061         if (irq < 0)
2062                 return irq;
2063
2064         host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL);
2065         if (!host)
2066                 return -ENOMEM;
2067
2068         host->pdev = pdev;
2069         spin_lock_init(&host->lock);
2070         INIT_LIST_HEAD(&host->queue);
2071
2072         host->mck = clk_get(&pdev->dev, "mci_clk");
2073         if (IS_ERR(host->mck)) {
2074                 ret = PTR_ERR(host->mck);
2075                 goto err_clk_get;
2076         }
2077
2078         ret = -ENOMEM;
2079         host->regs = ioremap(regs->start, resource_size(regs));
2080         if (!host->regs)
2081                 goto err_ioremap;
2082
2083         clk_enable(host->mck);
2084         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2085         host->bus_hz = clk_get_rate(host->mck);
2086         clk_disable(host->mck);
2087
2088         host->mapbase = regs->start;
2089
2090         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2091
2092         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2093         if (ret)
2094                 goto err_request_irq;
2095
2096         /* Get MCI capabilities and set operations according to it */
2097         atmci_get_cap(host);
2098         if (host->caps.has_dma && atmci_configure_dma(host)) {
2099                 host->prepare_data = &atmci_prepare_data_dma;
2100                 host->submit_data = &atmci_submit_data_dma;
2101                 host->stop_transfer = &atmci_stop_transfer_dma;
2102         } else if (host->caps.has_pdc) {
2103                 dev_info(&pdev->dev, "using PDC\n");
2104                 host->prepare_data = &atmci_prepare_data_pdc;
2105                 host->submit_data = &atmci_submit_data_pdc;
2106                 host->stop_transfer = &atmci_stop_transfer_pdc;
2107         } else {
2108                 dev_info(&pdev->dev, "using PIO\n");
2109                 host->prepare_data = &atmci_prepare_data;
2110                 host->submit_data = &atmci_submit_data;
2111                 host->stop_transfer = &atmci_stop_transfer;
2112         }
2113
2114         platform_set_drvdata(pdev, host);
2115
2116         /* We need at least one slot to succeed */
2117         nr_slots = 0;
2118         ret = -ENODEV;
2119         if (pdata->slot[0].bus_width) {
2120                 ret = atmci_init_slot(host, &pdata->slot[0],
2121                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2122                 if (!ret)
2123                         nr_slots++;
2124         }
2125         if (pdata->slot[1].bus_width) {
2126                 ret = atmci_init_slot(host, &pdata->slot[1],
2127                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2128                 if (!ret)
2129                         nr_slots++;
2130         }
2131
2132         if (!nr_slots) {
2133                 dev_err(&pdev->dev, "init failed: no slot defined\n");
2134                 goto err_init_slot;
2135         }
2136
2137         dev_info(&pdev->dev,
2138                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2139                         host->mapbase, irq, nr_slots);
2140
2141         return 0;
2142
2143 err_init_slot:
2144         if (host->dma.chan)
2145                 dma_release_channel(host->dma.chan);
2146         free_irq(irq, host);
2147 err_request_irq:
2148         iounmap(host->regs);
2149 err_ioremap:
2150         clk_put(host->mck);
2151 err_clk_get:
2152         kfree(host);
2153         return ret;
2154 }
2155
2156 static int __exit atmci_remove(struct platform_device *pdev)
2157 {
2158         struct atmel_mci        *host = platform_get_drvdata(pdev);
2159         unsigned int            i;
2160
2161         platform_set_drvdata(pdev, NULL);
2162
2163         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2164                 if (host->slot[i])
2165                         atmci_cleanup_slot(host->slot[i], i);
2166         }
2167
2168         clk_enable(host->mck);
2169         atmci_writel(host, ATMCI_IDR, ~0UL);
2170         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2171         atmci_readl(host, ATMCI_SR);
2172         clk_disable(host->mck);
2173
2174 #ifdef CONFIG_MMC_ATMELMCI_DMA
2175         if (host->dma.chan)
2176                 dma_release_channel(host->dma.chan);
2177 #endif
2178
2179         free_irq(platform_get_irq(pdev, 0), host);
2180         iounmap(host->regs);
2181
2182         clk_put(host->mck);
2183         kfree(host);
2184
2185         return 0;
2186 }
2187
2188 #ifdef CONFIG_PM
2189 static int atmci_suspend(struct device *dev)
2190 {
2191         struct atmel_mci *host = dev_get_drvdata(dev);
2192         int i;
2193
2194          for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2195                 struct atmel_mci_slot *slot = host->slot[i];
2196                 int ret;
2197
2198                 if (!slot)
2199                         continue;
2200                 ret = mmc_suspend_host(slot->mmc);
2201                 if (ret < 0) {
2202                         while (--i >= 0) {
2203                                 slot = host->slot[i];
2204                                 if (slot
2205                                 && test_bit(ATMCI_SUSPENDED, &slot->flags)) {
2206                                         mmc_resume_host(host->slot[i]->mmc);
2207                                         clear_bit(ATMCI_SUSPENDED, &slot->flags);
2208                                 }
2209                         }
2210                         return ret;
2211                 } else {
2212                         set_bit(ATMCI_SUSPENDED, &slot->flags);
2213                 }
2214         }
2215
2216         return 0;
2217 }
2218
2219 static int atmci_resume(struct device *dev)
2220 {
2221         struct atmel_mci *host = dev_get_drvdata(dev);
2222         int i;
2223         int ret = 0;
2224
2225         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2226                 struct atmel_mci_slot *slot = host->slot[i];
2227                 int err;
2228
2229                 slot = host->slot[i];
2230                 if (!slot)
2231                         continue;
2232                 if (!test_bit(ATMCI_SUSPENDED, &slot->flags))
2233                         continue;
2234                 err = mmc_resume_host(slot->mmc);
2235                 if (err < 0)
2236                         ret = err;
2237                 else
2238                         clear_bit(ATMCI_SUSPENDED, &slot->flags);
2239         }
2240
2241         return ret;
2242 }
2243 static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume);
2244 #define ATMCI_PM_OPS    (&atmci_pm)
2245 #else
2246 #define ATMCI_PM_OPS    NULL
2247 #endif
2248
2249 static struct platform_driver atmci_driver = {
2250         .remove         = __exit_p(atmci_remove),
2251         .driver         = {
2252                 .name           = "atmel_mci",
2253                 .pm             = ATMCI_PM_OPS,
2254         },
2255 };
2256
2257 static int __init atmci_init(void)
2258 {
2259         return platform_driver_probe(&atmci_driver, atmci_probe);
2260 }
2261
2262 static void __exit atmci_exit(void)
2263 {
2264         platform_driver_unregister(&atmci_driver);
2265 }
2266
2267 late_initcall(atmci_init); /* try to load after dma driver when built-in */
2268 module_exit(atmci_exit);
2269
2270 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2271 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2272 MODULE_LICENSE("GPL v2");