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7d2be074 HS |
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> | |
deec9ae3 | 12 | #include <linux/debugfs.h> |
7d2be074 | 13 | #include <linux/device.h> |
65e8b083 HS |
14 | #include <linux/dmaengine.h> |
15 | #include <linux/dma-mapping.h> | |
fbfca4b8 | 16 | #include <linux/err.h> |
3c26e170 | 17 | #include <linux/gpio.h> |
7d2be074 HS |
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> | |
deec9ae3 HS |
24 | #include <linux/seq_file.h> |
25 | #include <linux/stat.h> | |
7d2be074 HS |
26 | |
27 | #include <linux/mmc/host.h> | |
c42aa775 | 28 | #include <linux/atmel-mci.h> |
7d2be074 | 29 | |
7d2be074 HS |
30 | #include <asm/io.h> |
31 | #include <asm/unaligned.h> | |
32 | ||
3663b736 | 33 | #include <mach/board.h> |
7d2be074 HS |
34 | |
35 | #include "atmel-mci-regs.h" | |
36 | ||
37 | #define ATMCI_DATA_ERROR_FLAGS (MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE) | |
65e8b083 | 38 | #define ATMCI_DMA_THRESHOLD 16 |
7d2be074 HS |
39 | |
40 | enum { | |
41 | EVENT_CMD_COMPLETE = 0, | |
7d2be074 | 42 | EVENT_XFER_COMPLETE, |
c06ad258 HS |
43 | EVENT_DATA_COMPLETE, |
44 | EVENT_DATA_ERROR, | |
45 | }; | |
46 | ||
47 | enum atmel_mci_state { | |
965ebf33 HS |
48 | STATE_IDLE = 0, |
49 | STATE_SENDING_CMD, | |
c06ad258 HS |
50 | STATE_SENDING_DATA, |
51 | STATE_DATA_BUSY, | |
52 | STATE_SENDING_STOP, | |
53 | STATE_DATA_ERROR, | |
7d2be074 HS |
54 | }; |
55 | ||
65e8b083 HS |
56 | struct atmel_mci_dma { |
57 | #ifdef CONFIG_MMC_ATMELMCI_DMA | |
65e8b083 HS |
58 | struct dma_chan *chan; |
59 | struct dma_async_tx_descriptor *data_desc; | |
60 | #endif | |
61 | }; | |
62 | ||
965ebf33 HS |
63 | /** |
64 | * struct atmel_mci - MMC controller state shared between all slots | |
65 | * @lock: Spinlock protecting the queue and associated data. | |
66 | * @regs: Pointer to MMIO registers. | |
67 | * @sg: Scatterlist entry currently being processed by PIO code, if any. | |
68 | * @pio_offset: Offset into the current scatterlist entry. | |
69 | * @cur_slot: The slot which is currently using the controller. | |
70 | * @mrq: The request currently being processed on @cur_slot, | |
71 | * or NULL if the controller is idle. | |
72 | * @cmd: The command currently being sent to the card, or NULL. | |
73 | * @data: The data currently being transferred, or NULL if no data | |
74 | * transfer is in progress. | |
65e8b083 HS |
75 | * @dma: DMA client state. |
76 | * @data_chan: DMA channel being used for the current data transfer. | |
965ebf33 HS |
77 | * @cmd_status: Snapshot of SR taken upon completion of the current |
78 | * command. Only valid when EVENT_CMD_COMPLETE is pending. | |
79 | * @data_status: Snapshot of SR taken upon completion of the current | |
80 | * data transfer. Only valid when EVENT_DATA_COMPLETE or | |
81 | * EVENT_DATA_ERROR is pending. | |
82 | * @stop_cmdr: Value to be loaded into CMDR when the stop command is | |
83 | * to be sent. | |
84 | * @tasklet: Tasklet running the request state machine. | |
85 | * @pending_events: Bitmask of events flagged by the interrupt handler | |
86 | * to be processed by the tasklet. | |
87 | * @completed_events: Bitmask of events which the state machine has | |
88 | * processed. | |
89 | * @state: Tasklet state. | |
90 | * @queue: List of slots waiting for access to the controller. | |
91 | * @need_clock_update: Update the clock rate before the next request. | |
92 | * @need_reset: Reset controller before next request. | |
93 | * @mode_reg: Value of the MR register. | |
94 | * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus | |
95 | * rate and timeout calculations. | |
96 | * @mapbase: Physical address of the MMIO registers. | |
97 | * @mck: The peripheral bus clock hooked up to the MMC controller. | |
98 | * @pdev: Platform device associated with the MMC controller. | |
99 | * @slot: Slots sharing this MMC controller. | |
100 | * | |
101 | * Locking | |
102 | * ======= | |
103 | * | |
104 | * @lock is a softirq-safe spinlock protecting @queue as well as | |
105 | * @cur_slot, @mrq and @state. These must always be updated | |
106 | * at the same time while holding @lock. | |
107 | * | |
108 | * @lock also protects mode_reg and need_clock_update since these are | |
109 | * used to synchronize mode register updates with the queue | |
110 | * processing. | |
111 | * | |
112 | * The @mrq field of struct atmel_mci_slot is also protected by @lock, | |
113 | * and must always be written at the same time as the slot is added to | |
114 | * @queue. | |
115 | * | |
116 | * @pending_events and @completed_events are accessed using atomic bit | |
117 | * operations, so they don't need any locking. | |
118 | * | |
119 | * None of the fields touched by the interrupt handler need any | |
120 | * locking. However, ordering is important: Before EVENT_DATA_ERROR or | |
121 | * EVENT_DATA_COMPLETE is set in @pending_events, all data-related | |
122 | * interrupts must be disabled and @data_status updated with a | |
123 | * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the | |
124 | * CMDRDY interupt must be disabled and @cmd_status updated with a | |
125 | * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the | |
126 | * bytes_xfered field of @data must be written. This is ensured by | |
127 | * using barriers. | |
128 | */ | |
7d2be074 | 129 | struct atmel_mci { |
965ebf33 | 130 | spinlock_t lock; |
7d2be074 HS |
131 | void __iomem *regs; |
132 | ||
133 | struct scatterlist *sg; | |
134 | unsigned int pio_offset; | |
135 | ||
965ebf33 | 136 | struct atmel_mci_slot *cur_slot; |
7d2be074 HS |
137 | struct mmc_request *mrq; |
138 | struct mmc_command *cmd; | |
139 | struct mmc_data *data; | |
140 | ||
65e8b083 HS |
141 | struct atmel_mci_dma dma; |
142 | struct dma_chan *data_chan; | |
143 | ||
7d2be074 HS |
144 | u32 cmd_status; |
145 | u32 data_status; | |
7d2be074 HS |
146 | u32 stop_cmdr; |
147 | ||
7d2be074 HS |
148 | struct tasklet_struct tasklet; |
149 | unsigned long pending_events; | |
150 | unsigned long completed_events; | |
c06ad258 | 151 | enum atmel_mci_state state; |
965ebf33 | 152 | struct list_head queue; |
7d2be074 | 153 | |
965ebf33 HS |
154 | bool need_clock_update; |
155 | bool need_reset; | |
156 | u32 mode_reg; | |
7d2be074 HS |
157 | unsigned long bus_hz; |
158 | unsigned long mapbase; | |
159 | struct clk *mck; | |
160 | struct platform_device *pdev; | |
965ebf33 HS |
161 | |
162 | struct atmel_mci_slot *slot[ATMEL_MCI_MAX_NR_SLOTS]; | |
163 | }; | |
164 | ||
165 | /** | |
166 | * struct atmel_mci_slot - MMC slot state | |
167 | * @mmc: The mmc_host representing this slot. | |
168 | * @host: The MMC controller this slot is using. | |
169 | * @sdc_reg: Value of SDCR to be written before using this slot. | |
170 | * @mrq: mmc_request currently being processed or waiting to be | |
171 | * processed, or NULL when the slot is idle. | |
172 | * @queue_node: List node for placing this node in the @queue list of | |
173 | * &struct atmel_mci. | |
174 | * @clock: Clock rate configured by set_ios(). Protected by host->lock. | |
175 | * @flags: Random state bits associated with the slot. | |
176 | * @detect_pin: GPIO pin used for card detection, or negative if not | |
177 | * available. | |
178 | * @wp_pin: GPIO pin used for card write protect sending, or negative | |
179 | * if not available. | |
180 | * @detect_timer: Timer used for debouncing @detect_pin interrupts. | |
181 | */ | |
182 | struct atmel_mci_slot { | |
183 | struct mmc_host *mmc; | |
184 | struct atmel_mci *host; | |
185 | ||
186 | u32 sdc_reg; | |
187 | ||
188 | struct mmc_request *mrq; | |
189 | struct list_head queue_node; | |
190 | ||
191 | unsigned int clock; | |
192 | unsigned long flags; | |
193 | #define ATMCI_CARD_PRESENT 0 | |
194 | #define ATMCI_CARD_NEED_INIT 1 | |
195 | #define ATMCI_SHUTDOWN 2 | |
196 | ||
197 | int detect_pin; | |
198 | int wp_pin; | |
199 | ||
200 | struct timer_list detect_timer; | |
7d2be074 HS |
201 | }; |
202 | ||
7d2be074 HS |
203 | #define atmci_test_and_clear_pending(host, event) \ |
204 | test_and_clear_bit(event, &host->pending_events) | |
7d2be074 HS |
205 | #define atmci_set_completed(host, event) \ |
206 | set_bit(event, &host->completed_events) | |
207 | #define atmci_set_pending(host, event) \ | |
208 | set_bit(event, &host->pending_events) | |
7d2be074 | 209 | |
deec9ae3 HS |
210 | /* |
211 | * The debugfs stuff below is mostly optimized away when | |
212 | * CONFIG_DEBUG_FS is not set. | |
213 | */ | |
214 | static int atmci_req_show(struct seq_file *s, void *v) | |
215 | { | |
965ebf33 HS |
216 | struct atmel_mci_slot *slot = s->private; |
217 | struct mmc_request *mrq; | |
deec9ae3 HS |
218 | struct mmc_command *cmd; |
219 | struct mmc_command *stop; | |
220 | struct mmc_data *data; | |
221 | ||
222 | /* Make sure we get a consistent snapshot */ | |
965ebf33 HS |
223 | spin_lock_bh(&slot->host->lock); |
224 | mrq = slot->mrq; | |
deec9ae3 HS |
225 | |
226 | if (mrq) { | |
227 | cmd = mrq->cmd; | |
228 | data = mrq->data; | |
229 | stop = mrq->stop; | |
230 | ||
231 | if (cmd) | |
232 | seq_printf(s, | |
233 | "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", | |
234 | cmd->opcode, cmd->arg, cmd->flags, | |
235 | cmd->resp[0], cmd->resp[1], cmd->resp[2], | |
236 | cmd->resp[2], cmd->error); | |
237 | if (data) | |
238 | seq_printf(s, "DATA %u / %u * %u flg %x err %d\n", | |
239 | data->bytes_xfered, data->blocks, | |
240 | data->blksz, data->flags, data->error); | |
241 | if (stop) | |
242 | seq_printf(s, | |
243 | "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", | |
244 | stop->opcode, stop->arg, stop->flags, | |
245 | stop->resp[0], stop->resp[1], stop->resp[2], | |
246 | stop->resp[2], stop->error); | |
247 | } | |
248 | ||
965ebf33 | 249 | spin_unlock_bh(&slot->host->lock); |
deec9ae3 HS |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static int atmci_req_open(struct inode *inode, struct file *file) | |
255 | { | |
256 | return single_open(file, atmci_req_show, inode->i_private); | |
257 | } | |
258 | ||
259 | static const struct file_operations atmci_req_fops = { | |
260 | .owner = THIS_MODULE, | |
261 | .open = atmci_req_open, | |
262 | .read = seq_read, | |
263 | .llseek = seq_lseek, | |
264 | .release = single_release, | |
265 | }; | |
266 | ||
267 | static void atmci_show_status_reg(struct seq_file *s, | |
268 | const char *regname, u32 value) | |
269 | { | |
270 | static const char *sr_bit[] = { | |
271 | [0] = "CMDRDY", | |
272 | [1] = "RXRDY", | |
273 | [2] = "TXRDY", | |
274 | [3] = "BLKE", | |
275 | [4] = "DTIP", | |
276 | [5] = "NOTBUSY", | |
277 | [8] = "SDIOIRQA", | |
278 | [9] = "SDIOIRQB", | |
279 | [16] = "RINDE", | |
280 | [17] = "RDIRE", | |
281 | [18] = "RCRCE", | |
282 | [19] = "RENDE", | |
283 | [20] = "RTOE", | |
284 | [21] = "DCRCE", | |
285 | [22] = "DTOE", | |
286 | [30] = "OVRE", | |
287 | [31] = "UNRE", | |
288 | }; | |
289 | unsigned int i; | |
290 | ||
291 | seq_printf(s, "%s:\t0x%08x", regname, value); | |
292 | for (i = 0; i < ARRAY_SIZE(sr_bit); i++) { | |
293 | if (value & (1 << i)) { | |
294 | if (sr_bit[i]) | |
295 | seq_printf(s, " %s", sr_bit[i]); | |
296 | else | |
297 | seq_puts(s, " UNKNOWN"); | |
298 | } | |
299 | } | |
300 | seq_putc(s, '\n'); | |
301 | } | |
302 | ||
303 | static int atmci_regs_show(struct seq_file *s, void *v) | |
304 | { | |
305 | struct atmel_mci *host = s->private; | |
306 | u32 *buf; | |
307 | ||
308 | buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL); | |
309 | if (!buf) | |
310 | return -ENOMEM; | |
311 | ||
965ebf33 HS |
312 | /* |
313 | * Grab a more or less consistent snapshot. Note that we're | |
314 | * not disabling interrupts, so IMR and SR may not be | |
315 | * consistent. | |
316 | */ | |
317 | spin_lock_bh(&host->lock); | |
87e60f2b | 318 | clk_enable(host->mck); |
deec9ae3 | 319 | memcpy_fromio(buf, host->regs, MCI_REGS_SIZE); |
87e60f2b | 320 | clk_disable(host->mck); |
965ebf33 | 321 | spin_unlock_bh(&host->lock); |
deec9ae3 HS |
322 | |
323 | seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n", | |
324 | buf[MCI_MR / 4], | |
325 | buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "", | |
326 | buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "", | |
327 | buf[MCI_MR / 4] & 0xff); | |
328 | seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]); | |
329 | seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]); | |
330 | seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]); | |
331 | seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n", | |
332 | buf[MCI_BLKR / 4], | |
333 | buf[MCI_BLKR / 4] & 0xffff, | |
334 | (buf[MCI_BLKR / 4] >> 16) & 0xffff); | |
335 | ||
336 | /* Don't read RSPR and RDR; it will consume the data there */ | |
337 | ||
338 | atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]); | |
339 | atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]); | |
340 | ||
b17339a1 HS |
341 | kfree(buf); |
342 | ||
deec9ae3 HS |
343 | return 0; |
344 | } | |
345 | ||
346 | static int atmci_regs_open(struct inode *inode, struct file *file) | |
347 | { | |
348 | return single_open(file, atmci_regs_show, inode->i_private); | |
349 | } | |
350 | ||
351 | static const struct file_operations atmci_regs_fops = { | |
352 | .owner = THIS_MODULE, | |
353 | .open = atmci_regs_open, | |
354 | .read = seq_read, | |
355 | .llseek = seq_lseek, | |
356 | .release = single_release, | |
357 | }; | |
358 | ||
965ebf33 | 359 | static void atmci_init_debugfs(struct atmel_mci_slot *slot) |
deec9ae3 | 360 | { |
965ebf33 HS |
361 | struct mmc_host *mmc = slot->mmc; |
362 | struct atmel_mci *host = slot->host; | |
363 | struct dentry *root; | |
364 | struct dentry *node; | |
deec9ae3 | 365 | |
deec9ae3 HS |
366 | root = mmc->debugfs_root; |
367 | if (!root) | |
368 | return; | |
369 | ||
370 | node = debugfs_create_file("regs", S_IRUSR, root, host, | |
371 | &atmci_regs_fops); | |
372 | if (IS_ERR(node)) | |
373 | return; | |
374 | if (!node) | |
375 | goto err; | |
376 | ||
965ebf33 | 377 | node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops); |
deec9ae3 HS |
378 | if (!node) |
379 | goto err; | |
380 | ||
c06ad258 HS |
381 | node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state); |
382 | if (!node) | |
383 | goto err; | |
384 | ||
deec9ae3 HS |
385 | node = debugfs_create_x32("pending_events", S_IRUSR, root, |
386 | (u32 *)&host->pending_events); | |
387 | if (!node) | |
388 | goto err; | |
389 | ||
390 | node = debugfs_create_x32("completed_events", S_IRUSR, root, | |
391 | (u32 *)&host->completed_events); | |
392 | if (!node) | |
393 | goto err; | |
394 | ||
395 | return; | |
396 | ||
397 | err: | |
965ebf33 | 398 | dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n"); |
deec9ae3 | 399 | } |
7d2be074 | 400 | |
7d2be074 HS |
401 | static inline unsigned int ns_to_clocks(struct atmel_mci *host, |
402 | unsigned int ns) | |
403 | { | |
404 | return (ns * (host->bus_hz / 1000000) + 999) / 1000; | |
405 | } | |
406 | ||
407 | static void atmci_set_timeout(struct atmel_mci *host, | |
965ebf33 | 408 | struct atmel_mci_slot *slot, struct mmc_data *data) |
7d2be074 HS |
409 | { |
410 | static unsigned dtomul_to_shift[] = { | |
411 | 0, 4, 7, 8, 10, 12, 16, 20 | |
412 | }; | |
413 | unsigned timeout; | |
414 | unsigned dtocyc; | |
415 | unsigned dtomul; | |
416 | ||
417 | timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks; | |
418 | ||
419 | for (dtomul = 0; dtomul < 8; dtomul++) { | |
420 | unsigned shift = dtomul_to_shift[dtomul]; | |
421 | dtocyc = (timeout + (1 << shift) - 1) >> shift; | |
422 | if (dtocyc < 15) | |
423 | break; | |
424 | } | |
425 | ||
426 | if (dtomul >= 8) { | |
427 | dtomul = 7; | |
428 | dtocyc = 15; | |
429 | } | |
430 | ||
965ebf33 | 431 | dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n", |
7d2be074 HS |
432 | dtocyc << dtomul_to_shift[dtomul]); |
433 | mci_writel(host, DTOR, (MCI_DTOMUL(dtomul) | MCI_DTOCYC(dtocyc))); | |
434 | } | |
435 | ||
436 | /* | |
437 | * Return mask with command flags to be enabled for this command. | |
438 | */ | |
439 | static u32 atmci_prepare_command(struct mmc_host *mmc, | |
440 | struct mmc_command *cmd) | |
441 | { | |
442 | struct mmc_data *data; | |
443 | u32 cmdr; | |
444 | ||
445 | cmd->error = -EINPROGRESS; | |
446 | ||
447 | cmdr = MCI_CMDR_CMDNB(cmd->opcode); | |
448 | ||
449 | if (cmd->flags & MMC_RSP_PRESENT) { | |
450 | if (cmd->flags & MMC_RSP_136) | |
451 | cmdr |= MCI_CMDR_RSPTYP_136BIT; | |
452 | else | |
453 | cmdr |= MCI_CMDR_RSPTYP_48BIT; | |
454 | } | |
455 | ||
456 | /* | |
457 | * This should really be MAXLAT_5 for CMD2 and ACMD41, but | |
458 | * it's too difficult to determine whether this is an ACMD or | |
459 | * not. Better make it 64. | |
460 | */ | |
461 | cmdr |= MCI_CMDR_MAXLAT_64CYC; | |
462 | ||
463 | if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN) | |
464 | cmdr |= MCI_CMDR_OPDCMD; | |
465 | ||
466 | data = cmd->data; | |
467 | if (data) { | |
468 | cmdr |= MCI_CMDR_START_XFER; | |
469 | if (data->flags & MMC_DATA_STREAM) | |
470 | cmdr |= MCI_CMDR_STREAM; | |
471 | else if (data->blocks > 1) | |
472 | cmdr |= MCI_CMDR_MULTI_BLOCK; | |
473 | else | |
474 | cmdr |= MCI_CMDR_BLOCK; | |
475 | ||
476 | if (data->flags & MMC_DATA_READ) | |
477 | cmdr |= MCI_CMDR_TRDIR_READ; | |
478 | } | |
479 | ||
480 | return cmdr; | |
481 | } | |
482 | ||
483 | static void atmci_start_command(struct atmel_mci *host, | |
965ebf33 | 484 | struct mmc_command *cmd, u32 cmd_flags) |
7d2be074 | 485 | { |
7d2be074 HS |
486 | WARN_ON(host->cmd); |
487 | host->cmd = cmd; | |
488 | ||
965ebf33 | 489 | dev_vdbg(&host->pdev->dev, |
7d2be074 HS |
490 | "start command: ARGR=0x%08x CMDR=0x%08x\n", |
491 | cmd->arg, cmd_flags); | |
492 | ||
493 | mci_writel(host, ARGR, cmd->arg); | |
494 | mci_writel(host, CMDR, cmd_flags); | |
495 | } | |
496 | ||
965ebf33 | 497 | static void send_stop_cmd(struct atmel_mci *host, struct mmc_data *data) |
7d2be074 | 498 | { |
7d2be074 HS |
499 | atmci_start_command(host, data->stop, host->stop_cmdr); |
500 | mci_writel(host, IER, MCI_CMDRDY); | |
501 | } | |
502 | ||
65e8b083 HS |
503 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
504 | static void atmci_dma_cleanup(struct atmel_mci *host) | |
505 | { | |
506 | struct mmc_data *data = host->data; | |
507 | ||
508 | dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len, | |
509 | ((data->flags & MMC_DATA_WRITE) | |
510 | ? DMA_TO_DEVICE : DMA_FROM_DEVICE)); | |
511 | } | |
512 | ||
513 | static void atmci_stop_dma(struct atmel_mci *host) | |
514 | { | |
515 | struct dma_chan *chan = host->data_chan; | |
516 | ||
517 | if (chan) { | |
518 | chan->device->device_terminate_all(chan); | |
519 | atmci_dma_cleanup(host); | |
520 | } else { | |
521 | /* Data transfer was stopped by the interrupt handler */ | |
522 | atmci_set_pending(host, EVENT_XFER_COMPLETE); | |
523 | mci_writel(host, IER, MCI_NOTBUSY); | |
524 | } | |
525 | } | |
526 | ||
527 | /* This function is called by the DMA driver from tasklet context. */ | |
528 | static void atmci_dma_complete(void *arg) | |
529 | { | |
530 | struct atmel_mci *host = arg; | |
531 | struct mmc_data *data = host->data; | |
532 | ||
533 | dev_vdbg(&host->pdev->dev, "DMA complete\n"); | |
534 | ||
535 | atmci_dma_cleanup(host); | |
536 | ||
537 | /* | |
538 | * If the card was removed, data will be NULL. No point trying | |
539 | * to send the stop command or waiting for NBUSY in this case. | |
540 | */ | |
541 | if (data) { | |
542 | atmci_set_pending(host, EVENT_XFER_COMPLETE); | |
543 | tasklet_schedule(&host->tasklet); | |
544 | ||
545 | /* | |
546 | * Regardless of what the documentation says, we have | |
547 | * to wait for NOTBUSY even after block read | |
548 | * operations. | |
549 | * | |
550 | * When the DMA transfer is complete, the controller | |
551 | * may still be reading the CRC from the card, i.e. | |
552 | * the data transfer is still in progress and we | |
553 | * haven't seen all the potential error bits yet. | |
554 | * | |
555 | * The interrupt handler will schedule a different | |
556 | * tasklet to finish things up when the data transfer | |
557 | * is completely done. | |
558 | * | |
559 | * We may not complete the mmc request here anyway | |
560 | * because the mmc layer may call back and cause us to | |
561 | * violate the "don't submit new operations from the | |
562 | * completion callback" rule of the dma engine | |
563 | * framework. | |
564 | */ | |
565 | mci_writel(host, IER, MCI_NOTBUSY); | |
566 | } | |
567 | } | |
568 | ||
569 | static int | |
570 | atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) | |
571 | { | |
572 | struct dma_chan *chan; | |
573 | struct dma_async_tx_descriptor *desc; | |
574 | struct scatterlist *sg; | |
575 | unsigned int i; | |
576 | enum dma_data_direction direction; | |
577 | ||
578 | /* | |
579 | * We don't do DMA on "complex" transfers, i.e. with | |
580 | * non-word-aligned buffers or lengths. Also, we don't bother | |
581 | * with all the DMA setup overhead for short transfers. | |
582 | */ | |
583 | if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD) | |
584 | return -EINVAL; | |
585 | if (data->blksz & 3) | |
586 | return -EINVAL; | |
587 | ||
588 | for_each_sg(data->sg, sg, data->sg_len, i) { | |
589 | if (sg->offset & 3 || sg->length & 3) | |
590 | return -EINVAL; | |
591 | } | |
592 | ||
593 | /* If we don't have a channel, we can't do DMA */ | |
594 | chan = host->dma.chan; | |
6f49a57a | 595 | if (chan) |
65e8b083 | 596 | host->data_chan = chan; |
65e8b083 HS |
597 | |
598 | if (!chan) | |
599 | return -ENODEV; | |
600 | ||
601 | if (data->flags & MMC_DATA_READ) | |
602 | direction = DMA_FROM_DEVICE; | |
603 | else | |
604 | direction = DMA_TO_DEVICE; | |
605 | ||
606 | desc = chan->device->device_prep_slave_sg(chan, | |
607 | data->sg, data->sg_len, direction, | |
608 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
609 | if (!desc) | |
610 | return -ENOMEM; | |
611 | ||
612 | host->dma.data_desc = desc; | |
613 | desc->callback = atmci_dma_complete; | |
614 | desc->callback_param = host; | |
615 | desc->tx_submit(desc); | |
616 | ||
617 | /* Go! */ | |
618 | chan->device->device_issue_pending(chan); | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
623 | #else /* CONFIG_MMC_ATMELMCI_DMA */ | |
624 | ||
625 | static int atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) | |
626 | { | |
627 | return -ENOSYS; | |
628 | } | |
629 | ||
630 | static void atmci_stop_dma(struct atmel_mci *host) | |
631 | { | |
632 | /* Data transfer was stopped by the interrupt handler */ | |
633 | atmci_set_pending(host, EVENT_XFER_COMPLETE); | |
634 | mci_writel(host, IER, MCI_NOTBUSY); | |
635 | } | |
636 | ||
637 | #endif /* CONFIG_MMC_ATMELMCI_DMA */ | |
638 | ||
7d2be074 HS |
639 | /* |
640 | * Returns a mask of interrupt flags to be enabled after the whole | |
641 | * request has been prepared. | |
642 | */ | |
965ebf33 | 643 | static u32 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data) |
7d2be074 | 644 | { |
965ebf33 | 645 | u32 iflags; |
7d2be074 HS |
646 | |
647 | data->error = -EINPROGRESS; | |
648 | ||
649 | WARN_ON(host->data); | |
650 | host->sg = NULL; | |
651 | host->data = data; | |
652 | ||
7d2be074 | 653 | iflags = ATMCI_DATA_ERROR_FLAGS; |
65e8b083 HS |
654 | if (atmci_submit_data_dma(host, data)) { |
655 | host->data_chan = NULL; | |
965ebf33 | 656 | |
65e8b083 HS |
657 | /* |
658 | * Errata: MMC data write operation with less than 12 | |
659 | * bytes is impossible. | |
660 | * | |
661 | * Errata: MCI Transmit Data Register (TDR) FIFO | |
662 | * corruption when length is not multiple of 4. | |
663 | */ | |
664 | if (data->blocks * data->blksz < 12 | |
665 | || (data->blocks * data->blksz) & 3) | |
666 | host->need_reset = true; | |
965ebf33 | 667 | |
65e8b083 HS |
668 | host->sg = data->sg; |
669 | host->pio_offset = 0; | |
670 | if (data->flags & MMC_DATA_READ) | |
671 | iflags |= MCI_RXRDY; | |
672 | else | |
673 | iflags |= MCI_TXRDY; | |
674 | } | |
7d2be074 HS |
675 | |
676 | return iflags; | |
677 | } | |
678 | ||
965ebf33 HS |
679 | static void atmci_start_request(struct atmel_mci *host, |
680 | struct atmel_mci_slot *slot) | |
7d2be074 | 681 | { |
965ebf33 | 682 | struct mmc_request *mrq; |
7d2be074 | 683 | struct mmc_command *cmd; |
965ebf33 | 684 | struct mmc_data *data; |
7d2be074 | 685 | u32 iflags; |
965ebf33 | 686 | u32 cmdflags; |
7d2be074 | 687 | |
965ebf33 HS |
688 | mrq = slot->mrq; |
689 | host->cur_slot = slot; | |
7d2be074 | 690 | host->mrq = mrq; |
965ebf33 | 691 | |
7d2be074 HS |
692 | host->pending_events = 0; |
693 | host->completed_events = 0; | |
ca55f46e | 694 | host->data_status = 0; |
7d2be074 | 695 | |
965ebf33 HS |
696 | if (host->need_reset) { |
697 | mci_writel(host, CR, MCI_CR_SWRST); | |
698 | mci_writel(host, CR, MCI_CR_MCIEN); | |
699 | mci_writel(host, MR, host->mode_reg); | |
700 | host->need_reset = false; | |
701 | } | |
702 | mci_writel(host, SDCR, slot->sdc_reg); | |
703 | ||
704 | iflags = mci_readl(host, IMR); | |
705 | if (iflags) | |
706 | dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n", | |
707 | iflags); | |
708 | ||
709 | if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) { | |
710 | /* Send init sequence (74 clock cycles) */ | |
711 | mci_writel(host, CMDR, MCI_CMDR_SPCMD_INIT); | |
712 | while (!(mci_readl(host, SR) & MCI_CMDRDY)) | |
713 | cpu_relax(); | |
714 | } | |
7d2be074 HS |
715 | data = mrq->data; |
716 | if (data) { | |
965ebf33 | 717 | atmci_set_timeout(host, slot, data); |
a252e3e3 HS |
718 | |
719 | /* Must set block count/size before sending command */ | |
720 | mci_writel(host, BLKR, MCI_BCNT(data->blocks) | |
721 | | MCI_BLKLEN(data->blksz)); | |
965ebf33 HS |
722 | dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n", |
723 | MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz)); | |
7d2be074 HS |
724 | } |
725 | ||
726 | iflags = MCI_CMDRDY; | |
727 | cmd = mrq->cmd; | |
965ebf33 | 728 | cmdflags = atmci_prepare_command(slot->mmc, cmd); |
7d2be074 HS |
729 | atmci_start_command(host, cmd, cmdflags); |
730 | ||
731 | if (data) | |
965ebf33 | 732 | iflags |= atmci_submit_data(host, data); |
7d2be074 HS |
733 | |
734 | if (mrq->stop) { | |
965ebf33 | 735 | host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop); |
7d2be074 HS |
736 | host->stop_cmdr |= MCI_CMDR_STOP_XFER; |
737 | if (!(data->flags & MMC_DATA_WRITE)) | |
738 | host->stop_cmdr |= MCI_CMDR_TRDIR_READ; | |
739 | if (data->flags & MMC_DATA_STREAM) | |
740 | host->stop_cmdr |= MCI_CMDR_STREAM; | |
741 | else | |
742 | host->stop_cmdr |= MCI_CMDR_MULTI_BLOCK; | |
743 | } | |
744 | ||
745 | /* | |
746 | * We could have enabled interrupts earlier, but I suspect | |
747 | * that would open up a nice can of interesting race | |
748 | * conditions (e.g. command and data complete, but stop not | |
749 | * prepared yet.) | |
750 | */ | |
751 | mci_writel(host, IER, iflags); | |
965ebf33 | 752 | } |
7d2be074 | 753 | |
965ebf33 HS |
754 | static void atmci_queue_request(struct atmel_mci *host, |
755 | struct atmel_mci_slot *slot, struct mmc_request *mrq) | |
756 | { | |
757 | dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n", | |
758 | host->state); | |
759 | ||
760 | spin_lock_bh(&host->lock); | |
761 | slot->mrq = mrq; | |
762 | if (host->state == STATE_IDLE) { | |
763 | host->state = STATE_SENDING_CMD; | |
764 | atmci_start_request(host, slot); | |
765 | } else { | |
766 | list_add_tail(&slot->queue_node, &host->queue); | |
767 | } | |
768 | spin_unlock_bh(&host->lock); | |
769 | } | |
7d2be074 | 770 | |
965ebf33 HS |
771 | static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq) |
772 | { | |
773 | struct atmel_mci_slot *slot = mmc_priv(mmc); | |
774 | struct atmel_mci *host = slot->host; | |
775 | struct mmc_data *data; | |
776 | ||
777 | WARN_ON(slot->mrq); | |
778 | ||
779 | /* | |
780 | * We may "know" the card is gone even though there's still an | |
781 | * electrical connection. If so, we really need to communicate | |
782 | * this to the MMC core since there won't be any more | |
783 | * interrupts as the card is completely removed. Otherwise, | |
784 | * the MMC core might believe the card is still there even | |
785 | * though the card was just removed very slowly. | |
786 | */ | |
787 | if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) { | |
788 | mrq->cmd->error = -ENOMEDIUM; | |
789 | mmc_request_done(mmc, mrq); | |
790 | return; | |
791 | } | |
792 | ||
793 | /* We don't support multiple blocks of weird lengths. */ | |
794 | data = mrq->data; | |
795 | if (data && data->blocks > 1 && data->blksz & 3) { | |
796 | mrq->cmd->error = -EINVAL; | |
797 | mmc_request_done(mmc, mrq); | |
798 | } | |
799 | ||
800 | atmci_queue_request(host, slot, mrq); | |
7d2be074 HS |
801 | } |
802 | ||
803 | static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) | |
804 | { | |
965ebf33 HS |
805 | struct atmel_mci_slot *slot = mmc_priv(mmc); |
806 | struct atmel_mci *host = slot->host; | |
807 | unsigned int i; | |
7d2be074 | 808 | |
965ebf33 | 809 | slot->sdc_reg &= ~MCI_SDCBUS_MASK; |
945533b5 HS |
810 | switch (ios->bus_width) { |
811 | case MMC_BUS_WIDTH_1: | |
965ebf33 | 812 | slot->sdc_reg |= MCI_SDCBUS_1BIT; |
945533b5 HS |
813 | break; |
814 | case MMC_BUS_WIDTH_4: | |
965ebf33 | 815 | slot->sdc_reg = MCI_SDCBUS_4BIT; |
945533b5 HS |
816 | break; |
817 | } | |
818 | ||
7d2be074 | 819 | if (ios->clock) { |
965ebf33 | 820 | unsigned int clock_min = ~0U; |
7d2be074 HS |
821 | u32 clkdiv; |
822 | ||
965ebf33 HS |
823 | spin_lock_bh(&host->lock); |
824 | if (!host->mode_reg) { | |
945533b5 | 825 | clk_enable(host->mck); |
965ebf33 HS |
826 | mci_writel(host, CR, MCI_CR_SWRST); |
827 | mci_writel(host, CR, MCI_CR_MCIEN); | |
828 | } | |
945533b5 | 829 | |
965ebf33 HS |
830 | /* |
831 | * Use mirror of ios->clock to prevent race with mmc | |
832 | * core ios update when finding the minimum. | |
833 | */ | |
834 | slot->clock = ios->clock; | |
835 | for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { | |
836 | if (host->slot[i] && host->slot[i]->clock | |
837 | && host->slot[i]->clock < clock_min) | |
838 | clock_min = host->slot[i]->clock; | |
839 | } | |
840 | ||
841 | /* Calculate clock divider */ | |
842 | clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1; | |
7d2be074 HS |
843 | if (clkdiv > 255) { |
844 | dev_warn(&mmc->class_dev, | |
845 | "clock %u too slow; using %lu\n", | |
965ebf33 | 846 | clock_min, host->bus_hz / (2 * 256)); |
7d2be074 HS |
847 | clkdiv = 255; |
848 | } | |
849 | ||
965ebf33 HS |
850 | /* |
851 | * WRPROOF and RDPROOF prevent overruns/underruns by | |
852 | * stopping the clock when the FIFO is full/empty. | |
853 | * This state is not expected to last for long. | |
854 | */ | |
7d2be074 HS |
855 | host->mode_reg = MCI_MR_CLKDIV(clkdiv) | MCI_MR_WRPROOF |
856 | | MCI_MR_RDPROOF; | |
7d2be074 | 857 | |
965ebf33 HS |
858 | if (list_empty(&host->queue)) |
859 | mci_writel(host, MR, host->mode_reg); | |
860 | else | |
861 | host->need_clock_update = true; | |
862 | ||
863 | spin_unlock_bh(&host->lock); | |
945533b5 | 864 | } else { |
965ebf33 HS |
865 | bool any_slot_active = false; |
866 | ||
867 | spin_lock_bh(&host->lock); | |
868 | slot->clock = 0; | |
869 | for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { | |
870 | if (host->slot[i] && host->slot[i]->clock) { | |
871 | any_slot_active = true; | |
872 | break; | |
873 | } | |
945533b5 | 874 | } |
965ebf33 HS |
875 | if (!any_slot_active) { |
876 | mci_writel(host, CR, MCI_CR_MCIDIS); | |
877 | if (host->mode_reg) { | |
878 | mci_readl(host, MR); | |
879 | clk_disable(host->mck); | |
880 | } | |
881 | host->mode_reg = 0; | |
882 | } | |
883 | spin_unlock_bh(&host->lock); | |
7d2be074 HS |
884 | } |
885 | ||
886 | switch (ios->power_mode) { | |
965ebf33 HS |
887 | case MMC_POWER_UP: |
888 | set_bit(ATMCI_CARD_NEED_INIT, &slot->flags); | |
889 | break; | |
7d2be074 HS |
890 | default: |
891 | /* | |
892 | * TODO: None of the currently available AVR32-based | |
893 | * boards allow MMC power to be turned off. Implement | |
894 | * power control when this can be tested properly. | |
965ebf33 HS |
895 | * |
896 | * We also need to hook this into the clock management | |
897 | * somehow so that newly inserted cards aren't | |
898 | * subjected to a fast clock before we have a chance | |
899 | * to figure out what the maximum rate is. Currently, | |
900 | * there's no way to avoid this, and there never will | |
901 | * be for boards that don't support power control. | |
7d2be074 HS |
902 | */ |
903 | break; | |
904 | } | |
905 | } | |
906 | ||
907 | static int atmci_get_ro(struct mmc_host *mmc) | |
908 | { | |
965ebf33 HS |
909 | int read_only = -ENOSYS; |
910 | struct atmel_mci_slot *slot = mmc_priv(mmc); | |
7d2be074 | 911 | |
965ebf33 HS |
912 | if (gpio_is_valid(slot->wp_pin)) { |
913 | read_only = gpio_get_value(slot->wp_pin); | |
7d2be074 HS |
914 | dev_dbg(&mmc->class_dev, "card is %s\n", |
915 | read_only ? "read-only" : "read-write"); | |
7d2be074 HS |
916 | } |
917 | ||
918 | return read_only; | |
919 | } | |
920 | ||
965ebf33 HS |
921 | static int atmci_get_cd(struct mmc_host *mmc) |
922 | { | |
923 | int present = -ENOSYS; | |
924 | struct atmel_mci_slot *slot = mmc_priv(mmc); | |
925 | ||
926 | if (gpio_is_valid(slot->detect_pin)) { | |
927 | present = !gpio_get_value(slot->detect_pin); | |
928 | dev_dbg(&mmc->class_dev, "card is %spresent\n", | |
929 | present ? "" : "not "); | |
930 | } | |
931 | ||
932 | return present; | |
933 | } | |
934 | ||
935 | static const struct mmc_host_ops atmci_ops = { | |
7d2be074 HS |
936 | .request = atmci_request, |
937 | .set_ios = atmci_set_ios, | |
938 | .get_ro = atmci_get_ro, | |
965ebf33 | 939 | .get_cd = atmci_get_cd, |
7d2be074 HS |
940 | }; |
941 | ||
965ebf33 HS |
942 | /* Called with host->lock held */ |
943 | static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq) | |
944 | __releases(&host->lock) | |
945 | __acquires(&host->lock) | |
946 | { | |
947 | struct atmel_mci_slot *slot = NULL; | |
948 | struct mmc_host *prev_mmc = host->cur_slot->mmc; | |
949 | ||
950 | WARN_ON(host->cmd || host->data); | |
951 | ||
952 | /* | |
953 | * Update the MMC clock rate if necessary. This may be | |
954 | * necessary if set_ios() is called when a different slot is | |
955 | * busy transfering data. | |
956 | */ | |
957 | if (host->need_clock_update) | |
958 | mci_writel(host, MR, host->mode_reg); | |
959 | ||
960 | host->cur_slot->mrq = NULL; | |
961 | host->mrq = NULL; | |
962 | if (!list_empty(&host->queue)) { | |
963 | slot = list_entry(host->queue.next, | |
964 | struct atmel_mci_slot, queue_node); | |
965 | list_del(&slot->queue_node); | |
966 | dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n", | |
967 | mmc_hostname(slot->mmc)); | |
968 | host->state = STATE_SENDING_CMD; | |
969 | atmci_start_request(host, slot); | |
970 | } else { | |
971 | dev_vdbg(&host->pdev->dev, "list empty\n"); | |
972 | host->state = STATE_IDLE; | |
973 | } | |
974 | ||
975 | spin_unlock(&host->lock); | |
976 | mmc_request_done(prev_mmc, mrq); | |
977 | spin_lock(&host->lock); | |
978 | } | |
979 | ||
7d2be074 | 980 | static void atmci_command_complete(struct atmel_mci *host, |
c06ad258 | 981 | struct mmc_command *cmd) |
7d2be074 | 982 | { |
c06ad258 HS |
983 | u32 status = host->cmd_status; |
984 | ||
7d2be074 HS |
985 | /* Read the response from the card (up to 16 bytes) */ |
986 | cmd->resp[0] = mci_readl(host, RSPR); | |
987 | cmd->resp[1] = mci_readl(host, RSPR); | |
988 | cmd->resp[2] = mci_readl(host, RSPR); | |
989 | cmd->resp[3] = mci_readl(host, RSPR); | |
990 | ||
991 | if (status & MCI_RTOE) | |
992 | cmd->error = -ETIMEDOUT; | |
993 | else if ((cmd->flags & MMC_RSP_CRC) && (status & MCI_RCRCE)) | |
994 | cmd->error = -EILSEQ; | |
995 | else if (status & (MCI_RINDE | MCI_RDIRE | MCI_RENDE)) | |
996 | cmd->error = -EIO; | |
997 | else | |
998 | cmd->error = 0; | |
999 | ||
1000 | if (cmd->error) { | |
965ebf33 | 1001 | dev_dbg(&host->pdev->dev, |
7d2be074 HS |
1002 | "command error: status=0x%08x\n", status); |
1003 | ||
1004 | if (cmd->data) { | |
1005 | host->data = NULL; | |
65e8b083 | 1006 | atmci_stop_dma(host); |
7d2be074 HS |
1007 | mci_writel(host, IDR, MCI_NOTBUSY |
1008 | | MCI_TXRDY | MCI_RXRDY | |
1009 | | ATMCI_DATA_ERROR_FLAGS); | |
1010 | } | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | static void atmci_detect_change(unsigned long data) | |
1015 | { | |
965ebf33 HS |
1016 | struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data; |
1017 | bool present; | |
1018 | bool present_old; | |
7d2be074 HS |
1019 | |
1020 | /* | |
965ebf33 HS |
1021 | * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before |
1022 | * freeing the interrupt. We must not re-enable the interrupt | |
1023 | * if it has been freed, and if we're shutting down, it | |
1024 | * doesn't really matter whether the card is present or not. | |
7d2be074 HS |
1025 | */ |
1026 | smp_rmb(); | |
965ebf33 | 1027 | if (test_bit(ATMCI_SHUTDOWN, &slot->flags)) |
7d2be074 HS |
1028 | return; |
1029 | ||
965ebf33 HS |
1030 | enable_irq(gpio_to_irq(slot->detect_pin)); |
1031 | present = !gpio_get_value(slot->detect_pin); | |
1032 | present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags); | |
7d2be074 | 1033 | |
965ebf33 HS |
1034 | dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n", |
1035 | present, present_old); | |
7d2be074 | 1036 | |
965ebf33 HS |
1037 | if (present != present_old) { |
1038 | struct atmel_mci *host = slot->host; | |
1039 | struct mmc_request *mrq; | |
1040 | ||
1041 | dev_dbg(&slot->mmc->class_dev, "card %s\n", | |
7d2be074 | 1042 | present ? "inserted" : "removed"); |
7d2be074 | 1043 | |
965ebf33 HS |
1044 | spin_lock(&host->lock); |
1045 | ||
1046 | if (!present) | |
1047 | clear_bit(ATMCI_CARD_PRESENT, &slot->flags); | |
1048 | else | |
1049 | set_bit(ATMCI_CARD_PRESENT, &slot->flags); | |
7d2be074 HS |
1050 | |
1051 | /* Clean up queue if present */ | |
965ebf33 | 1052 | mrq = slot->mrq; |
7d2be074 | 1053 | if (mrq) { |
965ebf33 HS |
1054 | if (mrq == host->mrq) { |
1055 | /* | |
1056 | * Reset controller to terminate any ongoing | |
1057 | * commands or data transfers. | |
1058 | */ | |
1059 | mci_writel(host, CR, MCI_CR_SWRST); | |
1060 | mci_writel(host, CR, MCI_CR_MCIEN); | |
1061 | mci_writel(host, MR, host->mode_reg); | |
1062 | ||
1063 | host->data = NULL; | |
1064 | host->cmd = NULL; | |
1065 | ||
1066 | switch (host->state) { | |
1067 | case STATE_IDLE: | |
c06ad258 | 1068 | break; |
965ebf33 HS |
1069 | case STATE_SENDING_CMD: |
1070 | mrq->cmd->error = -ENOMEDIUM; | |
1071 | if (!mrq->data) | |
1072 | break; | |
1073 | /* fall through */ | |
1074 | case STATE_SENDING_DATA: | |
c06ad258 | 1075 | mrq->data->error = -ENOMEDIUM; |
65e8b083 | 1076 | atmci_stop_dma(host); |
c06ad258 | 1077 | break; |
965ebf33 HS |
1078 | case STATE_DATA_BUSY: |
1079 | case STATE_DATA_ERROR: | |
1080 | if (mrq->data->error == -EINPROGRESS) | |
1081 | mrq->data->error = -ENOMEDIUM; | |
1082 | if (!mrq->stop) | |
1083 | break; | |
1084 | /* fall through */ | |
1085 | case STATE_SENDING_STOP: | |
1086 | mrq->stop->error = -ENOMEDIUM; | |
1087 | break; | |
1088 | } | |
7d2be074 | 1089 | |
965ebf33 HS |
1090 | atmci_request_end(host, mrq); |
1091 | } else { | |
1092 | list_del(&slot->queue_node); | |
1093 | mrq->cmd->error = -ENOMEDIUM; | |
1094 | if (mrq->data) | |
1095 | mrq->data->error = -ENOMEDIUM; | |
1096 | if (mrq->stop) | |
1097 | mrq->stop->error = -ENOMEDIUM; | |
1098 | ||
1099 | spin_unlock(&host->lock); | |
1100 | mmc_request_done(slot->mmc, mrq); | |
1101 | spin_lock(&host->lock); | |
1102 | } | |
7d2be074 | 1103 | } |
965ebf33 | 1104 | spin_unlock(&host->lock); |
7d2be074 | 1105 | |
965ebf33 | 1106 | mmc_detect_change(slot->mmc, 0); |
7d2be074 HS |
1107 | } |
1108 | } | |
1109 | ||
1110 | static void atmci_tasklet_func(unsigned long priv) | |
1111 | { | |
965ebf33 | 1112 | struct atmel_mci *host = (struct atmel_mci *)priv; |
7d2be074 HS |
1113 | struct mmc_request *mrq = host->mrq; |
1114 | struct mmc_data *data = host->data; | |
c06ad258 HS |
1115 | struct mmc_command *cmd = host->cmd; |
1116 | enum atmel_mci_state state = host->state; | |
1117 | enum atmel_mci_state prev_state; | |
1118 | u32 status; | |
1119 | ||
965ebf33 HS |
1120 | spin_lock(&host->lock); |
1121 | ||
c06ad258 | 1122 | state = host->state; |
7d2be074 | 1123 | |
965ebf33 | 1124 | dev_vdbg(&host->pdev->dev, |
c06ad258 HS |
1125 | "tasklet: state %u pending/completed/mask %lx/%lx/%x\n", |
1126 | state, host->pending_events, host->completed_events, | |
7d2be074 HS |
1127 | mci_readl(host, IMR)); |
1128 | ||
c06ad258 HS |
1129 | do { |
1130 | prev_state = state; | |
7d2be074 | 1131 | |
c06ad258 | 1132 | switch (state) { |
965ebf33 HS |
1133 | case STATE_IDLE: |
1134 | break; | |
1135 | ||
c06ad258 HS |
1136 | case STATE_SENDING_CMD: |
1137 | if (!atmci_test_and_clear_pending(host, | |
1138 | EVENT_CMD_COMPLETE)) | |
1139 | break; | |
7d2be074 | 1140 | |
c06ad258 HS |
1141 | host->cmd = NULL; |
1142 | atmci_set_completed(host, EVENT_CMD_COMPLETE); | |
1143 | atmci_command_complete(host, mrq->cmd); | |
1144 | if (!mrq->data || cmd->error) { | |
965ebf33 HS |
1145 | atmci_request_end(host, host->mrq); |
1146 | goto unlock; | |
c06ad258 | 1147 | } |
7d2be074 | 1148 | |
c06ad258 HS |
1149 | prev_state = state = STATE_SENDING_DATA; |
1150 | /* fall through */ | |
7d2be074 | 1151 | |
c06ad258 HS |
1152 | case STATE_SENDING_DATA: |
1153 | if (atmci_test_and_clear_pending(host, | |
1154 | EVENT_DATA_ERROR)) { | |
65e8b083 | 1155 | atmci_stop_dma(host); |
c06ad258 | 1156 | if (data->stop) |
965ebf33 | 1157 | send_stop_cmd(host, data); |
c06ad258 HS |
1158 | state = STATE_DATA_ERROR; |
1159 | break; | |
1160 | } | |
7d2be074 | 1161 | |
c06ad258 HS |
1162 | if (!atmci_test_and_clear_pending(host, |
1163 | EVENT_XFER_COMPLETE)) | |
1164 | break; | |
7d2be074 | 1165 | |
c06ad258 HS |
1166 | atmci_set_completed(host, EVENT_XFER_COMPLETE); |
1167 | prev_state = state = STATE_DATA_BUSY; | |
1168 | /* fall through */ | |
7d2be074 | 1169 | |
c06ad258 HS |
1170 | case STATE_DATA_BUSY: |
1171 | if (!atmci_test_and_clear_pending(host, | |
1172 | EVENT_DATA_COMPLETE)) | |
1173 | break; | |
1174 | ||
1175 | host->data = NULL; | |
1176 | atmci_set_completed(host, EVENT_DATA_COMPLETE); | |
1177 | status = host->data_status; | |
1178 | if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) { | |
1179 | if (status & MCI_DTOE) { | |
965ebf33 | 1180 | dev_dbg(&host->pdev->dev, |
c06ad258 HS |
1181 | "data timeout error\n"); |
1182 | data->error = -ETIMEDOUT; | |
1183 | } else if (status & MCI_DCRCE) { | |
965ebf33 | 1184 | dev_dbg(&host->pdev->dev, |
c06ad258 HS |
1185 | "data CRC error\n"); |
1186 | data->error = -EILSEQ; | |
1187 | } else { | |
965ebf33 | 1188 | dev_dbg(&host->pdev->dev, |
c06ad258 HS |
1189 | "data FIFO error (status=%08x)\n", |
1190 | status); | |
1191 | data->error = -EIO; | |
1192 | } | |
1193 | } else { | |
1194 | data->bytes_xfered = data->blocks * data->blksz; | |
1195 | data->error = 0; | |
1196 | } | |
1197 | ||
1198 | if (!data->stop) { | |
965ebf33 HS |
1199 | atmci_request_end(host, host->mrq); |
1200 | goto unlock; | |
c06ad258 | 1201 | } |
7d2be074 | 1202 | |
c06ad258 HS |
1203 | prev_state = state = STATE_SENDING_STOP; |
1204 | if (!data->error) | |
965ebf33 | 1205 | send_stop_cmd(host, data); |
c06ad258 HS |
1206 | /* fall through */ |
1207 | ||
1208 | case STATE_SENDING_STOP: | |
1209 | if (!atmci_test_and_clear_pending(host, | |
1210 | EVENT_CMD_COMPLETE)) | |
1211 | break; | |
1212 | ||
1213 | host->cmd = NULL; | |
1214 | atmci_command_complete(host, mrq->stop); | |
965ebf33 HS |
1215 | atmci_request_end(host, host->mrq); |
1216 | goto unlock; | |
c06ad258 HS |
1217 | |
1218 | case STATE_DATA_ERROR: | |
1219 | if (!atmci_test_and_clear_pending(host, | |
1220 | EVENT_XFER_COMPLETE)) | |
1221 | break; | |
1222 | ||
1223 | state = STATE_DATA_BUSY; | |
1224 | break; | |
1225 | } | |
1226 | } while (state != prev_state); | |
1227 | ||
1228 | host->state = state; | |
965ebf33 HS |
1229 | |
1230 | unlock: | |
1231 | spin_unlock(&host->lock); | |
7d2be074 HS |
1232 | } |
1233 | ||
1234 | static void atmci_read_data_pio(struct atmel_mci *host) | |
1235 | { | |
1236 | struct scatterlist *sg = host->sg; | |
1237 | void *buf = sg_virt(sg); | |
1238 | unsigned int offset = host->pio_offset; | |
1239 | struct mmc_data *data = host->data; | |
1240 | u32 value; | |
1241 | u32 status; | |
1242 | unsigned int nbytes = 0; | |
1243 | ||
1244 | do { | |
1245 | value = mci_readl(host, RDR); | |
1246 | if (likely(offset + 4 <= sg->length)) { | |
1247 | put_unaligned(value, (u32 *)(buf + offset)); | |
1248 | ||
1249 | offset += 4; | |
1250 | nbytes += 4; | |
1251 | ||
1252 | if (offset == sg->length) { | |
5e7184ae | 1253 | flush_dcache_page(sg_page(sg)); |
7d2be074 HS |
1254 | host->sg = sg = sg_next(sg); |
1255 | if (!sg) | |
1256 | goto done; | |
1257 | ||
1258 | offset = 0; | |
1259 | buf = sg_virt(sg); | |
1260 | } | |
1261 | } else { | |
1262 | unsigned int remaining = sg->length - offset; | |
1263 | memcpy(buf + offset, &value, remaining); | |
1264 | nbytes += remaining; | |
1265 | ||
1266 | flush_dcache_page(sg_page(sg)); | |
1267 | host->sg = sg = sg_next(sg); | |
1268 | if (!sg) | |
1269 | goto done; | |
1270 | ||
1271 | offset = 4 - remaining; | |
1272 | buf = sg_virt(sg); | |
1273 | memcpy(buf, (u8 *)&value + remaining, offset); | |
1274 | nbytes += offset; | |
1275 | } | |
1276 | ||
1277 | status = mci_readl(host, SR); | |
1278 | if (status & ATMCI_DATA_ERROR_FLAGS) { | |
1279 | mci_writel(host, IDR, (MCI_NOTBUSY | MCI_RXRDY | |
1280 | | ATMCI_DATA_ERROR_FLAGS)); | |
1281 | host->data_status = status; | |
965ebf33 HS |
1282 | data->bytes_xfered += nbytes; |
1283 | smp_wmb(); | |
7d2be074 HS |
1284 | atmci_set_pending(host, EVENT_DATA_ERROR); |
1285 | tasklet_schedule(&host->tasklet); | |
965ebf33 | 1286 | return; |
7d2be074 HS |
1287 | } |
1288 | } while (status & MCI_RXRDY); | |
1289 | ||
1290 | host->pio_offset = offset; | |
1291 | data->bytes_xfered += nbytes; | |
1292 | ||
1293 | return; | |
1294 | ||
1295 | done: | |
1296 | mci_writel(host, IDR, MCI_RXRDY); | |
1297 | mci_writel(host, IER, MCI_NOTBUSY); | |
1298 | data->bytes_xfered += nbytes; | |
965ebf33 | 1299 | smp_wmb(); |
c06ad258 | 1300 | atmci_set_pending(host, EVENT_XFER_COMPLETE); |
7d2be074 HS |
1301 | } |
1302 | ||
1303 | static void atmci_write_data_pio(struct atmel_mci *host) | |
1304 | { | |
1305 | struct scatterlist *sg = host->sg; | |
1306 | void *buf = sg_virt(sg); | |
1307 | unsigned int offset = host->pio_offset; | |
1308 | struct mmc_data *data = host->data; | |
1309 | u32 value; | |
1310 | u32 status; | |
1311 | unsigned int nbytes = 0; | |
1312 | ||
1313 | do { | |
1314 | if (likely(offset + 4 <= sg->length)) { | |
1315 | value = get_unaligned((u32 *)(buf + offset)); | |
1316 | mci_writel(host, TDR, value); | |
1317 | ||
1318 | offset += 4; | |
1319 | nbytes += 4; | |
1320 | if (offset == sg->length) { | |
1321 | host->sg = sg = sg_next(sg); | |
1322 | if (!sg) | |
1323 | goto done; | |
1324 | ||
1325 | offset = 0; | |
1326 | buf = sg_virt(sg); | |
1327 | } | |
1328 | } else { | |
1329 | unsigned int remaining = sg->length - offset; | |
1330 | ||
1331 | value = 0; | |
1332 | memcpy(&value, buf + offset, remaining); | |
1333 | nbytes += remaining; | |
1334 | ||
1335 | host->sg = sg = sg_next(sg); | |
1336 | if (!sg) { | |
1337 | mci_writel(host, TDR, value); | |
1338 | goto done; | |
1339 | } | |
1340 | ||
1341 | offset = 4 - remaining; | |
1342 | buf = sg_virt(sg); | |
1343 | memcpy((u8 *)&value + remaining, buf, offset); | |
1344 | mci_writel(host, TDR, value); | |
1345 | nbytes += offset; | |
1346 | } | |
1347 | ||
1348 | status = mci_readl(host, SR); | |
1349 | if (status & ATMCI_DATA_ERROR_FLAGS) { | |
1350 | mci_writel(host, IDR, (MCI_NOTBUSY | MCI_TXRDY | |
1351 | | ATMCI_DATA_ERROR_FLAGS)); | |
1352 | host->data_status = status; | |
965ebf33 HS |
1353 | data->bytes_xfered += nbytes; |
1354 | smp_wmb(); | |
7d2be074 HS |
1355 | atmci_set_pending(host, EVENT_DATA_ERROR); |
1356 | tasklet_schedule(&host->tasklet); | |
965ebf33 | 1357 | return; |
7d2be074 HS |
1358 | } |
1359 | } while (status & MCI_TXRDY); | |
1360 | ||
1361 | host->pio_offset = offset; | |
1362 | data->bytes_xfered += nbytes; | |
1363 | ||
1364 | return; | |
1365 | ||
1366 | done: | |
1367 | mci_writel(host, IDR, MCI_TXRDY); | |
1368 | mci_writel(host, IER, MCI_NOTBUSY); | |
1369 | data->bytes_xfered += nbytes; | |
965ebf33 | 1370 | smp_wmb(); |
c06ad258 | 1371 | atmci_set_pending(host, EVENT_XFER_COMPLETE); |
7d2be074 HS |
1372 | } |
1373 | ||
965ebf33 | 1374 | static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status) |
7d2be074 | 1375 | { |
7d2be074 HS |
1376 | mci_writel(host, IDR, MCI_CMDRDY); |
1377 | ||
c06ad258 | 1378 | host->cmd_status = status; |
965ebf33 | 1379 | smp_wmb(); |
c06ad258 | 1380 | atmci_set_pending(host, EVENT_CMD_COMPLETE); |
7d2be074 HS |
1381 | tasklet_schedule(&host->tasklet); |
1382 | } | |
1383 | ||
1384 | static irqreturn_t atmci_interrupt(int irq, void *dev_id) | |
1385 | { | |
965ebf33 | 1386 | struct atmel_mci *host = dev_id; |
7d2be074 HS |
1387 | u32 status, mask, pending; |
1388 | unsigned int pass_count = 0; | |
1389 | ||
7d2be074 HS |
1390 | do { |
1391 | status = mci_readl(host, SR); | |
1392 | mask = mci_readl(host, IMR); | |
1393 | pending = status & mask; | |
1394 | if (!pending) | |
1395 | break; | |
1396 | ||
1397 | if (pending & ATMCI_DATA_ERROR_FLAGS) { | |
1398 | mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS | |
1399 | | MCI_RXRDY | MCI_TXRDY); | |
1400 | pending &= mci_readl(host, IMR); | |
965ebf33 | 1401 | |
7d2be074 | 1402 | host->data_status = status; |
965ebf33 | 1403 | smp_wmb(); |
7d2be074 HS |
1404 | atmci_set_pending(host, EVENT_DATA_ERROR); |
1405 | tasklet_schedule(&host->tasklet); | |
1406 | } | |
1407 | if (pending & MCI_NOTBUSY) { | |
c06ad258 HS |
1408 | mci_writel(host, IDR, |
1409 | ATMCI_DATA_ERROR_FLAGS | MCI_NOTBUSY); | |
ca55f46e HS |
1410 | if (!host->data_status) |
1411 | host->data_status = status; | |
965ebf33 | 1412 | smp_wmb(); |
7d2be074 HS |
1413 | atmci_set_pending(host, EVENT_DATA_COMPLETE); |
1414 | tasklet_schedule(&host->tasklet); | |
1415 | } | |
1416 | if (pending & MCI_RXRDY) | |
1417 | atmci_read_data_pio(host); | |
1418 | if (pending & MCI_TXRDY) | |
1419 | atmci_write_data_pio(host); | |
1420 | ||
1421 | if (pending & MCI_CMDRDY) | |
965ebf33 | 1422 | atmci_cmd_interrupt(host, status); |
7d2be074 HS |
1423 | } while (pass_count++ < 5); |
1424 | ||
7d2be074 HS |
1425 | return pass_count ? IRQ_HANDLED : IRQ_NONE; |
1426 | } | |
1427 | ||
1428 | static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id) | |
1429 | { | |
965ebf33 | 1430 | struct atmel_mci_slot *slot = dev_id; |
7d2be074 HS |
1431 | |
1432 | /* | |
1433 | * Disable interrupts until the pin has stabilized and check | |
1434 | * the state then. Use mod_timer() since we may be in the | |
1435 | * middle of the timer routine when this interrupt triggers. | |
1436 | */ | |
1437 | disable_irq_nosync(irq); | |
965ebf33 | 1438 | mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20)); |
7d2be074 HS |
1439 | |
1440 | return IRQ_HANDLED; | |
1441 | } | |
1442 | ||
965ebf33 HS |
1443 | static int __init atmci_init_slot(struct atmel_mci *host, |
1444 | struct mci_slot_pdata *slot_data, unsigned int id, | |
1445 | u32 sdc_reg) | |
1446 | { | |
1447 | struct mmc_host *mmc; | |
1448 | struct atmel_mci_slot *slot; | |
1449 | ||
1450 | mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev); | |
1451 | if (!mmc) | |
1452 | return -ENOMEM; | |
1453 | ||
1454 | slot = mmc_priv(mmc); | |
1455 | slot->mmc = mmc; | |
1456 | slot->host = host; | |
1457 | slot->detect_pin = slot_data->detect_pin; | |
1458 | slot->wp_pin = slot_data->wp_pin; | |
1459 | slot->sdc_reg = sdc_reg; | |
1460 | ||
1461 | mmc->ops = &atmci_ops; | |
1462 | mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512); | |
1463 | mmc->f_max = host->bus_hz / 2; | |
1464 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; | |
1465 | if (slot_data->bus_width >= 4) | |
1466 | mmc->caps |= MMC_CAP_4_BIT_DATA; | |
1467 | ||
1468 | mmc->max_hw_segs = 64; | |
1469 | mmc->max_phys_segs = 64; | |
1470 | mmc->max_req_size = 32768 * 512; | |
1471 | mmc->max_blk_size = 32768; | |
1472 | mmc->max_blk_count = 512; | |
1473 | ||
1474 | /* Assume card is present initially */ | |
1475 | set_bit(ATMCI_CARD_PRESENT, &slot->flags); | |
1476 | if (gpio_is_valid(slot->detect_pin)) { | |
1477 | if (gpio_request(slot->detect_pin, "mmc_detect")) { | |
1478 | dev_dbg(&mmc->class_dev, "no detect pin available\n"); | |
1479 | slot->detect_pin = -EBUSY; | |
1480 | } else if (gpio_get_value(slot->detect_pin)) { | |
1481 | clear_bit(ATMCI_CARD_PRESENT, &slot->flags); | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | if (!gpio_is_valid(slot->detect_pin)) | |
1486 | mmc->caps |= MMC_CAP_NEEDS_POLL; | |
1487 | ||
1488 | if (gpio_is_valid(slot->wp_pin)) { | |
1489 | if (gpio_request(slot->wp_pin, "mmc_wp")) { | |
1490 | dev_dbg(&mmc->class_dev, "no WP pin available\n"); | |
1491 | slot->wp_pin = -EBUSY; | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | host->slot[id] = slot; | |
1496 | mmc_add_host(mmc); | |
1497 | ||
1498 | if (gpio_is_valid(slot->detect_pin)) { | |
1499 | int ret; | |
1500 | ||
1501 | setup_timer(&slot->detect_timer, atmci_detect_change, | |
1502 | (unsigned long)slot); | |
1503 | ||
1504 | ret = request_irq(gpio_to_irq(slot->detect_pin), | |
1505 | atmci_detect_interrupt, | |
1506 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, | |
1507 | "mmc-detect", slot); | |
1508 | if (ret) { | |
1509 | dev_dbg(&mmc->class_dev, | |
1510 | "could not request IRQ %d for detect pin\n", | |
1511 | gpio_to_irq(slot->detect_pin)); | |
1512 | gpio_free(slot->detect_pin); | |
1513 | slot->detect_pin = -EBUSY; | |
1514 | } | |
1515 | } | |
1516 | ||
1517 | atmci_init_debugfs(slot); | |
1518 | ||
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot, | |
1523 | unsigned int id) | |
1524 | { | |
1525 | /* Debugfs stuff is cleaned up by mmc core */ | |
1526 | ||
1527 | set_bit(ATMCI_SHUTDOWN, &slot->flags); | |
1528 | smp_wmb(); | |
1529 | ||
1530 | mmc_remove_host(slot->mmc); | |
1531 | ||
1532 | if (gpio_is_valid(slot->detect_pin)) { | |
1533 | int pin = slot->detect_pin; | |
1534 | ||
1535 | free_irq(gpio_to_irq(pin), slot); | |
1536 | del_timer_sync(&slot->detect_timer); | |
1537 | gpio_free(pin); | |
1538 | } | |
1539 | if (gpio_is_valid(slot->wp_pin)) | |
1540 | gpio_free(slot->wp_pin); | |
1541 | ||
1542 | slot->host->slot[id] = NULL; | |
1543 | mmc_free_host(slot->mmc); | |
1544 | } | |
1545 | ||
74465b4f | 1546 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
7dd60251 | 1547 | static bool filter(struct dma_chan *chan, void *slave) |
74465b4f DW |
1548 | { |
1549 | struct dw_dma_slave *dws = slave; | |
1550 | ||
287d8592 DW |
1551 | if (dws->dma_dev == chan->device->dev) { |
1552 | chan->private = dws; | |
7dd60251 | 1553 | return true; |
287d8592 | 1554 | } else |
7dd60251 | 1555 | return false; |
74465b4f DW |
1556 | } |
1557 | #endif | |
1558 | ||
7d2be074 HS |
1559 | static int __init atmci_probe(struct platform_device *pdev) |
1560 | { | |
1561 | struct mci_platform_data *pdata; | |
965ebf33 HS |
1562 | struct atmel_mci *host; |
1563 | struct resource *regs; | |
1564 | unsigned int nr_slots; | |
1565 | int irq; | |
1566 | int ret; | |
7d2be074 HS |
1567 | |
1568 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1569 | if (!regs) | |
1570 | return -ENXIO; | |
1571 | pdata = pdev->dev.platform_data; | |
1572 | if (!pdata) | |
1573 | return -ENXIO; | |
1574 | irq = platform_get_irq(pdev, 0); | |
1575 | if (irq < 0) | |
1576 | return irq; | |
1577 | ||
965ebf33 HS |
1578 | host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL); |
1579 | if (!host) | |
7d2be074 HS |
1580 | return -ENOMEM; |
1581 | ||
7d2be074 | 1582 | host->pdev = pdev; |
965ebf33 HS |
1583 | spin_lock_init(&host->lock); |
1584 | INIT_LIST_HEAD(&host->queue); | |
7d2be074 HS |
1585 | |
1586 | host->mck = clk_get(&pdev->dev, "mci_clk"); | |
1587 | if (IS_ERR(host->mck)) { | |
1588 | ret = PTR_ERR(host->mck); | |
1589 | goto err_clk_get; | |
1590 | } | |
1591 | ||
1592 | ret = -ENOMEM; | |
1593 | host->regs = ioremap(regs->start, regs->end - regs->start + 1); | |
1594 | if (!host->regs) | |
1595 | goto err_ioremap; | |
1596 | ||
1597 | clk_enable(host->mck); | |
1598 | mci_writel(host, CR, MCI_CR_SWRST); | |
1599 | host->bus_hz = clk_get_rate(host->mck); | |
1600 | clk_disable(host->mck); | |
1601 | ||
1602 | host->mapbase = regs->start; | |
1603 | ||
965ebf33 | 1604 | tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host); |
7d2be074 | 1605 | |
48f8151e | 1606 | ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host); |
7d2be074 HS |
1607 | if (ret) |
1608 | goto err_request_irq; | |
1609 | ||
65e8b083 | 1610 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
74465b4f DW |
1611 | if (pdata->dma_slave.dma_dev) { |
1612 | struct dw_dma_slave *dws = &pdata->dma_slave; | |
1613 | dma_cap_mask_t mask; | |
65e8b083 | 1614 | |
74465b4f DW |
1615 | dws->tx_reg = regs->start + MCI_TDR; |
1616 | dws->rx_reg = regs->start + MCI_RDR; | |
65e8b083 HS |
1617 | |
1618 | /* Try to grab a DMA channel */ | |
74465b4f DW |
1619 | dma_cap_zero(mask); |
1620 | dma_cap_set(DMA_SLAVE, mask); | |
1621 | host->dma.chan = dma_request_channel(mask, filter, dws); | |
65e8b083 | 1622 | } |
74465b4f DW |
1623 | if (!host->dma.chan) |
1624 | dev_notice(&pdev->dev, "DMA not available, using PIO\n"); | |
65e8b083 HS |
1625 | #endif /* CONFIG_MMC_ATMELMCI_DMA */ |
1626 | ||
7d2be074 HS |
1627 | platform_set_drvdata(pdev, host); |
1628 | ||
965ebf33 HS |
1629 | /* We need at least one slot to succeed */ |
1630 | nr_slots = 0; | |
1631 | ret = -ENODEV; | |
1632 | if (pdata->slot[0].bus_width) { | |
1633 | ret = atmci_init_slot(host, &pdata->slot[0], | |
1634 | MCI_SDCSEL_SLOT_A, 0); | |
1635 | if (!ret) | |
1636 | nr_slots++; | |
1637 | } | |
1638 | if (pdata->slot[1].bus_width) { | |
1639 | ret = atmci_init_slot(host, &pdata->slot[1], | |
1640 | MCI_SDCSEL_SLOT_B, 1); | |
1641 | if (!ret) | |
1642 | nr_slots++; | |
7d2be074 HS |
1643 | } |
1644 | ||
965ebf33 HS |
1645 | if (!nr_slots) |
1646 | goto err_init_slot; | |
7d2be074 | 1647 | |
965ebf33 HS |
1648 | dev_info(&pdev->dev, |
1649 | "Atmel MCI controller at 0x%08lx irq %d, %u slots\n", | |
1650 | host->mapbase, irq, nr_slots); | |
deec9ae3 | 1651 | |
7d2be074 HS |
1652 | return 0; |
1653 | ||
965ebf33 | 1654 | err_init_slot: |
65e8b083 | 1655 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
74465b4f DW |
1656 | if (host->dma.chan) |
1657 | dma_release_channel(host->dma.chan); | |
65e8b083 | 1658 | #endif |
965ebf33 | 1659 | free_irq(irq, host); |
7d2be074 HS |
1660 | err_request_irq: |
1661 | iounmap(host->regs); | |
1662 | err_ioremap: | |
1663 | clk_put(host->mck); | |
1664 | err_clk_get: | |
965ebf33 | 1665 | kfree(host); |
7d2be074 HS |
1666 | return ret; |
1667 | } | |
1668 | ||
1669 | static int __exit atmci_remove(struct platform_device *pdev) | |
1670 | { | |
965ebf33 HS |
1671 | struct atmel_mci *host = platform_get_drvdata(pdev); |
1672 | unsigned int i; | |
7d2be074 HS |
1673 | |
1674 | platform_set_drvdata(pdev, NULL); | |
1675 | ||
965ebf33 HS |
1676 | for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { |
1677 | if (host->slot[i]) | |
1678 | atmci_cleanup_slot(host->slot[i], i); | |
1679 | } | |
7d2be074 | 1680 | |
965ebf33 HS |
1681 | clk_enable(host->mck); |
1682 | mci_writel(host, IDR, ~0UL); | |
1683 | mci_writel(host, CR, MCI_CR_MCIDIS); | |
1684 | mci_readl(host, SR); | |
1685 | clk_disable(host->mck); | |
7d2be074 | 1686 | |
65e8b083 | 1687 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
74465b4f DW |
1688 | if (host->dma.chan) |
1689 | dma_release_channel(host->dma.chan); | |
65e8b083 HS |
1690 | #endif |
1691 | ||
965ebf33 HS |
1692 | free_irq(platform_get_irq(pdev, 0), host); |
1693 | iounmap(host->regs); | |
7d2be074 | 1694 | |
965ebf33 HS |
1695 | clk_put(host->mck); |
1696 | kfree(host); | |
7d2be074 | 1697 | |
7d2be074 HS |
1698 | return 0; |
1699 | } | |
1700 | ||
1701 | static struct platform_driver atmci_driver = { | |
1702 | .remove = __exit_p(atmci_remove), | |
1703 | .driver = { | |
1704 | .name = "atmel_mci", | |
1705 | }, | |
1706 | }; | |
1707 | ||
1708 | static int __init atmci_init(void) | |
1709 | { | |
1710 | return platform_driver_probe(&atmci_driver, atmci_probe); | |
1711 | } | |
1712 | ||
1713 | static void __exit atmci_exit(void) | |
1714 | { | |
1715 | platform_driver_unregister(&atmci_driver); | |
1716 | } | |
1717 | ||
74465b4f | 1718 | late_initcall(atmci_init); /* try to load after dma driver when built-in */ |
7d2be074 HS |
1719 | module_exit(atmci_exit); |
1720 | ||
1721 | MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver"); | |
1722 | MODULE_AUTHOR("Haavard Skinnemoen <haavard.skinnemoen@atmel.com>"); | |
1723 | MODULE_LICENSE("GPL v2"); |