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Merge tag 'powerpc-4.6-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[deliverable/linux.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/io.h>
21 #include <linux/ioport.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/of_device.h>
25 #include <linux/of_gpio.h>
26 #include <linux/platform_device.h>
27 #include <linux/scatterlist.h>
28 #include <linux/seq_file.h>
29 #include <linux/slab.h>
30 #include <linux/stat.h>
31 #include <linux/types.h>
32
33 #include <linux/mmc/host.h>
34 #include <linux/mmc/sdio.h>
35
36 #include <linux/atmel-mci.h>
37 #include <linux/atmel_pdc.h>
38 #include <linux/pm.h>
39 #include <linux/pm_runtime.h>
40 #include <linux/pinctrl/consumer.h>
41
42 #include <asm/cacheflush.h>
43 #include <asm/io.h>
44 #include <asm/unaligned.h>
45
46 /*
47 * Superset of MCI IP registers integrated in Atmel AVR32 and AT91 Processors
48 * Registers and bitfields marked with [2] are only available in MCI2
49 */
50
51 /* MCI Register Definitions */
52 #define ATMCI_CR 0x0000 /* Control */
53 #define ATMCI_CR_MCIEN BIT(0) /* MCI Enable */
54 #define ATMCI_CR_MCIDIS BIT(1) /* MCI Disable */
55 #define ATMCI_CR_PWSEN BIT(2) /* Power Save Enable */
56 #define ATMCI_CR_PWSDIS BIT(3) /* Power Save Disable */
57 #define ATMCI_CR_SWRST BIT(7) /* Software Reset */
58 #define ATMCI_MR 0x0004 /* Mode */
59 #define ATMCI_MR_CLKDIV(x) ((x) << 0) /* Clock Divider */
60 #define ATMCI_MR_PWSDIV(x) ((x) << 8) /* Power Saving Divider */
61 #define ATMCI_MR_RDPROOF BIT(11) /* Read Proof */
62 #define ATMCI_MR_WRPROOF BIT(12) /* Write Proof */
63 #define ATMCI_MR_PDCFBYTE BIT(13) /* Force Byte Transfer */
64 #define ATMCI_MR_PDCPADV BIT(14) /* Padding Value */
65 #define ATMCI_MR_PDCMODE BIT(15) /* PDC-oriented Mode */
66 #define ATMCI_MR_CLKODD(x) ((x) << 16) /* LSB of Clock Divider */
67 #define ATMCI_DTOR 0x0008 /* Data Timeout */
68 #define ATMCI_DTOCYC(x) ((x) << 0) /* Data Timeout Cycles */
69 #define ATMCI_DTOMUL(x) ((x) << 4) /* Data Timeout Multiplier */
70 #define ATMCI_SDCR 0x000c /* SD Card / SDIO */
71 #define ATMCI_SDCSEL_SLOT_A (0 << 0) /* Select SD slot A */
72 #define ATMCI_SDCSEL_SLOT_B (1 << 0) /* Select SD slot A */
73 #define ATMCI_SDCSEL_MASK (3 << 0)
74 #define ATMCI_SDCBUS_1BIT (0 << 6) /* 1-bit data bus */
75 #define ATMCI_SDCBUS_4BIT (2 << 6) /* 4-bit data bus */
76 #define ATMCI_SDCBUS_8BIT (3 << 6) /* 8-bit data bus[2] */
77 #define ATMCI_SDCBUS_MASK (3 << 6)
78 #define ATMCI_ARGR 0x0010 /* Command Argument */
79 #define ATMCI_CMDR 0x0014 /* Command */
80 #define ATMCI_CMDR_CMDNB(x) ((x) << 0) /* Command Opcode */
81 #define ATMCI_CMDR_RSPTYP_NONE (0 << 6) /* No response */
82 #define ATMCI_CMDR_RSPTYP_48BIT (1 << 6) /* 48-bit response */
83 #define ATMCI_CMDR_RSPTYP_136BIT (2 << 6) /* 136-bit response */
84 #define ATMCI_CMDR_SPCMD_INIT (1 << 8) /* Initialization command */
85 #define ATMCI_CMDR_SPCMD_SYNC (2 << 8) /* Synchronized command */
86 #define ATMCI_CMDR_SPCMD_INT (4 << 8) /* Interrupt command */
87 #define ATMCI_CMDR_SPCMD_INTRESP (5 << 8) /* Interrupt response */
88 #define ATMCI_CMDR_OPDCMD (1 << 11) /* Open Drain */
89 #define ATMCI_CMDR_MAXLAT_5CYC (0 << 12) /* Max latency 5 cycles */
90 #define ATMCI_CMDR_MAXLAT_64CYC (1 << 12) /* Max latency 64 cycles */
91 #define ATMCI_CMDR_START_XFER (1 << 16) /* Start data transfer */
92 #define ATMCI_CMDR_STOP_XFER (2 << 16) /* Stop data transfer */
93 #define ATMCI_CMDR_TRDIR_WRITE (0 << 18) /* Write data */
94 #define ATMCI_CMDR_TRDIR_READ (1 << 18) /* Read data */
95 #define ATMCI_CMDR_BLOCK (0 << 19) /* Single-block transfer */
96 #define ATMCI_CMDR_MULTI_BLOCK (1 << 19) /* Multi-block transfer */
97 #define ATMCI_CMDR_STREAM (2 << 19) /* MMC Stream transfer */
98 #define ATMCI_CMDR_SDIO_BYTE (4 << 19) /* SDIO Byte transfer */
99 #define ATMCI_CMDR_SDIO_BLOCK (5 << 19) /* SDIO Block transfer */
100 #define ATMCI_CMDR_SDIO_SUSPEND (1 << 24) /* SDIO Suspend Command */
101 #define ATMCI_CMDR_SDIO_RESUME (2 << 24) /* SDIO Resume Command */
102 #define ATMCI_BLKR 0x0018 /* Block */
103 #define ATMCI_BCNT(x) ((x) << 0) /* Data Block Count */
104 #define ATMCI_BLKLEN(x) ((x) << 16) /* Data Block Length */
105 #define ATMCI_CSTOR 0x001c /* Completion Signal Timeout[2] */
106 #define ATMCI_CSTOCYC(x) ((x) << 0) /* CST cycles */
107 #define ATMCI_CSTOMUL(x) ((x) << 4) /* CST multiplier */
108 #define ATMCI_RSPR 0x0020 /* Response 0 */
109 #define ATMCI_RSPR1 0x0024 /* Response 1 */
110 #define ATMCI_RSPR2 0x0028 /* Response 2 */
111 #define ATMCI_RSPR3 0x002c /* Response 3 */
112 #define ATMCI_RDR 0x0030 /* Receive Data */
113 #define ATMCI_TDR 0x0034 /* Transmit Data */
114 #define ATMCI_SR 0x0040 /* Status */
115 #define ATMCI_IER 0x0044 /* Interrupt Enable */
116 #define ATMCI_IDR 0x0048 /* Interrupt Disable */
117 #define ATMCI_IMR 0x004c /* Interrupt Mask */
118 #define ATMCI_CMDRDY BIT(0) /* Command Ready */
119 #define ATMCI_RXRDY BIT(1) /* Receiver Ready */
120 #define ATMCI_TXRDY BIT(2) /* Transmitter Ready */
121 #define ATMCI_BLKE BIT(3) /* Data Block Ended */
122 #define ATMCI_DTIP BIT(4) /* Data Transfer In Progress */
123 #define ATMCI_NOTBUSY BIT(5) /* Data Not Busy */
124 #define ATMCI_ENDRX BIT(6) /* End of RX Buffer */
125 #define ATMCI_ENDTX BIT(7) /* End of TX Buffer */
126 #define ATMCI_SDIOIRQA BIT(8) /* SDIO IRQ in slot A */
127 #define ATMCI_SDIOIRQB BIT(9) /* SDIO IRQ in slot B */
128 #define ATMCI_SDIOWAIT BIT(12) /* SDIO Read Wait Operation Status */
129 #define ATMCI_CSRCV BIT(13) /* CE-ATA Completion Signal Received */
130 #define ATMCI_RXBUFF BIT(14) /* RX Buffer Full */
131 #define ATMCI_TXBUFE BIT(15) /* TX Buffer Empty */
132 #define ATMCI_RINDE BIT(16) /* Response Index Error */
133 #define ATMCI_RDIRE BIT(17) /* Response Direction Error */
134 #define ATMCI_RCRCE BIT(18) /* Response CRC Error */
135 #define ATMCI_RENDE BIT(19) /* Response End Bit Error */
136 #define ATMCI_RTOE BIT(20) /* Response Time-Out Error */
137 #define ATMCI_DCRCE BIT(21) /* Data CRC Error */
138 #define ATMCI_DTOE BIT(22) /* Data Time-Out Error */
139 #define ATMCI_CSTOE BIT(23) /* Completion Signal Time-out Error */
140 #define ATMCI_BLKOVRE BIT(24) /* DMA Block Overrun Error */
141 #define ATMCI_DMADONE BIT(25) /* DMA Transfer Done */
142 #define ATMCI_FIFOEMPTY BIT(26) /* FIFO Empty Flag */
143 #define ATMCI_XFRDONE BIT(27) /* Transfer Done Flag */
144 #define ATMCI_ACKRCV BIT(28) /* Boot Operation Acknowledge Received */
145 #define ATMCI_ACKRCVE BIT(29) /* Boot Operation Acknowledge Error */
146 #define ATMCI_OVRE BIT(30) /* RX Overrun Error */
147 #define ATMCI_UNRE BIT(31) /* TX Underrun Error */
148 #define ATMCI_DMA 0x0050 /* DMA Configuration[2] */
149 #define ATMCI_DMA_OFFSET(x) ((x) << 0) /* DMA Write Buffer Offset */
150 #define ATMCI_DMA_CHKSIZE(x) ((x) << 4) /* DMA Channel Read and Write Chunk Size */
151 #define ATMCI_DMAEN BIT(8) /* DMA Hardware Handshaking Enable */
152 #define ATMCI_CFG 0x0054 /* Configuration[2] */
153 #define ATMCI_CFG_FIFOMODE_1DATA BIT(0) /* MCI Internal FIFO control mode */
154 #define ATMCI_CFG_FERRCTRL_COR BIT(4) /* Flow Error flag reset control mode */
155 #define ATMCI_CFG_HSMODE BIT(8) /* High Speed Mode */
156 #define ATMCI_CFG_LSYNC BIT(12) /* Synchronize on the last block */
157 #define ATMCI_WPMR 0x00e4 /* Write Protection Mode[2] */
158 #define ATMCI_WP_EN BIT(0) /* WP Enable */
159 #define ATMCI_WP_KEY (0x4d4349 << 8) /* WP Key */
160 #define ATMCI_WPSR 0x00e8 /* Write Protection Status[2] */
161 #define ATMCI_GET_WP_VS(x) ((x) & 0x0f)
162 #define ATMCI_GET_WP_VSRC(x) (((x) >> 8) & 0xffff)
163 #define ATMCI_VERSION 0x00FC /* Version */
164 #define ATMCI_FIFO_APERTURE 0x0200 /* FIFO Aperture[2] */
165
166 /* This is not including the FIFO Aperture on MCI2 */
167 #define ATMCI_REGS_SIZE 0x100
168
169 /* Register access macros */
170 #define atmci_readl(port, reg) \
171 __raw_readl((port)->regs + reg)
172 #define atmci_writel(port, reg, value) \
173 __raw_writel((value), (port)->regs + reg)
174
175 /* On AVR chips the Peripheral DMA Controller is not connected to MCI. */
176 #ifdef CONFIG_AVR32
177 # define ATMCI_PDC_CONNECTED 0
178 #else
179 # define ATMCI_PDC_CONNECTED 1
180 #endif
181
182 #define AUTOSUSPEND_DELAY 50
183
184 #define ATMCI_DATA_ERROR_FLAGS (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
185 #define ATMCI_DMA_THRESHOLD 16
186
187 enum {
188 EVENT_CMD_RDY = 0,
189 EVENT_XFER_COMPLETE,
190 EVENT_NOTBUSY,
191 EVENT_DATA_ERROR,
192 };
193
194 enum atmel_mci_state {
195 STATE_IDLE = 0,
196 STATE_SENDING_CMD,
197 STATE_DATA_XFER,
198 STATE_WAITING_NOTBUSY,
199 STATE_SENDING_STOP,
200 STATE_END_REQUEST,
201 };
202
203 enum atmci_xfer_dir {
204 XFER_RECEIVE = 0,
205 XFER_TRANSMIT,
206 };
207
208 enum atmci_pdc_buf {
209 PDC_FIRST_BUF = 0,
210 PDC_SECOND_BUF,
211 };
212
213 struct atmel_mci_caps {
214 bool has_dma_conf_reg;
215 bool has_pdc;
216 bool has_cfg_reg;
217 bool has_cstor_reg;
218 bool has_highspeed;
219 bool has_rwproof;
220 bool has_odd_clk_div;
221 bool has_bad_data_ordering;
222 bool need_reset_after_xfer;
223 bool need_blksz_mul_4;
224 bool need_notbusy_for_read_ops;
225 };
226
227 struct atmel_mci_dma {
228 struct dma_chan *chan;
229 struct dma_async_tx_descriptor *data_desc;
230 };
231
232 /**
233 * struct atmel_mci - MMC controller state shared between all slots
234 * @lock: Spinlock protecting the queue and associated data.
235 * @regs: Pointer to MMIO registers.
236 * @sg: Scatterlist entry currently being processed by PIO or PDC code.
237 * @pio_offset: Offset into the current scatterlist entry.
238 * @buffer: Buffer used if we don't have the r/w proof capability. We
239 * don't have the time to switch pdc buffers so we have to use only
240 * one buffer for the full transaction.
241 * @buf_size: size of the buffer.
242 * @phys_buf_addr: buffer address needed for pdc.
243 * @cur_slot: The slot which is currently using the controller.
244 * @mrq: The request currently being processed on @cur_slot,
245 * or NULL if the controller is idle.
246 * @cmd: The command currently being sent to the card, or NULL.
247 * @data: The data currently being transferred, or NULL if no data
248 * transfer is in progress.
249 * @data_size: just data->blocks * data->blksz.
250 * @dma: DMA client state.
251 * @data_chan: DMA channel being used for the current data transfer.
252 * @cmd_status: Snapshot of SR taken upon completion of the current
253 * command. Only valid when EVENT_CMD_COMPLETE is pending.
254 * @data_status: Snapshot of SR taken upon completion of the current
255 * data transfer. Only valid when EVENT_DATA_COMPLETE or
256 * EVENT_DATA_ERROR is pending.
257 * @stop_cmdr: Value to be loaded into CMDR when the stop command is
258 * to be sent.
259 * @tasklet: Tasklet running the request state machine.
260 * @pending_events: Bitmask of events flagged by the interrupt handler
261 * to be processed by the tasklet.
262 * @completed_events: Bitmask of events which the state machine has
263 * processed.
264 * @state: Tasklet state.
265 * @queue: List of slots waiting for access to the controller.
266 * @need_clock_update: Update the clock rate before the next request.
267 * @need_reset: Reset controller before next request.
268 * @timer: Timer to balance the data timeout error flag which cannot rise.
269 * @mode_reg: Value of the MR register.
270 * @cfg_reg: Value of the CFG register.
271 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
272 * rate and timeout calculations.
273 * @mapbase: Physical address of the MMIO registers.
274 * @mck: The peripheral bus clock hooked up to the MMC controller.
275 * @pdev: Platform device associated with the MMC controller.
276 * @slot: Slots sharing this MMC controller.
277 * @caps: MCI capabilities depending on MCI version.
278 * @prepare_data: function to setup MCI before data transfer which
279 * depends on MCI capabilities.
280 * @submit_data: function to start data transfer which depends on MCI
281 * capabilities.
282 * @stop_transfer: function to stop data transfer which depends on MCI
283 * capabilities.
284 *
285 * Locking
286 * =======
287 *
288 * @lock is a softirq-safe spinlock protecting @queue as well as
289 * @cur_slot, @mrq and @state. These must always be updated
290 * at the same time while holding @lock.
291 *
292 * @lock also protects mode_reg and need_clock_update since these are
293 * used to synchronize mode register updates with the queue
294 * processing.
295 *
296 * The @mrq field of struct atmel_mci_slot is also protected by @lock,
297 * and must always be written at the same time as the slot is added to
298 * @queue.
299 *
300 * @pending_events and @completed_events are accessed using atomic bit
301 * operations, so they don't need any locking.
302 *
303 * None of the fields touched by the interrupt handler need any
304 * locking. However, ordering is important: Before EVENT_DATA_ERROR or
305 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
306 * interrupts must be disabled and @data_status updated with a
307 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
308 * CMDRDY interrupt must be disabled and @cmd_status updated with a
309 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
310 * bytes_xfered field of @data must be written. This is ensured by
311 * using barriers.
312 */
313 struct atmel_mci {
314 spinlock_t lock;
315 void __iomem *regs;
316
317 struct scatterlist *sg;
318 unsigned int sg_len;
319 unsigned int pio_offset;
320 unsigned int *buffer;
321 unsigned int buf_size;
322 dma_addr_t buf_phys_addr;
323
324 struct atmel_mci_slot *cur_slot;
325 struct mmc_request *mrq;
326 struct mmc_command *cmd;
327 struct mmc_data *data;
328 unsigned int data_size;
329
330 struct atmel_mci_dma dma;
331 struct dma_chan *data_chan;
332 struct dma_slave_config dma_conf;
333
334 u32 cmd_status;
335 u32 data_status;
336 u32 stop_cmdr;
337
338 struct tasklet_struct tasklet;
339 unsigned long pending_events;
340 unsigned long completed_events;
341 enum atmel_mci_state state;
342 struct list_head queue;
343
344 bool need_clock_update;
345 bool need_reset;
346 struct timer_list timer;
347 u32 mode_reg;
348 u32 cfg_reg;
349 unsigned long bus_hz;
350 unsigned long mapbase;
351 struct clk *mck;
352 struct platform_device *pdev;
353
354 struct atmel_mci_slot *slot[ATMCI_MAX_NR_SLOTS];
355
356 struct atmel_mci_caps caps;
357
358 u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
359 void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
360 void (*stop_transfer)(struct atmel_mci *host);
361 };
362
363 /**
364 * struct atmel_mci_slot - MMC slot state
365 * @mmc: The mmc_host representing this slot.
366 * @host: The MMC controller this slot is using.
367 * @sdc_reg: Value of SDCR to be written before using this slot.
368 * @sdio_irq: SDIO irq mask for this slot.
369 * @mrq: mmc_request currently being processed or waiting to be
370 * processed, or NULL when the slot is idle.
371 * @queue_node: List node for placing this node in the @queue list of
372 * &struct atmel_mci.
373 * @clock: Clock rate configured by set_ios(). Protected by host->lock.
374 * @flags: Random state bits associated with the slot.
375 * @detect_pin: GPIO pin used for card detection, or negative if not
376 * available.
377 * @wp_pin: GPIO pin used for card write protect sending, or negative
378 * if not available.
379 * @detect_is_active_high: The state of the detect pin when it is active.
380 * @detect_timer: Timer used for debouncing @detect_pin interrupts.
381 */
382 struct atmel_mci_slot {
383 struct mmc_host *mmc;
384 struct atmel_mci *host;
385
386 u32 sdc_reg;
387 u32 sdio_irq;
388
389 struct mmc_request *mrq;
390 struct list_head queue_node;
391
392 unsigned int clock;
393 unsigned long flags;
394 #define ATMCI_CARD_PRESENT 0
395 #define ATMCI_CARD_NEED_INIT 1
396 #define ATMCI_SHUTDOWN 2
397
398 int detect_pin;
399 int wp_pin;
400 bool detect_is_active_high;
401
402 struct timer_list detect_timer;
403 };
404
405 #define atmci_test_and_clear_pending(host, event) \
406 test_and_clear_bit(event, &host->pending_events)
407 #define atmci_set_completed(host, event) \
408 set_bit(event, &host->completed_events)
409 #define atmci_set_pending(host, event) \
410 set_bit(event, &host->pending_events)
411
412 /*
413 * The debugfs stuff below is mostly optimized away when
414 * CONFIG_DEBUG_FS is not set.
415 */
416 static int atmci_req_show(struct seq_file *s, void *v)
417 {
418 struct atmel_mci_slot *slot = s->private;
419 struct mmc_request *mrq;
420 struct mmc_command *cmd;
421 struct mmc_command *stop;
422 struct mmc_data *data;
423
424 /* Make sure we get a consistent snapshot */
425 spin_lock_bh(&slot->host->lock);
426 mrq = slot->mrq;
427
428 if (mrq) {
429 cmd = mrq->cmd;
430 data = mrq->data;
431 stop = mrq->stop;
432
433 if (cmd)
434 seq_printf(s,
435 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
436 cmd->opcode, cmd->arg, cmd->flags,
437 cmd->resp[0], cmd->resp[1], cmd->resp[2],
438 cmd->resp[3], cmd->error);
439 if (data)
440 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
441 data->bytes_xfered, data->blocks,
442 data->blksz, data->flags, data->error);
443 if (stop)
444 seq_printf(s,
445 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
446 stop->opcode, stop->arg, stop->flags,
447 stop->resp[0], stop->resp[1], stop->resp[2],
448 stop->resp[3], stop->error);
449 }
450
451 spin_unlock_bh(&slot->host->lock);
452
453 return 0;
454 }
455
456 static int atmci_req_open(struct inode *inode, struct file *file)
457 {
458 return single_open(file, atmci_req_show, inode->i_private);
459 }
460
461 static const struct file_operations atmci_req_fops = {
462 .owner = THIS_MODULE,
463 .open = atmci_req_open,
464 .read = seq_read,
465 .llseek = seq_lseek,
466 .release = single_release,
467 };
468
469 static void atmci_show_status_reg(struct seq_file *s,
470 const char *regname, u32 value)
471 {
472 static const char *sr_bit[] = {
473 [0] = "CMDRDY",
474 [1] = "RXRDY",
475 [2] = "TXRDY",
476 [3] = "BLKE",
477 [4] = "DTIP",
478 [5] = "NOTBUSY",
479 [6] = "ENDRX",
480 [7] = "ENDTX",
481 [8] = "SDIOIRQA",
482 [9] = "SDIOIRQB",
483 [12] = "SDIOWAIT",
484 [14] = "RXBUFF",
485 [15] = "TXBUFE",
486 [16] = "RINDE",
487 [17] = "RDIRE",
488 [18] = "RCRCE",
489 [19] = "RENDE",
490 [20] = "RTOE",
491 [21] = "DCRCE",
492 [22] = "DTOE",
493 [23] = "CSTOE",
494 [24] = "BLKOVRE",
495 [25] = "DMADONE",
496 [26] = "FIFOEMPTY",
497 [27] = "XFRDONE",
498 [30] = "OVRE",
499 [31] = "UNRE",
500 };
501 unsigned int i;
502
503 seq_printf(s, "%s:\t0x%08x", regname, value);
504 for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
505 if (value & (1 << i)) {
506 if (sr_bit[i])
507 seq_printf(s, " %s", sr_bit[i]);
508 else
509 seq_puts(s, " UNKNOWN");
510 }
511 }
512 seq_putc(s, '\n');
513 }
514
515 static int atmci_regs_show(struct seq_file *s, void *v)
516 {
517 struct atmel_mci *host = s->private;
518 u32 *buf;
519 int ret = 0;
520
521
522 buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
523 if (!buf)
524 return -ENOMEM;
525
526 pm_runtime_get_sync(&host->pdev->dev);
527
528 /*
529 * Grab a more or less consistent snapshot. Note that we're
530 * not disabling interrupts, so IMR and SR may not be
531 * consistent.
532 */
533 spin_lock_bh(&host->lock);
534 memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
535 spin_unlock_bh(&host->lock);
536
537 pm_runtime_mark_last_busy(&host->pdev->dev);
538 pm_runtime_put_autosuspend(&host->pdev->dev);
539
540 seq_printf(s, "MR:\t0x%08x%s%s ",
541 buf[ATMCI_MR / 4],
542 buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
543 buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
544 if (host->caps.has_odd_clk_div)
545 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
546 ((buf[ATMCI_MR / 4] & 0xff) << 1)
547 | ((buf[ATMCI_MR / 4] >> 16) & 1));
548 else
549 seq_printf(s, "CLKDIV=%u\n",
550 (buf[ATMCI_MR / 4] & 0xff));
551 seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
552 seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
553 seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
554 seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
555 buf[ATMCI_BLKR / 4],
556 buf[ATMCI_BLKR / 4] & 0xffff,
557 (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
558 if (host->caps.has_cstor_reg)
559 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
560
561 /* Don't read RSPR and RDR; it will consume the data there */
562
563 atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
564 atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
565
566 if (host->caps.has_dma_conf_reg) {
567 u32 val;
568
569 val = buf[ATMCI_DMA / 4];
570 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
571 val, val & 3,
572 ((val >> 4) & 3) ?
573 1 << (((val >> 4) & 3) + 1) : 1,
574 val & ATMCI_DMAEN ? " DMAEN" : "");
575 }
576 if (host->caps.has_cfg_reg) {
577 u32 val;
578
579 val = buf[ATMCI_CFG / 4];
580 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
581 val,
582 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
583 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
584 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
585 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
586 }
587
588 kfree(buf);
589
590 return ret;
591 }
592
593 static int atmci_regs_open(struct inode *inode, struct file *file)
594 {
595 return single_open(file, atmci_regs_show, inode->i_private);
596 }
597
598 static const struct file_operations atmci_regs_fops = {
599 .owner = THIS_MODULE,
600 .open = atmci_regs_open,
601 .read = seq_read,
602 .llseek = seq_lseek,
603 .release = single_release,
604 };
605
606 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
607 {
608 struct mmc_host *mmc = slot->mmc;
609 struct atmel_mci *host = slot->host;
610 struct dentry *root;
611 struct dentry *node;
612
613 root = mmc->debugfs_root;
614 if (!root)
615 return;
616
617 node = debugfs_create_file("regs", S_IRUSR, root, host,
618 &atmci_regs_fops);
619 if (IS_ERR(node))
620 return;
621 if (!node)
622 goto err;
623
624 node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
625 if (!node)
626 goto err;
627
628 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
629 if (!node)
630 goto err;
631
632 node = debugfs_create_x32("pending_events", S_IRUSR, root,
633 (u32 *)&host->pending_events);
634 if (!node)
635 goto err;
636
637 node = debugfs_create_x32("completed_events", S_IRUSR, root,
638 (u32 *)&host->completed_events);
639 if (!node)
640 goto err;
641
642 return;
643
644 err:
645 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
646 }
647
648 #if defined(CONFIG_OF)
649 static const struct of_device_id atmci_dt_ids[] = {
650 { .compatible = "atmel,hsmci" },
651 { /* sentinel */ }
652 };
653
654 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
655
656 static struct mci_platform_data*
657 atmci_of_init(struct platform_device *pdev)
658 {
659 struct device_node *np = pdev->dev.of_node;
660 struct device_node *cnp;
661 struct mci_platform_data *pdata;
662 u32 slot_id;
663
664 if (!np) {
665 dev_err(&pdev->dev, "device node not found\n");
666 return ERR_PTR(-EINVAL);
667 }
668
669 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
670 if (!pdata) {
671 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
672 return ERR_PTR(-ENOMEM);
673 }
674
675 for_each_child_of_node(np, cnp) {
676 if (of_property_read_u32(cnp, "reg", &slot_id)) {
677 dev_warn(&pdev->dev, "reg property is missing for %s\n",
678 cnp->full_name);
679 continue;
680 }
681
682 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
683 dev_warn(&pdev->dev, "can't have more than %d slots\n",
684 ATMCI_MAX_NR_SLOTS);
685 break;
686 }
687
688 if (of_property_read_u32(cnp, "bus-width",
689 &pdata->slot[slot_id].bus_width))
690 pdata->slot[slot_id].bus_width = 1;
691
692 pdata->slot[slot_id].detect_pin =
693 of_get_named_gpio(cnp, "cd-gpios", 0);
694
695 pdata->slot[slot_id].detect_is_active_high =
696 of_property_read_bool(cnp, "cd-inverted");
697
698 pdata->slot[slot_id].non_removable =
699 of_property_read_bool(cnp, "non-removable");
700
701 pdata->slot[slot_id].wp_pin =
702 of_get_named_gpio(cnp, "wp-gpios", 0);
703 }
704
705 return pdata;
706 }
707 #else /* CONFIG_OF */
708 static inline struct mci_platform_data*
709 atmci_of_init(struct platform_device *dev)
710 {
711 return ERR_PTR(-EINVAL);
712 }
713 #endif
714
715 static inline unsigned int atmci_get_version(struct atmel_mci *host)
716 {
717 return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
718 }
719
720 /*
721 * Fix sconfig's burst size according to atmel MCI. We need to convert them as:
722 * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
723 * With version 0x600, we need to convert them as: 1 -> 0, 2 -> 1, 4 -> 2,
724 * 8 -> 3, 16 -> 4.
725 *
726 * This can be done by finding most significant bit set.
727 */
728 static inline unsigned int atmci_convert_chksize(struct atmel_mci *host,
729 unsigned int maxburst)
730 {
731 unsigned int version = atmci_get_version(host);
732 unsigned int offset = 2;
733
734 if (version >= 0x600)
735 offset = 1;
736
737 if (maxburst > 1)
738 return fls(maxburst) - offset;
739 else
740 return 0;
741 }
742
743 static void atmci_timeout_timer(unsigned long data)
744 {
745 struct atmel_mci *host;
746
747 host = (struct atmel_mci *)data;
748
749 dev_dbg(&host->pdev->dev, "software timeout\n");
750
751 if (host->mrq->cmd->data) {
752 host->mrq->cmd->data->error = -ETIMEDOUT;
753 host->data = NULL;
754 /*
755 * With some SDIO modules, sometimes DMA transfer hangs. If
756 * stop_transfer() is not called then the DMA request is not
757 * removed, following ones are queued and never computed.
758 */
759 if (host->state == STATE_DATA_XFER)
760 host->stop_transfer(host);
761 } else {
762 host->mrq->cmd->error = -ETIMEDOUT;
763 host->cmd = NULL;
764 }
765 host->need_reset = 1;
766 host->state = STATE_END_REQUEST;
767 smp_wmb();
768 tasklet_schedule(&host->tasklet);
769 }
770
771 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
772 unsigned int ns)
773 {
774 /*
775 * It is easier here to use us instead of ns for the timeout,
776 * it prevents from overflows during calculation.
777 */
778 unsigned int us = DIV_ROUND_UP(ns, 1000);
779
780 /* Maximum clock frequency is host->bus_hz/2 */
781 return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
782 }
783
784 static void atmci_set_timeout(struct atmel_mci *host,
785 struct atmel_mci_slot *slot, struct mmc_data *data)
786 {
787 static unsigned dtomul_to_shift[] = {
788 0, 4, 7, 8, 10, 12, 16, 20
789 };
790 unsigned timeout;
791 unsigned dtocyc;
792 unsigned dtomul;
793
794 timeout = atmci_ns_to_clocks(host, data->timeout_ns)
795 + data->timeout_clks;
796
797 for (dtomul = 0; dtomul < 8; dtomul++) {
798 unsigned shift = dtomul_to_shift[dtomul];
799 dtocyc = (timeout + (1 << shift) - 1) >> shift;
800 if (dtocyc < 15)
801 break;
802 }
803
804 if (dtomul >= 8) {
805 dtomul = 7;
806 dtocyc = 15;
807 }
808
809 dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
810 dtocyc << dtomul_to_shift[dtomul]);
811 atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
812 }
813
814 /*
815 * Return mask with command flags to be enabled for this command.
816 */
817 static u32 atmci_prepare_command(struct mmc_host *mmc,
818 struct mmc_command *cmd)
819 {
820 struct mmc_data *data;
821 u32 cmdr;
822
823 cmd->error = -EINPROGRESS;
824
825 cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
826
827 if (cmd->flags & MMC_RSP_PRESENT) {
828 if (cmd->flags & MMC_RSP_136)
829 cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
830 else
831 cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
832 }
833
834 /*
835 * This should really be MAXLAT_5 for CMD2 and ACMD41, but
836 * it's too difficult to determine whether this is an ACMD or
837 * not. Better make it 64.
838 */
839 cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
840
841 if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
842 cmdr |= ATMCI_CMDR_OPDCMD;
843
844 data = cmd->data;
845 if (data) {
846 cmdr |= ATMCI_CMDR_START_XFER;
847
848 if (cmd->opcode == SD_IO_RW_EXTENDED) {
849 cmdr |= ATMCI_CMDR_SDIO_BLOCK;
850 } else {
851 if (data->blocks > 1)
852 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
853 else
854 cmdr |= ATMCI_CMDR_BLOCK;
855 }
856
857 if (data->flags & MMC_DATA_READ)
858 cmdr |= ATMCI_CMDR_TRDIR_READ;
859 }
860
861 return cmdr;
862 }
863
864 static void atmci_send_command(struct atmel_mci *host,
865 struct mmc_command *cmd, u32 cmd_flags)
866 {
867 WARN_ON(host->cmd);
868 host->cmd = cmd;
869
870 dev_vdbg(&host->pdev->dev,
871 "start command: ARGR=0x%08x CMDR=0x%08x\n",
872 cmd->arg, cmd_flags);
873
874 atmci_writel(host, ATMCI_ARGR, cmd->arg);
875 atmci_writel(host, ATMCI_CMDR, cmd_flags);
876 }
877
878 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
879 {
880 dev_dbg(&host->pdev->dev, "send stop command\n");
881 atmci_send_command(host, data->stop, host->stop_cmdr);
882 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
883 }
884
885 /*
886 * Configure given PDC buffer taking care of alignement issues.
887 * Update host->data_size and host->sg.
888 */
889 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
890 enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
891 {
892 u32 pointer_reg, counter_reg;
893 unsigned int buf_size;
894
895 if (dir == XFER_RECEIVE) {
896 pointer_reg = ATMEL_PDC_RPR;
897 counter_reg = ATMEL_PDC_RCR;
898 } else {
899 pointer_reg = ATMEL_PDC_TPR;
900 counter_reg = ATMEL_PDC_TCR;
901 }
902
903 if (buf_nb == PDC_SECOND_BUF) {
904 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
905 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
906 }
907
908 if (!host->caps.has_rwproof) {
909 buf_size = host->buf_size;
910 atmci_writel(host, pointer_reg, host->buf_phys_addr);
911 } else {
912 buf_size = sg_dma_len(host->sg);
913 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
914 }
915
916 if (host->data_size <= buf_size) {
917 if (host->data_size & 0x3) {
918 /* If size is different from modulo 4, transfer bytes */
919 atmci_writel(host, counter_reg, host->data_size);
920 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
921 } else {
922 /* Else transfer 32-bits words */
923 atmci_writel(host, counter_reg, host->data_size / 4);
924 }
925 host->data_size = 0;
926 } else {
927 /* We assume the size of a page is 32-bits aligned */
928 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
929 host->data_size -= sg_dma_len(host->sg);
930 if (host->data_size)
931 host->sg = sg_next(host->sg);
932 }
933 }
934
935 /*
936 * Configure PDC buffer according to the data size ie configuring one or two
937 * buffers. Don't use this function if you want to configure only the second
938 * buffer. In this case, use atmci_pdc_set_single_buf.
939 */
940 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
941 {
942 atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
943 if (host->data_size)
944 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
945 }
946
947 /*
948 * Unmap sg lists, called when transfer is finished.
949 */
950 static void atmci_pdc_cleanup(struct atmel_mci *host)
951 {
952 struct mmc_data *data = host->data;
953
954 if (data)
955 dma_unmap_sg(&host->pdev->dev,
956 data->sg, data->sg_len,
957 ((data->flags & MMC_DATA_WRITE)
958 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
959 }
960
961 /*
962 * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
963 * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
964 * interrupt needed for both transfer directions.
965 */
966 static void atmci_pdc_complete(struct atmel_mci *host)
967 {
968 int transfer_size = host->data->blocks * host->data->blksz;
969 int i;
970
971 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
972
973 if ((!host->caps.has_rwproof)
974 && (host->data->flags & MMC_DATA_READ)) {
975 if (host->caps.has_bad_data_ordering)
976 for (i = 0; i < transfer_size; i++)
977 host->buffer[i] = swab32(host->buffer[i]);
978 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
979 host->buffer, transfer_size);
980 }
981
982 atmci_pdc_cleanup(host);
983
984 dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
985 atmci_set_pending(host, EVENT_XFER_COMPLETE);
986 tasklet_schedule(&host->tasklet);
987 }
988
989 static void atmci_dma_cleanup(struct atmel_mci *host)
990 {
991 struct mmc_data *data = host->data;
992
993 if (data)
994 dma_unmap_sg(host->dma.chan->device->dev,
995 data->sg, data->sg_len,
996 ((data->flags & MMC_DATA_WRITE)
997 ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
998 }
999
1000 /*
1001 * This function is called by the DMA driver from tasklet context.
1002 */
1003 static void atmci_dma_complete(void *arg)
1004 {
1005 struct atmel_mci *host = arg;
1006 struct mmc_data *data = host->data;
1007
1008 dev_vdbg(&host->pdev->dev, "DMA complete\n");
1009
1010 if (host->caps.has_dma_conf_reg)
1011 /* Disable DMA hardware handshaking on MCI */
1012 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
1013
1014 atmci_dma_cleanup(host);
1015
1016 /*
1017 * If the card was removed, data will be NULL. No point trying
1018 * to send the stop command or waiting for NBUSY in this case.
1019 */
1020 if (data) {
1021 dev_dbg(&host->pdev->dev,
1022 "(%s) set pending xfer complete\n", __func__);
1023 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1024 tasklet_schedule(&host->tasklet);
1025
1026 /*
1027 * Regardless of what the documentation says, we have
1028 * to wait for NOTBUSY even after block read
1029 * operations.
1030 *
1031 * When the DMA transfer is complete, the controller
1032 * may still be reading the CRC from the card, i.e.
1033 * the data transfer is still in progress and we
1034 * haven't seen all the potential error bits yet.
1035 *
1036 * The interrupt handler will schedule a different
1037 * tasklet to finish things up when the data transfer
1038 * is completely done.
1039 *
1040 * We may not complete the mmc request here anyway
1041 * because the mmc layer may call back and cause us to
1042 * violate the "don't submit new operations from the
1043 * completion callback" rule of the dma engine
1044 * framework.
1045 */
1046 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1047 }
1048 }
1049
1050 /*
1051 * Returns a mask of interrupt flags to be enabled after the whole
1052 * request has been prepared.
1053 */
1054 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
1055 {
1056 u32 iflags;
1057
1058 data->error = -EINPROGRESS;
1059
1060 host->sg = data->sg;
1061 host->sg_len = data->sg_len;
1062 host->data = data;
1063 host->data_chan = NULL;
1064
1065 iflags = ATMCI_DATA_ERROR_FLAGS;
1066
1067 /*
1068 * Errata: MMC data write operation with less than 12
1069 * bytes is impossible.
1070 *
1071 * Errata: MCI Transmit Data Register (TDR) FIFO
1072 * corruption when length is not multiple of 4.
1073 */
1074 if (data->blocks * data->blksz < 12
1075 || (data->blocks * data->blksz) & 3)
1076 host->need_reset = true;
1077
1078 host->pio_offset = 0;
1079 if (data->flags & MMC_DATA_READ)
1080 iflags |= ATMCI_RXRDY;
1081 else
1082 iflags |= ATMCI_TXRDY;
1083
1084 return iflags;
1085 }
1086
1087 /*
1088 * Set interrupt flags and set block length into the MCI mode register even
1089 * if this value is also accessible in the MCI block register. It seems to be
1090 * necessary before the High Speed MCI version. It also map sg and configure
1091 * PDC registers.
1092 */
1093 static u32
1094 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1095 {
1096 u32 iflags, tmp;
1097 unsigned int sg_len;
1098 enum dma_data_direction dir;
1099 int i;
1100
1101 data->error = -EINPROGRESS;
1102
1103 host->data = data;
1104 host->sg = data->sg;
1105 iflags = ATMCI_DATA_ERROR_FLAGS;
1106
1107 /* Enable pdc mode */
1108 atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
1109
1110 if (data->flags & MMC_DATA_READ) {
1111 dir = DMA_FROM_DEVICE;
1112 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
1113 } else {
1114 dir = DMA_TO_DEVICE;
1115 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
1116 }
1117
1118 /* Set BLKLEN */
1119 tmp = atmci_readl(host, ATMCI_MR);
1120 tmp &= 0x0000ffff;
1121 tmp |= ATMCI_BLKLEN(data->blksz);
1122 atmci_writel(host, ATMCI_MR, tmp);
1123
1124 /* Configure PDC */
1125 host->data_size = data->blocks * data->blksz;
1126 sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
1127
1128 if ((!host->caps.has_rwproof)
1129 && (host->data->flags & MMC_DATA_WRITE)) {
1130 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
1131 host->buffer, host->data_size);
1132 if (host->caps.has_bad_data_ordering)
1133 for (i = 0; i < host->data_size; i++)
1134 host->buffer[i] = swab32(host->buffer[i]);
1135 }
1136
1137 if (host->data_size)
1138 atmci_pdc_set_both_buf(host,
1139 ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
1140
1141 return iflags;
1142 }
1143
1144 static u32
1145 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
1146 {
1147 struct dma_chan *chan;
1148 struct dma_async_tx_descriptor *desc;
1149 struct scatterlist *sg;
1150 unsigned int i;
1151 enum dma_data_direction direction;
1152 enum dma_transfer_direction slave_dirn;
1153 unsigned int sglen;
1154 u32 maxburst;
1155 u32 iflags;
1156
1157 data->error = -EINPROGRESS;
1158
1159 WARN_ON(host->data);
1160 host->sg = NULL;
1161 host->data = data;
1162
1163 iflags = ATMCI_DATA_ERROR_FLAGS;
1164
1165 /*
1166 * We don't do DMA on "complex" transfers, i.e. with
1167 * non-word-aligned buffers or lengths. Also, we don't bother
1168 * with all the DMA setup overhead for short transfers.
1169 */
1170 if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1171 return atmci_prepare_data(host, data);
1172 if (data->blksz & 3)
1173 return atmci_prepare_data(host, data);
1174
1175 for_each_sg(data->sg, sg, data->sg_len, i) {
1176 if (sg->offset & 3 || sg->length & 3)
1177 return atmci_prepare_data(host, data);
1178 }
1179
1180 /* If we don't have a channel, we can't do DMA */
1181 chan = host->dma.chan;
1182 if (chan)
1183 host->data_chan = chan;
1184
1185 if (!chan)
1186 return -ENODEV;
1187
1188 if (data->flags & MMC_DATA_READ) {
1189 direction = DMA_FROM_DEVICE;
1190 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1191 maxburst = atmci_convert_chksize(host,
1192 host->dma_conf.src_maxburst);
1193 } else {
1194 direction = DMA_TO_DEVICE;
1195 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1196 maxburst = atmci_convert_chksize(host,
1197 host->dma_conf.dst_maxburst);
1198 }
1199
1200 if (host->caps.has_dma_conf_reg)
1201 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1202 ATMCI_DMAEN);
1203
1204 sglen = dma_map_sg(chan->device->dev, data->sg,
1205 data->sg_len, direction);
1206
1207 dmaengine_slave_config(chan, &host->dma_conf);
1208 desc = dmaengine_prep_slave_sg(chan,
1209 data->sg, sglen, slave_dirn,
1210 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1211 if (!desc)
1212 goto unmap_exit;
1213
1214 host->dma.data_desc = desc;
1215 desc->callback = atmci_dma_complete;
1216 desc->callback_param = host;
1217
1218 return iflags;
1219 unmap_exit:
1220 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1221 return -ENOMEM;
1222 }
1223
1224 static void
1225 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1226 {
1227 return;
1228 }
1229
1230 /*
1231 * Start PDC according to transfer direction.
1232 */
1233 static void
1234 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1235 {
1236 if (data->flags & MMC_DATA_READ)
1237 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1238 else
1239 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1240 }
1241
1242 static void
1243 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1244 {
1245 struct dma_chan *chan = host->data_chan;
1246 struct dma_async_tx_descriptor *desc = host->dma.data_desc;
1247
1248 if (chan) {
1249 dmaengine_submit(desc);
1250 dma_async_issue_pending(chan);
1251 }
1252 }
1253
1254 static void atmci_stop_transfer(struct atmel_mci *host)
1255 {
1256 dev_dbg(&host->pdev->dev,
1257 "(%s) set pending xfer complete\n", __func__);
1258 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1259 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1260 }
1261
1262 /*
1263 * Stop data transfer because error(s) occurred.
1264 */
1265 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1266 {
1267 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1268 }
1269
1270 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1271 {
1272 struct dma_chan *chan = host->data_chan;
1273
1274 if (chan) {
1275 dmaengine_terminate_all(chan);
1276 atmci_dma_cleanup(host);
1277 } else {
1278 /* Data transfer was stopped by the interrupt handler */
1279 dev_dbg(&host->pdev->dev,
1280 "(%s) set pending xfer complete\n", __func__);
1281 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1282 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1283 }
1284 }
1285
1286 /*
1287 * Start a request: prepare data if needed, prepare the command and activate
1288 * interrupts.
1289 */
1290 static void atmci_start_request(struct atmel_mci *host,
1291 struct atmel_mci_slot *slot)
1292 {
1293 struct mmc_request *mrq;
1294 struct mmc_command *cmd;
1295 struct mmc_data *data;
1296 u32 iflags;
1297 u32 cmdflags;
1298
1299 mrq = slot->mrq;
1300 host->cur_slot = slot;
1301 host->mrq = mrq;
1302
1303 host->pending_events = 0;
1304 host->completed_events = 0;
1305 host->cmd_status = 0;
1306 host->data_status = 0;
1307
1308 dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1309
1310 if (host->need_reset || host->caps.need_reset_after_xfer) {
1311 iflags = atmci_readl(host, ATMCI_IMR);
1312 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1313 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1314 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1315 atmci_writel(host, ATMCI_MR, host->mode_reg);
1316 if (host->caps.has_cfg_reg)
1317 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1318 atmci_writel(host, ATMCI_IER, iflags);
1319 host->need_reset = false;
1320 }
1321 atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1322
1323 iflags = atmci_readl(host, ATMCI_IMR);
1324 if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1325 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1326 iflags);
1327
1328 if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1329 /* Send init sequence (74 clock cycles) */
1330 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1331 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1332 cpu_relax();
1333 }
1334 iflags = 0;
1335 data = mrq->data;
1336 if (data) {
1337 atmci_set_timeout(host, slot, data);
1338
1339 /* Must set block count/size before sending command */
1340 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1341 | ATMCI_BLKLEN(data->blksz));
1342 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1343 ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1344
1345 iflags |= host->prepare_data(host, data);
1346 }
1347
1348 iflags |= ATMCI_CMDRDY;
1349 cmd = mrq->cmd;
1350 cmdflags = atmci_prepare_command(slot->mmc, cmd);
1351
1352 /*
1353 * DMA transfer should be started before sending the command to avoid
1354 * unexpected errors especially for read operations in SDIO mode.
1355 * Unfortunately, in PDC mode, command has to be sent before starting
1356 * the transfer.
1357 */
1358 if (host->submit_data != &atmci_submit_data_dma)
1359 atmci_send_command(host, cmd, cmdflags);
1360
1361 if (data)
1362 host->submit_data(host, data);
1363
1364 if (host->submit_data == &atmci_submit_data_dma)
1365 atmci_send_command(host, cmd, cmdflags);
1366
1367 if (mrq->stop) {
1368 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1369 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1370 if (!(data->flags & MMC_DATA_WRITE))
1371 host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1372 host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1373 }
1374
1375 /*
1376 * We could have enabled interrupts earlier, but I suspect
1377 * that would open up a nice can of interesting race
1378 * conditions (e.g. command and data complete, but stop not
1379 * prepared yet.)
1380 */
1381 atmci_writel(host, ATMCI_IER, iflags);
1382
1383 mod_timer(&host->timer, jiffies + msecs_to_jiffies(2000));
1384 }
1385
1386 static void atmci_queue_request(struct atmel_mci *host,
1387 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1388 {
1389 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1390 host->state);
1391
1392 spin_lock_bh(&host->lock);
1393 slot->mrq = mrq;
1394 if (host->state == STATE_IDLE) {
1395 host->state = STATE_SENDING_CMD;
1396 atmci_start_request(host, slot);
1397 } else {
1398 dev_dbg(&host->pdev->dev, "queue request\n");
1399 list_add_tail(&slot->queue_node, &host->queue);
1400 }
1401 spin_unlock_bh(&host->lock);
1402 }
1403
1404 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1405 {
1406 struct atmel_mci_slot *slot = mmc_priv(mmc);
1407 struct atmel_mci *host = slot->host;
1408 struct mmc_data *data;
1409
1410 WARN_ON(slot->mrq);
1411 dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1412
1413 pm_runtime_get_sync(&host->pdev->dev);
1414
1415 /*
1416 * We may "know" the card is gone even though there's still an
1417 * electrical connection. If so, we really need to communicate
1418 * this to the MMC core since there won't be any more
1419 * interrupts as the card is completely removed. Otherwise,
1420 * the MMC core might believe the card is still there even
1421 * though the card was just removed very slowly.
1422 */
1423 if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1424 mrq->cmd->error = -ENOMEDIUM;
1425 mmc_request_done(mmc, mrq);
1426 return;
1427 }
1428
1429 /* We don't support multiple blocks of weird lengths. */
1430 data = mrq->data;
1431 if (data && data->blocks > 1 && data->blksz & 3) {
1432 mrq->cmd->error = -EINVAL;
1433 mmc_request_done(mmc, mrq);
1434 }
1435
1436 atmci_queue_request(host, slot, mrq);
1437 }
1438
1439 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1440 {
1441 struct atmel_mci_slot *slot = mmc_priv(mmc);
1442 struct atmel_mci *host = slot->host;
1443 unsigned int i;
1444
1445 pm_runtime_get_sync(&host->pdev->dev);
1446
1447 slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1448 switch (ios->bus_width) {
1449 case MMC_BUS_WIDTH_1:
1450 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1451 break;
1452 case MMC_BUS_WIDTH_4:
1453 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1454 break;
1455 }
1456
1457 if (ios->clock) {
1458 unsigned int clock_min = ~0U;
1459 int clkdiv;
1460
1461 spin_lock_bh(&host->lock);
1462 if (!host->mode_reg) {
1463 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1464 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1465 if (host->caps.has_cfg_reg)
1466 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1467 }
1468
1469 /*
1470 * Use mirror of ios->clock to prevent race with mmc
1471 * core ios update when finding the minimum.
1472 */
1473 slot->clock = ios->clock;
1474 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1475 if (host->slot[i] && host->slot[i]->clock
1476 && host->slot[i]->clock < clock_min)
1477 clock_min = host->slot[i]->clock;
1478 }
1479
1480 /* Calculate clock divider */
1481 if (host->caps.has_odd_clk_div) {
1482 clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1483 if (clkdiv < 0) {
1484 dev_warn(&mmc->class_dev,
1485 "clock %u too fast; using %lu\n",
1486 clock_min, host->bus_hz / 2);
1487 clkdiv = 0;
1488 } else if (clkdiv > 511) {
1489 dev_warn(&mmc->class_dev,
1490 "clock %u too slow; using %lu\n",
1491 clock_min, host->bus_hz / (511 + 2));
1492 clkdiv = 511;
1493 }
1494 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1495 | ATMCI_MR_CLKODD(clkdiv & 1);
1496 } else {
1497 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1498 if (clkdiv > 255) {
1499 dev_warn(&mmc->class_dev,
1500 "clock %u too slow; using %lu\n",
1501 clock_min, host->bus_hz / (2 * 256));
1502 clkdiv = 255;
1503 }
1504 host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1505 }
1506
1507 /*
1508 * WRPROOF and RDPROOF prevent overruns/underruns by
1509 * stopping the clock when the FIFO is full/empty.
1510 * This state is not expected to last for long.
1511 */
1512 if (host->caps.has_rwproof)
1513 host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1514
1515 if (host->caps.has_cfg_reg) {
1516 /* setup High Speed mode in relation with card capacity */
1517 if (ios->timing == MMC_TIMING_SD_HS)
1518 host->cfg_reg |= ATMCI_CFG_HSMODE;
1519 else
1520 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1521 }
1522
1523 if (list_empty(&host->queue)) {
1524 atmci_writel(host, ATMCI_MR, host->mode_reg);
1525 if (host->caps.has_cfg_reg)
1526 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1527 } else {
1528 host->need_clock_update = true;
1529 }
1530
1531 spin_unlock_bh(&host->lock);
1532 } else {
1533 bool any_slot_active = false;
1534
1535 spin_lock_bh(&host->lock);
1536 slot->clock = 0;
1537 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1538 if (host->slot[i] && host->slot[i]->clock) {
1539 any_slot_active = true;
1540 break;
1541 }
1542 }
1543 if (!any_slot_active) {
1544 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1545 if (host->mode_reg) {
1546 atmci_readl(host, ATMCI_MR);
1547 }
1548 host->mode_reg = 0;
1549 }
1550 spin_unlock_bh(&host->lock);
1551 }
1552
1553 switch (ios->power_mode) {
1554 case MMC_POWER_OFF:
1555 if (!IS_ERR(mmc->supply.vmmc))
1556 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1557 break;
1558 case MMC_POWER_UP:
1559 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1560 if (!IS_ERR(mmc->supply.vmmc))
1561 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1562 break;
1563 default:
1564 /*
1565 * TODO: None of the currently available AVR32-based
1566 * boards allow MMC power to be turned off. Implement
1567 * power control when this can be tested properly.
1568 *
1569 * We also need to hook this into the clock management
1570 * somehow so that newly inserted cards aren't
1571 * subjected to a fast clock before we have a chance
1572 * to figure out what the maximum rate is. Currently,
1573 * there's no way to avoid this, and there never will
1574 * be for boards that don't support power control.
1575 */
1576 break;
1577 }
1578
1579 pm_runtime_mark_last_busy(&host->pdev->dev);
1580 pm_runtime_put_autosuspend(&host->pdev->dev);
1581 }
1582
1583 static int atmci_get_ro(struct mmc_host *mmc)
1584 {
1585 int read_only = -ENOSYS;
1586 struct atmel_mci_slot *slot = mmc_priv(mmc);
1587
1588 if (gpio_is_valid(slot->wp_pin)) {
1589 read_only = gpio_get_value(slot->wp_pin);
1590 dev_dbg(&mmc->class_dev, "card is %s\n",
1591 read_only ? "read-only" : "read-write");
1592 }
1593
1594 return read_only;
1595 }
1596
1597 static int atmci_get_cd(struct mmc_host *mmc)
1598 {
1599 int present = -ENOSYS;
1600 struct atmel_mci_slot *slot = mmc_priv(mmc);
1601
1602 if (gpio_is_valid(slot->detect_pin)) {
1603 present = !(gpio_get_value(slot->detect_pin) ^
1604 slot->detect_is_active_high);
1605 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1606 present ? "" : "not ");
1607 }
1608
1609 return present;
1610 }
1611
1612 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1613 {
1614 struct atmel_mci_slot *slot = mmc_priv(mmc);
1615 struct atmel_mci *host = slot->host;
1616
1617 if (enable)
1618 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1619 else
1620 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1621 }
1622
1623 static const struct mmc_host_ops atmci_ops = {
1624 .request = atmci_request,
1625 .set_ios = atmci_set_ios,
1626 .get_ro = atmci_get_ro,
1627 .get_cd = atmci_get_cd,
1628 .enable_sdio_irq = atmci_enable_sdio_irq,
1629 };
1630
1631 /* Called with host->lock held */
1632 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1633 __releases(&host->lock)
1634 __acquires(&host->lock)
1635 {
1636 struct atmel_mci_slot *slot = NULL;
1637 struct mmc_host *prev_mmc = host->cur_slot->mmc;
1638
1639 WARN_ON(host->cmd || host->data);
1640
1641 /*
1642 * Update the MMC clock rate if necessary. This may be
1643 * necessary if set_ios() is called when a different slot is
1644 * busy transferring data.
1645 */
1646 if (host->need_clock_update) {
1647 atmci_writel(host, ATMCI_MR, host->mode_reg);
1648 if (host->caps.has_cfg_reg)
1649 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1650 }
1651
1652 host->cur_slot->mrq = NULL;
1653 host->mrq = NULL;
1654 if (!list_empty(&host->queue)) {
1655 slot = list_entry(host->queue.next,
1656 struct atmel_mci_slot, queue_node);
1657 list_del(&slot->queue_node);
1658 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1659 mmc_hostname(slot->mmc));
1660 host->state = STATE_SENDING_CMD;
1661 atmci_start_request(host, slot);
1662 } else {
1663 dev_vdbg(&host->pdev->dev, "list empty\n");
1664 host->state = STATE_IDLE;
1665 }
1666
1667 del_timer(&host->timer);
1668
1669 spin_unlock(&host->lock);
1670 mmc_request_done(prev_mmc, mrq);
1671 spin_lock(&host->lock);
1672
1673 pm_runtime_mark_last_busy(&host->pdev->dev);
1674 pm_runtime_put_autosuspend(&host->pdev->dev);
1675 }
1676
1677 static void atmci_command_complete(struct atmel_mci *host,
1678 struct mmc_command *cmd)
1679 {
1680 u32 status = host->cmd_status;
1681
1682 /* Read the response from the card (up to 16 bytes) */
1683 cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1684 cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1685 cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1686 cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1687
1688 if (status & ATMCI_RTOE)
1689 cmd->error = -ETIMEDOUT;
1690 else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1691 cmd->error = -EILSEQ;
1692 else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1693 cmd->error = -EIO;
1694 else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1695 if (host->caps.need_blksz_mul_4) {
1696 cmd->error = -EINVAL;
1697 host->need_reset = 1;
1698 }
1699 } else
1700 cmd->error = 0;
1701 }
1702
1703 static void atmci_detect_change(unsigned long data)
1704 {
1705 struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data;
1706 bool present;
1707 bool present_old;
1708
1709 /*
1710 * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1711 * freeing the interrupt. We must not re-enable the interrupt
1712 * if it has been freed, and if we're shutting down, it
1713 * doesn't really matter whether the card is present or not.
1714 */
1715 smp_rmb();
1716 if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1717 return;
1718
1719 enable_irq(gpio_to_irq(slot->detect_pin));
1720 present = !(gpio_get_value(slot->detect_pin) ^
1721 slot->detect_is_active_high);
1722 present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1723
1724 dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1725 present, present_old);
1726
1727 if (present != present_old) {
1728 struct atmel_mci *host = slot->host;
1729 struct mmc_request *mrq;
1730
1731 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1732 present ? "inserted" : "removed");
1733
1734 spin_lock(&host->lock);
1735
1736 if (!present)
1737 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1738 else
1739 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1740
1741 /* Clean up queue if present */
1742 mrq = slot->mrq;
1743 if (mrq) {
1744 if (mrq == host->mrq) {
1745 /*
1746 * Reset controller to terminate any ongoing
1747 * commands or data transfers.
1748 */
1749 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1750 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1751 atmci_writel(host, ATMCI_MR, host->mode_reg);
1752 if (host->caps.has_cfg_reg)
1753 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1754
1755 host->data = NULL;
1756 host->cmd = NULL;
1757
1758 switch (host->state) {
1759 case STATE_IDLE:
1760 break;
1761 case STATE_SENDING_CMD:
1762 mrq->cmd->error = -ENOMEDIUM;
1763 if (mrq->data)
1764 host->stop_transfer(host);
1765 break;
1766 case STATE_DATA_XFER:
1767 mrq->data->error = -ENOMEDIUM;
1768 host->stop_transfer(host);
1769 break;
1770 case STATE_WAITING_NOTBUSY:
1771 mrq->data->error = -ENOMEDIUM;
1772 break;
1773 case STATE_SENDING_STOP:
1774 mrq->stop->error = -ENOMEDIUM;
1775 break;
1776 case STATE_END_REQUEST:
1777 break;
1778 }
1779
1780 atmci_request_end(host, mrq);
1781 } else {
1782 list_del(&slot->queue_node);
1783 mrq->cmd->error = -ENOMEDIUM;
1784 if (mrq->data)
1785 mrq->data->error = -ENOMEDIUM;
1786 if (mrq->stop)
1787 mrq->stop->error = -ENOMEDIUM;
1788
1789 spin_unlock(&host->lock);
1790 mmc_request_done(slot->mmc, mrq);
1791 spin_lock(&host->lock);
1792 }
1793 }
1794 spin_unlock(&host->lock);
1795
1796 mmc_detect_change(slot->mmc, 0);
1797 }
1798 }
1799
1800 static void atmci_tasklet_func(unsigned long priv)
1801 {
1802 struct atmel_mci *host = (struct atmel_mci *)priv;
1803 struct mmc_request *mrq = host->mrq;
1804 struct mmc_data *data = host->data;
1805 enum atmel_mci_state state = host->state;
1806 enum atmel_mci_state prev_state;
1807 u32 status;
1808
1809 spin_lock(&host->lock);
1810
1811 state = host->state;
1812
1813 dev_vdbg(&host->pdev->dev,
1814 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1815 state, host->pending_events, host->completed_events,
1816 atmci_readl(host, ATMCI_IMR));
1817
1818 do {
1819 prev_state = state;
1820 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1821
1822 switch (state) {
1823 case STATE_IDLE:
1824 break;
1825
1826 case STATE_SENDING_CMD:
1827 /*
1828 * Command has been sent, we are waiting for command
1829 * ready. Then we have three next states possible:
1830 * END_REQUEST by default, WAITING_NOTBUSY if it's a
1831 * command needing it or DATA_XFER if there is data.
1832 */
1833 dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1834 if (!atmci_test_and_clear_pending(host,
1835 EVENT_CMD_RDY))
1836 break;
1837
1838 dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1839 host->cmd = NULL;
1840 atmci_set_completed(host, EVENT_CMD_RDY);
1841 atmci_command_complete(host, mrq->cmd);
1842 if (mrq->data) {
1843 dev_dbg(&host->pdev->dev,
1844 "command with data transfer");
1845 /*
1846 * If there is a command error don't start
1847 * data transfer.
1848 */
1849 if (mrq->cmd->error) {
1850 host->stop_transfer(host);
1851 host->data = NULL;
1852 atmci_writel(host, ATMCI_IDR,
1853 ATMCI_TXRDY | ATMCI_RXRDY
1854 | ATMCI_DATA_ERROR_FLAGS);
1855 state = STATE_END_REQUEST;
1856 } else
1857 state = STATE_DATA_XFER;
1858 } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1859 dev_dbg(&host->pdev->dev,
1860 "command response need waiting notbusy");
1861 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1862 state = STATE_WAITING_NOTBUSY;
1863 } else
1864 state = STATE_END_REQUEST;
1865
1866 break;
1867
1868 case STATE_DATA_XFER:
1869 if (atmci_test_and_clear_pending(host,
1870 EVENT_DATA_ERROR)) {
1871 dev_dbg(&host->pdev->dev, "set completed data error\n");
1872 atmci_set_completed(host, EVENT_DATA_ERROR);
1873 state = STATE_END_REQUEST;
1874 break;
1875 }
1876
1877 /*
1878 * A data transfer is in progress. The event expected
1879 * to move to the next state depends of data transfer
1880 * type (PDC or DMA). Once transfer done we can move
1881 * to the next step which is WAITING_NOTBUSY in write
1882 * case and directly SENDING_STOP in read case.
1883 */
1884 dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1885 if (!atmci_test_and_clear_pending(host,
1886 EVENT_XFER_COMPLETE))
1887 break;
1888
1889 dev_dbg(&host->pdev->dev,
1890 "(%s) set completed xfer complete\n",
1891 __func__);
1892 atmci_set_completed(host, EVENT_XFER_COMPLETE);
1893
1894 if (host->caps.need_notbusy_for_read_ops ||
1895 (host->data->flags & MMC_DATA_WRITE)) {
1896 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1897 state = STATE_WAITING_NOTBUSY;
1898 } else if (host->mrq->stop) {
1899 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1900 atmci_send_stop_cmd(host, data);
1901 state = STATE_SENDING_STOP;
1902 } else {
1903 host->data = NULL;
1904 data->bytes_xfered = data->blocks * data->blksz;
1905 data->error = 0;
1906 state = STATE_END_REQUEST;
1907 }
1908 break;
1909
1910 case STATE_WAITING_NOTBUSY:
1911 /*
1912 * We can be in the state for two reasons: a command
1913 * requiring waiting not busy signal (stop command
1914 * included) or a write operation. In the latest case,
1915 * we need to send a stop command.
1916 */
1917 dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1918 if (!atmci_test_and_clear_pending(host,
1919 EVENT_NOTBUSY))
1920 break;
1921
1922 dev_dbg(&host->pdev->dev, "set completed not busy\n");
1923 atmci_set_completed(host, EVENT_NOTBUSY);
1924
1925 if (host->data) {
1926 /*
1927 * For some commands such as CMD53, even if
1928 * there is data transfer, there is no stop
1929 * command to send.
1930 */
1931 if (host->mrq->stop) {
1932 atmci_writel(host, ATMCI_IER,
1933 ATMCI_CMDRDY);
1934 atmci_send_stop_cmd(host, data);
1935 state = STATE_SENDING_STOP;
1936 } else {
1937 host->data = NULL;
1938 data->bytes_xfered = data->blocks
1939 * data->blksz;
1940 data->error = 0;
1941 state = STATE_END_REQUEST;
1942 }
1943 } else
1944 state = STATE_END_REQUEST;
1945 break;
1946
1947 case STATE_SENDING_STOP:
1948 /*
1949 * In this state, it is important to set host->data to
1950 * NULL (which is tested in the waiting notbusy state)
1951 * in order to go to the end request state instead of
1952 * sending stop again.
1953 */
1954 dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1955 if (!atmci_test_and_clear_pending(host,
1956 EVENT_CMD_RDY))
1957 break;
1958
1959 dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1960 host->cmd = NULL;
1961 data->bytes_xfered = data->blocks * data->blksz;
1962 data->error = 0;
1963 atmci_command_complete(host, mrq->stop);
1964 if (mrq->stop->error) {
1965 host->stop_transfer(host);
1966 atmci_writel(host, ATMCI_IDR,
1967 ATMCI_TXRDY | ATMCI_RXRDY
1968 | ATMCI_DATA_ERROR_FLAGS);
1969 state = STATE_END_REQUEST;
1970 } else {
1971 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1972 state = STATE_WAITING_NOTBUSY;
1973 }
1974 host->data = NULL;
1975 break;
1976
1977 case STATE_END_REQUEST:
1978 atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1979 | ATMCI_DATA_ERROR_FLAGS);
1980 status = host->data_status;
1981 if (unlikely(status)) {
1982 host->stop_transfer(host);
1983 host->data = NULL;
1984 if (data) {
1985 if (status & ATMCI_DTOE) {
1986 data->error = -ETIMEDOUT;
1987 } else if (status & ATMCI_DCRCE) {
1988 data->error = -EILSEQ;
1989 } else {
1990 data->error = -EIO;
1991 }
1992 }
1993 }
1994
1995 atmci_request_end(host, host->mrq);
1996 state = STATE_IDLE;
1997 break;
1998 }
1999 } while (state != prev_state);
2000
2001 host->state = state;
2002
2003 spin_unlock(&host->lock);
2004 }
2005
2006 static void atmci_read_data_pio(struct atmel_mci *host)
2007 {
2008 struct scatterlist *sg = host->sg;
2009 void *buf = sg_virt(sg);
2010 unsigned int offset = host->pio_offset;
2011 struct mmc_data *data = host->data;
2012 u32 value;
2013 u32 status;
2014 unsigned int nbytes = 0;
2015
2016 do {
2017 value = atmci_readl(host, ATMCI_RDR);
2018 if (likely(offset + 4 <= sg->length)) {
2019 put_unaligned(value, (u32 *)(buf + offset));
2020
2021 offset += 4;
2022 nbytes += 4;
2023
2024 if (offset == sg->length) {
2025 flush_dcache_page(sg_page(sg));
2026 host->sg = sg = sg_next(sg);
2027 host->sg_len--;
2028 if (!sg || !host->sg_len)
2029 goto done;
2030
2031 offset = 0;
2032 buf = sg_virt(sg);
2033 }
2034 } else {
2035 unsigned int remaining = sg->length - offset;
2036 memcpy(buf + offset, &value, remaining);
2037 nbytes += remaining;
2038
2039 flush_dcache_page(sg_page(sg));
2040 host->sg = sg = sg_next(sg);
2041 host->sg_len--;
2042 if (!sg || !host->sg_len)
2043 goto done;
2044
2045 offset = 4 - remaining;
2046 buf = sg_virt(sg);
2047 memcpy(buf, (u8 *)&value + remaining, offset);
2048 nbytes += offset;
2049 }
2050
2051 status = atmci_readl(host, ATMCI_SR);
2052 if (status & ATMCI_DATA_ERROR_FLAGS) {
2053 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
2054 | ATMCI_DATA_ERROR_FLAGS));
2055 host->data_status = status;
2056 data->bytes_xfered += nbytes;
2057 return;
2058 }
2059 } while (status & ATMCI_RXRDY);
2060
2061 host->pio_offset = offset;
2062 data->bytes_xfered += nbytes;
2063
2064 return;
2065
2066 done:
2067 atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
2068 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
2069 data->bytes_xfered += nbytes;
2070 smp_wmb();
2071 atmci_set_pending(host, EVENT_XFER_COMPLETE);
2072 }
2073
2074 static void atmci_write_data_pio(struct atmel_mci *host)
2075 {
2076 struct scatterlist *sg = host->sg;
2077 void *buf = sg_virt(sg);
2078 unsigned int offset = host->pio_offset;
2079 struct mmc_data *data = host->data;
2080 u32 value;
2081 u32 status;
2082 unsigned int nbytes = 0;
2083
2084 do {
2085 if (likely(offset + 4 <= sg->length)) {
2086 value = get_unaligned((u32 *)(buf + offset));
2087 atmci_writel(host, ATMCI_TDR, value);
2088
2089 offset += 4;
2090 nbytes += 4;
2091 if (offset == sg->length) {
2092 host->sg = sg = sg_next(sg);
2093 host->sg_len--;
2094 if (!sg || !host->sg_len)
2095 goto done;
2096
2097 offset = 0;
2098 buf = sg_virt(sg);
2099 }
2100 } else {
2101 unsigned int remaining = sg->length - offset;
2102
2103 value = 0;
2104 memcpy(&value, buf + offset, remaining);
2105 nbytes += remaining;
2106
2107 host->sg = sg = sg_next(sg);
2108 host->sg_len--;
2109 if (!sg || !host->sg_len) {
2110 atmci_writel(host, ATMCI_TDR, value);
2111 goto done;
2112 }
2113
2114 offset = 4 - remaining;
2115 buf = sg_virt(sg);
2116 memcpy((u8 *)&value + remaining, buf, offset);
2117 atmci_writel(host, ATMCI_TDR, value);
2118 nbytes += offset;
2119 }
2120
2121 status = atmci_readl(host, ATMCI_SR);
2122 if (status & ATMCI_DATA_ERROR_FLAGS) {
2123 atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
2124 | ATMCI_DATA_ERROR_FLAGS));
2125 host->data_status = status;
2126 data->bytes_xfered += nbytes;
2127 return;
2128 }
2129 } while (status & ATMCI_TXRDY);
2130
2131 host->pio_offset = offset;
2132 data->bytes_xfered += nbytes;
2133
2134 return;
2135
2136 done:
2137 atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
2138 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
2139 data->bytes_xfered += nbytes;
2140 smp_wmb();
2141 atmci_set_pending(host, EVENT_XFER_COMPLETE);
2142 }
2143
2144 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
2145 {
2146 int i;
2147
2148 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2149 struct atmel_mci_slot *slot = host->slot[i];
2150 if (slot && (status & slot->sdio_irq)) {
2151 mmc_signal_sdio_irq(slot->mmc);
2152 }
2153 }
2154 }
2155
2156
2157 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
2158 {
2159 struct atmel_mci *host = dev_id;
2160 u32 status, mask, pending;
2161 unsigned int pass_count = 0;
2162
2163 do {
2164 status = atmci_readl(host, ATMCI_SR);
2165 mask = atmci_readl(host, ATMCI_IMR);
2166 pending = status & mask;
2167 if (!pending)
2168 break;
2169
2170 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2171 dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2172 atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2173 | ATMCI_RXRDY | ATMCI_TXRDY
2174 | ATMCI_ENDRX | ATMCI_ENDTX
2175 | ATMCI_RXBUFF | ATMCI_TXBUFE);
2176
2177 host->data_status = status;
2178 dev_dbg(&host->pdev->dev, "set pending data error\n");
2179 smp_wmb();
2180 atmci_set_pending(host, EVENT_DATA_ERROR);
2181 tasklet_schedule(&host->tasklet);
2182 }
2183
2184 if (pending & ATMCI_TXBUFE) {
2185 dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2186 atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2187 atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2188 /*
2189 * We can receive this interruption before having configured
2190 * the second pdc buffer, so we need to reconfigure first and
2191 * second buffers again
2192 */
2193 if (host->data_size) {
2194 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2195 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2196 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2197 } else {
2198 atmci_pdc_complete(host);
2199 }
2200 } else if (pending & ATMCI_ENDTX) {
2201 dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2202 atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2203
2204 if (host->data_size) {
2205 atmci_pdc_set_single_buf(host,
2206 XFER_TRANSMIT, PDC_SECOND_BUF);
2207 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2208 }
2209 }
2210
2211 if (pending & ATMCI_RXBUFF) {
2212 dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2213 atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2214 atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2215 /*
2216 * We can receive this interruption before having configured
2217 * the second pdc buffer, so we need to reconfigure first and
2218 * second buffers again
2219 */
2220 if (host->data_size) {
2221 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2222 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2223 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2224 } else {
2225 atmci_pdc_complete(host);
2226 }
2227 } else if (pending & ATMCI_ENDRX) {
2228 dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2229 atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2230
2231 if (host->data_size) {
2232 atmci_pdc_set_single_buf(host,
2233 XFER_RECEIVE, PDC_SECOND_BUF);
2234 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2235 }
2236 }
2237
2238 /*
2239 * First mci IPs, so mainly the ones having pdc, have some
2240 * issues with the notbusy signal. You can't get it after
2241 * data transmission if you have not sent a stop command.
2242 * The appropriate workaround is to use the BLKE signal.
2243 */
2244 if (pending & ATMCI_BLKE) {
2245 dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2246 atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2247 smp_wmb();
2248 dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2249 atmci_set_pending(host, EVENT_NOTBUSY);
2250 tasklet_schedule(&host->tasklet);
2251 }
2252
2253 if (pending & ATMCI_NOTBUSY) {
2254 dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2255 atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2256 smp_wmb();
2257 dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2258 atmci_set_pending(host, EVENT_NOTBUSY);
2259 tasklet_schedule(&host->tasklet);
2260 }
2261
2262 if (pending & ATMCI_RXRDY)
2263 atmci_read_data_pio(host);
2264 if (pending & ATMCI_TXRDY)
2265 atmci_write_data_pio(host);
2266
2267 if (pending & ATMCI_CMDRDY) {
2268 dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2269 atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2270 host->cmd_status = status;
2271 smp_wmb();
2272 dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2273 atmci_set_pending(host, EVENT_CMD_RDY);
2274 tasklet_schedule(&host->tasklet);
2275 }
2276
2277 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2278 atmci_sdio_interrupt(host, status);
2279
2280 } while (pass_count++ < 5);
2281
2282 return pass_count ? IRQ_HANDLED : IRQ_NONE;
2283 }
2284
2285 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2286 {
2287 struct atmel_mci_slot *slot = dev_id;
2288
2289 /*
2290 * Disable interrupts until the pin has stabilized and check
2291 * the state then. Use mod_timer() since we may be in the
2292 * middle of the timer routine when this interrupt triggers.
2293 */
2294 disable_irq_nosync(irq);
2295 mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2296
2297 return IRQ_HANDLED;
2298 }
2299
2300 static int atmci_init_slot(struct atmel_mci *host,
2301 struct mci_slot_pdata *slot_data, unsigned int id,
2302 u32 sdc_reg, u32 sdio_irq)
2303 {
2304 struct mmc_host *mmc;
2305 struct atmel_mci_slot *slot;
2306
2307 mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2308 if (!mmc)
2309 return -ENOMEM;
2310
2311 slot = mmc_priv(mmc);
2312 slot->mmc = mmc;
2313 slot->host = host;
2314 slot->detect_pin = slot_data->detect_pin;
2315 slot->wp_pin = slot_data->wp_pin;
2316 slot->detect_is_active_high = slot_data->detect_is_active_high;
2317 slot->sdc_reg = sdc_reg;
2318 slot->sdio_irq = sdio_irq;
2319
2320 dev_dbg(&mmc->class_dev,
2321 "slot[%u]: bus_width=%u, detect_pin=%d, "
2322 "detect_is_active_high=%s, wp_pin=%d\n",
2323 id, slot_data->bus_width, slot_data->detect_pin,
2324 slot_data->detect_is_active_high ? "true" : "false",
2325 slot_data->wp_pin);
2326
2327 mmc->ops = &atmci_ops;
2328 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2329 mmc->f_max = host->bus_hz / 2;
2330 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
2331 if (sdio_irq)
2332 mmc->caps |= MMC_CAP_SDIO_IRQ;
2333 if (host->caps.has_highspeed)
2334 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2335 /*
2336 * Without the read/write proof capability, it is strongly suggested to
2337 * use only one bit for data to prevent fifo underruns and overruns
2338 * which will corrupt data.
2339 */
2340 if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2341 mmc->caps |= MMC_CAP_4_BIT_DATA;
2342
2343 if (atmci_get_version(host) < 0x200) {
2344 mmc->max_segs = 256;
2345 mmc->max_blk_size = 4095;
2346 mmc->max_blk_count = 256;
2347 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2348 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2349 } else {
2350 mmc->max_segs = 64;
2351 mmc->max_req_size = 32768 * 512;
2352 mmc->max_blk_size = 32768;
2353 mmc->max_blk_count = 512;
2354 }
2355
2356 /* Assume card is present initially */
2357 set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2358 if (gpio_is_valid(slot->detect_pin)) {
2359 if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
2360 "mmc_detect")) {
2361 dev_dbg(&mmc->class_dev, "no detect pin available\n");
2362 slot->detect_pin = -EBUSY;
2363 } else if (gpio_get_value(slot->detect_pin) ^
2364 slot->detect_is_active_high) {
2365 clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2366 }
2367 }
2368
2369 if (!gpio_is_valid(slot->detect_pin)) {
2370 if (slot_data->non_removable)
2371 mmc->caps |= MMC_CAP_NONREMOVABLE;
2372 else
2373 mmc->caps |= MMC_CAP_NEEDS_POLL;
2374 }
2375
2376 if (gpio_is_valid(slot->wp_pin)) {
2377 if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
2378 "mmc_wp")) {
2379 dev_dbg(&mmc->class_dev, "no WP pin available\n");
2380 slot->wp_pin = -EBUSY;
2381 }
2382 }
2383
2384 host->slot[id] = slot;
2385 mmc_regulator_get_supply(mmc);
2386 mmc_add_host(mmc);
2387
2388 if (gpio_is_valid(slot->detect_pin)) {
2389 int ret;
2390
2391 setup_timer(&slot->detect_timer, atmci_detect_change,
2392 (unsigned long)slot);
2393
2394 ret = request_irq(gpio_to_irq(slot->detect_pin),
2395 atmci_detect_interrupt,
2396 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2397 "mmc-detect", slot);
2398 if (ret) {
2399 dev_dbg(&mmc->class_dev,
2400 "could not request IRQ %d for detect pin\n",
2401 gpio_to_irq(slot->detect_pin));
2402 slot->detect_pin = -EBUSY;
2403 }
2404 }
2405
2406 atmci_init_debugfs(slot);
2407
2408 return 0;
2409 }
2410
2411 static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
2412 unsigned int id)
2413 {
2414 /* Debugfs stuff is cleaned up by mmc core */
2415
2416 set_bit(ATMCI_SHUTDOWN, &slot->flags);
2417 smp_wmb();
2418
2419 mmc_remove_host(slot->mmc);
2420
2421 if (gpio_is_valid(slot->detect_pin)) {
2422 int pin = slot->detect_pin;
2423
2424 free_irq(gpio_to_irq(pin), slot);
2425 del_timer_sync(&slot->detect_timer);
2426 }
2427
2428 slot->host->slot[id] = NULL;
2429 mmc_free_host(slot->mmc);
2430 }
2431
2432 static int atmci_configure_dma(struct atmel_mci *host)
2433 {
2434 host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev,
2435 "rxtx");
2436
2437 if (PTR_ERR(host->dma.chan) == -ENODEV) {
2438 struct mci_platform_data *pdata = host->pdev->dev.platform_data;
2439 dma_cap_mask_t mask;
2440
2441 if (!pdata || !pdata->dma_filter)
2442 return -ENODEV;
2443
2444 dma_cap_zero(mask);
2445 dma_cap_set(DMA_SLAVE, mask);
2446
2447 host->dma.chan = dma_request_channel(mask, pdata->dma_filter,
2448 pdata->dma_slave);
2449 if (!host->dma.chan)
2450 host->dma.chan = ERR_PTR(-ENODEV);
2451 }
2452
2453 if (IS_ERR(host->dma.chan))
2454 return PTR_ERR(host->dma.chan);
2455
2456 dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
2457 dma_chan_name(host->dma.chan));
2458
2459 host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2460 host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2461 host->dma_conf.src_maxburst = 1;
2462 host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2463 host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2464 host->dma_conf.dst_maxburst = 1;
2465 host->dma_conf.device_fc = false;
2466
2467 return 0;
2468 }
2469
2470 /*
2471 * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2472 * HSMCI provides DMA support and a new config register but no more supports
2473 * PDC.
2474 */
2475 static void atmci_get_cap(struct atmel_mci *host)
2476 {
2477 unsigned int version;
2478
2479 version = atmci_get_version(host);
2480 dev_info(&host->pdev->dev,
2481 "version: 0x%x\n", version);
2482
2483 host->caps.has_dma_conf_reg = 0;
2484 host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2485 host->caps.has_cfg_reg = 0;
2486 host->caps.has_cstor_reg = 0;
2487 host->caps.has_highspeed = 0;
2488 host->caps.has_rwproof = 0;
2489 host->caps.has_odd_clk_div = 0;
2490 host->caps.has_bad_data_ordering = 1;
2491 host->caps.need_reset_after_xfer = 1;
2492 host->caps.need_blksz_mul_4 = 1;
2493 host->caps.need_notbusy_for_read_ops = 0;
2494
2495 /* keep only major version number */
2496 switch (version & 0xf00) {
2497 case 0x600:
2498 case 0x500:
2499 host->caps.has_odd_clk_div = 1;
2500 case 0x400:
2501 case 0x300:
2502 host->caps.has_dma_conf_reg = 1;
2503 host->caps.has_pdc = 0;
2504 host->caps.has_cfg_reg = 1;
2505 host->caps.has_cstor_reg = 1;
2506 host->caps.has_highspeed = 1;
2507 case 0x200:
2508 host->caps.has_rwproof = 1;
2509 host->caps.need_blksz_mul_4 = 0;
2510 host->caps.need_notbusy_for_read_ops = 1;
2511 case 0x100:
2512 host->caps.has_bad_data_ordering = 0;
2513 host->caps.need_reset_after_xfer = 0;
2514 case 0x0:
2515 break;
2516 default:
2517 host->caps.has_pdc = 0;
2518 dev_warn(&host->pdev->dev,
2519 "Unmanaged mci version, set minimum capabilities\n");
2520 break;
2521 }
2522 }
2523
2524 static int atmci_probe(struct platform_device *pdev)
2525 {
2526 struct mci_platform_data *pdata;
2527 struct atmel_mci *host;
2528 struct resource *regs;
2529 unsigned int nr_slots;
2530 int irq;
2531 int ret, i;
2532
2533 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2534 if (!regs)
2535 return -ENXIO;
2536 pdata = pdev->dev.platform_data;
2537 if (!pdata) {
2538 pdata = atmci_of_init(pdev);
2539 if (IS_ERR(pdata)) {
2540 dev_err(&pdev->dev, "platform data not available\n");
2541 return PTR_ERR(pdata);
2542 }
2543 }
2544
2545 irq = platform_get_irq(pdev, 0);
2546 if (irq < 0)
2547 return irq;
2548
2549 host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2550 if (!host)
2551 return -ENOMEM;
2552
2553 host->pdev = pdev;
2554 spin_lock_init(&host->lock);
2555 INIT_LIST_HEAD(&host->queue);
2556
2557 host->mck = devm_clk_get(&pdev->dev, "mci_clk");
2558 if (IS_ERR(host->mck))
2559 return PTR_ERR(host->mck);
2560
2561 host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2562 if (!host->regs)
2563 return -ENOMEM;
2564
2565 ret = clk_prepare_enable(host->mck);
2566 if (ret)
2567 return ret;
2568
2569 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2570 host->bus_hz = clk_get_rate(host->mck);
2571
2572 host->mapbase = regs->start;
2573
2574 tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2575
2576 ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2577 if (ret) {
2578 clk_disable_unprepare(host->mck);
2579 return ret;
2580 }
2581
2582 /* Get MCI capabilities and set operations according to it */
2583 atmci_get_cap(host);
2584 ret = atmci_configure_dma(host);
2585 if (ret == -EPROBE_DEFER)
2586 goto err_dma_probe_defer;
2587 if (ret == 0) {
2588 host->prepare_data = &atmci_prepare_data_dma;
2589 host->submit_data = &atmci_submit_data_dma;
2590 host->stop_transfer = &atmci_stop_transfer_dma;
2591 } else if (host->caps.has_pdc) {
2592 dev_info(&pdev->dev, "using PDC\n");
2593 host->prepare_data = &atmci_prepare_data_pdc;
2594 host->submit_data = &atmci_submit_data_pdc;
2595 host->stop_transfer = &atmci_stop_transfer_pdc;
2596 } else {
2597 dev_info(&pdev->dev, "using PIO\n");
2598 host->prepare_data = &atmci_prepare_data;
2599 host->submit_data = &atmci_submit_data;
2600 host->stop_transfer = &atmci_stop_transfer;
2601 }
2602
2603 platform_set_drvdata(pdev, host);
2604
2605 setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2606
2607 pm_runtime_get_noresume(&pdev->dev);
2608 pm_runtime_set_active(&pdev->dev);
2609 pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_DELAY);
2610 pm_runtime_use_autosuspend(&pdev->dev);
2611 pm_runtime_enable(&pdev->dev);
2612
2613 /* We need at least one slot to succeed */
2614 nr_slots = 0;
2615 ret = -ENODEV;
2616 if (pdata->slot[0].bus_width) {
2617 ret = atmci_init_slot(host, &pdata->slot[0],
2618 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2619 if (!ret) {
2620 nr_slots++;
2621 host->buf_size = host->slot[0]->mmc->max_req_size;
2622 }
2623 }
2624 if (pdata->slot[1].bus_width) {
2625 ret = atmci_init_slot(host, &pdata->slot[1],
2626 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2627 if (!ret) {
2628 nr_slots++;
2629 if (host->slot[1]->mmc->max_req_size > host->buf_size)
2630 host->buf_size =
2631 host->slot[1]->mmc->max_req_size;
2632 }
2633 }
2634
2635 if (!nr_slots) {
2636 dev_err(&pdev->dev, "init failed: no slot defined\n");
2637 goto err_init_slot;
2638 }
2639
2640 if (!host->caps.has_rwproof) {
2641 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2642 &host->buf_phys_addr,
2643 GFP_KERNEL);
2644 if (!host->buffer) {
2645 ret = -ENOMEM;
2646 dev_err(&pdev->dev, "buffer allocation failed\n");
2647 goto err_dma_alloc;
2648 }
2649 }
2650
2651 dev_info(&pdev->dev,
2652 "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2653 host->mapbase, irq, nr_slots);
2654
2655 pm_runtime_mark_last_busy(&host->pdev->dev);
2656 pm_runtime_put_autosuspend(&pdev->dev);
2657
2658 return 0;
2659
2660 err_dma_alloc:
2661 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2662 if (host->slot[i])
2663 atmci_cleanup_slot(host->slot[i], i);
2664 }
2665 err_init_slot:
2666 clk_disable_unprepare(host->mck);
2667
2668 pm_runtime_disable(&pdev->dev);
2669 pm_runtime_put_noidle(&pdev->dev);
2670
2671 del_timer_sync(&host->timer);
2672 if (!IS_ERR(host->dma.chan))
2673 dma_release_channel(host->dma.chan);
2674 err_dma_probe_defer:
2675 free_irq(irq, host);
2676 return ret;
2677 }
2678
2679 static int atmci_remove(struct platform_device *pdev)
2680 {
2681 struct atmel_mci *host = platform_get_drvdata(pdev);
2682 unsigned int i;
2683
2684 pm_runtime_get_sync(&pdev->dev);
2685
2686 if (host->buffer)
2687 dma_free_coherent(&pdev->dev, host->buf_size,
2688 host->buffer, host->buf_phys_addr);
2689
2690 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2691 if (host->slot[i])
2692 atmci_cleanup_slot(host->slot[i], i);
2693 }
2694
2695 atmci_writel(host, ATMCI_IDR, ~0UL);
2696 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2697 atmci_readl(host, ATMCI_SR);
2698
2699 del_timer_sync(&host->timer);
2700 if (!IS_ERR(host->dma.chan))
2701 dma_release_channel(host->dma.chan);
2702
2703 free_irq(platform_get_irq(pdev, 0), host);
2704
2705 clk_disable_unprepare(host->mck);
2706
2707 pm_runtime_disable(&pdev->dev);
2708 pm_runtime_put_noidle(&pdev->dev);
2709
2710 return 0;
2711 }
2712
2713 #ifdef CONFIG_PM
2714 static int atmci_runtime_suspend(struct device *dev)
2715 {
2716 struct atmel_mci *host = dev_get_drvdata(dev);
2717
2718 clk_disable_unprepare(host->mck);
2719
2720 pinctrl_pm_select_sleep_state(dev);
2721
2722 return 0;
2723 }
2724
2725 static int atmci_runtime_resume(struct device *dev)
2726 {
2727 struct atmel_mci *host = dev_get_drvdata(dev);
2728
2729 pinctrl_pm_select_default_state(dev);
2730
2731 return clk_prepare_enable(host->mck);
2732 }
2733 #endif
2734
2735 static const struct dev_pm_ops atmci_dev_pm_ops = {
2736 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2737 pm_runtime_force_resume)
2738 SET_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
2739 };
2740
2741 static struct platform_driver atmci_driver = {
2742 .probe = atmci_probe,
2743 .remove = atmci_remove,
2744 .driver = {
2745 .name = "atmel_mci",
2746 .of_match_table = of_match_ptr(atmci_dt_ids),
2747 .pm = &atmci_dev_pm_ops,
2748 },
2749 };
2750 module_platform_driver(atmci_driver);
2751
2752 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2753 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2754 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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