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Merge branch 'stable-4.6' of git://git.infradead.org/users/pcmoore/selinux into next
[deliverable/linux.git] / drivers / mmc / host / mvsdio.c
1 /*
2 * Marvell MMC/SD/SDIO driver
3 *
4 * Authors: Maen Suleiman, Nicolas Pitre
5 * Copyright (C) 2008-2009 Marvell Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/platform_device.h>
16 #include <linux/mbus.h>
17 #include <linux/delay.h>
18 #include <linux/interrupt.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/scatterlist.h>
21 #include <linux/irq.h>
22 #include <linux/clk.h>
23 #include <linux/of_irq.h>
24 #include <linux/mmc/host.h>
25 #include <linux/mmc/slot-gpio.h>
26
27 #include <asm/sizes.h>
28 #include <asm/unaligned.h>
29
30 #include "mvsdio.h"
31
32 #define DRIVER_NAME "mvsdio"
33
34 static int maxfreq;
35 static int nodma;
36
37 struct mvsd_host {
38 void __iomem *base;
39 struct mmc_request *mrq;
40 spinlock_t lock;
41 unsigned int xfer_mode;
42 unsigned int intr_en;
43 unsigned int ctrl;
44 unsigned int pio_size;
45 void *pio_ptr;
46 unsigned int sg_frags;
47 unsigned int ns_per_clk;
48 unsigned int clock;
49 unsigned int base_clock;
50 struct timer_list timer;
51 struct mmc_host *mmc;
52 struct device *dev;
53 struct clk *clk;
54 };
55
56 #define mvsd_write(offs, val) writel(val, iobase + (offs))
57 #define mvsd_read(offs) readl(iobase + (offs))
58
59 static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
60 {
61 void __iomem *iobase = host->base;
62 unsigned int tmout;
63 int tmout_index;
64
65 /*
66 * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE
67 * register is sometimes not set before a while when some
68 * "unusual" data block sizes are used (such as with the SWITCH
69 * command), even despite the fact that the XFER_DONE interrupt
70 * was raised. And if another data transfer starts before
71 * this bit comes to good sense (which eventually happens by
72 * itself) then the new transfer simply fails with a timeout.
73 */
74 if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) {
75 unsigned long t = jiffies + HZ;
76 unsigned int hw_state, count = 0;
77 do {
78 hw_state = mvsd_read(MVSD_HW_STATE);
79 if (time_after(jiffies, t)) {
80 dev_warn(host->dev, "FIFO_EMPTY bit missing\n");
81 break;
82 }
83 count++;
84 } while (!(hw_state & (1 << 13)));
85 dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit "
86 "(hw=0x%04x, count=%d, jiffies=%ld)\n",
87 hw_state, count, jiffies - (t - HZ));
88 }
89
90 /* If timeout=0 then maximum timeout index is used. */
91 tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
92 tmout += data->timeout_clks;
93 tmout_index = fls(tmout - 1) - 12;
94 if (tmout_index < 0)
95 tmout_index = 0;
96 if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
97 tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
98
99 dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
100 (data->flags & MMC_DATA_READ) ? "read" : "write",
101 (u32)sg_virt(data->sg), data->blocks, data->blksz,
102 tmout, tmout_index);
103
104 host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
105 host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
106 mvsd_write(MVSD_HOST_CTRL, host->ctrl);
107 mvsd_write(MVSD_BLK_COUNT, data->blocks);
108 mvsd_write(MVSD_BLK_SIZE, data->blksz);
109
110 if (nodma || (data->blksz | data->sg->offset) & 3 ||
111 ((!(data->flags & MMC_DATA_READ) && data->sg->offset & 0x3f))) {
112 /*
113 * We cannot do DMA on a buffer which offset or size
114 * is not aligned on a 4-byte boundary.
115 *
116 * It also appears the host to card DMA can corrupt
117 * data when the buffer is not aligned on a 64 byte
118 * boundary.
119 */
120 host->pio_size = data->blocks * data->blksz;
121 host->pio_ptr = sg_virt(data->sg);
122 if (!nodma)
123 dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n",
124 host->pio_ptr, host->pio_size);
125 return 1;
126 } else {
127 dma_addr_t phys_addr;
128 int dma_dir = (data->flags & MMC_DATA_READ) ?
129 DMA_FROM_DEVICE : DMA_TO_DEVICE;
130 host->sg_frags = dma_map_sg(mmc_dev(host->mmc), data->sg,
131 data->sg_len, dma_dir);
132 phys_addr = sg_dma_address(data->sg);
133 mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
134 mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
135 return 0;
136 }
137 }
138
139 static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
140 {
141 struct mvsd_host *host = mmc_priv(mmc);
142 void __iomem *iobase = host->base;
143 struct mmc_command *cmd = mrq->cmd;
144 u32 cmdreg = 0, xfer = 0, intr = 0;
145 unsigned long flags;
146
147 BUG_ON(host->mrq != NULL);
148 host->mrq = mrq;
149
150 dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
151 cmd->opcode, mvsd_read(MVSD_HW_STATE));
152
153 cmdreg = MVSD_CMD_INDEX(cmd->opcode);
154
155 if (cmd->flags & MMC_RSP_BUSY)
156 cmdreg |= MVSD_CMD_RSP_48BUSY;
157 else if (cmd->flags & MMC_RSP_136)
158 cmdreg |= MVSD_CMD_RSP_136;
159 else if (cmd->flags & MMC_RSP_PRESENT)
160 cmdreg |= MVSD_CMD_RSP_48;
161 else
162 cmdreg |= MVSD_CMD_RSP_NONE;
163
164 if (cmd->flags & MMC_RSP_CRC)
165 cmdreg |= MVSD_CMD_CHECK_CMDCRC;
166
167 if (cmd->flags & MMC_RSP_OPCODE)
168 cmdreg |= MVSD_CMD_INDX_CHECK;
169
170 if (cmd->flags & MMC_RSP_PRESENT) {
171 cmdreg |= MVSD_UNEXPECTED_RESP;
172 intr |= MVSD_NOR_UNEXP_RSP;
173 }
174
175 if (mrq->data) {
176 struct mmc_data *data = mrq->data;
177 int pio;
178
179 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
180 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
181 if (data->flags & MMC_DATA_READ)
182 xfer |= MVSD_XFER_MODE_TO_HOST;
183
184 pio = mvsd_setup_data(host, data);
185 if (pio) {
186 xfer |= MVSD_XFER_MODE_PIO;
187 /* PIO section of mvsd_irq has comments on those bits */
188 if (data->flags & MMC_DATA_WRITE)
189 intr |= MVSD_NOR_TX_AVAIL;
190 else if (host->pio_size > 32)
191 intr |= MVSD_NOR_RX_FIFO_8W;
192 else
193 intr |= MVSD_NOR_RX_READY;
194 }
195
196 if (data->stop) {
197 struct mmc_command *stop = data->stop;
198 u32 cmd12reg = 0;
199
200 mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
201 mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
202
203 if (stop->flags & MMC_RSP_BUSY)
204 cmd12reg |= MVSD_AUTOCMD12_BUSY;
205 if (stop->flags & MMC_RSP_OPCODE)
206 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
207 cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
208 mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
209
210 xfer |= MVSD_XFER_MODE_AUTO_CMD12;
211 intr |= MVSD_NOR_AUTOCMD12_DONE;
212 } else {
213 intr |= MVSD_NOR_XFER_DONE;
214 }
215 } else {
216 intr |= MVSD_NOR_CMD_DONE;
217 }
218
219 mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
220 mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
221
222 spin_lock_irqsave(&host->lock, flags);
223
224 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
225 host->xfer_mode |= xfer;
226 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
227
228 mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
229 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
230 mvsd_write(MVSD_CMD, cmdreg);
231
232 host->intr_en &= MVSD_NOR_CARD_INT;
233 host->intr_en |= intr | MVSD_NOR_ERROR;
234 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
235 mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
236
237 mod_timer(&host->timer, jiffies + 5 * HZ);
238
239 spin_unlock_irqrestore(&host->lock, flags);
240 }
241
242 static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
243 u32 err_status)
244 {
245 void __iomem *iobase = host->base;
246
247 if (cmd->flags & MMC_RSP_136) {
248 unsigned int response[8], i;
249 for (i = 0; i < 8; i++)
250 response[i] = mvsd_read(MVSD_RSP(i));
251 cmd->resp[0] = ((response[0] & 0x03ff) << 22) |
252 ((response[1] & 0xffff) << 6) |
253 ((response[2] & 0xfc00) >> 10);
254 cmd->resp[1] = ((response[2] & 0x03ff) << 22) |
255 ((response[3] & 0xffff) << 6) |
256 ((response[4] & 0xfc00) >> 10);
257 cmd->resp[2] = ((response[4] & 0x03ff) << 22) |
258 ((response[5] & 0xffff) << 6) |
259 ((response[6] & 0xfc00) >> 10);
260 cmd->resp[3] = ((response[6] & 0x03ff) << 22) |
261 ((response[7] & 0x3fff) << 8);
262 } else if (cmd->flags & MMC_RSP_PRESENT) {
263 unsigned int response[3], i;
264 for (i = 0; i < 3; i++)
265 response[i] = mvsd_read(MVSD_RSP(i));
266 cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
267 ((response[1] & 0xffff) << (14 - 8)) |
268 ((response[0] & 0x03ff) << (30 - 8));
269 cmd->resp[1] = ((response[0] & 0xfc00) >> 10);
270 cmd->resp[2] = 0;
271 cmd->resp[3] = 0;
272 }
273
274 if (err_status & MVSD_ERR_CMD_TIMEOUT) {
275 cmd->error = -ETIMEDOUT;
276 } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
277 MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
278 cmd->error = -EILSEQ;
279 }
280 err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
281 MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
282 MVSD_ERR_CMD_STARTBIT);
283
284 return err_status;
285 }
286
287 static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
288 u32 err_status)
289 {
290 void __iomem *iobase = host->base;
291
292 if (host->pio_ptr) {
293 host->pio_ptr = NULL;
294 host->pio_size = 0;
295 } else {
296 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
297 (data->flags & MMC_DATA_READ) ?
298 DMA_FROM_DEVICE : DMA_TO_DEVICE);
299 }
300
301 if (err_status & MVSD_ERR_DATA_TIMEOUT)
302 data->error = -ETIMEDOUT;
303 else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
304 data->error = -EILSEQ;
305 else if (err_status & MVSD_ERR_XFER_SIZE)
306 data->error = -EBADE;
307 err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
308 MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
309
310 dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
311 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
312 data->bytes_xfered =
313 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
314 /* We can't be sure about the last block when errors are detected */
315 if (data->bytes_xfered && data->error)
316 data->bytes_xfered -= data->blksz;
317
318 /* Handle Auto cmd 12 response */
319 if (data->stop) {
320 unsigned int response[3], i;
321 for (i = 0; i < 3; i++)
322 response[i] = mvsd_read(MVSD_AUTO_RSP(i));
323 data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
324 ((response[1] & 0xffff) << (14 - 8)) |
325 ((response[0] & 0x03ff) << (30 - 8));
326 data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
327 data->stop->resp[2] = 0;
328 data->stop->resp[3] = 0;
329
330 if (err_status & MVSD_ERR_AUTOCMD12) {
331 u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
332 dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
333 if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
334 data->stop->error = -ENOEXEC;
335 else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
336 data->stop->error = -ETIMEDOUT;
337 else if (err_cmd12)
338 data->stop->error = -EILSEQ;
339 err_status &= ~MVSD_ERR_AUTOCMD12;
340 }
341 }
342
343 return err_status;
344 }
345
346 static irqreturn_t mvsd_irq(int irq, void *dev)
347 {
348 struct mvsd_host *host = dev;
349 void __iomem *iobase = host->base;
350 u32 intr_status, intr_done_mask;
351 int irq_handled = 0;
352
353 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
354 dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
355 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
356 mvsd_read(MVSD_HW_STATE));
357
358 /*
359 * It looks like, SDIO IP can issue one late, spurious irq
360 * although all irqs should be disabled. To work around this,
361 * bail out early, if we didn't expect any irqs to occur.
362 */
363 if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) {
364 dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n",
365 mvsd_read(MVSD_NOR_INTR_STATUS),
366 mvsd_read(MVSD_NOR_INTR_EN),
367 mvsd_read(MVSD_ERR_INTR_STATUS),
368 mvsd_read(MVSD_ERR_INTR_EN));
369 return IRQ_HANDLED;
370 }
371
372 spin_lock(&host->lock);
373
374 /* PIO handling, if needed. Messy business... */
375 if (host->pio_size &&
376 (intr_status & host->intr_en &
377 (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
378 u16 *p = host->pio_ptr;
379 int s = host->pio_size;
380 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
381 readsw(iobase + MVSD_FIFO, p, 16);
382 p += 16;
383 s -= 32;
384 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
385 }
386 /*
387 * Normally we'd use < 32 here, but the RX_FIFO_8W bit
388 * doesn't appear to assert when there is exactly 32 bytes
389 * (8 words) left to fetch in a transfer.
390 */
391 if (s <= 32) {
392 while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
393 put_unaligned(mvsd_read(MVSD_FIFO), p++);
394 put_unaligned(mvsd_read(MVSD_FIFO), p++);
395 s -= 4;
396 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
397 }
398 if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
399 u16 val[2] = {0, 0};
400 val[0] = mvsd_read(MVSD_FIFO);
401 val[1] = mvsd_read(MVSD_FIFO);
402 memcpy(p, ((void *)&val) + 4 - s, s);
403 s = 0;
404 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
405 }
406 if (s == 0) {
407 host->intr_en &=
408 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
409 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
410 } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
411 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
412 host->intr_en |= MVSD_NOR_RX_READY;
413 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
414 }
415 }
416 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
417 s, intr_status, mvsd_read(MVSD_HW_STATE));
418 host->pio_ptr = p;
419 host->pio_size = s;
420 irq_handled = 1;
421 } else if (host->pio_size &&
422 (intr_status & host->intr_en &
423 (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
424 u16 *p = host->pio_ptr;
425 int s = host->pio_size;
426 /*
427 * The TX_FIFO_8W bit is unreliable. When set, bursting
428 * 16 halfwords all at once in the FIFO drops data. Actually
429 * TX_AVAIL does go off after only one word is pushed even if
430 * TX_FIFO_8W remains set.
431 */
432 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
433 mvsd_write(MVSD_FIFO, get_unaligned(p++));
434 mvsd_write(MVSD_FIFO, get_unaligned(p++));
435 s -= 4;
436 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
437 }
438 if (s < 4) {
439 if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
440 u16 val[2] = {0, 0};
441 memcpy(((void *)&val) + 4 - s, p, s);
442 mvsd_write(MVSD_FIFO, val[0]);
443 mvsd_write(MVSD_FIFO, val[1]);
444 s = 0;
445 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
446 }
447 if (s == 0) {
448 host->intr_en &=
449 ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
450 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
451 }
452 }
453 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
454 s, intr_status, mvsd_read(MVSD_HW_STATE));
455 host->pio_ptr = p;
456 host->pio_size = s;
457 irq_handled = 1;
458 }
459
460 mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
461
462 intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
463 MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
464 if (intr_status & host->intr_en & ~intr_done_mask) {
465 struct mmc_request *mrq = host->mrq;
466 struct mmc_command *cmd = mrq->cmd;
467 u32 err_status = 0;
468
469 del_timer(&host->timer);
470 host->mrq = NULL;
471
472 host->intr_en &= MVSD_NOR_CARD_INT;
473 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
474 mvsd_write(MVSD_ERR_INTR_EN, 0);
475
476 spin_unlock(&host->lock);
477
478 if (intr_status & MVSD_NOR_UNEXP_RSP) {
479 cmd->error = -EPROTO;
480 } else if (intr_status & MVSD_NOR_ERROR) {
481 err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
482 dev_dbg(host->dev, "err 0x%04x\n", err_status);
483 }
484
485 err_status = mvsd_finish_cmd(host, cmd, err_status);
486 if (mrq->data)
487 err_status = mvsd_finish_data(host, mrq->data, err_status);
488 if (err_status) {
489 dev_err(host->dev, "unhandled error status %#04x\n",
490 err_status);
491 cmd->error = -ENOMSG;
492 }
493
494 mmc_request_done(host->mmc, mrq);
495 irq_handled = 1;
496 } else
497 spin_unlock(&host->lock);
498
499 if (intr_status & MVSD_NOR_CARD_INT) {
500 mmc_signal_sdio_irq(host->mmc);
501 irq_handled = 1;
502 }
503
504 if (irq_handled)
505 return IRQ_HANDLED;
506
507 dev_err(host->dev, "unhandled interrupt status=0x%04x en=0x%04x pio=%d\n",
508 intr_status, host->intr_en, host->pio_size);
509 return IRQ_NONE;
510 }
511
512 static void mvsd_timeout_timer(unsigned long data)
513 {
514 struct mvsd_host *host = (struct mvsd_host *)data;
515 void __iomem *iobase = host->base;
516 struct mmc_request *mrq;
517 unsigned long flags;
518
519 spin_lock_irqsave(&host->lock, flags);
520 mrq = host->mrq;
521 if (mrq) {
522 dev_err(host->dev, "Timeout waiting for hardware interrupt.\n");
523 dev_err(host->dev, "hw_state=0x%04x, intr_status=0x%04x intr_en=0x%04x\n",
524 mvsd_read(MVSD_HW_STATE),
525 mvsd_read(MVSD_NOR_INTR_STATUS),
526 mvsd_read(MVSD_NOR_INTR_EN));
527
528 host->mrq = NULL;
529
530 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
531
532 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
533 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
534
535 host->intr_en &= MVSD_NOR_CARD_INT;
536 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
537 mvsd_write(MVSD_ERR_INTR_EN, 0);
538 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
539
540 mrq->cmd->error = -ETIMEDOUT;
541 mvsd_finish_cmd(host, mrq->cmd, 0);
542 if (mrq->data) {
543 mrq->data->error = -ETIMEDOUT;
544 mvsd_finish_data(host, mrq->data, 0);
545 }
546 }
547 spin_unlock_irqrestore(&host->lock, flags);
548
549 if (mrq)
550 mmc_request_done(host->mmc, mrq);
551 }
552
553 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
554 {
555 struct mvsd_host *host = mmc_priv(mmc);
556 void __iomem *iobase = host->base;
557 unsigned long flags;
558
559 spin_lock_irqsave(&host->lock, flags);
560 if (enable) {
561 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
562 host->intr_en |= MVSD_NOR_CARD_INT;
563 } else {
564 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
565 host->intr_en &= ~MVSD_NOR_CARD_INT;
566 }
567 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
568 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
569 spin_unlock_irqrestore(&host->lock, flags);
570 }
571
572 static void mvsd_power_up(struct mvsd_host *host)
573 {
574 void __iomem *iobase = host->base;
575 dev_dbg(host->dev, "power up\n");
576 mvsd_write(MVSD_NOR_INTR_EN, 0);
577 mvsd_write(MVSD_ERR_INTR_EN, 0);
578 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
579 mvsd_write(MVSD_XFER_MODE, 0);
580 mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
581 mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
582 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
583 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
584 }
585
586 static void mvsd_power_down(struct mvsd_host *host)
587 {
588 void __iomem *iobase = host->base;
589 dev_dbg(host->dev, "power down\n");
590 mvsd_write(MVSD_NOR_INTR_EN, 0);
591 mvsd_write(MVSD_ERR_INTR_EN, 0);
592 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
593 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
594 mvsd_write(MVSD_NOR_STATUS_EN, 0);
595 mvsd_write(MVSD_ERR_STATUS_EN, 0);
596 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
597 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
598 }
599
600 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
601 {
602 struct mvsd_host *host = mmc_priv(mmc);
603 void __iomem *iobase = host->base;
604 u32 ctrl_reg = 0;
605
606 if (ios->power_mode == MMC_POWER_UP)
607 mvsd_power_up(host);
608
609 if (ios->clock == 0) {
610 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
611 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
612 host->clock = 0;
613 dev_dbg(host->dev, "clock off\n");
614 } else if (ios->clock != host->clock) {
615 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
616 if (m > MVSD_BASE_DIV_MAX)
617 m = MVSD_BASE_DIV_MAX;
618 mvsd_write(MVSD_CLK_DIV, m);
619 host->clock = ios->clock;
620 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
621 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
622 ios->clock, host->base_clock / (m+1), m);
623 }
624
625 /* default transfer mode */
626 ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
627 ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
628
629 /* default to maximum timeout */
630 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
631 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
632
633 if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
634 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
635
636 if (ios->bus_width == MMC_BUS_WIDTH_4)
637 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
638
639 /*
640 * The HI_SPEED_EN bit is causing trouble with many (but not all)
641 * high speed SD, SDHC and SDIO cards. Not enabling that bit
642 * makes all cards work. So let's just ignore that bit for now
643 * and revisit this issue if problems for not enabling this bit
644 * are ever reported.
645 */
646 #if 0
647 if (ios->timing == MMC_TIMING_MMC_HS ||
648 ios->timing == MMC_TIMING_SD_HS)
649 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
650 #endif
651
652 host->ctrl = ctrl_reg;
653 mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
654 dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
655 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
656 "push-pull" : "open-drain",
657 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
658 "4bit-width" : "1bit-width",
659 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
660 "high-speed" : "");
661
662 if (ios->power_mode == MMC_POWER_OFF)
663 mvsd_power_down(host);
664 }
665
666 static const struct mmc_host_ops mvsd_ops = {
667 .request = mvsd_request,
668 .get_ro = mmc_gpio_get_ro,
669 .set_ios = mvsd_set_ios,
670 .enable_sdio_irq = mvsd_enable_sdio_irq,
671 };
672
673 static void
674 mv_conf_mbus_windows(struct mvsd_host *host,
675 const struct mbus_dram_target_info *dram)
676 {
677 void __iomem *iobase = host->base;
678 int i;
679
680 for (i = 0; i < 4; i++) {
681 writel(0, iobase + MVSD_WINDOW_CTRL(i));
682 writel(0, iobase + MVSD_WINDOW_BASE(i));
683 }
684
685 for (i = 0; i < dram->num_cs; i++) {
686 const struct mbus_dram_window *cs = dram->cs + i;
687 writel(((cs->size - 1) & 0xffff0000) |
688 (cs->mbus_attr << 8) |
689 (dram->mbus_dram_target_id << 4) | 1,
690 iobase + MVSD_WINDOW_CTRL(i));
691 writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
692 }
693 }
694
695 static int mvsd_probe(struct platform_device *pdev)
696 {
697 struct device_node *np = pdev->dev.of_node;
698 struct mmc_host *mmc = NULL;
699 struct mvsd_host *host = NULL;
700 const struct mbus_dram_target_info *dram;
701 struct resource *r;
702 int ret, irq;
703
704 if (!np) {
705 dev_err(&pdev->dev, "no DT node\n");
706 return -ENODEV;
707 }
708 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
709 irq = platform_get_irq(pdev, 0);
710 if (!r || irq < 0)
711 return -ENXIO;
712
713 mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
714 if (!mmc) {
715 ret = -ENOMEM;
716 goto out;
717 }
718
719 host = mmc_priv(mmc);
720 host->mmc = mmc;
721 host->dev = &pdev->dev;
722
723 /*
724 * Some non-DT platforms do not pass a clock, and the clock
725 * frequency is passed through platform_data. On DT platforms,
726 * a clock must always be passed, even if there is no gatable
727 * clock associated to the SDIO interface (it can simply be a
728 * fixed rate clock).
729 */
730 host->clk = devm_clk_get(&pdev->dev, NULL);
731 if (IS_ERR(host->clk)) {
732 dev_err(&pdev->dev, "no clock associated\n");
733 ret = -EINVAL;
734 goto out;
735 }
736 clk_prepare_enable(host->clk);
737
738 mmc->ops = &mvsd_ops;
739
740 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
741
742 mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
743 mmc->f_max = MVSD_CLOCKRATE_MAX;
744
745 mmc->max_blk_size = 2048;
746 mmc->max_blk_count = 65535;
747
748 mmc->max_segs = 1;
749 mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
750 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
751
752 host->base_clock = clk_get_rate(host->clk) / 2;
753 ret = mmc_of_parse(mmc);
754 if (ret < 0)
755 goto out;
756 if (maxfreq)
757 mmc->f_max = maxfreq;
758
759 spin_lock_init(&host->lock);
760
761 host->base = devm_ioremap_resource(&pdev->dev, r);
762 if (IS_ERR(host->base)) {
763 ret = PTR_ERR(host->base);
764 goto out;
765 }
766
767 /* (Re-)program MBUS remapping windows if we are asked to. */
768 dram = mv_mbus_dram_info();
769 if (dram)
770 mv_conf_mbus_windows(host, dram);
771
772 mvsd_power_down(host);
773
774 ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host);
775 if (ret) {
776 dev_err(&pdev->dev, "cannot assign irq %d\n", irq);
777 goto out;
778 }
779
780 setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host);
781 platform_set_drvdata(pdev, mmc);
782 ret = mmc_add_host(mmc);
783 if (ret)
784 goto out;
785
786 if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
787 dev_dbg(&pdev->dev, "using GPIO for card detection\n");
788 else
789 dev_dbg(&pdev->dev, "lacking card detect (fall back to polling)\n");
790
791 return 0;
792
793 out:
794 if (mmc) {
795 if (!IS_ERR(host->clk))
796 clk_disable_unprepare(host->clk);
797 mmc_free_host(mmc);
798 }
799
800 return ret;
801 }
802
803 static int mvsd_remove(struct platform_device *pdev)
804 {
805 struct mmc_host *mmc = platform_get_drvdata(pdev);
806
807 struct mvsd_host *host = mmc_priv(mmc);
808
809 mmc_remove_host(mmc);
810 del_timer_sync(&host->timer);
811 mvsd_power_down(host);
812
813 if (!IS_ERR(host->clk))
814 clk_disable_unprepare(host->clk);
815 mmc_free_host(mmc);
816
817 return 0;
818 }
819
820 static const struct of_device_id mvsdio_dt_ids[] = {
821 { .compatible = "marvell,orion-sdio" },
822 { /* sentinel */ }
823 };
824 MODULE_DEVICE_TABLE(of, mvsdio_dt_ids);
825
826 static struct platform_driver mvsd_driver = {
827 .probe = mvsd_probe,
828 .remove = mvsd_remove,
829 .driver = {
830 .name = DRIVER_NAME,
831 .of_match_table = mvsdio_dt_ids,
832 },
833 };
834
835 module_platform_driver(mvsd_driver);
836
837 /* maximum card clock frequency (default 50MHz) */
838 module_param(maxfreq, int, 0);
839
840 /* force PIO transfers all the time */
841 module_param(nodma, int, 0);
842
843 MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
844 MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
845 MODULE_LICENSE("GPL");
846 MODULE_ALIAS("platform:mvsdio");
Linux kernel - Deliverables
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