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Merge tag 'v4.0-rc1' into locking/core, to refresh the tree before merging new changes
[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/gpio.h>
24 #include <linux/of_gpio.h>
25 #include <linux/of_irq.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/slot-gpio.h>
28
29 #include <asm/sizes.h>
30 #include <asm/unaligned.h>
31 #include <linux/platform_data/mmc-mvsdio.h>
32
33 #include "mvsdio.h"
34
35 #define DRIVER_NAME "mvsdio"
36
37 static int maxfreq;
38 static int nodma;
39
40 struct mvsd_host {
41 void __iomem *base;
42 struct mmc_request *mrq;
43 spinlock_t lock;
44 unsigned int xfer_mode;
45 unsigned int intr_en;
46 unsigned int ctrl;
47 unsigned int pio_size;
48 void *pio_ptr;
49 unsigned int sg_frags;
50 unsigned int ns_per_clk;
51 unsigned int clock;
52 unsigned int base_clock;
53 struct timer_list timer;
54 struct mmc_host *mmc;
55 struct device *dev;
56 struct clk *clk;
57 };
58
59 #define mvsd_write(offs, val) writel(val, iobase + (offs))
60 #define mvsd_read(offs) readl(iobase + (offs))
61
62 static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
63 {
64 void __iomem *iobase = host->base;
65 unsigned int tmout;
66 int tmout_index;
67
68 /*
69 * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE
70 * register is sometimes not set before a while when some
71 * "unusual" data block sizes are used (such as with the SWITCH
72 * command), even despite the fact that the XFER_DONE interrupt
73 * was raised. And if another data transfer starts before
74 * this bit comes to good sense (which eventually happens by
75 * itself) then the new transfer simply fails with a timeout.
76 */
77 if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) {
78 unsigned long t = jiffies + HZ;
79 unsigned int hw_state, count = 0;
80 do {
81 hw_state = mvsd_read(MVSD_HW_STATE);
82 if (time_after(jiffies, t)) {
83 dev_warn(host->dev, "FIFO_EMPTY bit missing\n");
84 break;
85 }
86 count++;
87 } while (!(hw_state & (1 << 13)));
88 dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit "
89 "(hw=0x%04x, count=%d, jiffies=%ld)\n",
90 hw_state, count, jiffies - (t - HZ));
91 }
92
93 /* If timeout=0 then maximum timeout index is used. */
94 tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
95 tmout += data->timeout_clks;
96 tmout_index = fls(tmout - 1) - 12;
97 if (tmout_index < 0)
98 tmout_index = 0;
99 if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
100 tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
101
102 dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
103 (data->flags & MMC_DATA_READ) ? "read" : "write",
104 (u32)sg_virt(data->sg), data->blocks, data->blksz,
105 tmout, tmout_index);
106
107 host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
108 host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
109 mvsd_write(MVSD_HOST_CTRL, host->ctrl);
110 mvsd_write(MVSD_BLK_COUNT, data->blocks);
111 mvsd_write(MVSD_BLK_SIZE, data->blksz);
112
113 if (nodma || (data->blksz | data->sg->offset) & 3 ||
114 ((!(data->flags & MMC_DATA_READ) && data->sg->offset & 0x3f))) {
115 /*
116 * We cannot do DMA on a buffer which offset or size
117 * is not aligned on a 4-byte boundary.
118 *
119 * It also appears the host to card DMA can corrupt
120 * data when the buffer is not aligned on a 64 byte
121 * boundary.
122 */
123 host->pio_size = data->blocks * data->blksz;
124 host->pio_ptr = sg_virt(data->sg);
125 if (!nodma)
126 dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n",
127 host->pio_ptr, host->pio_size);
128 return 1;
129 } else {
130 dma_addr_t phys_addr;
131 int dma_dir = (data->flags & MMC_DATA_READ) ?
132 DMA_FROM_DEVICE : DMA_TO_DEVICE;
133 host->sg_frags = dma_map_sg(mmc_dev(host->mmc), data->sg,
134 data->sg_len, dma_dir);
135 phys_addr = sg_dma_address(data->sg);
136 mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
137 mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
138 return 0;
139 }
140 }
141
142 static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
143 {
144 struct mvsd_host *host = mmc_priv(mmc);
145 void __iomem *iobase = host->base;
146 struct mmc_command *cmd = mrq->cmd;
147 u32 cmdreg = 0, xfer = 0, intr = 0;
148 unsigned long flags;
149
150 BUG_ON(host->mrq != NULL);
151 host->mrq = mrq;
152
153 dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
154 cmd->opcode, mvsd_read(MVSD_HW_STATE));
155
156 cmdreg = MVSD_CMD_INDEX(cmd->opcode);
157
158 if (cmd->flags & MMC_RSP_BUSY)
159 cmdreg |= MVSD_CMD_RSP_48BUSY;
160 else if (cmd->flags & MMC_RSP_136)
161 cmdreg |= MVSD_CMD_RSP_136;
162 else if (cmd->flags & MMC_RSP_PRESENT)
163 cmdreg |= MVSD_CMD_RSP_48;
164 else
165 cmdreg |= MVSD_CMD_RSP_NONE;
166
167 if (cmd->flags & MMC_RSP_CRC)
168 cmdreg |= MVSD_CMD_CHECK_CMDCRC;
169
170 if (cmd->flags & MMC_RSP_OPCODE)
171 cmdreg |= MVSD_CMD_INDX_CHECK;
172
173 if (cmd->flags & MMC_RSP_PRESENT) {
174 cmdreg |= MVSD_UNEXPECTED_RESP;
175 intr |= MVSD_NOR_UNEXP_RSP;
176 }
177
178 if (mrq->data) {
179 struct mmc_data *data = mrq->data;
180 int pio;
181
182 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
183 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
184 if (data->flags & MMC_DATA_READ)
185 xfer |= MVSD_XFER_MODE_TO_HOST;
186
187 pio = mvsd_setup_data(host, data);
188 if (pio) {
189 xfer |= MVSD_XFER_MODE_PIO;
190 /* PIO section of mvsd_irq has comments on those bits */
191 if (data->flags & MMC_DATA_WRITE)
192 intr |= MVSD_NOR_TX_AVAIL;
193 else if (host->pio_size > 32)
194 intr |= MVSD_NOR_RX_FIFO_8W;
195 else
196 intr |= MVSD_NOR_RX_READY;
197 }
198
199 if (data->stop) {
200 struct mmc_command *stop = data->stop;
201 u32 cmd12reg = 0;
202
203 mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
204 mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
205
206 if (stop->flags & MMC_RSP_BUSY)
207 cmd12reg |= MVSD_AUTOCMD12_BUSY;
208 if (stop->flags & MMC_RSP_OPCODE)
209 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
210 cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
211 mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
212
213 xfer |= MVSD_XFER_MODE_AUTO_CMD12;
214 intr |= MVSD_NOR_AUTOCMD12_DONE;
215 } else {
216 intr |= MVSD_NOR_XFER_DONE;
217 }
218 } else {
219 intr |= MVSD_NOR_CMD_DONE;
220 }
221
222 mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
223 mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
224
225 spin_lock_irqsave(&host->lock, flags);
226
227 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
228 host->xfer_mode |= xfer;
229 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
230
231 mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
232 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
233 mvsd_write(MVSD_CMD, cmdreg);
234
235 host->intr_en &= MVSD_NOR_CARD_INT;
236 host->intr_en |= intr | MVSD_NOR_ERROR;
237 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
238 mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
239
240 mod_timer(&host->timer, jiffies + 5 * HZ);
241
242 spin_unlock_irqrestore(&host->lock, flags);
243 }
244
245 static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
246 u32 err_status)
247 {
248 void __iomem *iobase = host->base;
249
250 if (cmd->flags & MMC_RSP_136) {
251 unsigned int response[8], i;
252 for (i = 0; i < 8; i++)
253 response[i] = mvsd_read(MVSD_RSP(i));
254 cmd->resp[0] = ((response[0] & 0x03ff) << 22) |
255 ((response[1] & 0xffff) << 6) |
256 ((response[2] & 0xfc00) >> 10);
257 cmd->resp[1] = ((response[2] & 0x03ff) << 22) |
258 ((response[3] & 0xffff) << 6) |
259 ((response[4] & 0xfc00) >> 10);
260 cmd->resp[2] = ((response[4] & 0x03ff) << 22) |
261 ((response[5] & 0xffff) << 6) |
262 ((response[6] & 0xfc00) >> 10);
263 cmd->resp[3] = ((response[6] & 0x03ff) << 22) |
264 ((response[7] & 0x3fff) << 8);
265 } else if (cmd->flags & MMC_RSP_PRESENT) {
266 unsigned int response[3], i;
267 for (i = 0; i < 3; i++)
268 response[i] = mvsd_read(MVSD_RSP(i));
269 cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
270 ((response[1] & 0xffff) << (14 - 8)) |
271 ((response[0] & 0x03ff) << (30 - 8));
272 cmd->resp[1] = ((response[0] & 0xfc00) >> 10);
273 cmd->resp[2] = 0;
274 cmd->resp[3] = 0;
275 }
276
277 if (err_status & MVSD_ERR_CMD_TIMEOUT) {
278 cmd->error = -ETIMEDOUT;
279 } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
280 MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
281 cmd->error = -EILSEQ;
282 }
283 err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
284 MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
285 MVSD_ERR_CMD_STARTBIT);
286
287 return err_status;
288 }
289
290 static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
291 u32 err_status)
292 {
293 void __iomem *iobase = host->base;
294
295 if (host->pio_ptr) {
296 host->pio_ptr = NULL;
297 host->pio_size = 0;
298 } else {
299 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
300 (data->flags & MMC_DATA_READ) ?
301 DMA_FROM_DEVICE : DMA_TO_DEVICE);
302 }
303
304 if (err_status & MVSD_ERR_DATA_TIMEOUT)
305 data->error = -ETIMEDOUT;
306 else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
307 data->error = -EILSEQ;
308 else if (err_status & MVSD_ERR_XFER_SIZE)
309 data->error = -EBADE;
310 err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
311 MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
312
313 dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
314 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
315 data->bytes_xfered =
316 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
317 /* We can't be sure about the last block when errors are detected */
318 if (data->bytes_xfered && data->error)
319 data->bytes_xfered -= data->blksz;
320
321 /* Handle Auto cmd 12 response */
322 if (data->stop) {
323 unsigned int response[3], i;
324 for (i = 0; i < 3; i++)
325 response[i] = mvsd_read(MVSD_AUTO_RSP(i));
326 data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
327 ((response[1] & 0xffff) << (14 - 8)) |
328 ((response[0] & 0x03ff) << (30 - 8));
329 data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
330 data->stop->resp[2] = 0;
331 data->stop->resp[3] = 0;
332
333 if (err_status & MVSD_ERR_AUTOCMD12) {
334 u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
335 dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
336 if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
337 data->stop->error = -ENOEXEC;
338 else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
339 data->stop->error = -ETIMEDOUT;
340 else if (err_cmd12)
341 data->stop->error = -EILSEQ;
342 err_status &= ~MVSD_ERR_AUTOCMD12;
343 }
344 }
345
346 return err_status;
347 }
348
349 static irqreturn_t mvsd_irq(int irq, void *dev)
350 {
351 struct mvsd_host *host = dev;
352 void __iomem *iobase = host->base;
353 u32 intr_status, intr_done_mask;
354 int irq_handled = 0;
355
356 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
357 dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
358 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
359 mvsd_read(MVSD_HW_STATE));
360
361 /*
362 * It looks like, SDIO IP can issue one late, spurious irq
363 * although all irqs should be disabled. To work around this,
364 * bail out early, if we didn't expect any irqs to occur.
365 */
366 if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) {
367 dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n",
368 mvsd_read(MVSD_NOR_INTR_STATUS),
369 mvsd_read(MVSD_NOR_INTR_EN),
370 mvsd_read(MVSD_ERR_INTR_STATUS),
371 mvsd_read(MVSD_ERR_INTR_EN));
372 return IRQ_HANDLED;
373 }
374
375 spin_lock(&host->lock);
376
377 /* PIO handling, if needed. Messy business... */
378 if (host->pio_size &&
379 (intr_status & host->intr_en &
380 (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
381 u16 *p = host->pio_ptr;
382 int s = host->pio_size;
383 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
384 readsw(iobase + MVSD_FIFO, p, 16);
385 p += 16;
386 s -= 32;
387 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
388 }
389 /*
390 * Normally we'd use < 32 here, but the RX_FIFO_8W bit
391 * doesn't appear to assert when there is exactly 32 bytes
392 * (8 words) left to fetch in a transfer.
393 */
394 if (s <= 32) {
395 while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
396 put_unaligned(mvsd_read(MVSD_FIFO), p++);
397 put_unaligned(mvsd_read(MVSD_FIFO), p++);
398 s -= 4;
399 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
400 }
401 if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
402 u16 val[2] = {0, 0};
403 val[0] = mvsd_read(MVSD_FIFO);
404 val[1] = mvsd_read(MVSD_FIFO);
405 memcpy(p, ((void *)&val) + 4 - s, s);
406 s = 0;
407 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
408 }
409 if (s == 0) {
410 host->intr_en &=
411 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
412 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
413 } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
414 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
415 host->intr_en |= MVSD_NOR_RX_READY;
416 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
417 }
418 }
419 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
420 s, intr_status, mvsd_read(MVSD_HW_STATE));
421 host->pio_ptr = p;
422 host->pio_size = s;
423 irq_handled = 1;
424 } else if (host->pio_size &&
425 (intr_status & host->intr_en &
426 (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
427 u16 *p = host->pio_ptr;
428 int s = host->pio_size;
429 /*
430 * The TX_FIFO_8W bit is unreliable. When set, bursting
431 * 16 halfwords all at once in the FIFO drops data. Actually
432 * TX_AVAIL does go off after only one word is pushed even if
433 * TX_FIFO_8W remains set.
434 */
435 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
436 mvsd_write(MVSD_FIFO, get_unaligned(p++));
437 mvsd_write(MVSD_FIFO, get_unaligned(p++));
438 s -= 4;
439 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
440 }
441 if (s < 4) {
442 if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
443 u16 val[2] = {0, 0};
444 memcpy(((void *)&val) + 4 - s, p, s);
445 mvsd_write(MVSD_FIFO, val[0]);
446 mvsd_write(MVSD_FIFO, val[1]);
447 s = 0;
448 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
449 }
450 if (s == 0) {
451 host->intr_en &=
452 ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
453 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
454 }
455 }
456 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
457 s, intr_status, mvsd_read(MVSD_HW_STATE));
458 host->pio_ptr = p;
459 host->pio_size = s;
460 irq_handled = 1;
461 }
462
463 mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
464
465 intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
466 MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
467 if (intr_status & host->intr_en & ~intr_done_mask) {
468 struct mmc_request *mrq = host->mrq;
469 struct mmc_command *cmd = mrq->cmd;
470 u32 err_status = 0;
471
472 del_timer(&host->timer);
473 host->mrq = NULL;
474
475 host->intr_en &= MVSD_NOR_CARD_INT;
476 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
477 mvsd_write(MVSD_ERR_INTR_EN, 0);
478
479 spin_unlock(&host->lock);
480
481 if (intr_status & MVSD_NOR_UNEXP_RSP) {
482 cmd->error = -EPROTO;
483 } else if (intr_status & MVSD_NOR_ERROR) {
484 err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
485 dev_dbg(host->dev, "err 0x%04x\n", err_status);
486 }
487
488 err_status = mvsd_finish_cmd(host, cmd, err_status);
489 if (mrq->data)
490 err_status = mvsd_finish_data(host, mrq->data, err_status);
491 if (err_status) {
492 dev_err(host->dev, "unhandled error status %#04x\n",
493 err_status);
494 cmd->error = -ENOMSG;
495 }
496
497 mmc_request_done(host->mmc, mrq);
498 irq_handled = 1;
499 } else
500 spin_unlock(&host->lock);
501
502 if (intr_status & MVSD_NOR_CARD_INT) {
503 mmc_signal_sdio_irq(host->mmc);
504 irq_handled = 1;
505 }
506
507 if (irq_handled)
508 return IRQ_HANDLED;
509
510 dev_err(host->dev, "unhandled interrupt status=0x%04x en=0x%04x pio=%d\n",
511 intr_status, host->intr_en, host->pio_size);
512 return IRQ_NONE;
513 }
514
515 static void mvsd_timeout_timer(unsigned long data)
516 {
517 struct mvsd_host *host = (struct mvsd_host *)data;
518 void __iomem *iobase = host->base;
519 struct mmc_request *mrq;
520 unsigned long flags;
521
522 spin_lock_irqsave(&host->lock, flags);
523 mrq = host->mrq;
524 if (mrq) {
525 dev_err(host->dev, "Timeout waiting for hardware interrupt.\n");
526 dev_err(host->dev, "hw_state=0x%04x, intr_status=0x%04x intr_en=0x%04x\n",
527 mvsd_read(MVSD_HW_STATE),
528 mvsd_read(MVSD_NOR_INTR_STATUS),
529 mvsd_read(MVSD_NOR_INTR_EN));
530
531 host->mrq = NULL;
532
533 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
534
535 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
536 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
537
538 host->intr_en &= MVSD_NOR_CARD_INT;
539 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
540 mvsd_write(MVSD_ERR_INTR_EN, 0);
541 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
542
543 mrq->cmd->error = -ETIMEDOUT;
544 mvsd_finish_cmd(host, mrq->cmd, 0);
545 if (mrq->data) {
546 mrq->data->error = -ETIMEDOUT;
547 mvsd_finish_data(host, mrq->data, 0);
548 }
549 }
550 spin_unlock_irqrestore(&host->lock, flags);
551
552 if (mrq)
553 mmc_request_done(host->mmc, mrq);
554 }
555
556 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
557 {
558 struct mvsd_host *host = mmc_priv(mmc);
559 void __iomem *iobase = host->base;
560 unsigned long flags;
561
562 spin_lock_irqsave(&host->lock, flags);
563 if (enable) {
564 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
565 host->intr_en |= MVSD_NOR_CARD_INT;
566 } else {
567 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
568 host->intr_en &= ~MVSD_NOR_CARD_INT;
569 }
570 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
571 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
572 spin_unlock_irqrestore(&host->lock, flags);
573 }
574
575 static void mvsd_power_up(struct mvsd_host *host)
576 {
577 void __iomem *iobase = host->base;
578 dev_dbg(host->dev, "power up\n");
579 mvsd_write(MVSD_NOR_INTR_EN, 0);
580 mvsd_write(MVSD_ERR_INTR_EN, 0);
581 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
582 mvsd_write(MVSD_XFER_MODE, 0);
583 mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
584 mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
585 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
586 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
587 }
588
589 static void mvsd_power_down(struct mvsd_host *host)
590 {
591 void __iomem *iobase = host->base;
592 dev_dbg(host->dev, "power down\n");
593 mvsd_write(MVSD_NOR_INTR_EN, 0);
594 mvsd_write(MVSD_ERR_INTR_EN, 0);
595 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
596 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
597 mvsd_write(MVSD_NOR_STATUS_EN, 0);
598 mvsd_write(MVSD_ERR_STATUS_EN, 0);
599 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
600 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
601 }
602
603 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
604 {
605 struct mvsd_host *host = mmc_priv(mmc);
606 void __iomem *iobase = host->base;
607 u32 ctrl_reg = 0;
608
609 if (ios->power_mode == MMC_POWER_UP)
610 mvsd_power_up(host);
611
612 if (ios->clock == 0) {
613 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
614 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
615 host->clock = 0;
616 dev_dbg(host->dev, "clock off\n");
617 } else if (ios->clock != host->clock) {
618 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
619 if (m > MVSD_BASE_DIV_MAX)
620 m = MVSD_BASE_DIV_MAX;
621 mvsd_write(MVSD_CLK_DIV, m);
622 host->clock = ios->clock;
623 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
624 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
625 ios->clock, host->base_clock / (m+1), m);
626 }
627
628 /* default transfer mode */
629 ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
630 ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
631
632 /* default to maximum timeout */
633 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
634 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
635
636 if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
637 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
638
639 if (ios->bus_width == MMC_BUS_WIDTH_4)
640 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
641
642 /*
643 * The HI_SPEED_EN bit is causing trouble with many (but not all)
644 * high speed SD, SDHC and SDIO cards. Not enabling that bit
645 * makes all cards work. So let's just ignore that bit for now
646 * and revisit this issue if problems for not enabling this bit
647 * are ever reported.
648 */
649 #if 0
650 if (ios->timing == MMC_TIMING_MMC_HS ||
651 ios->timing == MMC_TIMING_SD_HS)
652 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
653 #endif
654
655 host->ctrl = ctrl_reg;
656 mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
657 dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
658 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
659 "push-pull" : "open-drain",
660 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
661 "4bit-width" : "1bit-width",
662 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
663 "high-speed" : "");
664
665 if (ios->power_mode == MMC_POWER_OFF)
666 mvsd_power_down(host);
667 }
668
669 static const struct mmc_host_ops mvsd_ops = {
670 .request = mvsd_request,
671 .get_ro = mmc_gpio_get_ro,
672 .set_ios = mvsd_set_ios,
673 .enable_sdio_irq = mvsd_enable_sdio_irq,
674 };
675
676 static void
677 mv_conf_mbus_windows(struct mvsd_host *host,
678 const struct mbus_dram_target_info *dram)
679 {
680 void __iomem *iobase = host->base;
681 int i;
682
683 for (i = 0; i < 4; i++) {
684 writel(0, iobase + MVSD_WINDOW_CTRL(i));
685 writel(0, iobase + MVSD_WINDOW_BASE(i));
686 }
687
688 for (i = 0; i < dram->num_cs; i++) {
689 const struct mbus_dram_window *cs = dram->cs + i;
690 writel(((cs->size - 1) & 0xffff0000) |
691 (cs->mbus_attr << 8) |
692 (dram->mbus_dram_target_id << 4) | 1,
693 iobase + MVSD_WINDOW_CTRL(i));
694 writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
695 }
696 }
697
698 static int mvsd_probe(struct platform_device *pdev)
699 {
700 struct device_node *np = pdev->dev.of_node;
701 struct mmc_host *mmc = NULL;
702 struct mvsd_host *host = NULL;
703 const struct mbus_dram_target_info *dram;
704 struct resource *r;
705 int ret, irq;
706
707 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
708 irq = platform_get_irq(pdev, 0);
709 if (!r || irq < 0)
710 return -ENXIO;
711
712 mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
713 if (!mmc) {
714 ret = -ENOMEM;
715 goto out;
716 }
717
718 host = mmc_priv(mmc);
719 host->mmc = mmc;
720 host->dev = &pdev->dev;
721
722 /*
723 * Some non-DT platforms do not pass a clock, and the clock
724 * frequency is passed through platform_data. On DT platforms,
725 * a clock must always be passed, even if there is no gatable
726 * clock associated to the SDIO interface (it can simply be a
727 * fixed rate clock).
728 */
729 host->clk = devm_clk_get(&pdev->dev, NULL);
730 if (!IS_ERR(host->clk))
731 clk_prepare_enable(host->clk);
732
733 mmc->ops = &mvsd_ops;
734
735 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
736
737 mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
738 mmc->f_max = MVSD_CLOCKRATE_MAX;
739
740 mmc->max_blk_size = 2048;
741 mmc->max_blk_count = 65535;
742
743 mmc->max_segs = 1;
744 mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
745 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
746
747 if (np) {
748 if (IS_ERR(host->clk)) {
749 dev_err(&pdev->dev, "DT platforms must have a clock associated\n");
750 ret = -EINVAL;
751 goto out;
752 }
753
754 host->base_clock = clk_get_rate(host->clk) / 2;
755 ret = mmc_of_parse(mmc);
756 if (ret < 0)
757 goto out;
758 } else {
759 const struct mvsdio_platform_data *mvsd_data;
760
761 mvsd_data = pdev->dev.platform_data;
762 if (!mvsd_data) {
763 ret = -ENXIO;
764 goto out;
765 }
766 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ |
767 MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
768 host->base_clock = mvsd_data->clock / 2;
769 /* GPIO 0 regarded as invalid for backward compatibility */
770 if (mvsd_data->gpio_card_detect &&
771 gpio_is_valid(mvsd_data->gpio_card_detect)) {
772 ret = mmc_gpio_request_cd(mmc,
773 mvsd_data->gpio_card_detect,
774 0);
775 if (ret)
776 goto out;
777 } else {
778 mmc->caps |= MMC_CAP_NEEDS_POLL;
779 }
780
781 if (mvsd_data->gpio_write_protect &&
782 gpio_is_valid(mvsd_data->gpio_write_protect))
783 mmc_gpio_request_ro(mmc, mvsd_data->gpio_write_protect);
784 }
785
786 if (maxfreq)
787 mmc->f_max = maxfreq;
788
789 spin_lock_init(&host->lock);
790
791 host->base = devm_ioremap_resource(&pdev->dev, r);
792 if (IS_ERR(host->base)) {
793 ret = PTR_ERR(host->base);
794 goto out;
795 }
796
797 /* (Re-)program MBUS remapping windows if we are asked to. */
798 dram = mv_mbus_dram_info();
799 if (dram)
800 mv_conf_mbus_windows(host, dram);
801
802 mvsd_power_down(host);
803
804 ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host);
805 if (ret) {
806 dev_err(&pdev->dev, "cannot assign irq %d\n", irq);
807 goto out;
808 }
809
810 setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host);
811 platform_set_drvdata(pdev, mmc);
812 ret = mmc_add_host(mmc);
813 if (ret)
814 goto out;
815
816 if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
817 dev_dbg(&pdev->dev, "using GPIO for card detection\n");
818 else
819 dev_dbg(&pdev->dev, "lacking card detect (fall back to polling)\n");
820
821 return 0;
822
823 out:
824 if (mmc) {
825 if (!IS_ERR(host->clk))
826 clk_disable_unprepare(host->clk);
827 mmc_free_host(mmc);
828 }
829
830 return ret;
831 }
832
833 static int mvsd_remove(struct platform_device *pdev)
834 {
835 struct mmc_host *mmc = platform_get_drvdata(pdev);
836
837 struct mvsd_host *host = mmc_priv(mmc);
838
839 mmc_remove_host(mmc);
840 del_timer_sync(&host->timer);
841 mvsd_power_down(host);
842
843 if (!IS_ERR(host->clk))
844 clk_disable_unprepare(host->clk);
845 mmc_free_host(mmc);
846
847 return 0;
848 }
849
850 static const struct of_device_id mvsdio_dt_ids[] = {
851 { .compatible = "marvell,orion-sdio" },
852 { /* sentinel */ }
853 };
854 MODULE_DEVICE_TABLE(of, mvsdio_dt_ids);
855
856 static struct platform_driver mvsd_driver = {
857 .probe = mvsd_probe,
858 .remove = mvsd_remove,
859 .driver = {
860 .name = DRIVER_NAME,
861 .of_match_table = mvsdio_dt_ids,
862 },
863 };
864
865 module_platform_driver(mvsd_driver);
866
867 /* maximum card clock frequency (default 50MHz) */
868 module_param(maxfreq, int, 0);
869
870 /* force PIO transfers all the time */
871 module_param(nodma, int, 0);
872
873 MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
874 MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
875 MODULE_LICENSE("GPL");
876 MODULE_ALIAS("platform:mvsdio");
Linux kernel - Deliverables
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