1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Marvell MMC/SD/SDIO driver
4 *
5 * Authors: Maen Suleiman, Nicolas Pitre
6 * Copyright (C) 2008-2009 Marvell Ltd.
7 */
8
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/platform_device.h>
13 #include <linux/mbus.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/scatterlist.h>
18 #include <linux/irq.h>
19 #include <linux/clk.h>
20 #include <linux/of_irq.h>
21 #include <linux/mmc/host.h>
22 #include <linux/mmc/slot-gpio.h>
23
24 #include <linux/sizes.h>
25 #include <asm/unaligned.h>
26
27 #include "mvsdio.h"
28
29 #define DRIVER_NAME "mvsdio"
30
31 static int maxfreq;
32 static int nodma;
33
34 struct mvsd_host {
35 void __iomem *base;
36 struct mmc_request *mrq;
37 spinlock_t lock;
38 unsigned int xfer_mode;
39 unsigned int intr_en;
40 unsigned int ctrl;
41 bool use_pio;
42 struct sg_mapping_iter sg_miter;
43 unsigned int pio_size;
44 unsigned int sg_frags;
45 unsigned int ns_per_clk;
46 unsigned int clock;
47 unsigned int base_clock;
48 struct timer_list timer;
49 struct mmc_host *mmc;
50 struct device *dev;
51 struct clk *clk;
52 };
53
54 #define mvsd_write(offs, val) writel(val, iobase + (offs))
55 #define mvsd_read(offs) readl(iobase + (offs))
56
mvsd_setup_data(struct mvsd_host * host,struct mmc_data * data)57 static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
58 {
59 void __iomem *iobase = host->base;
60 unsigned int tmout;
61 int tmout_index;
62
63 /*
64 * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE
65 * register is sometimes not set before a while when some
66 * "unusual" data block sizes are used (such as with the SWITCH
67 * command), even despite the fact that the XFER_DONE interrupt
68 * was raised. And if another data transfer starts before
69 * this bit comes to good sense (which eventually happens by
70 * itself) then the new transfer simply fails with a timeout.
71 */
72 if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) {
73 unsigned long t = jiffies + HZ;
74 unsigned int hw_state, count = 0;
75 do {
76 hw_state = mvsd_read(MVSD_HW_STATE);
77 if (time_after(jiffies, t)) {
78 dev_warn(host->dev, "FIFO_EMPTY bit missing\n");
79 break;
80 }
81 count++;
82 } while (!(hw_state & (1 << 13)));
83 dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit "
84 "(hw=0x%04x, count=%d, jiffies=%ld)\n",
85 hw_state, count, jiffies - (t - HZ));
86 }
87
88 /* If timeout=0 then maximum timeout index is used. */
89 tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
90 tmout += data->timeout_clks;
91 tmout_index = fls(tmout - 1) - 12;
92 if (tmout_index < 0)
93 tmout_index = 0;
94 if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
95 tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
96
97 dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
98 (data->flags & MMC_DATA_READ) ? "read" : "write",
99 (u32)sg_virt(data->sg), data->blocks, data->blksz,
100 tmout, tmout_index);
101
102 host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
103 host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
104 mvsd_write(MVSD_HOST_CTRL, host->ctrl);
105 mvsd_write(MVSD_BLK_COUNT, data->blocks);
106 mvsd_write(MVSD_BLK_SIZE, data->blksz);
107
108 if (nodma || (data->blksz | data->sg->offset) & 3 ||
109 ((!(data->flags & MMC_DATA_READ) && data->sg->offset & 0x3f))) {
110 /*
111 * We cannot do DMA on a buffer which offset or size
112 * is not aligned on a 4-byte boundary.
113 *
114 * It also appears the host to card DMA can corrupt
115 * data when the buffer is not aligned on a 64 byte
116 * boundary.
117 */
118 unsigned int miter_flags = SG_MITER_ATOMIC; /* Used from IRQ */
119
120 if (data->flags & MMC_DATA_READ)
121 miter_flags |= SG_MITER_TO_SG;
122 else
123 miter_flags |= SG_MITER_FROM_SG;
124
125 host->pio_size = data->blocks * data->blksz;
126 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, miter_flags);
127 if (!nodma)
128 dev_dbg(host->dev, "fallback to PIO for data\n");
129 host->use_pio = true;
130 return 1;
131 } else {
132 dma_addr_t phys_addr;
133
134 host->sg_frags = dma_map_sg(mmc_dev(host->mmc),
135 data->sg, data->sg_len,
136 mmc_get_dma_dir(data));
137 phys_addr = sg_dma_address(data->sg);
138 mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
139 mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
140 host->use_pio = false;
141 return 0;
142 }
143 }
144
mvsd_request(struct mmc_host * mmc,struct mmc_request * mrq)145 static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
146 {
147 struct mvsd_host *host = mmc_priv(mmc);
148 void __iomem *iobase = host->base;
149 struct mmc_command *cmd = mrq->cmd;
150 u32 cmdreg = 0, xfer = 0, intr = 0;
151 unsigned long flags;
152 unsigned int timeout;
153
154 BUG_ON(host->mrq != NULL);
155 host->mrq = mrq;
156
157 dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
158 cmd->opcode, mvsd_read(MVSD_HW_STATE));
159
160 cmdreg = MVSD_CMD_INDEX(cmd->opcode);
161
162 if (cmd->flags & MMC_RSP_BUSY)
163 cmdreg |= MVSD_CMD_RSP_48BUSY;
164 else if (cmd->flags & MMC_RSP_136)
165 cmdreg |= MVSD_CMD_RSP_136;
166 else if (cmd->flags & MMC_RSP_PRESENT)
167 cmdreg |= MVSD_CMD_RSP_48;
168 else
169 cmdreg |= MVSD_CMD_RSP_NONE;
170
171 if (cmd->flags & MMC_RSP_CRC)
172 cmdreg |= MVSD_CMD_CHECK_CMDCRC;
173
174 if (cmd->flags & MMC_RSP_OPCODE)
175 cmdreg |= MVSD_CMD_INDX_CHECK;
176
177 if (cmd->flags & MMC_RSP_PRESENT) {
178 cmdreg |= MVSD_UNEXPECTED_RESP;
179 intr |= MVSD_NOR_UNEXP_RSP;
180 }
181
182 if (mrq->data) {
183 struct mmc_data *data = mrq->data;
184 int pio;
185
186 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
187 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
188 if (data->flags & MMC_DATA_READ)
189 xfer |= MVSD_XFER_MODE_TO_HOST;
190
191 pio = mvsd_setup_data(host, data);
192 if (pio) {
193 xfer |= MVSD_XFER_MODE_PIO;
194 /* PIO section of mvsd_irq has comments on those bits */
195 if (data->flags & MMC_DATA_WRITE)
196 intr |= MVSD_NOR_TX_AVAIL;
197 else if (host->pio_size > 32)
198 intr |= MVSD_NOR_RX_FIFO_8W;
199 else
200 intr |= MVSD_NOR_RX_READY;
201 }
202
203 if (data->stop) {
204 struct mmc_command *stop = data->stop;
205 u32 cmd12reg = 0;
206
207 mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
208 mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
209
210 if (stop->flags & MMC_RSP_BUSY)
211 cmd12reg |= MVSD_AUTOCMD12_BUSY;
212 if (stop->flags & MMC_RSP_OPCODE)
213 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
214 cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
215 mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
216
217 xfer |= MVSD_XFER_MODE_AUTO_CMD12;
218 intr |= MVSD_NOR_AUTOCMD12_DONE;
219 } else {
220 intr |= MVSD_NOR_XFER_DONE;
221 }
222 } else {
223 intr |= MVSD_NOR_CMD_DONE;
224 }
225
226 mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
227 mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
228
229 spin_lock_irqsave(&host->lock, flags);
230
231 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
232 host->xfer_mode |= xfer;
233 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
234
235 mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
236 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
237 mvsd_write(MVSD_CMD, cmdreg);
238
239 host->intr_en &= MVSD_NOR_CARD_INT;
240 host->intr_en |= intr | MVSD_NOR_ERROR;
241 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
242 mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
243
244 timeout = cmd->busy_timeout ? cmd->busy_timeout : 5000;
245 mod_timer(&host->timer, jiffies + msecs_to_jiffies(timeout));
246
247 spin_unlock_irqrestore(&host->lock, flags);
248 }
249
mvsd_finish_cmd(struct mvsd_host * host,struct mmc_command * cmd,u32 err_status)250 static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
251 u32 err_status)
252 {
253 void __iomem *iobase = host->base;
254
255 if (cmd->flags & MMC_RSP_136) {
256 unsigned int response[8], i;
257 for (i = 0; i < 8; i++)
258 response[i] = mvsd_read(MVSD_RSP(i));
259 cmd->resp[0] = ((response[0] & 0x03ff) << 22) |
260 ((response[1] & 0xffff) << 6) |
261 ((response[2] & 0xfc00) >> 10);
262 cmd->resp[1] = ((response[2] & 0x03ff) << 22) |
263 ((response[3] & 0xffff) << 6) |
264 ((response[4] & 0xfc00) >> 10);
265 cmd->resp[2] = ((response[4] & 0x03ff) << 22) |
266 ((response[5] & 0xffff) << 6) |
267 ((response[6] & 0xfc00) >> 10);
268 cmd->resp[3] = ((response[6] & 0x03ff) << 22) |
269 ((response[7] & 0x3fff) << 8);
270 } else if (cmd->flags & MMC_RSP_PRESENT) {
271 unsigned int response[3], i;
272 for (i = 0; i < 3; i++)
273 response[i] = mvsd_read(MVSD_RSP(i));
274 cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
275 ((response[1] & 0xffff) << (14 - 8)) |
276 ((response[0] & 0x03ff) << (30 - 8));
277 cmd->resp[1] = ((response[0] & 0xfc00) >> 10);
278 cmd->resp[2] = 0;
279 cmd->resp[3] = 0;
280 }
281
282 if (err_status & MVSD_ERR_CMD_TIMEOUT) {
283 cmd->error = -ETIMEDOUT;
284 } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
285 MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
286 cmd->error = -EILSEQ;
287 }
288 err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
289 MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
290 MVSD_ERR_CMD_STARTBIT);
291
292 return err_status;
293 }
294
mvsd_finish_data(struct mvsd_host * host,struct mmc_data * data,u32 err_status)295 static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
296 u32 err_status)
297 {
298 void __iomem *iobase = host->base;
299
300 if (host->use_pio) {
301 sg_miter_stop(&host->sg_miter);
302 host->pio_size = 0;
303 } else {
304 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
305 mmc_get_dma_dir(data));
306 }
307
308 if (err_status & MVSD_ERR_DATA_TIMEOUT)
309 data->error = -ETIMEDOUT;
310 else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
311 data->error = -EILSEQ;
312 else if (err_status & MVSD_ERR_XFER_SIZE)
313 data->error = -EBADE;
314 err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
315 MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
316
317 dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
318 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
319 data->bytes_xfered =
320 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
321 /* We can't be sure about the last block when errors are detected */
322 if (data->bytes_xfered && data->error)
323 data->bytes_xfered -= data->blksz;
324
325 /* Handle Auto cmd 12 response */
326 if (data->stop) {
327 unsigned int response[3], i;
328 for (i = 0; i < 3; i++)
329 response[i] = mvsd_read(MVSD_AUTO_RSP(i));
330 data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
331 ((response[1] & 0xffff) << (14 - 8)) |
332 ((response[0] & 0x03ff) << (30 - 8));
333 data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
334 data->stop->resp[2] = 0;
335 data->stop->resp[3] = 0;
336
337 if (err_status & MVSD_ERR_AUTOCMD12) {
338 u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
339 dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
340 if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
341 data->stop->error = -ENOEXEC;
342 else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
343 data->stop->error = -ETIMEDOUT;
344 else if (err_cmd12)
345 data->stop->error = -EILSEQ;
346 err_status &= ~MVSD_ERR_AUTOCMD12;
347 }
348 }
349
350 return err_status;
351 }
352
mvsd_irq(int irq,void * dev)353 static irqreturn_t mvsd_irq(int irq, void *dev)
354 {
355 struct mvsd_host *host = dev;
356 struct sg_mapping_iter *sgm = &host->sg_miter;
357 void __iomem *iobase = host->base;
358 u32 intr_status, intr_done_mask;
359 int irq_handled = 0;
360 u16 *p;
361 int s;
362
363 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
364 dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
365 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
366 mvsd_read(MVSD_HW_STATE));
367
368 /*
369 * It looks like, SDIO IP can issue one late, spurious irq
370 * although all irqs should be disabled. To work around this,
371 * bail out early, if we didn't expect any irqs to occur.
372 */
373 if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) {
374 dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n",
375 mvsd_read(MVSD_NOR_INTR_STATUS),
376 mvsd_read(MVSD_NOR_INTR_EN),
377 mvsd_read(MVSD_ERR_INTR_STATUS),
378 mvsd_read(MVSD_ERR_INTR_EN));
379 return IRQ_HANDLED;
380 }
381
382 spin_lock(&host->lock);
383
384 /* PIO handling, if needed. Messy business... */
385 if (host->use_pio) {
386 /*
387 * As we set sgm->consumed this always gives a valid buffer
388 * position.
389 */
390 if (!sg_miter_next(sgm)) {
391 /* This should not happen */
392 dev_err(host->dev, "ran out of scatter segments\n");
393 spin_unlock(&host->lock);
394 host->intr_en &=
395 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W |
396 MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
397 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
398 return IRQ_HANDLED;
399 }
400 p = sgm->addr;
401 s = sgm->length;
402 if (s > host->pio_size)
403 s = host->pio_size;
404 }
405
406 if (host->use_pio &&
407 (intr_status & host->intr_en &
408 (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
409
410 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
411 readsw(iobase + MVSD_FIFO, p, 16);
412 p += 16;
413 s -= 32;
414 sgm->consumed += 32;
415 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
416 }
417 /*
418 * Normally we'd use < 32 here, but the RX_FIFO_8W bit
419 * doesn't appear to assert when there is exactly 32 bytes
420 * (8 words) left to fetch in a transfer.
421 */
422 if (s <= 32) {
423 while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
424 put_unaligned(mvsd_read(MVSD_FIFO), p++);
425 put_unaligned(mvsd_read(MVSD_FIFO), p++);
426 s -= 4;
427 sgm->consumed += 4;
428 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
429 }
430 if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
431 u16 val[2] = {0, 0};
432 val[0] = mvsd_read(MVSD_FIFO);
433 val[1] = mvsd_read(MVSD_FIFO);
434 memcpy(p, ((void *)&val) + 4 - s, s);
435 sgm->consumed += s;
436 s = 0;
437 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
438 }
439 /* PIO transfer done */
440 host->pio_size -= sgm->consumed;
441 if (host->pio_size == 0) {
442 host->intr_en &=
443 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
444 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
445 } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
446 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
447 host->intr_en |= MVSD_NOR_RX_READY;
448 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
449 }
450 }
451 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
452 s, intr_status, mvsd_read(MVSD_HW_STATE));
453 irq_handled = 1;
454 } else if (host->use_pio &&
455 (intr_status & host->intr_en &
456 (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
457 /*
458 * The TX_FIFO_8W bit is unreliable. When set, bursting
459 * 16 halfwords all at once in the FIFO drops data. Actually
460 * TX_AVAIL does go off after only one word is pushed even if
461 * TX_FIFO_8W remains set.
462 */
463 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
464 mvsd_write(MVSD_FIFO, get_unaligned(p++));
465 mvsd_write(MVSD_FIFO, get_unaligned(p++));
466 s -= 4;
467 sgm->consumed += 4;
468 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
469 }
470 if (s < 4) {
471 if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
472 u16 val[2] = {0, 0};
473 memcpy(((void *)&val) + 4 - s, p, s);
474 mvsd_write(MVSD_FIFO, val[0]);
475 mvsd_write(MVSD_FIFO, val[1]);
476 sgm->consumed += s;
477 s = 0;
478 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
479 }
480 /* PIO transfer done */
481 host->pio_size -= sgm->consumed;
482 if (host->pio_size == 0) {
483 host->intr_en &=
484 ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
485 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
486 }
487 }
488 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
489 s, intr_status, mvsd_read(MVSD_HW_STATE));
490 irq_handled = 1;
491 }
492
493 mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
494
495 intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
496 MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
497 if (intr_status & host->intr_en & ~intr_done_mask) {
498 struct mmc_request *mrq = host->mrq;
499 struct mmc_command *cmd = mrq->cmd;
500 u32 err_status = 0;
501
502 del_timer(&host->timer);
503 host->mrq = NULL;
504
505 host->intr_en &= MVSD_NOR_CARD_INT;
506 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
507 mvsd_write(MVSD_ERR_INTR_EN, 0);
508
509 spin_unlock(&host->lock);
510
511 if (intr_status & MVSD_NOR_UNEXP_RSP) {
512 cmd->error = -EPROTO;
513 } else if (intr_status & MVSD_NOR_ERROR) {
514 err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
515 dev_dbg(host->dev, "err 0x%04x\n", err_status);
516 }
517
518 err_status = mvsd_finish_cmd(host, cmd, err_status);
519 if (mrq->data)
520 err_status = mvsd_finish_data(host, mrq->data, err_status);
521 if (err_status) {
522 dev_err(host->dev, "unhandled error status %#04x\n",
523 err_status);
524 cmd->error = -ENOMSG;
525 }
526
527 mmc_request_done(host->mmc, mrq);
528 irq_handled = 1;
529 } else
530 spin_unlock(&host->lock);
531
532 if (intr_status & MVSD_NOR_CARD_INT) {
533 mmc_signal_sdio_irq(host->mmc);
534 irq_handled = 1;
535 }
536
537 if (irq_handled)
538 return IRQ_HANDLED;
539
540 dev_err(host->dev, "unhandled interrupt status=0x%04x en=0x%04x pio=%d\n",
541 intr_status, host->intr_en, host->pio_size);
542 return IRQ_NONE;
543 }
544
mvsd_timeout_timer(struct timer_list * t)545 static void mvsd_timeout_timer(struct timer_list *t)
546 {
547 struct mvsd_host *host = from_timer(host, t, timer);
548 void __iomem *iobase = host->base;
549 struct mmc_request *mrq;
550 unsigned long flags;
551
552 spin_lock_irqsave(&host->lock, flags);
553 mrq = host->mrq;
554 if (mrq) {
555 dev_err(host->dev, "Timeout waiting for hardware interrupt.\n");
556 dev_err(host->dev, "hw_state=0x%04x, intr_status=0x%04x intr_en=0x%04x\n",
557 mvsd_read(MVSD_HW_STATE),
558 mvsd_read(MVSD_NOR_INTR_STATUS),
559 mvsd_read(MVSD_NOR_INTR_EN));
560
561 host->mrq = NULL;
562
563 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
564
565 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
566 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
567
568 host->intr_en &= MVSD_NOR_CARD_INT;
569 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
570 mvsd_write(MVSD_ERR_INTR_EN, 0);
571 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
572
573 mrq->cmd->error = -ETIMEDOUT;
574 mvsd_finish_cmd(host, mrq->cmd, 0);
575 if (mrq->data) {
576 mrq->data->error = -ETIMEDOUT;
577 mvsd_finish_data(host, mrq->data, 0);
578 }
579 }
580 spin_unlock_irqrestore(&host->lock, flags);
581
582 if (mrq)
583 mmc_request_done(host->mmc, mrq);
584 }
585
mvsd_enable_sdio_irq(struct mmc_host * mmc,int enable)586 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
587 {
588 struct mvsd_host *host = mmc_priv(mmc);
589 void __iomem *iobase = host->base;
590 unsigned long flags;
591
592 spin_lock_irqsave(&host->lock, flags);
593 if (enable) {
594 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
595 host->intr_en |= MVSD_NOR_CARD_INT;
596 } else {
597 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
598 host->intr_en &= ~MVSD_NOR_CARD_INT;
599 }
600 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
601 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
602 spin_unlock_irqrestore(&host->lock, flags);
603 }
604
mvsd_power_up(struct mvsd_host * host)605 static void mvsd_power_up(struct mvsd_host *host)
606 {
607 void __iomem *iobase = host->base;
608 dev_dbg(host->dev, "power up\n");
609 mvsd_write(MVSD_NOR_INTR_EN, 0);
610 mvsd_write(MVSD_ERR_INTR_EN, 0);
611 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
612 mvsd_write(MVSD_XFER_MODE, 0);
613 mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
614 mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
615 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
616 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
617 }
618
mvsd_power_down(struct mvsd_host * host)619 static void mvsd_power_down(struct mvsd_host *host)
620 {
621 void __iomem *iobase = host->base;
622 dev_dbg(host->dev, "power down\n");
623 mvsd_write(MVSD_NOR_INTR_EN, 0);
624 mvsd_write(MVSD_ERR_INTR_EN, 0);
625 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
626 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
627 mvsd_write(MVSD_NOR_STATUS_EN, 0);
628 mvsd_write(MVSD_ERR_STATUS_EN, 0);
629 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
630 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
631 }
632
mvsd_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)633 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
634 {
635 struct mvsd_host *host = mmc_priv(mmc);
636 void __iomem *iobase = host->base;
637 u32 ctrl_reg = 0;
638
639 if (ios->power_mode == MMC_POWER_UP)
640 mvsd_power_up(host);
641
642 if (ios->clock == 0) {
643 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
644 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
645 host->clock = 0;
646 dev_dbg(host->dev, "clock off\n");
647 } else if (ios->clock != host->clock) {
648 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
649 if (m > MVSD_BASE_DIV_MAX)
650 m = MVSD_BASE_DIV_MAX;
651 mvsd_write(MVSD_CLK_DIV, m);
652 host->clock = ios->clock;
653 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
654 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
655 ios->clock, host->base_clock / (m+1), m);
656 }
657
658 /* default transfer mode */
659 ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
660 ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
661
662 /* default to maximum timeout */
663 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
664 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
665
666 if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
667 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
668
669 if (ios->bus_width == MMC_BUS_WIDTH_4)
670 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
671
672 /*
673 * The HI_SPEED_EN bit is causing trouble with many (but not all)
674 * high speed SD, SDHC and SDIO cards. Not enabling that bit
675 * makes all cards work. So let's just ignore that bit for now
676 * and revisit this issue if problems for not enabling this bit
677 * are ever reported.
678 */
679 #if 0
680 if (ios->timing == MMC_TIMING_MMC_HS ||
681 ios->timing == MMC_TIMING_SD_HS)
682 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
683 #endif
684
685 host->ctrl = ctrl_reg;
686 mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
687 dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
688 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
689 "push-pull" : "open-drain",
690 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
691 "4bit-width" : "1bit-width",
692 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
693 "high-speed" : "");
694
695 if (ios->power_mode == MMC_POWER_OFF)
696 mvsd_power_down(host);
697 }
698
699 static const struct mmc_host_ops mvsd_ops = {
700 .request = mvsd_request,
701 .get_ro = mmc_gpio_get_ro,
702 .set_ios = mvsd_set_ios,
703 .enable_sdio_irq = mvsd_enable_sdio_irq,
704 };
705
706 static void
mv_conf_mbus_windows(struct mvsd_host * host,const struct mbus_dram_target_info * dram)707 mv_conf_mbus_windows(struct mvsd_host *host,
708 const struct mbus_dram_target_info *dram)
709 {
710 void __iomem *iobase = host->base;
711 int i;
712
713 for (i = 0; i < 4; i++) {
714 writel(0, iobase + MVSD_WINDOW_CTRL(i));
715 writel(0, iobase + MVSD_WINDOW_BASE(i));
716 }
717
718 for (i = 0; i < dram->num_cs; i++) {
719 const struct mbus_dram_window *cs = dram->cs + i;
720 writel(((cs->size - 1) & 0xffff0000) |
721 (cs->mbus_attr << 8) |
722 (dram->mbus_dram_target_id << 4) | 1,
723 iobase + MVSD_WINDOW_CTRL(i));
724 writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
725 }
726 }
727
mvsd_probe(struct platform_device * pdev)728 static int mvsd_probe(struct platform_device *pdev)
729 {
730 struct device_node *np = pdev->dev.of_node;
731 struct mmc_host *mmc = NULL;
732 struct mvsd_host *host = NULL;
733 const struct mbus_dram_target_info *dram;
734 int ret, irq;
735
736 if (!np) {
737 dev_err(&pdev->dev, "no DT node\n");
738 return -ENODEV;
739 }
740 irq = platform_get_irq(pdev, 0);
741 if (irq < 0)
742 return irq;
743
744 mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
745 if (!mmc) {
746 ret = -ENOMEM;
747 goto out;
748 }
749
750 host = mmc_priv(mmc);
751 host->mmc = mmc;
752 host->dev = &pdev->dev;
753
754 /*
755 * Some non-DT platforms do not pass a clock, and the clock
756 * frequency is passed through platform_data. On DT platforms,
757 * a clock must always be passed, even if there is no gatable
758 * clock associated to the SDIO interface (it can simply be a
759 * fixed rate clock).
760 */
761 host->clk = devm_clk_get(&pdev->dev, NULL);
762 if (IS_ERR(host->clk)) {
763 dev_err(&pdev->dev, "no clock associated\n");
764 ret = -EINVAL;
765 goto out;
766 }
767 clk_prepare_enable(host->clk);
768
769 mmc->ops = &mvsd_ops;
770
771 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
772
773 mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
774 mmc->f_max = MVSD_CLOCKRATE_MAX;
775
776 mmc->max_blk_size = 2048;
777 mmc->max_blk_count = 65535;
778
779 mmc->max_segs = 1;
780 mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
781 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
782
783 host->base_clock = clk_get_rate(host->clk) / 2;
784 ret = mmc_of_parse(mmc);
785 if (ret < 0)
786 goto out;
787 if (maxfreq)
788 mmc->f_max = maxfreq;
789
790 spin_lock_init(&host->lock);
791
792 host->base = devm_platform_ioremap_resource(pdev, 0);
793 if (IS_ERR(host->base)) {
794 ret = PTR_ERR(host->base);
795 goto out;
796 }
797
798 /* (Re-)program MBUS remapping windows if we are asked to. */
799 dram = mv_mbus_dram_info();
800 if (dram)
801 mv_conf_mbus_windows(host, dram);
802
803 mvsd_power_down(host);
804
805 ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host);
806 if (ret) {
807 dev_err(&pdev->dev, "cannot assign irq %d\n", irq);
808 goto out;
809 }
810
811 timer_setup(&host->timer, mvsd_timeout_timer, 0);
812 platform_set_drvdata(pdev, mmc);
813 ret = mmc_add_host(mmc);
814 if (ret)
815 goto out;
816
817 if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
818 dev_dbg(&pdev->dev, "using GPIO for card detection\n");
819 else
820 dev_dbg(&pdev->dev, "lacking card detect (fall back to polling)\n");
821
822 return 0;
823
824 out:
825 if (mmc) {
826 if (!IS_ERR(host->clk))
827 clk_disable_unprepare(host->clk);
828 mmc_free_host(mmc);
829 }
830
831 return ret;
832 }
833
mvsd_remove(struct platform_device * pdev)834 static void mvsd_remove(struct platform_device *pdev)
835 {
836 struct mmc_host *mmc = platform_get_drvdata(pdev);
837
838 struct mvsd_host *host = mmc_priv(mmc);
839
840 mmc_remove_host(mmc);
841 del_timer_sync(&host->timer);
842 mvsd_power_down(host);
843
844 if (!IS_ERR(host->clk))
845 clk_disable_unprepare(host->clk);
846 mmc_free_host(mmc);
847 }
848
849 static const struct of_device_id mvsdio_dt_ids[] = {
850 { .compatible = "marvell,orion-sdio" },
851 { /* sentinel */ }
852 };
853 MODULE_DEVICE_TABLE(of, mvsdio_dt_ids);
854
855 static struct platform_driver mvsd_driver = {
856 .probe = mvsd_probe,
857 .remove_new = mvsd_remove,
858 .driver = {
859 .name = DRIVER_NAME,
860 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
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");
877