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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / mmc / host / mvsdio.c
blob203b617126014aaa5062e69636045c4b37fc6a36
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 unsigned int pio_size;
42 void *pio_ptr;
43 unsigned int sg_frags;
44 unsigned int ns_per_clk;
45 unsigned int clock;
46 unsigned int base_clock;
47 struct timer_list timer;
48 struct mmc_host *mmc;
49 struct device *dev;
50 struct clk *clk;
51 };
52
53 #define mvsd_write(offs, val) writel(val, iobase + (offs))
54 #define mvsd_read(offs) readl(iobase + (offs))
55
56 static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
57 {
58 void __iomem *iobase = host->base;
59 unsigned int tmout;
60 int tmout_index;
61
62 /*
63 * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE
64 * register is sometimes not set before a while when some
65 * "unusual" data block sizes are used (such as with the SWITCH
66 * command), even despite the fact that the XFER_DONE interrupt
67 * was raised. And if another data transfer starts before
68 * this bit comes to good sense (which eventually happens by
69 * itself) then the new transfer simply fails with a timeout.
70 */
71 if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) {
72 unsigned long t = jiffies + HZ;
73 unsigned int hw_state, count = 0;
74 do {
75 hw_state = mvsd_read(MVSD_HW_STATE);
76 if (time_after(jiffies, t)) {
77 dev_warn(host->dev, "FIFO_EMPTY bit missing\n");
78 break;
79 }
80 count++;
81 } while (!(hw_state & (1 << 13)));
82 dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit "
83 "(hw=0x%04x, count=%d, jiffies=%ld)\n",
84 hw_state, count, jiffies - (t - HZ));
85 }
86
87 /* If timeout=0 then maximum timeout index is used. */
88 tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
89 tmout += data->timeout_clks;
90 tmout_index = fls(tmout - 1) - 12;
91 if (tmout_index < 0)
92 tmout_index = 0;
93 if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
94 tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
95
96 dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
97 (data->flags & MMC_DATA_READ) ? "read" : "write",
98 (u32)sg_virt(data->sg), data->blocks, data->blksz,
99 tmout, tmout_index);
100
101 host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
102 host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
103 mvsd_write(MVSD_HOST_CTRL, host->ctrl);
104 mvsd_write(MVSD_BLK_COUNT, data->blocks);
105 mvsd_write(MVSD_BLK_SIZE, data->blksz);
106
107 if (nodma || (data->blksz | data->sg->offset) & 3 ||
108 ((!(data->flags & MMC_DATA_READ) && data->sg->offset & 0x3f))) {
109 /*
110 * We cannot do DMA on a buffer which offset or size
111 * is not aligned on a 4-byte boundary.
112 *
113 * It also appears the host to card DMA can corrupt
114 * data when the buffer is not aligned on a 64 byte
115 * boundary.
116 */
117 host->pio_size = data->blocks * data->blksz;
118 host->pio_ptr = sg_virt(data->sg);
119 if (!nodma)
120 dev_dbg(host->dev, "fallback to PIO for data at 0x%p size %d\n",
121 host->pio_ptr, host->pio_size);
122 return 1;
123 } else {
124 dma_addr_t phys_addr;
125
126 host->sg_frags = dma_map_sg(mmc_dev(host->mmc),
127 data->sg, data->sg_len,
128 mmc_get_dma_dir(data));
129 phys_addr = sg_dma_address(data->sg);
130 mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
131 mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
132 return 0;
133 }
134 }
135
136 static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
137 {
138 struct mvsd_host *host = mmc_priv(mmc);
139 void __iomem *iobase = host->base;
140 struct mmc_command *cmd = mrq->cmd;
141 u32 cmdreg = 0, xfer = 0, intr = 0;
142 unsigned long flags;
143 unsigned int timeout;
144
145 BUG_ON(host->mrq != NULL);
146 host->mrq = mrq;
147
148 dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
149 cmd->opcode, mvsd_read(MVSD_HW_STATE));
150
151 cmdreg = MVSD_CMD_INDEX(cmd->opcode);
152
153 if (cmd->flags & MMC_RSP_BUSY)
154 cmdreg |= MVSD_CMD_RSP_48BUSY;
155 else if (cmd->flags & MMC_RSP_136)
156 cmdreg |= MVSD_CMD_RSP_136;
157 else if (cmd->flags & MMC_RSP_PRESENT)
158 cmdreg |= MVSD_CMD_RSP_48;
159 else
160 cmdreg |= MVSD_CMD_RSP_NONE;
161
162 if (cmd->flags & MMC_RSP_CRC)
163 cmdreg |= MVSD_CMD_CHECK_CMDCRC;
164
165 if (cmd->flags & MMC_RSP_OPCODE)
166 cmdreg |= MVSD_CMD_INDX_CHECK;
167
168 if (cmd->flags & MMC_RSP_PRESENT) {
169 cmdreg |= MVSD_UNEXPECTED_RESP;
170 intr |= MVSD_NOR_UNEXP_RSP;
171 }
172
173 if (mrq->data) {
174 struct mmc_data *data = mrq->data;
175 int pio;
176
177 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
178 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
179 if (data->flags & MMC_DATA_READ)
180 xfer |= MVSD_XFER_MODE_TO_HOST;
181
182 pio = mvsd_setup_data(host, data);
183 if (pio) {
184 xfer |= MVSD_XFER_MODE_PIO;
185 /* PIO section of mvsd_irq has comments on those bits */
186 if (data->flags & MMC_DATA_WRITE)
187 intr |= MVSD_NOR_TX_AVAIL;
188 else if (host->pio_size > 32)
189 intr |= MVSD_NOR_RX_FIFO_8W;
190 else
191 intr |= MVSD_NOR_RX_READY;
192 }
193
194 if (data->stop) {
195 struct mmc_command *stop = data->stop;
196 u32 cmd12reg = 0;
197
198 mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
199 mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
200
201 if (stop->flags & MMC_RSP_BUSY)
202 cmd12reg |= MVSD_AUTOCMD12_BUSY;
203 if (stop->flags & MMC_RSP_OPCODE)
204 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
205 cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
206 mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
207
208 xfer |= MVSD_XFER_MODE_AUTO_CMD12;
209 intr |= MVSD_NOR_AUTOCMD12_DONE;
210 } else {
211 intr |= MVSD_NOR_XFER_DONE;
212 }
213 } else {
214 intr |= MVSD_NOR_CMD_DONE;
215 }
216
217 mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
218 mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
219
220 spin_lock_irqsave(&host->lock, flags);
221
222 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
223 host->xfer_mode |= xfer;
224 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
225
226 mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
227 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
228 mvsd_write(MVSD_CMD, cmdreg);
229
230 host->intr_en &= MVSD_NOR_CARD_INT;
231 host->intr_en |= intr | MVSD_NOR_ERROR;
232 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
233 mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
234
235 timeout = cmd->busy_timeout ? cmd->busy_timeout : 5000;
236 mod_timer(&host->timer, jiffies + msecs_to_jiffies(timeout));
237
238 spin_unlock_irqrestore(&host->lock, flags);
239 }
240
241 static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
242 u32 err_status)
243 {
244 void __iomem *iobase = host->base;
245
246 if (cmd->flags & MMC_RSP_136) {
247 unsigned int response[8], i;
248 for (i = 0; i < 8; i++)
249 response[i] = mvsd_read(MVSD_RSP(i));
250 cmd->resp[0] = ((response[0] & 0x03ff) << 22) |
251 ((response[1] & 0xffff) << 6) |
252 ((response[2] & 0xfc00) >> 10);
253 cmd->resp[1] = ((response[2] & 0x03ff) << 22) |
254 ((response[3] & 0xffff) << 6) |
255 ((response[4] & 0xfc00) >> 10);
256 cmd->resp[2] = ((response[4] & 0x03ff) << 22) |
257 ((response[5] & 0xffff) << 6) |
258 ((response[6] & 0xfc00) >> 10);
259 cmd->resp[3] = ((response[6] & 0x03ff) << 22) |
260 ((response[7] & 0x3fff) << 8);
261 } else if (cmd->flags & MMC_RSP_PRESENT) {
262 unsigned int response[3], i;
263 for (i = 0; i < 3; i++)
264 response[i] = mvsd_read(MVSD_RSP(i));
265 cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
266 ((response[1] & 0xffff) << (14 - 8)) |
267 ((response[0] & 0x03ff) << (30 - 8));
268 cmd->resp[1] = ((response[0] & 0xfc00) >> 10);
269 cmd->resp[2] = 0;
270 cmd->resp[3] = 0;
271 }
272
273 if (err_status & MVSD_ERR_CMD_TIMEOUT) {
274 cmd->error = -ETIMEDOUT;
275 } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
276 MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
277 cmd->error = -EILSEQ;
278 }
279 err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
280 MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
281 MVSD_ERR_CMD_STARTBIT);
282
283 return err_status;
284 }
285
286 static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
287 u32 err_status)
288 {
289 void __iomem *iobase = host->base;
290
291 if (host->pio_ptr) {
292 host->pio_ptr = NULL;
293 host->pio_size = 0;
294 } else {
295 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
296 mmc_get_dma_dir(data));
297 }
298
299 if (err_status & MVSD_ERR_DATA_TIMEOUT)
300 data->error = -ETIMEDOUT;
301 else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
302 data->error = -EILSEQ;
303 else if (err_status & MVSD_ERR_XFER_SIZE)
304 data->error = -EBADE;
305 err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
306 MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
307
308 dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
309 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
310 data->bytes_xfered =
311 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
312 /* We can't be sure about the last block when errors are detected */
313 if (data->bytes_xfered && data->error)
314 data->bytes_xfered -= data->blksz;
315
316 /* Handle Auto cmd 12 response */
317 if (data->stop) {
318 unsigned int response[3], i;
319 for (i = 0; i < 3; i++)
320 response[i] = mvsd_read(MVSD_AUTO_RSP(i));
321 data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
322 ((response[1] & 0xffff) << (14 - 8)) |
323 ((response[0] & 0x03ff) << (30 - 8));
324 data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
325 data->stop->resp[2] = 0;
326 data->stop->resp[3] = 0;
327
328 if (err_status & MVSD_ERR_AUTOCMD12) {
329 u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
330 dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
331 if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
332 data->stop->error = -ENOEXEC;
333 else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
334 data->stop->error = -ETIMEDOUT;
335 else if (err_cmd12)
336 data->stop->error = -EILSEQ;
337 err_status &= ~MVSD_ERR_AUTOCMD12;
338 }
339 }
340
341 return err_status;
342 }
343
344 static irqreturn_t mvsd_irq(int irq, void *dev)
345 {
346 struct mvsd_host *host = dev;
347 void __iomem *iobase = host->base;
348 u32 intr_status, intr_done_mask;
349 int irq_handled = 0;
350
351 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
352 dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
353 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
354 mvsd_read(MVSD_HW_STATE));
355
356 /*
357 * It looks like, SDIO IP can issue one late, spurious irq
358 * although all irqs should be disabled. To work around this,
359 * bail out early, if we didn't expect any irqs to occur.
360 */
361 if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) {
362 dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n",
363 mvsd_read(MVSD_NOR_INTR_STATUS),
364 mvsd_read(MVSD_NOR_INTR_EN),
365 mvsd_read(MVSD_ERR_INTR_STATUS),
366 mvsd_read(MVSD_ERR_INTR_EN));
367 return IRQ_HANDLED;
368 }
369
370 spin_lock(&host->lock);
371
372 /* PIO handling, if needed. Messy business... */
373 if (host->pio_size &&
374 (intr_status & host->intr_en &
375 (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
376 u16 *p = host->pio_ptr;
377 int s = host->pio_size;
378 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
379 readsw(iobase + MVSD_FIFO, p, 16);
380 p += 16;
381 s -= 32;
382 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
383 }
384 /*
385 * Normally we'd use < 32 here, but the RX_FIFO_8W bit
386 * doesn't appear to assert when there is exactly 32 bytes
387 * (8 words) left to fetch in a transfer.
388 */
389 if (s <= 32) {
390 while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
391 put_unaligned(mvsd_read(MVSD_FIFO), p++);
392 put_unaligned(mvsd_read(MVSD_FIFO), p++);
393 s -= 4;
394 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
395 }
396 if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
397 u16 val[2] = {0, 0};
398 val[0] = mvsd_read(MVSD_FIFO);
399 val[1] = mvsd_read(MVSD_FIFO);
400 memcpy(p, ((void *)&val) + 4 - s, s);
401 s = 0;
402 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
403 }
404 if (s == 0) {
405 host->intr_en &=
406 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
407 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
408 } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
409 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
410 host->intr_en |= MVSD_NOR_RX_READY;
411 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
412 }
413 }
414 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
415 s, intr_status, mvsd_read(MVSD_HW_STATE));
416 host->pio_ptr = p;
417 host->pio_size = s;
418 irq_handled = 1;
419 } else if (host->pio_size &&
420 (intr_status & host->intr_en &
421 (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
422 u16 *p = host->pio_ptr;
423 int s = host->pio_size;
424 /*
425 * The TX_FIFO_8W bit is unreliable. When set, bursting
426 * 16 halfwords all at once in the FIFO drops data. Actually
427 * TX_AVAIL does go off after only one word is pushed even if
428 * TX_FIFO_8W remains set.
429 */
430 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
431 mvsd_write(MVSD_FIFO, get_unaligned(p++));
432 mvsd_write(MVSD_FIFO, get_unaligned(p++));
433 s -= 4;
434 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
435 }
436 if (s < 4) {
437 if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
438 u16 val[2] = {0, 0};
439 memcpy(((void *)&val) + 4 - s, p, s);
440 mvsd_write(MVSD_FIFO, val[0]);
441 mvsd_write(MVSD_FIFO, val[1]);
442 s = 0;
443 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
444 }
445 if (s == 0) {
446 host->intr_en &=
447 ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
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 host->pio_ptr = p;
454 host->pio_size = s;
455 irq_handled = 1;
456 }
457
458 mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
459
460 intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
461 MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
462 if (intr_status & host->intr_en & ~intr_done_mask) {
463 struct mmc_request *mrq = host->mrq;
464 struct mmc_command *cmd = mrq->cmd;
465 u32 err_status = 0;
466
467 del_timer(&host->timer);
468 host->mrq = NULL;
469
470 host->intr_en &= MVSD_NOR_CARD_INT;
471 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
472 mvsd_write(MVSD_ERR_INTR_EN, 0);
473
474 spin_unlock(&host->lock);
475
476 if (intr_status & MVSD_NOR_UNEXP_RSP) {
477 cmd->error = -EPROTO;
478 } else if (intr_status & MVSD_NOR_ERROR) {
479 err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
480 dev_dbg(host->dev, "err 0x%04x\n", err_status);
481 }
482
483 err_status = mvsd_finish_cmd(host, cmd, err_status);
484 if (mrq->data)
485 err_status = mvsd_finish_data(host, mrq->data, err_status);
486 if (err_status) {
487 dev_err(host->dev, "unhandled error status %#04x\n",
488 err_status);
489 cmd->error = -ENOMSG;
490 }
491
492 mmc_request_done(host->mmc, mrq);
493 irq_handled = 1;
494 } else
495 spin_unlock(&host->lock);
496
497 if (intr_status & MVSD_NOR_CARD_INT) {
498 mmc_signal_sdio_irq(host->mmc);
499 irq_handled = 1;
500 }
501
502 if (irq_handled)
503 return IRQ_HANDLED;
504
505 dev_err(host->dev, "unhandled interrupt status=0x%04x en=0x%04x pio=%d\n",
506 intr_status, host->intr_en, host->pio_size);
507 return IRQ_NONE;
508 }
509
510 static void mvsd_timeout_timer(struct timer_list *t)
511 {
512 struct mvsd_host *host = from_timer(host, t, timer);
513 void __iomem *iobase = host->base;
514 struct mmc_request *mrq;
515 unsigned long flags;
516
517 spin_lock_irqsave(&host->lock, flags);
518 mrq = host->mrq;
519 if (mrq) {
520 dev_err(host->dev, "Timeout waiting for hardware interrupt.\n");
521 dev_err(host->dev, "hw_state=0x%04x, intr_status=0x%04x intr_en=0x%04x\n",
522 mvsd_read(MVSD_HW_STATE),
523 mvsd_read(MVSD_NOR_INTR_STATUS),
524 mvsd_read(MVSD_NOR_INTR_EN));
525
526 host->mrq = NULL;
527
528 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
529
530 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
531 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
532
533 host->intr_en &= MVSD_NOR_CARD_INT;
534 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
535 mvsd_write(MVSD_ERR_INTR_EN, 0);
536 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
537
538 mrq->cmd->error = -ETIMEDOUT;
539 mvsd_finish_cmd(host, mrq->cmd, 0);
540 if (mrq->data) {
541 mrq->data->error = -ETIMEDOUT;
542 mvsd_finish_data(host, mrq->data, 0);
543 }
544 }
545 spin_unlock_irqrestore(&host->lock, flags);
546
547 if (mrq)
548 mmc_request_done(host->mmc, mrq);
549 }
550
551 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
552 {
553 struct mvsd_host *host = mmc_priv(mmc);
554 void __iomem *iobase = host->base;
555 unsigned long flags;
556
557 spin_lock_irqsave(&host->lock, flags);
558 if (enable) {
559 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
560 host->intr_en |= MVSD_NOR_CARD_INT;
561 } else {
562 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
563 host->intr_en &= ~MVSD_NOR_CARD_INT;
564 }
565 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
566 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
567 spin_unlock_irqrestore(&host->lock, flags);
568 }
569
570 static void mvsd_power_up(struct mvsd_host *host)
571 {
572 void __iomem *iobase = host->base;
573 dev_dbg(host->dev, "power up\n");
574 mvsd_write(MVSD_NOR_INTR_EN, 0);
575 mvsd_write(MVSD_ERR_INTR_EN, 0);
576 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
577 mvsd_write(MVSD_XFER_MODE, 0);
578 mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
579 mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
580 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
581 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
582 }
583
584 static void mvsd_power_down(struct mvsd_host *host)
585 {
586 void __iomem *iobase = host->base;
587 dev_dbg(host->dev, "power down\n");
588 mvsd_write(MVSD_NOR_INTR_EN, 0);
589 mvsd_write(MVSD_ERR_INTR_EN, 0);
590 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
591 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
592 mvsd_write(MVSD_NOR_STATUS_EN, 0);
593 mvsd_write(MVSD_ERR_STATUS_EN, 0);
594 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
595 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
596 }
597
598 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
599 {
600 struct mvsd_host *host = mmc_priv(mmc);
601 void __iomem *iobase = host->base;
602 u32 ctrl_reg = 0;
603
604 if (ios->power_mode == MMC_POWER_UP)
605 mvsd_power_up(host);
606
607 if (ios->clock == 0) {
608 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
609 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
610 host->clock = 0;
611 dev_dbg(host->dev, "clock off\n");
612 } else if (ios->clock != host->clock) {
613 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
614 if (m > MVSD_BASE_DIV_MAX)
615 m = MVSD_BASE_DIV_MAX;
616 mvsd_write(MVSD_CLK_DIV, m);
617 host->clock = ios->clock;
618 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
619 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
620 ios->clock, host->base_clock / (m+1), m);
621 }
622
623 /* default transfer mode */
624 ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
625 ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
626
627 /* default to maximum timeout */
628 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
629 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
630
631 if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
632 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
633
634 if (ios->bus_width == MMC_BUS_WIDTH_4)
635 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
636
637 /*
638 * The HI_SPEED_EN bit is causing trouble with many (but not all)
639 * high speed SD, SDHC and SDIO cards. Not enabling that bit
640 * makes all cards work. So let's just ignore that bit for now
641 * and revisit this issue if problems for not enabling this bit
642 * are ever reported.
643 */
644 #if 0
645 if (ios->timing == MMC_TIMING_MMC_HS ||
646 ios->timing == MMC_TIMING_SD_HS)
647 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
648 #endif
649
650 host->ctrl = ctrl_reg;
651 mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
652 dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
653 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
654 "push-pull" : "open-drain",
655 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
656 "4bit-width" : "1bit-width",
657 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
658 "high-speed" : "");
659
660 if (ios->power_mode == MMC_POWER_OFF)
661 mvsd_power_down(host);
662 }
663
664 static const struct mmc_host_ops mvsd_ops = {
665 .request = mvsd_request,
666 .get_ro = mmc_gpio_get_ro,
667 .set_ios = mvsd_set_ios,
668 .enable_sdio_irq = mvsd_enable_sdio_irq,
669 };
670
671 static void
672 mv_conf_mbus_windows(struct mvsd_host *host,
673 const struct mbus_dram_target_info *dram)
674 {
675 void __iomem *iobase = host->base;
676 int i;
677
678 for (i = 0; i < 4; i++) {
679 writel(0, iobase + MVSD_WINDOW_CTRL(i));
680 writel(0, iobase + MVSD_WINDOW_BASE(i));
681 }
682
683 for (i = 0; i < dram->num_cs; i++) {
684 const struct mbus_dram_window *cs = dram->cs + i;
685 writel(((cs->size - 1) & 0xffff0000) |
686 (cs->mbus_attr << 8) |
687 (dram->mbus_dram_target_id << 4) | 1,
688 iobase + MVSD_WINDOW_CTRL(i));
689 writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
690 }
691 }
692
693 static int mvsd_probe(struct platform_device *pdev)
694 {
695 struct device_node *np = pdev->dev.of_node;
696 struct mmc_host *mmc = NULL;
697 struct mvsd_host *host = NULL;
698 const struct mbus_dram_target_info *dram;
699 int ret, irq;
700
701 if (!np) {
702 dev_err(&pdev->dev, "no DT node\n");
703 return -ENODEV;
704 }
705 irq = platform_get_irq(pdev, 0);
706 if (irq < 0)
707 return -ENXIO;
708
709 mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
710 if (!mmc) {
711 ret = -ENOMEM;
712 goto out;
713 }
714
715 host = mmc_priv(mmc);
716 host->mmc = mmc;
717 host->dev = &pdev->dev;
718
719 /*
720 * Some non-DT platforms do not pass a clock, and the clock
721 * frequency is passed through platform_data. On DT platforms,
722 * a clock must always be passed, even if there is no gatable
723 * clock associated to the SDIO interface (it can simply be a
724 * fixed rate clock).
725 */
726 host->clk = devm_clk_get(&pdev->dev, NULL);
727 if (IS_ERR(host->clk)) {
728 dev_err(&pdev->dev, "no clock associated\n");
729 ret = -EINVAL;
730 goto out;
731 }
732 clk_prepare_enable(host->clk);
733
734 mmc->ops = &mvsd_ops;
735
736 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
737
738 mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
739 mmc->f_max = MVSD_CLOCKRATE_MAX;
740
741 mmc->max_blk_size = 2048;
742 mmc->max_blk_count = 65535;
743
744 mmc->max_segs = 1;
745 mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
746 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
747
748 host->base_clock = clk_get_rate(host->clk) / 2;
749 ret = mmc_of_parse(mmc);
750 if (ret < 0)
751 goto out;
752 if (maxfreq)
753 mmc->f_max = maxfreq;
754
755 mmc->caps |= MMC_CAP_ERASE;
756
757 spin_lock_init(&host->lock);
758
759 host->base = devm_platform_ioremap_resource(pdev, 0);
760 if (IS_ERR(host->base)) {
761 ret = PTR_ERR(host->base);
762 goto out;
763 }
764
765 /* (Re-)program MBUS remapping windows if we are asked to. */
766 dram = mv_mbus_dram_info();
767 if (dram)
768 mv_conf_mbus_windows(host, dram);
769
770 mvsd_power_down(host);
771
772 ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host);
773 if (ret) {
774 dev_err(&pdev->dev, "cannot assign irq %d\n", irq);
775 goto out;
776 }
777
778 timer_setup(&host->timer, mvsd_timeout_timer, 0);
779 platform_set_drvdata(pdev, mmc);
780 ret = mmc_add_host(mmc);
781 if (ret)
782 goto out;
783
784 if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
785 dev_dbg(&pdev->dev, "using GPIO for card detection\n");
786 else
787 dev_dbg(&pdev->dev, "lacking card detect (fall back to polling)\n");
788
789 return 0;
790
791 out:
792 if (mmc) {
793 if (!IS_ERR(host->clk))
794 clk_disable_unprepare(host->clk);
795 mmc_free_host(mmc);
796 }
797
798 return ret;
799 }
800
801 static int mvsd_remove(struct platform_device *pdev)
802 {
803 struct mmc_host *mmc = platform_get_drvdata(pdev);
804
805 struct mvsd_host *host = mmc_priv(mmc);
806
807 mmc_remove_host(mmc);
808 del_timer_sync(&host->timer);
809 mvsd_power_down(host);
810
811 if (!IS_ERR(host->clk))
812 clk_disable_unprepare(host->clk);
813 mmc_free_host(mmc);
814
815 return 0;
816 }
817
818 static const struct of_device_id mvsdio_dt_ids[] = {
819 { .compatible = "marvell,orion-sdio" },
820 { /* sentinel */ }
821 };
822 MODULE_DEVICE_TABLE(of, mvsdio_dt_ids);
823
824 static struct platform_driver mvsd_driver = {
825 .probe = mvsd_probe,
826 .remove = mvsd_remove,
827 .driver = {
828 .name = DRIVER_NAME,
829 .of_match_table = mvsdio_dt_ids,
830 },
831 };
832
833 module_platform_driver(mvsd_driver);
834
835 /* maximum card clock frequency (default 50MHz) */
836 module_param(maxfreq, int, 0);
837
838 /* force PIO transfers all the time */
839 module_param(nodma, int, 0);
840
841 MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
842 MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
843 MODULE_LICENSE("GPL");
844 MODULE_ALIAS("platform:mvsdio");
Linux with added FPC-III support