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vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console
[linux/fpc-iii.git] / drivers / mmc / host / mvsdio.c
blobe22bbff89c8d24c62d075327de4b65935a345162
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
129 host->sg_frags = dma_map_sg(mmc_dev(host->mmc),
130 data->sg, data->sg_len,
131 mmc_get_dma_dir(data));
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 unsigned int timeout;
147
148 BUG_ON(host->mrq != NULL);
149 host->mrq = mrq;
150
151 dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
152 cmd->opcode, mvsd_read(MVSD_HW_STATE));
153
154 cmdreg = MVSD_CMD_INDEX(cmd->opcode);
155
156 if (cmd->flags & MMC_RSP_BUSY)
157 cmdreg |= MVSD_CMD_RSP_48BUSY;
158 else if (cmd->flags & MMC_RSP_136)
159 cmdreg |= MVSD_CMD_RSP_136;
160 else if (cmd->flags & MMC_RSP_PRESENT)
161 cmdreg |= MVSD_CMD_RSP_48;
162 else
163 cmdreg |= MVSD_CMD_RSP_NONE;
164
165 if (cmd->flags & MMC_RSP_CRC)
166 cmdreg |= MVSD_CMD_CHECK_CMDCRC;
167
168 if (cmd->flags & MMC_RSP_OPCODE)
169 cmdreg |= MVSD_CMD_INDX_CHECK;
170
171 if (cmd->flags & MMC_RSP_PRESENT) {
172 cmdreg |= MVSD_UNEXPECTED_RESP;
173 intr |= MVSD_NOR_UNEXP_RSP;
174 }
175
176 if (mrq->data) {
177 struct mmc_data *data = mrq->data;
178 int pio;
179
180 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
181 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
182 if (data->flags & MMC_DATA_READ)
183 xfer |= MVSD_XFER_MODE_TO_HOST;
184
185 pio = mvsd_setup_data(host, data);
186 if (pio) {
187 xfer |= MVSD_XFER_MODE_PIO;
188 /* PIO section of mvsd_irq has comments on those bits */
189 if (data->flags & MMC_DATA_WRITE)
190 intr |= MVSD_NOR_TX_AVAIL;
191 else if (host->pio_size > 32)
192 intr |= MVSD_NOR_RX_FIFO_8W;
193 else
194 intr |= MVSD_NOR_RX_READY;
195 }
196
197 if (data->stop) {
198 struct mmc_command *stop = data->stop;
199 u32 cmd12reg = 0;
200
201 mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
202 mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
203
204 if (stop->flags & MMC_RSP_BUSY)
205 cmd12reg |= MVSD_AUTOCMD12_BUSY;
206 if (stop->flags & MMC_RSP_OPCODE)
207 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
208 cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
209 mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
210
211 xfer |= MVSD_XFER_MODE_AUTO_CMD12;
212 intr |= MVSD_NOR_AUTOCMD12_DONE;
213 } else {
214 intr |= MVSD_NOR_XFER_DONE;
215 }
216 } else {
217 intr |= MVSD_NOR_CMD_DONE;
218 }
219
220 mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
221 mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
222
223 spin_lock_irqsave(&host->lock, flags);
224
225 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
226 host->xfer_mode |= xfer;
227 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
228
229 mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
230 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
231 mvsd_write(MVSD_CMD, cmdreg);
232
233 host->intr_en &= MVSD_NOR_CARD_INT;
234 host->intr_en |= intr | MVSD_NOR_ERROR;
235 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
236 mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
237
238 timeout = cmd->busy_timeout ? cmd->busy_timeout : 5000;
239 mod_timer(&host->timer, jiffies + msecs_to_jiffies(timeout));
240
241 spin_unlock_irqrestore(&host->lock, flags);
242 }
243
244 static u32 mvsd_finish_cmd(struct mvsd_host *host, struct mmc_command *cmd,
245 u32 err_status)
246 {
247 void __iomem *iobase = host->base;
248
249 if (cmd->flags & MMC_RSP_136) {
250 unsigned int response[8], i;
251 for (i = 0; i < 8; i++)
252 response[i] = mvsd_read(MVSD_RSP(i));
253 cmd->resp[0] = ((response[0] & 0x03ff) << 22) |
254 ((response[1] & 0xffff) << 6) |
255 ((response[2] & 0xfc00) >> 10);
256 cmd->resp[1] = ((response[2] & 0x03ff) << 22) |
257 ((response[3] & 0xffff) << 6) |
258 ((response[4] & 0xfc00) >> 10);
259 cmd->resp[2] = ((response[4] & 0x03ff) << 22) |
260 ((response[5] & 0xffff) << 6) |
261 ((response[6] & 0xfc00) >> 10);
262 cmd->resp[3] = ((response[6] & 0x03ff) << 22) |
263 ((response[7] & 0x3fff) << 8);
264 } else if (cmd->flags & MMC_RSP_PRESENT) {
265 unsigned int response[3], i;
266 for (i = 0; i < 3; i++)
267 response[i] = mvsd_read(MVSD_RSP(i));
268 cmd->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
269 ((response[1] & 0xffff) << (14 - 8)) |
270 ((response[0] & 0x03ff) << (30 - 8));
271 cmd->resp[1] = ((response[0] & 0xfc00) >> 10);
272 cmd->resp[2] = 0;
273 cmd->resp[3] = 0;
274 }
275
276 if (err_status & MVSD_ERR_CMD_TIMEOUT) {
277 cmd->error = -ETIMEDOUT;
278 } else if (err_status & (MVSD_ERR_CMD_CRC | MVSD_ERR_CMD_ENDBIT |
279 MVSD_ERR_CMD_INDEX | MVSD_ERR_CMD_STARTBIT)) {
280 cmd->error = -EILSEQ;
281 }
282 err_status &= ~(MVSD_ERR_CMD_TIMEOUT | MVSD_ERR_CMD_CRC |
283 MVSD_ERR_CMD_ENDBIT | MVSD_ERR_CMD_INDEX |
284 MVSD_ERR_CMD_STARTBIT);
285
286 return err_status;
287 }
288
289 static u32 mvsd_finish_data(struct mvsd_host *host, struct mmc_data *data,
290 u32 err_status)
291 {
292 void __iomem *iobase = host->base;
293
294 if (host->pio_ptr) {
295 host->pio_ptr = NULL;
296 host->pio_size = 0;
297 } else {
298 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_frags,
299 mmc_get_dma_dir(data));
300 }
301
302 if (err_status & MVSD_ERR_DATA_TIMEOUT)
303 data->error = -ETIMEDOUT;
304 else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
305 data->error = -EILSEQ;
306 else if (err_status & MVSD_ERR_XFER_SIZE)
307 data->error = -EBADE;
308 err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
309 MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
310
311 dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
312 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
313 data->bytes_xfered =
314 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
315 /* We can't be sure about the last block when errors are detected */
316 if (data->bytes_xfered && data->error)
317 data->bytes_xfered -= data->blksz;
318
319 /* Handle Auto cmd 12 response */
320 if (data->stop) {
321 unsigned int response[3], i;
322 for (i = 0; i < 3; i++)
323 response[i] = mvsd_read(MVSD_AUTO_RSP(i));
324 data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
325 ((response[1] & 0xffff) << (14 - 8)) |
326 ((response[0] & 0x03ff) << (30 - 8));
327 data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
328 data->stop->resp[2] = 0;
329 data->stop->resp[3] = 0;
330
331 if (err_status & MVSD_ERR_AUTOCMD12) {
332 u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
333 dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
334 if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
335 data->stop->error = -ENOEXEC;
336 else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
337 data->stop->error = -ETIMEDOUT;
338 else if (err_cmd12)
339 data->stop->error = -EILSEQ;
340 err_status &= ~MVSD_ERR_AUTOCMD12;
341 }
342 }
343
344 return err_status;
345 }
346
347 static irqreturn_t mvsd_irq(int irq, void *dev)
348 {
349 struct mvsd_host *host = dev;
350 void __iomem *iobase = host->base;
351 u32 intr_status, intr_done_mask;
352 int irq_handled = 0;
353
354 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
355 dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
356 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
357 mvsd_read(MVSD_HW_STATE));
358
359 /*
360 * It looks like, SDIO IP can issue one late, spurious irq
361 * although all irqs should be disabled. To work around this,
362 * bail out early, if we didn't expect any irqs to occur.
363 */
364 if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) {
365 dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n",
366 mvsd_read(MVSD_NOR_INTR_STATUS),
367 mvsd_read(MVSD_NOR_INTR_EN),
368 mvsd_read(MVSD_ERR_INTR_STATUS),
369 mvsd_read(MVSD_ERR_INTR_EN));
370 return IRQ_HANDLED;
371 }
372
373 spin_lock(&host->lock);
374
375 /* PIO handling, if needed. Messy business... */
376 if (host->pio_size &&
377 (intr_status & host->intr_en &
378 (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
379 u16 *p = host->pio_ptr;
380 int s = host->pio_size;
381 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
382 readsw(iobase + MVSD_FIFO, p, 16);
383 p += 16;
384 s -= 32;
385 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
386 }
387 /*
388 * Normally we'd use < 32 here, but the RX_FIFO_8W bit
389 * doesn't appear to assert when there is exactly 32 bytes
390 * (8 words) left to fetch in a transfer.
391 */
392 if (s <= 32) {
393 while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
394 put_unaligned(mvsd_read(MVSD_FIFO), p++);
395 put_unaligned(mvsd_read(MVSD_FIFO), p++);
396 s -= 4;
397 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
398 }
399 if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
400 u16 val[2] = {0, 0};
401 val[0] = mvsd_read(MVSD_FIFO);
402 val[1] = mvsd_read(MVSD_FIFO);
403 memcpy(p, ((void *)&val) + 4 - s, s);
404 s = 0;
405 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
406 }
407 if (s == 0) {
408 host->intr_en &=
409 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
410 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
411 } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
412 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
413 host->intr_en |= MVSD_NOR_RX_READY;
414 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
415 }
416 }
417 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
418 s, intr_status, mvsd_read(MVSD_HW_STATE));
419 host->pio_ptr = p;
420 host->pio_size = s;
421 irq_handled = 1;
422 } else if (host->pio_size &&
423 (intr_status & host->intr_en &
424 (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
425 u16 *p = host->pio_ptr;
426 int s = host->pio_size;
427 /*
428 * The TX_FIFO_8W bit is unreliable. When set, bursting
429 * 16 halfwords all at once in the FIFO drops data. Actually
430 * TX_AVAIL does go off after only one word is pushed even if
431 * TX_FIFO_8W remains set.
432 */
433 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
434 mvsd_write(MVSD_FIFO, get_unaligned(p++));
435 mvsd_write(MVSD_FIFO, get_unaligned(p++));
436 s -= 4;
437 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
438 }
439 if (s < 4) {
440 if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
441 u16 val[2] = {0, 0};
442 memcpy(((void *)&val) + 4 - s, p, s);
443 mvsd_write(MVSD_FIFO, val[0]);
444 mvsd_write(MVSD_FIFO, val[1]);
445 s = 0;
446 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
447 }
448 if (s == 0) {
449 host->intr_en &=
450 ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
451 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
452 }
453 }
454 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
455 s, intr_status, mvsd_read(MVSD_HW_STATE));
456 host->pio_ptr = p;
457 host->pio_size = s;
458 irq_handled = 1;
459 }
460
461 mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
462
463 intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
464 MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
465 if (intr_status & host->intr_en & ~intr_done_mask) {
466 struct mmc_request *mrq = host->mrq;
467 struct mmc_command *cmd = mrq->cmd;
468 u32 err_status = 0;
469
470 del_timer(&host->timer);
471 host->mrq = NULL;
472
473 host->intr_en &= MVSD_NOR_CARD_INT;
474 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
475 mvsd_write(MVSD_ERR_INTR_EN, 0);
476
477 spin_unlock(&host->lock);
478
479 if (intr_status & MVSD_NOR_UNEXP_RSP) {
480 cmd->error = -EPROTO;
481 } else if (intr_status & MVSD_NOR_ERROR) {
482 err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
483 dev_dbg(host->dev, "err 0x%04x\n", err_status);
484 }
485
486 err_status = mvsd_finish_cmd(host, cmd, err_status);
487 if (mrq->data)
488 err_status = mvsd_finish_data(host, mrq->data, err_status);
489 if (err_status) {
490 dev_err(host->dev, "unhandled error status %#04x\n",
491 err_status);
492 cmd->error = -ENOMSG;
493 }
494
495 mmc_request_done(host->mmc, mrq);
496 irq_handled = 1;
497 } else
498 spin_unlock(&host->lock);
499
500 if (intr_status & MVSD_NOR_CARD_INT) {
501 mmc_signal_sdio_irq(host->mmc);
502 irq_handled = 1;
503 }
504
505 if (irq_handled)
506 return IRQ_HANDLED;
507
508 dev_err(host->dev, "unhandled interrupt status=0x%04x en=0x%04x pio=%d\n",
509 intr_status, host->intr_en, host->pio_size);
510 return IRQ_NONE;
511 }
512
513 static void mvsd_timeout_timer(struct timer_list *t)
514 {
515 struct mvsd_host *host = from_timer(host, t, timer);
516 void __iomem *iobase = host->base;
517 struct mmc_request *mrq;
518 unsigned long flags;
519
520 spin_lock_irqsave(&host->lock, flags);
521 mrq = host->mrq;
522 if (mrq) {
523 dev_err(host->dev, "Timeout waiting for hardware interrupt.\n");
524 dev_err(host->dev, "hw_state=0x%04x, intr_status=0x%04x intr_en=0x%04x\n",
525 mvsd_read(MVSD_HW_STATE),
526 mvsd_read(MVSD_NOR_INTR_STATUS),
527 mvsd_read(MVSD_NOR_INTR_EN));
528
529 host->mrq = NULL;
530
531 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
532
533 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
534 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
535
536 host->intr_en &= MVSD_NOR_CARD_INT;
537 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
538 mvsd_write(MVSD_ERR_INTR_EN, 0);
539 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
540
541 mrq->cmd->error = -ETIMEDOUT;
542 mvsd_finish_cmd(host, mrq->cmd, 0);
543 if (mrq->data) {
544 mrq->data->error = -ETIMEDOUT;
545 mvsd_finish_data(host, mrq->data, 0);
546 }
547 }
548 spin_unlock_irqrestore(&host->lock, flags);
549
550 if (mrq)
551 mmc_request_done(host->mmc, mrq);
552 }
553
554 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
555 {
556 struct mvsd_host *host = mmc_priv(mmc);
557 void __iomem *iobase = host->base;
558 unsigned long flags;
559
560 spin_lock_irqsave(&host->lock, flags);
561 if (enable) {
562 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
563 host->intr_en |= MVSD_NOR_CARD_INT;
564 } else {
565 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
566 host->intr_en &= ~MVSD_NOR_CARD_INT;
567 }
568 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
569 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
570 spin_unlock_irqrestore(&host->lock, flags);
571 }
572
573 static void mvsd_power_up(struct mvsd_host *host)
574 {
575 void __iomem *iobase = host->base;
576 dev_dbg(host->dev, "power up\n");
577 mvsd_write(MVSD_NOR_INTR_EN, 0);
578 mvsd_write(MVSD_ERR_INTR_EN, 0);
579 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
580 mvsd_write(MVSD_XFER_MODE, 0);
581 mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
582 mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
583 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
584 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
585 }
586
587 static void mvsd_power_down(struct mvsd_host *host)
588 {
589 void __iomem *iobase = host->base;
590 dev_dbg(host->dev, "power down\n");
591 mvsd_write(MVSD_NOR_INTR_EN, 0);
592 mvsd_write(MVSD_ERR_INTR_EN, 0);
593 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
594 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
595 mvsd_write(MVSD_NOR_STATUS_EN, 0);
596 mvsd_write(MVSD_ERR_STATUS_EN, 0);
597 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
598 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
599 }
600
601 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
602 {
603 struct mvsd_host *host = mmc_priv(mmc);
604 void __iomem *iobase = host->base;
605 u32 ctrl_reg = 0;
606
607 if (ios->power_mode == MMC_POWER_UP)
608 mvsd_power_up(host);
609
610 if (ios->clock == 0) {
611 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
612 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
613 host->clock = 0;
614 dev_dbg(host->dev, "clock off\n");
615 } else if (ios->clock != host->clock) {
616 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
617 if (m > MVSD_BASE_DIV_MAX)
618 m = MVSD_BASE_DIV_MAX;
619 mvsd_write(MVSD_CLK_DIV, m);
620 host->clock = ios->clock;
621 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
622 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
623 ios->clock, host->base_clock / (m+1), m);
624 }
625
626 /* default transfer mode */
627 ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
628 ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
629
630 /* default to maximum timeout */
631 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
632 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
633
634 if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
635 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
636
637 if (ios->bus_width == MMC_BUS_WIDTH_4)
638 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
639
640 /*
641 * The HI_SPEED_EN bit is causing trouble with many (but not all)
642 * high speed SD, SDHC and SDIO cards. Not enabling that bit
643 * makes all cards work. So let's just ignore that bit for now
644 * and revisit this issue if problems for not enabling this bit
645 * are ever reported.
646 */
647 #if 0
648 if (ios->timing == MMC_TIMING_MMC_HS ||
649 ios->timing == MMC_TIMING_SD_HS)
650 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
651 #endif
652
653 host->ctrl = ctrl_reg;
654 mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
655 dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
656 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
657 "push-pull" : "open-drain",
658 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
659 "4bit-width" : "1bit-width",
660 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
661 "high-speed" : "");
662
663 if (ios->power_mode == MMC_POWER_OFF)
664 mvsd_power_down(host);
665 }
666
667 static const struct mmc_host_ops mvsd_ops = {
668 .request = mvsd_request,
669 .get_ro = mmc_gpio_get_ro,
670 .set_ios = mvsd_set_ios,
671 .enable_sdio_irq = mvsd_enable_sdio_irq,
672 };
673
674 static void
675 mv_conf_mbus_windows(struct mvsd_host *host,
676 const struct mbus_dram_target_info *dram)
677 {
678 void __iomem *iobase = host->base;
679 int i;
680
681 for (i = 0; i < 4; i++) {
682 writel(0, iobase + MVSD_WINDOW_CTRL(i));
683 writel(0, iobase + MVSD_WINDOW_BASE(i));
684 }
685
686 for (i = 0; i < dram->num_cs; i++) {
687 const struct mbus_dram_window *cs = dram->cs + i;
688 writel(((cs->size - 1) & 0xffff0000) |
689 (cs->mbus_attr << 8) |
690 (dram->mbus_dram_target_id << 4) | 1,
691 iobase + MVSD_WINDOW_CTRL(i));
692 writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
693 }
694 }
695
696 static int mvsd_probe(struct platform_device *pdev)
697 {
698 struct device_node *np = pdev->dev.of_node;
699 struct mmc_host *mmc = NULL;
700 struct mvsd_host *host = NULL;
701 const struct mbus_dram_target_info *dram;
702 struct resource *r;
703 int ret, irq;
704
705 if (!np) {
706 dev_err(&pdev->dev, "no DT node\n");
707 return -ENODEV;
708 }
709 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
710 irq = platform_get_irq(pdev, 0);
711 if (!r || irq < 0)
712 return -ENXIO;
713
714 mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
715 if (!mmc) {
716 ret = -ENOMEM;
717 goto out;
718 }
719
720 host = mmc_priv(mmc);
721 host->mmc = mmc;
722 host->dev = &pdev->dev;
723
724 /*
725 * Some non-DT platforms do not pass a clock, and the clock
726 * frequency is passed through platform_data. On DT platforms,
727 * a clock must always be passed, even if there is no gatable
728 * clock associated to the SDIO interface (it can simply be a
729 * fixed rate clock).
730 */
731 host->clk = devm_clk_get(&pdev->dev, NULL);
732 if (IS_ERR(host->clk)) {
733 dev_err(&pdev->dev, "no clock associated\n");
734 ret = -EINVAL;
735 goto out;
736 }
737 clk_prepare_enable(host->clk);
738
739 mmc->ops = &mvsd_ops;
740
741 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
742
743 mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
744 mmc->f_max = MVSD_CLOCKRATE_MAX;
745
746 mmc->max_blk_size = 2048;
747 mmc->max_blk_count = 65535;
748
749 mmc->max_segs = 1;
750 mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
751 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
752
753 host->base_clock = clk_get_rate(host->clk) / 2;
754 ret = mmc_of_parse(mmc);
755 if (ret < 0)
756 goto out;
757 if (maxfreq)
758 mmc->f_max = maxfreq;
759
760 mmc->caps |= MMC_CAP_ERASE;
761
762 spin_lock_init(&host->lock);
763
764 host->base = devm_ioremap_resource(&pdev->dev, r);
765 if (IS_ERR(host->base)) {
766 ret = PTR_ERR(host->base);
767 goto out;
768 }
769
770 /* (Re-)program MBUS remapping windows if we are asked to. */
771 dram = mv_mbus_dram_info();
772 if (dram)
773 mv_conf_mbus_windows(host, dram);
774
775 mvsd_power_down(host);
776
777 ret = devm_request_irq(&pdev->dev, irq, mvsd_irq, 0, DRIVER_NAME, host);
778 if (ret) {
779 dev_err(&pdev->dev, "cannot assign irq %d\n", irq);
780 goto out;
781 }
782
783 timer_setup(&host->timer, mvsd_timeout_timer, 0);
784 platform_set_drvdata(pdev, mmc);
785 ret = mmc_add_host(mmc);
786 if (ret)
787 goto out;
788
789 if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
790 dev_dbg(&pdev->dev, "using GPIO for card detection\n");
791 else
792 dev_dbg(&pdev->dev, "lacking card detect (fall back to polling)\n");
793
794 return 0;
795
796 out:
797 if (mmc) {
798 if (!IS_ERR(host->clk))
799 clk_disable_unprepare(host->clk);
800 mmc_free_host(mmc);
801 }
802
803 return ret;
804 }
805
806 static int mvsd_remove(struct platform_device *pdev)
807 {
808 struct mmc_host *mmc = platform_get_drvdata(pdev);
809
810 struct mvsd_host *host = mmc_priv(mmc);
811
812 mmc_remove_host(mmc);
813 del_timer_sync(&host->timer);
814 mvsd_power_down(host);
815
816 if (!IS_ERR(host->clk))
817 clk_disable_unprepare(host->clk);
818 mmc_free_host(mmc);
819
820 return 0;
821 }
822
823 static const struct of_device_id mvsdio_dt_ids[] = {
824 { .compatible = "marvell,orion-sdio" },
825 { /* sentinel */ }
826 };
827 MODULE_DEVICE_TABLE(of, mvsdio_dt_ids);
828
829 static struct platform_driver mvsd_driver = {
830 .probe = mvsd_probe,
831 .remove = mvsd_remove,
832 .driver = {
833 .name = DRIVER_NAME,
834 .of_match_table = mvsdio_dt_ids,
835 },
836 };
837
838 module_platform_driver(mvsd_driver);
839
840 /* maximum card clock frequency (default 50MHz) */
841 module_param(maxfreq, int, 0);
842
843 /* force PIO transfers all the time */
844 module_param(nodma, int, 0);
845
846 MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
847 MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
848 MODULE_LICENSE("GPL");
849 MODULE_ALIAS("platform:mvsdio");
Linux with added FPC-III support