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code style scripts/checkpatch.pl (linux-3.9-rc1) formatting
[linux-2.6.32.60-moxart.git] / drivers / mmc / host / mvsdio.c
blob34e23489811ae74ea14594f1af1cb84f7a6e6b58
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/gpio.h>
23 #include <linux/mmc/host.h>
24
25 #include <asm/sizes.h>
26 #include <asm/unaligned.h>
27 #include <plat/mvsdio.h>
28
29 #include "mvsdio.h"
30
31 #define DRIVER_NAME "mvsdio"
32
33 static int maxfreq = MVSD_CLOCKRATE_MAX;
34 static int nodma;
35
36 struct mvsd_host {
37 void __iomem *base;
38 struct mmc_request *mrq;
39 spinlock_t lock;
40 unsigned int xfer_mode;
41 unsigned int intr_en;
42 unsigned int ctrl;
43 unsigned int pio_size;
44 void *pio_ptr;
45 unsigned int sg_frags;
46 unsigned int ns_per_clk;
47 unsigned int clock;
48 unsigned int base_clock;
49 struct timer_list timer;
50 struct mmc_host *mmc;
51 struct device *dev;
52 struct resource *res;
53 int irq;
54 int gpio_card_detect;
55 int gpio_write_protect;
56 };
57
58 #define mvsd_write(offs, val) writel(val, iobase + (offs))
59 #define mvsd_read(offs) readl(iobase + (offs))
60
61 static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
62 {
63 void __iomem *iobase = host->base;
64 unsigned int tmout;
65 int tmout_index;
66
67 /*
68 * Hardware weirdness. The FIFO_EMPTY bit of the HW_STATE
69 * register is sometimes not set before a while when some
70 * "unusual" data block sizes are used (such as with the SWITCH
71 * command), even despite the fact that the XFER_DONE interrupt
72 * was raised. And if another data transfer starts before
73 * this bit comes to good sense (which eventually happens by
74 * itself) then the new transfer simply fails with a timeout.
75 */
76 if (!(mvsd_read(MVSD_HW_STATE) & (1 << 13))) {
77 unsigned long t = jiffies + HZ;
78 unsigned int hw_state, count = 0;
79 do {
80 if (time_after(jiffies, t)) {
81 dev_warn(host->dev, "FIFO_EMPTY bit missing\n");
82 break;
83 }
84 hw_state = mvsd_read(MVSD_HW_STATE);
85 count++;
86 } while (!(hw_state & (1 << 13)));
87 dev_dbg(host->dev, "*** wait for FIFO_EMPTY bit "
88 "(hw=0x%04x, count=%d, jiffies=%ld)\n",
89 hw_state, count, jiffies - (t - HZ));
90 }
91
92 /* If timeout=0 then maximum timeout index is used. */
93 tmout = DIV_ROUND_UP(data->timeout_ns, host->ns_per_clk);
94 tmout += data->timeout_clks;
95 tmout_index = fls(tmout - 1) - 12;
96 if (tmout_index < 0)
97 tmout_index = 0;
98 if (tmout_index > MVSD_HOST_CTRL_TMOUT_MAX)
99 tmout_index = MVSD_HOST_CTRL_TMOUT_MAX;
100
101 dev_dbg(host->dev, "data %s at 0x%08x: blocks=%d blksz=%d tmout=%u (%d)\n",
102 (data->flags & MMC_DATA_READ) ? "read" : "write",
103 (u32)sg_virt(data->sg), data->blocks, data->blksz,
104 tmout, tmout_index);
105
106 host->ctrl &= ~MVSD_HOST_CTRL_TMOUT_MASK;
107 host->ctrl |= MVSD_HOST_CTRL_TMOUT(tmout_index);
108 mvsd_write(MVSD_HOST_CTRL, host->ctrl);
109 mvsd_write(MVSD_BLK_COUNT, data->blocks);
110 mvsd_write(MVSD_BLK_SIZE, data->blksz);
111
112 if (nodma || (data->blksz | data->sg->offset) & 3) {
113 /*
114 * We cannot do DMA on a buffer which offset or size
115 * is not aligned on a 4-byte boundary.
116 */
117 host->pio_size = data->blocks * data->blksz;
118 host->pio_ptr = sg_virt(data->sg);
119 if (!nodma)
120 printk(KERN_DEBUG "%s: fallback to PIO for data "
121 "at 0x%p size %d\n",
122 mmc_hostname(host->mmc),
123 host->pio_ptr, host->pio_size);
124 return 1;
125 } else {
126 dma_addr_t phys_addr;
127 int dma_dir = (data->flags & MMC_DATA_READ) ?
128 DMA_FROM_DEVICE : DMA_TO_DEVICE;
129 host->sg_frags = dma_map_sg(mmc_dev(host->mmc), data->sg,
130 data->sg_len, dma_dir);
131 phys_addr = sg_dma_address(data->sg);
132 mvsd_write(MVSD_SYS_ADDR_LOW, (u32)phys_addr & 0xffff);
133 mvsd_write(MVSD_SYS_ADDR_HI, (u32)phys_addr >> 16);
134 return 0;
135 }
136 }
137
138 static void mvsd_request(struct mmc_host *mmc, struct mmc_request *mrq)
139 {
140 struct mvsd_host *host = mmc_priv(mmc);
141 void __iomem *iobase = host->base;
142 struct mmc_command *cmd = mrq->cmd;
143 u32 cmdreg = 0, xfer = 0, intr = 0;
144 unsigned long flags;
145
146 BUG_ON(host->mrq != NULL);
147 host->mrq = mrq;
148
149 dev_dbg(host->dev, "cmd %d (hw state 0x%04x)\n",
150 cmd->opcode, mvsd_read(MVSD_HW_STATE));
151
152 cmdreg = MVSD_CMD_INDEX(cmd->opcode);
153
154 if (cmd->flags & MMC_RSP_BUSY)
155 cmdreg |= MVSD_CMD_RSP_48BUSY;
156 else if (cmd->flags & MMC_RSP_136)
157 cmdreg |= MVSD_CMD_RSP_136;
158 else if (cmd->flags & MMC_RSP_PRESENT)
159 cmdreg |= MVSD_CMD_RSP_48;
160 else
161 cmdreg |= MVSD_CMD_RSP_NONE;
162
163 if (cmd->flags & MMC_RSP_CRC)
164 cmdreg |= MVSD_CMD_CHECK_CMDCRC;
165
166 if (cmd->flags & MMC_RSP_OPCODE)
167 cmdreg |= MVSD_CMD_INDX_CHECK;
168
169 if (cmd->flags & MMC_RSP_PRESENT) {
170 cmdreg |= MVSD_UNEXPECTED_RESP;
171 intr |= MVSD_NOR_UNEXP_RSP;
172 }
173
174 if (mrq->data) {
175 struct mmc_data *data = mrq->data;
176 int pio;
177
178 cmdreg |= MVSD_CMD_DATA_PRESENT | MVSD_CMD_CHECK_DATACRC16;
179 xfer |= MVSD_XFER_MODE_HW_WR_DATA_EN;
180 if (data->flags & MMC_DATA_READ)
181 xfer |= MVSD_XFER_MODE_TO_HOST;
182
183 pio = mvsd_setup_data(host, data);
184 if (pio) {
185 xfer |= MVSD_XFER_MODE_PIO;
186 /* PIO section of mvsd_irq has comments on those bits */
187 if (data->flags & MMC_DATA_WRITE)
188 intr |= MVSD_NOR_TX_AVAIL;
189 else if (host->pio_size > 32)
190 intr |= MVSD_NOR_RX_FIFO_8W;
191 else
192 intr |= MVSD_NOR_RX_READY;
193 }
194
195 if (data->stop) {
196 struct mmc_command *stop = data->stop;
197 u32 cmd12reg = 0;
198
199 mvsd_write(MVSD_AUTOCMD12_ARG_LOW, stop->arg & 0xffff);
200 mvsd_write(MVSD_AUTOCMD12_ARG_HI, stop->arg >> 16);
201
202 if (stop->flags & MMC_RSP_BUSY)
203 cmd12reg |= MVSD_AUTOCMD12_BUSY;
204 if (stop->flags & MMC_RSP_OPCODE)
205 cmd12reg |= MVSD_AUTOCMD12_INDX_CHECK;
206 cmd12reg |= MVSD_AUTOCMD12_INDEX(stop->opcode);
207 mvsd_write(MVSD_AUTOCMD12_CMD, cmd12reg);
208
209 xfer |= MVSD_XFER_MODE_AUTO_CMD12;
210 intr |= MVSD_NOR_AUTOCMD12_DONE;
211 } else {
212 intr |= MVSD_NOR_XFER_DONE;
213 }
214 } else {
215 intr |= MVSD_NOR_CMD_DONE;
216 }
217
218 mvsd_write(MVSD_ARG_LOW, cmd->arg & 0xffff);
219 mvsd_write(MVSD_ARG_HI, cmd->arg >> 16);
220
221 spin_lock_irqsave(&host->lock, flags);
222
223 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
224 host->xfer_mode |= xfer;
225 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
226
227 mvsd_write(MVSD_NOR_INTR_STATUS, ~MVSD_NOR_CARD_INT);
228 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
229 mvsd_write(MVSD_CMD, cmdreg);
230
231 host->intr_en &= MVSD_NOR_CARD_INT;
232 host->intr_en |= intr | MVSD_NOR_ERROR;
233 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
234 mvsd_write(MVSD_ERR_INTR_EN, 0xffff);
235
236 mod_timer(&host->timer, jiffies + 5 * HZ);
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 (data->flags & MMC_DATA_READ) ?
297 DMA_FROM_DEVICE : DMA_TO_DEVICE);
298 }
299
300 if (err_status & MVSD_ERR_DATA_TIMEOUT)
301 data->error = -ETIMEDOUT;
302 else if (err_status & (MVSD_ERR_DATA_CRC | MVSD_ERR_DATA_ENDBIT))
303 data->error = -EILSEQ;
304 else if (err_status & MVSD_ERR_XFER_SIZE)
305 data->error = -EBADE;
306 err_status &= ~(MVSD_ERR_DATA_TIMEOUT | MVSD_ERR_DATA_CRC |
307 MVSD_ERR_DATA_ENDBIT | MVSD_ERR_XFER_SIZE);
308
309 dev_dbg(host->dev, "data done: blocks_left=%d, bytes_left=%d\n",
310 mvsd_read(MVSD_CURR_BLK_LEFT), mvsd_read(MVSD_CURR_BYTE_LEFT));
311 data->bytes_xfered =
312 (data->blocks - mvsd_read(MVSD_CURR_BLK_LEFT)) * data->blksz;
313 /* We can't be sure about the last block when errors are detected */
314 if (data->bytes_xfered && data->error)
315 data->bytes_xfered -= data->blksz;
316
317 /* Handle Auto cmd 12 response */
318 if (data->stop) {
319 unsigned int response[3], i;
320 for (i = 0; i < 3; i++)
321 response[i] = mvsd_read(MVSD_AUTO_RSP(i));
322 data->stop->resp[0] = ((response[2] & 0x003f) << (8 - 8)) |
323 ((response[1] & 0xffff) << (14 - 8)) |
324 ((response[0] & 0x03ff) << (30 - 8));
325 data->stop->resp[1] = ((response[0] & 0xfc00) >> 10);
326 data->stop->resp[2] = 0;
327 data->stop->resp[3] = 0;
328
329 if (err_status & MVSD_ERR_AUTOCMD12) {
330 u32 err_cmd12 = mvsd_read(MVSD_AUTOCMD12_ERR_STATUS);
331 dev_dbg(host->dev, "c12err 0x%04x\n", err_cmd12);
332 if (err_cmd12 & MVSD_AUTOCMD12_ERR_NOTEXE)
333 data->stop->error = -ENOEXEC;
334 else if (err_cmd12 & MVSD_AUTOCMD12_ERR_TIMEOUT)
335 data->stop->error = -ETIMEDOUT;
336 else if (err_cmd12)
337 data->stop->error = -EILSEQ;
338 err_status &= ~MVSD_ERR_AUTOCMD12;
339 }
340 }
341
342 return err_status;
343 }
344
345 static irqreturn_t mvsd_irq(int irq, void *dev)
346 {
347 struct mvsd_host *host = dev;
348 void __iomem *iobase = host->base;
349 u32 intr_status, intr_done_mask;
350 int irq_handled = 0;
351
352 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
353 dev_dbg(host->dev, "intr 0x%04x intr_en 0x%04x hw_state 0x%04x\n",
354 intr_status, mvsd_read(MVSD_NOR_INTR_EN),
355 mvsd_read(MVSD_HW_STATE));
356
357 spin_lock(&host->lock);
358
359 /* PIO handling, if needed. Messy business... */
360 if (host->pio_size &&
361 (intr_status & host->intr_en &
362 (MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W))) {
363 u16 *p = host->pio_ptr;
364 int s = host->pio_size;
365 while (s >= 32 && (intr_status & MVSD_NOR_RX_FIFO_8W)) {
366 readsw(iobase + MVSD_FIFO, p, 16);
367 p += 16;
368 s -= 32;
369 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
370 }
371 /*
372 * Normally we'd use < 32 here, but the RX_FIFO_8W bit
373 * doesn't appear to assert when there is exactly 32 bytes
374 * (8 words) left to fetch in a transfer.
375 */
376 if (s <= 32) {
377 while (s >= 4 && (intr_status & MVSD_NOR_RX_READY)) {
378 put_unaligned(mvsd_read(MVSD_FIFO), p++);
379 put_unaligned(mvsd_read(MVSD_FIFO), p++);
380 s -= 4;
381 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
382 }
383 if (s && s < 4 && (intr_status & MVSD_NOR_RX_READY)) {
384 u16 val[2] = {0, 0};
385 val[0] = mvsd_read(MVSD_FIFO);
386 val[1] = mvsd_read(MVSD_FIFO);
387 memcpy(p, ((void *)&val) + 4 - s, s);
388 s = 0;
389 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
390 }
391 if (s == 0) {
392 host->intr_en &=
393 ~(MVSD_NOR_RX_READY | MVSD_NOR_RX_FIFO_8W);
394 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
395 } else if (host->intr_en & MVSD_NOR_RX_FIFO_8W) {
396 host->intr_en &= ~MVSD_NOR_RX_FIFO_8W;
397 host->intr_en |= MVSD_NOR_RX_READY;
398 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
399 }
400 }
401 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
402 s, intr_status, mvsd_read(MVSD_HW_STATE));
403 host->pio_ptr = p;
404 host->pio_size = s;
405 irq_handled = 1;
406 } else if (host->pio_size &&
407 (intr_status & host->intr_en &
408 (MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W))) {
409 u16 *p = host->pio_ptr;
410 int s = host->pio_size;
411 /*
412 * The TX_FIFO_8W bit is unreliable. When set, bursting
413 * 16 halfwords all at once in the FIFO drops data. Actually
414 * TX_AVAIL does go off after only one word is pushed even if
415 * TX_FIFO_8W remains set.
416 */
417 while (s >= 4 && (intr_status & MVSD_NOR_TX_AVAIL)) {
418 mvsd_write(MVSD_FIFO, get_unaligned(p++));
419 mvsd_write(MVSD_FIFO, get_unaligned(p++));
420 s -= 4;
421 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
422 }
423 if (s < 4) {
424 if (s && (intr_status & MVSD_NOR_TX_AVAIL)) {
425 u16 val[2] = {0, 0};
426 memcpy(((void *)&val) + 4 - s, p, s);
427 mvsd_write(MVSD_FIFO, val[0]);
428 mvsd_write(MVSD_FIFO, val[1]);
429 s = 0;
430 intr_status = mvsd_read(MVSD_NOR_INTR_STATUS);
431 }
432 if (s == 0) {
433 host->intr_en &=
434 ~(MVSD_NOR_TX_AVAIL | MVSD_NOR_TX_FIFO_8W);
435 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
436 }
437 }
438 dev_dbg(host->dev, "pio %d intr 0x%04x hw_state 0x%04x\n",
439 s, intr_status, mvsd_read(MVSD_HW_STATE));
440 host->pio_ptr = p;
441 host->pio_size = s;
442 irq_handled = 1;
443 }
444
445 mvsd_write(MVSD_NOR_INTR_STATUS, intr_status);
446
447 intr_done_mask = MVSD_NOR_CARD_INT | MVSD_NOR_RX_READY |
448 MVSD_NOR_RX_FIFO_8W | MVSD_NOR_TX_FIFO_8W;
449 if (intr_status & host->intr_en & ~intr_done_mask) {
450 struct mmc_request *mrq = host->mrq;
451 struct mmc_command *cmd = mrq->cmd;
452 u32 err_status = 0;
453
454 del_timer(&host->timer);
455 host->mrq = NULL;
456
457 host->intr_en &= MVSD_NOR_CARD_INT;
458 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
459 mvsd_write(MVSD_ERR_INTR_EN, 0);
460
461 spin_unlock(&host->lock);
462
463 if (intr_status & MVSD_NOR_UNEXP_RSP) {
464 cmd->error = -EPROTO;
465 } else if (intr_status & MVSD_NOR_ERROR) {
466 err_status = mvsd_read(MVSD_ERR_INTR_STATUS);
467 dev_dbg(host->dev, "err 0x%04x\n", err_status);
468 }
469
470 err_status = mvsd_finish_cmd(host, cmd, err_status);
471 if (mrq->data)
472 err_status = mvsd_finish_data(host, mrq->data, err_status);
473 if (err_status) {
474 printk(KERN_ERR "%s: unhandled error status %#04x\n",
475 mmc_hostname(host->mmc), err_status);
476 cmd->error = -ENOMSG;
477 }
478
479 mmc_request_done(host->mmc, mrq);
480 irq_handled = 1;
481 } else
482 spin_unlock(&host->lock);
483
484 if (intr_status & MVSD_NOR_CARD_INT) {
485 mmc_signal_sdio_irq(host->mmc);
486 irq_handled = 1;
487 }
488
489 if (irq_handled)
490 return IRQ_HANDLED;
491
492 printk(KERN_ERR "%s: unhandled interrupt status=0x%04x en=0x%04x "
493 "pio=%d\n", mmc_hostname(host->mmc), intr_status,
494 host->intr_en, host->pio_size);
495 return IRQ_NONE;
496 }
497
498 static void mvsd_timeout_timer(unsigned long data)
499 {
500 struct mvsd_host *host = (struct mvsd_host *)data;
501 void __iomem *iobase = host->base;
502 struct mmc_request *mrq;
503 unsigned long flags;
504
505 spin_lock_irqsave(&host->lock, flags);
506 mrq = host->mrq;
507 if (mrq) {
508 printk(KERN_ERR "%s: Timeout waiting for hardware interrupt.\n",
509 mmc_hostname(host->mmc));
510 printk(KERN_ERR "%s: hw_state=0x%04x, intr_status=0x%04x "
511 "intr_en=0x%04x\n", mmc_hostname(host->mmc),
512 mvsd_read(MVSD_HW_STATE),
513 mvsd_read(MVSD_NOR_INTR_STATUS),
514 mvsd_read(MVSD_NOR_INTR_EN));
515
516 host->mrq = NULL;
517
518 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
519
520 host->xfer_mode &= MVSD_XFER_MODE_INT_CHK_EN;
521 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
522
523 host->intr_en &= MVSD_NOR_CARD_INT;
524 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
525 mvsd_write(MVSD_ERR_INTR_EN, 0);
526 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
527
528 mrq->cmd->error = -ETIMEDOUT;
529 mvsd_finish_cmd(host, mrq->cmd, 0);
530 if (mrq->data) {
531 mrq->data->error = -ETIMEDOUT;
532 mvsd_finish_data(host, mrq->data, 0);
533 }
534 }
535 spin_unlock_irqrestore(&host->lock, flags);
536
537 if (mrq)
538 mmc_request_done(host->mmc, mrq);
539 }
540
541 static irqreturn_t mvsd_card_detect_irq(int irq, void *dev)
542 {
543 struct mvsd_host *host = dev;
544 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
545 return IRQ_HANDLED;
546 }
547
548 static void mvsd_enable_sdio_irq(struct mmc_host *mmc, int enable)
549 {
550 struct mvsd_host *host = mmc_priv(mmc);
551 void __iomem *iobase = host->base;
552 unsigned long flags;
553
554 spin_lock_irqsave(&host->lock, flags);
555 if (enable) {
556 host->xfer_mode |= MVSD_XFER_MODE_INT_CHK_EN;
557 host->intr_en |= MVSD_NOR_CARD_INT;
558 } else {
559 host->xfer_mode &= ~MVSD_XFER_MODE_INT_CHK_EN;
560 host->intr_en &= ~MVSD_NOR_CARD_INT;
561 }
562 mvsd_write(MVSD_XFER_MODE, host->xfer_mode);
563 mvsd_write(MVSD_NOR_INTR_EN, host->intr_en);
564 spin_unlock_irqrestore(&host->lock, flags);
565 }
566
567 static int mvsd_get_ro(struct mmc_host *mmc)
568 {
569 struct mvsd_host *host = mmc_priv(mmc);
570
571 if (host->gpio_write_protect)
572 return gpio_get_value(host->gpio_write_protect);
573
574 /*
575 * Board doesn't support read only detection; let the mmc core
576 * decide what to do.
577 */
578 return -ENOSYS;
579 }
580
581 static void mvsd_power_up(struct mvsd_host *host)
582 {
583 void __iomem *iobase = host->base;
584 dev_dbg(host->dev, "power up\n");
585 mvsd_write(MVSD_NOR_INTR_EN, 0);
586 mvsd_write(MVSD_ERR_INTR_EN, 0);
587 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
588 mvsd_write(MVSD_XFER_MODE, 0);
589 mvsd_write(MVSD_NOR_STATUS_EN, 0xffff);
590 mvsd_write(MVSD_ERR_STATUS_EN, 0xffff);
591 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
592 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
593 }
594
595 static void mvsd_power_down(struct mvsd_host *host)
596 {
597 void __iomem *iobase = host->base;
598 dev_dbg(host->dev, "power down\n");
599 mvsd_write(MVSD_NOR_INTR_EN, 0);
600 mvsd_write(MVSD_ERR_INTR_EN, 0);
601 mvsd_write(MVSD_SW_RESET, MVSD_SW_RESET_NOW);
602 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
603 mvsd_write(MVSD_NOR_STATUS_EN, 0);
604 mvsd_write(MVSD_ERR_STATUS_EN, 0);
605 mvsd_write(MVSD_NOR_INTR_STATUS, 0xffff);
606 mvsd_write(MVSD_ERR_INTR_STATUS, 0xffff);
607 }
608
609 static void mvsd_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
610 {
611 struct mvsd_host *host = mmc_priv(mmc);
612 void __iomem *iobase = host->base;
613 u32 ctrl_reg = 0;
614
615 if (ios->power_mode == MMC_POWER_UP)
616 mvsd_power_up(host);
617
618 if (ios->clock == 0) {
619 mvsd_write(MVSD_XFER_MODE, MVSD_XFER_MODE_STOP_CLK);
620 mvsd_write(MVSD_CLK_DIV, MVSD_BASE_DIV_MAX);
621 host->clock = 0;
622 dev_dbg(host->dev, "clock off\n");
623 } else if (ios->clock != host->clock) {
624 u32 m = DIV_ROUND_UP(host->base_clock, ios->clock) - 1;
625 if (m > MVSD_BASE_DIV_MAX)
626 m = MVSD_BASE_DIV_MAX;
627 mvsd_write(MVSD_CLK_DIV, m);
628 host->clock = ios->clock;
629 host->ns_per_clk = 1000000000 / (host->base_clock / (m+1));
630 dev_dbg(host->dev, "clock=%d (%d), div=0x%04x\n",
631 ios->clock, host->base_clock / (m+1), m);
632 }
633
634 /* default transfer mode */
635 ctrl_reg |= MVSD_HOST_CTRL_BIG_ENDIAN;
636 ctrl_reg &= ~MVSD_HOST_CTRL_LSB_FIRST;
637
638 /* default to maximum timeout */
639 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_MASK;
640 ctrl_reg |= MVSD_HOST_CTRL_TMOUT_EN;
641
642 if (ios->bus_mode == MMC_BUSMODE_PUSHPULL)
643 ctrl_reg |= MVSD_HOST_CTRL_PUSH_PULL_EN;
644
645 if (ios->bus_width == MMC_BUS_WIDTH_4)
646 ctrl_reg |= MVSD_HOST_CTRL_DATA_WIDTH_4_BITS;
647
648 /*
649 * The HI_SPEED_EN bit is causing trouble with many (but not all)
650 * high speed SD, SDHC and SDIO cards. Not enabling that bit
651 * makes all cards work. So let's just ignore that bit for now
652 * and revisit this issue if problems for not enabling this bit
653 * are ever reported.
654 */
655 #if 0
656 if (ios->timing == MMC_TIMING_MMC_HS ||
657 ios->timing == MMC_TIMING_SD_HS)
658 ctrl_reg |= MVSD_HOST_CTRL_HI_SPEED_EN;
659 #endif
660
661 host->ctrl = ctrl_reg;
662 mvsd_write(MVSD_HOST_CTRL, ctrl_reg);
663 dev_dbg(host->dev, "ctrl 0x%04x: %s %s %s\n", ctrl_reg,
664 (ctrl_reg & MVSD_HOST_CTRL_PUSH_PULL_EN) ?
665 "push-pull" : "open-drain",
666 (ctrl_reg & MVSD_HOST_CTRL_DATA_WIDTH_4_BITS) ?
667 "4bit-width" : "1bit-width",
668 (ctrl_reg & MVSD_HOST_CTRL_HI_SPEED_EN) ?
669 "high-speed" : "");
670
671 if (ios->power_mode == MMC_POWER_OFF)
672 mvsd_power_down(host);
673 }
674
675 static const struct mmc_host_ops mvsd_ops = {
676 .request = mvsd_request,
677 .get_ro = mvsd_get_ro,
678 .set_ios = mvsd_set_ios,
679 .enable_sdio_irq = mvsd_enable_sdio_irq,
680 };
681
682 static void __init mv_conf_mbus_windows(struct mvsd_host *host,
683 struct mbus_dram_target_info *dram)
684 {
685 void __iomem *iobase = host->base;
686 int i;
687
688 for (i = 0; i < 4; i++) {
689 writel(0, iobase + MVSD_WINDOW_CTRL(i));
690 writel(0, iobase + MVSD_WINDOW_BASE(i));
691 }
692
693 for (i = 0; i < dram->num_cs; i++) {
694 struct mbus_dram_window *cs = dram->cs + i;
695 writel(((cs->size - 1) & 0xffff0000) |
696 (cs->mbus_attr << 8) |
697 (dram->mbus_dram_target_id << 4) | 1,
698 iobase + MVSD_WINDOW_CTRL(i));
699 writel(cs->base, iobase + MVSD_WINDOW_BASE(i));
700 }
701 }
702
703 static int __init mvsd_probe(struct platform_device *pdev)
704 {
705 struct mmc_host *mmc = NULL;
706 struct mvsd_host *host = NULL;
707 const struct mvsdio_platform_data *mvsd_data;
708 struct resource *r;
709 int ret, irq;
710
711 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
712 irq = platform_get_irq(pdev, 0);
713 mvsd_data = pdev->dev.platform_data;
714 if (!r || irq < 0 || !mvsd_data)
715 return -ENXIO;
716
717 r = request_mem_region(r->start, SZ_1K, DRIVER_NAME);
718 if (!r)
719 return -EBUSY;
720
721 mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
722 if (!mmc) {
723 ret = -ENOMEM;
724 goto out;
725 }
726
727 host = mmc_priv(mmc);
728 host->mmc = mmc;
729 host->dev = &pdev->dev;
730 host->res = r;
731 host->base_clock = mvsd_data->clock / 2;
732
733 mmc->ops = &mvsd_ops;
734
735 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
736 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ |
737 MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
738
739 mmc->f_min = DIV_ROUND_UP(host->base_clock, MVSD_BASE_DIV_MAX);
740 mmc->f_max = maxfreq;
741
742 mmc->max_blk_size = 2048;
743 mmc->max_blk_count = 65535;
744
745 mmc->max_hw_segs = 1;
746 mmc->max_phys_segs = 1;
747 mmc->max_seg_size = mmc->max_blk_size * mmc->max_blk_count;
748 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
749
750 spin_lock_init(&host->lock);
751
752 host->base = ioremap(r->start, SZ_4K);
753 if (!host->base) {
754 ret = -ENOMEM;
755 goto out;
756 }
757
758 /* (Re-)program MBUS remapping windows if we are asked to. */
759 if (mvsd_data->dram != NULL)
760 mv_conf_mbus_windows(host, mvsd_data->dram);
761
762 mvsd_power_down(host);
763
764 ret = request_irq(irq, mvsd_irq, 0, DRIVER_NAME, host);
765 if (ret) {
766 printk(KERN_ERR "%s: cannot assign irq %d\n", DRIVER_NAME, irq);
767 goto out;
768 } else
769 host->irq = irq;
770
771 if (mvsd_data->gpio_card_detect) {
772 ret = gpio_request(mvsd_data->gpio_card_detect,
773 DRIVER_NAME " cd");
774 if (ret == 0) {
775 gpio_direction_input(mvsd_data->gpio_card_detect);
776 irq = gpio_to_irq(mvsd_data->gpio_card_detect);
777 ret = request_irq(irq, mvsd_card_detect_irq,
778 IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING,
779 DRIVER_NAME " cd", host);
780 if (ret == 0)
781 host->gpio_card_detect =
782 mvsd_data->gpio_card_detect;
783 else
784 gpio_free(mvsd_data->gpio_card_detect);
785 }
786 }
787 if (!host->gpio_card_detect)
788 mmc->caps |= MMC_CAP_NEEDS_POLL;
789
790 if (mvsd_data->gpio_write_protect) {
791 ret = gpio_request(mvsd_data->gpio_write_protect,
792 DRIVER_NAME " wp");
793 if (ret == 0) {
794 gpio_direction_input(mvsd_data->gpio_write_protect);
795 host->gpio_write_protect =
796 mvsd_data->gpio_write_protect;
797 }
798 }
799
800 setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host);
801 platform_set_drvdata(pdev, mmc);
802 ret = mmc_add_host(mmc);
803 if (ret)
804 goto out;
805
806 printk(KERN_NOTICE "%s: %s driver initialized, ",
807 mmc_hostname(mmc), DRIVER_NAME);
808 if (host->gpio_card_detect)
809 printk("using GPIO %d for card detection\n",
810 host->gpio_card_detect);
811 else
812 printk("lacking card detect (fall back to polling)\n");
813 return 0;
814
815 out:
816 if (host) {
817 if (host->irq)
818 free_irq(host->irq, host);
819 if (host->gpio_card_detect) {
820 free_irq(gpio_to_irq(host->gpio_card_detect), host);
821 gpio_free(host->gpio_card_detect);
822 }
823 if (host->gpio_write_protect)
824 gpio_free(host->gpio_write_protect);
825 if (host->base)
826 iounmap(host->base);
827 }
828 if (r)
829 release_resource(r);
830 if (mmc)
831 mmc_free_host(mmc);
832
833 return ret;
834 }
835
836 static int __exit mvsd_remove(struct platform_device *pdev)
837 {
838 struct mmc_host *mmc = platform_get_drvdata(pdev);
839
840 if (mmc) {
841 struct mvsd_host *host = mmc_priv(mmc);
842
843 if (host->gpio_card_detect) {
844 free_irq(gpio_to_irq(host->gpio_card_detect), host);
845 gpio_free(host->gpio_card_detect);
846 }
847 mmc_remove_host(mmc);
848 free_irq(host->irq, host);
849 if (host->gpio_write_protect)
850 gpio_free(host->gpio_write_protect);
851 del_timer_sync(&host->timer);
852 mvsd_power_down(host);
853 iounmap(host->base);
854 release_resource(host->res);
855 mmc_free_host(mmc);
856 }
857 platform_set_drvdata(pdev, NULL);
858 return 0;
859 }
860
861 #ifdef CONFIG_PM
862 static int mvsd_suspend(struct platform_device *dev, pm_message_t state)
863 {
864 struct mmc_host *mmc = platform_get_drvdata(dev);
865 int ret = 0;
866
867 if (mmc)
868 ret = mmc_suspend_host(mmc, state);
869
870 return ret;
871 }
872
873 static int mvsd_resume(struct platform_device *dev)
874 {
875 struct mmc_host *mmc = platform_get_drvdata(dev);
876 int ret = 0;
877
878 if (mmc)
879 ret = mmc_resume_host(mmc);
880
881 return ret;
882 }
883 #else
884 #define mvsd_suspend NULL
885 #define mvsd_resume NULL
886 #endif
887
888 static struct platform_driver mvsd_driver = {
889 .remove = __exit_p(mvsd_remove),
890 .suspend = mvsd_suspend,
891 .resume = mvsd_resume,
892 .driver = {
893 .name = DRIVER_NAME,
894 },
895 };
896
897 static int __init mvsd_init(void)
898 {
899 return platform_driver_probe(&mvsd_driver, mvsd_probe);
900 }
901
902 static void __exit mvsd_exit(void)
903 {
904 platform_driver_unregister(&mvsd_driver);
905 }
906
907 module_init(mvsd_init);
908 module_exit(mvsd_exit);
909
910 /* maximum card clock frequency (default 50MHz) */
911 module_param(maxfreq, int, 0);
912
913 /* force PIO transfers all the time */
914 module_param(nodma, int, 0);
915
916 MODULE_AUTHOR("Maen Suleiman, Nicolas Pitre");
917 MODULE_DESCRIPTION("Marvell MMC,SD,SDIO Host Controller driver");
918 MODULE_LICENSE("GPL");
919 MODULE_ALIAS("platform:mvsdio");
Linux ARM platform port for MOXA ART SoC