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Merge remote-tracking branch 'omap_dss2/for-next'
[deliverable/linux.git] / drivers / mmc / host / moxart-mmc.c
CommitLineData
1b66e94e
JJ		 1/*
2 * MOXA ART MMC host driver.
3 *
4 * Copyright (C) 2014 Jonas Jensen
5 *
6 * Jonas Jensen <jonas.jensen@gmail.com>
7 *
8 * Based on code from
9 * Moxa Technologies Co., Ltd. <www.moxa.com>
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
1b66e94e
JJ		 16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/platform_device.h>
19#include <linux/delay.h>
3981c516 20#include <linux/errno.h>
1b66e94e
JJ		 21#include <linux/interrupt.h>
22#include <linux/blkdev.h>
23#include <linux/dma-mapping.h>
24#include <linux/dmaengine.h>
25#include <linux/mmc/host.h>
26#include <linux/mmc/sd.h>
27#include <linux/sched.h>
28#include <linux/io.h>
29#include <linux/of_address.h>
30#include <linux/of_irq.h>
31#include <linux/clk.h>
32#include <linux/bitops.h>
33#include <linux/of_dma.h>
34#include <linux/spinlock.h>
35
36#define REG_COMMAND 0
37#define REG_ARGUMENT 4
38#define REG_RESPONSE0 8
39#define REG_RESPONSE1 12
40#define REG_RESPONSE2 16
41#define REG_RESPONSE3 20
42#define REG_RESPONSE_COMMAND 24
43#define REG_DATA_CONTROL 28
44#define REG_DATA_TIMER 32
45#define REG_DATA_LENGTH 36
46#define REG_STATUS 40
47#define REG_CLEAR 44
48#define REG_INTERRUPT_MASK 48
49#define REG_POWER_CONTROL 52
50#define REG_CLOCK_CONTROL 56
51#define REG_BUS_WIDTH 60
52#define REG_DATA_WINDOW 64
53#define REG_FEATURE 68
54#define REG_REVISION 72
55
56/* REG_COMMAND */
57#define CMD_SDC_RESET BIT(10)
58#define CMD_EN BIT(9)
59#define CMD_APP_CMD BIT(8)
60#define CMD_LONG_RSP BIT(7)
61#define CMD_NEED_RSP BIT(6)
62#define CMD_IDX_MASK 0x3f
63
64/* REG_RESPONSE_COMMAND */
65#define RSP_CMD_APP BIT(6)
66#define RSP_CMD_IDX_MASK 0x3f
67
68/* REG_DATA_CONTROL */
69#define DCR_DATA_FIFO_RESET BIT(8)
70#define DCR_DATA_THRES BIT(7)
71#define DCR_DATA_EN BIT(6)
72#define DCR_DMA_EN BIT(5)
73#define DCR_DATA_WRITE BIT(4)
74#define DCR_BLK_SIZE 0x0f
75
76/* REG_DATA_LENGTH */
77#define DATA_LEN_MASK 0xffffff
78
79/* REG_STATUS */
80#define WRITE_PROT BIT(12)
81#define CARD_DETECT BIT(11)
82/* 1-10 below can be sent to either registers, interrupt or clear. */
83#define CARD_CHANGE BIT(10)
84#define FIFO_ORUN BIT(9)
85#define FIFO_URUN BIT(8)
86#define DATA_END BIT(7)
87#define CMD_SENT BIT(6)
88#define DATA_CRC_OK BIT(5)
89#define RSP_CRC_OK BIT(4)
90#define DATA_TIMEOUT BIT(3)
91#define RSP_TIMEOUT BIT(2)
92#define DATA_CRC_FAIL BIT(1)
93#define RSP_CRC_FAIL BIT(0)
94
95#define MASK_RSP (RSP_TIMEOUT | RSP_CRC_FAIL | \
96 RSP_CRC_OK | CARD_DETECT | CMD_SENT)
97
98#define MASK_DATA (DATA_CRC_OK | DATA_END | \
99 DATA_CRC_FAIL | DATA_TIMEOUT)
100
101#define MASK_INTR_PIO (FIFO_URUN | FIFO_ORUN | CARD_CHANGE)
102
103/* REG_POWER_CONTROL */
104#define SD_POWER_ON BIT(4)
105#define SD_POWER_MASK 0x0f
106
107/* REG_CLOCK_CONTROL */
108#define CLK_HISPD BIT(9)
109#define CLK_OFF BIT(8)
110#define CLK_SD BIT(7)
111#define CLK_DIV_MASK 0x7f
112
113/* REG_BUS_WIDTH */
114#define BUS_WIDTH_8 BIT(2)
115#define BUS_WIDTH_4 BIT(1)
116#define BUS_WIDTH_1 BIT(0)
117
118#define MMC_VDD_360 23
119#define MIN_POWER (MMC_VDD_360 - SD_POWER_MASK)
120#define MAX_RETRIES 500000
121
122struct moxart_host {
123 spinlock_t lock;
124
125 void __iomem *base;
126
127 phys_addr_t reg_phys;
128
129 struct dma_chan *dma_chan_tx;
130 struct dma_chan *dma_chan_rx;
131 struct dma_async_tx_descriptor *tx_desc;
132 struct mmc_host *mmc;
133 struct mmc_request *mrq;
134 struct scatterlist *cur_sg;
135 struct completion dma_complete;
136 struct completion pio_complete;
137
138 u32 num_sg;
139 u32 data_remain;
140 u32 data_len;
141 u32 fifo_width;
142 u32 timeout;
143 u32 rate;
144
145 long sysclk;
146
147 bool have_dma;
148 bool is_removed;
149};
150
151static inline void moxart_init_sg(struct moxart_host *host,
152 struct mmc_data *data)
153{
154 host->cur_sg = data->sg;
155 host->num_sg = data->sg_len;
156 host->data_remain = host->cur_sg->length;
157
158 if (host->data_remain > host->data_len)
159 host->data_remain = host->data_len;
160}
161
162static inline int moxart_next_sg(struct moxart_host *host)
163{
164 int remain;
165 struct mmc_data *data = host->mrq->cmd->data;
166
167 host->cur_sg++;
168 host->num_sg--;
169
170 if (host->num_sg > 0) {
171 host->data_remain = host->cur_sg->length;
172 remain = host->data_len - data->bytes_xfered;
173 if (remain > 0 && remain < host->data_remain)
174 host->data_remain = remain;
175 }
176
177 return host->num_sg;
178}
179
180static int moxart_wait_for_status(struct moxart_host *host,
181 u32 mask, u32 *status)
182{
183 int ret = -ETIMEDOUT;
184 u32 i;
185
186 for (i = 0; i < MAX_RETRIES; i++) {
187 *status = readl(host->base + REG_STATUS);
188 if (!(*status & mask)) {
189 udelay(5);
190 continue;
191 }
192 writel(*status & mask, host->base + REG_CLEAR);
193 ret = 0;
194 break;
195 }
196
197 if (ret)
198 dev_err(mmc_dev(host->mmc), "timed out waiting for status\n");
199
200 return ret;
201}
202
203
204static void moxart_send_command(struct moxart_host *host,
205 struct mmc_command *cmd)
206{
207 u32 status, cmdctrl;
208
209 writel(RSP_TIMEOUT | RSP_CRC_OK |
210 RSP_CRC_FAIL | CMD_SENT, host->base + REG_CLEAR);
211 writel(cmd->arg, host->base + REG_ARGUMENT);
212
213 cmdctrl = cmd->opcode & CMD_IDX_MASK;
214 if (cmdctrl == SD_APP_SET_BUS_WIDTH || cmdctrl == SD_APP_OP_COND ||
215 cmdctrl == SD_APP_SEND_SCR || cmdctrl == SD_APP_SD_STATUS ||
216 cmdctrl == SD_APP_SEND_NUM_WR_BLKS)
217 cmdctrl |= CMD_APP_CMD;
218
219 if (cmd->flags & MMC_RSP_PRESENT)
220 cmdctrl |= CMD_NEED_RSP;
221
222 if (cmd->flags & MMC_RSP_136)
223 cmdctrl |= CMD_LONG_RSP;
224
225 writel(cmdctrl | CMD_EN, host->base + REG_COMMAND);
226
227 if (moxart_wait_for_status(host, MASK_RSP, &status) == -ETIMEDOUT)
228 cmd->error = -ETIMEDOUT;
229
230 if (status & RSP_TIMEOUT) {
231 cmd->error = -ETIMEDOUT;
232 return;
233 }
234 if (status & RSP_CRC_FAIL) {
235 cmd->error = -EIO;
236 return;
237 }
238 if (status & RSP_CRC_OK) {
239 if (cmd->flags & MMC_RSP_136) {
240 cmd->resp[3] = readl(host->base + REG_RESPONSE0);
241 cmd->resp[2] = readl(host->base + REG_RESPONSE1);
242 cmd->resp[1] = readl(host->base + REG_RESPONSE2);
243 cmd->resp[0] = readl(host->base + REG_RESPONSE3);
244 } else {
245 cmd->resp[0] = readl(host->base + REG_RESPONSE0);
246 }
247 }
248}
249
250static void moxart_dma_complete(void *param)
251{
252 struct moxart_host *host = param;
253
254 complete(&host->dma_complete);
255}
256
257static void moxart_transfer_dma(struct mmc_data *data, struct moxart_host *host)
258{
259 u32 len, dir_data, dir_slave;
7c604a4b 260 long dma_time;
1b66e94e
JJ		 261 struct dma_async_tx_descriptor *desc = NULL;
262 struct dma_chan *dma_chan;
263
264 if (host->data_len == data->bytes_xfered)
265 return;
266
267 if (data->flags & MMC_DATA_WRITE) {
268 dma_chan = host->dma_chan_tx;
269 dir_data = DMA_TO_DEVICE;
270 dir_slave = DMA_MEM_TO_DEV;
271 } else {
272 dma_chan = host->dma_chan_rx;
273 dir_data = DMA_FROM_DEVICE;
274 dir_slave = DMA_DEV_TO_MEM;
275 }
276
277 len = dma_map_sg(dma_chan->device->dev, data->sg,
278 data->sg_len, dir_data);
279
280 if (len > 0) {
281 desc = dmaengine_prep_slave_sg(dma_chan, data->sg,
282 len, dir_slave,
283 DMA_PREP_INTERRUPT |
284 DMA_CTRL_ACK);
285 } else {
286 dev_err(mmc_dev(host->mmc), "dma_map_sg returned zero length\n");
287 }
288
289 if (desc) {
290 host->tx_desc = desc;
291 desc->callback = moxart_dma_complete;
292 desc->callback_param = host;
293 dmaengine_submit(desc);
294 dma_async_issue_pending(dma_chan);
295 }
296
297 data->bytes_xfered += host->data_remain;
298
299 dma_time = wait_for_completion_interruptible_timeout(
300 &host->dma_complete, host->timeout);
301
302 dma_unmap_sg(dma_chan->device->dev,
303 data->sg, data->sg_len,
304 dir_data);
305}
306
307
308static void moxart_transfer_pio(struct moxart_host *host)
309{
310 struct mmc_data *data = host->mrq->cmd->data;
311 u32 *sgp, len = 0, remain, status;
312
313 if (host->data_len == data->bytes_xfered)
314 return;
315
316 sgp = sg_virt(host->cur_sg);
317 remain = host->data_remain;
318
319 if (data->flags & MMC_DATA_WRITE) {
320 while (remain > 0) {
321 if (moxart_wait_for_status(host, FIFO_URUN, &status)
322 == -ETIMEDOUT) {
323 data->error = -ETIMEDOUT;
324 complete(&host->pio_complete);
325 return;
326 }
327 for (len = 0; len < remain && len < host->fifo_width;) {
328 iowrite32(*sgp, host->base + REG_DATA_WINDOW);
329 sgp++;
330 len += 4;
331 }
332 remain -= len;
333 }
334
335 } else {
336 while (remain > 0) {
337 if (moxart_wait_for_status(host, FIFO_ORUN, &status)
338 == -ETIMEDOUT) {
339 data->error = -ETIMEDOUT;
340 complete(&host->pio_complete);
341 return;
342 }
343 for (len = 0; len < remain && len < host->fifo_width;) {
344 /* SCR data must be read in big endian. */
345 if (data->mrq->cmd->opcode == SD_APP_SEND_SCR)
346 *sgp = ioread32be(host->base +
347 REG_DATA_WINDOW);
348 else
349 *sgp = ioread32(host->base +
350 REG_DATA_WINDOW);
351 sgp++;
352 len += 4;
353 }
354 remain -= len;
355 }
356 }
357
358 data->bytes_xfered += host->data_remain - remain;
359 host->data_remain = remain;
360
361 if (host->data_len != data->bytes_xfered)
362 moxart_next_sg(host);
363 else
364 complete(&host->pio_complete);
365}
366
367static void moxart_prepare_data(struct moxart_host *host)
368{
369 struct mmc_data *data = host->mrq->cmd->data;
370 u32 datactrl;
371 int blksz_bits;
372
373 if (!data)
374 return;
375
376 host->data_len = data->blocks * data->blksz;
377 blksz_bits = ffs(data->blksz) - 1;
378 BUG_ON(1 << blksz_bits != data->blksz);
379
380 moxart_init_sg(host, data);
381
382 datactrl = DCR_DATA_EN | (blksz_bits & DCR_BLK_SIZE);
383
384 if (data->flags & MMC_DATA_WRITE)
385 datactrl |= DCR_DATA_WRITE;
386
387 if ((host->data_len > host->fifo_width) && host->have_dma)
388 datactrl |= DCR_DMA_EN;
389
390 writel(DCR_DATA_FIFO_RESET, host->base + REG_DATA_CONTROL);
391 writel(MASK_DATA | FIFO_URUN | FIFO_ORUN, host->base + REG_CLEAR);
392 writel(host->rate, host->base + REG_DATA_TIMER);
393 writel(host->data_len, host->base + REG_DATA_LENGTH);
394 writel(datactrl, host->base + REG_DATA_CONTROL);
395}
396
397static void moxart_request(struct mmc_host *mmc, struct mmc_request *mrq)
398{
399 struct moxart_host *host = mmc_priv(mmc);
7c604a4b
NMG		 400 long pio_time;
401 unsigned long flags;
1b66e94e
JJ		 402 u32 status;
403
404 spin_lock_irqsave(&host->lock, flags);
405
406 init_completion(&host->dma_complete);
407 init_completion(&host->pio_complete);
408
409 host->mrq = mrq;
410
411 if (readl(host->base + REG_STATUS) & CARD_DETECT) {
412 mrq->cmd->error = -ETIMEDOUT;
413 goto request_done;
414 }
415
416 moxart_prepare_data(host);
417 moxart_send_command(host, host->mrq->cmd);
418
419 if (mrq->cmd->data) {
420 if ((host->data_len > host->fifo_width) && host->have_dma) {
421
422 writel(CARD_CHANGE, host->base + REG_INTERRUPT_MASK);
423
424 spin_unlock_irqrestore(&host->lock, flags);
425
426 moxart_transfer_dma(mrq->cmd->data, host);
427
428 spin_lock_irqsave(&host->lock, flags);
429 } else {
430
431 writel(MASK_INTR_PIO, host->base + REG_INTERRUPT_MASK);
432
433 spin_unlock_irqrestore(&host->lock, flags);
434
435 /* PIO transfers start from interrupt. */
436 pio_time = wait_for_completion_interruptible_timeout(
437 &host->pio_complete, host->timeout);
438
439 spin_lock_irqsave(&host->lock, flags);
440 }
441
442 if (host->is_removed) {
443 dev_err(mmc_dev(host->mmc), "card removed\n");
444 mrq->cmd->error = -ETIMEDOUT;
445 goto request_done;
446 }
447
448 if (moxart_wait_for_status(host, MASK_DATA, &status)
449 == -ETIMEDOUT) {
450 mrq->cmd->data->error = -ETIMEDOUT;
451 goto request_done;
452 }
453
454 if (status & DATA_CRC_FAIL)
455 mrq->cmd->data->error = -ETIMEDOUT;
456
457 if (mrq->cmd->data->stop)
458 moxart_send_command(host, mrq->cmd->data->stop);
459 }
460
461request_done:
462 spin_unlock_irqrestore(&host->lock, flags);
463 mmc_request_done(host->mmc, mrq);
464}
465
466static irqreturn_t moxart_irq(int irq, void *devid)
467{
468 struct moxart_host *host = (struct moxart_host *)devid;
469 u32 status;
470 unsigned long flags;
471
472 spin_lock_irqsave(&host->lock, flags);
473
474 status = readl(host->base + REG_STATUS);
475 if (status & CARD_CHANGE) {
476 host->is_removed = status & CARD_DETECT;
477 if (host->is_removed && host->have_dma) {
478 dmaengine_terminate_all(host->dma_chan_tx);
479 dmaengine_terminate_all(host->dma_chan_rx);
480 }
481 host->mrq = NULL;
482 writel(MASK_INTR_PIO, host->base + REG_CLEAR);
483 writel(CARD_CHANGE, host->base + REG_INTERRUPT_MASK);
484 mmc_detect_change(host->mmc, 0);
485 }
486 if (status & (FIFO_ORUN | FIFO_URUN) && host->mrq)
487 moxart_transfer_pio(host);
488
489 spin_unlock_irqrestore(&host->lock, flags);
490
491 return IRQ_HANDLED;
492}
493
494static void moxart_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
495{
496 struct moxart_host *host = mmc_priv(mmc);
497 unsigned long flags;
498 u8 power, div;
499 u32 ctrl;
500
501 spin_lock_irqsave(&host->lock, flags);
502
503 if (ios->clock) {
504 for (div = 0; div < CLK_DIV_MASK; ++div) {
505 if (ios->clock >= host->sysclk / (2 * (div + 1)))
506 break;
507 }
508 ctrl = CLK_SD | div;
509 host->rate = host->sysclk / (2 * (div + 1));
510 if (host->rate > host->sysclk)
511 ctrl |= CLK_HISPD;
512 writel(ctrl, host->base + REG_CLOCK_CONTROL);
513 }
514
515 if (ios->power_mode == MMC_POWER_OFF) {
516 writel(readl(host->base + REG_POWER_CONTROL) & ~SD_POWER_ON,
517 host->base + REG_POWER_CONTROL);
518 } else {
519 if (ios->vdd < MIN_POWER)
520 power = 0;
521 else
522 power = ios->vdd - MIN_POWER;
523
524 writel(SD_POWER_ON | (u32) power,
525 host->base + REG_POWER_CONTROL);
526 }
527
528 switch (ios->bus_width) {
529 case MMC_BUS_WIDTH_4:
530 writel(BUS_WIDTH_4, host->base + REG_BUS_WIDTH);
531 break;
532 case MMC_BUS_WIDTH_8:
533 writel(BUS_WIDTH_8, host->base + REG_BUS_WIDTH);
534 break;
535 default:
536 writel(BUS_WIDTH_1, host->base + REG_BUS_WIDTH);
537 break;
538 }
539
540 spin_unlock_irqrestore(&host->lock, flags);
541}
542
543
544static int moxart_get_ro(struct mmc_host *mmc)
545{
546 struct moxart_host *host = mmc_priv(mmc);
547
548 return !!(readl(host->base + REG_STATUS) & WRITE_PROT);
549}
550
551static struct mmc_host_ops moxart_ops = {
552 .request = moxart_request,
553 .set_ios = moxart_set_ios,
554 .get_ro = moxart_get_ro,
555};
556
557static int moxart_probe(struct platform_device *pdev)
558{
559 struct device *dev = &pdev->dev;
560 struct device_node *node = dev->of_node;
561 struct resource res_mmc;
562 struct mmc_host *mmc;
563 struct moxart_host *host = NULL;
564 struct dma_slave_config cfg;
565 struct clk *clk;
566 void __iomem *reg_mmc;
1b66e94e
JJ		 567 int irq, ret;
568 u32 i;
569
570 mmc = mmc_alloc_host(sizeof(struct moxart_host), dev);
571 if (!mmc) {
572 dev_err(dev, "mmc_alloc_host failed\n");
573 ret = -ENOMEM;
574 goto out;
575 }
576
577 ret = of_address_to_resource(node, 0, &res_mmc);
578 if (ret) {
579 dev_err(dev, "of_address_to_resource failed\n");
580 goto out;
581 }
582
583 irq = irq_of_parse_and_map(node, 0);
584 if (irq <= 0) {
585 dev_err(dev, "irq_of_parse_and_map failed\n");
586 ret = -EINVAL;
587 goto out;
588 }
589
3981c516 590 clk = devm_clk_get(dev, NULL);
1b66e94e 591 if (IS_ERR(clk)) {
1b66e94e
JJ		 592 ret = PTR_ERR(clk);
593 goto out;
594 }
595
596 reg_mmc = devm_ioremap_resource(dev, &res_mmc);
597 if (IS_ERR(reg_mmc)) {
598 ret = PTR_ERR(reg_mmc);
599 goto out;
600 }
601
6d2b4218
UH		 602 ret = mmc_of_parse(mmc);
603 if (ret)
604 goto out;
1b66e94e 605
1b66e94e
JJ		 606 host = mmc_priv(mmc);
607 host->mmc = mmc;
608 host->base = reg_mmc;
609 host->reg_phys = res_mmc.start;
610 host->timeout = msecs_to_jiffies(1000);
611 host->sysclk = clk_get_rate(clk);
612 host->fifo_width = readl(host->base + REG_FEATURE) << 2;
3981c516
AB		 613 host->dma_chan_tx = dma_request_slave_channel_reason(dev, "tx");
614 host->dma_chan_rx = dma_request_slave_channel_reason(dev, "rx");
1b66e94e
JJ		 615
616 spin_lock_init(&host->lock);
617
618 mmc->ops = &moxart_ops;
619 mmc->f_max = DIV_ROUND_CLOSEST(host->sysclk, 2);
620 mmc->f_min = DIV_ROUND_CLOSEST(host->sysclk, CLK_DIV_MASK * 2);
621 mmc->ocr_avail = 0xffff00; /* Support 2.0v - 3.6v power. */
622
623 if (IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) {
3981c516
AB		 624 if (PTR_ERR(host->dma_chan_tx) == -EPROBE_DEFER ||
625 PTR_ERR(host->dma_chan_rx) == -EPROBE_DEFER) {
626 ret = -EPROBE_DEFER;
627 goto out;
628 }
1b66e94e
JJ		 629 dev_dbg(dev, "PIO mode transfer enabled\n");
630 host->have_dma = false;
631 } else {
632 dev_dbg(dev, "DMA channels found (%p,%p)\n",
633 host->dma_chan_tx, host->dma_chan_rx);
634 host->have_dma = true;
635
636 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
637 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
638
639 cfg.direction = DMA_MEM_TO_DEV;
640 cfg.src_addr = 0;
641 cfg.dst_addr = host->reg_phys + REG_DATA_WINDOW;
642 dmaengine_slave_config(host->dma_chan_tx, &cfg);
643
644 cfg.direction = DMA_DEV_TO_MEM;
645 cfg.src_addr = host->reg_phys + REG_DATA_WINDOW;
646 cfg.dst_addr = 0;
647 dmaengine_slave_config(host->dma_chan_rx, &cfg);
648 }
649
650 switch ((readl(host->base + REG_BUS_WIDTH) >> 3) & 3) {
651 case 1:
652 mmc->caps |= MMC_CAP_4_BIT_DATA;
653 break;
654 case 2:
655 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
656 break;
657 default:
658 break;
659 }
660
661 writel(0, host->base + REG_INTERRUPT_MASK);
662
663 writel(CMD_SDC_RESET, host->base + REG_COMMAND);
664 for (i = 0; i < MAX_RETRIES; i++) {
665 if (!(readl(host->base + REG_COMMAND) & CMD_SDC_RESET))
666 break;
667 udelay(5);
668 }
669
670 ret = devm_request_irq(dev, irq, moxart_irq, 0, "moxart-mmc", host);
671 if (ret)
672 goto out;
673
674 dev_set_drvdata(dev, mmc);
675 mmc_add_host(mmc);
676
677 dev_dbg(dev, "IRQ=%d, FIFO is %d bytes\n", irq, host->fifo_width);
678
679 return 0;
680
681out:
682 if (mmc)
683 mmc_free_host(mmc);
684 return ret;
685}
686
687static int moxart_remove(struct platform_device *pdev)
688{
689 struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
690 struct moxart_host *host = mmc_priv(mmc);
691
692 dev_set_drvdata(&pdev->dev, NULL);
693
694 if (mmc) {
695 if (!IS_ERR(host->dma_chan_tx))
696 dma_release_channel(host->dma_chan_tx);
697 if (!IS_ERR(host->dma_chan_rx))
698 dma_release_channel(host->dma_chan_rx);
699 mmc_remove_host(mmc);
700 mmc_free_host(mmc);
701
702 writel(0, host->base + REG_INTERRUPT_MASK);
703 writel(0, host->base + REG_POWER_CONTROL);
704 writel(readl(host->base + REG_CLOCK_CONTROL) | CLK_OFF,
705 host->base + REG_CLOCK_CONTROL);
706 }
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JJ		 707 return 0;
708}
709
710static const struct of_device_id moxart_mmc_match[] = {
711 { .compatible = "moxa,moxart-mmc" },
712 { .compatible = "faraday,ftsdc010" },
713 { }
714};
77452353 715MODULE_DEVICE_TABLE(of, moxart_mmc_match);
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JJ		 716
717static struct platform_driver moxart_mmc_driver = {
718 .probe = moxart_probe,
719 .remove = moxart_remove,
720 .driver = {
721 .name = "mmc-moxart",
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JJ		 722 .of_match_table = moxart_mmc_match,
723 },
724};
725module_platform_driver(moxart_mmc_driver);
726
727MODULE_ALIAS("platform:mmc-moxart");
728MODULE_DESCRIPTION("MOXA ART MMC driver");
729MODULE_LICENSE("GPL v2");
730MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
Linux kernel - Deliverables
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