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libata-acpi: Fix NULL ptr derference in ata_acpi_dev_handle
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / ata / pata_arasan_cf.c
CommitLineData
a480167b
VK		 1/*
2 * drivers/ata/pata_arasan_cf.c
3 *
4 * Arasan Compact Flash host controller source file
5 *
6 * Copyright (C) 2011 ST Microelectronics
10d8935f 7 * Viresh Kumar <viresh.linux@gmail.com>
a480167b
VK		 8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 */
13
14/*
15 * The Arasan CompactFlash Device Controller IP core has three basic modes of
16 * operation: PC card ATA using I/O mode, PC card ATA using memory mode, PC card
17 * ATA using true IDE modes. This driver supports only True IDE mode currently.
18 *
19 * Arasan CF Controller shares global irq register with Arasan XD Controller.
20 *
21 * Tested on arch/arm/mach-spear13xx
22 */
23
24#include <linux/ata.h>
25#include <linux/clk.h>
26#include <linux/completion.h>
27#include <linux/delay.h>
28#include <linux/dmaengine.h>
29#include <linux/io.h>
30#include <linux/irq.h>
31#include <linux/kernel.h>
32#include <linux/libata.h>
33#include <linux/module.h>
26fdaa74 34#include <linux/of.h>
a480167b
VK		 35#include <linux/pata_arasan_cf_data.h>
36#include <linux/platform_device.h>
37#include <linux/pm.h>
38#include <linux/slab.h>
39#include <linux/spinlock.h>
40#include <linux/types.h>
41#include <linux/workqueue.h>
42
43#define DRIVER_NAME "arasan_cf"
44#define TIMEOUT msecs_to_jiffies(3000)
45
46/* Registers */
47/* CompactFlash Interface Status */
48#define CFI_STS 0x000
49 #define STS_CHG (1)
50 #define BIN_AUDIO_OUT (1 << 1)
51 #define CARD_DETECT1 (1 << 2)
52 #define CARD_DETECT2 (1 << 3)
53 #define INP_ACK (1 << 4)
54 #define CARD_READY (1 << 5)
55 #define IO_READY (1 << 6)
56 #define B16_IO_PORT_SEL (1 << 7)
57/* IRQ */
58#define IRQ_STS 0x004
59/* Interrupt Enable */
60#define IRQ_EN 0x008
61 #define CARD_DETECT_IRQ (1)
62 #define STATUS_CHNG_IRQ (1 << 1)
63 #define MEM_MODE_IRQ (1 << 2)
64 #define IO_MODE_IRQ (1 << 3)
65 #define TRUE_IDE_MODE_IRQ (1 << 8)
66 #define PIO_XFER_ERR_IRQ (1 << 9)
67 #define BUF_AVAIL_IRQ (1 << 10)
68 #define XFER_DONE_IRQ (1 << 11)
69 #define IGNORED_IRQS (STATUS_CHNG_IRQ | MEM_MODE_IRQ | IO_MODE_IRQ |\
70 TRUE_IDE_MODE_IRQ)
71 #define TRUE_IDE_IRQS (CARD_DETECT_IRQ | PIO_XFER_ERR_IRQ |\
72 BUF_AVAIL_IRQ | XFER_DONE_IRQ)
73/* Operation Mode */
74#define OP_MODE 0x00C
75 #define CARD_MODE_MASK (0x3)
76 #define MEM_MODE (0x0)
77 #define IO_MODE (0x1)
78 #define TRUE_IDE_MODE (0x2)
79
80 #define CARD_TYPE_MASK (1 << 2)
81 #define CF_CARD (0)
82 #define CF_PLUS_CARD (1 << 2)
83
84 #define CARD_RESET (1 << 3)
85 #define CFHOST_ENB (1 << 4)
86 #define OUTPUTS_TRISTATE (1 << 5)
87 #define ULTRA_DMA_ENB (1 << 8)
88 #define MULTI_WORD_DMA_ENB (1 << 9)
89 #define DRQ_BLOCK_SIZE_MASK (0x3 << 11)
90 #define DRQ_BLOCK_SIZE_512 (0)
91 #define DRQ_BLOCK_SIZE_1024 (1 << 11)
92 #define DRQ_BLOCK_SIZE_2048 (2 << 11)
93 #define DRQ_BLOCK_SIZE_4096 (3 << 11)
94/* CF Interface Clock Configuration */
95#define CLK_CFG 0x010
96 #define CF_IF_CLK_MASK (0XF)
97/* CF Timing Mode Configuration */
98#define TM_CFG 0x014
99 #define MEM_MODE_TIMING_MASK (0x3)
100 #define MEM_MODE_TIMING_250NS (0x0)
101 #define MEM_MODE_TIMING_120NS (0x1)
102 #define MEM_MODE_TIMING_100NS (0x2)
103 #define MEM_MODE_TIMING_80NS (0x3)
104
105 #define IO_MODE_TIMING_MASK (0x3 << 2)
106 #define IO_MODE_TIMING_250NS (0x0 << 2)
107 #define IO_MODE_TIMING_120NS (0x1 << 2)
108 #define IO_MODE_TIMING_100NS (0x2 << 2)
109 #define IO_MODE_TIMING_80NS (0x3 << 2)
110
111 #define TRUEIDE_PIO_TIMING_MASK (0x7 << 4)
112 #define TRUEIDE_PIO_TIMING_SHIFT 4
113
114 #define TRUEIDE_MWORD_DMA_TIMING_MASK (0x7 << 7)
115 #define TRUEIDE_MWORD_DMA_TIMING_SHIFT 7
116
117 #define ULTRA_DMA_TIMING_MASK (0x7 << 10)
118 #define ULTRA_DMA_TIMING_SHIFT 10
119/* CF Transfer Address */
120#define XFER_ADDR 0x014
121 #define XFER_ADDR_MASK (0x7FF)
122 #define MAX_XFER_COUNT 0x20000u
123/* Transfer Control */
124#define XFER_CTR 0x01C
125 #define XFER_COUNT_MASK (0x3FFFF)
126 #define ADDR_INC_DISABLE (1 << 24)
127 #define XFER_WIDTH_MASK (1 << 25)
128 #define XFER_WIDTH_8B (0)
129 #define XFER_WIDTH_16B (1 << 25)
130
131 #define MEM_TYPE_MASK (1 << 26)
132 #define MEM_TYPE_COMMON (0)
133 #define MEM_TYPE_ATTRIBUTE (1 << 26)
134
135 #define MEM_IO_XFER_MASK (1 << 27)
136 #define MEM_XFER (0)
137 #define IO_XFER (1 << 27)
138
139 #define DMA_XFER_MODE (1 << 28)
140
141 #define AHB_BUS_NORMAL_PIO_OPRTN (~(1 << 29))
142 #define XFER_DIR_MASK (1 << 30)
143 #define XFER_READ (0)
144 #define XFER_WRITE (1 << 30)
145
146 #define XFER_START (1 << 31)
147/* Write Data Port */
148#define WRITE_PORT 0x024
149/* Read Data Port */
150#define READ_PORT 0x028
151/* ATA Data Port */
152#define ATA_DATA_PORT 0x030
153 #define ATA_DATA_PORT_MASK (0xFFFF)
154/* ATA Error/Features */
155#define ATA_ERR_FTR 0x034
156/* ATA Sector Count */
157#define ATA_SC 0x038
158/* ATA Sector Number */
159#define ATA_SN 0x03C
160/* ATA Cylinder Low */
161#define ATA_CL 0x040
162/* ATA Cylinder High */
163#define ATA_CH 0x044
164/* ATA Select Card/Head */
165#define ATA_SH 0x048
166/* ATA Status-Command */
167#define ATA_STS_CMD 0x04C
168/* ATA Alternate Status/Device Control */
169#define ATA_ASTS_DCTR 0x050
170/* Extended Write Data Port 0x200-0x3FC */
171#define EXT_WRITE_PORT 0x200
172/* Extended Read Data Port 0x400-0x5FC */
173#define EXT_READ_PORT 0x400
174 #define FIFO_SIZE 0x200u
175/* Global Interrupt Status */
176#define GIRQ_STS 0x800
177/* Global Interrupt Status enable */
178#define GIRQ_STS_EN 0x804
179/* Global Interrupt Signal enable */
180#define GIRQ_SGN_EN 0x808
181 #define GIRQ_CF (1)
182 #define GIRQ_XD (1 << 1)
183
184/* Compact Flash Controller Dev Structure */
185struct arasan_cf_dev {
186 /* pointer to ata_host structure */
187 struct ata_host *host;
d14fb1e9 188 /* clk structure */
a480167b 189 struct clk *clk;
a480167b
VK		 190
191 /* physical base address of controller */
192 dma_addr_t pbase;
193 /* virtual base address of controller */
194 void __iomem *vbase;
195 /* irq number*/
196 int irq;
197
198 /* status to be updated to framework regarding DMA transfer */
199 u8 dma_status;
200 /* Card is present or Not */
201 u8 card_present;
202
203 /* dma specific */
204 /* Completion for transfer complete interrupt from controller */
205 struct completion cf_completion;
206 /* Completion for DMA transfer complete. */
207 struct completion dma_completion;
208 /* Dma channel allocated */
209 struct dma_chan *dma_chan;
210 /* Mask for DMA transfers */
211 dma_cap_mask_t mask;
60a230e4
VK		 212 /* dma channel private data */
213 void *dma_priv;
a480167b
VK		 214 /* DMA transfer work */
215 struct work_struct work;
216 /* DMA delayed finish work */
217 struct delayed_work dwork;
218 /* qc to be transferred using DMA */
219 struct ata_queued_cmd *qc;
220};
221
222static struct scsi_host_template arasan_cf_sht = {
223 ATA_BASE_SHT(DRIVER_NAME),
224 .sg_tablesize = SG_NONE,
225 .dma_boundary = 0xFFFFFFFFUL,
226};
227
228static void cf_dumpregs(struct arasan_cf_dev *acdev)
229{
230 struct device *dev = acdev->host->dev;
231
232 dev_dbg(dev, ": =========== REGISTER DUMP ===========");
233 dev_dbg(dev, ": CFI_STS: %x", readl(acdev->vbase + CFI_STS));
234 dev_dbg(dev, ": IRQ_STS: %x", readl(acdev->vbase + IRQ_STS));
235 dev_dbg(dev, ": IRQ_EN: %x", readl(acdev->vbase + IRQ_EN));
236 dev_dbg(dev, ": OP_MODE: %x", readl(acdev->vbase + OP_MODE));
237 dev_dbg(dev, ": CLK_CFG: %x", readl(acdev->vbase + CLK_CFG));
238 dev_dbg(dev, ": TM_CFG: %x", readl(acdev->vbase + TM_CFG));
239 dev_dbg(dev, ": XFER_CTR: %x", readl(acdev->vbase + XFER_CTR));
240 dev_dbg(dev, ": GIRQ_STS: %x", readl(acdev->vbase + GIRQ_STS));
241 dev_dbg(dev, ": GIRQ_STS_EN: %x", readl(acdev->vbase + GIRQ_STS_EN));
242 dev_dbg(dev, ": GIRQ_SGN_EN: %x", readl(acdev->vbase + GIRQ_SGN_EN));
243 dev_dbg(dev, ": =====================================");
244}
245
246/* Enable/Disable global interrupts shared between CF and XD ctrlr. */
247static void cf_ginterrupt_enable(struct arasan_cf_dev *acdev, bool enable)
248{
249 /* enable should be 0 or 1 */
250 writel(enable, acdev->vbase + GIRQ_STS_EN);
251 writel(enable, acdev->vbase + GIRQ_SGN_EN);
252}
253
254/* Enable/Disable CF interrupts */
255static inline void
256cf_interrupt_enable(struct arasan_cf_dev *acdev, u32 mask, bool enable)
257{
258 u32 val = readl(acdev->vbase + IRQ_EN);
259 /* clear & enable/disable irqs */
260 if (enable) {
261 writel(mask, acdev->vbase + IRQ_STS);
262 writel(val | mask, acdev->vbase + IRQ_EN);
263 } else
264 writel(val & ~mask, acdev->vbase + IRQ_EN);
265}
266
267static inline void cf_card_reset(struct arasan_cf_dev *acdev)
268{
269 u32 val = readl(acdev->vbase + OP_MODE);
270
271 writel(val | CARD_RESET, acdev->vbase + OP_MODE);
272 udelay(200);
273 writel(val & ~CARD_RESET, acdev->vbase + OP_MODE);
274}
275
276static inline void cf_ctrl_reset(struct arasan_cf_dev *acdev)
277{
278 writel(readl(acdev->vbase + OP_MODE) & ~CFHOST_ENB,
279 acdev->vbase + OP_MODE);
280 writel(readl(acdev->vbase + OP_MODE) | CFHOST_ENB,
281 acdev->vbase + OP_MODE);
282}
283
284static void cf_card_detect(struct arasan_cf_dev *acdev, bool hotplugged)
285{
286 struct ata_port *ap = acdev->host->ports[0];
287 struct ata_eh_info *ehi = &ap->link.eh_info;
288 u32 val = readl(acdev->vbase + CFI_STS);
289
290 /* Both CD1 & CD2 should be low if card inserted completely */
291 if (!(val & (CARD_DETECT1 | CARD_DETECT2))) {
292 if (acdev->card_present)
293 return;
294 acdev->card_present = 1;
295 cf_card_reset(acdev);
296 } else {
297 if (!acdev->card_present)
298 return;
299 acdev->card_present = 0;
300 }
301
302 if (hotplugged) {
303 ata_ehi_hotplugged(ehi);
304 ata_port_freeze(ap);
305 }
306}
307
308static int cf_init(struct arasan_cf_dev *acdev)
309{
310 struct arasan_cf_pdata *pdata = dev_get_platdata(acdev->host->dev);
311 unsigned long flags;
312 int ret = 0;
313
3f09e6c0 314 ret = clk_prepare_enable(acdev->clk);
a480167b
VK		 315 if (ret) {
316 dev_dbg(acdev->host->dev, "clock enable failed");
317 return ret;
318 }
a480167b
VK		 319
320 spin_lock_irqsave(&acdev->host->lock, flags);
321 /* configure CF interface clock */
322 writel((pdata->cf_if_clk <= CF_IF_CLK_200M) ? pdata->cf_if_clk :
323 CF_IF_CLK_166M, acdev->vbase + CLK_CFG);
324
325 writel(TRUE_IDE_MODE | CFHOST_ENB, acdev->vbase + OP_MODE);
326 cf_interrupt_enable(acdev, CARD_DETECT_IRQ, 1);
327 cf_ginterrupt_enable(acdev, 1);
328 spin_unlock_irqrestore(&acdev->host->lock, flags);
329
330 return ret;
331}
332
333static void cf_exit(struct arasan_cf_dev *acdev)
334{
335 unsigned long flags;
336
337 spin_lock_irqsave(&acdev->host->lock, flags);
338 cf_ginterrupt_enable(acdev, 0);
339 cf_interrupt_enable(acdev, TRUE_IDE_IRQS, 0);
340 cf_card_reset(acdev);
341 writel(readl(acdev->vbase + OP_MODE) & ~CFHOST_ENB,
342 acdev->vbase + OP_MODE);
343 spin_unlock_irqrestore(&acdev->host->lock, flags);
3f09e6c0 344 clk_disable_unprepare(acdev->clk);
a480167b
VK		 345}
346
347static void dma_callback(void *dev)
348{
349 struct arasan_cf_dev *acdev = (struct arasan_cf_dev *) dev;
350
351 complete(&acdev->dma_completion);
352}
353
354static bool filter(struct dma_chan *chan, void *slave)
355{
60a230e4 356 chan->private = slave;
a480167b
VK		 357 return true;
358}
359
360static inline void dma_complete(struct arasan_cf_dev *acdev)
361{
362 struct ata_queued_cmd *qc = acdev->qc;
363 unsigned long flags;
364
365 acdev->qc = NULL;
366 ata_sff_interrupt(acdev->irq, acdev->host);
367
368 spin_lock_irqsave(&acdev->host->lock, flags);
369 if (unlikely(qc->err_mask) && ata_is_dma(qc->tf.protocol))
370 ata_ehi_push_desc(&qc->ap->link.eh_info, "DMA Failed: Timeout");
371 spin_unlock_irqrestore(&acdev->host->lock, flags);
372}
373
374static inline int wait4buf(struct arasan_cf_dev *acdev)
375{
376 if (!wait_for_completion_timeout(&acdev->cf_completion, TIMEOUT)) {
377 u32 rw = acdev->qc->tf.flags & ATA_TFLAG_WRITE;
378
379 dev_err(acdev->host->dev, "%s TimeOut", rw ? "write" : "read");
380 return -ETIMEDOUT;
381 }
382
25985edc 383 /* Check if PIO Error interrupt has occurred */
a480167b
VK		 384 if (acdev->dma_status & ATA_DMA_ERR)
385 return -EAGAIN;
386
387 return 0;
388}
389
390static int
391dma_xfer(struct arasan_cf_dev *acdev, dma_addr_t src, dma_addr_t dest, u32 len)
392{
393 struct dma_async_tx_descriptor *tx;
394 struct dma_chan *chan = acdev->dma_chan;
395 dma_cookie_t cookie;
396 unsigned long flags = DMA_PREP_INTERRUPT | DMA_COMPL_SKIP_SRC_UNMAP |
397 DMA_COMPL_SKIP_DEST_UNMAP;
398 int ret = 0;
399
400 tx = chan->device->device_prep_dma_memcpy(chan, dest, src, len, flags);
401 if (!tx) {
402 dev_err(acdev->host->dev, "device_prep_dma_memcpy failed\n");
403 return -EAGAIN;
404 }
405
406 tx->callback = dma_callback;
407 tx->callback_param = acdev;
408 cookie = tx->tx_submit(tx);
409
410 ret = dma_submit_error(cookie);
411 if (ret) {
412 dev_err(acdev->host->dev, "dma_submit_error\n");
413 return ret;
414 }
415
416 chan->device->device_issue_pending(chan);
417
418 /* Wait for DMA to complete */
419 if (!wait_for_completion_timeout(&acdev->dma_completion, TIMEOUT)) {
420 chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
421 dev_err(acdev->host->dev, "wait_for_completion_timeout\n");
422 return -ETIMEDOUT;
423 }
424
425 return ret;
426}
427
428static int sg_xfer(struct arasan_cf_dev *acdev, struct scatterlist *sg)
429{
430 dma_addr_t dest = 0, src = 0;
431 u32 xfer_cnt, sglen, dma_len, xfer_ctr;
432 u32 write = acdev->qc->tf.flags & ATA_TFLAG_WRITE;
433 unsigned long flags;
434 int ret = 0;
435
436 sglen = sg_dma_len(sg);
437 if (write) {
438 src = sg_dma_address(sg);
439 dest = acdev->pbase + EXT_WRITE_PORT;
440 } else {
441 dest = sg_dma_address(sg);
442 src = acdev->pbase + EXT_READ_PORT;
443 }
444
445 /*
446 * For each sg:
447 * MAX_XFER_COUNT data will be transferred before we get transfer
25985edc 448 * complete interrupt. Between after FIFO_SIZE data
a480167b
VK		 449 * buffer available interrupt will be generated. At this time we will
450 * fill FIFO again: max FIFO_SIZE data.
451 */
452 while (sglen) {
453 xfer_cnt = min(sglen, MAX_XFER_COUNT);
454 spin_lock_irqsave(&acdev->host->lock, flags);
455 xfer_ctr = readl(acdev->vbase + XFER_CTR) &
456 ~XFER_COUNT_MASK;
457 writel(xfer_ctr | xfer_cnt | XFER_START,
458 acdev->vbase + XFER_CTR);
459 spin_unlock_irqrestore(&acdev->host->lock, flags);
460
25985edc 461 /* continue dma xfers until current sg is completed */
a480167b
VK		 462 while (xfer_cnt) {
463 /* wait for read to complete */
464 if (!write) {
465 ret = wait4buf(acdev);
466 if (ret)
467 goto fail;
468 }
469
470 /* read/write FIFO in chunk of FIFO_SIZE */
471 dma_len = min(xfer_cnt, FIFO_SIZE);
472 ret = dma_xfer(acdev, src, dest, dma_len);
473 if (ret) {
474 dev_err(acdev->host->dev, "dma failed");
475 goto fail;
476 }
477
478 if (write)
479 src += dma_len;
480 else
481 dest += dma_len;
482
483 sglen -= dma_len;
484 xfer_cnt -= dma_len;
485
486 /* wait for write to complete */
487 if (write) {
488 ret = wait4buf(acdev);
489 if (ret)
490 goto fail;
491 }
492 }
493 }
494
495fail:
496 spin_lock_irqsave(&acdev->host->lock, flags);
497 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START,
498 acdev->vbase + XFER_CTR);
499 spin_unlock_irqrestore(&acdev->host->lock, flags);
500
501 return ret;
502}
503
504/*
505 * This routine uses External DMA controller to read/write data to FIFO of CF
506 * controller. There are two xfer related interrupt supported by CF controller:
507 * - buf_avail: This interrupt is generated as soon as we have buffer of 512
508 * bytes available for reading or empty buffer available for writing.
509 * - xfer_done: This interrupt is generated on transfer of "xfer_size" amount of
510 * data to/from FIFO. xfer_size is programmed in XFER_CTR register.
511 *
512 * Max buffer size = FIFO_SIZE = 512 Bytes.
513 * Max xfer_size = MAX_XFER_COUNT = 256 KB.
514 */
515static void data_xfer(struct work_struct *work)
516{
517 struct arasan_cf_dev *acdev = container_of(work, struct arasan_cf_dev,
518 work);
519 struct ata_queued_cmd *qc = acdev->qc;
520 struct scatterlist *sg;
521 unsigned long flags;
522 u32 temp;
523 int ret = 0;
524
525 /* request dma channels */
526 /* dma_request_channel may sleep, so calling from process context */
60a230e4
VK		 527 acdev->dma_chan = dma_request_channel(acdev->mask, filter,
528 acdev->dma_priv);
a480167b
VK		 529 if (!acdev->dma_chan) {
530 dev_err(acdev->host->dev, "Unable to get dma_chan\n");
531 goto chan_request_fail;
532 }
533
534 for_each_sg(qc->sg, sg, qc->n_elem, temp) {
535 ret = sg_xfer(acdev, sg);
536 if (ret)
537 break;
538 }
539
540 dma_release_channel(acdev->dma_chan);
541
542 /* data xferred successfully */
543 if (!ret) {
544 u32 status;
545
546 spin_lock_irqsave(&acdev->host->lock, flags);
547 status = ioread8(qc->ap->ioaddr.altstatus_addr);
548 spin_unlock_irqrestore(&acdev->host->lock, flags);
549 if (status & (ATA_BUSY | ATA_DRQ)) {
550 ata_sff_queue_delayed_work(&acdev->dwork, 1);
551 return;
552 }
553
554 goto sff_intr;
555 }
556
557 cf_dumpregs(acdev);
558
559chan_request_fail:
560 spin_lock_irqsave(&acdev->host->lock, flags);
25985edc 561 /* error when transferring data to/from memory */
a480167b
VK		 562 qc->err_mask |= AC_ERR_HOST_BUS;
563 qc->ap->hsm_task_state = HSM_ST_ERR;
564
565 cf_ctrl_reset(acdev);
566 spin_unlock_irqrestore(qc->ap->lock, flags);
567sff_intr:
568 dma_complete(acdev);
569}
570
571static void delayed_finish(struct work_struct *work)
572{
573 struct arasan_cf_dev *acdev = container_of(work, struct arasan_cf_dev,
574 dwork.work);
575 struct ata_queued_cmd *qc = acdev->qc;
576 unsigned long flags;
577 u8 status;
578
579 spin_lock_irqsave(&acdev->host->lock, flags);
580 status = ioread8(qc->ap->ioaddr.altstatus_addr);
581 spin_unlock_irqrestore(&acdev->host->lock, flags);
582
583 if (status & (ATA_BUSY | ATA_DRQ))
584 ata_sff_queue_delayed_work(&acdev->dwork, 1);
585 else
586 dma_complete(acdev);
587}
588
589static irqreturn_t arasan_cf_interrupt(int irq, void *dev)
590{
591 struct arasan_cf_dev *acdev = ((struct ata_host *)dev)->private_data;
592 unsigned long flags;
593 u32 irqsts;
594
595 irqsts = readl(acdev->vbase + GIRQ_STS);
596 if (!(irqsts & GIRQ_CF))
597 return IRQ_NONE;
598
599 spin_lock_irqsave(&acdev->host->lock, flags);
600 irqsts = readl(acdev->vbase + IRQ_STS);
601 writel(irqsts, acdev->vbase + IRQ_STS); /* clear irqs */
602 writel(GIRQ_CF, acdev->vbase + GIRQ_STS); /* clear girqs */
603
604 /* handle only relevant interrupts */
605 irqsts &= ~IGNORED_IRQS;
606
607 if (irqsts & CARD_DETECT_IRQ) {
608 cf_card_detect(acdev, 1);
609 spin_unlock_irqrestore(&acdev->host->lock, flags);
610 return IRQ_HANDLED;
611 }
612
613 if (irqsts & PIO_XFER_ERR_IRQ) {
614 acdev->dma_status = ATA_DMA_ERR;
615 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START,
616 acdev->vbase + XFER_CTR);
617 spin_unlock_irqrestore(&acdev->host->lock, flags);
618 complete(&acdev->cf_completion);
619 dev_err(acdev->host->dev, "pio xfer err irq\n");
620 return IRQ_HANDLED;
621 }
622
623 spin_unlock_irqrestore(&acdev->host->lock, flags);
624
625 if (irqsts & BUF_AVAIL_IRQ) {
626 complete(&acdev->cf_completion);
627 return IRQ_HANDLED;
628 }
629
630 if (irqsts & XFER_DONE_IRQ) {
631 struct ata_queued_cmd *qc = acdev->qc;
632
633 /* Send Complete only for write */
634 if (qc->tf.flags & ATA_TFLAG_WRITE)
635 complete(&acdev->cf_completion);
636 }
637
638 return IRQ_HANDLED;
639}
640
641static void arasan_cf_freeze(struct ata_port *ap)
642{
643 struct arasan_cf_dev *acdev = ap->host->private_data;
644
645 /* stop transfer and reset controller */
646 writel(readl(acdev->vbase + XFER_CTR) & ~XFER_START,
647 acdev->vbase + XFER_CTR);
648 cf_ctrl_reset(acdev);
649 acdev->dma_status = ATA_DMA_ERR;
650
651 ata_sff_dma_pause(ap);
652 ata_sff_freeze(ap);
653}
654
655void arasan_cf_error_handler(struct ata_port *ap)
656{
657 struct arasan_cf_dev *acdev = ap->host->private_data;
658
659 /*
660 * DMA transfers using an external DMA controller may be scheduled.
661 * Abort them before handling error. Refer data_xfer() for further
662 * details.
663 */
664 cancel_work_sync(&acdev->work);
665 cancel_delayed_work_sync(&acdev->dwork);
666 return ata_sff_error_handler(ap);
667}
668
669static void arasan_cf_dma_start(struct arasan_cf_dev *acdev)
670{
671 u32 xfer_ctr = readl(acdev->vbase + XFER_CTR) & ~XFER_DIR_MASK;
672 u32 write = acdev->qc->tf.flags & ATA_TFLAG_WRITE;
673
674 xfer_ctr |= write ? XFER_WRITE : XFER_READ;
675 writel(xfer_ctr, acdev->vbase + XFER_CTR);
676
677 acdev->qc->ap->ops->sff_exec_command(acdev->qc->ap, &acdev->qc->tf);
678 ata_sff_queue_work(&acdev->work);
679}
680
681unsigned int arasan_cf_qc_issue(struct ata_queued_cmd *qc)
682{
683 struct ata_port *ap = qc->ap;
684 struct arasan_cf_dev *acdev = ap->host->private_data;
685
686 /* defer PIO handling to sff_qc_issue */
687 if (!ata_is_dma(qc->tf.protocol))
688 return ata_sff_qc_issue(qc);
689
690 /* select the device */
691 ata_wait_idle(ap);
692 ata_sff_dev_select(ap, qc->dev->devno);
693 ata_wait_idle(ap);
694
695 /* start the command */
696 switch (qc->tf.protocol) {
697 case ATA_PROT_DMA:
698 WARN_ON_ONCE(qc->tf.flags & ATA_TFLAG_POLLING);
699
700 ap->ops->sff_tf_load(ap, &qc->tf);
701 acdev->dma_status = 0;
702 acdev->qc = qc;
703 arasan_cf_dma_start(acdev);
704 ap->hsm_task_state = HSM_ST_LAST;
705 break;
706
707 default:
708 WARN_ON(1);
709 return AC_ERR_SYSTEM;
710 }
711
712 return 0;
713}
714
715static void arasan_cf_set_piomode(struct ata_port *ap, struct ata_device *adev)
716{
717 struct arasan_cf_dev *acdev = ap->host->private_data;
718 u8 pio = adev->pio_mode - XFER_PIO_0;
719 unsigned long flags;
720 u32 val;
721
722 /* Arasan ctrl supports Mode0 -> Mode6 */
723 if (pio > 6) {
724 dev_err(ap->dev, "Unknown PIO mode\n");
725 return;
726 }
727
728 spin_lock_irqsave(&acdev->host->lock, flags);
729 val = readl(acdev->vbase + OP_MODE) &
730 ~(ULTRA_DMA_ENB | MULTI_WORD_DMA_ENB | DRQ_BLOCK_SIZE_MASK);
731 writel(val, acdev->vbase + OP_MODE);
732 val = readl(acdev->vbase + TM_CFG) & ~TRUEIDE_PIO_TIMING_MASK;
733 val |= pio << TRUEIDE_PIO_TIMING_SHIFT;
734 writel(val, acdev->vbase + TM_CFG);
735
736 cf_interrupt_enable(acdev, BUF_AVAIL_IRQ | XFER_DONE_IRQ, 0);
737 cf_interrupt_enable(acdev, PIO_XFER_ERR_IRQ, 1);
738 spin_unlock_irqrestore(&acdev->host->lock, flags);
739}
740
741static void arasan_cf_set_dmamode(struct ata_port *ap, struct ata_device *adev)
742{
743 struct arasan_cf_dev *acdev = ap->host->private_data;
744 u32 opmode, tmcfg, dma_mode = adev->dma_mode;
745 unsigned long flags;
746
747 spin_lock_irqsave(&acdev->host->lock, flags);
748 opmode = readl(acdev->vbase + OP_MODE) &
749 ~(MULTI_WORD_DMA_ENB | ULTRA_DMA_ENB);
750 tmcfg = readl(acdev->vbase + TM_CFG);
751
752 if ((dma_mode >= XFER_UDMA_0) && (dma_mode <= XFER_UDMA_6)) {
753 opmode |= ULTRA_DMA_ENB;
754 tmcfg &= ~ULTRA_DMA_TIMING_MASK;
755 tmcfg |= (dma_mode - XFER_UDMA_0) << ULTRA_DMA_TIMING_SHIFT;
756 } else if ((dma_mode >= XFER_MW_DMA_0) && (dma_mode <= XFER_MW_DMA_4)) {
757 opmode |= MULTI_WORD_DMA_ENB;
758 tmcfg &= ~TRUEIDE_MWORD_DMA_TIMING_MASK;
759 tmcfg |= (dma_mode - XFER_MW_DMA_0) <<
760 TRUEIDE_MWORD_DMA_TIMING_SHIFT;
761 } else {
762 dev_err(ap->dev, "Unknown DMA mode\n");
763 spin_unlock_irqrestore(&acdev->host->lock, flags);
764 return;
765 }
766
767 writel(opmode, acdev->vbase + OP_MODE);
768 writel(tmcfg, acdev->vbase + TM_CFG);
769 writel(DMA_XFER_MODE, acdev->vbase + XFER_CTR);
770
771 cf_interrupt_enable(acdev, PIO_XFER_ERR_IRQ, 0);
772 cf_interrupt_enable(acdev, BUF_AVAIL_IRQ | XFER_DONE_IRQ, 1);
773 spin_unlock_irqrestore(&acdev->host->lock, flags);
774}
775
776static struct ata_port_operations arasan_cf_ops = {
777 .inherits = &ata_sff_port_ops,
778 .freeze = arasan_cf_freeze,
779 .error_handler = arasan_cf_error_handler,
780 .qc_issue = arasan_cf_qc_issue,
781 .set_piomode = arasan_cf_set_piomode,
782 .set_dmamode = arasan_cf_set_dmamode,
783};
784
785static int __devinit arasan_cf_probe(struct platform_device *pdev)
786{
787 struct arasan_cf_dev *acdev;
788 struct arasan_cf_pdata *pdata = dev_get_platdata(&pdev->dev);
789 struct ata_host *host;
790 struct ata_port *ap;
791 struct resource *res;
792 irq_handler_t irq_handler = NULL;
793 int ret = 0;
794
795 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
796 if (!res)
797 return -EINVAL;
798
799 if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res),
800 DRIVER_NAME)) {
801 dev_warn(&pdev->dev, "Failed to get memory region resource\n");
802 return -ENOENT;
803 }
804
805 acdev = devm_kzalloc(&pdev->dev, sizeof(*acdev), GFP_KERNEL);
806 if (!acdev) {
807 dev_warn(&pdev->dev, "kzalloc fail\n");
808 return -ENOMEM;
809 }
810
811 /* if irq is 0, support only PIO */
812 acdev->irq = platform_get_irq(pdev, 0);
813 if (acdev->irq)
814 irq_handler = arasan_cf_interrupt;
815 else
816 pdata->quirk |= CF_BROKEN_MWDMA | CF_BROKEN_UDMA;
817
818 acdev->pbase = res->start;
819 acdev->vbase = devm_ioremap_nocache(&pdev->dev, res->start,
820 resource_size(res));
821 if (!acdev->vbase) {
822 dev_warn(&pdev->dev, "ioremap fail\n");
823 return -ENOMEM;
824 }
825
a480167b
VK		 826 acdev->clk = clk_get(&pdev->dev, NULL);
827 if (IS_ERR(acdev->clk)) {
828 dev_warn(&pdev->dev, "Clock not found\n");
829 return PTR_ERR(acdev->clk);
830 }
a480167b
VK		 831
832 /* allocate host */
833 host = ata_host_alloc(&pdev->dev, 1);
834 if (!host) {
835 ret = -ENOMEM;
836 dev_warn(&pdev->dev, "alloc host fail\n");
837 goto free_clk;
838 }
839
840 ap = host->ports[0];
841 host->private_data = acdev;
842 acdev->host = host;
843 ap->ops = &arasan_cf_ops;
844 ap->pio_mask = ATA_PIO6;
845 ap->mwdma_mask = ATA_MWDMA4;
846 ap->udma_mask = ATA_UDMA6;
847
848 init_completion(&acdev->cf_completion);
849 init_completion(&acdev->dma_completion);
850 INIT_WORK(&acdev->work, data_xfer);
851 INIT_DELAYED_WORK(&acdev->dwork, delayed_finish);
852 dma_cap_set(DMA_MEMCPY, acdev->mask);
60a230e4 853 acdev->dma_priv = pdata->dma_priv;
a480167b
VK		 854
855 /* Handle platform specific quirks */
856 if (pdata->quirk) {
857 if (pdata->quirk & CF_BROKEN_PIO) {
858 ap->ops->set_piomode = NULL;
859 ap->pio_mask = 0;
860 }
861 if (pdata->quirk & CF_BROKEN_MWDMA)
862 ap->mwdma_mask = 0;
863 if (pdata->quirk & CF_BROKEN_UDMA)
864 ap->udma_mask = 0;
865 }
866 ap->flags |= ATA_FLAG_PIO_POLLING | ATA_FLAG_NO_ATAPI;
867
868 ap->ioaddr.cmd_addr = acdev->vbase + ATA_DATA_PORT;
869 ap->ioaddr.data_addr = acdev->vbase + ATA_DATA_PORT;
870 ap->ioaddr.error_addr = acdev->vbase + ATA_ERR_FTR;
871 ap->ioaddr.feature_addr = acdev->vbase + ATA_ERR_FTR;
872 ap->ioaddr.nsect_addr = acdev->vbase + ATA_SC;
873 ap->ioaddr.lbal_addr = acdev->vbase + ATA_SN;
874 ap->ioaddr.lbam_addr = acdev->vbase + ATA_CL;
875 ap->ioaddr.lbah_addr = acdev->vbase + ATA_CH;
876 ap->ioaddr.device_addr = acdev->vbase + ATA_SH;
877 ap->ioaddr.status_addr = acdev->vbase + ATA_STS_CMD;
878 ap->ioaddr.command_addr = acdev->vbase + ATA_STS_CMD;
879 ap->ioaddr.altstatus_addr = acdev->vbase + ATA_ASTS_DCTR;
880 ap->ioaddr.ctl_addr = acdev->vbase + ATA_ASTS_DCTR;
881
a17139b6
JG		 882 ata_port_desc(ap, "phy_addr %llx virt_addr %p",
883 (unsigned long long) res->start, acdev->vbase);
a480167b
VK		 884
885 ret = cf_init(acdev);
886 if (ret)
887 goto free_clk;
888
889 cf_card_detect(acdev, 0);
890
891 return ata_host_activate(host, acdev->irq, irq_handler, 0,
892 &arasan_cf_sht);
893
894free_clk:
a480167b 895 clk_put(acdev->clk);
a480167b
VK		 896 return ret;
897}
898
899static int __devexit arasan_cf_remove(struct platform_device *pdev)
900{
901 struct ata_host *host = dev_get_drvdata(&pdev->dev);
902 struct arasan_cf_dev *acdev = host->ports[0]->private_data;
903
904 ata_host_detach(host);
905 cf_exit(acdev);
a480167b 906 clk_put(acdev->clk);
a480167b
VK		 907
908 return 0;
909}
910
911#ifdef CONFIG_PM
912static int arasan_cf_suspend(struct device *dev)
913{
90f0adf0 914 struct ata_host *host = dev_get_drvdata(dev);
a480167b
VK		 915 struct arasan_cf_dev *acdev = host->ports[0]->private_data;
916
40679b3c 917 if (acdev->dma_chan)
a480167b
VK		 918 acdev->dma_chan->device->device_control(acdev->dma_chan,
919 DMA_TERMINATE_ALL, 0);
40679b3c 920
a480167b
VK		 921 cf_exit(acdev);
922 return ata_host_suspend(host, PMSG_SUSPEND);
923}
924
925static int arasan_cf_resume(struct device *dev)
926{
90f0adf0 927 struct ata_host *host = dev_get_drvdata(dev);
a480167b
VK		 928 struct arasan_cf_dev *acdev = host->ports[0]->private_data;
929
930 cf_init(acdev);
931 ata_host_resume(host);
932
933 return 0;
934}
fb9751d4 935#endif
a480167b 936
40679b3c 937static SIMPLE_DEV_PM_OPS(arasan_cf_pm_ops, arasan_cf_suspend, arasan_cf_resume);
a480167b 938
26fdaa74
VK		 939#ifdef CONFIG_OF
940static const struct of_device_id arasan_cf_id_table[] = {
941 { .compatible = "arasan,cf-spear1340" },
942 {}
943};
944MODULE_DEVICE_TABLE(of, arasan_cf_id_table);
945#endif
946
a480167b
VK		 947static struct platform_driver arasan_cf_driver = {
948 .probe = arasan_cf_probe,
949 .remove = __devexit_p(arasan_cf_remove),
950 .driver = {
951 .name = DRIVER_NAME,
952 .owner = THIS_MODULE,
40679b3c 953 .pm = &arasan_cf_pm_ops,
26fdaa74 954 .of_match_table = of_match_ptr(arasan_cf_id_table),
a480167b
VK		 955 },
956};
957
99c8ea3e 958module_platform_driver(arasan_cf_driver);
a480167b 959
10d8935f 960MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>");
a480167b
VK		 961MODULE_DESCRIPTION("Arasan ATA Compact Flash driver");
962MODULE_LICENSE("GPL");
963MODULE_ALIAS("platform:" DRIVER_NAME);
kernel source for telekom puls (alcatel/mediatek)