ufshcd.c 147 KB
Newer Older
1
/*
2
 * Universal Flash Storage Host controller driver Core
3
4
 *
 * This code is based on drivers/scsi/ufs/ufshcd.c
5
 * Copyright (C) 2011-2013 Samsung India Software Operations
6
 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
7
 *
8
9
10
 * Authors:
 *	Santosh Yaraganavi <santosh.sy@samsung.com>
 *	Vinayak Holikatti <h.vinayak@samsung.com>
11
12
13
14
15
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
16
17
 * See the COPYING file in the top-level directory or visit
 * <http://www.gnu.org/licenses/gpl-2.0.html>
18
19
20
21
22
23
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
24
25
26
27
28
29
30
31
32
33
34
 * This program is provided "AS IS" and "WITH ALL FAULTS" and
 * without warranty of any kind. You are solely responsible for
 * determining the appropriateness of using and distributing
 * the program and assume all risks associated with your exercise
 * of rights with respect to the program, including but not limited
 * to infringement of third party rights, the risks and costs of
 * program errors, damage to or loss of data, programs or equipment,
 * and unavailability or interruption of operations. Under no
 * circumstances will the contributor of this Program be liable for
 * any damages of any kind arising from your use or distribution of
 * this program.
35
36
37
 *
 * The Linux Foundation chooses to take subject only to the GPLv2
 * license terms, and distributes only under these terms.
38
39
 */

40
#include <linux/async.h>
41
#include <linux/devfreq.h>
42

43
#include "ufshcd.h"
44
#include "unipro.h"
45

46
47
48
#define UFSHCD_ENABLE_INTRS	(UTP_TRANSFER_REQ_COMPL |\
				 UTP_TASK_REQ_COMPL |\
				 UFSHCD_ERROR_MASK)
49
50
/* UIC command timeout, unit: ms */
#define UIC_CMD_TIMEOUT	500
51

52
53
54
55
56
/* NOP OUT retries waiting for NOP IN response */
#define NOP_OUT_RETRIES    10
/* Timeout after 30 msecs if NOP OUT hangs without response */
#define NOP_OUT_TIMEOUT    30 /* msecs */

57
58
59
60
61
/* Query request retries */
#define QUERY_REQ_RETRIES 10
/* Query request timeout */
#define QUERY_REQ_TIMEOUT 30 /* msec */

62
63
64
/* Task management command timeout */
#define TM_CMD_TIMEOUT	100 /* msecs */

65
66
67
68
69
70
/* maximum number of link-startup retries */
#define DME_LINKSTARTUP_RETRIES 3

/* maximum number of reset retries before giving up */
#define MAX_HOST_RESET_RETRIES 5

71
72
73
/* Expose the flag value from utp_upiu_query.value */
#define MASK_QUERY_UPIU_FLAG_LOC 0xFF

74
75
76
/* Interrupt aggregation default timeout, unit: 40us */
#define INT_AGGR_DEF_TO	0x02

77
78
79
80
81
82
83
84
85
86
#define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
	({                                                              \
		int _ret;                                               \
		if (_on)                                                \
			_ret = ufshcd_enable_vreg(_dev, _vreg);         \
		else                                                    \
			_ret = ufshcd_disable_vreg(_dev, _vreg);        \
		_ret;                                                   \
	})

87
88
89
90
91
92
93
94
95
96
97
98
99
static u32 ufs_query_desc_max_size[] = {
	QUERY_DESC_DEVICE_MAX_SIZE,
	QUERY_DESC_CONFIGURAION_MAX_SIZE,
	QUERY_DESC_UNIT_MAX_SIZE,
	QUERY_DESC_RFU_MAX_SIZE,
	QUERY_DESC_INTERCONNECT_MAX_SIZE,
	QUERY_DESC_STRING_MAX_SIZE,
	QUERY_DESC_RFU_MAX_SIZE,
	QUERY_DESC_GEOMETRY_MAZ_SIZE,
	QUERY_DESC_POWER_MAX_SIZE,
	QUERY_DESC_RFU_MAX_SIZE,
};

100
101
102
103
104
105
106
107
108
109
110
enum {
	UFSHCD_MAX_CHANNEL	= 0,
	UFSHCD_MAX_ID		= 1,
	UFSHCD_CMD_PER_LUN	= 32,
	UFSHCD_CAN_QUEUE	= 32,
};

/* UFSHCD states */
enum {
	UFSHCD_STATE_RESET,
	UFSHCD_STATE_ERROR,
111
112
113
114
115
116
	UFSHCD_STATE_OPERATIONAL,
};

/* UFSHCD error handling flags */
enum {
	UFSHCD_EH_IN_PROGRESS = (1 << 0),
117
118
};

119
120
121
122
123
124
125
126
/* UFSHCD UIC layer error flags */
enum {
	UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
	UFSHCD_UIC_NL_ERROR = (1 << 1), /* Network layer error */
	UFSHCD_UIC_TL_ERROR = (1 << 2), /* Transport Layer error */
	UFSHCD_UIC_DME_ERROR = (1 << 3), /* DME error */
};

127
128
129
130
131
132
133
/* Interrupt configuration options */
enum {
	UFSHCD_INT_DISABLE,
	UFSHCD_INT_ENABLE,
	UFSHCD_INT_CLEAR,
};

134
135
136
137
138
139
140
#define ufshcd_set_eh_in_progress(h) \
	(h->eh_flags |= UFSHCD_EH_IN_PROGRESS)
#define ufshcd_eh_in_progress(h) \
	(h->eh_flags & UFSHCD_EH_IN_PROGRESS)
#define ufshcd_clear_eh_in_progress(h) \
	(h->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)

141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
#define ufshcd_set_ufs_dev_active(h) \
	((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
#define ufshcd_set_ufs_dev_sleep(h) \
	((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
#define ufshcd_set_ufs_dev_poweroff(h) \
	((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
#define ufshcd_is_ufs_dev_active(h) \
	((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
#define ufshcd_is_ufs_dev_sleep(h) \
	((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
#define ufshcd_is_ufs_dev_poweroff(h) \
	((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)

static struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
	{UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	{UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	{UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
};

static inline enum ufs_dev_pwr_mode
ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].dev_state;
}

static inline enum uic_link_state
ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].link_state;
}

175
176
static void ufshcd_tmc_handler(struct ufs_hba *hba);
static void ufshcd_async_scan(void *data, async_cookie_t cookie);
177
178
static int ufshcd_reset_and_restore(struct ufs_hba *hba);
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
179
180
static void ufshcd_hba_exit(struct ufs_hba *hba);
static int ufshcd_probe_hba(struct ufs_hba *hba);
181
182
183
184
185
static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
				 bool skip_ref_clk);
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
186
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
187
188
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
static irqreturn_t ufshcd_intr(int irq, void *__hba);
189
190
static int ufshcd_config_pwr_mode(struct ufs_hba *hba,
		struct ufs_pa_layer_attr *desired_pwr_mode);
191
192
static int ufshcd_change_power_mode(struct ufs_hba *hba,
			     struct ufs_pa_layer_attr *pwr_mode);
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216

static inline int ufshcd_enable_irq(struct ufs_hba *hba)
{
	int ret = 0;

	if (!hba->is_irq_enabled) {
		ret = request_irq(hba->irq, ufshcd_intr, IRQF_SHARED, UFSHCD,
				hba);
		if (ret)
			dev_err(hba->dev, "%s: request_irq failed, ret=%d\n",
				__func__, ret);
		hba->is_irq_enabled = true;
	}

	return ret;
}

static inline void ufshcd_disable_irq(struct ufs_hba *hba)
{
	if (hba->is_irq_enabled) {
		free_irq(hba->irq, hba);
		hba->is_irq_enabled = false;
	}
}
217

218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
/*
 * ufshcd_wait_for_register - wait for register value to change
 * @hba - per-adapter interface
 * @reg - mmio register offset
 * @mask - mask to apply to read register value
 * @val - wait condition
 * @interval_us - polling interval in microsecs
 * @timeout_ms - timeout in millisecs
 *
 * Returns -ETIMEDOUT on error, zero on success
 */
static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
		u32 val, unsigned long interval_us, unsigned long timeout_ms)
{
	int err = 0;
	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);

	/* ignore bits that we don't intend to wait on */
	val = val & mask;

	while ((ufshcd_readl(hba, reg) & mask) != val) {
		/* wakeup within 50us of expiry */
		usleep_range(interval_us, interval_us + 50);

		if (time_after(jiffies, timeout)) {
			if ((ufshcd_readl(hba, reg) & mask) != val)
				err = -ETIMEDOUT;
			break;
		}
	}

	return err;
}

252
253
254
255
256
257
258
259
260
261
262
263
264
265
/**
 * ufshcd_get_intr_mask - Get the interrupt bit mask
 * @hba - Pointer to adapter instance
 *
 * Returns interrupt bit mask per version
 */
static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
{
	if (hba->ufs_version == UFSHCI_VERSION_10)
		return INTERRUPT_MASK_ALL_VER_10;
	else
		return INTERRUPT_MASK_ALL_VER_11;
}

266
267
268
269
270
271
272
273
/**
 * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
 * @hba - Pointer to adapter instance
 *
 * Returns UFSHCI version supported by the controller
 */
static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
{
274
275
	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION)
		return ufshcd_vops_get_ufs_hci_version(hba);
276

277
	return ufshcd_readl(hba, REG_UFS_VERSION);
278
279
280
281
282
}

/**
 * ufshcd_is_device_present - Check if any device connected to
 *			      the host controller
283
 * @hba: pointer to adapter instance
284
 *
285
 * Returns 1 if device present, 0 if no device detected
286
 */
287
static inline int ufshcd_is_device_present(struct ufs_hba *hba)
288
{
289
290
	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
						DEVICE_PRESENT) ? 1 : 0;
291
292
293
294
295
296
297
298
299
300
301
}

/**
 * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
 * @lrb: pointer to local command reference block
 *
 * This function is used to get the OCS field from UTRD
 * Returns the OCS field in the UTRD
 */
static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
{
302
	return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
303
304
305
306
307
308
309
310
311
312
313
314
}

/**
 * ufshcd_get_tmr_ocs - Get the UTMRD Overall Command Status
 * @task_req_descp: pointer to utp_task_req_desc structure
 *
 * This function is used to get the OCS field from UTMRD
 * Returns the OCS field in the UTMRD
 */
static inline int
ufshcd_get_tmr_ocs(struct utp_task_req_desc *task_req_descp)
{
315
	return le32_to_cpu(task_req_descp->header.dword_2) & MASK_OCS;
316
317
318
319
320
}

/**
 * ufshcd_get_tm_free_slot - get a free slot for task management request
 * @hba: per adapter instance
321
 * @free_slot: pointer to variable with available slot value
322
 *
323
324
325
 * Get a free tag and lock it until ufshcd_put_tm_slot() is called.
 * Returns 0 if free slot is not available, else return 1 with tag value
 * in @free_slot.
326
 */
327
static bool ufshcd_get_tm_free_slot(struct ufs_hba *hba, int *free_slot)
328
{
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
	int tag;
	bool ret = false;

	if (!free_slot)
		goto out;

	do {
		tag = find_first_zero_bit(&hba->tm_slots_in_use, hba->nutmrs);
		if (tag >= hba->nutmrs)
			goto out;
	} while (test_and_set_bit_lock(tag, &hba->tm_slots_in_use));

	*free_slot = tag;
	ret = true;
out:
	return ret;
}

static inline void ufshcd_put_tm_slot(struct ufs_hba *hba, int slot)
{
	clear_bit_unlock(slot, &hba->tm_slots_in_use);
350
351
352
353
354
355
356
357
358
}

/**
 * ufshcd_utrl_clear - Clear a bit in UTRLCLR register
 * @hba: per adapter instance
 * @pos: position of the bit to be cleared
 */
static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
{
359
	ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
}

/**
 * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
 * @reg: Register value of host controller status
 *
 * Returns integer, 0 on Success and positive value if failed
 */
static inline int ufshcd_get_lists_status(u32 reg)
{
	/*
	 * The mask 0xFF is for the following HCS register bits
	 * Bit		Description
	 *  0		Device Present
	 *  1		UTRLRDY
	 *  2		UTMRLRDY
	 *  3		UCRDY
	 *  4		HEI
	 *  5		DEI
	 * 6-7		reserved
	 */
	return (((reg) & (0xFF)) >> 1) ^ (0x07);
}

/**
 * ufshcd_get_uic_cmd_result - Get the UIC command result
 * @hba: Pointer to adapter instance
 *
 * This function gets the result of UIC command completion
 * Returns 0 on success, non zero value on error
 */
static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
{
393
	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
394
395
396
	       MASK_UIC_COMMAND_RESULT;
}

397
398
399
400
401
402
403
404
405
406
407
408
/**
 * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
 * @hba: Pointer to adapter instance
 *
 * This function gets UIC command argument3
 * Returns 0 on success, non zero value on error
 */
static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
{
	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
}

409
/**
410
 * ufshcd_get_req_rsp - returns the TR response transaction type
411
412
413
 * @ucd_rsp_ptr: pointer to response UPIU
 */
static inline int
414
ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
415
{
416
	return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
}

/**
 * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * This function gets the response status and scsi_status from response UPIU
 * Returns the response result code.
 */
static inline int
ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
}

432
433
434
435
436
437
438
439
440
441
442
443
444
445
/*
 * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
 *				from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * Return the data segment length.
 */
static inline unsigned int
ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
		MASK_RSP_UPIU_DATA_SEG_LEN;
}

446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
/**
 * ufshcd_is_exception_event - Check if the device raised an exception event
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * The function checks if the device raised an exception event indicated in
 * the Device Information field of response UPIU.
 *
 * Returns true if exception is raised, false otherwise.
 */
static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
			MASK_RSP_EXCEPTION_EVENT ? true : false;
}

461
/**
462
 * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
463
464
465
 * @hba: per adapter instance
 */
static inline void
466
ufshcd_reset_intr_aggr(struct ufs_hba *hba)
467
{
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
	ufshcd_writel(hba, INT_AGGR_ENABLE |
		      INT_AGGR_COUNTER_AND_TIMER_RESET,
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
 * @hba: per adapter instance
 * @cnt: Interrupt aggregation counter threshold
 * @tmout: Interrupt aggregation timeout value
 */
static inline void
ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
{
	ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
		      INT_AGGR_COUNTER_THLD_VAL(cnt) |
		      INT_AGGR_TIMEOUT_VAL(tmout),
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
486
487
}

488
489
490
491
492
493
494
495
496
/**
 * ufshcd_disable_intr_aggr - Disables interrupt aggregation.
 * @hba: per adapter instance
 */
static inline void ufshcd_disable_intr_aggr(struct ufs_hba *hba)
{
	ufshcd_writel(hba, 0, REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

497
498
499
500
501
502
503
504
/**
 * ufshcd_enable_run_stop_reg - Enable run-stop registers,
 *			When run-stop registers are set to 1, it indicates the
 *			host controller that it can process the requests
 * @hba: per adapter instance
 */
static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
{
505
506
507
508
	ufshcd_writel(hba, UTP_TASK_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TASK_REQ_LIST_RUN_STOP);
	ufshcd_writel(hba, UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TRANSFER_REQ_LIST_RUN_STOP);
509
510
511
512
513
514
515
516
}

/**
 * ufshcd_hba_start - Start controller initialization sequence
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_start(struct ufs_hba *hba)
{
517
	ufshcd_writel(hba, CONTROLLER_ENABLE, REG_CONTROLLER_ENABLE);
518
519
520
521
522
523
524
525
526
527
}

/**
 * ufshcd_is_hba_active - Get controller state
 * @hba: per adapter instance
 *
 * Returns zero if controller is active, 1 otherwise
 */
static inline int ufshcd_is_hba_active(struct ufs_hba *hba)
{
528
	return (ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & 0x1) ? 0 : 1;
529
530
}

531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
static void ufshcd_ungate_work(struct work_struct *work)
{
	int ret;
	unsigned long flags;
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.ungate_work);

	cancel_delayed_work_sync(&hba->clk_gating.gate_work);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == CLKS_ON) {
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		goto unblock_reqs;
	}

	spin_unlock_irqrestore(hba->host->host_lock, flags);
	ufshcd_setup_clocks(hba, true);

	/* Exit from hibern8 */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		/* Prevent gating in this path */
		hba->clk_gating.is_suspended = true;
		if (ufshcd_is_link_hibern8(hba)) {
			ret = ufshcd_uic_hibern8_exit(hba);
			if (ret)
				dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
					__func__, ret);
			else
				ufshcd_set_link_active(hba);
		}
		hba->clk_gating.is_suspended = false;
	}
unblock_reqs:
564
565
	if (ufshcd_is_clkscaling_enabled(hba))
		devfreq_resume_device(hba->devfreq);
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
	scsi_unblock_requests(hba->host);
}

/**
 * ufshcd_hold - Enable clocks that were gated earlier due to ufshcd_release.
 * Also, exit from hibern8 mode and set the link as active.
 * @hba: per adapter instance
 * @async: This indicates whether caller should ungate clocks asynchronously.
 */
int ufshcd_hold(struct ufs_hba *hba, bool async)
{
	int rc = 0;
	unsigned long flags;

	if (!ufshcd_is_clkgating_allowed(hba))
		goto out;
	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.active_reqs++;

585
start:
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
	switch (hba->clk_gating.state) {
	case CLKS_ON:
		break;
	case REQ_CLKS_OFF:
		if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
			hba->clk_gating.state = CLKS_ON;
			break;
		}
		/*
		 * If we here, it means gating work is either done or
		 * currently running. Hence, fall through to cancel gating
		 * work and to enable clocks.
		 */
	case CLKS_OFF:
		scsi_block_requests(hba->host);
		hba->clk_gating.state = REQ_CLKS_ON;
		schedule_work(&hba->clk_gating.ungate_work);
		/*
		 * fall through to check if we should wait for this
		 * work to be done or not.
		 */
	case REQ_CLKS_ON:
		if (async) {
			rc = -EAGAIN;
			hba->clk_gating.active_reqs--;
			break;
		}

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		flush_work(&hba->clk_gating.ungate_work);
		/* Make sure state is CLKS_ON before returning */
617
		spin_lock_irqsave(hba->host->host_lock, flags);
618
619
620
621
622
623
624
625
626
627
		goto start;
	default:
		dev_err(hba->dev, "%s: clk gating is in invalid state %d\n",
				__func__, hba->clk_gating.state);
		break;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return rc;
}
628
EXPORT_SYMBOL_GPL(ufshcd_hold);
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658

static void ufshcd_gate_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.gate_work.work);
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.is_suspended) {
		hba->clk_gating.state = CLKS_ON;
		goto rel_lock;
	}

	if (hba->clk_gating.active_reqs
		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
		|| hba->lrb_in_use || hba->outstanding_tasks
		|| hba->active_uic_cmd || hba->uic_async_done)
		goto rel_lock;

	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* put the link into hibern8 mode before turning off clocks */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		if (ufshcd_uic_hibern8_enter(hba)) {
			hba->clk_gating.state = CLKS_ON;
			goto out;
		}
		ufshcd_set_link_hibern8(hba);
	}

659
660
661
662
663
	if (ufshcd_is_clkscaling_enabled(hba)) {
		devfreq_suspend_device(hba->devfreq);
		hba->clk_scaling.window_start_t = 0;
	}

664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
	if (!ufshcd_is_link_active(hba))
		ufshcd_setup_clocks(hba, false);
	else
		/* If link is active, device ref_clk can't be switched off */
		__ufshcd_setup_clocks(hba, false, true);

	/*
	 * In case you are here to cancel this work the gating state
	 * would be marked as REQ_CLKS_ON. In this case keep the state
	 * as REQ_CLKS_ON which would anyway imply that clocks are off
	 * and a request to turn them on is pending. By doing this way,
	 * we keep the state machine in tact and this would ultimately
	 * prevent from doing cancel work multiple times when there are
	 * new requests arriving before the current cancel work is done.
	 */
	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == REQ_CLKS_OFF)
		hba->clk_gating.state = CLKS_OFF;

rel_lock:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return;
}

/* host lock must be held before calling this variant */
static void __ufshcd_release(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.active_reqs--;

	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended
		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
		|| hba->lrb_in_use || hba->outstanding_tasks
		|| hba->active_uic_cmd || hba->uic_async_done)
		return;

	hba->clk_gating.state = REQ_CLKS_OFF;
	schedule_delayed_work(&hba->clk_gating.gate_work,
			msecs_to_jiffies(hba->clk_gating.delay_ms));
}

void ufshcd_release(struct ufs_hba *hba)
{
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	__ufshcd_release(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}
716
EXPORT_SYMBOL_GPL(ufshcd_release);
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763

static ssize_t ufshcd_clkgate_delay_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%lu\n", hba->clk_gating.delay_ms);
}

static ssize_t ufshcd_clkgate_delay_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	unsigned long flags, value;

	if (kstrtoul(buf, 0, &value))
		return -EINVAL;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.delay_ms = value;
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return count;
}

static void ufshcd_init_clk_gating(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.delay_ms = 150;
	INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work);
	INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work);

	hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
	hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
	sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
	hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
	hba->clk_gating.delay_attr.attr.mode = S_IRUGO | S_IWUSR;
	if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");
}

static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;
	device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
764
765
	cancel_work_sync(&hba->clk_gating.ungate_work);
	cancel_delayed_work_sync(&hba->clk_gating.gate_work);
766
767
}

768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
/* Must be called with host lock acquired */
static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkscaling_enabled(hba))
		return;

	if (!hba->clk_scaling.is_busy_started) {
		hba->clk_scaling.busy_start_t = ktime_get();
		hba->clk_scaling.is_busy_started = true;
	}
}

static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
{
	struct ufs_clk_scaling *scaling = &hba->clk_scaling;

	if (!ufshcd_is_clkscaling_enabled(hba))
		return;

	if (!hba->outstanding_reqs && scaling->is_busy_started) {
		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
					scaling->busy_start_t));
		scaling->busy_start_t = ktime_set(0, 0);
		scaling->is_busy_started = false;
	}
}
794
795
796
797
798
799
800
801
/**
 * ufshcd_send_command - Send SCSI or device management commands
 * @hba: per adapter instance
 * @task_tag: Task tag of the command
 */
static inline
void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
{
802
	ufshcd_clk_scaling_start_busy(hba);
803
	__set_bit(task_tag, &hba->outstanding_reqs);
804
	ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
805
806
807
808
809
810
811
812
813
}

/**
 * ufshcd_copy_sense_data - Copy sense data in case of check condition
 * @lrb - pointer to local reference block
 */
static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
{
	int len;
814
815
	if (lrbp->sense_buffer &&
	    ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
816
817
		int len_to_copy;

818
		len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
819
820
		len_to_copy = min_t(int, RESPONSE_UPIU_SENSE_DATA_LENGTH, len);

821
		memcpy(lrbp->sense_buffer,
822
			lrbp->ucd_rsp_ptr->sr.sense_data,
823
			min_t(int, len_to_copy, SCSI_SENSE_BUFFERSIZE));
824
825
826
	}
}

827
828
829
830
831
832
833
/**
 * ufshcd_copy_query_response() - Copy the Query Response and the data
 * descriptor
 * @hba: per adapter instance
 * @lrb - pointer to local reference block
 */
static
834
int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
835
836
837
838
839
840
841
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);

	/* Get the descriptor */
	if (lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
Dolev Raviv's avatar
Dolev Raviv committed
842
		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
843
				GENERAL_UPIU_REQUEST_SIZE;
844
845
		u16 resp_len;
		u16 buf_len;
846
847

		/* data segment length */
848
		resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
849
						MASK_QUERY_DATA_SEG_LEN;
850
851
		buf_len = be16_to_cpu(
				hba->dev_cmd.query.request.upiu_req.length);
852
853
854
855
856
857
858
859
		if (likely(buf_len >= resp_len)) {
			memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
		} else {
			dev_warn(hba->dev,
				"%s: Response size is bigger than buffer",
				__func__);
			return -EINVAL;
		}
860
	}
861
862

	return 0;
863
864
}

865
866
867
868
869
870
/**
 * ufshcd_hba_capabilities - Read controller capabilities
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_capabilities(struct ufs_hba *hba)
{
871
	hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);
872
873
874
875
876
877
878
879

	/* nutrs and nutmrs are 0 based values */
	hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
	hba->nutmrs =
	((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
}

/**
880
881
 * ufshcd_ready_for_uic_cmd - Check if controller is ready
 *                            to accept UIC commands
882
 * @hba: per adapter instance
883
884
885
886
887
888
889
890
891
892
 * Return true on success, else false
 */
static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
{
	if (ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY)
		return true;
	else
		return false;
}

893
894
895
896
897
898
899
900
901
902
903
904
/**
 * ufshcd_get_upmcrs - Get the power mode change request status
 * @hba: Pointer to adapter instance
 *
 * This function gets the UPMCRS field of HCS register
 * Returns value of UPMCRS field
 */
static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) >> 8) & 0x7;
}

905
906
907
908
909
910
/**
 * ufshcd_dispatch_uic_cmd - Dispatch UIC commands to unipro layers
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Mutex must be held.
911
912
 */
static inline void
913
ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
914
{
915
916
917
918
	WARN_ON(hba->active_uic_cmd);

	hba->active_uic_cmd = uic_cmd;

919
	/* Write Args */
920
921
922
	ufshcd_writel(hba, uic_cmd->argument1, REG_UIC_COMMAND_ARG_1);
	ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
	ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);
923
924

	/* Write UIC Cmd */
925
	ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
926
		      REG_UIC_COMMAND);
927
928
}

929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
/**
 * ufshcd_wait_for_uic_cmd - Wait complectioin of UIC command
 * @hba: per adapter instance
 * @uic_command: UIC command
 *
 * Must be called with mutex held.
 * Returns 0 only if success.
 */
static int
ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
	unsigned long flags;

	if (wait_for_completion_timeout(&uic_cmd->done,
					msecs_to_jiffies(UIC_CMD_TIMEOUT)))
		ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
	else
		ret = -ETIMEDOUT;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->active_uic_cmd = NULL;
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	return ret;
}

/**
 * __ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Identical to ufshcd_send_uic_cmd() expect mutex. Must be called
962
 * with mutex held and host_lock locked.
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
 * Returns 0 only if success.
 */
static int
__ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	if (!ufshcd_ready_for_uic_cmd(hba)) {
		dev_err(hba->dev,
			"Controller not ready to accept UIC commands\n");
		return -EIO;
	}

	init_completion(&uic_cmd->done);

	ufshcd_dispatch_uic_cmd(hba, uic_cmd);

978
	return 0;
979
980
981
982
983
984
985
986
987
988
989
990
991
}

/**
 * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Returns 0 only if success.
 */
static int
ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
992
	unsigned long flags;
993

994
	ufshcd_hold(hba, false);
995
	mutex_lock(&hba->uic_cmd_mutex);
996
997
	ufshcd_add_delay_before_dme_cmd(hba);

998
	spin_lock_irqsave(hba->host->host_lock, flags);
999
	ret = __ufshcd_send_uic_cmd(hba, uic_cmd);
1000
1001
1002
1003
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	if (!ret)
		ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);

1004
1005
	mutex_unlock(&hba->uic_cmd_mutex);

1006
	ufshcd_release(hba);
1007
1008
1009
	return ret;
}

1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
/**
 * ufshcd_map_sg - Map scatter-gather list to prdt
 * @lrbp - pointer to local reference block
 *
 * Returns 0 in case of success, non-zero value in case of failure
 */
static int ufshcd_map_sg(struct ufshcd_lrb *lrbp)
{
	struct ufshcd_sg_entry *prd_table;
	struct scatterlist *sg;
	struct scsi_cmnd *cmd;
	int sg_segments;
	int i;

	cmd = lrbp->cmd;
	sg_segments = scsi_dma_map(cmd);
	if (sg_segments < 0)
		return sg_segments;

	if (sg_segments) {
		lrbp->utr_descriptor_ptr->prd_table_length =
					cpu_to_le16((u16) (sg_segments));

		prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;

		scsi_for_each_sg(cmd, sg, sg_segments, i) {
			prd_table[i].size  =
				cpu_to_le32(((u32) sg_dma_len(sg))-1);
			prd_table[i].base_addr =
				cpu_to_le32(lower_32_bits(sg->dma_address));
			prd_table[i].upper_addr =
				cpu_to_le32(upper_32_bits(sg->dma_address));
		}
	} else {
		lrbp->utr_descriptor_ptr->prd_table_length = 0;
	}

	return 0;
}

/**
1051
 * ufshcd_enable_intr - enable interrupts
1052
 * @hba: per adapter instance
1053
 * @intrs: interrupt bits
1054
 */
1055
static void ufshcd_enable_intr(struct ufs_hba *hba, u32 intrs)
1056
{
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == UFSHCI_VERSION_10) {
		u32 rw;
		rw = set & INTERRUPT_MASK_RW_VER_10;
		set = rw | ((set ^ intrs) & intrs);
	} else {
		set |= intrs;
	}

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_disable_intr - disable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
{
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == UFSHCI_VERSION_10) {
		u32 rw;
		rw = (set & INTERRUPT_MASK_RW_VER_10) &
			~(intrs & INTERRUPT_MASK_RW_VER_10);
		set = rw | ((set & intrs) & ~INTERRUPT_MASK_RW_VER_10);

	} else {
		set &= ~intrs;
1087
	}
1088
1089

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
1090
1091
}

1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
/**
 * ufshcd_prepare_req_desc_hdr() - Fills the requests header
 * descriptor according to request
 * @lrbp: pointer to local reference block
 * @upiu_flags: flags required in the header
 * @cmd_dir: requests data direction
 */
static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
		u32 *upiu_flags, enum dma_data_direction cmd_dir)
{
	struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
	u32 data_direction;
	u32 dword_0;

	if (cmd_dir == DMA_FROM_DEVICE) {
		data_direction = UTP_DEVICE_TO_HOST;
		*upiu_flags = UPIU_CMD_FLAGS_READ;
	} else if (cmd_dir == DMA_TO_DEVICE) {
		data_direction = UTP_HOST_TO_DEVICE;
		*upiu_flags = UPIU_CMD_FLAGS_WRITE;
	} else {
		data_direction = UTP_NO_DATA_TRANSFER;
		*upiu_flags = UPIU_CMD_FLAGS_NONE;
	}

	dword_0 = data_direction | (lrbp->command_type
				<< UPIU_COMMAND_TYPE_OFFSET);
	if (lrbp->intr_cmd)
		dword_0 |= UTP_REQ_DESC_INT_CMD;

	/* Transfer request descriptor header fields */
	req_desc->header.dword_0 = cpu_to_le32(dword_0);

	/*
	 * assigning invalid value for command status. Controller
	 * updates OCS on command completion, with the command
	 * status
	 */
	req_desc->header.dword_2 =
		cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
}

/**
 * ufshcd_prepare_utp_scsi_cmd_upiu() - fills the utp_transfer_req_desc,
 * for scsi commands
 * @lrbp - local reference block pointer
 * @upiu_flags - flags
 */
static
void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u32 upiu_flags)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
				UPIU_TRANSACTION_COMMAND, upiu_flags,
				lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);

	/* Total EHS length and Data segment length will be zero */
	ucd_req_ptr->header.dword_2 = 0;

	ucd_req_ptr->sc.exp_data_transfer_len =
		cpu_to_be32(lrbp->cmd->sdb.length);

	memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd,
		(min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE)));
}

1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
/**
 * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
 * for query requsts
 * @hba: UFS hba
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
				struct ufshcd_lrb *lrbp, u32 upiu_flags)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
	struct ufs_query *query = &hba->dev_cmd.query;
1174
	u16 len = be16_to_cpu(query->request.upiu_req.length);
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
	u8 *descp = (u8 *)lrbp->ucd_req_ptr + GENERAL_UPIU_REQUEST_SIZE;

	/* Query request header */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_QUERY_REQ, upiu_flags,
			lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
			0, query->request.query_func, 0, 0);

	/* Data segment length */
	ucd_req_ptr->header.dword_2 = UPIU_HEADER_DWORD(
			0, 0, len >> 8, (u8)len);

	/* Copy the Query Request buffer as is */
	memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
			QUERY_OSF_SIZE);

	/* Copy the Descriptor */
1193
1194
1195
	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
		memcpy(descp, query->descriptor, len);

1196
1197
}

1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;

	memset(ucd_req_ptr, 0, sizeof(struct utp_upiu_req));

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 =
		UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag);
}

1210
1211
/**
 * ufshcd_compose_upiu - form UFS Protocol Information Unit(UPIU)
1212
 * @hba - per adapter instance
1213
1214
 * @lrb - pointer to local reference block
 */
1215
static int ufshcd_compose_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
1216
1217
{
	u32 upiu_flags;
1218
	int ret = 0;
1219
1220
1221

	switch (lrbp->command_type) {
	case UTP_CMD_TYPE_SCSI:
1222
1223
1224
1225
		if (likely(lrbp->cmd)) {
			ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
					lrbp->cmd->sc_data_direction);
			ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
1226
		} else {
1227
			ret = -EINVAL;
1228
1229
1230
		}
		break;
	case UTP_CMD_TYPE_DEV_MANAGE:
1231
		ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
1232
1233
1234
1235
		if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
			ufshcd_prepare_utp_query_req_upiu(
					hba, lrbp, upiu_flags);
		else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP)
1236
1237
1238
			ufshcd_prepare_utp_nop_upiu(lrbp);
		else
			ret = -EINVAL;
1239
1240
1241
		break;
	case UTP_CMD_TYPE_UFS:
		/* For UFS native command implementation */
1242
1243
1244
1245
1246
1247
1248
1249
		ret = -ENOTSUPP;
		dev_err(hba->dev, "%s: UFS native command are not supported\n",
			__func__);
		break;
	default:
		ret = -ENOTSUPP;
		dev_err(hba->dev, "%s: unknown command type: 0x%x\n",
				__func__, lrbp->command_type);
1250
1251
		break;
	} /* end of switch */
1252
1253

	return ret;
1254
1255
}

1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
/*
 * ufshcd_scsi_to_upiu_lun - maps scsi LUN to UPIU LUN
 * @scsi_lun: scsi LUN id
 *
 * Returns UPIU LUN id
 */
static inline u8 ufshcd_scsi_to_upiu_lun(unsigned int scsi_lun)
{
	if (scsi_is_wlun(scsi_lun))
		return (scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID)
			| UFS_UPIU_WLUN_ID;
	else
		return scsi_lun & UFS_UPIU_MAX_UNIT_NUM_ID;
}

1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
/**
 * ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
 * @scsi_lun: UPIU W-LUN id
 *
 * Returns SCSI W-LUN id
 */
static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
{
	return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
}

1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
/**
 * ufshcd_queuecommand - main entry point for SCSI requests
 * @cmd: command from SCSI Midlayer
 * @done: call back function
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
{
	struct ufshcd_lrb *lrbp;
	struct ufs_hba *hba;
	unsigned long flags;
	int tag;
	int err = 0;

	hba = shost_priv(host);

	tag = cmd->request->tag;

1301
1302
1303
1304
1305
	spin_lock_irqsave(hba->host->host_lock, flags);
	switch (hba->ufshcd_state) {
	case UFSHCD_STATE_OPERATIONAL:
		break;
	case UFSHCD_STATE_RESET:
1306
		err = SCSI_MLQUEUE_HOST_BUSY;
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
		goto out_unlock;
	case UFSHCD_STATE_ERROR:
		set_host_byte(cmd, DID_ERROR);
		cmd->scsi_done(cmd);
		goto out_unlock;
	default:
		dev_WARN_ONCE(hba->dev, 1, "%s: invalid state %d\n",
				__func__, hba->ufshcd_state);
		set_host_byte(cmd, DID_BAD_TARGET);
		cmd->scsi_done(cmd);
		goto out_unlock;
1318
	}
1319
	spin_unlock_irqrestore(hba->host->host_lock, flags);
1320

1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
	/* acquire the tag to make sure device cmds don't use it */
	if (test_and_set_bit_lock(tag, &hba->lrb_in_use)) {
		/*
		 * Dev manage command in progress, requeue the command.
		 * Requeuing the command helps in cases where the request *may*
		 * find different tag instead of waiting for dev manage command
		 * completion.
		 */
		err = SCSI_MLQUEUE_HOST_BUSY;
		goto out;
	}

1333
1334
1335
1336
1337
1338
1339
1340
	err = ufshcd_hold(hba, true);
	if (err) {
		err = SCSI_MLQUEUE_HOST_BUSY;
		clear_bit_unlock(tag, &hba->lrb_in_use);
		goto out;
	}
	WARN_ON(hba->clk_gating.state != CLKS_ON);

1341
1342
	lrbp = &hba->lrb[tag];

1343
	WARN_ON(lrbp->cmd);
1344
1345
1346
1347
	lrbp->cmd = cmd;
	lrbp->sense_bufflen = SCSI_SENSE_BUFFERSIZE;
	lrbp->sense_buffer = cmd->sense_buffer;
	lrbp->task_tag = tag;
1348
	lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
1349
	lrbp->intr_cmd = !ufshcd_is_intr_aggr_allowed(hba) ? true : false;
1350
1351
1352
	lrbp->command_type = UTP_CMD_TYPE_SCSI;

	/* form UPIU before issuing the command */
1353
	ufshcd_compose_upiu(hba, lrbp);
1354
	err = ufshcd_map_sg(lrbp);
1355
1356
1357
	if (err) {
		lrbp->cmd = NULL;
		clear_bit_unlock(tag, &hba->lrb_in_use);
1358
		goto out;
1359
	}
1360
1361
1362
1363

	/* issue command to the controller */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_send_command(hba, tag);
1364
out_unlock:
1365
1366
1367
1368
1369
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return err;
}

1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
{
	lrbp->cmd = NULL;
	lrbp->sense_bufflen = 0;
	lrbp->sense_buffer = NULL;
	lrbp->task_tag = tag;
	lrbp->lun = 0; /* device management cmd is not specific to any LUN */
	lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
	lrbp->intr_cmd = true; /* No interrupt aggregation */
	hba->dev_cmd.type = cmd_type;

	return ufshcd_compose_upiu(hba, lrbp);
}

static int
ufshcd_clear_cmd(struct ufs_hba *hba, int tag)
{
	int err = 0;
	unsigned long flags;
	u32 mask = 1 << tag;

	/* clear outstanding transaction before retry */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_utrl_clear(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/*
	 * wait for for h/w to clear corresponding bit in door-bell.
	 * max. wait is 1 sec.
	 */
	err = ufshcd_wait_for_register(hba,
			REG_UTP_TRANSFER_REQ_DOOR_BELL,
			mask, ~mask, 1000, 1000);

	return err;
}

1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
static int
ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	/* Get the UPIU response */
	query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
				UPIU_RSP_CODE_OFFSET;
	return query_res->response;
}

1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
/**
 * ufshcd_dev_cmd_completion() - handles device management command responses
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int
ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int resp;
	int err = 0;

	resp = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);

	switch (resp) {
	case UPIU_TRANSACTION_NOP_IN:
		if (hba->dev_cmd.type != DEV_CMD_TYPE_NOP) {
			err = -EINVAL;
			dev_err(hba->dev, "%s: unexpected response %x\n",
					__func__, resp);
		}
		break;
1440
	case UPIU_TRANSACTION_QUERY_RSP:
1441
1442
1443
		err = ufshcd_check_query_response(hba, lrbp);
		if (!err)
			err = ufshcd_copy_query_response(hba, lrbp);
1444
		break;
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
	case UPIU_TRANSACTION_REJECT_UPIU:
		/* TODO: handle Reject UPIU Response */
		err = -EPERM;
		dev_err(hba->dev, "%s: Reject UPIU not fully implemented\n",
				__func__);
		break;
	default:
		err = -EINVAL;
		dev_err(hba->dev, "%s: Invalid device management cmd response: %x\n",
				__func__, resp);
		break;
	}

	return err;
}

static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, int max_timeout)
{
	int err = 0;
	unsigned long time_left;
	unsigned long flags;

	time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
			msecs_to_jiffies(max_timeout));

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->dev_cmd.complete = NULL;
	if (likely(time_left)) {
		err = ufshcd_get_tr_ocs(lrbp);
		if (!err)
			err = ufshcd_dev_cmd_completion(hba, lrbp);
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (!time_left) {
		err = -ETIMEDOUT;
		if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
			/* sucessfully cleared the command, retry if needed */
			err = -EAGAIN;
	}

	return err;
}

/**
 * ufshcd_get_dev_cmd_tag - Get device management command tag
 * @hba: per-adapter instance
 * @tag: pointer to variable with available slot value
 *
 * Get a free slot and lock it until device management command
 * completes.
 *
 * Returns false if free slot is unavailable for locking, else
 * return true with tag value in @tag.
 */
static bool ufshcd_get_dev_cmd_tag(struct ufs_hba *hba, int *tag_out)
{
	int tag;
	bool ret = false;
	unsigned long tmp;

	if (!tag_out)
		goto out;

	do {
		tmp = ~hba->lrb_in_use;
		tag = find_last_bit(&tmp, hba->nutrs);
		if (tag >= hba->nutrs)
			goto out;
	} while (test_and_set_bit_lock(tag, &hba->lrb_in_use));

	*tag_out = tag;
	ret = true;
out:
	return ret;
}

static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag)
{
	clear_bit_unlock(tag, &hba->lrb_in_use);
}

/**
 * ufshcd_exec_dev_cmd - API for sending device management requests
 * @hba - UFS hba
 * @cmd_type - specifies the type (NOP, Query...)
 * @timeout - time in seconds
 *
1534
1535
 * NOTE: Since there is only one available tag for device management commands,
 * it is expected you hold the hba->dev_cmd.lock mutex.
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
 */
static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
		enum dev_cmd_type cmd_type, int timeout)
{
	struct ufshcd_lrb *lrbp;
	int err;
	int tag;
	struct completion wait;
	unsigned long flags;

	/*
	 * Get free slot, sleep if slots are unavailable.
	 * Even though we use wait_event() which sleeps indefinitely,
	 * the maximum wait time is bounded by SCSI request timeout.
	 */
	wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag));

	init_completion(&wait);
	lrbp = &hba->lrb[tag];
	WARN_ON(lrbp->cmd);
	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
	if (unlikely(err))
		goto out_put_tag;

	hba->dev_cmd.complete = &wait;

	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_send_command(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);

out_put_tag:
	ufshcd_put_dev_cmd_tag(hba, tag);
	wake_up(&hba->dev_cmd.tag_wq);
	return err;
}

Dolev Raviv's avatar
Dolev Raviv committed
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
/**
 * ufshcd_init_query() - init the query response and request parameters
 * @hba: per-adapter instance
 * @request: address of the request pointer to be initialized
 * @response: address of the response pointer to be initialized
 * @opcode: operation to perform
 * @idn: flag idn to access
 * @index: LU number to access
 * @selector: query/flag/descriptor further identification
 */
static inline void ufshcd_init_query(struct ufs_hba *hba,
		struct ufs_query_req **request, struct ufs_query_res **response,
		enum query_opcode opcode, u8 idn, u8 index, u8 selector)
{
	*request = &hba->dev_cmd.query.request;
	*response = &hba->dev_cmd.query.response;
	memset(*request, 0, sizeof(struct ufs_query_req));
	memset(*response, 0, sizeof(struct ufs_query_res));
	(*request)->upiu_req.opcode = opcode;
	(*request)->upiu_req.idn = idn;
	(*request)->upiu_req.index = index;
	(*request)->upiu_req.selector = selector;
}

1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
/**
 * ufshcd_query_flag() - API function for sending flag query requests
 * hba: per-adapter instance
 * query_opcode: flag query to perform
 * idn: flag idn to access
 * flag_res: the flag value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
			enum flag_idn idn, bool *flag_res)
{
Dolev Raviv's avatar
Dolev Raviv committed
1610
1611
1612
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err, index = 0, selector = 0;
1613
1614
1615

	BUG_ON(!hba);

1616
	ufshcd_hold(hba, false);
1617
	mutex_lock(&hba->dev_cmd.lock);
Dolev Raviv's avatar
Dolev Raviv committed
1618
1619
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644

	switch (opcode) {
	case UPIU_QUERY_OPCODE_SET_FLAG:
	case UPIU_QUERY_OPCODE_CLEAR_FLAG:
	case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		break;
	case UPIU_QUERY_OPCODE_READ_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		if (!flag_res) {
			/* No dummy reads */
			dev_err(hba->dev, "%s: Invalid argument for read request\n",
					__func__);
			err = -EINVAL;
			goto out_unlock;
		}
		break;
	default:
		dev_err(hba->dev,
			"%s: Expected query flag opcode but got = %d\n",
			__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

Dolev Raviv's avatar
Dolev Raviv committed
1645
	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
1646
1647
1648
1649
1650
1651
1652
1653
1654

	if (err) {
		dev_err(hba->dev,
			"%s: Sending flag query for idn %d failed, err = %d\n",
			__func__, idn, err);
		goto out_unlock;
	}

	if (flag_res)
1655
		*flag_res = (be32_to_cpu(response->upiu_res.value) &
1656
1657
1658
1659
				MASK_QUERY_UPIU_FLAG_LOC) & 0x1;

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
1660
	ufshcd_release(hba);
1661
1662
1663
	return err;
}

1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
/**
 * ufshcd_query_attr - API function for sending attribute requests
 * hba: per-adapter instance
 * opcode: attribute opcode
 * idn: attribute idn to access
 * index: index field
 * selector: selector field
 * attr_val: the attribute value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
*/
1675
static int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
1676
1677
			enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
{
Dolev Raviv's avatar
Dolev Raviv committed
1678
1679
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
1680
1681
1682
1683
	int err;

	BUG_ON(!hba);

1684
	ufshcd_hold(hba, false);
1685
1686
1687
1688
1689
1690
1691
1692
	if (!attr_val) {
		dev_err(hba->dev, "%s: attribute value required for opcode 0x%x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out;
	}

	mutex_lock(&hba->dev_cmd.lock);
Dolev Raviv's avatar
Dolev Raviv committed
1693
1694
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);
1695
1696
1697
1698

	switch (opcode) {
	case UPIU_QUERY_OPCODE_WRITE_ATTR:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
1699
		request->upiu_req.value = cpu_to_be32(*attr_val);
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
		break;
	case UPIU_QUERY_OPCODE_READ_ATTR:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		break;
	default:
		dev_err(hba->dev, "%s: Expected query attr opcode but got = 0x%.2x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

Dolev Raviv's avatar
Dolev Raviv committed
1711
	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
1712
1713
1714
1715
1716
1717
1718

	if (err) {
		dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
				__func__, opcode, idn, err);
		goto out_unlock;
	}

1719
	*attr_val = be32_to_cpu(response->upiu_res.value);
1720
1721
1722
1723

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
out:
1724
	ufshcd_release(hba);
1725
1726
1727
	return err;
}

Dolev Raviv's avatar
Dolev Raviv committed
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
/**
 * ufshcd_query_descriptor - API function for sending descriptor requests
 * hba: per-adapter instance
 * opcode: attribute opcode
 * idn: attribute idn to access
 * index: index field
 * selector: selector field
 * desc_buf: the buffer that contains the descriptor
 * buf_len: length parameter passed to the device
 *
 * Returns 0 for success, non-zero in case of failure.
 * The buf_len parameter will contain, on return, the length parameter
 * received on the response.
 */
1742
static int ufshcd_query_descriptor(struct ufs_hba *hba,
Dolev Raviv's avatar
Dolev Raviv committed
1743
1744
1745
1746
1747
1748
1749
1750
1751
			enum query_opcode opcode, enum desc_idn idn, u8 index,
			u8 selector, u8 *desc_buf, int *buf_len)
{
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err;

	BUG_ON(!hba);

1752
	ufshcd_hold(hba, false);
Dolev Raviv's avatar
Dolev Raviv committed
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
	if (!desc_buf) {
		dev_err(hba->dev, "%s: descriptor buffer required for opcode 0x%x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out;
	}

	if (*buf_len <= QUERY_DESC_MIN_SIZE || *buf_len > QUERY_DESC_MAX_SIZE) {
		dev_err(hba->dev, "%s: descriptor buffer size (%d) is out of range\n",
				__func__, *buf_len);
		err = -EINVAL;
		goto out;
	}

	mutex_lock(&hba->dev_cmd.lock);
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);
	hba->dev_cmd.query.descriptor = desc_buf;
1771
	request->upiu_req.length = cpu_to_be16(*buf_len);
Dolev Raviv's avatar
Dolev Raviv committed
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796

	switch (opcode) {
	case UPIU_QUERY_OPCODE_WRITE_DESC:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		break;
	case UPIU_QUERY_OPCODE_READ_DESC:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		break