summaryrefslogtreecommitdiff
path: root/drivers/scsi/smartpqi/smartpqi_sis.c
blob: 59d9c2792371813cedab5c1bbfd742cef2109f66 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
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
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
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
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
// SPDX-License-Identifier: GPL-2.0
/*
 *    driver for Microchip PQI-based storage controllers
 *    Copyright (c) 2019-2021 Microchip Technology Inc. and its subsidiaries
 *    Copyright (c) 2016-2018 Microsemi Corporation
 *    Copyright (c) 2016 PMC-Sierra, Inc.
 *
 *    Questions/Comments/Bugfixes to storagedev@microchip.com
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <scsi/scsi_device.h>
#include <asm/unaligned.h>
#include "smartpqi.h"
#include "smartpqi_sis.h"

/* legacy SIS interface commands */
#define SIS_CMD_GET_ADAPTER_PROPERTIES		0x19
#define SIS_CMD_INIT_BASE_STRUCT_ADDRESS	0x1b
#define SIS_CMD_GET_PQI_CAPABILITIES		0x3000

/* for submission of legacy SIS commands */
#define SIS_REENABLE_SIS_MODE			0x1
#define SIS_ENABLE_MSIX				0x40
#define SIS_ENABLE_INTX				0x80
#define SIS_SOFT_RESET				0x100
#define SIS_CMD_READY				0x200
#define SIS_TRIGGER_SHUTDOWN			0x800000
#define SIS_PQI_RESET_QUIESCE			0x1000000

#define SIS_CMD_COMPLETE			0x1000
#define SIS_CLEAR_CTRL_TO_HOST_DOORBELL		0x1000

#define SIS_CMD_STATUS_SUCCESS			0x1
#define SIS_CMD_COMPLETE_TIMEOUT_SECS		30
#define SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS	10

/* used with SIS_CMD_GET_ADAPTER_PROPERTIES command */
#define SIS_EXTENDED_PROPERTIES_SUPPORTED	0x800000
#define SIS_SMARTARRAY_FEATURES_SUPPORTED	0x2
#define SIS_PQI_MODE_SUPPORTED			0x4
#define SIS_PQI_RESET_QUIESCE_SUPPORTED		0x8
#define SIS_REQUIRED_EXTENDED_PROPERTIES	\
	(SIS_SMARTARRAY_FEATURES_SUPPORTED | SIS_PQI_MODE_SUPPORTED)

/* used with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
#define SIS_BASE_STRUCT_REVISION		9
#define SIS_BASE_STRUCT_ALIGNMENT		16

#define SIS_CTRL_KERNEL_FW_TRIAGE		0x3
#define SIS_CTRL_KERNEL_UP			0x80
#define SIS_CTRL_KERNEL_PANIC			0x100
#define SIS_CTRL_READY_TIMEOUT_SECS		180
#define SIS_CTRL_READY_RESUME_TIMEOUT_SECS	90
#define SIS_CTRL_READY_POLL_INTERVAL_MSECS	10

enum sis_fw_triage_status {
	FW_TRIAGE_NOT_STARTED = 0,
	FW_TRIAGE_STARTED,
	FW_TRIAGE_COND_INVALID,
	FW_TRIAGE_COMPLETED
};

#pragma pack(1)

/* for use with SIS_CMD_INIT_BASE_STRUCT_ADDRESS command */
struct sis_base_struct {
	__le32	revision;		/* revision of this structure */
	__le32	flags;			/* reserved */
	__le32	error_buffer_paddr_low;	/* lower 32 bits of physical memory */
					/* buffer for PQI error response */
					/* data */
	__le32	error_buffer_paddr_high;	/* upper 32 bits of physical */
						/* memory buffer for PQI */
						/* error response data */
	__le32	error_buffer_element_length;	/* length of each PQI error */
						/* response buffer element */
						/* in bytes */
	__le32	error_buffer_num_elements;	/* total number of PQI error */
						/* response buffers available */
};

#pragma pack()

static int sis_wait_for_ctrl_ready_with_timeout(struct pqi_ctrl_info *ctrl_info,
	unsigned int timeout_secs)
{
	unsigned long timeout;
	u32 status;

	timeout = (timeout_secs * HZ) + jiffies;

	while (1) {
		status = readl(&ctrl_info->registers->sis_firmware_status);
		if (status != ~0) {
			if (status & SIS_CTRL_KERNEL_PANIC) {
				dev_err(&ctrl_info->pci_dev->dev,
					"controller is offline: status code 0x%x\n",
					readl(
					&ctrl_info->registers->sis_mailbox[7]));
				return -ENODEV;
			}
			if (status & SIS_CTRL_KERNEL_UP)
				break;
		}
		if (time_after(jiffies, timeout)) {
			dev_err(&ctrl_info->pci_dev->dev,
				"controller not ready after %u seconds\n",
				timeout_secs);
			return -ETIMEDOUT;
		}
		msleep(SIS_CTRL_READY_POLL_INTERVAL_MSECS);
	}

	return 0;
}

int sis_wait_for_ctrl_ready(struct pqi_ctrl_info *ctrl_info)
{
	return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
		SIS_CTRL_READY_TIMEOUT_SECS);
}

int sis_wait_for_ctrl_ready_resume(struct pqi_ctrl_info *ctrl_info)
{
	return sis_wait_for_ctrl_ready_with_timeout(ctrl_info,
		SIS_CTRL_READY_RESUME_TIMEOUT_SECS);
}

bool sis_is_firmware_running(struct pqi_ctrl_info *ctrl_info)
{
	bool running;
	u32 status;

	status = readl(&ctrl_info->registers->sis_firmware_status);

	if (status != ~0 && (status & SIS_CTRL_KERNEL_PANIC))
		running = false;
	else
		running = true;

	if (!running)
		dev_err(&ctrl_info->pci_dev->dev,
			"controller is offline: status code 0x%x\n",
			readl(&ctrl_info->registers->sis_mailbox[7]));

	return running;
}

bool sis_is_kernel_up(struct pqi_ctrl_info *ctrl_info)
{
	return readl(&ctrl_info->registers->sis_firmware_status) &
		SIS_CTRL_KERNEL_UP;
}

u32 sis_get_product_id(struct pqi_ctrl_info *ctrl_info)
{
	return readl(&ctrl_info->registers->sis_product_identifier);
}

/* used for passing command parameters/results when issuing SIS commands */
struct sis_sync_cmd_params {
	u32	mailbox[6];	/* mailboxes 0-5 */
};

static int sis_send_sync_cmd(struct pqi_ctrl_info *ctrl_info,
	u32 cmd, struct sis_sync_cmd_params *params)
{
	struct pqi_ctrl_registers __iomem *registers;
	unsigned int i;
	unsigned long timeout;
	u32 doorbell;
	u32 cmd_status;

	registers = ctrl_info->registers;

	/* Write the command to mailbox 0. */
	writel(cmd, &registers->sis_mailbox[0]);

	/*
	 * Write the command parameters to mailboxes 1-4 (mailbox 5 is not used
	 * when sending a command to the controller).
	 */
	for (i = 1; i <= 4; i++)
		writel(params->mailbox[i], &registers->sis_mailbox[i]);

	/* Clear the command doorbell. */
	writel(SIS_CLEAR_CTRL_TO_HOST_DOORBELL,
		&registers->sis_ctrl_to_host_doorbell_clear);

	/* Disable doorbell interrupts by masking all interrupts. */
	writel(~0, &registers->sis_interrupt_mask);
	usleep_range(1000, 2000);

	/*
	 * Force the completion of the interrupt mask register write before
	 * submitting the command.
	 */
	readl(&registers->sis_interrupt_mask);

	/* Submit the command to the controller. */
	writel(SIS_CMD_READY, &registers->sis_host_to_ctrl_doorbell);

	/*
	 * Poll for command completion.  Note that the call to msleep() is at
	 * the top of the loop in order to give the controller time to start
	 * processing the command before we start polling.
	 */
	timeout = (SIS_CMD_COMPLETE_TIMEOUT_SECS * HZ) + jiffies;
	while (1) {
		msleep(SIS_CMD_COMPLETE_POLL_INTERVAL_MSECS);
		doorbell = readl(&registers->sis_ctrl_to_host_doorbell);
		if (doorbell & SIS_CMD_COMPLETE)
			break;
		if (time_after(jiffies, timeout))
			return -ETIMEDOUT;
	}

	/* Read the command status from mailbox 0. */
	cmd_status = readl(&registers->sis_mailbox[0]);
	if (cmd_status != SIS_CMD_STATUS_SUCCESS) {
		dev_err(&ctrl_info->pci_dev->dev,
			"SIS command failed for command 0x%x: status = 0x%x\n",
			cmd, cmd_status);
		return -EINVAL;
	}

	/*
	 * The command completed successfully, so save the command status and
	 * read the values returned in mailboxes 1-5.
	 */
	params->mailbox[0] = cmd_status;
	for (i = 1; i < ARRAY_SIZE(params->mailbox); i++)
		params->mailbox[i] = readl(&registers->sis_mailbox[i]);

	return 0;
}

/*
 * This function verifies that we are talking to a controller that speaks PQI.
 */

int sis_get_ctrl_properties(struct pqi_ctrl_info *ctrl_info)
{
	int rc;
	u32 properties;
	u32 extended_properties;
	struct sis_sync_cmd_params params;

	memset(&params, 0, sizeof(params));

	rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_ADAPTER_PROPERTIES,
		&params);
	if (rc)
		return rc;

	properties = params.mailbox[1];

	if (!(properties & SIS_EXTENDED_PROPERTIES_SUPPORTED))
		return -ENODEV;

	extended_properties = params.mailbox[4];

	if ((extended_properties & SIS_REQUIRED_EXTENDED_PROPERTIES) !=
		SIS_REQUIRED_EXTENDED_PROPERTIES)
		return -ENODEV;

	if (extended_properties & SIS_PQI_RESET_QUIESCE_SUPPORTED)
		ctrl_info->pqi_reset_quiesce_supported = true;

	return 0;
}

int sis_get_pqi_capabilities(struct pqi_ctrl_info *ctrl_info)
{
	int rc;
	struct sis_sync_cmd_params params;

	memset(&params, 0, sizeof(params));

	rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_GET_PQI_CAPABILITIES,
		&params);
	if (rc)
		return rc;

	ctrl_info->max_sg_entries = params.mailbox[1];
	ctrl_info->max_transfer_size = params.mailbox[2];
	ctrl_info->max_outstanding_requests = params.mailbox[3];
	ctrl_info->config_table_offset = params.mailbox[4];
	ctrl_info->config_table_length = params.mailbox[5];

	return 0;
}

int sis_init_base_struct_addr(struct pqi_ctrl_info *ctrl_info)
{
	int rc;
	void *base_struct_unaligned;
	struct sis_base_struct *base_struct;
	struct sis_sync_cmd_params params;
	unsigned long error_buffer_paddr;
	dma_addr_t bus_address;

	base_struct_unaligned = kzalloc(sizeof(*base_struct)
		+ SIS_BASE_STRUCT_ALIGNMENT - 1, GFP_KERNEL);
	if (!base_struct_unaligned)
		return -ENOMEM;

	base_struct = PTR_ALIGN(base_struct_unaligned,
		SIS_BASE_STRUCT_ALIGNMENT);
	error_buffer_paddr = (unsigned long)ctrl_info->error_buffer_dma_handle;

	put_unaligned_le32(SIS_BASE_STRUCT_REVISION, &base_struct->revision);
	put_unaligned_le32(lower_32_bits(error_buffer_paddr),
		&base_struct->error_buffer_paddr_low);
	put_unaligned_le32(upper_32_bits(error_buffer_paddr),
		&base_struct->error_buffer_paddr_high);
	put_unaligned_le32(PQI_ERROR_BUFFER_ELEMENT_LENGTH,
		&base_struct->error_buffer_element_length);
	put_unaligned_le32(ctrl_info->max_io_slots,
		&base_struct->error_buffer_num_elements);

	bus_address = dma_map_single(&ctrl_info->pci_dev->dev, base_struct,
		sizeof(*base_struct), DMA_TO_DEVICE);
	if (dma_mapping_error(&ctrl_info->pci_dev->dev, bus_address)) {
		rc = -ENOMEM;
		goto out;
	}

	memset(&params, 0, sizeof(params));
	params.mailbox[1] = lower_32_bits((u64)bus_address);
	params.mailbox[2] = upper_32_bits((u64)bus_address);
	params.mailbox[3] = sizeof(*base_struct);

	rc = sis_send_sync_cmd(ctrl_info, SIS_CMD_INIT_BASE_STRUCT_ADDRESS,
		&params);

	dma_unmap_single(&ctrl_info->pci_dev->dev, bus_address,
			sizeof(*base_struct), DMA_TO_DEVICE);
out:
	kfree(base_struct_unaligned);

	return rc;
}

#define SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS	30

static int sis_wait_for_doorbell_bit_to_clear(
	struct pqi_ctrl_info *ctrl_info, u32 bit)
{
	int rc = 0;
	u32 doorbell_register;
	unsigned long timeout;

	timeout = (SIS_DOORBELL_BIT_CLEAR_TIMEOUT_SECS * HZ) + jiffies;

	while (1) {
		doorbell_register =
			readl(&ctrl_info->registers->sis_host_to_ctrl_doorbell);
		if ((doorbell_register & bit) == 0)
			break;
		if (readl(&ctrl_info->registers->sis_firmware_status) &
			SIS_CTRL_KERNEL_PANIC) {
			rc = -ENODEV;
			break;
		}
		if (time_after(jiffies, timeout)) {
			dev_err(&ctrl_info->pci_dev->dev,
				"doorbell register bit 0x%x not cleared\n",
				bit);
			rc = -ETIMEDOUT;
			break;
		}
		usleep_range(1000, 2000);
	}

	return rc;
}

static inline int sis_set_doorbell_bit(struct pqi_ctrl_info *ctrl_info, u32 bit)
{
	writel(bit, &ctrl_info->registers->sis_host_to_ctrl_doorbell);
	usleep_range(1000, 2000);

	return sis_wait_for_doorbell_bit_to_clear(ctrl_info, bit);
}

void sis_enable_msix(struct pqi_ctrl_info *ctrl_info)
{
	sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_MSIX);
}

void sis_enable_intx(struct pqi_ctrl_info *ctrl_info)
{
	sis_set_doorbell_bit(ctrl_info, SIS_ENABLE_INTX);
}

void sis_shutdown_ctrl(struct pqi_ctrl_info *ctrl_info,
	enum pqi_ctrl_shutdown_reason ctrl_shutdown_reason)
{
	if (readl(&ctrl_info->registers->sis_firmware_status) &
		SIS_CTRL_KERNEL_PANIC)
		return;

	if (ctrl_info->firmware_triage_supported)
		writel(ctrl_shutdown_reason, &ctrl_info->registers->sis_ctrl_shutdown_reason_code);

	writel(SIS_TRIGGER_SHUTDOWN, &ctrl_info->registers->sis_host_to_ctrl_doorbell);
}

int sis_pqi_reset_quiesce(struct pqi_ctrl_info *ctrl_info)
{
	return sis_set_doorbell_bit(ctrl_info, SIS_PQI_RESET_QUIESCE);
}

int sis_reenable_sis_mode(struct pqi_ctrl_info *ctrl_info)
{
	return sis_set_doorbell_bit(ctrl_info, SIS_REENABLE_SIS_MODE);
}

void sis_write_driver_scratch(struct pqi_ctrl_info *ctrl_info, u32 value)
{
	writel(value, &ctrl_info->registers->sis_driver_scratch);
	usleep_range(1000, 2000);
}

u32 sis_read_driver_scratch(struct pqi_ctrl_info *ctrl_info)
{
	return readl(&ctrl_info->registers->sis_driver_scratch);
}

static inline enum sis_fw_triage_status
	sis_read_firmware_triage_status(struct pqi_ctrl_info *ctrl_info)
{
	return ((enum sis_fw_triage_status)(readl(&ctrl_info->registers->sis_firmware_status) &
		SIS_CTRL_KERNEL_FW_TRIAGE));
}

void sis_soft_reset(struct pqi_ctrl_info *ctrl_info)
{
	writel(SIS_SOFT_RESET,
		&ctrl_info->registers->sis_host_to_ctrl_doorbell);
}

#define SIS_FW_TRIAGE_STATUS_TIMEOUT_SECS		300
#define SIS_FW_TRIAGE_STATUS_POLL_INTERVAL_SECS		1

int sis_wait_for_fw_triage_completion(struct pqi_ctrl_info *ctrl_info)
{
	int rc;
	enum sis_fw_triage_status status;
	unsigned long timeout;

	timeout = (SIS_FW_TRIAGE_STATUS_TIMEOUT_SECS * HZ) + jiffies;
	while (1) {
		status = sis_read_firmware_triage_status(ctrl_info);
		if (status == FW_TRIAGE_COND_INVALID) {
			dev_err(&ctrl_info->pci_dev->dev,
				"firmware triage condition invalid\n");
			rc = -EINVAL;
			break;
		} else if (status == FW_TRIAGE_NOT_STARTED ||
			status == FW_TRIAGE_COMPLETED) {
			rc = 0;
			break;
		}

		if (time_after(jiffies, timeout)) {
			dev_err(&ctrl_info->pci_dev->dev,
				"timed out waiting for firmware triage status\n");
			rc = -ETIMEDOUT;
			break;
		}

		ssleep(SIS_FW_TRIAGE_STATUS_POLL_INTERVAL_SECS);
	}

	return rc;
}

void sis_verify_structures(void)
{
	BUILD_BUG_ON(offsetof(struct sis_base_struct,
		revision) != 0x0);
	BUILD_BUG_ON(offsetof(struct sis_base_struct,
		flags) != 0x4);
	BUILD_BUG_ON(offsetof(struct sis_base_struct,
		error_buffer_paddr_low) != 0x8);
	BUILD_BUG_ON(offsetof(struct sis_base_struct,
		error_buffer_paddr_high) != 0xc);
	BUILD_BUG_ON(offsetof(struct sis_base_struct,
		error_buffer_element_length) != 0x10);
	BUILD_BUG_ON(offsetof(struct sis_base_struct,
		error_buffer_num_elements) != 0x14);
	BUILD_BUG_ON(sizeof(struct sis_base_struct) != 0x18);
}