xref: /openbmc/linux/drivers/scsi/pm8001/pm8001_ctl.c (revision d0b73b48)
1 /*
2  * PMC-Sierra SPC 8001 SAS/SATA based host adapters driver
3  *
4  * Copyright (c) 2008-2009 USI Co., Ltd.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions, and the following disclaimer,
12  *    without modification.
13  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
14  *    substantially similar to the "NO WARRANTY" disclaimer below
15  *    ("Disclaimer") and any redistribution must be conditioned upon
16  *    including a substantially similar Disclaimer requirement for further
17  *    binary redistribution.
18  * 3. Neither the names of the above-listed copyright holders nor the names
19  *    of any contributors may be used to endorse or promote products derived
20  *    from this software without specific prior written permission.
21  *
22  * Alternatively, this software may be distributed under the terms of the
23  * GNU General Public License ("GPL") version 2 as published by the Free
24  * Software Foundation.
25  *
26  * NO WARRANTY
27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
35  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
36  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37  * POSSIBILITY OF SUCH DAMAGES.
38  *
39  */
40 #include <linux/firmware.h>
41 #include <linux/slab.h>
42 #include "pm8001_sas.h"
43 #include "pm8001_ctl.h"
44 
45 /* scsi host attributes */
46 
47 /**
48  * pm8001_ctl_mpi_interface_rev_show - MPI interface revision number
49  * @cdev: pointer to embedded class device
50  * @buf: the buffer returned
51  *
52  * A sysfs 'read-only' shost attribute.
53  */
54 static ssize_t pm8001_ctl_mpi_interface_rev_show(struct device *cdev,
55 	struct device_attribute *attr, char *buf)
56 {
57 	struct Scsi_Host *shost = class_to_shost(cdev);
58 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
59 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
60 
61 	return snprintf(buf, PAGE_SIZE, "%d\n",
62 		pm8001_ha->main_cfg_tbl.interface_rev);
63 }
64 static
65 DEVICE_ATTR(interface_rev, S_IRUGO, pm8001_ctl_mpi_interface_rev_show, NULL);
66 
67 /**
68  * pm8001_ctl_fw_version_show - firmware version
69  * @cdev: pointer to embedded class device
70  * @buf: the buffer returned
71  *
72  * A sysfs 'read-only' shost attribute.
73  */
74 static ssize_t pm8001_ctl_fw_version_show(struct device *cdev,
75 	struct device_attribute *attr, char *buf)
76 {
77 	struct Scsi_Host *shost = class_to_shost(cdev);
78 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
79 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
80 
81 	return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x.%02x\n",
82 		       (u8)(pm8001_ha->main_cfg_tbl.firmware_rev >> 24),
83 		       (u8)(pm8001_ha->main_cfg_tbl.firmware_rev >> 16),
84 		       (u8)(pm8001_ha->main_cfg_tbl.firmware_rev >> 8),
85 		       (u8)(pm8001_ha->main_cfg_tbl.firmware_rev));
86 }
87 static DEVICE_ATTR(fw_version, S_IRUGO, pm8001_ctl_fw_version_show, NULL);
88 /**
89  * pm8001_ctl_max_out_io_show - max outstanding io supported
90  * @cdev: pointer to embedded class device
91  * @buf: the buffer returned
92  *
93  * A sysfs 'read-only' shost attribute.
94  */
95 static ssize_t pm8001_ctl_max_out_io_show(struct device *cdev,
96 	struct device_attribute *attr, char *buf)
97 {
98 	struct Scsi_Host *shost = class_to_shost(cdev);
99 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
100 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
101 
102 	return snprintf(buf, PAGE_SIZE, "%d\n",
103 			pm8001_ha->main_cfg_tbl.max_out_io);
104 }
105 static DEVICE_ATTR(max_out_io, S_IRUGO, pm8001_ctl_max_out_io_show, NULL);
106 /**
107  * pm8001_ctl_max_devices_show - max devices support
108  * @cdev: pointer to embedded class device
109  * @buf: the buffer returned
110  *
111  * A sysfs 'read-only' shost attribute.
112  */
113 static ssize_t pm8001_ctl_max_devices_show(struct device *cdev,
114 	struct device_attribute *attr, char *buf)
115 {
116 	struct Scsi_Host *shost = class_to_shost(cdev);
117 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
118 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
119 
120 	return snprintf(buf, PAGE_SIZE, "%04d\n",
121 			(u16)(pm8001_ha->main_cfg_tbl.max_sgl >> 16));
122 }
123 static DEVICE_ATTR(max_devices, S_IRUGO, pm8001_ctl_max_devices_show, NULL);
124 /**
125  * pm8001_ctl_max_sg_list_show - max sg list supported iff not 0.0 for no
126  * hardware limitation
127  * @cdev: pointer to embedded class device
128  * @buf: the buffer returned
129  *
130  * A sysfs 'read-only' shost attribute.
131  */
132 static ssize_t pm8001_ctl_max_sg_list_show(struct device *cdev,
133 	struct device_attribute *attr, char *buf)
134 {
135 	struct Scsi_Host *shost = class_to_shost(cdev);
136 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
137 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
138 
139 	return snprintf(buf, PAGE_SIZE, "%04d\n",
140 			pm8001_ha->main_cfg_tbl.max_sgl & 0x0000FFFF);
141 }
142 static DEVICE_ATTR(max_sg_list, S_IRUGO, pm8001_ctl_max_sg_list_show, NULL);
143 
144 #define SAS_1_0 0x1
145 #define SAS_1_1 0x2
146 #define SAS_2_0 0x4
147 
148 static ssize_t
149 show_sas_spec_support_status(unsigned int mode, char *buf)
150 {
151 	ssize_t len = 0;
152 
153 	if (mode & SAS_1_1)
154 		len = sprintf(buf, "%s", "SAS1.1");
155 	if (mode & SAS_2_0)
156 		len += sprintf(buf + len, "%s%s", len ? ", " : "", "SAS2.0");
157 	len += sprintf(buf + len, "\n");
158 
159 	return len;
160 }
161 
162 /**
163  * pm8001_ctl_sas_spec_support_show - sas spec supported
164  * @cdev: pointer to embedded class device
165  * @buf: the buffer returned
166  *
167  * A sysfs 'read-only' shost attribute.
168  */
169 static ssize_t pm8001_ctl_sas_spec_support_show(struct device *cdev,
170 	struct device_attribute *attr, char *buf)
171 {
172 	unsigned int mode;
173 	struct Scsi_Host *shost = class_to_shost(cdev);
174 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
175 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
176 	mode = (pm8001_ha->main_cfg_tbl.ctrl_cap_flag & 0xfe000000)>>25;
177 	return show_sas_spec_support_status(mode, buf);
178 }
179 static DEVICE_ATTR(sas_spec_support, S_IRUGO,
180 		   pm8001_ctl_sas_spec_support_show, NULL);
181 
182 /**
183  * pm8001_ctl_sas_address_show - sas address
184  * @cdev: pointer to embedded class device
185  * @buf: the buffer returned
186  *
187  * This is the controller sas address
188  *
189  * A sysfs 'read-only' shost attribute.
190  */
191 static ssize_t pm8001_ctl_host_sas_address_show(struct device *cdev,
192 	struct device_attribute *attr, char *buf)
193 {
194 	struct Scsi_Host *shost = class_to_shost(cdev);
195 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
196 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
197 	return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
198 			be64_to_cpu(*(__be64 *)pm8001_ha->sas_addr));
199 }
200 static DEVICE_ATTR(host_sas_address, S_IRUGO,
201 		   pm8001_ctl_host_sas_address_show, NULL);
202 
203 /**
204  * pm8001_ctl_logging_level_show - logging level
205  * @cdev: pointer to embedded class device
206  * @buf: the buffer returned
207  *
208  * A sysfs 'read/write' shost attribute.
209  */
210 static ssize_t pm8001_ctl_logging_level_show(struct device *cdev,
211 	struct device_attribute *attr, char *buf)
212 {
213 	struct Scsi_Host *shost = class_to_shost(cdev);
214 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
215 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
216 
217 	return snprintf(buf, PAGE_SIZE, "%08xh\n", pm8001_ha->logging_level);
218 }
219 static ssize_t pm8001_ctl_logging_level_store(struct device *cdev,
220 	struct device_attribute *attr, const char *buf, size_t count)
221 {
222 	struct Scsi_Host *shost = class_to_shost(cdev);
223 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
224 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
225 	int val = 0;
226 
227 	if (sscanf(buf, "%x", &val) != 1)
228 		return -EINVAL;
229 
230 	pm8001_ha->logging_level = val;
231 	return strlen(buf);
232 }
233 
234 static DEVICE_ATTR(logging_level, S_IRUGO | S_IWUSR,
235 	pm8001_ctl_logging_level_show, pm8001_ctl_logging_level_store);
236 /**
237  * pm8001_ctl_aap_log_show - aap1 event log
238  * @cdev: pointer to embedded class device
239  * @buf: the buffer returned
240  *
241  * A sysfs 'read-only' shost attribute.
242  */
243 static ssize_t pm8001_ctl_aap_log_show(struct device *cdev,
244 	struct device_attribute *attr, char *buf)
245 {
246 	struct Scsi_Host *shost = class_to_shost(cdev);
247 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
248 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
249 	int i;
250 #define AAP1_MEMMAP(r, c) \
251 	(*(u32 *)((u8*)pm8001_ha->memoryMap.region[AAP1].virt_ptr + (r) * 32 \
252 	+ (c)))
253 
254 	char *str = buf;
255 	int max = 2;
256 	for (i = 0; i < max; i++) {
257 		str += sprintf(str, "0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x"
258 			       "0x%08x 0x%08x\n",
259 			       AAP1_MEMMAP(i, 0),
260 			       AAP1_MEMMAP(i, 4),
261 			       AAP1_MEMMAP(i, 8),
262 			       AAP1_MEMMAP(i, 12),
263 			       AAP1_MEMMAP(i, 16),
264 			       AAP1_MEMMAP(i, 20),
265 			       AAP1_MEMMAP(i, 24),
266 			       AAP1_MEMMAP(i, 28));
267 	}
268 
269 	return str - buf;
270 }
271 static DEVICE_ATTR(aap_log, S_IRUGO, pm8001_ctl_aap_log_show, NULL);
272 /**
273  * pm8001_ctl_aap_log_show - IOP event log
274  * @cdev: pointer to embedded class device
275  * @buf: the buffer returned
276  *
277  * A sysfs 'read-only' shost attribute.
278  */
279 static ssize_t pm8001_ctl_iop_log_show(struct device *cdev,
280 	struct device_attribute *attr, char *buf)
281 {
282 	struct Scsi_Host *shost = class_to_shost(cdev);
283 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
284 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
285 #define IOP_MEMMAP(r, c) \
286 	(*(u32 *)((u8*)pm8001_ha->memoryMap.region[IOP].virt_ptr + (r) * 32 \
287 	+ (c)))
288 	int i;
289 	char *str = buf;
290 	int max = 2;
291 	for (i = 0; i < max; i++) {
292 		str += sprintf(str, "0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x"
293 			       "0x%08x 0x%08x\n",
294 			       IOP_MEMMAP(i, 0),
295 			       IOP_MEMMAP(i, 4),
296 			       IOP_MEMMAP(i, 8),
297 			       IOP_MEMMAP(i, 12),
298 			       IOP_MEMMAP(i, 16),
299 			       IOP_MEMMAP(i, 20),
300 			       IOP_MEMMAP(i, 24),
301 			       IOP_MEMMAP(i, 28));
302 	}
303 
304 	return str - buf;
305 }
306 static DEVICE_ATTR(iop_log, S_IRUGO, pm8001_ctl_iop_log_show, NULL);
307 
308 #define FLASH_CMD_NONE      0x00
309 #define FLASH_CMD_UPDATE    0x01
310 #define FLASH_CMD_SET_NVMD    0x02
311 
312 struct flash_command {
313      u8      command[8];
314      int     code;
315 };
316 
317 static struct flash_command flash_command_table[] =
318 {
319      {"set_nvmd",    FLASH_CMD_SET_NVMD},
320      {"update",      FLASH_CMD_UPDATE},
321      {"",            FLASH_CMD_NONE} /* Last entry should be NULL. */
322 };
323 
324 struct error_fw {
325      char    *reason;
326      int     err_code;
327 };
328 
329 static struct error_fw flash_error_table[] =
330 {
331      {"Failed to open fw image file",	FAIL_OPEN_BIOS_FILE},
332      {"image header mismatch",		FLASH_UPDATE_HDR_ERR},
333      {"image offset mismatch",		FLASH_UPDATE_OFFSET_ERR},
334      {"image CRC Error",		FLASH_UPDATE_CRC_ERR},
335      {"image length Error.",		FLASH_UPDATE_LENGTH_ERR},
336      {"Failed to program flash chip",	FLASH_UPDATE_HW_ERR},
337      {"Flash chip not supported.",	FLASH_UPDATE_DNLD_NOT_SUPPORTED},
338      {"Flash update disabled.",		FLASH_UPDATE_DISABLED},
339      {"Flash in progress",		FLASH_IN_PROGRESS},
340      {"Image file size Error",		FAIL_FILE_SIZE},
341      {"Input parameter error",		FAIL_PARAMETERS},
342      {"Out of memory",			FAIL_OUT_MEMORY},
343      {"OK", 0}	/* Last entry err_code = 0. */
344 };
345 
346 static int pm8001_set_nvmd(struct pm8001_hba_info *pm8001_ha)
347 {
348 	struct pm8001_ioctl_payload	*payload;
349 	DECLARE_COMPLETION_ONSTACK(completion);
350 	u8		*ioctlbuffer = NULL;
351 	u32		length = 0;
352 	u32		ret = 0;
353 
354 	length = 1024 * 5 + sizeof(*payload) - 1;
355 	ioctlbuffer = kzalloc(length, GFP_KERNEL);
356 	if (!ioctlbuffer)
357 		return -ENOMEM;
358 	if ((pm8001_ha->fw_image->size <= 0) ||
359 	    (pm8001_ha->fw_image->size > 4096)) {
360 		ret = FAIL_FILE_SIZE;
361 		goto out;
362 	}
363 	payload = (struct pm8001_ioctl_payload *)ioctlbuffer;
364 	memcpy((u8 *)payload->func_specific, (u8 *)pm8001_ha->fw_image->data,
365 				pm8001_ha->fw_image->size);
366 	payload->length = pm8001_ha->fw_image->size;
367 	payload->id = 0;
368 	pm8001_ha->nvmd_completion = &completion;
369 	ret = PM8001_CHIP_DISP->set_nvmd_req(pm8001_ha, payload);
370 	wait_for_completion(&completion);
371 out:
372 	kfree(ioctlbuffer);
373 	return ret;
374 }
375 
376 static int pm8001_update_flash(struct pm8001_hba_info *pm8001_ha)
377 {
378 	struct pm8001_ioctl_payload	*payload;
379 	DECLARE_COMPLETION_ONSTACK(completion);
380 	u8		*ioctlbuffer = NULL;
381 	u32		length = 0;
382 	struct fw_control_info	*fwControl;
383 	u32		loopNumber, loopcount = 0;
384 	u32		sizeRead = 0;
385 	u32		partitionSize, partitionSizeTmp;
386 	u32		ret = 0;
387 	u32		partitionNumber = 0;
388 	struct pm8001_fw_image_header *image_hdr;
389 
390 	length = 1024 * 16 + sizeof(*payload) - 1;
391 	ioctlbuffer = kzalloc(length, GFP_KERNEL);
392 	image_hdr = (struct pm8001_fw_image_header *)pm8001_ha->fw_image->data;
393 	if (!ioctlbuffer)
394 		return -ENOMEM;
395 	if (pm8001_ha->fw_image->size < 28) {
396 		ret = FAIL_FILE_SIZE;
397 		goto out;
398 	}
399 
400 	while (sizeRead < pm8001_ha->fw_image->size) {
401 		partitionSizeTmp =
402 			*(u32 *)((u8 *)&image_hdr->image_length + sizeRead);
403 		partitionSize = be32_to_cpu(partitionSizeTmp);
404 		loopcount = (partitionSize + HEADER_LEN)/IOCTL_BUF_SIZE;
405 		if (loopcount % IOCTL_BUF_SIZE)
406 			loopcount++;
407 		if (loopcount == 0)
408 			loopcount++;
409 		for (loopNumber = 0; loopNumber < loopcount; loopNumber++) {
410 			payload = (struct pm8001_ioctl_payload *)ioctlbuffer;
411 			payload->length = 1024*16;
412 			payload->id = 0;
413 			fwControl =
414 			      (struct fw_control_info *)payload->func_specific;
415 			fwControl->len = IOCTL_BUF_SIZE;   /* IN */
416 			fwControl->size = partitionSize + HEADER_LEN;/* IN */
417 			fwControl->retcode = 0;/* OUT */
418 			fwControl->offset = loopNumber * IOCTL_BUF_SIZE;/*OUT */
419 
420 		/* for the last chunk of data in case file size is not even with
421 		4k, load only the rest*/
422 		if (((loopcount-loopNumber) == 1) &&
423 			((partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE)) {
424 			fwControl->len =
425 				(partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE;
426 			memcpy((u8 *)fwControl->buffer,
427 				(u8 *)pm8001_ha->fw_image->data + sizeRead,
428 				(partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE);
429 			sizeRead +=
430 				(partitionSize + HEADER_LEN) % IOCTL_BUF_SIZE;
431 		} else {
432 			memcpy((u8 *)fwControl->buffer,
433 				(u8 *)pm8001_ha->fw_image->data + sizeRead,
434 				IOCTL_BUF_SIZE);
435 			sizeRead += IOCTL_BUF_SIZE;
436 		}
437 
438 		pm8001_ha->nvmd_completion = &completion;
439 		ret = PM8001_CHIP_DISP->fw_flash_update_req(pm8001_ha, payload);
440 		wait_for_completion(&completion);
441 		if (ret || (fwControl->retcode > FLASH_UPDATE_IN_PROGRESS)) {
442 			ret = fwControl->retcode;
443 			kfree(ioctlbuffer);
444 			ioctlbuffer = NULL;
445 			break;
446 		}
447 	}
448 	if (ret)
449 		break;
450 	partitionNumber++;
451 }
452 out:
453 	kfree(ioctlbuffer);
454 	return ret;
455 }
456 static ssize_t pm8001_store_update_fw(struct device *cdev,
457 				      struct device_attribute *attr,
458 				      const char *buf, size_t count)
459 {
460 	struct Scsi_Host *shost = class_to_shost(cdev);
461 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
462 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
463 	char *cmd_ptr, *filename_ptr;
464 	int res, i;
465 	int flash_command = FLASH_CMD_NONE;
466 	int err = 0;
467 	if (!capable(CAP_SYS_ADMIN))
468 		return -EACCES;
469 
470 	cmd_ptr = kzalloc(count*2, GFP_KERNEL);
471 
472 	if (!cmd_ptr) {
473 		err = FAIL_OUT_MEMORY;
474 		goto out;
475 	}
476 
477 	filename_ptr = cmd_ptr + count;
478 	res = sscanf(buf, "%s %s", cmd_ptr, filename_ptr);
479 	if (res != 2) {
480 		err = FAIL_PARAMETERS;
481 		goto out1;
482 	}
483 
484 	for (i = 0; flash_command_table[i].code != FLASH_CMD_NONE; i++) {
485 		if (!memcmp(flash_command_table[i].command,
486 				 cmd_ptr, strlen(cmd_ptr))) {
487 			flash_command = flash_command_table[i].code;
488 			break;
489 		}
490 	}
491 	if (flash_command == FLASH_CMD_NONE) {
492 		err = FAIL_PARAMETERS;
493 		goto out1;
494 	}
495 
496 	if (pm8001_ha->fw_status == FLASH_IN_PROGRESS) {
497 		err = FLASH_IN_PROGRESS;
498 		goto out1;
499 	}
500 	err = request_firmware(&pm8001_ha->fw_image,
501 			       filename_ptr,
502 			       pm8001_ha->dev);
503 
504 	if (err) {
505 		PM8001_FAIL_DBG(pm8001_ha,
506 			pm8001_printk("Failed to load firmware image file %s,"
507 			" error %d\n", filename_ptr, err));
508 		err = FAIL_OPEN_BIOS_FILE;
509 		goto out1;
510 	}
511 
512 	switch (flash_command) {
513 	case FLASH_CMD_UPDATE:
514 		pm8001_ha->fw_status = FLASH_IN_PROGRESS;
515 		err = pm8001_update_flash(pm8001_ha);
516 		break;
517 	case FLASH_CMD_SET_NVMD:
518 		pm8001_ha->fw_status = FLASH_IN_PROGRESS;
519 		err = pm8001_set_nvmd(pm8001_ha);
520 		break;
521 	default:
522 		pm8001_ha->fw_status = FAIL_PARAMETERS;
523 		err = FAIL_PARAMETERS;
524 		break;
525 	}
526 	release_firmware(pm8001_ha->fw_image);
527 out1:
528 	kfree(cmd_ptr);
529 out:
530 	pm8001_ha->fw_status = err;
531 
532 	if (!err)
533 		return count;
534 	else
535 		return -err;
536 }
537 
538 static ssize_t pm8001_show_update_fw(struct device *cdev,
539 				     struct device_attribute *attr, char *buf)
540 {
541 	int i;
542 	struct Scsi_Host *shost = class_to_shost(cdev);
543 	struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost);
544 	struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
545 
546 	for (i = 0; flash_error_table[i].err_code != 0; i++) {
547 		if (flash_error_table[i].err_code == pm8001_ha->fw_status)
548 			break;
549 	}
550 	if (pm8001_ha->fw_status != FLASH_IN_PROGRESS)
551 		pm8001_ha->fw_status = FLASH_OK;
552 
553 	return snprintf(buf, PAGE_SIZE, "status=%x %s\n",
554 			flash_error_table[i].err_code,
555 			flash_error_table[i].reason);
556 }
557 
558 static DEVICE_ATTR(update_fw, S_IRUGO|S_IWUGO,
559 	pm8001_show_update_fw, pm8001_store_update_fw);
560 struct device_attribute *pm8001_host_attrs[] = {
561 	&dev_attr_interface_rev,
562 	&dev_attr_fw_version,
563 	&dev_attr_update_fw,
564 	&dev_attr_aap_log,
565 	&dev_attr_iop_log,
566 	&dev_attr_max_out_io,
567 	&dev_attr_max_devices,
568 	&dev_attr_max_sg_list,
569 	&dev_attr_sas_spec_support,
570 	&dev_attr_logging_level,
571 	&dev_attr_host_sas_address,
572 	NULL,
573 };
574 
575