Commit Graph

152 Commits

Author SHA1 Message Date
Cao Sen Miao
0b7caf96a9 spi_flash:modify nvs reading writing issue on esp32s3 2021-03-03 22:02:32 +08:00
Cao Sen Miao
f3e79ca166 spi_flash(c3): add boya chip support for suspend feature 2021-01-25 11:14:06 +08:00
Cao Sen Miao
9905da46e0 spi_flash: Add auto suspend mode on esp32c3 2021-01-25 11:14:02 +08:00
KonstantinKondrashov
60e58eaddb spi_flash: Add auto-suspend mode for ESP32-S2
Uses HW auto_wait_idle, HW auto_suspend and SW resume
2021-01-25 11:13:38 +08:00
Angus Gratton
d4c9a45675 spi_flash: Add ESP32-C3 support
Based on internal commit 3ef01301fff
2020-12-17 15:34:13 +11:00
Jakob Hasse
00819a3022 NVS flash: host-based unit test of nvs::Page
* General tests like page loading from flash
* Rough test of fixed-size data types
* Rough test of blob read
* Added coverage target in cmake, also accessible
  via `idf.py coverage`
* Fixed unsigned comparison in comp. enum table
* introducing temporary LINUX_TARGET define
2020-12-14 18:53:14 +08:00
Jakob Hasse
c233ce0449 spi_flash: mocking should be possible now
The following three headers will be mockes:
* esp_flash.h
* esp_spi_flash.h
* esp_partition.h
* counter functions live in own header
* add spi_flash sim dir for esp_err.h to Unity
* modified gen_esp_err_to_name.py to ignore
  sim/ dir in spi_flash component

Add cmock .yaml config file
Add spi hal header until soc can mock the hal
  layer as well.
2020-12-14 18:53:14 +08:00
Jakob Hasse
60dfd87e65 SPI Flash: fix doc error in esp_partition.h 2020-12-10 17:03:56 +08:00
Cao Sen Miao
11188d2143 esp_flash:fix bug about clearing WLE automatically after actions 2020-11-12 16:44:29 +08:00
Angus Gratton
1a35b5ac9b Merge branch 'feat/esp_flash_yield_refactor' into 'master'
esp_flash: refactor to support various type of yield

See merge request espressif/esp-idf!10425
2020-11-12 16:23:02 +08:00
Angus Gratton
66fb5a29bb Whitespace: Automated whitespace fixes (large commit)
Apply the pre-commit hook whitespace fixes to all files in the repo.

(Line endings, blank lines at end of file, trailing whitespace)
2020-11-11 07:36:35 +00:00
Michael (XIAO Xufeng)
8ae09194ac esp_flash: refactor to support various type of yield
There is a periodically yield in the esp_flash driver, to ensure the
cache will not be disabled for too long on ESP32.

On ESP32-S2 and later, we need to support more different kind of yield:

1. polling conditions, including timeout, SW read request, etc.
2. wait for events, including HW done/error/auto-suspend, timeout
semaphore, etc.

The check_yield() and yield() is separated into two parts, because we
may need to insert suspend, etc. between them.
2020-11-10 19:05:22 +08:00
Michael (XIAO Xufeng)
3bacf35310 esp_flash: support high capacity flash chips (32-bit address) 2020-10-29 18:20:11 +08:00
Cao Sen Miao
b9f6efd99a esp_flash: change timeout threshold and can close timeout 2020-10-12 10:43:25 +08:00
Ivan Grokhotkov
96db25c861 Merge branch 'feature/nvs_encryption_s2' into 'master'
NVS: using esp_partition API

Closes IDF-1340 and IDF-858

See merge request espressif/esp-idf!8683
2020-09-16 02:12:54 +08:00
Jakob Hasse
aca9ec28b3 NVS: using esp_partition API
* partition api changed from spi_flash* API to
  esp_partition* API and is abstracted as a C++
  interface.
* The old nvs encryption is still possible
* changed default unit test app partition table
* Partitions coming from esp_partition API are
  checked for generic flash encryption. If yes,
  an error is returned since generic flash
  encryption isn't compatible with nvs
  encryption
* esp32, esp32s2 tests don't require nvs_flash
  but mbedtls now

Closes IDF-1340
Closes IDF-858
2020-09-14 10:34:34 +08:00
Marius Vikhammer
b2f390df01 hal: update link to HAL readme.md
The HAL readme was moved during refactoring, but links were not updated.
2020-09-11 15:48:08 +08:00
Michael (XIAO Xufeng)
2d440e408a esp_flash: fix the data type of delay_us
unsigned can be 16-bit on some architecture, which doesn't meet the
requirements of delaying for several hundreds of us.
2020-08-31 18:10:32 +00:00
Michael (XIAO Xufeng)
c796bd5e63 esp_flash: refactor to make host driver function a const table
This is also part of ESP32-S3 ROM changes
2020-07-13 03:10:00 +08:00
Michael (XIAO Xufeng)
a9c8895bb2 esp_flash: refactor to be compatible with the latest ROM
Including:
1. Change the write bytes/read bytes parameter in the host driver into slicers to meet the requirements of complicated cases.
2. Refactor the esp_flash_api code a bit so that we can use the code in the ROM laster
3. Provide get_temp_buffer and release_temp_buffer in the os_functions when the buffer passed by application cannot be used directly.
4. Make timeout of operations configurable in the chip_driver.
5. Make dummy number configurable.
2020-07-12 02:09:45 +08:00
Ivan Grokhotkov
03bb2774d9 spi_flash: don't call vTaskDelay in non-os context
Fixes regression in core dump, when a crash happens in interrupt
context.
2020-06-02 15:42:24 +02:00
Michael (XIAO Xufeng)
651eb1a694 esp_flash: fix the write performance regression
Also changed internal delay unit into microsecond.
2020-05-17 22:06:02 +08:00
Michael (XIAO Xufeng)
dae3196157 esp_flash: fix issue that cannot add flash on SPI1 CS1 when SPI_FLASH_SHARE_SPI1_BUS is disabled 2020-05-17 22:06:00 +08:00
michael
fdf983e0c4 spi: fix config break and reduce overhead of the bus lock on SPI1
The SPI bus lock on SPI1 introduces two side effects:

1. The device lock for the main flash requires the
`CONFIG_FREERTOS_SUPPORT_STATIC_ALLOCATION` to be selected, however this
option is disabled by default in earlier IDF versions. Some developers
may find their project cannot be built by their old sdkconfig files.

2. Usually we don't need the lock on the SPI1 bus, due to it's
restrictions. However the overhead still exists in this case, the IRAM
cost for static version of semaphore functions, and the time cost when
getting and releasing the lock.

This commit:

1. Add a CONFIG_SPI_FLASH_BYPASS_MAIN_LOCK option, which will forbid the
space cost, as well as the initialization of the main bus lock.

2. When the option is not selected, the bus lock is used, the
`CONFIG_FREERTOS_SUPPORT_STATIC_ALLOCATION` will be selected explicitly.

3. Revert default value of `CONFIG_FREERTOS_SUPPORT_STATIC_ALLOCATION`
to `n`.

introduced in 49a48644e4.

Closes https://github.com/espressif/esp-idf/issues/5046
2020-04-22 16:06:13 +08:00
Michael (XIAO Xufeng)
9d9d22c920 esp_flash: deprecate the cs_id member, which is no longer used.
We used to manually specify the CS id. However after the SPI bus lock is
introduced, the lock is responsible to assign the CS lines and provide
the CS id. The esp_flash driver now depends on the ID assigned by the
SPI bus lock, the configuration field is deprecated.
2020-04-17 18:15:33 +08:00
Michael (XIAO Xufeng)
61ce037fc1 Merge branch 'feat/esp_flash_support_mxic' into 'master'
esp_flash: support MXIC flash chips

See merge request espressif/esp-idf!8037
2020-04-03 16:04:49 +08:00
Angus Gratton
d76bf19ffd docs: Explain custom partition types/subtypes in more detail
Including how to use with C++ (closes https://github.com/espressif/esp-idf/pull/1832)
2020-04-02 10:00:17 +11:00
Michael (XIAO Xufeng)
3b429766bc esp_flash: support MXIC flash chips
The default chip driver (chip_generic) use command 01H + 2 bytes to
clear the QE bit. However this will accidently change the configuration
register value of the MXIC chip.

MXIC chip driver is added to fix that.
2020-04-01 20:54:23 +08:00
Michael (XIAO Xufeng)
49a48644e4 spi: allow using esp_flash and spi_master driver on the same bus 2020-03-26 22:08:26 +08:00
Angus Gratton
fb340940d3 spi_flash: Fix over-allocation and OOM crash when reading from SPI flash to PSRAM buffers
Previously would try allocate buffer of minimum size 16KB not maximum size 16KB, causing
out of memory errors for any large reads, or if less than 16KB contiguous free heap.

Also, if using legacy API and internal allocation failed then implementation would abort()
instead of returning the error to the caller.

Added test for using large buffers in PSRAM.

Closes https://github.com/espressif/esp-idf/issues/4769

Also reported on forum: https://esp32.com/viewtopic.php?f=13&t=14304&p=55972
2020-03-03 00:17:27 +00:00
Renz Christian Bagaporo
e6ad330018 ble_mesh_wifi_coexist example: Disable Wi-Fi RX IRAM optimisation
Otherwise IRAM usage is too high in this example.
2019-11-28 09:20:00 +08:00
Gabriel Durante
5f0d257240 Added Cpp compatibility for components/spi_flash/include/esp_flash_spi_init.h
Merges https://github.com/espressif/esp-idf/pull/4260
2019-11-05 14:52:57 +01:00
Angus Gratton
8675a818f9 Merge branch 'master' into feature/esp32s2beta_merge 2019-10-22 13:51:49 +11:00
Michael (XIAO Xufeng)
eb104aa16f esp_flash: fix the quad issue for some GD flash chips
The GD flash with product ID 40H, is already used in Wrover-nosufix modules.
2019-10-14 17:25:59 +08:00
Michael (XIAO Xufeng)
571864e8ae esp_flash: fix set qe bit and write command issues
There used to be dummy phase before out phase in common command
transactions. This corrupts the data.

The code before never actually operate (clear) the QE bit, once it finds
the QE bit is set. It's hard to check whether the QE set/disable
functions work well.

This commit:

1. Cancel the dummy phase

2. Set and clear the QE bit according to chip settings, allowing tests
   for QE bits. However for some chips (Winbond for example), it's not
   forced to clear the QE bit if not able to.

3. Also refactor to allow chip_generic and other chips to share the same
   code to read and write qe bit; let common command and read command share
   configure_host_io_mode.

4. Rename read mode to io mode since maybe we will write data with quad
   mode one day.
2019-10-14 17:25:58 +08:00
Angus Gratton
adfc06a530 Merge branch 'master' into feature/esp32s2beta_merge 2019-09-20 10:28:37 +10:00
Angus Gratton
438d513a95 Merge branch 'master' into feature/esp32s2beta_merge 2019-09-16 16:18:48 +10:00
Michael (XIAO Xufeng)
511820820e esp_flash: fix the coredump issue
During coredump, dangerous-area-checking should be disabled, and cache
disabling should be replaced by a safer version.

Dangerous-area-checking used to be in the HAL, but it seems to be more
fit to os functions. So it's moved to os functions. Interfaces are
provided to switch between os functions during coredump.
2019-09-14 17:01:36 +08:00
Michael (XIAO Xufeng)
6139864a4c esp_flash: fix coredump for legacy spi flash API
When legacy mode is used, the coredump still fails during linking
because "esp_flash_init_default_chip", "esp_flash_app_init" and
"esp_flash_default_chip " are not compiled and linked.

Instead of using ``if`` macros in callers, these functions are protected
by ``if`` macros in the header, and also not compiled in the sources.
"esp_flash_default_chip" variable is compiled with safe default value.
2019-09-14 16:56:31 +08:00
Michael (XIAO Xufeng)
d008c47dac esp_flash: add support for encrypted read and write
Using legacy implementation.
2019-09-12 12:41:50 +08:00
Alex Lisitsyn
7ff9538c48 espcoredump: fix issue with spi_flash access
spi_flash has been updated and its functions work from flash by default instead of IRAM that cause issue
add Kconfig value into espcoredump to enable spi_flash legacy mode (CONFIG_SPI_FLASH_USE_LEGACY_IMPL) when core dump is selected
fix spi_flash issues to work correctly with legacy mode when CONFIG_SPI_FLASH_USE_LEGACY_IMPL is used
2019-09-06 15:37:55 +08:00
Angus Gratton
6990a7cd54 Merge branch 'master' into feature/esp32s2beta_update 2019-08-19 15:03:43 +10:00
Michael (XIAO Xufeng)
e947522f38 esp_flash: improve the comments a bit 2019-08-08 23:18:01 +08:00
Michael (XIAO Xufeng)
e5704ab1a8 esp_flash: fix the set/get write protection functions
Add support for get write protection support, fixed the duplicated
set_write_protection link.

All the write_protection check in the top layer are removed. The lower
levels (chip) should ensure to disable write protection before the
operation start.
2019-08-08 23:18:00 +08:00
Angus Gratton
04ae56806c Merge branch 'master' into feature/esp32s2beta_update 2019-08-08 15:26:58 +10:00
Angus Gratton
24d26fccde Merge branch 'master' into feature/esp32s2beta_update 2019-08-08 13:44:24 +10:00
Anton Maklakov
afbaf74007 tools: Mass fixing of empty prototypes (for -Wstrict-prototypes) 2019-08-01 16:28:56 +07:00
Martin Thierer
d6c2dad101 esp_partition_erase_range(): rename parameter "start_addr" to "offset"
The name "start_addr" (which goes straight into the docs) implies
it's an absolute address while in fact it's an offset into the
partition like what's used in all the other esp_partition_*
functions.

So in order to avoid confusion make the name consistent with the
parameter names used for the other partition functions and call it
"offset".

Merges https://github.com/espressif/esp-idf/pull/3750
2019-07-08 17:29:05 +10:00
Ivan Grokhotkov
1c17558e6e spi_flash: use same argument types in .h and .c files
Fixes compilations on targets where size_t != uint32_t
2019-07-02 10:26:06 +02:00
Ivan Grokhotkov
ec427a5b43 spi_flash: support for partitions in external flash 2019-07-02 10:26:06 +02:00
Michael (XIAO Xufeng)
d6bd24ca67 esp_flash: add initialization interface for SPI devices 2019-06-27 13:27:27 +08:00
Michael (XIAO Xufeng)
37cb673cd7 esp_flash: update the document to the latest API 2019-06-20 11:50:23 +08:00
Ivan Grokhotkov
026533cd72 esp_flash: fix C++ compilation and some typos 2019-06-20 10:55:13 +08:00
Michael (XIAO Xufeng)
caf121e4b6 esp_flash: break the inappropriate include chain in spi_flash_host_drv.h 2019-06-20 10:55:12 +08:00
suda-morris
3f7a571c90 fix errors when ci testing for esp32 2019-06-19 15:31:47 +08:00
Michael (XIAO Xufeng)
1036a091fe spi_flash: support working on differnt buses and frequency 2019-06-18 06:32:52 +00:00
Angus Gratton
ce4de867d6 spi_flash: New low-level flash API 2019-06-18 06:32:52 +00:00
Roland Dobai
22d070e0af spi_flash: Rename long Kconfig options 2019-06-12 08:03:07 +02:00
suda-morris
84b2f9f14d build and link hello-world for esp32s2beta 2019-06-11 13:07:37 +08:00
Konstantin Kondrashov
e916cf52a3 bootloader: Add support of anti-rollback
Added:
* set a secure version in app/bootloader.
* description anti-rollback to ota part
* emulate the secure_version write and read operations
* efuse_em partition.
* a description about a rollback for native_ota_example.

Closes: TW26335
2019-02-14 18:51:43 +08:00
Alexey Gerenkov
78a7a152d1 esp32: Fixes freezing core dump process when flash write address checks are enabled 2018-11-15 06:13:48 +00:00
Mahavir Jain
b3aff63db4 app_update: fix intermittent failure with firmware updates
Routine `spi_flash_cache2phys` sometimes return incorrect value,
resulting in failure in getting currently running ota partition.
This in turn aborts firmware update process.This issue was more
prominent with SPIRAM enabled cases.

Fix ensures proper cache guards during `spi_flash_cache2phys`, and
also for few other similar APIs.

In addition, `esp_ota_get_running_partition` has also been optimized
to save currently running partition for subsequent invocations.

Fixes https://github.com/espressif/esp-idf/issues/2451
2018-10-18 04:38:31 +00:00
Sagar Bijwe
48fccbf5dd nvs_flash: Add support for nvs encryption 2018-09-24 11:25:21 +05:30
Konstantin Kondrashov
117c79eae5 app_update: Add API for getting sha256_of_partition
Added bootloader_common_get_sha256_of_partition() and esp_partition_get_sha256() - get or calculate SHA-256
digest for app and data partitions.
Added bootloader_sha256_hex_to_str() - helps to print SHA-256 digest
Added esp_partition_check_identity() - compares two partitions by SHA-256 digest

Refactoring a function esp_image_load() in bootloader space to esp_image_verify() and
bootloader_load_image(). Old name function esp_image_load is deprecated
and will remove in V4.0 version.

spi_flash/sim: Fix error test_host. Add stub for bootloader_common_get_sha256_of_partition in sim/stubs
2018-08-13 13:59:07 +05:00
Ivan Grokhotkov
79e7f02286 spi_flash: allocate mmap pages array in internal memory
* spi_flash_mmap_pages needs pages array to be in internal memory.
  Document and check this.

* Fix a bug that spi_flash_mmap did not allocate pages array in
  internal memory.

* Minor style fixes: const-ify pages argument of spi_flash_mmap, add
  spaces around operators, mark output arguments with [out].

Closes https://github.com/espressif/esp-idf/issues/2229.
2018-07-31 13:11:04 +03:00
Tian Zhong Xing
fa68774344 spi_flash:
1. add test code for new api
2. resolve some comments
2018-03-26 10:24:42 +08:00
Tian Zhong Xing
7555031553 add api get valid mmu table pages number 2018-03-16 10:40:55 +08:00
Angus Gratton
b52b4ea2cc spi_flash: Update docs 2018-02-22 10:28:26 +11:00
Angus Gratton
7a924bd85a spi_flash: Expose an accessor the current SPI flash guard functions
Change places which uses g_flash_guard_default_ops to use this. Probably exact same data, but a bit
cleaner.
2017-11-20 15:54:31 +11:00
Angus Gratton
e72e5a9706 spi_flash: Make spi_flash op_lock/op_unlock recursive
Allows chaining of multiple flash operations as an atomic operation.
2017-11-20 15:54:31 +11:00
Jeroen Domburg
113bb30218 This commit adds spi_flash_mmap_pages(), a function to map a set of unordered 64K pages in flash into a contiguous region in memory space. 2017-06-23 14:28:57 +08:00
Angus Gratton
3442d4d463 spi_flash: Add spi_flash_cache_enabled() test function 2017-03-03 15:33:23 +11:00
Angus Gratton
902382f622 ota ops: Verify partition argument passed to esp_ota_begin() 2017-02-22 10:26:04 +11:00
Angus Gratton
25f739c183 ota ops: Add new functions esp_ota_get_next_update_partition / esp_ota_get_running_partition
* Update OTA example to use these.
* Refactor esp_ota_begin() to return ESP_ERR_OTA_PARTITION_CONFLICT as documented
2017-02-22 10:24:42 +11:00
Angus Gratton
093dd98101 spi_flash: Add new phys2cache & cache2phys functions to query flash cache mappings 2017-02-22 10:22:50 +11:00
Alexey Gerenkov
04acc88023 esp32: Fixes watchdog problem when printing core dump to uart
Also fixes generation of core dumps when flash cache is disabled
2017-02-01 18:39:28 +03:00
Angus Gratton
d4462664b7 spi_flash: Move FLASH_PAGE_SIZE constant into esp_spi_flash.h 2017-01-20 19:50:01 +08:00
Angus Gratton
14aa1d1b3e docs: spi_flash: Add flash encryption ops, remove boilerplate 2017-01-20 19:50:01 +08:00
Angus Gratton
adc590ff69 spi_flash_write_encrypted: Allow 16-byte aligned block writes
As each 32 byte write has two identical 16 byte AES blocks, it's
possible to write them separately.
2017-01-20 19:48:46 +08:00
Angus Gratton
95c150fe2c spiflash: Add spi_flash_read_encrypted() function 2017-01-20 19:48:46 +08:00
Alexey Gerenkov
50b3ce616f esp32: Adds documentation and comments to core dump feature files 2017-01-11 20:51:28 +03:00
Alexey Gerenkov
39ddc7b836 esp32: Fixes several issues in core dump feature
1) PS is fixed up to allow GDB backtrace to work properly
2) MR!341 discussion: in core dump module: esp_panicPutXXX was replaced by ets_printf.
3) MR!341 discussion: core dump flash magic number was changed.
4) MR!341 discussion: SPI flash access API was redesigned to allow flexible critical section management.
5) test app for core dump feature was added
6) fixed base64 file reading issues on Windows platform
7) now raw bin core file is deleted upon core loader failure by epscoredump.py
2017-01-11 20:51:28 +03:00
Alexey Gerenkov
4a3e160888 esp32: Add core dump saving to flash feature
Complimentary changes:
1) Partition table definitions files with core dump partition
2) Special sub-type for core dump partition
3) Special version of spi_flash_xxx
4) espcoredump.py is script to get core dump from flash and print useful info
5) FreeRTOS API was extended to get tasks snapshots
2017-01-11 20:51:28 +03:00
Angus Gratton
ab5915ff8b spi_flash: Standardise argument types & names used for flash offsets
Closes github #88: https://github.com/espressif/esp-idf/issues/88
2016-12-22 15:07:02 +11:00
Deomid Ryabkov
d288a3d053 Remove alignment reqs from spi_flash_{read,write} 2016-12-15 10:07:31 +11:00
Angus Gratton
9eb135fd73 Flash encryption: Support enabling flash encryption in bootloader, app support
* App access functions are all flash encryption-aware
* Documentation for flash encryption
* Partition read/write is flash aware
* New encrypted write function
2016-12-01 23:49:12 -08:00
Ivan Grokhotkov
0b265dc2a7 nvs, spi_flash: handle case when source data is in DROM 2016-11-18 20:11:17 +08:00
Ivan Grokhotkov
13d4734399 docs: fix Doxygen warnings, fail CI build on Doxygen warnings 2016-11-16 22:44:22 +08:00
Ivan Grokhotkov
2119b98469 spi_flash: remove unnecessary src pointer alignment check in spi_flash_write
ROM SPIWrite routine can work with unaligned sources, so this check is unnecessary.
Furthermore, it breaks nvs_set_str and nvs_get_blob when data pointer is unaligned.
Also fix stray backslash in COUNTER_STOP macro
2016-10-31 19:08:56 +08:00
Ivan Grokhotkov
dc2b5d0c96 spi_flash: update comment blocks 2016-10-27 17:58:42 +08:00
Ivan Grokhotkov
c581229e1d partition API: separate type and subtype into two enums 2016-10-27 17:58:42 +08:00
Ivan Grokhotkov
9f0f05d520 spi_flash: change pointer type to void* 2016-10-27 17:58:42 +08:00
Ivan Grokhotkov
e03b45eb0a spi_flash: improve documentation 2016-10-27 17:58:42 +08:00
Ivan Grokhotkov
b6693225c1 spi_flash: implement partition API, drop trivial wrappers
This implements esp_partition_read, esp_partition_write, esp_partition_erase_range, esp_partition_mmap.
Also removed getters which didn't add much sugar after all.
2016-10-27 17:58:42 +08:00
Ivan Grokhotkov
2c5340d47e spi_flash: change argument types
spi_flash_read and spi_flash_write currently have a limitation that source and destination must be word-aligned.
This can be fixed by adding code paths for various unaligned scenarios, but function signatures also need to be adjusted.
As a first step (since we are pre-1.0 and can still change function signatures) alignment checks are added, and pointer types are relaxed to uint8_t.
Later we will add handling of unaligned operations.
This change also introduces spi_flash_erase_range and spi_flash_get_chip_size functions.

We probably need something like spi_flash_chip_size_detect which will detect actual chip size.
This is to allow single application binary to be used on a variety of boards and modules.
2016-10-27 17:58:42 +08:00
Ivan Grokhotkov
079d9ea018 spi_flash: implement partition API 2016-10-27 17:58:42 +08:00
Ivan Grokhotkov
42068c3b36 spi_flash: implement mmap/munmap 2016-10-27 17:57:29 +08:00
Ivan Grokhotkov
f6f23141b3 components/spi_flash: add high level partition api header
TW6701
2016-10-27 17:57:29 +08:00
Ivan Grokhotkov
f2149eabee components/spi_flash: add flash operation counters option to Kconfig 2016-09-23 08:44:45 +08:00
Ivan Grokhotkov
ba75f837b8 components/spi_flash: add performance counters 2016-09-22 10:39:36 +08:00