Commit Graph

1160 Commits

Author SHA1 Message Date
Randall Spangler
c3cd10937e WIP - Nuvoton 30-Jan patch
Issues fixed on 0216:
1.Modified CONFIG_KEYBOARD_COL2_INVERTED support in keyboard_raw.c
2.Modified warm_reset checking in gpio.c
3.Modified system_get_chip_name in system.c for package info.
4.Modified fan.c and pwm.c for:
● If the DCRn value is greater than the CTRn value, the PWM_n signal is always low.
● Fan stall condition event:
  If the measured fan speed is lower than the lowLimit value (unless the Fan Speed Low Limit value is 0) or in case of erroneous measurement, the userCallback is called.
5. Change cycle_pluses to 480 in board.c

Issues fixed:
1. Jump data at top of RAM is getting corrupted.  Changed the flag to
RESET_FLAG_RESET_PIN.  Added a workaround method to fix VCC1_RST
issue.

2. Hibernate wake need to report whether wake reason was GPIO or RTC

3. Hibernate wake must be distinguishable from watchdog reset.  The
booter will log reset reason in Code RAM.  I copy the log data to
battery-backup RAM in little FW.  And system driver will refer this
data to distinguish if it's watchdog reset or not.

4. Watchdog reset flag is not set.  Same fix as 3.

5. Should return error if unable to clear SPI flash status register.

6. Remove chip_temp_sensor.c

7. Remove use of pstate from flash driver

8. Remove support for watchdog warm reset

9. Keyboard raw driver must support COL2 inverted

10. LPC memory mapped data must be read-only from host

11. LPC should support PLTRST# signal

12. Problems reading chip type/version.  Use core registers and ROM data to read IDs.

13. When chip type/version is unknown, report hex value.

14. Watchdog does not consistently print panic information.

15. Remove console force enable logic.

16. Enable only the peripheral clocks that are needed.  Please notice
user should add bit mask in CGC_XXX_MASK if they want to enable
additional module.  For example, if user wants to enable PWM3, he must
add PWDWN_CTL2_PWM3_PD bit in CGC_PWM_MASK.

Please see HOOK_FREQ_CHANGE and HOOK_INIT these two hook functions.
If I turn off all I2C modules in system_pre_init and turn on the
modules I need in i2c_init, I found its freq is not correct.  The root
cause is hook_notify(HOOK_FREQ_CHANGE) is executed first (in
clock_init) before i2c_init.  At this time, i2c modules are power-down
and writing to freq register is useless.  I re-execute freq-changed
hook function after turning on modules again.

17. MPU properly configured to prevent code execution from data RAM

18. Partial nvcontext implementation.  Copy these 16 bytes in our battery-backup RAM.

Additional items we also modified:

1. pwm.c: Support open-drain IO type of PWM.  (PWM IO-Type cannot by
determined by GPIO, we use bit 1 & 2 of function byte of gpio_alt_func
array to support it)

2. ec_npcxflash.c: Use definition to replace constant value.  Stop
watchdog during flash programing.

3. npcx_cmds.tcl: Adjust script sequence for robustness.  Add unlock
MPU commands for Data RAM.

BUG=chrome-os-partner:34346
BRANCH=none
TEST=manually verify changes

Change-Id: I722a77d29e7543b054819480c7b7477af4263119
Signed-off-by: Ian Chao <mlchao@nuvoton.com>
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/248670
2015-02-25 03:33:08 +00:00
Anton Staaf
d2964ba0cf USART: Add STM32F3 support and fix STM32F baud rate bug
Previously the STM32F3 support was non-functional due to
it being a cut and paste of the STM32F0, and the clocks
are not set up the same way on the two platforms.  Also,
the STM32F initialization code was incorrectly calling
the F0/L buad rate setup code.

This change has the variant specific USART code pass the
input frequency to the baud rate divisor clock to the
baud rate setup code, instead of that code calling
clock_get_freq() to determine the input clock frequency.
This is required because the STM32F3 is not configured
such that the clock_get_freq value and the input to
the USART baud rate divisor match.

Signed-off-by: Anton Staaf <robotboy@chromium.org>

BRANCH=None
BUG=None
TEST=make buildall -j
     Verify USART works on discovery as well as Ryu

Change-Id: I71248d83b53969d0e7020747a9bb9570803f30ac
Reviewed-on: https://chromium-review.googlesource.com/250920
Reviewed-by: Vic Yang <victoryang@chromium.org>
Trybot-Ready: Anton Staaf <robotboy@chromium.org>
Tested-by: Anton Staaf <robotboy@chromium.org>
Commit-Queue: Anton Staaf <robotboy@chromium.org>
2015-02-24 03:08:07 +00:00
Alec Berg
3dffafac68 stm32f0: fix handling of RTC alarm 24 hour rollover
Fix bug in RTC module for stm32f0 in which it doesn't handle the
24 hour rollover appropriately and can cause a watchdog reset
if in deep sleep during rollover.

BUG=chrome-os-partner:36920
BRANCH=samus
TEST=add line to rtc_init()
STM32_RTC_TR = 0x00235952
This initializes RTC clock to 8 seconds before rollover. Using samus
make sure unit is allowed to go to deep sleep (S3/S5 and not charging)
and see that without this CL we watchdog most of the time, and with
this CL we don't watchdog ever.

Change-Id: I3f4b4b1ab7b2be1d4e344477d5eaaa0dc916773a
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/251852
Reviewed-by: Alexandru Stan <amstan@chromium.org>
2015-02-22 01:45:29 +00:00
Vic Yang
1ef0f27e65 stm32f3: Allow per-board ADC sampling time
Depending on the hardware, each ADC channel may need a different
sampling time. To keep things simple, let's allow per-board ADC sampling
time configuration instead of per-channel configuration.

BRANCH=Ryu
BUG=None
TEST=Configure sampling time to 3 and measure IADP on Ryu P4 and check
it's more accurate.

Change-Id: I3c1eeea22439c0340f84fdeb3624fc84450358ca
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/251701
Tested-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-02-21 09:19:57 +00:00
Bill Richardson
02013f6aa3 cr50: Separate ARM core GPIOs from pinmux configuration
This separates the configuration of the ARM core GPIOs from the
routing of internal peripherals to external pins. Both are still
described in the gpio.inc file, but are less dependent on each
other.

BUG=chrome-os-partner:33818
BRANCH=none
TEST=manual

Before this CL, running "sysjump rw" or trying to use more than 8
GPIOs caused hangs and reboots. Now it doesn't.

Change-Id: If962a7c5ad4136837b2ea00ae016a440f07d7e23
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/251015
Reviewed-by: Sheng-liang Song <ssl@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2015-02-20 03:00:04 +00:00
Alexandru M Stan
3ae7240410 hwtimer/hwtimer32: Remove task_resched_if_needed from watchdog help
Remove task_resched_if_needed, since we don't do any task scheduling
modifications. Just return instead.

This makes it work on F0 as well, where we don't have task_resched_if_needed

BUG=None
TEST=With series, see watchdog help work on any veyron
BRANCH=veyron

Change-Id: I93cce722b6d53008b015c7cdd56b7e77dc07bbff
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/242713
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
(cherry picked from commit 8363dfb14cb36fca412132ab14d2c9451de7d94e)
Reviewed-on: https://chromium-review.googlesource.com/250671
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
2015-02-18 23:52:44 +00:00
Vincent Palatin
4b774f07d3 make idlestats console command optional
To save flash space, disable "idlestats" console command on samus_pd.
This saves 384 B of flash

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=chrome-os-partner:34489
TEST=make buildall and check firmware size.
=== build/samus_pd/ BASELINE ===
FLASH 57.8k / 60.0k  [ text 48.0k rodat  9.7k data  0.1k ]
RAM   11.8k / 16.0k  [ data  0.1k bss   11.7k ]

=== #undef CONFIG_CMD_IDLE_STATS ===
FLASH 57.4k / 60.0k  [ text 47.9k rodat  9.4k data  0.1k ]
RAM   11.8k / 16.0k  [ data  0.1k bss   11.7k ]

Change-Id: Iba9654a88ec195026945881bc2687a1e67747706
Reviewed-on: https://chromium-review.googlesource.com/241452
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Alec Berg <alecaberg@chromium.org>
Tested-by: Alec Berg <alecaberg@chromium.org>
2015-02-18 04:52:49 +00:00
Anton Staaf
6c83a4d3a5 USB: fix memcpy_to_usbram
A change to the toolchain or environment surfaced an issue where the writes to
packet RAM were being split into two 16-bit writes.  This was interacting
poorly with the AHB2APB bridge.

Marking the packet RAM destination pointer volatile forces the compiler to use
full 32-bit writes.

Signed-off-by: Anton Staaf <robotboy@chromium.org>

BRANCH=None
BUG=None
TEST=make buildall -j
     Check that Ryu's console is accessible over USB

Change-Id: I0c3db08c704389a627570b90ef97bce81ab553fa
Reviewed-on: https://chromium-review.googlesource.com/248840
Trybot-Ready: Anton Staaf <robotboy@chromium.org>
Tested-by: Anton Staaf <robotboy@chromium.org>
Reviewed-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Anton Staaf <robotboy@chromium.org>
2015-02-17 18:19:14 +00:00
Alec Berg
2e6bee5642 stm32f0: Change idle task warning printf to save stack space
Change the idle task overslept warning printf to save stack space.
The current warning uses CPRINTF which adds too much to the stack
and overflows the idle stack.

BUG=chrome-os-partner:33138, chrome-os-partner:36636
BRANCH=samus
TEST=comment out the if (margin_us < 0) check and always print
warning message. Without this CL stack overflows. With this CL,
stack does not overflow and gets to 168/256, which is plenty of
headroom considering the task doesn't do much.

Change-Id: I19a8336b8584d2a1342e7b9290aad471d326a060
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/250300
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
2015-02-16 23:58:11 +00:00
Alexandru M Stan
80778ad0eb cortex-m0: Add deferred scheduler
If 2 interrupts happen at the same time, there is a chance that the nested
interrupt will not call svc_handler when it needs to. In extreme cases this
could lead to tasks not getting woken up when they're supposed to and watchdog
resetting.

The reason stuff worked was because there were enough other interrupts
around to eventually call the scheduler and switch to the ready task.

This change modifies the interrupt calls to not call the scheduler directly
(because in nested interrupt situation this causes problems), but defer the
call to scheduling until after the irq finishes by triggering a low priority
interrupt which will for sure call svc_host at the end. The PendSV irq was
used for this purpose.

BUG=chrome-os-partner:36193
TEST=No more SPI errors caused by scheduler problems
TEST=usleeps now are more accurate, they're guaranteed to not take forever now
BRANCH=veyron

Change-Id: I42acde6b3eb7be2540a0de9a8562dee2ea2be7ab
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/248902
Tested-by: Alec Berg <alecaberg@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Alec Berg <alecaberg@chromium.org>
2015-02-12 06:44:04 +00:00
Anton Staaf
41ee615c0b USB: Fix cut and paste bug for board specific disconnection
Signed-off-by: Anton Staaf <robotboy@chromium.org>

BRANCH=None
BUG=None
TEST=make buildall -j

Change-Id: I8ec4396370b7e3068d29d569b73fddc648e1f76f
Reviewed-on: https://chromium-review.googlesource.com/247720
Trybot-Ready: Anton Staaf <robotboy@chromium.org>
Tested-by: Anton Staaf <robotboy@chromium.org>
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Anton Staaf <robotboy@chromium.org>
2015-02-10 23:07:09 +00:00
Vic Yang
049463f8ad stm32: Add delay after enabling peripheral clock
We need a dummy read after enabling AHB peripheral clock before we can
access the peripheral. For APB, we also need a dummy read for STM32F3.

BRANCH=All affected
BUG=chrome-os-partner:33007
TEST=make buildall

Change-Id: I47f4a024dca294f555428c3f2053c1d32835ebe0
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/246181
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-02-10 10:47:07 +00:00
Vic Yang
9ed4434ad8 mec1322: Fix LPC interrupt bit mask
LRESET# interrupt should be GIRQ19 bit 0 instead of bit 1.

BRANCH=None
BUG=chrome-os-partner:36326
TEST=Run on Glower and doesn't see LRESET# interrupt storm.

Change-Id: I1adedea63e9ec2851e1e09fc8c0eb8185070dad1
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/247790
Tested-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-02-10 06:47:44 +00:00
Myles Watson
4ada7739f9 nrf51: implement soft reset and hard reset
TEST=manual test with the console command.  Reset flags are set correctly.
BRANCH=NONE
BUG=None

Change-Id: I3ea4301206be6fe4e79a4b49c002c020980c516d
Signed-off-by: Myles Watson <mylesgw@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/242901
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
2015-01-24 00:32:25 +00:00
Myles Watson
ad06ead062 nrf51: add the watchdog registers.
The definitions for the watchdog registers are needed for hard reset.

BRANCH=NONE
BUG=None
TEST=make buildall -j

Change-Id: Ief73b98fbe6fc198c3eda28394e76bdf05568fef
Signed-off-by: Myles Watson <mylesgw@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/242900
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2015-01-24 00:32:21 +00:00
Vincent Palatin
ad03068620 lm4: workaround to force __enter_hibernate in SRAM
The new toolchain is putting again the __enter_hibernate function in
flash (.text) rather than in SRAM (.iram.text) after inlining both the
hibernate() and __enter_hibernate() function.
Workaround this issue by forcing "noinline" on __enter_hibernate().

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=all
BUG=chrome-os-partner:35774
TEST=make BOARD=samus dis
and check the disassembly, the __enter_hibernate is called in SRAM
through a veneer.

Change-Id: I015928ebe18ba8fd93252eece3e8a0fcf4b2a037
Reviewed-on: https://chromium-review.googlesource.com/242691
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
2015-01-23 19:56:32 +00:00
Vincent Palatin
da733f3aae lm4: ignore overlapping LPC commands
If the AP ignores the LPC_ST_BUSY bit (which is software-defined) and
tries to send a second host command while the first one is still
processed, we discard it.
This doesn't prevent the host to re-write the command arguments stored
in LPC shared mem (aka LPC_POOL_CMD_DATA) but when we will call
host_packet_receive, we will have either the old arguments or the new
arguments (or even a mix of both, which is less unlikely to pass the
checksum check), and we will copy them once before calling the HOSTCMD
task. So the host command task will have a single coherent (not
changing) view of the arguments when performing its input validation.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=chrome-os-partner:31492 chrome-os-partner:23806
TEST=Boot Samus and play with ectool

Change-Id: I9aa1b8cdac05e323b91998188bd873826e83c274
Reviewed-on: https://chromium-review.googlesource.com/242593
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
2015-01-23 00:28:45 +00:00
Vic Yang
f2518b9f2d mec1322: Move default header location to 0x0
The current header location is too large for small SPI flash chips.
Since this value is only used for private EC SPI, it doesn't really
matter what it is. Let's just move it to 0x0.

Note that this doesn't affect shared SPI case, as we need a more
sophisticated packer for that.

BRANCH=None
BUG=chrome-os-partner:35308
TEST=Build for Glower and check the size of ec.spi.bin.

Change-Id: I96871d1677999e7cc1c7385b749563b8c09a318a
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/241114
Tested-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-01-17 01:00:12 +00:00
Vic Yang
1d0a7f8713 mec1322: Fix I2C interrupt bug
On boot, we shouldn't enabled I2C interrupt. The interrupt is only
enabled when we are waiting for data or transfer completion.

BRANCH=None
BUG=chrome-os-partner:35308
TEST=Boot on Glower and do i2cscan.

Change-Id: I534302ac057f2592f52d80d85cee66c35c6121d2
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/241113
Tested-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-01-17 01:00:07 +00:00
Vic Yang
7e8567fd5e mec1322: Clear interrupt status before enabling GPIO interrupt
Before enabling GPIO interrupts on boot, we should clear pending
interrupt status to make sure the interrupts don't fire unexpectedly.

BRANCH=None
BUG=chrome-os-partner:35308
TEST=Boot on Glower and make sure GPIO interrupts aren't triggered on
boot.

Change-Id: I2729b4a5046063e4ee4c08dcb7084a329bfdf042
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/241112
Tested-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-01-17 01:00:02 +00:00
Vic Yang
535bbbb774 mec1322: Specify SPI flash size in KB
For boards without a shared SPI, it's reasonable to use a SPI flash
smaller than 1MB. Change the script to allow this.

BRANCH=None
BUG=chrome-os-partner:35308
TEST=Build strago and check the size of ec.spi.bin.

Change-Id: Iabf7065d158be5f82c55e182e430858a12b18b6e
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/241111
Tested-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-01-16 22:58:02 +00:00
Alexandru M Stan
fe294979d6 I2C: Increase priority of i2c_init
Chipset sometimes needs I2C, therefore i2c_init should have a higher priority
than power_common_init so i2c is available by the time the chipset might be
talking to the battery.

BUG=chrome-os-partner:35502, chrome-os-partner:35173
TEST=There is no "battery not responding" message at startup on veyron
TEST=EC boot takes less than 1 second on veyron
BRANCH=none

Change-Id: Ib10b653decc7703e706d4dd1976abf0fdbc25ac2
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/241102
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2015-01-16 20:37:07 +00:00
Vincent Palatin
34f927724f stm32: remove useless modulo
The RTC delay is always less than a day (see the assert at the beginning
of set_rtc_alarm), so remove the useless module to save a few bytes of
flash.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=none
TEST=make buildall
and see the zinger firmware is smaller by 16 bytes
(more than the 8 bytes I need to submit the following CL)

Change-Id: If0374ff5897f13e69574018d2123428075b2264e
Reviewed-on: https://chromium-review.googlesource.com/240564
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
2015-01-14 21:50:06 +00:00
Myles Watson
16eaf5cfde nrf51: Fix a race condition in hwtimer.c
The check for overflow was originally in __hw_clock_source_read()

If it got interrupted, it would frequently see an overflow, because
"prev_read" would be less than "now".

1 - Use the comparator to check for overflow.
2 - Only check for overflow in the interrupt handler.

BUG=chrome-os-partner:35312
BRANCH=none
TEST=make buildall -j
use the keyboard code to type
use a console command "forcetime", to force the system time to overflow soon.

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: I7005724222289ba967e89af0ce8b9ef8f90a4ae4
Reviewed-on: https://chromium-review.googlesource.com/239967
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Tested-by: Myles Watson <mylesgw@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2015-01-14 03:16:18 +00:00
Ian Chao
4ee50837a0 nuc: Add all IC specific drivers of NPCX5M5G
Add npcx_evb in board folder for testing
Add shared-spi arch support in common layer.

Modified drivers for
1. Fan.c: console command “pwmduty”.
2. Pwm.c: for the issue when set duty to 0.
3. System.c: for hw reset only during system reset.
4. Flash.c: Fixed access denied bug of the flash driver for host command.
5. Comments from Patch Set 1
6. Comments from Patch Set 3 (except sha256.c)
7. Add openocd and flash_ec support for npcx_evb
8. Add little FW and spi-flash upload FW in chip folder
9. Add optional make rules for PROJECT_EXTRA
10.Replace CONFIG_SHRSPI_ARCH with CONFIG_CODERAM_ARCH and remove changes
   in common layer sources for shared-spi arch. (except sysjump)
11.Find the root cause of JTAG issue and use workaround method
   with SUPPORT_JTAG in clock.c
12 Execute hibernate in low power RAM for better power consumption
13 Add workaround method for version console command
14 Modified coding style issues by checkpatch.pl tool

BUG=chrome-os-partner:34346
TEST=make buildall -j; test nuvoton IC specific drivers
BRANCH=none

Change-Id: I5e383420642de1643e2bead837a55c8c58481786
Signed-off-by: Ian Chao <mlchao@nuvoton.com>
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/233742
2015-01-14 03:16:10 +00:00
Vincent Palatin
3951165fe9 hoho/dingdong: support unprotected RO partition
If the RO firmware has a different view of the protection than
the RW copy, we should not change the option bytes (write protection
settings) in RW else we will trigger a reboot loop : RW protects and reset,
then RO unprotects, resets and jump to RW, RW protects and reset again ...

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=chrome-os-partner:35383
TEST=craft a firmware image whose RO partition doesn't include commit
42d0104 (no virtual WP, no RDP set) and RW partition has everything
including this patch, see that HoHo no longer reboots in a loop.

Change-Id: I4cbdbf25a96cb6fb7cbabc7f2d1dc76d3a2a9e36
Reviewed-on: https://chromium-review.googlesource.com/240561
Reviewed-by: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
2015-01-14 03:16:02 +00:00
Vic Yang
2dc01cea42 stm32f: Fix adc_read_all_channels()
We need to clear DMA status before starting another transaction.
Otherwise, we get incorrect values.

BRANCH=Ryu
BUG=chrome-os-partner:33971
TEST=Repeatedly run 'adc' on Ryu.

Change-Id: Iadec58bda142c8224536c4d1e7725aaf57e8a77c
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/240282
Tested-by: Vic Yang <victoryang@chromium.org>
Trybot-Ready: Vic Yang <victoryang@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
2015-01-13 18:48:24 +00:00
Alec Berg
49d2682b72 samus: pd: fix potential junk at end of tx transmission
Fix potential junk at end of PD TX transmit by adding to the DMA
transmit complete interrupt a blocking wait for SPI to finish and
then immediately disable SPI clock. This means we block in an
interrupt function for approximately 45us at the end of every
transmit. But, this is the highest priority thing going on anyway.

Note, there is still a potential for junk if both ports are
transmitting at the same time and finish very close to the same time.

BUG=chrome-os-partner:34600
BRANCH=samus
TEST=load onto samus and test communications with zinger. tested
specifically with an old zinger CL,
https://chromium-review.googlesource.com/#/c/226118/11,
which watchdogs when samus has junk at end of transmit. Tested
without this CL and verified we could never successfully flash zinger
over PD due to this watchdog and verified on scope presence of junk.
Then tested with this change and was able to successfully flash
zinger using ectool on both ports in both polarities.

Change-Id: If0cd9ab0551d36a7d7dc10232b6476dd56735972
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/239244
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
2015-01-09 05:40:18 +00:00
Vincent Palatin
49bfe43b90 usb: fix sysjump
Ensure that we can re-etablish a proper USB communication after a
sysjump by properly disabling the USB stack before jumping.
So the host sees a USB disconnection and can properly re-initialize the
device when it re-appears.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=none
TEST=On Twinkie, use the "sysjump RW" command on the USB console
and see the prompt coming back after a few seconds.

Change-Id: Iaf4498333eb4e7a1dda0f51ee8be19a0c9f10349
Reviewed-on: https://chromium-review.googlesource.com/239227
Reviewed-by: Anton Staaf <robotboy@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
2015-01-08 23:55:53 +00:00
Vincent Palatin
61d50195e1 disable DMA before sysjumping
It's not safe to sysjump with a DMA enabled as it can led to memory
corruption after we have landed in the new image before that piece of
hardware is re-configured.

Implement and call dma_disable_all() on all platforms with generic DMA.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=all
BUG=chrome-os-partner:34865
TEST=on various boards, call "sysjump rw".

Change-Id: I2a6b63ff19c2d932a5e31bc375bf468bc8ae5125
Reviewed-on: https://chromium-review.googlesource.com/237340
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
2015-01-08 22:36:31 +00:00
Vincent Palatin
cca794d2fe pd: dingdong/hoho: Enable flash write-protection
These USB type-C accessories don't have a write-protect GPIO.
Add a configure flag (CONFIG_WP_ALWAYS) to force the flash
write-protection on the dongles.

Also set the read protection (by elevating RDP to level 1),
so trying to unprotect the flash will trigger a full erase.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=chrome-os-partner:35088
TEST=boot Hoho,
check the flash OBR and WRPR registers:
"rw 0x4002201c" / "rw 0x40022020"
and the option bytes write-protect bits: "rw 0x1FFFF808"
dump the logical state with "flashinfo" command.
> rw 0x4002201c
read 0x40022020 = 0xffff0002
> rw 0x40022020
read 0x40022020 = 0xffff0000
> rw 0x1FFFF808
read 0x1ffff808 = 0xff00ff00
> flashinfo
Physical: 128 KB
Usable:   128 KB
Write:      2 B (ideal 2 B)
Erase:   2048 B (to 1-bits)
Protect: 4096 B
Flags:   wp_gpio_asserted ro_at_boot ro_now
Protected now:
    YYYYYYYY YYYYYYYY ........ ........

Change-Id: I45bbc0bce40ecc174b6b8a1ebacf4f53d2fd372d
Reviewed-on: https://chromium-review.googlesource.com/238893
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>
2015-01-08 00:38:17 +00:00
Anton Staaf
18d3bde7f8 USB: Add memcpy_from_usbram and update existing memcpy
Previously there was just a memcpy_usbram that copied to
USB packet memory, and no routine to copy out.  This adds
the "from" version and renames and improves to "to" version.

The improvement is that the new "to" version correctly
handles unaligned beginning and endings of the region to
be copied.  These need to be read/modify/write accesses since
the USB packet ram has to be manipulated in 16-bit chunks.

Signed-off-by: Anton Staaf <robotboy@chromium.org>

BRANCH=None
BUG=None
TEST=make buildall -j
     Verify that discovery-stm32f072 still enumerates and communicates
     correctly over USB.

Change-Id: I94353e66ad0248d4e674abb29f9a88e979767655
Reviewed-on: https://chromium-review.googlesource.com/238764
Tested-by: Anton Staaf <robotboy@chromium.org>
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Anton Staaf <robotboy@chromium.org>
Trybot-Ready: Anton Staaf <robotboy@chromium.org>
2015-01-08 00:38:09 +00:00
Shawn Nematbakhsh
5062e5a171 lm4: Increase time to wake up from deep sleep
The recent change to decrease the time to wake up from deep sleep when
not using LFIOSC was too agressive. Increase the time to wake up based
upon the worst observed case.

BUG=chrome-os-partner:35184
TEST=Manual on Samus. Go to deep sleep, verify that no "overslept by
Xus" prints are seen.
BRANCH=Samus

Change-Id: Ib9fe2eba5e29a112e03fffaedbc5ae53d6d650ff
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/239242
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Alec Berg <alecaberg@chromium.org>
Tested-by: Alec Berg <alecaberg@chromium.org>
2015-01-08 00:38:05 +00:00
Anton Staaf
b1f0a4ca4e USB: Delete mass storage driver
This was an attempt at providing support for flashing a
SPI flash device over USB, but it suffered from being
rather complex and large.  A simpler solution of bridging
SPI over USB directly and writing a SPI over USB driver
for flashrom is being used instead.

Signed-off-by: Anton Staaf <robotboy@chromium.org>

BRANCH=None
BUG=None
TEST=make buildall -j

Change-Id: I0d1ef8f17f5d6a4de46003096a8bff4a33b41cb7
Reviewed-on: https://chromium-review.googlesource.com/238763
Tested-by: Anton Staaf <robotboy@chromium.org>
Reviewed-by: David Schneider <dnschneid@chromium.org>
Reviewed-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Anton Staaf <robotboy@chromium.org>
Trybot-Ready: Anton Staaf <robotboy@chromium.org>
2015-01-08 00:37:46 +00:00
Vic Yang
0825fdf352 Read ADC channels one by one for STM32F
Currently, we are seeing problem with adc_read_all_channels() for
STM32F, and thus 'adc' console command reports incorrect values. Before
that's fixed, read ADC channels one by one to work around this problem.

BRANCH=Ryu
BUG=chrome-os-partner:33971
TEST='adc' on Ryu

Signed-off-by: Vic Yang <victoryang@chromium.org>
Change-Id: Iae92b82b24f6a843b9d46a8804da1e51d33ed7cb
Reviewed-on: https://chromium-review.googlesource.com/231125
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
2015-01-07 23:26:12 +00:00
Alec Berg
23fa3236ae lm4: decrease time to wake up from deep sleep to save power
Decrease the time to wake up from deep sleep when not using
LFIOSC (when using PIOSC in deep sleep). This helps keep us
in deep sleep longer and therefore save power.

BUG=none
BRANCH=samus
TEST=Load onto samus and run for a couple of hours, varying from
S0 to S5, with and without EC. Use idlestats to check that closest
we get to missing deadline is 86us away.

Change-Id: I3eee908e9f42a1c5b549e93d63588a3cb6e29a5d
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/238412
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2015-01-06 01:18:53 +00:00
Vincent Palatin
9ce66a98b2 zinger: enable RO partition write-protection
Check the flash protection at startup, if the RDP is still at level 0
(no read protection) or if the RO partition is not write protected :
- set the write protection on the first 16KB of flash (4 LSB of WRP0)
- push the RDP to level 1, so SWD/serial monitor needs to fully erase
  the part before re-writing the code or the write-protection.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=samus
BUG=chrome-os-partner:34935
TEST=dump the content of the option bytes.

Change-Id: I11af64365a6fbc34327b2e463eb8e2d369ffacd2
Reviewed-on: https://chromium-review.googlesource.com/238262
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
2015-01-05 19:10:27 +00:00
Vincent Palatin
05b0b9774a usb: fix undefined USB endpoints (bis)
Repeat the fix done by the CL
https://chromium-review.googlesource.com/226093 as the new function
iface_undefined introduced by
https://chromium-review.googlesource.com/232368 removed it for the
ep_undefined function.

When calling the ep_undefined function, the linker was not considering
it as a Thumb function and not setting the LSB in the address pointer.
This was causing an exception at runtime.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=all
BUG=none
TEST=inspect assembly
build/load the firmware on Twinkie and see we are no longer panicing at
startup on the unused endpoint 2.

Change-Id: Id97ce43dd699436da7eb32bbe27501a74f0ab932
Reviewed-on: https://chromium-review.googlesource.com/237220
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Trybot-Ready: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Anton Staaf <robotboy@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
2015-01-05 19:10:22 +00:00
Myles Watson
a8ccffded0 nrf51: Add nRF51-specific code to keyboard_raw.c
Use the PORT event for keyboard inputs.
Make a column mask for driving all outputs at once.

BUG=chrome-os-partner:34477
BRANCH=none
TEST=Used hadoken and the Ryu base keyboard to check that the keys are all
functional, that the keyboard polls while keys are held, and that it waits
for interrupts when the keys are released.

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: Ie1dd1ca17b21ed76b2d412bf25fe87e45c5ba757
Reviewed-on: https://chromium-review.googlesource.com/234394
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Myles Watson <mylesgw@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
2014-12-31 00:01:41 +00:00
Myles Watson
ce9a8a2dad nrf51: Copy the keyboard_raw.c implementation from stm32.
BUG=chrome-os-partner:34477
BRANCH=none
TEST=make buildall -j

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: I2ad095a499e960e4b2929792708a563e5b1e1922
Reviewed-on: https://chromium-review.googlesource.com/234393
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Myles Watson <mylesgw@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
2014-12-31 00:01:36 +00:00
Myles Watson
215399af25 nrf51: Add support for the interrupts in GPIOTE to gpio.c
Add structures to keep track of which interrupts are associated with which pin.
There are IN[] events, and one PORT event.  The IN[] events have an array.

The PORT event can be used for multiple pins at once.

BUG=chrome-os-partner:34477
BRANCH=none
TEST=Configured pins as IN[] events and PORT events, and saw console output.

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: I129a6586dca4d5eb141c86fd92fbfbb70080bc2a
Reviewed-on: https://chromium-review.googlesource.com/234392
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Myles Watson <mylesgw@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
2014-12-31 00:01:31 +00:00
Myles Watson
741a2d4589 nrf51: Add definitions for GPIOTE, the GPIO Tasks and Events.
Updated to use parameters for GPIOTE_OUT, GPIOTE_IN, and GPIOTE_CONFIG
Updated with NRF51_GPIOTE_IN_COUNT to remove the magic number.

BUG=chrome-os-partner:34477
BRANCH=none
TEST=Configured IN[] events and PORT events and checked that they triggered
events and wrote to the console.

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: I2021ecbee67c39571f277c97082378dce4de024f
Reviewed-on: https://chromium-review.googlesource.com/234289
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Myles Watson <mylesgw@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
2014-12-31 00:01:25 +00:00
Myles Watson
362bc01a17 hadoken: Update I/O configuration.
Add support for alternate functions for nrf51.

Add more register definitions for the nrf51.

Use assertions for conditions that should never happen.

Use BUILD_ASSERT to keep the sources in sync.

Add three more GPIOs to hadoken.
	BQ27621_GPOUT - Configurable output from the fuel gauge.
	LID_PRESENT_L - The input for the hall sensor.
	IND_CHRG_DISABLE - The output to control inductive charging.

BUG=chrome-os-partner:34477
BRANCH=none
TEST=Used gpioget and magnets for LID_PRESENT_L
Used fuel gauge console commands to trigger BQ27621_GPOUT
Tested the assertions with gdb

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: I508f79ae45127104fa14f9f75fbf545f226387e4
Reviewed-on: https://chromium-review.googlesource.com/234286
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Myles Watson <mylesgw@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
2014-12-31 00:01:06 +00:00
Myles Watson
f326cef49f nrf51: Add support for i2c.
BUG=chrome-os-partner:34477
BRANCH=none
TEST=Custom console commands, I2C console commands
I also used a Logic16 from Saleae and the fuel gauge on hadoken.

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: Ice01aa2ec82621107fa2fd246ce62ddf14d5b9cc
Reviewed-on: https://chromium-review.googlesource.com/234284
Tested-by: Myles Watson <mylesgw@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
2014-12-31 00:00:50 +00:00
Shawn Nematbakhsh
6c41c65536 samus: Debounce BC1.2 charger detection due to asynchronous pin contact
With the type-c connector, it's common for VBUS to make contact before
D+/D-, which can lead to charger misdetection. To work around this, add
a 200ms delay and trigger re-detection when a charger is inserted. This
should fix most misdetects due to unintentional slow plug (though it's
still possible to misdetect if insertion is deliberately very slow).

BUG=chrome-os-partner:34584
TEST=Manual on Samus. Plug in Apple charger 20 times, verify that it is
always detected correctly. Deliberately plug in slowly, verify it is
detected as 500mA SDP port. Repeat tests with various other CDP / SDP
ports to verify detection never over-currents and always indicates a
charger is plugged (or not plugged) correctly.
BRANCH=Samus

Change-Id: I8a776f516d8e7f0cedcb9d8579239eba641cab09
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/237241
Reviewed-by: Alec Berg <alecaberg@chromium.org>
2014-12-29 22:27:42 +00:00
Kevin K Wong
850ef52982 mec1322: Added support to use crystal vs oscillator based on board's clock circuitry.
BUG=None
TEST=make -j buildall
BRANCH=None

Change-Id: I88fa219cd9e573c1544400d24d00c4fdec93840f
Signed-off-by: Kevin K Wong <kevin.k.wong@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/237272
Reviewed-by: Vic Yang <victoryang@chromium.org>
2014-12-29 19:04:38 +00:00
Dino Li
4d9dfa159b it8380dev: add ec2i control module
Add EC2I control module for emulation board.
The EC2I bridge enables the EC to access the host controlled
module registers (e.g., host configuration module(PNPCFG) and SWUC)

Signed-off-by: Dino Li <dino.li@ite.com.tw>

BRANCH=none
BUG=none
TEST=EC2I read: Read a logical device page, the results are correctly.
     EC2I write: Initialize PNPCFG success.

Change-Id: I900450d4a8c49182c438b69b5e738c12dc437fe4
Reviewed-on: https://chromium-review.googlesource.com/230410
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Dino Li <dino.li@ite.com.tw>
Tested-by: Dino Li <dino.li@ite.com.tw>
2014-12-23 01:50:25 +00:00
Dino Li
165cf6c881 it8380dev: add adc control module
Add adc control module for emulation board.
The ADC converts the input voltage signal ranging
from 0v to 3v into a 10-bit unsigned integer.

Signed-off-by: Dino Li <dino.li@ite.com.tw>

BRANCH=none
BUG=none
TEST=manual test.
1 - adc channel 1, 3, 5, and 7 to ground.
2 - adc channel 0 and 2 to 1.26v.
3 - adc channel 4 and 6 to 1.72v.
4 - condition, factor_mul = 3000, factor_div = 1024, and shift = 0.
5 - console "adc", result as following.
adc_ch0 = 1256
adc_ch1 = 0
adc_ch2 = 1256
adc_ch3 = 0
adc_ch4 = 1722
adc_ch5 = 0
adc_ch6 = 1725
adc_ch7 = 0

Change-Id: I72efd09c9f7dbff25c4f6fd4846c9b1c1e5637ca
Reviewed-on: https://chromium-review.googlesource.com/228092
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Dino Li <dino.li@ite.com.tw>
Tested-by: Dino Li <dino.li@ite.com.tw>
2014-12-19 09:17:27 +00:00
Myles Watson
7ec2e4158a There is a constant 16 MHz clock signal.
BUG=chrome-os-partner:34477
BRANCH=none
TEST=make buildall -j

Signed-off-by: Myles Watson <mylesgw@chromium.org>

Change-Id: I62bb9aeb5ee4eaee893f389628144f88042132ed
Reviewed-on: https://chromium-review.googlesource.com/234391
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Myles Watson <mylesgw@chromium.org>
Tested-by: Myles Watson <mylesgw@chromium.org>
2014-12-19 03:55:54 +00:00
Chris Zhong
48b2edf031 stm32f0/i2c: adjust the 100kHz setting to never go above 100kHz
STM32 seems to actually measure the rising and falling time of the I2C clock, so
if one uses a really small resistor the timing will go faster than with a bigger
resistor.

This commit makes it so the I2C frequency is limited to max 100kHz (respecting
the spec) no matter what size resistor (essentially we assume 0 rise and fall
times). While this will make stuff slower on boards with big resistors (where
they might have been under 100kHz anyway) this is the best compromise (since the
spec does not specify min frequency) without getting config defines for the
fall/rise times.

The TSCLH of some boards would be too short with the recommended timing
settings from spec, so increases the TSCLH would be better for everyone.

This patch does not touch the higher frequencies since the rise and fall times
do contribute a lot more to clocks, if the same method was used for those
frequencies, the speeds would have to be a lot slower.

BUG=chrome-os-partner:34375
BRANCH=None
TEST=on any EC, note how frequency does not go above 100kHz
TEST=As per tSCL = tSYNC1 + tSYNC2 + { [(SCLH+1) + (SCLL+1)] x
      (PRESC+1) x tI2CCLK } from datasheet

Change-Id: Ibbeecac7f3da1b22d2ba3bca29ee3c17bfe997f5
Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Signed-off-by: Alexandru M Stan <amstan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/234077
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2014-12-18 21:41:01 +00:00