mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2026-01-11 02:15:14 +00:00
4aa491359c
To reduce the amount of time spent polling to see if the i2c bus has completed its transfer, I'm converting it over to interrupts. Before starting a dma transfer, the i2c code now enables dma interrupts with an ISR that will just wake up the i2c task when the transfer is complete. This leaves the cpu free while the dma is handling all the i2c work. The slave-receiver didn't require any updates as it is already interrupt driven, via the i2c events. The other three cases: master-receiver, master-transmitter, and slave-transmitter, have all been converted over to use the dma interrupts. With these changes, the cpu should spend very little time waiting for i2c transfers to complete. BUG=chrome-os-partner:12405 TEST=To test the master modes, from the EC console run "battery" and "pmu." If those work, then master mode is functioning. For slave modes, power on the machine and monitor the cpu console for errors. When it's on, try typing and confirm there are no errors there either. Change-Id: I1ca020911b7be6762389ca2b858b2b973f8754bc Signed-off-by: Charlie Mooney <charliemooney@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/30229 Reviewed-by: David Hendricks <dhendrix@chromium.org>
- EC Lib
This wraps Blizzard driverlib and implements the EC chip interface defined
by Google. See below diagram for architecture.
+--------------------+
| Host BIOS/OS |
+--------------------+
---- host interface ----
+--------------------+
| Google EC features |
+--------------------+
---- chip interface ---- The interface is defined in
src/platform/ec/chip_interface/*.
+--------------------+ But the real implementation is in EC Lib.
| EC Lib |
+--------------------+
| Blizzard low level |
| driver, the |
| driverlib. |
+--------------------+
Build Options
=============
- CONFIG_WATCHDOG_HELP
Try to detect a watchdog that is about to fire, and print a trace.
This is needed on STM32, where the independent watchdog has no early
warning feature and the windowed watchdog has a very short period.
- CONFIG_PANIC_NEW_STACK
When reporting a panic, change to a completely new stack. This might
help get a useful trace out a situation where the stack or stack
pointer has been corrupted.
- CONFIG_PANIC_HELP
Report extra information about a panic, such as the fault address,
here shown as bfar. This shows the reason for the fault and may help
to determine the cause.
=== EXCEPTION: 03 ====== xPSR: 01000000 ===========
r0 :0000000b r1 :00000047 r2 :60000000 r3 :200013dd
r4 :00000000 r5 :080053f4 r6 :200013d0 r7 :00000002
r8 :00000000 r9 :200013de r10:00000000 r11:00000000
r12:00000000 sp :200009a0 lr :08002b85 pc :08003a8a
Precise data bus error, Forced hard fault, Vector catch, bfar = 60000000
mmfs = 00008200, shcsr = 00000000, hfsr = 40000000, dfsr = 00000008
- CONFIG_ASSERT_HELP
Report assertion failures in a vebose manner to aid debugging. When
enabled an ASSERT() which fails will produce message in the form:
ASSERTION FAILURE '<expr>' in function() at file:line