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3c2c1398ec
When AP is off, turn off pullup on NSS, and set MISO to an input so the SPI module won't drive it high if the last sent bit was a 1. This reduces leakage when the AP is off. This patch also fixes a bug where gpio_set_alternate_function() set the wrong pins to normal-mode when func=-1; that didn't hit anything else because that functionality wasn't used on STM32 until now. BUG=chrome-os-partner:19304 BRANCH=none TEST=boot pit On EC console, with AP on, 'rw 0x40020000' returns read 0x40020000 = 0x6569aa20 <- must have 0x____aa__ Then 'apshutdown' and 'rw 0x40020000' returns read 0x40020000 = 0x65690020 <- must have 0x____00__ The 'power on' and AP turns back on. At u-boot prompt, 'sspi 2:0 256 9f00000000' returns FDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFEEC010001 (some number of 0xFD's followed by FEEC...) This shows SPI functionality is restored when AP is powered back on, and not just at init time. Change-Id: Ia3cd3e0bc222dc663d635509918fa3d383fd7971 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/51182 Reviewed-by: Simon Glass <sjg@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_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
- CONFIG_AC_POWER_STATUS
Monitor the state of the AC power input and drive out a GPIO to
the AP indicating this state. The GPIO will be driven low when
AC power is not connected, and high when it is connected. This
uses GPIO_AC_STATUS for this purpose.
- CONFIG_PMU_FORCE_FET
Force switching on and off the FETs on the PMU controlling various
power rails during AP startup and shutdown sequences.
This is mainly useful for bringup when we don't have the corresponding
sequences in the AP code.
- CONFIG_KEYBOARD_TEST
Turn on keyboard testing functionality. This enables a message which
received a list of keyscan events from the AP and processes them.
This will cause keypresses to appear on the AP through the same
mechanism as a normal keyboard press.