fc2c106caa
This adds a ramstage driver for the TPM and allows the interrupt to be configured in devicetree.cb. The interrupt vector is set like other PNP devices, and the interrupt polarity is set with a register configuration variable. These values are written into locality 0 TPM_INT_VECTOR and TPM_INT_ENABLE and then all interrupts are disabled so they are not used in firmware but can be enabled by the OS. It also adds an ACPI device for the TPM which will configure the reported interrupt based on what has been written into the TPM during ramstage. The _STA method returns enabled if CONFIG_LPC_TPM is enabled, and the _CRS method will only report an interrupt if one has been set in the TPM itself. The TPM memory address is added by the driver and declared in the ACPI code. In order to access it in ACPI a Kconfig entry is added for the default TPM TIS 1.2 base address. Note that IO address 0x2e is required to be declared in ACPI for the kernel driver to probe correctly. BUG=chrome-os-partner:33385 BRANCH=samus,auron TEST=manual testing on samus: 1) Add TPM device in devicetree.cb with configured interrupt and ensure that it is functional in the OS. 2) Test with active high and active low, edge triggered and level triggered setups. 3) Ensure that with no device added to devicetree.cb that the TPM is still functional in polling mode. Change-Id: Id8a5a251f193c71ab2209f85fb470120a3b6a80d Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/226661 Reviewed-by: Aaron Durbin <adurbin@chromium.org> |
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| .. | ||
| tpm | ||
| vga | ||
| i8254.c | ||
| i8259.c | ||
| isa-dma.c | ||
| Kconfig | ||
| keyboard.c | ||
| Makefile.inc | ||
| mc146818.c | ||
| mc146818rtc.c | ||
| mc146818rtc_early.c | ||
| udelay_io.c | ||