This patchset is based on the patchset by Leif Lindholm [1] 'ARM Server Base Boot Requirements' [2] mention SPCR (Serial Port Console Redirection Table) [3] as a mandatory ACPI table that specifies the configuration of serial console. Licensing concerns have prevented implementing it in the past, but as of 10 August 2015, these tables have both been released also under OWF 1.0 [4]. SPCR support is included in QEMU's ARM mach-virt since 2.4 release. Parse the SPCR table and check if any registered console match the description. If it does, enable that console. To implement that, introduce a new member int (*acpi_match)(struct console *, struct acpi_table_spcr *); of struct console. It allows drivers to check if they provide a matching console device. Also add an implementation of this member function to the pl011 driver and fix a minor issue in kernel/printk/printk.c [1] https://lkml.kernel.org/g/1441716217-23786-1-git-send-email-leif.lindholm@xxxxxxxxxx [2] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0044a/index.html [3] https://msdn.microsoft.com/en-us/library/windows/hardware/dn639132(v=vs.85).aspx [4] http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0 Aleksey Makarov (3): printk: make preferred_console local static bool ACPI: parse SPCR and enable matching console serial: pl011: add acpi_match for amba-pl011.c arch/arm64/Kconfig | 1 + drivers/acpi/Kconfig | 3 ++ drivers/acpi/Makefile | 1 + drivers/acpi/spcr.c | 85 +++++++++++++++++++++++++++++++++++++ drivers/tty/serial/amba-pl011.c | 14 ++++++ include/acpi/actbl2.h | 4 ++ include/linux/console.h | 12 ++++++ kernel/printk/printk.c | 94 +++++++++++++++++++++++++++++++---------- 8 files changed, 191 insertions(+), 23 deletions(-) create mode 100644 drivers/acpi/spcr.c -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
