mirror of https://gitee.com/openkylin/linux.git
TTY: Add MIPS EJTAG Fast Debug Channel TTY driver
Add TTY driver and consoles for the MIPS EJTAG Fast Debug Channel (FDC), which is found on the per-CPU MIPS Common Device Mapped Memory (CDMM) bus. The FDC is a per-CPU device which is used to communicate with an EJTAG probe. RX and TX FIFOs exist, containing 32-bits of data and 4-bit channel numbers. 16 general data streams are implemented on this for TTY and console use by encoding up to 4 bytes on each 32-bit FDC word. The TTY devices are named e.g. /dev/ttyFDC3c2 for channel 2 of the FDC attached to logical CPU 3. These can be used for getting the kernel log, a login prompt, or as a GDB remote transport, all over EJTAG and without needing a serial port. It can have an interrupt to notify of when incoming data is available in the RX FIFO or when the TX FIFO is no longer full. The detection of this interrupt occurs in architecture / platform code, but it may be shared with the timer and/or performance counter interrupt. Due to the per-CPU nature of the hardware, all outgoing TTY data is written out from a kthread which is pinned to the appropriate CPU. The console is not bound to a specific CPU, so output will appear on the chosen channel on whichever CPU the code is executing on. Enable with e.g. console=fdc1 in kernel arguments. /dev/console is bound to the same channel on the boot CPU's FDC if it exists. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.cz> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/9146/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -419,4 +419,22 @@ config DA_CONSOLE
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help
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This enables a console on a Dash channel.
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config MIPS_EJTAG_FDC_TTY
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bool "MIPS EJTAG Fast Debug Channel TTY"
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depends on MIPS_CDMM
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help
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This enables a TTY and console on the MIPS EJTAG Fast Debug Channels,
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if they are present. This can be useful when working with an EJTAG
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probe which supports it, to get console output and a login prompt via
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EJTAG without needing to connect a serial cable.
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TTY devices are named e.g. ttyFDC3c2 (for FDC channel 2 of the FDC on
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CPU3).
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The console can be enabled with console=fdc1 (for FDC channel 1 on all
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CPUs). Do not use the console unless there is a debug probe attached
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to drain the FDC TX FIFO.
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If unsure, say N.
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endif # TTY
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@ -29,5 +29,6 @@ obj-$(CONFIG_SYNCLINK) += synclink.o
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obj-$(CONFIG_PPC_EPAPR_HV_BYTECHAN) += ehv_bytechan.o
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obj-$(CONFIG_GOLDFISH_TTY) += goldfish.o
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obj-$(CONFIG_DA_TTY) += metag_da.o
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obj-$(CONFIG_MIPS_EJTAG_FDC_TTY) += mips_ejtag_fdc.o
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obj-y += ipwireless/
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