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Loongson family machines has three types of serial port: PCI UART, LPC UART and CPU internal UART. Loongson-2E and parts of Loongson-2F based machines use PCI UART; most Loongson-2F based machines use LPC UART; Loongson-2G/3A has both LPC and CPU UART but usually use CPU UART. Port address of UARTs: CPU UART: REG_BASE + OFFSET; LPC UART: LIO1_BASE + OFFSET; PCI UART: PCIIO_BASE + OFFSET. Since LPC UART are linked in "Local Bus", both CPU UART and LPC UART are called "CPU provided serial port". Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Hongliang Tao <taohl@lemote.com> Signed-off-by: Hua Yan <yanh@lemote.com> Tested-by: Alex Smith <alex.smith@imgtec.com> Reviewed-by: Alex Smith <alex.smith@imgtec.com> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Patchwork: https://patchwork.linux-mips.org/patch/6635 Signed-off-by: Ralf Baechle <ralf@linux-mips.org> |
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