MIPS: loongson2ef: don't build serial.o unconditionally

LOONGSON_UART_BASE depends on EARLY_PRINTK || SERIAL_8250, but when
neither of these Kconfig symbols is set, the kernel build has errors:

../

MIPS: loongson2ef: don't build serial.o unconditionally

LOONGSON_UART_BASE depends on EARLY_PRINTK || SERIAL_8250, but when
neither of these Kconfig symbols is set, the kernel build has errors:

../arch/mips/loongson2ef/common/serial.c: In function 'serial_init':
../arch/mips/loongson2ef/common/serial.c:66:25: error: 'loongson_uart_base' undeclared (first use in this function)
66 | loongson_uart_base;
../arch/mips/loongson2ef/common/serial.c:66:25: note: each undeclared identifier is reported only once for each function it appears in
../arch/mips/loongson2ef/common/serial.c:68:41: error: '_loongson_uart_base' undeclared (first use in this function)
68 | (void __iomem *)_loongson_uart_base;

Fix this by building serial.o only when one (or both) of these
Kconfig symbols is enabled.

Tested with:
(a) EARLY_PRINTK=y, SERIAL_8250 not set;
(b) EARLY_PRINTK=y, SERIAL_8250=y;
(c) EARLY_PRINTK=y, SERIAL_8250=m.
(d) EARLY_PRINTK not set, SERIAL_8250=y;
(e) EARLY_PRINTK not set, SERIAL_8250=m;
(f) EARLY_PRINTK not set, SERIAL_8250 not set.

Signed-off-by: Randy Dunlap <[email protected]>
Reported-by: kernel test robot <[email protected]>
Cc: Jiaxun Yang <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: [email protected]
Signed-off-by: Thomas Bogendoerfer <[email protected]>

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MIPS: Loongson2ef: Convert to early_printk_8250

early_printk.c is doing the same with early_printk_8250.
Remove duplicated code.

Signed-off-by: Jiaxun Yang <[email protected]>
Signed-off-by:

MIPS: Loongson2ef: Convert to early_printk_8250

early_printk.c is doing the same with early_printk_8250.
Remove duplicated code.

Signed-off-by: Jiaxun Yang <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: [email protected]

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MIPS: Loongson{2ef, 32, 64} convert to generic fw cmdline

All of Loongson firmwares are passing boot cmdline/env
in the manner of YAMON/PMON. Thus we can remove duplicated
cmdline initialize code an

MIPS: Loongson{2ef, 32, 64} convert to generic fw cmdline

All of Loongson firmwares are passing boot cmdline/env
in the manner of YAMON/PMON. Thus we can remove duplicated
cmdline initialize code and convert to generic fw method.

Signed-off-by: Jiaxun Yang <[email protected]>
Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: [email protected]

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MIPS: Fork loongson2ef from loongson64

As later model of GSx64 family processors including 2-series-soc have
similar design with initial loongson3a while loongson2e/f seems less
identical, we separa

MIPS: Fork loongson2ef from loongson64

As later model of GSx64 family processors including 2-series-soc have
similar design with initial loongson3a while loongson2e/f seems less
identical, we separate loongson2e/f support code out of mach-loongson64
to make our life easier.

This patch contains mostly file moving works.

Signed-off-by: Jiaxun Yang <[email protected]>
[[email protected]: Squash in the MAINTAINERS updates]
Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: [email protected]

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