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5 Commits

Author SHA1 Message Date
Jiaxun Yang
162e134aed MIPS: Loongson64: Remove CPU_HAS_WB 
Q: Do we have really have write buffer
A: Yes, on newer Loongson processors there is a "store fill buffer"
   that will collect *cached* writes, on all Loongson processors
   AXI crossbar will buffer all writes.

Q: Then why do we want to remove CPU_HAS_WB?
A: Because CPU_HAS_WB introduces wbflush, which intends to flush
   all write reuqests to mmio device. We won't be affected by store
   fill buffer because it won't buffer uncached writes. And a regular
   memory barrier is sufficient to flush crossbar write buffer.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 2023-03-14 17:06:16 +01:00
Tiezhu Yang
cd04d58e82 MIPS: Remove redundant definitions of device_tree_init() 
There exists many same definitions of device_tree_init() for various
platforms, add a weak function in arch/mips/kernel/prom.c to clean
up the related code.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 2022-03-14 15:09:02 +01:00
Tiezhu Yang
89fa126893 MIPS: Remove redundant check in device_tree_init() 
In device_tree_init(), unflatten_and_copy_device_tree() checks
initial_boot_params, so remove the redundant check.

drivers/of/fdt.c
void __init unflatten_and_copy_device_tree(void)
{
	int size;
	void *dt;

	if (!initial_boot_params) {
		pr_warn("No valid device tree found, continuing without\n");
		return;
	}
	...
}

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 2022-03-14 15:07:49 +01:00
Jiaxun Yang
fcecdcd388 MIPS: Loongson64: Load built-in dtbs 
Load proper dtb according to firmware passed parameters and
CPU PRID.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Co-developed-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 2020-03-25 16:07:12 +01:00
Jiaxun Yang
6fbde6b492
MIPS: Loongson64: Move files to the top-level directory 
Current Loongson-3 code can share among all Loongson64 processors.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: chenhc@lemote.com
Cc: paul.burton@mips.com
 2019-11-01 14:31:28 -07:00