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lib: utils: reset: Add T-HEAD sample platform reset driver

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This driver is for T-HEAD test chip, fpga. It could work with
all T-HEAD riscv processors: C9xx series.

example1: (Using io-regs for reset)
reset: reset-sample {
	compatible = "thead,reset-sample";
	plic-delegate = <0xff 0xd81ffffc>;
	entry-reg = <0xff 0xff019050>;
	entry-cnt = <4>;
	control-reg = <0xff 0xff015004>;
	control-val = <0x1c>;
	csr-copy = <0x7f3 0x7c0 0x7c1 0x7c2 0x7c3 0x7c5 0x7cc>;
};

example2: (Using csr-regs for reset)
reset: reset-sample {
	compatible = "thead,reset-sample";
	plic-delegate = <0xff 0xd81ffffc>;
	using-csr-reset;
	csr-copy = <0x7c0 0x7c1 0x7c2 0x7c3 0x7c5 0x7cc
		    0x3b0 0x3b1 0x3b2 0x3b3
		    0x3b4 0x3b5 0x3b6 0x3b7
		    0x3a0>;
};

example3: (Only delegate plic enable to S-mode)
reset: reset-sample {
	compatible = "thead,reset-sample";
	plic-delegate = <0xff 0xd81ffffc>;
};

After this patch, all T-HEAD c9xx would use platform/generic with fw_dynamic
as default:

CROSS_COMPILE=riscv64-linux-gnu- PLATFORM=generic FW_PIC=y /usr/bin/make

The platform/thead will be deprecated.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Guo Ren
2021-04-17 16:26:17 +00:00
committed by Anup Patel
parent c5d0645052
commit 49e422c5ad
7 changed files with 214 additions and 0 deletions
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2
lib/utils/reset/objects.mk
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@@ -10,3 +10,5 @@
libsbiutils-objs-y += reset/fdt_reset.o
libsbiutils-objs-y += reset/fdt_reset_htif.o
libsbiutils-objs-y += reset/fdt_reset_sifive.o
libsbiutils-objs-y += reset/fdt_reset_thead.o
libsbiutils-objs-y += reset/fdt_reset_thead_asm.o