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https://github.com/riscv-software-src/opensbi.git
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49e422c5ad
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>
24 lines
417 B
C
24 lines
417 B
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#ifndef __FDT_RESET_THEAD_H__
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#define __FDT_RESET_THEAD_H__
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#define MAX_CUSTOM_CSR 32
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#ifndef __ASSEMBLER__
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struct custom_csr {
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unsigned long index;
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unsigned long value;
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};
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u64 __fdt_reset_thead_csrr(void);
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extern struct custom_csr custom_csr[MAX_CUSTOM_CSR];
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extern u32 __reset_thead_csr_stub[];
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#endif /* __ASSEMBLER__ */
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#endif /* __FDT_RESET_THEAD_H__ */
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