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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>
48 lines
771 B
ArmAsm
48 lines
771 B
ArmAsm
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <sbi/riscv_asm.h>
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#include "fdt_reset_thead.h"
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/*
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* csrrs rd, csr, rs1
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* |31 20|19 15|14 12|11 7|6 0|
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* csr rs1 010 rd 1110011
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*/
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#define CSR_STUB addi x0, x0, 0
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.option norvc
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.align 3
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.global __fdt_reset_thead_csrr
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__fdt_reset_thead_csrr:
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csrrs a0, 0, x0
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ret
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.align 3
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.global __thead_pre_start_warm
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__thead_pre_start_warm:
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/*
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* Clear L1 cache & BTB & BHT ...
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*/
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li t1, 0x70013
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csrw 0x7c2, t1
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fence rw,rw
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lla t1, custom_csr
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.global __reset_thead_csr_stub
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__reset_thead_csr_stub:
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.rept MAX_CUSTOM_CSR
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REG_L t2, 8(t1)
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CSR_STUB
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addi t1, t1, 16
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.endr
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/*
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* Clear L1 cache & BTB & BHT ...
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*/
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li t1, 0x70013
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csrw 0x7c2, t1
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fence rw,rw
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j _start_warm
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