forked from Mirrors/opensbi
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>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/sbi_scratch.h>
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#include <sbi_utils/fdt/fdt_helper.h>
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#include <sbi_utils/reset/fdt_reset.h>
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extern struct fdt_reset fdt_reset_sifive;
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extern struct fdt_reset fdt_reset_htif;
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extern struct fdt_reset fdt_reset_thead;
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static struct fdt_reset *reset_drivers[] = {
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&fdt_reset_sifive,
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&fdt_reset_htif,
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&fdt_reset_thead,
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};
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static struct fdt_reset *current_driver = NULL;
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int fdt_system_reset_check(u32 reset_type, u32 reset_reason)
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{
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if (current_driver && current_driver->system_reset_check)
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return current_driver->system_reset_check(reset_type,
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reset_reason);
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return 0;
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}
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void fdt_system_reset(u32 reset_type, u32 reset_reason)
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{
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if (current_driver && current_driver->system_reset)
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current_driver->system_reset(reset_type, reset_reason);
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}
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int fdt_reset_init(void)
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{
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int pos, noff, rc;
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struct fdt_reset *drv;
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const struct fdt_match *match;
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void *fdt = sbi_scratch_thishart_arg1_ptr();
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for (pos = 0; pos < array_size(reset_drivers); pos++) {
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drv = reset_drivers[pos];
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noff = fdt_find_match(fdt, -1, drv->match_table, &match);
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if (noff < 0)
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continue;
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if (drv->init) {
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rc = drv->init(fdt, noff, match);
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if (rc)
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return rc;
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}
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current_driver = drv;
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break;
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}
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return 0;
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}
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