335b139057
Add a mechanism for early SoC initialization for platforms that need
additional hardware initialization not possible through the regular
device tree and drivers mechanism. With this, a SoC specific
initialization function can be called very early, before DTB parsing
is done by parse_dtb() in Linux RISC-V kernel setup code.
This can be very useful for early hardware initialization for No-MMU
kernels booted directly in M-mode because it is quite likely that no
other booting stage exist prior to the No-MMU kernel.
Example use of a SoC early initialization is as follows:
static void vendor_abc_early_init(const void *fdt)
{
/*
* some early init code here that can use simple matches
* against the flat device tree file.
*/
}
SOC_EARLY_INIT_DECLARE("vendor,abc", abc_early_init);
This early initialization function is executed only if the flat device
tree for the board has a 'compatible = "vendor,abc"' entry;
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
24 lines
591 B
C
24 lines
591 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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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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#ifndef _ASM_RISCV_SOC_H
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#define _ASM_RISCV_SOC_H
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#include <linux/of.h>
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#include <linux/linkage.h>
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#include <linux/types.h>
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#define SOC_EARLY_INIT_DECLARE(name, compat, fn) \
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static const struct of_device_id __soc_early_init__##name \
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__used __section(__soc_early_init_table) \
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= { .compatible = compat, .data = fn }
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void soc_early_init(void);
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extern unsigned long __soc_early_init_table_start;
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extern unsigned long __soc_early_init_table_end;
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#endif
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