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platform: Add generic FDT based platform support

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We add generic FDT based platform support which provides platform
specific functionality based on the FDT passed by previous booting
stage.

By default, the generic FDT platform makes following assumptions:
1. platform FW_TEXT_START is 0x80000000
2. platform features are default
3. platform stack size is default
4. platform has no quirks or work-arounds

The above assumptions (except 1) can be overridden by adding special
platform callbacks which will be called based on the FDT root node
compatible string.

By default, we compile OpenSBI generic platform as follows:
$ make PLATFORM=generic

For a non-standard FW_TEXT_START, we can compile OpenSBI generic
platform as follows:
$ make PLATFORM=generic FW_TEXT_START=<non_standard_text_start>

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-04-28 09:23:30 +05:30
committed by Anup Patel
parent 4d063538f0
commit f1aa9e54e0
6 changed files with 333 additions and 0 deletions
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26
platform/generic/include/platform_override.h Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#ifndef __PLATFORM_OVERRIDE_H__
#define __PLATFORM_OVERRIDE_H__
#include <sbi/sbi_types.h>
struct platform_override {
const struct fdt_match *match_table;
u64 (*features)(const struct fdt_match *match);
u64 (*tlbr_flush_limit)(const struct fdt_match *match);
int (*early_init)(bool cold_boot, const struct fdt_match *match);
int (*final_init)(bool cold_boot, const struct fdt_match *match);
void (*early_exit)(const struct fdt_match *match);
void (*final_exit)(const struct fdt_match *match);
int (*system_reset)(u32 reset_type, const struct fdt_match *match);
};
#endif