include/asm/yamon-dt.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Copyright (C) 2016 Imagination Technologies
0004  * Author: Paul Burton <paul.burton@mips.com>
0005  */
0006
0007 #ifndef __MIPS_ASM_YAMON_DT_H__
0008 #define __MIPS_ASM_YAMON_DT_H__
0009
0010 #include <linux/types.h>
0011
0012 /**
0013  * struct yamon_mem_region - Represents a contiguous range of physical RAM.
0014  * @start:  Start physical address.
0015  * @size:   Maximum size of region.
0016  * @discard:    Length of additional memory to discard after the region.
0017  */
0018 struct yamon_mem_region {
0019     phys_addr_t start;
0020     phys_addr_t size;
0021     phys_addr_t discard;
0022 };
0023
0024 /**
0025  * yamon_dt_append_cmdline() - Append YAMON-provided command line to /chosen
0026  * @fdt: the FDT blob
0027  *
0028  * Write the YAMON-provided command line to the bootargs property of the
0029  * /chosen node in @fdt.
0030  *
0031  * Return: 0 on success, else -errno
0032  */
0033 extern __init int yamon_dt_append_cmdline(void *fdt);
0034
0035 /**
0036  * yamon_dt_append_memory() - Append YAMON-provided memory info to /memory
0037  * @fdt:    the FDT blob
0038  * @regions:    zero size terminated array of physical memory regions
0039  *
0040  * Generate a /memory node in @fdt based upon memory size information provided
0041  * by YAMON in its environment and the @regions array.
0042  *
0043  * Return: 0 on success, else -errno
0044  */
0045 extern __init int yamon_dt_append_memory(void *fdt,
0046                     const struct yamon_mem_region *regions);
0047
0048 /**
0049  * yamon_dt_serial_config() - Append YAMON-provided serial config to /chosen
0050  * @fdt: the FDT blob
0051  *
0052  * Generate a stdout-path property in the /chosen node of @fdt, based upon
0053  * information provided in the YAMON environment about the UART configuration
0054  * of the system.
0055  *
0056  * Return: 0 on success, else -errno
0057  */
0058 extern __init int yamon_dt_serial_config(void *fdt);
0059
0060 #endif /* __MIPS_ASM_YAMON_DT_H__ */