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YAMON can expose more than 256MB of RAM to Linux on Malta by passing an ememsize environment variable with the full size, but the kernel then needs to be careful to choose the corresponding physical memory regions, avoiding the IO memory window. This is platform dependent, and on Malta it also depends on the memory layout which varies between system controllers. Extend yamon_dt_amend_memory() to generically handle this by taking [e]memsize bytes of memory from an array of memory regions passed in as a new parameter. Board code provides this array as appropriate depending on its own memory map. [paul.burton@imgtec.com: SEAD-3 supports 384MB DDR from 0] Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/16182/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/*
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* Copyright (C) 2016 Imagination Technologies
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* Author: Paul Burton <paul.burton@imgtec.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef __MIPS_ASM_YAMON_DT_H__
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#define __MIPS_ASM_YAMON_DT_H__
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#include <linux/types.h>
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/**
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* struct yamon_mem_region - Represents a contiguous range of physical RAM.
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* @start: Start physical address.
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* @size: Maximum size of region.
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* @discard: Length of additional memory to discard after the region.
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*/
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struct yamon_mem_region {
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phys_addr_t start;
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phys_addr_t size;
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phys_addr_t discard;
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};
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/**
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* yamon_dt_append_cmdline() - Append YAMON-provided command line to /chosen
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* @fdt: the FDT blob
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*
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* Write the YAMON-provided command line to the bootargs property of the
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* /chosen node in @fdt.
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*
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* Return: 0 on success, else -errno
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*/
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extern __init int yamon_dt_append_cmdline(void *fdt);
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/**
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* yamon_dt_append_memory() - Append YAMON-provided memory info to /memory
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* @fdt: the FDT blob
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* @regions: zero size terminated array of physical memory regions
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*
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* Generate a /memory node in @fdt based upon memory size information provided
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* by YAMON in its environment and the @regions array.
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*
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* Return: 0 on success, else -errno
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*/
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extern __init int yamon_dt_append_memory(void *fdt,
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const struct yamon_mem_region *regions);
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/**
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* yamon_dt_serial_config() - Append YAMON-provided serial config to /chosen
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* @fdt: the FDT blob
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*
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* Generate a stdout-path property in the /chosen node of @fdt, based upon
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* information provided in the YAMON environment about the UART configuration
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* of the system.
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*
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* Return: 0 on success, else -errno
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*/
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extern __init int yamon_dt_serial_config(void *fdt);
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#endif /* __MIPS_ASM_YAMON_DT_H__ */
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