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Commit 3a551e25 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

MIPS: Malta: initialise MAARs 



Initialise the MAARs such that speculation is enabled for all physical
addresses outside of the I/O region.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7333/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent ab9988a3

arch/mips/mti-malta/malta-memory.c

+26 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/string.h>



#include <asm/bootinfo.h>

#include <asm/maar.h>

#include <asm/sections.h>

#include <asm/fw/fw.h>
@@ -164,3 +165,28 @@ void __init prom_free_prom_memory(void) 
				addr, addr + boot_mem_map.map[i].size);

	}

}



unsigned platform_maar_init(unsigned num_pairs)

{

	phys_addr_t mem_end = (physical_memsize & ~0xffffull) - 1;

	struct maar_config cfg[] = {

		/* DRAM preceding I/O */

		{ 0x00000000, 0x0fffffff, MIPS_MAAR_S },



		/* DRAM following I/O */

		{ 0x20000000, mem_end, MIPS_MAAR_S },



		/* DRAM alias in upper half of physical */

		{ 0x80000000, 0x80000000 + mem_end, MIPS_MAAR_S },

	};

	unsigned i, num_cfg = ARRAY_SIZE(cfg);



	/* If DRAM fits before I/O, drop the region following it */

	if (physical_memsize <= 0x10000000) {

		num_cfg--;

		for (i = 1; i < num_cfg; i++)

			cfg[i] = cfg[i + 1];

	}



	return maar_config(cfg, num_cfg, num_pairs);

}