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MIPS: sead3: allow cmdline/env to change memory size using memsize param
if the user sets memsize parameter in commandline or bootloader environment, we use it to modify the built-in dtb memory size Signed-off-by: Qais Yousef <qais.yousef@imgtec.com> Reviewed-by: Paul Burton <paul.burton@imgtec.com> Reviewed-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: John Crispin <blogic@openwrt.org> Patchwork: http://patchwork.linux-mips.org/patch/6207/
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@ -344,6 +344,7 @@ config MIPS_SEAD3
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select DMA_NONCOHERENT
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select IRQ_CPU
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select IRQ_GIC
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select LIBFDT
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select MIPS_MSC
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select SYS_HAS_CPU_MIPS32_R1
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select SYS_HAS_CPU_MIPS32_R2
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@ -21,5 +21,7 @@ obj-$(CONFIG_EARLY_PRINTK) += sead3-console.o
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obj-$(CONFIG_USB_EHCI_HCD) += sead3-ehci.o
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obj-$(CONFIG_OF) += sead3.dtb.o
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CFLAGS_sead3-setup.o = -I$(src)/../../../scripts/dtc/libfdt
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$(obj)/%.dtb: $(obj)/%.dts
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$(call if_changed,dtc)
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@ -4,13 +4,16 @@
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* for more details.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*/
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#include <linux/init.h>
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#include <linux/libfdt.h>
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#include <linux/of_platform.h>
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#include <linux/of_fdt.h>
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#include <linux/bootmem.h>
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#include <asm/prom.h>
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#include <asm/fw/fw.h>
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#include <asm/mips-boards/generic.h>
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@ -19,8 +22,73 @@ const char *get_system_type(void)
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return "MIPS SEAD3";
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}
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static uint32_t get_memsize_from_cmdline(void)
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{
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int memsize = 0;
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char *p = arcs_cmdline;
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char *s = "memsize=";
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p = strstr(p, s);
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if (p) {
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p += strlen(s);
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memsize = memparse(p, NULL);
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}
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return memsize;
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}
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static uint32_t get_memsize_from_env(void)
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{
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int memsize = 0;
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char *p;
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p = fw_getenv("memsize");
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if (p)
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memsize = memparse(p, NULL);
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return memsize;
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}
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static uint32_t get_memsize(void)
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{
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uint32_t memsize;
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memsize = get_memsize_from_cmdline();
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if (memsize)
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return memsize;
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return get_memsize_from_env();
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}
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static void __init parse_memsize_param(void)
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{
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int offset;
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const uint64_t *prop_value;
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int prop_len;
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uint32_t memsize = get_memsize();
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if (!memsize)
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return;
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offset = fdt_path_offset(&__dtb_start, "/memory");
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if (offset > 0) {
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uint64_t new_value;
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/*
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* reg contains 2 32-bits BE values, offset and size. We just
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* want to replace the size value without affecting the offset
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*/
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prop_value = fdt_getprop(&__dtb_start, offset, "reg", &prop_len);
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new_value = be64_to_cpu(*prop_value);
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new_value = (new_value & ~0xffffffffllu) | memsize;
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fdt_setprop_inplace_u64(&__dtb_start, offset, "reg", new_value);
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}
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}
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void __init plat_mem_setup(void)
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{
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/* allow command line/bootloader env to override memory size in DT */
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parse_memsize_param();
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/*
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* Load the builtin devicetree. This causes the chosen node to be
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* parsed resulting in our memory appearing
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