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authorQais Yousef <qais.yousef@imgtec.com>2013-12-06 11:00:42 +0000
committerRalf Baechle <ralf@linux-mips.org>2014-01-23 13:02:36 +0100
commit44327236c3bfb83e3b4ce36e2a0d61569bb19330 (patch)
tree76e87d019bfd1670671fed35f385b7a47a5a836d /arch/mips/mti-sead3
parente95acd3d0d3a7bac9bca50c51a1d86777b6334eb (diff)
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op-kernel-dev-44327236c3bfb83e3b4ce36e2a0d61569bb19330.tar.gz
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/
Diffstat (limited to 'arch/mips/mti-sead3')
-rw-r--r--arch/mips/mti-sead3/Makefile2
-rw-r--r--arch/mips/mti-sead3/sead3-setup.c68
2 files changed, 70 insertions, 0 deletions
diff --git a/arch/mips/mti-sead3/Makefile b/arch/mips/mti-sead3/Makefile
index be11420..071786f 100644
--- a/arch/mips/mti-sead3/Makefile
+++ b/arch/mips/mti-sead3/Makefile
@@ -21,5 +21,7 @@ obj-$(CONFIG_EARLY_PRINTK) += sead3-console.o
obj-$(CONFIG_USB_EHCI_HCD) += sead3-ehci.o
obj-$(CONFIG_OF) += sead3.dtb.o
+CFLAGS_sead3-setup.o = -I$(src)/../../../scripts/dtc/libfdt
+
$(obj)/%.dtb: $(obj)/%.dts
$(call if_changed,dtc)
diff --git a/arch/mips/mti-sead3/sead3-setup.c b/arch/mips/mti-sead3/sead3-setup.c
index 928ba84..a499f99 100644
--- a/arch/mips/mti-sead3/sead3-setup.c
+++ b/arch/mips/mti-sead3/sead3-setup.c
@@ -4,13 +4,16 @@
* for more details.
*
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
+ * Copyright (C) 2013 Imagination Technologies Ltd.
*/
#include <linux/init.h>
+#include <linux/libfdt.h>
#include <linux/of_platform.h>
#include <linux/of_fdt.h>
#include <linux/bootmem.h>
#include <asm/prom.h>
+#include <asm/fw/fw.h>
#include <asm/mips-boards/generic.h>
@@ -19,8 +22,73 @@ const char *get_system_type(void)
return "MIPS SEAD3";
}
+static uint32_t get_memsize_from_cmdline(void)
+{
+ int memsize = 0;
+ char *p = arcs_cmdline;
+ char *s = "memsize=";
+
+ p = strstr(p, s);
+ if (p) {
+ p += strlen(s);
+ memsize = memparse(p, NULL);
+ }
+
+ return memsize;
+}
+
+static uint32_t get_memsize_from_env(void)
+{
+ int memsize = 0;
+ char *p;
+
+ p = fw_getenv("memsize");
+ if (p)
+ memsize = memparse(p, NULL);
+
+ return memsize;
+}
+
+static uint32_t get_memsize(void)
+{
+ uint32_t memsize;
+
+ memsize = get_memsize_from_cmdline();
+ if (memsize)
+ return memsize;
+
+ return get_memsize_from_env();
+}
+
+static void __init parse_memsize_param(void)
+{
+ int offset;
+ const uint64_t *prop_value;
+ int prop_len;
+ uint32_t memsize = get_memsize();
+
+ if (!memsize)
+ return;
+
+ offset = fdt_path_offset(&__dtb_start, "/memory");
+ if (offset > 0) {
+ uint64_t new_value;
+ /*
+ * reg contains 2 32-bits BE values, offset and size. We just
+ * want to replace the size value without affecting the offset
+ */
+ prop_value = fdt_getprop(&__dtb_start, offset, "reg", &prop_len);
+ new_value = be64_to_cpu(*prop_value);
+ new_value = (new_value & ~0xffffffffllu) | memsize;
+ fdt_setprop_inplace_u64(&__dtb_start, offset, "reg", new_value);
+ }
+}
+
void __init plat_mem_setup(void)
{
+ /* allow command line/bootloader env to override memory size in DT */
+ parse_memsize_param();
+
/*
* Load the builtin devicetree. This causes the chosen node to be
* parsed resulting in our memory appearing
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