From: Bin Meng bin.meng@windriver.com
This adds a new API fdtdec_get_mem_size_base() that does similar thing to fdtdec_setup_mem_size_base_fdt(), but without assigning gd->ram_size and gd->ram_base.
Signed-off-by: Bin Meng bin.meng@windriver.com ---
include/fdtdec.h | 22 ++++++++++++++++++++++ lib/fdtdec.c | 24 ++++++++++++++++++++++++ 2 files changed, 46 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h index abd6d42..460d57a 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -909,6 +909,28 @@ int fdtdec_decode_display_timing(const void *blob, int node, int index, struct display_timing *config);
/** + * fdtdec_get_mem_size_base() - decode FDT to get ram size and base + * + * Decode the /memory 'reg' property to determine the size and start of the + * first memory bank, populate the global data with the size and start of the + * first bank of memory. + * + * This function should be called from a boards dram_init(). This helper + * function allows for boards to query the device tree for DRAM size and start + * address instead of hard coding the value in the case where the memory size + * and start address cannot be detected automatically. + * + * @param blob FDT blob + * @param ram_size buffer to hold the ram size to set + * @param ram_base buffer to hold the ram base to set + * + * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or + * invalid + */ +int fdtdec_get_mem_size_base(const void *blob, + phys_size_t *ram_size, unsigned long *ram_base); + +/** * fdtdec_setup_mem_size_base_fdt() - decode and setup gd->ram_size and * gd->ram_start * diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 0dd7ff1..078ff7a 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -1030,6 +1030,30 @@ int fdtdec_decode_display_timing(const void *blob, int parent, int index, return ret; }
+int fdtdec_get_mem_size_base(const void *blob, + phys_size_t *ram_size, unsigned long *ram_base) +{ + int ret, mem; + struct fdt_resource res; + + mem = fdt_path_offset(blob, "/memory"); + if (mem < 0) { + debug("%s: Missing /memory node\n", __func__); + return -EINVAL; + } + + ret = fdt_get_resource(blob, mem, "reg", 0, &res); + if (ret != 0) { + debug("%s: Unable to decode first memory bank\n", __func__); + return -EINVAL; + } + + *ram_size = (phys_size_t)(res.end - res.start + 1); + *ram_base = (unsigned long)res.start; + + return 0; +} + int fdtdec_setup_mem_size_base_fdt(const void *blob) { int ret, mem;