Add two functions for use by board implementations to decode the memory banks of the /memory node so as to populate the global data with ram_size and board info for memory banks.
The fdtdec_setup_memory_size() function decodes the first memory bank and sets up the gd->ram_size with the size of the memory bank. This function should be called from the boards dram_init().
The fdtdec_setup_memory_banksize() function decode the memory banks (up to the CONFIG_NR_DRAM_BANKS) and populates the base address and size into the gd->bd->bi_dram array of banks. This function should be called from the boards dram_init_banksize().
Signed-off-by: Nathan Rossi nathan@nathanrossi.com Cc: Simon Glass sjg@chromium.org Cc: Michal Simek monstr@monstr.eu Reviewed-by: Simon Glass sjg@chromium.org --- v2: * Make fdtdec_setup_memory_banksize() return value consistent * Add more detail into the function documentation
This implementation of decoding has been tested on zynq and zynqmp boards with address/size cells of (1, 1), (1, 2), (2, 1), (2, 2) and up to 2 memory banks. --- include/fdtdec.h | 34 ++++++++++++++++++++++++++++++++++ lib/fdtdec.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 88 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h index 27887c8c21..d074478f14 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -976,6 +976,40 @@ struct display_timing { */ int fdtdec_decode_display_timing(const void *blob, int node, int index, struct display_timing *config); + +/** + * fdtdec_setup_memory_size() - decode and setup gd->ram_size + * + * Decode the /memory 'reg' property to determine the size of the first memory + * bank, populate the global data with the size 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 instead of + * hard coding the value in the case where the memory size cannot be detected + * automatically. + * + * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or + * invalid + */ +int fdtdec_setup_memory_size(void); + +/** + * fdtdec_setup_memory_banksize() - decode and populate gd->bd->bi_dram + * + * Decode the /memory 'reg' property to determine the address and size of the + * memory banks. Use this data to populate the global data board info with the + * phys address and size of memory banks. + * + * This function should be called from a boards dram_init_banksize(). This + * helper function allows for boards to query the device tree for memory bank + * information instead of hard coding the information in cases where it cannot + * be detected automatically. + * + * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or + * invalid + */ +int fdtdec_setup_memory_banksize(void); + /** * Set up the device tree ready for use */ diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 4e619c49a2..3bf9ff84f4 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -1174,6 +1174,60 @@ int fdtdec_decode_display_timing(const void *blob, int parent, int index, return ret; }
+int fdtdec_setup_memory_size(void) +{ + int ret, mem; + struct fdt_resource res; + + mem = fdt_path_offset(gd->fdt_blob, "/memory"); + if (mem < 0) { + debug("%s: Missing /memory node\n", __func__); + return -EINVAL; + } + + ret = fdt_get_resource(gd->fdt_blob, mem, "reg", 0, &res); + if (ret != 0) { + debug("%s: Unable to decode first memory bank\n", __func__); + return -EINVAL; + } + + gd->ram_size = (phys_size_t)(res.end - res.start + 1); + debug("%s: Initial DRAM size %llx\n", __func__, (u64)gd->ram_size); + + return 0; +} + +int fdtdec_setup_memory_banksize(void) +{ + int bank, ret, mem; + struct fdt_resource res; + + mem = fdt_path_offset(gd->fdt_blob, "/memory"); + if (mem < 0) { + debug("%s: Missing /memory node\n", __func__); + return -EINVAL; + } + + for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) { + ret = fdt_get_resource(gd->fdt_blob, mem, "reg", bank, &res); + if (ret == -FDT_ERR_NOTFOUND) + break; + if (ret != 0) + return -EINVAL; + + gd->bd->bi_dram[bank].start = (phys_addr_t)res.start; + gd->bd->bi_dram[bank].size = + (phys_size_t)(res.end - res.start + 1); + + debug("%s: DRAM Bank #%d: start = 0x%llx, size = 0x%llx\n", + __func__, bank, + (unsigned long long)gd->bd->bi_dram[bank].start, + (unsigned long long)gd->bd->bi_dram[bank].size); + } + + return 0; +} + int fdtdec_setup(void) { #if CONFIG_IS_ENABLED(OF_CONTROL)