riscv: Provide a mechanism to fix DT for reserved memory
In RISC-V, M-mode software can reserve physical memory regions
by setting appropriate physical memory protection (PMP) csr. As the
PMP csr are accessible only in M-mode, S-mode U-Boot can not read
this configuration directly. However, M-mode software can pass this
information via reserved-memory node in device tree so that S-mode
software can access this information.
This patch provides a framework to copy to the reserved-memory node
from one DT to another. This will be used to update the DT used by
U-Boot and the DT passed to the next stage OS.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/riscv/lib/fdt_fixup.c b/arch/riscv/lib/fdt_fixup.c
new file mode 100644
index 0000000..1fce414
--- /dev/null
+++ b/arch/riscv/lib/fdt_fixup.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates
+ *
+ */
+
+#include <common.h>
+#include <fdt_support.h>
+#include <mapmem.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * riscv_fdt_copy_resv_mem_node() - Copy reserve memory node entry
+ * @src: Pointer to the source device tree from which reserved memory node
+ * needs to be copied.
+ * @dst: Pointer to the destination device tree to which reserved memory node
+ * needs to be copied.
+ *
+ * Return: 0 on success or if source doesn't have reserved memory node.
+ * Error if copy process failed.
+ */
+int riscv_fdt_copy_resv_mem_node(const void *src, void *dst)
+{
+ u32 phandle;
+ struct fdt_memory pmp_mem;
+ fdt_addr_t addr;
+ fdt_size_t size;
+ int offset, node, err, rmem_offset;
+ bool nomap = true;
+ char basename[32] = {0};
+ int bname_len;
+ int max_len = sizeof(basename);
+ const char *name;
+ char *temp;
+
+ offset = fdt_path_offset(src, "/reserved-memory");
+ if (offset < 0) {
+ printf("No reserved memory region found in source FDT\n");
+ return 0;
+ }
+
+ fdt_for_each_subnode(node, src, offset) {
+ name = fdt_get_name(src, node, NULL);
+
+ addr = fdtdec_get_addr_size_auto_noparent(src, node,
+ "reg", 0, &size,
+ false);
+ if (addr == FDT_ADDR_T_NONE) {
+ debug("failed to read address/size for %s\n", name);
+ continue;
+ }
+ strncpy(basename, name, max_len);
+ temp = strchr(basename, '@');
+ if (temp) {
+ bname_len = strnlen(basename, max_len) - strnlen(temp,
+ max_len);
+ *(basename + bname_len) = '\0';
+ }
+ pmp_mem.start = addr;
+ pmp_mem.end = addr + size - 1;
+ err = fdtdec_add_reserved_memory(dst, basename, &pmp_mem,
+ &phandle);
+ if (err < 0) {
+ printf("failed to add reserved memory: %d\n", err);
+ return err;
+ }
+ if (!fdt_getprop(src, node, "no-map", NULL))
+ nomap = false;
+ if (nomap) {
+ rmem_offset = fdt_node_offset_by_phandle(dst, phandle);
+ fdt_setprop_empty(dst, rmem_offset, "no-map");
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * riscv_board_reserved_mem_fixup() - Fix up reserved memory node for a board
+ * @fdt: Pointer to the device tree in which reserved memory node needs to be
+ * added.
+ *
+ * In RISC-V, any board compiled with OF_SEPARATE needs to copy the reserved
+ * memory node from the device tree provided by the firmware to the device tree
+ * used by U-Boot. This is a common function that individual board fixup
+ * functions can invoke.
+ *
+ * Return: 0 on success or error otherwise.
+ */
+int riscv_board_reserved_mem_fixup(void *fdt)
+{
+ int err;
+ void *src_fdt_addr;
+
+ src_fdt_addr = map_sysmem(gd->arch.firmware_fdt_addr, 0);
+ err = riscv_fdt_copy_resv_mem_node(src_fdt_addr, fdt);
+ if (err < 0)
+ return err;
+
+ return 0;
+}