mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
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e2b18771fc
When using SCPI as the PSCI backend, firmware can wake up the CPUs and cluster from sleep, so CPU idle states are available for the rich OS to use. In that case, advertise them to the rich OS via the DTB. Change-Id: I718ef6ef41212fe5213b11b4799613adbbe6e0eb Signed-off-by: Samuel Holland <samuel@sholland.org>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/*
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* Copyright (c) 2021, ARM Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <libfdt.h>
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#include <common/debug.h>
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#include <common/fdt_fixup.h>
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#include <common/fdt_wrappers.h>
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#include <sunxi_private.h>
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void sunxi_prepare_dtb(void *fdt)
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{
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int ret;
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if (fdt == NULL || fdt_check_header(fdt) != 0) {
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return;
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}
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ret = fdt_open_into(fdt, fdt, 0x10000);
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if (ret < 0) {
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ERROR("Preparing devicetree at %p: error %d\n", fdt, ret);
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return;
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}
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#ifdef SUNXI_BL31_IN_DRAM
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/* Reserve memory used by Trusted Firmware. */
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if (fdt_add_reserved_memory(fdt, "tf-a@40000000", BL31_BASE,
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BL31_LIMIT - BL31_BASE)) {
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WARN("Failed to add reserved memory nodes to DT.\n");
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}
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#endif
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if (sunxi_psci_is_scpi()) {
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ret = fdt_add_cpu_idle_states(fdt, sunxi_idle_states);
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if (ret < 0) {
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WARN("Failed to add idle states to DT: %d\n", ret);
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}
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}
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ret = fdt_pack(fdt);
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if (ret < 0) {
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ERROR("Failed to pack devicetree at %p: error %d\n",
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fdt, ret);
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}
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clean_dcache_range((uintptr_t)fdt, fdt_blob_size(fdt));
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INFO("Changed devicetree.\n");
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}
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