rpi4: Amend DTB to advertise PSCI
The device tree provided by the official Raspberry Pi firmware uses spin tables for SMP bringup. One of the benefit of having TF-A is that it provides PSCI services, so let's rewrite the DTB to advertise PSCI instead of spin tables. This uses the (newly exported) routine from the QEMU platform port. Change-Id: Ifddcb14041ca253a333f8c2d5e97a42db152470c Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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@ -25,6 +25,7 @@ BL31_SOURCES += lib/cpus/aarch64/cortex_a72.S \
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plat/rpi/common/rpi3_pm.c \
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plat/common/plat_psci_common.c \
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plat/rpi/common/rpi3_topology.c \
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common/fdt_fixup.c \
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${LIBFDT_SRCS}
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# For now we only support BL31, using the kernel loaded by the GPU firmware.
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@ -9,12 +9,15 @@
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#include <libfdt.h>
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#include <platform_def.h>
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#include <arch_helpers.h>
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#include <common/bl_common.h>
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#include <lib/mmio.h>
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#include <lib/xlat_tables/xlat_mmu_helpers.h>
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#include <lib/xlat_tables/xlat_tables_defs.h>
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#include <lib/xlat_tables/xlat_tables_v2.h>
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#include <plat/common/platform.h>
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#include <common/fdt_fixup.h>
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#include <libfdt.h>
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#include <drivers/arm/gicv2.h>
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@ -179,6 +182,18 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
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void bl31_plat_arch_setup(void)
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{
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/*
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* Is the dtb_ptr32 pointer valid? If yes, map the DTB region.
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* We map the 2MB region the DTB start address lives in, plus
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* the next 2MB, to have enough room for expansion.
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*/
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if (stub_magic == 0) {
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unsigned long long dtb_region = dtb_ptr32;
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dtb_region &= ~0x1fffff; /* Align to 2 MB. */
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mmap_add_region(dtb_region, dtb_region, 4U << 20,
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MT_MEMORY | MT_RW | MT_NS);
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}
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/*
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* Add the first page of memory, which holds the stub magic,
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* the kernel and the DT address.
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@ -198,8 +213,50 @@ void bl31_plat_arch_setup(void)
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enable_mmu_el3(0);
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}
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static uint32_t dtb_size(const void *dtb)
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{
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const uint32_t *dtb_header = dtb;
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return fdt32_to_cpu(dtb_header[1]);
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}
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static void rpi4_prepare_dtb(void)
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{
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void *dtb = (void *)rpi4_get_dtb_address();
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int ret;
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/* Return if no device tree is detected */
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if (fdt_check_header(dtb) != 0)
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return;
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ret = fdt_open_into(dtb, dtb, 0x100000);
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if (ret < 0) {
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ERROR("Invalid Device Tree at %p: error %d\n", dtb, ret);
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return;
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}
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if (dt_add_psci_node(dtb)) {
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ERROR("Failed to add PSCI Device Tree node\n");
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return;
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}
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if (dt_add_psci_cpu_enable_methods(dtb)) {
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ERROR("Failed to add PSCI cpu enable methods in Device Tree\n");
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return;
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}
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ret = fdt_pack(dtb);
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if (ret < 0)
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ERROR("Failed to pack Device Tree at %p: error %d\n", dtb, ret);
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clean_dcache_range((uintptr_t)dtb, dtb_size(dtb));
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INFO("Changed device tree to advertise PSCI.\n");
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}
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void bl31_platform_setup(void)
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{
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rpi4_prepare_dtb();
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/* Configure the interrupt controller */
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gicv2_driver_init(&rpi4_gic_data);
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gicv2_distif_init();
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