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https://github.com/AsahiLinux/u-boot
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70aa5a94d4
AM62x SoC is available in multiple variant: - CPU cores (Cortex-A) AM62x1 (1 core), AM62x2 (2 cores), AM62x4 (4 cores) - GPU AM625x with GPU, AM623x without GPU - PRU (Programmable RT unit) can be present or not on AM62x2/AM62x4 Remove the relevant FDT nodes by reading the actual configuration from the SoC registers, with that change is possible to have a single dts/dtb file handling the different variant at runtime. While removing GPU node and CPU nodes also the watchdog node in the same Module Domain is removed. A similar approach is implemented for example on i.MX8 and STM32MP1 SoC. Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com> Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2023 Toradex - https://www.toradex.com/
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*/
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#include <asm/hardware.h>
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#include "common_fdt.h"
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#include <fdt_support.h>
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static void fdt_fixup_cores_nodes_am625(void *blob, int core_nr)
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{
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char node_path[32];
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if (core_nr < 1)
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return;
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for (; core_nr < 4; core_nr++) {
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snprintf(node_path, sizeof(node_path), "/cpus/cpu@%d", core_nr);
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fdt_del_node_path(blob, node_path);
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snprintf(node_path, sizeof(node_path), "/cpus/cpu-map/cluster0/core%d", core_nr);
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fdt_del_node_path(blob, node_path);
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snprintf(node_path, sizeof(node_path), "/bus@f0000/watchdog@e0%d0000", core_nr);
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fdt_del_node_path(blob, node_path);
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}
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}
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static void fdt_fixup_gpu_nodes_am625(void *blob, int has_gpu)
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{
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if (!has_gpu) {
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fdt_del_node_path(blob, "/bus@f0000/gpu@fd00000");
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fdt_del_node_path(blob, "/bus@f0000/watchdog@e0f0000");
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}
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}
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static void fdt_fixup_pru_node_am625(void *blob, int has_pru)
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{
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if (!has_pru)
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fdt_del_node_path(blob, "/bus@f0000/pruss@30040000");
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}
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static int k3_get_core_nr(void)
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{
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u32 full_devid = readl(CTRLMMR_WKUP_JTAG_DEVICE_ID);
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return (full_devid & JTAG_DEV_CORE_NR_MASK) >> JTAG_DEV_CORE_NR_SHIFT;
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}
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static int k3_has_pru(void)
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{
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u32 full_devid = readl(CTRLMMR_WKUP_JTAG_DEVICE_ID);
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u32 feature_mask = (full_devid & JTAG_DEV_FEATURES_MASK) >>
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JTAG_DEV_FEATURES_SHIFT;
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return !(feature_mask & JTAG_DEV_FEATURE_NO_PRU);
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}
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static int k3_has_gpu(void)
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{
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u32 full_devid = readl(CTRLMMR_WKUP_JTAG_DEVICE_ID);
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return (full_devid & JTAG_DEV_GPU_MASK) >> JTAG_DEV_GPU_SHIFT;
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}
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int ft_system_setup(void *blob, struct bd_info *bd)
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{
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fdt_fixup_cores_nodes_am625(blob, k3_get_core_nr());
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fdt_fixup_gpu_nodes_am625(blob, k3_has_gpu());
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fdt_fixup_pru_node_am625(blob, k3_has_pru());
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return 0;
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}
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