// SPDX-License-Identifier: GPL-2.0-or-later // Copyright (C) ASPEED Technology Inc. // Copyright IBM Corp. #include <linux/of_address.h> #include <linux/io.h> #include <linux/of.h> #include <linux/smp.h> #define BOOT_ADDR 0x00 #define BOOT_SIG 0x04 static struct device_node *secboot_node; static int aspeed_g6_boot_secondary(unsigned int cpu, struct task_struct *idle) { void __iomem *base; base = of_iomap(secboot_node, 0); if (!base) { pr_err("could not map the secondary boot base!"); return -ENODEV; } writel_relaxed(0, base + BOOT_ADDR); writel_relaxed(__pa_symbol(secondary_startup_arm), base + BOOT_ADDR); writel_relaxed((0xABBAAB00 | (cpu & 0xff)), base + BOOT_SIG); dsb_sev(); iounmap(base); return 0; } static void __init aspeed_g6_smp_prepare_cpus(unsigned int max_cpus) { void __iomem *base; secboot_node = of_find_compatible_node(NULL, NULL, "aspeed,ast2600-smpmem"); if (!secboot_node) { pr_err("secboot device node found!!\n"); return; } base = of_iomap(secboot_node, 0); if (!base) { pr_err("could not map the secondary boot base!"); return; } __raw_writel(0xBADABABA, base + BOOT_SIG); iounmap(base); } static const struct smp_operations aspeed_smp_ops __initconst = { .smp_prepare_cpus = aspeed_g6_smp_prepare_cpus, .smp_boot_secondary = aspeed_g6_boot_secondary, }; CPU_METHOD_OF_DECLARE(aspeed_smp, "aspeed,ast2600-smp", &aspeed_smp_ops);