1// SPDX-License-Identifier: GPL-2.0-or-later
2// Copyright (C) ASPEED Technology Inc.
3// Copyright IBM Corp.
4
5#include <linux/of_address.h>
6#include <linux/io.h>
7#include <linux/of.h>
8#include <linux/smp.h>
9
10#define BOOT_ADDR	0x00
11#define BOOT_SIG	0x04
12
13static struct device_node *secboot_node;
14
15static int aspeed_g6_boot_secondary(unsigned int cpu, struct task_struct *idle)
16{
17	void __iomem *base;
18
19	base = of_iomap(secboot_node, 0);
20	if (!base) {
21		pr_err("could not map the secondary boot base!");
22		return -ENODEV;
23	}
24
25	writel_relaxed(0, base + BOOT_ADDR);
26	writel_relaxed(__pa_symbol(secondary_startup_arm), base + BOOT_ADDR);
27	writel_relaxed((0xABBAAB00 | (cpu & 0xff)), base + BOOT_SIG);
28
29	dsb_sev();
30
31	iounmap(base);
32
33	return 0;
34}
35
36static void __init aspeed_g6_smp_prepare_cpus(unsigned int max_cpus)
37{
38	void __iomem *base;
39
40	secboot_node = of_find_compatible_node(NULL, NULL, "aspeed,ast2600-smpmem");
41	if (!secboot_node) {
42		pr_err("secboot device node found!!\n");
43		return;
44	}
45
46	base = of_iomap(secboot_node, 0);
47	if (!base) {
48		pr_err("could not map the secondary boot base!");
49		return;
50	}
51	__raw_writel(0xBADABABA, base + BOOT_SIG);
52
53	iounmap(base);
54}
55
56static const struct smp_operations aspeed_smp_ops __initconst = {
57	.smp_prepare_cpus	= aspeed_g6_smp_prepare_cpus,
58	.smp_boot_secondary	= aspeed_g6_boot_secondary,
59};
60
61CPU_METHOD_OF_DECLARE(aspeed_smp, "aspeed,ast2600-smp", &aspeed_smp_ops);
62