1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Symmetric Multi Processing (SMP) support fo
4 * based SOCs (Armada 375/38x).
5 *
6 * Copyright (C) 2014 Marvell
7 *
8 * Gregory CLEMENT <gregory.clement@free-elect
9 * Thomas Petazzoni <thomas.petazzoni@free-ele
10 */
11
12 #include <linux/init.h>
13 #include <linux/io.h>
14 #include <linux/of.h>
15 #include <linux/smp.h>
16 #include <linux/mbus.h>
17 #include <asm/smp_scu.h>
18 #include <asm/smp_plat.h>
19 #include "common.h"
20 #include "pmsu.h"
21
22 extern void mvebu_cortex_a9_secondary_startup(
23
24 static int mvebu_cortex_a9_boot_secondary(unsi
25
26 {
27 int ret, hw_cpu;
28
29 pr_info("Booting CPU %d\n", cpu);
30
31 /*
32 * Write the address of secondary star
33 * flags register. The boot monitor wa
34 * soft interrupt, and then the second
35 * address.
36 */
37 hw_cpu = cpu_logical_map(cpu);
38 if (of_machine_is_compatible("marvell,
39 mvebu_system_controller_set_cp
40 else
41 mvebu_pmsu_set_cpu_boot_addr(h
42 smp_wmb();
43
44 /*
45 * Doing this before deasserting the C
46 * in the offline state after using CP
47 */
48 arch_send_wakeup_ipi_mask(cpumask_of(c
49
50 ret = mvebu_cpu_reset_deassert(hw_cpu)
51 if (ret) {
52 pr_err("Could not start the se
53 return ret;
54 }
55
56 return 0;
57 }
58 /*
59 * When a CPU is brought back online, either t
60 * because of the boot of a kexec'ed kernel, t
61 * for this CPU might be in the deep idle stat
62 * from receiving interrupts. Here, we therefo
63 * CPU from this state, which was entered by a
64 * below.
65 */
66 static void armada_38x_secondary_init(unsigned
67 {
68 mvebu_v7_pmsu_idle_exit();
69 }
70
71 #ifdef CONFIG_HOTPLUG_CPU
72 static void armada_38x_cpu_die(unsigned int cp
73 {
74 /*
75 * CPU hotplug is implemented by putti
76 * deep idle sleep state.
77 */
78 armada_38x_do_cpu_suspend(true);
79 }
80
81 /*
82 * We need a dummy function, so that platform_
83 * we support CPU hotplug. However, the functi
84 * anything, because CPUs going offline can en
85 * by themselves, without any help from a stil
86 */
87 static int armada_38x_cpu_kill(unsigned int cp
88 {
89 return 1;
90 }
91 #endif
92
93 static const struct smp_operations mvebu_corte
94 .smp_boot_secondary = mvebu_cortex
95 };
96
97 static const struct smp_operations armada_38x_
98 .smp_boot_secondary = mvebu_cortex
99 .smp_secondary_init = armada_38x_s
100 #ifdef CONFIG_HOTPLUG_CPU
101 .cpu_die = armada_38x_c
102 .cpu_kill = armada_38x_c
103 #endif
104 };
105
106 CPU_METHOD_OF_DECLARE(mvebu_armada_375_smp, "m
107 &mvebu_cortex_a9_smp_ops
108 CPU_METHOD_OF_DECLARE(mvebu_armada_380_smp, "m
109 &armada_38x_smp_ops);
110 CPU_METHOD_OF_DECLARE(mvebu_armada_390_smp, "m
111 &armada_38x_smp_ops);
112
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