1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/arm/mach-mediatek/platsmp.c
4 *
5 * Copyright (c) 2014 Mediatek Inc.
6 * Author: Shunli Wang <shunli.wang@mediatek.com>
7 * Yingjoe Chen <yingjoe.chen@mediatek.com>
8 */
9 #include <linux/io.h>
10 #include <linux/memblock.h>
11 #include <linux/of.h>
12 #include <linux/of_address.h>
13 #include <linux/string.h>
14 #include <linux/threads.h>
15
16 #define MTK_MAX_CPU 8
17 #define MTK_SMP_REG_SIZE 0x1000
18
19 struct mtk_smp_boot_info {
20 unsigned long smp_base;
21 unsigned int jump_reg;
22 unsigned int core_keys[MTK_MAX_CPU - 1];
23 unsigned int core_regs[MTK_MAX_CPU - 1];
24 };
25
26 static const struct mtk_smp_boot_info mtk_mt8135_tz_boot = {
27 0x80002000, 0x3fc,
28 { 0x534c4131, 0x4c415332, 0x41534c33 },
29 { 0x3f8, 0x3f8, 0x3f8 },
30 };
31
32 static const struct mtk_smp_boot_info mtk_mt6589_boot = {
33 0x10002000, 0x34,
34 { 0x534c4131, 0x4c415332, 0x41534c33 },
35 { 0x38, 0x3c, 0x40 },
36 };
37
38 static const struct mtk_smp_boot_info mtk_mt7623_boot = {
39 0x10202000, 0x34,
40 { 0x534c4131, 0x4c415332, 0x41534c33 },
41 { 0x38, 0x3c, 0x40 },
42 };
43
44 static const struct of_device_id mtk_tz_smp_boot_infos[] __initconst = {
45 { .compatible = "mediatek,mt8135", .data = &mtk_mt8135_tz_boot },
46 { .compatible = "mediatek,mt8127", .data = &mtk_mt8135_tz_boot },
47 { .compatible = "mediatek,mt2701", .data = &mtk_mt8135_tz_boot },
48 {},
49 };
50
51 static const struct of_device_id mtk_smp_boot_infos[] __initconst = {
52 { .compatible = "mediatek,mt6589", .data = &mtk_mt6589_boot },
53 { .compatible = "mediatek,mt7623", .data = &mtk_mt7623_boot },
54 { .compatible = "mediatek,mt7629", .data = &mtk_mt7623_boot },
55 {},
56 };
57
58 static void __iomem *mtk_smp_base;
59 static const struct mtk_smp_boot_info *mtk_smp_info;
60
61 static int mtk_boot_secondary(unsigned int cpu, struct task_struct *idle)
62 {
63 if (!mtk_smp_base)
64 return -EINVAL;
65
66 if (!mtk_smp_info->core_keys[cpu-1])
67 return -EINVAL;
68
69 writel_relaxed(mtk_smp_info->core_keys[cpu-1],
70 mtk_smp_base + mtk_smp_info->core_regs[cpu-1]);
71
72 arch_send_wakeup_ipi_mask(cpumask_of(cpu));
73
74 return 0;
75 }
76
77 static void __init __mtk_smp_prepare_cpus(unsigned int max_cpus, int trustzone)
78 {
79 int i, num;
80 const struct of_device_id *infos;
81
82 if (trustzone) {
83 num = ARRAY_SIZE(mtk_tz_smp_boot_infos);
84 infos = mtk_tz_smp_boot_infos;
85 } else {
86 num = ARRAY_SIZE(mtk_smp_boot_infos);
87 infos = mtk_smp_boot_infos;
88 }
89
90 /* Find smp boot info for this SoC */
91 for (i = 0; i < num; i++) {
92 if (of_machine_is_compatible(infos[i].compatible)) {
93 mtk_smp_info = infos[i].data;
94 break;
95 }
96 }
97
98 if (!mtk_smp_info) {
99 pr_err("%s: Device is not supported\n", __func__);
100 return;
101 }
102
103 if (trustzone) {
104 /* smp_base(trustzone-bootinfo) is reserved by device tree */
105 mtk_smp_base = phys_to_virt(mtk_smp_info->smp_base);
106 } else {
107 mtk_smp_base = ioremap(mtk_smp_info->smp_base, MTK_SMP_REG_SIZE);
108 if (!mtk_smp_base) {
109 pr_err("%s: Can't remap %lx\n", __func__,
110 mtk_smp_info->smp_base);
111 return;
112 }
113 }
114
115 /*
116 * write the address of slave startup address into the system-wide
117 * jump register
118 */
119 writel_relaxed(__pa_symbol(secondary_startup_arm),
120 mtk_smp_base + mtk_smp_info->jump_reg);
121 }
122
123 static void __init mtk_tz_smp_prepare_cpus(unsigned int max_cpus)
124 {
125 __mtk_smp_prepare_cpus(max_cpus, 1);
126 }
127
128 static void __init mtk_smp_prepare_cpus(unsigned int max_cpus)
129 {
130 __mtk_smp_prepare_cpus(max_cpus, 0);
131 }
132
133 static const struct smp_operations mt81xx_tz_smp_ops __initconst = {
134 .smp_prepare_cpus = mtk_tz_smp_prepare_cpus,
135 .smp_boot_secondary = mtk_boot_secondary,
136 };
137 CPU_METHOD_OF_DECLARE(mt81xx_tz_smp, "mediatek,mt81xx-tz-smp", &mt81xx_tz_smp_ops);
138
139 static const struct smp_operations mt6589_smp_ops __initconst = {
140 .smp_prepare_cpus = mtk_smp_prepare_cpus,
141 .smp_boot_secondary = mtk_boot_secondary,
142 };
143 CPU_METHOD_OF_DECLARE(mt6589_smp, "mediatek,mt6589-smp", &mt6589_smp_ops);
144
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.