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ba56a987 MY |
1 | /* |
2 | * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/sizes.h> | |
16 | #include <linux/compiler.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/regmap.h> | |
20 | #include <linux/mfd/syscon.h> | |
21 | #include <asm/smp.h> | |
22 | #include <asm/smp_scu.h> | |
23 | ||
24 | static struct regmap *sbcm_regmap; | |
25 | ||
26 | static void __init uniphier_smp_prepare_cpus(unsigned int max_cpus) | |
27 | { | |
28 | static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 }; | |
29 | unsigned long scu_base_phys = 0; | |
30 | void __iomem *scu_base; | |
31 | ||
32 | sbcm_regmap = syscon_regmap_lookup_by_compatible( | |
33 | "socionext,uniphier-system-bus-controller-misc"); | |
34 | if (IS_ERR(sbcm_regmap)) { | |
35 | pr_err("failed to regmap system-bus-controller-misc\n"); | |
36 | goto err; | |
37 | } | |
38 | ||
39 | if (scu_a9_has_base()) | |
40 | scu_base_phys = scu_a9_get_base(); | |
41 | ||
42 | if (!scu_base_phys) { | |
43 | pr_err("failed to get scu base\n"); | |
44 | goto err; | |
45 | } | |
46 | ||
47 | scu_base = ioremap(scu_base_phys, SZ_128); | |
48 | if (!scu_base) { | |
49 | pr_err("failed to remap scu base (0x%08lx)\n", scu_base_phys); | |
50 | goto err; | |
51 | } | |
52 | ||
53 | scu_enable(scu_base); | |
54 | iounmap(scu_base); | |
55 | ||
56 | return; | |
57 | err: | |
58 | pr_warn("disabling SMP\n"); | |
59 | init_cpu_present(&only_cpu_0); | |
60 | sbcm_regmap = NULL; | |
61 | } | |
62 | ||
ba56a987 MY |
63 | static int uniphier_boot_secondary(unsigned int cpu, |
64 | struct task_struct *idle) | |
65 | { | |
66 | int ret; | |
67 | ||
68 | if (!sbcm_regmap) | |
69 | return -ENODEV; | |
70 | ||
71 | ret = regmap_write(sbcm_regmap, 0x1208, | |
fb3c4426 | 72 | virt_to_phys(secondary_startup)); |
ba56a987 MY |
73 | if (!ret) |
74 | asm("sev"); /* wake up secondary CPU */ | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
79 | struct smp_operations uniphier_smp_ops __initdata = { | |
80 | .smp_prepare_cpus = uniphier_smp_prepare_cpus, | |
81 | .smp_boot_secondary = uniphier_boot_secondary, | |
82 | }; | |
83 | CPU_METHOD_OF_DECLARE(uniphier_smp, "socionext,uniphier-smp", | |
84 | &uniphier_smp_ops); |