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1 | /* | |
2 | * Copyright 2010-2011 Calxeda, Inc. | |
3 | * Copyright 2012 Pavel Machek <pavel@denx.de> | |
4 | * Based on platsmp.c, Copyright (C) 2002 ARM Ltd. | |
5 | * Copyright (C) 2012 Altera Corporation | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | #include <linux/delay.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/io.h> | |
23 | #include <linux/of.h> | |
24 | #include <linux/of_address.h> | |
25 | ||
26 | #include <asm/cacheflush.h> | |
27 | #include <asm/smp_scu.h> | |
28 | #include <asm/smp_plat.h> | |
29 | ||
30 | #include "core.h" | |
31 | ||
32 | static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle) | |
33 | { | |
34 | int trampoline_size = &secondary_trampoline_end - &secondary_trampoline; | |
35 | ||
36 | if (socfpga_cpu1start_addr) { | |
37 | /* This will put CPU #1 into reset. */ | |
38 | writel(RSTMGR_MPUMODRST_CPU1, | |
39 | rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST); | |
40 | ||
41 | memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); | |
42 | ||
43 | writel(__pa_symbol(secondary_startup), | |
44 | sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff)); | |
45 | ||
46 | flush_cache_all(); | |
47 | smp_wmb(); | |
48 | outer_clean_range(0, trampoline_size); | |
49 | ||
50 | /* This will release CPU #1 out of reset. */ | |
51 | writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST); | |
52 | } | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle) | |
58 | { | |
59 | int trampoline_size = &secondary_trampoline_end - &secondary_trampoline; | |
60 | ||
61 | if (socfpga_cpu1start_addr) { | |
62 | writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr + | |
63 | SOCFPGA_A10_RSTMGR_MODMPURST); | |
64 | memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); | |
65 | ||
66 | writel(__pa_symbol(secondary_startup), | |
67 | sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff)); | |
68 | ||
69 | flush_cache_all(); | |
70 | smp_wmb(); | |
71 | outer_clean_range(0, trampoline_size); | |
72 | ||
73 | /* This will release CPU #1 out of reset. */ | |
74 | writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST); | |
75 | } | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus) | |
81 | { | |
82 | struct device_node *np; | |
83 | void __iomem *socfpga_scu_base_addr; | |
84 | ||
85 | np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); | |
86 | if (!np) { | |
87 | pr_err("%s: missing scu\n", __func__); | |
88 | return; | |
89 | } | |
90 | ||
91 | socfpga_scu_base_addr = of_iomap(np, 0); | |
92 | if (!socfpga_scu_base_addr) | |
93 | return; | |
94 | scu_enable(socfpga_scu_base_addr); | |
95 | } | |
96 | ||
97 | #ifdef CONFIG_HOTPLUG_CPU | |
98 | /* | |
99 | * platform-specific code to shutdown a CPU | |
100 | * | |
101 | * Called with IRQs disabled | |
102 | */ | |
103 | static void socfpga_cpu_die(unsigned int cpu) | |
104 | { | |
105 | /* Do WFI. If we wake up early, go back into WFI */ | |
106 | while (1) | |
107 | cpu_do_idle(); | |
108 | } | |
109 | ||
110 | /* | |
111 | * We need a dummy function so that platform_can_cpu_hotplug() knows | |
112 | * we support CPU hotplug. However, the function does not need to do | |
113 | * anything, because CPUs going offline just do WFI. We could reset | |
114 | * the CPUs but it would increase power consumption. | |
115 | */ | |
116 | static int socfpga_cpu_kill(unsigned int cpu) | |
117 | { | |
118 | return 1; | |
119 | } | |
120 | #endif | |
121 | ||
122 | static const struct smp_operations socfpga_smp_ops __initconst = { | |
123 | .smp_prepare_cpus = socfpga_smp_prepare_cpus, | |
124 | .smp_boot_secondary = socfpga_boot_secondary, | |
125 | #ifdef CONFIG_HOTPLUG_CPU | |
126 | .cpu_die = socfpga_cpu_die, | |
127 | .cpu_kill = socfpga_cpu_kill, | |
128 | #endif | |
129 | }; | |
130 | ||
131 | static const struct smp_operations socfpga_a10_smp_ops __initconst = { | |
132 | .smp_prepare_cpus = socfpga_smp_prepare_cpus, | |
133 | .smp_boot_secondary = socfpga_a10_boot_secondary, | |
134 | #ifdef CONFIG_HOTPLUG_CPU | |
135 | .cpu_die = socfpga_cpu_die, | |
136 | .cpu_kill = socfpga_cpu_kill, | |
137 | #endif | |
138 | }; | |
139 | ||
140 | CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops); | |
141 | CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops); |