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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/hardware/gic.h> | |
28 | #include <asm/smp_scu.h> | |
29 | #include <asm/smp_plat.h> | |
30 | ||
31 | #include "core.h" | |
32 | ||
33 | extern void __iomem *sys_manager_base_addr; | |
34 | extern void __iomem *rst_manager_base_addr; | |
35 | ||
36 | static void __cpuinit socfpga_secondary_init(unsigned int cpu) | |
37 | { | |
38 | /* | |
39 | * if any interrupts are already enabled for the primary | |
40 | * core (e.g. timer irq), then they will not have been enabled | |
41 | * for us: do so | |
42 | */ | |
43 | gic_secondary_init(0); | |
44 | } | |
45 | ||
46 | static int __cpuinit socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle) | |
47 | { | |
48 | int trampoline_size = &secondary_trampoline_end - &secondary_trampoline; | |
49 | ||
50 | memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size); | |
51 | ||
52 | __raw_writel(virt_to_phys(secondary_startup), (sys_manager_base_addr+0x10)); | |
53 | ||
54 | flush_cache_all(); | |
55 | smp_wmb(); | |
56 | outer_clean_range(0, trampoline_size); | |
57 | ||
58 | /* This will release CPU #1 out of reset.*/ | |
59 | __raw_writel(0, rst_manager_base_addr + 0x10); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | /* | |
65 | * Initialise the CPU possible map early - this describes the CPUs | |
66 | * which may be present or become present in the system. | |
67 | */ | |
68 | static void __init socfpga_smp_init_cpus(void) | |
69 | { | |
70 | unsigned int i, ncores; | |
71 | ||
72 | ncores = scu_get_core_count(socfpga_scu_base_addr); | |
73 | ||
74 | for (i = 0; i < ncores; i++) | |
75 | set_cpu_possible(i, true); | |
76 | ||
77 | /* sanity check */ | |
78 | if (ncores > num_possible_cpus()) { | |
79 | pr_warn("socfpga: no. of cores (%d) greater than configured" | |
80 | "maximum of %d - clipping\n", ncores, num_possible_cpus()); | |
81 | ncores = num_possible_cpus(); | |
82 | } | |
83 | ||
84 | for (i = 0; i < ncores; i++) | |
85 | set_cpu_possible(i, true); | |
86 | ||
87 | set_smp_cross_call(gic_raise_softirq); | |
88 | } | |
89 | ||
90 | static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus) | |
91 | { | |
92 | scu_enable(socfpga_scu_base_addr); | |
93 | } | |
94 | ||
95 | /* | |
96 | * platform-specific code to shutdown a CPU | |
97 | * | |
98 | * Called with IRQs disabled | |
99 | */ | |
100 | static void socfpga_cpu_die(unsigned int cpu) | |
101 | { | |
102 | cpu_do_idle(); | |
103 | ||
104 | /* We should have never returned from idle */ | |
105 | panic("cpu %d unexpectedly exit from shutdown\n", cpu); | |
106 | } | |
107 | ||
108 | struct smp_operations socfpga_smp_ops __initdata = { | |
109 | .smp_init_cpus = socfpga_smp_init_cpus, | |
110 | .smp_prepare_cpus = socfpga_smp_prepare_cpus, | |
111 | .smp_secondary_init = socfpga_secondary_init, | |
112 | .smp_boot_secondary = socfpga_boot_secondary, | |
113 | #ifdef CONFIG_HOTPLUG_CPU | |
114 | .cpu_die = socfpga_cpu_die, | |
115 | #endif | |
116 | }; |