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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2010-2011 Calxeda, Inc.
4 * Copyright 2012 Pavel Machek <pavel@denx.de>
5 * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
6 * Copyright (C) 2012 Altera Corporation
7 */
8#include <linux/delay.h>
9#include <linux/init.h>
10#include <linux/smp.h>
11#include <linux/io.h>
12#include <linux/of.h>
13#include <linux/of_address.h>
14
15#include <asm/cacheflush.h>
16#include <asm/smp_scu.h>
17#include <asm/smp_plat.h>
18
19#include "core.h"
20
21static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
22{
23 int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
24
25 if (socfpga_cpu1start_addr) {
26 /* This will put CPU #1 into reset. */
27 writel(RSTMGR_MPUMODRST_CPU1,
28 rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
29
30 memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
31
32 writel(__pa_symbol(secondary_startup),
33 sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff));
34
35 flush_cache_all();
36 smp_wmb();
37 outer_clean_range(0, trampoline_size);
38
39 /* This will release CPU #1 out of reset. */
40 writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
41 }
42
43 return 0;
44}
45
46static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle)
47{
48 int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
49
50 if (socfpga_cpu1start_addr) {
51 writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr +
52 SOCFPGA_A10_RSTMGR_MODMPURST);
53 memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
54
55 writel(__pa_symbol(secondary_startup),
56 sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
57
58 flush_cache_all();
59 smp_wmb();
60 outer_clean_range(0, trampoline_size);
61
62 /* This will release CPU #1 out of reset. */
63 writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST);
64 }
65
66 return 0;
67}
68
69static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
70{
71 struct device_node *np;
72 void __iomem *socfpga_scu_base_addr;
73
74 np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
75 if (!np) {
76 pr_err("%s: missing scu\n", __func__);
77 return;
78 }
79
80 socfpga_scu_base_addr = of_iomap(np, 0);
81 if (!socfpga_scu_base_addr)
82 return;
83 scu_enable(socfpga_scu_base_addr);
84}
85
86#ifdef CONFIG_HOTPLUG_CPU
87/*
88 * platform-specific code to shutdown a CPU
89 *
90 * Called with IRQs disabled
91 */
92static void socfpga_cpu_die(unsigned int cpu)
93{
94 /* Do WFI. If we wake up early, go back into WFI */
95 while (1)
96 cpu_do_idle();
97}
98
99/*
100 * We need a dummy function so that platform_can_cpu_hotplug() knows
101 * we support CPU hotplug. However, the function does not need to do
102 * anything, because CPUs going offline just do WFI. We could reset
103 * the CPUs but it would increase power consumption.
104 */
105static int socfpga_cpu_kill(unsigned int cpu)
106{
107 return 1;
108}
109#endif
110
111static const struct smp_operations socfpga_smp_ops __initconst = {
112 .smp_prepare_cpus = socfpga_smp_prepare_cpus,
113 .smp_boot_secondary = socfpga_boot_secondary,
114#ifdef CONFIG_HOTPLUG_CPU
115 .cpu_die = socfpga_cpu_die,
116 .cpu_kill = socfpga_cpu_kill,
117#endif
118};
119
120static const struct smp_operations socfpga_a10_smp_ops __initconst = {
121 .smp_prepare_cpus = socfpga_smp_prepare_cpus,
122 .smp_boot_secondary = socfpga_a10_boot_secondary,
123#ifdef CONFIG_HOTPLUG_CPU
124 .cpu_die = socfpga_cpu_die,
125 .cpu_kill = socfpga_cpu_kill,
126#endif
127};
128
129CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops);
130CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops);
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
32static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
33{
34 int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
35
36 if (cpu1start_addr) {
37 memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
38
39 __raw_writel(virt_to_phys(socfpga_secondary_startup),
40 (sys_manager_base_addr + (cpu1start_addr & 0x000000ff)));
41
42 flush_cache_all();
43 smp_wmb();
44 outer_clean_range(0, trampoline_size);
45
46 /* This will release CPU #1 out of reset.*/
47 __raw_writel(0, rst_manager_base_addr + 0x10);
48 }
49
50 return 0;
51}
52
53/*
54 * Initialise the CPU possible map early - this describes the CPUs
55 * which may be present or become present in the system.
56 */
57static void __init socfpga_smp_init_cpus(void)
58{
59 unsigned int i, ncores;
60
61 ncores = scu_get_core_count(socfpga_scu_base_addr);
62
63 for (i = 0; i < ncores; i++)
64 set_cpu_possible(i, true);
65
66 /* sanity check */
67 if (ncores > num_possible_cpus()) {
68 pr_warn("socfpga: no. of cores (%d) greater than configured"
69 "maximum of %d - clipping\n", ncores, num_possible_cpus());
70 ncores = num_possible_cpus();
71 }
72
73 for (i = 0; i < ncores; i++)
74 set_cpu_possible(i, true);
75}
76
77static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
78{
79 scu_enable(socfpga_scu_base_addr);
80}
81
82/*
83 * platform-specific code to shutdown a CPU
84 *
85 * Called with IRQs disabled
86 */
87static void socfpga_cpu_die(unsigned int cpu)
88{
89 cpu_do_idle();
90
91 /* We should have never returned from idle */
92 panic("cpu %d unexpectedly exit from shutdown\n", cpu);
93}
94
95struct smp_operations socfpga_smp_ops __initdata = {
96 .smp_init_cpus = socfpga_smp_init_cpus,
97 .smp_prepare_cpus = socfpga_smp_prepare_cpus,
98 .smp_boot_secondary = socfpga_boot_secondary,
99#ifdef CONFIG_HOTPLUG_CPU
100 .cpu_die = socfpga_cpu_die,
101#endif
102};