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Michal Simekaa7eb2b2013-03-20 13:50:12 +01001/*
2 * This file contains Xilinx specific SMP code, used to start up
3 * the second processor.
4 *
5 * Copyright (C) 2011-2013 Xilinx
6 *
7 * based on linux/arch/arm/mach-realview/platsmp.c
8 *
9 * Copyright (C) 2002 ARM Ltd.
10 *
11 * This software is licensed under the terms of the GNU General Public
12 * License version 2, as published by the Free Software Foundation, and
13 * may be copied, distributed, and modified under those terms.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
20
21#include <linux/export.h>
22#include <linux/jiffies.h>
23#include <linux/init.h>
24#include <linux/io.h>
25#include <asm/cacheflush.h>
26#include <asm/smp_scu.h>
27#include <linux/irqchip/arm-gic.h>
28#include "common.h"
29
30/*
31 * Store number of cores in the system
32 * Because of scu_get_core_count() must be in __init section and can't
Paul Gortmaker8bd26e32013-06-17 15:43:14 -040033 * be called from zynq_cpun_start() because it is not in __init section.
Michal Simekaa7eb2b2013-03-20 13:50:12 +010034 */
35static int ncores;
36
Paul Gortmaker8bd26e32013-06-17 15:43:14 -040037int zynq_cpun_start(u32 address, int cpu)
Michal Simekaa7eb2b2013-03-20 13:50:12 +010038{
39 u32 trampoline_code_size = &zynq_secondary_trampoline_end -
40 &zynq_secondary_trampoline;
41
Michal Simekaa7eb2b2013-03-20 13:50:12 +010042 /* MS: Expectation that SLCR are directly map and accessible */
43 /* Not possible to jump to non aligned address */
44 if (!(address & 3) && (!address || (address >= trampoline_code_size))) {
45 /* Store pointer to ioremap area which points to address 0x0 */
46 static u8 __iomem *zero;
47 u32 trampoline_size = &zynq_secondary_trampoline_jump -
48 &zynq_secondary_trampoline;
49
50 zynq_slcr_cpu_stop(cpu);
Michal Simek88cd4e82013-05-24 17:58:55 +020051 if (address) {
52 if (__pa(PAGE_OFFSET)) {
53 zero = ioremap(0, trampoline_code_size);
54 if (!zero) {
55 pr_warn("BOOTUP jump vectors not accessible\n");
56 return -1;
57 }
58 } else {
59 zero = (__force u8 __iomem *)PAGE_OFFSET;
Michal Simekaa7eb2b2013-03-20 13:50:12 +010060 }
Michal Simek88cd4e82013-05-24 17:58:55 +020061
62 /*
63 * This is elegant way how to jump to any address
64 * 0x0: Load address at 0x8 to r0
65 * 0x4: Jump by mov instruction
66 * 0x8: Jumping address
67 */
68 memcpy((__force void *)zero, &zynq_secondary_trampoline,
69 trampoline_size);
70 writel(address, zero + trampoline_size);
71
72 flush_cache_all();
73 outer_flush_range(0, trampoline_code_size);
74 smp_wmb();
75
76 if (__pa(PAGE_OFFSET))
77 iounmap(zero);
Michal Simekaa7eb2b2013-03-20 13:50:12 +010078 }
Michal Simekaa7eb2b2013-03-20 13:50:12 +010079 zynq_slcr_cpu_start(cpu);
80
81 return 0;
82 }
83
84 pr_warn("Can't start CPU%d: Wrong starting address %x\n", cpu, address);
85
86 return -1;
87}
88EXPORT_SYMBOL(zynq_cpun_start);
89
Russell King02b4e272015-05-19 17:06:44 +010090static int zynq_boot_secondary(unsigned int cpu, struct task_struct *idle)
Michal Simekaa7eb2b2013-03-20 13:50:12 +010091{
Russell King02b4e272015-05-19 17:06:44 +010092 return zynq_cpun_start(virt_to_phys(secondary_startup), cpu);
Michal Simekaa7eb2b2013-03-20 13:50:12 +010093}
94
95/*
96 * Initialise the CPU possible map early - this describes the CPUs
97 * which may be present or become present in the system.
98 */
99static void __init zynq_smp_init_cpus(void)
100{
101 int i;
102
103 ncores = scu_get_core_count(zynq_scu_base);
104
105 for (i = 0; i < ncores && i < CONFIG_NR_CPUS; i++)
106 set_cpu_possible(i, true);
107}
108
109static void __init zynq_smp_prepare_cpus(unsigned int max_cpus)
110{
Michal Simekaa7eb2b2013-03-20 13:50:12 +0100111 scu_enable(zynq_scu_base);
112}
113
Soren Brinkmannae88b852014-09-02 14:19:06 -0700114/**
115 * zynq_secondary_init - Initialize secondary CPU cores
116 * @cpu: CPU that is initialized
117 *
118 * This function is in the hotplug path. Don't move it into the
119 * init section!!
120 */
121static void zynq_secondary_init(unsigned int cpu)
122{
123 zynq_core_pm_init();
124}
125
Michal Simekf1fd2fa2013-10-31 09:10:16 -0700126#ifdef CONFIG_HOTPLUG_CPU
127static int zynq_cpu_kill(unsigned cpu)
128{
Soren Brinkmann50c79602014-09-02 14:19:12 -0700129 unsigned long timeout = jiffies + msecs_to_jiffies(50);
130
131 while (zynq_slcr_cpu_state_read(cpu))
132 if (time_after(jiffies, timeout))
133 return 0;
134
Michal Simekf1fd2fa2013-10-31 09:10:16 -0700135 zynq_slcr_cpu_stop(cpu);
136 return 1;
137}
Soren Brinkmanncaf86a72014-09-02 14:19:13 -0700138
Soren Brinkmanned62e332014-09-02 14:19:14 -0700139/**
140 * zynq_cpu_die - Let a CPU core die
141 * @cpu: Dying CPU
Soren Brinkmanncaf86a72014-09-02 14:19:13 -0700142 *
Soren Brinkmanned62e332014-09-02 14:19:14 -0700143 * Platform-specific code to shutdown a CPU.
144 * Called with IRQs disabled on the dying CPU.
Soren Brinkmanncaf86a72014-09-02 14:19:13 -0700145 */
Soren Brinkmanned62e332014-09-02 14:19:14 -0700146static void zynq_cpu_die(unsigned int cpu)
Soren Brinkmanncaf86a72014-09-02 14:19:13 -0700147{
148 zynq_slcr_cpu_state_write(cpu, true);
149
150 /*
151 * there is no power-control hardware on this platform, so all
152 * we can do is put the core into WFI; this is safe as the calling
153 * code will have already disabled interrupts
154 */
155 for (;;)
156 cpu_do_idle();
157}
Michal Simekf1fd2fa2013-10-31 09:10:16 -0700158#endif
159
Michal Simekaa7eb2b2013-03-20 13:50:12 +0100160struct smp_operations zynq_smp_ops __initdata = {
161 .smp_init_cpus = zynq_smp_init_cpus,
162 .smp_prepare_cpus = zynq_smp_prepare_cpus,
Michal Simekaa7eb2b2013-03-20 13:50:12 +0100163 .smp_boot_secondary = zynq_boot_secondary,
Soren Brinkmannae88b852014-09-02 14:19:06 -0700164 .smp_secondary_init = zynq_secondary_init,
Michal Simekc7c28b02013-03-20 13:56:15 +0100165#ifdef CONFIG_HOTPLUG_CPU
Soren Brinkmanned62e332014-09-02 14:19:14 -0700166 .cpu_die = zynq_cpu_die,
Michal Simekf1fd2fa2013-10-31 09:10:16 -0700167 .cpu_kill = zynq_cpu_kill,
Michal Simekc7c28b02013-03-20 13:56:15 +0100168#endif
Michal Simekaa7eb2b2013-03-20 13:50:12 +0100169};