blob: 689fbbc3d9c8860347f42f60c00c01f41c0a091a [file] [log] [blame]
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
42 if (cpu > ncores) {
43 pr_warn("CPU No. is not available in the system\n");
44 return -1;
45 }
46
47 /* MS: Expectation that SLCR are directly map and accessible */
48 /* Not possible to jump to non aligned address */
49 if (!(address & 3) && (!address || (address >= trampoline_code_size))) {
50 /* Store pointer to ioremap area which points to address 0x0 */
51 static u8 __iomem *zero;
52 u32 trampoline_size = &zynq_secondary_trampoline_jump -
53 &zynq_secondary_trampoline;
54
55 zynq_slcr_cpu_stop(cpu);
Michal Simek88cd4e82013-05-24 17:58:55 +020056 if (address) {
57 if (__pa(PAGE_OFFSET)) {
58 zero = ioremap(0, trampoline_code_size);
59 if (!zero) {
60 pr_warn("BOOTUP jump vectors not accessible\n");
61 return -1;
62 }
63 } else {
64 zero = (__force u8 __iomem *)PAGE_OFFSET;
Michal Simekaa7eb2b2013-03-20 13:50:12 +010065 }
Michal Simek88cd4e82013-05-24 17:58:55 +020066
67 /*
68 * This is elegant way how to jump to any address
69 * 0x0: Load address at 0x8 to r0
70 * 0x4: Jump by mov instruction
71 * 0x8: Jumping address
72 */
73 memcpy((__force void *)zero, &zynq_secondary_trampoline,
74 trampoline_size);
75 writel(address, zero + trampoline_size);
76
77 flush_cache_all();
78 outer_flush_range(0, trampoline_code_size);
79 smp_wmb();
80
81 if (__pa(PAGE_OFFSET))
82 iounmap(zero);
Michal Simekaa7eb2b2013-03-20 13:50:12 +010083 }
Michal Simekaa7eb2b2013-03-20 13:50:12 +010084 zynq_slcr_cpu_start(cpu);
85
86 return 0;
87 }
88
89 pr_warn("Can't start CPU%d: Wrong starting address %x\n", cpu, address);
90
91 return -1;
92}
93EXPORT_SYMBOL(zynq_cpun_start);
94
Paul Gortmaker8bd26e32013-06-17 15:43:14 -040095static int zynq_boot_secondary(unsigned int cpu,
Michal Simekaa7eb2b2013-03-20 13:50:12 +010096 struct task_struct *idle)
97{
98 return zynq_cpun_start(virt_to_phys(secondary_startup), cpu);
99}
100
101/*
102 * Initialise the CPU possible map early - this describes the CPUs
103 * which may be present or become present in the system.
104 */
105static void __init zynq_smp_init_cpus(void)
106{
107 int i;
108
109 ncores = scu_get_core_count(zynq_scu_base);
110
111 for (i = 0; i < ncores && i < CONFIG_NR_CPUS; i++)
112 set_cpu_possible(i, true);
113}
114
115static void __init zynq_smp_prepare_cpus(unsigned int max_cpus)
116{
117 int i;
118
119 /*
120 * Initialise the present map, which describes the set of CPUs
121 * actually populated at the present time.
122 */
123 for (i = 0; i < max_cpus; i++)
124 set_cpu_present(i, true);
125
126 scu_enable(zynq_scu_base);
127}
128
129struct smp_operations zynq_smp_ops __initdata = {
130 .smp_init_cpus = zynq_smp_init_cpus,
131 .smp_prepare_cpus = zynq_smp_prepare_cpus,
Michal Simekaa7eb2b2013-03-20 13:50:12 +0100132 .smp_boot_secondary = zynq_boot_secondary,
Michal Simekc7c28b02013-03-20 13:56:15 +0100133#ifdef CONFIG_HOTPLUG_CPU
134 .cpu_die = zynq_platform_cpu_die,
135#endif
Michal Simekaa7eb2b2013-03-20 13:50:12 +0100136};