2 * Copyright (C) 2002 ARM Ltd.
3 * Copyright (C) 2008 STMicroelctronics.
4 * Copyright (C) 2009 ST-Ericsson.
5 * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
7 * This file is based on arm realview platform
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/init.h>
14 #include <linux/errno.h>
15 #include <linux/delay.h>
16 #include <linux/device.h>
17 #include <linux/smp.h>
20 #include <linux/of_address.h>
22 #include <asm/cacheflush.h>
23 #include <asm/smp_plat.h>
24 #include <asm/smp_scu.h>
28 #include "db8500-regs.h"
31 /* Magic triggers in backup RAM */
32 #define UX500_CPU1_JUMPADDR_OFFSET 0x1FF4
33 #define UX500_CPU1_WAKEMAGIC_OFFSET 0x1FF0
35 static void wakeup_secondary(void)
37 struct device_node
*np
;
38 static void __iomem
*backupram
;
40 np
= of_find_compatible_node(NULL
, NULL
, "ste,dbx500-backupram");
42 pr_err("No backupram base address\n");
45 backupram
= of_iomap(np
, 0);
48 pr_err("No backupram remap\n");
53 * write the address of secondary startup into the backup ram register
54 * at offset 0x1FF4, then write the magic number 0xA1FEED01 to the
55 * backup ram register at offset 0x1FF0, which is what boot rom code
56 * is waiting for. This will wake up the secondary core from WFE.
58 writel(virt_to_phys(secondary_startup
),
59 backupram
+ UX500_CPU1_JUMPADDR_OFFSET
);
61 backupram
+ UX500_CPU1_WAKEMAGIC_OFFSET
);
63 /* make sure write buffer is drained */
68 static void __init
ux500_smp_prepare_cpus(unsigned int max_cpus
)
70 struct device_node
*np
;
71 static void __iomem
*scu_base
;
75 np
= of_find_compatible_node(NULL
, NULL
, "arm,cortex-a9-scu");
77 pr_err("No SCU base address\n");
80 scu_base
= of_iomap(np
, 0);
83 pr_err("No SCU remap\n");
88 ncores
= scu_get_core_count(scu_base
);
89 for (i
= 0; i
< ncores
; i
++)
90 set_cpu_possible(i
, true);
94 static int ux500_boot_secondary(unsigned int cpu
, struct task_struct
*idle
)
97 arch_send_wakeup_ipi_mask(cpumask_of(cpu
));
101 struct smp_operations ux500_smp_ops __initdata
= {
102 .smp_prepare_cpus
= ux500_smp_prepare_cpus
,
103 .smp_boot_secondary
= ux500_boot_secondary
,
104 #ifdef CONFIG_HOTPLUG_CPU
105 .cpu_die
= ux500_cpu_die
,
108 CPU_METHOD_OF_DECLARE(ux500_smp
, "ste,dbx500-smp", &ux500_smp_ops
);