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bd5a875d MD |
1 | /* |
2 | * SMP support for Emma Mobile EV2 | |
3 | * | |
4 | * Copyright (C) 2012 Renesas Solutions Corp. | |
5 | * Copyright (C) 2012 Magnus Damm | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/delay.h> | |
26 | #include <mach/common.h> | |
27 | #include <mach/emev2.h> | |
28 | #include <asm/smp_plat.h> | |
29 | #include <asm/smp_scu.h> | |
bd5a875d MD |
30 | |
31 | #define EMEV2_SCU_BASE 0x1e000000 | |
8d7217e5 MD |
32 | #define EMEV2_SMU_BASE 0xe0110000 |
33 | #define SMU_GENERAL_REG0 0x7c0 | |
bd5a875d | 34 | |
a62580e5 | 35 | static int __cpuinit emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) |
bd5a875d | 36 | { |
1af4b3fa | 37 | arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); |
bd5a875d MD |
38 | return 0; |
39 | } | |
40 | ||
a62580e5 | 41 | static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) |
bd5a875d | 42 | { |
8d7217e5 MD |
43 | void __iomem *smu; |
44 | ||
683101a6 MD |
45 | /* setup EMEV2 specific SCU base, enable */ |
46 | shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE); | |
d8a28ed1 | 47 | scu_enable(shmobile_scu_base); |
bd5a875d | 48 | |
a188bfca | 49 | /* Tell ROM loader about our vector (in headsmp-scu.S, headsmp.S) */ |
8d7217e5 MD |
50 | smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE); |
51 | if (smu) { | |
52 | iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0); | |
53 | iounmap(smu); | |
54 | } | |
a188bfca MD |
55 | shmobile_boot_fn = virt_to_phys(shmobile_boot_scu); |
56 | shmobile_boot_arg = (unsigned long)shmobile_scu_base; | |
da252b8e | 57 | |
1af4b3fa MD |
58 | /* enable cache coherency on booting CPU */ |
59 | scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL); | |
bd5a875d | 60 | } |
a62580e5 | 61 | |
a62580e5 | 62 | struct smp_operations emev2_smp_ops __initdata = { |
a62580e5 | 63 | .smp_prepare_cpus = emev2_smp_prepare_cpus, |
a62580e5 | 64 | .smp_boot_secondary = emev2_boot_secondary, |
a62580e5 | 65 | }; |