1 | // SPDX-License-Identifier: GPL-2.0 |
---|---|
2 | /* |
3 | * SMP support for Emma Mobile EV2 |
4 | * |
5 | * Copyright (C) 2012 Renesas Solutions Corp. |
6 | * Copyright (C) 2012 Magnus Damm |
7 | */ |
8 | #include <linux/kernel.h> |
9 | #include <linux/init.h> |
10 | #include <linux/smp.h> |
11 | #include <linux/spinlock.h> |
12 | #include <linux/io.h> |
13 | #include <linux/delay.h> |
14 | #include <asm/smp_plat.h> |
15 | #include <asm/smp_scu.h> |
16 | |
17 | #include "common.h" |
18 | #include "emev2.h" |
19 | |
20 | #define EMEV2_SCU_BASE 0x1e000000 |
21 | #define EMEV2_SMU_BASE 0xe0110000 |
22 | #define SMU_GENERAL_REG0 0x7c0 |
23 | |
24 | static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) |
25 | { |
26 | arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); |
27 | return 0; |
28 | } |
29 | |
30 | static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) |
31 | { |
32 | void __iomem *smu; |
33 | |
34 | /* Tell ROM loader about our vector (in headsmp.S) */ |
35 | smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE); |
36 | if (smu) { |
37 | iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0); |
38 | iounmap(addr: smu); |
39 | } |
40 | |
41 | /* setup EMEV2 specific SCU bits */ |
42 | shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus); |
43 | } |
44 | |
45 | const struct smp_operations emev2_smp_ops __initconst = { |
46 | .smp_prepare_cpus = emev2_smp_prepare_cpus, |
47 | .smp_boot_secondary = emev2_boot_secondary, |
48 | }; |
49 |