| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/smp.h> |
| 19 | #include <linux/spinlock.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <asm/smp_plat.h> |
| 23 | #include <asm/smp_scu.h> |
| 24 | |
| 25 | #include "common.h" |
| 26 | #include "emev2.h" |
| 27 | |
| 28 | #define EMEV2_SCU_BASE 0x1e000000 |
| 29 | #define EMEV2_SMU_BASE 0xe0110000 |
| 30 | #define SMU_GENERAL_REG0 0x7c0 |
| 31 | |
| 32 | static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle) |
| 33 | { |
| 34 | arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu))); |
| 35 | return 0; |
| 36 | } |
| 37 | |
| 38 | static void __init emev2_smp_prepare_cpus(unsigned int max_cpus) |
| 39 | { |
| 40 | void __iomem *smu; |
| 41 | |
| 42 | /* Tell ROM loader about our vector (in headsmp.S) */ |
| 43 | smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE); |
| 44 | if (smu) { |
| 45 | iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0); |
| 46 | iounmap(smu); |
| 47 | } |
| 48 | |
| 49 | /* setup EMEV2 specific SCU bits */ |
| 50 | shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus); |
| 51 | } |
| 52 | |
| 53 | const struct smp_operations emev2_smp_ops __initconst = { |
| 54 | .smp_prepare_cpus = emev2_smp_prepare_cpus, |
| 55 | .smp_boot_secondary = emev2_boot_secondary, |
| 56 | }; |