| Magnus Damm | 687c27b | 2013-10-01 17:13:16 +0900 | [diff] [blame] | 1 | /* |
| 2 | * SMP support for r8a7791 |
| 3 | * |
| 4 | * Copyright (C) 2013 Renesas Solutions Corp. |
| 5 | * Copyright (C) 2013 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/io.h> |
| 20 | #include <asm/smp_plat.h> |
| 21 | #include <mach/common.h> |
| 22 | #include <mach/r8a7791.h> |
| 23 | |
| 24 | #define RST 0xe6160000 |
| 25 | #define CA15BAR 0x0020 |
| 26 | #define CA15RESCNT 0x0040 |
| 27 | #define RAM 0xe6300000 |
| 28 | |
| 29 | static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus) |
| 30 | { |
| 31 | void __iomem *p; |
| 32 | u32 bar; |
| 33 | |
| 34 | /* let APMU code install data related to shmobile_boot_vector */ |
| 35 | shmobile_smp_apmu_prepare_cpus(max_cpus); |
| 36 | |
| 37 | /* RAM for jump stub, because BAR requires 256KB aligned address */ |
| 38 | p = ioremap_nocache(RAM, shmobile_boot_size); |
| 39 | memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size); |
| 40 | iounmap(p); |
| 41 | |
| 42 | /* setup reset vectors */ |
| 43 | p = ioremap_nocache(RST, 0x63); |
| 44 | bar = (RAM >> 8) & 0xfffffc00; |
| 45 | writel_relaxed(bar, p + CA15BAR); |
| 46 | writel_relaxed(bar | 0x10, p + CA15BAR); |
| 47 | |
| 48 | /* enable clocks to all CPUs */ |
| 49 | writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) | 0xa5a50000, |
| 50 | p + CA15RESCNT); |
| 51 | iounmap(p); |
| 52 | } |
| 53 | |
| 54 | struct smp_operations r8a7791_smp_ops __initdata = { |
| 55 | .smp_prepare_cpus = r8a7791_smp_prepare_cpus, |
| 56 | .smp_boot_secondary = shmobile_smp_apmu_boot_secondary, |
| 57 | #ifdef CONFIG_HOTPLUG_CPU |
| 58 | .cpu_disable = shmobile_smp_cpu_disable, |
| 59 | .cpu_die = shmobile_smp_apmu_cpu_die, |
| 60 | .cpu_kill = shmobile_smp_apmu_cpu_kill, |
| 61 | #endif |
| 62 | }; |