projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 687c27b0 MD |
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> | |
| 687c27b0 | 21 | #include <mach/r8a7791.h> |
| 277efd30 | 22 | #include <mach/rcar-gen2.h> |
| fd44aa5e | 23 | #include "common.h" |
| 687c27b0 MD |
24 | |
| 25 | #define RST 0xe6160000 | |
| 26 | #define CA15BAR 0x0020 | |
| 27 | #define CA15RESCNT 0x0040 | |
| 28 | #define RAM 0xe6300000 | |
| 29 | ||
| 30 | static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus) | |
| 31 | { | |
| 32 | void __iomem *p; | |
| 33 | u32 bar; | |
| 34 | ||
| 35 | /* let APMU code install data related to shmobile_boot_vector */ | |
| 36 | shmobile_smp_apmu_prepare_cpus(max_cpus); | |
| 37 | ||
| 38 | /* RAM for jump stub, because BAR requires 256KB aligned address */ | |
| 39 | p = ioremap_nocache(RAM, shmobile_boot_size); | |
| 40 | memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size); | |
| 41 | iounmap(p); | |
| 42 | ||
| 43 | /* setup reset vectors */ | |
| 44 | p = ioremap_nocache(RST, 0x63); | |
| 45 | bar = (RAM >> 8) & 0xfffffc00; | |
| 46 | writel_relaxed(bar, p + CA15BAR); | |
| 47 | writel_relaxed(bar | 0x10, p + CA15BAR); | |
| 48 | ||
| 49 | /* enable clocks to all CPUs */ | |
| 50 | writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) | 0xa5a50000, | |
| 51 | p + CA15RESCNT); | |
| 52 | iounmap(p); | |
| 53 | } | |
| 54 | ||
| 277efd30 MD |
55 | static int r8a7791_smp_boot_secondary(unsigned int cpu, |
| 56 | struct task_struct *idle) | |
| 57 | { | |
| 58 | /* Error out when hardware debug mode is enabled */ | |
| 59 | if (rcar_gen2_read_mode_pins() & BIT(21)) { | |
| 60 | pr_warn("Unable to boot CPU%u when MD21 is set\n", cpu); | |
| 61 | return -ENOTSUPP; | |
| 62 | } | |
| 63 | ||
| 64 | return shmobile_smp_apmu_boot_secondary(cpu, idle); | |
| 65 | } | |
| 66 | ||
| 687c27b0 MD |
67 | struct smp_operations r8a7791_smp_ops __initdata = { |
| 68 | .smp_prepare_cpus = r8a7791_smp_prepare_cpus, | |
| 277efd30 | 69 | .smp_boot_secondary = r8a7791_smp_boot_secondary, |
| 687c27b0 MD |
70 | #ifdef CONFIG_HOTPLUG_CPU |
| 71 | .cpu_disable = shmobile_smp_cpu_disable, | |
| 72 | .cpu_die = shmobile_smp_apmu_cpu_die, | |
| 73 | .cpu_kill = shmobile_smp_apmu_cpu_kill, | |
| 74 | #endif | |
| 75 | }; |