projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 7b7dfdd2 AT |
1 | /* |
| 2 | * Copyright (C) 2014 Marvell Technology Group Ltd. | |
| 3 | * | |
| 4 | * Antoine Ténart <antoine.tenart@free-electrons.com> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/io.h> | |
| 12 | #include <linux/delay.h> | |
| 13 | #include <linux/of.h> | |
| 14 | #include <linux/of_address.h> | |
| 15 | ||
| 16 | #include <asm/cacheflush.h> | |
| 17 | #include <asm/smp_plat.h> | |
| 18 | #include <asm/smp_scu.h> | |
| 19 | ||
| 20 | #define CPU_RESET 0x00 | |
| 21 | ||
| 22 | #define RESET_VECT 0x00 | |
| 23 | #define SW_RESET_ADDR 0x94 | |
| 24 | ||
| 7b7dfdd2 AT |
25 | extern u32 boot_inst; |
| 26 | ||
| 27 | static void __iomem *cpu_ctrl; | |
| 28 | ||
| 29 | static inline void berlin_perform_reset_cpu(unsigned int cpu) | |
| 30 | { | |
| 31 | u32 val; | |
| 32 | ||
| 33 | val = readl(cpu_ctrl + CPU_RESET); | |
| 34 | val |= BIT(cpu_logical_map(cpu)); | |
| 35 | writel(val, cpu_ctrl + CPU_RESET); | |
| 36 | } | |
| 37 | ||
| 38 | static int berlin_boot_secondary(unsigned int cpu, struct task_struct *idle) | |
| 39 | { | |
| 40 | if (!cpu_ctrl) | |
| 41 | return -EFAULT; | |
| 42 | ||
| 43 | /* | |
| 44 | * Reset the CPU, making it to execute the instruction in the reset | |
| 45 | * exception vector. | |
| 46 | */ | |
| 47 | berlin_perform_reset_cpu(cpu); | |
| 48 | ||
| 49 | return 0; | |
| 50 | } | |
| 51 | ||
| 52 | static void __init berlin_smp_prepare_cpus(unsigned int max_cpus) | |
| 53 | { | |
| 54 | struct device_node *np; | |
| 55 | void __iomem *scu_base; | |
| 56 | void __iomem *vectors_base; | |
| 57 | ||
| 58 | np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); | |
| 59 | scu_base = of_iomap(np, 0); | |
| 60 | of_node_put(np); | |
| 61 | if (!scu_base) | |
| 62 | return; | |
| 63 | ||
| 64 | np = of_find_compatible_node(NULL, NULL, "marvell,berlin-cpu-ctrl"); | |
| 65 | cpu_ctrl = of_iomap(np, 0); | |
| 66 | of_node_put(np); | |
| 67 | if (!cpu_ctrl) | |
| 68 | goto unmap_scu; | |
| 69 | ||
| 70 | vectors_base = ioremap(CONFIG_VECTORS_BASE, SZ_32K); | |
| 71 | if (!vectors_base) | |
| 72 | goto unmap_scu; | |
| 73 | ||
| 74 | scu_enable(scu_base); | |
| 75 | flush_cache_all(); | |
| 76 | ||
| 77 | /* | |
| 78 | * Write the first instruction the CPU will execute after being reset | |
| 79 | * in the reset exception vector. | |
| 80 | */ | |
| 81 | writel(boot_inst, vectors_base + RESET_VECT); | |
| 82 | ||
| 83 | /* | |
| 84 | * Write the secondary startup address into the SW reset address | |
| 85 | * vector. This is used by boot_inst. | |
| 86 | */ | |
| 02b4e275 | 87 | writel(virt_to_phys(secondary_startup), vectors_base + SW_RESET_ADDR); |
| 7b7dfdd2 AT |
88 | |
| 89 | iounmap(vectors_base); | |
| 90 | unmap_scu: | |
| 91 | iounmap(scu_base); | |
| 92 | } | |
| 93 | ||
| 94 | static struct smp_operations berlin_smp_ops __initdata = { | |
| 95 | .smp_prepare_cpus = berlin_smp_prepare_cpus, | |
| 96 | .smp_boot_secondary = berlin_boot_secondary, | |
| 97 | }; | |
| 98 | CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops); |