| | 1 | /* |
| | 2 | * linux/arch/arm/mach-realview/platsmp.c |
| | 3 | * |
| | 4 | * Copyright (C) 2002 ARM Ltd. |
| | 5 | * All Rights Reserved |
| | 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 version 2 as |
| | 9 | * published by the Free Software Foundation. |
| | 10 | */ |
| | 11 | #include <linux/init.h> |
| | 12 | #include <linux/errno.h> |
| | 13 | #include <linux/smp.h> |
| | 14 | #include <linux/io.h> |
| | 15 | |
| | 16 | #include "hardware.h" |
| | 17 | #include <asm/mach-types.h> |
| | 18 | #include <asm/smp_scu.h> |
| | 19 | |
| | 20 | #include "board-eb.h" |
| | 21 | #include "board-pb11mp.h" |
| | 22 | #include "board-pbx.h" |
| | 23 | |
| | 24 | #include <plat/platsmp.h> |
| | 25 | |
| | 26 | #include "core.h" |
| | 27 | |
| | 28 | static void __iomem *scu_base_addr(void) |
| | 29 | { |
| | 30 | if (machine_is_realview_eb_mp()) |
| | 31 | return __io_address(REALVIEW_EB11MP_SCU_BASE); |
| | 32 | else if (machine_is_realview_pb11mp()) |
| | 33 | return __io_address(REALVIEW_TC11MP_SCU_BASE); |
| | 34 | else if (machine_is_realview_pbx() && |
| | 35 | (core_tile_pbx11mp() || core_tile_pbxa9mp())) |
| | 36 | return __io_address(REALVIEW_PBX_TILE_SCU_BASE); |
| | 37 | else |
| | 38 | return (void __iomem *)0; |
| | 39 | } |
| | 40 | |
| | 41 | /* |
| | 42 | * Initialise the CPU possible map early - this describes the CPUs |
| | 43 | * which may be present or become present in the system. |
| | 44 | */ |
| | 45 | static void __init realview_smp_init_cpus(void) |
| | 46 | { |
| | 47 | void __iomem *scu_base = scu_base_addr(); |
| | 48 | unsigned int i, ncores; |
| | 49 | |
| | 50 | ncores = scu_base ? scu_get_core_count(scu_base) : 1; |
| | 51 | |
| | 52 | /* sanity check */ |
| | 53 | if (ncores > nr_cpu_ids) { |
| | 54 | pr_warn("SMP: %u cores greater than maximum (%u), clipping\n", |
| | 55 | ncores, nr_cpu_ids); |
| | 56 | ncores = nr_cpu_ids; |
| | 57 | } |
| | 58 | |
| | 59 | for (i = 0; i < ncores; i++) |
| | 60 | set_cpu_possible(i, true); |
| | 61 | } |
| | 62 | |
| | 63 | static void __init realview_smp_prepare_cpus(unsigned int max_cpus) |
| | 64 | { |
| | 65 | |
| | 66 | scu_enable(scu_base_addr()); |
| | 67 | |
| | 68 | /* |
| | 69 | * Write the address of secondary startup into the |
| | 70 | * system-wide flags register. The BootMonitor waits |
| | 71 | * until it receives a soft interrupt, and then the |
| | 72 | * secondary CPU branches to this address. |
| | 73 | */ |
| | 74 | __raw_writel(virt_to_phys(versatile_secondary_startup), |
| | 75 | __io_address(REALVIEW_SYS_FLAGSSET)); |
| | 76 | } |
| | 77 | |
| | 78 | const struct smp_operations realview_smp_ops __initconst = { |
| | 79 | .smp_init_cpus = realview_smp_init_cpus, |
| | 80 | .smp_prepare_cpus = realview_smp_prepare_cpus, |
| | 81 | .smp_secondary_init = versatile_secondary_init, |
| | 82 | .smp_boot_secondary = versatile_boot_secondary, |
| | 83 | #ifdef CONFIG_HOTPLUG_CPU |
| | 84 | .cpu_die = realview_cpu_die, |
| | 85 | #endif |
| | 86 | }; |
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