projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 862184fe RK |
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> | |
| 862184fe | 13 | #include <linux/smp.h> |
| fced80c7 | 14 | #include <linux/io.h> |
| 862184fe | 15 | |
| 6d407a6e | 16 | #include "hardware.h" |
| 7dd19e75 | 17 | #include <asm/mach-types.h> |
| 0462b447 | 18 | #include <asm/smp_scu.h> |
| 862184fe | 19 | |
| 6d407a6e AB |
20 | #include "board-eb.h" |
| 21 | #include "board-pb11mp.h" | |
| 22 | #include "board-pbx.h" | |
| b7b0ba94 | 23 | |
| 3695adc2 | 24 | #include <plat/platsmp.h> |
| 1bbdf637 | 25 | |
| 3695adc2 | 26 | #include "core.h" |
| 3705ff6d | 27 | |
| 1bbdf637 CM |
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); | |
| 1b504bbe CT |
34 | else if (machine_is_realview_pbx() && |
| 35 | (core_tile_pbx11mp() || core_tile_pbxa9mp())) | |
| 36 | return __io_address(REALVIEW_PBX_TILE_SCU_BASE); | |
| 1bbdf637 CM |
37 | else |
| 38 | return (void __iomem *)0; | |
| 39 | } | |
| 40 | ||
| 7bbb7940 RK |
41 | /* |
| 42 | * Initialise the CPU possible map early - this describes the CPUs | |
| 43 | * which may be present or become present in the system. | |
| 44 | */ | |
| 3695adc2 | 45 | static void __init realview_smp_init_cpus(void) |
| 7bbb7940 | 46 | { |
| fd778f0a RK |
47 | void __iomem *scu_base = scu_base_addr(); |
| 48 | unsigned int i, ncores; | |
| 7bbb7940 | 49 | |
| fd778f0a | 50 | ncores = scu_base ? scu_get_core_count(scu_base) : 1; |
| 862184fe RK |
51 | |
| 52 | /* sanity check */ | |
| a06f916b RK |
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; | |
| 862184fe RK |
57 | } |
| 58 | ||
| bbc3d14e RK |
59 | for (i = 0; i < ncores; i++) |
| 60 | set_cpu_possible(i, true); | |
| 61 | } | |
| 862184fe | 62 | |
| 3695adc2 | 63 | static void __init realview_smp_prepare_cpus(unsigned int max_cpus) |
| bbc3d14e | 64 | { |
| 862184fe | 65 | |
| 05c74a6c RK |
66 | scu_enable(scu_base_addr()); |
| 67 | ||
| 862184fe | 68 | /* |
| 05c74a6c RK |
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. | |
| 862184fe | 73 | */ |
| 764a579f | 74 | __raw_writel(virt_to_phys(versatile_secondary_startup), |
| 05c74a6c | 75 | __io_address(REALVIEW_SYS_FLAGSSET)); |
| 862184fe | 76 | } |
| 3695adc2 | 77 | |
| 75305275 | 78 | const struct smp_operations realview_smp_ops __initconst = { |
| 3695adc2 MZ |
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 | }; |