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Commit | Line | Data |
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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 | }; |