/* * linux/arch/arm/mach-realview/platsmp.c * * Copyright (C) 2002 ARM Ltd. * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/init.h> #include <linux/errno.h> #include <linux/smp.h> #include <linux/io.h> #include <mach/hardware.h> #include <asm/hardware/gic.h> #include <asm/mach-types.h> #include <asm/smp_scu.h> #include <asm/unified.h> #include <mach/board-eb.h> #include <mach/board-pb11mp.h> #include <mach/board-pbx.h> #include "core.h" extern void versatile_secondary_startup(void); static void __iomem *scu_base_addr(void) { if (machine_is_realview_eb_mp()) return __io_address(REALVIEW_EB11MP_SCU_BASE); else if (machine_is_realview_pb11mp()) return __io_address(REALVIEW_TC11MP_SCU_BASE); else if (machine_is_realview_pbx() && (core_tile_pbx11mp() || core_tile_pbxa9mp())) return __io_address(REALVIEW_PBX_TILE_SCU_BASE); else return (void __iomem *)0; } /* * Initialise the CPU possible map early - this describes the CPUs * which may be present or become present in the system. */ void __init smp_init_cpus(void) { void __iomem *scu_base = scu_base_addr(); unsigned int i, ncores; ncores = scu_base ? scu_get_core_count(scu_base) : 1; /* sanity check */ if (ncores > NR_CPUS) { printk(KERN_WARNING "Realview: no. of cores (%d) greater than configured " "maximum of %d - clipping\n", ncores, NR_CPUS); ncores = NR_CPUS; } for (i = 0; i < ncores; i++) set_cpu_possible(i, true); set_smp_cross_call(gic_raise_softirq); } void __init platform_smp_prepare_cpus(unsigned int max_cpus) { scu_enable(scu_base_addr()); /* * Write the address of secondary startup into the * system-wide flags register. The BootMonitor waits * until it receives a soft interrupt, and then the * secondary CPU branches to this address. */ __raw_writel(BSYM(virt_to_phys(versatile_secondary_startup)), __io_address(REALVIEW_SYS_FLAGSSET)); }