diff options
Diffstat (limited to 'arch/arm/mach-realview/platsmp.c')
-rw-r--r-- | arch/arm/mach-realview/platsmp.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c new file mode 100644 index 00000000..963bf0d8 --- /dev/null +++ b/arch/arm/mach-realview/platsmp.c @@ -0,0 +1,90 @@ +/* + * 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) +{ + int i; + + /* + * Initialise the present map, which describes the set of CPUs + * actually populated at the present time. + */ + for (i = 0; i < max_cpus; i++) + set_cpu_present(i, true); + + 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)); +} |