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https://github.com/edk2-porting/linux-next.git
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69c31b7a6e
It adds smp and cpu hotplug support for imx6q. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
/*
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* Copyright 2011 Freescale Semiconductor, Inc.
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* Copyright 2011 Linaro Ltd.
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <asm/page.h>
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#include <asm/smp_scu.h>
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#include <asm/hardware/gic.h>
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#include <asm/mach/map.h>
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#include <mach/common.h>
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#include <mach/hardware.h>
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static void __iomem *scu_base;
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static struct map_desc scu_io_desc __initdata = {
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/* .virtual and .pfn are run-time assigned */
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.length = SZ_4K,
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.type = MT_DEVICE,
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};
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void __init imx_scu_map_io(void)
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{
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unsigned long base;
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/* Get SCU base */
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asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
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scu_io_desc.virtual = IMX_IO_P2V(base);
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scu_io_desc.pfn = __phys_to_pfn(base);
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iotable_init(&scu_io_desc, 1);
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scu_base = IMX_IO_ADDRESS(base);
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}
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void __cpuinit platform_secondary_init(unsigned int cpu)
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{
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/*
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* if any interrupts are already enabled for the primary
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* core (e.g. timer irq), then they will not have been enabled
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* for us: do so
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*/
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gic_secondary_init(0);
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}
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int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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imx_set_cpu_jump(cpu, v7_secondary_startup);
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imx_enable_cpu(cpu, true);
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return 0;
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}
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/*
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* Initialise the CPU possible map early - this describes the CPUs
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* which may be present or become present in the system.
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*/
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void __init smp_init_cpus(void)
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{
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int i, ncores;
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ncores = scu_get_core_count(scu_base);
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for (i = 0; i < ncores; i++)
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set_cpu_possible(i, true);
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set_smp_cross_call(gic_raise_softirq);
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}
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void imx_smp_prepare(void)
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{
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scu_enable(scu_base);
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}
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void __init platform_smp_prepare_cpus(unsigned int max_cpus)
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{
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imx_smp_prepare();
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}
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