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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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683101a662
Rework the EMEV2 SMP code to rely on DT for CPU information instead of reading out number of CPU cores from the SCU. Signed-off-by: Magnus Damm <damm@opensource.se> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/*
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* SMP support for Emma Mobile EV2
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*
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* Copyright (C) 2012 Renesas Solutions Corp.
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* Copyright (C) 2012 Magnus Damm
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <mach/common.h>
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#include <mach/emev2.h>
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#include <asm/smp_plat.h>
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#include <asm/smp_scu.h>
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#define EMEV2_SCU_BASE 0x1e000000
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static int __cpuinit emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
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return 0;
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}
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static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
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{
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/* setup EMEV2 specific SCU base, enable */
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shmobile_scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE);
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scu_enable(shmobile_scu_base);
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/* Tell ROM loader about our vector (in headsmp-scu.S, headsmp.S) */
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emev2_clock_init(); /* need ioremapped SMU */
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emev2_set_boot_vector(__pa(shmobile_boot_vector));
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shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
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shmobile_boot_arg = (unsigned long)shmobile_scu_base;
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/* enable cache coherency on booting CPU */
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scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
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}
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struct smp_operations emev2_smp_ops __initdata = {
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.smp_prepare_cpus = emev2_smp_prepare_cpus,
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.smp_boot_secondary = emev2_boot_secondary,
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};
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