140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*
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* Sunxi platform smp source file.
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* It contains platform specific fucntions needed for the linux smp kernel.
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*
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* Copyright (c) Allwinner. All rights reserved.
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* Sugar (shuge@allwinnertech.com)
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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; either version 2 of the License, or
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* (at your option) any later version.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/delay.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
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#include <linux/sunxi-sid.h>
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#include "platsmp.h"
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extern void sunxi_secondary_startup(void);
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extern void secondary_startup(void);
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static DEFINE_SPINLOCK(boot_lock);
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void __iomem *sunxi_cpucfg_base;
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void __iomem *sunxi_rtc_base;
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void __iomem *sunxi_sysctl_base;
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void __iomem *sunxi_r_prcm_base;
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void *cpus_boot_entry[NR_CPUS];
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static void sunxi_set_cpus_boot_entry(int cpu, void *entry)
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{
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if (cpu < NR_CPUS) {
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cpus_boot_entry[cpu] = (void *)(virt_to_phys(entry));
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smp_wmb();
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__cpuc_flush_dcache_area(cpus_boot_entry, sizeof(cpus_boot_entry));
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outer_clean_range(__pa(&cpus_boot_entry), __pa(&cpus_boot_entry + 1));
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}
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}
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static void sunxi_smp_iomap_init(void)
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{
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sunxi_cpucfg_base = ioremap(SUNXI_CPUCFG_PBASE, SZ_1K);
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#if (defined CONFIG_ARCH_SUN8IW10) || (defined CONFIG_ARCH_SUN8IW17)
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sunxi_rtc_base = ioremap(SUNXI_RTC_PBASE, SZ_1K);
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pr_debug("cpucfg_base=0x%p rtc_base=0x%p\n", sunxi_cpucfg_base, sunxi_rtc_base);
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#elif (defined CONFIG_ARCH_SUN8IW5)
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sunxi_r_prcm_base = ioremap(SUNXI_R_PRCM_PBASE, SZ_1K);
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pr_debug("SUNXI_R_PRCM_PBASE=0x%p\n", sunxi_r_prcm_base);
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#else
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sunxi_sysctl_base = ioremap(SUNXI_SYSCTL_PBASE, SZ_1K);
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pr_debug("cpucfg_base=0x%p sysctl_base=0x%p\n", sunxi_cpucfg_base, sunxi_sysctl_base);
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#endif
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}
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static void sunxi_smp_init_cpus(void)
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{
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unsigned int i, ncores = get_nr_cores();
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#if defined(CONFIG_ARCH_SUN8IW11)
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unsigned int chip_ver = sunxi_get_soc_ver();
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switch (chip_ver) {
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case SUN8IW11P2_REV_A:
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case SUN8IW11P3_REV_A:
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case SUN8IW11P4_REV_A:
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ncores = 4;
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break;
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case SUN8IW11P1_REV_A:
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default:
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ncores = 2;
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break;
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}
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#endif
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pr_debug("[%s] ncores=%d\n", __func__, ncores);
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/* Limit possible CPUs to defconfig */
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if (ncores > nr_cpu_ids) {
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pr_warn("SMP: %u CPUs physically present. Only %d configured.\n",
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ncores, nr_cpu_ids);
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ncores = nr_cpu_ids;
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}
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for (i = 0; i < ncores; i++)
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set_cpu_possible(i, true);
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#ifdef CONFIG_CPU_IDLE_SUNXI
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sunxi_idle_cpux_flag_init();
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#endif
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sunxi_smp_iomap_init();
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pr_debug("[%s] done\n", __func__);
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}
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/*
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* Boot a secondary CPU, and assign it the specified idle task.
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* This also gives us the initial stack to use for this CPU.
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*/
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int sunxi_smp_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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spin_lock(&boot_lock);
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#ifdef CONFIG_CPU_IDLE_SUNXI
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sunxi_set_secondary_entry((void *)
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(virt_to_phys(sunxi_cpux_entry_judge)));
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#else
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sunxi_set_secondary_entry((void *)
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(virt_to_phys(sunxi_secondary_startup)));
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#endif
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sunxi_set_cpus_boot_entry(cpu, secondary_startup);
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sunxi_enable_cpu(cpu);
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/*
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* Now the secondary core is starting up let it run its
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* calibrations, then wait for it to finish
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*/
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spin_unlock(&boot_lock);
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pr_debug("[%s] done\n", __func__);
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return 0;
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}
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struct smp_operations sunxi_smp_ops __initdata = {
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.smp_init_cpus = sunxi_smp_init_cpus,
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.smp_boot_secondary = sunxi_smp_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = sunxi_cpu_die,
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.cpu_kill = sunxi_cpu_kill,
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.cpu_disable = sunxi_cpu_disable,
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#endif
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};
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