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Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mach-wmt/platsmp.c')
-rwxr-xr-xANDROID_3.4.5/arch/arm/mach-wmt/platsmp.c202
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diff --git a/ANDROID_3.4.5/arch/arm/mach-wmt/platsmp.c b/ANDROID_3.4.5/arch/arm/mach-wmt/platsmp.c
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+++ b/ANDROID_3.4.5/arch/arm/mach-wmt/platsmp.c
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+/*++
+ linux/arch/arm/mach-wmt/platsmp.c
+
+ Copyright (c) 2013 WonderMedia Technologies, Inc.
+
+ 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 as published by the Free Software Foundation,
+ either version 2 of the License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ You should have received a copy of the GNU General Public License along with
+ this program. If not, see <http://www.gnu.org/licenses/>.
+
+ WonderMedia Technologies, Inc.
+ 10F, 529, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C.
+--*/
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/jiffies.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+
+#include <linux/syscore_ops.h>
+
+#include <asm/cacheflush.h>
+#include <asm/hardware/gic.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+
+#include <mach/hardware.h>
+
+extern void wmt_secondary_startup(void);
+
+#define CPU1_BOOT_REG HSP7_ADDR
+/*
+ * control for which core is the next to come out of the secondary
+ * boot "holding pen"
+ */
+
+volatile int __cpuinitdata pen_release = -1;
+
+/*
+ * Write pen_release in a way that is guaranteed to be visible to all
+ * observers, irrespective of whether they're taking part in coherency
+ * or not. This is necessary for the hotplug code to work reliably.
+ */
+static void write_pen_release(int val)
+{
+ pen_release = val;
+ smp_wmb();
+ __cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release));
+ outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1));
+}
+
+static void __iomem *scu_base_addr(void)
+{
+ return (void __iomem *)(MPCORE_PRIVATE_MEM);
+}
+
+static DEFINE_SPINLOCK(boot_lock);
+
+void __cpuinit platform_secondary_init(unsigned int cpu)
+{
+ /*
+ * if any interrupts are already enabled for the primary
+ * core (e.g. timer irq), then they will not have been enabled
+ * for us: do so
+ */
+ gic_secondary_init(0);
+
+ /*
+ * let the primary processor know we're out of the
+ * pen, then head off into the C entry point
+ */
+ write_pen_release(-1);
+
+ /*
+ * Synchronise with the boot thread.
+ */
+ spin_lock(&boot_lock);
+ spin_unlock(&boot_lock);
+}
+
+int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ unsigned long timeout;
+
+ /*
+ * Set synchronisation state between this boot processor
+ * and the secondary one
+ */
+ spin_lock(&boot_lock);
+
+ /*
+ * This is really belt and braces; we hold unintended secondary
+ * CPUs in the holding pen until we're ready for them. However,
+ * since we haven't sent them a soft interrupt, they shouldn't
+ * be there.
+ */
+ write_pen_release(cpu_logical_map(cpu));
+
+ /*
+ * Send the secondary CPU a soft interrupt, thereby causing
+ * the boot monitor to read the system wide flags register,
+ * and branch to the address found there.
+ */
+
+ timeout = jiffies + (1 * HZ);
+ while (time_before(jiffies, timeout)) {
+ smp_rmb();
+
+ __raw_writel(virt_to_phys(wmt_secondary_startup),
+ CPU1_BOOT_REG);
+ gic_raise_softirq(cpumask_of(cpu), 1);
+
+ if (pen_release == -1)
+ break;
+
+ udelay(10);
+ }
+
+ /*
+ * now the secondary core is starting up let it run its
+ * calibrations, then wait for it to finish
+ */
+ spin_unlock(&boot_lock);
+
+ return pen_release != -1 ? -ENOSYS : 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_cpu_ids) {
+ pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
+ ncores, nr_cpu_ids);
+ ncores = nr_cpu_ids;
+ }
+
+ 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)
+{
+ *(volatile unsigned int *)MPCORE_PRIVATE_MEM |= BIT5 | BIT6;
+ scu_enable(scu_base_addr());
+
+ /*
+ * Write the address of secondary startup into the
+ * system-wide flags register. The boot monitor waits
+ * until it receives a soft interrupt, and then the
+ * secondary CPU branches to this address.
+ */
+ __raw_writel(virt_to_phys(wmt_secondary_startup),
+ CPU1_BOOT_REG);
+}
+
+static int wmt_pm_suspend(void)
+{
+ return 0;
+}
+
+static void wmt_pm_resume(void)
+{
+#ifdef CONFIG_SMP
+ *(volatile unsigned int *)MPCORE_PRIVATE_MEM |= BIT5 | BIT6;
+ scu_enable(scu_base_addr());
+#endif
+ return;
+}
+
+static struct syscore_ops wmt_pm_syscore_ops = {
+ .suspend = wmt_pm_suspend,
+ .resume = wmt_pm_resume,
+};
+
+static __init int wmt_pm_syscore_init(void)
+{
+ register_syscore_ops(&wmt_pm_syscore_ops);
+ return 0;
+}
+arch_initcall(wmt_pm_syscore_init);