msm: 8910: add smp support for 8910
The target cannot be added to the common platsmp file due to CPU
differences. Add new platsmp file along with support to build
that file.
Change-Id: Id0880507d099036951c3737e67341f634681e455
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
diff --git a/arch/arm/mach-msm/Makefile b/arch/arm/mach-msm/Makefile
index e6c6ca6..11b130f 100644
--- a/arch/arm/mach-msm/Makefile
+++ b/arch/arm/mach-msm/Makefile
@@ -45,8 +45,12 @@
ifdef CONFIG_ARCH_MSM8625
obj-$(CONFIG_SMP) += platsmp-8625.o
else
+ifdef CONFIG_ARCH_MSM8910
+ obj-$(CONFIG_SMP) += platsmp-8910.o
+else
obj-$(CONFIG_SMP) += platsmp.o
endif
+endif
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
obj-$(CONFIG_MSM_CPU_AVS) += avs.o
diff --git a/arch/arm/mach-msm/platsmp-8910.c b/arch/arm/mach-msm/platsmp-8910.c
new file mode 100644
index 0000000..5d055bd
--- /dev/null
+++ b/arch/arm/mach-msm/platsmp-8910.c
@@ -0,0 +1,190 @@
+/* Copyright (c) 2012, The Linux Foundation. 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 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#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/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+#include <asm/hardware/gic.h>
+#include <mach/msm_iomap.h>
+#include "pm.h"
+
+#define BOOT_REMAP_ENABLE 0x01
+
+/*
+ * 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 __cpuinit 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 DEFINE_SPINLOCK(boot_lock);
+
+void __cpuinit platform_secondary_init(unsigned int cpu)
+{
+ WARN_ON(msm_platform_secondary_init(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);
+}
+
+static int __cpuinit release_secondary_sim(unsigned long base, int cpu)
+{
+ void *base_ptr;
+
+ base_ptr = ioremap_nocache(base + (cpu * 0x10000), SZ_4K);
+ if (!base_ptr) {
+ pr_err("Failed to release core %u\n", cpu);
+ return -ENODEV;
+ }
+
+ writel_relaxed(0x800, base_ptr+0x04);
+ writel_relaxed(0x3FFF, base_ptr+0x14);
+ mb();
+
+ return 0;
+}
+
+DEFINE_PER_CPU(int, cold_boot_done);
+
+int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ unsigned long timeout;
+
+ preset_lpj = loops_per_jiffy;
+
+ if (per_cpu(cold_boot_done, cpu) == false) {
+ release_secondary_sim(0xF9088000, cpu);
+ per_cpu(cold_boot_done, cpu) = true;
+ }
+
+ /*
+ * Set synchronisation state between this boot processor
+ * and the secondary one
+ */
+ spin_lock(&boot_lock);
+
+ /*
+ * The secondary processor is waiting to be released from
+ * the holding pen - release it, then wait for it to flag
+ * that it has been released by resetting pen_release.
+ *
+ * Note that "pen_release" is the hardware CPU ID, whereas
+ * "cpu" is Linux's internal ID.
+ */
+ 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.
+ */
+
+ gic_raise_softirq(cpumask_of(cpu), 1);
+
+ timeout = jiffies + (1 * HZ);
+ while (time_before(jiffies, timeout)) {
+ smp_rmb();
+ 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 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)
+{
+ unsigned int i, ncores;
+
+ ncores = (__raw_readl(MSM_APCS_GCC_BASE + 0x30)) & 0xF;
+
+ 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;
+ void __iomem *remap_ptr;
+
+ /*
+ * 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);
+
+ /*
+ * Enable boot remapping and write the address of secondary
+ * startup into boot remapper register
+ */
+ remap_ptr = ioremap_nocache(0xF9010000, SZ_4K); /* APCS_CFG_SECURE */
+ if (!remap_ptr) {
+ pr_err("Failed to ioremap for secondary cores\n");
+ return;
+ }
+
+ __raw_writel((virt_to_phys(msm_secondary_startup)|BOOT_REMAP_ENABLE),
+ (remap_ptr + 0x4));
+ mb();
+ iounmap(remap_ptr);
+}