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-rw-r--r--arch/arm/mach-shmobile/smp-emev2.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/smp-emev2.c b/arch/arm/mach-shmobile/smp-emev2.c
new file mode 100644
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+++ b/arch/arm/mach-shmobile/smp-emev2.c
@@ -0,0 +1,97 @@
+/*
+ * SMP support for Emma Mobile EV2
+ *
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ * Copyright (C) 2012 Magnus Damm
+ *
+ * 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; version 2 of the License.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <mach/common.h>
+#include <mach/emev2.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+#include <asm/hardware/gic.h>
+#include <asm/cacheflush.h>
+
+#define EMEV2_SCU_BASE 0x1e000000
+
+static DEFINE_SPINLOCK(scu_lock);
+static void __iomem *scu_base;
+
+static void modify_scu_cpu_psr(unsigned long set, unsigned long clr)
+{
+ unsigned long tmp;
+
+ /* we assume this code is running on a different cpu
+ * than the one that is changing coherency setting */
+ spin_lock(&scu_lock);
+ tmp = readl(scu_base + 8);
+ tmp &= ~clr;
+ tmp |= set;
+ writel(tmp, scu_base + 8);
+ spin_unlock(&scu_lock);
+
+}
+
+unsigned int __init emev2_get_core_count(void)
+{
+ if (!scu_base) {
+ scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE);
+ emev2_clock_init(); /* need ioremapped SMU */
+ }
+
+ WARN_ON_ONCE(!scu_base);
+
+ return scu_base ? scu_get_core_count(scu_base) : 1;
+}
+
+int emev2_platform_cpu_kill(unsigned int cpu)
+{
+ return 0; /* not supported yet */
+}
+
+void __cpuinit emev2_secondary_init(unsigned int cpu)
+{
+ gic_secondary_init(0);
+}
+
+int __cpuinit emev2_boot_secondary(unsigned int cpu)
+{
+ cpu = cpu_logical_map(cpu);
+
+ /* enable cache coherency */
+ modify_scu_cpu_psr(0, 3 << (cpu * 8));
+
+ /* Tell ROM loader about our vector (in headsmp.S) */
+ emev2_set_boot_vector(__pa(shmobile_secondary_vector));
+
+ gic_raise_softirq(cpumask_of(cpu), 1);
+ return 0;
+}
+
+void __init emev2_smp_prepare_cpus(void)
+{
+ int cpu = cpu_logical_map(0);
+
+ scu_enable(scu_base);
+
+ /* enable cache coherency on CPU0 */
+ modify_scu_cpu_psr(0, 3 << (cpu * 8));
+}