Merge remote-tracking branch 'linus/master' into x86/urgent

1 files changed, 153 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/smp-r8a7779.c b/arch/arm/mach-shmobile/smp-r8a7779.c
new file mode 100644
index 00000000000..cc97ef892d1
--- /dev/null
+++ b/arch/arm/mach-shmobile/smp-r8a7779.c
@@ -0,0 +1,153 @@
+/*
+ * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
+ *
+ * Copyright (C) 2011  Renesas Solutions Corp.
+ * Copyright (C) 2011  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/r8a7779.h>
+#include <asm/smp_scu.h>
+#include <asm/smp_twd.h>
+#include <asm/hardware/gic.h>
+
+#define AVECR 0xfe700040
+
+static struct r8a7779_pm_ch r8a7779_ch_cpu1 = {
+	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
+	.chan_bit = 1, /* ARM1 */
+	.isr_bit = 1, /* ARM1 */
+};
+
+static struct r8a7779_pm_ch r8a7779_ch_cpu2 = {
+	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
+	.chan_bit = 2, /* ARM2 */
+	.isr_bit = 2, /* ARM2 */
+};
+
+static struct r8a7779_pm_ch r8a7779_ch_cpu3 = {
+	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
+	.chan_bit = 3, /* ARM3 */
+	.isr_bit = 3, /* ARM3 */
+};
+
+static struct r8a7779_pm_ch *r8a7779_ch_cpu[4] = {
+	[1] = &r8a7779_ch_cpu1,
+	[2] = &r8a7779_ch_cpu2,
+	[3] = &r8a7779_ch_cpu3,
+};
+
+static void __iomem *scu_base_addr(void)
+{
+	return (void __iomem *)0xf0000000;
+}
+
+static DEFINE_SPINLOCK(scu_lock);
+static unsigned long tmp;
+
+static void modify_scu_cpu_psr(unsigned long set, unsigned long clr)
+{
+	void __iomem *scu_base = scu_base_addr();
+
+	spin_lock(&scu_lock);
+	tmp = __raw_readl(scu_base + 8);
+	tmp &= ~clr;
+	tmp |= set;
+	spin_unlock(&scu_lock);
+
+	/* disable cache coherency after releasing the lock */
+	__raw_writel(tmp, scu_base + 8);
+}
+
+unsigned int __init r8a7779_get_core_count(void)
+{
+	void __iomem *scu_base = scu_base_addr();
+
+#ifdef CONFIG_HAVE_ARM_TWD
+	/* twd_base needs to be initialized before percpu_timer_setup() */
+	twd_base = (void __iomem *)0xf0000600;
+#endif
+
+	return scu_get_core_count(scu_base);
+}
+
+int r8a7779_platform_cpu_kill(unsigned int cpu)
+{
+	struct r8a7779_pm_ch *ch = NULL;
+	int ret = -EIO;
+
+	cpu = cpu_logical_map(cpu);
+
+	/* disable cache coherency */
+	modify_scu_cpu_psr(3 << (cpu * 8), 0);
+
+	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
+		ch = r8a7779_ch_cpu[cpu];
+
+	if (ch)
+		ret = r8a7779_sysc_power_down(ch);
+
+	return ret ? ret : 1;
+}
+
+void __cpuinit r8a7779_secondary_init(unsigned int cpu)
+{
+	gic_secondary_init(0);
+}
+
+int __cpuinit r8a7779_boot_secondary(unsigned int cpu)
+{
+	struct r8a7779_pm_ch *ch = NULL;
+	int ret = -EIO;
+
+	cpu = cpu_logical_map(cpu);
+
+	/* enable cache coherency */
+	modify_scu_cpu_psr(0, 3 << (cpu * 8));
+
+	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
+		ch = r8a7779_ch_cpu[cpu];
+
+	if (ch)
+		ret = r8a7779_sysc_power_up(ch);
+
+	return ret;
+}
+
+void __init r8a7779_smp_prepare_cpus(void)
+{
+	int cpu = cpu_logical_map(0);
+
+	scu_enable(scu_base_addr());
+
+	/* Map the reset vector (in headsmp.S) */
+	__raw_writel(__pa(shmobile_secondary_vector), __io(AVECR));
+
+	/* enable cache coherency on CPU0 */
+	modify_scu_cpu_psr(0, 3 << (cpu * 8));
+
+	r8a7779_pm_init();
+
+	/* power off secondary CPUs */
+	r8a7779_platform_cpu_kill(1);
+	r8a7779_platform_cpu_kill(2);
+	r8a7779_platform_cpu_kill(3);
+}