Merge branch 'rmobile/smp' into rmobile-latest

6 files changed, 201 insertions, 8 deletions

diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile
index 997bd2bcd5f6..7ad6954c46cd 100644
--- a/arch/arm/mach-shmobile/Makefile
+++ b/arch/arm/mach-shmobile/Makefile
@@ -18,6 +18,7 @@ smp-y				:= platsmp.o headsmp.o
 smp-$(CONFIG_HOTPLUG_CPU)       += hotplug.o
 smp-$(CONFIG_LOCAL_TIMERS)      += localtimer.o
 smp-$(CONFIG_ARCH_SH73A0)       += smp-sh73a0.o
+smp-$(CONFIG_ARCH_R8A7779)      += smp-r8a7779.o
 
 # Pinmux setup
 pfc-y                           :=
diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h
index 44ce124bfdec..e4b945e271e7 100644
--- a/arch/arm/mach-shmobile/include/mach/common.h
+++ b/arch/arm/mach-shmobile/include/mach/common.h
@@ -68,4 +68,10 @@ extern void r8a7779_clock_init(void);
 extern void r8a7779_pinmux_init(void);
 extern void r8a7779_pm_init(void);
 
+extern unsigned int r8a7779_get_core_count(void);
+extern int r8a7779_platform_cpu_kill(unsigned int cpu);
+extern void r8a7779_secondary_init(unsigned int cpu);
+extern int r8a7779_boot_secondary(unsigned int cpu);
+extern void r8a7779_smp_prepare_cpus(void);
+
 #endif /* __ARCH_MACH_COMMON_H */
diff --git a/arch/arm/mach-shmobile/include/mach/r8a7779.h b/arch/arm/mach-shmobile/include/mach/r8a7779.h
index e6a6166fdf22..b07ad318eb2e 100644
--- a/arch/arm/mach-shmobile/include/mach/r8a7779.h
+++ b/arch/arm/mach-shmobile/include/mach/r8a7779.h
@@ -343,6 +343,9 @@ static inline struct r8a7779_pm_ch *to_r8a7779_ch(struct generic_pm_domain *d)
         return &container_of(d, struct r8a7779_pm_domain, genpd)->ch;
 }
 
+extern int r8a7779_sysc_power_down(struct r8a7779_pm_ch *r8a7779_ch);
+extern int r8a7779_sysc_power_up(struct r8a7779_pm_ch *r8a7779_ch);
+
 #ifdef CONFIG_PM
 extern struct r8a7779_pm_domain r8a7779_sh4a;
 extern struct r8a7779_pm_domain r8a7779_sgx;
diff --git a/arch/arm/mach-shmobile/platsmp.c b/arch/arm/mach-shmobile/platsmp.c
index 3f3325d4206d..993381257f69 100644
--- a/arch/arm/mach-shmobile/platsmp.c
+++ b/arch/arm/mach-shmobile/platsmp.c
@@ -22,12 +22,16 @@
 #include <mach/common.h>
 
 #define is_sh73a0() (machine_is_ag5evm() || machine_is_kota2())
+#define is_r8a7779() machine_is_marzen()
 
 static unsigned int __init shmobile_smp_get_core_count(void)
 {
         if (is_sh73a0())
                 return sh73a0_get_core_count();
 
+        if (is_r8a7779())
+                return r8a7779_get_core_count();
+
         return 1;
 }
 
@@ -35,10 +39,16 @@ static void __init shmobile_smp_prepare_cpus(void)
 {
         if (is_sh73a0())
                 sh73a0_smp_prepare_cpus();
+
+        if (is_r8a7779())
+                r8a7779_smp_prepare_cpus();
 }
 
 int shmobile_platform_cpu_kill(unsigned int cpu)
 {
+        if (is_r8a7779())
+                return r8a7779_platform_cpu_kill(cpu);
+
         return 1;
 }
 
@@ -48,6 +58,9 @@ void __cpuinit platform_secondary_init(unsigned int cpu)
 
         if (is_sh73a0())
                 sh73a0_secondary_init(cpu);
+
+        if (is_r8a7779())
+                r8a7779_secondary_init(cpu);
 }
 
 int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
@@ -55,6 +68,9 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
         if (is_sh73a0())
                 return sh73a0_boot_secondary(cpu);
 
+        if (is_r8a7779())
+                return r8a7779_boot_secondary(cpu);
+
         return -ENOSYS;
 }
 
diff --git a/arch/arm/mach-shmobile/pm-r8a7779.c b/arch/arm/mach-shmobile/pm-r8a7779.c
index d9c56fe067a5..c38ba7b43ef8 100644
--- a/arch/arm/mach-shmobile/pm-r8a7779.c
+++ b/arch/arm/mach-shmobile/pm-r8a7779.c
@@ -48,7 +48,9 @@ static void __iomem *r8a7779_sysc_base;
 #define SYSCISR_RETRIES 1000
 #define SYSCISR_DELAY_US 1
 
-#ifdef CONFIG_PM
+#if defined(CONFIG_PM) || defined(CONFIG_SMP)
+
+static DEFINE_SPINLOCK(r8a7779_sysc_lock); /* SMP CPUs + I/O devices */
 
 static int r8a7779_sysc_pwr_on_off(struct r8a7779_pm_ch *r8a7779_ch,
                                    int sr_bit, int reg_offs)
@@ -86,9 +88,12 @@ static int r8a7779_sysc_update(struct r8a7779_pm_ch *r8a7779_ch,
         unsigned int isr_mask = 1 << r8a7779_ch->isr_bit;
         unsigned int chan_mask = 1 << r8a7779_ch->chan_bit;
         unsigned int status;
+        unsigned long flags;
         int ret = 0;
         int k;
 
+        spin_lock_irqsave(&r8a7779_sysc_lock, flags);
+
         iowrite32(isr_mask, r8a7779_sysc_base + SYSCISCR);
 
         do {
@@ -112,6 +117,8 @@ static int r8a7779_sysc_update(struct r8a7779_pm_ch *r8a7779_ch,
         iowrite32(isr_mask, r8a7779_sysc_base + SYSCISCR);
 
  out:
+        spin_unlock_irqrestore(&r8a7779_sysc_lock, flags);
+
         pr_debug("r8a7779 power domain %d: %02x %02x %02x %02x %02x -> %d\n",
                  r8a7779_ch->isr_bit, ioread32(r8a7779_sysc_base + PWRSR0),
                  ioread32(r8a7779_sysc_base + PWRSR1),
@@ -121,12 +128,12 @@ static int r8a7779_sysc_update(struct r8a7779_pm_ch *r8a7779_ch,
         return ret;
 }
 
-static int r8a7779_sysc_power_down(struct r8a7779_pm_ch *r8a7779_ch)
+int r8a7779_sysc_power_down(struct r8a7779_pm_ch *r8a7779_ch)
 {
         return r8a7779_sysc_update(r8a7779_ch, r8a7779_sysc_pwr_off);
 }
 
-static int r8a7779_sysc_power_up(struct r8a7779_pm_ch *r8a7779_ch)
+int r8a7779_sysc_power_up(struct r8a7779_pm_ch *r8a7779_ch)
 {
         return r8a7779_sysc_update(r8a7779_ch, r8a7779_sysc_pwr_on);
 }
@@ -142,6 +149,14 @@ static void __init r8a7779_sysc_init(void)
         iowrite32(0, r8a7779_sysc_base + SYSCIMR);
 }
 
+#else /* CONFIG_PM || CONFIG_SMP */
+
+static inline void r8a7779_sysc_init(void) {}
+
+#endif /* CONFIG_PM || CONFIG_SMP */
+
+#ifdef CONFIG_PM
+
 static int pd_power_down(struct generic_pm_domain *genpd)
 {
         return r8a7779_sysc_power_down(to_r8a7779_ch(genpd));
@@ -223,13 +238,12 @@ struct r8a7779_pm_domain r8a7779_impx3 = {
         }
 };
 
-#else /* CONFIG_PM */
-
-static inline void r8a7779_sysc_init(void) {}
-
 #endif /* CONFIG_PM */
 
 void __init r8a7779_pm_init(void)
 {
-        r8a7779_sysc_init();
+        static int once;
+
+        if (!once++)
+                r8a7779_sysc_init();
 }
diff --git a/arch/arm/mach-shmobile/smp-r8a7779.c b/arch/arm/mach-shmobile/smp-r8a7779.c
new file mode 100644
index 000000000000..cc97ef892d1b
--- /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);
+}