import PULS_20160108

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm64 / kernel / smp_spin_table.c

diff --git a/arch/arm64/kernel/smp_spin_table.c b/arch/arm64/kernel/smp_spin_table.c
index 7c35fa682f76de7674af23e079b522fc4ac22298..87f32f3d3d87036e17059e6f945cc339abff8136 100644 (file)
--- a/arch/arm64/kernel/smp_spin_table.c
+++ b/arch/arm64/kernel/smp_spin_table.c
@@ -16,15 +16,43 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/of.h>
 #include <linux/smp.h>
 
 #include <asm/cacheflush.h>
+#include <asm/cpu_ops.h>
+#include <asm/cputype.h>
+#include <asm/smp_plat.h>
+
+extern void secondary_holding_pen(void);
+volatile unsigned long secondary_holding_pen_release = INVALID_HWID;
+
+#include <linux/io.h>
+#include <linux/of_address.h>
+
 
 static phys_addr_t cpu_release_addr[NR_CPUS];
+static DEFINE_RAW_SPINLOCK(boot_lock);
+
+/*
+ * Write secondary_holding_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(u64 val)
+{
+       void *start = (void *)&secondary_holding_pen_release;
+       unsigned long size = sizeof(secondary_holding_pen_release);
+
+       secondary_holding_pen_release = val;
+       __flush_dcache_area(start, size);
+}
+
 
-static int __init smp_spin_table_init_cpu(struct device_node *dn, int cpu)
+static int smp_spin_table_cpu_init(struct device_node *dn, unsigned int cpu)
 {
        /*
         * Determine the address from which the CPU is polling.
@@ -40,13 +68,37 @@ static int __init smp_spin_table_init_cpu(struct device_node *dn, int cpu)
        return 0;
 }
 
-static int __init smp_spin_table_prepare_cpu(int cpu)
+/*MTK only*/
+#define CCI400_SI4_BASE                                 0x5000
+#define CCI400_SI4_SNOOP_CONTROL           CCI400_SI4_BASE
+#define DVM_MSG_REQ                                     (1U << 1)
+#define SNOOP_REQ                                       (1U << 0)
+#define CCI400_STATUS                                   0x000C
+#define CHANGE_PENDING                                  (1U << 0)
+
+static int smp_spin_table_cpu_prepare(unsigned int cpu)
 {
        void **release_addr;
 
+    struct device_node *node;
+    void __iomem *cci400_base;
+
        if (!cpu_release_addr[cpu])
                return -ENODEV;
 
+    /*MTK only. Setup coherence interface*/
+    node = of_find_compatible_node(NULL, NULL, "mediatek,CCI400");
+    if(node)
+    {
+        cci400_base = of_iomap(node, 0);
+                
+        printk(KERN_EMERG "1.CCI400_SI4_SNOOP_CONTROL:0x%p, 0x%08x\n", cci400_base + CCI400_SI4_SNOOP_CONTROL, readl(cci400_base + CCI400_SI4_SNOOP_CONTROL));
+        /* Enable snoop requests and DVM message requests*/
+        writel(readl(cci400_base + CCI400_SI4_SNOOP_CONTROL) | (SNOOP_REQ | DVM_MSG_REQ), cci400_base + CCI400_SI4_SNOOP_CONTROL);
+        while (readl(cci400_base + CCI400_STATUS) & CHANGE_PENDING);
+        printk(KERN_EMERG "2.CCI400_SI4_SNOOP_CONTROL:0x%p, 0x%08x\n", cci400_base + CCI400_SI4_SNOOP_CONTROL,readl(cci400_base + CCI400_SI4_SNOOP_CONTROL));
+    }
+
        release_addr = __va(cpu_release_addr[cpu]);
        release_addr[0] = (void *)__pa(secondary_holding_pen);
        __flush_dcache_area(release_addr, sizeof(release_addr[0]));
@@ -59,8 +111,60 @@ static int __init smp_spin_table_prepare_cpu(int cpu)
        return 0;
 }
 
-const struct smp_enable_ops smp_spin_table_ops __initconst = {
+static int smp_spin_table_cpu_boot(unsigned int cpu)
+{
+       unsigned long timeout;
+
+       /*
+        * Set synchronisation state between this boot processor
+        * and the secondary one
+        */
+       raw_spin_lock(&boot_lock);
+
+       /*
+        * Update the pen release flag.
+        */
+       write_pen_release(cpu_logical_map(cpu));
+
+       /*
+        * Send an event, causing the secondaries to read pen_release.
+        */
+       sev();
+
+       timeout = jiffies + (1 * HZ);
+       while (time_before(jiffies, timeout)) {
+               if (secondary_holding_pen_release == INVALID_HWID)
+                       break;
+               udelay(10);
+       }
+
+       /*
+        * Now the secondary core is starting up let it run its
+        * calibrations, then wait for it to finish
+        */
+       raw_spin_unlock(&boot_lock);
+
+       return secondary_holding_pen_release != INVALID_HWID ? -ENOSYS : 0;
+}
+
+void smp_spin_table_cpu_postboot(void)
+{
+       /*
+        * Let the primary processor know we're out of the pen.
+        */
+       write_pen_release(INVALID_HWID);
+
+       /*
+        * Synchronise with the boot thread.
+        */
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
+}
+
+const struct cpu_operations smp_spin_table_ops = {
        .name           = "spin-table",
-       .init_cpu       = smp_spin_table_init_cpu,
-       .prepare_cpu    = smp_spin_table_prepare_cpu,
+       .cpu_init       = smp_spin_table_cpu_init,
+       .cpu_prepare    = smp_spin_table_cpu_prepare,
+       .cpu_boot       = smp_spin_table_cpu_boot,
+       .cpu_postboot   = smp_spin_table_cpu_postboot,
 };