1 files changed, 100 insertions, 23 deletions

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 7a79b24597b2..fef42b21cecb 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -18,20 +18,23 @@
 #include <linux/smp.h>
 #include <linux/jiffies.h>
 #include <linux/clockchips.h>
-#include <linux/irq.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
 
 #include <asm/smp_twd.h>
 #include <asm/localtimer.h>
 #include <asm/hardware/gic.h>
 
 /* set up by the platform code */
-void __iomem *twd_base;
+static void __iomem *twd_base;
 
 static struct clk *twd_clk;
 static unsigned long twd_timer_rate;
 
 static struct clock_event_device __percpu **twd_evt;
+static int twd_ppi;
 
 static void twd_set_mode(enum clock_event_mode mode,
                         struct clock_event_device *clk)
@@ -77,7 +80,7 @@ static int twd_set_next_event(unsigned long evt,
  * If a local timer interrupt has occurred, acknowledge and return 1.
  * Otherwise, return 0.
  */
-int twd_timer_ack(void)
+static int twd_timer_ack(void)
 {
         if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) {
                 __raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
@@ -87,7 +90,7 @@ int twd_timer_ack(void)
         return 0;
 }
 
-void twd_timer_stop(struct clock_event_device *clk)
+static void twd_timer_stop(struct clock_event_device *clk)
 {
         twd_set_mode(CLOCK_EVT_MODE_UNUSED, clk);
         disable_percpu_irq(clk->irq);
@@ -222,28 +225,10 @@ static struct clk *twd_get_clock(void)
 /*
  * Setup the local clock events for a CPU.
  */
-void __cpuinit twd_timer_setup(struct clock_event_device *clk)
+static int __cpuinit twd_timer_setup(struct clock_event_device *clk)
 {
         struct clock_event_device **this_cpu_clk;
 
-        if (!twd_evt) {
-                int err;
-
-                twd_evt = alloc_percpu(struct clock_event_device *);
-                if (!twd_evt) {
-                        pr_err("twd: can't allocate memory\n");
-                        return;
-                }
-
-                err = request_percpu_irq(clk->irq, twd_handler,
-                                         "twd", twd_evt);
-                if (err) {
-                        pr_err("twd: can't register interrupt %d (%d)\n",
-                               clk->irq, err);
-                        return;
-                }
-        }
-
         if (!twd_clk)
                 twd_clk = twd_get_clock();
 
@@ -260,6 +245,7 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
         clk->rating = 350;
         clk->set_mode = twd_set_mode;
         clk->set_next_event = twd_set_next_event;
+        clk->irq = twd_ppi;
 
         this_cpu_clk = __this_cpu_ptr(twd_evt);
         *this_cpu_clk = clk;
@@ -267,4 +253,95 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
         clockevents_config_and_register(clk, twd_timer_rate,
                                         0xf, 0xffffffff);
         enable_percpu_irq(clk->irq, 0);
+
+        return 0;
+}
+
+static struct local_timer_ops twd_lt_ops __cpuinitdata = {
+        .setup  = twd_timer_setup,
+        .stop   = twd_timer_stop,
+};
+
+static int __init twd_local_timer_common_register(void)
+{
+        int err;
+
+        twd_evt = alloc_percpu(struct clock_event_device *);
+        if (!twd_evt) {
+                err = -ENOMEM;
+                goto out_free;
+        }
+
+        err = request_percpu_irq(twd_ppi, twd_handler, "twd", twd_evt);
+        if (err) {
+                pr_err("twd: can't register interrupt %d (%d)\n", twd_ppi, err);
+                goto out_free;
+        }
+
+        err = local_timer_register(&twd_lt_ops);
+        if (err)
+                goto out_irq;
+
+        return 0;
+
+out_irq:
+        free_percpu_irq(twd_ppi, twd_evt);
+out_free:
+        iounmap(twd_base);
+        twd_base = NULL;
+        free_percpu(twd_evt);
+
+        return err;
 }
+
+int __init twd_local_timer_register(struct twd_local_timer *tlt)
+{
+        if (twd_base || twd_evt)
+                return -EBUSY;
+
+        twd_ppi = tlt->res[1].start;
+
+        twd_base = ioremap(tlt->res[0].start, resource_size(&tlt->res[0]));
+        if (!twd_base)
+                return -ENOMEM;
+
+        return twd_local_timer_common_register();
+}
+
+#ifdef CONFIG_OF
+const static struct of_device_id twd_of_match[] __initconst = {
+        { .compatible = "arm,cortex-a9-twd-timer",      },
+        { .compatible = "arm,cortex-a5-twd-timer",      },
+        { .compatible = "arm,arm11mp-twd-timer",        },
+        { },
+};
+
+void __init twd_local_timer_of_register(void)
+{
+        struct device_node *np;
+        int err;
+
+        np = of_find_matching_node(NULL, twd_of_match);
+        if (!np) {
+                err = -ENODEV;
+                goto out;
+        }
+
+        twd_ppi = irq_of_parse_and_map(np, 0);
+        if (!twd_ppi) {
+                err = -EINVAL;
+                goto out;
+        }
+
+        twd_base = of_iomap(np, 0);
+        if (!twd_base) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        err = twd_local_timer_common_register();
+
+out:
+        WARN(err, "twd_local_timer_of_register failed (%d)\n", err);
+}
+#endif