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ARM: use device tree to get smp_twd clock
Move clk setup to twd_local_timer_common_register and rely on twd_timer_rate being 0 to force calibration if there is no clock. Remove common_setup_called as it is no longer needed. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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ab45bd9bed
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1 changed files with 19 additions and 34 deletions
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@ -31,7 +31,6 @@ static void __iomem *twd_base;
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static struct clk *twd_clk;
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static unsigned long twd_timer_rate;
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static bool common_setup_called;
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static DEFINE_PER_CPU(bool, percpu_setup_called);
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static struct clock_event_device __percpu **twd_evt;
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@ -239,25 +238,28 @@ static irqreturn_t twd_handler(int irq, void *dev_id)
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return IRQ_NONE;
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}
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static struct clk *twd_get_clock(void)
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static void twd_get_clock(struct device_node *np)
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{
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struct clk *clk;
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int err;
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clk = clk_get_sys("smp_twd", NULL);
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if (IS_ERR(clk)) {
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pr_err("smp_twd: clock not found: %d\n", (int)PTR_ERR(clk));
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return clk;
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if (np)
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twd_clk = of_clk_get(np, 0);
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else
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twd_clk = clk_get_sys("smp_twd", NULL);
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if (IS_ERR(twd_clk)) {
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pr_err("smp_twd: clock not found %d\n", (int) PTR_ERR(twd_clk));
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return;
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}
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err = clk_prepare_enable(clk);
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err = clk_prepare_enable(twd_clk);
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if (err) {
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pr_err("smp_twd: clock failed to prepare+enable: %d\n", err);
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clk_put(clk);
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return ERR_PTR(err);
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clk_put(twd_clk);
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return;
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}
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return clk;
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twd_timer_rate = clk_get_rate(twd_clk);
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}
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/*
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@ -280,26 +282,7 @@ static int __cpuinit twd_timer_setup(struct clock_event_device *clk)
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}
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per_cpu(percpu_setup_called, cpu) = true;
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/*
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* This stuff only need to be done once for the entire TWD cluster
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* during the runtime of the system.
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*/
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if (!common_setup_called) {
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twd_clk = twd_get_clock();
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/*
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* We use IS_ERR_OR_NULL() here, because if the clock stubs
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* are active we will get a valid clk reference which is
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* however NULL and will return the rate 0. In that case we
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* need to calibrate the rate instead.
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*/
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if (!IS_ERR_OR_NULL(twd_clk))
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twd_timer_rate = clk_get_rate(twd_clk);
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else
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twd_calibrate_rate();
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common_setup_called = true;
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}
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twd_calibrate_rate();
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/*
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* The following is done once per CPU the first time .setup() is
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@ -330,7 +313,7 @@ static struct local_timer_ops twd_lt_ops __cpuinitdata = {
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.stop = twd_timer_stop,
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};
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static int __init twd_local_timer_common_register(void)
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static int __init twd_local_timer_common_register(struct device_node *np)
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{
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int err;
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@ -350,6 +333,8 @@ static int __init twd_local_timer_common_register(void)
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if (err)
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goto out_irq;
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twd_get_clock(np);
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return 0;
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out_irq:
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@ -373,7 +358,7 @@ int __init twd_local_timer_register(struct twd_local_timer *tlt)
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if (!twd_base)
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return -ENOMEM;
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return twd_local_timer_common_register();
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return twd_local_timer_common_register(NULL);
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}
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#ifdef CONFIG_OF
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@ -405,7 +390,7 @@ void __init twd_local_timer_of_register(void)
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goto out;
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}
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err = twd_local_timer_common_register();
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err = twd_local_timer_common_register(np);
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out:
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WARN(err, "twd_local_timer_of_register failed (%d)\n", err);
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