diff options
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/timer-sun5i.c | 66 |
1 files changed, 64 insertions, 2 deletions
diff --git a/drivers/clocksource/timer-sun5i.c b/drivers/clocksource/timer-sun5i.c index 23300901405b..28aa4b7bb602 100644 --- a/drivers/clocksource/timer-sun5i.c +++ b/drivers/clocksource/timer-sun5i.c @@ -40,9 +40,13 @@ struct sun5i_timer { void __iomem *base; struct clk *clk; + struct notifier_block clk_rate_cb; u32 ticks_per_jiffy; }; +#define to_sun5i_timer(x) \ + container_of(x, struct sun5i_timer, clk_rate_cb) + struct sun5i_timer_clksrc { struct sun5i_timer timer; struct clocksource clksrc; @@ -151,6 +155,29 @@ static cycle_t sun5i_clksrc_read(struct clocksource *clksrc) return ~readl(cs->timer.base + TIMER_CNTVAL_LO_REG(1)); } +static int sun5i_rate_cb_clksrc(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct clk_notifier_data *ndata = data; + struct sun5i_timer *timer = to_sun5i_timer(nb); + struct sun5i_timer_clksrc *cs = container_of(timer, struct sun5i_timer_clksrc, timer); + + switch (event) { + case PRE_RATE_CHANGE: + clocksource_unregister(&cs->clksrc); + break; + + case POST_RATE_CHANGE: + clocksource_register_hz(&cs->clksrc, ndata->new_rate); + break; + + default: + break; + } + + return NOTIFY_DONE; +} + static int __init sun5i_setup_clocksource(struct device_node *node, void __iomem *base, struct clk *clk, int irq) @@ -173,6 +200,14 @@ static int __init sun5i_setup_clocksource(struct device_node *node, cs->timer.base = base; cs->timer.clk = clk; + cs->timer.clk_rate_cb.notifier_call = sun5i_rate_cb_clksrc; + cs->timer.clk_rate_cb.next = NULL; + + ret = clk_notifier_register(clk, &cs->timer.clk_rate_cb); + if (ret) { + pr_err("Unable to register clock notifier.\n"); + goto err_disable_clk; + } writel(~0, base + TIMER_INTVAL_LO_REG(1)); writel(TIMER_CTL_ENABLE | TIMER_CTL_RELOAD, @@ -187,11 +222,13 @@ static int __init sun5i_setup_clocksource(struct device_node *node, ret = clocksource_register_hz(&cs->clksrc, rate); if (ret) { pr_err("Couldn't register clock source.\n"); - goto err_disable_clk; + goto err_remove_notifier; } return 0; +err_remove_notifier: + clk_notifier_unregister(clk, &cs->timer.clk_rate_cb); err_disable_clk: clk_disable_unprepare(clk); err_free: @@ -199,6 +236,21 @@ err_free: return ret; } +static int sun5i_rate_cb_clkevt(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct clk_notifier_data *ndata = data; + struct sun5i_timer *timer = to_sun5i_timer(nb); + struct sun5i_timer_clkevt *ce = container_of(timer, struct sun5i_timer_clkevt, timer); + + if (event == POST_RATE_CHANGE) { + clockevents_update_freq(&ce->clkevt, ndata->new_rate); + ce->timer.ticks_per_jiffy = DIV_ROUND_UP(ndata->new_rate, HZ); + } + + return NOTIFY_DONE; +} + static int __init sun5i_setup_clockevent(struct device_node *node, void __iomem *base, struct clk *clk, int irq) { @@ -222,6 +274,14 @@ static int __init sun5i_setup_clockevent(struct device_node *node, void __iomem ce->timer.base = base; ce->timer.ticks_per_jiffy = DIV_ROUND_UP(rate, HZ); ce->timer.clk = clk; + ce->timer.clk_rate_cb.notifier_call = sun5i_rate_cb_clkevt; + ce->timer.clk_rate_cb.next = NULL; + + ret = clk_notifier_register(clk, &ce->timer.clk_rate_cb); + if (ret) { + pr_err("Unable to register clock notifier.\n"); + goto err_disable_clk; + } ce->clkevt.name = node->name; ce->clkevt.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; @@ -242,11 +302,13 @@ static int __init sun5i_setup_clockevent(struct device_node *node, void __iomem "sun5i_timer0", ce); if (ret) { pr_err("Unable to register interrupt\n"); - goto err_disable_clk; + goto err_remove_notifier; } return 0; +err_remove_notifier: + clk_notifier_unregister(clk, &ce->timer.clk_rate_cb); err_disable_clk: clk_disable_unprepare(clk); err_free: |