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Message-ID: <20230630201800.16501-2-mans@mansr.com>
Date: Fri, 30 Jun 2023 21:01:26 +0100
From: Mans Rullgard <mans@...sr.com>
To: Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Maxime Ripard <mripard@...nel.org>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-sunxi@...ts.linux.dev
Subject: [PATCH 1/3] clocksource: sun5i: remove duplication of code and data
Move the clocksource and clock_event_device structs into the main
struct sun5i_timer, and update the code for the new layout. This
removes a lot of duplication of both code and data.
Signed-off-by: Mans Rullgard <mans@...sr.com>
---
drivers/clocksource/timer-sun5i.c | 206 +++++++++++-------------------
1 file changed, 76 insertions(+), 130 deletions(-)
diff --git a/drivers/clocksource/timer-sun5i.c b/drivers/clocksource/timer-sun5i.c
index 7d5fa9069906..e0ca97cf80cb 100644
--- a/drivers/clocksource/timer-sun5i.c
+++ b/drivers/clocksource/timer-sun5i.c
@@ -35,31 +35,26 @@
#define TIMER_SYNC_TICKS 3
-struct sun5i_timer {
+/* Pointless struct to minimise diff */
+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 sun5i_timer {
+ struct _sun5i_timer timer;
struct clocksource clksrc;
-};
-
-#define to_sun5i_timer_clksrc(x) \
- container_of(x, struct sun5i_timer_clksrc, clksrc)
-
-struct sun5i_timer_clkevt {
- struct sun5i_timer timer;
struct clock_event_device clkevt;
};
-#define to_sun5i_timer_clkevt(x) \
- container_of(x, struct sun5i_timer_clkevt, clkevt)
+#define nb_to_sun5i_timer(x) \
+ container_of(x, struct sun5i_timer, timer.clk_rate_cb)
+#define clksrc_to_sun5i_timer(x) \
+ container_of(x, struct sun5i_timer, clksrc)
+#define clkevt_to_sun5i_timer(x) \
+ container_of(x, struct sun5i_timer, clkevt)
/*
* When we disable a timer, we need to wait at least for 2 cycles of
@@ -67,7 +62,7 @@ struct sun5i_timer_clkevt {
* that is already setup and runs at the same frequency than the other
* timers, and we never will be disabled.
*/
-static void sun5i_clkevt_sync(struct sun5i_timer_clkevt *ce)
+static void sun5i_clkevt_sync(struct sun5i_timer *ce)
{
u32 old = readl(ce->timer.base + TIMER_CNTVAL_LO_REG(1));
@@ -75,7 +70,7 @@ static void sun5i_clkevt_sync(struct sun5i_timer_clkevt *ce)
cpu_relax();
}
-static void sun5i_clkevt_time_stop(struct sun5i_timer_clkevt *ce, u8 timer)
+static void sun5i_clkevt_time_stop(struct sun5i_timer *ce, u8 timer)
{
u32 val = readl(ce->timer.base + TIMER_CTL_REG(timer));
writel(val & ~TIMER_CTL_ENABLE, ce->timer.base + TIMER_CTL_REG(timer));
@@ -83,12 +78,12 @@ static void sun5i_clkevt_time_stop(struct sun5i_timer_clkevt *ce, u8 timer)
sun5i_clkevt_sync(ce);
}
-static void sun5i_clkevt_time_setup(struct sun5i_timer_clkevt *ce, u8 timer, u32 delay)
+static void sun5i_clkevt_time_setup(struct sun5i_timer *ce, u8 timer, u32 delay)
{
writel(delay, ce->timer.base + TIMER_INTVAL_LO_REG(timer));
}
-static void sun5i_clkevt_time_start(struct sun5i_timer_clkevt *ce, u8 timer, bool periodic)
+static void sun5i_clkevt_time_start(struct sun5i_timer *ce, u8 timer, bool periodic)
{
u32 val = readl(ce->timer.base + TIMER_CTL_REG(timer));
@@ -103,7 +98,7 @@ static void sun5i_clkevt_time_start(struct sun5i_timer_clkevt *ce, u8 timer, boo
static int sun5i_clkevt_shutdown(struct clock_event_device *clkevt)
{
- struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
+ struct sun5i_timer *ce = clkevt_to_sun5i_timer(clkevt);
sun5i_clkevt_time_stop(ce, 0);
return 0;
@@ -111,7 +106,7 @@ static int sun5i_clkevt_shutdown(struct clock_event_device *clkevt)
static int sun5i_clkevt_set_oneshot(struct clock_event_device *clkevt)
{
- struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
+ struct sun5i_timer *ce = clkevt_to_sun5i_timer(clkevt);
sun5i_clkevt_time_stop(ce, 0);
sun5i_clkevt_time_start(ce, 0, false);
@@ -120,7 +115,7 @@ static int sun5i_clkevt_set_oneshot(struct clock_event_device *clkevt)
static int sun5i_clkevt_set_periodic(struct clock_event_device *clkevt)
{
- struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
+ struct sun5i_timer *ce = clkevt_to_sun5i_timer(clkevt);
sun5i_clkevt_time_stop(ce, 0);
sun5i_clkevt_time_setup(ce, 0, ce->timer.ticks_per_jiffy);
@@ -131,7 +126,7 @@ static int sun5i_clkevt_set_periodic(struct clock_event_device *clkevt)
static int sun5i_clkevt_next_event(unsigned long evt,
struct clock_event_device *clkevt)
{
- struct sun5i_timer_clkevt *ce = to_sun5i_timer_clkevt(clkevt);
+ struct sun5i_timer *ce = clkevt_to_sun5i_timer(clkevt);
sun5i_clkevt_time_stop(ce, 0);
sun5i_clkevt_time_setup(ce, 0, evt - TIMER_SYNC_TICKS);
@@ -142,7 +137,7 @@ static int sun5i_clkevt_next_event(unsigned long evt,
static irqreturn_t sun5i_timer_interrupt(int irq, void *dev_id)
{
- struct sun5i_timer_clkevt *ce = dev_id;
+ struct sun5i_timer *ce = dev_id;
writel(0x1, ce->timer.base + TIMER_IRQ_ST_REG);
ce->clkevt.event_handler(&ce->clkevt);
@@ -152,17 +147,16 @@ static irqreturn_t sun5i_timer_interrupt(int irq, void *dev_id)
static u64 sun5i_clksrc_read(struct clocksource *clksrc)
{
- struct sun5i_timer_clksrc *cs = to_sun5i_timer_clksrc(clksrc);
+ struct sun5i_timer *cs = clksrc_to_sun5i_timer(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)
+static int sun5i_rate_cb(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);
+ struct sun5i_timer *cs = nb_to_sun5i_timer(nb);
switch (event) {
case PRE_RATE_CHANGE:
@@ -171,6 +165,8 @@ static int sun5i_rate_cb_clksrc(struct notifier_block *nb,
case POST_RATE_CHANGE:
clocksource_register_hz(&cs->clksrc, ndata->new_rate);
+ clockevents_update_freq(&cs->clkevt, ndata->new_rate);
+ cs->timer.ticks_per_jiffy = DIV_ROUND_UP(ndata->new_rate, HZ);
break;
default:
@@ -181,41 +177,12 @@ static int sun5i_rate_cb_clksrc(struct notifier_block *nb,
}
static int __init sun5i_setup_clocksource(struct device_node *node,
- void __iomem *base,
- struct clk *clk, int irq)
+ struct sun5i_timer *cs,
+ unsigned long rate)
{
- struct sun5i_timer_clksrc *cs;
- unsigned long rate;
+ void __iomem *base = cs->timer.base;
int ret;
- cs = kzalloc(sizeof(*cs), GFP_KERNEL);
- if (!cs)
- return -ENOMEM;
-
- ret = clk_prepare_enable(clk);
- if (ret) {
- pr_err("Couldn't enable parent clock\n");
- goto err_free;
- }
-
- rate = clk_get_rate(clk);
- if (!rate) {
- pr_err("Couldn't get parent clock rate\n");
- ret = -EINVAL;
- goto err_disable_clk;
- }
-
- 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,
base + TIMER_CTL_REG(1));
@@ -229,72 +196,20 @@ 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_remove_notifier;
+ return ret;
}
return 0;
-
-err_remove_notifier:
- clk_notifier_unregister(clk, &cs->timer.clk_rate_cb);
-err_disable_clk:
- clk_disable_unprepare(clk);
-err_free:
- kfree(cs);
- 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)
+static int __init sun5i_setup_clockevent(struct device_node *node,
+ struct sun5i_timer *ce,
+ unsigned long rate, int irq)
{
- struct sun5i_timer_clkevt *ce;
- unsigned long rate;
+ void __iomem *base = ce->timer.base;
int ret;
u32 val;
- ce = kzalloc(sizeof(*ce), GFP_KERNEL);
- if (!ce)
- return -ENOMEM;
-
- ret = clk_prepare_enable(clk);
- if (ret) {
- pr_err("Couldn't enable parent clock\n");
- goto err_free;
- }
-
- rate = clk_get_rate(clk);
- if (!rate) {
- pr_err("Couldn't get parent clock rate\n");
- ret = -EINVAL;
- goto err_disable_clk;
- }
-
- 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;
ce->clkevt.set_next_event = sun5i_clkevt_next_event;
@@ -317,27 +232,25 @@ 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_remove_notifier;
+ return ret;
}
return 0;
-
-err_remove_notifier:
- clk_notifier_unregister(clk, &ce->timer.clk_rate_cb);
-err_disable_clk:
- clk_disable_unprepare(clk);
-err_free:
- kfree(ce);
- return ret;
}
static int __init sun5i_timer_init(struct device_node *node)
{
+ struct sun5i_timer *st;
struct reset_control *rstc;
void __iomem *timer_base;
struct clk *clk;
+ unsigned long rate;
int irq, ret;
+ st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (!st)
+ return -ENOMEM;
+
timer_base = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(timer_base)) {
pr_err("Can't map registers\n");
@@ -356,15 +269,48 @@ static int __init sun5i_timer_init(struct device_node *node)
return PTR_ERR(clk);
}
+ ret = clk_prepare_enable(clk);
+ if (ret) {
+ pr_err("Couldn't enable parent clock\n");
+ goto err_free;
+ }
+
+ rate = clk_get_rate(clk);
+ if (!rate) {
+ pr_err("Couldn't get parent clock rate\n");
+ ret = -EINVAL;
+ goto err_disable_clk;
+ }
+
+ st->timer.base = timer_base;
+ st->timer.ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);
+ st->timer.clk = clk;
+ st->timer.clk_rate_cb.notifier_call = sun5i_rate_cb;
+ st->timer.clk_rate_cb.next = NULL;
+
+ ret = clk_notifier_register(clk, &st->timer.clk_rate_cb);
+ if (ret) {
+ pr_err("Unable to register clock notifier.\n");
+ goto err_disable_clk;
+ }
+
rstc = of_reset_control_get(node, NULL);
if (!IS_ERR(rstc))
reset_control_deassert(rstc);
- ret = sun5i_setup_clocksource(node, timer_base, clk, irq);
+ ret = sun5i_setup_clocksource(node, st, rate);
if (ret)
- return ret;
+ goto err_remove_notifier;
- return sun5i_setup_clockevent(node, timer_base, clk, irq);
+ return sun5i_setup_clockevent(node, st, rate, irq);
+
+err_remove_notifier:
+ clk_notifier_unregister(clk, &st->timer.clk_rate_cb);
+err_disable_clk:
+ clk_disable_unprepare(clk);
+err_free:
+ kfree(st);
+ return ret;
}
TIMER_OF_DECLARE(sun5i_a13, "allwinner,sun5i-a13-hstimer",
sun5i_timer_init);
--
2.41.0
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