[DO NOT MERGE v5 08/37] clocksource: sh_tmu: CLOCKSOURCE support.

Yoshinori Sato
2023-12-05T10:12:47Z

Allows initialization as CLOCKSOURCE.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
drivers/clocksource/sh_tmu.c | 161 +++++++++++++++++++++++------------
1 file changed, 106 insertions(+), 55 deletions(-)

diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index beffff81c00f..e4ae83c9f7d4 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -17,6 +17,8 @@
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
@@ -65,6 +67,7 @@ struct sh_tmu_device {

bool has_clockevent;
bool has_clocksource;
+ const char *name;
};

#define TSTR -1 /* shared register */
@@ -148,8 +151,8 @@ static int __sh_tmu_enable(struct sh_tmu_channel *ch)
/* enable clock */
ret = clk_enable(ch->tmu->clk);
if (ret) {
- dev_err(&ch->tmu->pdev->dev, "ch%u: cannot enable clock\n",
- ch->index);
+ pr_err("%s ch%u: cannot enable clock\n",
+ ch->tmu->name, ch->index);
return ret;
}

@@ -174,9 +177,10 @@ static int sh_tmu_enable(struct sh_tmu_channel *ch)
if (ch->enable_count++ > 0)
return 0;

- pm_runtime_get_sync(&ch->tmu->pdev->dev);
- dev_pm_syscore_device(&ch->tmu->pdev->dev, true);
-
+ if (ch->tmu->pdev) {
+ pm_runtime_get_sync(&ch->tmu->pdev->dev);
+ dev_pm_syscore_device(&ch->tmu->pdev->dev, true);
+ }
return __sh_tmu_enable(ch);
}

@@ -202,8 +206,10 @@ static void sh_tmu_disable(struct sh_tmu_channel *ch)

__sh_tmu_disable(ch);

- dev_pm_syscore_device(&ch->tmu->pdev->dev, false);
- pm_runtime_put(&ch->tmu->pdev->dev);
+ if (ch->tmu->pdev) {
+ dev_pm_syscore_device(&ch->tmu->pdev->dev, false);
+ pm_runtime_put(&ch->tmu->pdev->dev);
+ }
}

static void sh_tmu_set_next(struct sh_tmu_channel *ch, unsigned long delta,
@@ -245,7 +251,7 @@ static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

-static struct sh_tmu_channel *cs_to_sh_tmu(struct clocksource *cs)
+static inline struct sh_tmu_channel *cs_to_sh_tmu(struct clocksource *cs)
{
return container_of(cs, struct sh_tmu_channel, cs);
}
@@ -292,7 +298,8 @@ static void sh_tmu_clocksource_suspend(struct clocksource *cs)

if (--ch->enable_count == 0) {
__sh_tmu_disable(ch);
- dev_pm_genpd_suspend(&ch->tmu->pdev->dev);
+ if (ch->tmu->pdev)
+ dev_pm_genpd_suspend(&ch->tmu->pdev->dev);
}
}

@@ -304,7 +311,8 @@ static void sh_tmu_clocksource_resume(struct clocksource *cs)
return;

if (ch->enable_count++ == 0) {
- dev_pm_genpd_resume(&ch->tmu->pdev->dev);
+ if (ch->tmu->pdev)
+ dev_pm_genpd_resume(&ch->tmu->pdev->dev);
__sh_tmu_enable(ch);
}
}
@@ -324,14 +332,14 @@ static int sh_tmu_register_clocksource(struct sh_tmu_channel *ch,
cs->mask = CLOCKSOURCE_MASK(32);
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;

- dev_info(&ch->tmu->pdev->dev, "ch%u: used as clock source\n",
- ch->index);
+ pr_info("%s ch%u: used as clock source\n",
+ ch->tmu->name, ch->index);

clocksource_register_hz(cs, ch->tmu->rate);
return 0;
}

-static struct sh_tmu_channel *ced_to_sh_tmu(struct clock_event_device *ced)
+static inline struct sh_tmu_channel *ced_to_sh_tmu(struct clock_event_device *ced)
{
return container_of(ced, struct sh_tmu_channel, ced);
}
@@ -364,8 +372,8 @@ static int sh_tmu_clock_event_set_state(struct clock_event_device *ced,
if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
sh_tmu_disable(ch);

- dev_info(&ch->tmu->pdev->dev, "ch%u: used for %s clock events\n",
- ch->index, periodic ? "periodic" : "oneshot");
+ pr_info("%s ch%u: used for %s clock events\n",
+ ch->tmu->name, ch->index, periodic ? "periodic" : "oneshot");
sh_tmu_clock_event_start(ch, periodic);
return 0;
}
@@ -403,7 +411,8 @@ static void sh_tmu_clock_event_resume(struct clock_event_device *ced)
}

static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch,
- const char *name)
+ const char *name,
+ struct device_node *np)
{
struct clock_event_device *ced = &ch->ced;
int ret;
@@ -417,30 +426,32 @@ static void sh_tmu_register_clockevent(struct sh_tmu_channel *ch,
ced->set_state_shutdown = sh_tmu_clock_event_shutdown;
ced->set_state_periodic = sh_tmu_clock_event_set_periodic;
ced->set_state_oneshot = sh_tmu_clock_event_set_oneshot;
- ced->suspend = sh_tmu_clock_event_suspend;
- ced->resume = sh_tmu_clock_event_resume;
-
- dev_info(&ch->tmu->pdev->dev, "ch%u: used for clock events\n",
- ch->index);
+ if (ch->tmu->pdev) {
+ ced->suspend = sh_tmu_clock_event_suspend;
+ ced->resume = sh_tmu_clock_event_resume;
+ }
+ pr_info("%s ch%u: used for clock events\n",
+ ch->tmu->name, ch->index);

clockevents_config_and_register(ced, ch->tmu->rate, 0x300, 0xffffffff);

ret = request_irq(ch->irq, sh_tmu_interrupt,
IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING,
- dev_name(&ch->tmu->pdev->dev), ch);
+ ch->tmu->name, ch);
if (ret) {
- dev_err(&ch->tmu->pdev->dev, "ch%u: failed to request irq %d\n",
- ch->index, ch->irq);
+ pr_err("%s ch%u: failed to request irq %d\n",
+ ch->tmu->name, ch->index, ch->irq);
return;
}
}

static int sh_tmu_register(struct sh_tmu_channel *ch, const char *name,
+ struct device_node *np,
bool clockevent, bool clocksource)
{
if (clockevent) {
ch->tmu->has_clockevent = true;
- sh_tmu_register_clockevent(ch, name);
+ sh_tmu_register_clockevent(ch, name, np);
} else if (clocksource) {
ch->tmu->has_clocksource = true;
sh_tmu_register_clocksource(ch, name);
@@ -451,7 +462,8 @@ static int sh_tmu_register(struct sh_tmu_channel *ch, const char *name,

static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, unsigned int index,
bool clockevent, bool clocksource,
- struct sh_tmu_device *tmu)
+ struct sh_tmu_device *tmu,
+ struct device_node *np)
{
/* Skip unused channels. */
if (!clockevent && !clocksource)
@@ -465,53 +477,59 @@ static int sh_tmu_channel_setup(struct sh_tmu_channel *ch, unsigned int index,
else
ch->base = tmu->mapbase + 8 + ch->index * 12;

- ch->irq = platform_get_irq(tmu->pdev, index);
+ if (tmu->pdev)
+ ch->irq = platform_get_irq(tmu->pdev, index);
+ else
+ ch->irq = of_irq_get(np, index);
if (ch->irq < 0)
return ch->irq;

ch->cs_enabled = false;
ch->enable_count = 0;

- return sh_tmu_register(ch, dev_name(&tmu->pdev->dev),
+ return sh_tmu_register(ch, tmu->name, np,
clockevent, clocksource);
}

-static int sh_tmu_map_memory(struct sh_tmu_device *tmu)
+static int sh_tmu_map_memory(struct sh_tmu_device *tmu, struct device_node *np)
{
struct resource *res;

- res = platform_get_resource(tmu->pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&tmu->pdev->dev, "failed to get I/O memory\n");
- return -ENXIO;
- }
+ if (tmu->pdev) {
+ res = platform_get_resource(tmu->pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ pr_err("sh_tmu failed to get I/O memory\n");
+ return -ENXIO;
+ }
+
+ tmu->mapbase = ioremap(res->start, resource_size(res));
+ } else
+ tmu->mapbase = of_iomap(np, 0);

- tmu->mapbase = ioremap(res->start, resource_size(res));
if (tmu->mapbase == NULL)
return -ENXIO;

return 0;
}

-static int sh_tmu_parse_dt(struct sh_tmu_device *tmu)
+static int sh_tmu_parse_dt(struct sh_tmu_device *tmu, struct device_node *np)
{
- struct device_node *np = tmu->pdev->dev.of_node;
-
tmu->model = SH_TMU;
tmu->num_channels = 3;

of_property_read_u32(np, "#renesas,channels", &tmu->num_channels);

if (tmu->num_channels != 2 && tmu->num_channels != 3) {
- dev_err(&tmu->pdev->dev, "invalid number of channels %u\n",
- tmu->num_channels);
+ pr_err("%s: invalid number of channels %u\n",
+ tmu->name, tmu->num_channels);
return -EINVAL;
}

return 0;
}

-static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
+static int sh_tmu_setup(struct sh_tmu_device *tmu,
+ struct platform_device *pdev, struct device_node *np)
{
unsigned int i;
int ret;
@@ -520,8 +538,13 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)

raw_spin_lock_init(&tmu->lock);

- if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
- ret = sh_tmu_parse_dt(tmu);
+ if (pdev)
+ tmu->name = dev_name(&pdev->dev);
+ else
+ tmu->name = of_node_full_name(np);
+
+ if (IS_ENABLED(CONFIG_OF) && np) {
+ ret = sh_tmu_parse_dt(tmu, np);
if (ret < 0)
return ret;
} else if (pdev->dev.platform_data) {
@@ -531,14 +554,17 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
tmu->model = id->driver_data;
tmu->num_channels = hweight8(cfg->channels_mask);
} else {
- dev_err(&tmu->pdev->dev, "missing platform data\n");
+ pr_err("%s missing platform data\n", tmu->name);
return -ENXIO;
}

/* Get hold of clock. */
- tmu->clk = clk_get(&tmu->pdev->dev, "fck");
+ if (pdev)
+ tmu->clk = clk_get(&tmu->pdev->dev, "fck");
+ else
+ tmu->clk = of_clk_get(np, 0);
if (IS_ERR(tmu->clk)) {
- dev_err(&tmu->pdev->dev, "cannot get clock\n");
+ pr_err("%s: cannot get clock\n", tmu->name);
return PTR_ERR(tmu->clk);
}

@@ -555,9 +581,9 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
clk_disable(tmu->clk);

/* Map the memory resource. */
- ret = sh_tmu_map_memory(tmu);
+ ret = sh_tmu_map_memory(tmu, np);
if (ret < 0) {
- dev_err(&tmu->pdev->dev, "failed to remap I/O memory\n");
+ pr_err("%s: failed to remap I/O memory\n", tmu->name);
goto err_clk_unprepare;
}

@@ -575,12 +601,12 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
*/
for (i = 0; i < tmu->num_channels; ++i) {
ret = sh_tmu_channel_setup(&tmu->channels[i], i,
- i == 0, i == 1, tmu);
+ i == 0, i == 1, tmu, np);
if (ret < 0)
goto err_unmap;
}
-
- platform_set_drvdata(pdev, tmu);
+ if (pdev)
+ platform_set_drvdata(pdev, tmu);

return 0;

@@ -594,6 +620,7 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
return ret;
}

+#ifndef CONFIG_SH_DEVICE_TREE
static int sh_tmu_probe(struct platform_device *pdev)
{
struct sh_tmu_device *tmu = platform_get_drvdata(pdev);
@@ -613,7 +640,7 @@ static int sh_tmu_probe(struct platform_device *pdev)
if (tmu == NULL)
return -ENOMEM;

- ret = sh_tmu_setup(tmu, pdev);
+ ret = sh_tmu_setup(tmu, pdev, pdev->dev.of_node);
if (ret) {
kfree(tmu);
pm_runtime_idle(&pdev->dev);
@@ -631,7 +658,26 @@ static int sh_tmu_probe(struct platform_device *pdev)

return 0;
}
+#else
+static int __init sh_tmu_of_register(struct device_node *np)
+{
+ struct sh_tmu_device *tmu;
+ int ret;
+
+ tmu = kzalloc(sizeof(*tmu), GFP_KERNEL);
+ if (tmu == NULL)
+ return -ENOMEM;
+
+ ret = sh_tmu_setup(tmu, NULL, np);
+ if (ret) {
+ kfree(tmu);
+ pr_warn("%pOF: Timer register failed (%d)", np, ret);
+ }
+ return ret;
+}
+#endif

+#ifndef CONFIG_SH_DEVICE_TREE
static const struct platform_device_id sh_tmu_id_table[] = {
{ "sh-tmu", SH_TMU },
{ "sh-tmu-sh3", SH_TMU_SH3 },
@@ -665,12 +711,17 @@ static void __exit sh_tmu_exit(void)
platform_driver_unregister(&sh_tmu_device_driver);
}

+subsys_initcall(sh_tmu_init);
+module_exit(sh_tmu_exit);
+#endif
+
#ifdef CONFIG_SUPERH
+#ifdef CONFIG_SH_DEVICE_TREE
+TIMER_OF_DECLARE(sh_tmu, "renesas,tmu", sh_tmu_of_register);
+#else
sh_early_platform_init("earlytimer", &sh_tmu_device_driver);
#endif
-
-subsys_initcall(sh_tmu_init);
-module_exit(sh_tmu_exit);
+#endif

MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("SuperH TMU Timer Driver");
--
2.39.2