[PATCH v7 08/37] clocksource: sh_tmu: CLOCKSOURCE support.

From: Yoshinori Sato
Date: Thu Apr 04 2024 - 01:01:52 EST

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Allows initialization as CLOCKSOURCE.

Signed-off-by: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
---
drivers/clocksource/sh_tmu.c | 198 ++++++++++++++++++++++++-----------
1 file changed, 134 insertions(+), 64 deletions(-)

diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index beffff81c00f..59f9da7fd987 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>
@@ -51,6 +53,7 @@ struct sh_tmu_channel {

struct sh_tmu_device {
struct platform_device *pdev;
+ struct device_node *np;

void __iomem *mapbase;
struct clk *clk;
@@ -65,6 +68,7 @@ struct sh_tmu_device {

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

#define TSTR -1 /* shared register */
@@ -148,8 +152,8 @@ 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 +178,10 @@ 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 +207,10 @@ 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 +252,7 @@ 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 +299,8 @@ 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 +312,8 @@ 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 +333,14 @@ 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 +373,8 @@ 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;
}
@@ -417,20 +426,22 @@ 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;
+ if (ch->tmu->pdev) {
+ 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);
+ 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;
}
}
@@ -465,28 +476,36 @@ 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);
+ if (tmu->np)
+ ch->irq = of_irq_get(tmu->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),
- clockevent, clocksource);
+ return sh_tmu_register(ch, tmu->name, clockevent, clocksource);
}

static int sh_tmu_map_memory(struct sh_tmu_device *tmu)
{
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));
}
+ if (tmu->np)
+ tmu->mapbase = of_iomap(tmu->np, 0);

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

@@ -495,7 +514,12 @@ static int sh_tmu_map_memory(struct sh_tmu_device *tmu)

static int sh_tmu_parse_dt(struct sh_tmu_device *tmu)
{
- struct device_node *np = tmu->pdev->dev.of_node;
+ struct device_node *np;
+
+ if (tmu->pdev)
+ np = tmu->pdev->dev.of_node;
+ if (tmu->np)
+ np = tmu->np;

tmu->model = SH_TMU;
tmu->num_channels = 3;
@@ -503,45 +527,19 @@ static int sh_tmu_parse_dt(struct sh_tmu_device *tmu)
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)
{
unsigned int i;
int ret;

- tmu->pdev = pdev;
-
- raw_spin_lock_init(&tmu->lock);
-
- if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
- ret = sh_tmu_parse_dt(tmu);
- if (ret < 0)
- return ret;
- } else if (pdev->dev.platform_data) {
- const struct platform_device_id *id = pdev->id_entry;
- struct sh_timer_config *cfg = pdev->dev.platform_data;
-
- tmu->model = id->driver_data;
- tmu->num_channels = hweight8(cfg->channels_mask);
- } else {
- dev_err(&tmu->pdev->dev, "missing platform data\n");
- return -ENXIO;
- }
-
- /* Get hold of clock. */
- tmu->clk = clk_get(&tmu->pdev->dev, "fck");
- if (IS_ERR(tmu->clk)) {
- dev_err(&tmu->pdev->dev, "cannot get clock\n");
- return PTR_ERR(tmu->clk);
- }
-
ret = clk_prepare(tmu->clk);
if (ret < 0)
goto err_clk_put;
@@ -557,7 +555,7 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
/* Map the memory resource. */
ret = sh_tmu_map_memory(tmu);
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;
}

@@ -580,8 +578,6 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
goto err_unmap;
}

- platform_set_drvdata(pdev, tmu);
-
return 0;

err_unmap:
@@ -594,6 +590,39 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
return ret;
}

+static int sh_tmu_setup_pdev(struct sh_tmu_device *tmu, struct platform_device *pdev)
+{
+ int ret;
+
+ tmu->pdev = pdev;
+
+ raw_spin_lock_init(&tmu->lock);
+
+ if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+ ret = sh_tmu_parse_dt(tmu);
+ if (ret < 0)
+ return ret;
+ } else if (pdev->dev.platform_data) {
+ const struct platform_device_id *id = pdev->id_entry;
+ struct sh_timer_config *cfg = pdev->dev.platform_data;
+
+ tmu->model = id->driver_data;
+ tmu->num_channels = hweight8(cfg->channels_mask);
+ } else {
+ dev_err(&tmu->pdev->dev, "missing platform data\n");
+ return -ENXIO;
+ }
+
+ tmu->name = dev_name(&pdev->dev);
+ tmu->clk = clk_get(&tmu->pdev->dev, "fck");
+ if (IS_ERR(tmu->clk)) {
+ dev_err(&tmu->pdev->dev, "cannot get clock\n");
+ return PTR_ERR(tmu->clk);
+ }
+
+ return sh_tmu_setup(tmu);
+}
+
static int sh_tmu_probe(struct platform_device *pdev)
{
struct sh_tmu_device *tmu = platform_get_drvdata(pdev);
@@ -613,12 +642,13 @@ static int sh_tmu_probe(struct platform_device *pdev)
if (tmu == NULL)
return -ENOMEM;

- ret = sh_tmu_setup(tmu, pdev);
+ ret = sh_tmu_setup_pdev(tmu, pdev);
if (ret) {
kfree(tmu);
pm_runtime_idle(&pdev->dev);
return ret;
}
+ platform_set_drvdata(pdev, tmu);

if (is_sh_early_platform_device(pdev))
return 0;
@@ -632,6 +662,45 @@ static int sh_tmu_probe(struct platform_device *pdev)
return 0;
}

+static int sh_tmu_setup_of(struct sh_tmu_device *tmu, struct device_node *np)
+{
+ int ret;
+
+ tmu->np = np;
+ raw_spin_lock_init(&tmu->lock);
+
+ ret = sh_tmu_parse_dt(tmu);
+ if (ret < 0)
+ return ret;
+
+ tmu->clk = of_clk_get(np, 0);
+ tmu->name = of_node_full_name(np);
+
+ if (IS_ERR(tmu->clk)) {
+ pr_err("%pOF: cannot get clock\n", np);
+ return PTR_ERR(tmu->clk);
+ }
+
+ return sh_tmu_setup(tmu);
+}
+
+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_of(tmu, np);
+ if (ret) {
+ kfree(tmu);
+ pr_warn("%pOF: Timer register failed (%d)", np, ret);
+ }
+ return ret;
+}
+
static const struct platform_device_id sh_tmu_id_table[] = {
{ "sh-tmu", SH_TMU },
{ "sh-tmu-sh3", SH_TMU_SH3 },
@@ -665,6 +734,7 @@ static void __exit sh_tmu_exit(void)
platform_driver_unregister(&sh_tmu_device_driver);
}

+TIMER_OF_DECLARE(sh_tmu, "renesas,tmu", sh_tmu_of_register);
#ifdef CONFIG_SUPERH
sh_early_platform_init("earlytimer", &sh_tmu_device_driver);
#endif
--
2.39.2

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