Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 211 insertions, 0 deletions

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
new file mode 100644
index 000000000..47114c2a7
--- /dev/null
+++ b/drivers/clocksource/h8300_timer8.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/arch/h8300/kernel/cpu/timer/timer8.c
+ *
+ *  Yoshinori Sato <ysato@users.sourcefoge.jp>
+ *
+ *  8bit Timer driver
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/clockchips.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#define _8TCR	0
+#define _8TCSR	2
+#define TCORA	4
+#define TCORB	6
+#define _8TCNT	8
+
+#define CMIEA	6
+#define CMFA	6
+
+#define FLAG_STARTED (1 << 3)
+
+#define SCALE 64
+
+#define bset(b, a) iowrite8(ioread8(a) | (1 << (b)), (a))
+#define bclr(b, a) iowrite8(ioread8(a) & ~(1 << (b)), (a))
+
+struct timer8_priv {
+	struct clock_event_device ced;
+	void __iomem *mapbase;
+	unsigned long flags;
+	unsigned int rate;
+};
+
+static irqreturn_t timer8_interrupt(int irq, void *dev_id)
+{
+	struct timer8_priv *p = dev_id;
+
+	if (clockevent_state_oneshot(&p->ced))
+		iowrite16be(0x0000, p->mapbase + _8TCR);
+
+	p->ced.event_handler(&p->ced);
+
+	bclr(CMFA, p->mapbase + _8TCSR);
+
+	return IRQ_HANDLED;
+}
+
+static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
+{
+	if (delta >= 0x10000)
+		pr_warn("delta out of range\n");
+	bclr(CMIEA, p->mapbase + _8TCR);
+	iowrite16be(delta, p->mapbase + TCORA);
+	iowrite16be(0x0000, p->mapbase + _8TCNT);
+	bclr(CMFA, p->mapbase + _8TCSR);
+	bset(CMIEA, p->mapbase + _8TCR);
+}
+
+static int timer8_enable(struct timer8_priv *p)
+{
+	iowrite16be(0xffff, p->mapbase + TCORA);
+	iowrite16be(0x0000, p->mapbase + _8TCNT);
+	iowrite16be(0x0c02, p->mapbase + _8TCR);
+
+	return 0;
+}
+
+static int timer8_start(struct timer8_priv *p)
+{
+	int ret;
+
+	if ((p->flags & FLAG_STARTED))
+		return 0;
+
+	ret = timer8_enable(p);
+	if (!ret)
+		p->flags |= FLAG_STARTED;
+
+	return ret;
+}
+
+static void timer8_stop(struct timer8_priv *p)
+{
+	iowrite16be(0x0000, p->mapbase + _8TCR);
+}
+
+static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
+{
+	return container_of(ced, struct timer8_priv, ced);
+}
+
+static void timer8_clock_event_start(struct timer8_priv *p, unsigned long delta)
+{
+	timer8_start(p);
+	timer8_set_next(p, delta);
+}
+
+static int timer8_clock_event_shutdown(struct clock_event_device *ced)
+{
+	timer8_stop(ced_to_priv(ced));
+	return 0;
+}
+
+static int timer8_clock_event_periodic(struct clock_event_device *ced)
+{
+	struct timer8_priv *p = ced_to_priv(ced);
+
+	pr_info("%s: used for periodic clock events\n", ced->name);
+	timer8_stop(p);
+	timer8_clock_event_start(p, (p->rate + HZ/2) / HZ);
+
+	return 0;
+}
+
+static int timer8_clock_event_oneshot(struct clock_event_device *ced)
+{
+	struct timer8_priv *p = ced_to_priv(ced);
+
+	pr_info("%s: used for oneshot clock events\n", ced->name);
+	timer8_stop(p);
+	timer8_clock_event_start(p, 0x10000);
+
+	return 0;
+}
+
+static int timer8_clock_event_next(unsigned long delta,
+				   struct clock_event_device *ced)
+{
+	struct timer8_priv *p = ced_to_priv(ced);
+
+	BUG_ON(!clockevent_state_oneshot(ced));
+	timer8_set_next(p, delta - 1);
+
+	return 0;
+}
+
+static struct timer8_priv timer8_priv = {
+	.ced = {
+		.name = "h8300_8timer",
+		.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+		.rating = 200,
+		.set_next_event = timer8_clock_event_next,
+		.set_state_shutdown = timer8_clock_event_shutdown,
+		.set_state_periodic = timer8_clock_event_periodic,
+		.set_state_oneshot = timer8_clock_event_oneshot,
+	},
+};
+
+static int __init h8300_8timer_init(struct device_node *node)
+{
+	void __iomem *base;
+	int irq, ret;
+	struct clk *clk;
+
+	clk = of_clk_get(node, 0);
+	if (IS_ERR(clk)) {
+		pr_err("failed to get clock for clockevent\n");
+		return PTR_ERR(clk);
+	}
+
+	ret = -ENXIO;
+	base = of_iomap(node, 0);
+	if (!base) {
+		pr_err("failed to map registers for clockevent\n");
+		goto free_clk;
+	}
+
+	ret = -EINVAL;
+	irq = irq_of_parse_and_map(node, 0);
+	if (!irq) {
+		pr_err("failed to get irq for clockevent\n");
+		goto unmap_reg;
+	}
+
+	timer8_priv.mapbase = base;
+
+	timer8_priv.rate = clk_get_rate(clk) / SCALE;
+	if (!timer8_priv.rate) {
+		pr_err("Failed to get rate for the clocksource\n");
+		goto unmap_reg;
+	}
+
+	if (request_irq(irq, timer8_interrupt, IRQF_TIMER,
+			timer8_priv.ced.name, &timer8_priv) < 0) {
+		pr_err("failed to request irq %d for clockevent\n", irq);
+		goto unmap_reg;
+	}
+
+	clockevents_config_and_register(&timer8_priv.ced,
+					timer8_priv.rate, 1, 0x0000ffff);
+
+	return 0;
+unmap_reg:
+	iounmap(base);
+free_clk:
+	clk_put(clk);
+	return ret;
+}
+
+TIMER_OF_DECLARE(h8300_8bit, "renesas,8bit-timer", h8300_8timer_init);