[PATCH 05/14] clocksource/drivers/timer-milbeaut: Add Milbeaut M10V timer

[Sugaya Taichi]

Add Milbeaut M10V timer using 32bit timer in peripheral.

Signed-off-by: Sugaya Taichi <sugaya.taichi@xxxxxxxxxxxxx>
---
 drivers/clocksource/Kconfig      |   8 +++
 drivers/clocksource/Makefile     |   1 +
 drivers/clocksource/timer-m10v.c | 146 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 155 insertions(+)
 create mode 100644 drivers/clocksource/timer-m10v.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 55c77e4..a278d72 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -638,4 +638,12 @@ config GX6605S_TIMER
 	help
 	  This option enables support for gx6605s SOC's timer.
 
+config M10V_TIMER
+	bool "Milbeaut M10V timer driver" if COMPILE_TEST
+	depends on OF
+	depends on ARM
+	select TIMER_OF
+	help
+	  Enables the support for Milbeaut M10V timer driver.
+
 endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index dd91381..8e908b4 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_CLKSRC_TI_32K)	+= timer-ti-32k.o
 obj-$(CONFIG_CLKSRC_NPS)	+= timer-nps.o
 obj-$(CONFIG_OXNAS_RPS_TIMER)	+= timer-oxnas-rps.o
 obj-$(CONFIG_OWL_TIMER)		+= timer-owl.o
+obj-$(CONFIG_M10V_TIMER)	+= timer-m10v.o
 obj-$(CONFIG_SPRD_TIMER)	+= timer-sprd.o
 obj-$(CONFIG_NPCM7XX_TIMER)	+= timer-npcm7xx.o
 
diff --git a/drivers/clocksource/timer-m10v.c b/drivers/clocksource/timer-m10v.c
new file mode 100644
index 0000000..ff97c23
--- /dev/null
+++ b/drivers/clocksource/timer-m10v.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Socionext Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqreturn.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/slab.h>
+#include "timer-of.h"
+
+#define FSL_TMR_TMCSR_OFS	0x0
+#define FSL_TMR_TMR_OFS		0x4
+#define FSL_TMR_TMRLR1_OFS	0x8
+#define FSL_TMR_TMRLR2_OFS	0xc
+#define FSL_RMT_REGSZPCH	0x10
+
+#define FSL_TMR_TMCSR_OUTL	BIT(5)
+#define FSL_TMR_TMCSR_RELD	BIT(4)
+#define FSL_TMR_TMCSR_INTE	BIT(3)
+#define FSL_TMR_TMCSR_UF	BIT(2)
+#define FSL_TMR_TMCSR_CNTE	BIT(1)
+#define FSL_TMR_TMCSR_TRG	BIT(0)
+
+#define FSL_TMR_TMCSR_CSL_DIV2	0
+#define FSL_TMR_TMCSR_CSL	BIT(10)
+
+#define M10V_TIMER_RATING	500
+
+static irqreturn_t m10v_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *clk = dev_id;
+	struct timer_of *to = to_timer_of(clk);
+	u32 val;
+
+	val = readl_relaxed(timer_of_base(to) + FSL_TMR_TMCSR_OFS);
+	val &= ~FSL_TMR_TMCSR_UF;
+	writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
+
+	clk->event_handler(clk);
+
+	return IRQ_HANDLED;
+}
+
+static int m10v_set_state_periodic(struct clock_event_device *clk)
+{
+	struct timer_of *to = to_timer_of(clk);
+	u32 val = (FSL_TMR_TMCSR_CSL_DIV2 * FSL_TMR_TMCSR_CSL);
+
+	writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
+
+	writel_relaxed(to->of_clk.period, timer_of_base(to) +
+				FSL_TMR_TMRLR1_OFS);
+	val |= FSL_TMR_TMCSR_RELD | FSL_TMR_TMCSR_CNTE |
+		FSL_TMR_TMCSR_TRG | FSL_TMR_TMCSR_INTE;
+	writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
+	return 0;
+}
+
+static int m10v_set_state_oneshot(struct clock_event_device *clk)
+{
+	struct timer_of *to = to_timer_of(clk);
+	u32 val = (FSL_TMR_TMCSR_CSL_DIV2 * FSL_TMR_TMCSR_CSL);
+
+	writel_relaxed(val, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
+	return 0;
+}
+
+static int m10v_clkevt_next_event(unsigned long event,
+				   struct clock_event_device *clk)
+{
+	struct timer_of *to = to_timer_of(clk);
+
+	writel_relaxed(event, timer_of_base(to) + FSL_TMR_TMRLR1_OFS);
+	writel_relaxed((FSL_TMR_TMCSR_CSL_DIV2 * FSL_TMR_TMCSR_CSL) |
+			FSL_TMR_TMCSR_CNTE | FSL_TMR_TMCSR_INTE |
+			FSL_TMR_TMCSR_TRG, timer_of_base(to) +
+			FSL_TMR_TMCSR_OFS);
+	return 0;
+}
+
+static int m10v_config_clock_source(struct timer_of *to)
+{
+	writel_relaxed(0, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
+	writel_relaxed(~0, timer_of_base(to) + FSL_TMR_TMR_OFS);
+	writel_relaxed(~0, timer_of_base(to) + FSL_TMR_TMRLR1_OFS);
+	writel_relaxed(~0, timer_of_base(to) + FSL_TMR_TMRLR2_OFS);
+	writel_relaxed(BIT(4) | BIT(1) | BIT(0), timer_of_base(to) +
+		FSL_TMR_TMCSR_OFS);
+	return 0;
+}
+
+static int m10v_config_clock_event(struct timer_of *to)
+{
+	writel_relaxed(0, timer_of_base(to) + FSL_TMR_TMCSR_OFS);
+	return 0;
+}
+
+static struct timer_of to = {
+	.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
+
+	.clkevt = {
+		.name = "m10v-clkevt",
+		.rating = M10V_TIMER_RATING,
+		.cpumask = cpu_possible_mask,
+	},
+
+	.of_irq = {
+		.flags = IRQF_TIMER | IRQF_IRQPOLL,
+	},
+};
+
+static int __init m10v_timer_init(struct device_node *node)
+{
+	int ret;
+
+	to.clkevt.features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_ONESHOT;
+	to.clkevt.set_state_oneshot = m10v_set_state_oneshot;
+	to.clkevt.set_state_periodic = m10v_set_state_periodic;
+	to.clkevt.set_next_event = m10v_clkevt_next_event;
+	to.of_irq.handler = m10v_timer_interrupt;
+
+	ret = timer_of_init(node, &to);
+	if (ret)
+		goto err;
+
+	m10v_config_clock_source(&to);
+	clocksource_mmio_init(timer_of_base(&to) + FSL_TMR_TMR_OFS,
+		node->name, timer_of_rate(&to), M10V_TIMER_RATING, 32,
+		clocksource_mmio_readl_down);
+	m10v_config_clock_event(&to);
+	clockevents_config_and_register(&to.clkevt, timer_of_rate(&to),
+				15, 0xffffffff);
+
+	return 0;
+err:
+	timer_of_cleanup(&to);
+	return ret;
+}
+TIMER_OF_DECLARE(m10v_peritimer, "socionext,milbeaut-m10v-timer",
+		m10v_timer_init);
-- 
1.9.1