[PATCH v2 00/12] ARM: davinci: modernize the timer support

[PATCH v2 00/12] ARM: davinci: modernize the timer support

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

This series removes the legacy timer code from mach-davinci in favor of
a new clocksource driver it introduces.

The first patch fixes a device tree bug that's been around for a while.
Unfortunately any systems shipped with the buggy device will stop booting
once they switch to the new clocksource driver.

Patch 2 adds a new clocksource driver for davinci.

Patch 3 enables the new driver for device-tree based systems.

Patch 4 adds a WARN_ON() to the machine code of all davinci boards
which is triggered if clk_get() for the timer clock fails. This is needed
as the new driver expects the clock to be functional and doesn't check it.

Patches 5-6 and 8-11 switch the board files to using the new
clocksource driver while patch 7 moves some necessary defines to
a different place since we'll be removing the file that contains them.

Patch 12 removes legacy timer code.

v1 -> v2:

- changed the license to GPL-only
- dropped regmap usage due to the additional code paths making the
  code too slow
- minor code rearrangement
- fixed the da830 timer configuration
- correctly assign the timer halfs to clocksource and clockevent
- sqashed the commits adding WARN() when clk_get() fails
- used WARN_ON() and added a return when clk_get() fails to avoid
  entering the timer driver without a valid clock
- request the register range before iomapping it
- simplified the configuration structure (dropped the additional cmp struct)

Bartosz Golaszewski (12):
  ARM: dts: da850: fix interrupt numbers for clocksource
  clocksource: davinci-timer: new driver
  ARM: davinci: enable the clocksource driver for DT mode
  ARM: davinci: WARN_ON() if clk_get() fails
  ARM: davinci: da850: switch to using the clocksource driver
  ARM: davinci: da830: switch to using the clocksource driver
  ARM: davinci: move timer definitions to davinci.h
  ARM: davinci: dm355: switch to using the clocksource driver
  ARM: davinci: dm365: switch to using the clocksource driver
  ARM: davinci: dm644x: switch to using the clocksource driver
  ARM: davinci: dm646x: switch to using the clocksource driver
  ARM: davinci: remove legacy timer support

 arch/arm/Kconfig                            |   1 +
 arch/arm/boot/dts/da850.dtsi                |   2 +-
 arch/arm/mach-davinci/Makefile              |   3 +-
 arch/arm/mach-davinci/da830.c               |  53 ++-
 arch/arm/mach-davinci/da850.c               |  60 ++-
 arch/arm/mach-davinci/davinci.h             |   3 +
 arch/arm/mach-davinci/devices-da8xx.c       |   1 -
 arch/arm/mach-davinci/devices.c             |  19 -
 arch/arm/mach-davinci/dm355.c               |  40 +-
 arch/arm/mach-davinci/dm365.c               |  34 +-
 arch/arm/mach-davinci/dm644x.c              |  40 +-
 arch/arm/mach-davinci/dm646x.c              |  40 +-
 arch/arm/mach-davinci/include/mach/common.h |  17 -
 arch/arm/mach-davinci/include/mach/time.h   |  35 --
 arch/arm/mach-davinci/time.c                | 414 -------------------
 drivers/clocksource/Kconfig                 |   5 +
 drivers/clocksource/Makefile                |   1 +
 drivers/clocksource/timer-davinci.c         | 431 ++++++++++++++++++++
 include/clocksource/timer-davinci.h         |  44 ++
 19 files changed, 647 insertions(+), 596 deletions(-)
 delete mode 100644 arch/arm/mach-davinci/include/mach/time.h
 delete mode 100644 arch/arm/mach-davinci/time.c
 create mode 100644 drivers/clocksource/timer-davinci.c
 create mode 100644 include/clocksource/timer-davinci.h

-- 
2.20.1

[PATCH v2 01/12] ARM: dts: da850: fix interrupt numbers for clocksource

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

The timer interrupts specified in commit 3652e2741f42 ("ARM: dts:
da850: Add clocks") are wrong but since the current timer code
hard-codes them, the bug was never spotted.

This patch must go into stable since, once we introduce a proper
clocksource driver, devices with buggy device tree will stop booting.

Fixes: 3652e2741f42 ("ARM: dts: da850: Add clocks")
Cc: stable@vger.kernel.org
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/boot/dts/da850.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
index 47aa53ba6b92..559659b399d0 100644
--- a/arch/arm/boot/dts/da850.dtsi
+++ b/arch/arm/boot/dts/da850.dtsi
@@ -476,7 +476,7 @@
 		clocksource: timer@20000 {
 			compatible = "ti,da830-timer";
 			reg = <0x20000 0x1000>;
-			interrupts = <12>, <13>;
+			interrupts = <21>, <22>;
 			interrupt-names = "tint12", "tint34";
 			clocks = <&pll0_auxclk>;
 		};
-- 
2.20.1

[PATCH v2 02/12] clocksource: davinci-timer: new driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Currently the clocksource and clockevent support for davinci platforms
lives in mach-davinci. It hard-codes many things, used global variables,
implements functionalities unused by any platform and has code fragments
scattered across many (often unrelated) files.

Implement a new, modern and simplified timer driver and put it into
drivers/clocksource. We still need to support legacy board files so
export a config structure and a function that allows machine code to
register the timer.

We don't bother freeing resources on errors in davinci_timer_register()
as the system won't boot without a timer anyway.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/clocksource/Kconfig         |   5 +
 drivers/clocksource/Makefile        |   1 +
 drivers/clocksource/timer-davinci.c | 431 ++++++++++++++++++++++++++++
 include/clocksource/timer-davinci.h |  44 +++
 4 files changed, 481 insertions(+)
 create mode 100644 drivers/clocksource/timer-davinci.c
 create mode 100644 include/clocksource/timer-davinci.h

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a9e26f6a81a1..36d222c3fa4a 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -42,6 +42,11 @@ config BCM_KONA_TIMER
 	help
 	  Enables the support for the BCM Kona mobile timer driver.
 
+config DAVINCI_TIMER
+	bool "Texas Instruments DaVinci timer driver"
+	help
+	  Enables the support for the TI DaVinci timer driver.
+
 config DIGICOLOR_TIMER
 	bool "Digicolor timer driver" if COMPILE_TEST
 	select CLKSRC_MMIO
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index cdd210ff89ea..1be97aa7a699 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_SH_TIMER_TMU)	+= sh_tmu.o
 obj-$(CONFIG_EM_TIMER_STI)	+= em_sti.o
 obj-$(CONFIG_CLKBLD_I8253)	+= i8253.o
 obj-$(CONFIG_CLKSRC_MMIO)	+= mmio.o
+obj-$(CONFIG_DAVINCI_TIMER)	+= timer-davinci.o
 obj-$(CONFIG_DIGICOLOR_TIMER)	+= timer-digicolor.o
 obj-$(CONFIG_OMAP_DM_TIMER)	+= timer-ti-dm.o
 obj-$(CONFIG_DW_APB_TIMER)	+= dw_apb_timer.o
diff --git a/drivers/clocksource/timer-davinci.c b/drivers/clocksource/timer-davinci.c
new file mode 100644
index 000000000000..a6d2d3f6526e
--- /dev/null
+++ b/drivers/clocksource/timer-davinci.c
@@ -0,0 +1,431 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// TI DaVinci clocksource driver
+//
+// Copyright (C) 2019 Texas Instruments
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+// (with some parts adopted from code by Kevin Hilman <khilman@baylibre.com>)
+
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
+
+#include <clocksource/timer-davinci.h>
+
+#define DAVINCI_TIMER_REG_TIM12			0x10
+#define DAVINCI_TIMER_REG_TIM34			0x14
+#define DAVINCI_TIMER_REG_PRD12			0x18
+#define DAVINCI_TIMER_REG_PRD34			0x1c
+#define DAVINCI_TIMER_REG_TCR			0x20
+#define DAVINCI_TIMER_REG_TGCR			0x24
+
+#define DAVINCI_TIMER_TIMMODE_MASK		GENMASK(3, 2)
+#define DAVINCI_TIMER_RESET_MASK		GENMASK(1, 0)
+#define DAVINCI_TIMER_TIMMODE_32BIT_UNCHAINED	BIT(2)
+#define DAVINCI_TIMER_UNRESET			GENMASK(1, 0)
+
+/* Shift depends on timer. */
+#define DAVINCI_TIMER_ENAMODE_MASK		GENMASK(1, 0)
+#define DAVINCI_TIMER_ENAMODE_DISABLED		0x00
+#define DAVINCI_TIMER_ENAMODE_ONESHOT		BIT(0)
+#define DAVINCI_TIMER_ENAMODE_PERIODIC		BIT(1)
+
+#define DAVINCI_TIMER_ENAMODE_SHIFT_TIM12	6
+#define DAVINCI_TIMER_ENAMODE_SHIFT_TIM34	22
+
+#define DAVINCI_TIMER_MIN_DELTA			0x01
+#define DAVINCI_TIMER_MAX_DELTA			0xfffffffe
+
+#define DAVINCI_TIMER_CLKSRC_BITS		32
+
+#define DAVINCI_TIMER_TGCR_DEFAULT \
+		(DAVINCI_TIMER_TIMMODE_32BIT_UNCHAINED | DAVINCI_TIMER_UNRESET)
+
+enum {
+	DAVINCI_TIMER_MODE_DISABLED = 0,
+	DAVINCI_TIMER_MODE_ONESHOT,
+	DAVINCI_TIMER_MODE_PERIODIC,
+};
+
+struct davinci_timer_data;
+
+typedef void (*davinci_timer_set_period_func)(struct davinci_timer_data *,
+					      unsigned int period);
+
+struct davinci_timer_regs {
+	unsigned int tim_off;
+	unsigned int prd_off;
+	unsigned int enamode_shift;
+};
+
+struct davinci_timer_data {
+	void __iomem *base;
+	const struct davinci_timer_regs *regs;
+	unsigned int mode;
+	davinci_timer_set_period_func set_period;
+	unsigned int cmp_off;
+};
+
+struct davinci_timer_clockevent {
+	struct clock_event_device dev;
+	unsigned int tick_rate;
+	struct davinci_timer_data timer;
+};
+
+struct davinci_timer_clocksource {
+	struct clocksource dev;
+	struct davinci_timer_data timer;
+};
+
+static const struct davinci_timer_regs davinci_timer_tim12_regs = {
+	.tim_off		= DAVINCI_TIMER_REG_TIM12,
+	.prd_off		= DAVINCI_TIMER_REG_PRD12,
+	.enamode_shift		= DAVINCI_TIMER_ENAMODE_SHIFT_TIM12,
+};
+
+static const struct davinci_timer_regs davinci_timer_tim34_regs = {
+	.tim_off		= DAVINCI_TIMER_REG_TIM34,
+	.prd_off		= DAVINCI_TIMER_REG_PRD34,
+	.enamode_shift		= DAVINCI_TIMER_ENAMODE_SHIFT_TIM34,
+};
+
+/* Must be global for davinci_timer_read_sched_clock(). */
+static struct davinci_timer_data *davinci_timer_clksrc_timer;
+
+static struct davinci_timer_clockevent *
+to_davinci_timer_clockevent(struct clock_event_device *clockevent)
+{
+	return container_of(clockevent, struct davinci_timer_clockevent, dev);
+}
+
+static struct davinci_timer_clocksource *
+to_davinci_timer_clocksource(struct clocksource *clocksource)
+{
+	return container_of(clocksource, struct davinci_timer_clocksource, dev);
+}
+
+static unsigned int davinci_timer_read(struct davinci_timer_data *timer,
+				       unsigned int reg)
+{
+	return __raw_readl(timer->base + reg);
+}
+
+static void davinci_timer_write(struct davinci_timer_data *timer,
+				unsigned int reg, unsigned int val)
+{
+	__raw_writel(val, timer->base + reg);
+}
+
+static void davinci_timer_update(struct davinci_timer_data *timer,
+				 unsigned int reg, unsigned int mask,
+				 unsigned int val)
+{
+	unsigned int new, orig = davinci_timer_read(timer, reg);
+
+	new = orig & ~mask;
+	new |= val & mask;
+
+	davinci_timer_write(timer, reg, new);
+}
+
+static void davinci_timer_set_period(struct davinci_timer_data *timer,
+				     unsigned int period)
+{
+	timer->set_period(timer, period);
+}
+
+static void davinci_timer_set_period_std(struct davinci_timer_data *timer,
+					 unsigned int period)
+{
+	const struct davinci_timer_regs *regs = timer->regs;
+	unsigned int enamode;
+
+	enamode = davinci_timer_read(timer, DAVINCI_TIMER_REG_TCR);
+
+	davinci_timer_update(timer, DAVINCI_TIMER_REG_TCR,
+			DAVINCI_TIMER_ENAMODE_MASK << regs->enamode_shift,
+			DAVINCI_TIMER_ENAMODE_DISABLED << regs->enamode_shift);
+
+	davinci_timer_write(timer, regs->tim_off, 0x0);
+	davinci_timer_write(timer, regs->prd_off, period);
+
+	if (timer->mode == DAVINCI_TIMER_MODE_ONESHOT)
+		enamode = DAVINCI_TIMER_ENAMODE_ONESHOT;
+	else if (timer->mode == DAVINCI_TIMER_MODE_PERIODIC)
+		enamode = DAVINCI_TIMER_ENAMODE_PERIODIC;
+
+	davinci_timer_update(timer, DAVINCI_TIMER_REG_TCR,
+			     DAVINCI_TIMER_ENAMODE_MASK << regs->enamode_shift,
+			     enamode << regs->enamode_shift);
+}
+
+static void davinci_timer_set_period_cmp(struct davinci_timer_data *timer,
+					 unsigned int period)
+{
+	const struct davinci_timer_regs *regs = timer->regs;
+	unsigned int curr_time;
+
+	curr_time = davinci_timer_read(timer, regs->tim_off);
+	davinci_timer_write(timer, timer->cmp_off, curr_time + period);
+}
+
+static irqreturn_t davinci_timer_irq_timer(int irq, void *data)
+{
+	struct davinci_timer_clockevent *clockevent = data;
+
+	clockevent->dev.event_handler(&clockevent->dev);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t davinci_timer_irq_freerun(int irq, void *data)
+{
+	return IRQ_HANDLED;
+}
+
+static u64 notrace davinci_timer_read_sched_clock(void)
+{
+	struct davinci_timer_data *timer;
+	unsigned int val;
+
+	timer = davinci_timer_clksrc_timer;
+	val = davinci_timer_read(timer, timer->regs->tim_off);
+
+	return val;
+}
+
+static u64 davinci_timer_clksrc_read(struct clocksource *dev)
+{
+	struct davinci_timer_clocksource *clocksource;
+	const struct davinci_timer_regs *regs;
+	unsigned int val;
+
+	clocksource = to_davinci_timer_clocksource(dev);
+	regs = clocksource->timer.regs;
+
+	val = davinci_timer_read(&clocksource->timer, regs->tim_off);
+
+	return val;
+}
+
+static int davinci_timer_set_next_event(unsigned long cycles,
+					struct clock_event_device *dev)
+{
+	struct davinci_timer_clockevent *clockevent;
+
+	clockevent = to_davinci_timer_clockevent(dev);
+	davinci_timer_set_period(&clockevent->timer, cycles);
+
+	return 0;
+}
+
+static int davinci_timer_set_state_shutdown(struct clock_event_device *dev)
+{
+	struct davinci_timer_clockevent *clockevent;
+
+	clockevent = to_davinci_timer_clockevent(dev);
+	clockevent->timer.mode = DAVINCI_TIMER_MODE_DISABLED;
+
+	return 0;
+}
+
+static int davinci_timer_set_state_periodic(struct clock_event_device *dev)
+{
+	struct davinci_timer_clockevent *clockevent;
+	unsigned int period;
+
+	clockevent = to_davinci_timer_clockevent(dev);
+	period = clockevent->tick_rate / HZ;
+
+	clockevent->timer.mode = DAVINCI_TIMER_MODE_PERIODIC;
+	davinci_timer_set_period(&clockevent->timer, period);
+
+	return 0;
+}
+
+static int davinci_timer_set_state_oneshot(struct clock_event_device *dev)
+{
+	struct davinci_timer_clockevent *clockevent;
+
+	clockevent = to_davinci_timer_clockevent(dev);
+	clockevent->timer.mode = DAVINCI_TIMER_MODE_ONESHOT;
+
+	return 0;
+}
+
+static void davinci_timer_init(void __iomem *base)
+{
+	/* Set clock to internal mode and disable it. */
+	__raw_writel(0x0, base + DAVINCI_TIMER_REG_TCR);
+	/*
+	 * Reset both 32-bit timers, set no prescaler for timer 34, set the
+	 * timer to dual 32-bit unchained mode, unreset both 32-bit timers.
+	 */
+	__raw_writel(DAVINCI_TIMER_TGCR_DEFAULT, base + DAVINCI_TIMER_REG_TGCR);
+	/* Init both counters to zero. */
+	__raw_writel(0x0, base + DAVINCI_TIMER_REG_TIM12);
+	__raw_writel(0x0, base + DAVINCI_TIMER_REG_TIM34);
+}
+
+int __init davinci_timer_register(struct clk *clk,
+				  const struct davinci_timer_cfg *timer_cfg)
+{
+	struct davinci_timer_clocksource *clocksource;
+	struct davinci_timer_clockevent *clockevent;
+	void __iomem *base;
+	int rv;
+
+	rv = clk_prepare_enable(clk);
+	if (rv) {
+		pr_err("%s: Unable to prepare and enable the timer clock\n",
+		       __func__);
+		return rv;
+	}
+
+	base = request_mem_region(timer_cfg->reg.start,
+				  resource_size(&timer_cfg->reg),
+				  "davinci-timer");
+	if (!base) {
+		pr_err("%s: Unable to request memory region\n", __func__);
+		return -EBUSY;
+	}
+
+	base = ioremap(timer_cfg->reg.start, resource_size(&timer_cfg->reg));
+	if (!base) {
+		pr_err("%s: Unable to map the register range\n", __func__);
+		return -ENOMEM;
+	}
+
+	davinci_timer_init(base);
+
+	clockevent = kzalloc(sizeof(*clockevent), GFP_KERNEL);
+	if (!clockevent) {
+		pr_err("%s: Error allocating memory for clockevent data\n",
+		       __func__);
+		return -ENOMEM;
+	}
+
+	clockevent->dev.name = "tim12";
+	clockevent->dev.features = CLOCK_EVT_FEAT_ONESHOT;
+	clockevent->dev.set_next_event = davinci_timer_set_next_event;
+	clockevent->dev.set_state_shutdown = davinci_timer_set_state_shutdown;
+	clockevent->dev.set_state_periodic = davinci_timer_set_state_periodic;
+	clockevent->dev.set_state_oneshot = davinci_timer_set_state_oneshot;
+	clockevent->dev.cpumask = cpumask_of(0);
+	clockevent->tick_rate = clk_get_rate(clk);
+	clockevent->timer.mode = DAVINCI_TIMER_MODE_DISABLED;
+	clockevent->timer.base = base;
+	clockevent->timer.regs = &davinci_timer_tim12_regs;
+
+	if (timer_cfg->cmp_off) {
+		clockevent->timer.cmp_off = timer_cfg->cmp_off;
+		clockevent->timer.set_period = davinci_timer_set_period_cmp;
+	} else {
+		clockevent->dev.features |= CLOCK_EVT_FEAT_PERIODIC;
+		clockevent->timer.set_period = davinci_timer_set_period_std;
+	}
+
+	rv = request_irq(timer_cfg->irq[DAVINCI_TIMER_CLOCKEVENT_IRQ].start,
+			 davinci_timer_irq_timer, IRQF_TIMER,
+			 "clockevent", clockevent);
+	if (rv) {
+		pr_err("%s: Unable to request the clockevent interrupt\n",
+		       __func__);
+		return rv;
+	}
+
+	clockevents_config_and_register(&clockevent->dev,
+					clockevent->tick_rate,
+					DAVINCI_TIMER_MIN_DELTA,
+					DAVINCI_TIMER_MAX_DELTA);
+
+	clocksource = kzalloc(sizeof(*clocksource), GFP_KERNEL);
+	if (!clocksource) {
+		pr_err("%s: Error allocating memory for clocksource data\n",
+		       __func__);
+		return -ENOMEM;
+	}
+
+	clocksource->dev.name = "tim34";
+	clocksource->dev.rating = 300;
+	clocksource->dev.read = davinci_timer_clksrc_read;
+	clocksource->dev.mask = CLOCKSOURCE_MASK(DAVINCI_TIMER_CLKSRC_BITS);
+	clocksource->dev.flags = CLOCK_SOURCE_IS_CONTINUOUS;
+	clocksource->timer.set_period = davinci_timer_set_period_std;
+	clocksource->timer.mode = DAVINCI_TIMER_MODE_PERIODIC;
+	clocksource->timer.base = base;
+
+	if (timer_cfg->cmp_off)
+		clocksource->timer.regs = &davinci_timer_tim12_regs;
+	else
+		clocksource->timer.regs = &davinci_timer_tim34_regs;
+
+	rv = request_irq(timer_cfg->irq[DAVINCI_TIMER_CLOCKSOURCE_IRQ].start,
+			 davinci_timer_irq_freerun, IRQF_TIMER,
+			 "free-run counter", clocksource);
+	if (rv) {
+		pr_err("%s: Unable to request the clocksource interrupt\n",
+		       __func__);
+		return rv;
+	}
+
+	rv = clocksource_register_hz(&clocksource->dev, clockevent->tick_rate);
+	if (rv) {
+		pr_err("%s: Unable to register clocksource\n",
+		       __func__);
+		return rv;
+	}
+
+	davinci_timer_clksrc_timer = &clocksource->timer;
+
+	sched_clock_register(davinci_timer_read_sched_clock,
+			     DAVINCI_TIMER_CLKSRC_BITS,
+			     clockevent->tick_rate);
+
+	davinci_timer_set_period(&clockevent->timer,
+				 clockevent->tick_rate / HZ);
+	davinci_timer_set_period(&clocksource->timer, UINT_MAX);
+
+	return 0;
+}
+
+static int __init of_davinci_timer_register(struct device_node *np)
+{
+	struct davinci_timer_cfg timer_cfg = { };
+	struct clk *clk;
+	int rv;
+
+	rv = of_address_to_resource(np, 0, &timer_cfg.reg);
+	if (rv) {
+		pr_err("%s: Unable to get the register range for timer\n",
+		       __func__);
+		return rv;
+	}
+
+	rv = of_irq_to_resource_table(np, timer_cfg.irq,
+				      DAVINCI_TIMER_NUM_IRQS);
+	if (rv != DAVINCI_TIMER_NUM_IRQS) {
+		pr_err("%s: Unable to get the interrupts for timer\n",
+		       __func__);
+		return rv;
+	}
+
+	clk = of_clk_get(np, 0);
+	if (IS_ERR(clk)) {
+		pr_err("%s: Unable to get the timer clock\n", __func__);
+		return PTR_ERR(clk);
+	}
+
+	rv = davinci_timer_register(clk, &timer_cfg);
+	if (rv)
+		clk_put(clk);
+
+	return rv;
+}
+TIMER_OF_DECLARE(davinci_timer, "ti,da830-timer", of_davinci_timer_register);
diff --git a/include/clocksource/timer-davinci.h b/include/clocksource/timer-davinci.h
new file mode 100644
index 000000000000..ef1de78a1820
--- /dev/null
+++ b/include/clocksource/timer-davinci.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * TI DaVinci clocksource driver
+ *
+ * Copyright (C) 2019 Texas Instruments
+ * Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+ */
+
+#ifndef __TIMER_DAVINCI_H__
+#define __TIMER_DAVINCI_H__
+
+#include <linux/clk.h>
+#include <linux/ioport.h>
+
+enum {
+	DAVINCI_TIMER_CLOCKEVENT_IRQ = 0,
+	DAVINCI_TIMER_CLOCKSOURCE_IRQ,
+	DAVINCI_TIMER_NUM_IRQS,
+};
+
+/**
+ * struct davinci_timer_cfg - davinci clocksource driver configuration struct
+ * @reg:        register range resource
+ * @irq:        clockevent and clocksource interrupt resources
+ * @cmp_off:    if set - it specifies the compare register used for clockevent
+ *
+ * Note: if the compare register is specified, the driver will use the bottom
+ * clock half for both clocksource and clockevent and the compare register
+ * to generate event irqs. The user must supply the correct compare register
+ * interrupt number.
+ *
+ * This is only used by da830 the DSP of which uses the top half. The timer
+ * driver still configures the top half to run in free-run mode.
+ */
+struct davinci_timer_cfg {
+	struct resource reg;
+	struct resource irq[DAVINCI_TIMER_NUM_IRQS];
+	unsigned int cmp_off;
+};
+
+int __init davinci_timer_register(struct clk *clk,
+				  const struct davinci_timer_cfg *data);
+
+#endif /* __TIMER_DAVINCI_H__ */
-- 
2.20.1

[PATCH v2 03/12] ARM: davinci: enable the clocksource driver for DT mode

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Switch all davinci boards using device tree to using the new
clocksource driver: remove the previous OF_TIMER_DECLARE() from
mach-davinci and select davinci-timer to be built for
davinci_all_defconfig.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/Kconfig             |  1 +
 arch/arm/mach-davinci/time.c | 14 --------------
 2 files changed, 1 insertion(+), 14 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 664e918e2624..8a09a0ab0ce2 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -586,6 +586,7 @@ config ARCH_DAVINCI
 	select ARCH_HAS_HOLES_MEMORYMODEL
 	select COMMON_CLK
 	select CPU_ARM926T
+	select DAVINCI_TIMER
 	select GENERIC_ALLOCATOR
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_IRQ_CHIP
diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
index 5a6de5368ab0..740410a3bb6a 100644
--- a/arch/arm/mach-davinci/time.c
+++ b/arch/arm/mach-davinci/time.c
@@ -398,17 +398,3 @@ void __init davinci_timer_init(struct clk *timer_clk)
 	for (i=0; i< ARRAY_SIZE(timers); i++)
 		timer32_config(&timers[i]);
 }
-
-static int __init of_davinci_timer_init(struct device_node *np)
-{
-	struct clk *clk;
-
-	clk = of_clk_get(np, 0);
-	if (IS_ERR(clk))
-		return PTR_ERR(clk);
-
-	davinci_timer_init(clk);
-
-	return 0;
-}
-TIMER_OF_DECLARE(davinci_timer, "ti,da830-timer", of_davinci_timer_init);
-- 
2.20.1

[PATCH v2 04/12] ARM: davinci: WARN_ON() if clk_get() fails

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Currently the timer code checks if the clock pointer passed to it is
good (!IS_ERR(clk)). The new clocksource driver expects the clock to
be functional and doesn't perform any checks so emit a warning if
clk_get() fails. Apply this to all davinci platforms.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/da830.c  | 4 ++++
 arch/arm/mach-davinci/da850.c  | 4 ++++
 arch/arm/mach-davinci/dm355.c  | 4 ++++
 arch/arm/mach-davinci/dm365.c  | 4 ++++
 arch/arm/mach-davinci/dm644x.c | 4 ++++
 arch/arm/mach-davinci/dm646x.c | 4 ++++
 6 files changed, 24 insertions(+)

diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
index 2cc9fe4c3a91..9a4b749cbb6b 100644
--- a/arch/arm/mach-davinci/da830.c
+++ b/arch/arm/mach-davinci/da830.c
@@ -834,6 +834,10 @@ void __init da830_init_time(void)
 	da830_pll_init(NULL, pll, NULL);
 
 	clk = clk_get(NULL, "timer0");
+	if (WARN_ON(IS_ERR(clk))) {
+		pr_err("Unable to get the timer clock\n");
+		return;
+	}
 
 	davinci_timer_init(clk);
 }
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index e7b78df2bfef..beb34ee42e3a 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -774,6 +774,10 @@ void __init da850_init_time(void)
 	da850_pll0_init(NULL, pll0, cfgchip);
 
 	clk = clk_get(NULL, "timer0");
+	if (WARN_ON(IS_ERR(clk))) {
+		pr_err("Unable to get the timer clock\n");
+		return;
+	}
 
 	davinci_timer_init(clk);
 }
diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c
index 4c6e0bef4509..2a523fa7c716 100644
--- a/arch/arm/mach-davinci/dm355.c
+++ b/arch/arm/mach-davinci/dm355.c
@@ -745,6 +745,10 @@ void __init dm355_init_time(void)
 	dm355_psc_init(NULL, psc);
 
 	clk = clk_get(NULL, "timer0");
+	if (WARN_ON(IS_ERR(clk))) {
+		pr_err("Unable to get the timer clock\n");
+		return;
+	}
 
 	davinci_timer_init(clk);
 }
diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c
index 01fb2b0c82de..68bd78dac293 100644
--- a/arch/arm/mach-davinci/dm365.c
+++ b/arch/arm/mach-davinci/dm365.c
@@ -786,6 +786,10 @@ void __init dm365_init_time(void)
 	dm365_psc_init(NULL, psc);
 
 	clk = clk_get(NULL, "timer0");
+	if (WARN_ON(IS_ERR(clk))) {
+		pr_err("Unable to get the timer clock\n");
+		return;
+	}
 
 	davinci_timer_init(clk);
 }
diff --git a/arch/arm/mach-davinci/dm644x.c b/arch/arm/mach-davinci/dm644x.c
index 38f92b7d413e..070660cfd93a 100644
--- a/arch/arm/mach-davinci/dm644x.c
+++ b/arch/arm/mach-davinci/dm644x.c
@@ -681,6 +681,10 @@ void __init dm644x_init_time(void)
 	dm644x_psc_init(NULL, psc);
 
 	clk = clk_get(NULL, "timer0");
+	if (WARN_ON(IS_ERR(clk))) {
+		pr_err("Unable to get the timer clock\n");
+		return;
+	}
 
 	davinci_timer_init(clk);
 }
diff --git a/arch/arm/mach-davinci/dm646x.c b/arch/arm/mach-davinci/dm646x.c
index 7dc54b2a610f..73a0f0226017 100644
--- a/arch/arm/mach-davinci/dm646x.c
+++ b/arch/arm/mach-davinci/dm646x.c
@@ -665,6 +665,10 @@ void __init dm646x_init_time(unsigned long ref_clk_rate,
 	dm646x_psc_init(NULL, psc);
 
 	clk = clk_get(NULL, "timer0");
+	if (WARN_ON(IS_ERR(clk))) {
+		pr_err("Unable to get the timer clock\n");
+		return;
+	}
 
 	davinci_timer_init(clk);
 }
-- 
2.20.1

[PATCH v2 05/12] ARM: davinci: da850: switch to using the clocksource driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We now have a proper clocksource driver for davinci. Switch the platform
to using it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/da850.c | 56 ++++++++++++++---------------------
 1 file changed, 22 insertions(+), 34 deletions(-)

diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index beb34ee42e3a..66c2ffd4885b 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -34,7 +34,8 @@
 #include <mach/da8xx.h>
 #include <mach/irqs.h>
 #include <mach/pm.h>
-#include <mach/time.h>
+
+#include <clocksource/timer-davinci.h>
 
 #include "mux.h"
 
@@ -436,38 +437,24 @@ static struct davinci_id da850_ids[] = {
 	},
 };
 
-static struct davinci_timer_instance da850_timer_instance[4] = {
-	{
-		.base		= DA8XX_TIMER64P0_BASE,
-		.bottom_irq	= IRQ_DA8XX_TINT12_0,
-		.top_irq	= IRQ_DA8XX_TINT34_0,
-	},
-	{
-		.base		= DA8XX_TIMER64P1_BASE,
-		.bottom_irq	= IRQ_DA8XX_TINT12_1,
-		.top_irq	= IRQ_DA8XX_TINT34_1,
-	},
-	{
-		.base		= DA850_TIMER64P2_BASE,
-		.bottom_irq	= IRQ_DA850_TINT12_2,
-		.top_irq	= IRQ_DA850_TINT34_2,
-	},
-	{
-		.base		= DA850_TIMER64P3_BASE,
-		.bottom_irq	= IRQ_DA850_TINT12_3,
-		.top_irq	= IRQ_DA850_TINT34_3,
+static const struct davinci_timer_cfg da850_timer_cfg = {
+	.reg = {
+		.start		= DA8XX_TIMER64P0_BASE,
+		.end		= DA8XX_TIMER64P0_BASE + SZ_4K,
+		.flags		= IORESOURCE_MEM,
 	},
-};
-
-/*
- * T0_BOT: Timer 0, bottom		: Used for clock_event
- * T0_TOP: Timer 0, top			: Used for clocksource
- * T1_BOT, T1_TOP: Timer 1, bottom & top: Used for watchdog timer
- */
-static struct davinci_timer_info da850_timer_info = {
-	.timers		= da850_timer_instance,
-	.clockevent_id	= T0_BOT,
-	.clocksource_id	= T0_TOP,
+	.irq = {
+		{
+			.start	= IRQ_DA8XX_TINT12_0,
+			.end	= IRQ_DA8XX_TINT12_0,
+			.flags	= IORESOURCE_IRQ,
+		},
+		{
+			.start	= IRQ_DA8XX_TINT34_0,
+			.end	= IRQ_DA8XX_TINT34_0,
+			.flags	= IORESOURCE_IRQ,
+		}
+	}
 };
 
 #ifdef CONFIG_CPU_FREQ
@@ -742,7 +729,6 @@ static const struct davinci_soc_info davinci_soc_info_da850 = {
 	.intc_type		= DAVINCI_INTC_TYPE_CP_INTC,
 	.intc_irq_prios		= da850_default_priorities,
 	.intc_irq_num		= DA850_N_CP_INTC_IRQ,
-	.timer_info		= &da850_timer_info,
 	.emac_pdata		= &da8xx_emac_pdata,
 	.sram_dma		= DA8XX_SHARED_RAM_BASE,
 	.sram_len		= SZ_128K,
@@ -765,6 +751,7 @@ void __init da850_init_time(void)
 	void __iomem *pll0;
 	struct regmap *cfgchip;
 	struct clk *clk;
+	int rv;
 
 	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, DA850_REF_FREQ);
 
@@ -779,7 +766,8 @@ void __init da850_init_time(void)
 		return;
 	}
 
-	davinci_timer_init(clk);
+	rv = davinci_timer_register(clk, &da850_timer_cfg);
+	WARN(rv, "Unable to register the timer: %d\n", rv);
 }
 
 static struct resource da850_pll1_resources[] = {
-- 
2.20.1

[PATCH v2 06/12] ARM: davinci: da830: switch to using the clocksource driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We now have a proper clocksource driver for davinci. Switch the platform
to using it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/da830.c | 49 ++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 27 deletions(-)

diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
index 9a4b749cbb6b..eb2d92a6ee18 100644
--- a/arch/arm/mach-davinci/da830.c
+++ b/arch/arm/mach-davinci/da830.c
@@ -20,7 +20,8 @@
 #include <mach/cputype.h>
 #include <mach/da8xx.h>
 #include <mach/irqs.h>
-#include <mach/time.h>
+
+#include <clocksource/timer-davinci.h>
 
 #include "mux.h"
 
@@ -769,32 +770,25 @@ int __init da830_register_gpio(void)
 	return da8xx_register_gpio(&da830_gpio_platform_data);
 }
 
-static struct davinci_timer_instance da830_timer_instance[2] = {
-	{
-		.base		= DA8XX_TIMER64P0_BASE,
-		.bottom_irq	= IRQ_DA8XX_TINT12_0,
-		.top_irq	= IRQ_DA8XX_TINT34_0,
-		.cmp_off	= DA830_CMP12_0,
-		.cmp_irq	= IRQ_DA830_T12CMPINT0_0,
+static const struct davinci_timer_cfg da830_timer_cfg = {
+	.reg = {
+		.start		= DA8XX_TIMER64P0_BASE,
+		.end		= DA8XX_TIMER64P0_BASE + SZ_4K,
+		.flags		= IORESOURCE_MEM,
 	},
-	{
-		.base		= DA8XX_TIMER64P1_BASE,
-		.bottom_irq	= IRQ_DA8XX_TINT12_1,
-		.top_irq	= IRQ_DA8XX_TINT34_1,
-		.cmp_off	= DA830_CMP12_0,
-		.cmp_irq	= IRQ_DA830_T12CMPINT0_1,
+	.irq = {
+		{
+			.start	= IRQ_DA830_T12CMPINT0_0,
+			.end	= IRQ_DA830_T12CMPINT0_0,
+			.flags	= IORESOURCE_IRQ,
+		},
+		{
+			.start	= IRQ_DA8XX_TINT12_0,
+			.end	= IRQ_DA8XX_TINT12_0,
+			.flags	= IORESOURCE_IRQ,
+		},
 	},
-};
-
-/*
- * T0_BOT: Timer 0, bottom		: Used for clock_event & clocksource
- * T0_TOP: Timer 0, top			: Used by DSP
- * T1_BOT, T1_TOP: Timer 1, bottom & top: Used for watchdog timer
- */
-static struct davinci_timer_info da830_timer_info = {
-	.timers		= da830_timer_instance,
-	.clockevent_id	= T0_BOT,
-	.clocksource_id	= T0_BOT,
+	.cmp_off		= DA830_CMP12_0,
 };
 
 static const struct davinci_soc_info davinci_soc_info_da830 = {
@@ -810,7 +804,6 @@ static const struct davinci_soc_info davinci_soc_info_da830 = {
 	.intc_type		= DAVINCI_INTC_TYPE_CP_INTC,
 	.intc_irq_prios		= da830_default_priorities,
 	.intc_irq_num		= DA830_N_CP_INTC_IRQ,
-	.timer_info		= &da830_timer_info,
 	.emac_pdata		= &da8xx_emac_pdata,
 };
 
@@ -826,6 +819,7 @@ void __init da830_init_time(void)
 {
 	void __iomem *pll;
 	struct clk *clk;
+	int rv;
 
 	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, DA830_REF_FREQ);
 
@@ -839,7 +833,8 @@ void __init da830_init_time(void)
 		return;
 	}
 
-	davinci_timer_init(clk);
+	rv = davinci_timer_register(clk, &da830_timer_cfg);
+	WARN(rv, "Unable to register the timer: %d\n", rv);
 }
 
 static struct resource da830_psc0_resources[] = {
-- 
2.20.1

[PATCH v2 07/12] ARM: davinci: move timer definitions to davinci.h

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Boards from the dm* family rely on register offset definitions from
arch/arm/mach-davinci/include/mach/time.h. We'll be removing this file
soon, so move the required defines to davinci.h where the rest of such
constants live.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/davinci.h           | 3 +++
 arch/arm/mach-davinci/include/mach/time.h | 2 --
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-davinci/davinci.h b/arch/arm/mach-davinci/davinci.h
index db4c95ef4d5c..dfd1b1ab7b59 100644
--- a/arch/arm/mach-davinci/davinci.h
+++ b/arch/arm/mach-davinci/davinci.h
@@ -60,6 +60,9 @@ void davinci_map_sysmod(void);
 #define DAVINCI_GPIO_BASE 0x01C67000
 int davinci_gpio_register(struct resource *res, int size, void *pdata);
 
+#define DAVINCI_TIMER0_BASE		(IO_PHYS + 0x21400)
+#define DAVINCI_WDOG_BASE		(IO_PHYS + 0x21C00)
+
 /* DM355 base addresses */
 #define DM355_ASYNC_EMIF_CONTROL_BASE	0x01e10000
 #define DM355_ASYNC_EMIF_DATA_CE0_BASE	0x02000000
diff --git a/arch/arm/mach-davinci/include/mach/time.h b/arch/arm/mach-davinci/include/mach/time.h
index 1c971d8d8ba8..ba913736990f 100644
--- a/arch/arm/mach-davinci/include/mach/time.h
+++ b/arch/arm/mach-davinci/include/mach/time.h
@@ -11,9 +11,7 @@
 #ifndef __ARCH_ARM_MACH_DAVINCI_TIME_H
 #define __ARCH_ARM_MACH_DAVINCI_TIME_H
 
-#define DAVINCI_TIMER0_BASE		(IO_PHYS + 0x21400)
 #define DAVINCI_TIMER1_BASE		(IO_PHYS + 0x21800)
-#define DAVINCI_WDOG_BASE		(IO_PHYS + 0x21C00)
 
 enum {
 	T0_BOT,
-- 
2.20.1

[PATCH v2 08/12] ARM: davinci: dm355: switch to using the clocksource driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We now have a proper clocksource driver for davinci. Switch the platform
to using it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/dm355.c | 36 ++++++++++++++++++++++-------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mach-davinci/dm355.c b/arch/arm/mach-davinci/dm355.c
index 2a523fa7c716..287cddaec67c 100644
--- a/arch/arm/mach-davinci/dm355.c
+++ b/arch/arm/mach-davinci/dm355.c
@@ -29,7 +29,8 @@
 #include <mach/irqs.h>
 #include <mach/mux.h>
 #include <mach/serial.h>
-#include <mach/time.h>
+
+#include <clocksource/timer-davinci.h>
 
 #include "asp.h"
 #include "davinci.h"
@@ -617,16 +618,24 @@ static struct davinci_id dm355_ids[] = {
 	},
 };
 
-/*
- * T0_BOT: Timer 0, bottom:  clockevent source for hrtimers
- * T0_TOP: Timer 0, top   :  clocksource for generic timekeeping
- * T1_BOT: Timer 1, bottom:  (used by DSP in TI DSPLink code)
- * T1_TOP: Timer 1, top   :  <unused>
- */
-static struct davinci_timer_info dm355_timer_info = {
-	.timers		= davinci_timer_instance,
-	.clockevent_id	= T0_BOT,
-	.clocksource_id	= T0_TOP,
+static const struct davinci_timer_cfg dm355_timer_cfg = {
+	.reg = {
+		.start		= DAVINCI_TIMER0_BASE,
+		.end		= DAVINCI_TIMER0_BASE + SZ_4K,
+		.flags		= IORESOURCE_MEM,
+	},
+	.irq = {
+		{
+			.start	= IRQ_TINT0_TINT12,
+			.end	= IRQ_TINT0_TINT12,
+			.flags	= IORESOURCE_IRQ,
+		},
+		{
+			.start	= IRQ_TINT0_TINT34,
+			.end	= IRQ_TINT0_TINT34,
+			.flags	= IORESOURCE_IRQ,
+		}
+	}
 };
 
 static struct plat_serial8250_port dm355_serial0_platform_data[] = {
@@ -708,7 +717,6 @@ static const struct davinci_soc_info davinci_soc_info_dm355 = {
 	.intc_type		= DAVINCI_INTC_TYPE_AINTC,
 	.intc_irq_prios		= dm355_default_priorities,
 	.intc_irq_num		= DAVINCI_N_AINTC_IRQ,
-	.timer_info		= &dm355_timer_info,
 	.sram_dma		= 0x00010000,
 	.sram_len		= SZ_32K,
 };
@@ -735,6 +743,7 @@ void __init dm355_init_time(void)
 {
 	void __iomem *pll1, *psc;
 	struct clk *clk;
+	int rv;
 
 	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, DM355_REF_FREQ);
 
@@ -750,7 +759,8 @@ void __init dm355_init_time(void)
 		return;
 	}
 
-	davinci_timer_init(clk);
+	rv = davinci_timer_register(clk, &dm355_timer_cfg);
+	WARN(rv, "Unable to register the timer: %d\n", rv);
 }
 
 static struct resource dm355_pll2_resources[] = {
-- 
2.20.1

[PATCH v2 09/12] ARM: davinci: dm365: switch to using the clocksource driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We now have a proper clocksource driver for davinci. Switch the platform
to using it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/dm365.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-davinci/dm365.c b/arch/arm/mach-davinci/dm365.c
index 68bd78dac293..fa83dec162e6 100644
--- a/arch/arm/mach-davinci/dm365.c
+++ b/arch/arm/mach-davinci/dm365.c
@@ -34,7 +34,8 @@
 #include <mach/irqs.h>
 #include <mach/mux.h>
 #include <mach/serial.h>
-#include <mach/time.h>
+
+#include <clocksource/timer-davinci.h>
 
 #include "asp.h"
 #include "davinci.h"
@@ -658,10 +659,24 @@ static struct davinci_id dm365_ids[] = {
 	},
 };
 
-static struct davinci_timer_info dm365_timer_info = {
-	.timers		= davinci_timer_instance,
-	.clockevent_id	= T0_BOT,
-	.clocksource_id	= T0_TOP,
+static const struct davinci_timer_cfg dm365_timer_cfg = {
+	.reg = {
+		.start		= DAVINCI_TIMER0_BASE,
+		.end		= DAVINCI_TIMER0_BASE + SZ_4K,
+		.flags		= IORESOURCE_MEM,
+	},
+	.irq = {
+		{
+			.start	= IRQ_TINT0_TINT12,
+			.end	= IRQ_TINT0_TINT12,
+			.flags	= IORESOURCE_IRQ,
+		},
+		{
+			.start	= IRQ_TINT0_TINT34,
+			.end	= IRQ_TINT0_TINT34,
+			.flags	= IORESOURCE_IRQ,
+		}
+	}
 };
 
 #define DM365_UART1_BASE	(IO_PHYS + 0x106000)
@@ -725,7 +740,6 @@ static const struct davinci_soc_info davinci_soc_info_dm365 = {
 	.intc_type		= DAVINCI_INTC_TYPE_AINTC,
 	.intc_irq_prios		= dm365_default_priorities,
 	.intc_irq_num		= DAVINCI_N_AINTC_IRQ,
-	.timer_info		= &dm365_timer_info,
 	.emac_pdata		= &dm365_emac_pdata,
 	.sram_dma		= 0x00010000,
 	.sram_len		= SZ_32K,
@@ -773,6 +787,7 @@ void __init dm365_init_time(void)
 {
 	void __iomem *pll1, *pll2, *psc;
 	struct clk *clk;
+	int rv;
 
 	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, DM365_REF_FREQ);
 
@@ -791,7 +806,8 @@ void __init dm365_init_time(void)
 		return;
 	}
 
-	davinci_timer_init(clk);
+	rv = davinci_timer_register(clk, &dm365_timer_cfg);
+	WARN(rv, "Unable to register the timer: %d\n", rv);
 }
 
 void __init dm365_register_clocks(void)
-- 
2.20.1

[PATCH v2 10/12] ARM: davinci: dm644x: switch to using the clocksource driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We now have a proper clocksource driver for davinci. Switch the platform
to using it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/dm644x.c | 36 ++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mach-davinci/dm644x.c b/arch/arm/mach-davinci/dm644x.c
index 070660cfd93a..b80346954977 100644
--- a/arch/arm/mach-davinci/dm644x.c
+++ b/arch/arm/mach-davinci/dm644x.c
@@ -26,7 +26,8 @@
 #include <mach/irqs.h>
 #include <mach/mux.h>
 #include <mach/serial.h>
-#include <mach/time.h>
+
+#include <clocksource/timer-davinci.h>
 
 #include "asp.h"
 #include "davinci.h"
@@ -558,16 +559,24 @@ static struct davinci_id dm644x_ids[] = {
 	},
 };
 
-/*
- * T0_BOT: Timer 0, bottom:  clockevent source for hrtimers
- * T0_TOP: Timer 0, top   :  clocksource for generic timekeeping
- * T1_BOT: Timer 1, bottom:  (used by DSP in TI DSPLink code)
- * T1_TOP: Timer 1, top   :  <unused>
- */
-static struct davinci_timer_info dm644x_timer_info = {
-	.timers		= davinci_timer_instance,
-	.clockevent_id	= T0_BOT,
-	.clocksource_id	= T0_TOP,
+static const struct davinci_timer_cfg dm644x_timer_cfg = {
+	.reg = {
+		.start		= DAVINCI_TIMER0_BASE,
+		.end		= DAVINCI_TIMER0_BASE + SZ_4K,
+		.flags		= IORESOURCE_MEM,
+	},
+	.irq = {
+		{
+			.start	= IRQ_TINT0_TINT12,
+			.end	= IRQ_TINT0_TINT12,
+			.flags	= IORESOURCE_IRQ,
+		},
+		{
+			.start	= IRQ_TINT0_TINT34,
+			.end	= IRQ_TINT0_TINT34,
+			.flags	= IORESOURCE_IRQ,
+		}
+	}
 };
 
 static struct plat_serial8250_port dm644x_serial0_platform_data[] = {
@@ -649,7 +658,6 @@ static const struct davinci_soc_info davinci_soc_info_dm644x = {
 	.intc_type		= DAVINCI_INTC_TYPE_AINTC,
 	.intc_irq_prios 	= dm644x_default_priorities,
 	.intc_irq_num		= DAVINCI_N_AINTC_IRQ,
-	.timer_info		= &dm644x_timer_info,
 	.emac_pdata		= &dm644x_emac_pdata,
 	.sram_dma		= 0x00008000,
 	.sram_len		= SZ_16K,
@@ -671,6 +679,7 @@ void __init dm644x_init_time(void)
 {
 	void __iomem *pll1, *psc;
 	struct clk *clk;
+	int rv;
 
 	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, DM644X_REF_FREQ);
 
@@ -686,7 +695,8 @@ void __init dm644x_init_time(void)
 		return;
 	}
 
-	davinci_timer_init(clk);
+	rv = davinci_timer_register(clk, &dm644x_timer_cfg);
+	WARN(rv, "Unable to register the timer: %d\n", rv);
 }
 
 static struct resource dm644x_pll2_resources[] = {
-- 
2.20.1

[PATCH v2 11/12] ARM: davinci: dm646x: switch to using the clocksource driver

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We now have a proper clocksource driver for davinci. Switch the platform
to using it.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/dm646x.c | 36 ++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/arch/arm/mach-davinci/dm646x.c b/arch/arm/mach-davinci/dm646x.c
index 73a0f0226017..5058be123dbe 100644
--- a/arch/arm/mach-davinci/dm646x.c
+++ b/arch/arm/mach-davinci/dm646x.c
@@ -27,7 +27,8 @@
 #include <mach/irqs.h>
 #include <mach/mux.h>
 #include <mach/serial.h>
-#include <mach/time.h>
+
+#include <clocksource/timer-davinci.h>
 
 #include "asp.h"
 #include "davinci.h"
@@ -498,16 +499,24 @@ static struct davinci_id dm646x_ids[] = {
 	},
 };
 
-/*
- * T0_BOT: Timer 0, bottom:  clockevent source for hrtimers
- * T0_TOP: Timer 0, top   :  clocksource for generic timekeeping
- * T1_BOT: Timer 1, bottom:  (used by DSP in TI DSPLink code)
- * T1_TOP: Timer 1, top   :  <unused>
- */
-static struct davinci_timer_info dm646x_timer_info = {
-	.timers		= davinci_timer_instance,
-	.clockevent_id	= T0_BOT,
-	.clocksource_id	= T0_TOP,
+static const struct davinci_timer_cfg dm646x_timer_cfg = {
+	.reg = {
+		.start		= DAVINCI_TIMER0_BASE,
+		.end		= DAVINCI_TIMER0_BASE + SZ_4K,
+		.flags		= IORESOURCE_MEM,
+	},
+	.irq = {
+		{
+			.start	= IRQ_TINT0_TINT12,
+			.end	= IRQ_TINT0_TINT12,
+			.flags	= IORESOURCE_IRQ,
+		},
+		{
+			.start	= IRQ_TINT0_TINT34,
+			.end	= IRQ_TINT0_TINT34,
+			.flags	= IORESOURCE_IRQ,
+		}
+	}
 };
 
 static struct plat_serial8250_port dm646x_serial0_platform_data[] = {
@@ -589,7 +598,6 @@ static const struct davinci_soc_info davinci_soc_info_dm646x = {
 	.intc_type		= DAVINCI_INTC_TYPE_AINTC,
 	.intc_irq_prios		= dm646x_default_priorities,
 	.intc_irq_num		= DAVINCI_N_AINTC_IRQ,
-	.timer_info		= &dm646x_timer_info,
 	.emac_pdata		= &dm646x_emac_pdata,
 	.sram_dma		= 0x10010000,
 	.sram_len		= SZ_32K,
@@ -654,6 +662,7 @@ void __init dm646x_init_time(unsigned long ref_clk_rate,
 {
 	void __iomem *pll1, *psc;
 	struct clk *clk;
+	int rv;
 
 	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, ref_clk_rate);
 	clk_register_fixed_rate(NULL, "aux_clkin", NULL, 0, aux_clkin_rate);
@@ -670,7 +679,8 @@ void __init dm646x_init_time(unsigned long ref_clk_rate,
 		return;
 	}
 
-	davinci_timer_init(clk);
+	rv = davinci_timer_register(clk, &dm646x_timer_cfg);
+	WARN(rv, "Unable to register the timer: %d\n", rv);
 }
 
 static struct resource dm646x_pll2_resources[] = {
-- 
2.20.1

[PATCH v2 12/12] ARM: davinci: remove legacy timer support

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

All platforms have now been switched to the new clocksource driver.
Remove the old code and various no longer needed bits and pieces.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 arch/arm/mach-davinci/Makefile              |   3 +-
 arch/arm/mach-davinci/devices-da8xx.c       |   1 -
 arch/arm/mach-davinci/devices.c             |  19 -
 arch/arm/mach-davinci/include/mach/common.h |  17 -
 arch/arm/mach-davinci/include/mach/time.h   |  33 --
 arch/arm/mach-davinci/time.c                | 400 --------------------
 6 files changed, 1 insertion(+), 472 deletions(-)
 delete mode 100644 arch/arm/mach-davinci/include/mach/time.h
 delete mode 100644 arch/arm/mach-davinci/time.c

diff --git a/arch/arm/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile
index 93d271b4d84b..fa8e66a223b6 100644
--- a/arch/arm/mach-davinci/Makefile
+++ b/arch/arm/mach-davinci/Makefile
@@ -5,8 +5,7 @@
 #
 
 # Common objects
-obj-y 					:= time.o serial.o usb.o \
-					   common.o sram.o
+obj-y 					:= serial.o usb.o common.o sram.o
 
 obj-$(CONFIG_DAVINCI_MUX)		+= mux.o
 
diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
index cf78da5ab054..0e6047f0189a 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -24,7 +24,6 @@
 #include <mach/common.h>
 #include <mach/cputype.h>
 #include <mach/da8xx.h>
-#include <mach/time.h>
 
 #include "asp.h"
 #include "cpuidle.h"
diff --git a/arch/arm/mach-davinci/devices.c b/arch/arm/mach-davinci/devices.c
index e8dbbb7479ab..584b4fa14a82 100644
--- a/arch/arm/mach-davinci/devices.c
+++ b/arch/arm/mach-davinci/devices.c
@@ -21,7 +21,6 @@
 #include <mach/cputype.h>
 #include <mach/mux.h>
 #include <linux/platform_data/mmc-davinci.h>
-#include <mach/time.h>
 #include <linux/platform_data/edma.h>
 
 
@@ -305,21 +304,3 @@ int davinci_gpio_register(struct resource *res, int size, void *pdata)
 	davinci_gpio_device.dev.platform_data = pdata;
 	return platform_device_register(&davinci_gpio_device);
 }
-
-/*-------------------------------------------------------------------------*/
-
-/*-------------------------------------------------------------------------*/
-
-struct davinci_timer_instance davinci_timer_instance[2] = {
-	{
-		.base		= DAVINCI_TIMER0_BASE,
-		.bottom_irq	= IRQ_TINT0_TINT12,
-		.top_irq	= IRQ_TINT0_TINT34,
-	},
-	{
-		.base		= DAVINCI_TIMER1_BASE,
-		.bottom_irq	= IRQ_TINT1_TINT12,
-		.top_irq	= IRQ_TINT1_TINT34,
-	},
-};
-
diff --git a/arch/arm/mach-davinci/include/mach/common.h b/arch/arm/mach-davinci/include/mach/common.h
index b577e13a9c23..ec721c1842ae 100644
--- a/arch/arm/mach-davinci/include/mach/common.h
+++ b/arch/arm/mach-davinci/include/mach/common.h
@@ -17,26 +17,10 @@
 #include <linux/types.h>
 #include <linux/reboot.h>
 
-void davinci_timer_init(struct clk *clk);
-
 extern void davinci_irq_init(void);
 extern void __iomem *davinci_intc_base;
 extern int davinci_intc_type;
 
-struct davinci_timer_instance {
-	u32		base;
-	u32		bottom_irq;
-	u32		top_irq;
-	unsigned long	cmp_off;
-	unsigned int	cmp_irq;
-};
-
-struct davinci_timer_info {
-	struct davinci_timer_instance	*timers;
-	unsigned int			clockevent_id;
-	unsigned int			clocksource_id;
-};
-
 struct davinci_gpio_controller;
 
 /*
@@ -62,7 +46,6 @@ struct davinci_soc_info {
 	u8				*intc_irq_prios;
 	unsigned long			intc_irq_num;
 	u32				*intc_host_map;
-	struct davinci_timer_info	*timer_info;
 	int				gpio_type;
 	u32				gpio_base;
 	unsigned			gpio_num;
diff --git a/arch/arm/mach-davinci/include/mach/time.h b/arch/arm/mach-davinci/include/mach/time.h
deleted file mode 100644
index ba913736990f..000000000000
--- a/arch/arm/mach-davinci/include/mach/time.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Local header file for DaVinci time code.
- *
- * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
- *
- * 2007 (c) MontaVista Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
- */
-#ifndef __ARCH_ARM_MACH_DAVINCI_TIME_H
-#define __ARCH_ARM_MACH_DAVINCI_TIME_H
-
-#define DAVINCI_TIMER1_BASE		(IO_PHYS + 0x21800)
-
-enum {
-	T0_BOT,
-	T0_TOP,
-	T1_BOT,
-	T1_TOP,
-	NUM_TIMERS
-};
-
-#define IS_TIMER1(id)		(id & 0x2)
-#define IS_TIMER0(id)		(!IS_TIMER1(id))
-#define IS_TIMER_TOP(id)	((id & 0x1))
-#define IS_TIMER_BOT(id)	(!IS_TIMER_TOP(id))
-
-#define ID_TO_TIMER(id)		(IS_TIMER1(id) != 0)
-
-extern struct davinci_timer_instance davinci_timer_instance[];
-
-#endif /* __ARCH_ARM_MACH_DAVINCI_TIME_H */
diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
deleted file mode 100644
index 740410a3bb6a..000000000000
--- a/arch/arm/mach-davinci/time.c
+++ /dev/null
@@ -1,400 +0,0 @@
-/*
- * DaVinci timer subsystem
- *
- * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
- *
- * 2007 (c) MontaVista Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
- */
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/interrupt.h>
-#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-#include <linux/sched_clock.h>
-
-#include <asm/mach/irq.h>
-#include <asm/mach/time.h>
-
-#include <mach/cputype.h>
-#include <mach/hardware.h>
-#include <mach/time.h>
-
-static struct clock_event_device clockevent_davinci;
-static unsigned int davinci_clock_tick_rate;
-
-/*
- * This driver configures the 2 64-bit count-up timers as 4 independent
- * 32-bit count-up timers used as follows:
- */
-
-enum {
-	TID_CLOCKEVENT,
-	TID_CLOCKSOURCE,
-};
-
-/* Timer register offsets */
-#define PID12			0x0
-#define TIM12			0x10
-#define TIM34			0x14
-#define PRD12			0x18
-#define PRD34			0x1c
-#define TCR			0x20
-#define TGCR			0x24
-#define WDTCR			0x28
-
-/* Offsets of the 8 compare registers */
-#define	CMP12_0			0x60
-#define	CMP12_1			0x64
-#define	CMP12_2			0x68
-#define	CMP12_3			0x6c
-#define	CMP12_4			0x70
-#define	CMP12_5			0x74
-#define	CMP12_6			0x78
-#define	CMP12_7			0x7c
-
-/* Timer register bitfields */
-#define TCR_ENAMODE_DISABLE          0x0
-#define TCR_ENAMODE_ONESHOT          0x1
-#define TCR_ENAMODE_PERIODIC         0x2
-#define TCR_ENAMODE_MASK             0x3
-
-#define TGCR_TIMMODE_SHIFT           2
-#define TGCR_TIMMODE_64BIT_GP        0x0
-#define TGCR_TIMMODE_32BIT_UNCHAINED 0x1
-#define TGCR_TIMMODE_64BIT_WDOG      0x2
-#define TGCR_TIMMODE_32BIT_CHAINED   0x3
-
-#define TGCR_TIM12RS_SHIFT           0
-#define TGCR_TIM34RS_SHIFT           1
-#define TGCR_RESET                   0x0
-#define TGCR_UNRESET                 0x1
-#define TGCR_RESET_MASK              0x3
-
-struct timer_s {
-	char *name;
-	unsigned int id;
-	unsigned long period;
-	unsigned long opts;
-	unsigned long flags;
-	void __iomem *base;
-	unsigned long tim_off;
-	unsigned long prd_off;
-	unsigned long enamode_shift;
-	struct irqaction irqaction;
-};
-static struct timer_s timers[];
-
-/* values for 'opts' field of struct timer_s */
-#define TIMER_OPTS_DISABLED		0x01
-#define TIMER_OPTS_ONESHOT		0x02
-#define TIMER_OPTS_PERIODIC		0x04
-#define TIMER_OPTS_STATE_MASK		0x07
-
-#define TIMER_OPTS_USE_COMPARE		0x80000000
-#define USING_COMPARE(t)		((t)->opts & TIMER_OPTS_USE_COMPARE)
-
-static char *id_to_name[] = {
-	[T0_BOT]	= "timer0_0",
-	[T0_TOP]	= "timer0_1",
-	[T1_BOT]	= "timer1_0",
-	[T1_TOP]	= "timer1_1",
-};
-
-static int timer32_config(struct timer_s *t)
-{
-	u32 tcr;
-	struct davinci_soc_info *soc_info = &davinci_soc_info;
-
-	if (USING_COMPARE(t)) {
-		struct davinci_timer_instance *dtip =
-				soc_info->timer_info->timers;
-		int event_timer = ID_TO_TIMER(timers[TID_CLOCKEVENT].id);
-
-		/*
-		 * Next interrupt should be the current time reg value plus
-		 * the new period (using 32-bit unsigned addition/wrapping
-		 * to 0 on overflow).  This assumes that the clocksource
-		 * is setup to count to 2^32-1 before wrapping around to 0.
-		 */
-		__raw_writel(__raw_readl(t->base + t->tim_off) + t->period,
-			t->base + dtip[event_timer].cmp_off);
-	} else {
-		tcr = __raw_readl(t->base + TCR);
-
-		/* disable timer */
-		tcr &= ~(TCR_ENAMODE_MASK << t->enamode_shift);
-		__raw_writel(tcr, t->base + TCR);
-
-		/* reset counter to zero, set new period */
-		__raw_writel(0, t->base + t->tim_off);
-		__raw_writel(t->period, t->base + t->prd_off);
-
-		/* Set enable mode */
-		if (t->opts & TIMER_OPTS_ONESHOT)
-			tcr |= TCR_ENAMODE_ONESHOT << t->enamode_shift;
-		else if (t->opts & TIMER_OPTS_PERIODIC)
-			tcr |= TCR_ENAMODE_PERIODIC << t->enamode_shift;
-
-		__raw_writel(tcr, t->base + TCR);
-	}
-	return 0;
-}
-
-static inline u32 timer32_read(struct timer_s *t)
-{
-	return __raw_readl(t->base + t->tim_off);
-}
-
-static irqreturn_t timer_interrupt(int irq, void *dev_id)
-{
-	struct clock_event_device *evt = &clockevent_davinci;
-
-	evt->event_handler(evt);
-	return IRQ_HANDLED;
-}
-
-/* called when 32-bit counter wraps */
-static irqreturn_t freerun_interrupt(int irq, void *dev_id)
-{
-	return IRQ_HANDLED;
-}
-
-static struct timer_s timers[] = {
-	[TID_CLOCKEVENT] = {
-		.name      = "clockevent",
-		.opts      = TIMER_OPTS_DISABLED,
-		.irqaction = {
-			.flags   = IRQF_TIMER,
-			.handler = timer_interrupt,
-		}
-	},
-	[TID_CLOCKSOURCE] = {
-		.name       = "free-run counter",
-		.period     = ~0,
-		.opts       = TIMER_OPTS_PERIODIC,
-		.irqaction = {
-			.flags   = IRQF_TIMER,
-			.handler = freerun_interrupt,
-		}
-	},
-};
-
-static void __init timer_init(void)
-{
-	struct davinci_soc_info *soc_info = &davinci_soc_info;
-	struct davinci_timer_instance *dtip = soc_info->timer_info->timers;
-	void __iomem *base[2];
-	int i;
-
-	/* Global init of each 64-bit timer as a whole */
-	for(i=0; i<2; i++) {
-		u32 tgcr;
-
-		base[i] = ioremap(dtip[i].base, SZ_4K);
-		if (WARN_ON(!base[i]))
-			continue;
-
-		/* Disabled, Internal clock source */
-		__raw_writel(0, base[i] + TCR);
-
-		/* reset both timers, no pre-scaler for timer34 */
-		tgcr = 0;
-		__raw_writel(tgcr, base[i] + TGCR);
-
-		/* Set both timers to unchained 32-bit */
-		tgcr = TGCR_TIMMODE_32BIT_UNCHAINED << TGCR_TIMMODE_SHIFT;
-		__raw_writel(tgcr, base[i] + TGCR);
-
-		/* Unreset timers */
-		tgcr |= (TGCR_UNRESET << TGCR_TIM12RS_SHIFT) |
-			(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
-		__raw_writel(tgcr, base[i] + TGCR);
-
-		/* Init both counters to zero */
-		__raw_writel(0, base[i] + TIM12);
-		__raw_writel(0, base[i] + TIM34);
-	}
-
-	/* Init of each timer as a 32-bit timer */
-	for (i=0; i< ARRAY_SIZE(timers); i++) {
-		struct timer_s *t = &timers[i];
-		int timer = ID_TO_TIMER(t->id);
-		u32 irq;
-
-		t->base = base[timer];
-		if (!t->base)
-			continue;
-
-		if (IS_TIMER_BOT(t->id)) {
-			t->enamode_shift = 6;
-			t->tim_off = TIM12;
-			t->prd_off = PRD12;
-			irq = dtip[timer].bottom_irq;
-		} else {
-			t->enamode_shift = 22;
-			t->tim_off = TIM34;
-			t->prd_off = PRD34;
-			irq = dtip[timer].top_irq;
-		}
-
-		/* Register interrupt */
-		t->irqaction.name = t->name;
-		t->irqaction.dev_id = (void *)t;
-
-		if (t->irqaction.handler != NULL) {
-			irq = USING_COMPARE(t) ? dtip[i].cmp_irq : irq;
-			setup_irq(irq, &t->irqaction);
-		}
-	}
-}
-
-/*
- * clocksource
- */
-static u64 read_cycles(struct clocksource *cs)
-{
-	struct timer_s *t = &timers[TID_CLOCKSOURCE];
-
-	return (cycles_t)timer32_read(t);
-}
-
-static struct clocksource clocksource_davinci = {
-	.rating		= 300,
-	.read		= read_cycles,
-	.mask		= CLOCKSOURCE_MASK(32),
-	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-/*
- * Overwrite weak default sched_clock with something more precise
- */
-static u64 notrace davinci_read_sched_clock(void)
-{
-	return timer32_read(&timers[TID_CLOCKSOURCE]);
-}
-
-/*
- * clockevent
- */
-static int davinci_set_next_event(unsigned long cycles,
-				  struct clock_event_device *evt)
-{
-	struct timer_s *t = &timers[TID_CLOCKEVENT];
-
-	t->period = cycles;
-	timer32_config(t);
-	return 0;
-}
-
-static int davinci_shutdown(struct clock_event_device *evt)
-{
-	struct timer_s *t = &timers[TID_CLOCKEVENT];
-
-	t->opts &= ~TIMER_OPTS_STATE_MASK;
-	t->opts |= TIMER_OPTS_DISABLED;
-	return 0;
-}
-
-static int davinci_set_oneshot(struct clock_event_device *evt)
-{
-	struct timer_s *t = &timers[TID_CLOCKEVENT];
-
-	t->opts &= ~TIMER_OPTS_STATE_MASK;
-	t->opts |= TIMER_OPTS_ONESHOT;
-	return 0;
-}
-
-static int davinci_set_periodic(struct clock_event_device *evt)
-{
-	struct timer_s *t = &timers[TID_CLOCKEVENT];
-
-	t->period = davinci_clock_tick_rate / (HZ);
-	t->opts &= ~TIMER_OPTS_STATE_MASK;
-	t->opts |= TIMER_OPTS_PERIODIC;
-	timer32_config(t);
-	return 0;
-}
-
-static struct clock_event_device clockevent_davinci = {
-	.features		= CLOCK_EVT_FEAT_PERIODIC |
-				  CLOCK_EVT_FEAT_ONESHOT,
-	.set_next_event		= davinci_set_next_event,
-	.set_state_shutdown	= davinci_shutdown,
-	.set_state_periodic	= davinci_set_periodic,
-	.set_state_oneshot	= davinci_set_oneshot,
-};
-
-void __init davinci_timer_init(struct clk *timer_clk)
-{
-	struct davinci_soc_info *soc_info = &davinci_soc_info;
-	unsigned int clockevent_id;
-	unsigned int clocksource_id;
-	int i;
-
-	clockevent_id = soc_info->timer_info->clockevent_id;
-	clocksource_id = soc_info->timer_info->clocksource_id;
-
-	timers[TID_CLOCKEVENT].id = clockevent_id;
-	timers[TID_CLOCKSOURCE].id = clocksource_id;
-
-	/*
-	 * If using same timer for both clock events & clocksource,
-	 * a compare register must be used to generate an event interrupt.
-	 * This is equivalent to a oneshot timer only (not periodic).
-	 */
-	if (clockevent_id == clocksource_id) {
-		struct davinci_timer_instance *dtip =
-				soc_info->timer_info->timers;
-		int event_timer = ID_TO_TIMER(clockevent_id);
-
-		/* Only bottom timers can use compare regs */
-		if (IS_TIMER_TOP(clockevent_id))
-			pr_warn("%s: Invalid use of system timers.  Results unpredictable.\n",
-				__func__);
-		else if ((dtip[event_timer].cmp_off == 0)
-				|| (dtip[event_timer].cmp_irq == 0))
-			pr_warn("%s: Invalid timer instance setup.  Results unpredictable.\n",
-				__func__);
-		else {
-			timers[TID_CLOCKEVENT].opts |= TIMER_OPTS_USE_COMPARE;
-			clockevent_davinci.features = CLOCK_EVT_FEAT_ONESHOT;
-		}
-	}
-
-	BUG_ON(IS_ERR(timer_clk));
-	clk_prepare_enable(timer_clk);
-
-	/* init timer hw */
-	timer_init();
-
-	davinci_clock_tick_rate = clk_get_rate(timer_clk);
-
-	/* setup clocksource */
-	clocksource_davinci.name = id_to_name[clocksource_id];
-	if (clocksource_register_hz(&clocksource_davinci,
-				    davinci_clock_tick_rate))
-		pr_err("%s: can't register clocksource!\n",
-		       clocksource_davinci.name);
-
-	sched_clock_register(davinci_read_sched_clock, 32,
-			  davinci_clock_tick_rate);
-
-	/* setup clockevent */
-	clockevent_davinci.name = id_to_name[timers[TID_CLOCKEVENT].id];
-
-	clockevent_davinci.cpumask = cpumask_of(0);
-	clockevents_config_and_register(&clockevent_davinci,
-					davinci_clock_tick_rate, 1, 0xfffffffe);
-
-	for (i=0; i< ARRAY_SIZE(timers); i++)
-		timer32_config(&timers[i]);
-}
-- 
2.20.1

Re: [PATCH v2 01/12] ARM: dts: da850: fix interrupt numbers for clocksource

[David Lechner]

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> The timer interrupts specified in commit 3652e2741f42 ("ARM: dts:
> da850: Add clocks") are wrong but since the current timer code
> hard-codes them, the bug was never spotted.
> 
> This patch must go into stable since, once we introduce a proper
> clocksource driver, devices with buggy device tree will stop booting.
> 
> Fixes: 3652e2741f42 ("ARM: dts: da850: Add clocks")
> Cc: stable@vger.kernel.org
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---

Reviewed-by: David Lechner <david@lechnology.com>

Re: [PATCH v2 02/12] clocksource: davinci-timer: new driver

[David Lechner]

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> Currently the clocksource and clockevent support for davinci platforms
> lives in mach-davinci. It hard-codes many things, used global variables,
> implements functionalities unused by any platform and has code fragments
> scattered across many (often unrelated) files.
> 
> Implement a new, modern and simplified timer driver and put it into
> drivers/clocksource. We still need to support legacy board files so
> export a config structure and a function that allows machine code to
> register the timer.
> 
> We don't bother freeing resources on errors in davinci_timer_register()
> as the system won't boot without a timer anyway.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---

...

> diff --git a/drivers/clocksource/timer-davinci.c b/drivers/clocksource/timer-davinci.c
> new file mode 100644
> index 000000000000..a6d2d3f6526e
> --- /dev/null
> +++ b/drivers/clocksource/timer-davinci.c
> @@ -0,0 +1,431 @@
> +// SPDX-License-Identifier: GPL-2.0

GPL-2.0-only ?

> +//
> +// TI DaVinci clocksource driver
> +//
> +// Copyright (C) 2019 Texas Instruments
> +// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> +// (with some parts adopted from code by Kevin Hilman <khilman@baylibre.com>)
> +
> +#include <linux/clk.h>
> +#include <linux/clockchips.h>
> +#include <linux/clocksource.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/sched_clock.h>
> +
> +#include <clocksource/timer-davinci.h>
> +
> +#define DAVINCI_TIMER_REG_TIM12			0x10
> +#define DAVINCI_TIMER_REG_TIM34			0x14
> +#define DAVINCI_TIMER_REG_PRD12			0x18
> +#define DAVINCI_TIMER_REG_PRD34			0x1c
> +#define DAVINCI_TIMER_REG_TCR			0x20
> +#define DAVINCI_TIMER_REG_TGCR			0x24
> +
> +#define DAVINCI_TIMER_TIMMODE_MASK		GENMASK(3, 2)
> +#define DAVINCI_TIMER_RESET_MASK		GENMASK(1, 0)
> +#define DAVINCI_TIMER_TIMMODE_32BIT_UNCHAINED	BIT(2)
> +#define DAVINCI_TIMER_UNRESET			GENMASK(1, 0)
> +
> +/* Shift depends on timer. */
> +#define DAVINCI_TIMER_ENAMODE_MASK		GENMASK(1, 0)


> +#define DAVINCI_TIMER_ENAMODE_DISABLED		0x00
> +#define DAVINCI_TIMER_ENAMODE_ONESHOT		BIT(0)
> +#define DAVINCI_TIMER_ENAMODE_PERIODIC		BIT(1)

Are these 3 values essentially an enum of exclusive values?
If so, the the BIT() macro doesn't seem right here. If they
are flags, then BIT() is OK, but DAVINCI_TIMER_ENAMODE_DISABLED
could be omitted.

> +
> +#define DAVINCI_TIMER_ENAMODE_SHIFT_TIM12	6
> +#define DAVINCI_TIMER_ENAMODE_SHIFT_TIM34	22
> +
> +#define DAVINCI_TIMER_MIN_DELTA			0x01
> +#define DAVINCI_TIMER_MAX_DELTA			0xfffffffe
> +
> +#define DAVINCI_TIMER_CLKSRC_BITS		32
> +
> +#define DAVINCI_TIMER_TGCR_DEFAULT \
> +		(DAVINCI_TIMER_TIMMODE_32BIT_UNCHAINED | DAVINCI_TIMER_UNRESET)
> +
> +enum {
> +	DAVINCI_TIMER_MODE_DISABLED = 0,
> +	DAVINCI_TIMER_MODE_ONESHOT,
> +	DAVINCI_TIMER_MODE_PERIODIC,
> +};
> +
> +struct davinci_timer_data;
> +
> +typedef void (*davinci_timer_set_period_func)(struct davinci_timer_data *,
> +					      unsigned int period);
> +
> +struct davinci_timer_regs {
> +	unsigned int tim_off;> +	unsigned int prd_off;

It is not obvious to me what the abbreviations tim and prd
mean. Add comments or change the names?

> +	unsigned int enamode_shift;
> +};
> +

...

> +static void davinci_timer_update(struct davinci_timer_data *timer,
> +				 unsigned int reg, unsigned int mask,
> +				 unsigned int val)
> +{
> +	unsigned int new, orig = davinci_timer_read(timer, reg);

Slightly more readable with function not in variable declaration?

> +
> +	new = orig & ~mask;
> +	new |= val & mask;
> +
> +	davinci_timer_write(timer, reg, new);
> +}

...

> +int __init davinci_timer_register(struct clk *clk,
> +				  const struct davinci_timer_cfg *timer_cfg)
> +{
> +	struct davinci_timer_clocksource *clocksource;
> +	struct davinci_timer_clockevent *clockevent;
> +	void __iomem *base;
> +	int rv;
> +
> +	rv = clk_prepare_enable(clk);
> +	if (rv) {
> +		pr_err("%s: Unable to prepare and enable the timer clock\n",

use pr_fmt marco to simplify? e.g. at the top of the file...

#define pr_fmt(fmt)    "%s: " fmt "\n", __func__

Then just

		pr_err("Unable to prepare and enable the timer clock");


> +		       __func__);
> +		return rv;
> +	}

...

> diff --git a/include/clocksource/timer-davinci.h b/include/clocksource/timer-davinci.h
> new file mode 100644
> index 000000000000..ef1de78a1820
> --- /dev/null
> +++ b/include/clocksource/timer-davinci.h
> @@ -0,0 +1,44 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */

Seems odd to have the header GPL-2.0+ when the c file GPL-2.0-only

> +/*
> + * TI DaVinci clocksource driver
> + *
> + * Copyright (C) 2019 Texas Instruments
> + * Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> + */
> +
> +#ifndef __TIMER_DAVINCI_H__
> +#define __TIMER_DAVINCI_H__
> +
> +#include <linux/clk.h>
> +#include <linux/ioport.h>
> +
> +enum {
> +	DAVINCI_TIMER_CLOCKEVENT_IRQ = 0,

Isn't = 0 implied, so can be omitted?

> +	DAVINCI_TIMER_CLOCKSOURCE_IRQ,
> +	DAVINCI_TIMER_NUM_IRQS,
> +};
> +
> +/**
> + * struct davinci_timer_cfg - davinci clocksource driver configuration struct
> + * @reg:        register range resource
> + * @irq:        clockevent and clocksource interrupt resources
> + * @cmp_off:    if set - it specifies the compare register used for clockevent
> + *
> + * Note: if the compare register is specified, the driver will use the bottom
> + * clock half for both clocksource and clockevent and the compare register
> + * to generate event irqs. The user must supply the correct compare register
> + * interrupt number.

I'm a little confused by this comment. I think I get it, but it took me a while.

If cmp_off is 0, we don't use the compare register and therefore
DAVINCI_TIMER_CLOCKEVENT_IRQ and DAVINCI_TIMER_CLOCKSOURCE_IRQ should
be TINT12 and TINT34 (or vice versa?). If cmp_off is non-zero, then
it should be one of the 8 (more or less depending on the SoC) and
DAVINCI_TIMER_CLOCKEVENT_IRQ should be something like T12CMPINT0.

> + *
> + * This is only used by da830 the DSP of which uses the top half. The timer
> + * driver still configures the top half to run in free-run mode.
> + */
> +struct davinci_timer_cfg {
> +	struct resource reg;
> +	struct resource irq[DAVINCI_TIMER_NUM_IRQS];
> +	unsigned int cmp_off;
> +};
> +
> +int __init davinci_timer_register(struct clk *clk,
> +				  const struct davinci_timer_cfg *data);
> +
> +#endif /* __TIMER_DAVINCI_H__ */
> 

Re: [PATCH v2 03/12] ARM: davinci: enable the clocksource driver for DT mode

[David Lechner]

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> Switch all davinci boards using device tree to using the new
> clocksource driver: remove the previous OF_TIMER_DECLARE() from
> mach-davinci and select davinci-timer to be built for
> davinci_all_defconfig.

I don't see how this patch is related to davinci_all_defconfig.
It looks like the new driver is just selected when ARCH_DAVINCI
is selected in Kconfig.

> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---

Re: [PATCH v2 04/12] ARM: davinci: WARN_ON() if clk_get() fails

[David Lechner]

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> Currently the timer code checks if the clock pointer passed to it is
> good (!IS_ERR(clk)). The new clocksource driver expects the clock to
> be functional and doesn't perform any checks so emit a warning if
> clk_get() fails. Apply this to all davinci platforms.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>   arch/arm/mach-davinci/da830.c  | 4 ++++
>   arch/arm/mach-davinci/da850.c  | 4 ++++
>   arch/arm/mach-davinci/dm355.c  | 4 ++++
>   arch/arm/mach-davinci/dm365.c  | 4 ++++
>   arch/arm/mach-davinci/dm644x.c | 4 ++++
>   arch/arm/mach-davinci/dm646x.c | 4 ++++
>   6 files changed, 24 insertions(+)
> 
> diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
> index 2cc9fe4c3a91..9a4b749cbb6b 100644
> --- a/arch/arm/mach-davinci/da830.c
> +++ b/arch/arm/mach-davinci/da830.c
> @@ -834,6 +834,10 @@ void __init da830_init_time(void)
>   	da830_pll_init(NULL, pll, NULL);
>   
>   	clk = clk_get(NULL, "timer0");
> +	if (WARN_ON(IS_ERR(clk))) {
> +		pr_err("Unable to get the timer clock\n");

Do we really need a warning _and_ an error?

> +		return;
> +	}
>   
>   	davinci_timer_init(clk);
>   }

Re: [PATCH v2 05/12] ARM: davinci: da850: switch to using the clocksource driver

[David Lechner]

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> We now have a proper clocksource driver for davinci. Switch the platform
> to using it.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>   arch/arm/mach-davinci/da850.c | 56 ++++++++++++++---------------------
>   1 file changed, 22 insertions(+), 34 deletions(-)
> 
> diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
> index beb34ee42e3a..66c2ffd4885b 100644
> --- a/arch/arm/mach-davinci/da850.c
> +++ b/arch/arm/mach-davinci/da850.c
> @@ -34,7 +34,8 @@
>   #include <mach/da8xx.h>
>   #include <mach/irqs.h>
>   #include <mach/pm.h>
> -#include <mach/time.h>
> +
> +#include <clocksource/timer-davinci.h>
>   
>   #include "mux.h"
>   
> @@ -436,38 +437,24 @@ static struct davinci_id da850_ids[] = {
>   	},
>   };
>   
> -static struct davinci_timer_instance da850_timer_instance[4] = {
> -	{
> -		.base		= DA8XX_TIMER64P0_BASE,
> -		.bottom_irq	= IRQ_DA8XX_TINT12_0,
> -		.top_irq	= IRQ_DA8XX_TINT34_0,
> -	},
> -	{
> -		.base		= DA8XX_TIMER64P1_BASE,
> -		.bottom_irq	= IRQ_DA8XX_TINT12_1,
> -		.top_irq	= IRQ_DA8XX_TINT34_1,
> -	},
> -	{
> -		.base		= DA850_TIMER64P2_BASE,
> -		.bottom_irq	= IRQ_DA850_TINT12_2,
> -		.top_irq	= IRQ_DA850_TINT34_2,
> -	},
> -	{
> -		.base		= DA850_TIMER64P3_BASE,
> -		.bottom_irq	= IRQ_DA850_TINT12_3,
> -		.top_irq	= IRQ_DA850_TINT34_3,
> +static const struct davinci_timer_cfg da850_timer_cfg = {
> +	.reg = {
> +		.start		= DA8XX_TIMER64P0_BASE,
> +		.end		= DA8XX_TIMER64P0_BASE + SZ_4K,

Missing minus one?

+		.end		= DA8XX_TIMER64P0_BASE + SZ_4K - 1,


> +		.flags		= IORESOURCE_MEM,
>   	},
> -};
> -
> -/*
> - * T0_BOT: Timer 0, bottom		: Used for clock_event
> - * T0_TOP: Timer 0, top			: Used for clocksource
> - * T1_BOT, T1_TOP: Timer 1, bottom & top: Used for watchdog timer
> - */
> -static struct davinci_timer_info da850_timer_info = {
> -	.timers		= da850_timer_instance,
> -	.clockevent_id	= T0_BOT,
> -	.clocksource_id	= T0_TOP,
> +	.irq = {
> +		{

It would be nice to use the enum values from <clocksource/timer-davinci.h>
here so we know which IRQ is which.

		[DAVINCI_TIMER_CLOCKEVENT_IRQ] = {

> +			.start	= IRQ_DA8XX_TINT12_0,
> +			.end	= IRQ_DA8XX_TINT12_0,

Can .end be omitted since it is the same as .start?

> +			.flags	= IORESOURCE_IRQ,
> +		},
> +		{

		[DAVINCI_TIMER_CLOCKSOURCE_IRQ] = {

> +			.start	= IRQ_DA8XX_TINT34_0,
> +			.end	= IRQ_DA8XX_TINT34_0,
> +			.flags	= IORESOURCE_IRQ,
> +		}
> +	}
>   };
>   
>   #ifdef CONFIG_CPU_FREQ
> @@ -742,7 +729,6 @@ static const struct davinci_soc_info davinci_soc_info_da850 = {
>   	.intc_type		= DAVINCI_INTC_TYPE_CP_INTC,
>   	.intc_irq_prios		= da850_default_priorities,
>   	.intc_irq_num		= DA850_N_CP_INTC_IRQ,
> -	.timer_info		= &da850_timer_info,
>   	.emac_pdata		= &da8xx_emac_pdata,
>   	.sram_dma		= DA8XX_SHARED_RAM_BASE,
>   	.sram_len		= SZ_128K,
> @@ -765,6 +751,7 @@ void __init da850_init_time(void)
>   	void __iomem *pll0;
>   	struct regmap *cfgchip;
>   	struct clk *clk;
> +	int rv;

bikeshed: int ret; and int err; are used way more often, so rv looks
strange to me.

>   
>   	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, DA850_REF_FREQ);
>   
> @@ -779,7 +766,8 @@ void __init da850_init_time(void)
>   		return;
>   	}
>   
> -	davinci_timer_init(clk);
> +	rv = davinci_timer_register(clk, &da850_timer_cfg);
> +	WARN(rv, "Unable to register the timer: %d\n", rv);
>   }
>   
>   static struct resource da850_pll1_resources[] = {
> 

Re: [PATCH v2 06/12] ARM: davinci: da830: switch to using the clocksource driver

[David Lechner]

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> We now have a proper clocksource driver for davinci. Switch the platform
> to using it.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---

same comments as da850 patch

Re: [PATCH v2 02/12] clocksource: davinci-timer: new driver

[David Lechner]

On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> Currently the clocksource and clockevent support for davinci platforms
> lives in mach-davinci. It hard-codes many things, used global variables,

s/used/uses/

> implements functionalities unused by any platform and has code fragments
> scattered across many (often unrelated) files.
> 

Re: [PATCH v2 05/12] ARM: davinci: da850: switch to using the clocksource driver

[Sekhar Nori]

On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
> +static const struct davinci_timer_cfg da850_timer_cfg = {
> +	.reg = {
> +		.start		= DA8XX_TIMER64P0_BASE,
> +		.end		= DA8XX_TIMER64P0_BASE + SZ_4K,

SZ_4K - 1

This should have prevented watchdog timer from getting registered.

Thanks,
Sekhar

Re: [PATCH v2 06/12] ARM: davinci: da830: switch to using the clocksource driver

[Sekhar Nori]

On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
> -/*
> - * T0_BOT: Timer 0, bottom		: Used for clock_event & clocksource
> - * T0_TOP: Timer 0, top			: Used by DSP
> - * T1_BOT, T1_TOP: Timer 1, bottom & top: Used for watchdog timer

Aren't we changing this usage model for DA830 now, leaving no clock for
use by DSP? It seems to me that after these patches clockevent is always
T0_BOT and clocksource is always T0_TOP.

Thanks,
Sekhar

Re: [PATCH v2 08/12] ARM: davinci: dm355: switch to using the clocksource driver

[Sekhar Nori]

On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
> -/*
> - * T0_BOT: Timer 0, bottom:  clockevent source for hrtimers
> - * T0_TOP: Timer 0, top   :  clocksource for generic timekeeping
> - * T1_BOT: Timer 1, bottom:  (used by DSP in TI DSPLink code)
> - * T1_TOP: Timer 1, top   :  <unused>

Documenting this timer division is important because DSP usage and
unused timers are not immediately clear from kernel code alone. Can you
retain these comments in all patches of this series (I guess T0_BOT etc.
terminology is changed, so feel free to adjust the comment text).

> - */
> -static struct davinci_timer_info dm355_timer_info = {
> -	.timers		= davinci_timer_instance,
> -	.clockevent_id	= T0_BOT,
> -	.clocksource_id	= T0_TOP,
> +static const struct davinci_timer_cfg dm355_timer_cfg = {
> +	.reg = {
> +		.start		= DAVINCI_TIMER0_BASE,
> +		.end		= DAVINCI_TIMER0_BASE + SZ_4K,

Here and other places too, SZ_4K - 1

Thanks,
Sekhar

Re: [PATCH v2 05/12] ARM: davinci: da850: switch to using the clocksource driver

[Bartosz Golaszewski]

pt., 8 lut 2019 o 13:06 Sekhar Nori <nsekhar@ti.com> napisał(a):
>
> On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
> > +static const struct davinci_timer_cfg da850_timer_cfg = {
> > +     .reg = {
> > +             .start          = DA8XX_TIMER64P0_BASE,
> > +             .end            = DA8XX_TIMER64P0_BASE + SZ_4K,
>
> SZ_4K - 1
>
> This should have prevented watchdog timer from getting registered.
>
> Thanks,
> Sekhar

My clocksource driver doesn't call request_region() so a subsequent
devm_ioremap_resource() in the watchdog driver would still succeed. I
now fixed both the missing call and the value here.

Bart

Re: [PATCH v2 05/12] ARM: davinci: da850: switch to using the clocksource driver

[Sekhar Nori]

On 08/02/19 6:04 PM, Bartosz Golaszewski wrote:
> pt., 8 lut 2019 o 13:06 Sekhar Nori <nsekhar@ti.com> napisał(a):
>>
>> On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
>>> +static const struct davinci_timer_cfg da850_timer_cfg = {
>>> +     .reg = {
>>> +             .start          = DA8XX_TIMER64P0_BASE,
>>> +             .end            = DA8XX_TIMER64P0_BASE + SZ_4K,
>>
>> SZ_4K - 1
>>
>> This should have prevented watchdog timer from getting registered.
>>
>> Thanks,
>> Sekhar
> 
> My clocksource driver doesn't call request_region() so a subsequent
> devm_ioremap_resource() in the watchdog driver would still succeed. I
> now fixed both the missing call and the value here.

Ah, got it. Perhaps a call to request_region() should be added to catch
issues?

Thanks,
Sekhar

Re: [PATCH v2 06/12] ARM: davinci: da830: switch to using the clocksource driver

[Bartosz Golaszewski]

pt., 8 lut 2019 o 13:23 Sekhar Nori <nsekhar@ti.com> napisał(a):
>
> On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
> > -/*
> > - * T0_BOT: Timer 0, bottom           : Used for clock_event & clocksource
> > - * T0_TOP: Timer 0, top                      : Used by DSP
> > - * T1_BOT, T1_TOP: Timer 1, bottom & top: Used for watchdog timer
>
> Aren't we changing this usage model for DA830 now, leaving no clock for
> use by DSP? It seems to me that after these patches clockevent is always
> T0_BOT and clocksource is always T0_TOP.
>
> Thanks,
> Sekhar

No it's still the same. I added some comments to the driver's header in v2.

Bart

Re: [PATCH v2 05/12] ARM: davinci: da850: switch to using the clocksource driver

[Bartosz Golaszewski]

pt., 8 lut 2019 o 13:37 Sekhar Nori <nsekhar@ti.com> napisał(a):
>
> On 08/02/19 6:04 PM, Bartosz Golaszewski wrote:
> > pt., 8 lut 2019 o 13:06 Sekhar Nori <nsekhar@ti.com> napisał(a):
> >>
> >> On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
> >>> +static const struct davinci_timer_cfg da850_timer_cfg = {
> >>> +     .reg = {
> >>> +             .start          = DA8XX_TIMER64P0_BASE,
> >>> +             .end            = DA8XX_TIMER64P0_BASE + SZ_4K,
> >>
> >> SZ_4K - 1
> >>
> >> This should have prevented watchdog timer from getting registered.
> >>
> >> Thanks,
> >> Sekhar
> >
> > My clocksource driver doesn't call request_region() so a subsequent
> > devm_ioremap_resource() in the watchdog driver would still succeed. I
> > now fixed both the missing call and the value here.
>
> Ah, got it. Perhaps a call to request_region() should be added to catch
> issues?
>

Yes, that's what I meant by "fixing the missing call". It will be
there in v3. Actually the kernel seems to be missing a non-managed
ioremap_resource() helper. Maybe I should add it as well.

Bart

Re: [PATCH v2 01/12] ARM: dts: da850: fix interrupt numbers for clocksource

[Sekhar Nori]

On 05/02/19 6:48 AM, David Lechner wrote:
> On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
>> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>>
>> The timer interrupts specified in commit 3652e2741f42 ("ARM: dts:
>> da850: Add clocks") are wrong but since the current timer code
>> hard-codes them, the bug was never spotted.
>>
>> This patch must go into stable since, once we introduce a proper
>> clocksource driver, devices with buggy device tree will stop booting.
>>
>> Fixes: 3652e2741f42 ("ARM: dts: da850: Add clocks")
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>> ---
> 
> Reviewed-by: David Lechner <david@lechnology.com>

This patch is already in ARM SoC. Should be soon in Linus's tree too.

https://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git/commit/?h=fixes&id=e3966a766865da7ced1dece663697861dd5cf103

Thanks,
Sekhar

Re: [PATCH v2 02/12] clocksource: davinci-timer: new driver

[Sekhar Nori]

On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:

> +static unsigned int davinci_timer_read(struct davinci_timer_data *timer,
> +				       unsigned int reg)
> +{
> +	return __raw_readl(timer->base + reg);
> +}
> +
> +static void davinci_timer_write(struct davinci_timer_data *timer,
> +				unsigned int reg, unsigned int val)
> +{
> +	__raw_writel(val, timer->base + reg);
> +}

Since its a new driver, please use readl_relaxed() and writel_relaxed().

> +static void davinci_timer_init(void __iomem *base)
> +{
> +	/* Set clock to internal mode and disable it. */
> +	__raw_writel(0x0, base + DAVINCI_TIMER_REG_TCR);
> +	/*
> +	 * Reset both 32-bit timers, set no prescaler for timer 34, set the
> +	 * timer to dual 32-bit unchained mode, unreset both 32-bit timers.
> +	 */
> +	__raw_writel(DAVINCI_TIMER_TGCR_DEFAULT, base + DAVINCI_TIMER_REG_TGCR);
> +	/* Init both counters to zero. */
> +	__raw_writel(0x0, base + DAVINCI_TIMER_REG_TIM12);
> +	__raw_writel(0x0, base + DAVINCI_TIMER_REG_TIM34);

here too.

> +}
> +
> +int __init davinci_timer_register(struct clk *clk,
> +				  const struct davinci_timer_cfg *timer_cfg)
> +{

[...]

> +	clocksource = kzalloc(sizeof(*clocksource), GFP_KERNEL);
> +	if (!clocksource) {
> +		pr_err("%s: Error allocating memory for clocksource data\n",
> +		       __func__);
> +		return -ENOMEM;
> +	}
> +
> +	clocksource->dev.name = "tim34";
> +	clocksource->dev.rating = 300;
> +	clocksource->dev.read = davinci_timer_clksrc_read;
> +	clocksource->dev.mask = CLOCKSOURCE_MASK(DAVINCI_TIMER_CLKSRC_BITS);
> +	clocksource->dev.flags = CLOCK_SOURCE_IS_CONTINUOUS;
> +	clocksource->timer.set_period = davinci_timer_set_period_std;
> +	clocksource->timer.mode = DAVINCI_TIMER_MODE_PERIODIC;
> +	clocksource->timer.base = base;
> +
> +	if (timer_cfg->cmp_off)
> +		clocksource->timer.regs = &davinci_timer_tim12_regs;
> +	else
> +		clocksource->timer.regs = &davinci_timer_tim34_regs;

We should set clocksource->dev.name based on cmp_off too, otherwise it
will be confusing to have a device called "tim34" using tim12 registers.

> +/**
> + * struct davinci_timer_cfg - davinci clocksource driver configuration struct
> + * @reg:        register range resource
> + * @irq:        clockevent and clocksource interrupt resources
> + * @cmp_off:    if set - it specifies the compare register used for clockevent
> + *
> + * Note: if the compare register is specified, the driver will use the bottom
> + * clock half for both clocksource and clockevent and the compare register
> + * to generate event irqs. The user must supply the correct compare register
> + * interrupt number.
> + *
> + * This is only used by da830 the DSP of which uses the top half. The timer
> + * driver still configures the top half to run in free-run mode.

This note helps. Thanks!

Regards,
Sekhar

Re: [PATCH v2 04/12] ARM: davinci: WARN_ON() if clk_get() fails

[Bartosz Golaszewski]

wt., 5 lut 2019 o 03:18 David Lechner <david@lechnology.com> napisał(a):
>
> On 2/4/19 11:17 AM, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > Currently the timer code checks if the clock pointer passed to it is
> > good (!IS_ERR(clk)). The new clocksource driver expects the clock to
> > be functional and doesn't perform any checks so emit a warning if
> > clk_get() fails. Apply this to all davinci platforms.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > ---
> >   arch/arm/mach-davinci/da830.c  | 4 ++++
> >   arch/arm/mach-davinci/da850.c  | 4 ++++
> >   arch/arm/mach-davinci/dm355.c  | 4 ++++
> >   arch/arm/mach-davinci/dm365.c  | 4 ++++
> >   arch/arm/mach-davinci/dm644x.c | 4 ++++
> >   arch/arm/mach-davinci/dm646x.c | 4 ++++
> >   6 files changed, 24 insertions(+)
> >
> > diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
> > index 2cc9fe4c3a91..9a4b749cbb6b 100644
> > --- a/arch/arm/mach-davinci/da830.c
> > +++ b/arch/arm/mach-davinci/da830.c
> > @@ -834,6 +834,10 @@ void __init da830_init_time(void)
> >       da830_pll_init(NULL, pll, NULL);
> >
> >       clk = clk_get(NULL, "timer0");
> > +     if (WARN_ON(IS_ERR(clk))) {
> > +             pr_err("Unable to get the timer clock\n");
>
> Do we really need a warning _and_ an error?
>

That will give us the reason AND point us to the right place in the code.

Bart

> > +             return;
> > +     }
> >
> >       davinci_timer_init(clk);
> >   }

Re: [PATCH v2 08/12] ARM: davinci: dm355: switch to using the clocksource driver

[Bartosz Golaszewski]

pt., 8 lut 2019 o 13:34 Sekhar Nori <nsekhar@ti.com> napisał(a):
>
> On 04/02/19 10:47 PM, Bartosz Golaszewski wrote:
> > -/*
> > - * T0_BOT: Timer 0, bottom:  clockevent source for hrtimers
> > - * T0_TOP: Timer 0, top   :  clocksource for generic timekeeping
> > - * T1_BOT: Timer 1, bottom:  (used by DSP in TI DSPLink code)
> > - * T1_TOP: Timer 1, top   :  <unused>
>
> Documenting this timer division is important because DSP usage and
> unused timers are not immediately clear from kernel code alone. Can you
> retain these comments in all patches of this series (I guess T0_BOT etc.
> terminology is changed, so feel free to adjust the comment text).
>
> > - */
> > -static struct davinci_timer_info dm355_timer_info = {
> > -     .timers         = davinci_timer_instance,
> > -     .clockevent_id  = T0_BOT,
> > -     .clocksource_id = T0_TOP,
> > +static const struct davinci_timer_cfg dm355_timer_cfg = {
> > +     .reg = {
> > +             .start          = DAVINCI_TIMER0_BASE,
> > +             .end            = DAVINCI_TIMER0_BASE + SZ_4K,
>
> Here and other places too, SZ_4K - 1
>
> Thanks,
> Sekhar

I used appropriate DEFINE_RES_x() macros instead.

Bart