ARM: at91: PIT: Move the driver to drivers/clocksource

Now that we don't depend on anyting in the mach-at91 directory, we can just
move the driver to where it belongs.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

Conflicts:
	arch/arm/mach-at91/Kconfig
	arch/arm/mach-at91/Makefile

1 files changed, 0 insertions, 296 deletions

diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
deleted file mode 100644
index d5289098b3df..000000000000
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ /dev/null
@@ -1,296 +0,0 @@
-/*
- * at91sam926x_time.c - Periodic Interval Timer (PIT) for at91sam926x
- *
- * Copyright (C) 2005-2006 M. Amine SAYA, ATMEL Rousset, France
- * Revision	 2005 M. Nicolas Diremdjian, ATMEL Rousset, France
- * Converted to ClockSource/ClockEvents by David Brownell.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#define pr_fmt(fmt)	"AT91: PIT: " fmt
-
-#include <linux/clk.h>
-#include <linux/clockchips.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/kernel.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/slab.h>
-
-#define AT91_PIT_MR		0x00			/* Mode Register */
-#define AT91_PIT_PITIEN			BIT(25)			/* Timer Interrupt Enable */
-#define AT91_PIT_PITEN			BIT(24)			/* Timer Enabled */
-#define AT91_PIT_PIV			GENMASK(19, 0)		/* Periodic Interval Value */
-
-#define AT91_PIT_SR		0x04			/* Status Register */
-#define AT91_PIT_PITS			BIT(0)			/* Timer Status */
-
-#define AT91_PIT_PIVR		0x08			/* Periodic Interval Value Register */
-#define AT91_PIT_PIIR		0x0c			/* Periodic Interval Image Register */
-#define AT91_PIT_PICNT			GENMASK(31, 20)		/* Interval Counter */
-#define AT91_PIT_CPIV			GENMASK(19, 0)		/* Inverval Value */
-
-#define PIT_CPIV(x)	((x) & AT91_PIT_CPIV)
-#define PIT_PICNT(x)	(((x) & AT91_PIT_PICNT) >> 20)
-
-struct pit_data {
-	struct clock_event_device	clkevt;
-	struct clocksource		clksrc;
-
-	void __iomem	*base;
-	u32		cycle;
-	u32		cnt;
-	unsigned int	irq;
-	struct clk	*mck;
-};
-
-static inline struct pit_data *clksrc_to_pit_data(struct clocksource *clksrc)
-{
-	return container_of(clksrc, struct pit_data, clksrc);
-}
-
-static inline struct pit_data *clkevt_to_pit_data(struct clock_event_device *clkevt)
-{
-	return container_of(clkevt, struct pit_data, clkevt);
-}
-
-static inline unsigned int pit_read(void __iomem *base, unsigned int reg_offset)
-{
-	return __raw_readl(base + reg_offset);
-}
-
-static inline void pit_write(void __iomem *base, unsigned int reg_offset, unsigned long value)
-{
-	__raw_writel(value, base + reg_offset);
-}
-
-/*
- * Clocksource:  just a monotonic counter of MCK/16 cycles.
- * We don't care whether or not PIT irqs are enabled.
- */
-static cycle_t read_pit_clk(struct clocksource *cs)
-{
-	struct pit_data *data = clksrc_to_pit_data(cs);
-	unsigned long flags;
-	u32 elapsed;
-	u32 t;
-
-	raw_local_irq_save(flags);
-	elapsed = data->cnt;
-	t = pit_read(data->base, AT91_PIT_PIIR);
-	raw_local_irq_restore(flags);
-
-	elapsed += PIT_PICNT(t) * data->cycle;
-	elapsed += PIT_CPIV(t);
-	return elapsed;
-}
-
-/*
- * Clockevent device:  interrupts every 1/HZ (== pit_cycles * MCK/16)
- */
-static void
-pit_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
-{
-	struct pit_data *data = clkevt_to_pit_data(dev);
-
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		/* update clocksource counter */
-		data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
-		pit_write(data->base, AT91_PIT_MR,
-			  (data->cycle - 1) | AT91_PIT_PITEN | AT91_PIT_PITIEN);
-		break;
-	case CLOCK_EVT_MODE_ONESHOT:
-		BUG();
-		/* FALLTHROUGH */
-	case CLOCK_EVT_MODE_SHUTDOWN:
-	case CLOCK_EVT_MODE_UNUSED:
-		/* disable irq, leaving the clocksource active */
-		pit_write(data->base, AT91_PIT_MR,
-			  (data->cycle - 1) | AT91_PIT_PITEN);
-		break;
-	case CLOCK_EVT_MODE_RESUME:
-		break;
-	}
-}
-
-static void at91sam926x_pit_suspend(struct clock_event_device *cedev)
-{
-	struct pit_data *data = clkevt_to_pit_data(cedev);
-
-	/* Disable timer */
-	pit_write(data->base, AT91_PIT_MR, 0);
-}
-
-static void at91sam926x_pit_reset(struct pit_data *data)
-{
-	/* Disable timer and irqs */
-	pit_write(data->base, AT91_PIT_MR, 0);
-
-	/* Clear any pending interrupts, wait for PIT to stop counting */
-	while (PIT_CPIV(pit_read(data->base, AT91_PIT_PIVR)) != 0)
-		cpu_relax();
-
-	/* Start PIT but don't enable IRQ */
-	pit_write(data->base, AT91_PIT_MR,
-		  (data->cycle - 1) | AT91_PIT_PITEN);
-}
-
-static void at91sam926x_pit_resume(struct clock_event_device *cedev)
-{
-	struct pit_data *data = clkevt_to_pit_data(cedev);
-
-	at91sam926x_pit_reset(data);
-}
-
-/*
- * IRQ handler for the timer.
- */
-static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id)
-{
-	struct pit_data *data = dev_id;
-
-	/*
-	 * irqs should be disabled here, but as the irq is shared they are only
-	 * guaranteed to be off if the timer irq is registered first.
-	 */
-	WARN_ON_ONCE(!irqs_disabled());
-
-	/* The PIT interrupt may be disabled, and is shared */
-	if ((data->clkevt.mode == CLOCK_EVT_MODE_PERIODIC) &&
-	    (pit_read(data->base, AT91_PIT_SR) & AT91_PIT_PITS)) {
-		unsigned nr_ticks;
-
-		/* Get number of ticks performed before irq, and ack it */
-		nr_ticks = PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
-		do {
-			data->cnt += data->cycle;
-			data->clkevt.event_handler(&data->clkevt);
-			nr_ticks--;
-		} while (nr_ticks);
-
-		return IRQ_HANDLED;
-	}
-
-	return IRQ_NONE;
-}
-
-/*
- * Set up both clocksource and clockevent support.
- */
-static void __init at91sam926x_pit_common_init(struct pit_data *data)
-{
-	unsigned long	pit_rate;
-	unsigned	bits;
-	int		ret;
-
-	/*
-	 * Use our actual MCK to figure out how many MCK/16 ticks per
-	 * 1/HZ period (instead of a compile-time constant LATCH).
-	 */
-	pit_rate = clk_get_rate(data->mck) / 16;
-	data->cycle = DIV_ROUND_CLOSEST(pit_rate, HZ);
-	WARN_ON(((data->cycle - 1) & ~AT91_PIT_PIV) != 0);
-
-	/* Initialize and enable the timer */
-	at91sam926x_pit_reset(data);
-
-	/*
-	 * Register clocksource.  The high order bits of PIV are unused,
-	 * so this isn't a 32-bit counter unless we get clockevent irqs.
-	 */
-	bits = 12 /* PICNT */ + ilog2(data->cycle) /* PIV */;
-	data->clksrc.mask = CLOCKSOURCE_MASK(bits);
-	data->clksrc.name = "pit";
-	data->clksrc.rating = 175;
-	data->clksrc.read = read_pit_clk,
-	data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS,
-	clocksource_register_hz(&data->clksrc, pit_rate);
-
-	/* Set up irq handler */
-	ret = request_irq(data->irq, at91sam926x_pit_interrupt,
-			  IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
-			  "at91_tick", data);
-	if (ret)
-		panic(pr_fmt("Unable to setup IRQ\n"));
-
-	/* Set up and register clockevents */
-	data->clkevt.name = "pit";
-	data->clkevt.features = CLOCK_EVT_FEAT_PERIODIC;
-	data->clkevt.shift = 32;
-	data->clkevt.mult = div_sc(pit_rate, NSEC_PER_SEC, data->clkevt.shift);
-	data->clkevt.rating = 100;
-	data->clkevt.cpumask = cpumask_of(0);
-
-	data->clkevt.set_mode = pit_clkevt_mode;
-	data->clkevt.resume = at91sam926x_pit_resume;
-	data->clkevt.suspend = at91sam926x_pit_suspend;
-	clockevents_register_device(&data->clkevt);
-}
-
-static void __init at91sam926x_pit_dt_init(struct device_node *node)
-{
-	struct pit_data *data;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		panic(pr_fmt("Unable to allocate memory\n"));
-
-	data->base = of_iomap(node, 0);
-	if (!data->base)
-		panic(pr_fmt("Could not map PIT address\n"));
-
-	data->mck = of_clk_get(node, 0);
-	if (IS_ERR(data->mck))
-		/* Fallback on clkdev for !CCF-based boards */
-		data->mck = clk_get(NULL, "mck");
-
-	if (IS_ERR(data->mck))
-		panic(pr_fmt("Unable to get mck clk\n"));
-
-	/* Get the interrupts property */
-	data->irq = irq_of_parse_and_map(node, 0);
-	if (!data->irq)
-		panic(pr_fmt("Unable to get IRQ from DT\n"));
-
-	at91sam926x_pit_common_init(data);
-}
-CLOCKSOURCE_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit",
-		       at91sam926x_pit_dt_init);
-
-static void __iomem *pit_base_addr;
-
-void __init at91sam926x_pit_init(int irq)
-{
-	struct pit_data *data;
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		panic(pr_fmt("Unable to allocate memory\n"));
-
-	data->base = pit_base_addr;
-
-	data->mck = clk_get(NULL, "mck");
-	if (IS_ERR(data->mck))
-		panic(pr_fmt("Unable to get mck clk\n"));
-
-	data->irq = irq;
-
-	at91sam926x_pit_common_init(data);
-}
-
-void __init at91sam926x_ioremap_pit(u32 addr)
-{
-	if (of_have_populated_dt())
-		return;
-
-	pit_base_addr = ioremap(addr, 16);
-
-	if (!pit_base_addr)
-		panic(pr_fmt("Impossible to ioremap PIT\n"));
-}