select MULTI_IRQ_HANDLER
select SPARSE_IRQ
-config AT91_SAM9_TIME
- select CLKSRC_OF if OF
- bool
-
config HAVE_AT91_SMD
bool
config SOC_AT91SAM9
bool
- select AT91_SAM9_TIME
select ATMEL_AIC_IRQ if !OLD_IRQ_AT91
select CPU_ARM926T
select GENERIC_CLOCKEVENTS
config SOC_SAMA5
bool
- select AT91_SAM9_TIME
select ATMEL_AIC5_IRQ
select CPU_V7
select GENERIC_CLOCKEVENTS
obj-$(CONFIG_OLD_IRQ_AT91) += irq.o
obj-$(CONFIG_OLD_CLK_AT91) += clock.o
-obj-$(CONFIG_AT91_SAM9_TIME) += at91sam926x_time.o
obj-$(CONFIG_SOC_AT91SAM9) += sam9_smc.o
# CPU-specific support
+++ /dev/null
-/*
- * 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"));
-}
help
Use ARM global timer clock source as sched_clock
+config ATMEL_PIT
+ select CLKSRC_OF if OF
+ def_bool SOC_AT91SAM9 || SOC_SAMA5
+
config CLKSRC_METAG_GENERIC
def_bool y if METAG
help
obj-$(CONFIG_CLKSRC_OF) += clksrc-of.o
+obj-$(CONFIG_ATMEL_PIT) += timer-atmel-pit.o
obj-$(CONFIG_ATMEL_TCB_CLKSRC) += tcb_clksrc.o
obj-$(CONFIG_X86_PM_TIMER) += acpi_pm.o
obj-$(CONFIG_SCx200HR_TIMER) += scx200_hrt.o
--- /dev/null
+/*
+ * 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"));
+}
projects / mirror_ubuntu-jammy-kernel.git / commitdiff