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-rw-r--r--drivers/clocksource/Kconfig7
-rw-r--r--drivers/clocksource/Makefile1
-rw-r--r--drivers/clocksource/moxart_timer.c256
-rw-r--r--drivers/clocksource/timer-fttmr010.c143
4 files changed, 106 insertions, 301 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 545d541ae20e..1b22ade4c8f1 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -188,13 +188,6 @@ config ATLAS7_TIMER
help
Enables support for the Atlas7 timer.
-config MOXART_TIMER
- bool "Moxart timer driver" if COMPILE_TEST
- depends on GENERIC_CLOCKEVENTS
- select CLKSRC_MMIO
- help
- Enables support for the Moxart timer.
-
config MXS_TIMER
bool "Mxs timer driver" if COMPILE_TEST
depends on GENERIC_CLOCKEVENTS
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 2b5b56a6f00f..cf0c30b6ec1f 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -26,7 +26,6 @@ obj-$(CONFIG_ORION_TIMER) += time-orion.o
obj-$(CONFIG_BCM2835_TIMER) += bcm2835_timer.o
obj-$(CONFIG_CLPS711X_TIMER) += clps711x-timer.o
obj-$(CONFIG_ATLAS7_TIMER) += timer-atlas7.o
-obj-$(CONFIG_MOXART_TIMER) += moxart_timer.o
obj-$(CONFIG_MXS_TIMER) += mxs_timer.o
obj-$(CONFIG_CLKSRC_PXA) += pxa_timer.o
obj-$(CONFIG_PRIMA2_TIMER) += timer-prima2.o
diff --git a/drivers/clocksource/moxart_timer.c b/drivers/clocksource/moxart_timer.c
deleted file mode 100644
index 7f3430654fbd..000000000000
--- a/drivers/clocksource/moxart_timer.c
+++ /dev/null
@@ -1,256 +0,0 @@
-/*
- * MOXA ART SoCs timer handling.
- *
- * Copyright (C) 2013 Jonas Jensen
- *
- * Jonas Jensen <jonas.jensen@gmail.com>
- *
- * 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/clk.h>
-#include <linux/clockchips.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/irqreturn.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/clocksource.h>
-#include <linux/bitops.h>
-#include <linux/slab.h>
-
-#define TIMER1_BASE 0x00
-#define TIMER2_BASE 0x10
-#define TIMER3_BASE 0x20
-
-#define REG_COUNT 0x0 /* writable */
-#define REG_LOAD 0x4
-#define REG_MATCH1 0x8
-#define REG_MATCH2 0xC
-
-#define TIMER_CR 0x30
-#define TIMER_INTR_STATE 0x34
-#define TIMER_INTR_MASK 0x38
-
-/*
- * Moxart TIMER_CR flags:
- *
- * MOXART_CR_*_CLOCK 0: PCLK, 1: EXT1CLK
- * MOXART_CR_*_INT overflow interrupt enable bit
- */
-#define MOXART_CR_1_ENABLE BIT(0)
-#define MOXART_CR_1_CLOCK BIT(1)
-#define MOXART_CR_1_INT BIT(2)
-#define MOXART_CR_2_ENABLE BIT(3)
-#define MOXART_CR_2_CLOCK BIT(4)
-#define MOXART_CR_2_INT BIT(5)
-#define MOXART_CR_3_ENABLE BIT(6)
-#define MOXART_CR_3_CLOCK BIT(7)
-#define MOXART_CR_3_INT BIT(8)
-#define MOXART_CR_COUNT_UP BIT(9)
-
-#define MOXART_TIMER1_ENABLE (MOXART_CR_2_ENABLE | MOXART_CR_1_ENABLE)
-#define MOXART_TIMER1_DISABLE (MOXART_CR_2_ENABLE)
-
-/*
- * The ASpeed variant of the IP block has a different layout
- * for the control register
- */
-#define ASPEED_CR_1_ENABLE BIT(0)
-#define ASPEED_CR_1_CLOCK BIT(1)
-#define ASPEED_CR_1_INT BIT(2)
-#define ASPEED_CR_2_ENABLE BIT(4)
-#define ASPEED_CR_2_CLOCK BIT(5)
-#define ASPEED_CR_2_INT BIT(6)
-#define ASPEED_CR_3_ENABLE BIT(8)
-#define ASPEED_CR_3_CLOCK BIT(9)
-#define ASPEED_CR_3_INT BIT(10)
-
-#define ASPEED_TIMER1_ENABLE (ASPEED_CR_2_ENABLE | ASPEED_CR_1_ENABLE)
-#define ASPEED_TIMER1_DISABLE (ASPEED_CR_2_ENABLE)
-
-struct moxart_timer {
- void __iomem *base;
- unsigned int t1_disable_val;
- unsigned int t1_enable_val;
- unsigned int count_per_tick;
- struct clock_event_device clkevt;
-};
-
-static inline struct moxart_timer *to_moxart(struct clock_event_device *evt)
-{
- return container_of(evt, struct moxart_timer, clkevt);
-}
-
-static inline void moxart_disable(struct clock_event_device *evt)
-{
- struct moxart_timer *timer = to_moxart(evt);
-
- writel(timer->t1_disable_val, timer->base + TIMER_CR);
-}
-
-static inline void moxart_enable(struct clock_event_device *evt)
-{
- struct moxart_timer *timer = to_moxart(evt);
-
- writel(timer->t1_enable_val, timer->base + TIMER_CR);
-}
-
-static int moxart_shutdown(struct clock_event_device *evt)
-{
- moxart_disable(evt);
- return 0;
-}
-
-static int moxart_set_oneshot(struct clock_event_device *evt)
-{
- moxart_disable(evt);
- writel(~0, to_moxart(evt)->base + TIMER1_BASE + REG_LOAD);
- return 0;
-}
-
-static int moxart_set_periodic(struct clock_event_device *evt)
-{
- struct moxart_timer *timer = to_moxart(evt);
-
- moxart_disable(evt);
- writel(timer->count_per_tick, timer->base + TIMER1_BASE + REG_LOAD);
- writel(0, timer->base + TIMER1_BASE + REG_MATCH1);
- moxart_enable(evt);
- return 0;
-}
-
-static int moxart_clkevt_next_event(unsigned long cycles,
- struct clock_event_device *evt)
-{
- struct moxart_timer *timer = to_moxart(evt);
- u32 u;
-
- moxart_disable(evt);
-
- u = readl(timer->base + TIMER1_BASE + REG_COUNT) - cycles;
- writel(u, timer->base + TIMER1_BASE + REG_MATCH1);
-
- moxart_enable(evt);
-
- return 0;
-}
-
-static irqreturn_t moxart_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evt = dev_id;
- evt->event_handler(evt);
- return IRQ_HANDLED;
-}
-
-static int __init moxart_timer_init(struct device_node *node)
-{
- int ret, irq;
- unsigned long pclk;
- struct clk *clk;
- struct moxart_timer *timer;
-
- timer = kzalloc(sizeof(*timer), GFP_KERNEL);
- if (!timer)
- return -ENOMEM;
-
- timer->base = of_iomap(node, 0);
- if (!timer->base) {
- pr_err("%s: of_iomap failed\n", node->full_name);
- ret = -ENXIO;
- goto out_free;
- }
-
- irq = irq_of_parse_and_map(node, 0);
- if (irq <= 0) {
- pr_err("%s: irq_of_parse_and_map failed\n", node->full_name);
- ret = -EINVAL;
- goto out_unmap;
- }
-
- clk = of_clk_get(node, 0);
- if (IS_ERR(clk)) {
- pr_err("%s: of_clk_get failed\n", node->full_name);
- ret = PTR_ERR(clk);
- goto out_unmap;
- }
-
- pclk = clk_get_rate(clk);
-
- if (of_device_is_compatible(node, "moxa,moxart-timer")) {
- timer->t1_enable_val = MOXART_TIMER1_ENABLE;
- timer->t1_disable_val = MOXART_TIMER1_DISABLE;
- } else if (of_device_is_compatible(node, "aspeed,ast2400-timer")) {
- timer->t1_enable_val = ASPEED_TIMER1_ENABLE;
- timer->t1_disable_val = ASPEED_TIMER1_DISABLE;
- } else {
- pr_err("%s: unknown platform\n", node->full_name);
- ret = -EINVAL;
- goto out_unmap;
- }
-
- timer->count_per_tick = DIV_ROUND_CLOSEST(pclk, HZ);
-
- timer->clkevt.name = node->name;
- timer->clkevt.rating = 200;
- timer->clkevt.features = CLOCK_EVT_FEAT_PERIODIC |
- CLOCK_EVT_FEAT_ONESHOT;
- timer->clkevt.set_state_shutdown = moxart_shutdown;
- timer->clkevt.set_state_periodic = moxart_set_periodic;
- timer->clkevt.set_state_oneshot = moxart_set_oneshot;
- timer->clkevt.tick_resume = moxart_set_oneshot;
- timer->clkevt.set_next_event = moxart_clkevt_next_event;
- timer->clkevt.cpumask = cpumask_of(0);
- timer->clkevt.irq = irq;
-
- ret = clocksource_mmio_init(timer->base + TIMER2_BASE + REG_COUNT,
- "moxart_timer", pclk, 200, 32,
- clocksource_mmio_readl_down);
- if (ret) {
- pr_err("%s: clocksource_mmio_init failed\n", node->full_name);
- goto out_unmap;
- }
-
- ret = request_irq(irq, moxart_timer_interrupt, IRQF_TIMER,
- node->name, &timer->clkevt);
- if (ret) {
- pr_err("%s: setup_irq failed\n", node->full_name);
- goto out_unmap;
- }
-
- /* Clear match registers */
- writel(0, timer->base + TIMER1_BASE + REG_MATCH1);
- writel(0, timer->base + TIMER1_BASE + REG_MATCH2);
- writel(0, timer->base + TIMER2_BASE + REG_MATCH1);
- writel(0, timer->base + TIMER2_BASE + REG_MATCH2);
-
- /*
- * Start timer 2 rolling as our main wall clock source, keep timer 1
- * disabled
- */
- writel(0, timer->base + TIMER_CR);
- writel(~0, timer->base + TIMER2_BASE + REG_LOAD);
- writel(timer->t1_disable_val, timer->base + TIMER_CR);
-
- /*
- * documentation is not publicly available:
- * min_delta / max_delta obtained by trial-and-error,
- * max_delta 0xfffffffe should be ok because count
- * register size is u32
- */
- clockevents_config_and_register(&timer->clkevt, pclk, 0x4, 0xfffffffe);
-
- return 0;
-
-out_unmap:
- iounmap(timer->base);
-out_free:
- kfree(timer);
- return ret;
-}
-CLOCKSOURCE_OF_DECLARE(moxart, "moxa,moxart-timer", moxart_timer_init);
-CLOCKSOURCE_OF_DECLARE(aspeed, "aspeed,ast2400-timer", moxart_timer_init);
diff --git a/drivers/clocksource/timer-fttmr010.c b/drivers/clocksource/timer-fttmr010.c
index 2d915d1455ab..f8801507a687 100644
--- a/drivers/clocksource/timer-fttmr010.c
+++ b/drivers/clocksource/timer-fttmr010.c
@@ -50,6 +50,20 @@
#define TIMER_2_CR_UPDOWN BIT(10)
#define TIMER_3_CR_UPDOWN BIT(11)
+/*
+ * The Aspeed AST2400 moves bits around in the control register
+ * and lacks bits for setting the timer to count upwards.
+ */
+#define TIMER_1_CR_ASPEED_ENABLE BIT(0)
+#define TIMER_1_CR_ASPEED_CLOCK BIT(1)
+#define TIMER_1_CR_ASPEED_INT BIT(2)
+#define TIMER_2_CR_ASPEED_ENABLE BIT(4)
+#define TIMER_2_CR_ASPEED_CLOCK BIT(5)
+#define TIMER_2_CR_ASPEED_INT BIT(6)
+#define TIMER_3_CR_ASPEED_ENABLE BIT(8)
+#define TIMER_3_CR_ASPEED_CLOCK BIT(9)
+#define TIMER_3_CR_ASPEED_INT BIT(10)
+
#define TIMER_1_INT_MATCH1 BIT(0)
#define TIMER_1_INT_MATCH2 BIT(1)
#define TIMER_1_INT_OVERFLOW BIT(2)
@@ -64,6 +78,8 @@
struct fttmr010 {
void __iomem *base;
unsigned int tick_rate;
+ bool count_down;
+ u32 t1_enable_val;
struct clock_event_device clkevt;
};
@@ -77,6 +93,8 @@ static inline struct fttmr010 *to_fttmr010(struct clock_event_device *evt)
static u64 notrace fttmr010_read_sched_clock(void)
{
+ if (local_fttmr->count_down)
+ return ~readl(local_fttmr->base + TIMER2_COUNT);
return readl(local_fttmr->base + TIMER2_COUNT);
}
@@ -86,11 +104,23 @@ static int fttmr010_timer_set_next_event(unsigned long cycles,
struct fttmr010 *fttmr010 = to_fttmr010(evt);
u32 cr;
- /* Setup the match register */
+ /* Stop */
+ cr = readl(fttmr010->base + TIMER_CR);
+ cr &= ~fttmr010->t1_enable_val;
+ writel(cr, fttmr010->base + TIMER_CR);
+
+ /* Setup the match register forward/backward in time */
cr = readl(fttmr010->base + TIMER1_COUNT);
- writel(cr + cycles, fttmr010->base + TIMER1_MATCH1);
- if (readl(fttmr010->base + TIMER1_COUNT) - cr > cycles)
- return -ETIME;
+ if (fttmr010->count_down)
+ cr -= cycles;
+ else
+ cr += cycles;
+ writel(cr, fttmr010->base + TIMER1_MATCH1);
+
+ /* Start */
+ cr = readl(fttmr010->base + TIMER_CR);
+ cr |= fttmr010->t1_enable_val;
+ writel(cr, fttmr010->base + TIMER_CR);
return 0;
}
@@ -100,9 +130,9 @@ static int fttmr010_timer_shutdown(struct clock_event_device *evt)
struct fttmr010 *fttmr010 = to_fttmr010(evt);
u32 cr;
- /* Stop timer and interrupt. */
+ /* Stop */
cr = readl(fttmr010->base + TIMER_CR);
- cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT);
+ cr &= ~fttmr010->t1_enable_val;
writel(cr, fttmr010->base + TIMER_CR);
return 0;
@@ -113,14 +143,17 @@ static int fttmr010_timer_set_oneshot(struct clock_event_device *evt)
struct fttmr010 *fttmr010 = to_fttmr010(evt);
u32 cr;
- /* Stop timer and interrupt. */
+ /* Stop */
cr = readl(fttmr010->base + TIMER_CR);
- cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT);
+ cr &= ~fttmr010->t1_enable_val;
writel(cr, fttmr010->base + TIMER_CR);
- /* Setup counter start from 0 */
+ /* Setup counter start from 0 or ~0 */
writel(0, fttmr010->base + TIMER1_COUNT);
- writel(0, fttmr010->base + TIMER1_LOAD);
+ if (fttmr010->count_down)
+ writel(~0, fttmr010->base + TIMER1_LOAD);
+ else
+ writel(0, fttmr010->base + TIMER1_LOAD);
/* Enable interrupt */
cr = readl(fttmr010->base + TIMER_INTR_MASK);
@@ -128,11 +161,6 @@ static int fttmr010_timer_set_oneshot(struct clock_event_device *evt)
cr |= TIMER_1_INT_MATCH1;
writel(cr, fttmr010->base + TIMER_INTR_MASK);
- /* Start the timer */
- cr = readl(fttmr010->base + TIMER_CR);
- cr |= TIMER_1_CR_ENABLE;
- writel(cr, fttmr010->base + TIMER_CR);
-
return 0;
}
@@ -142,26 +170,30 @@ static int fttmr010_timer_set_periodic(struct clock_event_device *evt)
u32 period = DIV_ROUND_CLOSEST(fttmr010->tick_rate, HZ);
u32 cr;
- /* Stop timer and interrupt */
+ /* Stop */
cr = readl(fttmr010->base + TIMER_CR);
- cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT);
+ cr &= ~fttmr010->t1_enable_val;
writel(cr, fttmr010->base + TIMER_CR);
- /* Setup timer to fire at 1/HT intervals. */
- cr = 0xffffffff - (period - 1);
- writel(cr, fttmr010->base + TIMER1_COUNT);
- writel(cr, fttmr010->base + TIMER1_LOAD);
-
- /* enable interrupt on overflow */
- cr = readl(fttmr010->base + TIMER_INTR_MASK);
- cr &= ~(TIMER_1_INT_MATCH1 | TIMER_1_INT_MATCH2);
- cr |= TIMER_1_INT_OVERFLOW;
- writel(cr, fttmr010->base + TIMER_INTR_MASK);
+ /* Setup timer to fire at 1/HZ intervals. */
+ if (fttmr010->count_down) {
+ writel(period, fttmr010->base + TIMER1_LOAD);
+ writel(0, fttmr010->base + TIMER1_MATCH1);
+ } else {
+ cr = 0xffffffff - (period - 1);
+ writel(cr, fttmr010->base + TIMER1_COUNT);
+ writel(cr, fttmr010->base + TIMER1_LOAD);
+
+ /* Enable interrupt on overflow */
+ cr = readl(fttmr010->base + TIMER_INTR_MASK);
+ cr &= ~(TIMER_1_INT_MATCH1 | TIMER_1_INT_MATCH2);
+ cr |= TIMER_1_INT_OVERFLOW;
+ writel(cr, fttmr010->base + TIMER_INTR_MASK);
+ }
/* Start the timer */
cr = readl(fttmr010->base + TIMER_CR);
- cr |= TIMER_1_CR_ENABLE;
- cr |= TIMER_1_CR_INT;
+ cr |= fttmr010->t1_enable_val;
writel(cr, fttmr010->base + TIMER_CR);
return 0;
@@ -181,9 +213,11 @@ static irqreturn_t fttmr010_timer_interrupt(int irq, void *dev_id)
static int __init fttmr010_timer_init(struct device_node *np)
{
struct fttmr010 *fttmr010;
+ bool is_ast2400;
int irq;
struct clk *clk;
int ret;
+ u32 val;
/*
* These implementations require a clock reference.
@@ -223,13 +257,37 @@ static int __init fttmr010_timer_init(struct device_node *np)
}
/*
+ * The Aspeed AST2400 moves bits around in the control register,
+ * otherwise it works the same.
+ */
+ is_ast2400 = of_device_is_compatible(np, "aspeed,ast2400-timer");
+ if (is_ast2400) {
+ fttmr010->t1_enable_val = TIMER_1_CR_ASPEED_ENABLE |
+ TIMER_1_CR_ASPEED_INT;
+ /* Downward not available */
+ fttmr010->count_down = true;
+ } else {
+ fttmr010->t1_enable_val = TIMER_1_CR_ENABLE | TIMER_1_CR_INT;
+ }
+
+ /*
* Reset the interrupt mask and status
*/
writel(TIMER_INT_ALL_MASK, fttmr010->base + TIMER_INTR_MASK);
writel(0, fttmr010->base + TIMER_INTR_STATE);
- /* Enable timer 1 count up, timer 2 count up */
- writel((TIMER_1_CR_UPDOWN | TIMER_2_CR_ENABLE | TIMER_2_CR_UPDOWN),
- fttmr010->base + TIMER_CR);
+
+ /*
+ * Enable timer 1 count up, timer 2 count up, except on Aspeed,
+ * where everything just counts down.
+ */
+ if (is_ast2400)
+ val = TIMER_2_CR_ASPEED_ENABLE;
+ else {
+ val = TIMER_2_CR_ENABLE;
+ if (!fttmr010->count_down)
+ val |= TIMER_1_CR_UPDOWN | TIMER_2_CR_UPDOWN;
+ }
+ writel(val, fttmr010->base + TIMER_CR);
/*
* Setup free-running clocksource timer (interrupts
@@ -237,13 +295,22 @@ static int __init fttmr010_timer_init(struct device_node *np)
*/
local_fttmr = fttmr010;
writel(0, fttmr010->base + TIMER2_COUNT);
- writel(0, fttmr010->base + TIMER2_LOAD);
writel(0, fttmr010->base + TIMER2_MATCH1);
writel(0, fttmr010->base + TIMER2_MATCH2);
- clocksource_mmio_init(fttmr010->base + TIMER2_COUNT,
- "FTTMR010-TIMER2",
- fttmr010->tick_rate,
- 300, 32, clocksource_mmio_readl_up);
+
+ if (fttmr010->count_down) {
+ writel(~0, fttmr010->base + TIMER2_LOAD);
+ clocksource_mmio_init(fttmr010->base + TIMER2_COUNT,
+ "FTTMR010-TIMER2",
+ fttmr010->tick_rate,
+ 300, 32, clocksource_mmio_readl_down);
+ } else {
+ writel(0, fttmr010->base + TIMER2_LOAD);
+ clocksource_mmio_init(fttmr010->base + TIMER2_COUNT,
+ "FTTMR010-TIMER2",
+ fttmr010->tick_rate,
+ 300, 32, clocksource_mmio_readl_up);
+ }
sched_clock_register(fttmr010_read_sched_clock, 32,
fttmr010->tick_rate);
@@ -290,3 +357,5 @@ out_disable_clock:
}
CLOCKSOURCE_OF_DECLARE(fttmr010, "faraday,fttmr010", fttmr010_timer_init);
CLOCKSOURCE_OF_DECLARE(gemini, "cortina,gemini-timer", fttmr010_timer_init);
+CLOCKSOURCE_OF_DECLARE(moxart, "moxa,moxart-timer", fttmr010_timer_init);
+CLOCKSOURCE_OF_DECLARE(aspeed, "aspeed,ast2400-timer", fttmr010_timer_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 13:22:56 +0100