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authorShawn Guo <shawn.guo@linaro.org>2013-03-25 20:16:52 +0800
committerShawn Guo <shawn.guo@linaro.org>2013-04-01 16:30:03 +0800
commitc74512bf83f3568baf566265c5bd3b8a96ede353 (patch)
tree2ed66625b1c64f011428a753b8edfa180d3d2d0d /arch/arm/mach-mxs
parent7a9c39f7872afca493ccee05bd6754557cb0c586 (diff)
downloadlinux-linaro-stable-c74512bf83f3568baf566265c5bd3b8a96ede353.tar.gz
ARM: mxs: move timer driver into drivers/clocksource
Move mxs timer driver into drivers/clocksource as mxs_timer.c. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm/mach-mxs')
-rw-r--r--arch/arm/mach-mxs/Makefile2
-rw-r--r--arch/arm/mach-mxs/timer.c304
2 files changed, 1 insertions, 305 deletions
diff --git a/arch/arm/mach-mxs/Makefile b/arch/arm/mach-mxs/Makefile
index 3d3c8a973062..76c336e6f5b5 100644
--- a/arch/arm/mach-mxs/Makefile
+++ b/arch/arm/mach-mxs/Makefile
@@ -1,5 +1,5 @@
# Common support
-obj-y := icoll.o ocotp.o system.o timer.o mm.o
+obj-y := icoll.o ocotp.o system.o mm.o
obj-$(CONFIG_PM) += pm.o
diff --git a/arch/arm/mach-mxs/timer.c b/arch/arm/mach-mxs/timer.c
deleted file mode 100644
index a4d469b21d96..000000000000
--- a/arch/arm/mach-mxs/timer.c
+++ /dev/null
@@ -1,304 +0,0 @@
-/*
- * Copyright (C) 2000-2001 Deep Blue Solutions
- * Copyright (C) 2002 Shane Nay (shane@minirl.com)
- * Copyright (C) 2006-2007 Pavel Pisa (ppisa@pikron.com)
- * Copyright (C) 2008 Juergen Beisert (kernel@pengutronix.de)
- * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301, USA.
- */
-
-#include <linux/err.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/clockchips.h>
-#include <linux/clk.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/stmp_device.h>
-
-#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
-
-/*
- * There are 2 versions of the timrot on Freescale MXS-based SoCs.
- * The v1 on MX23 only gets 16 bits counter, while v2 on MX28
- * extends the counter to 32 bits.
- *
- * The implementation uses two timers, one for clock_event and
- * another for clocksource. MX28 uses timrot 0 and 1, while MX23
- * uses 0 and 2.
- */
-
-#define MX23_TIMROT_VERSION_OFFSET 0x0a0
-#define MX28_TIMROT_VERSION_OFFSET 0x120
-#define BP_TIMROT_MAJOR_VERSION 24
-#define BV_TIMROT_VERSION_1 0x01
-#define BV_TIMROT_VERSION_2 0x02
-#define timrot_is_v1() (timrot_major_version == BV_TIMROT_VERSION_1)
-
-/*
- * There are 4 registers for each timrotv2 instance, and 2 registers
- * for each timrotv1. So address step 0x40 in macros below strides
- * one instance of timrotv2 while two instances of timrotv1.
- *
- * As the result, HW_TIMROT_XXXn(1) defines the address of timrot1
- * on MX28 while timrot2 on MX23.
- */
-/* common between v1 and v2 */
-#define HW_TIMROT_ROTCTRL 0x00
-#define HW_TIMROT_TIMCTRLn(n) (0x20 + (n) * 0x40)
-/* v1 only */
-#define HW_TIMROT_TIMCOUNTn(n) (0x30 + (n) * 0x40)
-/* v2 only */
-#define HW_TIMROT_RUNNING_COUNTn(n) (0x30 + (n) * 0x40)
-#define HW_TIMROT_FIXED_COUNTn(n) (0x40 + (n) * 0x40)
-
-#define BM_TIMROT_TIMCTRLn_RELOAD (1 << 6)
-#define BM_TIMROT_TIMCTRLn_UPDATE (1 << 7)
-#define BM_TIMROT_TIMCTRLn_IRQ_EN (1 << 14)
-#define BM_TIMROT_TIMCTRLn_IRQ (1 << 15)
-#define BP_TIMROT_TIMCTRLn_SELECT 0
-#define BV_TIMROTv1_TIMCTRLn_SELECT__32KHZ_XTAL 0x8
-#define BV_TIMROTv2_TIMCTRLn_SELECT__32KHZ_XTAL 0xb
-#define BV_TIMROTv2_TIMCTRLn_SELECT__TICK_ALWAYS 0xf
-
-static struct clock_event_device mxs_clockevent_device;
-static enum clock_event_mode mxs_clockevent_mode = CLOCK_EVT_MODE_UNUSED;
-
-static void __iomem *mxs_timrot_base;
-static u32 timrot_major_version;
-
-static inline void timrot_irq_disable(void)
-{
- __raw_writel(BM_TIMROT_TIMCTRLn_IRQ_EN, mxs_timrot_base +
- HW_TIMROT_TIMCTRLn(0) + STMP_OFFSET_REG_CLR);
-}
-
-static inline void timrot_irq_enable(void)
-{
- __raw_writel(BM_TIMROT_TIMCTRLn_IRQ_EN, mxs_timrot_base +
- HW_TIMROT_TIMCTRLn(0) + STMP_OFFSET_REG_SET);
-}
-
-static void timrot_irq_acknowledge(void)
-{
- __raw_writel(BM_TIMROT_TIMCTRLn_IRQ, mxs_timrot_base +
- HW_TIMROT_TIMCTRLn(0) + STMP_OFFSET_REG_CLR);
-}
-
-static cycle_t timrotv1_get_cycles(struct clocksource *cs)
-{
- return ~((__raw_readl(mxs_timrot_base + HW_TIMROT_TIMCOUNTn(1))
- & 0xffff0000) >> 16);
-}
-
-static int timrotv1_set_next_event(unsigned long evt,
- struct clock_event_device *dev)
-{
- /* timrot decrements the count */
- __raw_writel(evt, mxs_timrot_base + HW_TIMROT_TIMCOUNTn(0));
-
- return 0;
-}
-
-static int timrotv2_set_next_event(unsigned long evt,
- struct clock_event_device *dev)
-{
- /* timrot decrements the count */
- __raw_writel(evt, mxs_timrot_base + HW_TIMROT_FIXED_COUNTn(0));
-
- return 0;
-}
-
-static irqreturn_t mxs_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evt = dev_id;
-
- timrot_irq_acknowledge();
- evt->event_handler(evt);
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction mxs_timer_irq = {
- .name = "MXS Timer Tick",
- .dev_id = &mxs_clockevent_device,
- .flags = IRQF_TIMER | IRQF_IRQPOLL,
- .handler = mxs_timer_interrupt,
-};
-
-#ifdef DEBUG
-static const char *clock_event_mode_label[] const = {
- [CLOCK_EVT_MODE_PERIODIC] = "CLOCK_EVT_MODE_PERIODIC",
- [CLOCK_EVT_MODE_ONESHOT] = "CLOCK_EVT_MODE_ONESHOT",
- [CLOCK_EVT_MODE_SHUTDOWN] = "CLOCK_EVT_MODE_SHUTDOWN",
- [CLOCK_EVT_MODE_UNUSED] = "CLOCK_EVT_MODE_UNUSED"
-};
-#endif /* DEBUG */
-
-static void mxs_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt)
-{
- /* Disable interrupt in timer module */
- timrot_irq_disable();
-
- if (mode != mxs_clockevent_mode) {
- /* Set event time into the furthest future */
- if (timrot_is_v1())
- __raw_writel(0xffff,
- mxs_timrot_base + HW_TIMROT_TIMCOUNTn(1));
- else
- __raw_writel(0xffffffff,
- mxs_timrot_base + HW_TIMROT_FIXED_COUNTn(1));
-
- /* Clear pending interrupt */
- timrot_irq_acknowledge();
- }
-
-#ifdef DEBUG
- pr_info("%s: changing mode from %s to %s\n", __func__,
- clock_event_mode_label[mxs_clockevent_mode],
- clock_event_mode_label[mode]);
-#endif /* DEBUG */
-
- /* Remember timer mode */
- mxs_clockevent_mode = mode;
-
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- pr_err("%s: Periodic mode is not implemented\n", __func__);
- break;
- case CLOCK_EVT_MODE_ONESHOT:
- timrot_irq_enable();
- break;
- case CLOCK_EVT_MODE_SHUTDOWN:
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_RESUME:
- /* Left event sources disabled, no more interrupts appear */
- break;
- }
-}
-
-static struct clock_event_device mxs_clockevent_device = {
- .name = "mxs_timrot",
- .features = CLOCK_EVT_FEAT_ONESHOT,
- .set_mode = mxs_set_mode,
- .set_next_event = timrotv2_set_next_event,
- .rating = 200,
-};
-
-static int __init mxs_clockevent_init(struct clk *timer_clk)
-{
- if (timrot_is_v1())
- mxs_clockevent_device.set_next_event = timrotv1_set_next_event;
- mxs_clockevent_device.cpumask = cpumask_of(0);
- clockevents_config_and_register(&mxs_clockevent_device,
- clk_get_rate(timer_clk),
- timrot_is_v1() ? 0xf : 0x2,
- timrot_is_v1() ? 0xfffe : 0xfffffffe);
-
- return 0;
-}
-
-static struct clocksource clocksource_mxs = {
- .name = "mxs_timer",
- .rating = 200,
- .read = timrotv1_get_cycles,
- .mask = CLOCKSOURCE_MASK(16),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-static u32 notrace mxs_read_sched_clock_v2(void)
-{
- return ~readl_relaxed(mxs_timrot_base + HW_TIMROT_RUNNING_COUNTn(1));
-}
-
-static int __init mxs_clocksource_init(struct clk *timer_clk)
-{
- unsigned int c = clk_get_rate(timer_clk);
-
- if (timrot_is_v1())
- clocksource_register_hz(&clocksource_mxs, c);
- else {
- clocksource_mmio_init(mxs_timrot_base + HW_TIMROT_RUNNING_COUNTn(1),
- "mxs_timer", c, 200, 32, clocksource_mmio_readl_down);
- setup_sched_clock(mxs_read_sched_clock_v2, 32, c);
- }
-
- return 0;
-}
-
-static void __init mxs_timer_init(struct device_node *np)
-{
- struct clk *timer_clk;
- int irq;
-
- mxs_timrot_base = of_iomap(np, 0);
- WARN_ON(!mxs_timrot_base);
-
- timer_clk = of_clk_get(np, 0);
- if (IS_ERR(timer_clk)) {
- pr_err("%s: failed to get clk\n", __func__);
- return;
- }
-
- clk_prepare_enable(timer_clk);
-
- /*
- * Initialize timers to a known state
- */
- stmp_reset_block(mxs_timrot_base + HW_TIMROT_ROTCTRL);
-
- /* get timrot version */
- timrot_major_version = __raw_readl(mxs_timrot_base +
- (of_device_is_compatible(np, "fsl,imx23-timrot") ?
- MX23_TIMROT_VERSION_OFFSET :
- MX28_TIMROT_VERSION_OFFSET));
- timrot_major_version >>= BP_TIMROT_MAJOR_VERSION;
-
- /* one for clock_event */
- __raw_writel((timrot_is_v1() ?
- BV_TIMROTv1_TIMCTRLn_SELECT__32KHZ_XTAL :
- BV_TIMROTv2_TIMCTRLn_SELECT__TICK_ALWAYS) |
- BM_TIMROT_TIMCTRLn_UPDATE |
- BM_TIMROT_TIMCTRLn_IRQ_EN,
- mxs_timrot_base + HW_TIMROT_TIMCTRLn(0));
-
- /* another for clocksource */
- __raw_writel((timrot_is_v1() ?
- BV_TIMROTv1_TIMCTRLn_SELECT__32KHZ_XTAL :
- BV_TIMROTv2_TIMCTRLn_SELECT__TICK_ALWAYS) |
- BM_TIMROT_TIMCTRLn_RELOAD,
- mxs_timrot_base + HW_TIMROT_TIMCTRLn(1));
-
- /* set clocksource timer fixed count to the maximum */
- if (timrot_is_v1())
- __raw_writel(0xffff,
- mxs_timrot_base + HW_TIMROT_TIMCOUNTn(1));
- else
- __raw_writel(0xffffffff,
- mxs_timrot_base + HW_TIMROT_FIXED_COUNTn(1));
-
- /* init and register the timer to the framework */
- mxs_clocksource_init(timer_clk);
- mxs_clockevent_init(timer_clk);
-
- /* Make irqs happen */
- irq = irq_of_parse_and_map(np, 0);
- setup_irq(irq, &mxs_timer_irq);
-}
-CLOCKSOURCE_OF_DECLARE(mxs, "fsl,timrot", mxs_timer_init)