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Diffstat (limited to 'arch/arm/mach-mxs/timer.c')
-rw-r--r-- | arch/arm/mach-mxs/timer.c | 306 |
1 files changed, 0 insertions, 306 deletions
diff --git a/arch/arm/mach-mxs/timer.c b/arch/arm/mach-mxs/timer.c deleted file mode 100644 index 4210204..0000000 --- a/arch/arm/mach-mxs/timer.c +++ /dev/null @@ -1,306 +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_irq.h> - -#include <asm/mach/time.h> -#include <asm/sched_clock.h> -#include <mach/mxs.h> -#include <mach/common.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 = MXS_IO_ADDRESS(MXS_TIMROT_BASE_ADDR); -static u32 timrot_major_version; - -static inline void timrot_irq_disable(void) -{ - __mxs_clrl(BM_TIMROT_TIMCTRLn_IRQ_EN, - mxs_timrot_base + HW_TIMROT_TIMCTRLn(0)); -} - -static inline void timrot_irq_enable(void) -{ - __mxs_setl(BM_TIMROT_TIMCTRLn_IRQ_EN, - mxs_timrot_base + HW_TIMROT_TIMCTRLn(0)); -} - -static void timrot_irq_acknowledge(void) -{ - __mxs_clrl(BM_TIMROT_TIMCTRLn_IRQ, - mxs_timrot_base + HW_TIMROT_TIMCTRLn(0)); -} - -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; -} - -void __init mxs_timer_init(void) -{ - struct device_node *np; - struct clk *timer_clk; - int irq; - - np = of_find_compatible_node(NULL, NULL, "fsl,timrot"); - if (!np) { - pr_err("%s: failed find timrot node\n", __func__); - return; - } - - timer_clk = clk_get_sys("timrot", NULL); - 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 - */ - mxs_reset_block(mxs_timrot_base + HW_TIMROT_ROTCTRL); - - /* get timrot version */ - timrot_major_version = __raw_readl(mxs_timrot_base + - (cpu_is_mx23() ? 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); -} |