diff options
Diffstat (limited to 'arch/arm/plat-omap/timer32k.c')
| -rw-r--r-- | arch/arm/plat-omap/timer32k.c | 269 |
1 files changed, 0 insertions, 269 deletions
diff --git a/arch/arm/plat-omap/timer32k.c b/arch/arm/plat-omap/timer32k.c deleted file mode 100644 index ea76f1979a3d..000000000000 --- a/arch/arm/plat-omap/timer32k.c +++ /dev/null @@ -1,269 +0,0 @@ -/* - * linux/arch/arm/plat-omap/timer32k.c - * - * OMAP 32K Timer - * - * Copyright (C) 2004 - 2005 Nokia Corporation - * Partial timer rewrite and additional dynamic tick timer support by - * Tony Lindgen <tony@atomide.com> and - * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com> - * OMAP Dual-mode timer framework support by Timo Teras - * - * MPU timer code based on the older MPU timer code for OMAP - * Copyright (C) 2000 RidgeRun, Inc. - * Author: Greg Lonnon <glonnon@ridgerun.com> - * - * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN - * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF - * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON - * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - * 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., - * 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/sched.h> -#include <linux/spinlock.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/clocksource.h> -#include <linux/clockchips.h> - -#include <asm/system.h> -#include <asm/hardware.h> -#include <asm/io.h> -#include <asm/leds.h> -#include <asm/irq.h> -#include <asm/mach/irq.h> -#include <asm/mach/time.h> -#include <asm/arch/dmtimer.h> - -struct sys_timer omap_timer; - -/* - * --------------------------------------------------------------------------- - * 32KHz OS timer - * - * This currently works only on 16xx, as 1510 does not have the continuous - * 32KHz synchronous timer. The 32KHz synchronous timer is used to keep track - * of time in addition to the 32KHz OS timer. Using only the 32KHz OS timer - * on 1510 would be possible, but the timer would not be as accurate as - * with the 32KHz synchronized timer. - * --------------------------------------------------------------------------- - */ - -#if defined(CONFIG_ARCH_OMAP16XX) -#define TIMER_32K_SYNCHRONIZED 0xfffbc410 -#elif defined(CONFIG_ARCH_OMAP24XX) -#define TIMER_32K_SYNCHRONIZED (OMAP24XX_32KSYNCT_BASE + 0x10) -#else -#error OMAP 32KHz timer does not currently work on 15XX! -#endif - -/* 16xx specific defines */ -#define OMAP1_32K_TIMER_BASE 0xfffb9000 -#define OMAP1_32K_TIMER_CR 0x08 -#define OMAP1_32K_TIMER_TVR 0x00 -#define OMAP1_32K_TIMER_TCR 0x04 - -#define OMAP_32K_TICKS_PER_SEC (32768) - -/* - * TRM says 1 / HZ = ( TVR + 1) / 32768, so TRV = (32768 / HZ) - 1 - * so with HZ = 128, TVR = 255. - */ -#define OMAP_32K_TIMER_TICK_PERIOD ((OMAP_32K_TICKS_PER_SEC / HZ) - 1) - -#define JIFFIES_TO_HW_TICKS(nr_jiffies, clock_rate) \ - (((nr_jiffies) * (clock_rate)) / HZ) - -#if defined(CONFIG_ARCH_OMAP1) - -static inline void omap_32k_timer_write(int val, int reg) -{ - omap_writew(val, OMAP1_32K_TIMER_BASE + reg); -} - -static inline unsigned long omap_32k_timer_read(int reg) -{ - return omap_readl(OMAP1_32K_TIMER_BASE + reg) & 0xffffff; -} - -static inline void omap_32k_timer_start(unsigned long load_val) -{ - if (!load_val) - load_val = 1; - omap_32k_timer_write(load_val, OMAP1_32K_TIMER_TVR); - omap_32k_timer_write(0x0f, OMAP1_32K_TIMER_CR); -} - -static inline void omap_32k_timer_stop(void) -{ - omap_32k_timer_write(0x0, OMAP1_32K_TIMER_CR); -} - -#define omap_32k_timer_ack_irq() - -#elif defined(CONFIG_ARCH_OMAP2) - -static struct omap_dm_timer *gptimer; - -static inline void omap_32k_timer_start(unsigned long load_val) -{ - omap_dm_timer_set_load(gptimer, 1, 0xffffffff - load_val); - omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW); - omap_dm_timer_start(gptimer); -} - -static inline void omap_32k_timer_stop(void) -{ - omap_dm_timer_stop(gptimer); -} - -static inline void omap_32k_timer_ack_irq(void) -{ - u32 status = omap_dm_timer_read_status(gptimer); - omap_dm_timer_write_status(gptimer, status); -} - -#endif - -static void omap_32k_timer_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) -{ - omap_32k_timer_stop(); - - switch (mode) { - case CLOCK_EVT_MODE_PERIODIC: - omap_32k_timer_start(OMAP_32K_TIMER_TICK_PERIOD); - break; - case CLOCK_EVT_MODE_ONESHOT: - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_SHUTDOWN: - break; - case CLOCK_EVT_MODE_RESUME: - break; - } -} - -static struct clock_event_device clockevent_32k_timer = { - .name = "32k-timer", - .features = CLOCK_EVT_FEAT_PERIODIC, - .shift = 32, - .set_mode = omap_32k_timer_set_mode, -}; - -/* - * The 32KHz synchronized timer is an additional timer on 16xx. - * It is always running. - */ -static inline unsigned long omap_32k_sync_timer_read(void) -{ - return omap_readl(TIMER_32K_SYNCHRONIZED); -} - -/* - * Rounds down to nearest usec. Note that this will overflow for larger values. - */ -static inline unsigned long omap_32k_ticks_to_usecs(unsigned long ticks_32k) -{ - return (ticks_32k * 5*5*5*5*5*5) >> 9; -} - -/* - * Rounds down to nearest nsec. - */ -static inline unsigned long long -omap_32k_ticks_to_nsecs(unsigned long ticks_32k) -{ - return (unsigned long long) ticks_32k * 1000 * 5*5*5*5*5*5 >> 9; -} - -/* - * Returns current time from boot in nsecs. It's OK for this to wrap - * around for now, as it's just a relative time stamp. - */ -unsigned long long sched_clock(void) -{ - return omap_32k_ticks_to_nsecs(omap_32k_sync_timer_read()); -} - -static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *evt = &clockevent_32k_timer; - omap_32k_timer_ack_irq(); - - evt->event_handler(evt); - - return IRQ_HANDLED; -} - -static struct irqaction omap_32k_timer_irq = { - .name = "32KHz timer", - .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, - .handler = omap_32k_timer_interrupt, -}; - -static __init void omap_init_32k_timer(void) -{ - if (cpu_class_is_omap1()) - setup_irq(INT_OS_TIMER, &omap_32k_timer_irq); - -#ifdef CONFIG_ARCH_OMAP2 - /* REVISIT: Check 24xx TIOCP_CFG settings after idle works */ - if (cpu_is_omap24xx()) { - gptimer = omap_dm_timer_request_specific(1); - BUG_ON(gptimer == NULL); - - omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_32_KHZ); - setup_irq(omap_dm_timer_get_irq(gptimer), &omap_32k_timer_irq); - omap_dm_timer_set_int_enable(gptimer, - OMAP_TIMER_INT_CAPTURE | OMAP_TIMER_INT_OVERFLOW | - OMAP_TIMER_INT_MATCH); - } -#endif - - clockevent_32k_timer.mult = div_sc(OMAP_32K_TICKS_PER_SEC, - NSEC_PER_SEC, - clockevent_32k_timer.shift); - clockevent_32k_timer.max_delta_ns = - clockevent_delta2ns(0xfffffffe, &clockevent_32k_timer); - clockevent_32k_timer.min_delta_ns = - clockevent_delta2ns(1, &clockevent_32k_timer); - - clockevent_32k_timer.cpumask = cpumask_of_cpu(0); - clockevents_register_device(&clockevent_32k_timer); -} - -/* - * --------------------------------------------------------------------------- - * Timer initialization - * --------------------------------------------------------------------------- - */ -static void __init omap_timer_init(void) -{ -#ifdef CONFIG_OMAP_DM_TIMER - omap_dm_timer_init(); -#endif - omap_init_32k_timer(); -} - -struct sys_timer omap_timer = { - .init = omap_timer_init, -}; |