| /* Copyright (c) 2012, The Linux Foundation. All rights reserved. |
| |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * * Neither the name of The Linux Foundation nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| * 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. |
| */ |
| |
| #include <debug.h> |
| #include <reg.h> |
| #include <compiler.h> |
| #include <qtimer.h> |
| #include <arch/defines.h> |
| #include <platform/irqs.h> |
| #include <platform/iomap.h> |
| #include <platform/interrupts.h> |
| #include <qtimer_mmap_hw.h> |
| |
| static platform_timer_callback timer_callback; |
| static void *timer_arg; |
| static time_t timer_interval; |
| /* time in ms from start of LK. */ |
| static volatile uint32_t current_time; |
| static uint32_t tick_count; |
| |
| static void qtimer_enable(); |
| |
| static enum handler_return qtimer_irq(void *arg) |
| { |
| current_time += timer_interval; |
| |
| /* Program the down counter again to get |
| * an interrupt after timer_interval msecs |
| */ |
| writel(tick_count, QTMR_V1_CNTP_TVAL); |
| dsb(); |
| |
| return timer_callback(timer_arg, current_time); |
| } |
| |
| |
| /* Programs the Physical Secure Down counter timer. |
| * interval : Counter ticks till expiry interrupt is fired. |
| */ |
| void qtimer_set_physical_timer(time_t msecs_interval, |
| platform_timer_callback tmr_callback, |
| void *tmr_arg) |
| { |
| qtimer_disable(); |
| |
| /* Save the timer interval and call back data*/ |
| tick_count = msecs_interval * qtimer_tick_rate() / 1000;; |
| timer_interval = msecs_interval; |
| timer_arg = tmr_arg; |
| timer_callback = tmr_callback; |
| |
| /* Set Physical Down Counter */ |
| writel(tick_count, QTMR_V1_CNTP_TVAL); |
| dsb(); |
| |
| register_int_handler(INT_QTMR_FRM_0_PHYSICAL_TIMER_EXP, qtimer_irq, 0); |
| |
| unmask_interrupt(INT_QTMR_FRM_0_PHYSICAL_TIMER_EXP); |
| |
| qtimer_enable(); |
| } |
| |
| |
| /* Function to return the frequency of the timer */ |
| uint32_t qtimer_get_frequency() |
| { |
| uint32_t freq; |
| |
| /* Read the Global counter frequency */ |
| /* freq = readl(QTMR_V1_CNTFRQ); */ |
| /* TODO: remove this when bootchaint sets up the frequency. */ |
| freq = 19200000; |
| |
| return freq; |
| } |
| |
| static void qtimer_enable() |
| { |
| uint32_t ctrl; |
| |
| ctrl = readl(QTMR_V1_CNTP_CTL); |
| |
| /* Program CTRL Register */ |
| ctrl |= QTMR_TIMER_CTRL_ENABLE; |
| ctrl &= ~QTMR_TIMER_CTRL_INT_MASK; |
| |
| writel(ctrl, QTMR_V1_CNTP_CTL); |
| dsb(); |
| } |
| |
| void qtimer_disable() |
| { |
| uint32_t ctrl; |
| |
| ctrl = readl(QTMR_V1_CNTP_CTL); |
| |
| /* program cntrl register */ |
| ctrl &= ~QTMR_TIMER_CTRL_ENABLE; |
| ctrl |= QTMR_TIMER_CTRL_INT_MASK; |
| |
| writel(ctrl, QTMR_V1_CNTP_CTL); |
| dsb(); |
| } |
| |
| inline __ALWAYS_INLINE uint64_t qtimer_get_phy_timer_cnt() |
| { |
| uint32_t phy_cnt_lo; |
| uint32_t phy_cnt_hi_1; |
| uint32_t phy_cnt_hi_2; |
| |
| do { |
| phy_cnt_hi_1 = readl(QTMR_V1_CNTPCT_HI); |
| phy_cnt_lo = readl(QTMR_V1_CNTPCT_LO); |
| phy_cnt_hi_2 = readl(QTMR_V1_CNTPCT_HI); |
| } while (phy_cnt_hi_1 != phy_cnt_hi_2); |
| |
| return ((uint64_t)phy_cnt_hi_1 << 32) | phy_cnt_lo; |
| } |
| |
| uint32_t qtimer_current_time() |
| { |
| return current_time; |
| } |