| /* Copyright (c) 2011, Code Aurora Forum. 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 Code Aurora Forum, Inc. 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 <sys/types.h> |
| |
| #include <platform/timer.h> |
| #include <platform/irqs.h> |
| #include <platform/iomap.h> |
| #include <platform/interrupts.h> |
| #include <kernel/thread.h> |
| |
| #define QTMR_TIMER_CTRL_ENABLE (1 << 0) |
| #define QTMR_TIMER_CTRL_INT_MASK (1 << 1) |
| |
| #define QTMR_TYPE_PHYSICAL 1 |
| #define QTMR_TYPE_VIRTUAL 2 |
| |
| static platform_timer_callback timer_callback; |
| static void *timer_arg; |
| static time_t timer_interval; |
| static unsigned int timer_type = QTMR_TYPE_PHYSICAL; |
| static volatile uint32_t ticks; |
| static uint32_t tick_count; |
| static uint32_t ppi_num = -1; |
| |
| static enum handler_return qtimer_irq(void *arg) |
| { |
| ticks += timer_interval; |
| |
| if (timer_type == QTMR_TYPE_VIRTUAL) |
| __asm__("mcr p15, 0, %0, c14, c3, 0"::"r"(tick_count)); |
| else if (timer_type == QTMR_TYPE_PHYSICAL) |
| __asm__("mcr p15, 0, %0, c14, c2, 0" : :"r" (tick_count)); |
| |
| return timer_callback(timer_arg, ticks); |
| } |
| |
| /* Programs the Virtual Down counter timer. |
| * interval : Counter ticks till expiry interrupt is fired. |
| */ |
| static unsigned int qtimer_set_virtual_timer(uint32_t interval) |
| { |
| uint32_t ctrl; |
| |
| /* Program CTRL Register */ |
| ctrl =0; |
| ctrl |= QTMR_TIMER_CTRL_ENABLE; |
| ctrl &= ~QTMR_TIMER_CTRL_INT_MASK; |
| |
| __asm__("mcr p15, 0, %0, c14, c3, 1"::"r"(ctrl)); |
| |
| /* Set Virtual Down Counter */ |
| __asm__("mcr p15, 0, %0, c14, c3, 0"::"r"(interval)); |
| |
| return INT_QTMR_VIRTUAL_TIMER_EXP; |
| |
| } |
| |
| /* Programs the Physical Secure Down counter timer. |
| * interval : Counter ticks till expiry interrupt is fired. |
| */ |
| static unsigned int qtimer_set_physical_timer(uint32_t interval) |
| { |
| uint32_t ctrl; |
| |
| /* Program CTRL Register */ |
| ctrl =0; |
| ctrl |= QTMR_TIMER_CTRL_ENABLE; |
| ctrl &= ~QTMR_TIMER_CTRL_INT_MASK; |
| |
| __asm__("mcr p15, 0, %0, c14, c2, 1" : :"r" (ctrl)); |
| |
| /* Set Physical Down Counter */ |
| __asm__("mcr p15, 0, %0, c14, c2, 0" : :"r" (interval)); |
| |
| return INT_QTMR_SECURE_PHYSICAL_TIMER_EXP; |
| |
| } |
| |
| |
| status_t platform_set_periodic_timer(platform_timer_callback callback, |
| void *arg, time_t interval) |
| { |
| tick_count = interval * platform_tick_rate() / 1000; |
| |
| enter_critical_section(); |
| |
| timer_callback = callback; |
| timer_arg = arg; |
| timer_interval = interval; |
| |
| if (timer_type == QTMR_TYPE_VIRTUAL) |
| ppi_num = qtimer_set_virtual_timer(tick_count); |
| else if (timer_type == QTMR_TYPE_PHYSICAL) |
| ppi_num = qtimer_set_physical_timer(tick_count); |
| |
| register_int_handler(ppi_num, qtimer_irq, 0); |
| unmask_interrupt(ppi_num); |
| |
| exit_critical_section(); |
| return 0; |
| } |
| |
| time_t current_time(void) |
| { |
| return ticks; |
| } |
| |
| void uninit_qtimer() |
| { |
| uint32_t ctrl; |
| |
| if (ppi_num == -1) |
| { |
| dprintf(CRITICAL, "Qtimer unintialized before initializing\n"); |
| return; |
| } |
| |
| mask_interrupt(ppi_num); |
| |
| /* program cntrl register */ |
| ctrl =0; |
| ctrl |= ~QTMR_TIMER_CTRL_ENABLE; |
| ctrl &= QTMR_TIMER_CTRL_INT_MASK; |
| |
| if (timer_type == QTMR_TYPE_VIRTUAL) |
| __asm__("mcr p15, 0, %0, c14, c3, 1"::"r"(ctrl)); |
| else if (timer_type == QTMR_TYPE_PHYSICAL) |
| __asm__("mcr p15, 0, %0, c14, c2, 1" : :"r" (ctrl)); |
| |
| } |
| |
| void mdelay(unsigned msecs) |
| { |
| uint32_t phy_cnt_lo, phy_cnt_hi, cnt, timeout = 0; |
| uint64_t phy_cnt; |
| msecs = msecs * platform_tick_rate() / 1000; |
| |
| do{ |
| /* read global counter */ |
| __asm__("mrrc p15,0,%0,%1, c14":"=r"(phy_cnt_lo),"=r"(phy_cnt_hi)); |
| phy_cnt = ((uint64_t)phy_cnt_hi << 32) | phy_cnt_lo; |
| /*Actual counter used in the simulation is only 32 bits |
| * in reality the counter is actually 56 bits. |
| */ |
| cnt = phy_cnt & (uint32_t)~0; |
| if (timeout == 0) |
| timeout = cnt + msecs; |
| } while (cnt < timeout); |
| |
| } |
| |
| void udelay(unsigned usecs) |
| { |
| uint32_t phy_cnt_lo, phy_cnt_hi, cnt, timeout = 0; |
| uint64_t phy_cnt; |
| usecs = (usecs * platform_tick_rate()) / 1000000; |
| |
| do{ |
| /* read global counter */ |
| __asm__("mrrc p15,0,%0,%1, c14":"=r"(phy_cnt_lo),"=r"(phy_cnt_hi)); |
| phy_cnt = ((uint64_t)phy_cnt_hi << 32) | phy_cnt_lo; |
| |
| /*Actual counter used in the simulation is only 32 bits |
| * in reality the counter is actually 56 bits. |
| */ |
| cnt = phy_cnt & (uint32_t)~0; |
| if (timeout == 0) |
| timeout = cnt + usecs; |
| } while (cnt < timeout); |
| } |
| |
| /* Return current time in micro seconds */ |
| bigtime_t current_time_hires(void) |
| { |
| return ticks * 1000000ULL; |
| } |