Deepa Dinamani | dc036ae | 2011-12-20 18:19:52 -0800 | [diff] [blame^] | 1 | /* Copyright (c) 2011, Code Aurora Forum. All rights reserved. |
| 2 | |
| 3 | * Redistribution and use in source and binary forms, with or without |
| 4 | * modification, are permitted provided that the following conditions are |
| 5 | * met: |
| 6 | * * Redistributions of source code must retain the above copyright |
| 7 | * notice, this list of conditions and the following disclaimer. |
| 8 | * * Redistributions in binary form must reproduce the above |
| 9 | * copyright notice, this list of conditions and the following |
| 10 | * disclaimer in the documentation and/or other materials provided |
| 11 | * with the distribution. |
| 12 | * * Neither the name of Code Aurora Forum, Inc. nor the names of its |
| 13 | * contributors may be used to endorse or promote products derived |
| 14 | * from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 23 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 25 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| 26 | * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <debug.h> |
| 30 | #include <reg.h> |
| 31 | #include <sys/types.h> |
| 32 | |
| 33 | #include <platform/timer.h> |
| 34 | #include <platform/irqs.h> |
| 35 | #include <platform/iomap.h> |
| 36 | #include <platform/interrupts.h> |
| 37 | #include <kernel/thread.h> |
| 38 | |
| 39 | #define QTMR_TIMER_CTRL_ENABLE (1 << 0) |
| 40 | #define QTMR_TIMER_CTRL_INT_MASK (1 << 1) |
| 41 | |
| 42 | #define PLATFORM_TIMER_TYPE_PHYSICAL 1 |
| 43 | #define PLATFORM_TIMER_TYPE_VIRTUAL 2 |
| 44 | |
| 45 | static platform_timer_callback timer_callback; |
| 46 | static void *timer_arg; |
| 47 | static time_t timer_interval; |
| 48 | static unsigned int timer_type = PLATFORM_TIMER_TYPE_PHYSICAL; |
| 49 | static volatile uint32_t ticks; |
| 50 | |
| 51 | static enum handler_return timer_irq(void *arg) |
| 52 | { |
| 53 | ticks += timer_interval; |
| 54 | |
| 55 | if (timer_type == PLATFORM_TIMER_TYPE_VIRTUAL) |
| 56 | __asm__("mcr p15, 0, %0, c14, c3, 0"::"r"(timer_interval)); |
| 57 | else if (timer_type == PLATFORM_TIMER_TYPE_PHYSICAL) |
| 58 | __asm__("mcr p15, 0, %0, c14, c2, 0" : :"r" (timer_interval)); |
| 59 | |
| 60 | return timer_callback(timer_arg, ticks); |
| 61 | } |
| 62 | |
| 63 | /* Programs the Virtual Down counter timer. |
| 64 | * interval : Counter ticks till expiry interrupt is fired. |
| 65 | */ |
| 66 | unsigned int platform_set_virtual_timer(uint32_t interval) |
| 67 | { |
| 68 | uint32_t ctrl; |
| 69 | |
| 70 | /* Program CTRL Register */ |
| 71 | ctrl =0; |
| 72 | ctrl |= QTMR_TIMER_CTRL_ENABLE; |
| 73 | ctrl &= ~QTMR_TIMER_CTRL_INT_MASK; |
| 74 | |
| 75 | __asm__("mcr p15, 0, %0, c14, c3, 1"::"r"(ctrl)); |
| 76 | |
| 77 | /* Set Virtual Down Counter */ |
| 78 | __asm__("mcr p15, 0, %0, c14, c3, 0"::"r"(interval)); |
| 79 | |
| 80 | return INT_QTMR_VIRTUAL_TIMER_EXP; |
| 81 | |
| 82 | } |
| 83 | |
| 84 | /* Programs the Physical Secure Down counter timer. |
| 85 | * interval : Counter ticks till expiry interrupt is fired. |
| 86 | */ |
| 87 | unsigned int platform_set_physical_timer(uint32_t interval) |
| 88 | { |
| 89 | uint32_t ctrl; |
| 90 | |
| 91 | /* Program CTRL Register */ |
| 92 | ctrl =0; |
| 93 | ctrl |= QTMR_TIMER_CTRL_ENABLE; |
| 94 | ctrl &= ~QTMR_TIMER_CTRL_INT_MASK; |
| 95 | |
| 96 | __asm__("mcr p15, 0, %0, c14, c2, 1" : :"r" (ctrl)); |
| 97 | |
| 98 | /* Set Physical Down Counter */ |
| 99 | __asm__("mcr p15, 0, %0, c14, c2, 0" : :"r" (interval)); |
| 100 | |
| 101 | return INT_QTMR_SECURE_PHYSICAL_TIMER_EXP; |
| 102 | |
| 103 | } |
| 104 | |
| 105 | |
| 106 | status_t platform_set_periodic_timer(platform_timer_callback callback, |
| 107 | void *arg, time_t interval) |
| 108 | { |
| 109 | uint32_t ppi_num; |
| 110 | unsigned long ctrl; |
| 111 | uint32_t tick_count = interval * platform_tick_rate() / 1000; |
| 112 | |
| 113 | enter_critical_section(); |
| 114 | |
| 115 | timer_callback = callback; |
| 116 | timer_arg = arg; |
| 117 | timer_interval = interval; |
| 118 | |
| 119 | if (timer_type == PLATFORM_TIMER_TYPE_VIRTUAL) |
| 120 | ppi_num = platform_set_virtual_timer(tick_count); |
| 121 | else if (timer_type == PLATFORM_TIMER_TYPE_PHYSICAL) |
| 122 | ppi_num = platform_set_physical_timer(tick_count); |
| 123 | |
| 124 | register_int_handler(ppi_num, timer_irq, 0); |
| 125 | unmask_interrupt(ppi_num); |
| 126 | |
| 127 | exit_critical_section(); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | time_t current_time(void) |
| 132 | { |
| 133 | return ticks; |
| 134 | } |
| 135 | |
| 136 | void platform_uninit_timer(void) |
| 137 | { |
| 138 | uint32_t ctrl; |
| 139 | |
| 140 | unmask_interrupt(INT_DEBUG_TIMER_EXP); |
| 141 | |
| 142 | /* program cntrl register */ |
| 143 | ctrl =0; |
| 144 | ctrl |= ~QTMR_TIMER_CTRL_ENABLE; |
| 145 | ctrl &= QTMR_TIMER_CTRL_INT_MASK; |
| 146 | |
| 147 | if (timer_type == PLATFORM_TIMER_TYPE_VIRTUAL) |
| 148 | __asm__("mcr p15, 0, %0, c14, c3, 1"::"r"(ctrl)); |
| 149 | else if (timer_type == PLATFORM_TIMER_TYPE_PHYSICAL) |
| 150 | __asm__("mcr p15, 0, %0, c14, c2, 1" : :"r" (ctrl)); |
| 151 | |
| 152 | } |
| 153 | |
| 154 | void mdelay(unsigned msecs) |
| 155 | { |
| 156 | uint32_t phy_cnt_lo, phy_cnt_hi, cnt, timeout = 0; |
| 157 | uint64_t phy_cnt; |
| 158 | msecs = msecs * platform_tick_rate() / 1000; |
| 159 | |
| 160 | do{ |
| 161 | /* read global counter */ |
| 162 | __asm__("mrrc p15,0,%0,%1, c14":"=r"(phy_cnt_lo),"=r"(phy_cnt_hi)); |
| 163 | phy_cnt = ((uint64_t)phy_cnt_hi << 32) | phy_cnt_lo; |
| 164 | /*Actual counter used in the simulation is only 32 bits |
| 165 | * in reality the counter is actually 56 bits. |
| 166 | */ |
| 167 | cnt = phy_cnt & (uint32_t)~0; |
| 168 | if (timeout == 0) |
| 169 | timeout = cnt + msecs; |
| 170 | } while (cnt < timeout); |
| 171 | |
| 172 | } |
| 173 | |
| 174 | void udelay(unsigned usecs) |
| 175 | { |
| 176 | uint32_t phy_cnt_lo, phy_cnt_hi, cnt, timeout = 0; |
| 177 | uint64_t phy_cnt; |
| 178 | usecs = (usecs * platform_tick_rate()) / 1000000; |
| 179 | |
| 180 | do{ |
| 181 | /* read global counter */ |
| 182 | __asm__("mrrc p15,0,%0,%1, c14":"=r"(phy_cnt_lo),"=r"(phy_cnt_hi)); |
| 183 | phy_cnt = ((uint64_t)phy_cnt_hi << 32) | phy_cnt_lo; |
| 184 | |
| 185 | /*Actual counter used in the simulation is only 32 bits |
| 186 | * in reality the counter is actually 56 bits. |
| 187 | */ |
| 188 | cnt = phy_cnt & (uint32_t)~0; |
| 189 | if (timeout == 0) |
| 190 | timeout = cnt + usecs; |
| 191 | } while (cnt < timeout); |
| 192 | } |
| 193 | |
| 194 | /* Return current time in micro seconds */ |
| 195 | bigtime_t current_time_hires(void) |
| 196 | { |
| 197 | return ticks * 1000000ULL; |
| 198 | } |