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Diffstat (limited to 'payloads/libpayload/arch/armv7/timer.c')
-rw-r--r-- | payloads/libpayload/arch/armv7/timer.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/armv7/timer.c b/payloads/libpayload/arch/armv7/timer.c new file mode 100644 index 0000000000..24b0a0fa34 --- /dev/null +++ b/payloads/libpayload/arch/armv7/timer.c @@ -0,0 +1,101 @@ +/* + * This file is part of the libpayload project. + * + * Copyright (C) 2008 Advanced Micro Devices, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 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. + */ + +/** + * @file armv7/timer.c + * ARMv7 specific timer routines + */ + +#include <libpayload.h> + +/** + * @ingroup arch + * Global variable containing the speed of the processor in KHz. + */ +u32 cpu_khz; + +/** + * Calculate the speed of the processor for use in delays. + * + * @return The CPU speed in kHz. + */ +unsigned int get_cpu_speed(void) +{ + /* FIXME */ + cpu_khz = 1000000U; + + return cpu_khz; +} + +static inline void _delay(unsigned long long delta) +{ + /* FIXME */ +} + +/** + * Delay for a specified number of nanoseconds. + * + * @param n Number of nanoseconds to delay for. + */ +void ndelay(unsigned int n) +{ + _delay((unsigned long long)n * cpu_khz / 1000000); +} + +/** + * Delay for a specified number of microseconds. + * + * @param n Number of microseconds to delay for. + */ +void udelay(unsigned int n) +{ + _delay((unsigned long long)n * cpu_khz / 1000); +} + +/** + * Delay for a specified number of milliseconds. + * + * @param m Number of milliseconds to delay for. + */ +void mdelay(unsigned int m) +{ + _delay((unsigned long long)m * cpu_khz); +} + +/** + * Delay for a specified number of seconds. + * + * @param s Number of seconds to delay for. + */ +void delay(unsigned int s) +{ + int i; + for (i=0; i<1000; i++) + _delay((unsigned long long)s * cpu_khz); +} |