20d3d53433
This service is required by various coreboot code modules. It looks
like the 8064 SOC does not provide anything better than a 32 KHz free
running counter (it is used in u-boot for us timer as well). Let's use
this for now.
BUG=chrome-os-partner:27784
TEST=manual
. with the rest of the patches applied AP148 boots all the way to
trying to start the payload.
Original-Change-Id: I98b91ce179f7388d59c769a59caf49ca7640e047
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/197896
(cherry picked from commit d526830f9d9618e4ca3460165d7b9ecc8ab268cf)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: Id37ed21193db67ceee11a795713c34ef26383380
Reviewed-on: http://review.coreboot.org/7993
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* Copyright (c) 2012 - 2013 The Linux Foundation. All rights reserved.
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* Source : APQ8064 LK boot
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*
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* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google, Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <delay.h>
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#include <iomap.h>
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#include <ipq_timer.h>
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#include <timer.h>
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#define GPT_FREQ_KHZ 32
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#define GPT_FREQ (GPT_FREQ_KHZ * 1000) /* 32 KHz */
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/**
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* init_timer - initialize timer
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*/
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void init_timer(void)
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{
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writel(0, GPT_ENABLE);
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writel(GPT_ENABLE_EN, GPT_ENABLE);
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}
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/**
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* udelay - generates micro second delay.
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* @usec: delay duration in microseconds
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*
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* With 32KHz clock, minimum possible delay is 31.25 Micro seconds and
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* its multiples. In Rumi GPT clock is 32 KHz
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*/
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void udelay(unsigned usec)
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{
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unsigned val;
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unsigned now, last;
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unsigned runcount;
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usec = (usec + GPT_FREQ_KHZ - 1) / GPT_FREQ_KHZ;
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last = readl(GPT_COUNT_VAL);
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runcount = last;
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val = usec + last;
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do {
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now = readl(GPT_COUNT_VAL);
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if (last > now)
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runcount += ((GPT_FREQ - last) + now);
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else
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runcount += (now - last);
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last = now;
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} while (runcount < val);
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}
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void timer_monotonic_get(struct mono_time *mt)
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{
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mono_time_set_usecs(mt, (readl(GPT_COUNT_VAL) * 1000) / GPT_FREQ_KHZ);
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}
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#if 0
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/*
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* TODO(vbendeb) clean it up later.
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* Compile out the below code but leave it for now in case it will become
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* necessary later in order to make the platform fully functional.
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*/
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static unsigned long timestamp;
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static unsigned long lastinc;
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inline ulong gpt_to_sys_freq(unsigned int gpt)
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{
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/*
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* get_timer() expects the timer increments to be in terms
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* of CONFIG_SYS_HZ. Convert GPT timer values to CONFIG_SYS_HZ
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* units.
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*/
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return (((ulong)gpt) / (GPT_FREQ / CONFIG_SYS_HZ));
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}
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/**
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* get_timer_masked - returns current ticks
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*
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* Returns the current timer ticks, since boot.
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*/
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ulong get_timer_masked(void)
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{
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ulong now = gpt_to_sys_freq(readl(GPT_COUNT_VAL));
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if (lastinc <= now) { /* normal mode (non roll) */
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/* normal mode */
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timestamp += now - lastinc;
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/* move stamp forward with absolute diff ticks */
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} else { /* we have overflow of the count down timer */
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timestamp += now + (TIMER_LOAD_VAL - lastinc);
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}
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lastinc = now;
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return timestamp;
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}
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unsigned long long get_ticks(void)
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{
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return readl(GPT_COUNT_VAL);
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}
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/*
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* Return the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return GPT_FREQ;
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}
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#endif
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