From a6935c2508c426f30d6bf5bcf4c3130277a0f998 Mon Sep 17 00:00:00 2001 From: Varadarajan Narayanan Date: Wed, 2 Mar 2016 16:57:10 +0530 Subject: soc/qualcomm/ipq40xx: Initial commit for IPQ40xx SoC support Copy 'ipq806x' files as a template BUG=chrome-os-partner:49249 TEST=None. Initial code not sure if it will even compile BRANCH=none Original-Commit-Id: dc6a5937953fe61cd4b5a99ca49f9371c4b712d4 Original-Change-Id: If171fcdd3b0561cb6b7dab5f8434de7ef711ea41 Original-Signed-off-by: Varadarajan Narayanan Original-Signed-off-by: Kan Yan Original-Reviewed-on: https://chromium-review.googlesource.com/333178 Original-Commit-Ready: David Hendricks Original-Tested-by: David Hendricks Original-Reviewed-by: David Hendricks squashed: soc/qualcomm/ipq40xx: Update ipq806x/storm references Since the files were taken from ipq806x/storm as template. Update those references to reflect ipq40xx/gale. BUG=chrome-os-partner:49249 TEST=None. Initial code not sure if it will even compile BRANCH=none Original-Commit-Id: c6c76d184cc92c09e6826fbdc7d7fac59b2cb69b Original-Change-Id: Ieae1bce25291243b4a6034d37a6949978f318997 Original-Signed-off-by: Varadarajan Narayanan Original-Reviewed-on: https://chromium-review.googlesource.com/333293 Original-Commit-Ready: David Hendricks Original-Tested-by: David Hendricks Original-Reviewed-by: David Hendricks Change-Id: Ie5794c48131ae562861074b406106734541880d9 Signed-off-by: Patrick Georgi Reviewed-on: https://review.coreboot.org/14644 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth --- src/soc/qualcomm/ipq40xx/timer.c | 98 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 src/soc/qualcomm/ipq40xx/timer.c (limited to 'src/soc/qualcomm/ipq40xx/timer.c') diff --git a/src/soc/qualcomm/ipq40xx/timer.c b/src/soc/qualcomm/ipq40xx/timer.c new file mode 100644 index 0000000000..7b8c1f0cf6 --- /dev/null +++ b/src/soc/qualcomm/ipq40xx/timer.c @@ -0,0 +1,98 @@ +/* + * Copyright (c) 2011 - 2014 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 +#include +#include +#include + +/* + * DGT runs at 25 MHz / 4, or 6.25 ticks per microsecond + */ +#define DGT_MHZ_NUM 25 +#define DGT_MHZ_DEN 4 + +#define TIMER_TICKS(us) ((DGT_MHZ_NUM*(us) + (DGT_MHZ_DEN - 1)) / DGT_MHZ_DEN) +#define TIMER_USECS(ticks) (DGT_MHZ_DEN*(ticks) / DGT_MHZ_NUM) + +/* Clock divider values for the timer. */ +#define DGT_CLK_DIV_1 0 +#define DGT_CLK_DIV_2 1 +#define DGT_CLK_DIV_3 2 +#define DGT_CLK_DIV_4 3 + +/** + * init_timer - initialize timer + */ +void init_timer(void) +{ + /* disable timer */ + writel_i(0, DGT_ENABLE); + + /* DGT uses TCXO source which is 25MHz. + * The timer should run at 1/4th the frequency of TCXO + * according to clock plan. + * Set clock divider to 4. + */ + writel_i(DGT_CLK_DIV_4, DGT_CLK_CTL); + + /* Enable timer */ + writel_i(0, DGT_CLEAR); + writel_i(DGT_ENABLE_EN, DGT_ENABLE); +} + +/** + * udelay - generates micro second delay. + * @param usec: delay duration in microseconds + */ +void udelay(unsigned usec) +{ + uint32_t now; + uint32_t last; + uint32_t ticks; + uint32_t curr_ticks = 0; + + /* Calculate number of ticks required. */ + ticks = TIMER_TICKS(usec); + + /* Obtain the current timer value. */ + last = readl_i(DGT_COUNT_VAL); + + /* Loop until the right number of ticks. */ + while (curr_ticks < ticks) { + now = readl_i(DGT_COUNT_VAL); + curr_ticks += now - last; + last = now; + } +} + +void timer_monotonic_get(struct mono_time *mt) +{ + mono_time_set_usecs(mt, TIMER_USECS(readl_i(DGT_COUNT_VAL))); +} -- cgit v1.2.3