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https://github.com/Telecominfraproject/OpenCellular.git
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850ef52982
BUG=None TEST=make -j buildall BRANCH=None Change-Id: I88fa219cd9e573c1544400d24d00c4fdec93840f Signed-off-by: Kevin K Wong <kevin.k.wong@intel.com> Reviewed-on: https://chromium-review.googlesource.com/237272 Reviewed-by: Vic Yang <victoryang@chromium.org>
50 lines
1.0 KiB
C
50 lines
1.0 KiB
C
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Clocks and power management settings */
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#include "clock.h"
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#include "common.h"
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#include "console.h"
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#include "registers.h"
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#include "util.h"
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/* Console output macros */
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#define CPUTS(outstr) cputs(CC_CLOCK, outstr)
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#define CPRINTS(format, args...) cprints(CC_CLOCK, format, ## args)
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static int freq = 48000000;
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void clock_wait_cycles(uint32_t cycles)
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{
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asm("1: subs %0, #1\n"
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" bne 1b\n" :: "r"(cycles));
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}
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int clock_get_freq(void)
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{
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return freq;
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}
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void clock_init(void)
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{
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#ifdef CONFIG_CLOCK_CRYSTAL
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/* XOSEL: 0 = Parallel resonant crystal */
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MEC1322_VBAT_CE &= ~0x1;
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#else
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/* XOSEL: 1 = Single ended clock source */
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MEC1322_VBAT_CE |= 0x1;
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#endif
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/* 32K clock enable */
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MEC1322_VBAT_CE |= 0x2;
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#ifdef CONFIG_CLOCK_CRYSTAL
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/* Wait for crystal to stabilize (OSC_LOCK == 1) */
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while (!(MEC1322_PCR_CHIP_OSC_ID & 0x100))
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;
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#endif
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}
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