Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/*
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* IMX31 Clock Control Module
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*
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* Copyright (C) 2012 NICTA
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* Updated by Jean-Christophe Dubois <[email protected]>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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* This is an abstract base class used to get a common interface to
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* retrieve the CCM frequencies from the various i.MX SOC.
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*/
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#include "qemu/osdep.h"
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#include "hw/misc/imx_ccm.h"
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#include "qemu/module.h"
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#include "trace.h"
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uint32_t imx_ccm_get_clock_frequency(IMXCCMState *dev, IMXClk clock)
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{
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uint32_t freq = 0;
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IMXCCMClass *klass = IMX_CCM_GET_CLASS(dev);
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if (klass->get_clock_frequency) {
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freq = klass->get_clock_frequency(dev, clock);
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}
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trace_imx_ccm_get_clock_frequency(clock, freq);
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return freq;
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}
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/*
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* Calculate PLL output frequency
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*/
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uint32_t imx_ccm_calc_pll(uint32_t pllreg, uint32_t base_freq)
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{
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int32_t freq;
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int32_t mfn = MFN(pllreg); /* Numerator */
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uint32_t mfi = MFI(pllreg); /* Integer part */
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uint32_t mfd = 1 + MFD(pllreg); /* Denominator */
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uint32_t pd = 1 + PD(pllreg); /* Pre-divider */
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if (mfi < 5) {
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mfi = 5;
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}
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/* mfn is 10-bit signed twos-complement */
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mfn <<= 32 - 10;
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mfn >>= 32 - 10;
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freq = ((2 * (base_freq >> 10) * (mfi * mfd + mfn)) /
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(mfd * pd)) << 10;
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trace_imx_ccm_calc_pll(pllreg, base_freq, freq);
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return freq;
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}
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static const TypeInfo imx_ccm_info = {
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.name = TYPE_IMX_CCM,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(IMXCCMState),
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.class_size = sizeof(IMXCCMClass),
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.abstract = true,
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};
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static void imx_ccm_register_types(void)
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{
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type_register_static(&imx_ccm_info);
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}
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type_init(imx_ccm_register_types)
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