cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

imx_ccm.c (2090B)

      1/*
      2 * IMX31 Clock Control Module
      3 *
      4 * Copyright (C) 2012 NICTA
      5 * Updated by Jean-Christophe Dubois <jcd@tribudubois.net>
      6 *
      7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
      8 * See the COPYING file in the top-level directory.
      9 *
     10 * This is an abstract base class used to get a common interface to
     11 * retrieve the CCM frequencies from the various i.MX SOC.
     12 */
     13
     14#include "qemu/osdep.h"
     15#include "hw/misc/imx_ccm.h"
     16#include "qemu/module.h"
     17
     18#ifndef DEBUG_IMX_CCM
     19#define DEBUG_IMX_CCM 0
     20#endif
     21
     22#define DPRINTF(fmt, args...) \
     23    do { \
     24        if (DEBUG_IMX_CCM) { \
     25            fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_CCM, \
     26                                             __func__, ##args); \
     27        } \
     28    } while (0)
     29
     30
     31uint32_t imx_ccm_get_clock_frequency(IMXCCMState *dev, IMXClk clock)
     32{
     33    uint32_t freq = 0;
     34    IMXCCMClass *klass = IMX_CCM_GET_CLASS(dev);
     35
     36    if (klass->get_clock_frequency) {
     37        freq = klass->get_clock_frequency(dev, clock);
     38    }
     39
     40    DPRINTF("(clock = %d) = %u\n", clock, freq);
     41
     42    return freq;
     43}
     44
     45/*
     46 * Calculate PLL output frequency
     47 */
     48uint32_t imx_ccm_calc_pll(uint32_t pllreg, uint32_t base_freq)
     49{
     50    int32_t freq;
     51    int32_t mfn = MFN(pllreg);  /* Numerator */
     52    uint32_t mfi = MFI(pllreg); /* Integer part */
     53    uint32_t mfd = 1 + MFD(pllreg); /* Denominator */
     54    uint32_t pd = 1 + PD(pllreg);   /* Pre-divider */
     55
     56    if (mfi < 5) {
     57        mfi = 5;
     58    }
     59
     60    /* mfn is 10-bit signed twos-complement */
     61    mfn <<= 32 - 10;
     62    mfn >>= 32 - 10;
     63
     64    freq = ((2 * (base_freq >> 10) * (mfi * mfd + mfn)) /
     65            (mfd * pd)) << 10;
     66
     67    DPRINTF("(pllreg = 0x%08x, base_freq = %u) = %d\n", pllreg, base_freq,
     68            freq);
     69
     70    return freq;
     71}
     72
     73static const TypeInfo imx_ccm_info = {
     74    .name          = TYPE_IMX_CCM,
     75    .parent        = TYPE_SYS_BUS_DEVICE,
     76    .instance_size = sizeof(IMXCCMState),
     77    .class_size    = sizeof(IMXCCMClass),
     78    .abstract      = true,
     79};
     80
     81static void imx_ccm_register_types(void)
     82{
     83    type_register_static(&imx_ccm_info);
     84}
     85
     86type_init(imx_ccm_register_types)