BeagleBoardPkg/Library/BeagleBoardLib/Clock.c

   1 /** @file
   2
   3   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <Library/IoLib.h>
  10 #include <Library/DebugLib.h>
  11
  12 #include <Omap3530/Omap3530.h>
  13
  14 VOID
  15 ClockInit (
  16   VOID
  17   )
  18 {
  19   //DPLL1 - DPLL4 are configured part of Configuration header which OMAP3 ROM parses.
  20
  21   // Enable PLL5 and set to 120 MHz as a reference clock.
  22   MmioWrite32 (CM_CLKSEL4_PLL, CM_CLKSEL_PLL_MULT(120) | CM_CLKSEL_PLL_DIV(13));
  23   MmioWrite32 (CM_CLKSEL5_PLL, CM_CLKSEL_DIV_120M(1));
  24   MmioWrite32 (CM_CLKEN2_PLL, CM_CLKEN_FREQSEL_075_100 | CM_CLKEN_ENABLE);
  25
  26   // Turn on functional & interface clocks to the USBHOST power domain
  27   MmioOr32(CM_FCLKEN_USBHOST, CM_FCLKEN_USBHOST_EN_USBHOST2_ENABLE
  28                               | CM_FCLKEN_USBHOST_EN_USBHOST1_ENABLE);
  29   MmioOr32(CM_ICLKEN_USBHOST, CM_ICLKEN_USBHOST_EN_USBHOST_ENABLE);
  30
  31   // Turn on functional & interface clocks to the USBTLL block.
  32   MmioOr32(CM_FCLKEN3_CORE, CM_FCLKEN3_CORE_EN_USBTLL_ENABLE);
  33   MmioOr32(CM_ICLKEN3_CORE, CM_ICLKEN3_CORE_EN_USBTLL_ENABLE);
  34
  35   // Turn on functional & interface clocks to MMC1 and I2C1 modules.
  36   MmioOr32(CM_FCLKEN1_CORE, CM_FCLKEN1_CORE_EN_MMC1_ENABLE
  37                             | CM_FCLKEN1_CORE_EN_I2C1_ENABLE);
  38   MmioOr32(CM_ICLKEN1_CORE, CM_ICLKEN1_CORE_EN_MMC1_ENABLE
  39                             | CM_ICLKEN1_CORE_EN_I2C1_ENABLE);
  40
  41   // Turn on functional & interface clocks to various Peripherals.
  42   MmioOr32(CM_FCLKEN_PER, CM_FCLKEN_PER_EN_UART3_ENABLE
  43                           | CM_FCLKEN_PER_EN_GPT4_ENABLE
  44                           | CM_FCLKEN_PER_EN_GPIO2_ENABLE
  45                           | CM_FCLKEN_PER_EN_GPIO3_ENABLE
  46                           | CM_FCLKEN_PER_EN_GPIO4_ENABLE
  47                           | CM_FCLKEN_PER_EN_GPIO5_ENABLE
  48                           | CM_FCLKEN_PER_EN_GPIO6_ENABLE);
  49   MmioOr32(CM_ICLKEN_PER, CM_ICLKEN_PER_EN_UART3_ENABLE
  50                           | CM_ICLKEN_PER_EN_GPT3_ENABLE
  51                           | CM_ICLKEN_PER_EN_GPT4_ENABLE
  52                           | CM_ICLKEN_PER_EN_GPIO2_ENABLE
  53                           | CM_ICLKEN_PER_EN_GPIO3_ENABLE
  54                           | CM_ICLKEN_PER_EN_GPIO4_ENABLE
  55                           | CM_ICLKEN_PER_EN_GPIO5_ENABLE
  56                           | CM_ICLKEN_PER_EN_GPIO6_ENABLE);
  57
  58   // Turn on functional & inteface clocks to various wakeup modules.
  59   MmioOr32(CM_FCLKEN_WKUP, CM_FCLKEN_WKUP_EN_GPIO1_ENABLE
  60                            | CM_FCLKEN_WKUP_EN_WDT2_ENABLE);
  61   MmioOr32(CM_ICLKEN_WKUP, CM_ICLKEN_WKUP_EN_GPIO1_ENABLE
  62                            | CM_ICLKEN_WKUP_EN_WDT2_ENABLE);
  63 }