/**************************************************************************** * boards/arm/sama5/jupiter-nano/include/board_396mhz.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __BOARDS_ARM_SAMA5_JUPITER_NANO_INCLUDE_BOARD_396MHZ_H #define __BOARDS_ARM_SAMA5_JUPITER_NANO_INCLUDE_BOARD_396MHZ_H /**************************************************************************** * Included Files ****************************************************************************/ #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Clocking *****************************************************************/ /* After power-on reset, the SAMA5 device is running on a 12MHz internal RC. * These definitions will configure operational clocking. * * This is the configuration provided in the Atmel example code. * This results in a CPU clock of 396MHz: * * MAINOSC: Frequency = 12MHz (crystal) * PLLA: PLL Multiplier = 66 to generate PLLACK = 792MHz * Master Clock (MCK): Source = PLLACK/2, Prescalar = 1, MDIV = 3 to generate * MCK = 132MHz * CPU clock = 396MHz */ /* Main oscillator register settings. * * The start up time should be should be: * Start Up Time = 8 * MOSCXTST / SLCK = 56 Slow Clock Cycles. */ #define BOARD_CKGR_MOR_MOSCXTST (62 << PMC_CKGR_MOR_MOSCXTST_SHIFT) /* Start-up Time */ /* PLLA configuration. * * Multipler = 66: PLLACK = 66 * 12MHz = 792MHz */ #define BOARD_CKGR_PLLAR_COUNT (63 << PMC_CKGR_PLLAR_COUNT_SHIFT) #define BOARD_CKGR_PLLAR_OUT (0) #define BOARD_CKGR_PLLAR_MUL (65 << PMC_CKGR_PLLAR_MUL_SHIFT) /* PMC master clock register settings. * * Master/Processor Clock Source Selection = PLLA * Master/Processor Clock Prescaler = 1 * PLLA Divider = 2 * Master Clock Division (MDIV) = 3 * * NOTE: Bit PLLADIV2 must always be set to 1 when MDIV is set to 3. * * Prescaler input = 792MHz / 2 = 396MHz * Prescaler output = 396MHz / 1 = 396MHz * Processor Clock (PCK) = 396MHz * Master clock (MCK) = 396MHz / 3 = 132MHz */ #define BOARD_PMC_MCKR_CSS PMC_MCKR_CSS_PLLA #define BOARD_PMC_MCKR_PRES PMC_MCKR_PRES_DIV1 #define BOARD_PMC_MCKR_PLLADIV PMC_MCKR_PLLADIV2 #define BOARD_PMC_MCKR_MDIV PMC_MCKR_MDIV_PCKDIV3 /* ADC Configuration * * ADCClock = MCK / ((PRESCAL+1) * 2) * * Given: * MCK = 132MHz * ADCClock = 8MHz * Then: * PRESCAL = 7.25 * * PRESCAL=7 and MCK=132MHz yields ADC clock of 8.25MHz */ #define BOARD_ADC_PRESCAL (7) #define BOARD_TSD_STARTUP (40) /* 40 nanoseconds */ #define BOARD_TSD_TRACKTIM (2000) /* Min 1us at 8MHz */ #define BOARD_TSD_DEBOUNCE (10000000) /* 10 milliseconds (units nanoseconds) */ /* Resulting frequencies */ #define BOARD_MAINCK_FREQUENCY BOARD_MAINOSC_FREQUENCY #define BOARD_PLLA_FREQUENCY (792000000) /* PLLACK: 66 * 12Mhz / 1 */ #define BOARD_PCK_FREQUENCY (396000000) /* CPU: PLLACK / 2 / 1 */ #define BOARD_MCK_FREQUENCY (132000000) /* MCK: PLLACK / 2 / 1 / 3 */ #define BOARD_ADCCLK_FREQUENCY (8250000) /* ADCCLK: MCK / ((7+1)*2) */ /* Clocking to certain peripherals may be MCK/2. * * REVISIT: I am not sure why this is. Perhaps because of H32MXDIV? */ #define BOARD_PIT_FREQUENCY (BOARD_MCK_FREQUENCY >> 1) #define BOARD_USART_FREQUENCY (BOARD_MCK_FREQUENCY >> 1) #define BOARD_FLEXCOM_FREQUENCY (BOARD_MCK_FREQUENCY >> 1) #if defined(CONFIG_SAMA5_EHCI) || defined(CONFIG_SAMA5_OHCI) || \ defined(CONFIG_SAMA5_UDPHS) /* The USB Host High Speed requires a 480 MHz clock (UPLLCK) for the embedded * High-speed transceivers. UPLLCK is the output of the 480 MHz UTMI PLL * (UPLL). The source clock of the UTMI PLL is the Main OSC output: Either * the 12MHz internal RC oscillator on a an external 12MHz crystal. The * Main OSC must be 12MHz because the UPLL has a built-in 40x multiplier. * * For High-speed operations, the user has to perform the following: * * 1) Enable UHP peripheral clock, bit (1 << AT91C_ID_UHPHS) in * PMC_PCER register. * 2) Write CKGR_PLLCOUNT field in PMC_UCKR register. * 3) Enable UPLL, bit AT91C_CKGR_UPLLEN in PMC_UCKR register. * 4) Wait until UTMI_PLL is locked. LOCKU bit in PMC_SR register * 5) Enable BIAS, bit AT91C_CKGR_BIASEN in PMC_UCKR register. * 6) Select UPLLCK as Input clock of OHCI part, USBS bit in PMC_USB * register. * 7) Program the OHCI clocks (UHP48M and UHP12M) with USBDIV field in * PMC_USB register. USBDIV must be 9 (division by 10) if UPLLCK is * selected. * 8) Enable OHCI clocks, UHP bit in PMC_SCER register. * * Steps 2 through 7 performed here. 1 and 8 are performed in the EHCI * driver is initialized. */ # define BOARD_USE_UPLL 1 /* Use UPLL for clock source */ # define BOARD_CKGR_UCKR_UPLLCOUNT (15) /* Maximum value */ # define BOARD_CKGR_UCKR_BIASCOUNT (15) /* Maximum value */ # define BOARD_UPLL_OHCI_DIV (10) /* Divide by 10 */ #endif /* HSMCI clocking * * Multimedia Card Interface clock (MCCK or MCI_CK) is Master Clock (MCK) * divided by (2*(CLKDIV) + CLOCKODD + 2). * * MCI_SPEED = MCK / (2*CLKDIV + CLOCKODD + 2) * * Where CLKDIV has a range of 0-255. */ /* MCK = 132MHz, * CLKDIV = 164, * MCI_SPEED = 132MHz / (2*164 + 0 + 2) = 400 KHz */ #define HSMCI_INIT_CLKDIV (164 << HSMCI_MR_CLKDIV_SHIFT) /* MCK = 132MHz, * CLKDIV = 2 w/CLOCKODD, * MCI_SPEED = 132MHz /(2*2 + 1 + 2) = 18.9 MHz */ #define HSMCI_MMCXFR_CLKDIV ((2 << HSMCI_MR_CLKDIV_SHIFT) | HSMCI_MR_CLKODD) /* MCK = 132MHz, CLKDIV = 2, MCI_SPEED = 132MHz /(2*2 + 0 + 2) = 22 MHz */ #define HSMCI_SDXFR_CLKDIV (2 << HSMCI_MR_CLKDIV_SHIFT) #define HSMCI_SDWIDEXFR_CLKDIV HSMCI_SDXFR_CLKDIV /**************************************************************************** * Public Data ****************************************************************************/ #ifndef __ASSEMBLY__ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) } #endif #endif /* !__ASSEMBLY__ */ #endif /* __BOARDS_ARM_SAMA5_JUPITER_NANO_INCLUDE_BOARD_396MHZ_H */