/**************************************************************************** * boards/arm/sama5/jupiter-nano/include/board_384mhz.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_384MHZ_H #define __BOARDS_ARM_SAMA5_JUPITER_NANO_INCLUDE_BOARD_384MHZ_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 an alternative slower configuration that will produce a 48MHz USB * clock with the required accuracy. * When used with OHCI, an additional requirement is the PLLACK be a multiple * of 48MHz. * This setup results in a CPU clock of 384MHz. * * MAINOSC: Frequency = 12MHz (crystal) * PLLA: PLL Multiplier = 64 to generate PLLACK = 768MHz * Master Clock (MCK): Source = PLLACK/2, Prescalar = 1, MDIV = 3 to generate * MCK = 128MHz * CPU clock = 384MHz */ /* 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 = 64: PLLACK = 64 * 12MHz = 768MHz */ #define BOARD_CKGR_PLLAR_COUNT (63 << PMC_CKGR_PLLAR_COUNT_SHIFT) #define BOARD_CKGR_PLLAR_OUT (0) #define BOARD_CKGR_PLLAR_MUL (63 << 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 = 768MHz / 2 = 384MHz * Prescaler output = 384MHz / 1 = 384MHz * Processor Clock (PCK) = 384MHz * Master clock (MCK) = 396MHz / 3 = 128MHz */ #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 #if defined(CONFIG_SAMA5_EHCI) || defined(CONFIG_SAMA5_OHCI) || \ defined(CONFIG_SAMA5_UDPHS) /* For OHCI Full-speed operations, the user has to perform the following: * * 1) Enable UHP peripheral clock, bit (1 << AT91C_ID_UHPHS) in PMC_PCER * register. * 2) Select PLLACK as Input clock of OHCI part, USBS bit in PMC_USB * register. * 3) Program the OHCI clocks (UHP48M and UHP12M) with USBDIV field in * PMC_USB register. USBDIV value is calculated regarding the PLLACK * value and USB Full-speed accuracy. * 4) Enable the OHCI clocks, UHP bit in PMC_SCER register. * * "The USB Host controller requires 48 MHz and 12 MHz clocks for OHCI * full-speed operations. These clocks must be generated by a PLL with a * correct accuracy of +/- 0.25% thanks to USBDIV field. * * "Thus the USB Host peripheral receives three clocks from the Power * Management Controller (PMC): the Peripheral Clock (MCK domain), the * UHP48M and the UHP12M (built-in UHP48M divided by four) used by the * OHCI to interface with the bus USB signals (Recovered 12 MHz domain) * in Full-speed operations" * * USB Clock = PLLACK / (USBDIV + 1) = 48MHz * USBDIV = PLLACK / 48MHz - 1 * = 15 * * The maximum value of USBDIV is 15 corresponding to a divisor of 16. * REVISIT: However, using the divisor of (15+1) yields a frame rate * of 500 frames per second. A divisor of (7+1) gives the correct 1MS * frame rate. I cannot explain the factor of 2 difference. */ # undef BOARD_USE_UPLL /* Use PLLA as source clock */ # define BOARD_OHCI_INPUT PMC_USB_USBS_PLLA /* Input is PLLACK */ # if 1 /* REVISIT */ # define BOARD_OHCI_DIVIDER (7) /* Divided by 8 */ # else # define BOARD_OHCI_DIVIDER (15) /* Divided by 16 */ # endif #endif /* ADC Configuration * * ADCClock = MCK / ((PRESCAL+1) * 2) * * Given: * MCK = 128MHz * ADCClock = 8MHz * Then: * PRESCAL = 7 */ #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 (768000000) /* PLLACK: 64 * 12Mhz / 1 */ #define BOARD_PCK_FREQUENCY (384000000) /* CPU: PLLACK / 2 / 1 */ #define BOARD_MCK_FREQUENCY (128000000) /* MCK: PLLACK / 2 / 1 / 3 */ #define BOARD_ADCCLK_FREQUENCY (8000000) /* 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) /* 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 = 128MHz, * CLKDIV = 159, * MCI_SPEED = 128MHz / (2*159 + 0 + 2) = 400 KHz */ #define HSMCI_INIT_CLKDIV (159 << HSMCI_MR_CLKDIV_SHIFT) /* MCK = 128MHz, * CLKDIV = 2 w/CLOCKODD, * MCI_SPEED = 128MHz /(2*2 + 1 + 2) = 18.3 MHz */ #define HSMCI_MMCXFR_CLKDIV ((2 << HSMCI_MR_CLKDIV_SHIFT) | HSMCI_MR_CLKODD) /* MCK = 128MHz, CLKDIV = 2, MCI_SPEED = 128MHz /(2*2 + 0 + 2) = 21.3 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_384MHZ_H */