diff --git a/arch/arm/src/am335x/Make.defs b/arch/arm/src/am335x/Make.defs index 7aea218c536..e3032d691cc 100644 --- a/arch/arm/src/am335x/Make.defs +++ b/arch/arm/src/am335x/Make.defs @@ -126,6 +126,7 @@ CHIP_ASRCS = CHIP_CSRCS = am335x_boot.c am335x_clockconfig.c am335x_pinmux.c am335x_irq.c CHIP_CSRCS += am335x_gpio.c am335x_lowputc.c am335x_serial.c am335x_wdog.c +CHIP_CSRCS += am335x_sysclk.c ifneq ($(CONFIG_SCHED_TICKLESS),y) CHIP_CSRCS += am335x_timerisr.c diff --git a/arch/arm/src/am335x/am335x_sysclk.c b/arch/arm/src/am335x/am335x_sysclk.c new file mode 100644 index 00000000000..b812d37ae8d --- /dev/null +++ b/arch/arm/src/am335x/am335x_sysclk.c @@ -0,0 +1,102 @@ +/**************************************************************************** + * arch/arm/src/am335x/am335x_sysclk.c + * + * Copyright (C) 2019 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include + +#include +#include + +#include "up_arch.h" +#include "hardware/am335x_memorymap.h" +#include "am335x_sysclk.h" + +/**************************************************************************** + * Pre-processor definitions + ****************************************************************************/ + +/* REVISIT: These belong in a control module register header file */ + +#define AM335X_SCM_CTRL_STATUS_OFFSET 0x40 +#define AM335X_SCM_CTRL_STATUS (AM335X_CONTROL_MODULE_VADDR + AM335X_SCM_CTRL_STATUS_OFFSET) +#define SCM_CTRL_STATUS_SYSBOOT1_SHIFT (22) /* Bits 22-23: Crystal clock frequency selection */ +#define SCM_CTRL_STATUS_SYSBOOT1_MASK (3 << SCM_CTRL_STATUS_SYSBOOT1_SHIFT) +# define SCM_CTRL_STATUS_SYSBOOT1_19p2MHZ (0 << SCM_CTRL_STATUS_SYSBOOT1_SHIFT) +# define SCM_CTRL_STATUS_SYSBOOT1_24MHZ (1 << SCM_CTRL_STATUS_SYSBOOT1_SHIFT) +# define SCM_CTRL_STATUS_SYSBOOT1_25MHZ (2 << SCM_CTRL_STATUS_SYSBOOT1_SHIFT) +# define SCM_CTRL_STATUS_SYSBOOT1_26MHZ (3 << SCM_CTRL_STATUS_SYSBOOT1_SHIFT) + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: am335x_get_sysclk + * + * Description: + * Return the sysclk frequency + * + ****************************************************************************/ + +int32_t am335x_get_sysclk(void) +{ + uint32_t regval; + + /* Read the input clock freq from the control module. */ + + regval = getreg32(AM335X_SCM_CTRL_STATUS); + + /* Return the frequency of the configured crystal */ + + switch (regval & SCM_CTRL_STATUS_SYSBOOT1_MASK) + { + case SCM_CTRL_STATUS_SYSBOOT1_19p2MHZ: /* 19.2Mhz */ + return 19200000; + + case SCM_CTRL_STATUS_SYSBOOT1_24MHZ: /* 24Mhz */ + return 24000000; + + case SCM_CTRL_STATUS_SYSBOOT1_25MHZ: /* 25Mhz */ + return 25000000; + + case SCM_CTRL_STATUS_SYSBOOT1_26MHZ: /* 26Mhz */ + return 26000000; + } + + return -EINVAL; /* Should never happen */ +} diff --git a/arch/arm/src/am335x/am335x_sysclk.h b/arch/arm/src/am335x/am335x_sysclk.h new file mode 100644 index 00000000000..15669c50b0f --- /dev/null +++ b/arch/arm/src/am335x/am335x_sysclk.h @@ -0,0 +1,59 @@ +/**************************************************************************** + * arch/arm/src/am335x/am335x_sysclk.h + * + * Copyright (C) 2019 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +#ifndef __ARCH_ARM_SRC_AM335X_AM335X_SYSCLK_H +#define __ARCH_ARM_SRC_AM335X_AM335X_SYSCLK_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Name: am335x_get_sysclk + * + * Description: + * Return the sysclk frequency + * + ****************************************************************************/ + +int32_t am335x_get_sysclk(void); + +#endif /* __ARCH_ARM_SRC_AM335X_AM335X_SYSCLK_H */