SAMA5: Add slow clock support

4 files changed, 258 insertions, 1 deletions

diff --git a/nuttx/arch/arm/src/sama5/Make.defs b/nuttx/arch/arm/src/sama5/Make.defs
index 416a3a785..b6253c0ed 100644
--- a/nuttx/arch/arm/src/sama5/Make.defs
+++ b/nuttx/arch/arm/src/sama5/Make.defs
@@ -99,7 +99,7 @@ CHIP_ASRCS  =
 
 CHIP_CSRCS  = sam_allocateheap.c sam_boot.c sam_clockconfig.c sam_irq.c
 CHIP_CSRCS += sam_lowputc.c sam_memories.c sam_pck.c sam_pio.c sam_pmc.c
-CHIP_CSRCS += sam_serial.c sam_timerisr.c
+CHIP_CSRCS += sam_sckc.c sam_serial.c sam_timerisr.c
 
 # Configuration dependent C and assembly language files
 
diff --git a/nuttx/arch/arm/src/sama5/chip/sam_sckc.h b/nuttx/arch/arm/src/sama5/chip/sam_sckc.h
new file mode 100644
index 000000000..4cb70f9b8
--- /dev/null
+++ b/nuttx/arch/arm/src/sama5/chip/sam_sckc.h
@@ -0,0 +1,63 @@
+/************************************************************************************
+ * arch/arm/src/sama5/chip/sam_sckc.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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_SAMA5_CHIP_SAM_SCKC_H
+#define __ARCH_ARM_SRC_SAMA5_CHIP_SAM_SCKC_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+#include "chip/sam_memorymap.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/* SCKC Register Offsets ************************************************************/
+
+#define SAM_SCKC_CR_OFFSET    0x0000 /* Slow Clock Controller Configuration Register  */
+
+/* SCKC Register Addresses **********************************************************/
+
+#define SAM_SCKC_CR           (SAM_SCKCR_VBASE+SAM_SCKC_CR_OFFSET)
+
+/* SCKC Register Bit Definitions ****************************************************/
+
+/* Slow Clock Controller Configuration Register */
+
+#define SCKC_CR_OSCSEL        (1 << 3)  /* Bit 3:  Slow Clock Selector */
+
+#endif /* __ARCH_ARM_SRC_SAMA5_CHIP_SAM_SCKC_H */
diff --git a/nuttx/arch/arm/src/sama5/sam_sckc.c b/nuttx/arch/arm/src/sama5/sam_sckc.c
new file mode 100644
index 000000000..b0d1a05f5
--- /dev/null
+++ b/nuttx/arch/arm/src/sama5/sam_sckc.c
@@ -0,0 +1,103 @@
+/****************************************************************************
+ * arch/arm/src/sama5/sam_sckc.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <nuttx/config.h>
+
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/clock.h>
+
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "sam_sckc.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_sckc_enable
+ *
+ * Description:
+ *   Enable or disable the slow clock oscillator driver by an external
+ *   crystal.
+ *
+ * Input Parameters:
+ *   enable - True: enable the slow clock, False: disable the slow clock
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void sam_sckc_enable(bool enable)
+{
+  uint32_t regval;
+
+  /* Enable / disable the slow clock */
+
+  regval = enable ? SCKC_CR_OSCSEL : 0;
+  putreg32(regval, SAM_SCKC_CR);
+
+  /* Wait 5 slow clock cycles for internal resynchronization */
+
+  up_udelay(5 * USEC_PER_SEC / BOARD_SLOWCLK_FREQUENCY);
+}
diff --git a/nuttx/arch/arm/src/sama5/sam_sckc.h b/nuttx/arch/arm/src/sama5/sam_sckc.h
new file mode 100644
index 000000000..c4296c167
--- /dev/null
+++ b/nuttx/arch/arm/src/sama5/sam_sckc.h
@@ -0,0 +1,91 @@
+/****************************************************************************
+ * arch/arm/src/sama5/sam_sckc.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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_SAMA5_SAM_SCKC_H
+#define __ARCH_ARM_SRC_SAMA5_SAM_SCKC_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+
+#include "chip.h"
+#include "chip/sam_sckc.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_sckc_enable
+ *
+ * Description:
+ *   Enable or disable the slow clock oscillator driver by an external
+ *   crystal.
+ *
+ * Input Parameters:
+ *   enable - True: enable the slow clock, False: disable the slow clock
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void sam_sckc_enable(bool enable);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_ARM_SRC_SAMA5_SAM_SCKC_H */