SAMA5: Add slow clock support

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
 

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 */

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);
+}

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 */

configs/sama5d3-xplained/include/board.h

@@ -52,6 +52,11 @@
  * definitions will configure operational clocking.
  */
 
+/* On-board crystal frequencies */
+
+#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
+#define BOARD_SLOWCLK_FREQUENCY    (32768)     /* Slow Clock: 32.768KHz */
+
 #if defined(CONFIG_SAMA5_BOOT_SDRAM)
 /* When booting from SDRAM, NuttX is loaded in SDRAM by an intermediate bootloader.
  * That bootloader had to have already configured the PLL and SDRAM for proper

configs/sama5d3-xplained/include/board_384mhz.h

@@ -161,7 +161,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #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 */

configs/sama5d3-xplained/include/board_396mhz.h

@@ -119,7 +119,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #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 */

configs/sama5d3-xplained/include/board_528mhz.h

@@ -118,7 +118,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #define BOARD_PLLA_FREQUENCY       (528000000) /* PLLACK:  44 * 12Mhz / 1 */
 #define BOARD_PCK_FREQUENCY        (528000000) /* CPU:     PLLACK / 1 / 1  */
 #define BOARD_MCK_FREQUENCY        (132000000) /* MCK:     PLLACK / 1 / 1 / 4 */

configs/sama5d3-xplained/include/board_sdram.h

@@ -57,7 +57,6 @@
  * the Main clock source in the on-board 12MHz crystal.
  */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #define BOARD_PLLA_FREQUENCY       (sam_pllack_frequency(BOARD_MAINOSC_FREQUENCY))
 #define BOARD_PLLADIV2_FREQUENCY   (sam_plladiv2_frequency(BOARD_MAINOSC_FREQUENCY))
 #define BOARD_PCK_FREQUENCY        (sam_pck_frequency(BOARD_MAINOSC_FREQUENCY))

configs/sama5d3x-ek/include/board.h

@@ -52,6 +52,11 @@
  * definitions will configure operational clocking.
  */
 
+/* On-board crystal frequencies */
+
+#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
+#define BOARD_SLOWCLK_FREQUENCY    (32768)     /* Slow Clock: 32.768KHz */
+
 #if defined(CONFIG_SAMA5_BOOT_SDRAM)
 /* When booting from SDRAM, NuttX is loaded in SDRAM by an intermediate bootloader.
  * That bootloader had to have already configured the PLL and SDRAM for proper

configs/sama5d3x-ek/include/board_384mhz.h

@@ -161,7 +161,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #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 */

configs/sama5d3x-ek/include/board_396mhz.h

@@ -119,7 +119,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #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 */

configs/sama5d3x-ek/include/board_528mhz.h

@@ -118,7 +118,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #define BOARD_PLLA_FREQUENCY       (528000000) /* PLLACK:  44 * 12Mhz / 1 */
 #define BOARD_PCK_FREQUENCY        (528000000) /* CPU:     PLLACK / 1 / 1  */
 #define BOARD_MCK_FREQUENCY        (132000000) /* MCK:     PLLACK / 1 / 1 / 4 */

configs/sama5d3x-ek/include/board_sdram.h

@@ -57,7 +57,6 @@
  * the Main clock source in the on-board 12MHz crystal.
  */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #define BOARD_PLLA_FREQUENCY       (sam_pllack_frequency(BOARD_MAINOSC_FREQUENCY))
 #define BOARD_PLLADIV2_FREQUENCY   (sam_plladiv2_frequency(BOARD_MAINOSC_FREQUENCY))
 #define BOARD_PCK_FREQUENCY        (sam_pck_frequency(BOARD_MAINOSC_FREQUENCY))

configs/sama5d4-ek/README.txt

@@ -2754,7 +2754,8 @@ Audio Support
       CONFIG_SAMA5_SSC_MAXINFLIGHT=16       : Up to 16 pending DMA transfers
       CONFIG_SAMA5_SSC0_MASTER=y            : Master mode
       CONFIG_SAMA5_SSC0_DATALEN=16          : 16-bit data
-      CONFIG_SAMA5_SSC0_RX=n                : No receiver
+      CONFIG_SAMA5_SSC0_RX=y                : Support a receiver
+      CONFIG_SAMA5_SSC0_RX_RKINPUT=y        : Receiver gets clock from RK input
       CONFIG_SAMA5_SSC0_TX=y                : Support a transmitter
       CONFIG_SAMA5_SSC0_TX_MCKDIV=y         : Transmitter gets clock from MCK/2
       CONFIG_SAMA5_SSC0_MCKDIV_SAMPLERATE=48000 : Sampling at 48K samples/sec

configs/sama5d4-ek/include/board.h

@@ -52,6 +52,11 @@
  * definitions will configure operational clocking.
  */
 
+/* On-board crystal frequencies */
+
+#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
+#define BOARD_SLOWCLK_FREQUENCY    (32768)     /* Slow Clock: 32.768KHz */
+
 #if defined(CONFIG_SAMA5_BOOT_SDRAM)
 /* When booting from SDRAM, NuttX is loaded in SDRAM by an intermediate bootloader.
  * That bootloader had to have already configured the PLL and SDRAM for proper

configs/sama5d4-ek/include/board_384mhz.h

@@ -159,7 +159,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #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 */

configs/sama5d4-ek/include/board_396mhz.h

@@ -117,7 +117,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #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 */

configs/sama5d4-ek/include/board_528mhz.h

@@ -116,7 +116,6 @@
 
 /* Resulting frequencies */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #define BOARD_PLLA_FREQUENCY       (528000000) /* PLLACK:  44 * 12Mhz / 1 */
 #define BOARD_PCK_FREQUENCY        (528000000) /* CPU:     PLLACK / 1 / 1  */
 #define BOARD_MCK_FREQUENCY        (132000000) /* MCK:     PLLACK / 1 / 1 / 4 */

configs/sama5d4-ek/include/board_sdram.h

@@ -57,7 +57,6 @@
  * the Main clock source in the on-board 12MHz crystal.
  */
 
-#define BOARD_MAINOSC_FREQUENCY    (12000000)  /* MAINOSC: 12MHz crystal on-board */
 #define BOARD_PLLA_FREQUENCY       (sam_pllack_frequency(BOARD_MAINOSC_FREQUENCY))
 #define BOARD_PLLADIV2_FREQUENCY   (sam_plladiv2_frequency(BOARD_MAINOSC_FREQUENCY))
 #define BOARD_PCK_FREQUENCY        (sam_pck_frequency(BOARD_MAINOSC_FREQUENCY))

configs/sama5d4-ek/src/sam_wm8904.c

@@ -49,10 +49,14 @@
 #include <nuttx/audio/i2s.h>
 #include <nuttx/audio/wm8904.h>
 
+#include <arch/board/board.h>
+
 #include "up_arch.h"
 #include "sam_pio.h"
 #include "sam_twi.h"
 #include "sam_ssc.h"
+#include "sam_sckc.h"
+#include "sam_pck.h"
 
 #include "sama5d4-ek.h"
 
@@ -270,6 +274,18 @@ int sam_wm8904_initialize(int minor)
           goto errout_with_i2s;
         }
 
+      /* Configure the DAC master clock.  This clock is provided by PCK0 (PB26)
+       * that is connected to the WM8904 BCLK/GPIO4 and also drives the SSC
+       * TK0 input clock.
+       */
+
+      sam_sckc_enable(true);
+      (void)sam_pck_configure(PCK0, BOARD_SLOWCLK_FREQUENCY);
+
+      /* Enable the DAC master clock */
+
+      sam_pck_enable(PCK0, true);
+
       /* Configure WM8904 interrupts */
 
       sam_pioirq(PIO_INT_WM8904);