SAMA5 ISI: Framework for ISI drivers. Not much there on initial check-in

arch/arm/src/sama5/sam_isi.c

+/****************************************************************************
+ * arch/arm/src/sama5/sam_isi.c
+ *
+ *   Copyright (C) 2013 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 "sam_pio.h"
+#include "sam_pck.h"
+#include "sam_isi.h"
+
+#ifdef CONFIG_SAMA5_ISI
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* The sensor master clock (ISI_MCK) is generated by the Advanced Power
+ * Management Controller (APMC) through a Programmable Clock output.
+ */
+
+#ifndef CONFIG_ISI_MCKFREQ
+#  error "CONFIG_ISI_MCKFREQ must be defined"
+#endif
+
+#if defined(CONFIG_ISI_PCK0)
+#  define ISI_PCKID PCK0
+#elif defined(CONFIG_ISI_PCK1)
+#  define ISI_PCKID PCK1
+#elif defined(CONFIG_ISI_PCK2)
+#  define ISI_PCKID PCK2
+#else
+#  error "No valid PCK selection"
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+/* This structure defines the overall state of the ISI interface */
+
+struct sam_isi_s
+{
+  uint32_t actual;  /* Acutal ISI_MCK frequency */
+};
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* ISI interface state */
+
+static struct sam_isi_s g_isi;
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sam_isi_initialize
+ *
+ * Description:
+ *   Initialize the ISI driver.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   OK on success; Negated errno on failure.
+ *
+ * Assumptions:
+ *   Called very early in the initialization sequence.
+ *
+ ****************************************************************************/
+
+int sam_isi_initialize(void)
+{
+  int ret;
+
+  /* Configure PIO pins for the ISI (outputs) */
+  /* Data pins */
+
+  (void)sam_configpio(PIO_ISI_D0);
+  (void)sam_configpio(PIO_ISI_D1);
+  (void)sam_configpio(PIO_ISI_D2);
+  (void)sam_configpio(PIO_ISI_D3);
+  (void)sam_configpio(PIO_ISI_D4);
+  (void)sam_configpio(PIO_ISI_D5);
+  (void)sam_configpio(PIO_ISI_D6);
+  (void)sam_configpio(PIO_ISI_D7);
+  (void)sam_configpio(PIO_ISI_D8);
+  (void)sam_configpio(PIO_ISI_D9);
+  (void)sam_configpio(PIO_ISI_D10);
+  (void)sam_configpio(PIO_ISI_D11);
+
+  /* Horizontal and vertical sync pins (inputs) */
+
+  (void)sam_configpio(PIO_ISI_HSYNC);
+  (void)sam_configpio(PIO_ISI_VSYNC);
+
+  /* Pixel clock input (ISI_PCK, not to be confused with the processor clock
+   * (PCK) or the programmable clock (PCK).
+   *
+   * NOTE: "Several parts of the ISI controller use the pixel clock provided
+   * by the image sensor (ISI_PCK). Thus the user must first program the
+   * image sensor to provide this clock (ISI_PCK) before programming the
+   * Image Sensor Controller."
+   */
+
+  (void)sam_configpio(PIO_ISI_PCK);
+
+  /* Configure ISI_MCK programmable clock output.
+   *
+   * REVISIT:  Might this not be needed before the image sensor is
+   * initialized?
+   */
+
+  g_isi.actual = sam_pck_configure(ISI_PCKID, CONFIG_ISI_MCKFREQ);
+  gvdbg("PCK%d frequency=%d actual=%d\n",
+        ISI_PCKID, CONFIG_ISI_MCKFREQ, g_isi.actual);
+
+  /* Enable the MCK (output) */
+
+  sam_pck_enable(ISI_PCKID, true);
+
+  /* Configure the pixel clock */
+#warning Missing logic
+
+  /* Configure color */
+#warning Missing logic
+
+}
+
+#endif /* CONFIG_SAMA5_ISI && CONFIG_SAMA5_EMAC */

arch/arm/src/sama5/sam_isi.h

+/************************************************************************************
+ * arch/arm/src/sama5/sam_isi.h
+ *
+ *   Copyright (C) 2013 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_ISI_H
+#define __ARCH_ARM_SRC_SAMA5_SAM_ISI_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+#include "chip/sam_isi.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Function: sam_isi_initialize
+ *
+ * Description:
+ *   Initialize the ISI driver.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   OK on success; Negated errno on failure.
+ *
+ * Assumptions:
+ *   Called very early in the initialization sequence.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SAMA5_ISI
+int sam_isi_initialize(void);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_ARM_SRC_SAMA5_SAM_ISI_H */