1 files changed, 151 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/sdma/iapi/src/iapiLow.c b/arch/arm/plat-mxc/sdma/iapi/src/iapiLow.c
new file mode 100644
index 000000000000..47611fe52743
--- /dev/null
+++ b/arch/arm/plat-mxc/sdma/iapi/src/iapiLow.c
@@ -0,0 +1,151 @@
+/******************************************************************************
+ *
+ * Copyright 2007-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ ******************************************************************************
+ *
+ * File: iapiLow.c
+ *
+ * $Id iapiLow.c $
+ *
+ * Description:
+ *  This library is written in C to guarantee functionality and integrity in
+ * the usage of SDMA virtual DMA channels. This API (Application Programming
+ * Interface)  allow SDMA channels' access in an OPEN, READ, WRITE, CLOSE
+ * fashion.
+ *  These are the LOW level functions of the I.API.
+ *
+ *
+ * /
+ *
+ * $Log iapiLow.c $
+ *
+ *****************************************************************************/
+
+/* ****************************************************************************
+ * Include File Section
+ *****************************************************************************/
+#include <linux/preempt.h>
+#include <linux/hardirq.h>
+#include "epm.h"
+#include "iapiLow.h"
+
+/**
+ * Function Section
+ */
+
+/* ***************************************************************************/
+/**Records an ISR callback function pointer into the ISR callback
+ * function table
+ *
+ * @param cd_p channel descriptor to attach callback to
+ * @param func_p pointer to the callback function to be registered
+ *
+ * @return none
+ */
+void
+iapi_AttachCallbackISR(channelDescriptor *cd_p,
+		       void (*func_p) (channelDescriptor *cd_p, void *arg))
+{
+	if (cd_p->callbackSynch == CALLBACK_ISR) {
+		iapi_DisableInterrupts();
+		callbackIsrTable[cd_p->channelNumber] = func_p;
+		iapi_EnableInterrupts();
+	} else if (cd_p->callbackSynch == DEFAULT_POLL) {
+		callbackIsrTable[cd_p->channelNumber] = NULL;
+	} else {
+		iapi_errno =
+		    IAPI_ERR_CALLBACKSYNCH_UNKNOWN | IAPI_ERR_CH_AVAILABLE |
+		    cd_p->channelNumber;
+	}
+}
+
+/* ***************************************************************************/
+/**Detaches (removes) an ISR callback function pointer from the ISR callback
+ * function table
+ *
+ * <b>Algorithm:</b>\n
+ *    - Attach a null function to replace the original one.
+ *
+ * @param cd_p channel descriptor to detach callback from
+ *
+ * @return none
+ */
+void iapi_DetachCallbackISR(channelDescriptor *cd_p)
+{
+	iapi_AttachCallbackISR(cd_p, NULL);
+}
+
+/* ***************************************************************************/
+/**Updates an ISR callback function pointer into the ISR callback function
+ * table
+ *
+ * <b>Algorithm:</b>\n
+ *    - Detach the old function pointer (if any) and attach the new one
+ *
+ * @param cd_p channel descriptor to attach callback to
+ * @param func_p pointer to the callback function to be registered
+ *
+ * @return none
+ */
+void
+iapi_ChangeCallbackISR(channelDescriptor *cd_p,
+		       void (*func_p) (channelDescriptor *cd_p, void *arg))
+{
+	iapi_DetachCallbackISR(cd_p);
+	iapi_AttachCallbackISR(cd_p, func_p);
+}
+
+/* ***************************************************************************/
+/**Loop while the channel is not done on the SDMA
+ *
+ * <b>Algorithm:</b>\n
+ *    - Loop doing nothing but checking the I.API global variable to indicate
+ * that the channel has been completed (interrupt from SDMA)
+ *
+ * <b>Notes:</b>\n
+ *    - The ISR must update the I.API global variable iapi_SDMAIntr.
+ *
+ * @param channel channel number to poll on
+ *
+ * @return none
+ */
+void iapi_lowSynchChannel(unsigned char channel)
+{
+	if (preempt_count() || in_interrupt()) {
+		 while (!((1UL << channel) & iapi_SDMAIntr))
+			 ;
+	} else
+		GOTO_SLEEP(channel);
+
+	iapi_SDMAIntr &= ~(1UL << channel);
+}
+
+/* ***************************************************************************/
+/**Fill the buffer descriptor with the values given in parameter.
+ *
+ * @return none
+ */
+void
+iapi_SetBufferDescriptor(bufferDescriptor *bd_p, unsigned char command,
+			 unsigned char status, unsigned short count,
+			 void *buffAddr, void *extBufferAddr)
+{
+	bd_p->mode.command = command;
+	bd_p->mode.status = status;
+	bd_p->mode.count = count;
+	if (buffAddr != NULL) {
+		bd_p->bufferAddr = iapi_Virt2Phys(buffAddr);
+	} else {
+		bd_p->bufferAddr = buffAddr;
+	}
+	bd_p->extBufferAddr = extBufferAddr;
+}