1 files changed, 216 insertions, 0 deletions
diff --git a/drivers/mxc/security/sahara2/sah_interrupt_handler.c b/drivers/mxc/security/sahara2/sah_interrupt_handler.c
new file mode 100644
index 000000000000..959c3d8cf7bb
--- /dev/null
+++ b/drivers/mxc/security/sahara2/sah_interrupt_handler.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright (C) 2004-2010 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 sah_interrupt_handler.c
+*
+* @brief Provides a hardware interrupt handling mechanism for device driver.
+*
+* This file needs to be ported for a non-Linux OS.
+*
+* It gets a call at #sah_Intr_Init() during initialization.
+*
+* #sah_Intr_Top_Half() is intended to be the Interrupt Service Routine.  It
+* calls a portable function in another file to process the Sahara status.
+*
+* #sah_Intr_Bottom_Half() is a 'background' task scheduled by the top half to
+* take care of the expensive tasks of the interrupt processing.
+*
+* The driver shutdown code calls #sah_Intr_Release().
+*
+*/
+
+#include <portable_os.h>
+
+/* SAHARA Includes */
+#include <sah_kernel.h>
+#include <sah_interrupt_handler.h>
+#include <sah_status_manager.h>
+#include <sah_hardware_interface.h>
+#include <sah_queue_manager.h>
+
+/*Enable this flag for debugging*/
+#if 0
+#define DIAG_DRV_INTERRUPT
+#endif
+
+#ifdef DIAG_DRV_INTERRUPT
+#include <diagnostic.h>
+#endif
+
+/*!
+ * Number of interrupts received.  This value should only be updated during
+ * interrupt processing.
+ */
+uint32_t interrupt_count;
+
+#ifndef SAHARA_POLL_MODE
+
+#if !defined(LINUX_VERSION_CODE) || LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+#define irqreturn_t void
+#define IRQ_HANDLED
+#define IRQ_RETVAL(x)
+#endif
+
+/* Internal Prototypes */
+static irqreturn_t sah_Intr_Top_Half(int irq, void *dev_id);
+
+#ifdef KERNEL_TEST
+extern void (*SAHARA_INT_PTR) (int, void *);
+#endif
+
+unsigned long reset_flag;
+static void sah_Intr_Bottom_Half(unsigned long reset_flag);
+
+/* This is the Bottom Half Task, (reset flag set to false) */
+DECLARE_TASKLET(BH_task, sah_Intr_Bottom_Half, (unsigned long)&reset_flag);
+
+/*! This is set by the Initialisation function */
+wait_queue_head_t *int_queue = NULL;
+
+/*!
+*******************************************************************************
+* This function registers the Top Half of the interrupt handler with the Kernel
+* and the SAHARA IRQ number.
+*
+* @brief     SAHARA Interrupt Handler Initialisation
+*
+* @param    wait_queue Pointer to the wait queue used by driver interface
+*
+* @return   int A return of Zero indicates successful initialisation.
+*/
+/******************************************************************************
+*
+* CAUTION: NONE
+*
+* MODIFICATION HISTORY:
+*
+* Date         Person     Change
+* 30/07/2003   MW         Initial Creation
+******************************************************************************/
+int sah_Intr_Init(wait_queue_head_t * wait_queue)
+{
+
+#ifdef DIAG_DRV_INTERRUPT
+	char err_string[200];
+#endif
+
+	int result;
+
+#ifdef KERNEL_TEST
+	SAHARA_INT_PTR = sah_Intr_Top_Half;
+#endif
+
+	/* Set queue used by the interrupt handler to match the driver interface */
+	int_queue = wait_queue;
+
+	/* Request use of the Interrupt line. */
+	result = request_irq(SAHARA_IRQ,
+			     sah_Intr_Top_Half, 0, SAHARA_NAME, NULL);
+
+#ifdef DIAG_DRV_INTERRUPT
+	if (result != 0) {
+		sprintf(err_string, "Cannot use SAHARA interrupt line %d. "
+			"request_irq() return code is %i.", SAHARA_IRQ, result);
+		LOG_KDIAG(err_string);
+	} else {
+		sprintf(err_string,
+			"SAHARA driver registered for interrupt %d. ",
+			SAHARA_IRQ);
+		LOG_KDIAG(err_string);
+	}
+#endif
+
+	return result;
+}
+
+/*!
+*******************************************************************************
+* This function releases the Top Half of the interrupt handler. The driver will
+* not receive any more interrupts after calling this functions.
+*
+* @brief     SAHARA Interrupt Handler Release
+*
+* @return   void
+*/
+/******************************************************************************
+*
+* CAUTION: NONE
+*
+* MODIFICATION HISTORY:
+*
+* Date         Person     Change
+* 30/07/2003   MW         Initial Creation
+******************************************************************************/
+void sah_Intr_Release(void)
+{
+	/* Release the Interrupt. */
+	free_irq(SAHARA_IRQ, NULL);
+}
+
+/*!
+*******************************************************************************
+* This function is the Top Half of the interrupt handler.  It updates the
+* status of any finished descriptor chains and then tries to add any pending
+* requests into the hardware.  It then queues the bottom half to complete
+* operations on the finished chains.
+*
+* @brief     SAHARA Interrupt Handler Top Half
+*
+* @param    irq     Part of the kernel prototype.
+* @param    dev_id  Part of the kernel prototype.
+*
+* @return   An IRQ_RETVAL() -- non-zero to that function means 'handled'
+*/
+static irqreturn_t sah_Intr_Top_Half(int irq, void *dev_id)
+{
+#if defined(DIAG_DRV_INTERRUPT) && defined(DIAG_DURING_INTERRUPT)
+	LOG_KDIAG("Top half of Sahara's interrupt handler called.");
+#endif
+
+	interrupt_count++;
+	reset_flag = sah_Handle_Interrupt(sah_HW_Read_Status());
+
+	/* Schedule the Bottom Half of the Interrupt. */
+	tasklet_schedule(&BH_task);
+
+	/* To get rid of the unused parameter warnings. */
+	irq = 0;
+	dev_id = NULL;
+	return IRQ_RETVAL(1);
+}
+
+/*!
+*******************************************************************************
+* This function is the Bottom Half of the interrupt handler.  It calls
+* #sah_postprocess_queue() to complete the processing of the Descriptor Chains
+* which were finished by the hardware.
+*
+* @brief     SAHARA Interrupt Handler Bottom Half
+*
+* @param    data   Part of the kernel prototype.
+*
+* @return   void
+*/
+static void sah_Intr_Bottom_Half(unsigned long reset_flag)
+{
+#if defined(DIAG_DRV_INTERRUPT) && defined(DIAG_DURING_INTERRUPT)
+	LOG_KDIAG("Bottom half of Sahara's interrupt handler called.");
+#endif
+	sah_postprocess_queue(*(unsigned long *)reset_flag);
+
+	return;
+}
+
+/* end of sah_interrupt_handler.c */
+#endif				/* ifndef SAHARA_POLL_MODE */