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/********************************************************************************
* arch/arm/src/str71x/str71x_xti.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <stdint.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <arch/board/board.h>
#include "chip.h"
#include "up_arch.h"
#include "os_internal.h"
#include "up_internal.h"
#ifdef CONFIG_STR71X_XTI
/********************************************************************************
* Pre-procesor Definitions
********************************************************************************/
/********************************************************************************
* Private Types
********************************************************************************/
struct xtiregs_s
{
uint32_t mr; /* Mask register */
uint32_t tr; /* Trigger polarity register */
};
/********************************************************************************
* Public Data
********************************************************************************/
static const struct xtiregs_s g_xtiregs[2] =
{
{ STR71X_XTI_MRL, STR71X_XTI_TRL },
{ STR71X_XTI_MRH, STR71X_XTI_TRH }
};
/********************************************************************************
* Private Data
********************************************************************************/
/********************************************************************************
* Private Functions
********************************************************************************/
static int str7x_xtiinterrupt(int irq, FAR void *context)
{
uint16_t enabled = (uint16_t)getreg8(STR71X_XTI_MRH) << 8 |
(uint16_t)getreg8(STR71X_XTI_MRL);
uint16_t pending = (uint16_t)getreg8(STR71X_XTI_PRH) << 8 |
(uint16_t)getreg8(STR71X_XTI_PRL);
uint16_t mask;
/* Dispatch the interrupts, the actions performed by the interrupt
* handlers should clear the interrupt at the external source of the
* interrupt. We need to clear the interrupts at the source before
* clearing the pending interrupts (see below).
*/
pending &= enabled;
for (irq = STR71X_IRQ_FIRSTXTI, mask = 0x0001;
irq < NR_IRQS && pending != 0;
irq++, mask <<= 1)
{
/* Is this interrupt pending? */
if ((pending & mask) != 0)
{
/* Deliver the IRQ */
irq_dispatch(irq, context);
pending &= ~mask;
}
}
/* Clear the pending interrupts. This should be safe: "it is necessary to
* clear at least one pending bit: this operation allows a rising edge to be
* generated on the internal line (if there is at least one more pending bit
* set and not masked) and so to set the interrupt controller pending bit
* again.
*/
putreg8(0, STR71X_XTI_PRH);
putreg8(0, STR71X_XTI_PRL);
return OK;
}
/********************************************************************************
* Public Functions
********************************************************************************/
/********************************************************************************
* Name: str7x_xtiinitialize
*
* Description:
* Configure XTI for operation. Note that the lines are not used as wake-up
* sources in this implementation. Some extensions would be required for that
* capability.
*
********************************************************************************/
int str7x_xtiinitialize(void)
{
int ret;
/* Mask all interrupts by setting XTI MRH/L to zero */
putreg8(0, STR71X_XTI_MRH);
putreg8(0, STR71X_XTI_MRL);
/* Clear any pending interrupts by setting XTI PRH/L to zero */
putreg8(0, STR71X_XTI_PRH);
putreg8(0, STR71X_XTI_PRL);
/* Attach the XTI interrupt */
ret = irq_attach(STR71X_IRQ_XTI, str7x_xtiinterrupt);
if (ret == OK)
{
/* Enable the XTI interrupt at the XTI */
putreg8(STR71X_XTICTRL_ID1S, STR71X_XTI_CTRL);
/* And enable the XTI interrupt at the interrupt controller */
up_enable_irq(STR71X_IRQ_XTI);
}
return ret;
}
/********************************************************************************
* Name: str7x_xticonfig
*
* Description:
* Configure an external line to provide interrupts.
*
********************************************************************************/
int str7x_xticonfig(int irq, bool rising)
{
uint8_t regval;
int bit;
int ndx;
int ret = -EINVAL;
/* Configure one of the 16 lines as an interrupt source */
if (irq > STR71X_IRQ_FIRSTXTI && irq <= NR_IRQS)
{
/* Decide if we use the lower or upper regiser */
bit = irq - STR71X_IRQ_FIRSTXTI;
ndx = 0;
if (bit > 7)
{
/* Select the high register */
bit -= 8;
ndx = 1;
}
/* Set the rising or trailing edge */
regval = getreg8(g_xtiregs[ndx].tr);
if (rising)
{
regval |= (1 << bit);
}
else
{
regval &= ~(1 << bit);
}
putreg8(regval, g_xtiregs[ndx].tr);
/* Enable the interrupt be setting the corresponding mask bit
* the XTI_MRL/H register.
*/
regval = getreg8(g_xtiregs[ndx].mr);
regval |= (1 << bit);
putreg8(regval, g_xtiregs[ndx].mr);
/* Return success */
ret = OK;
}
return ret;
}
#endif /* CONFIG_STR71X_XTI */
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