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nuttx/arch/arm/src/a1x/a1x_pio.c

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/****************************************************************************
* arch/arm/src/a1x/a1x_pio.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 <stdint.h>
#include <time.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <arch/board/board.h>
#include "up_internal.h"
#include "up_arch.h"
#include "chip.h"
#include "a1x_pio.h"
#include "chip/a1x_pio.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: a1x_pio_pin
*
* Description:
* Return the port number
*
****************************************************************************/
static inline int a1x_pio_port(pio_pinset_t cfgset)
{
return ((cfgset & PIO_PORT_MASK) >> PIO_PORT_SHIFT);
}
/****************************************************************************
* Name: a1x_pio_pin
*
* Description:
* Return the pin bit position
*
****************************************************************************/
static inline int a1x_pio_pin(pio_pinset_t cfgset)
{
return 1 << ((cfgset & PIO_PIN_MASK) >> PIO_PIN_SHIFT);
}
/****************************************************************************
* Name: a1x_pio_interrupt
*
* Description:
* Initialize logic to support a second level of interrupt decoding for
* PIO pins.
*
****************************************************************************/
#ifdef CONFIG_A1X_PIO_IRQ
static int a1x_pio_interrupt(int irq, void *context)
{
uint32_t status;
uint32_t mask;
uint32_t pending;
int irq;
/* Read the set of pending GPIO interrupts */
status = getreg32(A1X_PIO_INT_STA);
mask = getreg32(A1X_PIO_INT_CTL);
pending = status & mask;
/* Re-dispatch all pending GPIO interrupts */
for (irq = A1X_PIO_EINT0; pending != 0 && irq <= A1X_PIO_EINT31; irq++)
{
/* Check for pending interrupts in any of the lower 16-bits */
if ((pending & 0x0000ffff) == 0)
{
irq += 16;
pending >>= 16;
}
/* Check for pending interrupts in any of the lower 16-bits */
else if ((pending & 0x000000ff) == 0)
{
irq += 8;
pending >>= 8;
}
/* Check for pending interrupts in any of the lower 4-bits */
else if ((pending & 0x0000000f) == 0)
{
irq += 4;
pending >>= 4;
}
/* Check for pending interrupts in any of the lower 2-bits */
else if ((pending & 0x00000003) == 0)
{
irq += 2;
pending >>= 2;
}
/* Check for pending interrupts in any of the last bits */
else
{
if ((pending & 0x00000001) == 0)
{
/* Yes.. dispatch the interrupt */
(void)arm_doirq(irq, regs);
}
irq++;
pending >>= 1;
}
}
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: a1x_pio_irqinitialize
*
* Description:
* Initialize logic to support a second level of interrupt decoding for
* PIO pins.
*
****************************************************************************/
#ifdef CONFIG_A1X_PIO_IRQ
void a1x_pio_irqinitialize(void)
{
int ret;
/* Disable all external PIO interrupts */
putreg32(0, A1X_PIO_INT_CTL);
/* Attach the PIO interrupt handler */
ret = irq_attach(A1X_IRQ_PIO)
if (ret < 0)
{
return ret;
}
/* And enable the PIO interrupt */
up_enable_irq(A1X_IRQ_PIO);
}
#endif
/****************************************************************************
* Name: a1x_pio_config
*
* Description:
* Configure a PIO pin based on bit-encoded description of the pin.
*
****************************************************************************/
int a1x_pio_config(pio_pinset_t cfgset)
{
unsigned int port = a1x_pio_port(cfgset);
unsigned int pin = a1x_pio_pin(cfgset);
unsigned int shift;
unsigned int value;
uintptr_t cfgaddr;
uintptr_t puaddr;
uintptr_t drvaddr;
uintptr_t intaddr;
uintptr_t dataddr;
uint32_t regval;
irqstate_t flags;
/* Disable interrupts to prohibit re-entrance. */
flags = enter_critical_section();
/* Set the peripheral ID (0=input, 1=output) and interrupt mode */
switch (pin >> 3)
{
case 0: /* PIO 0-7 */
cfgaddr = A1X_PIO_CFG0(port);
intaddr = A1X_PIO_INT_CFG0;
break;
case 1: /* PIO 8-15 */
cfgaddr = A1X_PIO_CFG1(port);
intaddr = A1X_PIO_INT_CFG1;
break;
case 2: /* PIO 16-23 */
cfgaddr = A1X_PIO_CFG2(port);
intaddr = A1X_PIO_INT_CFG2;
break;
case 3: /* PIO 24-31 */
cfgaddr = A1X_PIO_CFG3(port);
intaddr = A1X_PIO_INT_CFG3;
break;
default:
return -EINVAL;
}
value = (cfgset & PIO_MODE_MASK) >> PIO_MODE_SHIFT;
shift = (port & 7) << 4;
regval = getreg32(cfgaddr);
regval &= ~(7 << shift);
regval |= (value << shift);
putreg32(regval, cfgaddr);
/* Do not modify the INT MASK unless this pin is configured
* as an external PIO interrupt.
*/
if ((cfgset & PIO_EINT_MASK) == PIO_EINT)
{
value = (cfgset & PIO_INT_MASK) >> PIO_INT_SHIFT;
regval = getreg32(intaddr);
regval &= ~(7 << shift);
regval |= (value << shift);
putreg32(regval, intaddr);
}
/* Set the pull-up/down and drive strength */
switch (pin >> 4)
{
case 0: /* PIO 0-15 */
puaddr = A1X_PIO_PUL0(port);
drvaddr = A1X_PIO_DRV0(port);
break;
case 1: /* PIO 16-31 */
puaddr = A1X_PIO_PUL1(port);
drvaddr = A1X_PIO_DRV1(port);
break;
default:
return -EINVAL;
}
value = (cfgset & PIO_PULL_MASK) >> PIO_PULL_SHIFT;
shift = (port & 15) << 2;
regval = getreg32(puaddr);
regval &= ~(3 << shift);
regval |= (value << shift);
putreg32(regval, puaddr);
value = (cfgset & PIO_DRIVE_MASK) >> PIO_DRIVE_SHIFT;
regval = getreg32(drvaddr);
regval &= ~(3 << shift);
regval |= (value << shift);
putreg32(regval, drvaddr);
/* Set the output value (will have no effect on inputs) */
dataddr = A1X_PIO_DAT(port);
regval = getreg32(dataddr);
if ((cfgset & PIO_OUTPUT_SET) != 0)
{
regval |= PIO_DAT(pin);
}
else
{
regval &= ~PIO_DAT(pin);
}
putreg32(regval, dataddr);
leave_critical_section(flags);
return OK;
}
/****************************************************************************
* Name: a1x_piowrite
*
* Description:
* Write one or zero to the selected PIO pin
*
****************************************************************************/
void a1x_pio_write(pio_pinset_t pinset, bool value)
{
unsigned int port = a1x_pio_port(pinset);
unsigned int pin = a1x_pio_pin(pinset);
irqstate_t flags;
uintptr_t regaddr;
uint32_t regval;
/* Disable interrupts to prohibit re-entrance. */
flags = enter_critical_section();
/* Set the output value (will have no effect on inputs */
regaddr = A1X_PIO_DAT(port);
regval = getreg32(regaddr);
if (value)
{
regval |= PIO_DAT(pin);
}
else
{
regval &= ~PIO_DAT(pin);
}
putreg32(regval, regaddr);
leave_critical_section(flags);
}
/****************************************************************************
* Name: a1x_pio_read
*
* Description:
* Read one or zero from the selected PIO pin
*
****************************************************************************/
bool a1x_pio_read(pio_pinset_t pinset)
{
unsigned int port = a1x_pio_port(pinset);
unsigned int pin = a1x_pio_pin(pinset);
uintptr_t regaddr;
uint32_t regval;
/* Get the input value */
regaddr = A1X_PIO_DAT(port);
regval = getreg32(regaddr);
return ((regval & PIO_DAT(pin)) != 0);
}
/************************************************************************************
* Name: a1x_pio_irqenable
*
* Description:
* Enable the interrupt for specified PIO IRQ
*
************************************************************************************/
#ifdef CONFIG_A1X_PIO_IRQ
void a1x_pio_irqenable(int irq)
{
irqstate_t flags;
uint32_t regval;
int pin;
if (irq >= A1X_PIO_EINT0 && irq <= A1X_PIO_EINT31)
{
/* Convert the IRQ number to a bit position */
pin = irq - A1X_PIO_EINT0
/* Un-mask the interrupt be setting the corresponding bit in the PIO INT CTL
* register.
*/
flags = enter_critical_section();
regval = getreg32(A1X_PIO_INT_CTL);
regval |= PIO_INT_CTL(irq);
leave_critical_section(flags);
}
}
#endif
/************************************************************************************
* Name: a1x_pio_irqdisable
*
* Description:
* Disable the interrupt for specified PIO IRQ
*
************************************************************************************/
#ifdef CONFIG_A1X_PIO_IRQ
void a1x_pio_irqdisable(int irq)
{
irqstate_t flags;
uint32_t regval;
int pin;
if (irq >= A1X_PIO_EINT0 && irq <= A1X_PIO_EINT31)
{
/* Convert the IRQ number to a bit position */
pin = irq - A1X_PIO_EINT0
/* Mask the interrupt be clearning the corresponding bit in the PIO INT CTL
* register.
*/
flags = enter_critical_section();
regval = getreg32(A1X_PIO_INT_CTL);
regval &= ~PIO_INT_CTL(irq);
leave_critical_section(flags);
}
}
#endif
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