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/* gpio.h -- GPIO code simulation
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Copyright (C) 2001 Erez Volk, erez@mailandnews.comopencores.org
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This file is part of OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "gpio.h"
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#include "gpio_i.h"
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#include "sim-config.h"
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#include "pic.h"
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#include "vapi.h"
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static struct gpio_device gpios[MAX_GPIOS];
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static void gpio_vapi_read( unsigned long id, unsigned long data );
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static unsigned long gpio_read32( unsigned long addr );
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static void gpio_write32( unsigned long addr, unsigned long value );
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static void gpio_external_clock( unsigned long value );
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static void gpio_device_clock( struct gpio_device *gpio );
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static int gpio_find_device( unsigned long addr, struct gpio_device **gpio, unsigned long *reladdr );
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static struct gpio_device *gpio_find_vapi_device( unsigned long id, unsigned *which_vapi );
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/* Initialize all parameters and state */
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void gpio_reset( void )
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{
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static int first_time = 1;
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unsigned i, j;
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if ( !config.ngpios )
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config.gpios_enabled = 0;
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if ( !config.gpios_enabled )
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return;
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if ( first_time ) {
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memset( gpios, 0, sizeof(gpios) );
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first_time = 0;
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}
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for ( i = 0; i < MAX_GPIOS; ++ i ) {
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struct gpio_device *gpio = &(gpios[i]);
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gpio->gpio_number = i;
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gpio->baseaddr = config.gpios[i].baseaddr;
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if ( gpio->baseaddr != 0 ) {
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/* Get IRQ */
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gpio->irq = config.gpios[i].irq;
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/* Register memory range */
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register_memoryarea( gpio->baseaddr, GPIO_ADDR_SPACE, 4, gpio_read32, gpio_write32 );
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/* Possibly connect to VAPI */
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gpio->vapi_ids[GPIO_VAPI_DATA] = config.gpios[i].vapi_id;
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gpio->vapi_ids[GPIO_VAPI_AUX] = config.gpios[i].aux_vapi_id;
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gpio->vapi_ids[GPIO_VAPI_CLOCK] = config.gpios[i].clk_vapi_id;
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gpio->vapi_ids[GPIO_VAPI_CONFIG] = config.gpios[i].cfg_vapi_id;
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for ( j = 0; j < GPIO_NUM_VAPI_IDS; ++ j )
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if ( gpio->vapi_ids[j] )
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vapi_install_handler( gpio->vapi_ids[j], gpio_vapi_read );
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}
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}
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}
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/* Dump status */
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void gpio_status( void )
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{
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unsigned i;
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for ( i = 0; i < MAX_GPIOS; ++ i ) {
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struct gpio_device *gpio = &(gpios[i]);
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if ( gpio->baseaddr == 0 )
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continue;
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printf( "\nGPIO %u at 0x%08X:\n", i, gpio->baseaddr );
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printf( "RGPIO_IN : 0x%08lX\n", gpio->curr.in );
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printf( "RGPIO_OUT : 0x%08lX\n", gpio->curr.out );
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printf( "RGPIO_OE : 0x%08lX\n", gpio->curr.oe );
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printf( "RGPIO_INTE : 0x%08lX\n", gpio->curr.inte );
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printf( "RGPIO_PTRIG : 0x%08lX\n", gpio->curr.ptrig );
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printf( "RGPIO_AUX : 0x%08lX\n", gpio->curr.aux );
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printf( "RGPIO_CTRL : 0x%08lX\n", gpio->curr.ctrl );
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}
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}
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/* Convert a memory address to a device struct and relative address.
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* Return nonzero on success */
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int gpio_find_device( unsigned long addr, struct gpio_device **gpio, unsigned long *reladdr )
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{
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unsigned i;
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*gpio = NULL;
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for ( i = 0; i < MAX_GPIOS && *gpio == NULL; ++ i ) {
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if ( (addr >= gpios[i].baseaddr) && (addr < gpios[i].baseaddr + GPIO_ADDR_SPACE) )
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*gpio = &(gpios[i]);
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}
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/* verify we found a device */
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if ( *gpio == NULL )
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return 0;
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/* Verify legal address */
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if ( (addr - (*gpio)->baseaddr) % 4 != 0 )
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return 0;
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*reladdr = addr - (*gpio)->baseaddr;
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return 1;
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}
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/* Find device by vapi id */
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struct gpio_device *gpio_find_vapi_device( unsigned long id, unsigned *which )
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{
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unsigned i, j;
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for ( i = 0; i < MAX_GPIOS; ++ i )
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for ( j = 0; j < GPIO_NUM_VAPI_IDS; ++ j )
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if ( id == gpios[i].vapi_ids[j] )
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return &(gpios[i]);
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return NULL;
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}
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/* Wishbone read */
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unsigned long gpio_read32( unsigned long addr )
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{
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struct gpio_device *gpio;
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if ( !gpio_find_device( addr, &gpio, &addr ) ) {
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printf( "gpio_read32( 0x%08lX ): Not in registered range(s)\n", addr );
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return 0;
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}
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switch( addr ) {
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case RGPIO_IN: gpio->next.ctrl &= ~RGPIO_CTRL_INT; return gpio->curr.in;
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case RGPIO_OUT: return gpio->curr.out;
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case RGPIO_OE: return gpio->curr.oe;
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case RGPIO_INTE: return gpio->curr.inte;
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case RGPIO_PTRIG: return gpio->curr.ptrig;
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case RGPIO_AUX: return gpio->curr.aux;
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case RGPIO_CTRL: return gpio->curr.ctrl;
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}
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}
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/* Wishbone write */
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void gpio_write32( unsigned long addr, unsigned long value )
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{
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struct gpio_device *gpio;
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if ( !gpio_find_device( addr, &gpio, &addr ) ) {
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printf( "gpio_write32( 0x%08lX ): Not in registered range(s)\n", addr );
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return;
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}
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switch( addr ) {
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case RGPIO_IN: debug( 3, "GPIO: Cannot write to RGPIO_IN\n" ); break;
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case RGPIO_OUT: gpio->next.out = value; break;
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case RGPIO_OE: gpio->next.oe = value; break;
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case RGPIO_INTE: gpio->next.inte = value; break;
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case RGPIO_PTRIG: gpio->next.ptrig = value; break;
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case RGPIO_AUX: gpio->next.aux = value; break;
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case RGPIO_CTRL: gpio->next.ctrl = value; break;
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}
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}
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/* Input from "outside world" */
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void gpio_vapi_read( unsigned long id, unsigned long data )
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{
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unsigned which;
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struct gpio_device *gpio = gpio_find_vapi_device( id, &which );
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debug( 4, "GPIO: id %08x, data %08x\n", id, data );
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if ( !gpio ) {
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debug( 1, "GPIO: VAPI ID %08x is not ours!\n", id );
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return;
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}
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switch( which ) {
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case GPIO_VAPI_DATA: gpio->next.in = data; break;
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case GPIO_VAPI_AUX: gpio->auxiliary_inputs = data; break;
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case GPIO_VAPI_CLOCK: gpio_external_clock( data ); break;
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case GPIO_VAPI_CONFIG: /* Currently no configuration commands supported */ break;
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}
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}
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/* System Clock. */
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void gpio_clock( void )
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{
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unsigned i;
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for ( i = 0; i < MAX_GPIOS; ++ i )
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if ( !(gpios[i].curr.ctrl & RGPIO_CTRL_ECLK) )
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gpio_device_clock( &(gpios[i]) );
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}
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/* External Clock. */
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void gpio_external_clock( unsigned long value )
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{
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unsigned i;
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value = (value != 0);
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for ( i = 0; i < MAX_GPIOS; ++ i ) {
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struct gpio_device *gpio = &(gpios[i]);
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int eclk = ((gpio->curr.ctrl & RGPIO_CTRL_ECLK) == RGPIO_CTRL_ECLK);
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int nec = ((gpio->curr.ctrl & RGPIO_CTRL_NEC) == RGPIO_CTRL_NEC);
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gpio->next.external_clock = value;
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if ( eclk && (gpio->next.external_clock != gpio->curr.external_clock) && (value != nec) )
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gpio_device_clock( gpio );
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}
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}
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/* Clock as handld by one device. */
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void gpio_device_clock( struct gpio_device *gpio )
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{
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/* If any outputs changed, notify the world (i.e. vapi) */
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gpio->next.out = ((gpio->next.out & ~gpio->next.aux) | (gpio->auxiliary_inputs & gpio->next.aux)) & gpio->next.oe;
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if ( gpio->next.out != gpio->curr.out )
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if ( gpio->vapi_ids[GPIO_VAPI_DATA] != 0 )
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vapi_send( gpio->vapi_ids[GPIO_VAPI_DATA], gpio->next.out );
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/* Check if any inputs changed */
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gpio->next.in &= ~gpio->next.oe;
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if ( (gpio->next.in != gpio->curr.in) && (gpio->next.ctrl & RGPIO_CTRL_INTE) ) {
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unsigned changed_bits = gpio->next.in ^ gpio->curr.in; /* inputs that have changed */
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unsigned set_bits = changed_bits & gpio->next.in; /* inputs that have been set */
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unsigned cleared_bits = changed_bits & gpio->curr.in; /* inputs that have been cleared */
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unsigned relevant_bits = (gpio->next.ptrig & set_bits) | (~gpio->next.ptrig & cleared_bits);
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if ( relevant_bits & gpio->next.inte ) {
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report_interrupt( gpio->irq );
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gpio->next.ctrl |= RGPIO_CTRL_INT;
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}
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}
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/* Switch to values for next clock */
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memcpy( &(gpio->curr), &(gpio->next), sizeof(gpio->curr) );
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}
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