/* irq_init.c
*
* This file contains the implementation of rtems initialization
* related to interrupt handling.
*
* CopyRight (C) 1999 valette@crf.canon.fr
*
* Enhanced by Jay Kulpinski <jskulpin@eng01.gdds.com>
* to make it valid for MVME2300 Motorola boards.
*
* Till Straumann <strauman@slac.stanford.edu>, 12/20/2001:
* Use the new interface to openpic_init
*
* Adapted for the mvme3100 BSP by T. Straumann, 2007.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <libcpu/io.h>
#include <bsp/pci.h>
#include <bsp/openpic.h>
#include <bsp/irq.h>
#include <bsp.h>
#include <bsp/vectors.h>
#include <rtems/bspIo.h>
static void nop_func(void *unused)
{
printk("Unhandled IRQ\n");
}
static rtems_irq_connect_data rtemsIrq[BSP_IRQ_NUMBER];
static rtems_irq_global_settings initial_config;
static rtems_irq_connect_data defaultIrq = {
/* vectorIdex, hdl , handle , on , off , isOn */
0, nop_func , NULL , 0 , 0 , 0
};
static rtems_irq_prio irqPrioTable[BSP_IRQ_NUMBER]={
/*
* actual priorities for interrupt :
* 0 means that only current interrupt is masked
* 255 means all other interrupts are masked
*/
/*
* PCI Interrupts
*/
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, /* for raven prio 0 means unactive... */
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, /* for raven prio 0 means unactive... */
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, /* for raven prio 0 means unactive... */
/*
* Processor exceptions handled as interrupts
*/
0
};
/*
* This code assumes the exceptions management setup has already
* been done. We just need to replace the exceptions that will
* be handled like interrupt. On mcp750/mpc750 and many PPC processors
* this means the decrementer exception and the external exception.
*/
void BSP_rtems_irq_mng_init(unsigned cpuId)
{
/* We should really have a way to find the number of sources
* the driver will use so that the size of the polarity-array
* matches the driver's idea of it.
*/
unsigned char pol[56];
int i;
/* Note: The openpic driver initializes only as many
* 'pic-external' interrupt sources as reported
* by the feature register.
* The 8540's openpic supports 12 core-external
* and 23 core-internal (both of these groups
* are external to the PIC, i.e., 'pic-external')
* interrupts but between the corresponding
* banks of vector/priority registers there is
* a gap leaving space for 4 (unsupported) irqs.
* The driver, not knowing of this gap, would
* initialize the 12 core-external sources
* followed by 4 unsupported sources and 19
* core-internal sources thus leaving the last
* four core-internal sources uninitialized.
* Luckily, the feature register reports
* too many sources:
* - the 4 IPI plus 4 timer plus 4 messaging
* sources are included with the count
* - there are unused core-internal sources 24..32
* which are also supported by the pic
* bringing the reported number of sources to
* a count of 56 (12+32+4+4+4) which is enough
* so that all pic-external sources are covered
* and initialized.
*
* NOTE: All core-internal sources are active-high.
* The manual says that setting the polarity
* to 'low/0' will disable the interrupt but
* I found this not to be true: on the device
* I tested the interrupt was asserted hard.
*/
/* core-external sources on the mvme3100 are active-low,
* core-internal sources are active high.
*/
for (i=0; i<BSP_EXT_IRQ_NUMBER; i++)
pol[i]=0;
for (i=BSP_EXT_IRQ_NUMBER; i< BSP_EXT_IRQ_NUMBER + BSP_CORE_IRQ_NUMBER; i++)
pol[i]=1;
openpic_init(1, pol, 0, 0, 0, 0);
/*
* re-init the rtemsIrq table
*/
for (i = 0; i < BSP_IRQ_NUMBER; i++) {
rtemsIrq[i] = defaultIrq;
rtemsIrq[i].name = i;
}
/*
* Init initial Interrupt management config
*/
initial_config.irqNb = BSP_IRQ_NUMBER;
initial_config.defaultEntry = defaultIrq;
initial_config.irqHdlTbl = rtemsIrq;
initial_config.irqBase = BSP_LOWEST_OFFSET;
initial_config.irqPrioTbl = irqPrioTable;
if (!BSP_rtems_irq_mngt_set(&initial_config)) {
/*
* put something here that will show the failure...
*/
BSP_panic("Unable to initialize RTEMS interrupt Management!!! System locked\n");
}
}
