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/*
*
* This file contains the i8259/openpic-specific implementation of
* the function described in irq.h
*
* Copyright (C) 1998, 1999 valette@crf.canon.fr
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <stdlib.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/irq_supp.h>
#ifndef BSP_HAS_NO_VME
#include <bsp/VMEConfig.h>
#endif
#if BSP_PCI_IRQ_NUMBER > 0
#include <bsp/openpic.h>
#endif
#include <libcpu/io.h>
#include <bsp/vectors.h>
#include <stdlib.h>
#include <rtems/bspIo.h> /* for printk */
#ifndef qemu
#define RAVEN_INTR_ACK_REG 0xfeff0030
#else
#define RAVEN_INTR_ACK_REG 0xbffffff0
#endif
#if BSP_ISA_IRQ_NUMBER > 0
/*
* pointer to the mask representing the additionnal irq vectors
* that must be disabled when a particular entry is activated.
* They will be dynamically computed from the priority table given
* in BSP_rtems_irq_mngt_set();
* CAUTION : this table is accessed directly by interrupt routine
* prologue.
*/
rtems_i8259_masks irq_mask_or_tbl[BSP_IRQ_NUMBER];
#endif
/*
* default handler connected on each irq after bsp initialization
*/
static rtems_irq_connect_data default_rtems_entry;
static rtems_irq_connect_data* rtems_hdl_tbl;
#if BSP_ISA_IRQ_NUMBER > 0
/*
* Check if IRQ is an ISA IRQ
*/
static inline int is_isa_irq(const rtems_irq_number irqLine)
{
return (((int) irqLine <= BSP_ISA_IRQ_MAX_OFFSET) &&
((int) irqLine >= BSP_ISA_IRQ_LOWEST_OFFSET)
);
}
#endif
#if BSP_PCI_IRQ_NUMBER > 0
/*
* Check if IRQ is an OPENPIC IRQ
*/
static inline int is_pci_irq(const rtems_irq_number irqLine)
{
return OpenPIC && (((int) irqLine <= BSP_PCI_IRQ_MAX_OFFSET) &&
((int) irqLine >= BSP_PCI_IRQ_LOWEST_OFFSET)
);
}
#endif
/*
* ------------------------ RTEMS Irq helper functions ----------------
*/
#if BSP_ISA_IRQ_NUMBER > 0
/*
* Caution : this function assumes the variable "*config"
* is already set and that the tables it contains are still valid
* and accessible.
*/
static void compute_i8259_masks_from_prio (rtems_irq_global_settings* config)
{
int i;
int j;
/*
* Always mask at least current interrupt to prevent re-entrance
*/
for (i=BSP_ISA_IRQ_LOWEST_OFFSET; i < BSP_ISA_IRQ_LOWEST_OFFSET + BSP_ISA_IRQ_NUMBER; i++) {
* ((unsigned short*) &irq_mask_or_tbl[i]) = (1 << i);
for (j = BSP_ISA_IRQ_LOWEST_OFFSET; j < BSP_ISA_IRQ_LOWEST_OFFSET + BSP_ISA_IRQ_NUMBER; j++) {
/*
* Mask interrupts at i8259 level that have a lower priority
*/
if (config->irqPrioTbl [i] > config->irqPrioTbl [j]) {
* ((unsigned short*) &irq_mask_or_tbl[i]) |= (1 << j);
}
}
}
}
#endif
void
BSP_enable_irq_at_pic(const rtems_irq_number name)
{
#if BSP_ISA_IRQ_NUMBER > 0
if (is_isa_irq(name)) {
/*
* Enable interrupt at PIC level
*/
BSP_irq_enable_at_i8259s ((int) name - BSP_ISA_IRQ_LOWEST_OFFSET);
}
#endif
#if BSP_PCI_IRQ_NUMBER > 0
if (is_pci_irq(name)) {
/*
* Enable interrupt at OPENPIC level
*/
openpic_enable_irq ((int) name - BSP_PCI_IRQ_LOWEST_OFFSET);
}
#endif
}
int
BSP_disable_irq_at_pic(const rtems_irq_number name)
{
#if BSP_ISA_IRQ_NUMBER > 0
if (is_isa_irq(name)) {
/*
* disable interrupt at PIC level
*/
return BSP_irq_disable_at_i8259s ((int) name - BSP_ISA_IRQ_LOWEST_OFFSET);
}
#endif
#if BSP_PCI_IRQ_NUMBER > 0
if (is_pci_irq(name)) {
/*
* disable interrupt at OPENPIC level
*/
return openpic_disable_irq ((int) name - BSP_PCI_IRQ_LOWEST_OFFSET);
}
#endif
return -1;
}
/*
* RTEMS Global Interrupt Handler Management Routines
*/
int BSP_setup_the_pic(rtems_irq_global_settings* config)
{
int i;
/*
* Store various code accelerators
*/
default_rtems_entry = config->defaultEntry;
rtems_hdl_tbl = config->irqHdlTbl;
/*
* set up internal tables used by rtems interrupt prologue
*/
#if BSP_ISA_IRQ_NUMBER > 0
/*
* start with ISA IRQ
*/
compute_i8259_masks_from_prio (config);
for (i=BSP_ISA_IRQ_LOWEST_OFFSET; i < BSP_ISA_IRQ_LOWEST_OFFSET + BSP_ISA_IRQ_NUMBER; i++) {
if (rtems_hdl_tbl[i].hdl != default_rtems_entry.hdl) {
BSP_irq_enable_at_i8259s (i);
}
else {
BSP_irq_disable_at_i8259s (i);
}
}
if ( BSP_ISA_IRQ_NUMBER > 0 ) {
/*
* must enable slave pic anyway
*/
BSP_irq_enable_at_i8259s (2);
}
#endif
#if BSP_PCI_IRQ_NUMBER > 0
if ( ! OpenPIC )
return 1;
/*
* continue with PCI IRQ
*/
for (i=BSP_PCI_IRQ_LOWEST_OFFSET; i < BSP_PCI_IRQ_LOWEST_OFFSET + BSP_PCI_IRQ_NUMBER ; i++) {
/*
* Note that openpic_set_priority() sets the TASK priority of the PIC
*/
openpic_set_source_priority(i - BSP_PCI_IRQ_LOWEST_OFFSET,
config->irqPrioTbl[i]);
if (rtems_hdl_tbl[i].hdl != default_rtems_entry.hdl) {
openpic_enable_irq ((int) i - BSP_PCI_IRQ_LOWEST_OFFSET);
}
else {
openpic_disable_irq ((int) i - BSP_PCI_IRQ_LOWEST_OFFSET);
}
}
#ifdef BSP_PCI_ISA_BRIDGE_IRQ
/*
* Must enable PCI/ISA bridge IRQ
*/
openpic_enable_irq (BSP_PCI_ISA_BRIDGE_IRQ);
#endif
#endif
return 1;
}
int _BSP_vme_bridge_irq = -1;
unsigned BSP_spuriousIntr = 0;
/*
* High level IRQ handler called from shared_raw_irq_code_entry
*/
int C_dispatch_irq_handler (BSP_Exception_frame *frame, unsigned int excNum)
{
register unsigned int irq;
#if BSP_ISA_IRQ_NUMBER > 0
register unsigned isaIntr; /* boolean */
register unsigned oldMask = 0; /* old isa pic masks */
register unsigned newMask; /* new isa pic masks */
#endif
if (excNum == ASM_DEC_VECTOR) {
bsp_irq_dispatch_list(rtems_hdl_tbl, BSP_DECREMENTER, default_rtems_entry.hdl);
return 0;
}
#if BSP_PCI_IRQ_NUMBER > 0
if ( OpenPIC ) {
irq = openpic_irq(0);
if (irq == OPENPIC_VEC_SPURIOUS) {
++BSP_spuriousIntr;
return 0;
}
/* some BSPs might want to use a different numbering... */
irq = irq - OPENPIC_VEC_SOURCE + BSP_PCI_IRQ_LOWEST_OFFSET;
} else {
#if BSP_ISA_IRQ_NUMBER > 0
#ifdef BSP_PCI_ISA_BRIDGE_IRQ
irq = BSP_PCI_ISA_BRIDGE_IRQ;
#else
#error "Configuration Error -- BSP with ISA + PCI IRQs MUST define BSP_PCI_ISA_BRIDGE_IRQ"
#endif
#else
BSP_panic("MUST have an OpenPIC if BSP has PCI IRQs but no ISA IRQs");
/* BSP_panic() never returns but the 'return' statement silences
* a compiler warning about 'irq' possibly being used w/o initialization.
*/
return -1;
#endif
}
#endif
#if BSP_ISA_IRQ_NUMBER > 0
#ifdef BSP_PCI_ISA_BRIDGE_IRQ
#if 0 == BSP_PCI_IRQ_NUMBER
#error "Configuration Error -- BSP w/o PCI IRQs MUST NOT define BSP_PCI_ISA_BRIDGE_IRQ"
#endif
isaIntr = (irq == BSP_PCI_ISA_BRIDGE_IRQ);
#else
isaIntr = 1;
#endif
if (isaIntr) {
/*
* Acknowledge and read 8259 vector
*/
irq = (unsigned int) (*(unsigned char *) RAVEN_INTR_ACK_REG);
/*
* store current PIC mask
*/
oldMask = i8259s_cache;
newMask = oldMask | irq_mask_or_tbl [irq];
i8259s_cache = newMask;
outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff);
outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8));
BSP_irq_ack_at_i8259s (irq);
#if BSP_PCI_IRQ_NUMBER > 0
if ( OpenPIC )
openpic_eoi(0);
#endif
}
#endif
/* dispatch handlers */
bsp_irq_dispatch_list(rtems_hdl_tbl, irq, default_rtems_entry.hdl);
#if BSP_ISA_IRQ_NUMBER > 0
if (isaIntr) {
i8259s_cache = oldMask;
outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff);
outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8));
}
else
#endif
{
#if BSP_PCI_IRQ_NUMBER > 0
#ifdef BSP_PCI_VME_DRIVER_DOES_EOI
/* leave it to the VME bridge driver to do EOI, so
* it can re-enable the openpic while handling
* VME interrupts (-> VME priorities in software)
*/
if (_BSP_vme_bridge_irq != irq && OpenPIC)
#endif
openpic_eoi(0);
#else
do {} while (0);
#endif
}
return 0;
}
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