/*
*
* This file contains the PIC-independent implementation of the functions 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.com/license/LICENSE.
*/
#include <stdlib.h>
#include <rtems.h>
#include "irq_supp.h"
#include <rtems/score/apiext.h> /* for post ISR signal processing */
#include <bsp/vectors.h>
#include <stdlib.h>
#include <rtems/bspIo.h> /* for printk */
#include <libcpu/spr.h>
/*
* default handler connected on each irq after bsp initialization
*/
static rtems_irq_connect_data default_rtems_entry;
/*
* location used to store initial tables used for interrupt
* management.
*/
static rtems_irq_global_settings* internal_config;
static rtems_irq_connect_data* rtems_hdl_tbl;
SPR_RW(BOOKE_TSR)
SPR_RW(PPC405_TSR)
/* legacy mode for bookE DEC exception;
* to avoid the double layer of function calls
* (dec_handler_bookE -> C_dispatch_irq_handler -> user handler)
* it is preferrable for the user to hook the DEC
* exception directly.
* However, the legacy mode works with less modifications
* of user code.
*/
int C_dispatch_dec_handler_bookE (BSP_Exception_frame *frame, unsigned int excNum)
{
/* clear interrupt; we must do this
* before C_dispatch_irq_handler()
* re-enables MSR_EE.
* Note that PPC405 uses a different SPR# for TSR
*/
if ( ppc_cpu_is_bookE()==PPC_BOOKE_405)
_write_PPC405_TSR( BOOKE_TSR_DIS );
else
_write_BOOKE_TSR( BOOKE_TSR_DIS );
return C_dispatch_irq_handler(frame, ASM_DEC_VECTOR);
}
/*
* ------------------------ RTEMS Irq helper functions ----------------
*/
/*
* This function check that the value given for the irq line
* is valid.
*/
static int isValidInterrupt(int irq)
{
if ( (irq < internal_config->irqBase) || (irq >= internal_config->irqBase + internal_config->irqNb))
return 0;
return 1;
}
/*
* ------------------------ RTEMS Shared Irq Handler Mngt Routines ----------------
*/
int BSP_install_rtems_shared_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
rtems_irq_connect_data* vchain;
if (!isValidInterrupt(irq->name)) {
printk("Invalid interrupt vector %d\n",irq->name);
return 0;
}
/* pre-allocate memory outside of critical section */
vchain = (rtems_irq_connect_data*)malloc(sizeof(rtems_irq_connect_data));
rtems_interrupt_disable(level);
if ( (int)rtems_hdl_tbl[irq->name].next_handler == -1 ) {
rtems_interrupt_enable(level);
printk("IRQ vector %d already connected to an unshared handler\n",irq->name);
free(vchain);
return 0;
}
/* save off topmost handler */
vchain[0]= rtems_hdl_tbl[irq->name];
/*
* store the data provided by user
*/
rtems_hdl_tbl[irq->name] = *irq;
/* link chain to new topmost handler */
rtems_hdl_tbl[irq->name].next_handler = (void *)vchain;
/*
* enable_irq_at_pic is supposed to ignore
* requests to disable interrupts outside
* of the range handled by the PIC
*/
BSP_enable_irq_at_pic(irq->name);
/*
* Enable interrupt on device
*/
if (irq->on)
irq->on(irq);
rtems_interrupt_enable(level);
return 1;
}
/*
* ------------------------ RTEMS Single Irq Handler Mngt Routines ----------------
*/
int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
if (!isValidInterrupt(irq->name)) {
printk("Invalid interrupt vector %d\n",irq->name);
return 0;
}
/*
* Check if default handler is actually connected. If not issue an error.
* You must first get the current handler via i386_get_current_idt_entry
* and then disconnect it using i386_delete_idt_entry.
* RATIONALE : to always have the same transition by forcing the user
* to get the previous handler before accepting to disconnect.
*/
rtems_interrupt_disable(level);
if (rtems_hdl_tbl[irq->name].hdl != default_rtems_entry.hdl) {
rtems_interrupt_enable(level);
printk("IRQ vector %d already connected\n",irq->name);
return 0;
}
/*
* store the data provided by user
*/
rtems_hdl_tbl[irq->name] = *irq;
rtems_hdl_tbl[irq->name].next_handler = (void *)-1;
/*
* enable_irq_at_pic is supposed to ignore
* requests to disable interrupts outside
* of the range handled by the PIC
*/
BSP_enable_irq_at_pic(irq->name);
/*
* Enable interrupt on device
*/
if (irq->on)
irq->on(irq);
rtems_interrupt_enable(level);
return 1;
}
int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
if (!isValidInterrupt(irq->name)) {
return 0;
}
rtems_interrupt_disable(level);
*irq = rtems_hdl_tbl[irq->name];
rtems_interrupt_enable(level);
return 1;
}
int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_irq_connect_data *pchain= NULL, *vchain = NULL;
rtems_interrupt_level level;
if (!isValidInterrupt(irq->name)) {
return 0;
}
/*
* Check if default handler is actually connected. If not issue an error.
* You must first get the current handler via i386_get_current_idt_entry
* and then disconnect it using i386_delete_idt_entry.
* RATIONALE : to always have the same transition by forcing the user
* to get the previous handler before accepting to disconnect.
*/
rtems_interrupt_disable(level);
if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) {
rtems_interrupt_enable(level);
return 0;
}
if( (int)rtems_hdl_tbl[irq->name].next_handler != -1 )
{
int found = 0;
for( (pchain= NULL, vchain = &rtems_hdl_tbl[irq->name]);
(vchain->hdl != default_rtems_entry.hdl);
(pchain= vchain, vchain = (rtems_irq_connect_data*)vchain->next_handler) )
{
if( vchain->hdl == irq->hdl )
{
found= -1; break;
}
}
if( !found )
{
rtems_interrupt_enable(level);
return 0;
}
}
else
{
if (rtems_hdl_tbl[irq->name].hdl != irq->hdl)
{
rtems_interrupt_enable(level);
return 0;
}
}
/*
* Disable interrupt on device
*/
if (irq->off)
irq->off(irq);
/*
* restore the default irq value
*/
if( !vchain )
{
/* single handler vector... */
rtems_hdl_tbl[irq->name] = default_rtems_entry;
}
else
{
if( pchain )
{
/* non-first handler being removed */
pchain->next_handler = vchain->next_handler;
}
else
{
/* first handler isn't malloc'ed, so just overwrite it. Since
the contents of vchain are being struct copied, vchain itself
goes away */
vchain = vchain->next_handler;
rtems_hdl_tbl[irq->name]= *vchain;
}
}
/* Only disable at PIC if we removed the last handler */
if ( rtems_hdl_tbl[irq->name].hdl == default_rtems_entry.hdl ) {
/*
* disable_irq_at_pic is supposed to ignore
* requests to disable interrupts outside
* of the range handled by the PIC;
*/
BSP_disable_irq_at_pic(irq->name);
}
rtems_interrupt_enable(level);
free(vchain);
return 1;
}
/*
* Less cumbersome, alternate entry points;
* RETURNS: more traditional, 0 on success, nonzero on error
*/
static int doit(
int (*p)(const rtems_irq_connect_data*),
rtems_irq_number n,
rtems_irq_hdl hdl,
rtems_irq_hdl_param prm)
{
rtems_irq_connect_data xx;
xx.name = n;
xx.hdl = hdl;
xx.handle = prm;
xx.on = 0;
xx.off = 0;
xx.isOn = 0;
return ! p(&xx);
}
int BSP_rtems_int_connect(rtems_irq_number n, rtems_irq_hdl hdl, rtems_irq_hdl_param p)
{
return doit(BSP_install_rtems_shared_irq_handler, n, hdl, p);
}
int BSP_rtems_int_disconnect(rtems_irq_number n, rtems_irq_hdl hdl, rtems_irq_hdl_param p)
{
return doit(BSP_remove_rtems_irq_handler, n, hdl, p);
}
/*
* RTEMS Global Interrupt Handler Management Routines
*/
int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config)
{
int i;
rtems_interrupt_level level;
rtems_irq_connect_data* vchain;
/*
* Store various code accelerators
*/
internal_config = config;
default_rtems_entry = config->defaultEntry;
rtems_hdl_tbl = config->irqHdlTbl;
rtems_interrupt_disable(level);
if ( !BSP_setup_the_pic(config) ) {
printk("PIC setup failed; leaving IRQs OFF\n");
return 0;
}
for ( i = config->irqBase; i < config->irqBase + config->irqNb; i++ ) {
for( vchain = &rtems_hdl_tbl[i];
((int)vchain != -1 && vchain->hdl != default_rtems_entry.hdl);
vchain = (rtems_irq_connect_data*)vchain->next_handler )
{
if (vchain->on)
vchain->on(vchain);
}
if ( vchain != &rtems_hdl_tbl[i] ) {
/* at least one handler registered */
BSP_enable_irq_at_pic(i);
} else {
/* Do NOT disable; there might be boards with cascaded
* interrupt controllers where the BSP (incorrectly) does
* not ignore the cascaded interrupts in BSP_disable_irq_at_pic()!
* Instead, we rely on BSP_setup_the_pic() for a good
* initial configuration.
*
BSP_disable_irq_at_pic(i);
*/
}
}
rtems_interrupt_enable(level);
{
ppc_exc_set_handler(ASM_EXT_VECTOR, C_dispatch_irq_handler);
if ( ppc_cpu_is_bookE() ) {
/* bookE decrementer interrupt needs to be cleared BEFORE
* dispatching the user ISR (because the user ISR is called
* with EE enabled)
* We do this so that existing DEC handlers can be used
* with minor modifications.
*/
ppc_exc_set_handler(ASM_BOOKE_DEC_VECTOR, C_dispatch_dec_handler_bookE);
} else {
ppc_exc_set_handler(ASM_DEC_VECTOR, C_dispatch_irq_handler);
}
}
return 1;
}
int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** config)
{
*config = internal_config;
return 0;
}
