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|
/*===============================================================*\
| Project: RTEMS virtex BSP |
+-----------------------------------------------------------------+
| Partially based on the code references which are named below. |
| Adaptions, modifications, enhancements and any recent parts of |
| the code are: |
| Copyright (c) 2007 |
| Embedded Brains GmbH |
| Obere Lagerstr. 30 |
| D-82178 Puchheim |
| Germany |
| rtems@embedded-brains.de |
+-----------------------------------------------------------------+
| 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. |
| |
+-----------------------------------------------------------------+
| this file contains the irq controller handler |
\*===============================================================*/
#include <libcpu/spr.h>
#include <bsp/irq.h>
#include <bsp.h>
#include <rtems/bspIo.h>
#include <rtems/powerpc/powerpc.h>
#include <bsp/vectors.h>
static rtems_irq_connect_data rtemsIrqTbl[BSP_IRQ_NUMBER];
rtems_irq_connect_data *BSP_rtems_irq_tbl;
rtems_irq_global_settings* BSP_rtems_irq_config;
/***********************************************************
* dummy functions for on/off/isOn calls
* these functions just do nothing fulfill the semantic
* requirements to enable/disable a certain interrupt or exception
*/
static void BSP_irq_nop_func(const rtems_irq_connect_data *unused)
{
/*
* nothing to do
*/
}
static void BSP_irq_nop_hdl(void *hdl)
{
/*
* nothing to do
*/
}
static int BSP_irq_isOn_func(const rtems_irq_connect_data *unused)
{
/*
* nothing to do
*/
return 0;
}
/***********************************************************
* interrupt handler and its enable/disable functions
***********************************************************/
/***********************************************************
* functions to enable/disable/query external/critical interrupts
*/
void BSP_irqexc_on_fnc(const rtems_irq_connect_data *conn_data)
{
uint32_t msr_value;
/*
* get current MSR value
*/
_CPU_MSR_GET(msr_value);
msr_value |= PPC_MSR_EE;
_CPU_MSR_SET(msr_value);
}
void BSP_irqexc_off_fnc(const rtems_irq_connect_data *unused)
{
uint32_t msr_value;
/*
* get current MSR value
*/
_CPU_MSR_GET(msr_value);
msr_value &= ~PPC_MSR_EE;
_CPU_MSR_SET(msr_value);
}
/***********************************************************
* High level IRQ handler called from shared_raw_irq_code_entry
*/
static int C_dispatch_irq_handler (BSP_Exception_frame *frame, unsigned int excNum)
{
/*
* Handle interrupt
*/
switch(excNum) {
case ASM_EXT_VECTOR:
BSP_rtems_irq_tbl[BSP_EXT].hdl(BSP_rtems_irq_tbl[BSP_EXT].handle);
break;
case ASM_BOOKE_DEC_VECTOR:
BSP_rtems_irq_tbl[BSP_PIT].hdl(BSP_rtems_irq_tbl[BSP_PIT].handle);
break;
#if 0 /* Critical interrupts not yet supported */
case ASM_BOOKE_CRIT_VECTOR:
BSP_rtems_irq_tbl[BSP_CRIT].hdl(BSP_rtems_irq_tbl[BSP_CRIT].handle);
break;
#endif
}
return 0;
}
/***********************************************************
* functions to set/get/remove interrupt handlers
***********************************************************/
int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
/*
* check for valid irq name
* if invalid, print error and return 0
*/
if (!BSP_IS_VALID_IRQ(irq->name)) {
printk("Invalid interrupt vector %d\n",irq->name);
return 0;
}
/*
* disable interrupts
*/
rtems_interrupt_disable(level);
/*
* check, that default handler is installed now
*/
if (rtemsIrqTbl[irq->name].hdl != BSP_rtems_irq_config->defaultEntry.hdl) {
rtems_interrupt_enable(level);
printk("IRQ vector %d already connected\n",irq->name);
return 0;
}
/*
* store new handler data
*/
rtemsIrqTbl[irq->name] = *irq;
/*
* call "on" function to enable interrupt at device
*/
irq->on(irq);
/*
* reenable interrupts
*/
rtems_interrupt_enable(level);
return 1;
}
int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
/*
* check for valid IRQ name
*/
if (!BSP_IS_VALID_IRQ(irq->name)) {
return 0;
}
rtems_interrupt_disable(level);
/*
* return current IRQ entry
*/
*irq = rtemsIrqTbl[irq->name];
rtems_interrupt_enable(level);
return 1;
}
int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq)
{
rtems_interrupt_level level;
/*
* check for valid IRQ name
*/
if (!BSP_IS_VALID_IRQ(irq->name)) {
return 0;
}
rtems_interrupt_disable(level);
/*
* check, that specified handler is really connected now
*/
if (rtemsIrqTbl[irq->name].hdl != irq->hdl) {
rtems_interrupt_enable(level);
return 0;
}
/*
* disable interrupt at source
*/
irq->off(irq);
/*
* restore default interrupt handler
*/
rtemsIrqTbl[irq->name] = BSP_rtems_irq_config->defaultEntry;
/*
* reenable interrupts
*/
rtems_interrupt_enable(level);
return 1;
}
/***********************************************************
* functions to set/get the basic interrupt management setup
***********************************************************/
/*
* (Re) get info on current RTEMS interrupt management.
*/
int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** ret_ptr)
{
*ret_ptr = BSP_rtems_irq_config;
return 0;
}
/*
* set management stuff
*/
int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config)
{
int i;
rtems_interrupt_level level;
rtems_interrupt_disable(level);
/*
* store given configuration
*/
BSP_rtems_irq_config = config;
BSP_rtems_irq_tbl = BSP_rtems_irq_config->irqHdlTbl;
/*
* store any irq-like processor exceptions
*/
for (i = BSP_PROCESSOR_IRQ_LOWEST_OFFSET;
i < BSP_PROCESSOR_IRQ_MAX_OFFSET;
i++) {
if (BSP_rtems_irq_tbl[i].hdl != config->defaultEntry.hdl) {
if (BSP_rtems_irq_tbl[i].on != NULL) {
BSP_rtems_irq_tbl[i].on
(&(BSP_rtems_irq_tbl[i]));
}
}
else {
if (BSP_rtems_irq_tbl[i].off != NULL) {
BSP_rtems_irq_tbl[i].off
(&(BSP_rtems_irq_tbl[i]));
}
}
}
rtems_interrupt_enable(level);
return 1;
}
/*
* dummy for an empty IRQ handler entry
*/
static rtems_irq_connect_data emptyIrq = {
0, /* IRQ Name */
BSP_irq_nop_hdl, /* handler function */
NULL, /* handle passed to handler */
BSP_irq_nop_func, /* on function */
BSP_irq_nop_func, /* off function */
BSP_irq_isOn_func /* isOn function */
};
static rtems_irq_global_settings initialConfig = {
BSP_IRQ_NUMBER, /* IRQ Number */
{ 0, /* IRQ Name */
BSP_irq_nop_hdl, /* handler function */
NULL, /* handle passed to handler */
BSP_irq_nop_func, /* on function */
BSP_irq_nop_func, /* off function */
BSP_irq_isOn_func /* isOn function */
}, /* emptyIrq */
rtemsIrqTbl, /* irqHdlTbl */
0, /* irqBase */
NULL /* irqPrioTbl */
};
void BSP_rtems_irq_mngt_init(unsigned cpuId)
{
int i;
/*
* connect all exception vectors needed
*/
ppc_exc_set_handler(ASM_EXT_VECTOR, C_dispatch_irq_handler);
ppc_exc_set_handler(ASM_BOOKE_DEC_VECTOR, C_dispatch_irq_handler);
/*
* setup interrupt handlers table
*/
for (i = 0;
i < BSP_IRQ_NUMBER;
i++) {
rtemsIrqTbl[i] = emptyIrq;
rtemsIrqTbl[i].name = i;
}
/*
* initialize interrupt management
*/
if (!BSP_rtems_irq_mngt_set(&initialConfig)) {
BSP_panic("Unable to initialize RTEMS interrupt Management!!! System locked\n");
}
}
|
