/* 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.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <bsp/consoleIo.h>
#include <libcpu/io.h>
#include <libcpu/spr.h>
#include <bsp/pci.h>
#include <bsp/residual.h>
#include <bsp/openpic.h>
#include <bsp/irq.h>
#include <bsp.h>
#include <libcpu/raw_exception.h>
#include <bsp/motorola.h>
/*
#define SHOW_ISA_PCI_BRIDGE_SETTINGS
*/
typedef struct {
unsigned char bus; /* few chance the PCI/ISA bridge is not on first bus but ... */
unsigned char device;
unsigned char function;
} pci_isa_bridge_device;
pci_isa_bridge_device* via_82c586 = 0;
static pci_isa_bridge_device bridge;
extern unsigned int external_exception_vector_prolog_code_size;
extern void external_exception_vector_prolog_code();
extern unsigned int decrementer_exception_vector_prolog_code_size;
extern void decrementer_exception_vector_prolog_code();
/*
* default on/off function
*/
static void nop_func(){}
/*
* default isOn function
*/
static int not_connected() {return 0;}
/*
* default possible isOn function
*/
static int connected() {return 1;}
static rtems_irq_connect_data rtemsIrq[BSP_IRQ_NUMBER];
static rtems_irq_global_settings initial_config;
static rtems_irq_connect_data defaultIrq = {
/* vectorIdex, hdl , on , off , isOn */
0, nop_func , nop_func , nop_func , not_connected
};
static rtems_irq_prio irqPrioTable[BSP_IRQ_NUMBER]={
/*
* actual rpiorities for interrupt :
* 0 means that only current interrupt is masked
* 255 means all other interrupts are masked
*/
/*
* ISA interrupts.
* The second entry has a priority of 255 because
* it is the slave pic entry and is should always remain
* unmasked.
*/
0,0,
255,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/*
* PCI Interrupts
*/
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* for raven prio 0 means unactive... */
/*
* Processor exceptions handled as interrupts
*/
0
};
static unsigned char mcp750_openpic_initsenses[] = {
1, /* MCP750_INT_PCB(8259) */
0, /* MCP750_INT_FALCON_ECC_ERR */
1, /* MCP750_INT_PCI_ETHERNET */
1, /* MCP750_INT_PCI_PMC */
1, /* MCP750_INT_PCI_WATCHDOG_TIMER1 */
1, /* MCP750_INT_PCI_PRST_SIGNAL */
1, /* MCP750_INT_PCI_FALL_SIGNAL */
1, /* MCP750_INT_PCI_DEG_SIGNAL */
1, /* MCP750_INT_PCI_BUS1_INTA */
1, /* MCP750_INT_PCI_BUS1_INTB */
1, /* MCP750_INT_PCI_BUS1_INTC */
1, /* MCP750_INT_PCI_BUS1_INTD */
1, /* MCP750_INT_PCI_BUS2_INTA */
1, /* MCP750_INT_PCI_BUS2_INTB */
1, /* MCP750_INT_PCI_BUS2_INTC */
1, /* MCP750_INT_PCI_BUS2_INTD */
};
void VIA_isa_bridge_interrupts_setup(void)
{
pci_isa_bridge_device pci_dev;
unsigned int temp;
unsigned char tmp;
unsigned char maxBus;
unsigned found = 0;
maxBus = BusCountPCI();
pci_dev.function = 0; /* Assumes the bidge is the first function */
for (pci_dev.bus = 0; pci_dev.bus < maxBus; pci_dev.bus++) {
#ifdef SCAN_PCI_PRINT
printk("isa_bridge_interrupts_setup: Scanning bus %d\n", pci_dev.bus);
#endif
for (pci_dev.device = 0; pci_dev.device < PCI_MAX_DEVICES; pci_dev.device++) {
#ifdef SCAN_PCI_PRINT
printk("isa_bridge_interrupts_setup: Scanning device %d\n", pci_dev.device);
#endif
pci_read_config_dword(pci_dev.bus, pci_dev.device, pci_dev.function,
PCI_VENDOR_ID, &temp);
#ifdef SCAN_PCI_PRINT
printk("Vendor/device = %x\n", temp);
#endif
if ((temp == (((unsigned short) PCI_VENDOR_ID_VIA) | (PCI_DEVICE_ID_VIA_82C586_0 << 16)))
) {
bridge = pci_dev;
via_82c586 = &bridge;
#ifdef SHOW_ISA_PCI_BRIDGE_SETTINGS
/*
* Should print : bus = 0, device = 11, function = 0 on a MCP750.
*/
printk("Via PCI/ISA bridge found at bus = %d, device = %d, function = %d\n",
via_82c586->bus,
via_82c586->device,
via_82c586->function);
#endif
found = 1;
goto loop_exit;
}
}
}
loop_exit:
if (!found) BSP_panic("VIA_82C586 PCI/ISA bridge not found!n");
tmp = inb(0x810);
if ( !(tmp & 0x2)) {
#ifdef SHOW_ISA_PCI_BRIDGE_SETTINGS
printk("This is a second generation MCP750 board\n");
printk("We must reprogram the PCI/ISA bridge...\n");
#endif
pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function,
0x47, &tmp);
#ifdef SHOW_ISA_PCI_BRIDGE_SETTINGS
printk(" PCI ISA bridge control2 = %x\n", (unsigned) tmp);
#endif
/*
* Enable 4D0/4D1 ISA interrupt level/edge config registers
*/
tmp |= 0x20;
pci_write_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function,
0x47, tmp);
/*
* Now program the ISA interrupt edge/level
*/
tmp = ELCRS_INT9_LVL | ELCRS_INT10_LVL | ELCRS_INT11_LVL;
outb(tmp, ISA8259_S_ELCR);
tmp = ELCRM_INT5_LVL;
outb(tmp, ISA8259_M_ELCR);;
/*
* Set the Interrupt inputs to non-inverting level interrupt
*/
pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function,
0x54, &tmp);
#ifdef SHOW_ISA_PCI_BRIDGE_SETTINGS
printk(" PCI ISA bridge PCI/IRQ Edge/Level Select = %x\n", (unsigned) tmp);
#endif
tmp = 0;
pci_write_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function,
0x54, tmp);
}
else {
#ifdef SHOW_ISA_PCI_BRIDGE_SETTINGS
printk("This is a first generation MCP750 board\n");
printk("We just show the actual value used by PCI/ISA bridge\n");
#endif
pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function,
0x47, &tmp);
#ifdef SHOW_ISA_PCI_BRIDGE_SETTINGS
printk(" PCI ISA bridge control2 = %x\n", (unsigned) tmp);
#endif
/*
* Show the Interrupt inputs inverting/non-inverting level status
*/
pci_read_config_byte(via_82c586->bus, via_82c586->device, via_82c586->function,
0x54, &tmp);
#ifdef SHOW_ISA_PCI_BRIDGE_SETTINGS
printk(" PCI ISA bridge PCI/IRQ Edge/Level Select = %x\n", (unsigned) tmp);
#endif
}
}
/*
* 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)
{
rtems_raw_except_connect_data vectorDesc;
int known_cpi_isa_bridge = 0;
int i;
/*
* First initialize the Interrupt management hardware
*/
OpenPIC_InitSenses = mcp750_openpic_initsenses;
OpenPIC_NumInitSenses = sizeof(mcp750_openpic_initsenses) / sizeof(char);
#ifdef TRACE_IRQ_INIT
printk("Going to initialize raven interrupt controller (openpic compliant)\n");
#endif
openpic_init(1);
#ifdef TRACE_IRQ_INIT
printk("Going to initialize the PCI/ISA bridge IRQ related setting (VIA 82C586)\n");
#endif
if ( currentBoard == MESQUITE ) {
VIA_isa_bridge_interrupts_setup();
known_cpi_isa_bridge = 1;
}
if ( currentBoard == MVME_2300 ) {
/* nothing to do for W83C553 bridge */
known_cpi_isa_bridge = 1;
}
if (!known_cpi_isa_bridge) {
printk("Please add code for PCI/ISA bridge init to libbsp/shared/irq/irq_init.c\n");
printk("If your card works correctly please add a test and set known_cpi_isa_bridge to true\n");
}
#ifdef TRACE_IRQ_INIT
printk("Going to initialize the ISA PC legacy IRQ management hardware\n");
#endif
BSP_i8259s_init();
/*
* Initialize Rtems management interrupt table
*/
/*
* 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_ASM_IRQ_VECTOR_BASE;
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");
}
/*
* We must connect the raw irq handler for the two
* expected interrupt sources : decrementer and external interrupts.
*/
vectorDesc.exceptIndex = ASM_DEC_VECTOR;
vectorDesc.hdl.vector = ASM_DEC_VECTOR;
vectorDesc.hdl.raw_hdl = decrementer_exception_vector_prolog_code;
vectorDesc.hdl.raw_hdl_size = (unsigned) &decrementer_exception_vector_prolog_code_size;
vectorDesc.on = nop_func;
vectorDesc.off = nop_func;
vectorDesc.isOn = connected;
if (!mpc60x_set_exception (&vectorDesc)) {
BSP_panic("Unable to initialize RTEMS decrementer raw exception\n");
}
vectorDesc.exceptIndex = ASM_EXT_VECTOR;
vectorDesc.hdl.vector = ASM_EXT_VECTOR;
vectorDesc.hdl.raw_hdl = external_exception_vector_prolog_code;
vectorDesc.hdl.raw_hdl_size = (unsigned) &external_exception_vector_prolog_code_size;
if (!mpc60x_set_exception (&vectorDesc)) {
BSP_panic("Unable to initialize RTEMS external raw exception\n");
}
#ifdef TRACE_IRQ_INIT
printk("RTEMS IRQ management is now operationnal\n");
#endif
}
