source: rtems/c/src/lib/libbsp/powerpc/shared/pci/detect_raven_bridge.c @ 7657233d

/*
 *  $Id$
 */

#include <libcpu/io.h>

#include <bsp.h>
#include <bsp/pci.h>
#include <bsp/consoleIo.h>
#include <bsp/residual.h>
#include <bsp/openpic.h>

#include <rtems/bspIo.h>

#define RAVEN_MPIC_IOSPACE_ENABLE       0x1
#define RAVEN_MPIC_MEMSPACE_ENABLE      0x2
#define RAVEN_MASTER_ENABLE             0x4
#define RAVEN_PARITY_CHECK_ENABLE       0x40
#define RAVEN_SYSTEM_ERROR_ENABLE       0x100
#define RAVEN_CLEAR_EVENTS_MASK         0xf9000000

#define pci BSP_pci_configuration

extern const pci_config_access_functions pci_direct_functions;
extern const pci_config_access_functions pci_indirect_functions;

void detect_host_bridge()
{
  PPC_DEVICE *hostbridge;
  unsigned int id0;
  unsigned int tmp;
  
  /*
   * This code assumes that the host bridge is located at
   * bus 0, dev 0, func 0 AND that the old pre PCI 2.1
   * standart devices detection mecahnism that was used on PC
   * (still used in BSD source code) works.
   */
  hostbridge=residual_find_device(&residualCopy, PROCESSORDEVICE, NULL, 
                                  BridgeController,
                                  PCIBridge, -1, 0);
  if (hostbridge) {
    if (hostbridge->DeviceId.Interface==PCIBridgeIndirect) {
      pci.pci_functions=&pci_indirect_functions;
      /* Should be extracted from residual data, 
       * indeed MPC106 in CHRP mode is different,
       * but we should not use residual data in
       * this case anyway. 
       */
      pci.pci_config_addr = ((volatile unsigned char *) 
                              (ptr_mem_map->io_base+0xcf8));
      pci.pci_config_data = ptr_mem_map->io_base+0xcfc;
    } else if(hostbridge->DeviceId.Interface==PCIBridgeDirect) {
      pci.pci_functions=&pci_direct_functions;
      pci.pci_config_data=(unsigned char *) 0x80800000;
    } else {
    }
  } else {
    /* Let us try by experimentation at our own risk! */
    pci.pci_functions = &pci_direct_functions;
    /* On all direct bridges I know the host bridge itself
     * appears as device 0 function 0. 
                 */
    pci_read_config_dword(0, 0, 0, PCI_VENDOR_ID, &id0);
    if (id0==~0U) {
      pci.pci_functions = &pci_indirect_functions;
      pci.pci_config_addr = ((volatile unsigned char*)
                              (ptr_mem_map->io_base+0xcf8));
      pci.pci_config_data = ((volatile unsigned char*)ptr_mem_map->io_base+0xcfc);
    }
    /* Here we should check that the host bridge is actually
     * present, but if it not, we are in such a desperate
     * situation, that we probably can't even tell it.
     */
  }
  pci_read_config_dword(0, 0, 0, 0, &id0);
  if(id0 == PCI_VENDOR_ID_MOTOROLA +
     (PCI_DEVICE_ID_MOTOROLA_RAVEN<<16)) {
    /*
     * We have a Raven bridge. We will get information about its settings
     */
    pci_read_config_dword(0, 0, 0, PCI_COMMAND, &id0);
#ifdef SHOW_RAVEN_SETTING    
    printk("RAVEN PCI command register = %x\n",id0);
#endif    
    id0 |= RAVEN_CLEAR_EVENTS_MASK;
    pci_write_config_dword(0, 0, 0, PCI_COMMAND, id0);
    pci_read_config_dword(0, 0, 0, PCI_COMMAND, &id0);
#ifdef SHOW_RAVEN_SETTING    
    printk("After error clearing RAVEN PCI command register = %x\n",id0);
#endif    
    
    if (id0 & RAVEN_MPIC_IOSPACE_ENABLE) {
      pci_read_config_dword(0, 0, 0,PCI_BASE_ADDRESS_0, &tmp);
#ifdef SHOW_RAVEN_SETTING    
      printk("Raven MPIC is accessed via IO Space Access at address : %x\n",(tmp & ~0x1));
#endif    
    }
    if (id0 & RAVEN_MPIC_MEMSPACE_ENABLE) {
      pci_read_config_dword(0, 0, 0,PCI_BASE_ADDRESS_1, &tmp);
#ifdef SHOW_RAVEN_SETTING    
      printk("Raven MPIC is accessed via memory Space Access at address : %x\n", tmp);
#endif    
      OpenPIC=(volatile struct OpenPIC *) (tmp + PREP_ISA_MEM_BASE);
      printk("OpenPIC found at %p.\n",
             OpenPIC);
    }
  }
  if (OpenPIC == (volatile struct OpenPIC *)0) {
    BSP_panic("OpenPic Not found\n");
  }

}