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ppc405_pci.c

/*
 * Authors: Frank Rowand <frank_rowand@mvista.com>,
 * Debbie Chu <debbie_chu@mvista.com>, or source@mvista.com
 * Further modifications by Armin Kuster <akuster@mvista.com>
 *
 * 2000 (c) MontaVista, Software, Inc.  This file is licensed under
 * the terms of the GNU General Public License version 2.  This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 *
 * Based on arch/ppc/kernel/indirect.c, Copyright (C) 1998 Gabriel Paubert.
 */

#include <linux/pci.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <asm/ocp.h>
#include <asm/ibm4xx.h>
#include <asm/pci-bridge.h>
#include <asm/ibm_ocp_pci.h>


extern void bios_fixup(struct pci_controller *, struct pcil0_regs *);
extern int ppc405_map_irq(struct pci_dev *dev, unsigned char idsel,
                    unsigned char pin);

void
ppc405_pcibios_fixup_resources(struct pci_dev *dev)
{
      int i;
      unsigned long max_host_addr;
      unsigned long min_host_addr;
      struct resource *res;

      /*
       * openbios puts some graphics cards in the same range as the host
       * controller uses to map to SDRAM.  Fix it.
       */

      min_host_addr = 0;
      max_host_addr = PPC405_PCI_MEM_BASE - 1;

      for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
            res = dev->resource + i;
            if (!res->start)
                  continue;
            if ((res->flags & IORESOURCE_MEM) &&
                (((res->start >= min_host_addr)
                  && (res->start <= max_host_addr))
                 || ((res->end >= min_host_addr)
                   && (res->end <= max_host_addr))
                 || ((res->start < min_host_addr)
                   && (res->end > max_host_addr))
                )
                ) {

                  /* force pcibios_assign_resources() to assign a new address */
                  res->end -= res->start;
                  res->start = 0;
            }
      }
}

static int
ppc4xx_exclude_device(unsigned char bus, unsigned char devfn)
{
      /* We prevent us from seeing ourselves to avoid having
       * the kernel try to remap our BAR #1 and fuck up bus
       * master from external PCI devices
       */
      return (bus == 0 && devfn == 0);
}

void
ppc4xx_find_bridges(void)
{
      struct pci_controller *hose_a;
      struct pcil0_regs *pcip;
      unsigned int tmp_addr;
      unsigned int tmp_size;
      unsigned int reg_index;
      unsigned int new_pmm_max = 0;
      unsigned int new_pmm_min = 0;

      isa_io_base = 0;
      isa_mem_base = 0;
      pci_dram_offset = 0;

      /* Setup PCI32 hose */
      hose_a = pcibios_alloc_controller();
      if (!hose_a)
            return;
      setup_indirect_pci(hose_a, PPC405_PCI_CONFIG_ADDR,
                     PPC405_PCI_CONFIG_DATA);

      pcip = ioremap(PPC4xx_PCI_LCFG_PADDR, PAGE_SIZE);
      if (pcip != NULL) {

#if defined(CONFIG_BIOS_FIXUP)
            bios_fixup(hose_a, pcip);
#endif
            new_pmm_min = 0xffffffff;
            for (reg_index = 0; reg_index < 3; reg_index++) {
                  tmp_size = in_le32(&pcip->pmm[reg_index].ma);   // mask & attrs
                  /* test the enable bit */
                  if ((tmp_size & 0x1) == 0)
                        continue;
                  tmp_addr = in_le32(&pcip->pmm[reg_index].pcila);      // PCI addr
                  if (tmp_addr < PPC405_PCI_PHY_MEM_BASE) {
                        printk(KERN_DEBUG
                               "Disabling mapping to PCI mem addr 0x%8.8x\n",
                               tmp_addr);
                        out_le32(&pcip->pmm[reg_index].ma, tmp_size & ~1);    // *_PMMOMA
                        continue;
                  }
                  tmp_addr = in_le32(&pcip->pmm[reg_index].la);   // *_PMMOLA
                  if (tmp_addr < new_pmm_min)
                        new_pmm_min = tmp_addr;
                  tmp_addr = tmp_addr +
                        (0xffffffff - (tmp_size & 0xffffc000));
                  if (tmp_addr > PPC405_PCI_UPPER_MEM) {
                        new_pmm_max = tmp_addr; // PPC405_PCI_UPPER_MEM
                  } else {
                        new_pmm_max = PPC405_PCI_UPPER_MEM;
                  }

            }           // for

            iounmap(pcip);
      }

      hose_a->first_busno = 0;
      hose_a->last_busno = 0xff;
      hose_a->pci_mem_offset = 0;

      /* Setup bridge memory/IO ranges & resources
       * TODO: Handle firmware setting up a legacy ISA mem base
       */
      hose_a->io_space.start = PPC405_PCI_LOWER_IO;
      hose_a->io_space.end = PPC405_PCI_UPPER_IO;
      hose_a->mem_space.start = new_pmm_min;
      hose_a->mem_space.end = new_pmm_max;
      hose_a->io_base_phys = PPC405_PCI_PHY_IO_BASE;
      hose_a->io_base_virt = ioremap(hose_a->io_base_phys, 0x10000);
      hose_a->io_resource.start = 0;
      hose_a->io_resource.end = PPC405_PCI_UPPER_IO - PPC405_PCI_LOWER_IO;
      hose_a->io_resource.flags = IORESOURCE_IO;
      hose_a->io_resource.name = "PCI I/O";
      hose_a->mem_resources[0].start = new_pmm_min;
      hose_a->mem_resources[0].end = new_pmm_max;
      hose_a->mem_resources[0].flags = IORESOURCE_MEM;
      hose_a->mem_resources[0].name = "PCI Memory";
      isa_io_base = (int) hose_a->io_base_virt;
      isa_mem_base = 0; /*     ISA not implemented */
      ISA_DMA_THRESHOLD = 0x00ffffff;     /* ??? ISA not implemented */

      /* Scan busses & initial setup by pci_auto */
      hose_a->last_busno = pciauto_bus_scan(hose_a, hose_a->first_busno);
      hose_a->last_busno = 0;

      /* Setup ppc_md */
      ppc_md.pcibios_fixup = NULL;
      ppc_md.pci_exclude_device = ppc4xx_exclude_device;
      ppc_md.pcibios_fixup_resources = ppc405_pcibios_fixup_resources;
      ppc_md.pci_swizzle = common_swizzle;
      ppc_md.pci_map_irq = ppc405_map_irq;
}

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