arch/ppc/syslib/ppc405_pci.c

   1 /*
   2  * Authors: Frank Rowand <frank_rowand@mvista.com>,
   3  * Debbie Chu <debbie_chu@mvista.com>, or source@mvista.com
   4  * Further modifications by Armin Kuster <akuster@mvista.com>
   5  *
   6  * 2000 (c) MontaVista, Software, Inc.  This file is licensed under
   7  * the terms of the GNU General Public License version 2.  This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  *
  11  * Based on arch/ppc/kernel/indirect.c, Copyright (C) 1998 Gabriel Paubert.
  12  */
  13
  14 #include <linux/pci.h>
  15 #include <asm/io.h>
  16 #include <asm/system.h>
  17 #include <asm/machdep.h>
  18 #include <linux/init.h>
  19 #include <linux/errno.h>
  20 #include <asm/ocp.h>
  21 #include <asm/ibm4xx.h>
  22 #include <asm/pci-bridge.h>
  23 #include <asm/ibm_ocp_pci.h>
  24
  25
  26 extern void bios_fixup(struct pci_controller *, struct pcil0_regs *);
  27 extern int ppc405_map_irq(struct pci_dev *dev, unsigned char idsel,
  28                           unsigned char pin);
  29
  30 void
  31 ppc405_pcibios_fixup_resources(struct pci_dev *dev)
  32 {
  33         int i;
  34         unsigned long max_host_addr;
  35         unsigned long min_host_addr;
  36         struct resource *res;
  37
  38         /*
  39          * openbios puts some graphics cards in the same range as the host
  40          * controller uses to map to SDRAM.  Fix it.
  41          */
  42
  43         min_host_addr = 0;
  44         max_host_addr = PPC405_PCI_MEM_BASE - 1;
  45
  46         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
  47                 res = dev->resource + i;
  48                 if (!res->start)
  49                         continue;
  50                 if ((res->flags & IORESOURCE_MEM) &&
  51                     (((res->start >= min_host_addr)
  52                       && (res->start <= max_host_addr))
  53                      || ((res->end >= min_host_addr)
  54                          && (res->end <= max_host_addr))
  55                      || ((res->start < min_host_addr)
  56                          && (res->end > max_host_addr))
  57                     )
  58                     ) {
  59
  60                         /* force pcibios_assign_resources() to assign a new address */
  61                         res->end -= res->start;
  62                         res->start = 0;
  63                 }
  64         }
  65 }
  66
  67 static int
  68 ppc4xx_exclude_device(unsigned char bus, unsigned char devfn)
  69 {
  70         /* We prevent us from seeing ourselves to avoid having
  71          * the kernel try to remap our BAR #1 and fuck up bus
  72          * master from external PCI devices
  73          */
  74         return (bus == 0 && devfn == 0);
  75 }
  76
  77 void
  78 ppc4xx_find_bridges(void)
  79 {
  80         struct pci_controller *hose_a;
  81         struct pcil0_regs *pcip;
  82         unsigned int tmp_addr;
  83         unsigned int tmp_size;
  84         unsigned int reg_index;
  85         unsigned int new_pmm_max = 0;
  86         unsigned int new_pmm_min = 0;
  87
  88         isa_io_base = 0;
  89         isa_mem_base = 0;
  90         pci_dram_offset = 0;
  91
  92 #if  (PSR_PCI_ARBIT_EN > 1)
  93         /* Check if running in slave mode */
  94         if ((mfdcr(DCRN_CHPSR) & PSR_PCI_ARBIT_EN) == 0) {
  95                 printk("Running as PCI slave, kernel PCI disabled !\n");
  96                 return;
  97         }
  98 #endif
  99         /* Setup PCI32 hose */
 100         hose_a = pcibios_alloc_controller();
 101         if (!hose_a)
 102                 return;
 103         setup_indirect_pci(hose_a, PPC405_PCI_CONFIG_ADDR,
 104                            PPC405_PCI_CONFIG_DATA);
 105
 106         pcip = ioremap(PPC4xx_PCI_LCFG_PADDR, PAGE_SIZE);
 107         if (pcip != NULL) {
 108
 109 #if defined(CONFIG_BIOS_FIXUP)
 110                 bios_fixup(hose_a, pcip);
 111 #endif
 112                 new_pmm_min = 0xffffffff;
 113                 for (reg_index = 0; reg_index < 3; reg_index++) {
 114                         tmp_size = in_le32(&pcip->pmm[reg_index].ma);   // mask & attrs
 115                         /* test the enable bit */
 116                         if ((tmp_size & 0x1) == 0)
 117                                 continue;
 118                         tmp_addr = in_le32(&pcip->pmm[reg_index].pcila);        // PCI addr
 119                         if (tmp_addr < PPC405_PCI_PHY_MEM_BASE) {
 120                                 printk(KERN_DEBUG
 121                                        "Disabling mapping to PCI mem addr 0x%8.8x\n",
 122                                        tmp_addr);
 123                                 out_le32(&pcip->pmm[reg_index].ma, tmp_size & ~1);      // *_PMMOMA
 124                                 continue;
 125                         }
 126                         tmp_addr = in_le32(&pcip->pmm[reg_index].la);   // *_PMMOLA
 127                         if (tmp_addr < new_pmm_min)
 128                                 new_pmm_min = tmp_addr;
 129                         tmp_addr = tmp_addr +
 130                                 (0xffffffff - (tmp_size & 0xffffc000));
 131                         if (tmp_addr > PPC405_PCI_UPPER_MEM) {
 132                                 new_pmm_max = tmp_addr; // PPC405_PCI_UPPER_MEM
 133                         } else {
 134                                 new_pmm_max = PPC405_PCI_UPPER_MEM;
 135                         }
 136
 137                 }               // for
 138
 139                 iounmap(pcip);
 140         }
 141
 142         hose_a->first_busno = 0;
 143         hose_a->last_busno = 0xff;
 144         hose_a->pci_mem_offset = 0;
 145
 146         /* Setup bridge memory/IO ranges & resources
 147          * TODO: Handle firmwares setting up a legacy ISA mem base
 148          */
 149         hose_a->io_space.start = PPC405_PCI_LOWER_IO;
 150         hose_a->io_space.end = PPC405_PCI_UPPER_IO;
 151         hose_a->mem_space.start = new_pmm_min;
 152         hose_a->mem_space.end = new_pmm_max;
 153         hose_a->io_base_phys = PPC405_PCI_PHY_IO_BASE;
 154         hose_a->io_base_virt = ioremap(hose_a->io_base_phys, 0x10000);
 155         hose_a->io_resource.start = 0;
 156         hose_a->io_resource.end = PPC405_PCI_UPPER_IO - PPC405_PCI_LOWER_IO;
 157         hose_a->io_resource.flags = IORESOURCE_IO;
 158         hose_a->io_resource.name = "PCI I/O";
 159         hose_a->mem_resources[0].start = new_pmm_min;
 160         hose_a->mem_resources[0].end = new_pmm_max;
 161         hose_a->mem_resources[0].flags = IORESOURCE_MEM;
 162         hose_a->mem_resources[0].name = "PCI Memory";
 163         isa_io_base = (int) hose_a->io_base_virt;
 164         isa_mem_base = 0;       /*     ISA not implemented */
 165         ISA_DMA_THRESHOLD = 0x00ffffff; /* ??? ISA not implemented */
 166
 167         /* Scan busses & initial setup by pci_auto */
 168         hose_a->last_busno = pciauto_bus_scan(hose_a, hose_a->first_busno);
 169         hose_a->last_busno = 0;
 170
 171         /* Setup ppc_md */
 172         ppc_md.pcibios_fixup = NULL;
 173         ppc_md.pci_exclude_device = ppc4xx_exclude_device;
 174         ppc_md.pcibios_fixup_resources = ppc405_pcibios_fixup_resources;
 175         ppc_md.pci_swizzle = common_swizzle;
 176         ppc_md.pci_map_irq = ppc405_map_irq;
 177 }