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   1 /* pci_common.c: PCI controller common support.
   2  *
   3  * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #include <linux/string.h>
   7 #include <linux/slab.h>
   8 #include <linux/init.h>
   9 #include <linux/pci.h>
  10 #include <linux/device.h>
  11
  12 #include <asm/prom.h>
  13 #include <asm/of_device.h>
  14 #include <asm/oplib.h>
  15
  16 #include "pci_impl.h"
  17
  18 void pci_get_pbm_props(struct pci_pbm_info *pbm)
  19 {
  20         const u32 *val = of_get_property(pbm->prom_node, "bus-range", NULL);
  21
  22         pbm->pci_first_busno = val[0];
  23         pbm->pci_last_busno = val[1];
  24
  25         val = of_get_property(pbm->prom_node, "ino-bitmap", NULL);
  26         if (val) {
  27                 pbm->ino_bitmap = (((u64)val[1] << 32UL) |
  28                                    ((u64)val[0] <<  0UL));
  29         }
  30 }
  31
  32 static void pci_register_legacy_regions(struct resource *io_res,
  33                                         struct resource *mem_res)
  34 {
  35         struct resource *p;
  36
  37         /* VGA Video RAM. */
  38         p = kzalloc(sizeof(*p), GFP_KERNEL);
  39         if (!p)
  40                 return;
  41
  42         p->name = "Video RAM area";
  43         p->start = mem_res->start + 0xa0000UL;
  44         p->end = p->start + 0x1ffffUL;
  45         p->flags = IORESOURCE_BUSY;
  46         request_resource(mem_res, p);
  47
  48         p = kzalloc(sizeof(*p), GFP_KERNEL);
  49         if (!p)
  50                 return;
  51
  52         p->name = "System ROM";
  53         p->start = mem_res->start + 0xf0000UL;
  54         p->end = p->start + 0xffffUL;
  55         p->flags = IORESOURCE_BUSY;
  56         request_resource(mem_res, p);
  57
  58         p = kzalloc(sizeof(*p), GFP_KERNEL);
  59         if (!p)
  60                 return;
  61
  62         p->name = "Video ROM";
  63         p->start = mem_res->start + 0xc0000UL;
  64         p->end = p->start + 0x7fffUL;
  65         p->flags = IORESOURCE_BUSY;
  66         request_resource(mem_res, p);
  67 }
  68
  69 static void pci_register_iommu_region(struct pci_pbm_info *pbm)
  70 {
  71         const u32 *vdma = of_get_property(pbm->prom_node, "virtual-dma", NULL);
  72
  73         if (vdma) {
  74                 struct resource *rp = kmalloc(sizeof(*rp), GFP_KERNEL);
  75
  76                 if (!rp) {
  77                         prom_printf("Cannot allocate IOMMU resource.\n");
  78                         prom_halt();
  79                 }
  80                 rp->name = "IOMMU";
  81                 rp->start = pbm->mem_space.start + (unsigned long) vdma[0];
  82                 rp->end = rp->start + (unsigned long) vdma[1] - 1UL;
  83                 rp->flags = IORESOURCE_BUSY;
  84                 request_resource(&pbm->mem_space, rp);
  85         }
  86 }
  87
  88 void pci_determine_mem_io_space(struct pci_pbm_info *pbm)
  89 {
  90         const struct linux_prom_pci_ranges *pbm_ranges;
  91         int i, saw_mem, saw_io;
  92         int num_pbm_ranges;
  93
  94         saw_mem = saw_io = 0;
  95         pbm_ranges = of_get_property(pbm->prom_node, "ranges", &i);
  96         num_pbm_ranges = i / sizeof(*pbm_ranges);
  97
  98         for (i = 0; i < num_pbm_ranges; i++) {
  99                 const struct linux_prom_pci_ranges *pr = &pbm_ranges[i];
 100                 unsigned long a;
 101                 u32 parent_phys_hi, parent_phys_lo;
 102                 int type;
 103
 104                 parent_phys_hi = pr->parent_phys_hi;
 105                 parent_phys_lo = pr->parent_phys_lo;
 106                 if (tlb_type == hypervisor)
 107                         parent_phys_hi &= 0x0fffffff;
 108
 109                 type = (pr->child_phys_hi >> 24) & 0x3;
 110                 a = (((unsigned long)parent_phys_hi << 32UL) |
 111                      ((unsigned long)parent_phys_lo  <<  0UL));
 112
 113                 switch (type) {
 114                 case 0:
 115                         /* PCI config space, 16MB */
 116                         pbm->config_space = a;
 117                         break;
 118
 119                 case 1:
 120                         /* 16-bit IO space, 16MB */
 121                         pbm->io_space.start = a;
 122                         pbm->io_space.end = a + ((16UL*1024UL*1024UL) - 1UL);
 123                         pbm->io_space.flags = IORESOURCE_IO;
 124                         saw_io = 1;
 125                         break;
 126
 127                 case 2:
 128                         /* 32-bit MEM space, 2GB */
 129                         pbm->mem_space.start = a;
 130                         pbm->mem_space.end = a + (0x80000000UL - 1UL);
 131                         pbm->mem_space.flags = IORESOURCE_MEM;
 132                         saw_mem = 1;
 133                         break;
 134
 135                 case 3:
 136                         /* XXX 64-bit MEM handling XXX */
 137
 138                 default:
 139                         break;
 140                 };
 141         }
 142
 143         if (!saw_io || !saw_mem) {
 144                 prom_printf("%s: Fatal error, missing %s PBM range.\n",
 145                             pbm->name,
 146                             (!saw_io ? "IO" : "MEM"));
 147                 prom_halt();
 148         }
 149
 150         printk("%s: PCI IO[%lx] MEM[%lx]\n",
 151                pbm->name,
 152                pbm->io_space.start,
 153                pbm->mem_space.start);
 154
 155         pbm->io_space.name = pbm->mem_space.name = pbm->name;
 156
 157         request_resource(&ioport_resource, &pbm->io_space);
 158         request_resource(&iomem_resource, &pbm->mem_space);
 159
 160         pci_register_legacy_regions(&pbm->io_space,
 161                                     &pbm->mem_space);
 162         pci_register_iommu_region(pbm);
 163 }
 164
 165 /* Generic helper routines for PCI error reporting. */
 166 void pci_scan_for_target_abort(struct pci_pbm_info *pbm,
 167                                struct pci_bus *pbus)
 168 {
 169         struct pci_dev *pdev;
 170         struct pci_bus *bus;
 171
 172         list_for_each_entry(pdev, &pbus->devices, bus_list) {
 173                 u16 status, error_bits;
 174
 175                 pci_read_config_word(pdev, PCI_STATUS, &status);
 176                 error_bits =
 177                         (status & (PCI_STATUS_SIG_TARGET_ABORT |
 178                                    PCI_STATUS_REC_TARGET_ABORT));
 179                 if (error_bits) {
 180                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
 181                         printk("%s: Device %s saw Target Abort [%016x]\n",
 182                                pbm->name, pci_name(pdev), status);
 183                 }
 184         }
 185
 186         list_for_each_entry(bus, &pbus->children, node)
 187                 pci_scan_for_target_abort(pbm, bus);
 188 }
 189
 190 void pci_scan_for_master_abort(struct pci_pbm_info *pbm,
 191                                struct pci_bus *pbus)
 192 {
 193         struct pci_dev *pdev;
 194         struct pci_bus *bus;
 195
 196         list_for_each_entry(pdev, &pbus->devices, bus_list) {
 197                 u16 status, error_bits;
 198
 199                 pci_read_config_word(pdev, PCI_STATUS, &status);
 200                 error_bits =
 201                         (status & (PCI_STATUS_REC_MASTER_ABORT));
 202                 if (error_bits) {
 203                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
 204                         printk("%s: Device %s received Master Abort [%016x]\n",
 205                                pbm->name, pci_name(pdev), status);
 206                 }
 207         }
 208
 209         list_for_each_entry(bus, &pbus->children, node)
 210                 pci_scan_for_master_abort(pbm, bus);
 211 }
 212
 213 void pci_scan_for_parity_error(struct pci_pbm_info *pbm,
 214                                struct pci_bus *pbus)
 215 {
 216         struct pci_dev *pdev;
 217         struct pci_bus *bus;
 218
 219         list_for_each_entry(pdev, &pbus->devices, bus_list) {
 220                 u16 status, error_bits;
 221
 222                 pci_read_config_word(pdev, PCI_STATUS, &status);
 223                 error_bits =
 224                         (status & (PCI_STATUS_PARITY |
 225                                    PCI_STATUS_DETECTED_PARITY));
 226                 if (error_bits) {
 227                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
 228                         printk("%s: Device %s saw Parity Error [%016x]\n",
 229                                pbm->name, pci_name(pdev), status);
 230                 }
 231         }
 232
 233         list_for_each_entry(bus, &pbus->children, node)
 234                 pci_scan_for_parity_error(pbm, bus);
 235 }