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