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   1 /* pci_sabre.c: Sabre specific PCI controller support.
   2  *
   3  * Copyright (C) 1997, 1998, 1999, 2007 David S. Miller (davem@davemloft.net)
   4  * Copyright (C) 1998, 1999 Eddie C. Dost   (ecd@skynet.be)
   5  * Copyright (C) 1999 Jakub Jelinek   (jakub@redhat.com)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/pci.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/of_device.h>
  15
  16 #include <asm/apb.h>
  17 #include <asm/iommu.h>
  18 #include <asm/irq.h>
  19 #include <asm/smp.h>
  20 #include <asm/oplib.h>
  21 #include <asm/prom.h>
  22
  23 #include "pci_impl.h"
  24 #include "iommu_common.h"
  25
  26 /* All SABRE registers are 64-bits.  The following accessor
  27  * routines are how they are accessed.  The REG parameter
  28  * is a physical address.
  29  */
  30 #define sabre_read(__reg) \
  31 ({      u64 __ret; \
  32         __asm__ __volatile__("ldxa [%1] %2, %0" \
  33                              : "=r" (__ret) \
  34                              : "r" (__reg), "i" (ASI_PHYS_BYPASS_EC_E) \
  35                              : "memory"); \
  36         __ret; \
  37 })
  38 #define sabre_write(__reg, __val) \
  39         __asm__ __volatile__("stxa %0, [%1] %2" \
  40                              : /* no outputs */ \
  41                              : "r" (__val), "r" (__reg), \
  42                                "i" (ASI_PHYS_BYPASS_EC_E) \
  43                              : "memory")
  44
  45 /* SABRE PCI controller register offsets and definitions. */
  46 #define SABRE_UE_AFSR           0x0030UL
  47 #define  SABRE_UEAFSR_PDRD       0x4000000000000000UL   /* Primary PCI DMA Read */
  48 #define  SABRE_UEAFSR_PDWR       0x2000000000000000UL   /* Primary PCI DMA Write */
  49 #define  SABRE_UEAFSR_SDRD       0x0800000000000000UL   /* Secondary PCI DMA Read */
  50 #define  SABRE_UEAFSR_SDWR       0x0400000000000000UL   /* Secondary PCI DMA Write */
  51 #define  SABRE_UEAFSR_SDTE       0x0200000000000000UL   /* Secondary DMA Translation Error */
  52 #define  SABRE_UEAFSR_PDTE       0x0100000000000000UL   /* Primary DMA Translation Error */
  53 #define  SABRE_UEAFSR_BMSK       0x0000ffff00000000UL   /* Bytemask */
  54 #define  SABRE_UEAFSR_OFF        0x00000000e0000000UL   /* Offset (AFAR bits [5:3] */
  55 #define  SABRE_UEAFSR_BLK        0x0000000000800000UL   /* Was block operation */
  56 #define SABRE_UECE_AFAR         0x0038UL
  57 #define SABRE_CE_AFSR           0x0040UL
  58 #define  SABRE_CEAFSR_PDRD       0x4000000000000000UL   /* Primary PCI DMA Read */
  59 #define  SABRE_CEAFSR_PDWR       0x2000000000000000UL   /* Primary PCI DMA Write */
  60 #define  SABRE_CEAFSR_SDRD       0x0800000000000000UL   /* Secondary PCI DMA Read */
  61 #define  SABRE_CEAFSR_SDWR       0x0400000000000000UL   /* Secondary PCI DMA Write */
  62 #define  SABRE_CEAFSR_ESYND      0x00ff000000000000UL   /* ECC Syndrome */
  63 #define  SABRE_CEAFSR_BMSK       0x0000ffff00000000UL   /* Bytemask */
  64 #define  SABRE_CEAFSR_OFF        0x00000000e0000000UL   /* Offset */
  65 #define  SABRE_CEAFSR_BLK        0x0000000000800000UL   /* Was block operation */
  66 #define SABRE_UECE_AFAR_ALIAS   0x0048UL        /* Aliases to 0x0038 */
  67 #define SABRE_IOMMU_CONTROL     0x0200UL
  68 #define  SABRE_IOMMUCTRL_ERRSTS  0x0000000006000000UL   /* Error status bits */
  69 #define  SABRE_IOMMUCTRL_ERR     0x0000000001000000UL   /* Error present in IOTLB */
  70 #define  SABRE_IOMMUCTRL_LCKEN   0x0000000000800000UL   /* IOTLB lock enable */
  71 #define  SABRE_IOMMUCTRL_LCKPTR  0x0000000000780000UL   /* IOTLB lock pointer */
  72 #define  SABRE_IOMMUCTRL_TSBSZ   0x0000000000070000UL   /* TSB Size */
  73 #define  SABRE_IOMMU_TSBSZ_1K   0x0000000000000000
  74 #define  SABRE_IOMMU_TSBSZ_2K   0x0000000000010000
  75 #define  SABRE_IOMMU_TSBSZ_4K   0x0000000000020000
  76 #define  SABRE_IOMMU_TSBSZ_8K   0x0000000000030000
  77 #define  SABRE_IOMMU_TSBSZ_16K  0x0000000000040000
  78 #define  SABRE_IOMMU_TSBSZ_32K  0x0000000000050000
  79 #define  SABRE_IOMMU_TSBSZ_64K  0x0000000000060000
  80 #define  SABRE_IOMMU_TSBSZ_128K 0x0000000000070000
  81 #define  SABRE_IOMMUCTRL_TBWSZ   0x0000000000000004UL   /* TSB assumed page size */
  82 #define  SABRE_IOMMUCTRL_DENAB   0x0000000000000002UL   /* Diagnostic Mode Enable */
  83 #define  SABRE_IOMMUCTRL_ENAB    0x0000000000000001UL   /* IOMMU Enable */
  84 #define SABRE_IOMMU_TSBBASE     0x0208UL
  85 #define SABRE_IOMMU_FLUSH       0x0210UL
  86 #define SABRE_IMAP_A_SLOT0      0x0c00UL
  87 #define SABRE_IMAP_B_SLOT0      0x0c20UL
  88 #define SABRE_IMAP_SCSI         0x1000UL
  89 #define SABRE_IMAP_ETH          0x1008UL
  90 #define SABRE_IMAP_BPP          0x1010UL
  91 #define SABRE_IMAP_AU_REC       0x1018UL
  92 #define SABRE_IMAP_AU_PLAY      0x1020UL
  93 #define SABRE_IMAP_PFAIL        0x1028UL
  94 #define SABRE_IMAP_KMS          0x1030UL
  95 #define SABRE_IMAP_FLPY         0x1038UL
  96 #define SABRE_IMAP_SHW          0x1040UL
  97 #define SABRE_IMAP_KBD          0x1048UL
  98 #define SABRE_IMAP_MS           0x1050UL
  99 #define SABRE_IMAP_SER          0x1058UL
 100 #define SABRE_IMAP_UE           0x1070UL
 101 #define SABRE_IMAP_CE           0x1078UL
 102 #define SABRE_IMAP_PCIERR       0x1080UL
 103 #define SABRE_IMAP_GFX          0x1098UL
 104 #define SABRE_IMAP_EUPA         0x10a0UL
 105 #define SABRE_ICLR_A_SLOT0      0x1400UL
 106 #define SABRE_ICLR_B_SLOT0      0x1480UL
 107 #define SABRE_ICLR_SCSI         0x1800UL
 108 #define SABRE_ICLR_ETH          0x1808UL
 109 #define SABRE_ICLR_BPP          0x1810UL
 110 #define SABRE_ICLR_AU_REC       0x1818UL
 111 #define SABRE_ICLR_AU_PLAY      0x1820UL
 112 #define SABRE_ICLR_PFAIL        0x1828UL
 113 #define SABRE_ICLR_KMS          0x1830UL
 114 #define SABRE_ICLR_FLPY         0x1838UL
 115 #define SABRE_ICLR_SHW          0x1840UL
 116 #define SABRE_ICLR_KBD          0x1848UL
 117 #define SABRE_ICLR_MS           0x1850UL
 118 #define SABRE_ICLR_SER          0x1858UL
 119 #define SABRE_ICLR_UE           0x1870UL
 120 #define SABRE_ICLR_CE           0x1878UL
 121 #define SABRE_ICLR_PCIERR       0x1880UL
 122 #define SABRE_WRSYNC            0x1c20UL
 123 #define SABRE_PCICTRL           0x2000UL
 124 #define  SABRE_PCICTRL_MRLEN     0x0000001000000000UL   /* Use MemoryReadLine for block loads/stores */
 125 #define  SABRE_PCICTRL_SERR      0x0000000400000000UL   /* Set when SERR asserted on PCI bus */
 126 #define  SABRE_PCICTRL_ARBPARK   0x0000000000200000UL   /* Bus Parking 0=Ultra-IIi 1=prev-bus-owner */
 127 #define  SABRE_PCICTRL_CPUPRIO   0x0000000000100000UL   /* Ultra-IIi granted every other bus cycle */
 128 #define  SABRE_PCICTRL_ARBPRIO   0x00000000000f0000UL   /* Slot which is granted every other bus cycle */
 129 #define  SABRE_PCICTRL_ERREN     0x0000000000000100UL   /* PCI Error Interrupt Enable */
 130 #define  SABRE_PCICTRL_RTRYWE    0x0000000000000080UL   /* DMA Flow Control 0=wait-if-possible 1=retry */
 131 #define  SABRE_PCICTRL_AEN       0x000000000000000fUL   /* Slot PCI arbitration enables */
 132 #define SABRE_PIOAFSR           0x2010UL
 133 #define  SABRE_PIOAFSR_PMA       0x8000000000000000UL   /* Primary Master Abort */
 134 #define  SABRE_PIOAFSR_PTA       0x4000000000000000UL   /* Primary Target Abort */
 135 #define  SABRE_PIOAFSR_PRTRY     0x2000000000000000UL   /* Primary Excessive Retries */
 136 #define  SABRE_PIOAFSR_PPERR     0x1000000000000000UL   /* Primary Parity Error */
 137 #define  SABRE_PIOAFSR_SMA       0x0800000000000000UL   /* Secondary Master Abort */
 138 #define  SABRE_PIOAFSR_STA       0x0400000000000000UL   /* Secondary Target Abort */
 139 #define  SABRE_PIOAFSR_SRTRY     0x0200000000000000UL   /* Secondary Excessive Retries */
 140 #define  SABRE_PIOAFSR_SPERR     0x0100000000000000UL   /* Secondary Parity Error */
 141 #define  SABRE_PIOAFSR_BMSK      0x0000ffff00000000UL   /* Byte Mask */
 142 #define  SABRE_PIOAFSR_BLK       0x0000000080000000UL   /* Was Block Operation */
 143 #define SABRE_PIOAFAR           0x2018UL
 144 #define SABRE_PCIDIAG           0x2020UL
 145 #define  SABRE_PCIDIAG_DRTRY     0x0000000000000040UL   /* Disable PIO Retry Limit */
 146 #define  SABRE_PCIDIAG_IPAPAR    0x0000000000000008UL   /* Invert PIO Address Parity */
 147 #define  SABRE_PCIDIAG_IPDPAR    0x0000000000000004UL   /* Invert PIO Data Parity */
 148 #define  SABRE_PCIDIAG_IDDPAR    0x0000000000000002UL   /* Invert DMA Data Parity */
 149 #define  SABRE_PCIDIAG_ELPBK     0x0000000000000001UL   /* Loopback Enable - not supported */
 150 #define SABRE_PCITASR           0x2028UL
 151 #define  SABRE_PCITASR_EF        0x0000000000000080UL   /* Respond to 0xe0000000-0xffffffff */
 152 #define  SABRE_PCITASR_CD        0x0000000000000040UL   /* Respond to 0xc0000000-0xdfffffff */
 153 #define  SABRE_PCITASR_AB        0x0000000000000020UL   /* Respond to 0xa0000000-0xbfffffff */
 154 #define  SABRE_PCITASR_89        0x0000000000000010UL   /* Respond to 0x80000000-0x9fffffff */
 155 #define  SABRE_PCITASR_67        0x0000000000000008UL   /* Respond to 0x60000000-0x7fffffff */
 156 #define  SABRE_PCITASR_45        0x0000000000000004UL   /* Respond to 0x40000000-0x5fffffff */
 157 #define  SABRE_PCITASR_23        0x0000000000000002UL   /* Respond to 0x20000000-0x3fffffff */
 158 #define  SABRE_PCITASR_01        0x0000000000000001UL   /* Respond to 0x00000000-0x1fffffff */
 159 #define SABRE_PIOBUF_DIAG       0x5000UL
 160 #define SABRE_DMABUF_DIAGLO     0x5100UL
 161 #define SABRE_DMABUF_DIAGHI     0x51c0UL
 162 #define SABRE_IMAP_GFX_ALIAS    0x6000UL        /* Aliases to 0x1098 */
 163 #define SABRE_IMAP_EUPA_ALIAS   0x8000UL        /* Aliases to 0x10a0 */
 164 #define SABRE_IOMMU_VADIAG      0xa400UL
 165 #define SABRE_IOMMU_TCDIAG      0xa408UL
 166 #define SABRE_IOMMU_TAG         0xa580UL
 167 #define  SABRE_IOMMUTAG_ERRSTS   0x0000000001800000UL   /* Error status bits */
 168 #define  SABRE_IOMMUTAG_ERR      0x0000000000400000UL   /* Error present */
 169 #define  SABRE_IOMMUTAG_WRITE    0x0000000000200000UL   /* Page is writable */
 170 #define  SABRE_IOMMUTAG_STREAM   0x0000000000100000UL   /* Streamable bit - unused */
 171 #define  SABRE_IOMMUTAG_SIZE     0x0000000000080000UL   /* 0=8k 1=16k */
 172 #define  SABRE_IOMMUTAG_VPN      0x000000000007ffffUL   /* Virtual Page Number [31:13] */
 173 #define SABRE_IOMMU_DATA        0xa600UL
 174 #define SABRE_IOMMUDATA_VALID    0x0000000040000000UL   /* Valid */
 175 #define SABRE_IOMMUDATA_USED     0x0000000020000000UL   /* Used (for LRU algorithm) */
 176 #define SABRE_IOMMUDATA_CACHE    0x0000000010000000UL   /* Cacheable */
 177 #define SABRE_IOMMUDATA_PPN      0x00000000001fffffUL   /* Physical Page Number [33:13] */
 178 #define SABRE_PCI_IRQSTATE      0xa800UL
 179 #define SABRE_OBIO_IRQSTATE     0xa808UL
 180 #define SABRE_FFBCFG            0xf000UL
 181 #define  SABRE_FFBCFG_SPRQS      0x000000000f000000     /* Slave P_RQST queue size */
 182 #define  SABRE_FFBCFG_ONEREAD    0x0000000000004000     /* Slave supports one outstanding read */
 183 #define SABRE_MCCTRL0           0xf010UL
 184 #define  SABRE_MCCTRL0_RENAB     0x0000000080000000     /* Refresh Enable */
 185 #define  SABRE_MCCTRL0_EENAB     0x0000000010000000     /* Enable all ECC functions */
 186 #define  SABRE_MCCTRL0_11BIT     0x0000000000001000     /* Enable 11-bit column addressing */
 187 #define  SABRE_MCCTRL0_DPP       0x0000000000000f00     /* DIMM Pair Present Bits */
 188 #define  SABRE_MCCTRL0_RINTVL    0x00000000000000ff     /* Refresh Interval */
 189 #define SABRE_MCCTRL1           0xf018UL
 190 #define  SABRE_MCCTRL1_AMDC      0x0000000038000000     /* Advance Memdata Clock */
 191 #define  SABRE_MCCTRL1_ARDC      0x0000000007000000     /* Advance DRAM Read Data Clock */
 192 #define  SABRE_MCCTRL1_CSR       0x0000000000e00000     /* CAS to RAS delay for CBR refresh */
 193 #define  SABRE_MCCTRL1_CASRW     0x00000000001c0000     /* CAS length for read/write */
 194 #define  SABRE_MCCTRL1_RCD       0x0000000000038000     /* RAS to CAS delay */
 195 #define  SABRE_MCCTRL1_CP        0x0000000000007000     /* CAS Precharge */
 196 #define  SABRE_MCCTRL1_RP        0x0000000000000e00     /* RAS Precharge */
 197 #define  SABRE_MCCTRL1_RAS       0x00000000000001c0     /* Length of RAS for refresh */
 198 #define  SABRE_MCCTRL1_CASRW2    0x0000000000000038     /* Must be same as CASRW */
 199 #define  SABRE_MCCTRL1_RSC       0x0000000000000007     /* RAS after CAS hold time */
 200 #define SABRE_RESETCTRL         0xf020UL
 201
 202 #define SABRE_CONFIGSPACE       0x001000000UL
 203 #define SABRE_IOSPACE           0x002000000UL
 204 #define SABRE_IOSPACE_SIZE      0x000ffffffUL
 205 #define SABRE_MEMSPACE          0x100000000UL
 206 #define SABRE_MEMSPACE_SIZE     0x07fffffffUL
 207
 208 static int hummingbird_p;
 209 static struct pci_bus *sabre_root_bus;
 210
 211 /* SABRE error handling support. */
 212 static void sabre_check_iommu_error(struct pci_pbm_info *pbm,
 213                                     unsigned long afsr,
 214                                     unsigned long afar)
 215 {
 216         struct iommu *iommu = pbm->iommu;
 217         unsigned long iommu_tag[16];
 218         unsigned long iommu_data[16];
 219         unsigned long flags;
 220         u64 control;
 221         int i;
 222
 223         spin_lock_irqsave(&iommu->lock, flags);
 224         control = sabre_read(iommu->iommu_control);
 225         if (control & SABRE_IOMMUCTRL_ERR) {
 226                 char *type_string;
 227
 228                 /* Clear the error encountered bit.
 229                  * NOTE: On Sabre this is write 1 to clear,
 230                  *       which is different from Psycho.
 231                  */
 232                 sabre_write(iommu->iommu_control, control);
 233                 switch((control & SABRE_IOMMUCTRL_ERRSTS) >> 25UL) {
 234                 case 1:
 235                         type_string = "Invalid Error";
 236                         break;
 237                 case 3:
 238                         type_string = "ECC Error";
 239                         break;
 240                 default:
 241                         type_string = "Unknown";
 242                         break;
 243                 };
 244                 printk("%s: IOMMU Error, type[%s]\n",
 245                        pbm->name, type_string);
 246
 247                 /* Enter diagnostic mode and probe for error'd
 248                  * entries in the IOTLB.
 249                  */
 250                 control &= ~(SABRE_IOMMUCTRL_ERRSTS | SABRE_IOMMUCTRL_ERR);
 251                 sabre_write(iommu->iommu_control,
 252                             (control | SABRE_IOMMUCTRL_DENAB));
 253                 for (i = 0; i < 16; i++) {
 254                         unsigned long base = pbm->controller_regs;
 255
 256                         iommu_tag[i] =
 257                                 sabre_read(base + SABRE_IOMMU_TAG + (i * 8UL));
 258                         iommu_data[i] =
 259                                 sabre_read(base + SABRE_IOMMU_DATA + (i * 8UL));
 260                         sabre_write(base + SABRE_IOMMU_TAG + (i * 8UL), 0);
 261                         sabre_write(base + SABRE_IOMMU_DATA + (i * 8UL), 0);
 262                 }
 263                 sabre_write(iommu->iommu_control, control);
 264
 265                 for (i = 0; i < 16; i++) {
 266                         unsigned long tag, data;
 267
 268                         tag = iommu_tag[i];
 269                         if (!(tag & SABRE_IOMMUTAG_ERR))
 270                                 continue;
 271
 272                         data = iommu_data[i];
 273                         switch((tag & SABRE_IOMMUTAG_ERRSTS) >> 23UL) {
 274                         case 1:
 275                                 type_string = "Invalid Error";
 276                                 break;
 277                         case 3:
 278                                 type_string = "ECC Error";
 279                                 break;
 280                         default:
 281                                 type_string = "Unknown";
 282                                 break;
 283                         };
 284                         printk("%s: IOMMU TAG(%d)[RAW(%016lx)error(%s)wr(%d)sz(%dK)vpg(%08lx)]\n",
 285                                pbm->name, i, tag, type_string,
 286                                ((tag & SABRE_IOMMUTAG_WRITE) ? 1 : 0),
 287                                ((tag & SABRE_IOMMUTAG_SIZE) ? 64 : 8),
 288                                ((tag & SABRE_IOMMUTAG_VPN) << IOMMU_PAGE_SHIFT));
 289                         printk("%s: IOMMU DATA(%d)[RAW(%016lx)valid(%d)used(%d)cache(%d)ppg(%016lx)\n",
 290                                pbm->name, i, data,
 291                                ((data & SABRE_IOMMUDATA_VALID) ? 1 : 0),
 292                                ((data & SABRE_IOMMUDATA_USED) ? 1 : 0),
 293                                ((data & SABRE_IOMMUDATA_CACHE) ? 1 : 0),
 294                                ((data & SABRE_IOMMUDATA_PPN) << IOMMU_PAGE_SHIFT));
 295                 }
 296         }
 297         spin_unlock_irqrestore(&iommu->lock, flags);
 298 }
 299
 300 static irqreturn_t sabre_ue_intr(int irq, void *dev_id)
 301 {
 302         struct pci_pbm_info *pbm = dev_id;
 303         unsigned long afsr_reg = pbm->controller_regs + SABRE_UE_AFSR;
 304         unsigned long afar_reg = pbm->controller_regs + SABRE_UECE_AFAR;
 305         unsigned long afsr, afar, error_bits;
 306         int reported;
 307
 308         /* Latch uncorrectable error status. */
 309         afar = sabre_read(afar_reg);
 310         afsr = sabre_read(afsr_reg);
 311
 312         /* Clear the primary/secondary error status bits. */
 313         error_bits = afsr &
 314                 (SABRE_UEAFSR_PDRD | SABRE_UEAFSR_PDWR |
 315                  SABRE_UEAFSR_SDRD | SABRE_UEAFSR_SDWR |
 316                  SABRE_UEAFSR_SDTE | SABRE_UEAFSR_PDTE);
 317         if (!error_bits)
 318                 return IRQ_NONE;
 319         sabre_write(afsr_reg, error_bits);
 320
 321         /* Log the error. */
 322         printk("%s: Uncorrectable Error, primary error type[%s%s]\n",
 323                pbm->name,
 324                ((error_bits & SABRE_UEAFSR_PDRD) ?
 325                 "DMA Read" :
 326                 ((error_bits & SABRE_UEAFSR_PDWR) ?
 327                  "DMA Write" : "???")),
 328                ((error_bits & SABRE_UEAFSR_PDTE) ?
 329                 ":Translation Error" : ""));
 330         printk("%s: bytemask[%04lx] dword_offset[%lx] was_block(%d)\n",
 331                pbm->name,
 332                (afsr & SABRE_UEAFSR_BMSK) >> 32UL,
 333                (afsr & SABRE_UEAFSR_OFF) >> 29UL,
 334                ((afsr & SABRE_UEAFSR_BLK) ? 1 : 0));
 335         printk("%s: UE AFAR [%016lx]\n", pbm->name, afar);
 336         printk("%s: UE Secondary errors [", pbm->name);
 337         reported = 0;
 338         if (afsr & SABRE_UEAFSR_SDRD) {
 339                 reported++;
 340                 printk("(DMA Read)");
 341         }
 342         if (afsr & SABRE_UEAFSR_SDWR) {
 343                 reported++;
 344                 printk("(DMA Write)");
 345         }
 346         if (afsr & SABRE_UEAFSR_SDTE) {
 347                 reported++;
 348                 printk("(Translation Error)");
 349         }
 350         if (!reported)
 351                 printk("(none)");
 352         printk("]\n");
 353
 354         /* Interrogate IOMMU for error status. */
 355         sabre_check_iommu_error(pbm, afsr, afar);
 356
 357         return IRQ_HANDLED;
 358 }
 359
 360 static irqreturn_t sabre_ce_intr(int irq, void *dev_id)
 361 {
 362         struct pci_pbm_info *pbm = dev_id;
 363         unsigned long afsr_reg = pbm->controller_regs + SABRE_CE_AFSR;
 364         unsigned long afar_reg = pbm->controller_regs + SABRE_UECE_AFAR;
 365         unsigned long afsr, afar, error_bits;
 366         int reported;
 367
 368         /* Latch error status. */
 369         afar = sabre_read(afar_reg);
 370         afsr = sabre_read(afsr_reg);
 371
 372         /* Clear primary/secondary error status bits. */
 373         error_bits = afsr &
 374                 (SABRE_CEAFSR_PDRD | SABRE_CEAFSR_PDWR |
 375                  SABRE_CEAFSR_SDRD | SABRE_CEAFSR_SDWR);
 376         if (!error_bits)
 377                 return IRQ_NONE;
 378         sabre_write(afsr_reg, error_bits);
 379
 380         /* Log the error. */
 381         printk("%s: Correctable Error, primary error type[%s]\n",
 382                pbm->name,
 383                ((error_bits & SABRE_CEAFSR_PDRD) ?
 384                 "DMA Read" :
 385                 ((error_bits & SABRE_CEAFSR_PDWR) ?
 386                  "DMA Write" : "???")));
 387
 388         /* XXX Use syndrome and afar to print out module string just like
 389          * XXX UDB CE trap handler does... -DaveM
 390          */
 391         printk("%s: syndrome[%02lx] bytemask[%04lx] dword_offset[%lx] "
 392                "was_block(%d)\n",
 393                pbm->name,
 394                (afsr & SABRE_CEAFSR_ESYND) >> 48UL,
 395                (afsr & SABRE_CEAFSR_BMSK) >> 32UL,
 396                (afsr & SABRE_CEAFSR_OFF) >> 29UL,
 397                ((afsr & SABRE_CEAFSR_BLK) ? 1 : 0));
 398         printk("%s: CE AFAR [%016lx]\n", pbm->name, afar);
 399         printk("%s: CE Secondary errors [", pbm->name);
 400         reported = 0;
 401         if (afsr & SABRE_CEAFSR_SDRD) {
 402                 reported++;
 403                 printk("(DMA Read)");
 404         }
 405         if (afsr & SABRE_CEAFSR_SDWR) {
 406                 reported++;
 407                 printk("(DMA Write)");
 408         }
 409         if (!reported)
 410                 printk("(none)");
 411         printk("]\n");
 412
 413         return IRQ_HANDLED;
 414 }
 415
 416 static irqreturn_t sabre_pcierr_intr_other(struct pci_pbm_info *pbm)
 417 {
 418         unsigned long csr_reg, csr, csr_error_bits;
 419         irqreturn_t ret = IRQ_NONE;
 420         u16 stat;
 421
 422         csr_reg = pbm->controller_regs + SABRE_PCICTRL;
 423         csr = sabre_read(csr_reg);
 424         csr_error_bits =
 425                 csr & SABRE_PCICTRL_SERR;
 426         if (csr_error_bits) {
 427                 /* Clear the errors.  */
 428                 sabre_write(csr_reg, csr);
 429
 430                 /* Log 'em.  */
 431                 if (csr_error_bits & SABRE_PCICTRL_SERR)
 432                         printk("%s: PCI SERR signal asserted.\n",
 433                                pbm->name);
 434                 ret = IRQ_HANDLED;
 435         }
 436         pci_bus_read_config_word(sabre_root_bus, 0,
 437                                  PCI_STATUS, &stat);
 438         if (stat & (PCI_STATUS_PARITY |
 439                     PCI_STATUS_SIG_TARGET_ABORT |
 440                     PCI_STATUS_REC_TARGET_ABORT |
 441                     PCI_STATUS_REC_MASTER_ABORT |
 442                     PCI_STATUS_SIG_SYSTEM_ERROR)) {
 443                 printk("%s: PCI bus error, PCI_STATUS[%04x]\n",
 444                        pbm->name, stat);
 445                 pci_bus_write_config_word(sabre_root_bus, 0,
 446                                           PCI_STATUS, 0xffff);
 447                 ret = IRQ_HANDLED;
 448         }
 449         return ret;
 450 }
 451
 452 static irqreturn_t sabre_pcierr_intr(int irq, void *dev_id)
 453 {
 454         struct pci_pbm_info *pbm = dev_id;
 455         unsigned long afsr_reg, afar_reg;
 456         unsigned long afsr, afar, error_bits;
 457         int reported;
 458
 459         afsr_reg = pbm->controller_regs + SABRE_PIOAFSR;
 460         afar_reg = pbm->controller_regs + SABRE_PIOAFAR;
 461
 462         /* Latch error status. */
 463         afar = sabre_read(afar_reg);
 464         afsr = sabre_read(afsr_reg);
 465
 466         /* Clear primary/secondary error status bits. */
 467         error_bits = afsr &
 468                 (SABRE_PIOAFSR_PMA | SABRE_PIOAFSR_PTA |
 469                  SABRE_PIOAFSR_PRTRY | SABRE_PIOAFSR_PPERR |
 470                  SABRE_PIOAFSR_SMA | SABRE_PIOAFSR_STA |
 471                  SABRE_PIOAFSR_SRTRY | SABRE_PIOAFSR_SPERR);
 472         if (!error_bits)
 473                 return sabre_pcierr_intr_other(pbm);
 474         sabre_write(afsr_reg, error_bits);
 475
 476         /* Log the error. */
 477         printk("%s: PCI Error, primary error type[%s]\n",
 478                pbm->name,
 479                (((error_bits & SABRE_PIOAFSR_PMA) ?
 480                  "Master Abort" :
 481                  ((error_bits & SABRE_PIOAFSR_PTA) ?
 482                   "Target Abort" :
 483                   ((error_bits & SABRE_PIOAFSR_PRTRY) ?
 484                    "Excessive Retries" :
 485                    ((error_bits & SABRE_PIOAFSR_PPERR) ?
 486                     "Parity Error" : "???"))))));
 487         printk("%s: bytemask[%04lx] was_block(%d)\n",
 488                pbm->name,
 489                (afsr & SABRE_PIOAFSR_BMSK) >> 32UL,
 490                (afsr & SABRE_PIOAFSR_BLK) ? 1 : 0);
 491         printk("%s: PCI AFAR [%016lx]\n", pbm->name, afar);
 492         printk("%s: PCI Secondary errors [", pbm->name);
 493         reported = 0;
 494         if (afsr & SABRE_PIOAFSR_SMA) {
 495                 reported++;
 496                 printk("(Master Abort)");
 497         }
 498         if (afsr & SABRE_PIOAFSR_STA) {
 499                 reported++;
 500                 printk("(Target Abort)");
 501         }
 502         if (afsr & SABRE_PIOAFSR_SRTRY) {
 503                 reported++;
 504                 printk("(Excessive Retries)");
 505         }
 506         if (afsr & SABRE_PIOAFSR_SPERR) {
 507                 reported++;
 508                 printk("(Parity Error)");
 509         }
 510         if (!reported)
 511                 printk("(none)");
 512         printk("]\n");
 513
 514         /* For the error types shown, scan both PCI buses for devices
 515          * which have logged that error type.
 516          */
 517
 518         /* If we see a Target Abort, this could be the result of an
 519          * IOMMU translation error of some sort.  It is extremely
 520          * useful to log this information as usually it indicates
 521          * a bug in the IOMMU support code or a PCI device driver.
 522          */
 523         if (error_bits & (SABRE_PIOAFSR_PTA | SABRE_PIOAFSR_STA)) {
 524                 sabre_check_iommu_error(pbm, afsr, afar);
 525                 pci_scan_for_target_abort(pbm, pbm->pci_bus);
 526         }
 527         if (error_bits & (SABRE_PIOAFSR_PMA | SABRE_PIOAFSR_SMA))
 528                 pci_scan_for_master_abort(pbm, pbm->pci_bus);
 529
 530         /* For excessive retries, SABRE/PBM will abort the device
 531          * and there is no way to specifically check for excessive
 532          * retries in the config space status registers.  So what
 533          * we hope is that we'll catch it via the master/target
 534          * abort events.
 535          */
 536
 537         if (error_bits & (SABRE_PIOAFSR_PPERR | SABRE_PIOAFSR_SPERR))
 538                 pci_scan_for_parity_error(pbm, pbm->pci_bus);
 539
 540         return IRQ_HANDLED;
 541 }
 542
 543 static void sabre_register_error_handlers(struct pci_pbm_info *pbm)
 544 {
 545         struct device_node *dp = pbm->prom_node;
 546         struct of_device *op;
 547         unsigned long base = pbm->controller_regs;
 548         u64 tmp;
 549         int err;
 550
 551         if (pbm->chip_type == PBM_CHIP_TYPE_SABRE)
 552                 dp = dp->parent;
 553
 554         op = of_find_device_by_node(dp);
 555         if (!op)
 556                 return;
 557
 558         /* Sabre/Hummingbird IRQ property layout is:
 559          * 0: PCI ERR
 560          * 1: UE ERR
 561          * 2: CE ERR
 562          * 3: POWER FAIL
 563          */
 564         if (op->num_irqs < 4)
 565                 return;
 566
 567         /* We clear the error bits in the appropriate AFSR before
 568          * registering the handler so that we don't get spurious
 569          * interrupts.
 570          */
 571         sabre_write(base + SABRE_UE_AFSR,
 572                     (SABRE_UEAFSR_PDRD | SABRE_UEAFSR_PDWR |
 573                      SABRE_UEAFSR_SDRD | SABRE_UEAFSR_SDWR |
 574                      SABRE_UEAFSR_SDTE | SABRE_UEAFSR_PDTE));
 575
 576         err = request_irq(op->irqs[1], sabre_ue_intr, 0, "SABRE_UE", pbm);
 577         if (err)
 578                 printk(KERN_WARNING "%s: Couldn't register UE, err=%d.\n",
 579                        pbm->name, err);
 580
 581         sabre_write(base + SABRE_CE_AFSR,
 582                     (SABRE_CEAFSR_PDRD | SABRE_CEAFSR_PDWR |
 583                      SABRE_CEAFSR_SDRD | SABRE_CEAFSR_SDWR));
 584
 585         err = request_irq(op->irqs[2], sabre_ce_intr, 0, "SABRE_CE", pbm);
 586         if (err)
 587                 printk(KERN_WARNING "%s: Couldn't register CE, err=%d.\n",
 588                        pbm->name, err);
 589         err = request_irq(op->irqs[0], sabre_pcierr_intr, 0,
 590                           "SABRE_PCIERR", pbm);
 591         if (err)
 592                 printk(KERN_WARNING "%s: Couldn't register PCIERR, err=%d.\n",
 593                        pbm->name, err);
 594
 595         tmp = sabre_read(base + SABRE_PCICTRL);
 596         tmp |= SABRE_PCICTRL_ERREN;
 597         sabre_write(base + SABRE_PCICTRL, tmp);
 598 }
 599
 600 static void apb_init(struct pci_bus *sabre_bus)
 601 {
 602         struct pci_dev *pdev;
 603
 604         list_for_each_entry(pdev, &sabre_bus->devices, bus_list) {
 605                 if (pdev->vendor == PCI_VENDOR_ID_SUN &&
 606                     pdev->device == PCI_DEVICE_ID_SUN_SIMBA) {
 607                         u16 word16;
 608
 609                         pci_read_config_word(pdev, PCI_COMMAND, &word16);
 610                         word16 |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY |
 611                                 PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY |
 612                                 PCI_COMMAND_IO;
 613                         pci_write_config_word(pdev, PCI_COMMAND, word16);
 614
 615                         /* Status register bits are "write 1 to clear". */
 616                         pci_write_config_word(pdev, PCI_STATUS, 0xffff);
 617                         pci_write_config_word(pdev, PCI_SEC_STATUS, 0xffff);
 618
 619                         /* Use a primary/seconday latency timer value
 620                          * of 64.
 621                          */
 622                         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
 623                         pci_write_config_byte(pdev, PCI_SEC_LATENCY_TIMER, 64);
 624
 625                         /* Enable reporting/forwarding of master aborts,
 626                          * parity, and SERR.
 627                          */
 628                         pci_write_config_byte(pdev, PCI_BRIDGE_CONTROL,
 629                                               (PCI_BRIDGE_CTL_PARITY |
 630                                                PCI_BRIDGE_CTL_SERR |
 631                                                PCI_BRIDGE_CTL_MASTER_ABORT));
 632                 }
 633         }
 634 }
 635
 636 static void __init sabre_scan_bus(struct pci_pbm_info *pbm)
 637 {
 638         static int once;
 639
 640         /* The APB bridge speaks to the Sabre host PCI bridge
 641          * at 66Mhz, but the front side of APB runs at 33Mhz
 642          * for both segments.
 643          *
 644          * Hummingbird systems do not use APB, so they run
 645          * at 66MHZ.
 646          */
 647         if (hummingbird_p)
 648                 pbm->is_66mhz_capable = 1;
 649         else
 650                 pbm->is_66mhz_capable = 0;
 651
 652         /* This driver has not been verified to handle
 653          * multiple SABREs yet, so trap this.
 654          *
 655          * Also note that the SABRE host bridge is hardwired
 656          * to live at bus 0.
 657          */
 658         if (once != 0) {
 659                 prom_printf("SABRE: Multiple controllers unsupported.\n");
 660                 prom_halt();
 661         }
 662         once++;
 663
 664         pbm->pci_bus = pci_scan_one_pbm(pbm);
 665         if (!pbm->pci_bus)
 666                 return;
 667
 668         sabre_root_bus = pbm->pci_bus;
 669
 670         apb_init(pbm->pci_bus);
 671
 672         sabre_register_error_handlers(pbm);
 673 }
 674
 675 static int sabre_iommu_init(struct pci_pbm_info *pbm,
 676                             int tsbsize, unsigned long dvma_offset,
 677                             u32 dma_mask)
 678 {
 679         struct iommu *iommu = pbm->iommu;
 680         unsigned long i;
 681         u64 control;
 682         int err;
 683
 684         /* Register addresses. */
 685         iommu->iommu_control  = pbm->controller_regs + SABRE_IOMMU_CONTROL;
 686         iommu->iommu_tsbbase  = pbm->controller_regs + SABRE_IOMMU_TSBBASE;
 687         iommu->iommu_flush    = pbm->controller_regs + SABRE_IOMMU_FLUSH;
 688         iommu->iommu_tags     = iommu->iommu_flush + (0xa580UL - 0x0210UL);
 689         iommu->write_complete_reg = pbm->controller_regs + SABRE_WRSYNC;
 690         /* Sabre's IOMMU lacks ctx flushing. */
 691         iommu->iommu_ctxflush = 0;
 692
 693         /* Invalidate TLB Entries. */
 694         control = sabre_read(pbm->controller_regs + SABRE_IOMMU_CONTROL);
 695         control |= SABRE_IOMMUCTRL_DENAB;
 696         sabre_write(pbm->controller_regs + SABRE_IOMMU_CONTROL, control);
 697
 698         for(i = 0; i < 16; i++) {
 699                 sabre_write(pbm->controller_regs + SABRE_IOMMU_TAG + (i * 8UL), 0);
 700                 sabre_write(pbm->controller_regs + SABRE_IOMMU_DATA + (i * 8UL), 0);
 701         }
 702
 703         /* Leave diag mode enabled for full-flushing done
 704          * in pci_iommu.c
 705          */
 706         err = iommu_table_init(iommu, tsbsize * 1024 * 8,
 707                                dvma_offset, dma_mask, pbm->numa_node);
 708         if (err)
 709                 return err;
 710
 711         sabre_write(pbm->controller_regs + SABRE_IOMMU_TSBBASE,
 712                     __pa(iommu->page_table));
 713
 714         control = sabre_read(pbm->controller_regs + SABRE_IOMMU_CONTROL);
 715         control &= ~(SABRE_IOMMUCTRL_TSBSZ | SABRE_IOMMUCTRL_TBWSZ);
 716         control |= SABRE_IOMMUCTRL_ENAB;
 717         switch(tsbsize) {
 718         case 64:
 719                 control |= SABRE_IOMMU_TSBSZ_64K;
 720                 break;
 721         case 128:
 722                 control |= SABRE_IOMMU_TSBSZ_128K;
 723                 break;
 724         default:
 725                 prom_printf("iommu_init: Illegal TSB size %d\n", tsbsize);
 726                 prom_halt();
 727                 break;
 728         }
 729         sabre_write(pbm->controller_regs + SABRE_IOMMU_CONTROL, control);
 730
 731         return 0;
 732 }
 733
 734 static void __init sabre_pbm_init(struct pci_controller_info *p,
 735                                   struct pci_pbm_info *pbm, struct device_node *dp)
 736 {
 737         pbm->name = dp->full_name;
 738         printk("%s: SABRE PCI Bus Module\n", pbm->name);
 739
 740         pbm->numa_node = -1;
 741
 742         pbm->scan_bus = sabre_scan_bus;
 743         pbm->pci_ops = &sun4u_pci_ops;
 744         pbm->config_space_reg_bits = 8;
 745
 746         pbm->index = pci_num_pbms++;
 747
 748         pbm->chip_type = PBM_CHIP_TYPE_SABRE;
 749         pbm->parent = p;
 750         pbm->prom_node = dp;
 751         pci_get_pbm_props(pbm);
 752
 753         pci_determine_mem_io_space(pbm);
 754 }
 755
 756 void __init sabre_init(struct device_node *dp, char *model_name)
 757 {
 758         const struct linux_prom64_registers *pr_regs;
 759         struct pci_controller_info *p;
 760         struct pci_pbm_info *pbm;
 761         struct iommu *iommu;
 762         int tsbsize;
 763         const u32 *vdma;
 764         u32 upa_portid, dma_mask;
 765         u64 clear_irq;
 766
 767         hummingbird_p = 0;
 768         if (!strcmp(model_name, "pci108e,a001"))
 769                 hummingbird_p = 1;
 770         else if (!strcmp(model_name, "SUNW,sabre")) {
 771                 const char *compat = of_get_property(dp, "compatible", NULL);
 772                 if (compat && !strcmp(compat, "pci108e,a001"))
 773                         hummingbird_p = 1;
 774                 if (!hummingbird_p) {
 775                         struct device_node *dp;
 776
 777                         /* Of course, Sun has to encode things a thousand
 778                          * different ways, inconsistently.
 779                          */
 780                         for_each_node_by_type(dp, "cpu") {
 781                                 if (!strcmp(dp->name, "SUNW,UltraSPARC-IIe"))
 782                                         hummingbird_p = 1;
 783                         }
 784                 }
 785         }
 786
 787         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 788         if (!p)
 789                 goto fatal_memory_error;
 790
 791         iommu = kzalloc(sizeof(*iommu), GFP_ATOMIC);
 792         if (!iommu)
 793                 goto fatal_memory_error;
 794         pbm = &p->pbm_A;
 795         pbm->iommu = iommu;
 796
 797         upa_portid = of_getintprop_default(dp, "upa-portid", 0xff);
 798
 799         pbm->next = pci_pbm_root;
 800         pci_pbm_root = pbm;
 801
 802         pbm->portid = upa_portid;
 803
 804         /*
 805          * Map in SABRE register set and report the presence of this SABRE.
 806          */
 807
 808         pr_regs = of_get_property(dp, "reg", NULL);
 809
 810         /*
 811          * First REG in property is base of entire SABRE register space.
 812          */
 813         pbm->controller_regs = pr_regs[0].phys_addr;
 814
 815         /* Clear interrupts */
 816
 817         /* PCI first */
 818         for (clear_irq = SABRE_ICLR_A_SLOT0; clear_irq < SABRE_ICLR_B_SLOT0 + 0x80; clear_irq += 8)
 819                 sabre_write(pbm->controller_regs + clear_irq, 0x0UL);
 820
 821         /* Then OBIO */
 822         for (clear_irq = SABRE_ICLR_SCSI; clear_irq < SABRE_ICLR_SCSI + 0x80; clear_irq += 8)
 823                 sabre_write(pbm->controller_regs + clear_irq, 0x0UL);
 824
 825         /* Error interrupts are enabled later after the bus scan. */
 826         sabre_write(pbm->controller_regs + SABRE_PCICTRL,
 827                     (SABRE_PCICTRL_MRLEN   | SABRE_PCICTRL_SERR |
 828                      SABRE_PCICTRL_ARBPARK | SABRE_PCICTRL_AEN));
 829
 830         /* Now map in PCI config space for entire SABRE. */
 831         pbm->config_space =
 832                 (pbm->controller_regs + SABRE_CONFIGSPACE);
 833
 834         vdma = of_get_property(dp, "virtual-dma", NULL);
 835
 836         dma_mask = vdma[0];
 837         switch(vdma[1]) {
 838                 case 0x20000000:
 839                         dma_mask |= 0x1fffffff;
 840                         tsbsize = 64;
 841                         break;
 842                 case 0x40000000:
 843                         dma_mask |= 0x3fffffff;
 844                         tsbsize = 128;
 845                         break;
 846
 847                 case 0x80000000:
 848                         dma_mask |= 0x7fffffff;
 849                         tsbsize = 128;
 850                         break;
 851                 default:
 852                         prom_printf("SABRE: strange virtual-dma size.\n");
 853                         prom_halt();
 854         }
 855
 856         if (sabre_iommu_init(pbm, tsbsize, vdma[0], dma_mask))
 857                 goto fatal_memory_error;
 858
 859         /*
 860          * Look for APB underneath.
 861          */
 862         sabre_pbm_init(p, pbm, dp);
 863         return;
 864
 865 fatal_memory_error:
 866         prom_printf("SABRE: Fatal memory allocation error.\n");
 867         prom_halt();
 868 }