arch/powerpc/platforms/52xx/mpc52xx_pci.c

   1 /*
   2  * PCI code for the Freescale MPC52xx embedded CPU.
   3  *
   4  * Copyright (C) 2006 Secret Lab Technologies Ltd.
   5  *                        Grant Likely <grant.likely@secretlab.ca>
   6  * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
   7  *
   8  * This file is licensed under the terms of the GNU General Public License
   9  * version 2. This program is licensed "as is" without any warranty of any
  10  * kind, whether express or implied.
  11  */
  12
  13 #undef DEBUG
  14
  15 #include <asm/pci.h>
  16 #include <asm/mpc52xx.h>
  17 #include <asm/delay.h>
  18 #include <asm/machdep.h>
  19 #include <linux/kernel.h>
  20
  21
  22 /* ======================================================================== */
  23 /* PCI windows config                                                       */
  24 /* ======================================================================== */
  25
  26 #define MPC52xx_PCI_TARGET_IO   0xf0000000
  27 #define MPC52xx_PCI_TARGET_MEM  0x00000000
  28
  29
  30 /* ======================================================================== */
  31 /* Structures mapping & Defines for PCI Unit                                */
  32 /* ======================================================================== */
  33
  34 #define MPC52xx_PCI_GSCR_BM             0x40000000
  35 #define MPC52xx_PCI_GSCR_PE             0x20000000
  36 #define MPC52xx_PCI_GSCR_SE             0x10000000
  37 #define MPC52xx_PCI_GSCR_XLB2PCI_MASK   0x07000000
  38 #define MPC52xx_PCI_GSCR_XLB2PCI_SHIFT  24
  39 #define MPC52xx_PCI_GSCR_IPG2PCI_MASK   0x00070000
  40 #define MPC52xx_PCI_GSCR_IPG2PCI_SHIFT  16
  41 #define MPC52xx_PCI_GSCR_BME            0x00004000
  42 #define MPC52xx_PCI_GSCR_PEE            0x00002000
  43 #define MPC52xx_PCI_GSCR_SEE            0x00001000
  44 #define MPC52xx_PCI_GSCR_PR             0x00000001
  45
  46
  47 #define MPC52xx_PCI_IWBTAR_TRANSLATION(proc_ad,pci_ad,size)       \
  48                 ( ( (proc_ad) & 0xff000000 )                    | \
  49                   ( (((size) - 1) >> 8) & 0x00ff0000 )          | \
  50                   ( ((pci_ad) >> 16) & 0x0000ff00 ) )
  51
  52 #define MPC52xx_PCI_IWCR_PACK(win0,win1,win2)   (((win0) << 24) | \
  53                                                  ((win1) << 16) | \
  54                                                  ((win2) <<  8))
  55
  56 #define MPC52xx_PCI_IWCR_DISABLE        0x0
  57 #define MPC52xx_PCI_IWCR_ENABLE         0x1
  58 #define MPC52xx_PCI_IWCR_READ           0x0
  59 #define MPC52xx_PCI_IWCR_READ_LINE      0x2
  60 #define MPC52xx_PCI_IWCR_READ_MULTI     0x4
  61 #define MPC52xx_PCI_IWCR_MEM            0x0
  62 #define MPC52xx_PCI_IWCR_IO             0x8
  63
  64 #define MPC52xx_PCI_TCR_P               0x01000000
  65 #define MPC52xx_PCI_TCR_LD              0x00010000
  66
  67 #define MPC52xx_PCI_TBATR_DISABLE       0x0
  68 #define MPC52xx_PCI_TBATR_ENABLE        0x1
  69
  70 struct mpc52xx_pci {
  71         u32     idr;            /* PCI + 0x00 */
  72         u32     scr;            /* PCI + 0x04 */
  73         u32     ccrir;          /* PCI + 0x08 */
  74         u32     cr1;            /* PCI + 0x0C */
  75         u32     bar0;           /* PCI + 0x10 */
  76         u32     bar1;           /* PCI + 0x14 */
  77         u8      reserved1[16];  /* PCI + 0x18 */
  78         u32     ccpr;           /* PCI + 0x28 */
  79         u32     sid;            /* PCI + 0x2C */
  80         u32     erbar;          /* PCI + 0x30 */
  81         u32     cpr;            /* PCI + 0x34 */
  82         u8      reserved2[4];   /* PCI + 0x38 */
  83         u32     cr2;            /* PCI + 0x3C */
  84         u8      reserved3[32];  /* PCI + 0x40 */
  85         u32     gscr;           /* PCI + 0x60 */
  86         u32     tbatr0;         /* PCI + 0x64 */
  87         u32     tbatr1;         /* PCI + 0x68 */
  88         u32     tcr;            /* PCI + 0x6C */
  89         u32     iw0btar;        /* PCI + 0x70 */
  90         u32     iw1btar;        /* PCI + 0x74 */
  91         u32     iw2btar;        /* PCI + 0x78 */
  92         u8      reserved4[4];   /* PCI + 0x7C */
  93         u32     iwcr;           /* PCI + 0x80 */
  94         u32     icr;            /* PCI + 0x84 */
  95         u32     isr;            /* PCI + 0x88 */
  96         u32     arb;            /* PCI + 0x8C */
  97         u8      reserved5[104]; /* PCI + 0x90 */
  98         u32     car;            /* PCI + 0xF8 */
  99         u8      reserved6[4];   /* PCI + 0xFC */
 100 };
 101
 102
 103 /* ======================================================================== */
 104 /* PCI configuration acess                                                  */
 105 /* ======================================================================== */
 106
 107 static int
 108 mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 109                                 int offset, int len, u32 *val)
 110 {
 111         struct pci_controller *hose = bus->sysdata;
 112         u32 value;
 113
 114         if (ppc_md.pci_exclude_device)
 115                 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
 116                         return PCIBIOS_DEVICE_NOT_FOUND;
 117
 118         out_be32(hose->cfg_addr,
 119                 (1 << 31) |
 120                 (bus->number << 16) |
 121                 (devfn << 8) |
 122                 (offset & 0xfc));
 123         mb();
 124
 125 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
 126         if (bus->number) {
 127                 /* workaround for the bug 435 of the MPC5200 (L25R);
 128                  * Don't do 32 bits config access during type-1 cycles */
 129                 switch (len) {
 130                       case 1:
 131                         value = in_8(((u8 __iomem *)hose->cfg_data) +
 132                                      (offset & 3));
 133                         break;
 134                       case 2:
 135                         value = in_le16(((u16 __iomem *)hose->cfg_data) +
 136                                         ((offset>>1) & 1));
 137                         break;
 138
 139                       default:
 140                         value = in_le16((u16 __iomem *)hose->cfg_data) |
 141                                 (in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16);
 142                         break;
 143                 }
 144         }
 145         else
 146 #endif
 147         {
 148                 value = in_le32(hose->cfg_data);
 149
 150                 if (len != 4) {
 151                         value >>= ((offset & 0x3) << 3);
 152                         value &= 0xffffffff >> (32 - (len << 3));
 153                 }
 154         }
 155
 156         *val = value;
 157
 158         out_be32(hose->cfg_addr, 0);
 159         mb();
 160
 161         return PCIBIOS_SUCCESSFUL;
 162 }
 163
 164 static int
 165 mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 166                                 int offset, int len, u32 val)
 167 {
 168         struct pci_controller *hose = bus->sysdata;
 169         u32 value, mask;
 170
 171         if (ppc_md.pci_exclude_device)
 172                 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
 173                         return PCIBIOS_DEVICE_NOT_FOUND;
 174
 175         out_be32(hose->cfg_addr,
 176                 (1 << 31) |
 177                 (bus->number << 16) |
 178                 (devfn << 8) |
 179                 (offset & 0xfc));
 180         mb();
 181
 182 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
 183         if (bus->number) {
 184                 /* workaround for the bug 435 of the MPC5200 (L25R);
 185                  * Don't do 32 bits config access during type-1 cycles */
 186                 switch (len) {
 187                       case 1:
 188                         out_8(((u8 __iomem *)hose->cfg_data) +
 189                                 (offset & 3), val);
 190                         break;
 191                       case 2:
 192                         out_le16(((u16 __iomem *)hose->cfg_data) +
 193                                 ((offset>>1) & 1), val);
 194                         break;
 195
 196                       default:
 197                         out_le16((u16 __iomem *)hose->cfg_data,
 198                                 (u16)val);
 199                         out_le16(((u16 __iomem *)hose->cfg_data) + 1,
 200                                 (u16)(val>>16));
 201                         break;
 202                 }
 203         }
 204         else
 205 #endif
 206         {
 207                 if (len != 4) {
 208                         value = in_le32(hose->cfg_data);
 209
 210                         offset = (offset & 0x3) << 3;
 211                         mask = (0xffffffff >> (32 - (len << 3)));
 212                         mask <<= offset;
 213
 214                         value &= ~mask;
 215                         val = value | ((val << offset) & mask);
 216                 }
 217
 218                 out_le32(hose->cfg_data, val);
 219         }
 220         mb();
 221
 222         out_be32(hose->cfg_addr, 0);
 223         mb();
 224
 225         return PCIBIOS_SUCCESSFUL;
 226 }
 227
 228 static struct pci_ops mpc52xx_pci_ops = {
 229         .read  = mpc52xx_pci_read_config,
 230         .write = mpc52xx_pci_write_config
 231 };
 232
 233
 234 /* ======================================================================== */
 235 /* PCI setup                                                                */
 236 /* ======================================================================== */
 237
 238 static void __init
 239 mpc52xx_pci_setup(struct pci_controller *hose,
 240                   struct mpc52xx_pci __iomem *pci_regs)
 241 {
 242         struct resource *res;
 243         u32 tmp;
 244         int iwcr0 = 0, iwcr1 = 0, iwcr2 = 0;
 245
 246         pr_debug("mpc52xx_pci_setup(hose=%p, pci_regs=%p)\n", hose, pci_regs);
 247
 248         /* pci_process_bridge_OF_ranges() found all our addresses for us;
 249          * now store them in the right places */
 250         hose->cfg_addr = &pci_regs->car;
 251         hose->cfg_data = hose->io_base_virt;
 252
 253         /* Control regs */
 254         tmp = in_be32(&pci_regs->scr);
 255         tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
 256         out_be32(&pci_regs->scr, tmp);
 257
 258         /* Memory windows */
 259         res = &hose->mem_resources[0];
 260         if (res->flags) {
 261                 pr_debug("mem_resource[0] = {.start=%x, .end=%x, .flags=%lx}\n",
 262                          res->start, res->end, res->flags);
 263                 out_be32(&pci_regs->iw0btar,
 264                          MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
 265                                   res->end - res->start + 1));
 266                 iwcr0 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
 267                 if (res->flags & IORESOURCE_PREFETCH)
 268                         iwcr0 |= MPC52xx_PCI_IWCR_READ_MULTI;
 269                 else
 270                         iwcr0 |= MPC52xx_PCI_IWCR_READ;
 271         }
 272
 273         res = &hose->mem_resources[1];
 274         if (res->flags) {
 275                 pr_debug("mem_resource[1] = {.start=%x, .end=%x, .flags=%lx}\n",
 276                          res->start, res->end, res->flags);
 277                 out_be32(&pci_regs->iw1btar,
 278                          MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
 279                                   res->end - res->start + 1));
 280                 iwcr1 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
 281                 if (res->flags & IORESOURCE_PREFETCH)
 282                         iwcr1 |= MPC52xx_PCI_IWCR_READ_MULTI;
 283                 else
 284                         iwcr1 |= MPC52xx_PCI_IWCR_READ;
 285         }
 286
 287         /* IO resources */
 288         res = &hose->io_resource;
 289         if (!res) {
 290                 printk(KERN_ERR "%s: Didn't find IO resources\n", __FILE__);
 291                 return;
 292         }
 293         pr_debug(".io_resource={.start=%x,.end=%x,.flags=%lx} "
 294                  ".io_base_phys=0x%p\n",
 295                  res->start, res->end, res->flags, (void*)hose->io_base_phys);
 296         out_be32(&pci_regs->iw2btar,
 297                  MPC52xx_PCI_IWBTAR_TRANSLATION(hose->io_base_phys,
 298                                                 res->start,
 299                                                 res->end - res->start + 1));
 300         iwcr2 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_IO;
 301
 302         /* Set all the IWCR fields at once; they're in the same reg */
 303         out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2));
 304
 305         out_be32(&pci_regs->tbatr0,
 306                 MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_IO );
 307         out_be32(&pci_regs->tbatr1,
 308                 MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_MEM );
 309
 310         out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD);
 311
 312         tmp = in_be32(&pci_regs->gscr);
 313 #if 0
 314         /* Reset the exteral bus ( internal PCI controller is NOT resetted ) */
 315         /* Not necessary and can be a bad thing if for example the bootloader
 316            is displaying a splash screen or ... Just left here for
 317            documentation purpose if anyone need it */
 318         out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
 319         udelay(50);
 320 #endif
 321
 322         /* Make sure the PCI bridge is out of reset */
 323         out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR);
 324 }
 325
 326 static void
 327 mpc52xx_pci_fixup_resources(struct pci_dev *dev)
 328 {
 329         int i;
 330
 331         pr_debug("mpc52xx_pci_fixup_resources() %.4x:%.4x\n",
 332                  dev->vendor, dev->device);
 333
 334         /* We don't rely on boot loader for PCI and resets all
 335            devices */
 336         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 337                 struct resource *res = &dev->resource[i];
 338                 if (res->end > res->start) {    /* Only valid resources */
 339                         res->end -= res->start;
 340                         res->start = 0;
 341                         res->flags |= IORESOURCE_UNSET;
 342                 }
 343         }
 344
 345         /* The PCI Host bridge of MPC52xx has a prefetch memory resource
 346            fixed to 1Gb. Doesn't fit in the resource system so we remove it */
 347         if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
 348              (   dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200
 349               || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) {
 350                 struct resource *res = &dev->resource[1];
 351                 res->start = res->end = res->flags = 0;
 352         }
 353 }
 354
 355 int __init
 356 mpc52xx_add_bridge(struct device_node *node)
 357 {
 358         int len;
 359         struct mpc52xx_pci __iomem *pci_regs;
 360         struct pci_controller *hose;
 361         const int *bus_range;
 362         struct resource rsrc;
 363
 364         pr_debug("Adding MPC52xx PCI host bridge %s\n", node->full_name);
 365
 366         pci_assign_all_buses = 1;
 367
 368         if (of_address_to_resource(node, 0, &rsrc) != 0) {
 369                 printk(KERN_ERR "Can't get %s resources\n", node->full_name);
 370                 return -EINVAL;
 371         }
 372
 373         bus_range = of_get_property(node, "bus-range", &len);
 374         if (bus_range == NULL || len < 2 * sizeof(int)) {
 375                 printk(KERN_WARNING "Can't get %s bus-range, assume bus 0\n",
 376                        node->full_name);
 377                 bus_range = NULL;
 378         }
 379
 380         /* There are some PCI quirks on the 52xx, register the hook to
 381          * fix them. */
 382         ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;
 383
 384         /* Alloc and initialize the pci controller.  Values in the device
 385          * tree are needed to configure the 52xx PCI controller.  Rather
 386          * than parse the tree here, let pci_process_bridge_OF_ranges()
 387          * do it for us and extract the values after the fact */
 388         hose = pcibios_alloc_controller(node);
 389         if (!hose)
 390                 return -ENOMEM;
 391
 392         hose->first_busno = bus_range ? bus_range[0] : 0;
 393         hose->last_busno = bus_range ? bus_range[1] : 0xff;
 394
 395         hose->ops = &mpc52xx_pci_ops;
 396
 397         pci_regs = ioremap(rsrc.start, rsrc.end - rsrc.start + 1);
 398         if (!pci_regs)
 399                 return -ENOMEM;
 400
 401         pci_process_bridge_OF_ranges(hose, node, 1);
 402
 403         /* Finish setting up PCI using values obtained by
 404          * pci_proces_bridge_OF_ranges */
 405         mpc52xx_pci_setup(hose, pci_regs);
 406
 407         return 0;
 408 }