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 <linux/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 /* Structures mapping & Defines for PCI Unit                                */
  24 /* ======================================================================== */
  25
  26 #define MPC52xx_PCI_GSCR_BM             0x40000000
  27 #define MPC52xx_PCI_GSCR_PE             0x20000000
  28 #define MPC52xx_PCI_GSCR_SE             0x10000000
  29 #define MPC52xx_PCI_GSCR_XLB2PCI_MASK   0x07000000
  30 #define MPC52xx_PCI_GSCR_XLB2PCI_SHIFT  24
  31 #define MPC52xx_PCI_GSCR_IPG2PCI_MASK   0x00070000
  32 #define MPC52xx_PCI_GSCR_IPG2PCI_SHIFT  16
  33 #define MPC52xx_PCI_GSCR_BME            0x00004000
  34 #define MPC52xx_PCI_GSCR_PEE            0x00002000
  35 #define MPC52xx_PCI_GSCR_SEE            0x00001000
  36 #define MPC52xx_PCI_GSCR_PR             0x00000001
  37
  38
  39 #define MPC52xx_PCI_IWBTAR_TRANSLATION(proc_ad,pci_ad,size)       \
  40                 ( ( (proc_ad) & 0xff000000 )                    | \
  41                   ( (((size) - 1) >> 8) & 0x00ff0000 )          | \
  42                   ( ((pci_ad) >> 16) & 0x0000ff00 ) )
  43
  44 #define MPC52xx_PCI_IWCR_PACK(win0,win1,win2)   (((win0) << 24) | \
  45                                                  ((win1) << 16) | \
  46                                                  ((win2) <<  8))
  47
  48 #define MPC52xx_PCI_IWCR_DISABLE        0x0
  49 #define MPC52xx_PCI_IWCR_ENABLE         0x1
  50 #define MPC52xx_PCI_IWCR_READ           0x0
  51 #define MPC52xx_PCI_IWCR_READ_LINE      0x2
  52 #define MPC52xx_PCI_IWCR_READ_MULTI     0x4
  53 #define MPC52xx_PCI_IWCR_MEM            0x0
  54 #define MPC52xx_PCI_IWCR_IO             0x8
  55
  56 #define MPC52xx_PCI_TCR_P               0x01000000
  57 #define MPC52xx_PCI_TCR_LD              0x00010000
  58 #define MPC52xx_PCI_TCR_WCT8            0x00000008
  59
  60 #define MPC52xx_PCI_TBATR_DISABLE       0x0
  61 #define MPC52xx_PCI_TBATR_ENABLE        0x1
  62
  63 struct mpc52xx_pci {
  64         u32     idr;            /* PCI + 0x00 */
  65         u32     scr;            /* PCI + 0x04 */
  66         u32     ccrir;          /* PCI + 0x08 */
  67         u32     cr1;            /* PCI + 0x0C */
  68         u32     bar0;           /* PCI + 0x10 */
  69         u32     bar1;           /* PCI + 0x14 */
  70         u8      reserved1[16];  /* PCI + 0x18 */
  71         u32     ccpr;           /* PCI + 0x28 */
  72         u32     sid;            /* PCI + 0x2C */
  73         u32     erbar;          /* PCI + 0x30 */
  74         u32     cpr;            /* PCI + 0x34 */
  75         u8      reserved2[4];   /* PCI + 0x38 */
  76         u32     cr2;            /* PCI + 0x3C */
  77         u8      reserved3[32];  /* PCI + 0x40 */
  78         u32     gscr;           /* PCI + 0x60 */
  79         u32     tbatr0;         /* PCI + 0x64 */
  80         u32     tbatr1;         /* PCI + 0x68 */
  81         u32     tcr;            /* PCI + 0x6C */
  82         u32     iw0btar;        /* PCI + 0x70 */
  83         u32     iw1btar;        /* PCI + 0x74 */
  84         u32     iw2btar;        /* PCI + 0x78 */
  85         u8      reserved4[4];   /* PCI + 0x7C */
  86         u32     iwcr;           /* PCI + 0x80 */
  87         u32     icr;            /* PCI + 0x84 */
  88         u32     isr;            /* PCI + 0x88 */
  89         u32     arb;            /* PCI + 0x8C */
  90         u8      reserved5[104]; /* PCI + 0x90 */
  91         u32     car;            /* PCI + 0xF8 */
  92         u8      reserved6[4];   /* PCI + 0xFC */
  93 };
  94
  95 /* MPC5200 device tree match tables */
  96 const struct of_device_id mpc52xx_pci_ids[] __initconst = {
  97         { .type = "pci", .compatible = "fsl,mpc5200-pci", },
  98         { .type = "pci", .compatible = "mpc5200-pci", },
  99         {}
 100 };
 101
 102 /* ======================================================================== */
 103 /* PCI configuration access                                                 */
 104 /* ======================================================================== */
 105
 106 static int
 107 mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
 108                                 int offset, int len, u32 *val)
 109 {
 110         struct pci_controller *hose = pci_bus_to_host(bus);
 111         u32 value;
 112
 113         if (ppc_md.pci_exclude_device)
 114                 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
 115                         return PCIBIOS_DEVICE_NOT_FOUND;
 116
 117         out_be32(hose->cfg_addr,
 118                 (1 << 31) |
 119                 (bus->number << 16) |
 120                 (devfn << 8) |
 121                 (offset & 0xfc));
 122         mb();
 123
 124 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
 125         if (bus->number) {
 126                 /* workaround for the bug 435 of the MPC5200 (L25R);
 127                  * Don't do 32 bits config access during type-1 cycles */
 128                 switch (len) {
 129                       case 1:
 130                         value = in_8(((u8 __iomem *)hose->cfg_data) +
 131                                      (offset & 3));
 132                         break;
 133                       case 2:
 134                         value = in_le16(((u16 __iomem *)hose->cfg_data) +
 135                                         ((offset>>1) & 1));
 136                         break;
 137
 138                       default:
 139                         value = in_le16((u16 __iomem *)hose->cfg_data) |
 140                                 (in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16);
 141                         break;
 142                 }
 143         }
 144         else
 145 #endif
 146         {
 147                 value = in_le32(hose->cfg_data);
 148
 149                 if (len != 4) {
 150                         value >>= ((offset & 0x3) << 3);
 151                         value &= 0xffffffff >> (32 - (len << 3));
 152                 }
 153         }
 154
 155         *val = value;
 156
 157         out_be32(hose->cfg_addr, 0);
 158         mb();
 159
 160         return PCIBIOS_SUCCESSFUL;
 161 }
 162
 163 static int
 164 mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
 165                                 int offset, int len, u32 val)
 166 {
 167         struct pci_controller *hose = pci_bus_to_host(bus);
 168         u32 value, mask;
 169
 170         if (ppc_md.pci_exclude_device)
 171                 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
 172                         return PCIBIOS_DEVICE_NOT_FOUND;
 173
 174         out_be32(hose->cfg_addr,
 175                 (1 << 31) |
 176                 (bus->number << 16) |
 177                 (devfn << 8) |
 178                 (offset & 0xfc));
 179         mb();
 180
 181 #if defined(CONFIG_PPC_MPC5200_BUGFIX)
 182         if (bus->number) {
 183                 /* workaround for the bug 435 of the MPC5200 (L25R);
 184                  * Don't do 32 bits config access during type-1 cycles */
 185                 switch (len) {
 186                       case 1:
 187                         out_8(((u8 __iomem *)hose->cfg_data) +
 188                                 (offset & 3), val);
 189                         break;
 190                       case 2:
 191                         out_le16(((u16 __iomem *)hose->cfg_data) +
 192                                 ((offset>>1) & 1), val);
 193                         break;
 194
 195                       default:
 196                         out_le16((u16 __iomem *)hose->cfg_data,
 197                                 (u16)val);
 198                         out_le16(((u16 __iomem *)hose->cfg_data) + 1,
 199                                 (u16)(val>>16));
 200                         break;
 201                 }
 202         }
 203         else
 204 #endif
 205         {
 206                 if (len != 4) {
 207                         value = in_le32(hose->cfg_data);
 208
 209                         offset = (offset & 0x3) << 3;
 210                         mask = (0xffffffff >> (32 - (len << 3)));
 211                         mask <<= offset;
 212
 213                         value &= ~mask;
 214                         val = value | ((val << offset) & mask);
 215                 }
 216
 217                 out_le32(hose->cfg_data, val);
 218         }
 219         mb();
 220
 221         out_be32(hose->cfg_addr, 0);
 222         mb();
 223
 224         return PCIBIOS_SUCCESSFUL;
 225 }
 226
 227 static struct pci_ops mpc52xx_pci_ops = {
 228         .read  = mpc52xx_pci_read_config,
 229         .write = mpc52xx_pci_write_config
 230 };
 231
 232
 233 /* ======================================================================== */
 234 /* PCI setup                                                                */
 235 /* ======================================================================== */
 236
 237 static void __init
 238 mpc52xx_pci_setup(struct pci_controller *hose,
 239                   struct mpc52xx_pci __iomem *pci_regs, phys_addr_t pci_phys)
 240 {
 241         struct resource *res;
 242         u32 tmp;
 243         int iwcr0 = 0, iwcr1 = 0, iwcr2 = 0;
 244
 245         pr_debug("mpc52xx_pci_setup(hose=%p, pci_regs=%p)\n", hose, pci_regs);
 246
 247         /* pci_process_bridge_OF_ranges() found all our addresses for us;
 248          * now store them in the right places */
 249         hose->cfg_addr = &pci_regs->car;
 250         hose->cfg_data = hose->io_base_virt;
 251
 252         /* Control regs */
 253         tmp = in_be32(&pci_regs->scr);
 254         tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
 255         out_be32(&pci_regs->scr, tmp);
 256
 257         /* Memory windows */
 258         res = &hose->mem_resources[0];
 259         if (res->flags) {
 260                 pr_debug("mem_resource[0] = "
 261                          "{.start=%llx, .end=%llx, .flags=%llx}\n",
 262                          (unsigned long long)res->start,
 263                          (unsigned long long)res->end,
 264                          (unsigned long long)res->flags);
 265                 out_be32(&pci_regs->iw0btar,
 266                          MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
 267                                                         resource_size(res)));
 268                 iwcr0 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
 269                 if (res->flags & IORESOURCE_PREFETCH)
 270                         iwcr0 |= MPC52xx_PCI_IWCR_READ_MULTI;
 271                 else
 272                         iwcr0 |= MPC52xx_PCI_IWCR_READ;
 273         }
 274
 275         res = &hose->mem_resources[1];
 276         if (res->flags) {
 277                 pr_debug("mem_resource[1] = {.start=%x, .end=%x, .flags=%lx}\n",
 278                          res->start, res->end, res->flags);
 279                 out_be32(&pci_regs->iw1btar,
 280                          MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start,
 281                                                         resource_size(res)));
 282                 iwcr1 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM;
 283                 if (res->flags & IORESOURCE_PREFETCH)
 284                         iwcr1 |= MPC52xx_PCI_IWCR_READ_MULTI;
 285                 else
 286                         iwcr1 |= MPC52xx_PCI_IWCR_READ;
 287         }
 288
 289         /* IO resources */
 290         res = &hose->io_resource;
 291         if (!res) {
 292                 printk(KERN_ERR "%s: Didn't find IO resources\n", __FILE__);
 293                 return;
 294         }
 295         pr_debug(".io_resource={.start=%llx,.end=%llx,.flags=%llx} "
 296                  ".io_base_phys=0x%p\n",
 297                  (unsigned long long)res->start,
 298                  (unsigned long long)res->end,
 299                  (unsigned long long)res->flags, (void*)hose->io_base_phys);
 300         out_be32(&pci_regs->iw2btar,
 301                  MPC52xx_PCI_IWBTAR_TRANSLATION(hose->io_base_phys,
 302                                                 res->start,
 303                                                 resource_size(res)));
 304         iwcr2 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_IO;
 305
 306         /* Set all the IWCR fields at once; they're in the same reg */
 307         out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2));
 308
 309         /* Map IMMR onto PCI bus */
 310         pci_phys &= 0xfffc0000; /* bar0 has only 14 significant bits */
 311         out_be32(&pci_regs->tbatr0, MPC52xx_PCI_TBATR_ENABLE | pci_phys);
 312         out_be32(&pci_regs->bar0, PCI_BASE_ADDRESS_MEM_PREFETCH | pci_phys);
 313
 314         /* Map memory onto PCI bus */
 315         out_be32(&pci_regs->tbatr1, MPC52xx_PCI_TBATR_ENABLE);
 316         out_be32(&pci_regs->bar1, PCI_BASE_ADDRESS_MEM_PREFETCH);
 317
 318         out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD | MPC52xx_PCI_TCR_WCT8);
 319
 320         tmp = in_be32(&pci_regs->gscr);
 321 #if 0
 322         /* Reset the exteral bus ( internal PCI controller is NOT reset ) */
 323         /* Not necessary and can be a bad thing if for example the bootloader
 324            is displaying a splash screen or ... Just left here for
 325            documentation purpose if anyone need it */
 326         out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR);
 327         udelay(50);
 328 #endif
 329
 330         /* Make sure the PCI bridge is out of reset */
 331         out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR);
 332 }
 333
 334 static void
 335 mpc52xx_pci_fixup_resources(struct pci_dev *dev)
 336 {
 337         int i;
 338
 339         pr_debug("mpc52xx_pci_fixup_resources() %.4x:%.4x\n",
 340                  dev->vendor, dev->device);
 341
 342         /* We don't rely on boot loader for PCI and resets all
 343            devices */
 344         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 345                 struct resource *res = &dev->resource[i];
 346                 if (res->end > res->start) {    /* Only valid resources */
 347                         res->end -= res->start;
 348                         res->start = 0;
 349                         res->flags |= IORESOURCE_UNSET;
 350                 }
 351         }
 352
 353         /* The PCI Host bridge of MPC52xx has a prefetch memory resource
 354            fixed to 1Gb. Doesn't fit in the resource system so we remove it */
 355         if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) &&
 356              (   dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200
 357               || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) {
 358                 struct resource *res = &dev->resource[1];
 359                 res->start = res->end = res->flags = 0;
 360         }
 361 }
 362
 363 int __init
 364 mpc52xx_add_bridge(struct device_node *node)
 365 {
 366         int len;
 367         struct mpc52xx_pci __iomem *pci_regs;
 368         struct pci_controller *hose;
 369         const int *bus_range;
 370         struct resource rsrc;
 371
 372         pr_debug("Adding MPC52xx PCI host bridge %s\n", node->full_name);
 373
 374         pci_add_flags(PCI_REASSIGN_ALL_BUS);
 375
 376         if (of_address_to_resource(node, 0, &rsrc) != 0) {
 377                 printk(KERN_ERR "Can't get %s resources\n", node->full_name);
 378                 return -EINVAL;
 379         }
 380
 381         bus_range = of_get_property(node, "bus-range", &len);
 382         if (bus_range == NULL || len < 2 * sizeof(int)) {
 383                 printk(KERN_WARNING "Can't get %s bus-range, assume bus 0\n",
 384                        node->full_name);
 385                 bus_range = NULL;
 386         }
 387
 388         /* There are some PCI quirks on the 52xx, register the hook to
 389          * fix them. */
 390         ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources;
 391
 392         /* Alloc and initialize the pci controller.  Values in the device
 393          * tree are needed to configure the 52xx PCI controller.  Rather
 394          * than parse the tree here, let pci_process_bridge_OF_ranges()
 395          * do it for us and extract the values after the fact */
 396         hose = pcibios_alloc_controller(node);
 397         if (!hose)
 398                 return -ENOMEM;
 399
 400         hose->first_busno = bus_range ? bus_range[0] : 0;
 401         hose->last_busno = bus_range ? bus_range[1] : 0xff;
 402
 403         hose->ops = &mpc52xx_pci_ops;
 404
 405         pci_regs = ioremap(rsrc.start, resource_size(&rsrc));
 406         if (!pci_regs)
 407                 return -ENOMEM;
 408
 409         pci_process_bridge_OF_ranges(hose, node, 1);
 410
 411         /* Finish setting up PCI using values obtained by
 412          * pci_proces_bridge_OF_ranges */
 413         mpc52xx_pci_setup(hose, pci_regs, rsrc.start);
 414
 415         return 0;
 416 }
 417
 418 void __init mpc52xx_setup_pci(void)
 419 {
 420         struct device_node *pci;
 421
 422         pci = of_find_matching_node(NULL, mpc52xx_pci_ids);
 423         if (!pci)
 424                 return;
 425
 426         mpc52xx_add_bridge(pci);
 427         of_node_put(pci);
 428 }