LXR linux/arch/powerpc/platforms/52xx/mpc52xx

   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
  63struct 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 */
  96const 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
 106static int
 107mpc52xx_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
 163static int
 164mpc52xx_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
 227static 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
 237static void __init
 238mpc52xx_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
 334static void
 335mpc52xx_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
 363int __init
 364mpc52xx_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
 418void __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}
 429