arch/powerpc/platforms/cell/celleb_scc_epci.c

   1 /*
   2  * Support for SCC external PCI
   3  *
   4  * (C) Copyright 2004-2007 TOSHIBA CORPORATION
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #undef DEBUG
  22
  23 #include <linux/kernel.h>
  24 #include <linux/threads.h>
  25 #include <linux/pci.h>
  26 #include <linux/init.h>
  27 #include <linux/pci_regs.h>
  28 #include <linux/bootmem.h>
  29
  30 #include <asm/io.h>
  31 #include <asm/irq.h>
  32 #include <asm/prom.h>
  33 #include <asm/pci-bridge.h>
  34 #include <asm/ppc-pci.h>
  35
  36 #include "celleb_scc.h"
  37 #include "celleb_pci.h"
  38
  39 #define MAX_PCI_DEVICES   32
  40 #define MAX_PCI_FUNCTIONS  8
  41
  42 #define iob()  __asm__ __volatile__("eieio; sync":::"memory")
  43
  44 static inline PCI_IO_ADDR celleb_epci_get_epci_base(
  45                                         struct pci_controller *hose)
  46 {
  47         /*
  48          * Note:
  49          * Celleb epci uses cfg_addr as a base address for
  50          * epci control registers.
  51          */
  52
  53         return hose->cfg_addr;
  54 }
  55
  56 static inline PCI_IO_ADDR celleb_epci_get_epci_cfg(
  57                                         struct pci_controller *hose)
  58 {
  59         /*
  60          * Note:
  61          * Celleb epci uses cfg_data as a base address for
  62          * configuration area for epci devices.
  63          */
  64
  65         return hose->cfg_data;
  66 }
  67
  68 static inline void clear_and_disable_master_abort_interrupt(
  69                                         struct pci_controller *hose)
  70 {
  71         PCI_IO_ADDR epci_base;
  72         PCI_IO_ADDR reg;
  73         epci_base = celleb_epci_get_epci_base(hose);
  74         reg = epci_base + PCI_COMMAND;
  75         out_be32(reg, in_be32(reg) | (PCI_STATUS_REC_MASTER_ABORT << 16));
  76 }
  77
  78 static int celleb_epci_check_abort(struct pci_controller *hose,
  79                                    PCI_IO_ADDR addr)
  80 {
  81         PCI_IO_ADDR reg;
  82         PCI_IO_ADDR epci_base;
  83         u32 val;
  84
  85         iob();
  86         epci_base = celleb_epci_get_epci_base(hose);
  87
  88         reg = epci_base + PCI_COMMAND;
  89         val = in_be32(reg);
  90
  91         if (val & (PCI_STATUS_REC_MASTER_ABORT << 16)) {
  92                 out_be32(reg,
  93                          (val & 0xffff) | (PCI_STATUS_REC_MASTER_ABORT << 16));
  94
  95                 /* clear PCI Controller error, FRE, PMFE */
  96                 reg = epci_base + SCC_EPCI_STATUS;
  97                 out_be32(reg, SCC_EPCI_INT_PAI);
  98
  99                 reg = epci_base + SCC_EPCI_VCSR;
 100                 val = in_be32(reg) & 0xffff;
 101                 val |= SCC_EPCI_VCSR_FRE;
 102                 out_be32(reg, val);
 103
 104                 reg = epci_base + SCC_EPCI_VISTAT;
 105                 out_be32(reg, SCC_EPCI_VISTAT_PMFE);
 106                 return PCIBIOS_DEVICE_NOT_FOUND;
 107         }
 108
 109         return PCIBIOS_SUCCESSFUL;
 110 }
 111
 112 static PCI_IO_ADDR celleb_epci_make_config_addr(struct pci_bus *bus,
 113                 struct pci_controller *hose, unsigned int devfn, int where)
 114 {
 115         PCI_IO_ADDR addr;
 116
 117         if (bus != hose->bus)
 118                 addr = celleb_epci_get_epci_cfg(hose) +
 119                        (((bus->number & 0xff) << 16)
 120                         | ((devfn & 0xff) << 8)
 121                         | (where & 0xff)
 122                         | 0x01000000);
 123         else
 124                 addr = celleb_epci_get_epci_cfg(hose) +
 125                        (((devfn & 0xff) << 8) | (where & 0xff));
 126
 127         pr_debug("EPCI: config_addr = 0x%p\n", addr);
 128
 129         return addr;
 130 }
 131
 132 static int celleb_epci_read_config(struct pci_bus *bus,
 133                         unsigned int devfn, int where, int size, u32 *val)
 134 {
 135         PCI_IO_ADDR epci_base;
 136         PCI_IO_ADDR addr;
 137         struct pci_controller *hose = pci_bus_to_host(bus);
 138
 139         /* allignment check */
 140         BUG_ON(where % size);
 141
 142         if (!celleb_epci_get_epci_cfg(hose))
 143                 return PCIBIOS_DEVICE_NOT_FOUND;
 144
 145         if (bus->number == hose->first_busno && devfn == 0) {
 146                 /* EPCI controller self */
 147
 148                 epci_base = celleb_epci_get_epci_base(hose);
 149                 addr = epci_base + where;
 150
 151                 switch (size) {
 152                 case 1:
 153                         *val = in_8(addr);
 154                         break;
 155                 case 2:
 156                         *val = in_be16(addr);
 157                         break;
 158                 case 4:
 159                         *val = in_be32(addr);
 160                         break;
 161                 default:
 162                         return PCIBIOS_DEVICE_NOT_FOUND;
 163                 }
 164
 165         } else {
 166
 167                 clear_and_disable_master_abort_interrupt(hose);
 168                 addr = celleb_epci_make_config_addr(bus, hose, devfn, where);
 169
 170                 switch (size) {
 171                 case 1:
 172                         *val = in_8(addr);
 173                         break;
 174                 case 2:
 175                         *val = in_le16(addr);
 176                         break;
 177                 case 4:
 178                         *val = in_le32(addr);
 179                         break;
 180                 default:
 181                         return PCIBIOS_DEVICE_NOT_FOUND;
 182                 }
 183         }
 184
 185         pr_debug("EPCI: "
 186                  "addr=0x%p, devfn=0x%x, where=0x%x, size=0x%x, val=0x%x\n",
 187                  addr, devfn, where, size, *val);
 188
 189         return celleb_epci_check_abort(hose, NULL);
 190 }
 191
 192 static int celleb_epci_write_config(struct pci_bus *bus,
 193                         unsigned int devfn, int where, int size, u32 val)
 194 {
 195         PCI_IO_ADDR epci_base;
 196         PCI_IO_ADDR addr;
 197         struct pci_controller *hose = pci_bus_to_host(bus);
 198
 199         /* allignment check */
 200         BUG_ON(where % size);
 201
 202         if (!celleb_epci_get_epci_cfg(hose))
 203                 return PCIBIOS_DEVICE_NOT_FOUND;
 204
 205         if (bus->number == hose->first_busno && devfn == 0) {
 206                 /* EPCI controller self */
 207
 208                 epci_base = celleb_epci_get_epci_base(hose);
 209                 addr = epci_base + where;
 210
 211                 switch (size) {
 212                 case 1:
 213                         out_8(addr, val);
 214                         break;
 215                 case 2:
 216                         out_be16(addr, val);
 217                         break;
 218                 case 4:
 219                         out_be32(addr, val);
 220                         break;
 221                 default:
 222                         return PCIBIOS_DEVICE_NOT_FOUND;
 223                 }
 224
 225         } else {
 226
 227                 clear_and_disable_master_abort_interrupt(hose);
 228                 addr = celleb_epci_make_config_addr(bus, hose, devfn, where);
 229
 230                 switch (size) {
 231                 case 1:
 232                         out_8(addr, val);
 233                         break;
 234                 case 2:
 235                         out_le16(addr, val);
 236                         break;
 237                 case 4:
 238                         out_le32(addr, val);
 239                         break;
 240                 default:
 241                         return PCIBIOS_DEVICE_NOT_FOUND;
 242                 }
 243         }
 244
 245         return celleb_epci_check_abort(hose, addr);
 246 }
 247
 248 struct pci_ops celleb_epci_ops = {
 249         .read = celleb_epci_read_config,
 250         .write = celleb_epci_write_config,
 251 };
 252
 253 /* to be moved in FW */
 254 static int __init celleb_epci_init(struct pci_controller *hose)
 255 {
 256         u32 val;
 257         PCI_IO_ADDR reg;
 258         PCI_IO_ADDR epci_base;
 259         int hwres = 0;
 260
 261         epci_base = celleb_epci_get_epci_base(hose);
 262
 263         /* PCI core reset(Internal bus and PCI clock) */
 264         reg = epci_base + SCC_EPCI_CKCTRL;
 265         val = in_be32(reg);
 266         if (val == 0x00030101)
 267                 hwres = 1;
 268         else {
 269                 val &= ~(SCC_EPCI_CKCTRL_CRST0 | SCC_EPCI_CKCTRL_CRST1);
 270                 out_be32(reg, val);
 271
 272                 /* set PCI core clock */
 273                 val = in_be32(reg);
 274                 val |= (SCC_EPCI_CKCTRL_OCLKEN | SCC_EPCI_CKCTRL_LCLKEN);
 275                 out_be32(reg, val);
 276
 277                 /* release PCI core reset (internal bus) */
 278                 val = in_be32(reg);
 279                 val |= SCC_EPCI_CKCTRL_CRST0;
 280                 out_be32(reg, val);
 281
 282                 /* set PCI clock select */
 283                 reg = epci_base + SCC_EPCI_CLKRST;
 284                 val = in_be32(reg);
 285                 val &= ~SCC_EPCI_CLKRST_CKS_MASK;
 286                 val |= SCC_EPCI_CLKRST_CKS_2;
 287                 out_be32(reg, val);
 288
 289                 /* set arbiter */
 290                 reg = epci_base + SCC_EPCI_ABTSET;
 291                 out_be32(reg, 0x0f1f001f);      /* temporary value */
 292
 293                 /* buffer on */
 294                 reg = epci_base + SCC_EPCI_CLKRST;
 295                 val = in_be32(reg);
 296                 val |= SCC_EPCI_CLKRST_BC;
 297                 out_be32(reg, val);
 298
 299                 /* PCI clock enable */
 300                 val = in_be32(reg);
 301                 val |= SCC_EPCI_CLKRST_PCKEN;
 302                 out_be32(reg, val);
 303
 304                 /* release PCI core reset (all) */
 305                 reg = epci_base + SCC_EPCI_CKCTRL;
 306                 val = in_be32(reg);
 307                 val |= (SCC_EPCI_CKCTRL_CRST0 | SCC_EPCI_CKCTRL_CRST1);
 308                 out_be32(reg, val);
 309
 310                 /* set base translation registers. (already set by Beat) */
 311
 312                 /* set base address masks. (already set by Beat) */
 313         }
 314
 315         /* release interrupt masks and clear all interrupts */
 316         reg = epci_base + SCC_EPCI_INTSET;
 317         out_be32(reg, 0x013f011f);      /* all interrupts enable */
 318         reg = epci_base + SCC_EPCI_VIENAB;
 319         val = SCC_EPCI_VIENAB_PMPEE | SCC_EPCI_VIENAB_PMFEE;
 320         out_be32(reg, val);
 321         reg = epci_base + SCC_EPCI_STATUS;
 322         out_be32(reg, 0xffffffff);
 323         reg = epci_base + SCC_EPCI_VISTAT;
 324         out_be32(reg, 0xffffffff);
 325
 326         /* disable PCI->IB address translation */
 327         reg = epci_base + SCC_EPCI_VCSR;
 328         val = in_be32(reg);
 329         val &= ~(SCC_EPCI_VCSR_DR | SCC_EPCI_VCSR_AT);
 330         out_be32(reg, val);
 331
 332         /* set base addresses. (no need to set?) */
 333
 334         /* memory space, bus master enable */
 335         reg = epci_base + PCI_COMMAND;
 336         val = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
 337         out_be32(reg, val);
 338
 339         /* endian mode setup */
 340         reg = epci_base + SCC_EPCI_ECMODE;
 341         val = 0x00550155;
 342         out_be32(reg, val);
 343
 344         /* set control option */
 345         reg = epci_base + SCC_EPCI_CNTOPT;
 346         val = in_be32(reg);
 347         val |= SCC_EPCI_CNTOPT_O2PMB;
 348         out_be32(reg, val);
 349
 350         /* XXX: temporay: set registers for address conversion setup */
 351         reg = epci_base + SCC_EPCI_CNF10_REG;
 352         out_be32(reg, 0x80000008);
 353         reg = epci_base + SCC_EPCI_CNF14_REG;
 354         out_be32(reg, 0x40000008);
 355
 356         reg = epci_base + SCC_EPCI_BAM0;
 357         out_be32(reg, 0x80000000);
 358         reg = epci_base + SCC_EPCI_BAM1;
 359         out_be32(reg, 0xe0000000);
 360
 361         reg = epci_base + SCC_EPCI_PVBAT;
 362         out_be32(reg, 0x80000000);
 363
 364         if (!hwres) {
 365                 /* release external PCI reset */
 366                 reg = epci_base + SCC_EPCI_CLKRST;
 367                 val = in_be32(reg);
 368                 val |= SCC_EPCI_CLKRST_PCIRST;
 369                 out_be32(reg, val);
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int __init celleb_setup_epci(struct device_node *node,
 376                                     struct pci_controller *hose)
 377 {
 378         struct resource r;
 379
 380         pr_debug("PCI: celleb_setup_epci()\n");
 381
 382         /*
 383          * Note:
 384          * Celleb epci uses cfg_addr and cfg_data member of
 385          * pci_controller structure in irregular way.
 386          *
 387          * cfg_addr is used to map for control registers of
 388          * celleb epci.
 389          *
 390          * cfg_data is used for configuration area of devices
 391          * on Celleb epci buses.
 392          */
 393
 394         if (of_address_to_resource(node, 0, &r))
 395                 goto error;
 396         hose->cfg_addr = ioremap(r.start, (r.end - r.start + 1));
 397         if (!hose->cfg_addr)
 398                 goto error;
 399         pr_debug("EPCI: cfg_addr map 0x%016llx->0x%016lx + 0x%016llx\n",
 400                  r.start, (unsigned long)hose->cfg_addr, (r.end - r.start + 1));
 401
 402         if (of_address_to_resource(node, 2, &r))
 403                 goto error;
 404         hose->cfg_data = ioremap(r.start, (r.end - r.start + 1));
 405         if (!hose->cfg_data)
 406                 goto error;
 407         pr_debug("EPCI: cfg_data map 0x%016llx->0x%016lx + 0x%016llx\n",
 408                  r.start, (unsigned long)hose->cfg_data, (r.end - r.start + 1));
 409
 410         hose->ops = &celleb_epci_ops;
 411         celleb_epci_init(hose);
 412
 413         return 0;
 414
 415 error:
 416         if (hose->cfg_addr)
 417                 iounmap(hose->cfg_addr);
 418
 419         if (hose->cfg_data)
 420                 iounmap(hose->cfg_data);
 421         return 1;
 422 }
 423
 424 struct celleb_phb_spec celleb_epci_spec __initdata = {
 425         .setup = celleb_setup_epci,
 426         .ops = &spiderpci_ops,
 427         .iowa_init = &spiderpci_iowa_init,
 428         .iowa_data = (void *)0,
 429 };