arch/arm/mach-orion5x/pci.c

   1 /*
   2  * arch/arm/mach-orion5x/pci.c
   3  *
   4  * PCI and PCIe functions for Marvell Orion System On Chip
   5  *
   6  * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
   7  *
   8  * This file is licensed under the terms of the GNU General Public
   9  * License version 2.  This program is licensed "as is" without any
  10  * warranty of any kind, whether express or implied.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/pci.h>
  15 #include <linux/mbus.h>
  16 #include <asm/mach/pci.h>
  17 #include <plat/pcie.h>
  18 #include "common.h"
  19
  20 /*****************************************************************************
  21  * Orion has one PCIe controller and one PCI controller.
  22  *
  23  * Note1: The local PCIe bus number is '0'. The local PCI bus number
  24  * follows the scanned PCIe bridged busses, if any.
  25  *
  26  * Note2: It is possible for PCI/PCIe agents to access many subsystem's
  27  * space, by configuring BARs and Address Decode Windows, e.g. flashes on
  28  * device bus, Orion registers, etc. However this code only enable the
  29  * access to DDR banks.
  30  ****************************************************************************/
  31
  32
  33 /*****************************************************************************
  34  * PCIe controller
  35  ****************************************************************************/
  36 #define PCIE_BASE       ((void __iomem *)ORION5X_PCIE_VIRT_BASE)
  37
  38 void __init orion5x_pcie_id(u32 *dev, u32 *rev)
  39 {
  40         *dev = orion_pcie_dev_id(PCIE_BASE);
  41         *rev = orion_pcie_rev(PCIE_BASE);
  42 }
  43
  44 static int pcie_valid_config(int bus, int dev)
  45 {
  46         /*
  47          * Don't go out when trying to access --
  48          * 1. nonexisting device on local bus
  49          * 2. where there's no device connected (no link)
  50          */
  51         if (bus == 0 && dev == 0)
  52                 return 1;
  53
  54         if (!orion_pcie_link_up(PCIE_BASE))
  55                 return 0;
  56
  57         if (bus == 0 && dev != 1)
  58                 return 0;
  59
  60         return 1;
  61 }
  62
  63
  64 /*
  65  * PCIe config cycles are done by programming the PCIE_CONF_ADDR register
  66  * and then reading the PCIE_CONF_DATA register. Need to make sure these
  67  * transactions are atomic.
  68  */
  69 static DEFINE_SPINLOCK(orion5x_pcie_lock);
  70
  71 static int pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
  72                         int size, u32 *val)
  73 {
  74         unsigned long flags;
  75         int ret;
  76
  77         if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
  78                 *val = 0xffffffff;
  79                 return PCIBIOS_DEVICE_NOT_FOUND;
  80         }
  81
  82         spin_lock_irqsave(&orion5x_pcie_lock, flags);
  83         ret = orion_pcie_rd_conf(PCIE_BASE, bus, devfn, where, size, val);
  84         spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
  85
  86         return ret;
  87 }
  88
  89 static int pcie_rd_conf_wa(struct pci_bus *bus, u32 devfn,
  90                            int where, int size, u32 *val)
  91 {
  92         int ret;
  93
  94         if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0) {
  95                 *val = 0xffffffff;
  96                 return PCIBIOS_DEVICE_NOT_FOUND;
  97         }
  98
  99         /*
 100          * We only support access to the non-extended configuration
 101          * space when using the WA access method (or we would have to
 102          * sacrifice 256M of CPU virtual address space.)
 103          */
 104         if (where >= 0x100) {
 105                 *val = 0xffffffff;
 106                 return PCIBIOS_DEVICE_NOT_FOUND;
 107         }
 108
 109         ret = orion_pcie_rd_conf_wa((void __iomem *)ORION5X_PCIE_WA_VIRT_BASE,
 110                                     bus, devfn, where, size, val);
 111
 112         return ret;
 113 }
 114
 115 static int pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 116                         int where, int size, u32 val)
 117 {
 118         unsigned long flags;
 119         int ret;
 120
 121         if (pcie_valid_config(bus->number, PCI_SLOT(devfn)) == 0)
 122                 return PCIBIOS_DEVICE_NOT_FOUND;
 123
 124         spin_lock_irqsave(&orion5x_pcie_lock, flags);
 125         ret = orion_pcie_wr_conf(PCIE_BASE, bus, devfn, where, size, val);
 126         spin_unlock_irqrestore(&orion5x_pcie_lock, flags);
 127
 128         return ret;
 129 }
 130
 131 static struct pci_ops pcie_ops = {
 132         .read = pcie_rd_conf,
 133         .write = pcie_wr_conf,
 134 };
 135
 136
 137 static int __init pcie_setup(struct pci_sys_data *sys)
 138 {
 139         struct resource *res;
 140         int dev;
 141
 142         /*
 143          * Generic PCIe unit setup.
 144          */
 145         orion_pcie_setup(PCIE_BASE, &orion5x_mbus_dram_info);
 146
 147         /*
 148          * Check whether to apply Orion-1/Orion-NAS PCIe config
 149          * read transaction workaround.
 150          */
 151         dev = orion_pcie_dev_id(PCIE_BASE);
 152         if (dev == MV88F5181_DEV_ID || dev == MV88F5182_DEV_ID) {
 153                 printk(KERN_NOTICE "Applying Orion-1/Orion-NAS PCIe config "
 154                                    "read transaction workaround\n");
 155                 orion5x_setup_pcie_wa_win(ORION5X_PCIE_WA_PHYS_BASE,
 156                                           ORION5X_PCIE_WA_SIZE);
 157                 pcie_ops.read = pcie_rd_conf_wa;
 158         }
 159
 160         /*
 161          * Request resources.
 162          */
 163         res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
 164         if (!res)
 165                 panic("pcie_setup unable to alloc resources");
 166
 167         /*
 168          * IORESOURCE_IO
 169          */
 170         res[0].name = "PCIe I/O Space";
 171         res[0].flags = IORESOURCE_IO;
 172         res[0].start = ORION5X_PCIE_IO_BUS_BASE;
 173         res[0].end = res[0].start + ORION5X_PCIE_IO_SIZE - 1;
 174         if (request_resource(&ioport_resource, &res[0]))
 175                 panic("Request PCIe IO resource failed\n");
 176         sys->resource[0] = &res[0];
 177
 178         /*
 179          * IORESOURCE_MEM
 180          */
 181         res[1].name = "PCIe Memory Space";
 182         res[1].flags = IORESOURCE_MEM;
 183         res[1].start = ORION5X_PCIE_MEM_PHYS_BASE;
 184         res[1].end = res[1].start + ORION5X_PCIE_MEM_SIZE - 1;
 185         if (request_resource(&iomem_resource, &res[1]))
 186                 panic("Request PCIe Memory resource failed\n");
 187         sys->resource[1] = &res[1];
 188
 189         sys->resource[2] = NULL;
 190         sys->io_offset = 0;
 191
 192         return 1;
 193 }
 194
 195 /*****************************************************************************
 196  * PCI controller
 197  ****************************************************************************/
 198 #define PCI_MODE                ORION5X_PCI_REG(0xd00)
 199 #define PCI_CMD                 ORION5X_PCI_REG(0xc00)
 200 #define PCI_P2P_CONF            ORION5X_PCI_REG(0x1d14)
 201 #define PCI_CONF_ADDR           ORION5X_PCI_REG(0xc78)
 202 #define PCI_CONF_DATA           ORION5X_PCI_REG(0xc7c)
 203
 204 /*
 205  * PCI_MODE bits
 206  */
 207 #define PCI_MODE_64BIT                  (1 << 2)
 208 #define PCI_MODE_PCIX                   ((1 << 4) | (1 << 5))
 209
 210 /*
 211  * PCI_CMD bits
 212  */
 213 #define PCI_CMD_HOST_REORDER            (1 << 29)
 214
 215 /*
 216  * PCI_P2P_CONF bits
 217  */
 218 #define PCI_P2P_BUS_OFFS                16
 219 #define PCI_P2P_BUS_MASK                (0xff << PCI_P2P_BUS_OFFS)
 220 #define PCI_P2P_DEV_OFFS                24
 221 #define PCI_P2P_DEV_MASK                (0x1f << PCI_P2P_DEV_OFFS)
 222
 223 /*
 224  * PCI_CONF_ADDR bits
 225  */
 226 #define PCI_CONF_REG(reg)               ((reg) & 0xfc)
 227 #define PCI_CONF_FUNC(func)             (((func) & 0x3) << 8)
 228 #define PCI_CONF_DEV(dev)               (((dev) & 0x1f) << 11)
 229 #define PCI_CONF_BUS(bus)               (((bus) & 0xff) << 16)
 230 #define PCI_CONF_ADDR_EN                (1 << 31)
 231
 232 /*
 233  * Internal configuration space
 234  */
 235 #define PCI_CONF_FUNC_STAT_CMD          0
 236 #define PCI_CONF_REG_STAT_CMD           4
 237 #define PCIX_STAT                       0x64
 238 #define PCIX_STAT_BUS_OFFS              8
 239 #define PCIX_STAT_BUS_MASK              (0xff << PCIX_STAT_BUS_OFFS)
 240
 241 /*
 242  * PCI Address Decode Windows registers
 243  */
 244 #define PCI_BAR_SIZE_DDR_CS(n)  (((n) == 0) ? ORION5X_PCI_REG(0xc08) : \
 245                                  ((n) == 1) ? ORION5X_PCI_REG(0xd08) : \
 246                                  ((n) == 2) ? ORION5X_PCI_REG(0xc0c) : \
 247                                  ((n) == 3) ? ORION5X_PCI_REG(0xd0c) : 0)
 248 #define PCI_BAR_REMAP_DDR_CS(n) (((n) == 0) ? ORION5X_PCI_REG(0xc48) : \
 249                                  ((n) == 1) ? ORION5X_PCI_REG(0xd48) : \
 250                                  ((n) == 2) ? ORION5X_PCI_REG(0xc4c) : \
 251                                  ((n) == 3) ? ORION5X_PCI_REG(0xd4c) : 0)
 252 #define PCI_BAR_ENABLE          ORION5X_PCI_REG(0xc3c)
 253 #define PCI_ADDR_DECODE_CTRL    ORION5X_PCI_REG(0xd3c)
 254
 255 /*
 256  * PCI configuration helpers for BAR settings
 257  */
 258 #define PCI_CONF_FUNC_BAR_CS(n)         ((n) >> 1)
 259 #define PCI_CONF_REG_BAR_LO_CS(n)       (((n) & 1) ? 0x18 : 0x10)
 260 #define PCI_CONF_REG_BAR_HI_CS(n)       (((n) & 1) ? 0x1c : 0x14)
 261
 262 /*
 263  * PCI config cycles are done by programming the PCI_CONF_ADDR register
 264  * and then reading the PCI_CONF_DATA register. Need to make sure these
 265  * transactions are atomic.
 266  */
 267 static DEFINE_SPINLOCK(orion5x_pci_lock);
 268
 269 static int orion5x_pci_cardbus_mode;
 270
 271 static int orion5x_pci_local_bus_nr(void)
 272 {
 273         u32 conf = readl(PCI_P2P_CONF);
 274         return((conf & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS);
 275 }
 276
 277 static int orion5x_pci_hw_rd_conf(int bus, int dev, u32 func,
 278                                         u32 where, u32 size, u32 *val)
 279 {
 280         unsigned long flags;
 281         spin_lock_irqsave(&orion5x_pci_lock, flags);
 282
 283         writel(PCI_CONF_BUS(bus) |
 284                 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
 285                 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
 286
 287         *val = readl(PCI_CONF_DATA);
 288
 289         if (size == 1)
 290                 *val = (*val >> (8*(where & 0x3))) & 0xff;
 291         else if (size == 2)
 292                 *val = (*val >> (8*(where & 0x3))) & 0xffff;
 293
 294         spin_unlock_irqrestore(&orion5x_pci_lock, flags);
 295
 296         return PCIBIOS_SUCCESSFUL;
 297 }
 298
 299 static int orion5x_pci_hw_wr_conf(int bus, int dev, u32 func,
 300                                         u32 where, u32 size, u32 val)
 301 {
 302         unsigned long flags;
 303         int ret = PCIBIOS_SUCCESSFUL;
 304
 305         spin_lock_irqsave(&orion5x_pci_lock, flags);
 306
 307         writel(PCI_CONF_BUS(bus) |
 308                 PCI_CONF_DEV(dev) | PCI_CONF_REG(where) |
 309                 PCI_CONF_FUNC(func) | PCI_CONF_ADDR_EN, PCI_CONF_ADDR);
 310
 311         if (size == 4) {
 312                 __raw_writel(val, PCI_CONF_DATA);
 313         } else if (size == 2) {
 314                 __raw_writew(val, PCI_CONF_DATA + (where & 0x3));
 315         } else if (size == 1) {
 316                 __raw_writeb(val, PCI_CONF_DATA + (where & 0x3));
 317         } else {
 318                 ret = PCIBIOS_BAD_REGISTER_NUMBER;
 319         }
 320
 321         spin_unlock_irqrestore(&orion5x_pci_lock, flags);
 322
 323         return ret;
 324 }
 325
 326 static int orion5x_pci_valid_config(int bus, u32 devfn)
 327 {
 328         if (bus == orion5x_pci_local_bus_nr()) {
 329                 /*
 330                  * Don't go out for local device
 331                  */
 332                 if (PCI_SLOT(devfn) == 0 && PCI_FUNC(devfn) != 0)
 333                         return 0;
 334
 335                 /*
 336                  * When the PCI signals are directly connected to a
 337                  * Cardbus slot, ignore all but device IDs 0 and 1.
 338                  */
 339                 if (orion5x_pci_cardbus_mode && PCI_SLOT(devfn) > 1)
 340                         return 0;
 341         }
 342
 343         return 1;
 344 }
 345
 346 static int orion5x_pci_rd_conf(struct pci_bus *bus, u32 devfn,
 347                                 int where, int size, u32 *val)
 348 {
 349         if (!orion5x_pci_valid_config(bus->number, devfn)) {
 350                 *val = 0xffffffff;
 351                 return PCIBIOS_DEVICE_NOT_FOUND;
 352         }
 353
 354         return orion5x_pci_hw_rd_conf(bus->number, PCI_SLOT(devfn),
 355                                         PCI_FUNC(devfn), where, size, val);
 356 }
 357
 358 static int orion5x_pci_wr_conf(struct pci_bus *bus, u32 devfn,
 359                                 int where, int size, u32 val)
 360 {
 361         if (!orion5x_pci_valid_config(bus->number, devfn))
 362                 return PCIBIOS_DEVICE_NOT_FOUND;
 363
 364         return orion5x_pci_hw_wr_conf(bus->number, PCI_SLOT(devfn),
 365                                         PCI_FUNC(devfn), where, size, val);
 366 }
 367
 368 static struct pci_ops pci_ops = {
 369         .read = orion5x_pci_rd_conf,
 370         .write = orion5x_pci_wr_conf,
 371 };
 372
 373 static void __init orion5x_pci_set_bus_nr(int nr)
 374 {
 375         u32 p2p = readl(PCI_P2P_CONF);
 376
 377         if (readl(PCI_MODE) & PCI_MODE_PCIX) {
 378                 /*
 379                  * PCI-X mode
 380                  */
 381                 u32 pcix_status, bus, dev;
 382                 bus = (p2p & PCI_P2P_BUS_MASK) >> PCI_P2P_BUS_OFFS;
 383                 dev = (p2p & PCI_P2P_DEV_MASK) >> PCI_P2P_DEV_OFFS;
 384                 orion5x_pci_hw_rd_conf(bus, dev, 0, PCIX_STAT, 4, &pcix_status);
 385                 pcix_status &= ~PCIX_STAT_BUS_MASK;
 386                 pcix_status |= (nr << PCIX_STAT_BUS_OFFS);
 387                 orion5x_pci_hw_wr_conf(bus, dev, 0, PCIX_STAT, 4, pcix_status);
 388         } else {
 389                 /*
 390                  * PCI Conventional mode
 391                  */
 392                 p2p &= ~PCI_P2P_BUS_MASK;
 393                 p2p |= (nr << PCI_P2P_BUS_OFFS);
 394                 writel(p2p, PCI_P2P_CONF);
 395         }
 396 }
 397
 398 static void __init orion5x_pci_master_slave_enable(void)
 399 {
 400         int bus_nr, func, reg;
 401         u32 val;
 402
 403         bus_nr = orion5x_pci_local_bus_nr();
 404         func = PCI_CONF_FUNC_STAT_CMD;
 405         reg = PCI_CONF_REG_STAT_CMD;
 406         orion5x_pci_hw_rd_conf(bus_nr, 0, func, reg, 4, &val);
 407         val |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 408         orion5x_pci_hw_wr_conf(bus_nr, 0, func, reg, 4, val | 0x7);
 409 }
 410
 411 static void __init orion5x_setup_pci_wins(struct mbus_dram_target_info *dram)
 412 {
 413         u32 win_enable;
 414         int bus;
 415         int i;
 416
 417         /*
 418          * First, disable windows.
 419          */
 420         win_enable = 0xffffffff;
 421         writel(win_enable, PCI_BAR_ENABLE);
 422
 423         /*
 424          * Setup windows for DDR banks.
 425          */
 426         bus = orion5x_pci_local_bus_nr();
 427
 428         for (i = 0; i < dram->num_cs; i++) {
 429                 struct mbus_dram_window *cs = dram->cs + i;
 430                 u32 func = PCI_CONF_FUNC_BAR_CS(cs->cs_index);
 431                 u32 reg;
 432                 u32 val;
 433
 434                 /*
 435                  * Write DRAM bank base address register.
 436                  */
 437                 reg = PCI_CONF_REG_BAR_LO_CS(cs->cs_index);
 438                 orion5x_pci_hw_rd_conf(bus, 0, func, reg, 4, &val);
 439                 val = (cs->base & 0xfffff000) | (val & 0xfff);
 440                 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, val);
 441
 442                 /*
 443                  * Write DRAM bank size register.
 444                  */
 445                 reg = PCI_CONF_REG_BAR_HI_CS(cs->cs_index);
 446                 orion5x_pci_hw_wr_conf(bus, 0, func, reg, 4, 0);
 447                 writel((cs->size - 1) & 0xfffff000,
 448                         PCI_BAR_SIZE_DDR_CS(cs->cs_index));
 449                 writel(cs->base & 0xfffff000,
 450                         PCI_BAR_REMAP_DDR_CS(cs->cs_index));
 451
 452                 /*
 453                  * Enable decode window for this chip select.
 454                  */
 455                 win_enable &= ~(1 << cs->cs_index);
 456         }
 457
 458         /*
 459          * Re-enable decode windows.
 460          */
 461         writel(win_enable, PCI_BAR_ENABLE);
 462
 463         /*
 464          * Disable automatic update of address remaping when writing to BARs.
 465          */
 466         orion5x_setbits(PCI_ADDR_DECODE_CTRL, 1);
 467 }
 468
 469 static int __init pci_setup(struct pci_sys_data *sys)
 470 {
 471         struct resource *res;
 472
 473         /*
 474          * Point PCI unit MBUS decode windows to DRAM space.
 475          */
 476         orion5x_setup_pci_wins(&orion5x_mbus_dram_info);
 477
 478         /*
 479          * Master + Slave enable
 480          */
 481         orion5x_pci_master_slave_enable();
 482
 483         /*
 484          * Force ordering
 485          */
 486         orion5x_setbits(PCI_CMD, PCI_CMD_HOST_REORDER);
 487
 488         /*
 489          * Request resources
 490          */
 491         res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
 492         if (!res)
 493                 panic("pci_setup unable to alloc resources");
 494
 495         /*
 496          * IORESOURCE_IO
 497          */
 498         res[0].name = "PCI I/O Space";
 499         res[0].flags = IORESOURCE_IO;
 500         res[0].start = ORION5X_PCI_IO_BUS_BASE;
 501         res[0].end = res[0].start + ORION5X_PCI_IO_SIZE - 1;
 502         if (request_resource(&ioport_resource, &res[0]))
 503                 panic("Request PCI IO resource failed\n");
 504         sys->resource[0] = &res[0];
 505
 506         /*
 507          * IORESOURCE_MEM
 508          */
 509         res[1].name = "PCI Memory Space";
 510         res[1].flags = IORESOURCE_MEM;
 511         res[1].start = ORION5X_PCI_MEM_PHYS_BASE;
 512         res[1].end = res[1].start + ORION5X_PCI_MEM_SIZE - 1;
 513         if (request_resource(&iomem_resource, &res[1]))
 514                 panic("Request PCI Memory resource failed\n");
 515         sys->resource[1] = &res[1];
 516
 517         sys->resource[2] = NULL;
 518         sys->io_offset = 0;
 519
 520         return 1;
 521 }
 522
 523
 524 /*****************************************************************************
 525  * General PCIe + PCI
 526  ****************************************************************************/
 527 static void __devinit rc_pci_fixup(struct pci_dev *dev)
 528 {
 529         /*
 530          * Prevent enumeration of root complex.
 531          */
 532         if (dev->bus->parent == NULL && dev->devfn == 0) {
 533                 int i;
 534
 535                 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 536                         dev->resource[i].start = 0;
 537                         dev->resource[i].end   = 0;
 538                         dev->resource[i].flags = 0;
 539                 }
 540         }
 541 }
 542 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MARVELL, PCI_ANY_ID, rc_pci_fixup);
 543
 544 static int orion5x_pci_disabled __initdata;
 545
 546 void __init orion5x_pci_disable(void)
 547 {
 548         orion5x_pci_disabled = 1;
 549 }
 550
 551 void __init orion5x_pci_set_cardbus_mode(void)
 552 {
 553         orion5x_pci_cardbus_mode = 1;
 554 }
 555
 556 int __init orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys)
 557 {
 558         int ret = 0;
 559
 560         if (nr == 0) {
 561                 orion_pcie_set_local_bus_nr(PCIE_BASE, sys->busnr);
 562                 ret = pcie_setup(sys);
 563         } else if (nr == 1 && !orion5x_pci_disabled) {
 564                 orion5x_pci_set_bus_nr(sys->busnr);
 565                 ret = pci_setup(sys);
 566         }
 567
 568         return ret;
 569 }
 570
 571 struct pci_bus __init *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys)
 572 {
 573         struct pci_bus *bus;
 574
 575         if (nr == 0) {
 576                 bus = pci_scan_bus(sys->busnr, &pcie_ops, sys);
 577         } else if (nr == 1 && !orion5x_pci_disabled) {
 578                 bus = pci_scan_bus(sys->busnr, &pci_ops, sys);
 579         } else {
 580                 bus = NULL;
 581                 BUG();
 582         }
 583
 584         return bus;
 585 }
 586
 587 int __init orion5x_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 588 {
 589         int bus = dev->bus->number;
 590
 591         /*
 592          * PCIe endpoint?
 593          */
 594         if (orion5x_pci_disabled || bus < orion5x_pci_local_bus_nr())
 595                 return IRQ_ORION5X_PCIE0_INT;
 596
 597         return -1;
 598 }