arch/powerpc/platforms/cell/celleb_scc_pciex.c

   1 /*
   2  * Support for Celleb PCI-Express.
   3  *
   4  * (C) Copyright 2007-2008 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/pci.h>
  25 #include <linux/string.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/bootmem.h>
  29 #include <linux/delay.h>
  30 #include <linux/interrupt.h>
  31
  32 #include <asm/io.h>
  33 #include <asm/irq.h>
  34 #include <asm/iommu.h>
  35 #include <asm/byteorder.h>
  36
  37 #include "celleb_scc.h"
  38 #include "celleb_pci.h"
  39
  40 #define PEX_IN(base, off)       in_be32((void __iomem *)(base) + (off))
  41 #define PEX_OUT(base, off, data) out_be32((void __iomem *)(base) + (off), (data))
  42
  43 static void scc_pciex_io_flush(struct iowa_bus *bus)
  44 {
  45         (void)PEX_IN(bus->phb->cfg_addr, PEXDMRDEN0);
  46 }
  47
  48 /*
  49  * Memory space access to device on PCIEX
  50  */
  51 #define PCIEX_MMIO_READ(name, ret)                                      \
  52 static ret scc_pciex_##name(const PCI_IO_ADDR addr)                     \
  53 {                                                                       \
  54         ret val = __do_##name(addr);                                    \
  55         scc_pciex_io_flush(iowa_mem_find_bus(addr));                    \
  56         return val;                                                     \
  57 }
  58
  59 #define PCIEX_MMIO_READ_STR(name)                                       \
  60 static void scc_pciex_##name(const PCI_IO_ADDR addr, void *buf,         \
  61                              unsigned long count)                       \
  62 {                                                                       \
  63         __do_##name(addr, buf, count);                                  \
  64         scc_pciex_io_flush(iowa_mem_find_bus(addr));                    \
  65 }
  66
  67 PCIEX_MMIO_READ(readb, u8)
  68 PCIEX_MMIO_READ(readw, u16)
  69 PCIEX_MMIO_READ(readl, u32)
  70 PCIEX_MMIO_READ(readq, u64)
  71 PCIEX_MMIO_READ(readw_be, u16)
  72 PCIEX_MMIO_READ(readl_be, u32)
  73 PCIEX_MMIO_READ(readq_be, u64)
  74 PCIEX_MMIO_READ_STR(readsb)
  75 PCIEX_MMIO_READ_STR(readsw)
  76 PCIEX_MMIO_READ_STR(readsl)
  77
  78 static void scc_pciex_memcpy_fromio(void *dest, const PCI_IO_ADDR src,
  79                                     unsigned long n)
  80 {
  81         __do_memcpy_fromio(dest, src, n);
  82         scc_pciex_io_flush(iowa_mem_find_bus(src));
  83 }
  84
  85 /*
  86  * I/O port access to devices on PCIEX.
  87  */
  88
  89 static inline unsigned long get_bus_address(struct pci_controller *phb,
  90                                             unsigned long port)
  91 {
  92         return port - ((unsigned long)(phb->io_base_virt) - _IO_BASE);
  93 }
  94
  95 static u32 scc_pciex_read_port(struct pci_controller *phb,
  96                                unsigned long port, int size)
  97 {
  98         unsigned int byte_enable;
  99         unsigned int cmd, shift;
 100         unsigned long addr;
 101         u32 data, ret;
 102
 103         BUG_ON(((port & 0x3ul) + size) > 4);
 104
 105         addr = get_bus_address(phb, port);
 106         shift = addr & 0x3ul;
 107         byte_enable = ((1 << size) - 1) << shift;
 108         cmd = PEXDCMND_IO_READ | (byte_enable << PEXDCMND_BYTE_EN_SHIFT);
 109         PEX_OUT(phb->cfg_addr, PEXDADRS, (addr & ~0x3ul));
 110         PEX_OUT(phb->cfg_addr, PEXDCMND, cmd);
 111         data = PEX_IN(phb->cfg_addr, PEXDRDATA);
 112         ret = (data >> (shift * 8)) & (0xFFFFFFFF >> ((4 - size) * 8));
 113
 114         pr_debug("PCIEX:PIO READ:port=0x%lx, addr=0x%lx, size=%d, be=%x,"
 115                  " cmd=%x, data=%x, ret=%x\n", port, addr, size, byte_enable,
 116                  cmd, data, ret);
 117
 118         return ret;
 119 }
 120
 121 static void scc_pciex_write_port(struct pci_controller *phb,
 122                                  unsigned long port, int size, u32 val)
 123 {
 124         unsigned int byte_enable;
 125         unsigned int cmd, shift;
 126         unsigned long addr;
 127         u32 data;
 128
 129         BUG_ON(((port & 0x3ul) + size) > 4);
 130
 131         addr = get_bus_address(phb, port);
 132         shift = addr & 0x3ul;
 133         byte_enable = ((1 << size) - 1) << shift;
 134         cmd = PEXDCMND_IO_WRITE | (byte_enable << PEXDCMND_BYTE_EN_SHIFT);
 135         data = (val & (0xFFFFFFFF >> (4 - size) * 8)) << (shift * 8);
 136         PEX_OUT(phb->cfg_addr, PEXDADRS, (addr & ~0x3ul));
 137         PEX_OUT(phb->cfg_addr, PEXDCMND, cmd);
 138         PEX_OUT(phb->cfg_addr, PEXDWDATA, data);
 139
 140         pr_debug("PCIEX:PIO WRITE:port=0x%lx, addr=%lx, size=%d, val=%x,"
 141                  " be=%x, cmd=%x, data=%x\n", port, addr, size, val,
 142                  byte_enable, cmd, data);
 143 }
 144
 145 static u8 __scc_pciex_inb(struct pci_controller *phb, unsigned long port)
 146 {
 147         return (u8)scc_pciex_read_port(phb, port, 1);
 148 }
 149
 150 static u16 __scc_pciex_inw(struct pci_controller *phb, unsigned long port)
 151 {
 152         u32 data;
 153         if ((port & 0x3ul) < 3)
 154                 data = scc_pciex_read_port(phb, port, 2);
 155         else {
 156                 u32 d1 = scc_pciex_read_port(phb, port, 1);
 157                 u32 d2 = scc_pciex_read_port(phb, port + 1, 1);
 158                 data = d1 | (d2 << 8);
 159         }
 160         return (u16)data;
 161 }
 162
 163 static u32 __scc_pciex_inl(struct pci_controller *phb, unsigned long port)
 164 {
 165         unsigned int mod = port & 0x3ul;
 166         u32 data;
 167         if (mod == 0)
 168                 data = scc_pciex_read_port(phb, port, 4);
 169         else {
 170                 u32 d1 = scc_pciex_read_port(phb, port, 4 - mod);
 171                 u32 d2 = scc_pciex_read_port(phb, port + 1, mod);
 172                 data = d1 | (d2 << (mod * 8));
 173         }
 174         return data;
 175 }
 176
 177 static void __scc_pciex_outb(struct pci_controller *phb,
 178                              u8 val, unsigned long port)
 179 {
 180         scc_pciex_write_port(phb, port, 1, (u32)val);
 181 }
 182
 183 static void __scc_pciex_outw(struct pci_controller *phb,
 184                              u16 val, unsigned long port)
 185 {
 186         if ((port & 0x3ul) < 3)
 187                 scc_pciex_write_port(phb, port, 2, (u32)val);
 188         else {
 189                 u32 d1 = val & 0x000000FF;
 190                 u32 d2 = (val & 0x0000FF00) >> 8;
 191                 scc_pciex_write_port(phb, port, 1, d1);
 192                 scc_pciex_write_port(phb, port + 1, 1, d2);
 193         }
 194 }
 195
 196 static void __scc_pciex_outl(struct pci_controller *phb,
 197                              u32 val, unsigned long port)
 198 {
 199         unsigned int mod = port & 0x3ul;
 200         if (mod == 0)
 201                 scc_pciex_write_port(phb, port, 4, val);
 202         else {
 203                 u32 d1 = val & (0xFFFFFFFFul >> (mod * 8));
 204                 u32 d2 = val >> ((4 - mod) * 8);
 205                 scc_pciex_write_port(phb, port, 4 - mod, d1);
 206                 scc_pciex_write_port(phb, port + 1, mod, d2);
 207         }
 208 }
 209
 210 #define PCIEX_PIO_FUNC(size, name)                                      \
 211 static u##size scc_pciex_in##name(unsigned long port)                   \
 212 {                                                                       \
 213         struct iowa_bus *bus = iowa_pio_find_bus(port);                 \
 214         u##size data = __scc_pciex_in##name(bus->phb, port);            \
 215         scc_pciex_io_flush(bus);                                        \
 216         return data;                                                    \
 217 }                                                                       \
 218 static void scc_pciex_ins##name(unsigned long p, void *b, unsigned long c) \
 219 {                                                                       \
 220         struct iowa_bus *bus = iowa_pio_find_bus(p);                    \
 221         __le##size *dst = b;                                            \
 222         for (; c != 0; c--, dst++)                                      \
 223                 *dst = cpu_to_le##size(__scc_pciex_in##name(bus->phb, p)); \
 224         scc_pciex_io_flush(bus);                                        \
 225 }                                                                       \
 226 static void scc_pciex_out##name(u##size val, unsigned long port)        \
 227 {                                                                       \
 228         struct iowa_bus *bus = iowa_pio_find_bus(port);                 \
 229         __scc_pciex_out##name(bus->phb, val, port);                     \
 230 }                                                                       \
 231 static void scc_pciex_outs##name(unsigned long p, const void *b,        \
 232                                  unsigned long c)                       \
 233 {                                                                       \
 234         struct iowa_bus *bus = iowa_pio_find_bus(p);                    \
 235         const __le##size *src = b;                                      \
 236         for (; c != 0; c--, src++)                                      \
 237                 __scc_pciex_out##name(bus->phb, le##size##_to_cpu(*src), p); \
 238 }
 239 #define __le8 u8
 240 #define cpu_to_le8(x) (x)
 241 #define le8_to_cpu(x) (x)
 242 PCIEX_PIO_FUNC(8, b)
 243 PCIEX_PIO_FUNC(16, w)
 244 PCIEX_PIO_FUNC(32, l)
 245
 246 static struct ppc_pci_io scc_pciex_ops = {
 247         .readb = scc_pciex_readb,
 248         .readw = scc_pciex_readw,
 249         .readl = scc_pciex_readl,
 250         .readq = scc_pciex_readq,
 251         .readw_be = scc_pciex_readw_be,
 252         .readl_be = scc_pciex_readl_be,
 253         .readq_be = scc_pciex_readq_be,
 254         .readsb = scc_pciex_readsb,
 255         .readsw = scc_pciex_readsw,
 256         .readsl = scc_pciex_readsl,
 257         .memcpy_fromio = scc_pciex_memcpy_fromio,
 258         .inb = scc_pciex_inb,
 259         .inw = scc_pciex_inw,
 260         .inl = scc_pciex_inl,
 261         .outb = scc_pciex_outb,
 262         .outw = scc_pciex_outw,
 263         .outl = scc_pciex_outl,
 264         .insb = scc_pciex_insb,
 265         .insw = scc_pciex_insw,
 266         .insl = scc_pciex_insl,
 267         .outsb = scc_pciex_outsb,
 268         .outsw = scc_pciex_outsw,
 269         .outsl = scc_pciex_outsl,
 270 };
 271
 272 static int __init scc_pciex_iowa_init(struct iowa_bus *bus, void *data)
 273 {
 274         dma_addr_t dummy_page_da;
 275         void *dummy_page_va;
 276
 277         dummy_page_va = kmalloc(PAGE_SIZE, GFP_KERNEL);
 278         if (!dummy_page_va) {
 279                 pr_err("PCIEX:Alloc dummy_page_va failed\n");
 280                 return -1;
 281         }
 282
 283         dummy_page_da = dma_map_single(bus->phb->parent, dummy_page_va,
 284                                        PAGE_SIZE, DMA_FROM_DEVICE);
 285         if (dma_mapping_error(bus->phb->parent, dummy_page_da)) {
 286                 pr_err("PCIEX:Map dummy page failed.\n");
 287                 kfree(dummy_page_va);
 288                 return -1;
 289         }
 290
 291         PEX_OUT(bus->phb->cfg_addr, PEXDMRDADR0, dummy_page_da);
 292
 293         return 0;
 294 }
 295
 296 /*
 297  * config space access
 298  */
 299 #define MK_PEXDADRS(bus_no, dev_no, func_no, addr) \
 300         ((uint32_t)(((addr) & ~0x3UL) | \
 301         ((bus_no) << PEXDADRS_BUSNO_SHIFT) | \
 302         ((dev_no)  << PEXDADRS_DEVNO_SHIFT) | \
 303         ((func_no) << PEXDADRS_FUNCNO_SHIFT)))
 304
 305 #define MK_PEXDCMND_BYTE_EN(addr, size) \
 306         ((((0x1 << (size))-1) << ((addr) & 0x3)) << PEXDCMND_BYTE_EN_SHIFT)
 307 #define MK_PEXDCMND(cmd, addr, size) ((cmd) | MK_PEXDCMND_BYTE_EN(addr, size))
 308
 309 static uint32_t config_read_pciex_dev(unsigned int __iomem *base,
 310                 uint64_t bus_no, uint64_t dev_no, uint64_t func_no,
 311                 uint64_t off, uint64_t size)
 312 {
 313         uint32_t ret;
 314         uint32_t addr, cmd;
 315
 316         addr = MK_PEXDADRS(bus_no, dev_no, func_no, off);
 317         cmd = MK_PEXDCMND(PEXDCMND_CONFIG_READ, off, size);
 318         PEX_OUT(base, PEXDADRS, addr);
 319         PEX_OUT(base, PEXDCMND, cmd);
 320         ret = (PEX_IN(base, PEXDRDATA)
 321                 >> ((off & (4-size)) * 8)) & ((0x1 << (size * 8)) - 1);
 322         return ret;
 323 }
 324
 325 static void config_write_pciex_dev(unsigned int __iomem *base, uint64_t bus_no,
 326         uint64_t dev_no, uint64_t func_no, uint64_t off, uint64_t size,
 327         uint32_t data)
 328 {
 329         uint32_t addr, cmd;
 330
 331         addr = MK_PEXDADRS(bus_no, dev_no, func_no, off);
 332         cmd = MK_PEXDCMND(PEXDCMND_CONFIG_WRITE, off, size);
 333         PEX_OUT(base, PEXDADRS, addr);
 334         PEX_OUT(base, PEXDCMND, cmd);
 335         PEX_OUT(base, PEXDWDATA,
 336                 (data & ((0x1 << (size * 8)) - 1)) << ((off & (4-size)) * 8));
 337 }
 338
 339 #define MK_PEXCADRS_BYTE_EN(off, len) \
 340         ((((0x1 << (len)) - 1) << ((off) & 0x3)) << PEXCADRS_BYTE_EN_SHIFT)
 341 #define MK_PEXCADRS(cmd, addr, size) \
 342         ((cmd) | MK_PEXCADRS_BYTE_EN(addr, size) | ((addr) & ~0x3))
 343 static uint32_t config_read_pciex_rc(unsigned int __iomem *base,
 344                                      uint32_t where, uint32_t size)
 345 {
 346         PEX_OUT(base, PEXCADRS, MK_PEXCADRS(PEXCADRS_CMD_READ, where, size));
 347         return (PEX_IN(base, PEXCRDATA)
 348                 >> ((where & (4 - size)) * 8)) & ((0x1 << (size * 8)) - 1);
 349 }
 350
 351 static void config_write_pciex_rc(unsigned int __iomem *base, uint32_t where,
 352                                   uint32_t size, uint32_t val)
 353 {
 354         uint32_t data;
 355
 356         data = (val & ((0x1 << (size * 8)) - 1)) << ((where & (4 - size)) * 8);
 357         PEX_OUT(base, PEXCADRS, MK_PEXCADRS(PEXCADRS_CMD_WRITE, where, size));
 358         PEX_OUT(base, PEXCWDATA, data);
 359 }
 360
 361 /* Interfaces */
 362 /* Note: Work-around
 363  *  On SCC PCIEXC, one device is seen on all 32 dev_no.
 364  *  As SCC PCIEXC can have only one device on the bus, we look only one dev_no.
 365  * (dev_no = 1)
 366  */
 367 static int scc_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
 368                                  int where, int size, unsigned int *val)
 369 {
 370         struct pci_controller *phb = pci_bus_to_host(bus);
 371
 372         if (bus->number == phb->first_busno && PCI_SLOT(devfn) != 1) {
 373                 *val = ~0;
 374                 return PCIBIOS_DEVICE_NOT_FOUND;
 375         }
 376
 377         if (bus->number == 0 && PCI_SLOT(devfn) == 0)
 378                 *val = config_read_pciex_rc(phb->cfg_addr, where, size);
 379         else
 380                 *val = config_read_pciex_dev(phb->cfg_addr, bus->number,
 381                                 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
 382
 383         return PCIBIOS_SUCCESSFUL;
 384 }
 385
 386 static int scc_pciex_write_config(struct pci_bus *bus, unsigned int devfn,
 387                                   int where, int size, unsigned int val)
 388 {
 389         struct pci_controller *phb = pci_bus_to_host(bus);
 390
 391         if (bus->number == phb->first_busno && PCI_SLOT(devfn) != 1)
 392                 return PCIBIOS_DEVICE_NOT_FOUND;
 393
 394         if (bus->number == 0 && PCI_SLOT(devfn) == 0)
 395                 config_write_pciex_rc(phb->cfg_addr, where, size, val);
 396         else
 397                 config_write_pciex_dev(phb->cfg_addr, bus->number,
 398                         PCI_SLOT(devfn), PCI_FUNC(devfn), where, size, val);
 399         return PCIBIOS_SUCCESSFUL;
 400 }
 401
 402 static struct pci_ops scc_pciex_pci_ops = {
 403         scc_pciex_read_config,
 404         scc_pciex_write_config,
 405 };
 406
 407 static void pciex_clear_intr_all(unsigned int __iomem *base)
 408 {
 409         PEX_OUT(base, PEXAERRSTS, 0xffffffff);
 410         PEX_OUT(base, PEXPRERRSTS, 0xffffffff);
 411         PEX_OUT(base, PEXINTSTS, 0xffffffff);
 412 }
 413
 414 #if 0
 415 static void pciex_disable_intr_all(unsigned int *base)
 416 {
 417         PEX_OUT(base, PEXINTMASK,   0x0);
 418         PEX_OUT(base, PEXAERRMASK,  0x0);
 419         PEX_OUT(base, PEXPRERRMASK, 0x0);
 420         PEX_OUT(base, PEXVDMASK,    0x0);
 421 }
 422 #endif
 423
 424 static void pciex_enable_intr_all(unsigned int __iomem *base)
 425 {
 426         PEX_OUT(base, PEXINTMASK, 0x0000e7f1);
 427         PEX_OUT(base, PEXAERRMASK, 0x03ff01ff);
 428         PEX_OUT(base, PEXPRERRMASK, 0x0001010f);
 429         PEX_OUT(base, PEXVDMASK, 0x00000001);
 430 }
 431
 432 static void pciex_check_status(unsigned int __iomem *base)
 433 {
 434         uint32_t err = 0;
 435         uint32_t intsts, aerr, prerr, rcvcp, lenerr;
 436         uint32_t maea, maec;
 437
 438         intsts = PEX_IN(base, PEXINTSTS);
 439         aerr = PEX_IN(base, PEXAERRSTS);
 440         prerr = PEX_IN(base, PEXPRERRSTS);
 441         rcvcp = PEX_IN(base, PEXRCVCPLIDA);
 442         lenerr = PEX_IN(base, PEXLENERRIDA);
 443
 444         if (intsts || aerr || prerr || rcvcp || lenerr)
 445                 err = 1;
 446
 447         pr_info("PCEXC interrupt!!\n");
 448         pr_info("PEXINTSTS    :0x%08x\n", intsts);
 449         pr_info("PEXAERRSTS   :0x%08x\n", aerr);
 450         pr_info("PEXPRERRSTS  :0x%08x\n", prerr);
 451         pr_info("PEXRCVCPLIDA :0x%08x\n", rcvcp);
 452         pr_info("PEXLENERRIDA :0x%08x\n", lenerr);
 453
 454         /* print detail of Protection Error */
 455         if (intsts & 0x00004000) {
 456                 uint32_t i, n;
 457                 for (i = 0; i < 4; i++) {
 458                         n = 1 << i;
 459                         if (prerr & n) {
 460                                 maea = PEX_IN(base, PEXMAEA(i));
 461                                 maec = PEX_IN(base, PEXMAEC(i));
 462                                 pr_info("PEXMAEC%d     :0x%08x\n", i, maec);
 463                                 pr_info("PEXMAEA%d     :0x%08x\n", i, maea);
 464                         }
 465                 }
 466         }
 467
 468         if (err)
 469                 pciex_clear_intr_all(base);
 470 }
 471
 472 static irqreturn_t pciex_handle_internal_irq(int irq, void *dev_id)
 473 {
 474         struct pci_controller *phb = dev_id;
 475
 476         pr_debug("PCIEX:pciex_handle_internal_irq(irq=%d)\n", irq);
 477
 478         BUG_ON(phb->cfg_addr == NULL);
 479
 480         pciex_check_status(phb->cfg_addr);
 481
 482         return IRQ_HANDLED;
 483 }
 484
 485 static __init int celleb_setup_pciex(struct device_node *node,
 486                                      struct pci_controller *phb)
 487 {
 488         struct resource r;
 489         struct of_irq oirq;
 490         int virq;
 491
 492         /* SMMIO registers; used inside this file */
 493         if (of_address_to_resource(node, 0, &r)) {
 494                 pr_err("PCIEXC:Failed to get config resource.\n");
 495                 return 1;
 496         }
 497         phb->cfg_addr = ioremap(r.start, resource_size(&r));
 498         if (!phb->cfg_addr) {
 499                 pr_err("PCIEXC:Failed to remap SMMIO region.\n");
 500                 return 1;
 501         }
 502
 503         /* Not use cfg_data,  cmd and data regs are near address reg */
 504         phb->cfg_data = NULL;
 505
 506         /* set pci_ops */
 507         phb->ops = &scc_pciex_pci_ops;
 508
 509         /* internal interrupt handler */
 510         if (of_irq_map_one(node, 1, &oirq)) {
 511                 pr_err("PCIEXC:Failed to map irq\n");
 512                 goto error;
 513         }
 514         virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
 515                                      oirq.size);
 516         if (request_irq(virq, pciex_handle_internal_irq,
 517                         IRQF_DISABLED, "pciex", (void *)phb)) {
 518                 pr_err("PCIEXC:Failed to request irq\n");
 519                 goto error;
 520         }
 521
 522         /* enable all interrupts */
 523         pciex_clear_intr_all(phb->cfg_addr);
 524         pciex_enable_intr_all(phb->cfg_addr);
 525         /* MSI: TBD */
 526
 527         return 0;
 528
 529 error:
 530         phb->cfg_data = NULL;
 531         if (phb->cfg_addr)
 532                 iounmap(phb->cfg_addr);
 533         phb->cfg_addr = NULL;
 534         return 1;
 535 }
 536
 537 struct celleb_phb_spec celleb_pciex_spec __initdata = {
 538         .setup = celleb_setup_pciex,
 539         .ops = &scc_pciex_ops,
 540         .iowa_init = &scc_pciex_iowa_init,
 541 };