arch/mips/pmc-sierra/yosemite/ht.c

   1 /*
   2  * Copyright 2003 PMC-Sierra
   3  * Author: Manish Lachwani (lachwani@pmc-sierra.com)
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  11  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  12  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  13  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  14  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  15  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  16  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  17  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  18  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  19  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  20  *
  21  *  You should have received a copy of the  GNU General Public License along
  22  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  23  *  675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #include <linux/types.h>
  27 #include <linux/pci.h>
  28 #include <linux/kernel.h>
  29 #include <linux/slab.h>
  30 #include <asm/pci.h>
  31 #include <asm/io.h>
  32
  33 #include <linux/init.h>
  34 #include <asm/titan_dep.h>
  35
  36 #ifdef CONFIG_HYPERTRANSPORT
  37
  38
  39 /*
  40  * This function check if the Hypertransport Link Initialization completed. If
  41  * it did, then proceed further with scanning bus #2
  42  */
  43 static __inline__ int check_titan_htlink(void)
  44 {
  45         u32 val;
  46
  47         val = *(volatile uint32_t *)(RM9000x2_HTLINK_REG);
  48         if (val & 0x00000020)
  49                 /* HT Link Initialization completed */
  50                 return 1;
  51         else
  52                 return 0;
  53 }
  54
  55 static int titan_ht_config_read_dword(struct pci_dev *device,
  56                                              int offset, u32* val)
  57 {
  58         int dev, bus, func;
  59         uint32_t address_reg, data_reg;
  60         uint32_t address;
  61
  62         bus = device->bus->number;
  63         dev = PCI_SLOT(device->devfn);
  64         func = PCI_FUNC(device->devfn);
  65
  66         /* XXX Need to change the Bus # */
  67         if (bus > 2)
  68                 address = (bus << 16) | (dev << 11) | (func << 8) | (offset & 0xfc) |
  69                                                         0x80000000 | 0x1;
  70         else
  71                 address = (dev << 11) | (func << 8) | (offset & 0xfc) | 0x80000000;
  72
  73         address_reg = RM9000x2_OCD_HTCFGA;
  74         data_reg =  RM9000x2_OCD_HTCFGD;
  75
  76         RM9K_WRITE(address_reg, address);
  77         RM9K_READ(data_reg, val);
  78
  79         return PCIBIOS_SUCCESSFUL;
  80 }
  81
  82
  83 static int titan_ht_config_read_word(struct pci_dev *device,
  84                                              int offset, u16* val)
  85 {
  86         int dev, bus, func;
  87         uint32_t address_reg, data_reg;
  88         uint32_t address;
  89
  90         bus = device->bus->number;
  91         dev = PCI_SLOT(device->devfn);
  92         func = PCI_FUNC(device->devfn);
  93
  94         /* XXX Need to change the Bus # */
  95         if (bus > 2)
  96                 address = (bus << 16) | (dev << 11) | (func << 8) | (offset & 0xfc) |
  97                                                 0x80000000 | 0x1;
  98         else
  99                 address = (dev << 11) | (func << 8) | (offset & 0xfc) | 0x80000000;
 100
 101         address_reg = RM9000x2_OCD_HTCFGA;
 102         data_reg =  RM9000x2_OCD_HTCFGD;
 103
 104         if ((offset & 0x3) == 0)
 105                 offset = 0x2;
 106         else
 107                 offset = 0x0;
 108
 109         RM9K_WRITE(address_reg, address);
 110         RM9K_READ_16(data_reg + offset, val);
 111
 112         return PCIBIOS_SUCCESSFUL;
 113 }
 114
 115
 116 u32 longswap(unsigned long l)
 117 {
 118         unsigned char b1, b2, b3, b4;
 119
 120         b1 = l&255;
 121         b2 = (l>>8)&255;
 122         b3 = (l>>16)&255;
 123         b4 = (l>>24)&255;
 124
 125         return ((b1<<24) + (b2<<16) + (b3<<8) + b4);
 126 }
 127
 128
 129 static int titan_ht_config_read_byte(struct pci_dev *device,
 130                                              int offset, u8* val)
 131 {
 132         int dev, bus, func;
 133         uint32_t address_reg, data_reg;
 134         uint32_t address;
 135         int offset1;
 136
 137         bus = device->bus->number;
 138         dev = PCI_SLOT(device->devfn);
 139         func = PCI_FUNC(device->devfn);
 140
 141         /* XXX Need to change the Bus # */
 142         if (bus > 2)
 143                 address = (bus << 16) | (dev << 11) | (func << 8) | (offset & 0xfc) |
 144                                                         0x80000000 | 0x1;
 145         else
 146                 address = (dev << 11) | (func << 8) | (offset & 0xfc) | 0x80000000;
 147
 148         address_reg = RM9000x2_OCD_HTCFGA;
 149         data_reg =  RM9000x2_OCD_HTCFGD;
 150
 151         RM9K_WRITE(address_reg, address);
 152
 153         if ((offset & 0x3) == 0) {
 154                 offset1 = 0x3;
 155         }
 156         if ((offset & 0x3) == 1) {
 157                 offset1 = 0x2;
 158         }
 159         if ((offset & 0x3) == 2) {
 160                 offset1 = 0x1;
 161         }
 162         if ((offset & 0x3) == 3) {
 163                 offset1 = 0x0;
 164         }
 165         RM9K_READ_8(data_reg + offset1, val);
 166
 167         return PCIBIOS_SUCCESSFUL;
 168 }
 169
 170
 171 static int titan_ht_config_write_dword(struct pci_dev *device,
 172                                              int offset, u8 val)
 173 {
 174         int dev, bus, func;
 175         uint32_t address_reg, data_reg;
 176         uint32_t address;
 177
 178         bus = device->bus->number;
 179         dev = PCI_SLOT(device->devfn);
 180         func = PCI_FUNC(device->devfn);
 181
 182         /* XXX Need to change the Bus # */
 183         if (bus > 2)
 184                 address = (bus << 16) | (dev << 11) | (func << 8) | (offset & 0xfc) |
 185                                                         0x80000000 | 0x1;
 186         else
 187               address = (dev << 11) | (func << 8) | (offset & 0xfc) | 0x80000000;
 188
 189         address_reg = RM9000x2_OCD_HTCFGA;
 190         data_reg =  RM9000x2_OCD_HTCFGD;
 191
 192         RM9K_WRITE(address_reg, address);
 193         RM9K_WRITE(data_reg, val);
 194
 195         return PCIBIOS_SUCCESSFUL;
 196 }
 197
 198 static int titan_ht_config_write_word(struct pci_dev *device,
 199                                              int offset, u8 val)
 200 {
 201         int dev, bus, func;
 202         uint32_t address_reg, data_reg;
 203         uint32_t address;
 204
 205         bus = device->bus->number;
 206         dev = PCI_SLOT(device->devfn);
 207         func = PCI_FUNC(device->devfn);
 208
 209         /* XXX Need to change the Bus # */
 210         if (bus > 2)
 211                 address = (bus << 16) | (dev << 11) | (func << 8) | (offset & 0xfc) |
 212                                 0x80000000 | 0x1;
 213         else
 214                 address = (dev << 11) | (func << 8) | (offset & 0xfc) | 0x80000000;
 215
 216         address_reg = RM9000x2_OCD_HTCFGA;
 217         data_reg =  RM9000x2_OCD_HTCFGD;
 218
 219         if ((offset & 0x3) == 0)
 220                 offset = 0x2;
 221         else
 222                 offset = 0x0;
 223
 224         RM9K_WRITE(address_reg, address);
 225         RM9K_WRITE_16(data_reg + offset, val);
 226
 227         return PCIBIOS_SUCCESSFUL;
 228 }
 229
 230 static int titan_ht_config_write_byte(struct pci_dev *device,
 231                                              int offset, u8 val)
 232 {
 233         int dev, bus, func;
 234         uint32_t address_reg, data_reg;
 235         uint32_t address;
 236         int offset1;
 237
 238         bus = device->bus->number;
 239         dev = PCI_SLOT(device->devfn);
 240         func = PCI_FUNC(device->devfn);
 241
 242         /* XXX Need to change the Bus # */
 243         if (bus > 2)
 244                 address = (bus << 16) | (dev << 11) | (func << 8) | (offset & 0xfc) |
 245                                 0x80000000 | 0x1;
 246         else
 247                 address = (dev << 11) | (func << 8) | (offset & 0xfc) | 0x80000000;
 248
 249         address_reg = RM9000x2_OCD_HTCFGA;
 250         data_reg =  RM9000x2_OCD_HTCFGD;
 251
 252         RM9K_WRITE(address_reg, address);
 253
 254         if ((offset & 0x3) == 0) {
 255              offset1 = 0x3;
 256         }
 257         if ((offset & 0x3) == 1) {
 258              offset1 = 0x2;
 259         }
 260         if ((offset & 0x3) == 2) {
 261              offset1 = 0x1;
 262         }
 263         if ((offset & 0x3) == 3) {
 264             offset1 = 0x0;
 265         }
 266
 267         RM9K_WRITE_8(data_reg + offset1, val);
 268         return PCIBIOS_SUCCESSFUL;
 269 }
 270
 271
 272 static void titan_pcibios_set_master(struct pci_dev *dev)
 273 {
 274         u16 cmd;
 275         int bus = dev->bus->number;
 276
 277         if (check_titan_htlink())
 278             titan_ht_config_read_word(dev, PCI_COMMAND, &cmd);
 279
 280         cmd |= PCI_COMMAND_MASTER;
 281
 282         if (check_titan_htlink())
 283             titan_ht_config_write_word(dev, PCI_COMMAND, cmd);
 284 }
 285
 286
 287 int pcibios_enable_resources(struct pci_dev *dev)
 288 {
 289         u16 cmd, old_cmd;
 290         u8 tmp1;
 291         int idx;
 292         struct resource *r;
 293         int bus = dev->bus->number;
 294
 295         if (check_titan_htlink())
 296             titan_ht_config_read_word(dev, PCI_COMMAND, &cmd);
 297
 298         old_cmd = cmd;
 299         for (idx = 0; idx < 6; idx++) {
 300                 r = &dev->resource[idx];
 301                 if (!r->start && r->end) {
 302                         printk(KERN_ERR
 303                                "PCI: Device %s not available because of "
 304                                "resource collisions\n", pci_name(dev));
 305                         return -EINVAL;
 306                 }
 307                 if (r->flags & IORESOURCE_IO)
 308                         cmd |= PCI_COMMAND_IO;
 309                 if (r->flags & IORESOURCE_MEM)
 310                         cmd |= PCI_COMMAND_MEMORY;
 311         }
 312         if (cmd != old_cmd) {
 313                 if (check_titan_htlink())
 314                    titan_ht_config_write_word(dev, PCI_COMMAND, cmd);
 315         }
 316
 317         if (check_titan_htlink())
 318                 titan_ht_config_read_byte(dev, PCI_CACHE_LINE_SIZE, &tmp1);
 319
 320         if (tmp1 != 8) {
 321                 printk(KERN_WARNING "PCI setting cache line size to 8 from "
 322                        "%d\n", tmp1);
 323         }
 324
 325         if (check_titan_htlink())
 326                 titan_ht_config_write_byte(dev, PCI_CACHE_LINE_SIZE, 8);
 327
 328         if (check_titan_htlink())
 329                 titan_ht_config_read_byte(dev, PCI_LATENCY_TIMER, &tmp1);
 330
 331         if (tmp1 < 32 || tmp1 == 0xff) {
 332                 printk(KERN_WARNING "PCI setting latency timer to 32 from %d\n",
 333                        tmp1);
 334         }
 335
 336         if (check_titan_htlink())
 337                 titan_ht_config_write_byte(dev, PCI_LATENCY_TIMER, 32);
 338
 339         return 0;
 340 }
 341
 342
 343 int pcibios_enable_device(struct pci_dev *dev, int mask)
 344 {
 345         return pcibios_enable_resources(dev);
 346 }
 347
 348 void pcibios_align_resource(void *data, struct resource *res,
 349                             resource_size_t size, resource_size_t align)
 350 {
 351         struct pci_dev *dev = data;
 352
 353         if (res->flags & IORESOURCE_IO) {
 354                 resource_size_t start = res->start;
 355
 356                 /* We need to avoid collisions with `mirrored' VGA ports
 357                    and other strange ISA hardware, so we always want the
 358                    addresses kilobyte aligned.  */
 359                 if (size > 0x100) {
 360                         printk(KERN_ERR "PCI: I/O Region %s/%d too large"
 361                                " (%ld bytes)\n", pci_name(dev),
 362                                 dev->resource - res, size);
 363                 }
 364
 365                 start = (start + 1024 - 1) & ~(1024 - 1);
 366                 res->start = start;
 367         }
 368 }
 369
 370 struct pci_ops titan_pci_ops = {
 371         titan_ht_config_read_byte,
 372         titan_ht_config_read_word,
 373         titan_ht_config_read_dword,
 374         titan_ht_config_write_byte,
 375         titan_ht_config_write_word,
 376         titan_ht_config_write_dword
 377 };
 378
 379 void __init pcibios_fixup_bus(struct pci_bus *c)
 380 {
 381         titan_ht_pcibios_fixup_bus(c);
 382 }
 383
 384 void __init pcibios_init(void)
 385 {
 386
 387         /* Reset PCI I/O and PCI MEM values */
 388         /* XXX Need to add the proper values here */
 389         ioport_resource.start = 0xe0000000;
 390         ioport_resource.end   = 0xe0000000 + 0x20000000 - 1;
 391         iomem_resource.start  = 0xc0000000;
 392         iomem_resource.end    = 0xc0000000 + 0x20000000 - 1;
 393
 394         /* XXX Need to add bus values */
 395         pci_scan_bus(2, &titan_pci_ops, NULL);
 396         pci_scan_bus(3, &titan_pci_ops, NULL);
 397 }
 398
 399 /*
 400  * for parsing "pci=" kernel boot arguments.
 401  */
 402 char *pcibios_setup(char *str)
 403 {
 404         printk(KERN_INFO "rr: pcibios_setup\n");
 405         /* Nothing to do for now.  */
 406
 407         return str;
 408 }
 409
 410 unsigned __init int pcibios_assign_all_busses(void)
 411 {
 412         /* We want to use the PCI bus detection done by PMON */
 413         return 0;
 414 }
 415
 416 #endif /* CONFIG_HYPERTRANSPORT */