arch/powerpc/platforms/chrp/pci.c

   1 /*
   2  * CHRP pci routines.
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/pci.h>
   7 #include <linux/delay.h>
   8 #include <linux/string.h>
   9 #include <linux/init.h>
  10
  11 #include <asm/io.h>
  12 #include <asm/pgtable.h>
  13 #include <asm/irq.h>
  14 #include <asm/hydra.h>
  15 #include <asm/prom.h>
  16 #include <asm/machdep.h>
  17 #include <asm/sections.h>
  18 #include <asm/pci-bridge.h>
  19 #include <asm/grackle.h>
  20 #include <asm/rtas.h>
  21
  22 #include "chrp.h"
  23 #include "gg2.h"
  24
  25 /* LongTrail */
  26 void __iomem *gg2_pci_config_base;
  27
  28 /*
  29  * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
  30  * limit the bus number to 3 bits
  31  */
  32
  33 int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
  34                            int len, u32 *val)
  35 {
  36         volatile void __iomem *cfg_data;
  37         struct pci_controller *hose = pci_bus_to_host(bus);
  38
  39         if (bus->number > 7)
  40                 return PCIBIOS_DEVICE_NOT_FOUND;
  41         /*
  42          * Note: the caller has already checked that off is
  43          * suitably aligned and that len is 1, 2 or 4.
  44          */
  45         cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
  46         switch (len) {
  47         case 1:
  48                 *val =  in_8(cfg_data);
  49                 break;
  50         case 2:
  51                 *val = in_le16(cfg_data);
  52                 break;
  53         default:
  54                 *val = in_le32(cfg_data);
  55                 break;
  56         }
  57         return PCIBIOS_SUCCESSFUL;
  58 }
  59
  60 int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
  61                             int len, u32 val)
  62 {
  63         volatile void __iomem *cfg_data;
  64         struct pci_controller *hose = pci_bus_to_host(bus);
  65
  66         if (bus->number > 7)
  67                 return PCIBIOS_DEVICE_NOT_FOUND;
  68         /*
  69          * Note: the caller has already checked that off is
  70          * suitably aligned and that len is 1, 2 or 4.
  71          */
  72         cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
  73         switch (len) {
  74         case 1:
  75                 out_8(cfg_data, val);
  76                 break;
  77         case 2:
  78                 out_le16(cfg_data, val);
  79                 break;
  80         default:
  81                 out_le32(cfg_data, val);
  82                 break;
  83         }
  84         return PCIBIOS_SUCCESSFUL;
  85 }
  86
  87 static struct pci_ops gg2_pci_ops =
  88 {
  89         .read = gg2_read_config,
  90         .write = gg2_write_config,
  91 };
  92
  93 /*
  94  * Access functions for PCI config space using RTAS calls.
  95  */
  96 int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
  97                      int len, u32 *val)
  98 {
  99         struct pci_controller *hose = pci_bus_to_host(bus);
 100         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
 101                 | (((bus->number - hose->first_busno) & 0xff) << 16)
 102                 | (hose->global_number << 24);
 103         int ret = -1;
 104         int rval;
 105
 106         rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
 107         *val = ret;
 108         return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
 109 }
 110
 111 int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 112                       int len, u32 val)
 113 {
 114         struct pci_controller *hose = pci_bus_to_host(bus);
 115         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
 116                 | (((bus->number - hose->first_busno) & 0xff) << 16)
 117                 | (hose->global_number << 24);
 118         int rval;
 119
 120         rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
 121                          addr, len, val);
 122         return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
 123 }
 124
 125 static struct pci_ops rtas_pci_ops =
 126 {
 127         .read = rtas_read_config,
 128         .write = rtas_write_config,
 129 };
 130
 131 volatile struct Hydra __iomem *Hydra = NULL;
 132
 133 int __init
 134 hydra_init(void)
 135 {
 136         struct device_node *np;
 137         struct resource r;
 138
 139         np = of_find_node_by_name(NULL, "mac-io");
 140         if (np == NULL || of_address_to_resource(np, 0, &r)) {
 141                 of_node_put(np);
 142                 return 0;
 143         }
 144         of_node_put(np);
 145         Hydra = ioremap(r.start, resource_size(&r));
 146         printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
 147         printk("Hydra Feature_Control was %x",
 148                in_le32(&Hydra->Feature_Control));
 149         out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
 150                                            HYDRA_FC_SCSI_CELL_EN |
 151                                            HYDRA_FC_SCCA_ENABLE |
 152                                            HYDRA_FC_SCCB_ENABLE |
 153                                            HYDRA_FC_ARB_BYPASS |
 154                                            HYDRA_FC_MPIC_ENABLE |
 155                                            HYDRA_FC_SLOW_SCC_PCLK |
 156                                            HYDRA_FC_MPIC_IS_MASTER));
 157         printk(", now %x\n", in_le32(&Hydra->Feature_Control));
 158         return 1;
 159 }
 160
 161 #define PRG_CL_RESET_VALID 0x00010000
 162
 163 static void __init
 164 setup_python(struct pci_controller *hose, struct device_node *dev)
 165 {
 166         u32 __iomem *reg;
 167         u32 val;
 168         struct resource r;
 169
 170         if (of_address_to_resource(dev, 0, &r)) {
 171                 printk(KERN_ERR "No address for Python PCI controller\n");
 172                 return;
 173         }
 174
 175         /* Clear the magic go-slow bit */
 176         reg = ioremap(r.start + 0xf6000, 0x40);
 177         BUG_ON(!reg);
 178         val = in_be32(&reg[12]);
 179         if (val & PRG_CL_RESET_VALID) {
 180                 out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
 181                 in_be32(&reg[12]);
 182         }
 183         iounmap(reg);
 184
 185         setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010, 0);
 186 }
 187
 188 /* Marvell Discovery II based Pegasos 2 */
 189 static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
 190 {
 191         struct device_node *root = of_find_node_by_path("/");
 192         struct device_node *rtas;
 193
 194         rtas = of_find_node_by_name (root, "rtas");
 195         if (rtas) {
 196                 hose->ops = &rtas_pci_ops;
 197                 of_node_put(rtas);
 198         } else {
 199                 printk ("RTAS supporting Pegasos OF not found, please upgrade"
 200                         " your firmware\n");
 201         }
 202         pci_add_flags(PCI_REASSIGN_ALL_BUS);
 203         /* keep the reference to the root node */
 204 }
 205
 206 void __init
 207 chrp_find_bridges(void)
 208 {
 209         struct device_node *dev;
 210         const int *bus_range;
 211         int len, index = -1;
 212         struct pci_controller *hose;
 213         const unsigned int *dma;
 214         const char *model, *machine;
 215         int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
 216         struct device_node *root = of_find_node_by_path("/");
 217         struct resource r;
 218         /*
 219          * The PCI host bridge nodes on some machines don't have
 220          * properties to adequately identify them, so we have to
 221          * look at what sort of machine this is as well.
 222          */
 223         machine = of_get_property(root, "model", NULL);
 224         if (machine != NULL) {
 225                 is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
 226                 is_mot = strncmp(machine, "MOT", 3) == 0;
 227                 if (strncmp(machine, "Pegasos2", 8) == 0)
 228                         is_pegasos = 2;
 229                 else if (strncmp(machine, "Pegasos", 7) == 0)
 230                         is_pegasos = 1;
 231         }
 232         for (dev = root->child; dev != NULL; dev = dev->sibling) {
 233                 if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
 234                         continue;
 235                 ++index;
 236                 /* The GG2 bridge on the LongTrail doesn't have an address */
 237                 if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
 238                         printk(KERN_WARNING "Can't use %pOF: no address\n",
 239                                dev);
 240                         continue;
 241                 }
 242                 bus_range = of_get_property(dev, "bus-range", &len);
 243                 if (bus_range == NULL || len < 2 * sizeof(int)) {
 244                         printk(KERN_WARNING "Can't get bus-range for %pOF\n",
 245                                 dev);
 246                         continue;
 247                 }
 248                 if (bus_range[1] == bus_range[0])
 249                         printk(KERN_INFO "PCI bus %d", bus_range[0]);
 250                 else
 251                         printk(KERN_INFO "PCI buses %d..%d",
 252                                bus_range[0], bus_range[1]);
 253                 printk(" controlled by %pOF", dev);
 254                 if (!is_longtrail)
 255                         printk(" at %llx", (unsigned long long)r.start);
 256                 printk("\n");
 257
 258                 hose = pcibios_alloc_controller(dev);
 259                 if (!hose) {
 260                         printk("Can't allocate PCI controller structure for %pOF\n",
 261                                 dev);
 262                         continue;
 263                 }
 264                 hose->first_busno = hose->self_busno = bus_range[0];
 265                 hose->last_busno = bus_range[1];
 266
 267                 model = of_get_property(dev, "model", NULL);
 268                 if (model == NULL)
 269                         model = "<none>";
 270                 if (strncmp(model, "IBM, Python", 11) == 0) {
 271                         setup_python(hose, dev);
 272                 } else if (is_mot
 273                            || strncmp(model, "Motorola, Grackle", 17) == 0) {
 274                         setup_grackle(hose);
 275                 } else if (is_longtrail) {
 276                         void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
 277                         hose->ops = &gg2_pci_ops;
 278                         hose->cfg_data = p;
 279                         gg2_pci_config_base = p;
 280                 } else if (is_pegasos == 1) {
 281                         setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc, 0);
 282                 } else if (is_pegasos == 2) {
 283                         setup_peg2(hose, dev);
 284                 } else if (!strncmp(model, "IBM,CPC710", 10)) {
 285                         setup_indirect_pci(hose,
 286                                            r.start + 0x000f8000,
 287                                            r.start + 0x000f8010,
 288                                            0);
 289                         if (index == 0) {
 290                                 dma = of_get_property(dev, "system-dma-base",
 291                                                         &len);
 292                                 if (dma && len >= sizeof(*dma)) {
 293                                         dma = (unsigned int *)
 294                                                 (((unsigned long)dma) +
 295                                                 len - sizeof(*dma));
 296                                                 pci_dram_offset = *dma;
 297                                 }
 298                         }
 299                 } else {
 300                         printk("No methods for %pOF (model %s), using RTAS\n",
 301                                dev, model);
 302                         hose->ops = &rtas_pci_ops;
 303                 }
 304
 305                 pci_process_bridge_OF_ranges(hose, dev, index == 0);
 306
 307                 /* check the first bridge for a property that we can
 308                    use to set pci_dram_offset */
 309                 dma = of_get_property(dev, "ibm,dma-ranges", &len);
 310                 if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
 311                         pci_dram_offset = dma[2] - dma[3];
 312                         printk("pci_dram_offset = %lx\n", pci_dram_offset);
 313                 }
 314         }
 315         of_node_put(root);
 316 }
 317
 318 /* SL82C105 IDE Control/Status Register */
 319 #define SL82C105_IDECSR                0x40
 320
 321 /* Fixup for Winbond ATA quirk, required for briq mostly because the
 322  * 8259 is configured for level sensitive IRQ 14 and so wants the
 323  * ATA controller to be set to fully native mode or bad things
 324  * will happen.
 325  */
 326 static void chrp_pci_fixup_winbond_ata(struct pci_dev *sl82c105)
 327 {
 328         u8 progif;
 329
 330         /* If non-briq machines need that fixup too, please speak up */
 331         if (!machine_is(chrp) || _chrp_type != _CHRP_briq)
 332                 return;
 333
 334         if ((sl82c105->class & 5) != 5) {
 335                 printk("W83C553: Switching SL82C105 IDE to PCI native mode\n");
 336                 /* Enable SL82C105 PCI native IDE mode */
 337                 pci_read_config_byte(sl82c105, PCI_CLASS_PROG, &progif);
 338                 pci_write_config_byte(sl82c105, PCI_CLASS_PROG, progif | 0x05);
 339                 sl82c105->class |= 0x05;
 340                 /* Disable SL82C105 second port */
 341                 pci_write_config_word(sl82c105, SL82C105_IDECSR, 0x0003);
 342                 /* Clear IO BARs, they will be reassigned */
 343                 pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_0, 0);
 344                 pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_1, 0);
 345                 pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_2, 0);
 346                 pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_3, 0);
 347         }
 348 }
 349 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 350                         chrp_pci_fixup_winbond_ata);
 351
 352 /* Pegasos2 firmware version 20040810 configures the built-in IDE controller
 353  * in legacy mode, but sets the PCI registers to PCI native mode.
 354  * The chip can only operate in legacy mode, so force the PCI class into legacy
 355  * mode as well. The same fixup must be done to the class-code property in
 356  * the IDE node /pci@80000000/ide@C,1
 357  */
 358 static void chrp_pci_fixup_vt8231_ata(struct pci_dev *viaide)
 359 {
 360         u8 progif;
 361         struct pci_dev *viaisa;
 362
 363         if (!machine_is(chrp) || _chrp_type != _CHRP_Pegasos)
 364                 return;
 365         if (viaide->irq != 14)
 366                 return;
 367
 368         viaisa = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, NULL);
 369         if (!viaisa)
 370                 return;
 371         dev_info(&viaide->dev, "Fixing VIA IDE, force legacy mode on\n");
 372
 373         pci_read_config_byte(viaide, PCI_CLASS_PROG, &progif);
 374         pci_write_config_byte(viaide, PCI_CLASS_PROG, progif & ~0x5);
 375         viaide->class &= ~0x5;
 376
 377         pci_dev_put(viaisa);
 378 }
 379 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, chrp_pci_fixup_vt8231_ata);