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 = bus->sysdata;
  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 = bus->sysdata;
  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 = bus->sysdata;
 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 = bus->sysdata;
 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         Hydra = ioremap(r.start, r.end-r.start);
 145         printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
 146         printk("Hydra Feature_Control was %x",
 147                in_le32(&Hydra->Feature_Control));
 148         out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
 149                                            HYDRA_FC_SCSI_CELL_EN |
 150                                            HYDRA_FC_SCCA_ENABLE |
 151                                            HYDRA_FC_SCCB_ENABLE |
 152                                            HYDRA_FC_ARB_BYPASS |
 153                                            HYDRA_FC_MPIC_ENABLE |
 154                                            HYDRA_FC_SLOW_SCC_PCLK |
 155                                            HYDRA_FC_MPIC_IS_MASTER));
 156         printk(", now %x\n", in_le32(&Hydra->Feature_Control));
 157         return 1;
 158 }
 159
 160 #define PRG_CL_RESET_VALID 0x00010000
 161
 162 static void __init
 163 setup_python(struct pci_controller *hose, struct device_node *dev)
 164 {
 165         u32 __iomem *reg;
 166         u32 val;
 167         struct resource r;
 168
 169         if (of_address_to_resource(dev, 0, &r)) {
 170                 printk(KERN_ERR "No address for Python PCI controller\n");
 171                 return;
 172         }
 173
 174         /* Clear the magic go-slow bit */
 175         reg = ioremap(r.start + 0xf6000, 0x40);
 176         BUG_ON(!reg);
 177         val = in_be32(&reg[12]);
 178         if (val & PRG_CL_RESET_VALID) {
 179                 out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
 180                 in_be32(&reg[12]);
 181         }
 182         iounmap(reg);
 183
 184         setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010, 0);
 185 }
 186
 187 /* Marvell Discovery II based Pegasos 2 */
 188 static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
 189 {
 190         struct device_node *root = of_find_node_by_path("/");
 191         struct device_node *rtas;
 192
 193         rtas = of_find_node_by_name (root, "rtas");
 194         if (rtas) {
 195                 hose->ops = &rtas_pci_ops;
 196                 of_node_put(rtas);
 197         } else {
 198                 printk ("RTAS supporting Pegasos OF not found, please upgrade"
 199                         " your firmware\n");
 200         }
 201         pci_assign_all_buses = 1;
 202         /* keep the reference to the root node */
 203 }
 204
 205 void __init
 206 chrp_find_bridges(void)
 207 {
 208         struct device_node *dev;
 209         const int *bus_range;
 210         int len, index = -1;
 211         struct pci_controller *hose;
 212         const unsigned int *dma;
 213         const char *model, *machine;
 214         int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
 215         struct device_node *root = of_find_node_by_path("/");
 216         struct resource r;
 217         /*
 218          * The PCI host bridge nodes on some machines don't have
 219          * properties to adequately identify them, so we have to
 220          * look at what sort of machine this is as well.
 221          */
 222         machine = of_get_property(root, "model", NULL);
 223         if (machine != NULL) {
 224                 is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
 225                 is_mot = strncmp(machine, "MOT", 3) == 0;
 226                 if (strncmp(machine, "Pegasos2", 8) == 0)
 227                         is_pegasos = 2;
 228                 else if (strncmp(machine, "Pegasos", 7) == 0)
 229                         is_pegasos = 1;
 230         }
 231         for (dev = root->child; dev != NULL; dev = dev->sibling) {
 232                 if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
 233                         continue;
 234                 ++index;
 235                 /* The GG2 bridge on the LongTrail doesn't have an address */
 236                 if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
 237                         printk(KERN_WARNING "Can't use %s: no address\n",
 238                                dev->full_name);
 239                         continue;
 240                 }
 241                 bus_range = of_get_property(dev, "bus-range", &len);
 242                 if (bus_range == NULL || len < 2 * sizeof(int)) {
 243                         printk(KERN_WARNING "Can't get bus-range for %s\n",
 244                                 dev->full_name);
 245                         continue;
 246                 }
 247                 if (bus_range[1] == bus_range[0])
 248                         printk(KERN_INFO "PCI bus %d", bus_range[0]);
 249                 else
 250                         printk(KERN_INFO "PCI buses %d..%d",
 251                                bus_range[0], bus_range[1]);
 252                 printk(" controlled by %s", dev->full_name);
 253                 if (!is_longtrail)
 254                         printk(" at %llx", (unsigned long long)r.start);
 255                 printk("\n");
 256
 257                 hose = pcibios_alloc_controller(dev);
 258                 if (!hose) {
 259                         printk("Can't allocate PCI controller structure for %s\n",
 260                                 dev->full_name);
 261                         continue;
 262                 }
 263                 hose->first_busno = bus_range[0];
 264                 hose->last_busno = bus_range[1];
 265
 266                 model = of_get_property(dev, "model", NULL);
 267                 if (model == NULL)
 268                         model = "<none>";
 269                 if (of_device_is_compatible(dev, "IBM,python")) {
 270                         setup_python(hose, dev);
 271                 } else if (is_mot
 272                            || strncmp(model, "Motorola, Grackle", 17) == 0) {
 273                         setup_grackle(hose);
 274                 } else if (is_longtrail) {
 275                         void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
 276                         hose->ops = &gg2_pci_ops;
 277                         hose->cfg_data = p;
 278                         gg2_pci_config_base = p;
 279                 } else if (is_pegasos == 1) {
 280                         setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc, 0);
 281                 } else if (is_pegasos == 2) {
 282                         setup_peg2(hose, dev);
 283                 } else if (!strncmp(model, "IBM,CPC710", 10)) {
 284                         setup_indirect_pci(hose,
 285                                            r.start + 0x000f8000,
 286                                            r.start + 0x000f8010,
 287                                            0);
 288                         if (index == 0) {
 289                                 dma = of_get_property(dev, "system-dma-base",
 290                                                         &len);
 291                                 if (dma && len >= sizeof(*dma)) {
 292                                         dma = (unsigned int *)
 293                                                 (((unsigned long)dma) +
 294                                                 len - sizeof(*dma));
 295                                                 pci_dram_offset = *dma;
 296                                 }
 297                         }
 298                 } else {
 299                         printk("No methods for %s (model %s), using RTAS\n",
 300                                dev->full_name, model);
 301                         hose->ops = &rtas_pci_ops;
 302                 }
 303
 304                 pci_process_bridge_OF_ranges(hose, dev, index == 0);
 305
 306                 /* check the first bridge for a property that we can
 307                    use to set pci_dram_offset */
 308                 dma = of_get_property(dev, "ibm,dma-ranges", &len);
 309                 if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
 310                         pci_dram_offset = dma[2] - dma[3];
 311                         printk("pci_dram_offset = %lx\n", pci_dram_offset);
 312                 }
 313         }
 314         of_node_put(root);
 315 }
 316
 317 /* SL82C105 IDE Control/Status Register */
 318 #define SL82C105_IDECSR                0x40
 319
 320 /* Fixup for Winbond ATA quirk, required for briq */
 321 void chrp_pci_fixup_winbond_ata(struct pci_dev *sl82c105)
 322 {
 323         u8 progif;
 324
 325         /* If non-briq machines need that fixup too, please speak up */
 326         if (!machine_is(chrp) || _chrp_type != _CHRP_briq)
 327                 return;
 328
 329         if ((sl82c105->class & 5) != 5) {
 330                 printk("W83C553: Switching SL82C105 IDE to PCI native mode\n");
 331                 /* Enable SL82C105 PCI native IDE mode */
 332                 pci_read_config_byte(sl82c105, PCI_CLASS_PROG, &progif);
 333                 pci_write_config_byte(sl82c105, PCI_CLASS_PROG, progif | 0x05);
 334                 sl82c105->class |= 0x05;
 335                 /* Disable SL82C105 second port */
 336                 pci_write_config_word(sl82c105, SL82C105_IDECSR, 0x0003);
 337         }
 338 }
 339 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 340                 chrp_pci_fixup_winbond_ata);
 341
 342 /* Pegasos2 firmware version 20040810 configures the built-in IDE controller
 343  * in legacy mode, but sets the PCI registers to PCI native mode.
 344  * The chip can only operate in legacy mode, so force the PCI class into legacy
 345  * mode as well. The same fixup must be done to the class-code property in
 346  * the IDE node /pci@80000000/ide@C,1
 347  */
 348 static void chrp_pci_fixup_vt8231_ata(struct pci_dev *viaide)
 349 {
 350         u8 progif;
 351         struct pci_dev *viaisa;
 352
 353         if (!machine_is(chrp) || _chrp_type != _CHRP_Pegasos)
 354                 return;
 355         if (viaide->irq != 14)
 356                 return;
 357
 358         viaisa = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, NULL);
 359         if (!viaisa)
 360                 return;
 361         printk("Fixing VIA IDE, force legacy mode on '%s'\n", viaide->dev.bus_id);
 362
 363         pci_read_config_byte(viaide, PCI_CLASS_PROG, &progif);
 364         pci_write_config_byte(viaide, PCI_CLASS_PROG, progif & ~0x5);
 365         viaide->class &= ~0x5;
 366
 367         pci_dev_put(viaisa);
 368 }
 369 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, chrp_pci_fixup_vt8231_ata);