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 #include <linux/ide.h>
  11
  12 #include <asm/io.h>
  13 #include <asm/pgtable.h>
  14 #include <asm/irq.h>
  15 #include <asm/hydra.h>
  16 #include <asm/prom.h>
  17 #include <asm/gg2.h>
  18 #include <asm/machdep.h>
  19 #include <asm/sections.h>
  20 #include <asm/pci-bridge.h>
  21 #include <asm/grackle.h>
  22 #include <asm/rtas.h>
  23
  24 #include "chrp.h"
  25
  26 /* LongTrail */
  27 void __iomem *gg2_pci_config_base;
  28
  29 /*
  30  * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
  31  * limit the bus number to 3 bits
  32  */
  33
  34 int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
  35                            int len, u32 *val)
  36 {
  37         volatile void __iomem *cfg_data;
  38         struct pci_controller *hose = bus->sysdata;
  39
  40         if (bus->number > 7)
  41                 return PCIBIOS_DEVICE_NOT_FOUND;
  42         /*
  43          * Note: the caller has already checked that off is
  44          * suitably aligned and that len is 1, 2 or 4.
  45          */
  46         cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
  47         switch (len) {
  48         case 1:
  49                 *val =  in_8(cfg_data);
  50                 break;
  51         case 2:
  52                 *val = in_le16(cfg_data);
  53                 break;
  54         default:
  55                 *val = in_le32(cfg_data);
  56                 break;
  57         }
  58         return PCIBIOS_SUCCESSFUL;
  59 }
  60
  61 int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
  62                             int len, u32 val)
  63 {
  64         volatile void __iomem *cfg_data;
  65         struct pci_controller *hose = bus->sysdata;
  66
  67         if (bus->number > 7)
  68                 return PCIBIOS_DEVICE_NOT_FOUND;
  69         /*
  70          * Note: the caller has already checked that off is
  71          * suitably aligned and that len is 1, 2 or 4.
  72          */
  73         cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
  74         switch (len) {
  75         case 1:
  76                 out_8(cfg_data, val);
  77                 break;
  78         case 2:
  79                 out_le16(cfg_data, val);
  80                 break;
  81         default:
  82                 out_le32(cfg_data, val);
  83                 break;
  84         }
  85         return PCIBIOS_SUCCESSFUL;
  86 }
  87
  88 static struct pci_ops gg2_pci_ops =
  89 {
  90         gg2_read_config,
  91         gg2_write_config
  92 };
  93
  94 /*
  95  * Access functions for PCI config space using RTAS calls.
  96  */
  97 int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
  98                      int len, u32 *val)
  99 {
 100         struct pci_controller *hose = bus->sysdata;
 101         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
 102                 | (((bus->number - hose->first_busno) & 0xff) << 16)
 103                 | (hose->index << 24);
 104         int ret = -1;
 105         int rval;
 106
 107         rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
 108         *val = ret;
 109         return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
 110 }
 111
 112 int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 113                       int len, u32 val)
 114 {
 115         struct pci_controller *hose = bus->sysdata;
 116         unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
 117                 | (((bus->number - hose->first_busno) & 0xff) << 16)
 118                 | (hose->index << 24);
 119         int rval;
 120
 121         rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
 122                          addr, len, val);
 123         return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
 124 }
 125
 126 static struct pci_ops rtas_pci_ops =
 127 {
 128         rtas_read_config,
 129         rtas_write_config
 130 };
 131
 132 volatile struct Hydra __iomem *Hydra = NULL;
 133
 134 int __init
 135 hydra_init(void)
 136 {
 137         struct device_node *np;
 138         struct resource r;
 139
 140         np = find_devices("mac-io");
 141         if (np == NULL || of_address_to_resource(np, 0, &r))
 142                 return 0;
 143         Hydra = ioremap(r.start, r.end-r.start);
 144         printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
 145         printk("Hydra Feature_Control was %x",
 146                in_le32(&Hydra->Feature_Control));
 147         out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
 148                                            HYDRA_FC_SCSI_CELL_EN |
 149                                            HYDRA_FC_SCCA_ENABLE |
 150                                            HYDRA_FC_SCCB_ENABLE |
 151                                            HYDRA_FC_ARB_BYPASS |
 152                                            HYDRA_FC_MPIC_ENABLE |
 153                                            HYDRA_FC_SLOW_SCC_PCLK |
 154                                            HYDRA_FC_MPIC_IS_MASTER));
 155         printk(", now %x\n", in_le32(&Hydra->Feature_Control));
 156         return 1;
 157 }
 158
 159 #define PRG_CL_RESET_VALID 0x00010000
 160
 161 static void __init
 162 setup_python(struct pci_controller *hose, struct device_node *dev)
 163 {
 164         u32 __iomem *reg;
 165         u32 val;
 166         struct resource r;
 167
 168         if (of_address_to_resource(dev, 0, &r)) {
 169                 printk(KERN_ERR "No address for Python PCI controller\n");
 170                 return;
 171         }
 172
 173         /* Clear the magic go-slow bit */
 174         reg = ioremap(r.start + 0xf6000, 0x40);
 175         BUG_ON(!reg);
 176         val = in_be32(&reg[12]);
 177         if (val & PRG_CL_RESET_VALID) {
 178                 out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
 179                 in_be32(&reg[12]);
 180         }
 181         iounmap(reg);
 182
 183         setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010);
 184 }
 185
 186 /* Marvell Discovery II based Pegasos 2 */
 187 static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
 188 {
 189         struct device_node *root = find_path_device("/");
 190         struct device_node *rtas;
 191
 192         of_node_get(root);
 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 }
 203
 204 void __init
 205 chrp_find_bridges(void)
 206 {
 207         struct device_node *dev;
 208         const int *bus_range;
 209         int len, index = -1;
 210         struct pci_controller *hose;
 211         const unsigned int *dma;
 212         const char *model, *machine;
 213         int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
 214         struct device_node *root = find_path_device("/");
 215         struct resource r;
 216         /*
 217          * The PCI host bridge nodes on some machines don't have
 218          * properties to adequately identify them, so we have to
 219          * look at what sort of machine this is as well.
 220          */
 221         machine = get_property(root, "model", NULL);
 222         if (machine != NULL) {
 223                 is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
 224                 is_mot = strncmp(machine, "MOT", 3) == 0;
 225                 if (strncmp(machine, "Pegasos2", 8) == 0)
 226                         is_pegasos = 2;
 227                 else if (strncmp(machine, "Pegasos", 7) == 0)
 228                         is_pegasos = 1;
 229         }
 230         for (dev = root->child; dev != NULL; dev = dev->sibling) {
 231                 if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
 232                         continue;
 233                 ++index;
 234                 /* The GG2 bridge on the LongTrail doesn't have an address */
 235                 if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
 236                         printk(KERN_WARNING "Can't use %s: no address\n",
 237                                dev->full_name);
 238                         continue;
 239                 }
 240                 bus_range = get_property(dev, "bus-range", &len);
 241                 if (bus_range == NULL || len < 2 * sizeof(int)) {
 242                         printk(KERN_WARNING "Can't get bus-range for %s\n",
 243                                 dev->full_name);
 244                         continue;
 245                 }
 246                 if (bus_range[1] == bus_range[0])
 247                         printk(KERN_INFO "PCI bus %d", bus_range[0]);
 248                 else
 249                         printk(KERN_INFO "PCI buses %d..%d",
 250                                bus_range[0], bus_range[1]);
 251                 printk(" controlled by %s", dev->full_name);
 252                 if (!is_longtrail)
 253                         printk(" at %llx", (unsigned long long)r.start);
 254                 printk("\n");
 255
 256                 hose = pcibios_alloc_controller();
 257                 if (!hose) {
 258                         printk("Can't allocate PCI controller structure for %s\n",
 259                                 dev->full_name);
 260                         continue;
 261                 }
 262                 hose->arch_data = dev;
 263                 hose->first_busno = bus_range[0];
 264                 hose->last_busno = bus_range[1];
 265
 266                 model = get_property(dev, "model", NULL);
 267                 if (model == NULL)
 268                         model = "<none>";
 269                 if (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);
 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                         if (index == 0) {
 288                                 dma = get_property(dev, "system-dma-base",&len);
 289                                 if (dma && len >= sizeof(*dma)) {
 290                                         dma = (unsigned int *)
 291                                                 (((unsigned long)dma) +
 292                                                 len - sizeof(*dma));
 293                                                 pci_dram_offset = *dma;
 294                                 }
 295                         }
 296                 } else {
 297                         printk("No methods for %s (model %s), using RTAS\n",
 298                                dev->full_name, model);
 299                         hose->ops = &rtas_pci_ops;
 300                 }
 301
 302                 pci_process_bridge_OF_ranges(hose, dev, index == 0);
 303
 304                 /* check the first bridge for a property that we can
 305                    use to set pci_dram_offset */
 306                 dma = get_property(dev, "ibm,dma-ranges", &len);
 307                 if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
 308                         pci_dram_offset = dma[2] - dma[3];
 309                         printk("pci_dram_offset = %lx\n", pci_dram_offset);
 310                 }
 311         }
 312 }
 313
 314 /* SL82C105 IDE Control/Status Register */
 315 #define SL82C105_IDECSR                0x40
 316
 317 /* Fixup for Winbond ATA quirk, required for briq */
 318 void chrp_pci_fixup_winbond_ata(struct pci_dev *sl82c105)
 319 {
 320         u8 progif;
 321
 322         /* If non-briq machines need that fixup too, please speak up */
 323         if (!machine_is(chrp) || _chrp_type != _CHRP_briq)
 324                 return;
 325
 326         if ((sl82c105->class & 5) != 5) {
 327                 printk("W83C553: Switching SL82C105 IDE to PCI native mode\n");
 328                 /* Enable SL82C105 PCI native IDE mode */
 329                 pci_read_config_byte(sl82c105, PCI_CLASS_PROG, &progif);
 330                 pci_write_config_byte(sl82c105, PCI_CLASS_PROG, progif | 0x05);
 331                 sl82c105->class |= 0x05;
 332                 /* Disable SL82C105 second port */
 333                 pci_write_config_word(sl82c105, SL82C105_IDECSR, 0x0003);
 334         }
 335 }
 336 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 337                 chrp_pci_fixup_winbond_ata);