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