git.oblomov.eu Git - linux-2.6/blob - 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/gg2.h>
  17 #include <asm/machdep.h>
  18 #include <asm/sections.h>
  19 #include <asm/pci-bridge.h>
  20 #include <asm/grackle.h>
  21 #include <asm/rtas.h>
  22
  23 #include "chrp.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         gg2_read_config,
  90         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->index << 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->index << 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         rtas_read_config,
 128         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 = find_devices("mac-io");
 140         if (np == NULL || of_address_to_resource(np, 0, &r))
 141                 return 0;
 142         Hydra = ioremap(r.start, r.end-r.start);
 143         printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
 144         printk("Hydra Feature_Control was %x",
 145                in_le32(&Hydra->Feature_Control));
 146         out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
 147                                            HYDRA_FC_SCSI_CELL_EN |
 148                                            HYDRA_FC_SCCA_ENABLE |
 149                                            HYDRA_FC_SCCB_ENABLE |
 150                                            HYDRA_FC_ARB_BYPASS |
 151                                            HYDRA_FC_MPIC_ENABLE |
 152                                            HYDRA_FC_SLOW_SCC_PCLK |
 153                                            HYDRA_FC_MPIC_IS_MASTER));
 154         printk(", now %x\n", in_le32(&Hydra->Feature_Control));
 155         return 1;
 156 }
 157
 158 #define PRG_CL_RESET_VALID 0x00010000
 159
 160 static void __init
 161 setup_python(struct pci_controller *hose, struct device_node *dev)
 162 {
 163         u32 __iomem *reg;
 164         u32 val;
 165         struct resource r;
 166
 167         if (of_address_to_resource(dev, 0, &r)) {
 168                 printk(KERN_ERR "No address for Python PCI controller\n");
 169                 return;
 170         }
 171
 172         /* Clear the magic go-slow bit */
 173         reg = ioremap(r.start + 0xf6000, 0x40);
 174         BUG_ON(!reg);
 175         val = in_be32(&reg[12]);
 176         if (val & PRG_CL_RESET_VALID) {
 177                 out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
 178                 in_be32(&reg[12]);
 179         }
 180         iounmap(reg);
 181
 182         setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010);
 183 }
 184
 185 /* Marvell Discovery II based Pegasos 2 */
 186 static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
 187 {
 188         struct device_node *root = find_path_device("/");
 189         struct device_node *rtas;
 190
 191         of_node_get(root);
 192         rtas = of_find_node_by_name (root, "rtas");
 193         if (rtas) {
 194                 hose->ops = &rtas_pci_ops;
 195                 of_node_put(rtas);
 196         } else {
 197                 printk ("RTAS supporting Pegasos OF not found, please upgrade"
 198                         " your firmware\n");
 199         }
 200         pci_assign_all_buses = 1;
 201 }
 202
 203 void __init
 204 chrp_find_bridges(void)
 205 {
 206         struct device_node *dev;
 207         const int *bus_range;
 208         int len, index = -1;
 209         struct pci_controller *hose;
 210         const unsigned int *dma;
 211         const char *model, *machine;
 212         int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
 213         struct device_node *root = find_path_device("/");
 214         struct resource r;
 215         /*
 216          * The PCI host bridge nodes on some machines don't have
 217          * properties to adequately identify them, so we have to
 218          * look at what sort of machine this is as well.
 219          */
 220         machine = get_property(root, "model", NULL);
 221         if (machine != NULL) {
 222                 is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
 223                 is_mot = strncmp(machine, "MOT", 3) == 0;
 224                 if (strncmp(machine, "Pegasos2", 8) == 0)
 225                         is_pegasos = 2;
 226                 else if (strncmp(machine, "Pegasos", 7) == 0)
 227                         is_pegasos = 1;
 228         }
 229         for (dev = root->child; dev != NULL; dev = dev->sibling) {
 230                 if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
 231                         continue;
 232                 ++index;
 233                 /* The GG2 bridge on the LongTrail doesn't have an address */
 234                 if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
 235                         printk(KERN_WARNING "Can't use %s: no address\n",
 236                                dev->full_name);
 237                         continue;
 238                 }
 239                 bus_range = get_property(dev, "bus-range", &len);
 240                 if (bus_range == NULL || len < 2 * sizeof(int)) {
 241                         printk(KERN_WARNING "Can't get bus-range for %s\n",
 242                                 dev->full_name);
 243                         continue;
 244                 }
 245                 if (bus_range[1] == bus_range[0])
 246                         printk(KERN_INFO "PCI bus %d", bus_range[0]);
 247                 else
 248                         printk(KERN_INFO "PCI buses %d..%d",
 249                                bus_range[0], bus_range[1]);
 250                 printk(" controlled by %s", dev->full_name);
 251                 if (!is_longtrail)
 252                         printk(" at %llx", (unsigned long long)r.start);
 253                 printk("\n");
 254
 255                 hose = pcibios_alloc_controller();
 256                 if (!hose) {
 257                         printk("Can't allocate PCI controller structure for %s\n",
 258                                 dev->full_name);
 259                         continue;
 260                 }
 261                 hose->arch_data = dev;
 262                 hose->first_busno = bus_range[0];
 263                 hose->last_busno = bus_range[1];
 264
 265                 model = get_property(dev, "model", NULL);
 266                 if (model == NULL)
 267                         model = "<none>";
 268                 if (device_is_compatible(dev, "IBM,python")) {
 269                         setup_python(hose, dev);
 270                 } else if (is_mot
 271                            || strncmp(model, "Motorola, Grackle", 17) == 0) {
 272                         setup_grackle(hose);
 273                 } else if (is_longtrail) {
 274                         void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
 275                         hose->ops = &gg2_pci_ops;
 276                         hose->cfg_data = p;
 277                         gg2_pci_config_base = p;
 278                 } else if (is_pegasos == 1) {
 279                         setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc);
 280                 } else if (is_pegasos == 2) {
 281                         setup_peg2(hose, dev);
 282                 } else if (!strncmp(model, "IBM,CPC710", 10)) {
 283                         setup_indirect_pci(hose,
 284                                            r.start + 0x000f8000,
 285                                            r.start + 0x000f8010);
 286                         if (index == 0) {
 287                                 dma = get_property(dev, "system-dma-base",&len);
 288                                 if (dma && len >= sizeof(*dma)) {
 289                                         dma = (unsigned int *)
 290                                                 (((unsigned long)dma) +
 291                                                 len - sizeof(*dma));
 292                                                 pci_dram_offset = *dma;
 293                                 }
 294                         }
 295                 } else {
 296                         printk("No methods for %s (model %s), using RTAS\n",
 297                                dev->full_name, model);
 298                         hose->ops = &rtas_pci_ops;
 299                 }
 300
 301                 pci_process_bridge_OF_ranges(hose, dev, index == 0);
 302
 303                 /* check the first bridge for a property that we can
 304                    use to set pci_dram_offset */
 305                 dma = get_property(dev, "ibm,dma-ranges", &len);
 306                 if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
 307                         pci_dram_offset = dma[2] - dma[3];
 308                         printk("pci_dram_offset = %lx\n", pci_dram_offset);
 309                 }
 310         }
 311 }
 312
 313 /* SL82C105 IDE Control/Status Register */
 314 #define SL82C105_IDECSR                0x40
 315
 316 /* Fixup for Winbond ATA quirk, required for briq */
 317 void chrp_pci_fixup_winbond_ata(struct pci_dev *sl82c105)
 318 {
 319         u8 progif;
 320
 321         /* If non-briq machines need that fixup too, please speak up */
 322         if (!machine_is(chrp) || _chrp_type != _CHRP_briq)
 323                 return;
 324
 325         if ((sl82c105->class & 5) != 5) {
 326                 printk("W83C553: Switching SL82C105 IDE to PCI native mode\n");
 327                 /* Enable SL82C105 PCI native IDE mode */
 328                 pci_read_config_byte(sl82c105, PCI_CLASS_PROG, &progif);
 329                 pci_write_config_byte(sl82c105, PCI_CLASS_PROG, progif | 0x05);
 330                 sl82c105->class |= 0x05;
 331                 /* Disable SL82C105 second port */
 332                 pci_write_config_word(sl82c105, SL82C105_IDECSR, 0x0003);
 333         }
 334 }
 335 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
 336                 chrp_pci_fixup_winbond_ata);