drivers/sbus/sbus.c

   1 /* sbus.c: SBus support routines.
   2  *
   3  * Copyright (C) 1995, 2006 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/slab.h>
   8 #include <linux/init.h>
   9 #include <linux/device.h>
  10
  11 #include <asm/system.h>
  12 #include <asm/sbus.h>
  13 #include <asm/dma.h>
  14 #include <asm/oplib.h>
  15 #include <asm/prom.h>
  16 #include <asm/of_device.h>
  17 #include <asm/bpp.h>
  18 #include <asm/irq.h>
  19
  20 static ssize_t
  21 show_sbusobppath_attr(struct device * dev, struct device_attribute * attr, char * buf)
  22 {
  23         struct sbus_dev *sbus;
  24
  25         sbus = to_sbus_device(dev);
  26
  27         return snprintf (buf, PAGE_SIZE, "%s\n", sbus->ofdev.node->full_name);
  28 }
  29
  30 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, show_sbusobppath_attr, NULL);
  31
  32 struct sbus_bus *sbus_root;
  33
  34 static void __init fill_sbus_device(struct device_node *dp, struct sbus_dev *sdev)
  35 {
  36         unsigned long base;
  37         const void *pval;
  38         int len, err;
  39
  40         sdev->prom_node = dp->node;
  41         strcpy(sdev->prom_name, dp->name);
  42
  43         pval = of_get_property(dp, "reg", &len);
  44         sdev->num_registers = 0;
  45         if (pval) {
  46                 memcpy(sdev->reg_addrs, pval, len);
  47
  48                 sdev->num_registers =
  49                         len / sizeof(struct linux_prom_registers);
  50
  51                 base = (unsigned long) sdev->reg_addrs[0].phys_addr;
  52
  53                 /* Compute the slot number. */
  54                 if (base >= SUN_SBUS_BVADDR && sparc_cpu_model == sun4m)
  55                         sdev->slot = sbus_dev_slot(base);
  56                 else
  57                         sdev->slot = sdev->reg_addrs[0].which_io;
  58         }
  59
  60         pval = of_get_property(dp, "ranges", &len);
  61         sdev->num_device_ranges = 0;
  62         if (pval) {
  63                 memcpy(sdev->device_ranges, pval, len);
  64                 sdev->num_device_ranges =
  65                         len / sizeof(struct linux_prom_ranges);
  66         }
  67
  68         sbus_fill_device_irq(sdev);
  69
  70         sdev->ofdev.node = dp;
  71         if (sdev->parent)
  72                 sdev->ofdev.dev.parent = &sdev->parent->ofdev.dev;
  73         else
  74                 sdev->ofdev.dev.parent = &sdev->bus->ofdev.dev;
  75         sdev->ofdev.dev.bus = &sbus_bus_type;
  76         sprintf(sdev->ofdev.dev.bus_id, "sbus[%08x]", dp->node);
  77
  78         if (of_device_register(&sdev->ofdev) != 0)
  79                 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
  80                        dp->path_component_name);
  81
  82         /* WE HAVE BEEN INVADED BY ALIENS! */
  83         err = sysfs_create_file(&sdev->ofdev.dev.kobj, &dev_attr_obppath.attr);
  84 }
  85
  86 static void __init sbus_bus_ranges_init(struct device_node *dp, struct sbus_bus *sbus)
  87 {
  88         const void *pval;
  89         int len;
  90
  91         pval = of_get_property(dp, "ranges", &len);
  92         sbus->num_sbus_ranges = 0;
  93         if (pval) {
  94                 memcpy(sbus->sbus_ranges, pval, len);
  95                 sbus->num_sbus_ranges =
  96                         len / sizeof(struct linux_prom_ranges);
  97
  98                 sbus_arch_bus_ranges_init(dp->parent, sbus);
  99         }
 100 }
 101
 102 static void __init __apply_ranges_to_regs(struct linux_prom_ranges *ranges,
 103                                           int num_ranges,
 104                                           struct linux_prom_registers *regs,
 105                                           int num_regs)
 106 {
 107         if (num_ranges) {
 108                 int regnum;
 109
 110                 for (regnum = 0; regnum < num_regs; regnum++) {
 111                         int rngnum;
 112
 113                         for (rngnum = 0; rngnum < num_ranges; rngnum++) {
 114                                 if (regs[regnum].which_io == ranges[rngnum].ot_child_space)
 115                                         break;
 116                         }
 117                         if (rngnum == num_ranges) {
 118                                 /* We used to flag this as an error.  Actually
 119                                  * some devices do not report the regs as we expect.
 120                                  * For example, see SUNW,pln device.  In that case
 121                                  * the reg property is in a format internal to that
 122                                  * node, ie. it is not in the SBUS register space
 123                                  * per se. -DaveM
 124                                  */
 125                                 return;
 126                         }
 127                         regs[regnum].which_io = ranges[rngnum].ot_parent_space;
 128                         regs[regnum].phys_addr -= ranges[rngnum].ot_child_base;
 129                         regs[regnum].phys_addr += ranges[rngnum].ot_parent_base;
 130                 }
 131         }
 132 }
 133
 134 static void __init __fixup_regs_sdev(struct sbus_dev *sdev)
 135 {
 136         if (sdev->num_registers != 0) {
 137                 struct sbus_dev *parent = sdev->parent;
 138                 int i;
 139
 140                 while (parent != NULL) {
 141                         __apply_ranges_to_regs(parent->device_ranges,
 142                                                parent->num_device_ranges,
 143                                                sdev->reg_addrs,
 144                                                sdev->num_registers);
 145
 146                         parent = parent->parent;
 147                 }
 148
 149                 __apply_ranges_to_regs(sdev->bus->sbus_ranges,
 150                                        sdev->bus->num_sbus_ranges,
 151                                        sdev->reg_addrs,
 152                                        sdev->num_registers);
 153
 154                 for (i = 0; i < sdev->num_registers; i++) {
 155                         struct resource *res = &sdev->resource[i];
 156
 157                         res->start = sdev->reg_addrs[i].phys_addr;
 158                         res->end = (res->start +
 159                                     (unsigned long)sdev->reg_addrs[i].reg_size - 1UL);
 160                         res->flags = IORESOURCE_IO |
 161                                 (sdev->reg_addrs[i].which_io & 0xff);
 162                 }
 163         }
 164 }
 165
 166 static void __init sbus_fixup_all_regs(struct sbus_dev *first_sdev)
 167 {
 168         struct sbus_dev *sdev;
 169
 170         for (sdev = first_sdev; sdev; sdev = sdev->next) {
 171                 if (sdev->child)
 172                         sbus_fixup_all_regs(sdev->child);
 173                 __fixup_regs_sdev(sdev);
 174         }
 175 }
 176
 177 /* We preserve the "probe order" of these bus and device lists to give
 178  * the same ordering as the old code.
 179  */
 180 static void __init sbus_insert(struct sbus_bus *sbus, struct sbus_bus **root)
 181 {
 182         while (*root)
 183                 root = &(*root)->next;
 184         *root = sbus;
 185         sbus->next = NULL;
 186 }
 187
 188 static void __init sdev_insert(struct sbus_dev *sdev, struct sbus_dev **root)
 189 {
 190         while (*root)
 191                 root = &(*root)->next;
 192         *root = sdev;
 193         sdev->next = NULL;
 194 }
 195
 196 static void __init walk_children(struct device_node *dp, struct sbus_dev *parent, struct sbus_bus *sbus)
 197 {
 198         dp = dp->child;
 199         while (dp) {
 200                 struct sbus_dev *sdev;
 201
 202                 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
 203                 if (sdev) {
 204                         sdev_insert(sdev, &parent->child);
 205
 206                         sdev->bus = sbus;
 207                         sdev->parent = parent;
 208
 209                         fill_sbus_device(dp, sdev);
 210
 211                         walk_children(dp, sdev, sbus);
 212                 }
 213                 dp = dp->sibling;
 214         }
 215 }
 216
 217 static void __init build_one_sbus(struct device_node *dp, int num_sbus)
 218 {
 219         struct sbus_bus *sbus;
 220         unsigned int sbus_clock;
 221         struct device_node *dev_dp;
 222
 223         sbus = kzalloc(sizeof(struct sbus_bus), GFP_ATOMIC);
 224         if (!sbus)
 225                 return;
 226
 227         sbus_insert(sbus, &sbus_root);
 228         sbus->prom_node = dp->node;
 229
 230         sbus_setup_iommu(sbus, dp);
 231
 232         printk("sbus%d: ", num_sbus);
 233
 234         sbus_clock = of_getintprop_default(dp, "clock-frequency",
 235                                            (25*1000*1000));
 236         sbus->clock_freq = sbus_clock;
 237
 238         printk("Clock %d.%d MHz\n", (int) ((sbus_clock/1000)/1000),
 239                (int) (((sbus_clock/1000)%1000 != 0) ?
 240                       (((sbus_clock/1000)%1000) + 1000) : 0));
 241
 242         strcpy(sbus->prom_name, dp->name);
 243
 244         sbus_setup_arch_props(sbus, dp);
 245
 246         sbus_bus_ranges_init(dp, sbus);
 247
 248         sbus->ofdev.node = dp;
 249         sbus->ofdev.dev.parent = NULL;
 250         sbus->ofdev.dev.bus = &sbus_bus_type;
 251         sprintf(sbus->ofdev.dev.bus_id, "sbus%d", num_sbus);
 252
 253         if (of_device_register(&sbus->ofdev) != 0)
 254                 printk(KERN_DEBUG "sbus: device registration error for %s!\n",
 255                        sbus->ofdev.dev.bus_id);
 256
 257         dev_dp = dp->child;
 258         while (dev_dp) {
 259                 struct sbus_dev *sdev;
 260
 261                 sdev = kzalloc(sizeof(struct sbus_dev), GFP_ATOMIC);
 262                 if (sdev) {
 263                         sdev_insert(sdev, &sbus->devices);
 264
 265                         sdev->bus = sbus;
 266                         sdev->parent = NULL;
 267                         fill_sbus_device(dev_dp, sdev);
 268
 269                         walk_children(dev_dp, sdev, sbus);
 270                 }
 271                 dev_dp = dev_dp->sibling;
 272         }
 273
 274         sbus_fixup_all_regs(sbus->devices);
 275
 276         dvma_init(sbus);
 277 }
 278
 279 static int __init sbus_init(void)
 280 {
 281         struct device_node *dp;
 282         const char *sbus_name = "sbus";
 283         int num_sbus = 0;
 284
 285         if (sbus_arch_preinit())
 286                 return 0;
 287
 288         if (sparc_cpu_model == sun4d)
 289                 sbus_name = "sbi";
 290
 291         for_each_node_by_name(dp, sbus_name) {
 292                 build_one_sbus(dp, num_sbus);
 293                 num_sbus++;
 294
 295         }
 296
 297         sbus_arch_postinit();
 298
 299         return 0;
 300 }
 301
 302 subsys_initcall(sbus_init);