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