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