arch/sparc64/kernel/devices.c

   1 /* devices.c: Initial scan of the prom device tree for important
   2  *            Sparc device nodes which we need to find.
   3  *
   4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #include <linux/config.h>
   8 #include <linux/kernel.h>
   9 #include <linux/threads.h>
  10 #include <linux/init.h>
  11 #include <linux/ioport.h>
  12 #include <linux/string.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/errno.h>
  15 #include <linux/bootmem.h>
  16
  17 #include <asm/page.h>
  18 #include <asm/oplib.h>
  19 #include <asm/system.h>
  20 #include <asm/smp.h>
  21 #include <asm/spitfire.h>
  22 #include <asm/timer.h>
  23 #include <asm/cpudata.h>
  24 #include <asm/vdev.h>
  25 #include <asm/irq.h>
  26
  27 /* Used to synchronize acceses to NatSemi SUPER I/O chip configure
  28  * operations in asm/ns87303.h
  29  */
  30 DEFINE_SPINLOCK(ns87303_lock);
  31
  32 extern void cpu_probe(void);
  33 extern void central_probe(void);
  34
  35 u32 sun4v_vdev_devhandle;
  36 struct device_node *sun4v_vdev_root;
  37
  38 struct vdev_intmap {
  39         unsigned int phys;
  40         unsigned int irq;
  41         unsigned int cnode;
  42         unsigned int cinterrupt;
  43 };
  44
  45 struct vdev_intmask {
  46         unsigned int phys;
  47         unsigned int interrupt;
  48         unsigned int __unused;
  49 };
  50
  51 static struct vdev_intmap *vdev_intmap;
  52 static int vdev_num_intmap;
  53 static struct vdev_intmask *vdev_intmask;
  54
  55 static void __init sun4v_virtual_device_probe(void)
  56 {
  57         struct linux_prom64_registers *regs;
  58         struct property *prop;
  59         struct device_node *dp;
  60         int sz;
  61
  62         if (tlb_type != hypervisor)
  63                 return;
  64
  65         dp = of_find_node_by_name(NULL, "virtual-devices");
  66         if (!dp) {
  67                 prom_printf("SUN4V: Fatal error, no virtual-devices node.\n");
  68                 prom_halt();
  69         }
  70
  71         sun4v_vdev_root = dp;
  72
  73         prop = of_find_property(dp, "reg", NULL);
  74         regs = prop->value;
  75         sun4v_vdev_devhandle = (regs[0].phys_addr >> 32UL) & 0x0fffffff;
  76
  77         prop = of_find_property(dp, "interrupt-map", &sz);
  78         vdev_intmap = prop->value;
  79         vdev_num_intmap = sz / sizeof(struct vdev_intmap);
  80
  81         prop = of_find_property(dp, "interrupt-map-mask", NULL);
  82         vdev_intmask = prop->value;
  83
  84         printk("%s: Virtual Device Bus devhandle[%x]\n",
  85                dp->full_name, sun4v_vdev_devhandle);
  86 }
  87
  88 unsigned int sun4v_vdev_device_interrupt(struct device_node *dev_node)
  89 {
  90         struct property *prop;
  91         unsigned int irq, reg;
  92         int i;
  93
  94         prop = of_find_property(dev_node, "interrupts", NULL);
  95         if (!prop) {
  96                 printk("VDEV: Cannot get \"interrupts\" "
  97                        "property for OBP node %s\n",
  98                        dev_node->full_name);
  99                 return 0;
 100         }
 101         irq = *(unsigned int *) prop->value;
 102
 103         prop = of_find_property(dev_node, "reg", NULL);
 104         if (!prop) {
 105                 printk("VDEV: Cannot get \"reg\" "
 106                        "property for OBP node %s\n",
 107                        dev_node->full_name);
 108                 return 0;
 109         }
 110         reg = *(unsigned int *) prop->value;
 111
 112         for (i = 0; i < vdev_num_intmap; i++) {
 113                 if (vdev_intmap[i].phys == (reg & vdev_intmask->phys) &&
 114                     vdev_intmap[i].irq == (irq & vdev_intmask->interrupt)) {
 115                         irq = vdev_intmap[i].cinterrupt;
 116                         break;
 117                 }
 118         }
 119
 120         if (i == vdev_num_intmap) {
 121                 printk("VDEV: No matching interrupt map entry "
 122                        "for OBP node %s\n", dev_node->full_name);
 123                 return 0;
 124         }
 125
 126         return sun4v_build_irq(sun4v_vdev_devhandle, irq);
 127 }
 128
 129 static const char *cpu_mid_prop(void)
 130 {
 131         if (tlb_type == spitfire)
 132                 return "upa-portid";
 133         return "portid";
 134 }
 135
 136 static int get_cpu_mid(struct device_node *dp)
 137 {
 138         struct property *prop;
 139
 140         if (tlb_type == hypervisor) {
 141                 struct linux_prom64_registers *reg;
 142                 int len;
 143
 144                 prop = of_find_property(dp, "cpuid", &len);
 145                 if (prop && len == 4)
 146                         return *(int *) prop->value;
 147
 148                 prop = of_find_property(dp, "reg", NULL);
 149                 reg = prop->value;
 150                 return (reg[0].phys_addr >> 32) & 0x0fffffffUL;
 151         } else {
 152                 const char *prop_name = cpu_mid_prop();
 153
 154                 prop = of_find_property(dp, prop_name, NULL);
 155                 if (prop)
 156                         return *(int *) prop->value;
 157                 return 0;
 158         }
 159 }
 160
 161 static int check_cpu_node(struct device_node *dp, int *cur_inst,
 162                           int (*compare)(struct device_node *, int, void *),
 163                           void *compare_arg,
 164                           struct device_node **dev_node, int *mid)
 165 {
 166         if (strcmp(dp->type, "cpu"))
 167                 return -ENODEV;
 168
 169         if (!compare(dp, *cur_inst, compare_arg)) {
 170                 if (dev_node)
 171                         *dev_node = dp;
 172                 if (mid)
 173                         *mid = get_cpu_mid(dp);
 174                 return 0;
 175         }
 176
 177         (*cur_inst)++;
 178
 179         return -ENODEV;
 180 }
 181
 182 static int __cpu_find_by(int (*compare)(struct device_node *, int, void *),
 183                          void *compare_arg,
 184                          struct device_node **dev_node, int *mid)
 185 {
 186         struct device_node *dp;
 187         int cur_inst;
 188
 189         cur_inst = 0;
 190         for_each_node_by_type(dp, "cpu") {
 191                 int err = check_cpu_node(dp, &cur_inst,
 192                                          compare, compare_arg,
 193                                          dev_node, mid);
 194                 if (err == 0)
 195                         return 0;
 196         }
 197
 198         return -ENODEV;
 199 }
 200
 201 static int cpu_instance_compare(struct device_node *dp, int instance, void *_arg)
 202 {
 203         int desired_instance = (int) (long) _arg;
 204
 205         if (instance == desired_instance)
 206                 return 0;
 207         return -ENODEV;
 208 }
 209
 210 int cpu_find_by_instance(int instance, struct device_node **dev_node, int *mid)
 211 {
 212         return __cpu_find_by(cpu_instance_compare, (void *)(long)instance,
 213                              dev_node, mid);
 214 }
 215
 216 static int cpu_mid_compare(struct device_node *dp, int instance, void *_arg)
 217 {
 218         int desired_mid = (int) (long) _arg;
 219         int this_mid;
 220
 221         this_mid = get_cpu_mid(dp);
 222         if (this_mid == desired_mid)
 223                 return 0;
 224         return -ENODEV;
 225 }
 226
 227 int cpu_find_by_mid(int mid, struct device_node **dev_node)
 228 {
 229         return __cpu_find_by(cpu_mid_compare, (void *)(long)mid,
 230                              dev_node, NULL);
 231 }
 232
 233 void __init device_scan(void)
 234 {
 235         /* FIX ME FAST... -DaveM */
 236         ioport_resource.end = 0xffffffffffffffffUL;
 237
 238         prom_printf("Booting Linux...\n");
 239
 240 #ifndef CONFIG_SMP
 241         {
 242                 struct device_node *dp;
 243                 int err, def;
 244
 245                 err = cpu_find_by_instance(0, &dp, NULL);
 246                 if (err) {
 247                         prom_printf("No cpu nodes, cannot continue\n");
 248                         prom_halt();
 249                 }
 250                 cpu_data(0).clock_tick =
 251                         of_getintprop_default(dp, "clock-frequency", 0);
 252
 253                 def = ((tlb_type == hypervisor) ?
 254                        (8 * 1024) :
 255                        (16 * 1024));
 256                 cpu_data(0).dcache_size = of_getintprop_default(dp,
 257                                                                 "dcache-size",
 258                                                                 def);
 259
 260                 def = 32;
 261                 cpu_data(0).dcache_line_size =
 262                         of_getintprop_default(dp, "dcache-line-size", def);
 263
 264                 def = 16 * 1024;
 265                 cpu_data(0).icache_size = of_getintprop_default(dp,
 266                                                                 "icache-size",
 267                                                                 def);
 268
 269                 def = 32;
 270                 cpu_data(0).icache_line_size =
 271                         of_getintprop_default(dp, "icache-line-size", def);
 272
 273                 def = ((tlb_type == hypervisor) ?
 274                        (3 * 1024 * 1024) :
 275                        (4 * 1024 * 1024));
 276                 cpu_data(0).ecache_size = of_getintprop_default(dp,
 277                                                                 "ecache-size",
 278                                                                 def);
 279
 280                 def = 64;
 281                 cpu_data(0).ecache_line_size =
 282                         of_getintprop_default(dp, "ecache-line-size", def);
 283                 printk("CPU[0]: Caches "
 284                        "D[sz(%d):line_sz(%d)] "
 285                        "I[sz(%d):line_sz(%d)] "
 286                        "E[sz(%d):line_sz(%d)]\n",
 287                        cpu_data(0).dcache_size, cpu_data(0).dcache_line_size,
 288                        cpu_data(0).icache_size, cpu_data(0).icache_line_size,
 289                        cpu_data(0).ecache_size, cpu_data(0).ecache_line_size);
 290         }
 291 #endif
 292
 293         sun4v_virtual_device_probe();
 294         central_probe();
 295
 296         cpu_probe();
 297 }