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 int 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 vdev_intmap *ip;
  59         int node, sz, err;
  60
  61         if (tlb_type != hypervisor)
  62                 return;
  63
  64         node = prom_getchild(prom_root_node);
  65         node = prom_searchsiblings(node, "virtual-devices");
  66         if (!node) {
  67                 prom_printf("SUN4V: Fatal error, no virtual-devices node.\n");
  68                 prom_halt();
  69         }
  70
  71         sun4v_vdev_root = node;
  72
  73         prom_getproperty(node, "reg", (char *)&regs, sizeof(regs));
  74         sun4v_vdev_devhandle = (regs.phys_addr >> 32UL) & 0x0fffffff;
  75
  76         sz = prom_getproplen(node, "interrupt-map");
  77         if (sz <= 0) {
  78                 prom_printf("SUN4V: Error, no vdev interrupt-map.\n");
  79                 prom_halt();
  80         }
  81
  82         if ((sz % sizeof(*ip)) != 0) {
  83                 prom_printf("SUN4V: Bogus interrupt-map property size %d\n",
  84                             sz);
  85                 prom_halt();
  86         }
  87
  88         vdev_intmap = ip = alloc_bootmem_low_pages(sz);
  89         if (!vdev_intmap) {
  90                 prom_printf("SUN4V: Error, cannot allocate vdev_intmap.\n");
  91                 prom_halt();
  92         }
  93
  94         err = prom_getproperty(node, "interrupt-map", (char *) ip, sz);
  95         if (err == -1) {
  96                 prom_printf("SUN4V: Fatal error, no vdev interrupt-map.\n");
  97                 prom_halt();
  98         }
  99         if (err != sz) {
 100                 prom_printf("SUN4V: Inconsistent interrupt-map size, "
 101                             "proplen(%d) vs getprop(%d).\n", sz,err);
 102                 prom_halt();
 103         }
 104
 105         vdev_num_intmap = err / sizeof(*ip);
 106
 107         err = prom_getproperty(node, "interrupt-map-mask",
 108                                (char *) &vdev_intmask,
 109                                sizeof(vdev_intmask));
 110         if (err <= 0) {
 111                 prom_printf("SUN4V: Fatal error, no vdev "
 112                             "interrupt-map-mask.\n");
 113                 prom_halt();
 114         }
 115         if (err % sizeof(vdev_intmask)) {
 116                 prom_printf("SUN4V: Bogus interrupt-map-mask "
 117                             "property size %d\n", err);
 118                 prom_halt();
 119         }
 120
 121         printk("SUN4V: virtual-devices devhandle[%x]\n",
 122                sun4v_vdev_devhandle);
 123 }
 124
 125 unsigned int sun4v_vdev_device_interrupt(unsigned int dev_node)
 126 {
 127         unsigned int irq, reg;
 128         int err, i;
 129
 130         err = prom_getproperty(dev_node, "interrupts",
 131                                (char *) &irq, sizeof(irq));
 132         if (err <= 0) {
 133                 printk("VDEV: Cannot get \"interrupts\" "
 134                        "property for OBP node %x\n", dev_node);
 135                 return 0;
 136         }
 137
 138         err = prom_getproperty(dev_node, "reg",
 139                                (char *) &reg, sizeof(reg));
 140         if (err <= 0) {
 141                 printk("VDEV: Cannot get \"reg\" "
 142                        "property for OBP node %x\n", dev_node);
 143                 return 0;
 144         }
 145
 146         for (i = 0; i < vdev_num_intmap; i++) {
 147                 if (vdev_intmap[i].phys == (reg & vdev_intmask.phys) &&
 148                     vdev_intmap[i].irq == (irq & vdev_intmask.interrupt)) {
 149                         irq = vdev_intmap[i].cinterrupt;
 150                         break;
 151                 }
 152         }
 153
 154         if (i == vdev_num_intmap) {
 155                 printk("VDEV: No matching interrupt map entry "
 156                        "for OBP node %x\n", dev_node);
 157                 return 0;
 158         }
 159
 160         return sun4v_build_irq(sun4v_vdev_devhandle, irq, 5, 0);
 161 }
 162
 163 static const char *cpu_mid_prop(void)
 164 {
 165         if (tlb_type == spitfire)
 166                 return "upa-portid";
 167         return "portid";
 168 }
 169
 170 static int get_cpu_mid(int prom_node)
 171 {
 172         if (tlb_type == hypervisor) {
 173                 struct linux_prom64_registers reg;
 174
 175                 if (prom_getproplen(prom_node, "cpuid") == 4)
 176                         return prom_getintdefault(prom_node, "cpuid", 0);
 177
 178                 prom_getproperty(prom_node, "reg", (char *) &reg, sizeof(reg));
 179                 return (reg.phys_addr >> 32) & 0x0fffffffUL;
 180         } else {
 181                 const char *prop_name = cpu_mid_prop();
 182
 183                 return prom_getintdefault(prom_node, prop_name, 0);
 184         }
 185 }
 186
 187 static int check_cpu_node(int nd, int *cur_inst,
 188                           int (*compare)(int, int, void *), void *compare_arg,
 189                           int *prom_node, int *mid)
 190 {
 191         char node_str[128];
 192
 193         prom_getstring(nd, "device_type", node_str, sizeof(node_str));
 194         if (strcmp(node_str, "cpu"))
 195                 return -ENODEV;
 196
 197         if (!compare(nd, *cur_inst, compare_arg)) {
 198                 if (prom_node)
 199                         *prom_node = nd;
 200                 if (mid)
 201                         *mid = get_cpu_mid(nd);
 202                 return 0;
 203         }
 204
 205         (*cur_inst)++;
 206
 207         return -ENODEV;
 208 }
 209
 210 static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg,
 211                          int *prom_node, int *mid)
 212 {
 213         int nd, cur_inst, err;
 214
 215         nd = prom_root_node;
 216         cur_inst = 0;
 217
 218         err = check_cpu_node(nd, &cur_inst,
 219                              compare, compare_arg,
 220                              prom_node, mid);
 221         if (err == 0)
 222                 return 0;
 223
 224         nd = prom_getchild(nd);
 225         while ((nd = prom_getsibling(nd)) != 0) {
 226                 err = check_cpu_node(nd, &cur_inst,
 227                                      compare, compare_arg,
 228                                      prom_node, mid);
 229                 if (err == 0)
 230                         return 0;
 231         }
 232
 233         return -ENODEV;
 234 }
 235
 236 static int cpu_instance_compare(int nd, int instance, void *_arg)
 237 {
 238         int desired_instance = (int) (long) _arg;
 239
 240         if (instance == desired_instance)
 241                 return 0;
 242         return -ENODEV;
 243 }
 244
 245 int cpu_find_by_instance(int instance, int *prom_node, int *mid)
 246 {
 247         return __cpu_find_by(cpu_instance_compare, (void *)(long)instance,
 248                              prom_node, mid);
 249 }
 250
 251 static int cpu_mid_compare(int nd, int instance, void *_arg)
 252 {
 253         int desired_mid = (int) (long) _arg;
 254         int this_mid;
 255
 256         this_mid = get_cpu_mid(nd);
 257         if (this_mid == desired_mid)
 258                 return 0;
 259         return -ENODEV;
 260 }
 261
 262 int cpu_find_by_mid(int mid, int *prom_node)
 263 {
 264         return __cpu_find_by(cpu_mid_compare, (void *)(long)mid,
 265                              prom_node, NULL);
 266 }
 267
 268 void __init device_scan(void)
 269 {
 270         /* FIX ME FAST... -DaveM */
 271         ioport_resource.end = 0xffffffffffffffffUL;
 272
 273         prom_printf("Booting Linux...\n");
 274
 275 #ifndef CONFIG_SMP
 276         {
 277                 int err, cpu_node, def;
 278
 279                 err = cpu_find_by_instance(0, &cpu_node, NULL);
 280                 if (err) {
 281                         prom_printf("No cpu nodes, cannot continue\n");
 282                         prom_halt();
 283                 }
 284                 cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
 285                                                             "clock-frequency",
 286                                                             0);
 287
 288                 def = ((tlb_type == hypervisor) ?
 289                        (8 * 1024) :
 290                        (16 * 1024));
 291                 cpu_data(0).dcache_size = prom_getintdefault(cpu_node,
 292                                                              "dcache-size",
 293                                                              def);
 294
 295                 def = 32;
 296                 cpu_data(0).dcache_line_size =
 297                         prom_getintdefault(cpu_node, "dcache-line-size",
 298                                            def);
 299
 300                 def = 16 * 1024;
 301                 cpu_data(0).icache_size = prom_getintdefault(cpu_node,
 302                                                              "icache-size",
 303                                                              def);
 304
 305                 def = 32;
 306                 cpu_data(0).icache_line_size =
 307                         prom_getintdefault(cpu_node, "icache-line-size",
 308                                            def);
 309
 310                 def = ((tlb_type == hypervisor) ?
 311                        (3 * 1024 * 1024) :
 312                        (4 * 1024 * 1024));
 313                 cpu_data(0).ecache_size = prom_getintdefault(cpu_node,
 314                                                              "ecache-size",
 315                                                              def);
 316
 317                 def = 64;
 318                 cpu_data(0).ecache_line_size =
 319                         prom_getintdefault(cpu_node, "ecache-line-size",
 320                                            def);
 321                 printk("CPU[0]: Caches "
 322                        "D[sz(%d):line_sz(%d)] "
 323                        "I[sz(%d):line_sz(%d)] "
 324                        "E[sz(%d):line_sz(%d)]\n",
 325                        cpu_data(0).dcache_size, cpu_data(0).dcache_line_size,
 326                        cpu_data(0).icache_size, cpu_data(0).icache_line_size,
 327                        cpu_data(0).ecache_size, cpu_data(0).ecache_line_size);
 328         }
 329 #endif
 330
 331         sun4v_virtual_device_probe();
 332         central_probe();
 333
 334         cpu_probe();
 335 }