arch/sparc/kernel/sun4m_irq.c

   1 /*  sun4m_irq.c
   2  *  arch/sparc/kernel/sun4m_irq.c:
   3  *
   4  *  djhr: Hacked out of irq.c into a CPU dependent version.
   5  *
   6  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   7  *  Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
   8  *  Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com)
   9  *  Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/linkage.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/signal.h>
  16 #include <linux/sched.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/smp.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/slab.h>
  21 #include <linux/init.h>
  22 #include <linux/ioport.h>
  23 #include <linux/of.h>
  24 #include <linux/of_device.h>
  25
  26 #include <asm/ptrace.h>
  27 #include <asm/processor.h>
  28 #include <asm/system.h>
  29 #include <asm/psr.h>
  30 #include <asm/vaddrs.h>
  31 #include <asm/timer.h>
  32 #include <asm/openprom.h>
  33 #include <asm/oplib.h>
  34 #include <asm/traps.h>
  35 #include <asm/pgalloc.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/smp.h>
  38 #include <asm/irq.h>
  39 #include <asm/io.h>
  40 #include <asm/cacheflush.h>
  41
  42 #include "irq.h"
  43
  44 struct sun4m_irq_percpu {
  45         u32             pending;
  46         u32             clear;
  47         u32             set;
  48 };
  49
  50 struct sun4m_irq_global {
  51         u32             pending;
  52         u32             mask;
  53         u32             mask_clear;
  54         u32             mask_set;
  55         u32             interrupt_target;
  56 };
  57
  58 /* Code in entry.S needs to get at these register mappings.  */
  59 struct sun4m_irq_percpu __iomem *sun4m_irq_percpu[SUN4M_NCPUS];
  60 struct sun4m_irq_global __iomem *sun4m_irq_global;
  61
  62 /* Dave Redman (djhr@tadpole.co.uk)
  63  * The sun4m interrupt registers.
  64  */
  65 #define SUN4M_INT_ENABLE        0x80000000
  66 #define SUN4M_INT_E14           0x00000080
  67 #define SUN4M_INT_E10           0x00080000
  68
  69 #define SUN4M_HARD_INT(x)       (0x000000001 << (x))
  70 #define SUN4M_SOFT_INT(x)       (0x000010000 << (x))
  71
  72 #define SUN4M_INT_MASKALL       0x80000000        /* mask all interrupts */
  73 #define SUN4M_INT_MODULE_ERR    0x40000000        /* module error */
  74 #define SUN4M_INT_M2S_WRITE_ERR 0x20000000        /* write buffer error */
  75 #define SUN4M_INT_ECC_ERR       0x10000000        /* ecc memory error */
  76 #define SUN4M_INT_VME_ERR       0x08000000        /* vme async error */
  77 #define SUN4M_INT_FLOPPY        0x00400000        /* floppy disk */
  78 #define SUN4M_INT_MODULE        0x00200000        /* module interrupt */
  79 #define SUN4M_INT_VIDEO         0x00100000        /* onboard video */
  80 #define SUN4M_INT_REALTIME      0x00080000        /* system timer */
  81 #define SUN4M_INT_SCSI          0x00040000        /* onboard scsi */
  82 #define SUN4M_INT_AUDIO         0x00020000        /* audio/isdn */
  83 #define SUN4M_INT_ETHERNET      0x00010000        /* onboard ethernet */
  84 #define SUN4M_INT_SERIAL        0x00008000        /* serial ports */
  85 #define SUN4M_INT_KBDMS         0x00004000        /* keyboard/mouse */
  86 #define SUN4M_INT_SBUSBITS      0x00003F80        /* sbus int bits */
  87 #define SUN4M_INT_VMEBITS       0x0000007F        /* vme int bits */
  88
  89 #define SUN4M_INT_ERROR         (SUN4M_INT_MODULE_ERR |    \
  90                                  SUN4M_INT_M2S_WRITE_ERR | \
  91                                  SUN4M_INT_ECC_ERR |       \
  92                                  SUN4M_INT_VME_ERR)
  93
  94 #define SUN4M_INT_SBUS(x)       (1 << (x+7))
  95 #define SUN4M_INT_VME(x)        (1 << (x))
  96
  97 /* Interrupt levels used by OBP */
  98 #define OBP_INT_LEVEL_SOFT      0x10
  99 #define OBP_INT_LEVEL_ONBOARD   0x20
 100 #define OBP_INT_LEVEL_SBUS      0x30
 101 #define OBP_INT_LEVEL_VME       0x40
 102
 103 /* Interrupt level assignment on sun4m:
 104  *
 105  *      level           source
 106  * ------------------------------------------------------------
 107  *        1             softint-1
 108  *        2             softint-2, VME/SBUS level 1
 109  *        3             softint-3, VME/SBUS level 2
 110  *        4             softint-4, onboard SCSI
 111  *        5             softint-5, VME/SBUS level 3
 112  *        6             softint-6, onboard ETHERNET
 113  *        7             softint-7, VME/SBUS level 4
 114  *        8             softint-8, onboard VIDEO
 115  *        9             softint-9, VME/SBUS level 5, Module Interrupt
 116  *       10             softint-10, system counter/timer
 117  *       11             softint-11, VME/SBUS level 6, Floppy
 118  *       12             softint-12, Keyboard/Mouse, Serial
 119  *       13             softint-13, VME/SBUS level 7, ISDN Audio
 120  *       14             softint-14, per-processor counter/timer
 121  *       15             softint-15, Asynchronous Errors (broadcast)
 122  *
 123  * Each interrupt source is masked distinctly in the sun4m interrupt
 124  * registers.  The PIL level alone is therefore ambiguous, since multiple
 125  * interrupt sources map to a single PIL.
 126  *
 127  * This ambiguity is resolved in the 'intr' property for device nodes
 128  * in the OF device tree.  Each 'intr' property entry is composed of
 129  * two 32-bit words.  The first word is the IRQ priority value, which
 130  * is what we're intersted in.  The second word is the IRQ vector, which
 131  * is unused.
 132  *
 133  * The low 4 bits of the IRQ priority indicate the PIL, and the upper
 134  * 4 bits indicate onboard vs. SBUS leveled vs. VME leveled.  0x20
 135  * means onboard, 0x30 means SBUS leveled, and 0x40 means VME leveled.
 136  *
 137  * For example, an 'intr' IRQ priority value of 0x24 is onboard SCSI
 138  * whereas a value of 0x33 is SBUS level 2.  Here are some sample
 139  * 'intr' property IRQ priority values from ss4, ss5, ss10, ss20, and
 140  * Tadpole S3 GX systems.
 141  *
 142  * esp:         0x24    onboard ESP SCSI
 143  * le:          0x26    onboard Lance ETHERNET
 144  * p9100:       0x32    SBUS level 1 P9100 video
 145  * bpp:         0x33    SBUS level 2 BPP parallel port device
 146  * DBRI:        0x39    SBUS level 5 DBRI ISDN audio
 147  * SUNW,leo:    0x39    SBUS level 5 LEO video
 148  * pcmcia:      0x3b    SBUS level 6 PCMCIA controller
 149  * uctrl:       0x3b    SBUS level 6 UCTRL device
 150  * modem:       0x3d    SBUS level 7 MODEM
 151  * zs:          0x2c    onboard keyboard/mouse/serial
 152  * floppy:      0x2b    onboard Floppy
 153  * power:       0x22    onboard power device (XXX unknown mask bit XXX)
 154  */
 155
 156 static unsigned long irq_mask[0x50] = {
 157         /* SMP */
 158         0,  SUN4M_SOFT_INT(1),
 159         SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
 160         SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
 161         SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
 162         SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
 163         SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
 164         SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
 165         SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
 166         /* soft */
 167         0,  SUN4M_SOFT_INT(1),
 168         SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
 169         SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
 170         SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
 171         SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
 172         SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
 173         SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
 174         SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
 175         /* onboard */
 176         0, 0, 0, 0,
 177         SUN4M_INT_SCSI,  0, SUN4M_INT_ETHERNET, 0,
 178         SUN4M_INT_VIDEO, SUN4M_INT_MODULE,
 179         SUN4M_INT_REALTIME, SUN4M_INT_FLOPPY,
 180         (SUN4M_INT_SERIAL | SUN4M_INT_KBDMS),
 181         SUN4M_INT_AUDIO, 0, SUN4M_INT_MODULE_ERR,
 182         /* sbus */
 183         0, 0, SUN4M_INT_SBUS(0), SUN4M_INT_SBUS(1),
 184         0, SUN4M_INT_SBUS(2), 0, SUN4M_INT_SBUS(3),
 185         0, SUN4M_INT_SBUS(4), 0, SUN4M_INT_SBUS(5),
 186         0, SUN4M_INT_SBUS(6), 0, 0,
 187         /* vme */
 188         0, 0, SUN4M_INT_VME(0), SUN4M_INT_VME(1),
 189         0, SUN4M_INT_VME(2), 0, SUN4M_INT_VME(3),
 190         0, SUN4M_INT_VME(4), 0, SUN4M_INT_VME(5),
 191         0, SUN4M_INT_VME(6), 0, 0
 192 };
 193
 194 static unsigned long sun4m_get_irqmask(unsigned int irq)
 195 {
 196         unsigned long mask;
 197
 198         if (irq < 0x50)
 199                 mask = irq_mask[irq];
 200         else
 201                 mask = 0;
 202
 203         if (!mask)
 204                 printk(KERN_ERR "sun4m_get_irqmask: IRQ%d has no valid mask!\n",
 205                        irq);
 206
 207         return mask;
 208 }
 209
 210 static void sun4m_disable_irq(unsigned int irq_nr)
 211 {
 212         unsigned long mask, flags;
 213         int cpu = smp_processor_id();
 214
 215         mask = sun4m_get_irqmask(irq_nr);
 216         local_irq_save(flags);
 217         if (irq_nr > 15)
 218                 sbus_writel(mask, &sun4m_irq_global->mask_set);
 219         else
 220                 sbus_writel(mask, &sun4m_irq_percpu[cpu]->set);
 221         local_irq_restore(flags);
 222 }
 223
 224 static void sun4m_enable_irq(unsigned int irq_nr)
 225 {
 226         unsigned long mask, flags;
 227         int cpu = smp_processor_id();
 228
 229         /* Dreadful floppy hack. When we use 0x2b instead of
 230          * 0x0b the system blows (it starts to whistle!).
 231          * So we continue to use 0x0b. Fixme ASAP. --P3
 232          */
 233         if (irq_nr != 0x0b) {
 234                 mask = sun4m_get_irqmask(irq_nr);
 235                 local_irq_save(flags);
 236                 if (irq_nr > 15)
 237                         sbus_writel(mask, &sun4m_irq_global->mask_clear);
 238                 else
 239                         sbus_writel(mask, &sun4m_irq_percpu[cpu]->clear);
 240                 local_irq_restore(flags);
 241         } else {
 242                 local_irq_save(flags);
 243                 sbus_writel(SUN4M_INT_FLOPPY, &sun4m_irq_global->mask_clear);
 244                 local_irq_restore(flags);
 245         }
 246 }
 247
 248 static unsigned long cpu_pil_to_imask[16] = {
 249 /*0*/   0x00000000,
 250 /*1*/   0x00000000,
 251 /*2*/   SUN4M_INT_SBUS(0) | SUN4M_INT_VME(0),
 252 /*3*/   SUN4M_INT_SBUS(1) | SUN4M_INT_VME(1),
 253 /*4*/   SUN4M_INT_SCSI,
 254 /*5*/   SUN4M_INT_SBUS(2) | SUN4M_INT_VME(2),
 255 /*6*/   SUN4M_INT_ETHERNET,
 256 /*7*/   SUN4M_INT_SBUS(3) | SUN4M_INT_VME(3),
 257 /*8*/   SUN4M_INT_VIDEO,
 258 /*9*/   SUN4M_INT_SBUS(4) | SUN4M_INT_VME(4) | SUN4M_INT_MODULE_ERR,
 259 /*10*/  SUN4M_INT_REALTIME,
 260 /*11*/  SUN4M_INT_SBUS(5) | SUN4M_INT_VME(5) | SUN4M_INT_FLOPPY,
 261 /*12*/  SUN4M_INT_SERIAL  | SUN4M_INT_KBDMS,
 262 /*13*/  SUN4M_INT_SBUS(6) | SUN4M_INT_VME(6) | SUN4M_INT_AUDIO,
 263 /*14*/  SUN4M_INT_E14,
 264 /*15*/  SUN4M_INT_ERROR
 265 };
 266
 267 /* We assume the caller has disabled local interrupts when these are called,
 268  * or else very bizarre behavior will result.
 269  */
 270 static void sun4m_disable_pil_irq(unsigned int pil)
 271 {
 272         sbus_writel(cpu_pil_to_imask[pil], &sun4m_irq_global->mask_set);
 273 }
 274
 275 static void sun4m_enable_pil_irq(unsigned int pil)
 276 {
 277         sbus_writel(cpu_pil_to_imask[pil], &sun4m_irq_global->mask_clear);
 278 }
 279
 280 #ifdef CONFIG_SMP
 281 static void sun4m_send_ipi(int cpu, int level)
 282 {
 283         unsigned long mask = sun4m_get_irqmask(level);
 284         sbus_writel(mask, &sun4m_irq_percpu[cpu]->set);
 285 }
 286
 287 static void sun4m_clear_ipi(int cpu, int level)
 288 {
 289         unsigned long mask = sun4m_get_irqmask(level);
 290         sbus_writel(mask, &sun4m_irq_percpu[cpu]->clear);
 291 }
 292
 293 static void sun4m_set_udt(int cpu)
 294 {
 295         sbus_writel(cpu, &sun4m_irq_global->interrupt_target);
 296 }
 297 #endif
 298
 299 struct sun4m_timer_percpu {
 300         u32             l14_limit;
 301         u32             l14_count;
 302         u32             l14_limit_noclear;
 303         u32             user_timer_start_stop;
 304 };
 305
 306 static struct sun4m_timer_percpu __iomem *timers_percpu[SUN4M_NCPUS];
 307
 308 struct sun4m_timer_global {
 309         u32             l10_limit;
 310         u32             l10_count;
 311         u32             l10_limit_noclear;
 312         u32             reserved;
 313         u32             timer_config;
 314 };
 315
 316 static struct sun4m_timer_global __iomem *timers_global;
 317
 318 #define TIMER_IRQ       (OBP_INT_LEVEL_ONBOARD | 10)
 319
 320 unsigned int lvl14_resolution = (((1000000/HZ) + 1) << 10);
 321
 322 static void sun4m_clear_clock_irq(void)
 323 {
 324         sbus_readl(&timers_global->l10_limit);
 325 }
 326
 327 void sun4m_nmi(struct pt_regs *regs)
 328 {
 329         unsigned long afsr, afar, si;
 330
 331         printk(KERN_ERR "Aieee: sun4m NMI received!\n");
 332         /* XXX HyperSparc hack XXX */
 333         __asm__ __volatile__("mov 0x500, %%g1\n\t"
 334                              "lda [%%g1] 0x4, %0\n\t"
 335                              "mov 0x600, %%g1\n\t"
 336                              "lda [%%g1] 0x4, %1\n\t" :
 337                              "=r" (afsr), "=r" (afar));
 338         printk(KERN_ERR "afsr=%08lx afar=%08lx\n", afsr, afar);
 339         si = sbus_readl(&sun4m_irq_global->pending);
 340         printk(KERN_ERR "si=%08lx\n", si);
 341         if (si & SUN4M_INT_MODULE_ERR)
 342                 printk(KERN_ERR "Module async error\n");
 343         if (si & SUN4M_INT_M2S_WRITE_ERR)
 344                 printk(KERN_ERR "MBus/SBus async error\n");
 345         if (si & SUN4M_INT_ECC_ERR)
 346                 printk(KERN_ERR "ECC memory error\n");
 347         if (si & SUN4M_INT_VME_ERR)
 348                 printk(KERN_ERR "VME async error\n");
 349         printk(KERN_ERR "you lose buddy boy...\n");
 350         show_regs(regs);
 351         prom_halt();
 352 }
 353
 354 /* Exported for sun4m_smp.c */
 355 void sun4m_clear_profile_irq(int cpu)
 356 {
 357         sbus_readl(&timers_percpu[cpu]->l14_limit);
 358 }
 359
 360 static void sun4m_load_profile_irq(int cpu, unsigned int limit)
 361 {
 362         sbus_writel(limit, &timers_percpu[cpu]->l14_limit);
 363 }
 364
 365 static void __init sun4m_init_timers(irq_handler_t counter_fn)
 366 {
 367         struct device_node *dp = of_find_node_by_name(NULL, "counter");
 368         int i, err, len, num_cpu_timers;
 369         const u32 *addr;
 370
 371         if (!dp) {
 372                 printk(KERN_ERR "sun4m_init_timers: No 'counter' node.\n");
 373                 return;
 374         }
 375
 376         addr = of_get_property(dp, "address", &len);
 377         of_node_put(dp);
 378         if (!addr) {
 379                 printk(KERN_ERR "sun4m_init_timers: No 'address' prop.\n");
 380                 return;
 381         }
 382
 383         num_cpu_timers = (len / sizeof(u32)) - 1;
 384         for (i = 0; i < num_cpu_timers; i++) {
 385                 timers_percpu[i] = (void __iomem *)
 386                         (unsigned long) addr[i];
 387         }
 388         timers_global = (void __iomem *)
 389                 (unsigned long) addr[num_cpu_timers];
 390
 391         sbus_writel((((1000000/HZ) + 1) << 10), &timers_global->l10_limit);
 392
 393         master_l10_counter = &timers_global->l10_count;
 394
 395         err = request_irq(TIMER_IRQ, counter_fn,
 396                           (IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL);
 397         if (err) {
 398                 printk(KERN_ERR "sun4m_init_timers: Register IRQ error %d.\n",
 399                         err);
 400                 return;
 401         }
 402
 403         for (i = 0; i < num_cpu_timers; i++)
 404                 sbus_writel(0, &timers_percpu[i]->l14_limit);
 405         if (num_cpu_timers == 4)
 406                 sbus_writel(SUN4M_INT_E14, &sun4m_irq_global->mask_set);
 407
 408 #ifdef CONFIG_SMP
 409         {
 410                 unsigned long flags;
 411                 extern unsigned long lvl14_save[4];
 412                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 413
 414                 /* For SMP we use the level 14 ticker, however the bootup code
 415                  * has copied the firmware's level 14 vector into the boot cpu's
 416                  * trap table, we must fix this now or we get squashed.
 417                  */
 418                 local_irq_save(flags);
 419                 trap_table->inst_one = lvl14_save[0];
 420                 trap_table->inst_two = lvl14_save[1];
 421                 trap_table->inst_three = lvl14_save[2];
 422                 trap_table->inst_four = lvl14_save[3];
 423                 local_flush_cache_all();
 424                 local_irq_restore(flags);
 425         }
 426 #endif
 427 }
 428
 429 void __init sun4m_init_IRQ(void)
 430 {
 431         struct device_node *dp = of_find_node_by_name(NULL, "interrupt");
 432         int len, i, mid, num_cpu_iregs;
 433         const u32 *addr;
 434
 435         if (!dp) {
 436                 printk(KERN_ERR "sun4m_init_IRQ: No 'interrupt' node.\n");
 437                 return;
 438         }
 439
 440         addr = of_get_property(dp, "address", &len);
 441         of_node_put(dp);
 442         if (!addr) {
 443                 printk(KERN_ERR "sun4m_init_IRQ: No 'address' prop.\n");
 444                 return;
 445         }
 446
 447         num_cpu_iregs = (len / sizeof(u32)) - 1;
 448         for (i = 0; i < num_cpu_iregs; i++) {
 449                 sun4m_irq_percpu[i] = (void __iomem *)
 450                         (unsigned long) addr[i];
 451         }
 452         sun4m_irq_global = (void __iomem *)
 453                 (unsigned long) addr[num_cpu_iregs];
 454
 455         local_irq_disable();
 456
 457         sbus_writel(~SUN4M_INT_MASKALL, &sun4m_irq_global->mask_set);
 458         for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
 459                 sbus_writel(~0x17fff, &sun4m_irq_percpu[mid]->clear);
 460
 461         if (num_cpu_iregs == 4)
 462                 sbus_writel(0, &sun4m_irq_global->interrupt_target);
 463
 464         BTFIXUPSET_CALL(enable_irq, sun4m_enable_irq, BTFIXUPCALL_NORM);
 465         BTFIXUPSET_CALL(disable_irq, sun4m_disable_irq, BTFIXUPCALL_NORM);
 466         BTFIXUPSET_CALL(enable_pil_irq, sun4m_enable_pil_irq, BTFIXUPCALL_NORM);
 467         BTFIXUPSET_CALL(disable_pil_irq, sun4m_disable_pil_irq, BTFIXUPCALL_NORM);
 468         BTFIXUPSET_CALL(clear_clock_irq, sun4m_clear_clock_irq, BTFIXUPCALL_NORM);
 469         BTFIXUPSET_CALL(load_profile_irq, sun4m_load_profile_irq, BTFIXUPCALL_NORM);
 470         sparc_init_timers = sun4m_init_timers;
 471 #ifdef CONFIG_SMP
 472         BTFIXUPSET_CALL(set_cpu_int, sun4m_send_ipi, BTFIXUPCALL_NORM);
 473         BTFIXUPSET_CALL(clear_cpu_int, sun4m_clear_ipi, BTFIXUPCALL_NORM);
 474         BTFIXUPSET_CALL(set_irq_udt, sun4m_set_udt, BTFIXUPCALL_NORM);
 475 #endif
 476
 477         /* Cannot enable interrupts until OBP ticker is disabled. */
 478 }