arch/sparc/kernel/sun4m_irq.c

   1 /*
   2  * sun4m irq support
   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/slab.h>
  13
  14 #include <asm/timer.h>
  15 #include <asm/traps.h>
  16 #include <asm/pgalloc.h>
  17 #include <asm/pgtable.h>
  18 #include <asm/irq.h>
  19 #include <asm/io.h>
  20 #include <asm/cacheflush.h>
  21
  22 #include "irq.h"
  23 #include "kernel.h"
  24
  25 /* Sample sun4m IRQ layout:
  26  *
  27  * 0x22 - Power
  28  * 0x24 - ESP SCSI
  29  * 0x26 - Lance ethernet
  30  * 0x2b - Floppy
  31  * 0x2c - Zilog uart
  32  * 0x32 - SBUS level 0
  33  * 0x33 - Parallel port, SBUS level 1
  34  * 0x35 - SBUS level 2
  35  * 0x37 - SBUS level 3
  36  * 0x39 - Audio, Graphics card, SBUS level 4
  37  * 0x3b - SBUS level 5
  38  * 0x3d - SBUS level 6
  39  *
  40  * Each interrupt source has a mask bit in the interrupt registers.
  41  * When the mask bit is set, this blocks interrupt deliver.  So you
  42  * clear the bit to enable the interrupt.
  43  *
  44  * Interrupts numbered less than 0x10 are software triggered interrupts
  45  * and unused by Linux.
  46  *
  47  * Interrupt level assignment on sun4m:
  48  *
  49  *      level           source
  50  * ------------------------------------------------------------
  51  *        1             softint-1
  52  *        2             softint-2, VME/SBUS level 1
  53  *        3             softint-3, VME/SBUS level 2
  54  *        4             softint-4, onboard SCSI
  55  *        5             softint-5, VME/SBUS level 3
  56  *        6             softint-6, onboard ETHERNET
  57  *        7             softint-7, VME/SBUS level 4
  58  *        8             softint-8, onboard VIDEO
  59  *        9             softint-9, VME/SBUS level 5, Module Interrupt
  60  *       10             softint-10, system counter/timer
  61  *       11             softint-11, VME/SBUS level 6, Floppy
  62  *       12             softint-12, Keyboard/Mouse, Serial
  63  *       13             softint-13, VME/SBUS level 7, ISDN Audio
  64  *       14             softint-14, per-processor counter/timer
  65  *       15             softint-15, Asynchronous Errors (broadcast)
  66  *
  67  * Each interrupt source is masked distinctly in the sun4m interrupt
  68  * registers.  The PIL level alone is therefore ambiguous, since multiple
  69  * interrupt sources map to a single PIL.
  70  *
  71  * This ambiguity is resolved in the 'intr' property for device nodes
  72  * in the OF device tree.  Each 'intr' property entry is composed of
  73  * two 32-bit words.  The first word is the IRQ priority value, which
  74  * is what we're intersted in.  The second word is the IRQ vector, which
  75  * is unused.
  76  *
  77  * The low 4 bits of the IRQ priority indicate the PIL, and the upper
  78  * 4 bits indicate onboard vs. SBUS leveled vs. VME leveled.  0x20
  79  * means onboard, 0x30 means SBUS leveled, and 0x40 means VME leveled.
  80  *
  81  * For example, an 'intr' IRQ priority value of 0x24 is onboard SCSI
  82  * whereas a value of 0x33 is SBUS level 2.  Here are some sample
  83  * 'intr' property IRQ priority values from ss4, ss5, ss10, ss20, and
  84  * Tadpole S3 GX systems.
  85  *
  86  * esp:         0x24    onboard ESP SCSI
  87  * le:          0x26    onboard Lance ETHERNET
  88  * p9100:       0x32    SBUS level 1 P9100 video
  89  * bpp:         0x33    SBUS level 2 BPP parallel port device
  90  * DBRI:        0x39    SBUS level 5 DBRI ISDN audio
  91  * SUNW,leo:    0x39    SBUS level 5 LEO video
  92  * pcmcia:      0x3b    SBUS level 6 PCMCIA controller
  93  * uctrl:       0x3b    SBUS level 6 UCTRL device
  94  * modem:       0x3d    SBUS level 7 MODEM
  95  * zs:          0x2c    onboard keyboard/mouse/serial
  96  * floppy:      0x2b    onboard Floppy
  97  * power:       0x22    onboard power device (XXX unknown mask bit XXX)
  98  */
  99
 100
 101 /* Code in entry.S needs to get at these register mappings.  */
 102 struct sun4m_irq_percpu __iomem *sun4m_irq_percpu[SUN4M_NCPUS];
 103 struct sun4m_irq_global __iomem *sun4m_irq_global;
 104
 105 struct sun4m_handler_data {
 106         bool    percpu;
 107         long    mask;
 108 };
 109
 110 /* Dave Redman (djhr@tadpole.co.uk)
 111  * The sun4m interrupt registers.
 112  */
 113 #define SUN4M_INT_ENABLE        0x80000000
 114 #define SUN4M_INT_E14           0x00000080
 115 #define SUN4M_INT_E10           0x00080000
 116
 117 #define SUN4M_INT_MASKALL       0x80000000        /* mask all interrupts */
 118 #define SUN4M_INT_MODULE_ERR    0x40000000        /* module error */
 119 #define SUN4M_INT_M2S_WRITE_ERR 0x20000000        /* write buffer error */
 120 #define SUN4M_INT_ECC_ERR       0x10000000        /* ecc memory error */
 121 #define SUN4M_INT_VME_ERR       0x08000000        /* vme async error */
 122 #define SUN4M_INT_FLOPPY        0x00400000        /* floppy disk */
 123 #define SUN4M_INT_MODULE        0x00200000        /* module interrupt */
 124 #define SUN4M_INT_VIDEO         0x00100000        /* onboard video */
 125 #define SUN4M_INT_REALTIME      0x00080000        /* system timer */
 126 #define SUN4M_INT_SCSI          0x00040000        /* onboard scsi */
 127 #define SUN4M_INT_AUDIO         0x00020000        /* audio/isdn */
 128 #define SUN4M_INT_ETHERNET      0x00010000        /* onboard ethernet */
 129 #define SUN4M_INT_SERIAL        0x00008000        /* serial ports */
 130 #define SUN4M_INT_KBDMS         0x00004000        /* keyboard/mouse */
 131 #define SUN4M_INT_SBUSBITS      0x00003F80        /* sbus int bits */
 132 #define SUN4M_INT_VMEBITS       0x0000007F        /* vme int bits */
 133
 134 #define SUN4M_INT_ERROR         (SUN4M_INT_MODULE_ERR |    \
 135                                  SUN4M_INT_M2S_WRITE_ERR | \
 136                                  SUN4M_INT_ECC_ERR |       \
 137                                  SUN4M_INT_VME_ERR)
 138
 139 #define SUN4M_INT_SBUS(x)       (1 << (x+7))
 140 #define SUN4M_INT_VME(x)        (1 << (x))
 141
 142 /* Interrupt levels used by OBP */
 143 #define OBP_INT_LEVEL_SOFT      0x10
 144 #define OBP_INT_LEVEL_ONBOARD   0x20
 145 #define OBP_INT_LEVEL_SBUS      0x30
 146 #define OBP_INT_LEVEL_VME       0x40
 147
 148 #define SUN4M_TIMER_IRQ         (OBP_INT_LEVEL_ONBOARD | 10)
 149 #define SUN4M_PROFILE_IRQ       (OBP_INT_LEVEL_ONBOARD | 14)
 150
 151 static unsigned long sun4m_imask[0x50] = {
 152         /* 0x00 - SMP */
 153         0,  SUN4M_SOFT_INT(1),
 154         SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
 155         SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
 156         SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
 157         SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
 158         SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
 159         SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
 160         SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
 161         /* 0x10 - soft */
 162         0,  SUN4M_SOFT_INT(1),
 163         SUN4M_SOFT_INT(2),  SUN4M_SOFT_INT(3),
 164         SUN4M_SOFT_INT(4),  SUN4M_SOFT_INT(5),
 165         SUN4M_SOFT_INT(6),  SUN4M_SOFT_INT(7),
 166         SUN4M_SOFT_INT(8),  SUN4M_SOFT_INT(9),
 167         SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11),
 168         SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13),
 169         SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15),
 170         /* 0x20 - onboard */
 171         0, 0, 0, 0,
 172         SUN4M_INT_SCSI,  0, SUN4M_INT_ETHERNET, 0,
 173         SUN4M_INT_VIDEO, SUN4M_INT_MODULE,
 174         SUN4M_INT_REALTIME, SUN4M_INT_FLOPPY,
 175         (SUN4M_INT_SERIAL | SUN4M_INT_KBDMS),
 176         SUN4M_INT_AUDIO, SUN4M_INT_E14, SUN4M_INT_MODULE_ERR,
 177         /* 0x30 - sbus */
 178         0, 0, SUN4M_INT_SBUS(0), SUN4M_INT_SBUS(1),
 179         0, SUN4M_INT_SBUS(2), 0, SUN4M_INT_SBUS(3),
 180         0, SUN4M_INT_SBUS(4), 0, SUN4M_INT_SBUS(5),
 181         0, SUN4M_INT_SBUS(6), 0, 0,
 182         /* 0x40 - vme */
 183         0, 0, SUN4M_INT_VME(0), SUN4M_INT_VME(1),
 184         0, SUN4M_INT_VME(2), 0, SUN4M_INT_VME(3),
 185         0, SUN4M_INT_VME(4), 0, SUN4M_INT_VME(5),
 186         0, SUN4M_INT_VME(6), 0, 0
 187 };
 188
 189 static void sun4m_mask_irq(struct irq_data *data)
 190 {
 191         struct sun4m_handler_data *handler_data;
 192         int cpu = smp_processor_id();
 193
 194         handler_data = irq_data_get_irq_handler_data(data);
 195         if (handler_data->mask) {
 196                 unsigned long flags;
 197
 198                 local_irq_save(flags);
 199                 if (handler_data->percpu) {
 200                         sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->set);
 201                 } else {
 202                         sbus_writel(handler_data->mask, &sun4m_irq_global->mask_set);
 203                 }
 204                 local_irq_restore(flags);
 205         }
 206 }
 207
 208 static void sun4m_unmask_irq(struct irq_data *data)
 209 {
 210         struct sun4m_handler_data *handler_data;
 211         int cpu = smp_processor_id();
 212
 213         handler_data = irq_data_get_irq_handler_data(data);
 214         if (handler_data->mask) {
 215                 unsigned long flags;
 216
 217                 local_irq_save(flags);
 218                 if (handler_data->percpu) {
 219                         sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->clear);
 220                 } else {
 221                         sbus_writel(handler_data->mask, &sun4m_irq_global->mask_clear);
 222                 }
 223                 local_irq_restore(flags);
 224         }
 225 }
 226
 227 static unsigned int sun4m_startup_irq(struct irq_data *data)
 228 {
 229         irq_link(data->irq);
 230         sun4m_unmask_irq(data);
 231         return 0;
 232 }
 233
 234 static void sun4m_shutdown_irq(struct irq_data *data)
 235 {
 236         sun4m_mask_irq(data);
 237         irq_unlink(data->irq);
 238 }
 239
 240 static struct irq_chip sun4m_irq = {
 241         .name           = "sun4m",
 242         .irq_startup    = sun4m_startup_irq,
 243         .irq_shutdown   = sun4m_shutdown_irq,
 244         .irq_mask       = sun4m_mask_irq,
 245         .irq_unmask     = sun4m_unmask_irq,
 246 };
 247
 248
 249 static unsigned int sun4m_build_device_irq(struct platform_device *op,
 250                                            unsigned int real_irq)
 251 {
 252         struct sun4m_handler_data *handler_data;
 253         unsigned int irq;
 254         unsigned int pil;
 255
 256         if (real_irq >= OBP_INT_LEVEL_VME) {
 257                 prom_printf("Bogus sun4m IRQ %u\n", real_irq);
 258                 prom_halt();
 259         }
 260         pil = (real_irq & 0xf);
 261         irq = irq_alloc(real_irq, pil);
 262
 263         if (irq == 0)
 264                 goto out;
 265
 266         handler_data = irq_get_handler_data(irq);
 267         if (unlikely(handler_data))
 268                 goto out;
 269
 270         handler_data = kzalloc(sizeof(struct sun4m_handler_data), GFP_ATOMIC);
 271         if (unlikely(!handler_data)) {
 272                 prom_printf("IRQ: kzalloc(sun4m_handler_data) failed.\n");
 273                 prom_halt();
 274         }
 275
 276         handler_data->mask = sun4m_imask[real_irq];
 277         handler_data->percpu = real_irq < OBP_INT_LEVEL_ONBOARD;
 278         irq_set_chip_and_handler_name(irq, &sun4m_irq,
 279                                       handle_level_irq, "level");
 280         irq_set_handler_data(irq, handler_data);
 281
 282 out:
 283         return irq;
 284 }
 285
 286 struct sun4m_timer_percpu {
 287         u32             l14_limit;
 288         u32             l14_count;
 289         u32             l14_limit_noclear;
 290         u32             user_timer_start_stop;
 291 };
 292
 293 static struct sun4m_timer_percpu __iomem *timers_percpu[SUN4M_NCPUS];
 294
 295 struct sun4m_timer_global {
 296         u32             l10_limit;
 297         u32             l10_count;
 298         u32             l10_limit_noclear;
 299         u32             reserved;
 300         u32             timer_config;
 301 };
 302
 303 static struct sun4m_timer_global __iomem *timers_global;
 304
 305 static void sun4m_clear_clock_irq(void)
 306 {
 307         sbus_readl(&timers_global->l10_limit);
 308 }
 309
 310 void sun4m_nmi(struct pt_regs *regs)
 311 {
 312         unsigned long afsr, afar, si;
 313
 314         printk(KERN_ERR "Aieee: sun4m NMI received!\n");
 315         /* XXX HyperSparc hack XXX */
 316         __asm__ __volatile__("mov 0x500, %%g1\n\t"
 317                              "lda [%%g1] 0x4, %0\n\t"
 318                              "mov 0x600, %%g1\n\t"
 319                              "lda [%%g1] 0x4, %1\n\t" :
 320                              "=r" (afsr), "=r" (afar));
 321         printk(KERN_ERR "afsr=%08lx afar=%08lx\n", afsr, afar);
 322         si = sbus_readl(&sun4m_irq_global->pending);
 323         printk(KERN_ERR "si=%08lx\n", si);
 324         if (si & SUN4M_INT_MODULE_ERR)
 325                 printk(KERN_ERR "Module async error\n");
 326         if (si & SUN4M_INT_M2S_WRITE_ERR)
 327                 printk(KERN_ERR "MBus/SBus async error\n");
 328         if (si & SUN4M_INT_ECC_ERR)
 329                 printk(KERN_ERR "ECC memory error\n");
 330         if (si & SUN4M_INT_VME_ERR)
 331                 printk(KERN_ERR "VME async error\n");
 332         printk(KERN_ERR "you lose buddy boy...\n");
 333         show_regs(regs);
 334         prom_halt();
 335 }
 336
 337 void sun4m_unmask_profile_irq(void)
 338 {
 339         unsigned long flags;
 340
 341         local_irq_save(flags);
 342         sbus_writel(sun4m_imask[SUN4M_PROFILE_IRQ], &sun4m_irq_global->mask_clear);
 343         local_irq_restore(flags);
 344 }
 345
 346 void sun4m_clear_profile_irq(int cpu)
 347 {
 348         sbus_readl(&timers_percpu[cpu]->l14_limit);
 349 }
 350
 351 static void sun4m_load_profile_irq(int cpu, unsigned int limit)
 352 {
 353         unsigned int value = limit ? timer_value(limit) : 0;
 354         sbus_writel(value, &timers_percpu[cpu]->l14_limit);
 355 }
 356
 357 static void __init sun4m_init_timers(void)
 358 {
 359         struct device_node *dp = of_find_node_by_name(NULL, "counter");
 360         int i, err, len, num_cpu_timers;
 361         unsigned int irq;
 362         const u32 *addr;
 363
 364         if (!dp) {
 365                 printk(KERN_ERR "sun4m_init_timers: No 'counter' node.\n");
 366                 return;
 367         }
 368
 369         addr = of_get_property(dp, "address", &len);
 370         of_node_put(dp);
 371         if (!addr) {
 372                 printk(KERN_ERR "sun4m_init_timers: No 'address' prop.\n");
 373                 return;
 374         }
 375
 376         num_cpu_timers = (len / sizeof(u32)) - 1;
 377         for (i = 0; i < num_cpu_timers; i++) {
 378                 timers_percpu[i] = (void __iomem *)
 379                         (unsigned long) addr[i];
 380         }
 381         timers_global = (void __iomem *)
 382                 (unsigned long) addr[num_cpu_timers];
 383
 384         /* Every per-cpu timer works in timer mode */
 385         sbus_writel(0x00000000, &timers_global->timer_config);
 386
 387 #ifdef CONFIG_SMP
 388         sparc_config.cs_period = SBUS_CLOCK_RATE * 2;  /* 2 seconds */
 389         sparc_config.features |= FEAT_L14_ONESHOT;
 390 #else
 391         sparc_config.cs_period = SBUS_CLOCK_RATE / HZ; /* 1/HZ sec  */
 392         sparc_config.features |= FEAT_L10_CLOCKEVENT;
 393 #endif
 394         sparc_config.features |= FEAT_L10_CLOCKSOURCE;
 395         sbus_writel(timer_value(sparc_config.cs_period),
 396                     &timers_global->l10_limit);
 397
 398         master_l10_counter = &timers_global->l10_count;
 399
 400         irq = sun4m_build_device_irq(NULL, SUN4M_TIMER_IRQ);
 401
 402         err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL);
 403         if (err) {
 404                 printk(KERN_ERR "sun4m_init_timers: Register IRQ error %d.\n",
 405                         err);
 406                 return;
 407         }
 408
 409         for (i = 0; i < num_cpu_timers; i++)
 410                 sbus_writel(0, &timers_percpu[i]->l14_limit);
 411         if (num_cpu_timers == 4)
 412                 sbus_writel(SUN4M_INT_E14, &sun4m_irq_global->mask_set);
 413
 414 #ifdef CONFIG_SMP
 415         {
 416                 unsigned long flags;
 417                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
 418
 419                 /* For SMP we use the level 14 ticker, however the bootup code
 420                  * has copied the firmware's level 14 vector into the boot cpu's
 421                  * trap table, we must fix this now or we get squashed.
 422                  */
 423                 local_irq_save(flags);
 424                 trap_table->inst_one = lvl14_save[0];
 425                 trap_table->inst_two = lvl14_save[1];
 426                 trap_table->inst_three = lvl14_save[2];
 427                 trap_table->inst_four = lvl14_save[3];
 428                 local_ops->cache_all();
 429                 local_irq_restore(flags);
 430         }
 431 #endif
 432 }
 433
 434 void __init sun4m_init_IRQ(void)
 435 {
 436         struct device_node *dp = of_find_node_by_name(NULL, "interrupt");
 437         int len, i, mid, num_cpu_iregs;
 438         const u32 *addr;
 439
 440         if (!dp) {
 441                 printk(KERN_ERR "sun4m_init_IRQ: No 'interrupt' node.\n");
 442                 return;
 443         }
 444
 445         addr = of_get_property(dp, "address", &len);
 446         of_node_put(dp);
 447         if (!addr) {
 448                 printk(KERN_ERR "sun4m_init_IRQ: No 'address' prop.\n");
 449                 return;
 450         }
 451
 452         num_cpu_iregs = (len / sizeof(u32)) - 1;
 453         for (i = 0; i < num_cpu_iregs; i++) {
 454                 sun4m_irq_percpu[i] = (void __iomem *)
 455                         (unsigned long) addr[i];
 456         }
 457         sun4m_irq_global = (void __iomem *)
 458                 (unsigned long) addr[num_cpu_iregs];
 459
 460         local_irq_disable();
 461
 462         sbus_writel(~SUN4M_INT_MASKALL, &sun4m_irq_global->mask_set);
 463         for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
 464                 sbus_writel(~0x17fff, &sun4m_irq_percpu[mid]->clear);
 465
 466         if (num_cpu_iregs == 4)
 467                 sbus_writel(0, &sun4m_irq_global->interrupt_target);
 468
 469         sparc_config.init_timers      = sun4m_init_timers;
 470         sparc_config.build_device_irq = sun4m_build_device_irq;
 471         sparc_config.clock_rate       = SBUS_CLOCK_RATE;
 472         sparc_config.clear_clock_irq  = sun4m_clear_clock_irq;
 473         sparc_config.load_profile_irq = sun4m_load_profile_irq;
 474
 475
 476         /* Cannot enable interrupts until OBP ticker is disabled. */
 477 }