1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * sun4m irq support 4 * 5 * djhr: Hacked out of irq.c into a CPU dependent version. 6 * 7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 8 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx) 9 * Copyright (C) 1995 Pete A. Zaitcev (zaitcev@yahoo.com) 10 * Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk) 11 */ 12 13 #include <linux/slab.h> 14 #include <linux/sched/debug.h> 15 #include <linux/pgtable.h> 16 17 #include <asm/timer.h> 18 #include <asm/traps.h> 19 #include <asm/pgalloc.h> 20 #include <asm/irq.h> 21 #include <asm/io.h> 22 #include <asm/cacheflush.h> 23 24 #include "irq.h" 25 #include "kernel.h" 26 27 /* Sample sun4m IRQ layout: 28 * 29 * 0x22 - Power 30 * 0x24 - ESP SCSI 31 * 0x26 - Lance ethernet 32 * 0x2b - Floppy 33 * 0x2c - Zilog uart 34 * 0x32 - SBUS level 0 35 * 0x33 - Parallel port, SBUS level 1 36 * 0x35 - SBUS level 2 37 * 0x37 - SBUS level 3 38 * 0x39 - Audio, Graphics card, SBUS level 4 39 * 0x3b - SBUS level 5 40 * 0x3d - SBUS level 6 41 * 42 * Each interrupt source has a mask bit in the interrupt registers. 43 * When the mask bit is set, this blocks interrupt deliver. So you 44 * clear the bit to enable the interrupt. 45 * 46 * Interrupts numbered less than 0x10 are software triggered interrupts 47 * and unused by Linux. 48 * 49 * Interrupt level assignment on sun4m: 50 * 51 * level source 52 * ------------------------------------------------------------ 53 * 1 softint-1 54 * 2 softint-2, VME/SBUS level 1 55 * 3 softint-3, VME/SBUS level 2 56 * 4 softint-4, onboard SCSI 57 * 5 softint-5, VME/SBUS level 3 58 * 6 softint-6, onboard ETHERNET 59 * 7 softint-7, VME/SBUS level 4 60 * 8 softint-8, onboard VIDEO 61 * 9 softint-9, VME/SBUS level 5, Module Interrupt 62 * 10 softint-10, system counter/timer 63 * 11 softint-11, VME/SBUS level 6, Floppy 64 * 12 softint-12, Keyboard/Mouse, Serial 65 * 13 softint-13, VME/SBUS level 7, ISDN Audio 66 * 14 softint-14, per-processor counter/timer 67 * 15 softint-15, Asynchronous Errors (broadcast) 68 * 69 * Each interrupt source is masked distinctly in the sun4m interrupt 70 * registers. The PIL level alone is therefore ambiguous, since multiple 71 * interrupt sources map to a single PIL. 72 * 73 * This ambiguity is resolved in the 'intr' property for device nodes 74 * in the OF device tree. Each 'intr' property entry is composed of 75 * two 32-bit words. The first word is the IRQ priority value, which 76 * is what we're intersted in. The second word is the IRQ vector, which 77 * is unused. 78 * 79 * The low 4 bits of the IRQ priority indicate the PIL, and the upper 80 * 4 bits indicate onboard vs. SBUS leveled vs. VME leveled. 0x20 81 * means onboard, 0x30 means SBUS leveled, and 0x40 means VME leveled. 82 * 83 * For example, an 'intr' IRQ priority value of 0x24 is onboard SCSI 84 * whereas a value of 0x33 is SBUS level 2. Here are some sample 85 * 'intr' property IRQ priority values from ss4, ss5, ss10, ss20, and 86 * Tadpole S3 GX systems. 87 * 88 * esp: 0x24 onboard ESP SCSI 89 * le: 0x26 onboard Lance ETHERNET 90 * p9100: 0x32 SBUS level 1 P9100 video 91 * bpp: 0x33 SBUS level 2 BPP parallel port device 92 * DBRI: 0x39 SBUS level 5 DBRI ISDN audio 93 * SUNW,leo: 0x39 SBUS level 5 LEO video 94 * pcmcia: 0x3b SBUS level 6 PCMCIA controller 95 * uctrl: 0x3b SBUS level 6 UCTRL device 96 * modem: 0x3d SBUS level 7 MODEM 97 * zs: 0x2c onboard keyboard/mouse/serial 98 * floppy: 0x2b onboard Floppy 99 * power: 0x22 onboard power device (XXX unknown mask bit XXX) 100 */ 101 102 103 /* Code in entry.S needs to get at these register mappings. */ 104 struct sun4m_irq_percpu __iomem *sun4m_irq_percpu[SUN4M_NCPUS]; 105 struct sun4m_irq_global __iomem *sun4m_irq_global; 106 107 struct sun4m_handler_data { 108 bool percpu; 109 long mask; 110 }; 111 112 /* Dave Redman (djhr@tadpole.co.uk) 113 * The sun4m interrupt registers. 114 */ 115 #define SUN4M_INT_ENABLE 0x80000000 116 #define SUN4M_INT_E14 0x00000080 117 #define SUN4M_INT_E10 0x00080000 118 119 #define SUN4M_INT_MASKALL 0x80000000 /* mask all interrupts */ 120 #define SUN4M_INT_MODULE_ERR 0x40000000 /* module error */ 121 #define SUN4M_INT_M2S_WRITE_ERR 0x20000000 /* write buffer error */ 122 #define SUN4M_INT_ECC_ERR 0x10000000 /* ecc memory error */ 123 #define SUN4M_INT_VME_ERR 0x08000000 /* vme async error */ 124 #define SUN4M_INT_FLOPPY 0x00400000 /* floppy disk */ 125 #define SUN4M_INT_MODULE 0x00200000 /* module interrupt */ 126 #define SUN4M_INT_VIDEO 0x00100000 /* onboard video */ 127 #define SUN4M_INT_REALTIME 0x00080000 /* system timer */ 128 #define SUN4M_INT_SCSI 0x00040000 /* onboard scsi */ 129 #define SUN4M_INT_AUDIO 0x00020000 /* audio/isdn */ 130 #define SUN4M_INT_ETHERNET 0x00010000 /* onboard ethernet */ 131 #define SUN4M_INT_SERIAL 0x00008000 /* serial ports */ 132 #define SUN4M_INT_KBDMS 0x00004000 /* keyboard/mouse */ 133 #define SUN4M_INT_SBUSBITS 0x00003F80 /* sbus int bits */ 134 #define SUN4M_INT_VMEBITS 0x0000007F /* vme int bits */ 135 136 #define SUN4M_INT_ERROR (SUN4M_INT_MODULE_ERR | \ 137 SUN4M_INT_M2S_WRITE_ERR | \ 138 SUN4M_INT_ECC_ERR | \ 139 SUN4M_INT_VME_ERR) 140 141 #define SUN4M_INT_SBUS(x) (1 << (x+7)) 142 #define SUN4M_INT_VME(x) (1 << (x)) 143 144 /* Interrupt levels used by OBP */ 145 #define OBP_INT_LEVEL_SOFT 0x10 146 #define OBP_INT_LEVEL_ONBOARD 0x20 147 #define OBP_INT_LEVEL_SBUS 0x30 148 #define OBP_INT_LEVEL_VME 0x40 149 150 #define SUN4M_TIMER_IRQ (OBP_INT_LEVEL_ONBOARD | 10) 151 #define SUN4M_PROFILE_IRQ (OBP_INT_LEVEL_ONBOARD | 14) 152 153 static unsigned long sun4m_imask[0x50] = { 154 /* 0x00 - SMP */ 155 0, SUN4M_SOFT_INT(1), 156 SUN4M_SOFT_INT(2), SUN4M_SOFT_INT(3), 157 SUN4M_SOFT_INT(4), SUN4M_SOFT_INT(5), 158 SUN4M_SOFT_INT(6), SUN4M_SOFT_INT(7), 159 SUN4M_SOFT_INT(8), SUN4M_SOFT_INT(9), 160 SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11), 161 SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13), 162 SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15), 163 /* 0x10 - soft */ 164 0, SUN4M_SOFT_INT(1), 165 SUN4M_SOFT_INT(2), SUN4M_SOFT_INT(3), 166 SUN4M_SOFT_INT(4), SUN4M_SOFT_INT(5), 167 SUN4M_SOFT_INT(6), SUN4M_SOFT_INT(7), 168 SUN4M_SOFT_INT(8), SUN4M_SOFT_INT(9), 169 SUN4M_SOFT_INT(10), SUN4M_SOFT_INT(11), 170 SUN4M_SOFT_INT(12), SUN4M_SOFT_INT(13), 171 SUN4M_SOFT_INT(14), SUN4M_SOFT_INT(15), 172 /* 0x20 - onboard */ 173 0, 0, 0, 0, 174 SUN4M_INT_SCSI, 0, SUN4M_INT_ETHERNET, 0, 175 SUN4M_INT_VIDEO, SUN4M_INT_MODULE, 176 SUN4M_INT_REALTIME, SUN4M_INT_FLOPPY, 177 (SUN4M_INT_SERIAL | SUN4M_INT_KBDMS), 178 SUN4M_INT_AUDIO, SUN4M_INT_E14, SUN4M_INT_MODULE_ERR, 179 /* 0x30 - sbus */ 180 0, 0, SUN4M_INT_SBUS(0), SUN4M_INT_SBUS(1), 181 0, SUN4M_INT_SBUS(2), 0, SUN4M_INT_SBUS(3), 182 0, SUN4M_INT_SBUS(4), 0, SUN4M_INT_SBUS(5), 183 0, SUN4M_INT_SBUS(6), 0, 0, 184 /* 0x40 - vme */ 185 0, 0, SUN4M_INT_VME(0), SUN4M_INT_VME(1), 186 0, SUN4M_INT_VME(2), 0, SUN4M_INT_VME(3), 187 0, SUN4M_INT_VME(4), 0, SUN4M_INT_VME(5), 188 0, SUN4M_INT_VME(6), 0, 0 189 }; 190 191 static void sun4m_mask_irq(struct irq_data *data) 192 { 193 struct sun4m_handler_data *handler_data; 194 int cpu = smp_processor_id(); 195 196 handler_data = irq_data_get_irq_handler_data(data); 197 if (handler_data->mask) { 198 unsigned long flags; 199 200 local_irq_save(flags); 201 if (handler_data->percpu) { 202 sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->set); 203 } else { 204 sbus_writel(handler_data->mask, &sun4m_irq_global->mask_set); 205 } 206 local_irq_restore(flags); 207 } 208 } 209 210 static void sun4m_unmask_irq(struct irq_data *data) 211 { 212 struct sun4m_handler_data *handler_data; 213 int cpu = smp_processor_id(); 214 215 handler_data = irq_data_get_irq_handler_data(data); 216 if (handler_data->mask) { 217 unsigned long flags; 218 219 local_irq_save(flags); 220 if (handler_data->percpu) { 221 sbus_writel(handler_data->mask, &sun4m_irq_percpu[cpu]->clear); 222 } else { 223 sbus_writel(handler_data->mask, &sun4m_irq_global->mask_clear); 224 } 225 local_irq_restore(flags); 226 } 227 } 228 229 static unsigned int sun4m_startup_irq(struct irq_data *data) 230 { 231 irq_link(data->irq); 232 sun4m_unmask_irq(data); 233 return 0; 234 } 235 236 static void sun4m_shutdown_irq(struct irq_data *data) 237 { 238 sun4m_mask_irq(data); 239 irq_unlink(data->irq); 240 } 241 242 static struct irq_chip sun4m_irq = { 243 .name = "sun4m", 244 .irq_startup = sun4m_startup_irq, 245 .irq_shutdown = sun4m_shutdown_irq, 246 .irq_mask = sun4m_mask_irq, 247 .irq_unmask = sun4m_unmask_irq, 248 }; 249 250 251 static unsigned int sun4m_build_device_irq(struct platform_device *op, 252 unsigned int real_irq) 253 { 254 struct sun4m_handler_data *handler_data; 255 unsigned int irq; 256 unsigned int pil; 257 258 if (real_irq >= OBP_INT_LEVEL_VME) { 259 prom_printf("Bogus sun4m IRQ %u\n", real_irq); 260 prom_halt(); 261 } 262 pil = (real_irq & 0xf); 263 irq = irq_alloc(real_irq, pil); 264 265 if (irq == 0) 266 goto out; 267 268 handler_data = irq_get_handler_data(irq); 269 if (unlikely(handler_data)) 270 goto out; 271 272 handler_data = kzalloc(sizeof(struct sun4m_handler_data), GFP_ATOMIC); 273 if (unlikely(!handler_data)) { 274 prom_printf("IRQ: kzalloc(sun4m_handler_data) failed.\n"); 275 prom_halt(); 276 } 277 278 handler_data->mask = sun4m_imask[real_irq]; 279 handler_data->percpu = real_irq < OBP_INT_LEVEL_ONBOARD; 280 irq_set_chip_and_handler_name(irq, &sun4m_irq, 281 handle_level_irq, "level"); 282 irq_set_handler_data(irq, handler_data); 283 284 out: 285 return irq; 286 } 287 288 struct sun4m_timer_percpu { 289 u32 l14_limit; 290 u32 l14_count; 291 u32 l14_limit_noclear; 292 u32 user_timer_start_stop; 293 }; 294 295 static struct sun4m_timer_percpu __iomem *timers_percpu[SUN4M_NCPUS]; 296 297 struct sun4m_timer_global { 298 u32 l10_limit; 299 u32 l10_count; 300 u32 l10_limit_noclear; 301 u32 reserved; 302 u32 timer_config; 303 }; 304 305 static struct sun4m_timer_global __iomem *timers_global; 306 307 static void sun4m_clear_clock_irq(void) 308 { 309 sbus_readl(&timers_global->l10_limit); 310 } 311 312 void sun4m_nmi(struct pt_regs *regs) 313 { 314 unsigned long afsr, afar, si; 315 316 printk(KERN_ERR "Aieee: sun4m NMI received!\n"); 317 /* XXX HyperSparc hack XXX */ 318 __asm__ __volatile__("mov 0x500, %%g1\n\t" 319 "lda [%%g1] 0x4, %0\n\t" 320 "mov 0x600, %%g1\n\t" 321 "lda [%%g1] 0x4, %1\n\t" : 322 "=r" (afsr), "=r" (afar)); 323 printk(KERN_ERR "afsr=%08lx afar=%08lx\n", afsr, afar); 324 si = sbus_readl(&sun4m_irq_global->pending); 325 printk(KERN_ERR "si=%08lx\n", si); 326 if (si & SUN4M_INT_MODULE_ERR) 327 printk(KERN_ERR "Module async error\n"); 328 if (si & SUN4M_INT_M2S_WRITE_ERR) 329 printk(KERN_ERR "MBus/SBus async error\n"); 330 if (si & SUN4M_INT_ECC_ERR) 331 printk(KERN_ERR "ECC memory error\n"); 332 if (si & SUN4M_INT_VME_ERR) 333 printk(KERN_ERR "VME async error\n"); 334 printk(KERN_ERR "you lose buddy boy...\n"); 335 show_regs(regs); 336 prom_halt(); 337 } 338 339 void sun4m_unmask_profile_irq(void) 340 { 341 unsigned long flags; 342 343 local_irq_save(flags); 344 sbus_writel(sun4m_imask[SUN4M_PROFILE_IRQ], &sun4m_irq_global->mask_clear); 345 local_irq_restore(flags); 346 } 347 348 void sun4m_clear_profile_irq(int cpu) 349 { 350 sbus_readl(&timers_percpu[cpu]->l14_limit); 351 } 352 353 static void sun4m_load_profile_irq(int cpu, unsigned int limit) 354 { 355 unsigned int value = limit ? timer_value(limit) : 0; 356 sbus_writel(value, &timers_percpu[cpu]->l14_limit); 357 } 358 359 static void __init sun4m_init_timers(void) 360 { 361 struct device_node *dp = of_find_node_by_name(NULL, "counter"); 362 int i, err, len, num_cpu_timers; 363 unsigned int irq; 364 const u32 *addr; 365 366 if (!dp) { 367 printk(KERN_ERR "sun4m_init_timers: No 'counter' node.\n"); 368 return; 369 } 370 371 addr = of_get_property(dp, "address", &len); 372 of_node_put(dp); 373 if (!addr) { 374 printk(KERN_ERR "sun4m_init_timers: No 'address' prop.\n"); 375 return; 376 } 377 378 num_cpu_timers = (len / sizeof(u32)) - 1; 379 for (i = 0; i < num_cpu_timers; i++) { 380 timers_percpu[i] = (void __iomem *) 381 (unsigned long) addr[i]; 382 } 383 timers_global = (void __iomem *) 384 (unsigned long) addr[num_cpu_timers]; 385 386 /* Every per-cpu timer works in timer mode */ 387 sbus_writel(0x00000000, &timers_global->timer_config); 388 389 #ifdef CONFIG_SMP 390 sparc_config.cs_period = SBUS_CLOCK_RATE * 2; /* 2 seconds */ 391 sparc_config.features |= FEAT_L14_ONESHOT; 392 #else 393 sparc_config.cs_period = SBUS_CLOCK_RATE / HZ; /* 1/HZ sec */ 394 sparc_config.features |= FEAT_L10_CLOCKEVENT; 395 #endif 396 sparc_config.features |= FEAT_L10_CLOCKSOURCE; 397 sbus_writel(timer_value(sparc_config.cs_period), 398 &timers_global->l10_limit); 399 400 master_l10_counter = &timers_global->l10_count; 401 402 irq = sun4m_build_device_irq(NULL, SUN4M_TIMER_IRQ); 403 404 err = request_irq(irq, timer_interrupt, IRQF_TIMER, "timer", NULL); 405 if (err) { 406 printk(KERN_ERR "sun4m_init_timers: Register IRQ error %d.\n", 407 err); 408 return; 409 } 410 411 for (i = 0; i < num_cpu_timers; i++) 412 sbus_writel(0, &timers_percpu[i]->l14_limit); 413 if (num_cpu_timers == 4) 414 sbus_writel(SUN4M_INT_E14, &sun4m_irq_global->mask_set); 415 416 #ifdef CONFIG_SMP 417 { 418 unsigned long flags; 419 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)]; 420 421 /* For SMP we use the level 14 ticker, however the bootup code 422 * has copied the firmware's level 14 vector into the boot cpu's 423 * trap table, we must fix this now or we get squashed. 424 */ 425 local_irq_save(flags); 426 trap_table->inst_one = lvl14_save[0]; 427 trap_table->inst_two = lvl14_save[1]; 428 trap_table->inst_three = lvl14_save[2]; 429 trap_table->inst_four = lvl14_save[3]; 430 local_ops->cache_all(); 431 local_irq_restore(flags); 432 } 433 #endif 434 } 435 436 void __init sun4m_init_IRQ(void) 437 { 438 struct device_node *dp = of_find_node_by_name(NULL, "interrupt"); 439 int len, i, mid, num_cpu_iregs; 440 const u32 *addr; 441 442 if (!dp) { 443 printk(KERN_ERR "sun4m_init_IRQ: No 'interrupt' node.\n"); 444 return; 445 } 446 447 addr = of_get_property(dp, "address", &len); 448 of_node_put(dp); 449 if (!addr) { 450 printk(KERN_ERR "sun4m_init_IRQ: No 'address' prop.\n"); 451 return; 452 } 453 454 num_cpu_iregs = (len / sizeof(u32)) - 1; 455 for (i = 0; i < num_cpu_iregs; i++) { 456 sun4m_irq_percpu[i] = (void __iomem *) 457 (unsigned long) addr[i]; 458 } 459 sun4m_irq_global = (void __iomem *) 460 (unsigned long) addr[num_cpu_iregs]; 461 462 local_irq_disable(); 463 464 sbus_writel(~SUN4M_INT_MASKALL, &sun4m_irq_global->mask_set); 465 for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++) 466 sbus_writel(~0x17fff, &sun4m_irq_percpu[mid]->clear); 467 468 if (num_cpu_iregs == 4) 469 sbus_writel(0, &sun4m_irq_global->interrupt_target); 470 471 sparc_config.init_timers = sun4m_init_timers; 472 sparc_config.build_device_irq = sun4m_build_device_irq; 473 sparc_config.clock_rate = SBUS_CLOCK_RATE; 474 sparc_config.clear_clock_irq = sun4m_clear_clock_irq; 475 sparc_config.load_profile_irq = sun4m_load_profile_irq; 476 477 478 /* Cannot enable interrupts until OBP ticker is disabled. */ 479 } 480