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   1 /*
   2  * arch/powerpc/sysdev/qe_lib/qe_ic.c
   3  *
   4  * Copyright (C) 2006 Freescale Semicondutor, Inc.  All rights reserved.
   5  *
   6  * Author: Li Yang <leoli@freescale.com>
   7  * Based on code from Shlomi Gridish <gridish@freescale.com>
   8  *
   9  * QUICC ENGINE Interrupt Controller
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/errno.h>
  20 #include <linux/reboot.h>
  21 #include <linux/slab.h>
  22 #include <linux/stddef.h>
  23 #include <linux/sched.h>
  24 #include <linux/signal.h>
  25 #include <linux/sysdev.h>
  26 #include <linux/device.h>
  27 #include <linux/bootmem.h>
  28 #include <linux/spinlock.h>
  29 #include <asm/irq.h>
  30 #include <asm/io.h>
  31 #include <asm/prom.h>
  32 #include <asm/qe_ic.h>
  33
  34 #include "qe_ic.h"
  35
  36 static DEFINE_SPINLOCK(qe_ic_lock);
  37
  38 static struct qe_ic_info qe_ic_info[] = {
  39         [1] = {
  40                .mask = 0x00008000,
  41                .mask_reg = QEIC_CIMR,
  42                .pri_code = 0,
  43                .pri_reg = QEIC_CIPWCC,
  44                },
  45         [2] = {
  46                .mask = 0x00004000,
  47                .mask_reg = QEIC_CIMR,
  48                .pri_code = 1,
  49                .pri_reg = QEIC_CIPWCC,
  50                },
  51         [3] = {
  52                .mask = 0x00002000,
  53                .mask_reg = QEIC_CIMR,
  54                .pri_code = 2,
  55                .pri_reg = QEIC_CIPWCC,
  56                },
  57         [10] = {
  58                 .mask = 0x00000040,
  59                 .mask_reg = QEIC_CIMR,
  60                 .pri_code = 1,
  61                 .pri_reg = QEIC_CIPZCC,
  62                 },
  63         [11] = {
  64                 .mask = 0x00000020,
  65                 .mask_reg = QEIC_CIMR,
  66                 .pri_code = 2,
  67                 .pri_reg = QEIC_CIPZCC,
  68                 },
  69         [12] = {
  70                 .mask = 0x00000010,
  71                 .mask_reg = QEIC_CIMR,
  72                 .pri_code = 3,
  73                 .pri_reg = QEIC_CIPZCC,
  74                 },
  75         [13] = {
  76                 .mask = 0x00000008,
  77                 .mask_reg = QEIC_CIMR,
  78                 .pri_code = 4,
  79                 .pri_reg = QEIC_CIPZCC,
  80                 },
  81         [14] = {
  82                 .mask = 0x00000004,
  83                 .mask_reg = QEIC_CIMR,
  84                 .pri_code = 5,
  85                 .pri_reg = QEIC_CIPZCC,
  86                 },
  87         [15] = {
  88                 .mask = 0x00000002,
  89                 .mask_reg = QEIC_CIMR,
  90                 .pri_code = 6,
  91                 .pri_reg = QEIC_CIPZCC,
  92                 },
  93         [20] = {
  94                 .mask = 0x10000000,
  95                 .mask_reg = QEIC_CRIMR,
  96                 .pri_code = 3,
  97                 .pri_reg = QEIC_CIPRTA,
  98                 },
  99         [25] = {
 100                 .mask = 0x00800000,
 101                 .mask_reg = QEIC_CRIMR,
 102                 .pri_code = 0,
 103                 .pri_reg = QEIC_CIPRTB,
 104                 },
 105         [26] = {
 106                 .mask = 0x00400000,
 107                 .mask_reg = QEIC_CRIMR,
 108                 .pri_code = 1,
 109                 .pri_reg = QEIC_CIPRTB,
 110                 },
 111         [27] = {
 112                 .mask = 0x00200000,
 113                 .mask_reg = QEIC_CRIMR,
 114                 .pri_code = 2,
 115                 .pri_reg = QEIC_CIPRTB,
 116                 },
 117         [28] = {
 118                 .mask = 0x00100000,
 119                 .mask_reg = QEIC_CRIMR,
 120                 .pri_code = 3,
 121                 .pri_reg = QEIC_CIPRTB,
 122                 },
 123         [32] = {
 124                 .mask = 0x80000000,
 125                 .mask_reg = QEIC_CIMR,
 126                 .pri_code = 0,
 127                 .pri_reg = QEIC_CIPXCC,
 128                 },
 129         [33] = {
 130                 .mask = 0x40000000,
 131                 .mask_reg = QEIC_CIMR,
 132                 .pri_code = 1,
 133                 .pri_reg = QEIC_CIPXCC,
 134                 },
 135         [34] = {
 136                 .mask = 0x20000000,
 137                 .mask_reg = QEIC_CIMR,
 138                 .pri_code = 2,
 139                 .pri_reg = QEIC_CIPXCC,
 140                 },
 141         [35] = {
 142                 .mask = 0x10000000,
 143                 .mask_reg = QEIC_CIMR,
 144                 .pri_code = 3,
 145                 .pri_reg = QEIC_CIPXCC,
 146                 },
 147         [36] = {
 148                 .mask = 0x08000000,
 149                 .mask_reg = QEIC_CIMR,
 150                 .pri_code = 4,
 151                 .pri_reg = QEIC_CIPXCC,
 152                 },
 153         [40] = {
 154                 .mask = 0x00800000,
 155                 .mask_reg = QEIC_CIMR,
 156                 .pri_code = 0,
 157                 .pri_reg = QEIC_CIPYCC,
 158                 },
 159         [41] = {
 160                 .mask = 0x00400000,
 161                 .mask_reg = QEIC_CIMR,
 162                 .pri_code = 1,
 163                 .pri_reg = QEIC_CIPYCC,
 164                 },
 165         [42] = {
 166                 .mask = 0x00200000,
 167                 .mask_reg = QEIC_CIMR,
 168                 .pri_code = 2,
 169                 .pri_reg = QEIC_CIPYCC,
 170                 },
 171         [43] = {
 172                 .mask = 0x00100000,
 173                 .mask_reg = QEIC_CIMR,
 174                 .pri_code = 3,
 175                 .pri_reg = QEIC_CIPYCC,
 176                 },
 177 };
 178
 179 static inline u32 qe_ic_read(volatile __be32  __iomem * base, unsigned int reg)
 180 {
 181         return in_be32(base + (reg >> 2));
 182 }
 183
 184 static inline void qe_ic_write(volatile __be32  __iomem * base, unsigned int reg,
 185                                u32 value)
 186 {
 187         out_be32(base + (reg >> 2), value);
 188 }
 189
 190 static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
 191 {
 192         return irq_desc[virq].chip_data;
 193 }
 194
 195 #define virq_to_hw(virq)        ((unsigned int)irq_map[virq].hwirq)
 196
 197 static void qe_ic_unmask_irq(unsigned int virq)
 198 {
 199         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 200         unsigned int src = virq_to_hw(virq);
 201         unsigned long flags;
 202         u32 temp;
 203
 204         spin_lock_irqsave(&qe_ic_lock, flags);
 205
 206         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
 207         qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
 208                     temp | qe_ic_info[src].mask);
 209
 210         spin_unlock_irqrestore(&qe_ic_lock, flags);
 211 }
 212
 213 static void qe_ic_mask_irq(unsigned int virq)
 214 {
 215         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 216         unsigned int src = virq_to_hw(virq);
 217         unsigned long flags;
 218         u32 temp;
 219
 220         spin_lock_irqsave(&qe_ic_lock, flags);
 221
 222         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
 223         qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
 224                     temp & ~qe_ic_info[src].mask);
 225
 226         /* Flush the above write before enabling interrupts; otherwise,
 227          * spurious interrupts will sometimes happen.  To be 100% sure
 228          * that the write has reached the device before interrupts are
 229          * enabled, the mask register would have to be read back; however,
 230          * this is not required for correctness, only to avoid wasting
 231          * time on a large number of spurious interrupts.  In testing,
 232          * a sync reduced the observed spurious interrupts to zero.
 233          */
 234         mb();
 235
 236         spin_unlock_irqrestore(&qe_ic_lock, flags);
 237 }
 238
 239 static struct irq_chip qe_ic_irq_chip = {
 240         .typename = " QEIC  ",
 241         .unmask = qe_ic_unmask_irq,
 242         .mask = qe_ic_mask_irq,
 243         .mask_ack = qe_ic_mask_irq,
 244 };
 245
 246 static int qe_ic_host_match(struct irq_host *h, struct device_node *node)
 247 {
 248         struct qe_ic *qe_ic = h->host_data;
 249
 250         /* Exact match, unless qe_ic node is NULL */
 251         return qe_ic->of_node == NULL || qe_ic->of_node == node;
 252 }
 253
 254 static int qe_ic_host_map(struct irq_host *h, unsigned int virq,
 255                           irq_hw_number_t hw)
 256 {
 257         struct qe_ic *qe_ic = h->host_data;
 258         struct irq_chip *chip;
 259
 260         if (qe_ic_info[hw].mask == 0) {
 261                 printk(KERN_ERR "Can't map reserved IRQ \n");
 262                 return -EINVAL;
 263         }
 264         /* Default chip */
 265         chip = &qe_ic->hc_irq;
 266
 267         set_irq_chip_data(virq, qe_ic);
 268         get_irq_desc(virq)->status |= IRQ_LEVEL;
 269
 270         set_irq_chip_and_handler(virq, chip, handle_level_irq);
 271
 272         return 0;
 273 }
 274
 275 static int qe_ic_host_xlate(struct irq_host *h, struct device_node *ct,
 276                             u32 * intspec, unsigned int intsize,
 277                             irq_hw_number_t * out_hwirq,
 278                             unsigned int *out_flags)
 279 {
 280         *out_hwirq = intspec[0];
 281         if (intsize > 1)
 282                 *out_flags = intspec[1];
 283         else
 284                 *out_flags = IRQ_TYPE_NONE;
 285         return 0;
 286 }
 287
 288 static struct irq_host_ops qe_ic_host_ops = {
 289         .match = qe_ic_host_match,
 290         .map = qe_ic_host_map,
 291         .xlate = qe_ic_host_xlate,
 292 };
 293
 294 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 295 unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
 296 {
 297         int irq;
 298
 299         BUG_ON(qe_ic == NULL);
 300
 301         /* get the interrupt source vector. */
 302         irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;
 303
 304         if (irq == 0)
 305                 return NO_IRQ;
 306
 307         return irq_linear_revmap(qe_ic->irqhost, irq);
 308 }
 309
 310 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 311 unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
 312 {
 313         int irq;
 314
 315         BUG_ON(qe_ic == NULL);
 316
 317         /* get the interrupt source vector. */
 318         irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;
 319
 320         if (irq == 0)
 321                 return NO_IRQ;
 322
 323         return irq_linear_revmap(qe_ic->irqhost, irq);
 324 }
 325
 326 void fastcall qe_ic_cascade_low(unsigned int irq, struct irq_desc *desc)
 327 {
 328         struct qe_ic *qe_ic = desc->handler_data;
 329         unsigned int cascade_irq = qe_ic_get_low_irq(qe_ic);
 330
 331         if (cascade_irq != NO_IRQ)
 332                 generic_handle_irq(cascade_irq);
 333 }
 334
 335 void fastcall qe_ic_cascade_high(unsigned int irq, struct irq_desc *desc)
 336 {
 337         struct qe_ic *qe_ic = desc->handler_data;
 338         unsigned int cascade_irq = qe_ic_get_high_irq(qe_ic);
 339
 340         if (cascade_irq != NO_IRQ)
 341                 generic_handle_irq(cascade_irq);
 342 }
 343
 344 void __init qe_ic_init(struct device_node *node, unsigned int flags)
 345 {
 346         struct qe_ic *qe_ic;
 347         struct resource res;
 348         u32 temp = 0, ret, high_active = 0;
 349
 350         qe_ic = alloc_bootmem(sizeof(struct qe_ic));
 351         if (qe_ic == NULL)
 352                 return;
 353
 354         memset(qe_ic, 0, sizeof(struct qe_ic));
 355         qe_ic->of_node = node ? of_node_get(node) : NULL;
 356
 357         qe_ic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
 358                                         NR_QE_IC_INTS, &qe_ic_host_ops, 0);
 359         if (qe_ic->irqhost == NULL) {
 360                 of_node_put(node);
 361                 return;
 362         }
 363
 364         ret = of_address_to_resource(node, 0, &res);
 365         if (ret)
 366                 return;
 367
 368         qe_ic->regs = ioremap(res.start, res.end - res.start + 1);
 369
 370         qe_ic->irqhost->host_data = qe_ic;
 371         qe_ic->hc_irq = qe_ic_irq_chip;
 372
 373         qe_ic->virq_high = irq_of_parse_and_map(node, 0);
 374         qe_ic->virq_low = irq_of_parse_and_map(node, 1);
 375
 376         if (qe_ic->virq_low == NO_IRQ) {
 377                 printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
 378                 return;
 379         }
 380
 381         /* default priority scheme is grouped. If spread mode is    */
 382         /* required, configure cicr accordingly.                    */
 383         if (flags & QE_IC_SPREADMODE_GRP_W)
 384                 temp |= CICR_GWCC;
 385         if (flags & QE_IC_SPREADMODE_GRP_X)
 386                 temp |= CICR_GXCC;
 387         if (flags & QE_IC_SPREADMODE_GRP_Y)
 388                 temp |= CICR_GYCC;
 389         if (flags & QE_IC_SPREADMODE_GRP_Z)
 390                 temp |= CICR_GZCC;
 391         if (flags & QE_IC_SPREADMODE_GRP_RISCA)
 392                 temp |= CICR_GRTA;
 393         if (flags & QE_IC_SPREADMODE_GRP_RISCB)
 394                 temp |= CICR_GRTB;
 395
 396         /* choose destination signal for highest priority interrupt */
 397         if (flags & QE_IC_HIGH_SIGNAL) {
 398                 temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
 399                 high_active = 1;
 400         }
 401
 402         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 403
 404         set_irq_data(qe_ic->virq_low, qe_ic);
 405         set_irq_chained_handler(qe_ic->virq_low, qe_ic_cascade_low);
 406
 407         if (qe_ic->virq_high != NO_IRQ) {
 408                 set_irq_data(qe_ic->virq_high, qe_ic);
 409                 set_irq_chained_handler(qe_ic->virq_high, qe_ic_cascade_high);
 410         }
 411
 412         printk("QEIC (%d IRQ sources) at %p\n", NR_QE_IC_INTS, qe_ic->regs);
 413 }
 414
 415 void qe_ic_set_highest_priority(unsigned int virq, int high)
 416 {
 417         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 418         unsigned int src = virq_to_hw(virq);
 419         u32 temp = 0;
 420
 421         temp = qe_ic_read(qe_ic->regs, QEIC_CICR);
 422
 423         temp &= ~CICR_HP_MASK;
 424         temp |= src << CICR_HP_SHIFT;
 425
 426         temp &= ~CICR_HPIT_MASK;
 427         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;
 428
 429         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 430 }
 431
 432 /* Set Priority level within its group, from 1 to 8 */
 433 int qe_ic_set_priority(unsigned int virq, unsigned int priority)
 434 {
 435         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 436         unsigned int src = virq_to_hw(virq);
 437         u32 temp;
 438
 439         if (priority > 8 || priority == 0)
 440                 return -EINVAL;
 441         if (src > 127)
 442                 return -EINVAL;
 443         if (qe_ic_info[src].pri_reg == 0)
 444                 return -EINVAL;
 445
 446         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);
 447
 448         if (priority < 4) {
 449                 temp &= ~(0x7 << (32 - priority * 3));
 450                 temp |= qe_ic_info[src].pri_code << (32 - priority * 3);
 451         } else {
 452                 temp &= ~(0x7 << (24 - priority * 3));
 453                 temp |= qe_ic_info[src].pri_code << (24 - priority * 3);
 454         }
 455
 456         qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);
 457
 458         return 0;
 459 }
 460
 461 /* Set a QE priority to use high irq, only priority 1~2 can use high irq */
 462 int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
 463 {
 464         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 465         unsigned int src = virq_to_hw(virq);
 466         u32 temp, control_reg = QEIC_CICNR, shift = 0;
 467
 468         if (priority > 2 || priority == 0)
 469                 return -EINVAL;
 470
 471         switch (qe_ic_info[src].pri_reg) {
 472         case QEIC_CIPZCC:
 473                 shift = CICNR_ZCC1T_SHIFT;
 474                 break;
 475         case QEIC_CIPWCC:
 476                 shift = CICNR_WCC1T_SHIFT;
 477                 break;
 478         case QEIC_CIPYCC:
 479                 shift = CICNR_YCC1T_SHIFT;
 480                 break;
 481         case QEIC_CIPXCC:
 482                 shift = CICNR_XCC1T_SHIFT;
 483                 break;
 484         case QEIC_CIPRTA:
 485                 shift = CRICR_RTA1T_SHIFT;
 486                 control_reg = QEIC_CRICR;
 487                 break;
 488         case QEIC_CIPRTB:
 489                 shift = CRICR_RTB1T_SHIFT;
 490                 control_reg = QEIC_CRICR;
 491                 break;
 492         default:
 493                 return -EINVAL;
 494         }
 495
 496         shift += (2 - priority) * 2;
 497         temp = qe_ic_read(qe_ic->regs, control_reg);
 498         temp &= ~(SIGNAL_MASK << shift);
 499         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
 500         qe_ic_write(qe_ic->regs, control_reg, temp);
 501
 502         return 0;
 503 }
 504
 505 static struct sysdev_class qe_ic_sysclass = {
 506         set_kset_name("qe_ic"),
 507 };
 508
 509 static struct sys_device device_qe_ic = {
 510         .id = 0,
 511         .cls = &qe_ic_sysclass,
 512 };
 513
 514 static int __init init_qe_ic_sysfs(void)
 515 {
 516         int rc;
 517
 518         printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");
 519
 520         rc = sysdev_class_register(&qe_ic_sysclass);
 521         if (rc) {
 522                 printk(KERN_ERR "Failed registering qe_ic sys class\n");
 523                 return -ENODEV;
 524         }
 525         rc = sysdev_register(&device_qe_ic);
 526         if (rc) {
 527                 printk(KERN_ERR "Failed registering qe_ic sys device\n");
 528                 return -ENODEV;
 529         }
 530         return 0;
 531 }
 532
 533 subsys_initcall(init_qe_ic_sysfs);