arch/powerpc/sysdev/qe_lib/qe_ic.c

   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_RAW_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_get_chip_data(virq);
 193 }
 194
 195 static inline struct qe_ic *qe_ic_from_irq_data(struct irq_data *d)
 196 {
 197         return irq_data_get_irq_chip_data(d);
 198 }
 199
 200 static void qe_ic_unmask_irq(struct irq_data *d)
 201 {
 202         struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
 203         unsigned int src = irqd_to_hwirq(d);
 204         unsigned long flags;
 205         u32 temp;
 206
 207         raw_spin_lock_irqsave(&qe_ic_lock, flags);
 208
 209         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
 210         qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
 211                     temp | qe_ic_info[src].mask);
 212
 213         raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
 214 }
 215
 216 static void qe_ic_mask_irq(struct irq_data *d)
 217 {
 218         struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
 219         unsigned int src = irqd_to_hwirq(d);
 220         unsigned long flags;
 221         u32 temp;
 222
 223         raw_spin_lock_irqsave(&qe_ic_lock, flags);
 224
 225         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
 226         qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
 227                     temp & ~qe_ic_info[src].mask);
 228
 229         /* Flush the above write before enabling interrupts; otherwise,
 230          * spurious interrupts will sometimes happen.  To be 100% sure
 231          * that the write has reached the device before interrupts are
 232          * enabled, the mask register would have to be read back; however,
 233          * this is not required for correctness, only to avoid wasting
 234          * time on a large number of spurious interrupts.  In testing,
 235          * a sync reduced the observed spurious interrupts to zero.
 236          */
 237         mb();
 238
 239         raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
 240 }
 241
 242 static struct irq_chip qe_ic_irq_chip = {
 243         .name = "QEIC",
 244         .irq_unmask = qe_ic_unmask_irq,
 245         .irq_mask = qe_ic_mask_irq,
 246         .irq_mask_ack = qe_ic_mask_irq,
 247 };
 248
 249 static int qe_ic_host_match(struct irq_host *h, struct device_node *node)
 250 {
 251         /* Exact match, unless qe_ic node is NULL */
 252         return h->of_node == NULL || h->of_node == node;
 253 }
 254
 255 static int qe_ic_host_map(struct irq_host *h, unsigned int virq,
 256                           irq_hw_number_t hw)
 257 {
 258         struct qe_ic *qe_ic = h->host_data;
 259         struct irq_chip *chip;
 260
 261         if (qe_ic_info[hw].mask == 0) {
 262                 printk(KERN_ERR "Can't map reserved IRQ\n");
 263                 return -EINVAL;
 264         }
 265         /* Default chip */
 266         chip = &qe_ic->hc_irq;
 267
 268         irq_set_chip_data(virq, qe_ic);
 269         irq_set_status_flags(virq, IRQ_LEVEL);
 270
 271         irq_set_chip_and_handler(virq, chip, handle_level_irq);
 272
 273         return 0;
 274 }
 275
 276 static int qe_ic_host_xlate(struct irq_host *h, struct device_node *ct,
 277                             const u32 * intspec, unsigned int intsize,
 278                             irq_hw_number_t * out_hwirq,
 279                             unsigned int *out_flags)
 280 {
 281         *out_hwirq = intspec[0];
 282         if (intsize > 1)
 283                 *out_flags = intspec[1];
 284         else
 285                 *out_flags = IRQ_TYPE_NONE;
 286         return 0;
 287 }
 288
 289 static struct irq_host_ops qe_ic_host_ops = {
 290         .match = qe_ic_host_match,
 291         .map = qe_ic_host_map,
 292         .xlate = qe_ic_host_xlate,
 293 };
 294
 295 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 296 unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
 297 {
 298         int irq;
 299
 300         BUG_ON(qe_ic == NULL);
 301
 302         /* get the interrupt source vector. */
 303         irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;
 304
 305         if (irq == 0)
 306                 return NO_IRQ;
 307
 308         return irq_linear_revmap(qe_ic->irqhost, irq);
 309 }
 310
 311 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 312 unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
 313 {
 314         int irq;
 315
 316         BUG_ON(qe_ic == NULL);
 317
 318         /* get the interrupt source vector. */
 319         irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;
 320
 321         if (irq == 0)
 322                 return NO_IRQ;
 323
 324         return irq_linear_revmap(qe_ic->irqhost, irq);
 325 }
 326
 327 void __init qe_ic_init(struct device_node *node, unsigned int flags,
 328                 void (*low_handler)(unsigned int irq, struct irq_desc *desc),
 329                 void (*high_handler)(unsigned int irq, struct irq_desc *desc))
 330 {
 331         struct qe_ic *qe_ic;
 332         struct resource res;
 333         u32 temp = 0, ret, high_active = 0;
 334
 335         ret = of_address_to_resource(node, 0, &res);
 336         if (ret)
 337                 return;
 338
 339         qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
 340         if (qe_ic == NULL)
 341                 return;
 342
 343         qe_ic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 344                                         NR_QE_IC_INTS, &qe_ic_host_ops, 0);
 345         if (qe_ic->irqhost == NULL) {
 346                 kfree(qe_ic);
 347                 return;
 348         }
 349
 350         qe_ic->regs = ioremap(res.start, res.end - res.start + 1);
 351
 352         qe_ic->irqhost->host_data = qe_ic;
 353         qe_ic->hc_irq = qe_ic_irq_chip;
 354
 355         qe_ic->virq_high = irq_of_parse_and_map(node, 0);
 356         qe_ic->virq_low = irq_of_parse_and_map(node, 1);
 357
 358         if (qe_ic->virq_low == NO_IRQ) {
 359                 printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
 360                 kfree(qe_ic);
 361                 return;
 362         }
 363
 364         /* default priority scheme is grouped. If spread mode is    */
 365         /* required, configure cicr accordingly.                    */
 366         if (flags & QE_IC_SPREADMODE_GRP_W)
 367                 temp |= CICR_GWCC;
 368         if (flags & QE_IC_SPREADMODE_GRP_X)
 369                 temp |= CICR_GXCC;
 370         if (flags & QE_IC_SPREADMODE_GRP_Y)
 371                 temp |= CICR_GYCC;
 372         if (flags & QE_IC_SPREADMODE_GRP_Z)
 373                 temp |= CICR_GZCC;
 374         if (flags & QE_IC_SPREADMODE_GRP_RISCA)
 375                 temp |= CICR_GRTA;
 376         if (flags & QE_IC_SPREADMODE_GRP_RISCB)
 377                 temp |= CICR_GRTB;
 378
 379         /* choose destination signal for highest priority interrupt */
 380         if (flags & QE_IC_HIGH_SIGNAL) {
 381                 temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
 382                 high_active = 1;
 383         }
 384
 385         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 386
 387         irq_set_handler_data(qe_ic->virq_low, qe_ic);
 388         irq_set_chained_handler(qe_ic->virq_low, low_handler);
 389
 390         if (qe_ic->virq_high != NO_IRQ &&
 391                         qe_ic->virq_high != qe_ic->virq_low) {
 392                 irq_set_handler_data(qe_ic->virq_high, qe_ic);
 393                 irq_set_chained_handler(qe_ic->virq_high, high_handler);
 394         }
 395 }
 396
 397 void qe_ic_set_highest_priority(unsigned int virq, int high)
 398 {
 399         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 400         unsigned int src = virq_to_hw(virq);
 401         u32 temp = 0;
 402
 403         temp = qe_ic_read(qe_ic->regs, QEIC_CICR);
 404
 405         temp &= ~CICR_HP_MASK;
 406         temp |= src << CICR_HP_SHIFT;
 407
 408         temp &= ~CICR_HPIT_MASK;
 409         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;
 410
 411         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 412 }
 413
 414 /* Set Priority level within its group, from 1 to 8 */
 415 int qe_ic_set_priority(unsigned int virq, unsigned int priority)
 416 {
 417         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 418         unsigned int src = virq_to_hw(virq);
 419         u32 temp;
 420
 421         if (priority > 8 || priority == 0)
 422                 return -EINVAL;
 423         if (src > 127)
 424                 return -EINVAL;
 425         if (qe_ic_info[src].pri_reg == 0)
 426                 return -EINVAL;
 427
 428         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);
 429
 430         if (priority < 4) {
 431                 temp &= ~(0x7 << (32 - priority * 3));
 432                 temp |= qe_ic_info[src].pri_code << (32 - priority * 3);
 433         } else {
 434                 temp &= ~(0x7 << (24 - priority * 3));
 435                 temp |= qe_ic_info[src].pri_code << (24 - priority * 3);
 436         }
 437
 438         qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);
 439
 440         return 0;
 441 }
 442
 443 /* Set a QE priority to use high irq, only priority 1~2 can use high irq */
 444 int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
 445 {
 446         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 447         unsigned int src = virq_to_hw(virq);
 448         u32 temp, control_reg = QEIC_CICNR, shift = 0;
 449
 450         if (priority > 2 || priority == 0)
 451                 return -EINVAL;
 452
 453         switch (qe_ic_info[src].pri_reg) {
 454         case QEIC_CIPZCC:
 455                 shift = CICNR_ZCC1T_SHIFT;
 456                 break;
 457         case QEIC_CIPWCC:
 458                 shift = CICNR_WCC1T_SHIFT;
 459                 break;
 460         case QEIC_CIPYCC:
 461                 shift = CICNR_YCC1T_SHIFT;
 462                 break;
 463         case QEIC_CIPXCC:
 464                 shift = CICNR_XCC1T_SHIFT;
 465                 break;
 466         case QEIC_CIPRTA:
 467                 shift = CRICR_RTA1T_SHIFT;
 468                 control_reg = QEIC_CRICR;
 469                 break;
 470         case QEIC_CIPRTB:
 471                 shift = CRICR_RTB1T_SHIFT;
 472                 control_reg = QEIC_CRICR;
 473                 break;
 474         default:
 475                 return -EINVAL;
 476         }
 477
 478         shift += (2 - priority) * 2;
 479         temp = qe_ic_read(qe_ic->regs, control_reg);
 480         temp &= ~(SIGNAL_MASK << shift);
 481         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
 482         qe_ic_write(qe_ic->regs, control_reg, temp);
 483
 484         return 0;
 485 }
 486
 487 static struct sysdev_class qe_ic_sysclass = {
 488         .name = "qe_ic",
 489 };
 490
 491 static struct sys_device device_qe_ic = {
 492         .id = 0,
 493         .cls = &qe_ic_sysclass,
 494 };
 495
 496 static int __init init_qe_ic_sysfs(void)
 497 {
 498         int rc;
 499
 500         printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");
 501
 502         rc = sysdev_class_register(&qe_ic_sysclass);
 503         if (rc) {
 504                 printk(KERN_ERR "Failed registering qe_ic sys class\n");
 505                 return -ENODEV;
 506         }
 507         rc = sysdev_register(&device_qe_ic);
 508         if (rc) {
 509                 printk(KERN_ERR "Failed registering qe_ic sys device\n");
 510                 return -ENODEV;
 511         }
 512         return 0;
 513 }
 514
 515 subsys_initcall(init_qe_ic_sysfs);