arch/powerpc/sysdev/qe_lib/qe_ic.c

   1 /*
   2  * arch/powerpc/sysdev/qe_lib/qe_ic.c
   3  *
   4  * Copyright (C) 2006 Freescale Semiconductor, 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/device.h>
  26 #include <linux/bootmem.h>
  27 #include <linux/spinlock.h>
  28 #include <asm/irq.h>
  29 #include <asm/io.h>
  30 #include <asm/prom.h>
  31 #include <asm/qe_ic.h>
  32
  33 #include "qe_ic.h"
  34
  35 static DEFINE_RAW_SPINLOCK(qe_ic_lock);
  36
  37 static struct qe_ic_info qe_ic_info[] = {
  38         [1] = {
  39                .mask = 0x00008000,
  40                .mask_reg = QEIC_CIMR,
  41                .pri_code = 0,
  42                .pri_reg = QEIC_CIPWCC,
  43                },
  44         [2] = {
  45                .mask = 0x00004000,
  46                .mask_reg = QEIC_CIMR,
  47                .pri_code = 1,
  48                .pri_reg = QEIC_CIPWCC,
  49                },
  50         [3] = {
  51                .mask = 0x00002000,
  52                .mask_reg = QEIC_CIMR,
  53                .pri_code = 2,
  54                .pri_reg = QEIC_CIPWCC,
  55                },
  56         [10] = {
  57                 .mask = 0x00000040,
  58                 .mask_reg = QEIC_CIMR,
  59                 .pri_code = 1,
  60                 .pri_reg = QEIC_CIPZCC,
  61                 },
  62         [11] = {
  63                 .mask = 0x00000020,
  64                 .mask_reg = QEIC_CIMR,
  65                 .pri_code = 2,
  66                 .pri_reg = QEIC_CIPZCC,
  67                 },
  68         [12] = {
  69                 .mask = 0x00000010,
  70                 .mask_reg = QEIC_CIMR,
  71                 .pri_code = 3,
  72                 .pri_reg = QEIC_CIPZCC,
  73                 },
  74         [13] = {
  75                 .mask = 0x00000008,
  76                 .mask_reg = QEIC_CIMR,
  77                 .pri_code = 4,
  78                 .pri_reg = QEIC_CIPZCC,
  79                 },
  80         [14] = {
  81                 .mask = 0x00000004,
  82                 .mask_reg = QEIC_CIMR,
  83                 .pri_code = 5,
  84                 .pri_reg = QEIC_CIPZCC,
  85                 },
  86         [15] = {
  87                 .mask = 0x00000002,
  88                 .mask_reg = QEIC_CIMR,
  89                 .pri_code = 6,
  90                 .pri_reg = QEIC_CIPZCC,
  91                 },
  92         [20] = {
  93                 .mask = 0x10000000,
  94                 .mask_reg = QEIC_CRIMR,
  95                 .pri_code = 3,
  96                 .pri_reg = QEIC_CIPRTA,
  97                 },
  98         [25] = {
  99                 .mask = 0x00800000,
 100                 .mask_reg = QEIC_CRIMR,
 101                 .pri_code = 0,
 102                 .pri_reg = QEIC_CIPRTB,
 103                 },
 104         [26] = {
 105                 .mask = 0x00400000,
 106                 .mask_reg = QEIC_CRIMR,
 107                 .pri_code = 1,
 108                 .pri_reg = QEIC_CIPRTB,
 109                 },
 110         [27] = {
 111                 .mask = 0x00200000,
 112                 .mask_reg = QEIC_CRIMR,
 113                 .pri_code = 2,
 114                 .pri_reg = QEIC_CIPRTB,
 115                 },
 116         [28] = {
 117                 .mask = 0x00100000,
 118                 .mask_reg = QEIC_CRIMR,
 119                 .pri_code = 3,
 120                 .pri_reg = QEIC_CIPRTB,
 121                 },
 122         [32] = {
 123                 .mask = 0x80000000,
 124                 .mask_reg = QEIC_CIMR,
 125                 .pri_code = 0,
 126                 .pri_reg = QEIC_CIPXCC,
 127                 },
 128         [33] = {
 129                 .mask = 0x40000000,
 130                 .mask_reg = QEIC_CIMR,
 131                 .pri_code = 1,
 132                 .pri_reg = QEIC_CIPXCC,
 133                 },
 134         [34] = {
 135                 .mask = 0x20000000,
 136                 .mask_reg = QEIC_CIMR,
 137                 .pri_code = 2,
 138                 .pri_reg = QEIC_CIPXCC,
 139                 },
 140         [35] = {
 141                 .mask = 0x10000000,
 142                 .mask_reg = QEIC_CIMR,
 143                 .pri_code = 3,
 144                 .pri_reg = QEIC_CIPXCC,
 145                 },
 146         [36] = {
 147                 .mask = 0x08000000,
 148                 .mask_reg = QEIC_CIMR,
 149                 .pri_code = 4,
 150                 .pri_reg = QEIC_CIPXCC,
 151                 },
 152         [40] = {
 153                 .mask = 0x00800000,
 154                 .mask_reg = QEIC_CIMR,
 155                 .pri_code = 0,
 156                 .pri_reg = QEIC_CIPYCC,
 157                 },
 158         [41] = {
 159                 .mask = 0x00400000,
 160                 .mask_reg = QEIC_CIMR,
 161                 .pri_code = 1,
 162                 .pri_reg = QEIC_CIPYCC,
 163                 },
 164         [42] = {
 165                 .mask = 0x00200000,
 166                 .mask_reg = QEIC_CIMR,
 167                 .pri_code = 2,
 168                 .pri_reg = QEIC_CIPYCC,
 169                 },
 170         [43] = {
 171                 .mask = 0x00100000,
 172                 .mask_reg = QEIC_CIMR,
 173                 .pri_code = 3,
 174                 .pri_reg = QEIC_CIPYCC,
 175                 },
 176 };
 177
 178 static inline u32 qe_ic_read(volatile __be32  __iomem * base, unsigned int reg)
 179 {
 180         return in_be32(base + (reg >> 2));
 181 }
 182
 183 static inline void qe_ic_write(volatile __be32  __iomem * base, unsigned int reg,
 184                                u32 value)
 185 {
 186         out_be32(base + (reg >> 2), value);
 187 }
 188
 189 static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
 190 {
 191         return irq_get_chip_data(virq);
 192 }
 193
 194 static inline struct qe_ic *qe_ic_from_irq_data(struct irq_data *d)
 195 {
 196         return irq_data_get_irq_chip_data(d);
 197 }
 198
 199 static void qe_ic_unmask_irq(struct irq_data *d)
 200 {
 201         struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
 202         unsigned int src = irqd_to_hwirq(d);
 203         unsigned long flags;
 204         u32 temp;
 205
 206         raw_spin_lock_irqsave(&qe_ic_lock, flags);
 207
 208         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
 209         qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
 210                     temp | qe_ic_info[src].mask);
 211
 212         raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
 213 }
 214
 215 static void qe_ic_mask_irq(struct irq_data *d)
 216 {
 217         struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
 218         unsigned int src = irqd_to_hwirq(d);
 219         unsigned long flags;
 220         u32 temp;
 221
 222         raw_spin_lock_irqsave(&qe_ic_lock, flags);
 223
 224         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
 225         qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
 226                     temp & ~qe_ic_info[src].mask);
 227
 228         /* Flush the above write before enabling interrupts; otherwise,
 229          * spurious interrupts will sometimes happen.  To be 100% sure
 230          * that the write has reached the device before interrupts are
 231          * enabled, the mask register would have to be read back; however,
 232          * this is not required for correctness, only to avoid wasting
 233          * time on a large number of spurious interrupts.  In testing,
 234          * a sync reduced the observed spurious interrupts to zero.
 235          */
 236         mb();
 237
 238         raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
 239 }
 240
 241 static struct irq_chip qe_ic_irq_chip = {
 242         .name = "QEIC",
 243         .irq_unmask = qe_ic_unmask_irq,
 244         .irq_mask = qe_ic_mask_irq,
 245         .irq_mask_ack = qe_ic_mask_irq,
 246 };
 247
 248 static int qe_ic_host_match(struct irq_domain *h, struct device_node *node)
 249 {
 250         /* Exact match, unless qe_ic node is NULL */
 251         return h->of_node == NULL || h->of_node == node;
 252 }
 253
 254 static int qe_ic_host_map(struct irq_domain *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         irq_set_chip_data(virq, qe_ic);
 268         irq_set_status_flags(virq, IRQ_LEVEL);
 269
 270         irq_set_chip_and_handler(virq, chip, handle_level_irq);
 271
 272         return 0;
 273 }
 274
 275 static struct irq_domain_ops qe_ic_host_ops = {
 276         .match = qe_ic_host_match,
 277         .map = qe_ic_host_map,
 278         .xlate = irq_domain_xlate_onetwocell,
 279 };
 280
 281 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 282 unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
 283 {
 284         int irq;
 285
 286         BUG_ON(qe_ic == NULL);
 287
 288         /* get the interrupt source vector. */
 289         irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;
 290
 291         if (irq == 0)
 292                 return NO_IRQ;
 293
 294         return irq_linear_revmap(qe_ic->irqhost, irq);
 295 }
 296
 297 /* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
 298 unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
 299 {
 300         int irq;
 301
 302         BUG_ON(qe_ic == NULL);
 303
 304         /* get the interrupt source vector. */
 305         irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;
 306
 307         if (irq == 0)
 308                 return NO_IRQ;
 309
 310         return irq_linear_revmap(qe_ic->irqhost, irq);
 311 }
 312
 313 void __init qe_ic_init(struct device_node *node, unsigned int flags,
 314                 void (*low_handler)(unsigned int irq, struct irq_desc *desc),
 315                 void (*high_handler)(unsigned int irq, struct irq_desc *desc))
 316 {
 317         struct qe_ic *qe_ic;
 318         struct resource res;
 319         u32 temp = 0, ret, high_active = 0;
 320
 321         ret = of_address_to_resource(node, 0, &res);
 322         if (ret)
 323                 return;
 324
 325         qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
 326         if (qe_ic == NULL)
 327                 return;
 328
 329         qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
 330                                                &qe_ic_host_ops, qe_ic);
 331         if (qe_ic->irqhost == NULL) {
 332                 kfree(qe_ic);
 333                 return;
 334         }
 335
 336         qe_ic->regs = ioremap(res.start, resource_size(&res));
 337
 338         qe_ic->hc_irq = qe_ic_irq_chip;
 339
 340         qe_ic->virq_high = irq_of_parse_and_map(node, 0);
 341         qe_ic->virq_low = irq_of_parse_and_map(node, 1);
 342
 343         if (qe_ic->virq_low == NO_IRQ) {
 344                 printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
 345                 kfree(qe_ic);
 346                 return;
 347         }
 348
 349         /* default priority scheme is grouped. If spread mode is    */
 350         /* required, configure cicr accordingly.                    */
 351         if (flags & QE_IC_SPREADMODE_GRP_W)
 352                 temp |= CICR_GWCC;
 353         if (flags & QE_IC_SPREADMODE_GRP_X)
 354                 temp |= CICR_GXCC;
 355         if (flags & QE_IC_SPREADMODE_GRP_Y)
 356                 temp |= CICR_GYCC;
 357         if (flags & QE_IC_SPREADMODE_GRP_Z)
 358                 temp |= CICR_GZCC;
 359         if (flags & QE_IC_SPREADMODE_GRP_RISCA)
 360                 temp |= CICR_GRTA;
 361         if (flags & QE_IC_SPREADMODE_GRP_RISCB)
 362                 temp |= CICR_GRTB;
 363
 364         /* choose destination signal for highest priority interrupt */
 365         if (flags & QE_IC_HIGH_SIGNAL) {
 366                 temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
 367                 high_active = 1;
 368         }
 369
 370         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 371
 372         irq_set_handler_data(qe_ic->virq_low, qe_ic);
 373         irq_set_chained_handler(qe_ic->virq_low, low_handler);
 374
 375         if (qe_ic->virq_high != NO_IRQ &&
 376                         qe_ic->virq_high != qe_ic->virq_low) {
 377                 irq_set_handler_data(qe_ic->virq_high, qe_ic);
 378                 irq_set_chained_handler(qe_ic->virq_high, high_handler);
 379         }
 380 }
 381
 382 void qe_ic_set_highest_priority(unsigned int virq, int high)
 383 {
 384         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 385         unsigned int src = virq_to_hw(virq);
 386         u32 temp = 0;
 387
 388         temp = qe_ic_read(qe_ic->regs, QEIC_CICR);
 389
 390         temp &= ~CICR_HP_MASK;
 391         temp |= src << CICR_HP_SHIFT;
 392
 393         temp &= ~CICR_HPIT_MASK;
 394         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;
 395
 396         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 397 }
 398
 399 /* Set Priority level within its group, from 1 to 8 */
 400 int qe_ic_set_priority(unsigned int virq, unsigned int priority)
 401 {
 402         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 403         unsigned int src = virq_to_hw(virq);
 404         u32 temp;
 405
 406         if (priority > 8 || priority == 0)
 407                 return -EINVAL;
 408         if (src > 127)
 409                 return -EINVAL;
 410         if (qe_ic_info[src].pri_reg == 0)
 411                 return -EINVAL;
 412
 413         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);
 414
 415         if (priority < 4) {
 416                 temp &= ~(0x7 << (32 - priority * 3));
 417                 temp |= qe_ic_info[src].pri_code << (32 - priority * 3);
 418         } else {
 419                 temp &= ~(0x7 << (24 - priority * 3));
 420                 temp |= qe_ic_info[src].pri_code << (24 - priority * 3);
 421         }
 422
 423         qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);
 424
 425         return 0;
 426 }
 427
 428 /* Set a QE priority to use high irq, only priority 1~2 can use high irq */
 429 int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
 430 {
 431         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 432         unsigned int src = virq_to_hw(virq);
 433         u32 temp, control_reg = QEIC_CICNR, shift = 0;
 434
 435         if (priority > 2 || priority == 0)
 436                 return -EINVAL;
 437
 438         switch (qe_ic_info[src].pri_reg) {
 439         case QEIC_CIPZCC:
 440                 shift = CICNR_ZCC1T_SHIFT;
 441                 break;
 442         case QEIC_CIPWCC:
 443                 shift = CICNR_WCC1T_SHIFT;
 444                 break;
 445         case QEIC_CIPYCC:
 446                 shift = CICNR_YCC1T_SHIFT;
 447                 break;
 448         case QEIC_CIPXCC:
 449                 shift = CICNR_XCC1T_SHIFT;
 450                 break;
 451         case QEIC_CIPRTA:
 452                 shift = CRICR_RTA1T_SHIFT;
 453                 control_reg = QEIC_CRICR;
 454                 break;
 455         case QEIC_CIPRTB:
 456                 shift = CRICR_RTB1T_SHIFT;
 457                 control_reg = QEIC_CRICR;
 458                 break;
 459         default:
 460                 return -EINVAL;
 461         }
 462
 463         shift += (2 - priority) * 2;
 464         temp = qe_ic_read(qe_ic->regs, control_reg);
 465         temp &= ~(SIGNAL_MASK << shift);
 466         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
 467         qe_ic_write(qe_ic->regs, control_reg, temp);
 468
 469         return 0;
 470 }
 471
 472 static struct bus_type qe_ic_subsys = {
 473         .name = "qe_ic",
 474         .dev_name = "qe_ic",
 475 };
 476
 477 static struct device device_qe_ic = {
 478         .id = 0,
 479         .bus = &qe_ic_subsys,
 480 };
 481
 482 static int __init init_qe_ic_sysfs(void)
 483 {
 484         int rc;
 485
 486         printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");
 487
 488         rc = subsys_system_register(&qe_ic_subsys, NULL);
 489         if (rc) {
 490                 printk(KERN_ERR "Failed registering qe_ic sys class\n");
 491                 return -ENODEV;
 492         }
 493         rc = device_register(&device_qe_ic);
 494         if (rc) {
 495                 printk(KERN_ERR "Failed registering qe_ic sys device\n");
 496                 return -ENODEV;
 497         }
 498         return 0;
 499 }
 500
 501 subsys_initcall(init_qe_ic_sysfs);