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