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/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 int qe_ic_host_xlate(struct irq_domain *h, struct device_node *ct,
 276                             const 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_domain_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 __init qe_ic_init(struct device_node *node, unsigned int flags,
 327                 void (*low_handler)(unsigned int irq, struct irq_desc *desc),
 328                 void (*high_handler)(unsigned int irq, struct irq_desc *desc))
 329 {
 330         struct qe_ic *qe_ic;
 331         struct resource res;
 332         u32 temp = 0, ret, high_active = 0;
 333
 334         ret = of_address_to_resource(node, 0, &res);
 335         if (ret)
 336                 return;
 337
 338         qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
 339         if (qe_ic == NULL)
 340                 return;
 341
 342         qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
 343                                                &qe_ic_host_ops, qe_ic);
 344         if (qe_ic->irqhost == NULL) {
 345                 kfree(qe_ic);
 346                 return;
 347         }
 348
 349         qe_ic->regs = ioremap(res.start, resource_size(&res));
 350
 351         qe_ic->hc_irq = qe_ic_irq_chip;
 352
 353         qe_ic->virq_high = irq_of_parse_and_map(node, 0);
 354         qe_ic->virq_low = irq_of_parse_and_map(node, 1);
 355
 356         if (qe_ic->virq_low == NO_IRQ) {
 357                 printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
 358                 kfree(qe_ic);
 359                 return;
 360         }
 361
 362         /* default priority scheme is grouped. If spread mode is    */
 363         /* required, configure cicr accordingly.                    */
 364         if (flags & QE_IC_SPREADMODE_GRP_W)
 365                 temp |= CICR_GWCC;
 366         if (flags & QE_IC_SPREADMODE_GRP_X)
 367                 temp |= CICR_GXCC;
 368         if (flags & QE_IC_SPREADMODE_GRP_Y)
 369                 temp |= CICR_GYCC;
 370         if (flags & QE_IC_SPREADMODE_GRP_Z)
 371                 temp |= CICR_GZCC;
 372         if (flags & QE_IC_SPREADMODE_GRP_RISCA)
 373                 temp |= CICR_GRTA;
 374         if (flags & QE_IC_SPREADMODE_GRP_RISCB)
 375                 temp |= CICR_GRTB;
 376
 377         /* choose destination signal for highest priority interrupt */
 378         if (flags & QE_IC_HIGH_SIGNAL) {
 379                 temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
 380                 high_active = 1;
 381         }
 382
 383         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 384
 385         irq_set_handler_data(qe_ic->virq_low, qe_ic);
 386         irq_set_chained_handler(qe_ic->virq_low, low_handler);
 387
 388         if (qe_ic->virq_high != NO_IRQ &&
 389                         qe_ic->virq_high != qe_ic->virq_low) {
 390                 irq_set_handler_data(qe_ic->virq_high, qe_ic);
 391                 irq_set_chained_handler(qe_ic->virq_high, high_handler);
 392         }
 393 }
 394
 395 void qe_ic_set_highest_priority(unsigned int virq, int high)
 396 {
 397         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 398         unsigned int src = virq_to_hw(virq);
 399         u32 temp = 0;
 400
 401         temp = qe_ic_read(qe_ic->regs, QEIC_CICR);
 402
 403         temp &= ~CICR_HP_MASK;
 404         temp |= src << CICR_HP_SHIFT;
 405
 406         temp &= ~CICR_HPIT_MASK;
 407         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;
 408
 409         qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
 410 }
 411
 412 /* Set Priority level within its group, from 1 to 8 */
 413 int qe_ic_set_priority(unsigned int virq, unsigned int priority)
 414 {
 415         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 416         unsigned int src = virq_to_hw(virq);
 417         u32 temp;
 418
 419         if (priority > 8 || priority == 0)
 420                 return -EINVAL;
 421         if (src > 127)
 422                 return -EINVAL;
 423         if (qe_ic_info[src].pri_reg == 0)
 424                 return -EINVAL;
 425
 426         temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);
 427
 428         if (priority < 4) {
 429                 temp &= ~(0x7 << (32 - priority * 3));
 430                 temp |= qe_ic_info[src].pri_code << (32 - priority * 3);
 431         } else {
 432                 temp &= ~(0x7 << (24 - priority * 3));
 433                 temp |= qe_ic_info[src].pri_code << (24 - priority * 3);
 434         }
 435
 436         qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);
 437
 438         return 0;
 439 }
 440
 441 /* Set a QE priority to use high irq, only priority 1~2 can use high irq */
 442 int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
 443 {
 444         struct qe_ic *qe_ic = qe_ic_from_irq(virq);
 445         unsigned int src = virq_to_hw(virq);
 446         u32 temp, control_reg = QEIC_CICNR, shift = 0;
 447
 448         if (priority > 2 || priority == 0)
 449                 return -EINVAL;
 450
 451         switch (qe_ic_info[src].pri_reg) {
 452         case QEIC_CIPZCC:
 453                 shift = CICNR_ZCC1T_SHIFT;
 454                 break;
 455         case QEIC_CIPWCC:
 456                 shift = CICNR_WCC1T_SHIFT;
 457                 break;
 458         case QEIC_CIPYCC:
 459                 shift = CICNR_YCC1T_SHIFT;
 460                 break;
 461         case QEIC_CIPXCC:
 462                 shift = CICNR_XCC1T_SHIFT;
 463                 break;
 464         case QEIC_CIPRTA:
 465                 shift = CRICR_RTA1T_SHIFT;
 466                 control_reg = QEIC_CRICR;
 467                 break;
 468         case QEIC_CIPRTB:
 469                 shift = CRICR_RTB1T_SHIFT;
 470                 control_reg = QEIC_CRICR;
 471                 break;
 472         default:
 473                 return -EINVAL;
 474         }
 475
 476         shift += (2 - priority) * 2;
 477         temp = qe_ic_read(qe_ic->regs, control_reg);
 478         temp &= ~(SIGNAL_MASK << shift);
 479         temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
 480         qe_ic_write(qe_ic->regs, control_reg, temp);
 481
 482         return 0;
 483 }
 484
 485 static struct bus_type qe_ic_subsys = {
 486         .name = "qe_ic",
 487         .dev_name = "qe_ic",
 488 };
 489
 490 static struct device device_qe_ic = {
 491         .id = 0,
 492         .bus = &qe_ic_subsys,
 493 };
 494
 495 static int __init init_qe_ic_sysfs(void)
 496 {
 497         int rc;
 498
 499         printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");
 500
 501         rc = subsys_system_register(&qe_ic_subsys, NULL);
 502         if (rc) {
 503                 printk(KERN_ERR "Failed registering qe_ic sys class\n");
 504                 return -ENODEV;
 505         }
 506         rc = device_register(&device_qe_ic);
 507         if (rc) {
 508                 printk(KERN_ERR "Failed registering qe_ic sys device\n");
 509                 return -ENODEV;
 510         }
 511         return 0;
 512 }
 513
 514 subsys_initcall(init_qe_ic_sysfs);