arch/mips/netlogic/common/irq.c

   1 /*
   2  * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
   3  * reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the NetLogic
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in
  19  *    the documentation and/or other materials provided with the
  20  *    distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/init.h>
  37 #include <linux/linkage.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/mm.h>
  40 #include <linux/slab.h>
  41 #include <linux/irq.h>
  42
  43 #include <linux/irqdomain.h>
  44 #include <linux/of_address.h>
  45 #include <linux/of_irq.h>
  46
  47 #include <asm/errno.h>
  48 #include <asm/signal.h>
  49 #include <asm/ptrace.h>
  50 #include <asm/mipsregs.h>
  51 #include <asm/thread_info.h>
  52
  53 #include <asm/netlogic/mips-extns.h>
  54 #include <asm/netlogic/interrupt.h>
  55 #include <asm/netlogic/haldefs.h>
  56 #include <asm/netlogic/common.h>
  57
  58 #if defined(CONFIG_CPU_XLP)
  59 #include <asm/netlogic/xlp-hal/iomap.h>
  60 #include <asm/netlogic/xlp-hal/xlp.h>
  61 #include <asm/netlogic/xlp-hal/pic.h>
  62 #elif defined(CONFIG_CPU_XLR)
  63 #include <asm/netlogic/xlr/iomap.h>
  64 #include <asm/netlogic/xlr/pic.h>
  65 #include <asm/netlogic/xlr/fmn.h>
  66 #else
  67 #error "Unknown CPU"
  68 #endif
  69
  70 #ifdef CONFIG_SMP
  71 #define SMP_IRQ_MASK    ((1ULL << IRQ_IPI_SMP_FUNCTION) | \
  72                                  (1ULL << IRQ_IPI_SMP_RESCHEDULE))
  73 #else
  74 #define SMP_IRQ_MASK    0
  75 #endif
  76 #define PERCPU_IRQ_MASK (SMP_IRQ_MASK | (1ull << IRQ_TIMER) | \
  77                                 (1ull << IRQ_FMN))
  78
  79 struct nlm_pic_irq {
  80         void    (*extra_ack)(struct irq_data *);
  81         struct  nlm_soc_info *node;
  82         int     picirq;
  83         int     irt;
  84         int     flags;
  85 };
  86
  87 static void xlp_pic_enable(struct irq_data *d)
  88 {
  89         unsigned long flags;
  90         struct nlm_pic_irq *pd = irq_data_get_irq_chip_data(d);
  91
  92         BUG_ON(!pd);
  93         spin_lock_irqsave(&pd->node->piclock, flags);
  94         nlm_pic_enable_irt(pd->node->picbase, pd->irt);
  95         spin_unlock_irqrestore(&pd->node->piclock, flags);
  96 }
  97
  98 static void xlp_pic_disable(struct irq_data *d)
  99 {
 100         struct nlm_pic_irq *pd = irq_data_get_irq_chip_data(d);
 101         unsigned long flags;
 102
 103         BUG_ON(!pd);
 104         spin_lock_irqsave(&pd->node->piclock, flags);
 105         nlm_pic_disable_irt(pd->node->picbase, pd->irt);
 106         spin_unlock_irqrestore(&pd->node->piclock, flags);
 107 }
 108
 109 static void xlp_pic_mask_ack(struct irq_data *d)
 110 {
 111         struct nlm_pic_irq *pd = irq_data_get_irq_chip_data(d);
 112
 113         clear_c0_eimr(pd->picirq);
 114         ack_c0_eirr(pd->picirq);
 115 }
 116
 117 static void xlp_pic_unmask(struct irq_data *d)
 118 {
 119         struct nlm_pic_irq *pd = irq_data_get_irq_chip_data(d);
 120
 121         BUG_ON(!pd);
 122
 123         if (pd->extra_ack)
 124                 pd->extra_ack(d);
 125
 126         /* re-enable the intr on this cpu */
 127         set_c0_eimr(pd->picirq);
 128
 129         /* Ack is a single write, no need to lock */
 130         nlm_pic_ack(pd->node->picbase, pd->irt);
 131 }
 132
 133 static struct irq_chip xlp_pic = {
 134         .name           = "XLP-PIC",
 135         .irq_enable     = xlp_pic_enable,
 136         .irq_disable    = xlp_pic_disable,
 137         .irq_mask_ack   = xlp_pic_mask_ack,
 138         .irq_unmask     = xlp_pic_unmask,
 139 };
 140
 141 static void cpuintr_disable(struct irq_data *d)
 142 {
 143         clear_c0_eimr(d->irq);
 144 }
 145
 146 static void cpuintr_enable(struct irq_data *d)
 147 {
 148         set_c0_eimr(d->irq);
 149 }
 150
 151 static void cpuintr_ack(struct irq_data *d)
 152 {
 153         ack_c0_eirr(d->irq);
 154 }
 155
 156 /*
 157  * Chip definition for CPU originated interrupts(timer, msg) and
 158  * IPIs
 159  */
 160 struct irq_chip nlm_cpu_intr = {
 161         .name           = "XLP-CPU-INTR",
 162         .irq_enable     = cpuintr_enable,
 163         .irq_disable    = cpuintr_disable,
 164         .irq_mask       = cpuintr_disable,
 165         .irq_ack        = cpuintr_ack,
 166         .irq_eoi        = cpuintr_enable,
 167 };
 168
 169 static void __init nlm_init_percpu_irqs(void)
 170 {
 171         int i;
 172
 173         for (i = 0; i < PIC_IRT_FIRST_IRQ; i++)
 174                 irq_set_chip_and_handler(i, &nlm_cpu_intr, handle_percpu_irq);
 175 #ifdef CONFIG_SMP
 176         irq_set_chip_and_handler(IRQ_IPI_SMP_FUNCTION, &nlm_cpu_intr,
 177                          nlm_smp_function_ipi_handler);
 178         irq_set_chip_and_handler(IRQ_IPI_SMP_RESCHEDULE, &nlm_cpu_intr,
 179                          nlm_smp_resched_ipi_handler);
 180 #endif
 181 }
 182
 183
 184 void nlm_setup_pic_irq(int node, int picirq, int irq, int irt)
 185 {
 186         struct nlm_pic_irq *pic_data;
 187         int xirq;
 188
 189         xirq = nlm_irq_to_xirq(node, irq);
 190         pic_data = kzalloc(sizeof(*pic_data), GFP_KERNEL);
 191         BUG_ON(pic_data == NULL);
 192         pic_data->irt = irt;
 193         pic_data->picirq = picirq;
 194         pic_data->node = nlm_get_node(node);
 195         irq_set_chip_and_handler(xirq, &xlp_pic, handle_level_irq);
 196         irq_set_chip_data(xirq, pic_data);
 197 }
 198
 199 void nlm_set_pic_extra_ack(int node, int irq, void (*xack)(struct irq_data *))
 200 {
 201         struct nlm_pic_irq *pic_data;
 202         int xirq;
 203
 204         xirq = nlm_irq_to_xirq(node, irq);
 205         pic_data = irq_get_chip_data(xirq);
 206         if (WARN_ON(!pic_data))
 207                 return;
 208         pic_data->extra_ack = xack;
 209 }
 210
 211 static void nlm_init_node_irqs(int node)
 212 {
 213         struct nlm_soc_info *nodep;
 214         int i, irt;
 215
 216         pr_info("Init IRQ for node %d\n", node);
 217         nodep = nlm_get_node(node);
 218         nodep->irqmask = PERCPU_IRQ_MASK;
 219         for (i = PIC_IRT_FIRST_IRQ; i <= PIC_IRT_LAST_IRQ; i++) {
 220                 irt = nlm_irq_to_irt(i);
 221                 if (irt == -1)          /* unused irq */
 222                         continue;
 223                 nodep->irqmask |= 1ull << i;
 224                 if (irt == -2)          /* not a direct PIC irq */
 225                         continue;
 226
 227                 nlm_pic_init_irt(nodep->picbase, irt, i,
 228                                 node * nlm_threads_per_node(), 0);
 229                 nlm_setup_pic_irq(node, i, i, irt);
 230         }
 231 }
 232
 233 void nlm_smp_irq_init(int hwtid)
 234 {
 235         int cpu, node;
 236
 237         cpu = hwtid % nlm_threads_per_node();
 238         node = hwtid / nlm_threads_per_node();
 239
 240         if (cpu == 0 && node != 0)
 241                 nlm_init_node_irqs(node);
 242         write_c0_eimr(nlm_get_node(node)->irqmask);
 243 }
 244
 245 asmlinkage void plat_irq_dispatch(void)
 246 {
 247         uint64_t eirr;
 248         int i, node;
 249
 250         node = nlm_nodeid();
 251         eirr = read_c0_eirr_and_eimr();
 252         if (eirr == 0)
 253                 return;
 254
 255         i = __ffs64(eirr);
 256         /* per-CPU IRQs don't need translation */
 257         if (i < PIC_IRQ_BASE) {
 258                 do_IRQ(i);
 259                 return;
 260         }
 261
 262 #if defined(CONFIG_PCI_MSI) && defined(CONFIG_CPU_XLP)
 263         /* PCI interrupts need a second level dispatch for MSI bits */
 264         if (i >= PIC_PCIE_LINK_MSI_IRQ(0) && i <= PIC_PCIE_LINK_MSI_IRQ(3)) {
 265                 nlm_dispatch_msi(node, i);
 266                 return;
 267         }
 268         if (i >= PIC_PCIE_MSIX_IRQ(0) && i <= PIC_PCIE_MSIX_IRQ(3)) {
 269                 nlm_dispatch_msix(node, i);
 270                 return;
 271         }
 272
 273 #endif
 274         /* top level irq handling */
 275         do_IRQ(nlm_irq_to_xirq(node, i));
 276 }
 277
 278 #ifdef CONFIG_CPU_XLP
 279 static const struct irq_domain_ops xlp_pic_irq_domain_ops = {
 280         .xlate = irq_domain_xlate_onetwocell,
 281 };
 282
 283 static int __init xlp_of_pic_init(struct device_node *node,
 284                                         struct device_node *parent)
 285 {
 286         const int n_picirqs = PIC_IRT_LAST_IRQ - PIC_IRQ_BASE + 1;
 287         struct irq_domain *xlp_pic_domain;
 288         struct resource res;
 289         int socid, ret, bus;
 290
 291         /* we need a hack to get the PIC's SoC chip id */
 292         ret = of_address_to_resource(node, 0, &res);
 293         if (ret < 0) {
 294                 pr_err("PIC %s: reg property not found!\n", node->name);
 295                 return -EINVAL;
 296         }
 297
 298         if (cpu_is_xlp9xx()) {
 299                 bus = (res.start >> 20) & 0xf;
 300                 for (socid = 0; socid < NLM_NR_NODES; socid++) {
 301                         if (!nlm_node_present(socid))
 302                                 continue;
 303                         if (nlm_get_node(socid)->socbus == bus)
 304                                 break;
 305                 }
 306                 if (socid == NLM_NR_NODES) {
 307                         pr_err("PIC %s: Node mapping for bus %d not found!\n",
 308                                         node->name, bus);
 309                         return -EINVAL;
 310                 }
 311         } else {
 312                 socid = (res.start >> 18) & 0x3;
 313                 if (!nlm_node_present(socid)) {
 314                         pr_err("PIC %s: node %d does not exist!\n",
 315                                                         node->name, socid);
 316                         return -EINVAL;
 317                 }
 318         }
 319
 320         if (!nlm_node_present(socid)) {
 321                 pr_err("PIC %s: node %d does not exist!\n", node->name, socid);
 322                 return -EINVAL;
 323         }
 324
 325         xlp_pic_domain = irq_domain_add_legacy(node, n_picirqs,
 326                 nlm_irq_to_xirq(socid, PIC_IRQ_BASE), PIC_IRQ_BASE,
 327                 &xlp_pic_irq_domain_ops, NULL);
 328         if (xlp_pic_domain == NULL) {
 329                 pr_err("PIC %s: Creating legacy domain failed!\n", node->name);
 330                 return -EINVAL;
 331         }
 332         pr_info("Node %d: IRQ domain created for PIC@%pR\n", socid, &res);
 333         return 0;
 334 }
 335
 336 static struct of_device_id __initdata xlp_pic_irq_ids[] = {
 337         { .compatible = "netlogic,xlp-pic", .data = xlp_of_pic_init },
 338         {},
 339 };
 340 #endif
 341
 342 void __init arch_init_irq(void)
 343 {
 344         /* Initialize the irq descriptors */
 345         nlm_init_percpu_irqs();
 346         nlm_init_node_irqs(0);
 347         write_c0_eimr(nlm_current_node()->irqmask);
 348 #if defined(CONFIG_CPU_XLR)
 349         nlm_setup_fmn_irq();
 350 #endif
 351 #ifdef CONFIG_CPU_XLP
 352         of_irq_init(xlp_pic_irq_ids);
 353 #endif
 354 }