arch/mips/mti-malta/malta-int.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Carsten Langgaard, carstenl@mips.com
   7  * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
   8  * Copyright (C) 2001 Ralf Baechle
   9  * Copyright (C) 2013 Imagination Technologies Ltd.
  10  *
  11  * Routines for generic manipulation of the interrupts found on the MIPS
  12  * Malta board. The interrupt controller is located in the South Bridge
  13  * a PIIX4 device with two internal 82C95 interrupt controllers.
  14  */
  15 #include <linux/init.h>
  16 #include <linux/irq.h>
  17 #include <linux/sched.h>
  18 #include <linux/smp.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21 #include <linux/irqchip/mips-gic.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/kernel.h>
  24 #include <linux/random.h>
  25
  26 #include <asm/traps.h>
  27 #include <asm/i8259.h>
  28 #include <asm/irq_cpu.h>
  29 #include <asm/irq_regs.h>
  30 #include <asm/mips-cm.h>
  31 #include <asm/mips-boards/malta.h>
  32 #include <asm/mips-boards/maltaint.h>
  33 #include <asm/gt64120.h>
  34 #include <asm/mips-boards/generic.h>
  35 #include <asm/mips-boards/msc01_pci.h>
  36 #include <asm/msc01_ic.h>
  37 #include <asm/setup.h>
  38 #include <asm/rtlx.h>
  39
  40 static void __iomem *_msc01_biu_base;
  41
  42 static DEFINE_RAW_SPINLOCK(mips_irq_lock);
  43
  44 static inline int mips_pcibios_iack(void)
  45 {
  46         int irq;
  47
  48         /*
  49          * Determine highest priority pending interrupt by performing
  50          * a PCI Interrupt Acknowledge cycle.
  51          */
  52         switch (mips_revision_sconid) {
  53         case MIPS_REVISION_SCON_SOCIT:
  54         case MIPS_REVISION_SCON_ROCIT:
  55         case MIPS_REVISION_SCON_SOCITSC:
  56         case MIPS_REVISION_SCON_SOCITSCP:
  57                 MSC_READ(MSC01_PCI_IACK, irq);
  58                 irq &= 0xff;
  59                 break;
  60         case MIPS_REVISION_SCON_GT64120:
  61                 irq = GT_READ(GT_PCI0_IACK_OFS);
  62                 irq &= 0xff;
  63                 break;
  64         case MIPS_REVISION_SCON_BONITO:
  65                 /* The following will generate a PCI IACK cycle on the
  66                  * Bonito controller. It's a little bit kludgy, but it
  67                  * was the easiest way to implement it in hardware at
  68                  * the given time.
  69                  */
  70                 BONITO_PCIMAP_CFG = 0x20000;
  71
  72                 /* Flush Bonito register block */
  73                 (void) BONITO_PCIMAP_CFG;
  74                 iob();    /* sync */
  75
  76                 irq = __raw_readl((u32 *)_pcictrl_bonito_pcicfg);
  77                 iob();    /* sync */
  78                 irq &= 0xff;
  79                 BONITO_PCIMAP_CFG = 0;
  80                 break;
  81         default:
  82                 pr_emerg("Unknown system controller.\n");
  83                 return -1;
  84         }
  85         return irq;
  86 }
  87
  88 static inline int get_int(void)
  89 {
  90         unsigned long flags;
  91         int irq;
  92         raw_spin_lock_irqsave(&mips_irq_lock, flags);
  93
  94         irq = mips_pcibios_iack();
  95
  96         /*
  97          * The only way we can decide if an interrupt is spurious
  98          * is by checking the 8259 registers.  This needs a spinlock
  99          * on an SMP system,  so leave it up to the generic code...
 100          */
 101
 102         raw_spin_unlock_irqrestore(&mips_irq_lock, flags);
 103
 104         return irq;
 105 }
 106
 107 static void malta_hw0_irqdispatch(void)
 108 {
 109         int irq;
 110
 111         irq = get_int();
 112         if (irq < 0) {
 113                 /* interrupt has already been cleared */
 114                 return;
 115         }
 116
 117         do_IRQ(MALTA_INT_BASE + irq);
 118
 119 #ifdef CONFIG_MIPS_VPE_APSP_API_MT
 120         if (aprp_hook)
 121                 aprp_hook();
 122 #endif
 123 }
 124
 125 static irqreturn_t i8259_handler(int irq, void *dev_id)
 126 {
 127         malta_hw0_irqdispatch();
 128         return IRQ_HANDLED;
 129 }
 130
 131 static void corehi_irqdispatch(void)
 132 {
 133         unsigned int intedge, intsteer, pcicmd, pcibadaddr;
 134         unsigned int pcimstat, intisr, inten, intpol;
 135         unsigned int intrcause, datalo, datahi;
 136         struct pt_regs *regs = get_irq_regs();
 137
 138         pr_emerg("CoreHI interrupt, shouldn't happen, we die here!\n");
 139         pr_emerg("epc    : %08lx\nStatus: %08lx\n"
 140                  "Cause : %08lx\nbadVaddr : %08lx\n",
 141                  regs->cp0_epc, regs->cp0_status,
 142                  regs->cp0_cause, regs->cp0_badvaddr);
 143
 144         /* Read all the registers and then print them as there is a
 145            problem with interspersed printk's upsetting the Bonito controller.
 146            Do it for the others too.
 147         */
 148
 149         switch (mips_revision_sconid) {
 150         case MIPS_REVISION_SCON_SOCIT:
 151         case MIPS_REVISION_SCON_ROCIT:
 152         case MIPS_REVISION_SCON_SOCITSC:
 153         case MIPS_REVISION_SCON_SOCITSCP:
 154                 ll_msc_irq();
 155                 break;
 156         case MIPS_REVISION_SCON_GT64120:
 157                 intrcause = GT_READ(GT_INTRCAUSE_OFS);
 158                 datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
 159                 datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
 160                 pr_emerg("GT_INTRCAUSE = %08x\n", intrcause);
 161                 pr_emerg("GT_CPUERR_ADDR = %02x%08x\n",
 162                                 datahi, datalo);
 163                 break;
 164         case MIPS_REVISION_SCON_BONITO:
 165                 pcibadaddr = BONITO_PCIBADADDR;
 166                 pcimstat = BONITO_PCIMSTAT;
 167                 intisr = BONITO_INTISR;
 168                 inten = BONITO_INTEN;
 169                 intpol = BONITO_INTPOL;
 170                 intedge = BONITO_INTEDGE;
 171                 intsteer = BONITO_INTSTEER;
 172                 pcicmd = BONITO_PCICMD;
 173                 pr_emerg("BONITO_INTISR = %08x\n", intisr);
 174                 pr_emerg("BONITO_INTEN = %08x\n", inten);
 175                 pr_emerg("BONITO_INTPOL = %08x\n", intpol);
 176                 pr_emerg("BONITO_INTEDGE = %08x\n", intedge);
 177                 pr_emerg("BONITO_INTSTEER = %08x\n", intsteer);
 178                 pr_emerg("BONITO_PCICMD = %08x\n", pcicmd);
 179                 pr_emerg("BONITO_PCIBADADDR = %08x\n", pcibadaddr);
 180                 pr_emerg("BONITO_PCIMSTAT = %08x\n", pcimstat);
 181                 break;
 182         }
 183
 184         die("CoreHi interrupt", regs);
 185 }
 186
 187 static irqreturn_t corehi_handler(int irq, void *dev_id)
 188 {
 189         corehi_irqdispatch();
 190         return IRQ_HANDLED;
 191 }
 192
 193 #ifdef CONFIG_MIPS_MT_SMP
 194
 195 #define MIPS_CPU_IPI_RESCHED_IRQ 0      /* SW int 0 for resched */
 196 #define C_RESCHED C_SW0
 197 #define MIPS_CPU_IPI_CALL_IRQ 1         /* SW int 1 for resched */
 198 #define C_CALL C_SW1
 199 static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
 200
 201 static void ipi_resched_dispatch(void)
 202 {
 203         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
 204 }
 205
 206 static void ipi_call_dispatch(void)
 207 {
 208         do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
 209 }
 210
 211 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
 212 {
 213 #ifdef CONFIG_MIPS_VPE_APSP_API_CMP
 214         if (aprp_hook)
 215                 aprp_hook();
 216 #endif
 217
 218         scheduler_ipi();
 219
 220         return IRQ_HANDLED;
 221 }
 222
 223 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
 224 {
 225         generic_smp_call_function_interrupt();
 226
 227         return IRQ_HANDLED;
 228 }
 229
 230 static struct irqaction irq_resched = {
 231         .handler        = ipi_resched_interrupt,
 232         .flags          = IRQF_PERCPU,
 233         .name           = "IPI_resched"
 234 };
 235
 236 static struct irqaction irq_call = {
 237         .handler        = ipi_call_interrupt,
 238         .flags          = IRQF_PERCPU,
 239         .name           = "IPI_call"
 240 };
 241 #endif /* CONFIG_MIPS_MT_SMP */
 242
 243 static struct irqaction i8259irq = {
 244         .handler = i8259_handler,
 245         .name = "XT-PIC cascade",
 246         .flags = IRQF_NO_THREAD,
 247 };
 248
 249 static struct irqaction corehi_irqaction = {
 250         .handler = corehi_handler,
 251         .name = "CoreHi",
 252         .flags = IRQF_NO_THREAD,
 253 };
 254
 255 static msc_irqmap_t msc_irqmap[] __initdata = {
 256         {MSC01C_INT_TMR,                MSC01_IRQ_EDGE, 0},
 257         {MSC01C_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 258 };
 259 static int msc_nr_irqs __initdata = ARRAY_SIZE(msc_irqmap);
 260
 261 static msc_irqmap_t msc_eicirqmap[] __initdata = {
 262         {MSC01E_INT_SW0,                MSC01_IRQ_LEVEL, 0},
 263         {MSC01E_INT_SW1,                MSC01_IRQ_LEVEL, 0},
 264         {MSC01E_INT_I8259A,             MSC01_IRQ_LEVEL, 0},
 265         {MSC01E_INT_SMI,                MSC01_IRQ_LEVEL, 0},
 266         {MSC01E_INT_COREHI,             MSC01_IRQ_LEVEL, 0},
 267         {MSC01E_INT_CORELO,             MSC01_IRQ_LEVEL, 0},
 268         {MSC01E_INT_TMR,                MSC01_IRQ_EDGE, 0},
 269         {MSC01E_INT_PCI,                MSC01_IRQ_LEVEL, 0},
 270         {MSC01E_INT_PERFCTR,            MSC01_IRQ_LEVEL, 0},
 271         {MSC01E_INT_CPUCTR,             MSC01_IRQ_LEVEL, 0}
 272 };
 273
 274 static int msc_nr_eicirqs __initdata = ARRAY_SIZE(msc_eicirqmap);
 275
 276 void __init arch_init_ipiirq(int irq, struct irqaction *action)
 277 {
 278         setup_irq(irq, action);
 279         irq_set_handler(irq, handle_percpu_irq);
 280 }
 281
 282 void __init arch_init_irq(void)
 283 {
 284         int corehi_irq, i8259_irq;
 285
 286         init_i8259_irqs();
 287
 288         if (!cpu_has_veic)
 289                 mips_cpu_irq_init();
 290
 291         if (mips_cm_present()) {
 292                 write_gcr_gic_base(GIC_BASE_ADDR | CM_GCR_GIC_BASE_GICEN_MSK);
 293                 gic_present = 1;
 294         } else {
 295                 if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
 296                         _msc01_biu_base = ioremap_nocache(MSC01_BIU_REG_BASE,
 297                                                 MSC01_BIU_ADDRSPACE_SZ);
 298                         gic_present =
 299                           (__raw_readl(_msc01_biu_base + MSC01_SC_CFG_OFS) &
 300                            MSC01_SC_CFG_GICPRES_MSK) >>
 301                           MSC01_SC_CFG_GICPRES_SHF;
 302                 }
 303         }
 304         if (gic_present)
 305                 pr_debug("GIC present\n");
 306
 307         switch (mips_revision_sconid) {
 308         case MIPS_REVISION_SCON_SOCIT:
 309         case MIPS_REVISION_SCON_ROCIT:
 310                 if (cpu_has_veic)
 311                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 312                                         MSC01E_INT_BASE, msc_eicirqmap,
 313                                         msc_nr_eicirqs);
 314                 else
 315                         init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
 316                                         MSC01C_INT_BASE, msc_irqmap,
 317                                         msc_nr_irqs);
 318                 break;
 319
 320         case MIPS_REVISION_SCON_SOCITSC:
 321         case MIPS_REVISION_SCON_SOCITSCP:
 322                 if (cpu_has_veic)
 323                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 324                                         MSC01E_INT_BASE, msc_eicirqmap,
 325                                         msc_nr_eicirqs);
 326                 else
 327                         init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
 328                                         MSC01C_INT_BASE, msc_irqmap,
 329                                         msc_nr_irqs);
 330         }
 331
 332         if (gic_present) {
 333                 int i;
 334
 335                 gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, MIPSCPU_INT_GIC,
 336                          MIPS_GIC_IRQ_BASE);
 337                 if (!mips_cm_present()) {
 338                         /* Enable the GIC */
 339                         i = __raw_readl(_msc01_biu_base + MSC01_SC_CFG_OFS);
 340                         __raw_writel(i | (0x1 << MSC01_SC_CFG_GICENA_SHF),
 341                                  _msc01_biu_base + MSC01_SC_CFG_OFS);
 342                         pr_debug("GIC Enabled\n");
 343                 }
 344                 i8259_irq = MIPS_GIC_IRQ_BASE + GIC_INT_I8259A;
 345                 corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
 346         } else {
 347 #if defined(CONFIG_MIPS_MT_SMP)
 348                 /* set up ipi interrupts */
 349                 if (cpu_has_veic) {
 350                         set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
 351                         set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
 352                         cpu_ipi_resched_irq = MSC01E_INT_SW0;
 353                         cpu_ipi_call_irq = MSC01E_INT_SW1;
 354                 } else {
 355                         cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE +
 356                                 MIPS_CPU_IPI_RESCHED_IRQ;
 357                         cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE +
 358                                 MIPS_CPU_IPI_CALL_IRQ;
 359                 }
 360                 arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
 361                 arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);
 362 #endif
 363                 if (cpu_has_veic) {
 364                         set_vi_handler(MSC01E_INT_I8259A,
 365                                        malta_hw0_irqdispatch);
 366                         set_vi_handler(MSC01E_INT_COREHI,
 367                                        corehi_irqdispatch);
 368                         i8259_irq = MSC01E_INT_BASE + MSC01E_INT_I8259A;
 369                         corehi_irq = MSC01E_INT_BASE + MSC01E_INT_COREHI;
 370                 } else {
 371                         i8259_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_I8259A;
 372                         corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
 373                 }
 374         }
 375
 376         setup_irq(i8259_irq, &i8259irq);
 377         setup_irq(corehi_irq, &corehi_irqaction);
 378 }
 379
 380 void malta_be_init(void)
 381 {
 382         /* Could change CM error mask register. */
 383 }
 384
 385 int malta_be_handler(struct pt_regs *regs, int is_fixup)
 386 {
 387         /* This duplicates the handling in do_be which seems wrong */
 388         int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
 389
 390         mips_cm_error_report();
 391
 392         return retval;
 393 }