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 } 394